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Search Results: 1 - 10 of 22330 matches for " Jing Lou "
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Droplet coalescence and breakup: Numerical simulations using moving mesh interface tracking with dynamic mesh adaptation
Shaoping Quan,Jing Lou
Physics , 2010,
Abstract: Droplet(s) breakup and coalescence have been simulated by the finite volume/moving mesh interface tracking method (MMIT) with adaptive mesh refining and coarsening. In this method, the interface is zero-thickness and moves in a Lagrangian fashion. The breakup and the coalescence of the interfaces are simulated by the mesh separation and mesh combination schemes. Three cases are displayed in this video, which include the relaxation and breakup of an initially extended droplet, two identical droplets off-center collision, and a droplet pair in a shear flow. The mesh adaptation is capable of capturing large deformations and thin regions, and the smallest length resolved is three orders of magnitude smaller than the droplet radius. The fluid dynamics videos of the simulations are to be presented in the Gallery of Fluid Motion, 2010.
Detective Method for Water Pollution Based on Millimeter Wave Radiant Characteristics  [PDF]
Beibei Li, Guangfeng Zhang, Guowei Lou, Luyan Zhou, Jing Liu
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.43013
Abstract:

Aim at monitoring water pollution, especially the aquatic vegetation, the multilayer dielectric model based on incoherent method is established to analysis the brightness temperature of aquatic vegetation. A 3 mm radiometer is used to measure the radiant characteristics of water pollution. Compared to 3 layer dielectric model, the simulation result of multilayer dielectric model is in better accordance with the experimental data, which shows that the multilayer dielectric model can model aquatic vegetation’s radiant characteristics more precisely. This result shows that water has millimeter wave radiant characteristics of low brightness temperature, cold target compared to aquatic vegetation. Based on the study of water’s brightness temperatures and aquatic vegetation’s radiant characteristics, the radiant characteristics can be used to monitor aquatic vegetation.

Effect of job satisfaction on burnout among physicians: A survey study in urban public medical institutions in Hubei province, China  [PDF]
Yimin Zhang, Li Shen, Jiquan Lou, Yuan Jing, Yong Lu, Hong Liang, Xueshan Feng
Health (Health) , 2012, DOI: 10.4236/health.2012.410131
Abstract: Objectives: Chinese physicians are being loaded with the enormous psychological pressure and so tend to be susceptible to burnout. Little is known on the relationship between job satisfaction and burnout for physicians from urban public medical institutions. We aim to describe the degree of burnout and evaluate the impact of job satisfaction on burnout. Methods: A cross-sectional survey was conducted in March 2010 in Hubei province, central China. The job satisfaction and burnout instruments were obtained by modifying the Chinese Physicians’ Job Satisfaction Questionnaire and the Chinese Maslach Burnout Inventory, respectively. Such statistical methods as one-way ANOVA, Pearson correlation coefficient and GLM-univariate were employed. Results: The observed mean and burnout incidence on emotional exhaustion (3.45 ± 0.75, 66.99%) and depersonalization (3.56 ± 0.76, 68.64%) were high, but reduced personal accomplishment (2.18 ± 0.56, 5.79%) was low. The distribution of the degree of overall burnout was: 3.2% (severe), 48.2% (moderate), 35.4% (mild) and 13.2% (zero). Less the development level of urban area and higher the grade of medical institution was, more severe physicians’ burnout was. Job-itself satisfaction (b1 = -0.166, b2 = -0.056), job rewards satisfaction (b1 = -0.084, b2 = -0.150) and medical practicing environment satisfaction (b1 = -0.096, b2 = -0.319) were identified as significant negative predictors of emotional exhaustion (R2 = 0.35) and also of depersonalization (R2 = 0.46). Only the job-itself satisfaction (b3 = -0.355) contributed to reduced personal accomplishment (R2 = 0.40). significantly Conclusions: Occupational burnout, especially emotional exhaustion and depersonalization, is common and serious among Chinese physicians. Several, but not all dimensions of job satisfaction, which prove to have predictive effects on burnout, should be paid more attention to in order to improve physicians’ psychological health.
High Peak Power, Single-polarized, Sub-nanoseconds Pulses Generation of a Yb-doped Rod-type Photonic Crystal Fiber Amplifier  [PDF]
Ziwei Wang, Songtao Du, Zhaokun Wang, Jing He, Yunrong Wei, Qihong Lou, Jun Zhou
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.32B017
Abstract:

We report a high-peak-power, single-polarized master oscillator power amplification system employing polarization- maintaining Yb-doped rod-type photonic crystal fiber. The MOPA system comprises of a Q-switched microchip laser generating ~630ps pulses at 8.6 kHz repetition-rate and two amplification stages employing double cladding fiber and rod-type PCF respectively. The MOPA system obtains narrow spectral bandwidth, single-polarized pulses of 9W maximum output average power, corresponding to peak power of 1.7MW.

