bluuebunny/crossref_metadata_2025 huggingface dataset:
Vehicle License Plate Location Based on High Frequency Vertical Edge and Mathematical Morphology
Authors: Yang Yong , Wang Zhi Feng , Yu Ben Cheng , Yin Zhi Hao
Published: August 2013

The paper takes mathematical morphology into locomotive image by operating the high frequency sub image after wavelet first level decomposition, finding the license rectangular area, extracting the area position by area researching, and then further making sure the license area by line and row projecting.
Keywords: wavelet; rectangular area; area researching;
Fluid Inclusion and Mineralization Epochs Studies of Luziyuan Pb-Zn Deposit in Yunnan Province, Southwestern China
Authors: Cang Fu Bin , Deng Ming Guo , Liu Wei
Published: August 2013

In the thesis, we studied fluid inclusions in minerals and mineralization epochs of Luziyuan Pb-Zn deposits in eastern of Zhenkang Yunnan province. 240 available data have been obtined by observing characteristics of fluid inclusions in sphalerite, quartz, fluorite, calcite under microscope and selecting 284 primary inclusions and secondary inclusions thermometry. Various mineralization epochs homogenization temperature, freezing temperatures, salinity frequency histogram showed a bimodal distribution mode. The fluid inclusions in sphalerite have a greatly important,it is ore-forming fluids. Its homogenization temperature distributed in 240 to 270°C (medium temperature) and 187 to 220°C (low temperature) within the range of two, (W NaCl) salinity is 5.0% to 10.6%. According to the homogenization temperature and salinity, it can be deduced Luziyuan mineralization fluids density of 0.82 to 0.96 (gcm-3). Draw the deposits are mainly two hydrothermal mineralization, a hydrothermal in medium temperature, another period of low and medium temperature. The two ore-forming fluids are medium salinity and medium-density.
Research on Cultivation Model for Logistics Talents of Universities in Ningbo: A Case Study of Zhejiang Wangli University
Authors: Zhong Xiao Jun , Li Ping , Yin Jie
Published: August 2013

Ningbo have location advantages in the Zhejiang Ocean Economic Development Demonstration Area, which provide great development opportunity to the logistics industry of Ningbo, but also it is a challenge to Ningbos logistics services ability. Innovative logistics talents are the key factors in overcoming difficulties in logistics industry development. The paper investigates the present situation of national logistics personnel training, and also the existing problems are analyzed, and then innovative logistics talents cultivation model of Ningbo is intensively and deeply studied. At last a trinity innovative logistics personnel training mode of Zhejiang Wanli University (ZWU) is put forward.
The Impact of Technological Regimes on the Establishment of Technological Standards
Authors: Mei Yuan Qing , Peng Xun Yi , Cui Yan
Published: August 2013

According to the framework of Technological regimes theory, the Technological regimes can be decomposed into four-dimensional elements: technological opportunities, appropriation, cumulative nature of technological progress and knowledge-based features. We selected 25 groups of data from manufacturing industries in a certain province in 2006 and study the impact of four dimensional elements of technological regimes on the establishment of industry technological standards by the method of Logistic regression. The results show that each dimension of technological regimes affects establishment of the industry technological standards to a certain extent in different directions. The size of a firm and its market needs of new products should also be considered at the same time.
Geological Statistics Study on Grade Variations in Ore Body 1 of the Macheng Iron Deposit, East Hebei, China
Authors: Wang Ming Ge , Xu Jiu Hua , Sun Wen Guo , Li Zhan Fang
Published: August 2013

Variation function as a main analytical tool is used for geological statistic study on grade variation characteristics of different segments in ore body 1 of the Macheng iron deposit (MID). The results indicate that the main ore body is bounded with-500m elevation, the upper grade change meets void effect, the lower grade change accords with the characteristics of spheroidal variation function and the upper change is smaller than the lower one in the general grade change. Based on fitting the variation functions of separate grade changes in different areas, the upper area and the lower area, and combined with the parameter values of each variation function, it is thought that production exploration distances that are suitable for the upper and lower ore bodies are respectively 35m and 30m in the vertical direction.
Microbialites from the Upper Cambrian in the Tarim Basin, Northwest China: Implication for Depositional Environments
Authors: You Xue Lian , Zhu Jing Quan , Li Qing , Liu Ling , He Kai , Wu Shi Qiang
Published: August 2013

Microbialites from Penglaiba section, a well-exposed stratigraphic section in the northwestern area of the Tarim Basin are widely distributed throughout the Lower Qiulitage Formation of the Upper Cambrian. Stromatolites and thrombolites are recognized as the two major components. Thrombolites have two kinds of fabrics under the microscopy based on varying arrangements macroscopically, which are microbial reefs and clotted laminations. The microbial reefs are kind of round and irregular buildups with branched shapes and interconnection as frame, which played the major roles in protecting the other microbial structures against the tides and waves. Based on petrology, stratigraphy and micro-facies combination, depositional environments are indicated for varying water depths and energy. In addition, a model of peleaoenvironments is established in the Lower Qiulitage Formation. Both of thrombolites and stromatolites are associated in the subtidal zone, but in this sedimentary model, thrombolites deposited in the deeper water, in which this facies association is similar to what has happened in Bahamas.
Applications of Conventional Logs in Low Resistivity Contrast Tight Gas Reservoirs Identification
Authors: Liu Xiao Peng , Hu Xiao Xin , Zhang Xiao Ling , Xu Rui , Zhi Ling Ling
Published: August 2013

