bluuebunny/crossref_metadata_2025 huggingface dataset:
Zinc Finger X-Chromosomal Protein (ZFX) Promotes Solid Agar Colony Growth of Osteosarcoma Cells
Authors: Jiang Rui , Wang Jin-cheng , Sun Mei , Zhang Xing-yi , Wu Han
Published: October 2013

Zinc finger X-chromosomal protein (ZFX) is a member of the zinc finger family of proteins. The importance of ZFX in several cancer types, including prostate cancer, laryngeal squamous cell carcinoma, and glioma, has been addressed. However, the role of ZFX in human osteosarcoma remains
unknown. Here we investigated the phenotype of ZFX knockdown on cell proliferation and in vitro tumorigenesis using lentivirus-mediated loss-of-function strategy. The results demonstrated that the proliferation and colony formation ability of human osteosarcoma Saos-2 and MG63 cells was impaired
by ZFX small interfering RNA (siRNA)-expressing lentivirus. Moreover, loss of ZFX led to G0/G1 phase cell cycle arrest and a significant increase of cells in the sub-G1 fraction, indicating that ZFX functions as an oncogene in the malignant proliferation process
in osteosarcoma. Furthermore, ZFX siRNA may have an antitumorigenic effect on osteosarcoma cells. Our findings hold important significance for RNA interference-mediated cancer gene therapy for human osteosarcoma.
Cancer Stem Cell-Like Cells Exist in Mucoepidermoid Carcinoma Cell Line MC3
Authors: Zhang Louqiang , Xia Yichao , Li Longjiang , Wang Yin , Liu Ying , Li Chunjie , Yu Tao
Published: October 2013

Strong evidence for the presence of cancer stem cells (CSCs) in tumors exists. CSCs play an important role in the development, invasion, and drug resistance of carcinoma. Poorly differentiated mucoepidermoid carcinoma (MEC) is a lethal malignancy of human salivary gland tumors. However,
whether there are CSCs in MEC and their phenotypes remains unclear. We isolated side population (SP) and sphere-forming cells from the MEC cell line MC3 and identified their characteristics. The results showed that sphere-forming assays could enrich stem cell-like cells, with this group of
cells exhibiting high cloning efficiency, possessing strong tumorigenic ability, and highly expressing Oct4 based on PCR and immunocytochemistry assays. They also highly expressed CD44 and lowly expressed CD24 according to PCR, immunocytochemistry assays, and fluorescence-activated cell sorting
analysis. Higher cloning efficiency was observed in the SP cells, but PCR revealed that the SP and non-SP cells did not statistically differ in their expression of ABCG2, Oct4, CD44, and CD24. In spite of these, the findings were not conclusive on whether SP cells are stem cell-like cells.
In conclusion, CSC-like cells do exist in the MC3 cell line, and sphere-forming assays could enrich them, sphere-forming and SP cells are not the same kind of cell subpopulations, and the characteristics of SP cells need to be further investigated.
Electrochemical and electron microscopic characterization of Super-P based cathodes for Li–O2 batteries
Authors: Marinaro Mario , Eswara Moorthy Santhana K , Bernhard Jörg , Jörissen Ludwig , Wohlfahrt-Mehrens Margret , Kaiser Ute
Published: October 2013

Aprotic rechargeable Li–O2 batteries are currently receiving considerable interest because they can possibly offer significantly higher energy densities than conventional Li-ion batteries. The electrochemical behavior of Li–O2 batteries containing bis(trifluoromethane)sulfonimide lithium salt (LiTFSI)/tetraglyme electrolyte were investigated by galvanostatic cycling and electrochemical impedance spectroscopy measurements. Ex-situ X-ray diffraction and scanning electron microscopy were used to evaluate the formation/dissolution of Li2O2 particles at the cathode side during the operation of Li–O2 cells.
Gold-catalyzed glycosidation for the synthesis of trisaccharides by applying the armed–disarmed strategy
Authors: Kayastha Abhijeet K , Hotha Srinivas
Published: October 2013

The synthesis of oligosaccharides is still a challenging task as there is no universal glycosyl donor for the synthesis of all oligosaccharides. The gold catalysis for glycosidation reactions, in which alkynylated glycosides are used, has emerged as one of the versatile options in this regard. A cleavage of the interglycosidic bond that was thought to be due to the higher reaction temperature and the acidic medium was observed during the synthesis of trisaccharides. In addition, a very little percentage of deprotection of benzyl protecting groups at the C-6 position was observed and no deprotection of benzyl ethers in aliphatic molecules was noticed. In order to overcome this fact, a collection of leaving groups that contain an alkynyl moiety were screened. It was found that 1-ethynylcyclohexanyl (Ech) glycosides are suitable for carrying out the glycosidation at 25 °C in the presence of 5 mol % each of AuCl3 and AgSbF6. Subsequently, Ech-glycosides were observed to be suitable for the synthesis of trisaccharides under gold catalysis conditions.
Continuidad de la antropología tertulianea en las obras de san Paciano de Barcelona
Authors: López Montero Roberto
Published: October 2013

hitos antropológicos de San Paciano de Barcelona, autor hispano del siglo iv. Con ellos obtenemos elementos valiosos para la construcción de su esquema antropológico. Por otro lado, se muestra una clara continuidad de su pensamiento con los esquemas teológicos de autores pre-nicenos tan importantes como Tertuliano de Cartago. Cabe preguntarse, además, si se dejan sentir en el obispo de Barcelona las categorías de otros autores en quienes la antropología asiática también dejó su impronta, como Hilario de Poitiers.
Integrar y excluir (comunión y excomunión en el Medievo)
Authors: Mitre Fernández Emilio
Published: October 2013

