American Scientific Research Journal for Engineering, Technology, and Sciences

Online ISSN: 2313-4410
Publications
Article
In the present work, ferrites with compositions of Ni 0.60 Zn 0.40-x Re x Fe2O4 where x=0.05, 0.10, 0.15 were prepared by conventional Solid State Reaction Method. The samples were pre sintered at 1000 0 C for 4 hours in air and sintered at 1250 0 C for 3 hours. The influence of Lanthanum (la) substitution on various properties of Ni-Zn ferrites have been studied in this work. Investigations were carried out by the measurements of AC resistivity, Permeability and Curie temperature of the sample. AC resistivity has been found to be decreased of the samples. The initial magnetic permeability remains constant up to 10 MHz thenceforth sharply fall to very low values at higher frequencies and again remain constant from 9 MHz to 120 MHz and onward due to Zn deficient of Ni-Zn ferrites with substituting of La. The sharp directress of permeability at T = T c indicates the samples good homogeneity. The T C is found to increase with increasing Zn-deficient by substituting rare earth metal lanthanum (La).
 
Article
The following will be the design mechanism of the transimpedance amplifier and the RF resistor feedback, as well as how it is performed using the 0.35μm CMOS technique. The NMOS transistor has been placed from the conventional transimpedance amplifier as an active feedback contractor. We apply 3.3V voltage and 0.5μA photocurrent works in a circuit. The transimpedance amplifier is proposed after noise reduction, thus quantitating the larger dynamic range and in same time large gain. The simulation work of the transimpedance gain results in both of the single-phase and three-phase transimpedance amplifiers at the voltage gate which is 4.43 cubic meters and 4.39 cubic meters. Then the one-phase power dissipation and three-phase transimpedance amplifier is 602.04 μW and 1.781mW in the voltage gate of 2.0V [1,2].
 
Article
Volatility in financial markets has attracted growing attention by academics, policy makers and practitioners during the past two decades. First, volatility receives a great deal of concern from policy makers and financial market participants because it can be used as a measurement of risk. Second, High volatility of return in financial market may discourage investors to invest in stock market and hence greater uncertainty. So we need to estimate the appropriate volatility model to capture the volatility. In this paper, we study the performance of simple GARCH model. We apply the Generalized Autoregressive Conditional Heteroscedasticity (GARCH) model of different lag order to model volatility of stock returns of four Bangladeshi Companies on Dhaka Stock Exchange (DSE). Akaike Information Criteria (AIC) and Bayesian Information Criteria (BIC) are used to select the best GARCH(p,q) model. From the empirical results, it is found that the distribution of daily returns are non-normal with negative skewness and pronounced excess kurtosis. Result shows that, GARCH(1,1) is the best than other GARCH(p,q) models in modeling volatility for the daily return series of DSE.
 
Article
In this article some aspects o f the essence and content o f the aesthetic component in design are considered.
 
Article
The current research attempts to highlight the relationship between self-esteem, empathy dimensions, bullying and victimization. It is a quantitative, descriptive-correlative study that used self-report measures with a sample of 117 Albanian 12 to 16 year old youths. Respondents were randomly selected. The Adolescents Peer Relations Instrument of Parada presented in 2000, The Empathy Questionnaire for Children and Adolescents developed by Rieffe known since 2010, and the Rosenberg Self-Esteem Inventory of Rosenberg that dates back in 1965 were applied to the sample of this study. Socio-demographic data like sex, age, and birth order were analyzed as well. A Spearman (rho) correlation was performed after checking for normal distribution. A set of hierarchical multiple regressions were also performed to assess if, empathy dimensions, and self-esteem could predict bullying, and victimization behaviors, after controlling for sex, and age effects. Findings showed that most of the variables have relatively strong to very strong positive and negative relationships among them. Self-esteem and empathy dimensions as measured by APRI can be used as predictors of bullying behaviors, but they are not good predictors of victimization subscales, since the amount of variance explained by them is inconsiderable.-117 The authors believe the research is important for several parallel reasons: (1) in the authors' knowledge it was not performed earlier in the Albanian culture, thus offering an original approach regarding these variables, (2) it may be valuable to counselors and social workers who work with children and adolescents in schools and / or other settings, and (3) though it is not a specific aim of the study it also brings an additional contribution regarding the adaption of the measures used here as they were not previously used by the Albanian researchers.
 
Some wild representatives of the genus Capra: A: C. ibex ; B: C. pyrenaica; C: C. falconeri ; D: C. 
Small Ituri Goats / Photo taken by Kabaka Joël. 
Article
Local goat (Capra hircus L. 1758) farming is of increasing economic interest in African households. It is an important and easily accessible source of animal protein and income for many poor families. It offers great development opportunities through its meat production, its hardiness and its good adaptation in all the edapho-eco-climatic conditions of Africa. This adaptation and modification that she experienced in this province during migration gave her a pure Iturian origin. The native Ituri goat is native to Ituri.-210 As in Niger, pastoral society, the goat occupies a privileged place. Its endurance to the climate, its sobriety compared to sheep and cattle, its prolificacy, its aptitude for long walks give it the respect of the Tuareg man who makes him an animal of choice. For the province of Ituri, the goat is considered a savings bank for poor families because it is easily mobilized to solve certain difficulties of the family. She remains and will remain a reporting animal for vulnerable families. During the post-conflict period of 2003, the goat was a source of income and a welding animal for several families in that province; from goat, herds of cattle were restored just after the looting orchestrated by the succession of multiple wars in this country; all the cattle had been looted by the aggressors coming from neighboring countries.
 