It’s a great challenge in identifying gas bearing formation from conventional logs in tight gas sandstones due to the low resistivity contrast caused by high irreducible water saturation. Based on the difference of the principles of three kinds of porosity logs (density, neutron and acoustic logs), three porosities difference method, three porosities ratio method, correlation of neutron and density logs and the overlap method of water-filled porosity and total porosity are introduced to identify tight gas bearing reservoirs. In gas bearing formations, the difference of three porosities is higher than 0.0, the ratio of three porosities is higher than 1.0, the correlation between density and neutron logs is negative, and the water filled porosities are lower than total porosities. On the contrary, in water saturated formations, the difference of three porosities is lower than 0.0, the ratio of three porosities is lower than 1.0, the correlation between density and neutron logs is positive, and the water filled porosities are overlapped with total porosities. Considering the complexity of in-suit formation, when the proposed identification criterion are mainly meet, the pore fluid should be determined, field examples show that the proposed techniques are applicable in tight gas formation identification.
Research on Character of Sandlayer in Heidimiao Oil Layer in Yingtai Area
Authors: Lv Gui You
Published: August 2013

Based on the division and correlation of sand groups in Heidimiao, synthesizing the information of 3D seism data, drilling data, logging data and core data, well ties profile, sandstone contrast diagram and oil reservoir profile are drawn in this article in a way of combining the data of logging and seism. Furthermore, spatial distribution rules of sandlayer in Heidimiao oillayer are expected to be analyzed in this article through the data of stratum thickness, sandstone thickness, the thickness ratio of sandstone to stratum, and porosity isogram. The rules are described as: the Heidimiao oil layer is thick in east and north but thin in the west and south as a whole. Little sandstone is found in H3 (Nen 2) but that is highly developed in H2 (Nen 3) and H1 (Nen 4) in which lenticular sandlayer can also be found. Sandstones in each oil group are developed with varying thickness, great depth difference and complex lateral connectivity. What’s more, sandstones in the research area manifest a decline in layers and thickness from east to west. The thinner and smaller-scale sandstones in the west have weak lateral connectivity but strong control of oil and water distribution, which results in the formation of concealed lithological reservoir uncontrolled by geological structure.
Sedimentary Microfacies Analysis of Xingbei 1-3 Zone in Daqing Oilfield
Authors: Yan Bai Quan , Ma Xue Jing , Yuan Li Hui , Jing Gui Pu
Published: August 2013

Putaohua reservoir is the principal producing formation in Daqing oilfield Xingbei block. The spatial distribution of single sand body is particularly important for the residual oil tapping in the middle-late stage of oilfield development. The paper studied sedimentary microfacies of Putaohua reservoirs in the zone, established high-resolution sequence stratigraphic framework of the area and a typical single sand body logging phase mode on the basis of logging features, finely portrayed single sand body type and spatial distribution on this basis to lay the solid geological foundation for oilfield subsequent residual oil tapping and provide a scientific geology guide.
The Distribution of Clay Minerals in the Middle 3rd Member of Shahejie Formation in Dongying Depression and its Main Controlling Factors
Authors: Liu Lian , Zhu Nian Hong
Published: August 2013

Clay minerals are widely distributed in the middle 3rd member of Shahejie Formation (Es3) in Dongying Depression. Based on the types, contents and combination features of clay minerals, this paper studies the transverse distribution regularities of clay minerals in this strata. Through the study, it can be found that the main types of clay minerals include kaolinites, illites, chlorites, illites/smectites. By adopting the single factor analysis method, the planar distribution of the main clay minerals is studied and the main controlling factors for the distribution of clay minerals are comprehensively analyzed. The research shows that different types of parent rocks determine the original components of clay minerals, warm and humid climate influences the weathering of clay minerals, sedimentary environment provides the condition for deposition and preservation, and diagenesis changes the components of parts of clay minerals.
Three Dimensional Fine Structure Modeling of Haqian1 Wellblock, in Northern Dzungaria Basin, China
Authors: Dong Chen Qiang , Ding Fang , Ren Wei Wei
Published: August 2013

Haqian wellblock has a very good prospect in Dzungaria Basin, as it developed many faults and some formations are truncated, the development situation of it is very complicated, in this paper, we applied 3D geological modeling method which is one of the most important technology methods in describing the underground development situation, to illustrate the intricate structure. This geological model involved computer modeling and visualization of geological fault in 3D, the type of data of geological faults based on geological exploration is analyzed, after the fault model and horizon model are built, a whole structure model is finally set up.
Characteristics of Lead and Zinc Polymetallic Deposit and Wall Rock Alteration Zoning in Luziyuan, Yunnan
Authors: Zeng Lei , Deng Ming Guo , Lv Chang Liang , Liu Wei
Published: August 2013