La excomunión medieval, en sus diversas manifestaciones tiene unas raíces bíblicas, patrísticas y canónicas. A lo largo del Medievo se aplicará en diversas situaciones y a toda clase de personas aunque las aplicadas por papas a monarcas sean las mas llamativas. La Baja Edad Media aumentará las críticas a este expediente por parte de destacados autores (Marsilio de Padua y Guillermo de Ockham a la cabeza) y por parte de diversos organismos políticos: vg. las Cortes castellanas.
El sermón catalán de San Vicente Ferrer sobre san Martín de Tours
Authors: Ferreiro Alberto
Published: October 2013

Uno de los santos más venerados en la edad media fue San Martín de Tours, cuyo culto continúa hasta hoy en muchas partes del mundo. En la edad media, se hizo tan popular como otros grandes Santos: Thomas Becket, Santiago de Compostela y la Virgen María. El culto de San Martín se hizo prominente en la Península Ibérica antes y después de la aparición del culto a Santiago de Compostela. En los sermones voluminosos de San Vicente Ferrer esta uno en Catalán que está dedicado a este santo tan venerado de Galia. Las fuentes más importantes procedentes de la antigu.edad tardía y principios medievales que forma el fondo de este sermón son Gallus y la Vita Sancti Martini de Sulpicio Severo. Sin embargo, en la alta edad media, su culto se popularizó a través de la Legenda Aurea escrita por el dominico Jacobus de Vorágine, que sintetiza las dos obras de Sulpicio. Por otra parte, San Vicente predicó no para realizar grandes avances doctrinales- su principal interés fue predicar el evangelio, no escribir teología académica. Sin embargo, exhibió gran creatividad. El objeto de este estudio es el sermón en Catalán de San Vicente Alius Sermo Sancti Martini, CXXIV
Formación y evolución del patrimonio del Monasterio de Santa Clara de Alcocer en la Edad Media
Authors: Martín Prieto Pablo
Published: October 2013

En el presente artículo se ofrece una descripción global del patrimonio de un monasterio de Clarisas castellano en la Edad Media. El estudio de los componentes de este patrimonio monástico ayuda a entender los actores, las fuerzas y los fenómenos implicados en el proceso. Desde la misma Corona castellana, hasta simples campesinos y propietarios del común, pasando por algunas figuras relevantes de la nobleza de la época, todos ellos contribuyeron a la formación, estabilidad y sucesiva transformación del patrimonio de este monasterio hasta el final de los tiempos medievales. Su evolución también ilustra las distintas etapas en el desarrollo de la economía castellana desde el siglo XIII hasta el comienzo de la Modernidad.
Ergonomic Design Issues in Icons Used in Digital Cameras in India
Authors: Mukhopadhyay Prabir
Published: October 2013

This paper investigates the usability of five commonly used icons in digital cameras like landscape, video, night portrait and automatic mode. In the first phase a set of 10 open type questionnaires were applied on 110 students (75 male and 35 female) to get an insight into the type of problems with the icons. The second phase comprised of 5 ranking questionnaire. The third phase comprised of icon comprehension test for getting to know the stereotype strength of the different icons. The fourth phase was stereotypy test. The second and third phases were applied on 32 students (16 male and 16 females.). For each category of icons there was one icon which was rated best and comprehended very well. For example the icon for landscape mode which represented a mountain was ranked as the best and the stereotype strength for the same was 90.6%.
Risk Assessment on Slope Stability of Beijing-Zhuhai Highway K46
Authors: Ruan Yong Fen , Wang Fei , Li Qi , Shi Bing Jin
Published: October 2013

Based on a large number of statistical analyses on the highway landslide, landslide risk evaluation index system is established. According to expert experience method and analytic hierarchy process (AHP) to determine weights of landslide disaster risk index and vulnerability evaluation index, the fuzzy comprehensive evaluation method is used to analyze landslide hazard dangerousness and vulnerability, also to evaluate potential risk on the right side cutting slop of mountainous highway from Beijing to Zhuhai in section D blocks K46 + 375 to K46 + 500 before the construction is going on, therefore, the targeted slope protection design will be finalized on the analysis results. The research results can enhance the awareness of similar landslide disaster and provide analysis reference for the similar projects in the future.
VCFEM Method Mixed with Finite Element Method Calculation of Numerical Simulation
Authors: Xu Jia Li , Guo Ran , Gai Wen Hai
Published: October 2013

