Science topics: ThermodynamicsPressure
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Pressure - Science topic

A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
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Blade design for a solar chimney power plant turbine is modeled geometrically. NACA 4412 blade is selected for its favorable lift to drag characteristics in the considered diameter range. The constructed model is integrated into a solar chimney plant and validated against existing examples in literature. A similar process is applied using a reverse...
Article
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Along subduction zone megathrust faults, the transition from smectite to illite with depth occurs at temperatures of ∼150 °C and has long been hypothesized to be one of the dominant controls on the updip limit of the seismogenic zone. Despite this, there have been few experimental studies performed at in-situ conditions to test the frictional stabi...
Article
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This paper presents a technical-economical optimization by maximizing the ratio between the critical buckling pressure (technical characteristic) and the production cost (economic characteristic) of stiffened cylindrical shells, a basic concept of value analysis. Critical buckling load values were determined using both the Finite Element Method (FE...
Article
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The effects of interference of pressure waves in simple piping systems were studied. A freeware computer code Allievi developed at the University of Valencia was used to simulate dynamic waveforms in simple and complex networks. The tests were carried out according to three scenarios. No pressure increases significantly exceeding the Joukowsky pres...
Chapter
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The chapter explores whether, or to what extent, recent work in experimental philosophy puts pressure on the idea that the concept of causation is ‘egalitarian’. Causal selection – where experimental subjects tend to rate the causal strength of (for example) a norm-violator more strongly than a non-norm-violator – is a well established phenomenon,...
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The heat transfer characteristics of evaporative condensers in an R744 air conditioning system were evaluated using the numerical and the experimental methods. Two configurations of condensers were studied: Case 1 with five layers of tubes and Case 2 with eight layers of tubes. In order to evaluate the heat transfer characteristics, the temperature...
Article
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In this article, we study generic density of bilayered ϕ(J1),\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\phi (\mathcal {J}_{1}),$$\end{document}ϕ(J2),\documentclas...
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In unsaturated soil mechanics, the soil–water characteristic curve (SWCC) is the most fundamental soil attribute. All seepage analyses require SWCC to generate the pore-water pressure and water content distribution within the soil layers. SWCC is often determined using laboratory procedures. However, the expensive cost, long testing time, and diffi...
Article
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We show that the Reynolds averaged equations for compressible fluids (neglecting third order correlations) are well‐posed in Hs$$ {H}^s $$ when the pressure vanishes in dimensions d=2$$ d=2 $$ and 3. In order to do this, we show that the system is Friedrichs‐symmetrizable. This model belongs to the class of non‐conservative hyperbolic systems. Henc...
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To accurately identify the land ecological security in the middle and lower reaches of the Yangtze River, we measured the land ecological security based on the PSR model, selected a total of 19 indicators, such as population density, and applied the methods of system evaluation value conversion, comprehensive evaluation value and coordination degre...
Article
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Measurements were conducted in the fully developed turbulent flow in a pipe with internal diameter D at a Reynolds number of Re D = 1.6 × 10 5. The pipe walls were equipped with regularly spaced square ribs of relative height h∕D = 0.154 , while the pitch-to-roughness height was varied between p∕h = 1.67 and p∕h = 6.67. The measurements include mea...
Article
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We are reporting a new locality of calc-granulite from the Baradgatta area of the Makrohar granulite belt including the mineral assemblage garnet-clinopyroxene-plagioclase-sphene-clinozoisite. The Makrohar granulite belt (MKG) is located northwest extension of the chotanagpur granite gneiss complex along the northern margin of the central Indian te...
Article
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Transient uptake curves for propane gas in a bed of HZSM-5 using a volumetric frequency response setup (batch system) were obtained. Thereby, a perturbation, such as a change in volume, was applied to the solid/gas system, and the resulting change in pressure was detected. Two cases of mass transfer limitations (bed diffusion control and micropore...
Conference Paper
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In this research, the numerical investigation of the infrasonic flow around the NACA 64A010 airfoil has been done. The generation of geometry and mesh was done using ICEM software and the solution was done by Fluent software. To verify the accuracy of the solution, the lift coefficient in terms of drag angle has been compared with the experimental...
Article
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In order to meet the increasing demands of the battery in terms of range, safety and performance, it is necessary to ensure optimal operation conditions of a lithium-ion cell. In this thesis, the influence of mechanical boundary conditions on the cell is investigated theoretically and experimentally. First, fundamental equations are derived that le...
Poster
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Agriculture was adopted in several regions of the world during the Holocene, around 12000 cal BP. Evidence suggests that tooth size has decreased over evolutionary time. Some authors have suggested that the change in tooth size was due to multiple factors such as dietary changes, new technologies and biological functional requirements, all of which...
