bluuebunny/crossref_metadata_2025 huggingface dataset:
The Challenge of Parenting Girls in Neighborhoods of Different Perceived Quality
Authors: Ahonen Lia , Loeber Rolf , Hipwell Alison , Stepp Stephanie
Published: August 2014

It is well-known that disadvantaged neighborhoods, as officially identified through census data, harbor higher numbers of delinquent individuals than advantaged neighborhoods. What is much less known is whether parents’ perception of the neighborhood problems predicts low parental engagement with their girls and, ultimately, how this is related to girls’ delinquency, including violence. This paper elucidates these issues by examining data from the Pittsburgh Girls Study, including parent-report of neighborhood problems and level of parental engagement and official records and girl-reported delinquency at ages 15, 16, and 17. Results showed higher stability over time for neighborhood problems and parental engagement than girls’ delinquency. Parents’ perception of their neighborhood affected the extent to which parents engaged in their girls’ lives, but low parental engagement did not predict girls being charged for offending at age 15, 16 or 17. These results were largely replicated for girls’ self-reported delinquency with the exception that low parental engagement at age 16 was predictive of the frequency of girls’ self-reported delinquency at age 17 as well. The results, because of their implications for screening and early interventions, are relevant to policy makers as well as practitioners.
Evaluation of the Effectiveness of Border Policies in Dehong Prefecture of Yunnan, China
Authors: Bie Qianlong , Li Cansong , Zhou Shangyi
Published: August 2014

With the process of globalization, many political geographers and research institutions have begun to focus on borders and border areas. Faced with the current debate on the border policies, this paper reviews the former research relating to border studies and provides an evaluation of China’s border policies. The literatures on border effects reveal that national boundaries have a significant impact on the economic, social and cultural relations of both border regions. Because of these effects, each country has to adjust its border policies in different periods. In this paper, a perspective is provided for evaluating the effectiveness of China’s border policy based on the Kaldor-Hicks analysis method. We investigated the border policies in Dehong Autonomous Prefecture in Yunnan province of China from 1949 to 2012, and evaluated the effectiveness of the border policy using the Kaldor-Hicks method. The conclusions include: first, the Kaldor-Hicks method can be seen as effective method to evaluate the effectiveness of China’s border policies. Second, based on the Kaldor-Hicks method, we observe the overall effects of the adjustments made to the border policies in Dehong Prefecture were positive. However, sometimes the border trade policy is good for the country as a whole, but not necessarily for Dehong Prefecture. For the sake of the whole country, adjustments in border trade policy need to be compensated by financial transfer payments. In addition, the combined effects of the cross-border marriages policy are not immediately obvious.
Antigenic Properties of N Protein of Hantavirus
Authors: Yoshimatsu Kumiko , Arikawa Jiro
Published: August 2014

Hantavirus causes two important rodent-borne viral zoonoses, hemorrhagic fever with renal syndrome (HFRS) in Eurasia and hantavirus pulmonary syndrome (HPS) in North and South America. Twenty-four species that represent sero- and genotypes have been registered within the genus Hantavirus by the International Committee on Taxonomy of Viruses (ICTV). Among the viral proteins, nucleocapsid (N) protein possesses an immunodominant antigen. The antigenicitiy of N protein is conserved compared with that of envelope glycoproteins. Therefore, N protein has been used for serological diagnoses and seroepidemiological studies. An understanding of the antigenic properties of N protein is important for the interpretation of results from serological tests using N antigen. N protein consists of about 430 amino acids and possesses various epitopes. The N-terminal quarter of N protein bears linear and immunodominant epitopes. However, a serotype-specific and multimerization-dependent antigenic site was found in the C-terminal half of N protein. In this paper, the structure, function, and antigenicity of N protein are reviewed.
Characterization of physical properties of tissue factor–containing microvesicles and a comparison of ultracentrifuge‐based recovery procedures
Authors: Ettelaie Camille , Collier Mary E. W. , Maraveyas Anthony , Ettelaie Rammile
Published: August 2014

Microvesicles were isolated from the conditioned media of 3 cell lines (MDA‐MB‐231, AsPC‐1 and A375) by ultracentrifugation at a range of relative centrifugal forces, and the tissue factor (TF) protein and activity, microvesicle number, size distribution and relative density compared. Also, by expressing TF‐tGFP in cells and isolating the microvesicles, the relative density of TF‐containing microvesicles was established. Nanoparticle tracking analysis (NTA) indicated that the larger‐diameter microvesicles (>200 nm) were primarily sedimented at 100,000g and possessed TF‐dependent thrombin and factor Xa generation potential, while in the absence of factor VII, all microvesicles possessed some thrombin generation capacity. Immuno‐precipitation of TF‐containing microvesicles followed by NTA also indicated the range of these microvesicles to be 200–400 nm. Analysis of the microvesicles by gradient density centrifugation showed that lower‐density (<1.1 g/ml) microvesicles were mainly present in the samples recovered at 100,000g and were associated with TF antigen and activity. Analysis of these fractions by NTA confirmed that these fractions were principally composed of the larger‐diameter microvesicles. Similar analysis of microvesicles from healthy or patient plasma supported those obtained from conditioned media indicating that TF activity was mainly associated with lower‐density microvesicles. Furthermore, centrifugation of healthy plasma, supplemented with TF‐tGFP‐containing microvesicles, resulted in 67% retrieval of the fluorescent microvesicles at 100,000g, but only 26% could be recovered at 20,000g. Pre‐centrifugation of conditioned media or plasma at 10,000g improved the speed and yield of recovered TF‐containing microvesicles by subsequent centrifugation at either 20,000g or 100,000g. In conclusion, TF appears to be associated with low‐density (1.03–1.08 g/ml), larger‐diameter (200–350 nm) microvesicles.
Application of cyclic phosphonamide reagents in the total synthesis of natural products and biologically active molecules
Authors: Focken Thilo , Hanessian Stephen
Published: August 2014