As a new type of composite material, particle reinforced composite materials, which has good mechanical properties and secondary machining, have been widely used in mechanical, biological, aerospace, military, motor and other important industrial areas. With the development of science and technology lots of research and numerical simulation have been carried on at home and aboard. Because of the reinforcements, the overall mechanical properties have been significantly improved. At the same time, fracture properties and fatigue characteristics are lower. This paper, based on the VCFEM, lead in the traditional FEM to research particle reinforced composite materials, tending to get a better result in simulating the mechanical property. The principle of the voronoi unit Based on the particle composites as the research object, combine four node isoparametric element with the voronoi cell mesh together to complete the structure calculation.to make the description of the distribution of high stress of the interface of inclusion particles more accurate. As we know that due to the reinforcement, the original features of the material have changed. To a certain extent, reduce its applicability. The interface layer is the important reason of the damage. As Fig1-1, Contact interface between particle and matrix cracking cracks. This makes a third crack boundary. means crack boundary, means inclusion particles, crack boundary, means substrate crack boundary, so we can find that at it still satisfy: (1) Fig 1 Containing inclusions, consider interface debonded voronoi cell At and because of the cracking, the two boundaries have no restraint, so satisfy the following boundary conditions (on border) (2) (on border) (3)
Effect of Rotating Speed on Hydraulic Energy Recovery Turbines Performance
Authors: Shi Feng Xia , Yang Jun Hu , Wang Xiao Hui
Published: October 2013

In order to forecast the rotating speed of the hydraulic energy recovery turbine, Single centrifugal pump and single centrifugal pump with guide vane in reverse operation were adopted as turbines. 3D models were founded by pro/E software for turbines, Then the models were meshed by gambit and Simulated by fluent6.3 software. It was shown that before the best efficiency points, The higher the rotating speed, the lower the efficiency of turbine . but after the best efficiency points, the efficiency of turbine increased with the rise of rotating speed. with the rise of rotating speed ,the pressure in runner inlet was added, the amplitude of pressure pulse was added. the pressure distribution in runner inlet was more even of model B than that of model A. With a guide vane ,The steady scope of rotating speed in hydraulic energy recovery turbine was diminished,and the Controllability of rotating speed in hydraulic energy recovery turbines can be improved by guide vane. Some theories were offered for hydraulic energy recovery turbine researches.
The Critical Slip Surface Search of Non-Homogeneous Slopes Based on the Global Procedure for Slope Stability Analysis
Authors: Sun Cong , Li Chun Guang , Zheng Hong
Published: October 2013

On the basis of the global analysis method of slope stability, a nonlinear optimum model is proposed for the location of the critical slip surface. In this method, both the factor of safety and vertical coordinates of discrete points on the slip surface are taken as independent variables, and the factor of safety as the objective function, with the constraints including the global equilibrium equations and convexity on the critical slip surface. For non-homogeneous slopes, a smoothing scheme is proposed. Thus the optimization problem can be solved by the classic gradient-based algorithms. The examples show that the proposed method enjoys excellent numerical stability.
Optimization Design the Configuration Sizes of Multi-Layer Rectangle Micro-Channel Heat Sink
Authors: Wang Li Feng , Shao Bao Dong , Cheng He Ming , He Ying
Published: October 2013

The configuration sizes of multi-layer rectangle micro-channel heat sink are optimized, which has been widely used to cool electronic chip for its high heat transfer coefficient and compact structure. Taking the thermal resistance and the pressure drop as goal functions, a binary-objective optimization model was proposed for the multi-layer rectangle micro-channel heat sink based on Sequential Quadratic Programming (SQP) method. The number of optimized micro-channel in width n1 and that in height n2 are 24 and 3, the width of optimized micro-channel Wc and fin Wf are 360 and 55μm, the height of optimized micro-channel Hc is 1000μm, and the corresponding total thermal resistance of the whole micro-channel heat sink is 1.5429 °C/W. The corresponding pressure drop is about 2.3454 Pa. When the velocity of liquid is larger than 0.3 m/s, the effect of change of velocity of liquid on the thermal resistance and pressure drop can be neglected.
Numerical Simulation of Depleted EAF Jet Flow
Authors: Wang Chong , Zhu Dao Fei , Liu Fan Han , Wang Shi Bo , Wang Hua
Published: October 2013

In view of the serious problems that low-rate reduction and excessive oil consumption of reducing oil guns which are used in the depleted EAF, analyzing the jet mixing process through the CFD simulation with the method of liquid level tracking, we find that the purpose of mixing slag layer, guaranteeing matte layer precipitation and saving oil can be achieved by changing combination of gas rate of mixture injected by the oil gun, jet speed and insertion depth. The results of this paper provide a theoretical foundation for optimizing reducing technical process of the slag cleaning furnace operation in a copper industry Company.
Study of Permanent Thermal Insulation for Arch Dam in Cold Region
Authors: Xie Zhi Qiang , Cui Jian Hua , Chen Qin , Qi Yong Feng , Huang Yong
Published: October 2013

For virtue of small volume and fast speed of construction, arch dam is the most suitable dam type in cold region, where construction period is relatively short each year. Low average value and large amplitude of atmospheric temperature make temperature stress distribution of arch affect directly by thickness of permanent insulation material as while as the time of thermal insulation. Extreme climate lead to stricter external insulation requirement for cold region arch than these in common district, however, thermal insulation will increase the burden of artificial cooling and extend the construction period. Therefore, it is complicated and critical for arch dam crack prevention to study on permanent thermal insulation. In view of this, finite element method was applied for simulation of construction processes of a practical project in cold region. Influence of permanent thermal insulation layer thickness and selection of insulation time is analyzed, in order to provide basis for permanent thermal insulation optimization.
Numerical Simulation on the Overturn Process of Towering Reinforced Concrete Chimney during Directional Demolition Blasting
Authors: Xie Jian Bin , Fu Miao , Wu Chang Chang , Hu Deng Feng , Du Yun He
Published: October 2013