The lead and zinc polymetallic deposit in LuziYuan is an ultra-large type skarn deposit. The ore body originated from the interlayer crushed zone between the second and thrid section of stratum marble and slate (schist) interbedding of upper Cambrian series Shahechang group, the wall rock alteration is intensice in the diggings, and the alteration zoning is obvious. Through field geological investigation and data analysis, based on the petrography of alterated rocks and combined with catalog information of drilling, the wall rock alteration in the diggings of LuziYuan is divided into four alteration zones,which are in sequence: carbonate-quartz-chloritization zone; carbonate-quartz-skarn lithification zone; skarn-lead zinc ore mineralization zone; and skarn-pyritization zone. The forming of ore body is related to alterations such as skarn lithification, silicification, marmarization, magnetite, etc.
Analysis of Influencing Factors on Effective Radius of Drilling Gas Drainage
Authors: Xu Zun Yu , Zhang Yong Jiang , Yuan Ben Qing
Published: August 2013

According to the theory of gas flow in coal seams, and according to drainage standard and the other relevant laws and regulations, derived the calculating equation of efficient radium of drilling hole gas extracting in drill holes in coal seam and drill holes along seam. Efficient radium of drilling hole gas extracting was calculated, combining with field practice of coal seam named 1 in Xinji No. 2 coal mine, the comparison with efficient radium of drilling hole gas extracting tested in field. Analysis on influencing factors of efficient radium of drilling hole gas extracting, and obtain the influence law on the efficient radium of drilling hole gas extracting.
Effect of the Water Injection Pressure on the Permeability of Coal Body
Authors: Ma Hai Feng , Li Chuan Ming , Li Jia Zhuo
Published: August 2013

The paper studied the change of permeability of three different coal seam samples at different injection pressure by using the MYS-I type permeability measuring system of coal and rock samples, according to the problem of the coal permeability highly affected during the seepage process, and also researched the water pressure distribution at the pressure of 4 MPa, 8MPa, and 12MPa based on COMSOL Multiphysics. The results show the permeability of coal samples gradually increases with injection pressure increasing and meets a cubic polynomial variation. The injection pressure range obeys a distribution, water pressure gradually decreases with increasing distance from the hole wall at the constant pressure, the flow velocity also reduces. The injection pressure gradient and the effective range gradually increases with injection pressure increasing, the pressure gradient gradually decreases with increasing distance from the hole wall, the maximum coverage radius of water injection pressure range is about 9.5m.
Estimation of In Situ Stresses by Using Hydraulic Fracturing and Welllogging Data in Shizhuangnan Coalbed Methane Field
Authors: Liu Zhi Qiang , Xing Li Ren , Liu Ru Min
Published: August 2013

This paper focuses on the research of the vertical and regional distributions of stress characteristics in the Shizhuangnan coalbed methane field, southeastern Ordos basin. The minimum and maximum horizontal stresses were firstly calculated by the breakdown pressure, closure pressure and tensile strength of the fracturing data of key wells. Then the calculated results are compared with the results calculated from the natural gamma-ray, density and acoustic logging data and Anderson’s Model. Based on the comparison, the residual stress in the Anderson’s Model is corrected. By adding the residual stress data in the Anderson’s Model, the modified model can be well used for evaluating the stress characteristics in the area with complex structure types. Finally, the distribution of stress characteristics in the Shizhuangnan coalbed methane field were evaluated by using the modified Anderson model.
Numerical Simulation for Shear Characteristics of Rock-Mass Structural Plane
Authors: Yuan Bao Yuan , Wang Qi , Lu Hai Feng
Published: August 2013

The characteristics of structural plane are very important to the stability of rock mass.In this paper,the stress and deformation characteristics of structural plane under direct shear conditions are analyzed based on FLAC3D code.And the influence of structural plane inhomogeneity to shear test was discussed.The results obtained in this paper indicate that, with the increase of normal stress, the shear strength of structural plane is constantly increasing,and the tow of them presents linear feature significantly. The normal displacement and shear displacement increase with the rise of the normal stress too. The peak shear strength increases gradually on the condition of uneven friction angle in the interface. This situation changes smaller when the discrete degree of friction angle is small. The peak shear strength increases significantly when the discrete degree of friction angle is big,and the stress-displacement curve exhibits a nonlinear characteristics before yield.
Formation Age of the Qinling Complex and the early Paleozoic Tectonic Event
Authors: Shi Yu , Liu Xi Jun , Feng Zuo Hai
Published: August 2013

The Qinling orogenic belt (QOB) located between the North China Craton (NCC) and the South China Craton (SCC) is composed of the Northern Qinling Belt (NQB) and the Southern Qinling Belt (SQB). This study presents new geochemical data, zircon U-Pb ages and Hf isotopes from two rocks from the Qinling complex in the NQB. LA-ICP-MS zircon U-Pb dating results suggest that the Qinling complex was formed in early Neoproterozoic and experienced the early Paleozoic metamorphism. High εHf(t) values of 9.0-12.0 for the early Paleozoic zircons indicated that there is mantle-derived magma intruding into the Qinling complex in the early Paleozoic.
Statistical Analysis on Characteristics of Gas Emission in a Fully Mechanized Caving Face under Drainage Conditions
Authors: Li De Wen , Wang Peng , Zhang Jing Zhao
Published: August 2013