Article
Evidences provided by empirical studies indicated that species respond towards globally changing climate and most significantly butterflies attain range expansion towards climatically suitable range boundaries. The range expansion of an Indian native butterfly Acraea terpsicore has been documented in Borneo and can be considered as a potential case of range expansion resulting from anthropogenic induced climate change. Since its rapid southward range expansion to the Southeast Asian region during the past 30 years, this species has expanded approximately over 7000 km 2. The rate of colonisation in this region was estimated approximately 200 km/ year and as for Borneo it was calculated as 100 Km/year. The spatial distribution of A. terpsicore in Borneo was calculated by EOO (extent of occurrence) and the range margins of its occurrence was measured to over an area of about 322766 km 2. With the help of bioclimatic niche models, current habitable climatic range and potential future range margins until 2050 were projected by consensus forecasts. The projections for potentially promising climatic regions (until 2050) suggested that the exponential range expansion of A. terpsicore will likely to occur further towards the SouthEastern areas of Taiwan, Philippines and Sulawesi Island.-169 In Borneo, this non-native species has also been keeping the track of its native land host plant and founded to feed on Passiflora foetida. Though for invasive species the distribution modelling does not provide a perfect picture of range expansion prediction in a novel range, due to landscape-climate differentiation, species biotic interactions, evolutionary adaptations and dispersal ability. So far, it is still considered a significant contributor in sketching of the climatically promising ranges for species with invasion potential.
 
Article
Ituri has long been considered the "cradle" of domestic animal husbandry in the Democratic Republic of Congo. It has a mild climate and favourable soil for animal production, which is why a research station at the National Institute for Study and Agricultural Research (INERA) was set up in Nioka by the settlers in Mahagi territory, followed by a planting in Bunia of a large industrial Slaughterhouse, the second in Africa after that of Nigeria. The establishment of the Slaughterhouse was in order to facilitate the commercialization of meat in this region.
 
Article
The BM-179 uranium ore is the ore rock from Kalan that derived shaft 179 m at Ekoremaja Hill in Kalan-West-Kalimantan Indonesia that has uranium and sulphide minerals and mineral complex combinations. This study aims to identify of radiometric and mineragraphy analysis qualitatively against sulfide and uranium minerals at BM-179 Kalan-West-Kalimantan uranium ore. The method of research begins done by cutting 3-8 cm ore using a grandsaw cutlery, sample selection using the ROS (radiometric ore sorting) by SPP-NF and mineral identification using mineragraphy analysis (polishes method) through the use of mount press for microstructural analysis, polisher ecomet III grinder tool and reflectance microscopy. The results obtained are BM-179 Kalan uranium ore size 3-8 cm has radiometric less than 1000 cps as much as 75% by weight of the ore and has radiometric more than 1000 cps as much as 25% by weight of the ore. From the results of the identification of mineragraphy ore known that many uranium minerals contained in the ore by radiometric more than 1250 cps, while there are many sulfide minerals in the ore which has a radiometric less than 1250 cps. Qualitatively known that the sulfide content of up to 5 % contained at the BM-179 ore with radiometric 150-500 cps, and the highest uranium content reaches 3 % contained at the BM-179 ore with radiometric 5000-15000 cps.
 
Article
The present study is aimed at understanding how COVID-19 has impacted the digital transformation of businesses globally. The study considered numerous sub-aspects related to the digital transformation of businesses, including drivers to digital transformation, impact on people and society, and the impact of COVID-19. The research was based on the interpretivist paradigm using a qualitative research approach and interview method where data was collected from the C-suite category of selected businesses from Canada, India, Germany, Austria, and Switzerland. The study's results have identified COVID-19 as the most significant challenging factor for transforming businesses where lack of coherence among employees and inability of people to adapt to the technological interventions might demotivate them and cause disrupted operational activities of businesses. The study's results also suggested for businesses to focus on training and development of employees to capacitate them to adapt to the new normal working environment.
 
Article
Aiming to support a better understanding of the clothing retail trade scenario after the crisis of the new coronavirus (SARS-CoV-2: COVID-19) and the recovery of the Brazilian economy, it is presented the result of a descriptive exploratory research applied from June to September 2021 with 118 consumers located in Paraná Coast, in the Southern region of Brazil. The results showed that consumers were on average 29.06 years old with an average household income of USD 798.12, with women having a small greater margin in relation to the purchase of clothes when compared to men. The purchase preference among the interviewees was still for physical stores (n=51.95%), and among the factors that had greater relevance, the purchase of bespoke products was highlighted, eliminating the time-consuming exchanges of online shopping, the convenience of proximity to their homes and the possibility of trying on the desired pieces. The factors that hindered purchases were the small diversity of models and sizes of clothing, and in particular the issue of the price, which is considered high and constitutes a restrictive factor to retail trade in the region, and in a general context, the retail trade in Paraná Coast cannot satisfactorily meet the customers' wishes. Especially in this period of the economic recovery and the return to face-to-face work, after so many deaths of the Brazilian population, it is necessary to consider other influences, not only those originating from the marketing process, such as relationship marketing.
 
Article
This study reports students' perceptions of Emergency Remote Education (ERE) during Spring 2020 in Higher Education Institutions (HEIs) in the Sultanate of Oman. Online classes replaced face-to-face teaching in the middle of March 2020. Eleven thousand one hundred eighty-one students from different HEIs in the Sultanate of Oman participated in a national online questionnaire in July 2020. Students reported the availability of adequate infrastructure as a significant issue during ERE. Fewer than half (46%) participants owned laptops, while others shared laptops with other family members. Most students utilized mobile data; less than a quarter used Wi-Fi at home. Recorded PowerPoint lectures and live lectures were the most common teaching approaches. Students reported that faculties' use of YouTube videos and recording practical aspects in a laboratory/workshop setting deliver practical parts of the course. In this research, Humanities students have reported a positive experience with ERE; however, Engineering students were least satisfied with ERE. Moreover, students rated their perception of ERE as moderate in different areas (e.g., suitability of the online assessment, interactions between faculty and students, skills and knowledge gained, and quality of education). We recommend that government and HEI implement strategies, such as providing laptops and expanding Wi-Fi coverage, to address the challenges listed in the research. As online teaching is expected to continue, such measures are required to implement online classes effectively.
 