On the basis of plastic-elastic mechanics and finite element method, one selected 150m high reinforced concrete chimney was taken as the target in this paper to analyze the mechanical condition of directional demolition blasting, the capsizing time, the internal force of support abutment and constitutive relation of the chimney during directional blasting. A finite element model of the towering reinforced concrete chimney was established through separated modeling method by finite element analysis software LS-DYNA of ANSYS. Results show that the constitutive relation given by this paper conforms to reality. The finite element model of the towering reinforced concrete chimney established by separated modeling method is reasonable. The real overturn process, capsizing location and capsizing length of towering reinforced concrete chimney during directional demolition blasting are agree with that of numerical simulation.
Study of the Design Method for The Shape of Charge Curve of the Double Focusing Warhead
Authors: Xie Qiu Chen , Han Feng , Chen Fang
Published: October 2013

For the prefab fragments, firstly, according to the requirements of focusing regions and width at the lethal radius ,the method of pushing down has been used to design the shape of charge curve of the double focusing warhead initiated in the center of the warhead. Then, the warhead with this charge curve designed has been simulated by AUTODYN-3D.The results show that the charge curve designed which is divided into several independent arcs could satisfy the focusing effect. The design method is of great value to the engineering design for other kinds of warhead.
Research on Test Points Selection Using Complex Field Fault Modeling in Analog Circuit
Authors: Yang Jing , Yang Cheng Lin , Liu Zhen
Published: October 2013

In this paper, a new test nodes selection technique based on the complex field fault modeling of analog circuits testability is presented. The function F () by the complex field fault modeling can be used as the fault model, which is applicable to both hard (open or short) and soft (parametric) faults. Therefore, we can obtain the signature curves of the potential fault components by PSPICE and MATLAB. For the testability of fault model, fault-test dependency matrix can be concluded. With the integer-coded fault-wise table method and heuristic graph search algorithm, we can obtain a global minimum node set. The number of potential faults with complex field fault modeling is half compared with the traditional methods and the time complexity of the circuit can be reduced significantly.
Balance Adjustment of the Gravel-Sand River Downstream Reservoir
Authors: Zhu Ling Ling , Ge Hua
Published: October 2013

In this article, the typical phenomenon of bed armoring was firstly summarized based on both the field and experiment data, and then followed by the analysis on its internal influence on the reformation process to the balance status for the gravel-sand rivers. It was pointed out that this phenomenon is caused by the chosen of the flow, that the finer sediment particles are washed away and the coarser ones are left on the river bed surface. This phenomenon firstly restricts the start of the sediment particles on the bed surface, secondly increases the river bed surface resistance and reduces the flow velocity. The comprehensive effect of these two aspects leads to the final balance status for the gravel-sand river.
Seismic Response on the Mangjiedu Long-Span PC Continuous Rigid Frame Bridge with High Piers
Authors: Xie Jian Bin , Hu Deng Feng , Fu Miao , Wu Chang Chang
Published: October 2013

The selected high-span continuous rigid frame bridge for studying is Mangjiedu Bridge in this paper. Based on the principle of structure dynamics and the method of seismic response analysis, the finite element model of the main bridge in Mangjiedu Bridge under Midas-civil was built according to the structural features, site conditions and seismic fortification intensity of the bridge. Then the characteristics of main bridge structure were studied using Lanzcos modal analysis method, and the seismic responses of main bridge are studied by earthquake response spectrum analysis and time history analysis respectively. The results show that the fundamental frequency of the main bridge is 0.1943Hz, and the transverse vibration mode shapes are most remarkable in the former 10 ordered types of vibration of main bridge. The main bridge is in the conditions of elastic range and does not failure under E1 earthquake. Both response spectrum analysis and time history analysis show that the largest displacement along the main bridge appears at the top of pier and the largest transverse displacement appears in the central position of main span. It also shows that the maximum shear and maximum moment occur at the bottom of main pier.
Influence of Turbine Blade Cooling Efficiency on Turbofan Engine Performance
Authors: Zhu Li Ya , Huang Qin
Published: October 2013

On the basis of a performance emulation model of turbofan engine, a relation curve was first employed to fix the efficiency of compression components. With the turbine blade cooling efficiency being a restriction, an optimization algorithm was developed on the premise that engine cycle parameters match. The calculation results show that when the turbine blade cooling efficiency was improved at a fixed bypass ratio, the engine overall pressure ratio corresponding to the lowest specific fuel consumption (sfc) grows on a large scale, while the lowest sfc slightly drops and the specific thrust significantly boosts.
Diamond Circular Saw Blades Noise Attenuation and Finite Element Modal Analysis
Authors: Zhang Ming Song , Zhu Pu Xian , Ke Jian Jun , Zhu Yi Kuan
Published: October 2013

