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ABSTRACT: The Ejina Basin, located in arid northwest China, is one of the most arid areas in the world. In recent years, rapid development
has created a greater demand for water which is increasingly fulfilled by groundwater abstraction. Detailed knowledge of geochemical
evolution of groundwater and water quality can improve the understanding of a hydrochemical system, and promote sustainable
development and effective management of groundwater resources. To this end, a hydrochemical survey was conducted in the Ejina
Basin in order to identify the major hydrochemical characteristics. The results of chemical analysis indicate that groundwater
in the area is brackish. The major ions, TDS, and hydrochemical types of different areas are highly variable and show an obvious
zonation from the recharge area to the discharge area. Saturation index (SI), calculated according to the ionic ration plot,
indicates that the gypsum-halite dissolution reactions take place under the condition of the rock weathering to some extent,
and evaporation is the dominant factor to determine the major ionic composition in the study area.
Environmental Geology 04/2012; 57(5):1079-1087. · 1.13 Impact Factor
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ABSTRACT: An analysis, over historical times, of the influence of natural factors such as climate, geological activity, existing landforms,
and the activity of aeolian sands on the desertification of oases and other lands in the Heihe River basin of northwestern
China revealed that desertification occurred more or less quickly according to whether the prevailing climate was cold or
warm, respectively. In the 1990s, the area of desertified lands in the lower reaches of the Heihe River (Ejin region) was
29.1% greater than in the mid 1980s. However, the rate of desertification in the middle reaches of the Heihe River basin was
relatively slower, only 9.4% from 1949 to 1990 (or 0.27% per year). Since 1990, the rate of desertification has been stable.
By 2000, the total area of land desertification in the mid to lower reaches of the Heihe River basin was 13,508.4km2, or 11.8% of the region monitored. Of the total land desertification area, the regions of Linze, Gaotai, Sunan, Jiuquan,
Jia Yuguan, and Jinta accounted for 1.70, 1.71, 1.43, 0.85, 0.28, and 9.39%, respectively, whereas the Ejin region’s 11,434.64km2 accounted for 84.65%, indicating that land desertification in the lower Heihe River basin was particularly severe. The causes
responsible for the occurrence and development of land desertification in the Heihe River basin were analyzed.
KeywordsHeihe River basin-Land desertification in historical period-Modern land desertification-Origin analysis
Natural Hazards 04/2012; 53(2):273-290. · 1.53 Impact Factor
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ABSTRACT: The Heihe River Basin is a typical arid inland river basin for examining stress on groundwater resources in northwest China.
The basin is composed of large volumes of unconsolidated Quaternary sediments of widely differing grain size, and during the
past half century, rapid socio-economic development has created an increased demand for groundwater resources. Understanding
the hydrogeochemical processes of groundwater and water quality is important for sustainable development and effective management
of groundwater resources in the Heihe River basin. To this end, a total of 30 representative groundwater samples were collected
from different wells to monitor the water chemistry of various ions and its quality for irrigation. Chemical analysis shows
that water presents a large spatial variability of chemical facies (SO4
2−–HCO3−, SO4
2−–Cl−, and Cl−–SO4
2−) as groundwater flow from recharge area to discharge area. The ionic ratio indicates positive correlation between the flowing
pairs of parameters: Cl− and Na+(r=0.95), SO4
2− and Na+ (r=0.84), HCO3
− and Mg2+(r=0.86), and SO4
2− and Ca2+ (r=0.91). Dissolution of minerals, such as halite, gypsum, dolomite, silicate, and Mirabilite (Na2SO4·10H2O) in the sediments results in the Cl−, SO4
2−, HCO3
−, Na+, Ca2+ and Mg2+ content in the groundwater. Other reactions, such as evaporation, ion exchange, and deposition also influence the water composition.
The suitability of the groundwater for irrigation was assessed based on the US Salinity Laboratory salinity classification
and the Wilcox diagram. The results show that most of the groundwater samples are suitable for irrigation uses barring a few
locations in the dessert region in the northern sub-basin.