Percentage of Value Added Taxes to LAC Tax Structure a
Tourism as a Share in Total Exports
VAT Tax Collection Evolution in LAC Tax Administrations
Article
Appearing in early 2020, the Covid-19 pandemic has forced Latin American and Caribbean (LAC) countries to implement tax measures to support taxpayers and sustain tax revenue through the outbreak. Policy makers need to assess the implementation of these measures and future policies while considering current issues such as lack of fiscal space, shortage of economic flows, rushing digitalization and falling tax morale in the region. This contribution covers the current scenario in LAC and provides tax insights to be considered as the region moves forward after the crisis.
 
A mosaic of photos showing damages of Bagan pagodas due to earthquakes in history. Their tops are
(a) Satellite topographic map showing tectonic-geomorphic features in Myanmar and recent earthquake location. (b) Cross-section (A-B) along latitude 21°N in E-W direction through Myanmar showing surface profile, surface geology and configuration of India-Burma subduction zone.
Article
The 1975 M 6.8 Bagan earthquake occurred on 8 th July 1975, at 12:04:38 (UTC). The epicenter was at 21.50N 94.70E with the depth of 112 km (ISC) and focal mechanism is thrusting (USGS). The intensity of earthquake was severe which involved destruction of many pagodas with a loss of at least one live and one injury. Most of the pagodas were damaged with their tops falling down to the ground. Bagan, the land of temples and stupas was shaken by a series of earthquakes since ancient time and the earliest records are about 25 November,1372; 14 July 1485 A.D. and another event in 1550 A.D.by which event Shwe-gu-gyi temple was damaged. Although the 1975 earthquake was one of the significant earthquakes that have occurred along inland zone in the western Myanmar, this event has not been analyzed within the context of present-day understanding of earthquake seismology. The mode of deformation and seismic history of these earthquakes remain unresolved. Due to another large earthquake, Chauk earthquake in 2016 with M 6.8, approximate numbers of pagodas of (400) were damaged as the previous 1975 Bagan earthquake. Pagodas left intact and withstand as before. Geologists and earthquake engineers went to Bagan city and neighboring towns for damage assessment a few days after the 2016 Chauk earthquake event. People explained that the main shock was very powerful and the houses and religious building were lifted about 3 times at initial shaking and then lateral shaking continued for a minute. It is due to the ground motion that was strong enough to fling up the buildings as the fault rupture beneath it.-141 On the base of field investigation that was carried out to map the surface rupture associated with this earthquake event, the 1975 Bagan earthquake and 2016 Chauk earthquake are intermediate-depth subduction earthquakes and such inland intermediate-depth earthquakes are hazardous earthquakes for the area along the Rakhine Western Ranges (Indo-Andaman belt) under which the India plate is subducting beneath the Burma plate. These earthquakes are the most significant events that occurred in intra-plate subduction zone setting.
 
Article
This paper investigates the determinants of Sudan balance of payments using annual data on balance of payments (BOP), foreign debt (ED), exchange rate (EX), inflation (INF), gross domestic product (GDP) during the period (1980-2016). The paper elaborates the problem regarding the impact of foreign debt on the balance of payments. The paper built on the fundamental assumption that the foreign debt linked to a positive relationship with the balance of payments by running VECM Approach. Results of the study indicate that there is a direct correlation between the balance of payments and foreign debt, and an inverse relationship between the balance of payments and all of the inflation, gross domestic product and exchange rate during the forementioned period. The paper recommends that Sudan should not totally dependes on foreign aid in solving its economic problems which entails to transfer big amount of the national product to meet the commitments towards those foreign countries, the need for coordination between macroeconomic policies and domestic economic policies in order to increase output domestic product, economic policies are functioning to reduce the ratio of foreign debt and the reduction of inflation and bring about stability in the exchange rate which leads to improving the balance of payments to be adopted by Sudan.
 
Variables included, their description and sources 1980-2016
Article
This paper investigates the determinants of Sudan balance of payments using annual data on balance of payments (BOP), foreign debt (ED), exchange rate (EX), inflation (INF), gross domestic product (GDP) during the period (1980-2016). The paper elaborates the problem regarding the impact of foreign debt on the balance of payments. The paper built on the fundamental assumption that the foreign debt linked to a positive relationship with the balance of payments by running VECM Approach. Results of the study indicate that there is a direct correlation between the balance of payments and foreign debt, and an inverse relationship between the balance of payments and all of the inflation, gross domestic product and exchange rate during the forementioned period. The paper recommends that Sudan should not totally dependes on foreign aid in solving its economic problems which entails to transfer big amount of the national product to meet the commitments towards those foreign countries, the need for coordination between macroeconomic policies and domestic economic policies in order to increase output domestic product, economic policies are functioning to reduce the ratio of foreign debt and the reduction of inflation and bring about stability in the exchange rate which leads to improving the balance of payments to be adopted by Sudan.
 
Article
The study examined the characteristics of the Sumanpa stream’s Flow-Duration-Frequency Curve statistics for a period of 25years (1985-2009) and compared the 1990-1999 and 2000-2009 Flow-Duration-Curves. The high, low and mean Flow-Duration-Curves were also analysed. The discharge records were analysed to develop a general quantitative characterization of the stream’s flow variability. Streamflow data was generated from daily stage data using the rating curve model developed at the stream’s gauge station. Flow-Duration-FrequencyCurves were developed using the Weibull plotting position and used to analyse the catchment’s surface and groundwater storage and stream’s flow characteristics. The approach placed the midpoints of the moist, midrange, and dry zones of the curves at 25th, 50th, and 75th percentiles, respectively. The high zone was centered at the 5th percentile, while the low zone was centered at the 95th percentile. For 95% of the time, the streamflowequalled or exceeded 0.14 m3s-1, at 5% it equalled or exceeded 45 m3s-1 and at 50% flow equalled or exceeded 5.53 m3s-1.
 