The finite element modal analysis was used to study natural frequency of circular saw blade, when slotted. Finding the frequency of slotted is smaller than no slotted saw blade, showing that slot can have the effect of noise attenuation. The increasing of slot length, slot width, slot position, slot number can reduce the natural frequency of circular saw blade on the whole. The orthogonal text was used to study slot parameters. Finding that slot parameters’ influence of primary and secondary relations on saw blade first five natural frequency is slot position > slot number> slot length > slot width.
Comparison of Surface Heat-Transfer Coefficient of GCr15 Steel Quenched by Clear Water and Nitrogen-Spray Water
Authors: Hou Li Jun , Cheng He Ming , Li Jian Yun , Shao Bao Dong , Hou Jie
Published: October 2013

In order to simulate the thermal stresses, thermal strains and residual stresses of steel during quenching by numerical means, it is necessary to obtain an accurate boundary condition of temperature field. The explicit finite difference method, nonlinear estimate method and the experimental relation between temperature and time during water and nitrogen-spray water quenching have been used to solve the inverse problem of heat conduction. The relations between surface heat-transfer coefficient in water and nitrogen-spray water quenching and surface temperature of cylinder have been given. In numerical calculation, the thermal physical properties of material were treated as the function of temperature. The results show that the relations between surface heat-transfer coefficient and surface temperature are non-linear during water and nitrogen-spray water quenching, the heat-transfer coefficient is bigger when water quenching than when nitrogen-spray water before 580°C, the heat-transfer coefficient is smaller when water quenching than when nitrogen-spray water after 400°C. The results of calculation coincided with the results of experiment. This method can effectively determine the surface heat-transfer coefficient during water and nitrogen-spray water quenching.
In-Plane Mixed-Mode Fracture of the Thin Sheet Metal
Authors: Lv Jing , Yang Bang Cheng , Ran Chun , Shao Yong Ping
Published: October 2013

The length of crack extension under stable crack extension is measured by digital image correlation technology and based on mixed-mode I/II fracture test. Quantitative analyses of the fracture properties are provided for thin sheet metals at stable crack extension under mode I, mode II and mixed-mode I/II loading conditions. The strain field of the crack tip at crack initiation is calculated by VIC-2D. It is suggested that the location of crack initiation is not at the crack tip. The fracture of recycled thin sheet metals is tough due to the large plastic deformation; mode I crack is the most difficult to extend; the load-carrying capacity is the minimum in 45° loading.
Mechanical Model for Dynamic Behavior of Concrete Subjected to Impact Loading
Authors: Sun Yuan Xiang , Wang Da Kui
Published: October 2013

A coupled model of damage and plasticity to describe the complex behavior of concrete subjected to impact loading is proposed in this paper. The concrete is assumed as homogeneous continuum with pre-existing micro-cracks and micro-voids. Damage to concrete is caused due to micro-crack nucleation, growth and coalescence, and defined as the probability of fracture at a given crack density. It induces a decrease of strength and stiffness of concrete. Compaction of concrete is physically a collapse of the material voids. It produces the plastic strain in the concrete and, at the same time, an increase of the bulk modulus. In terms of crack growth model, micro-cracks are activated, and begin to propagate gradually. When crack density reaches a critical value, concrete takes place the smashing destroy. The model parameters for mortar are determined using plate impact experiment with uni-axial strain state. Comparison with the test results shows that the proposed model can give consistent prediction of the impact behavior of concrete.
Numerical Investigation of Bumps and Oscillation in the Cylindrical Membrane Inflation
Authors: Wang Cong Lei , Sun Jian Hong , Xu Chang Yue
Published: October 2013

Numerical investigation on the fluid structure interaction in the cylindrical membrane inflation is performed by the Euler-Largrangian method. In membrane inflation, the vortex flow and wave system induced by the interaction between compressible jet flow and membrane appeared inside membrane. This phenomenon concentrates the stresses and generates a pair of bumps. The influences of oscillation and bumps on membrane working performance and safety are also investigated.
Study on the Resistance Loss Model of Slurry Pipeline for Iron Ore Concentrate with High Concentration
Authors: Leng Ting Ting , Meng Hua , Wu Jian De
Published: October 2013

This paper introduces two models for calculating friction loss in slurry pipeline. Based on the comparison between the measured pressure loss of the highly concentrated iron ore concentrate slurry pipeline in Dahongshan, Yunnan Province, CHINA and the calculation outcomes of the two models, the model which can predict pressure loss in this kind of slurry pipelines has been found.
Trajectory Control for Cartesian Pneumatic Manipulator Using the Terminal Sliding Mode Control Method
Authors: Qiu Shi Ying , Yi Peng , Yuan Rui Bo , Yang Huan , Hui Sen , Xue Rong Ping
Published: October 2013

This paper applies the terminal sliding mode control method to control the trajectory of a three axises Cartesian Pneumatic Manipulator. A mathematical model of the pneumatic servo control system was established at first, then the terminal sliding mode control method was used for trajectory control. The simulation results shows that the tracking error of the terminal sliding mode control method become large only in the time period of not fully reaching the convergence point in time when the manipulator tracks the space straight line, whereas it can fully track the target trajectory after reaching the convergence point.
Finite Element Analysis and Simulation of the Sealing Performance of Y-Ring Rubber Seal
Authors: Cui Kai Bo , Qin Jun Qi , Di Chang Chun , Yang Yan Feng
Published: October 2013