Environmental earth sciences 04/2012; 60(1):139-153. · 1.06 Impact Factor
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ABSTRACT: Identifying and classifying different network applications is very important for trend analysis, dynamic access control, network security and traffic engineering, while traffic classification is able to classify applications effectively. Current popular methods of traffic classification mainly include machine learning algorithm based on supervised or unsupervised and the method based load. In practical applications, the above methods have high complexity or low accuracy degree, so we propose a semi-supervised support vector machine method only based on flow statistics to identify and classify network applications. In this method, SVM, "constant" flow and co-training algorithm are the key core to obtain a classifier rapidly. The classifier got by this method has three advantages contrast to the previous classical methods: 1) high classification degree; 2) high generalization performance; 3) rapid computational performance. As a proof of concept, we implement the classification algorithm based on open-resource, and show the characteristics and feasibility of our method in the campus and resident network.
Communications (ICC), 2011 IEEE International Conference on; 07/2011
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ABSTRACT: Intervertebral disc degeneration (IDD) is a major health problem world-wide, and several spinal disorders are closely associated with it. Although people have invested a great deal of time and effort, how to prevent and reverse the IDD for the researchers is still a difficult and hot issue. Intervertebral disc belongs to cartilage tissue, and IDD also is the cartilage degeneration disease. A large quantity of studies have shown that Calcium pentosan polysulfate (CaPPS) and sodium pentosan polysulfate (NaPPS) possess chondroprotective activities and play an important role in maintaining cartilage integrity. We reasonably hypothesize that NaPPS and CaPPS may be used to treat IDD. The possible mechanism may include that: (1) the significant effects of NaPPS and CaPPS in improving capillary blood flow could maintain nutritional supply to intervertebral disc, and preserve intervertebral disc tissue against degeneration; (2) CaPPS and NaPPS preserve cartilage integrity, proteoglycan synthesis, and improve cartilage biomechanical properties; (3) as the multifaceted exosite inhibitors of proteinases NaPPS and CaPPS strongly impede the activity and production of proteinases; (4) promotion of the balance between proteinases and TIMPs also may be involved in treating IDD; (5) NaPPS and CaPPS exhibit potent anti-inflammatory effects, and then reduce inflammation-induced IDD. If the hypothesis were conformed, the symptoms caused by IDD and its related diseases would be a corresponding alleviation or even disappearance, which could greatly alleviate the suffering of patients from disc degeneration diseases. Certainly, many roles of CaPPS and NaPPS, such as effectiveness, safety and side effects, need to be tested, and further works such as animal model and clinical trial, need to be done to prove this hypothesis.
Medical Hypotheses 02/2011; 76(4):610-3. · 1.39 Impact Factor
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ABSTRACT: Spanning subgraph is necessary for the communication in networks. For example, the malfunctioning of one or more nodes in a network in general affects both the global and the local properties of the remaining nodes, because it makes some edges unusable and destroys the connectivity of the system. In this study, we focus on the characters of a network to be fractional-r-factors, fractional (r, k)-extendable and fractional (r,n)-deleteble. An efficient algorithm, based on a result which indicate that G has a minimum fractional 1-factor whose indictor function defined on {1, 1/2} if G has a fractional 1-factor, were designed to find a minimum fractional 1-factor.
E-Product E-Service and E-Entertainment (ICEEE), 2010 International Conference on; 12/2010
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ABSTRACT: Currently the popular methods of network traffic classification are the classification based on payload and supervised or unsupervised machine learning algorithm. But in the actual flows classification, traditional methods have faced more and more challenges due to increasing applications and difficult to obtain labeled flows. This paper proposes a traffic classification method based on co-training semi-supervised clustering. This method uses a few labeled flows and classifiers based on two different evaluation metrics to achieve high-performance classifiers. Finally we intercept data from the campus backbone and use open source tools to implement the experiment, which shows higher accuracy, precision and recall than other classic clustering methods (such as K-means, DBSCAN and two-layer semi-supervised clustering).
Advanced Intelligence and Awarenss Internet (AIAI 2010), 2010 International Conference on; 11/2010
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ABSTRACT: With the arrival of information age, business process has played a key role in enterprise operation. Not only is it the description of key business of enterprise, but also it has highly significance on guiding operation of enterprise, which is reflected in optimization of resources and organizations. To be the container of business process integration, process management system has been used in many large and medium-sized enterprise. However, most traditional process engines cannot meet the requirements of modern business process management any more. They don't provide enough support to user-customization because lacking agility and interoperability. In this paper, a process engine will be designed which fully supports user-customization according their demand. The main contributes are as follows: Firstly, the design of the process engine is brought forth, including model design, database design. Secondly, we will propose the architecture of this engine. Finally, we will demonstrate the implementation of this engine in ITSM (IT Service Management) system.
