bluuebunny/crossref_metadata_2025 huggingface dataset:
A Monotonic Degradation Assessment Index of Rolling Bearings Using Fuzzy Support Vector Data Description and Running Time
Authors: Shen Zhongjie , He Zhengjia , Chen Xuefeng , Sun Chuang , Liu Zhiwen
Published: July 2012

Performance degradation assessment based on condition monitoring plays an important role in ensuring reliable operation of equipment, reducing production downtime and saving maintenance costs, yet performance degradation has strong fuzziness, and the dynamic information is random and fuzzy, making it a challenge how to assess the fuzzy bearing performance degradation. This study proposes a monotonic degradation assessment index of rolling bearings using fuzzy support vector data description (FSVDD) and running time. FSVDD constructs the fuzzy-monitoring coefficient which is sensitive to the initial defect and stably increases as faults develop. Moreover, the parameter describes the accelerating relationships between the damage development and running time. However, the index with an oscillating trend disagrees with the irreversible damage development. The running time is introduced to form a monotonic index, namely damage severity index (DSI). DSI inherits all advantages of and overcomes its disadvantage. A run-to-failure test is carried out to validate the performance of the proposed method. The results show that DSI reflects the growth of the damages with running time perfectly.
Synthesis of Bioactive Microcapsules Using a Microfluidic Device
Authors: Kim Byeong Il , Jeong Soon Woo , Lee Kyoung G. , Park Tae Jung , Park Jung Youn , Song Jae Jun , Lee Seok Jae , Lee Chang-Soo
Published: July 2012

Bioactive microcapsules containing Bacillus thuringiensis (BT) spores were generated by a combination of a hydro gel, microfluidic device and chemical polymerization method. As a proof-of-principle, we used BT spores displaying enhanced green fluorescent protein (EGFP) on the spore surface to spatially direct the EGFP-presenting spores within microcapsules. BT spore-encapsulated microdroplets of uniform size and shape are prepared through a flow-focusing method in a microfluidic device and converted into microcapsules through hydrogel polymerization. The size of microdroplets can be controlled by changing both the dispersion and continuous flow rate. Poly(N-isoproplyacrylamide) (PNIPAM), known as a hydrogel material, was employed as a biocompatible material for the encapsulation of BT spores and long-term storage and outstanding stability. Due to these unique properties of PNIPAM, the nutrients from Luria-Bertani complex medium diffused into the microcapsules and the microencapsulated spores germinated into vegetative cells under adequate environmental conditions. These results suggest that there is no limitation of transferring low-molecular-weight-substrates through the PNIPAM structures, and the viability of microencapsulated spores was confirmed by the culture of vegetative cells after the germinations. This microfluidic-based microencapsulation methodology provides a unique way of synthesizing bioactive microcapsules in a one-step process. This microfluidic-based strategy would be potentially suitable to produce microcapsules of various microbial spores for on-site biosensor analysis.
Trends in HIV-1 Reverse Transcriptase Resistance-Associated Mutations and Antiretroviral Prescription Data from 2003–2010
Authors: Miller Michael D , Haddad Mojgan , Su Cathy , Gibbs Craig , McColl Damian J , Guyer Bill
Published: July 2012

Background

The selection of antiretroviral (ARV) drugs for treatment of HIV-1 infection is based on several factors including potency, toxicity, resistance and ease of administration. Emtricitabine (FTC) or lamivudine (3TC), components of recommended initial ARV regimens, are structurally related and share the same resistance mutation (M184V/I). However they differ with respect to potency and incidence of M184V/I.

Methods

Resistance-associated mutation (RAM) prevalence data were obtained from genotype test results performed in a large reference laboratory from 2003–2010; subsets of data were defined by mutation pattern to resemble those following failure of non-nucleoside reverse transcriptase inhibitor (NNRTI)-based combination therapy. Mutational trend data were compared to contemporaneous ARV prescription information.

Results

In the unfiltered data set ( n=107,231), the prevalence in 2010 decreased compared to 2003 for all nucleoside/nucleotide reverse transcriptase inhibitor (NRTI) RAMs, such as M184V/I (44.0% to 17.9%), T215Y (22.7% to 4.1%), and K65R (4.3% to 2.1%). Among samples resembling those typical of first-line NNRTI-based failures, prevalence of K103N increased slightly, but prevalence of M184V/I decreased (49.8% to 36.8%), as did other NRTI RAMs. These decreases were coincident with a shift in ARV prescriptions away from zidovudine and 3TC towards tenofovir and FTC, and an increase in use of fixed-dose combinations.