Article
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The current study examined the effects of security score framing, time pressure, and brand familiarity on mobile application choices. Past research has found the framing of safety versus risk scores affects how potential risks for mobile apps is communicated to users. Both time pressure and brand familiarity have been shown to affect consumers’ pur...
Article
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Marine dissolved organic matter (DOM) is a key component of the global carbon cycle. While marine DOM properties are usually characterized by chemical approaches, an effort to integrate its variations in an ecological perspective is needed. Heterotrophic prokaryotes being the main consumers of marine DOM, targeting their responses to varying DOM pr...
Article
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Businesses are under pressure to increasingly consider sustainability as an integral part of the enterprise and business model. Nature-based solutions (NBS) definitions reflect that sustainability can be improved by implementing NBS. These NBS require tailored business models. Therefore, this study aims to conceptualize a holistic business model ca...
Chapter
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Using Abrasive waterjet (AWJ) for rail treatment was first proposed by our research team. In order to further clarify the parametric response of AWJ on kerf characteristics including the top kerf width (ω), the kerf taper (θ) and the kerf depth (h), experiments were carried out on a section of the rail specimen in this study. Experiments were desig...
Article
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The characteristics of compacted bentonite after swelling determine the long-term stability of barrier systems. Due to the fact that the current stress level is the most important variable in determining the performance of engineered geosystems, this study aims to investigate the stress states and the consequent change in engineering properties of...
Conference Paper
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The development of avionic products is subject to high-cost pressure due to increasing international competition and small batch sizes. To compete on the global market in a long-term view, potentially arising complexity costs must already be considered in the early phases of the product generation development process. Existing approaches to cost ev...
Article
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Mulching landscape beds is a common task for landscapers seeking to affect soil conditions and reduce weed pressure. This study investigated the effects of three pine (Pinus sp.) straw mulch depths (5, 10, and 15 cm) on soil moisture/ temperature modulation during late winter/spring. No differences in soil volumetric water content were observed; ho...
Article
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This paper aims to explore the effects of a sill under a standard sluice gate on the development of the intake vortices. In total, 200 experiments were carried out. Sills with different shapes and widths were considered both numerical and experimentally. Results indicated that using a sill changes the flow depth and upstream pressure. Using a sille...
Chapter
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Earth pressure is a critical foundation for retaining wall design and verification, but in the earth pressure calculation, the geometrical parameters of the retaining wall itself are not taken into account in the tests of the stability of the retaining wall. In order to obtain a more complete method for calculating retaining walls, this paper analy...
Article
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On September 28, 2018, liquefaction in Sibalaya damaged irrigation canals and hit 51.2 hectares fields and roads. This phenomenon was triggered by an earthquake of magnitude 7.5 that shook Sigi Regency, Central Sulawesi Province. As an increase in soil pore water pressure is one of the causes of liquefaction, the pore water pressure ratio (ru) at t...
Poster
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This is an observational study; patients with lipoedema were found to have marked tenderness at the site of perforators shown by Doppler Ultrasound. This was in marked contrast to patients with lymphoedema and chronic venous insufficiency. Treatment with compression hosiery, sometimes with additional built-in pressure was effective in relieving loc...
Article
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Plain Language Summary The Luzon Strait deepwater overflow (LSDO), as the only deep connection between Pacific and South China Sea (SCS), plays a pivotal role in the abyssal and overturning circulations in the SCS. However, the mechanism of the seasonal variation in the LSDO has not been fully understood. Based on long‐term ocean bottom pressure da...
Article
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This paper is focused on the problem as the main tool for modeling of thinking and creativity. It traces the history of using problems in the psychology of thinking and analyzes how classical works in this field describe the relationship between a problem, a task, a problem situation, etc. Problem complexity is treated as the key property that allo...
Article
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In recent years, heat transfer enhancement of heat exchange equipment has attracted more and more attention. In this paper, the heat transfer and pressure drop characteristics of sine wavy flying-wing fins are studied by numerical method. The objective is to improve the integrated heat transfer and pressure drop performance of sine wavy flying-wing...
Article
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A recent paper [Lee et al., J. Kor. Cryst. Growth Cryst. Technol. 33, 61 (2023)] provides some experimental indications that Pb10−xCux(PO4)6O with x≈1, coined LK-99, might be a room-temperature superconductor at ambient pressure. Our density-functional theory (DFT) calculations show lattice parameters and a volume contraction with x, very similar t...
Article
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The 65 ml/r fuel pump proposed in this paper is a new type of large-displacement piston pump. The pump is of the roller plunger type construction. This structure enables the pump to have good performance even under high and variable speed conditions. Firstly, force analysis of this pump and establishment of mathematical model of pump mechanical eff...
Article
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Malay women today have experienced major changes in their careers. However, unlike men, they are still bound by the responsibility of managing their households, even though they have careers. Balancing between their careers and households is difficult, and they face various challenges, which have been highlighted by Malay women authors, the most pr...