A review of the synthesis of natural products and bioactive compounds adopting phosphonamide anion technology is presented highlighting the utility of phosphonamide reagents in stereocontrolled bond-forming reactions. Methodologies utilizing phosphonamide anions in asymmetric alkylations, Michael additions, olefinations, and cyclopropanations will be summarized, as well as an overview of the synthesis of the employed phosphonamide reagents.
L'efficacité du système budgétaire : vers un découplage des activités de mesure et de pilotage de la performance
Authors: Mousli Morad
Published: August 2014

La recherche s’intéresse à l’efficacité du système budgétaire en matière de management et de pilotage de la performance. Elle s’appuie sur une méthodologie qualitative qui a pris la forme de l’étude du cas d’une entreprise industrielle française ayant opté pour un découplage des fonctions de mesure et de pilotage à partir d’un rattachement structurel idoine et de missions spécifiques pour les deux nouvelles catégories de contrôleurs. Les résultats montrent que le système est davantage enclin à participer à la mise en œuvre des actions d’amélioration au niveau opérationnel, notamment en raison de processus et d’outils nouveaux comme le Balanced Scorecard . L’activité de pilotage, au niveau opérationnel, reste néanmoins liée aux tâches de gestion et l’adaptation des contrôleurs dans leurs nouvelles attributions freine l’efficacité du système budgétaire, en raison du périmètre d’activité encore mal maîtrisé et de tensions inhérentes à leur rattachement hiérarchique.
Space Tourism
Authors: Goehlich Robert A.
Published: August 2014

According to the Space Policy Institute (2002, Bib. section), “Space tourism is the term broadly applied to the concept of paying customers traveling beyond Earth's atmosphere.” Operating reusable launch vehicles (RLVs) might be a first step toward achieving mass space tourism. Thus, the aim of this article is to investigate the potential hurdles and other aspects of importance that must be overcome in order to use RLVs for space tourism flights. The primary ones are social issues (e.g., “Is space tourism ethically acceptable?”), institutional issues (e.g., “Is environmental pollution caused by space tourism more harmful than other emission sources?”), and financial issues (e.g., “Are any potential investors interested in space tourism?”).
A 3D Virtual Space for the E-Commerce Strategy Model
Authors: Cheng Gong , Yu Changrui , Liu Kecheng
Published: August 2014

In recent years, innovative applications of electronic commerce (e-commerce) are facing the challenges of mobile commerce (m-commerce) and ubiquitous commerce (u-commerce). To address these challenges and improve the competitiveness of e-commerce, the three-dimensional e-commerce (3DEC) theory is proposed and a 3DEC business strategy model is built up in this study. The new conceptual 3DEC model incorporates the industrial environment analysis, SWOT analysis, and business model canvas (BMC). As a case demonstrated in the British Museum program, this model brings benefits to a wide range of organizations in public and private sectors, as well as e-commerce researchers and practitioners.
Research on the Evaluation and Selection of Third-Party Logistics Providers in B2C E-Commerce Mode
Authors: Huang Yijun , Yin Kaikai
Published: August 2014

For B2C e-commerce enterprises, it is of great importance to select the third-party logistics (3PL) providers. The paper, focused on the concept of “logistics capability”, took full account of the characteristics of B2C e-commerce and its logistics service and referred to the research findings of scholars. As a result, on six dimensions, the evaluation indexes of 3PL providers' logistics capability in the mode of B2C e-commerce were identified. Besides, Case studies were conducted with multi-index decision and evaluation methods based on Relative Approximation, showing that the final results are reliable.
Treating Effect of Potassium Ferrate to Aquaculture Recirculating Water
Authors: Zhang Dong Xia , Liu Qi , Zhang Yong Ming
Published: August 2014

Aquaculture waste water was a major sewage resource, and recirculating aquaculture is an important mode of aquaculture development. Potassium ferrate is a novel sewage treatment agent and the use of potassium ferrate as a aquaculture recirculating water purification agents had a very important significance in the theoretical and practical application. When the amount of potassium ferrate is 8mg / L, the removal rate of the total number of colonies is 98.8%, the removal rate of COD is 92.16%, 98.78%, and sulfide is 98.42%. For the total amount of ammonia and nitrite also has a certain effect, when the amount of potassium ferrate is 12mg / L, the nitrite removal rate was 44.61%, total ammonia nitrogen removal rate was 23.61%.
A Green Approach for Highly Reduction of Graphene Oxide by Supercritical Fluid
Authors: Kong Chang Yi , Shiratori Yuuki , Sako Takeshi , Iwata Futoshi
Published: August 2014