Advanced Intelligence and Awarenss Internet (AIAI 2010), 2010 International Conference on; 11/2010
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ABSTRACT: Network monitoring is essential for assessing performance issues, identifying and locating problems. There is increasing interest in passive monitoring of flows at multiple locations within a distributed network. In order to figure out how to place monitors under cost-effective and budget constraints within the network, a new approach is presented in this paper, which solves the problem of monitoring stations selection and the tradeoff between monitoring cost and reward. Using the method from combinatorial optimization on submodular of information gain, the approach firstly proves that joint entropy and information gain in network models satisfy submodularity under certain conditions, and then an approximate algorithm is proposed to solve optimizing problem of conditional entropies. On the basis, monitoring stations selected by our solution are much better than existing classical criterion. The simulation results validate the approach, demonstrating the solution improving monitoring quality, accuracy and computation time.
Computers and Communications (ISCC), 2010 IEEE Symposium on; 07/2010
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ABSTRACT: Editor's NoteResearchers at Kean University describe their experience developing and deploying a real-time environmental monitoring and visualization system using a mesh network of wireless sensors. Challenges they addressed in their design of the Wireless Integrated Network Sensors (WiNS) application include issues associated with the data volume, latency, and data synchronization from individually clocked sensors.-Dorée Duncan Seligmann.
IEEE Multimedia 07/2010; · 0.44 Impact Factor
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ABSTRACT: In this work we investigate a slot bow-tie antenna fabricated using wet-etching technique on a 5mil laminate having a low dielectric constant (ε r = 2.2). The planer antenna is aiming to operate, linearly polarized, in the range of 85–95 GHz. The return-loss measurements show acceptable agreement with FEM simulations. The simulated radiation patterns and Co/Cross polar patterns are also presented.
Antennas and Propagation (EuCAP), 2010 Proceedings of the Fourth European Conference on; 05/2010
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ABSTRACT: For MIMO-OFDM systems, maximum a posteriori probability (MAP) channel estimation algorithm induces large matrix inversion and product operation when it is applied to multiple-input multiple-output with orthogonal frequency division multiplexing (MIMO-OFDM) systems. And the data transmission efficiency will be reduced with the increasing number of transmit antennas. According to these problems, a high effective MAP algorithm for MIMO-OFDM is proposed. This algorithm which uses the characteristic of Expectation maximum (EM) algorithm decrease high complexity. To improve the data transmission efficiency and the performance of channel estimation, joint estimation is carried out over multiple OFDM symbols. Besides, depending on the spatial independence of MIMO channel in angle domain, the dimension-reduced MAP algorithm will be enhanced. Simulation results indicate the proposed algorithm obtains better the performance of estimation and higher data transmission efficiency.
Intelligent Computation Technology and Automation, 2009. ICICTA '09. Second International Conference on; 11/2009
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ABSTRACT: Coherent imaging systems always suffer from speckle phenomenon, which blurs the image, and therefore making the information extraction quite difficult. Hadamard speckle contrast reduction (SCR) is considered to be effective to deal with this problem in optics. In this paper, we explore the working principle and effectiveness of this approach, from mathematical deduction to system simulation, and from optics to millimetre wave frequencies, so as to understand why it works and how well it can perform. We show that the effectiveness of Hadamard SCR is linked to the texture of the objects' surface. The investigated cases are in the region of both millimetre wave frequencies and optics, but it should be clear that it is a wave-oriented discussion and therefore the problem should be considered in terms of electrical size, beyond the limitation of working frequencies.
Radar Conference, 2009. EuRAD 2009. European; 11/2009
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ABSTRACT: The railway passenger traffic volume(RPTV) forecast can offer scientific basis for the establishment of policy and making of transportation development plan. This paper applies the neural tree model for predicting the railway passenger traffic volume. The optimal structure is developed using the Improved Probabilistic Incremental Program Evolution(IPIPE) and the free parameters encoded in the optimal tree are optimized by the Particle Swarm Optimization(PSO) algorithm, and an improved sigmoid function is applied as the neural activation function, a new fitness function combines error and Occam's razor is used for for balancing of accuracy and parsimony of evolved structures. Based on the RPTV from 1985 to 2007 of China, the performance and efficiency of the applied model are evaluated and compared with the multi-layer feed-forward network(MLFN) and support vector machine(SVM).
Intelligent Computation Technology and Automation, International Conference on. 10/2009; 1:370-373.