Application of super elasticity theory and nonlinear theory, based on finite element method and the Abaqus software, the performance of Y ring rubber seal, such as the Von Mises stress, the sealing ring deformation and the contact pressure were simulated and analyzed under the influence of changeable hydraulic pressure. According to seal failure criterion, the effect of hydraulic pressure changes on the sealing performance were studied. Results show that, the maximum stress appears in the intersection of lips, the largest deformation area near the inner lip. The root has greater contact pressure, which would result in bitten phenomenon or aggravate wear.
The Analysis of Switch Installing Optimization Based on FMEA Algorithm
Authors: Lei Jin Hui , Zhao Xiao Xia , Cheng Dong , Liu Jing , Li Bin
Published: October 2013

In this paper, the distribution network structures divided as per the possible state configuration sequences based on different switch states (close/open) are analyzed with FMEA algorithm and calculated with regional equivalent improvement method. All switch configuration solutions will be assessed after the different regional economic advantages are fully considered and then the highest power availability solution on average is found. The case research shows that when the switch configuration comes to 111001, we get relatively balanced powersupply load of every branch and relatively high standard indexes.
Dynamic Response Analysis of Double-Column Pier Mudslides
Authors: Liu Shan , Li Rui , Liu Qian Qian
Published: October 2013

In recent years, the cases that bridges under the action of debris flow been damaged have increased year by year. In this paper, the dynamic response of the double-column pier under the action of the debris flow are studied. Using the finite element method, considering the action of the upper structures dead load, the analysis of the changes about the displacement and stress of the pier bottom was conducted, as well as the deformation and stress changes in pile foundation.
MCMC Parameters Estimation in the Inverse Problem of Spontaneous Combustion
Authors: Luo Quan Bing , Wang Li , Liang Dong
Published: October 2013

Spontaneous combustion is a complicated process and its control function is a partial differential equation (PDE) of heat conduction. To solve the problem of spontaneous combustion, we should specify some parameters first, such as the heat source, thermal conductivity, convective heat transfer coefficient, and so on. Some parameters can be got easily and accurately, but some are not. So there could be a great gap between the result of numerical simulation and the result of experiment. For this inverse problem, we can estimate these parameters with the MCMC (Markov Chain Monte Carlo) method. Then, we could get more accuracy and reliable numerical result.
Study on the Theory and Methods of Bolt-Shotcrete Support for Weak Surrounding Rock Based on Reliability Analysis
Authors: Ou Zhe , Chen Cong Xin , Cheng Guan Wen , Zheng Yun
Published: October 2013

The evaluation of stability and reliability of support system for tunnel weak surrounding rock are difficult issues of concern in rock and soil engineering. Aiming at the problem of parameter design and reliability evaluation of tunnel weak surrounding rock and bolt-shotcrete support system, the deformation, failure mechanism and physical mechanical properties of weak surrounding rock are analyzed as well as the mechanism of bolt-shotcrete support in soft rock is studied. And the reliability analysis equation of bolt-shotcrete support in two kinds of weak surrounding rock (nearly horizontal layered mechanics medium and continuum mechanics medium) is established. The quantitative soft rock supporting theory is introduced into the reliability analysis equation. The calculation formula of two important design parameters of anchoring force and bolt spacing in bolt-shotcrete support is established. Finally an engineering example is adopted to prove the rationality of the calculation results. Therefor this paper provides theoretical basis and design method for supporting structure design and reliability evaluation of tunnel weak surrounding rock.
Effect of Relative Height of Planting Denture on Interdental Food Impaction: A Numerical Study
Authors: Qiao Ai Ke , Zhang Zhan Zhu , Fu Yu Lin , Yang De Sheng
Published: October 2013

The study about the impact of implant denture on getting stuck between the teeth is rarely reported. Computational modeling and simulation was performed in this study in order to investigate the effect of planting denture on interdental food impaction. Four groups of experiment were designed; Simplified teeth models were established and meshed; loads were applied to the models and boundary conditions were constrained in the state of teeth chewing. Finite element method was employed to analyze the deformation of teeth and impacted object. When the force exerting on the impacted object is in the range of 0-5.5N, the distance between denture and tooth after planting denture is less than that between the normal teeth. The deformation is the minimum when the denture is lower than tooth. When the force exerting on the impacted object is in the range of 0-5.5N, interdental food impaction is easier to occur after planting denture, and Interdental food impaction may be more likely prevented when denture is lower than tooth.
Numerical Simulation of Multi-Layer Rectangle Micro-Channel Heat Sink for Single-Phase Flow and Heat Transfer
Authors: Wang Li Feng , Shao Bao Dong , Cheng He Ming , He Ying
Published: October 2013

The single-phase flow and heat transfer for multi-layer rectangle micro-channel heat sink are numerically simulated. During the simulation, Finite Volume Method (FVM) was used to solve Computational Fluid Dynamics (CFD) problem. First order upwind scheme was used to discrete control equations, and semi-implicit method for pressure-linked equations was used to solve discretization equations. The maximum temperature difference is 76.2362 °C, and the total thermal resistance is 0.4765 °C/W, which agrees well with the result of analysis result 0.5145 °C/W. The corresponding pressure drop is about 54.1360 N/m2.
Solving Mid-Frequency Acoustic Problem by the Meshless Method
Authors: Wang Shuang , Huang Qi Bai , Li Shan De
Published: October 2013