Characteristics of gas emission in face 40108 were analyzed. The results show that the high-position tunnel system and the grouting system are the effective gas control systems, and 83% gas emission rates in face 40108 come from gob. When monitoring points away from coal face about 33-38m and 78-93m in strike direction, gob gas concentrations reach to 5% and 10%, respectively. The relative gas emission rates decrease with a negative exponential function when the daily outputs or daily advancing rates increase. With the increased air flow rate in face 40108, the absolute gas emission rates in return airway increase coinstantaneous, while it is almost remain unchanged in coal face.
Study on Characteristics of Energy for Hard Roof Fracture in Island Workface
Authors: Pang Xu Feng , Zhang Ke Xue
Published: August 2013

According to the characteristics of the island workface with hard roof, various mechanical models of hard roof in island workface are established, to analyze energy characteristics of hard roof before and after the first fracture in island workface with all round gobs, derived their simplified formulas of bending strain energy for hard roof before and after the first fracture, and using these formulas to estimate the bending strain energy for the typical case of coal bump, reveals the energy cause of coal bump and verify the validity of these formulas.
Experimental Study on Spectrum Characteristic of AE during Brittle Rock Fracture under Uniaxial Compression Based on Welch
Authors: Wu Xian Zhen , Liu Jian Wei , Liu Hong Xing , Liu Xiang Xin
Published: August 2013

Acoustic emission (AE) phenomenon will occur during the production and propagation of internal cracks, and failure in brittle rock. Under uniaxial loading, the complete stress-strain curves and waveform data were obtained. The Welch spectrum estimation and Cubic spline interpolation method were used to analyze the evolution of F, R values (peak frequency, energy percentage) of AE. The results show that F-values are maintained at 100±20kHz, and the peak points of F and R above 25% which can be used as a precursor to rock failure that their waveform are burst-type. The combined analysis of stress and F, R supplies a more accurately method of predicting the occurrence of rock burst.
Research and Application of Phase Space Reconstruction Theory in the Prediction of Slope Failure
Authors: Wang Chuang Ye , Ji Hong Guang , Han Wan Dong
Published: August 2013

The research of slope failure, which is one of the main types of natural disasters, has become a hot topic. Effective landslide forecast can improve the early warning system of landslides and mitigate the landslide disasters. In this paper, a predictive model with the slopes displacement time sequence is established based on the phase space reconstruction theory, where the parameter of the predictive model is obtained by the minimum of prediction error method. The rationality of the evaluation index system is verified through the case studies.
Research of Large-Area Hard Roof Caving Prevention and Control System in Shortwall Mining Face
Authors: Zang Chuan Wei , Zhuang Xuean , Ma Chuan Le
Published: August 2013

In the mining process, if the roof is very hard, it will hang in a large area in the gob. The hanging roof may cave suddenly, which will crash the mining face and generate hurricanes so as to cause casualties and equipment damage. The hard roof control technology has mainly been used in the longwall mining face in coal mines for a long time, and made little use in shortwall mining face. The factors of roof caving is analyzed in shortwall mining area, which mainly consists of the coal pillar size and layout, the length of coal face, roof thickness and strength, the overburden load, the supporting conditions of roof and so on and the relationship of the factor and the limit caving area is studied. And then a new integrated control technology system is put forward, which includes: support and isolation by coal pillars, roof caving pressure relief, monitoring and early warning of roof fall, gob sealing by the stopping walls, and the principle of different technology and the parameter selection method is claimed. This technology is applied in Shangwan Mine of Shendong Group in China and the results shows that the hard roof caves naturally in small area, the hidden danger of large-area roof caving is eliminated completely, so the coal production is guaranteed to be safe.
Study on Pipeline Self-Flowing Transportation of Cemented Tailing Fill Slurry Based on Fluent Software
Authors: Yu Gen Bo , Yang Peng , Chen Zan Cheng , Men Rui Ying
Published: August 2013

The related calculation analysis and numerical simulation is the basis of filling pipeline design and installation. Based on characteristics testing of the filling material, the related calculation was performed on the filling slurry gravity transport by pipelines. Chosen pipeline whose diameter was 75 mm, the natural flowing speed can reach 2.6 m/s on condition of the highest concentration for 65%, which is greater than the critical velocity and can meet the needs of the production of the mine. Numerical simulation research shows that the flowing speed of system was relatively ideal, slurry flow rate of bend place has great change while pressure uniformity in the rest parts, and the pressure loss is 0.8 MPa. Therefore, it is capable to achieve gravity flow transporting.
The Research on the Evaluation and Warning Model of Mining Industries' Security
Authors: Xie Li , Xie Yi Wen , Yang Ke Wei
Published: August 2013

This paper establishes the early warning index system for the security of Chinese mining industry. After that, this paper measures the safety situation of mining sub-industries during 2002-2009 by the combination of Information Entropy and Grey Theory. The research results show that during 2002-2009, the mining sub-industries are safe, except in 2002. Then, it simulates and forecasts the safe results of mining sub-industry by building a model based on the back-propagation network method. The results also show that the model is suitable for the results of the early warning outcome and applicable to forecast the security of mining sub-industry.
The Theory and Practice of Forepoling Pre-Stressed System Bolt in Preventing the Rib Spalling
Authors: Liu Hai Yuan , Jia Hou Sheng , Fan Long , Han Bin
Published: August 2013