A green method to synthesize the reduced graphene oxide using supercritical fluid has been developed, which is an environmentally friendly and efficient route. The reduced graphene oxide has been examined by X-ray diffraction, Raman spectroscopy. We have also studied the effects of reduction temperatures and supercritical fluids on the electrical properties of reduced graphene oxide. It was found that ethanol has higher reducing capability than CO2 at all temperatures (200 - 400 °C) examined in this study for graphene oxide reduction. As a result, reduced graphene oxide (6300 S/m) from supercritical ethanol treatment has 5 times as high conductivity as that from supercritical CO2 treatment at the reduction temperature of 400 °C. This green process is applicable for large scale production of reduced graphene oxides for various practical applications.
Synthesis, Application of a Novel Halogen-Free Intumescent Flame Retardant Agent for Poplar Wood Veneer
Authors: Yu Wang Wang , Huang Tao , Lei Wen
Published: August 2014

A novel non-halogen intumescent flame retardant agent (IFR) was prepared by using phosphoric acid, pentaerythritol and aniline as raw materials, a flame-retardant poplar wood veneer was prepared by treating the veneer with IFR. The influence factors of flame retardant processing technology on poplar wood veneer were studied by the orthogonal experiment. Flammability of the veneer was investigated by Limit Oxygen Index (LOI) test. The optimal impregnated time, impregnated temperature and impregnated concentration of IFR treated poplar wood veneer were 3h, 80°C and 18% respectively, which can make the veneer get the highest LOI of 46.7%.
Experimental Study on a Combined Process of Anaerobic Filter, Anoxic, Oxic and Constructed Wetland for Rural Domestic Sewage Treatment
Authors: Ladu John Leju Celestino , Lu Xi Wu
Published: August 2014

The right combination and sequence of treatment methods is the key to the successful handling of rural domestic sewage. This research aim was to carry out experimental study on the combined process and assess its efficiency, feasibility, robustness and suitability for rural domestic sewage treatment and explore the best treatment effect and operating parameters. The parameter optimized and controlled includes hydraulic retention time (HRT) and temperature during the entire research operations. The average COD, TN, NH4+-N and TP removal efficiency of the combined process was 78.2%, 70%, 76% and 87% respectively. Overall, the combined process proved to be efficient and suitable for rural domestic sewage treatment.
Experimental Study on Roundness of High-Speed Cylindrical Grinding for 20CrMnTi Alloy Steel
Authors: Xiao Jun Min , Xie Jin
Published: August 2014

In order to reduce the roundness error of cylindrical grinding of shaft parts for 20CrMnTi alloy steel, the related experiments of high-speed cylindrical grinding are carried out and the influence of grinding parameters on roundness is analyzed. Based on the analysis of experimental data the conclusions are as follows: The influence of grinding wheel speed on work-piece roundness is not apparent, but the influence of work-piece speed and grinding depth on roundness is very significant. Based on high-speed grinding experiments the prediction model of cylindrical grinding for 20CrMnTi alloy steel is established by using of regression analysis method of least square. Based on the analysis of the roundness prediction model of cylindrical grinding the conclusions are as follows: The roundness error of cylindrical grinding parts will become lager with the increase of work-piece speed, grinding depth and grinding wheel speed.
Determination of EG Content in the Liquid Products of PET Hydrolysis under Microwave Irradiation
Authors: Zhong Ling , Jin Jia Mei , Zeng Cheng Cai , Yu Yu Wen , Zhang Dong
Published: August 2014

The determination of EG content in the liquid products of PET hydrolysis process under microwave irradiation at 170°C 180°C and 190°C was measured by Gas chromatography. The chromatographic column was quartz capillary chromatographic column the carrier gas was nitrogen hydrogen flame ionization detector FID. The result indicated that the concentration curves of EG didn’t follow a dynamic process which suggested that PET hydrolysis under microwave was not a continuous process dynamics.
Effect of Porosity on Compressive Properities of Porous Titanium with Helical Pores Structure
Authors: Sui Yan Fei , Zou Chun Ming , Tang Ying Qiao , Wang Hong Wei , Wei Zun Jie
Published: August 2014

The role of pores structure in porous titanium with helical pores was studied. The results showed that porosity of porous titanium depends on diameter of titanium fiber (d1), screw diameter (d2) and screw pitch (d3). With the increase of titanium fiber diameter, the decrease of screw diameter and screw pitch, the porosity of porous titanium decreases. Compressive yield strength and Young’s modulus increase with the decrease of porosity, and the final functional expression of compressive yield strength and Young’s modulus depending on porosity was given.
Forming Process Simulation and Optimization of Nickel-Base Superalloy Turbine Disk
Authors: Zhou Wan Lin , Chen Wen Hao , Zhang Fu Jun
Published: August 2014

Turbine disc is the key component of aviation engine, its performance is important to ensure the reliability and safety of the whole aviation engine. In this paper, forging forming of GH4169 alloy turbine disks of certain type aero-engine are discsimulated by DEFORM-3D soft system,these forming methods include next three kinds: common hot die forging, isothermal forging and composite sheath hot die forging.The influences of various forging ways on turbine disk forging quality and the used die are analyzed in order to find the most suitable way of forging. The forging defects in the forging process are analyzed . For basically eliminating these defects, the forging process of superalloy turbine disk are optimized based on the most economical and simple principles and some useful methds are gained，which will provide a reference to actual superalloy turbine disk forging process.
Microscopic Stress Analysis of Body-Centered Cubic Crystal under High Cycle Fatigue
Authors: Zhu Fu Xian , Zhou Jin Yu
Published: August 2014