It is well known that traditional finite element (FEM) is an efficient method in solving engineering problems. However, when solving the acoustic problems in medium frequency, FEM suffers from the so-called pollution effect, which is directly related to the dispersion. In this paper, meshless method based on radial basis function (RBF) is introduced to solve the acoustic problem, which shows that the dispersion can be greatly reduced, thus it is very suitable for the solution of mid-frequency acoustic problem. In addition, an algorithm is presented to treat the boundary condition, which improves the performance of the meshless method.
A Review on Application of Discrete Element Method in Soil Cutting Process
Authors: Yang Ju , Wang Cheng Wu , Wang Feng Hua , Yang Xiao Jing
Published: October 2013

Soil is one of the important mediators in the agricultural production and its particle is a discontinuous, heterogeneity and nonlinear natural geological substance. It is difficult to analyze the soil cutting process by using traditional methods. According to the discrete nature of the agricultural soils, discrete element method based on the discontinuity assumptions can be an alternative to analyze the changes under external forces in the soil cutting process. This article describes the basic principles, its applications and its prospects of the discrete element method, especially in the field of soil cutting.
Modeling and Numerical Simulation of a Gas/Drop Flow
Authors: Xue She Sheng
Published: October 2013

To investigate the mechanism of TUSOG(Transverse Uniform Singlet Oxygen Generator), a two-phase, chemistry reactive flows model is established to describe the physical and chemical performances of Cl2/He mixed gases which transversely travels through a falling BHP(KOH,H2O2,H2O) droplets field, and the relevant numerical simulation is carried out. In the gas-phase model equations, the mass source term is determined by drop-absorbed chlorine and released singlet oxygen due to chemical reaction between drops and chlorine. An assumption is made that the BHP drops have equal sizes and fall vertically in equal speeds. The set of gas-phase control equations is solved by SIMPLEC scheme. The computational results agree well with the test results provided by relevant reference. It is found, that chlorine utility and singlet oxygen yield decreases with increasement of gas inflow speed, and increases with increasement of the speeds of falling drops, and the absorption of chlorine mainly takes place in the upstream reactive region.
Probabilistic Method to Determine Widespread Fatigue Damage Average Behavior of Fleet
Authors: Zhan Fu Yu , Yang Wei , Zhang Zhi Xian
Published: October 2013

Widespread Fatigue Damage (WFD) issue is a major threat to the structural integrity of the aging aircrafts, So WFD assessment is a key measurement and necessary task to ensure the continuing airworthiness. A methodology using probabilistic framework to assess WFD was developed. The major feature of this method is that a stochastic process which is introduced to crack initiation and crack growth as well as yield stress and fracture toughness. Stress Intensity Factor (SIF) was incrementally calculated using Finite Element Method (FEM). Numerical studies were performed for panels with five holes using Monte Carlo Simulation (MCS). The WFD Average Behavior, include inspection, monitoring and repair period, was presented, and the convergence of the MCS was also discussed. The effectiveness of this methodology was verified by comparing the experimental data. This approach simulated and evaluated the WFD behavior and got the relative statistic data, which provided a practical engineering method for WFD evaluation.
Thermodynamic of Moving Mould in Anode Plate Vertical Casting Device
Authors: Hui Sen , Luo Jing , Xue Rong Ping , Qiu Shi Yin , Yang Huan , Peng Zhi Fei
Published: October 2013

Machinery, especially, lead electrolysis Non-ferrous Metallurgy industry needs higher and higher temperature accuracy in manufacturing equipments by accompanying the development of the science and technology. During the process of lead electrolysis manufacturing equipment, the anode plate vertical casting system is a producing device which aims to complete the casting of the anode plate. However, simple cool system and poor cool effect and lower production efficiency of the domestic anode plate manufacturing equipment are the common short comings which exist currently. Therefore, we designed in Solidworks based on a comprehensive analysis of the mechanical structure of the mold, and obtain the time of right temperature of moving mould in a stable state, thought to verify the rationality of the design of the equipment cooling system.
A Study of Forest Trees Fire Modeling
Authors: Shang Chao , Wang Ke Yin , Huang Hai Ying , Chen Yu Kun
Published: October 2013

The computer simulation has become an important means to study fire broke out and its law of development today. Fire Dynamics Simulator is three-dimensional computational fluid dynamics software based on LES. And it is widely used in the field of fire science. However, it is rarely used in the study of forest fires. Through the study of tree morphological parameters,combined with the modeling features of the pre and post-processing graphical software PyroSIM, this article explored a tree modeling method for FDS.
Numerical Simulation of Premixed Propane/Air Flame Propagation Using a Dynamically Thickened Flame Approach
Authors: Xiao Hua Hua , Mao Zhan Li , An Wei Guang , Wang Qing Song , Sun Jin Hua
Published: October 2013