Article
Sufficient tax collection seems less problematic in developed countries, whereas it is a hot topic in developing countries around the world because many developing countries have faced a number of constraints affecting their tax performance. This study explores determinants of tax-to-GDP ratio, which is an important indicator of tax performance in East Asia where rapid economic growth presents; meanwhile previous studies on tax performance are scant, in particular for developing countries in the region. In addition, this study utilizes the empirical results to construct tax effort index so as to shed light on tax capacity of the Lao PDR. The results indicate that per capita GDP and trade liberalization are statistically and positively correlated with tax-to-GDP ratio, whereas manufacturing share and age dependence rate are statistically negative effects on the ratio. This is surprising that economic structure variable (e.g., manufacturing share of GDP) turns to be statistically negative; this could mean that tax incentive policy resulted in unsuccessful outcome over the period. Moreover, tax effort index shows that it is less than unity, meaning that tax capacity of the country remains low and this has caused low level of tax collection in the country over the period.
 
Article
Sufficient tax collection seems less problematic in developed countries, whereas it is a hot topic in developing countries around the world because many developing countries have faced a number of constraints affecting their tax performance. This study explores determinants of tax-to-GDP ratio, which is an important indicator of tax performance in East Asia where rapid economic growth presents; meanwhile previous studies on tax performance are scant, in particular for developing countries in the region. In addition, this study utilizes the empirical results to construct tax effort index so as to shed light on tax capacity of the Lao PDR. The results indicate that per capita GDP and trade liberalization are statistically and positively correlated with tax-to-GDP ratio, whereas manufacturing share and age dependence rate are statistically negative effects on the ratio. This is surprising that economic structure variable (e.g., manufacturing share of GDP) turns to be statistically negative; this could mean that tax incentive policy resulted in unsuccessful outcome over the period. Moreover, tax effort index shows that it is less than unity, meaning that tax capacity of the country remains low and this has caused low level of tax collection in the country over the period.
 
Article
On Tuesday afternoon, 12 January 2010 at 16:53 local time, Haiti faced the most disastrous earthquake in its history since the 1842 Cap-Haïtien (north coast of Haiti) Earthquake. Occurred with a moment magnitude (M w) of 7.0, the 2010 Haiti earthquake devastated Port-au-Prince, Léogâne, and Jacmel. Despite some progress in rebuilding infrastructure, the high cost of living due, in particular, to political instability and unemployment forces people to rebuild in worse condition than before the 2010 earthquake. Based on an independent investigation and experience of the country's reality in the domain of construction, this paper highlights the main causes of the 2010 Haiti earthquake to alert the need for better rebuilding the country. Therefore, some suggestions are given to boost the construction practice in Haiti to circumvent the loss of life and property in future catastrophic events notably earthquakes.
 
NAI susceptibility of influenza viruses determined by the fluorescent NA inhibition assay 
Article
Emergence of resistant influenza virus progeny to currently approved antiviral drugs determines the need for antiviral susceptibility monitoring. The aim of the present study is to analyze neuraminidase inhibitor susceptibility of influenza viruses circulating in Bulgaria during the flu seasons. A phenotypic fluorescence-based assay with MUNANA substrate was conducted with 93 influenza A(H1N1)pdm09, A(H3N2) and type B isolates. Screening of 352 influenza A(H1N1)pdm09 viruses was carried out using a Real Time RT-PCR discrimination assay for detection of the H275Y oseltamivir resistance point mutation. Phenotypic (IC 50) evidence for resistance or reduced susceptibility to neuraminidase inhibitors was not found for any of the influenza A(H1N1)pdm09, A(H3N2) and type B viruses screened. Only one (0,3%) influenza A(H1N1)pdm09 virus carrying the H275Y substitution was detected. Real Time RT-PCR assay could be applied to screen large numbers of clinical A(H1N1)pdm09 influenza virus positive samples for oseltamivir resistance. The present study highlights the importance of continued influenza antiviral susceptibility monitoring in clinical specimens.
 
Article
The aim of this paper is to (1) Determine the proportion of people that are uninsured by race and gender (2) Explain the differences in coverage between gender and race classifications. Data from the US Census Bureau showing health insurance coverage by race and gender for years 2013 and 2014 was analyzed and showed that a higher proportion of males compared to females were uninsured. In addition, Hispanic males and females had the highest proportion of the uninsured, closely followed by Blacks. Whites had the lowest proportion of uninsured people of any race
 
Article
The paper begins with a brief review of the literature and how business students choose their major in the U.S. and we list the most popular majors in the U.S. Universities. We also talk about the factors that influenced student’s choice. In our next research project, we will not only use a larger sample size but also the sample will come from a few universities to reduce the sampling bias. In this paper, we also talk about changing trends in international students. We talk about the large group of Chinese, Indian, and Arabic students, and we show that with literature and graphical support. In the next section, we analyze one of the up and coming new business majors ―Business Analytics‖ We finish the paper with a discussion of growth of international students both at graduate and undergraduate level, and how we will address the shortcomings of this paper with our next project.
 
Article
American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS) ISSN (Print) 2313-4410, ISSN (Online) 2313-4402 © Global Society of Scientific Research and Researchers http://asrjetsjournal.org/ The 2019 M 3.4 Yangon Earthquake in Ayeyarwady Delta Basin Hla Hla Aung* Myanmar Earthquake Committee, Federation of Myanmar Engineering Societies, MES Building, Hlaing University Campus, Yangon Email: hhlaaung@gmail.com Abstract An earthquake of M 3.4 occurred in Yangon with epicenter at Dalah, 6 km SSE of Yangon at 15:24:18 pm (UTC) on 12th November, 2019. Its epicenter was situated at 16.751°N, 96.18°E and at depth 10 km (6.2 miles) (USGS, NEIC). It was a slight earthquake and vibration was severe and people felt strong shaking in almost every townships of the Yangon Region but no severe damages. The event was preceded by a loud sound and heavy shaking last 8 seconds. Ground deformation by this event is slanting of the high-rise buildings in some townships, liquefaction features like water seepage from underground to the surface and slight cracks on the wall of the buildings. The causative fault for the earthquake is believed to be a reverse fault with strike-slip component of the NNW-SSE trending Yangon fault. This is due to basin inversion in Ayeyawady Delta Basin. On 13th January 2013 an earthquake with the same magnitude occurred at 10 km depth. It was a slight earthquake and vibration was felt in several townships of Yangon. In 17 December, 1927, an earthquake with magnitude 7.0 hit Yangon and caused certain amount of damages. It was felt15,000 sq.km from Kyangin to Dedaye along the western slope of Bago Yoma. In Yangon, the shock was much severer causing widespread alarm and damage to concrete buildings. Focal mechanism solution of the 1927 event was a strike-slip faulting (USGS). In July, 1930 Bago earthquake with M=7.3 effected Yangon, vibration spread caused damage to the buildings and 500 persons in Bago and 50 persons were killed in Yangon respectively. The last record of significant earthquakes that struck Yangon is on 30th September,1978 with M 5.7 at 10 km depth. Keywords: vibration; reverse fault; strike-slip fault; liquefaction; deformation; basin inversion.
 