Based on the constitutive equation of the orthotropic material, the relation between elasticity parameter and crystal orientation was analyzed. Finite element computation were carried out for simulating the stress of body-centered cubic crystal under high cycle fatigue, and after the analysis of the crystal stress, variation of the shear stress and normal stress on the slip plane were discussed depending on the angles between the crystal principal axis and the loading direction. The results show that, under high cycle fatigue, to the body-centered cubic crystal metal, the resolved shear stress on the slip plane reaches a maximum when the crystal principal axis approaches to the macro loading direction, and the calculated normal stress on the slip plane gets the maximum when crystal principal axis and the macro loading direction are inclined to 54 deg.
Research on Electrical Discharge Grinding Technics of Polycrystalline Diamond Compact Cutting Tool
Authors: Jia Yun Hai , Li Jian Gang , Chen Lin
Published: August 2014

Electrical discharge grinding is one of the most widely used method to machine polycrystalline diamond compact cutting tool. Polycrystalline diamond compact samples with different crystal granularity are the research object. Peak current, pulse width and pulse interval are chosen as the main process parameters. The material removal volume and electrode loss set as the evaluation index of productive efficiency; workpiece surface roughness value sets as an evaluation standard of processing quality. With electrical discharge grinding experiments, combined with scanning electron microscopy observation and roughness tester, the influences of the main process parameters on electrical discharge grinding are analyzed, polycrystalline diamond compact electrical discharge grinding process are summarized.
Standard Simple of Tin Bronze for Casting Develepment
Authors: Li Yan Song , Wang Da Wei
Published: August 2014

The development of standard simple of tin bronze for casting is presented,design of composition, selection melting temperature 1150 °C, put into 0.2m3/kg argon gas, stirring with 100rpm for 1min, keeping temperature for 30min as the optimum process conditions, coarse and fine tests of homogeneity with data analyses, determination of standard values and standard deviation. The homogeneity and standard values of samples meet the national standard GB/T15000 and YS/T409-1998. The standard sample series has ratification as National Reference Materials (GSB 04-2707-2011) by National Technical Commission on Reference Materials.
Study on Flatness Control Strategy of a Single-Stand Reversing Cold Rolling Mill
Authors: Bai Jin Lan , Pan Hong Zhi
Published: August 2014

In this paper, an integrated rolls system deformation calculation model is established based on the influence function method combining with pass schedule calculation, rolls wear and roll thermal deformation calculation, and the corresponding calculation procedure has been developed. Then the influence of work roll bending, work roll shifting and intermediate roll bending on transverse distribution of strip thickness, strip crown, quadratic flatness, and quartic flatness are analyzed with the procedure. According to the analysis result, flatness control strategy of the single-stand reversing cold rolling mill is determined. The flatness control strategy will provide the basis for flatness control presetting of the mill. The practical application shows that the flatness control strategy is suitable for flatness control of the single-stand reversing cold rolling mill.
3D FEM Simulation of Multipass ECAP Ti-50.8%Ni at Various Temperatures
Authors: Osman Mohamed , Zhang Dian Tao , Tong Yun Xiang , Zheng Yu Feng , Li Li
Published: August 2014

Equal channel angular pressing (ECAP) is widely studied for its potential to produce ultra-fine grained (UFG) structure in TiNi shape memory alloys (SMA). In the present work, the effect of multipass ECAP parameters on the deformation behavior and strain distribution was investigated, at various deformation temperatures through different planes in the ECAPed billet. Three-dimensional (3D) geometric model with corner angle 120◦ was designed by finite element method (FEM) software for ECAPing Ti-50.8%Ni by route Bc in DEFORM-3D software. Two methods were used to quantify deformation homogeneity through various planes in the processed billet, including strain standard deviation (SSD) and inhomogenity index (Ci). The simulation results demonstrate that by increasing ECAP passes, the cumulative average strain can increase and obtain UFG structure, but heterogeneity still exist across planes. In addition, temperature has a remarkable effect on homogeneity distribution .As well as Ci exhibits good results for multipass ECAP at various deformation temperature compared to SSD value.
A New Approach of Strip Steel Tempering and Straightening in Strip Rolling
Authors: Yu Ji Lai , Gu Ting Quan , Wang Jian Guo
Published: August 2014

This paper firstly analyzes the problems that exist in the cold rolling of steel industry. Secondly, a new approach is proposed to temper and straighten the strip steel based on the temper leveling mill, shortly, TLM. The required high quality of the wave, surface and mechanical properties can be achieved only with TLM. TLM holds the functions of both temper machine and straightening mill and can produce good quality strip steel, no only the waviness, mechanical properties, but also the surface quality. The usage of TLM can lower the cost of the production of tempering, straightening and equipment investment.Finally, the experiments are done and verify the validity of the approach.
An Automatic Control Strategy of Strip Width in Cold Rolling
Authors: Yu Ji Lai , Gu Ting Quan , Wang Jian Guo
Published: August 2014