Based on the particularity of loose and broken of the surrounding rock of roadway, there will be rib spalling after excavating of roadway without support problem. Through analyzing for the specific reasons of the rib spalling, the theory of forepoling pre-stressed system and forepoling support project were put forward. The broken rock zone test in normal roadway support indicating that this technology can effectively prevent the rib spalling before and after digging, having good supporting effect and economic benefits.
Preparation and Application of the Integrative Hydraulic Drilling and Reaming Completely Technology
Authors: Cao Jian Jun , Zhang Yong Jiang , Xu Zun Yu , Yuan Ben Qing
Published: August 2013

The effect of gas extraction would be significantly increased by the way of coal section drilling hole diameter expansion. For the existing technical problems and limitating of constructing large diameter borehole directly or using the reaming way of SKP high pressure water jet, and based on heterogeneous crushing mechanism of high pressure water jet, the integrative hydraulic drilling and reaming completely technology is proposed, the system structure of the technology is researched, the main equipments are integrative selected, and the process characteristics and application prospect of the technology are concluded. The results show that the integration technology of the integrative hydraulic drilling and reaming obvious improves the permeability of coal, promotes gas release, realizes continuous drilling between coal and seam and carried out simultaneously with drilling and reaming. It could significantly increase reaming efficiency and adaptability of evil working condition, which has important popularized and applied values.
Study on Exploiting and Utilizing Technology of Certain Middle-and-Low-Grade Bauxite
Authors: Chen Xiao Qing , Yang Jin Zhong , Mao Yi Lin , Yan Wei Ping
Published: August 2013

Taking a middle and low grade bauxite sample in Chongqing as the research object, the processing experiment research separated and enriched the low-grade raw ore to provide higher grade raw material for alumina production, which consequently ascertain proper processing technology solutions, increases concentrate grade and recovery, and provides technological basis for the development and utilization of bauxite resources in the district. The experiment recommends the process of "selective grinding grading of coarse and fine particle - direct flotation", and the technological indexes of closed circuit flow test are A/S 8.23 and recovery 91.42%.
Study on Mineral Processing Technology of Unutilizable Lead-Zinc Mixed Ore
Authors: Chen Xiao Qing , Yang Jin Zhong , Mao Yi Lin , Yan Wei Ping
Published: August 2013

The detailed research and analysis of ore properties was conducted on a certain unutilizable lead-zinc mixed ore in Yunnan, China, and in view of the ore properties, the sulfide ore and oxidized ore were graded, separated and enriched respectively, correspondingly, zinc concentrate, lead-zinc concentrate and lead oxide concentrate were produced, in addition, associated silver mineral was enriched in lead-zinc concentrate and lead oxide concentrate. On the basis of mineral separation technology study of polymetallic ore, the complex and inseparable lead-zinc ore and its associated mineral resources were recovered and utilized comprehensively.
Research on Design of Intelligent Building Internal Structure Based on Building Materials
Authors: Han Ze Yuan , Zhang Ning , Wu Zhe Cheng , Lu Yue Ming
Published: August 2013

New building materials cover a very wide area, such as insulation materials, high-strength materials, breathing material. Intelligent building is the inevitable product of new building materials in the information age, and the level of intelligence of the building gradually increases with the development of science and technology. This paper presents a novel intelligent building design. In the intelligent building, a wireless sensor networks can be reliable perception of the regional environmental and some parameter information be known by the monitoring nodes that widely distributed in the area. This design has the safe, efficient, comfortable, convenient and flexible features.
Research on Construction Materials with Innovation Strategies for Regional Architecture Renovation
Authors: Li Jiao
Published: August 2013

It is the starting point and end-result of regional architecture renovation to preserve historical and cultural features of regional architecture. This paper, from the perspective of construction materials, studied and analyzed principles and methods of regional architecture renovation and tried to bring new thought and inspiration to regional architecture renovation through the combination of new and old construction materials, restructuring, spatial switching and technical breakthrough.
Mechanical Properties Research of Steel-Concrete Composite Structure's Connector
Authors: Si Xiu Yong , Zhao Jian Bo , Bai Xiang Zhong
Published: August 2013

A new type of PBL shear connector gets more attention with the rapid development of steel-concrete composite structure. The PBL shear connector's static behavior and influence factors thereof are analysed through experiments. The PBL shear connector's force-transmission mechanism is discussed. The conclusions show that the thickness of perforate plate has significant impact of PBL shear connectors design bearing capacity, shear stiffness and ultimate bearing capacity. According to the thickness of perforate plate, the failure mode of PBL shear connector may appear to flexural and shear failure of perforate rebar, shear failure of perforate rebar or shear failure of perforate plate.
Preparation and Characterization of Calcium Sulfate Spherical Particles for Dentistry
Authors: Yan Ting Ting , Wu Xiao Pei , Leng Chong Yan , Chen Qing Hua
Published: August 2013