Chapter
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The pressure at any point in a liquid can be thought of as being caused by a vertical column of the liquid which, due to its weight, exerts a pressure equal to the pressure at the point in question. The height of this column is called the static head and is expressed in terms of feet of liquid.
Research Proposal
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The study was based on showing the role of pressure systems by analyzing daily surface weather maps (1000) millibars and maps of the upper atmosphere (850)millibars and (500) millibars to determine the type of pressure system Which causing the short cold waves that (123) wave in (369) days, as Daily comprehensive maps were analyzed for three levels...
Article
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The adoption of Social Media Marketing (SMM) is increasingly present in the daily life of companies. However, little is known about this phenomenon in the context of micro and small businesses (MSEs). The research aimed to analyze the SMM adoption process by MSEs, based on a study with 338 entrepreneurs linked to the Brazilian Micro and Small Busin...
Article
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The coexistence of stationary Görtler and crossflow instabilities in boundary layers covering incompressible to hypersonic regimes is investigated by varying the local sweep angle, pressure gradient, wall curvature, and wall temperature using linear stability analysis. The results show that increasing the local sweep angle under a fixed concave cur...
Article
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We revisit the problem of polytypism in layered MX2 materials, with a view to reinterpreting the phase space accessible to this family. Our starting point is to develop a simple, constructive, and compact label for the most commonly observed stacking arrangements, similar to the Glazer notation used to label tilt systems in perovskites. The key adv...
Article
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7‐Tesla (T) magnetic resonance imaging may allow for higher resolution images but may produce greater acoustic noise than 1.5‐ and 3‐T scanners. We sought to characterize the intensity of acoustic noise from 7‐ versus 3‐T scanners. A‐weighted sound pressure levels from 5 types of pulse sequences used for brain and inner ear imaging in 3‐ and 7‐T sc...
Article
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A new method for determining the burning rate of a solid propellant, called the Impulse Method, is proposed in this paper. It is based on the proportional relationship between the impulse generated and the mass of the burned propellant. The pressure–time and thrust–time curves are obtained from a tubular propellant grain burning in the chamber, who...
Article
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Although the production of high-quality hydrogen from electrolysis systems is essential, research in this area is limited. In this study, we investigate the effect of operating conditions on the change in oxygen concentration through computational analysis for optimizing the deoxo chamber of a water electrolysis system. The test results of the wate...
Article
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Comparison of Ankle Brachial Index (ABI), Toe Brachial Index (TBI), and Trans-Cutaneous Partial Pressure of Oxygen (TcPO2) in Prediction of Limb Outcome Among Patients with Diabetic Foot Ulcers (DFUs).
Article
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In recent decades, the paradigm of secularization has been under pressure [...]
Article
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100 years ago, two scientists M.N. Saha and S.N. Basu tried to give an equation of state for real gas system by taking into consideration the probabilistic theory of finite volume of gas molecules as well as the influence of cohesive force. As compared to experimental observation, their theoretical prediction elucidates very close agreement of crit...
Preprint
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We show on the biophysical basis that the observed enzyme kinetic parameters related to the substrate binding, product turnover and catalytic efficiency follow power-law type density functions. These finding are validated with the available datasets on various enzymes across different substrates. The product turnover rates and catalytic efficiencie...
Article
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In recent years, trimarans have been used in high-speed transport and in warships, but studies of them have made little progress. We designed a trimaran model and used it to perform a water-entry experiment to find a way to reduce the slamming pressure. The process of the model entering the water was divided into several steps, and different theore...
Article
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The paper presents an analysis of the experimental results of direct hydrogen injection in a dual-fuel diesel engine. The test object is a four-cylinder, four-stroke ADCR engine. An analysis of the following parameters was carried out: indicated mean effective pressure, peak pressure, angle of maximum pressure and released heat. Statistical analysi...
Article
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Support and resistance strategy is widely recognized in financial markets as it revolves around identifying specific price levels on a chart where the buying and selling pressure is historically significant. By analyzing these historical price actions and market trends, traders can utilize fundamental analysis strategies to predict future price mov...
Article
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Previous studies suggested that Atlantic Multidecadal Variability (AMV) modulations on pan-Pacific sea surface temperature (SST) variability and prediction are model-dependent. These results were mainly based on SST forcing experiments in which AMV-related Atlantic SST anomalies were prescribed. However, the AMV itself is also model-dependent, but...
Conference Paper
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المستخلص أن الهدف من الدراسة الحاليه هو تسليط الضؤ على مدى أهمية الارشاد بأسلوب اللعب كون اللعب يستخدم في اشباع حجات الاطفال ولاسيما أن اللعب هو حاجة تحتاج الى الاشباع بحد ذاته ويتيح اللعب التنفيس عن الضغوط لكي يحافظ الفرد على التوازن النفسي لانه وسيلة للتعبير عن الانفعالات المكبوته وذلك من خلال اللعب ومن خلاله أيضا يمكن تشخيص الاضطرابات السلوكية و...