This paper proposes an automatic control strategy of the strip width in cold rolling process. The prediction model for the exit strip width of each stand is established. In addition to the strip width variation of the incoming hot-rolled material between the measured and the pre-set values, the variations of the rolling force, tension, bending force and the roll shift amount of each stand are utilized to model and forecast the stand exit width deformation. Then, the model can be used to determine the compensation values of the different profile adjustment mechanism and the exit strip width can be controlled in high accuracy. In this way, the effect of the strip width variation of the incoming hot-rolled material and the fluctuation of the stand rolling process parameters on the exit strip width can be eliminated. Moreover, the feed-forward control of the strip width can reduce the incidence of abnormal situation, such as the strip breakage and off-tracking ,and improve the stability of the cold rolling process.
Microstructure and Properties under Alternating Magnetism after Hot Rolling
Authors: Zheng Shen Bai , Liu Shi Jie , Li Hong Bin , Feng Bin , Hui Xue Song
Published: August 2014

The austenite steel after rolling was radiated by the alternating magnetism, and the effects that alternating magnetic on the austenite transition was studied. The result shows that the alternating magnetism promotes the austenitic grain growth of low carbon steel. If the magnetic field intensity is increased, it could provide better performance of raw materials to cold rolling processing.
Numerical Simulation on Thermo-Forming Process of the Ultra High Strength Steel
Authors: Yan Bi , Xu Ma , Chen Meng , Guang Yang
Published: August 2014

Thermoforming is a typical method of ultra high strength steel plate’s forming for the automotive industry, where the 22MnB5 sheet is widely used. This article discusses how to simulate the thermoforming process of the 22MnB5 by using the thermal coupling software which is called Pam-stamp 2011. After that, we got the distribution of temperature、thickness and thinning rate of thermoforming parts.
Online Detection and Control of Strip Steel Mechanical Properties in Skin-Pass Process
Authors: Chen Yun Peng , Tang Cheng Long , Gu Ting Quan
Published: August 2014

Firstly, the online detecting and controlling models of the strip steel mechanical properties in skin-pass process are proposed in this paper. The models are used to overcome the shortage of the conventional monitoring methods, and to reduce the fluctuations of the mechanical properties of the strip. The new online detecting and controlling models can real-time forecast the mechanical properties of the running strip from the online monitoring devices. The bias control between the forecasting and the target values of the mechanical properties can be corrected by adjusting the strip elongation . As a result , the fluctuations of the mechanical properties of the strip are reduced ,and move over,it is helpful to prevent the higher yield strength and lower tensile strength, and to maintain good formability strip.The experiments are done and verify the validity of the approach.
Study on Tribological Performances of n-Na2B4O7/ion Nitrocarburized Duplex Layer at Different Temperatures
Authors: Hu C.H. , Deng Zhi Chang , Bian Bao Shan , Li Long , Wang Hai Tao
Published: August 2014

The paper studied the tribological performances of n-Na2B4O7/ion nitrocarburized duplex layer at different temperatures. It is found that the n-Na2B4O7/ion nitrocarburized duplex layer has more excellent friction reduction and wear resistance performances than the intermediate frequency quenched surface under CD15W-40 oil lubricating at different temperatures, especially at the higher temperature 100°C, the friction factor and volume loss of the duplex layer is 63% and 96% less than that of the intermediate frequency quenched surface respectively, which indicates that n-Na2B4O7/ion nitrocarburized duplex layer can play more excellent friction reduction, wear resistance and scuffing resistance performances at the relative higher temperature. This because that the chemical reaction films including oxide, BN and so on formed on the friction surface play the solid lubrication function, and the n-Na2B4O7 particles on the friction surface play the "Micron nanobearing" function.
Microstructure and Property Analysis of Furnace Pipe Used over a Design Cycle
Authors: Ma Li Feng , Gao Yi Min
Published: August 2014

The state analysis and evaluation of the furnace pipe including of riser pipe, collecting gas pipe run over service period by EPMA, dye penetration inspection, macro and microstructure analysis, mechanical properties at room and high temperature and high temperature rupture property. The results show that the chemical composition meets the technical requirements, Macro-and microstructure are good, corrosion of inside and outside surface is minor, the remaining life of pipe analyzed is longer by fitting extrapolation of data of rupture property in the L-M curve. It is good proposal to production enterprises that higher level of material is selected to reduce the wall thickness properly, expand the diameter and improve efficiency.
The Research Development of the Mechanism of Fatigue Crack Initiation Based on Microstructure for Offshore Platform
Authors: Liu Gui Jie , Wang Yu Qian , Li Meng Meng
Published: August 2014

In the capricious marine environment, the offshore platform structure is exposed to the multiaxial fatigue loading in which damage would be formed in different directions and planes. Evolution of the structural damage physical mechanism caused by marine environment load is more complicated. Based on the analysis of a large number of literatures, this paper reviews the research status of the fatigue crack mechanism in China and abroad, and predicts the development direction in the future.
Finite Element Analysis of a Gantry Type High-Speed Drilling Machine
Authors: Liu Gao Zhi , Qiu Shu Min , Li Sheng Jun
Published: August 2014