In this article, calcium sulfate spherical particles were prepared to be used in alveolar bone defect repairing. We used α-calcium sulfate hemihydrate powder to prepare spherical particles of calcium sulfate with stir pelletizing method. The effect of powder addition, pelletizing time and concentration of water-glass on properties of the spherical particles were studied. It was indicated that with increasing of the powder addition, the particle size of the spherical particles was decreased. Prolonging the pelletizing time can improve the compression strength in certain conditions. With increasing of the concentration of water-glass used in preparation process, the shape of the spherical particles becomes non-circular, the granulous stem yield was decreased and the compression strength of the spherical particles was improved.
Preparation of Reactive Powder Concrete Having High Volume of Phosphorous Slag Powder and Silica Fume
Authors: Sun Heng , Peng Yan Zhou , Tang Jun Feng , Li Nian
Published: August 2013

As an ultra-high performance concrete, reactive powder concrete (RPC) has broad practical application prospects. In this paper, phosphorus slag (PS) powder is utilized as one reactive component to prepare RPC. The effect of the PS content and water-binder ratio on the strength (flexure and compression) of concrete mixtures containing PS and silica fume (SF) is investigated. The results show that utilization of PS powder and SF in RPC production is feasible. RPC samples whose content of PS was about 30%-35% (by weight of binder) and water-binder ratio (W/B) was 0.16 were prepared after they had been cured at 95°C for 3 days. The compressive and flexural strength of those samples was 21.2 MPa and 142.2 MPa respectively.
Study on Automation Control with Noise Control of Oil Sucking Machine
Authors: Liu Huan , Cui Han
Published: August 2013

Sound insulation encasing is an effective device for noise reduction. The paper used the electric machine and reductor of oil sucking machine as an example, a controlling approach of installing sound insulation encasing has been found based on a analysis of noise characteristic, at the same time, the effectiveness of sound insulation encasing is analyzed, after establishing finite element models by using sysnoise software, and the deficiency of noise reducing effectiveness in local domain is shown. Effectiveness of noise reducing is better and meets the technical requirement, after amendment design, and this provides some reference to solve practical problem.
Research on Mechanical Automation with Vehicle’s Reconstruction Analysis Model of Offset Collision Accidents
Authors: Cao Yi , Zuo Zhong Yi
Published: August 2013

In order to provide a theory algorithm and a mechanical automation process for simulation and reconstruction analysis of offset collision accidents, the application limitation of traditional one-dimensional collision dynamics model was summarized, on the basis of analysis. Using the principles of classical mechanics and mechanical automation, the collision dynamics model and movement trajectory model of automobile offset collision were constructed. Using the model above and PC-Crash mechanical automation software, a real accident case was analyzed. The comparative study between the reconstruction analysis results and the vehicle’s traces remained in the accident scene was conducted. The comparative analysis showed that, the turning trajectories of automobiles were consistent with the trajectories remained in the accident scene. The model is suitable for small eccentric offset collision accidents.
Ab Initio Study of the Ge3N4 Semiconductor Materials in its Cubic γ Phase: A Computer Simulation
Authors: Xu Chao , Chen Dong
Published: August 2013

The structural and elastic properties of the cubic spinel Ge3N4 semiconductor have been investigated using the ab initio scheme within the generalized gradient approximation in the framework of density functional theory. Quantities such as lattice constants and elastic constants of interest are calculated. A good agreement is found between our results and the other data. Through the lattice dynamics, in which the finite displacement method is used, we have obtained successfully the thermal properties such as the phonon curve, free energy, heat capacity and Debye temperature in the whole temperature range from 0 to 1000K. It is the authors ambition that these results will inspire further experimental study on the Ge-based semiconductors. * Corresponding author: CHEN Dong
Study on Materials Selection and Construction of Digital Language Lab Based on Properties of Electronic Materials
Authors: Xi Qiang Yi
Published: August 2013

Nowadays, the traditional analog language lab is being replaced by the digital language lab, in which the transfer of data between the network and the terminal is realized through the standard network protocol and the data transmission quality has met the requirements in language training. However, how to utilize present resources and set up standard digital language labs needs more researching. This paper mainly deals with the materials selection and the construction of the digital language lab based on properties of electronic materials, and thus provides reference to set up more efficient and more effective language labs.
Transport Property Analysis of a Microencapsulated Phase Change Material Suspension with Material Properties
Authors: Fang Wen Bo , Xue Yi Bing
Published: August 2013

The transport properties of microencapsulated phase change material (MPCM) suspension are helpful for selection of components in the MPCM suspension transport system. The properties of MPCM sample are investigated theoretically. Transport property of MPCM suspension, especially pressure drop in pipe system, has been identified by theoretical analysis. The experimental researches in transport capability and power consumption of MPCM suspension are investigated as well.
Tensile Test of Composite Laminates and Specimen's Improvement
Authors: Wang Man , Bai Rui Xiang , Wang Ru
Published: August 2013

To obtain the material parameters for the composite laminate structure based on the general strength theory and failure criterion, a series of strength experiments are required to be carried out for some typical laminated fiber reinforced composite laminate plate. Due to complexity of stress state of specimen, some unexpected failure modes will often appear in the tensile test process of composite laminated plate. In this paper, according to the tensile test, the analysis for the failure mechanism of the specimen was executed by using finite element method. The suggestion for suitable geometry of the specimen was put forward, and the experimental results proved that the improvement for the specimen design was effective, thus the success rate of test was improved.
Mild Dehydration and Cycling Performance During 5-Kilometer Hill Climbing
Authors: Bardis Costas N. , Kavouras Stavros A. , Arnaoutis Giannis , Panagiotakos Demosthenes B. , Sidossis Labros S.
Published: August 2013

Context:

Hydration has been shown to be an important factor in performance; however, the effects of mild dehydration during intense cycling are not clear.