Article
In this study, the effect of simulation assisted instruction on attitude towards physics of adolescent students is explored. For this, the achievement scores in Physics of adolescent students who were taught using simulation assisted instruction and others who followed traditional lecture method were correlated separately using Pearson ‘r’ with the scores obtained by administering the physics attitude scale. The findings indicated that there is a positive significant correlation exists between the achievements in Physics of adolescent students exposed to simulation assisted instruction in their attitude towards Physics. This implies that the teachers may integrate simulation assisted instruction in their class room teaching so that their students enhance their positive attitude toward physics. As a result of this increase, students could have better accomplishments in the field of physics.
 
Chemical composition of C1, C2 and C3
a, b, c : Courbe d'évolution des Thermophiles et Mésophiles au cours du compostage 
ab: Content in calcium(a) and in magnesium(b) in the composts 
a et b: Content in sodium and in chlorine in the composts 
Article
A composting study of agro-food residues was conducted to evaluate the nutrient content of plants. Three types of composts were made: compost C 1 based on organic matter; compost C 2 based on organic matter and Tahoua rock phosphate and compost C 3 based on organic matter, cow manure and Tahoua rock phosphate. During composting, the pH reached 9.60; 8.93 and 8.88 respectively for composts C 1 , C 2 and C 3 before falling respectively to 9.15; 7.90 and 7.83 at the end of composting. The temperature reached 57 ° C for all composts during composting before stabilizing at 31 ° C after composting. The analysis of the physicochemical parameters of the composts obtained reveals that they contain carbon contents (23.01%, 14.625% and 16.575% for C 1 , C 2 and C 3 respectively) and nitrogen (2.63%; 34% and 1.62% for C 1 , C 2 and C 3 respectively) and C / N ratios (8.74, 10.91 and 10.83 for C 1 , C 2 and C 3 respectively) and nutrients: available phosphorus (186.2, 399.70, 695.8 mg / kg for C 1 , C 2 and C 3 respectively), potassium (3389.97, 1127; 1313.30 for C 1 , C 2 and C 3 respectively), calcium (12000, 42800, 64000 mg / kg for C 1 , C 2 and C 3 respectively) and magnesium (18936.77, 15946.62, 16346.47 mg / kg for C 1 , C 2 and C 3 respectively).
 
Article
Global construction industry for construction 3D printing(3DP) is a novel technique that has started since 3DP innovation in 1981 while still, this technique has undergone a challenge in Indonesia and Malaysia's construction industry. Applying 3DP in the construction industry has given various benefits more than the conventional construction way. The most witnessed challenges in this technology are printing material, print equipment, stakeholders, and suppliers. Moreover, the absence of standard codes and policies, structural solidity, and extensibility have been over and over referred to as the most critical issues facing the designers. This research introduces the qualitative analysis based on a questionnaire to evaluate the environmental aspects and then analyze it by applying the strategic planning technique SWOT matrix to help identify strengths, weaknesses, opportunities, and threats related to this aspect. This research attempted to investigate the environmental aspects of Construction by 3D Printing (C3DP) will be the trending technology in the next 10 years. The research also offers some future research ideas, insights, and recommendations.
 
Cutting parameters and regimes
Cutting regimes and measured values
Article
In this research is intended to investigate surface roughness parameters of material (St 52-3 according DIN standard) during milling process. For research are taken minimal and height parameters Ra, Rt and Rz, processing were conducted on CNC KNUTH X.mill 900 CNC drilling machine, while measurement were conducted with equipment TALYSURF for measurement of roughness parameters. The experiments were carried out on the samples (plates) of the materials mentioned above with dimensions L=20mm and a width b=60mm, while the roughness of the surface in this paper is experimentally presented with factors which have a more significant impact, and using the three-factor [2 3 + 4] plan.
 
The John Deere JD-5403 model tractor 
Model summary and parameter estimates for JD-5403
Article
The paper presents an approach for deriving a mathematical model that predict repair and maintenance (R&M) cost of farm tractors in The Gambia. As John Deere (JD) tractors are widely used by Gambian farmers, a study was conducted to predict accumulated repair & maintenance costs (Y) of the two-wheel drive (2WD) JD-5403 tractor based on accumulated working hours (X). In order to determine the mathematical model for the studied tractor, regression analysis using knowledge based analytical software (SPSS STATISTICS 21 and Excel 2016 version) was performed on the calculated data generating five regression models: linear, logarithmic, polynomial, power and exponential. The statistical results showed that the polynomial model gave better cost prediction with higher confidence and less variation than other models. Finally, it was established that repair and maintenance cost increased with an increase in working hours of JD-5403 tractor.
 
a) Utility and b) Revenue against number of episodes.
Article
It is envisioned that 5G systems will increasingly leverage on the network slicing concept to meet the demand of diverse services, each tailored for specific user requirements. In this context, slice admission algorithms that admit slices to the system, that optimize a given objective while ensuring the efficient allocation of resources, are required. Reinforcement learning has been used successfully to implement optimal slice admission policies. But as the 5G wireless network becomes more extensive and intricate, the state and action spaces become large. The efficiency and convergence of reinforcement learning slice admission algorithms is negatively impacted in such a scenario. To improve on this, deep reinforcement learning, a combination of reinforcement learning and deep learning, has been adopted. In this paper, a Deep Q-Learning slice admission algorithm is designed; to this end a utility, was developed. Results show that using the utility as a maximization objective enabled the designed algorithm to (i) optimize the infrastructure provider's revenue while (ii) providing queue management, in terms of queue length and queue delay.
 