Numerical Simulation of Water Jet Flow Using Diffusion Flux Mixture Model
Zhi Shang,Jing Lou,Hongying Li
Journal of Fluids , 2014, DOI: 10.1155/2014/193215
Abstract: A multidimensional diffusion flux mixture model was developed to simulate water jet two-phase flows. Through the modification of the gravity using the gradients of the mixture velocity, the centrifugal force on the water droplets was able to be considered. The slip velocities between the continuous phase (gas) and the dispersed phase (water droplets) were able to be calculated through multidimensional diffusion flux velocities based on the modified multidimensional drift flux model. Through the numerical simulations, comparing with the experiments and the simulations of traditional algebraic slip mixture model on the water mist spray, the model was validated. 1. Introduction Liquid spray systems are widely used in many chemical, petrochemical, and biochemical industries, such as absorption, oxidation, hydrogenation, coal liquefaction, and aerobic fermentation. The operation of these systems is preferred because of the simple construction, ease of maintenance, and low operating costs. When the spray is injected from nozzle, it causes a turbulent stream to enable an optimum phase exchange. It is built in numerous forms of construction. The mixing is done by the liquid droplets and it requires less energy than mechanical stirring. A good understanding of the liquid droplet dynamics of the spray will help the engineers to design the high efficient facilities under optimized operating parameters. Although the operation of spray system is simple, due to the complexity of the two-phase turbulent flow, the actual physical flow phenomena are still lacking complete understanding of the fluid dynamics [1]. Many experimental facilities and methods were introduced to study the multiphase flows in spray systems. Ruck and Makiola [2] used a laser Doppler anemometer (LDA) to study the gas-oil droplet passing over a backward facing step. Ferrand et al. [3] used a phase Doppler and laser induced fluorescence technique to study the gas-droplet turbulent velocity and two-phase interaction through a jet with partly responsive droplets. Esposito et al. [4] used a monochrome charge-coupled device CCD camera to study the growth of the droplets. The experimental methods can provide very useful information about the liquid droplets at certain measurement points, but it is difficult for them to show the details of the flow fields and parameters inside the spray. Following the development of computer technology, it is already allowed to use the numerical method to do the researches in the recent decades [5]. Therefore, many researchers employ the numerical method, called
Finite 1-Regular Cayley Graphs of Valency 5
Jing Jian Li,Ben Gong Lou,Xiao Jun Zhang
International Journal of Combinatorics , 2013, DOI: 10.1155/2013/125916
Abstract:
Diagnostic Value of Bone Metabolic Markers ICTP and BAP in Lung Cancer Patients with Bone Metastases
Yu XIN,Baohui HAN,Jiatao LOU,Jing WU
Chinese Journal of Lung Cancer , 2010,
Abstract: Background and objective Bone metabolic markers are biomarkers derived from bone matrix or osteocyte reflecting bone metabolic situation. The aim of this study is to explore the diagnostic value of bone markers, cross-linked telopeptide of type I collage (ICTP) and bone-specific alkaline phosphatase (BAP) in lung cancer patients with bone metastases (B.M). Methods As a prospective control study, 110 cases were enrolled and divided into 3 groups. Totally 90 pre-treated, stage IV lung cancer cases were divided into two groups: 50 cases with bone metastases, 40 cases without bone metastases, as well as 20 healthy subjects were included as control. Serum ICTP was detected by enzyme-linked immunoassay (ELISA) and serum BAP was detected by electrochemiluminescence immunoassay. The relationships between factors of B.M and serum levels of ICTP, BAP were analyzed. Results The levels of serum ICTP and BAP in lung cancer patients with B.M were significantly higher than those in the healthy controls and those without B.M (P < 0.05). The level of serum BAP in patients with multiple B.M (lesions≥3) was significantly higher than that in patients with few B.M (lesions < 3) (P < 0.05). The level of serum BAP in patients with mixed pattern was significantly higher than that with lytic pattern. The sensibility of ICTP and BAP in the diagnosis of B.M in lung cancer patients was 18% and 40% respectively. The specificity of ICTP and BAP was 98.3% and 95% respectively. The accuracy rates of ICTP and BAP were 61.8% and 70.0% respectively. Joint detection of ICTP and BAP had improved sensibility and accuracy in the diagnosis of bone metastases in lung cancer patients (52% and 74.5% respectively). Conclusion Serum bone biochemical markers ICTP and BAP have diagnostic values for B.M in lung cancer patients with lower costs, noninvasiveness and convenience.
Finite 1-Regular Cayley Graphs of Valency 5
Jing Jian Li,Ben Gong Lou,Xiao Jun Zhang
International Journal of Combinatorics , 2013, DOI: 10.1155/2013/125916