Objective:

To determine the influence of mild dehydration on cycling performance during an outdoor climbing trial in the heat (ambient temperature = 29.0°C ± 2.2°C).

Design:

Crossover study.

Setting:

Outdoor.

Patients or Other Participants:

Ten well-trained, male endurance cyclists (age = 28 ± 5 years, height = 182 ± 0.4 cm, mass = 73 ± 4 kg, maximal oxygen uptake = 56 ± 9 mL·min−1·kg−1, body fat = 23% ± 2%, maximal power = 354 ± 48 W).

Intervention(s):

Participants completed 1 hour of steady-state cycling with or without drinking to achieve the desired pre-exercise hydration level before 5-km hill-climbing cycling. Participants started the 5-km ride either euhydrated (EUH) or dehydrated by −1% of body mass (DEH).

Main Outcome Measure(s):

Performance time, core temperature, sweat rate, sweat sensitivity, and rating of perceived exertion (RPE).

Results:

Participants completed the 5-km ride 5.8% faster in the EUH (16.6 ± 2.3 minutes) than DEH (17.6 ± 2.9 minutes) trial (t1 = 10.221, P = .001). Postexercise body mass was −1.4% ± 0.3% for the EUH trial and −2.2% ± 0.2% for the DEH trial (t1 = 191.384, P < .001). Core temperature after the climb was greater during the DEH (39.2°C ± 0.3°C) than EUH (38.8°C ± 0.2°C) trial (t1 = 8.04, P = .005). Sweat rate was lower during the DEH (0.44 ± 0.16 mg·m−2·s−1) than EUH (0.51 ± 0.16 mg·m−2·s−1) trial (t8 = 2.703, P = .03). Sweat sensitivity was lower during the DEH (72.6 ± 32 g·°C−1·min−1) than EUH (102.6 ± 54.2 g·°C−1·min−1) trial (t8 = 3.072, P = .02). Lastly, RPE after the exercise performance test was higher for the DEH (19.0 ± 1.0) than EUH (17.0 ± 1.0) participants (t9 = −3.36, P = .008).

Conclusions:

We found mild dehydration decreased cycling performance during a 5-km outdoor hill course, probably due to greater heat strain and greater perceived intensity.
Sport and Team Differences on Baseline Measures of Sport-Related Concussion
Authors: Zimmer Adam , Piecora Kyle , Schuster Danielle , Webbe Frank
Published: August 2013

Context:

With the advent of the National Collegiate Athletic Association's (NCAA's) mandating the presence and practice of concussion-management plans in collegiate athletic programs, institutions will consider potential approaches for concussion management, including both baseline and normative comparison approaches.

Objective:

To examine sport and team differences in baseline performance on a computer-based neurocognitive measure and 2 standard sideline measures of cognition and balance and to determine the potential effect of premorbid factors sex and height on baseline performance.

Design:

Cross-sectional study.

Setting:

University laboratory.

Patients or Other Participants:

A total of 437 NCAA Division II student-athletes (males = 273, females = 164; age = 19.61 ± 1.64 years, height = 69.89 ± 4.04 inches [177.52 ± 10.26 cm]) were recruited during mandatory preseason testing conducted in a concussion-management program.

Main Outcome Measure(s):

The computerized Concussion Resolution Index (CRI), the Standardized Assessment of Concussion (Form A; SAC), and the Balance Error Scoring System (BESS).

Results:

Players on the men's basketball team tended to perform worse on the baseline measures, whereas soccer players tended to perform better. We found a difference in total BESS scores between these sports (P = .002). We saw a difference between sports on the hard-surface portion of the BESS (F6,347 = 3.33, P = .003, ηp2 = 0.05). No sport, team, or sex differences were found with SAC scores (P > .05). We noted differences between sports and teams in the CRI indices, with basketball, particularly the men's team, performing worse than soccer (P < .001) and softball/baseball (P = .03). When sex and height were considered as possible sources of variation in BESS and CRI team or sport differences, height was a covariate for the team (F1,385 = 5.109, P = .02, ηp2 = 0.013) and sport (F1,326 = 11.212, P = .001, ηp2 = 0.033) analyses, but the interaction of sex and sport on CRI indices was not significant in any test (P > .05).