Left Key performance indicator for the evolution from 4G to 5G. Right: The key 5G considerations to
A general 5G cellular network architecture [4]. (Image curtsey Akhil and his colleagues)
Article
The fifth generation of cellular mobile communication called 5G will be publicly available in the near future to connect more than 8.4 billion devices. 5G has been designed to improve the network capacity and speed significantly. Various providers and Android cell phone producers have contributed to this huge project and have successfully tested their networks and devices. Additionally, 5G is a revolutionizing technology in which smart devices, including Android phones, are capable of utilizing artificial intelligence software applications. In addition, other emerging technologies, including autonomous driving that rely highly on network communications, will be positively affected. The business aspect of 5G is also promising, as were the business aspects of the previous generations. 5G will be financially beneficial, as step by step, users will update their devices, or they will have to purchase a device that is compatible to 5G, which will produce a high financial turnover for the telecom companies. This review briefly addresses the technical background and 5G key technologies. In the second section, the cutting-edge development and state-of-the-art 5G related technologies will be discussed.
 
Article
5G remote frameworks will expand portable correspondence administrations past versatile communication, portable broadband, and huge machine-type correspondence into new application spaces, to be specific the purported vertical areas including the shrewd production line, keen vehicles, savvy matrix, brilliant city, and so on At last, our vision of 6G remote frameworks is talked about momentarily. The fuse of fifth-age organizations (5G) in a brilliant matrix would make novel plans of action of "edge" and "mist" innovation at the utility side, going with savvy control and robotization. Finally, the remarkable Job Based Admittance Control (RBAC) is fused with the Intellectual Radio piece of a sharp system correspondence association to guarantee against unapproved permission to customer's data and to the association running free. We additionally give a study of the connected exploration committed to mechanization in the upward spaces.
 
Plot of average cumulative revenue against number of episodes
Average slice admission rate for (a) Q-learning (b) Greedy and (c) Random
Q-Learning Algorithm
Article
Network slicing enables a 5G infrastructure provider (network infrastructure owner) to create multiple separate virtual networks, each tailored at a specific performance requirement, on a common physical network. In this context, slice admission algorithms are required to process slice requests received by the infrastructure provider. These algorithms are tailored to admit and allocate resources to network slices in a manner that results in the optimization of a given objective. In this paper, a Q-learning slice admission algorithm, which maximizes the infrastructure provider’s revenue, is designed. Results show that the designed algorithm learns from its environment, which enables it to acquire knowledge about the multi-tiered cellular network, thus allowing it make optimal slice admission decisions. The results further show that the designed algorithm has superior performance in terms of revenue achieved when compared to algorithms that admit, a) to maximize immediate rewards and b) slices in a random manner.
 
ButterWorth Van Dyke model
characteristics of resonators
Article
This paper provides information on the study of acoustic bulk wave filter technologies, the Harmonic Bulk Acoustic Wave Resonator (HBAR) and the Bulk Acoustic Wave Resonator (FBAR) and proposes a hybrid structure (HBAR-FBAR).) that would be a solution to overcome the disadvantage of HBAR technology manifested by an exaggerated occupation of harmonic frequencies around the resonant frequency when it used in the oscillators of mobile phone systems. The results show that hybrid technology is the best solution.
 
Article
Traditional Uvulectomy has been an age-long practice throughout Africa and certain parts of the Middle East. It is performed as a treatment to prevent throat infections for centuries and is carried out usually during infancy and childhood. Uvula is a fleshy projection hanging at the back of the throat from the posterior margin of the soft palate. Congenital absence of uvula has been observed to be associated with other congenital abnormalities such as cleft palate. This case report concerns a 26 year old male from Nigeria, examined at a health fair conducted at All Saints University School of Medicine in Dominica who on an incidental finding was diagnosed with neither the absence of uvula without any other abnormality nor a history of uvulectomy. To the best of our knowledge, we report the first case in medical literature of the congenital absence of uvula in a patient with no other known abnormalities.
 
Article
Fifteen crude oil samples were collected from different oil fields of the Kurdistan region, Northern Iraq to determine four trace metals, Fe, Ni, Cr and Pb. The analytical technique is applied mainly by flame atomic absorption spectrophotometry (ASS). Samples of these areas has not been previously examined for trace elements contents. API value of crude oils are inversely proportional to specific gravities and might be considered as a primary estimation for hydrocarbon contents. The relationship between trace metals and American Petroleum Institute (API) values of the samples are inversely proportional where the increasing API value of crude oil samples means a decrease in the metal contents of the samples. The method of dry ashing- acid dissolution (DA) was implemented. The results concluded that crude oil samples of the Kurdistan region have a low metal content. Nevertheless, they could be seen as an essential health hazard for humans and the environment. In t-Test ˂ for iron, chromium and lead, there is no relationship between these three heavy metals.
 
Physico-chemical properties of neem seed oil and neem seed oil Biodiesel (B100) and petroleum diesel
Article
The current challenges of fossil fuels have led to the need for alternative energy sources like biodiesel and biodiesel blends because they are renewable and environmentally friendly. The biodiesel production from neem seed involved, oil extraction, moisture/FFA reduction then base transesterification reaction using the extracted neem seed oil, methanol (6:1), 1.0% KOH at 60 o C, 400 rpm for 2 hrs. The physico-chemical and fuel properties of the neem seed oil biodiesel was analysed using standard analytical procedures, and the statistical data analysed using SPSS version 20.0. Most values were within the ASTM/EN standards, which can make a major contribution now and in the future by meeting the expected demand of petroleum diesel and providing improved properties of lower emission. As a result of this, it can be used in diesel engines and plants with little or no modification.
 