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ABSTRACT: Degenerative disc disease (DDD) is a major health problem worldwide. Both Modic lesions and Schmorl's nodes are considered to correlate with DDD such as low back pain. Modic lesions are the changes of degenerative vertebral endplate and adjacent bone marrow observed on magnetic resonance imaging and are divided into three types. Modic type III lesions are thought to represent extensive subchondral bone sclerosis within the bone marrow of adjacent endplate. The pathological performance of Schmorl's nodes is cystic lesions around indistinct sclerotic margins and beneath the cartilaginous endplate. Coincidently, there are many similarities between Modic type III lesions and Schmorl's nodes including pathological appearances, pathogenetic location and related diseases.
We hypothesize that Modic type III lesions and Schmorl's nodes are the same pathological changes, and Modic type III lesions may be the quiescent or incipient pathology phrase of Schmorl's nodes. The clinical symptoms of DDD are also accompanied by emergence of these pathological changes.
A longitudinal study could be used to test this hypothesis. We could measure and analyze whether Modic type III lesions have increased in size or evolved into Schmorl's nodes as time goes on.
This hypothesis explains the possible pathologic process of Modic type III lesions and Schmorl's nodes. If the hypothesis were conformed, Modic type III lesions and Schmorl's nodes will be rediscovered, which provides the new basis for the clinical treatment of DDD. In additions, this hypothesis also has crucial significances for the classification of Modic lesions.
Medical Hypotheses 10/2009; 74(3):524-6. · 1.39 Impact Factor
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ABSTRACT: Since the subprime crisis, the variance of housing price is receiving increasing attention especially because of its complexity and practical applications. This paper applies the flexible neural tree model for forecasting the housing price index (HPI). The optimal structure is developed using the modified breeder genetic programming (MBGP) and the free parameters encoded in the optimal tree are optimized by the particle swarm optimization (PSO), and a new fitness function based on error and Occam's razor is used for for balancing of accuracy and parsimony of evolved structures. Based on the HPI of Shandong province, the performance and efficiency of the applied model are evaluated and compared with the classical multilayer feedforward network (MLFN) and support vector machine (SVM) models.
Computing, Communication, Control, and Management, 2009. CCCM 2009. ISECS International Colloquium on; 09/2009
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ABSTRACT: This paper presents an expectation-maximization (EM) based angle-domain algorithm (EMA) channel estimation for multiple-input multiple-output with orthogonal frequency division multiplexing (MIMO-OFDM) systems. Although EM algorithm combined with maximum a posteriori (MAP) estimator could obtain good performance, its high complexity makes this algorithm unpractical. The proposed algorithm do not require prior knowledge of the channel correlation, avoids inversion induced by LS algorithm and exploits channel coefficients irrelevance in angle domain for ignoring the small-valued channel taps and retaining only the most significant taps (MST) to reduce the effect of noise on the estimates. Simulation results indicate that the proposed algorithm gets better performance than phase shifted orthogonal LS (PSO-LS) and EM algorithms.
Industrial Electronics and Applications, 2009. ICIEA 2009. 4th IEEE Conference on; 06/2009
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ABSTRACT: In this paper, a unique physics package using slotted-tube cavity for rubidium atomic frequency standard has been described, including its structure, characteristics and performances. Due to the advantages of high cavity Q factor, large microwave filling factor, stable light intensity and so on, the physics package has obtained a high signal-to-noise ratio. The test results suggest that RAFS using this physics package has achieved an excellent short-term frequency stability of 1.2E-12 / tau<sup>frac12</sup> (1 s les tau les 100 s).
Frequency Control Symposium, 2009 Joint with the 22nd European Frequency and Time forum. IEEE International; 05/2009
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ABSTRACT: Imaging is a historical topic in optics, however, in the region of millimetre or sub-millimetre wave, due to the difficulty in fabrication and technology, active imaging system is still in its childhood compared to the relatively mature passive imaging system in the same frequency band. System modelling is important during the design phase, which could help the designers to understand the image formation process and consequently to work towards a better system. Considering the huge electrical size of the practical system, it is extremely hard to do a full-wave calculation. Physical optics (PO) explores the possibility to fulfil this task. In this paper, two models based on PO will be explained with comparisons between frequency domain calculation and spatial domain calculation. The goal is to draw some attention on the application of Fourier optics when we design a millimetre wave imaging system, and moreover, to propose a more physical model for the coherent imaging system.
Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on; 04/2009
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Medical Hypotheses 01/2009; 72(4):481. · 1.39 Impact Factor