Abstract: Let and . We say is -regular Cayley graph if acts regularly on its arcs. is said to be core-free if is core-free in some . In this paper, we prove that if an -regular Cayley graph of valency is not normal or binormal, then it is the normal cover of one of two core-free ones up to isomorphism. In particular, there are no core-free -regular Cayley graphs of valency . 1. Introduction We assume that all graphs in this paper are finite, simple, and undirected. Let be a graph. Denote the vertex set, arc set, and full automorphism group of by , , and , respectively. A graph is called -vertex-transitive or -arc-transitive if acts transitively on or , where . is simply called vertex-transitive, arc-transitive for the case where . In particular, is called -regular if acts regularly on its arcs and then 1-regular when . Let be a finite group with identity element . For a subset of with , the Cayley graph of (with respect to ) is defined as the graph with vertex set such that are adjacent if and only if . It is easy to see that a Cayley graph has valency , and it is connected if and only if . Li proved in [1] that there are only finite number of core-free -transitive Cayley graphs of valency for and and that, with the exceptions and , every -transitive Cayley graph is a normal cover of a core-free one. It was proved in [2] that there are core-free -transitive cubic Cayley graphs up to isomorphism, and there are no core-free -regular cubic Cayley graphs. A natural problem arises. Characterize -transitive Cayley graphs, in particular, which graphs are -regular? Until now, the result about -regular graphs mainly focused constructing examples. For example, Frucht gave the first example of cubic -regular graph in [3]. After then, Conder and Praeger constructed two infinite families of cubic -regular graphs in [4]. Maru?i? [5] and Malni? et al. [6] constructed two infinite families of tetravalent -regular graphs. Classifying such graphs has aroused great interest. Motivated by above results and problem, we consider -regular Cayley graphs of valency 5 in this paper. A graph can be viewed as a Cayley graph of a group if and only if contains a subgroup that is isomorphic to and acts regularly on the vertex set. For convenience, we denote this regular subgroup still by . If contains a normal subgroup that is regular and isomorphic to , then is called an X-normal Cayley graph of ; if is not normal in but has a subgroup which is normal in and semiregular on with exactly two orbits, then is called an X-bi-normal Cayley graph; furthermore if , is called normal or bi-normal. Some
Flow Patterns Transition Law of Oil-Water Two-Phase Flow under a Wide Range of Oil Phase Viscosity Condition
Wei Wang,Wei Cheng,Kai Li,Chen Lou,Jing Gong
Journal of Applied Mathematics , 2013, DOI: 10.1155/2013/291217
Abstract: A systematic work on the prediction of flow patterns transition of the oil-water two-phase flows is carried out under a wide range of oil phase viscosities, where four main flow regimes are considered including stratified, dispersed, core-annular, and intermittent flow. For oil with a relatively low viscosity, VKH criterion is considered for the stability of stratified flow, and critical drop size model is distinguished for the transition of o/w and w/o dispersed flow. For oil with a high viscousity, boundaries of core-annular flow are based on criteria proposed by Bannwart and Strazza et al. and neutral stability law ignoring that the velocity of the viscous phase is introduced for stratified flow. Comparisons between predictions and quantities of available data in both low and high viscosity oil-water flow from literatures show a good agreement. The framework provides extensive information about flow patterns transition of oil-water two-phase flow for industrial application. 1. Introduction Oil-water two-phase systems abound in many applications in the petroleum industry including emulsions preparation, oil-water mixture separation, and transportation. Accurate prediction of oil-water flow characteristics, such as flow pattern transition, is important in many engineering applications. Despite the importance, however, oil-water flow has not been explored to the same extent as gas-liquid flow. The density difference between the two phases is relatively small, while the viscosity ratio encountered can extend over several orders of magnitude, both of which bring great complexities and difficulties to the study of oil-water flow transitions. Various experimental works have been proposed in the literature to enhance the understanding of oil-water flow transitions [1–4] in horizontal pipes with the flow pattern being classified as stratified, dispersed, and mixed flow. Trallero [4] conducted extensive experimental and theoretical studies on oil-water flow patterns, where segregated and dispersed flow were mainly focused and a total of six patterns were identified. For the transition law of the flow patterns, Brauner and Maron [5] first developed a two-fluid model to characterize the transition from stratified flow to other flow patterns. Trallero [4] proposed that VKH criterion could predict the transition between stratified flow and unstable wavy stratified flow. Brauner [6] suggested an approach for the transition to dispersed flow pattern. Recently, Sharma et al. [7] introduced the energy minimization concept, a principle that a system can be stabilized
Do You Know where Your Money Is? Product Disclosure Statements for Discretionary Investment Services  [PDF]
Emily Lou
Beijing Law Review (BLR) , 2013, DOI: 10.4236/blr.2013.41006
Abstract:

New Zealand capital markets currently do not serve retail investors well, creating investor skepticism regarding participation. A recent Reader’s Digest survey rated financial advisers among the least trustworthy of professions. This article maps the legal implications of the new measures introduced by the Financial Markets Conduct Bill 2011 to guard investor interests in relation to financial products and services. The paper provides a useful critique of the proposed reforms, in particular, whether the “Product Disclosure Statement” (PDS) and the new licensing of fund managers will give retail investors confidence in investing through financial intermediaries. The paper concluded with recommendation for New Zealand regulator to obtain inspiration from overseas model.

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