The assembly of a gantry type high-speed drilling machine was designed with 3D design software. The analysis of the static and dynamic of the gantry was performed by using a finite element software. The results show that, the existing model has perfectible dynamic and static performance, the safety factor of strength reaches 10.5, static stiffness is 186.6KN/mm, and can meet the requirements. The maximum amplitude of dynamic response of the gantry is reached at the third order modal when the rated spindle speed is 3400 RPM(56.7Hz). In order to avoid the resonance and to ensure the machine with longer service life and high manufacture precision, the spindle speed should be adjusted under 3000RPM. The analysis shows that the design of the existed model is reasonable. However during the further design and optimization, the designers can also reinforce the stiffness of the gantry by reducing the weight of the spindle boxes and increasing the torsional stiffness of the uprights.
The Resistivity Logging Response through Casing of Eight-Layer Formations with Cement Sheath
Authors: Wang An Ling , Liu Fu Ping
Published: August 2014

Because difference of formation model affects the potential distribution on the metal casing, the resistivity logging response can be obtained through casing by measuring the potentials on the metal casing. In fact, the logging responses are the comprehension effects of complex formation with cement sheath and metal casing, so that in the coefficients of transmission line equation (TLE), we should consider the effects of formation with cement sheath model in radial-direction. In the following, for the formation with cement sheath taking on eight-layer in axial-direction, and step in radial-direction, the resistivity logging responses through casing are researched and discussed, and given the recurrence formula with cement sheath to compute potential. Draw the curve of the resistivity logging response through casing of eight-layer formations with cement sheath. The conductivity of formation is computed is very approximating to that of formation with cement sheath model. The computing examples also show that this method has a fast computing speed (the run time of computing example is less than 1s). For analysis the logging response of eight-layers and block formations with cement sheath, and the design of logging instruments, the research is important significance and useful.
Analysis on Fracture Causes of Condensate Water Pump Shaft
Authors: Xu Xue Xia , Li Wei Yong , Feng Yan Ting , Ke Hao , Zhang Guang Xing , Cui Hong Xia , Niu Xiao Guang , Wang Qing
Published: August 2014

Failure causes on a condensate pump shaft were discussed by means of macroscopic observation, chemical composition analysis, metallurgical microstructure inspection, mechanical property tests and stress analysis. The experimental results showed that the improper material with disqualified chemical composition, improper microstructure and poor mechanical properties acted as inherent factor. In addition, structure design that led to stress concentration contributed to the failure as external factor. Finally, fatigue fracture happened at the reduce section of the pump shaft.
Research on Thermal Protection Performance of Multilayer Fabrics System of Fire Clothing
Authors: Yang Liu , Yang Jian Zhong , Li Long
Published: August 2014

This paper studies the fire taking multi-layer fabric thermal protection performance of the system, respectively from the single thermal protective performance of fabric and ten kinds of multilayer composite fabric through analyzing the thermal protective performance, The following conclusions: in terms of single flame retardant fabrics, for the same fabric fiber composition, the TPP value with the thickness of the fabric, square meter weight has significant positive correlation. Experimental results show that multi-layer combination of 8 # protective performance is best, flame retardant protective performance is the most suitable for fire-fighting suits fabrics.
Existing Operational Railway Tunnel Water Leakage Causes and Remediation Technologies
Authors: Peng Lin Jun
Published: August 2014

Water damage is a frequent major diseases existing tunnel, leakage of water in cold regions is an important factor affecting heaving rock tunnel. In this paper, the existing operators Shenyang Railway Bureau tunnel water leakage survey, exploration and measurement of disease, the degradation mechanism of water seepage analysis, watershed remediation works typical tunnel tests selected. Classification regulation for their different causes water leakage, the use of block, row, cited the comprehensive management of technology, leakage of water moving under conditions of rapid closure of the water chemical grouting materials suitable for cold regions selected Malisan various tunnels. After engineering verification, leakage of water from the tunnel to get a fundamental governance, successfully resolved the existing operational railway tunnel seepage water problems for our existing tunnel seepage water governance provide a reliable basis, has broad application value.
Experimental Study on Flexural Behavior of CFRP Bar Reinforced Concrete Bridge Deck with Corrosion and Salt Resistance
Authors: Yang Ze Ying , Zhang Yi Dong , Sun Hua Ming , Sun Qi Hiu , Liu Jia You
Published: August 2014

In order to improve bridges durability, this paper designed a kind of bridge deck with carbon fiber reinforced polymer (CFRP) bar reinforced concrete deck, which is salt and corrosion resistant. Through model test, the relationship between load and displacement, ultimate flexural capacity, stress distribution of CFRP bars, concrete strain distribution of the new bridge deck with different CFRP ratio was investigated. New bridge decks present characteristics of partial plastic failure, has similar structure strain trends and stress distribution compared with steel reinforced concrete decks, and accord with plane section assumption. The bond force, between CFRP bar and concrete, controll the flexural capacity of new bridge decks.
Finite Element Analysis of the Temperature Shrinkage of Fiber Concrete
Authors: Xuan Wei Hong , Wang Pan Xiu , Chen Yu Zhi , Wang Yan , Chen Xiao Hong , Wang Yao
Published: August 2014