Article
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This paper reports our effort and findings in investigating streamer monofilament operated in barrier discharge setup in pure nitrogen at a pressure of 200 Torr. In order to grasp the sub-nanosecond nature of the streamer monofilament we used several diagnostics techniques: measurement of electrical characteristics, streamer imaging using 4-channel...
Article
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We studied the pressurized carbonization conditions that can produce high-strength coke at low temperature (800°C) from formed coals containing a large amount of non-caking or slightly-caking coal. It was found that as the rapid heating temperature range (room temperature → 450–600°C) increased, the amount of adherence between coal particles increa...
Article
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This study aimed to develop a two-color pressure-sensitive paint (PSP) that has both high pressure sensitivity and high temperature sensitivity. Different nitrobenzoxadiazole (NBD) derivatives were used as the temperature probe. Among them, NBD-ZY37 demonstrated favorable stability against photodegradation, and its temperature sensitivity in an RTV...
Article
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Uterine artery embolization (UAE) for the treatment of symptomatic uterine fibroids and non-controllable adenomyosis symptoms is a relatively new procedure for organ-preserving therapy. These benign conditions can become symptomatic in about 30% of women between the ages of 35 and 50. The purpose of the UAE either for fibroids or adenomyosis is the...
Preprint
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The presented device allows to reduce forces for load in different engines by leveraging the principle of pascal of incompressible liquid where the pressure remains constant and then amplifying the force applied to small section area to produce pressure that will apply into big section area. Description The figure below shows the device. The column...
Preprint
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Every wave arises from resonance between potential and kinetic energy. Unlike resonance, no wave, not even the light wave, can work! The natural explanation for the speed of any type of wave is that its speed results from the resonance condition of potential and kinetic energy arising from the interaction of pressure and density. This is also valid...
Article
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In order to understand the mechanism of cavity shedding and evolution, turbulent cavitating flows of the twisted hydrofoil were numerically investigated using the k-? turbulence model and the ZGB cavitation model. The results of the numerical calculation and the experimental method are basically consistent, which confirms the feasibility of the num...
Article
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This paper is devoted to the detection and analysis of overpressure zones in unconsolidated seafloor sediments using an ocean-bottom seismometer. The methodological aspects of creating a system of anomalous pore pressure zone detection in marine sediments are studied. The aim of this study is to establish the requirements for a pore pressure monito...
Article
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This review provides a thorough analysis of the progress made in smart polymer composite materials, which have recently been seen as potential game-changers in areas such as construction, aerospace, biomedical engineering, and energy. This article emphasizes the distinctive characteristics of these materials, including their responsiveness to stimu...
Conference Paper
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Lightening seat cushions while enhancing seating comfort is a compelling area of research for seat manufacturers. Past studies showed that pre-shaped support could reduce weight and improve comfort. However, the influence of cushion foam properties, including thickness and stiffness, remains relatively unexplored. This case study aimed to address t...
Article
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We study the problem of matching interior and exterior solutions to Einstein’s equations along a particular hypersurface. We present the main aspects of the C3 matching approach that involve third-order derivatives of the corresponding metric tensors in contrast to the standard C2 matching procedures known in general relativity, which impose condit...
Article
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We present a novel method for numerically finding quasi-isodynamic stellarator magnetic fields with excellent fast-particle confinement and extremely small neoclassical transport. The method works particularly well in configurations with only one field period. We examine the properties of these newfound quasi-isodynamic configurations, including th...
Article
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The aerodynamics of high-speed vehicles in evacuated tunnels is studied with particular reference to the consequences of choked flow conditions at the tails of the vehicles. It is shown that this has a dominant influence on overall conditions (pressure, temperature, velocity). Together with the need for the evacuated tunnel system to be closed, the...
Article
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This perspective article focuses on how researchers help to secure the research integrity-related responsibilities of various institutions in their various roles, as same researcher can fulfill the tasks of different stakeholders, be in different roles, and wear multiple hats simultaneously while performing duties at different levels. Institutions...
Preprint
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The results of electron-beam processing of Mn-Zn ferrite samples using pulsed and continuous electron beams in the forevacuum pressure range (10 Pa) are presented. We find that continuous electron-beam processing leads to surface structuring of the ferrite, changes in elemental composition on the surface, and electrical property modification. The d...
Article
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In this study, data on water shortage events were collected from customer service systems. An analysis was conducted to establish the relationship between customers’ complaints and the water pressure flow conditions. A mathematical model was developed to estimate the probability of water shortage events based on water head. The Sigmoid function is...