Article
The use of computers in virtually all aspects of human activities is rapidly expanding. Simplification of activities for both people and organizations alike, by the use of advanced technological procedures and search for various ways to make things easier is fast becoming a norm in this generation. The counselling world is no exception, as various Counselling Support Systems (CSS) can now be found online to provide quality counselling to people via the Internet. In developing countries, the prevalence of drug abusers, lack of adequate counselling professionals, loss/mismanagement of sensitive client records and the un-professional nature of counsellors are some of the reasons why the design of a Counselling Support System (CSS) was designed. In order to achieve all set objectives and fulfil requirements, the Waterfall Model was adopted throughout the phases of development using design tools such as Use Case diagrams to show the functionality of each entity represented in the system and an Entity Relationship Diagram to show the relationship between all entities. The system was implemented using various development tools such as Hypertext Markup Language (HTML) for an attractive, yet easy to use Graphical User Interface (GUI), PHP and MySQL for the storage in the database. The counselling support corrects the problems stated earlier by providing a system that is available worldwide 24/7, ensures client confidentiality with adequate security checkpoints in place to promote counselling among drug abusers.-317 The implementation of the support system increases availability of counselling services for drug users, slows down the rate of emerging drug abusers and helps understand new and better ways to help individuals round the world.
 
Research Model
Article
With the advancement of the Internet and telecommunication technologies, social media has become an integral part of our day to day lives. It facilitates the interaction among people by sharing information regardless of the location and time barriers. The use of social media has gradually changed and impacted on every aspect of the society, specially the higher education context. Students in higher educational institutes are using social media for academic as well as non-academic purposes. Thus, understanding the impact of social media on students' academic performance has become inevitable. Even though social media in higher education has been researched by many, the impact of social media on students' academic performance has not been addressed sufficiently, particularly in the Sri Lankan context. Review of literature revealed that there is a lack of comprehensive models and frameworks to summarize the impact of social media on students' academic performance. Hence, the objective of this study was to examine the impact of social media on students' academic performance in higher education. Based on a thorough review of literature, the current study formulated a comprehensive multi-dimensional model integrating Technology Acceptance Model (TAM), Theory of Planned Behavior (TPB) and IS success model. The model developed will be tested for its statistical validity using data collected from the higher education context.
 
Article
Korea has been a homogenous culture for over five thousand years. Although it has faced incursions and occupations, it has always repelled those advances and maintained racial, linguistic, and cultural purity with surprising resoluteness. However, Korea's modernization and economic expansion required alliances and policies that introduced multicultural forces into its once pure society, creating sizable racial minorities for the first time in history. The government's shift from authoritarian rule to liberal democracy has given voice to these minorities. These groups are demanding admittance to an exclusive society, along with equal and humane treatment. The people and government of Korea are now faced with the dilemma of dispensing with the exclusive dominance of their age-old, 'pure' culture to accommodate different ethnicities and practices. This paper will discuss the problems and potential solutions, including one that may already exist untapped in the Korean constitution.
 
Article
Traffic safety depends on a lot of factors associated with traffic accidents and where it takes place. Analyzing how variables related to traffic accidents influences on its frequency and severity may help on the proposition of significant improvement to the effective reduction of said accidents. The goal of this research is to analyze the impact of contributing factors to traffic accidents of any kind, reducing the number of variables related to the statistic model, adjusting it to the brazilian reallity. The methodology was applied in a case study in a 255km patch of a simple lane countryside highway in the state of Pernambuco. Statistics trials were taken to quantify its possible effects on the frequency and severity of traffic accidents. The analysis showed significant factors that contribute to the frequency and severity of the observed accidents. These factors were the amount of traffic (VDMA), radius of the horizontal curve, greide, age range and day of the week. Even though most of the accidents happened in tangent patches, the most severe accidents take place in turns. It also shows that young people between 18 and 30 years old are 22,7% more likely to get involved in fatal accidents than adults over 50 years old, and that in the weekends the chances of an accident occuring is 67% higher than during a week day. The analysis may be used to provide information on future reviews of parameter selection guidelines, especially regarding turns, based on the main parameters of the highway design to reduce risk of accidents in turns.
 
Technology Acceptance Model [13]
Research Model
Descriptive Statistics
Structural Model Test Results (Inner Model)
Article
Accounting education in universities a has challenges because are students millennial generations who have social characteristics, how to use information and build different knowledge, and e-learning systems as learning facilities have not been used optimally. The study aims to examine the role of shared accounting material in influencing the use of e-learning in the college environment, using a frame of technology acceptance model modified with the theory of planned behavior. A survey of accounting students at public universities in a city of Indonesia, academic year 2016/2017 that use e-learning, with seven constructs ability of using computer, perception of ease of use, perception of usability, user attitude, intention to behave, share and use of e-learning, with the instrument used a questionnaire in collecting primary data from 196 students majoring in accounting in the even semester as respondents. The results of the analysis using structural equation model partial least squares, showed that the ability to use the computer influence perception of ease of use and perception of usability, perceived ease of use affects user attitudes and usability perceptions, user attitudes affect the intention to behave, and the intention of behaving affect the use of e-learning systems, where as usability perception has no effect on user attitude and intention to behave in frames of technology acceptance. Sharing accounting materials affects user attitudes, behavioral intentions and the use of e-learning, but has no effect on usability perceptions in the frames of planned behavioral theories. The implications of the study that the preparation of teaching materials need to consider accounting material sharing activities for optimal use of e-learning.
 