In this paper, the temperature stress of singer piece was calculated by FEM and the stress reaction of PP fiber and steel fiber was analyzed. It is knew that the fiber with lower elastic modulus and lagerer spacing can provide weaker constraints and the restriction stress of fiber concrete is smaller. The calculation result of fiber reason space between is consistent with the common value in engineering.
PEG Molecular Weight Effects on Physical and Mechanical Properties of ETICS Plaster, Hardening at Lowered Positive and Small Negative Temperatures
Authors: Pashkevich Stanislav , Pustovgar Andrey , Eremin Aleksey , Adamtsevich Aleksey , Nefedov Sergey
Published: August 2014

The paper
presents
the influence of polyethylene glycol additives wit
h molecular weights of 2000...
6000 on basic physical and mechanical
properties of plaster hardening at low positive and negative temperature
s
.
The dependence of adhesion
s
trength to the polystyrene foam as well as
compressive strength of plaster hardening at tempe
rature
s
(+5...
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on PEG molecular weight
was established.
Aerated Concrete Block Filler Wall Construction Technology and Quality Control of Preventive Measures
Authors: Wang Li Mei , Pi Feng Mei , Yuan Ya Jie
Published: August 2014

Based on aerated concrete block wall material, design, construction three aspects under effective control, so as to avoid the cracking of the wall and carry out.
Comparison of the Effectiveness of Fine Mineral Fillers in Cement-Based Tile Adhesives
Authors: Pustovgar Andrey , Zhuravlev Andrey , Nefedov Sergey , Ivanova Irina , Adamtsevich Aleksey , Esenov Amra , Medvedev Vyacheslav
Published: August 2014

This study investigates the influence of two fine mineral fillers on the main characteristics of tile adhesives – limestone powder and silica flour Silverbond 50. These fillers were added in various dosages: from 2.5% to 10% by weight of mixture.
Development of Load-Bearing Thermal Insulation Recycled Concrete Block and Research on its Thermal Performance
Authors: He Xi Xi , Liang Xing Ming
Published: August 2014

A new kind of 310mm thick load-bearing thermal insulation block utilizing construction waste as coarse aggregate was developed and produced. Internal thermal bridge is reduced by special design of holes pattern and cut off by mal-posed thermal insulation layer arrangement. By testing heat transfer coefficient of four kinds of masonry walls, different aggregate type, masonry unit type and insulation material which affect thermal performance of masonry were studied. Results show that heat transfer coefficient of walls with recycled aggregates is lower than that with natural aggregates under the same condition. By filling thermal insulation material in block holes, heat transfer coefficient is dramatically lowered. Among four types of masonry walls, heat transfer coefficient of 310mm thick load-bearing block wall with recycled aggregate is the lowest, and its thermal insulation performance is the best.
Improvement on Temperature Susceptibility of Matrix Asphalt Modified with Natural Rock Asphalt
Authors: Fu Zhen , Luan Yuan Yuan , Peng Dan Dan , Guo Yi Fei
Published: August 2014

In order to study the influence of natural rock asphalt on the temperature susceptibility of matrix asphalt, the effect of matrix asphalt modified with different dosage natural asphalt was analyzed by penetration index and viscosity temperature index. Research results show that the PI value and softening point of modified asphalt grow with increase of natural asphalt dosage, however viscosity temperature index (VTS) decreases gradually, which indicate that modified asphalt is less influenced by temperature. Namely, the temperature susceptibility is improved, and the improvement effect changes with the increase of natural asphalt dosage.
Research on the Bridge Tower Crack Propagation under Thermal Fatigue Loading
Authors: Shen Jian , Liu Xiao Yun
Published: August 2014

The bridge tower crack extension probability is very large because of the stress concentration at the crack tip, combined with the fatigue stress. Based on the long-term observations of temperature fatigue load spectrums of a bridge tower and the experiment of concrete fatigue performance parameters, the problem of crack propagation is analyzed by infinite life safety reliability model and safe and reliable crack extension randomness model. It is concluded that the concrete structure crack extension probability is close to 98.6% and reasonable repair cycle should be about 3 years.
Review of Landslide Stability Analysis Method
Authors: Wang Nian Qin , Xue Yao Qiong , Yu Zheng , Feng Xin
Published: August 2014

The stability analysis and evaluation is the base of the landslide prevention, at the same time have improvement guidance to the landslide prediction. Divided the Chinese landslide stability analysis of research history into three stages:①experience analysis and evaluation stage;②half experience and semi theoretical analysis and evaluation stage;③theoretical development and the deeping stage. Described the research situation,trend and existing problems of the slide stability analysis and evaluation,get a clear conclusion,put forward my own understanding.
The Correlation of Chloride Diffusion Coefficient and Concrete Maturity Value and its Application in Marine Engineering
Authors: Li Peng Ping , Dong Gui Hong , Xiong Jian Bo
Published: August 2014