A numerical study of premixed propane/air flame propagation in a closed duct is presented. A dynamically thickened flame (TF) method is applied to model the premixed combustion. The reaction of propane in air is taken into account using a single-step global Arrhenius kinetics. It is shown that the premixed flame undergoes four stages of dynamics in the propagation. The formation of tulip flame phenomenon is observed. The pressure during the combustion process grows exponentially at the finger-shape flame stage and then slows down until the formation of tulip shape. After tulip formation the pressure increases quickly again with the increase of the flame surface area. The vortex motion behind the flame front advects the flame into tulip shape. The study indicates that the TF model is quite reliable for the investigation of premixed propane/air flame propagation.
Development of Wall-Adapting Local Eddy Viscosity Model for Study of Fire Dynamics in a Large Compartment
Authors: Yuen A.C.Y. , Yeoh G.H. , Yuen R.K.K. , Lo S.M. , Chen T.
Published: October 2013

The Wall Adpating Local Eddy Viscosity (WALE) subgrid-scale turbulence model was adopted for an in-house large eddy simulation (LES) fire code in which the turbulence is fully coupled combustion and radiation models. The traditional Smagorinsky subgrid-scale model accounts only strain rate of the turbulent structure while the WALE model considers both the strain and the rotation rates. Furthermore, the WALE model automatically recovers the near wall-scaling for the eddy viscosity hence more adaptive for wall bounded flows.A 15 m long test hall fire was reconstructed by the in-house fire code with 1.5 MW fire source. The performance of the WALE model was assessed by comparingpredicted transient gas temperatures and velocities at various spatial locations.
Study of Stress Wave Propagation in SHPB with NHDMOC
Authors: Xu Ming Li , Zhang Guang Ying , Zhang Ruo Qi
Published: October 2013

In this paper the NHDMOC method which succeeded in studying stress wave propagation with one dimensional strain was applied to study the one-dimensional stress wave propagation. In this paper, the ZWT nonlinear visco-elastic constitutive relationship with 7 parameters to NHDMOC, and corresponding equations were deduced The equations was verified from the comparison of elastic stress wave propagation in SHPB with elastic bar and visco-elastic bar respectively. Finally the dispersion and attenuation of stress wave in SHPB with visco-elastic bar was studied.
The Empirical Research between China's Scientific and Technological Investment and Economic Growth
Authors: Lei Ying
Published: October 2013

In order to explore the relationship between China's scientific and technological progress and economic growth, granger test is been used on investment in science and technology and economic growth based on the sample period (1995-2010) of economic data.The experimental results show that : the scientific and technological progress and economic growth are each other's Granger causes. The paper divide the investment of science and technology into the manpower investment and financial investment in the analysis of economic growth and investment of science and technology the causality, then do Granger causality test on economic growth index GDP.
Analysis of Euler-Bernoulli Beam with Piecewise Quadratic Hermite Finite Elements
Authors: Li Cong Ying , Zhang Han Jie , Wang Dong Dong
Published: October 2013

The piecewise quadratic Hermite polynomials are employed in the finite element context to analyze the static and free vibration behaviors of Euler-Bernoulli beam. The desirable C1 continuity is achieved for the piecewise quadratic Hermite element that is required for the numerical solution of the Galerkin weak form of Euler-Bernoulli beam. In contrast to the classical cubic Hermite element, the piecewise quadratic Hermite element has a piecewise constant curvature representation within each element and thus the integration of the stiffness matrix is trivial. Several benchmark problems are shown to demonstrate the convergence properties of the piecewise quadratic Hermite element. The frequency error of the beam free vibration with this quadratic Hermite element is derived as well. Numerical examples consistently verify the analytical convergence rates.
Modeling, Fabrication and Characterization of Piezoelectric ZnO-Based Micro-Sensors and Micro-Actuators
Authors: Yuan Yan Hui , Du He Jun , Xia Xin , Wong Yoke Rung
Published: October 2013

In this study, capabilities of zinc oxide (ZnO) thin films in sensing and actuating were investigated using micromachined micro-cantilevers. A heterogeneous piezoelectric cantilever was modeled to study its response under voltage and/or external mechanical loading. A ZnO thin-film micro-cantilever was designed based on the developed theoretical model. Simulated tip deflections of the micro-cantilever were on the nanometer level under typical electrical and mechanical input. A prototype was fabricated with microfabrication techniques. The ZnO thin film was sputtered at room temperature and demonstrated good compatibility with common chemicals and processes in micromachining. The fabricated micro-cantilever was experimentally characterized for its actuating and sensing performance. For actuator characterization tip deflection of the micro-cantilever was detected by a laser Doppler vibrometer, while for sensor characterization the micro-cantilever was calibrated as an acceleration sensor using a reference accelerometer. The experimental resonant frequency, actuating and sensing sensitivities agreed well the design specifications.
The Automatic Checkout Method of Balloon-Tracking Data at Unequal Intervals of Time
Authors: He Jing , Liu Bing , Liu Yang
Published: October 2013

By tracking a beacon ball with theodolite and radar synchronously to inspect the accuracy of ra-dar data is one of the common calibrating methods without calibration towers at sea. Relied on some com-plications, the theodolite which acts as the standard in the precision test can not following the track of a d-ynamic target continuously for a long time. So the present processing methods based on isochronal interv-als can just make use of less continuous data. Upon that a new dynamic adaptive checkout method is introduced. It solves the problem of outliers-eliminating automatically among a great deal of data at unequal in-terval time by three culling steps. The results indicate that this method can eliminate outliers in beacon ball tracking data and make batch processing base on uncontinuous data implemented effectively. Not only the data quantity has been increased, but also the data process efficiency has been improved.