Indicating the different study sites
Organs of the three plants involved in the treatment of sinusitis
Result of the chemical screening of the aqueous extracts from the organs of the three plants
Article
Costus afer, Massularia acuminate and Piptadeniastrum africanum are three plants used in Cameroonian traditional medicine to treat sinusitis. The aim of this study is to justify the interest granted to this three species in the treatment of this disease and to promote their sustainable management. The study was carried out at Bomb-Lissomb and at the goat market.-110 Several types of data were collected: data on the use of these plants in traditional anti-sinus medicine, data on their varied other uses by local residents, data on the availability of these plants as well as data on the interest that these species could generate. Furthermore, the evolution of treatment in patients who received plant extracts was followed after two months to justify their efficiency against sinusitis. The technique used for the removal of organs from the plant's vegetative growth was described. Finally, phytochemical screening of extracts obtained after aqueous maceration of plant organs was performed. Amongst the informants who took part to this study, 17 mentioned barks of Piptadeniastrum africanum and 29 mentioned fruits of Massularia acuminata to treat sinusitis. Treatments administered to patients are made either from monospecific recipes or from a mixture of two or three plants. The average duration of treatment is 29 days when patients are only treated with fruits of Massularia acuminata and 12 days when they are subjected to treatments based on a recipe made from stem barks of Piptadeniastrum africanum and fruits of Massularia acuminate. Treatment seems to be effective from the 2nd time the medication is taken. Harvesting techniques allowing large quantities of organs to be removed from a few individuals affects the regeneration of these individuals. Stems barks and leaves of Massularia acuminata contain almost the same bioactive compounds as fruits.
 
Article
In Civil Engineering, particularly in Geotechnics, several empirical methods, commonly referred to as dynamic equations, have been proposed for prediction of ultimate load capacity of driven piles. However, these formulas are admitted inaccurate and, so, there is a need to evaluate the results obtained by them. In this work a comparative analysis of the values obtained by five dynamic equations (Janbu, Danish, Gates, FHWA-Gates and WSDOT) with actual ultimate load capacities (obtained through pile load tests at site) is made. Errors are measured using the root mean squared error and the correlation between the equation´s results and the measured values is verified. The results showed important differences between the ultimate capacities obtained from the analyzed models and the real values verified in field tests. It was also verified a superiority, in terms of lower error and greater correlation, of the WSDOT and Danish formulas. Attempts were made to improve the methods. For this, coefficients were determined that, when multiplied by the results of the formulas, promoted a reduction in error. Once again, WSDOT presented best perform in terms of correlation and error.
 
Comparison numerical solution of the nonlinear problem given by (13) and PM approximation (29) 
Residual error (R.E.) of (29) for the values of the parameters given by (1-A)-(5-A). 
Article
This article proposes Perturbation Method (PM) to solve nonlinear problems. As case study PM is employed to provide a detailed study of a nonlinear galactic model. Our approach is rather elementary and seeks to explain as much detail as possible the material of this work.-140 In particular, our solution gives rise qualitatively, to the known flat rotation curves. In fact, we compare the numerical solution and the obtained approximation by employing observational data proving the validity and high accuracy of the model under study.
 
Non-inverting buck boost connected to a PV and in presence of control system 
module
Parameters of PI controller designed based on simplified and complete model
Parameters of Type3 controller designed based on simplified and complete model
Article
The design of controller based on simplified models can lead to difference between expected and practical results or even instability of the converter. Therefore, obtaining an accurate model is of great importance. In this paper, firstly, the accurate model of non-inverting buck boost converter by considering all parasitic components is obtained. Then, two PI and Type 3 controllers are designed based on accurate model. Afterwards, the performance of these controllers is compared with controllers designed based on a simplified model. All tests are carried out on a prototype of a non-inverting buck boost connected a photovoltaic module. The obtained results show the controllers designed based on accurate model have superior performance in comparison with controllers designed based on simplified model. In addition, the bode diagram obtained based on analog method in PSIM software and the one obtained based on transfer function of accurate model confirm the accuracy of the derived model.
 
Article
There have been numerous studies focused on the effect of water on asphalt mixtures, the mineralogy of the aggregates, mastic, and voids. In this research, the effect of water on binder is evaluated in the context of chemical changes, and how such changes impact the material rheological response of asphalt mixtures. This phenomenon has impact on the durability of pavement insomuch as water affects our roads due to prolonged periods of rain and high relative humidity; a typical characteristic of tropical countries. The procedure applied in this research was to submerge 2 mm thick sheets of asphalt in water (of constant controlled properties) for twenty-one (21) months. During that time, the progressive changes in chemical properties, physical properties, and performance of the asphalt were tracked. The results presented in this article are focused on the analysis of the asphalts' activation energy (and the generated change during the period of submersion) in relation to its response to the Multiple Stress Creep and Recovery (MSCR) test: one of the rheological tests that effectively represents the asphalts' behavior under different stress and strain levels.
 
Article
This paper presents Bouc-Wen hysteresis modelling and tracking control of piezoelectric stack APA120S. The actuator is used to control a microgripper. A modified Bouc-Wen non-symmetric model is applied to study the behaviour of the system in static and dynamic state. The good agreement between predicted and measured curve showed that the Bouc-Wen model is an effective mean for modelling the hysteresis of piezoelectric actuator system. Subsequently, the inverse Bouc-Wen model is formulated and applied to cancel the non-linear hysteresis. In perspective of a control design, it is desirable to linearize the non-linear Bouc-Wen model to produce a static system. Finally, in order to increase damping of the actuator system and to improve the control accuracy, a cascaded PID controller is designed with consideration of the dynamics and static behaviour of the actuator. Experiment result shows that error is of only 5% if PID is cascaded with hysteresis compensation. Therefore, hysteresis compensation with PID controller greatly improves the micromanipulation accuracy of the microgripper actuated by piezoelectric stack.
 
Top-cited authors
Iqbal Thonse Hawaldar
  • The Kingdom University
Saman Sarraf
Sheila M. Sison
  • The Kingdom University
Ozgur Kisi
  • Technical University of Lübeck, Germany
Rana Muhammad Adnan
  • Hohai University