Conclusions:

Given that differences in neurocognitive functioning and performance among sports and teams exist, the comparison of posttraumatic and baseline assessment may lead to more accurate diagnoses of concussion and safer return-to-participation decision making than the use of normative comparisons.
Sex reversal in the dageraad Chrysoblephus cristiceps (Pisces: Sparidae)
Authors: Robinson G. A.
Published: August 2013

This paper reports protogynous hermaphroditism in the dageraad Chrysoblephus cristiceps. Mass-length relationships indicate growth changes in male and female fish. Seasonal maturity in dageraad, and hermaphroditism in South African sparid fish are discussed. A regulatory measure for the conservation of dageraad is proposed.
A note on mountain reedbuck Redunca fulvorufula fulvorufula Afzelius in the Kruger National Park
Authors: Irby L. R.
Published: August 2013

This survey was conducted to obtain information on the mountain reedbuck population in the Kruger National Park for comparison with the population in the Loskop Dam Nature Reserve, Transvaal. During 93 hours of search effort, 36 mountain reedbuck sightings were recorded. All of the sightings were in the Malelane Hills on slopes above the Kwa Machiyaliwane drainage.
A survey of the mammals occurring in the Golden Gate Highlands National Park
Authors: Rautenbach I. L.
Published: August 2013

This paper reports on a survey of the mammals of the Golden Gate Highlands National Park, Republic of South Africa. Fifty-seven species are mentioned, the majority recorded through material or sight records. Those species which may occur in the Park, as deducted from their overall distribution ranges, or from other indirect observations such as spoor or droppings, are considered as well. Habitat preferences are mentioned wherever possible, and the conservation status and relocation histories of the antelope species are quoted.
Notes on mammals encountered in the Tsitsikama National Parks
Authors: Robinson G. A.
Published: August 2013

Data and observations on mammals collected since the proclamation of the Tsitsikama National Parks in 1964, are presented.
Additions to the check-list of birds of the Mountain Zebra National Park
Authors: Penzhorn B. L. , Bronkhorst P. J. L.
Published: August 2013

Twenty-two additional bird species have been recorded in the Park, increasing the check-list total to 170 species.
A case of abomasal impaction in a captive giraffe (Giraffa camelopardalis)
Authors: Gradwell D. V.
Published: August 2013

A male giraffe calf was brought into the experimental pens at Skukuza after being found on its own in poor condition in the Kruger National Park, Republic of South Africa. The mother of the calf could not be traced.
Initial experience with Angioseal™ : Safety and efficacy of the endovascular closure device
Authors: Modi Sachin , Gadvi Rakesh , Babu Suresh
Published: August 2013

Background: Vascular access site management is crucial to safe, efficient, and comfortable diagnostic or interventional percutaneous procedures. The Angioseal™ vascular closure device has been shown to be safe and effective in reducing the time to hemostasis following angiographic or interventional procedures. Relatively few studies have been conducted in the UK to assess the safety and efficacy of the device in a local setting. Materials and Methods: Data were retrospectively reviewed on 147 patients who underwent either diagnostic angiography or percutaneous interventional procedures from January 2008 to October 2009, and who had the femoral access site closed by 6F VIP Angioseal. A total of 147 patients (F: 49, M: 98), including 80 right femoral punctures, 57 left femoral punctures, and 10 bilateral punctures were reviewed using radiological reports and patients′ clinical data. Data on antiplatelet and anticoagulant therapy were recorded. All procedures were carried out by two interventional radiologists at a single institution, under similar operating conditions. Results: There were a total of six complications (4.47%), of which one was a major complication (0.75%), i.e., retroperitoneal bleed. There were five minor complications (3.73%), which included device deployment failure (2), device malfunction (2), and a superficial hematoma (>6 cm). Total complications were 6 out of 157 (3.8%) [95% CI = 0.8-6.8%)]. Successful hemostasis was achieved in less than 5 min in over 97% of patients. Successful device deployment was seen in over 98% of cases. Conclusion: We conclude that in our experience, the Angioseal vascular closure device is a safe and efficient means of achieving hemostasis post antegrade or retrograde puncture for diagnostic and percutaneous intervention procedures.
MR enterography in children: Principles, technique, and clinical applications
Authors: Chavhan Govind B , Babyn Paul S , Walters Thomas
Published: August 2013

MR enterography is a constantly advancing technique for assessment of bowel with newer technology and sequences. It is being increasingly used for the assessment of inflammatory bowel disease and has almost replaced barium follow through examinations in many institutions. Its lack of radiation makes it an attractive alternative for bowel evaluation in children. It has been proved to be highly sensitive in the detection of Crohn disease in adults and children. It is also superior to barium studies in showing extra-enteric findings and detecting complications such as fistulas and abscesses. Even though at present it is almost exclusively used for the evaluation of inflammatory bowel disease, it has the potential to be used in other conditions affecting the bowel. The principles, MR enterography technique pertinent to children, and its utility in the assessment of Crohn disease in children are discussed in this review.
Cystic adventitial disease of popliteal artery with significant stenosis
Authors: Gupta Ranjana , Mittal Puneet , Gupta Praveen , Jindal Nancy
Published: August 2013

Cystic adventitial disease of popliteal artery is a rare condition of unknown etiology which usually presents in middle-aged men. We present Doppler and computed tomography angiography findings in a case of cystic adventitial disease with significant obstruction of popliteal artery, with secondary narrowing of popliteal vein.