The correlation of chloride diffusion coefficient and concrete maturity value within 56 days of curing was investigated by the chemically combined water content method, rapid chloride migration (RCM) test and concrete maturity test, respectively. The experimental results showed the chloride diffusion coefficient of concretes decreased not only with increasing curing ages, but also with increasing curing temperature, which can promote the hydration degree of cementitous. There is a significant correlation between the chloride diffusion coefficient of indoor curing specimens and the concrete maturity value when expressed as a power function (R2=0.976), and the calculated values of concrete maturity for outdoor specimens which obtained by using the power function agrees well with the measured values, then it can use the measured concrete maturity value to predict the chloride diffusion coefficient of concrete. And then in this project, when the immersed tube tunnels were placed in seawater, the recommended value and the control value of concrete maturity was 21064°C•h and 13926°C•h, respectively. Furthermore, the ages of the tunnels placed in seawater can be appropriately adjusted by calculation when considering the external curing temperature and heat of hydration of cementious.
Characterization of Pore Structure of Hardened Cement-Asphalt Paste by Mercury Intrusion Porosimetry
Authors: Zhang Sheng , Zhou Xi Ling , Zheng Ke Ren , Xie You Jun , Fu Qiang
Published: August 2014

To know the pore structure of cement-asphalt pastes, mercury intrusion porosimetry was applied to measure the total porosity, pore distribution and accumulative volume distribution of pore size and the pore structures were analyzed. The results show that the total porosities decline with increase in ages and reduction in A/C ratio. The total porosities declines from 28% at 1d, to 15.8%~17.2% at 28d; the most probable pore size declines from 20nm at 1d to 5nm at 28d.At 28d, there is an increase in the magnitude of pore size between100nm and 5μm; the volume faction of smaller than 5μm is 40~50%; and the amount of pore size smaller than 5nm account for 6%.There are two peaks (5μm & 50μm) in the curves of pore distribution.
Experimental Measurements and Computer Analysis of Heat of Hydration and Shrinkage of Large-Scale Model of Reinforced Concrete Slab
Authors: Tej Petr , Čech Jindřich , Kolisko Jiří , Citek David , Vítek Jan L.
Published: August 2014

This paper deals with the experimental measurements and computer analysis of the development of heat of hydratation and shrinkage in a large-scale model of a reinforced concrete slab. A large-scale model was built in situ to experimentally verify the design of the reinforcement, with the aim of preventing the formation of cracks in slab. The model represents a four times four meters cut of a slab structure of a thickness of 1.6 m. Bars in the horizontal direction of the slab were extended behind the concrete body and welded to a steel frame, which simulated the anchorage of horizontal reinforcement of a continuous slab. Before casting, the reinforcement bars were fitted with vibrating wire strain gauges and with resistance gauges for monitoring the strain, as well as with temperature sensors for determining the temperature field caused by heat of hydration. According to the needs of the experiment, the structure was modelled in GiD 11.0 software and calculated in the AtenaWin program. The experimental results and the results obtained by a numerical analysis were compared.
Experimental Measurements and Computer Analysis of Heat of Hydration and Shrinkage of Large-Scale Model of Reinforced Concrete Wall with Base
Authors: Tej Petr , Čech Jindřich , Kolisko Jiří , Citek David , Vítek Jan L.
Published: August 2014

This paper deals with the experimental measurements and computer analysis of the development of heat of hydration and shrinkage in a large-scale model of a reinforced concrete wall with a base slab. A large-scale model was built in situ to experimentally verify the design of the reinforcement, with the aim of preventing the formation of cracks in a long massive wall located on a base slab. The model represents a four meter cut of a long wall structure (thickness of 1.6 m) together with its base slab (thickness of 1 m). Bars in the longitudinal direction of the wall and of the base slab were extended behind the concrete body and welded to a steel frame, which simulated an anchorage of longitudinal reinforcement of a continuous wall with a base slab. Before casting, the reinforcement bars were equipped with vibrating wire strain gauges and resistance gauges for monitoring the strain, as well as with temperature sensors for determining the temperature field caused by heat of hydration. According to the needs of the experiment, the structure was modelled in GiD 11.0 software and calculated in the AtenaWin program. The results of the experiment and the numerical analysis were mutually compared.
LQG Control of Across-Wind Response of a Tall Building with AMD
Authors: Kim Young Moon , You Ki Pyo , You Jang Youl
Published: August 2014

Modern tall buildings are more flexible so occur excessive wind-induced vibration resulting in occupant discomfort and structural safety. Many studies to reduce such a wind-induced vibration using a feedback controller and auxiliary devices have been conducted .The optimal control law of linear quadratic Gaussian (LQG) controller is used for reducing the across-wind vibration response of a tall building with an active mass damper (AMD). Fluctuating across-wind load treated as a Gaussian white noise process is simulated numerically in time domain. And using this simulated across-wind load estimated across-wind vibration responses of tall building with AMD using LQG controller.
The Effect of Cooling Rate and Overaging Time on the Mechanical Properties of a Ultra-Low Carbon Auto Steel
Authors: Fang Fang , Pan Li Bo
Published: August 2014

A series of annealing parameters including the cooling rate and overaging time, especially ultra high cooling rate of a ultra-low carbon auto steel were conducted on HDPS (hot dipping process simulator) in experiment. The research results show that, when samples were conducted under extra fast cooling rate higher than 30 °C/s, yield and tensile strength almost changed not when cooling rate increased from 30 to 50 °C/s, as cooling rate reached 90 °C/s, the strength and elongation changed more rapidly. When the overaging time changed from 130 to 300 s, the elongation was more sensitive, changed from 19.7 to 25.6 %. Yield and tensile strength were not sensitive when aging time was below 213 s, but with increasing aging as high as 300 s, the yield strength decreased 11 MPa, and tensile strength decreased 21 MPa.