Conclusions

RAM prevalence decreased substantially since 2003 among samples submitted for resistance testing in the US. The causes of this decrease are multifactorial, but our results suggest a possible role of increased use of potent ARVs that are available as fixed-dose combinations or as single-tablet regimens.
Prélèvement/déplacement : le document au lieu de l'œuvre
Authors: Zenetti Marie-Jeanne
Published: July 2012

Résumé Le montage documentaire, qui apparaît comme une forme caractéristique des modalités d’intégration du document dans la littérature du vingtième siècle, connaît des cas limites, où le document envahit entièrement l’espace textuel et se voit ainsi livré en lieu et place de l’œuvre. Alexander Kluge dans Stalingrad, description d’une bataille et Charles Reznikoff dans Testimony se cantonnent volontairement à un geste de sélection, de compilation et de mise en forme de discours préexistants, sans jamais interpréter ou analyser les documents qu’ils citent. Pourtant cette intégration à un contexte littéraire suffit à modifier le regard que le lecteur porte sur le document : le prélèvement est aussi un déplacement qui l’ouvre à d’autres usages et à d’autres interrogations.
Vous et moi : usages autobiographiques du matériau documentaire
Authors: Montémont Véronique
Published: July 2012

Résumé Les textes autobiographiques contemporains sont fréquemment placés sous le régime de l’hybridation : les dernières décennies montrent un important et fréquent retour au document, que le texte mentionne, cite, et de plus en plus souvent montre. Une analyse statistique et thématique permet d’observer les points de contact et les modalités de coexistence (fusion, tension, friction) de ces matériaux hétérogènes que sont les lettres, les photographies, les journaux et les archives publiques sur lesquels les auteurs choisissent de s’appuyer. La présence de ce matériau documentaire au sein du texte, en tout état de cause, interroge la forme même de l’autobiographie, qu’elle arrache au solipsisme énonciatif : dans certains cas, l’intention est polémique – une sorte d’offensive antinarcissique ; dans d’autres, elle participe du désir d’une autobiographie assimilatrice, qui cherche à inscrire la destinée individuelle dans l’histoire familiale, sociale, politique.
Les femmes de Juárez : meurtre, disparition, silence et traduction dans les œuvres de Roberto Bolaño et Sergio GonzalezRodriguez
Authors: Robert-Foley Lily
Published: July 2012

Résumé Où situer la ligne de partage entre fiction et document ? 2666 de Roberto Bolaño et Huesos en el Desierto de Sergio Gonzaléz Rodriguez portent sur le même sujet : le meurtre, réel, de trois cent femmes aux alentours de la ville mexicaine de Juárez. Chacune de ces œuvres traite ces événements en repoussant les limites du genre auquel elle est supposée appartenir. En effet, si le livre de Roberto Bolaño relève du domaine de la fiction, celui de Sergio Gonzaléz Rodriguez est généralement considéré comme une œuvre de prose documentaire. La mise en regard de ces textes, qui brouillent la limite entre fiction et non-fiction, témoigne de la porosité des frontières génériques dans les écritures contemporaines, et invite à s’interroger sur leur pertinence.
Du document à l'archive : l'historien de la littérature face à ses sources
Authors: Bloomfield Camille
Published: July 2012

Résumé Comment les études littéraires peuvent-elles utiliser les archives d’écrivains ? Si celles-ci peuvent constituer une source d’information sur la fabrique des œuvres, dans une perspective génétique, elles doivent aussi être considérées comme des documents que l’on peut interroger pour mieux cerner à la fois le rapport de ces écrivains à leur mémoire, et, en filigrane, le fonctionnement de l’institution littéraire elle-même. À partir d’un travail sur les archives de l’Oulipo, il apparaît que les travaux issus de l’historiographie peuvent être réinvestis, dans le but de repérer comment certains écrivains transforment, plus ou moins volontairement, leurs documents en autant de monuments pour la postérité.
Les jeux en ligne : un laboratoire de modèles d'affaires
Authors: De Prato Giuditta
Published: July 2012

Résumé L’objectif de cet article est de présenter l’écosystème des jeux en ligne, son fonctionnement et de suivre l’apparition de nouveaux modèles d’affaires et des formes d’intermédiation qui ont vu le jour au sein de cet univers des jeux en ligne. Il décrit l’évolution de l’organisation de la production, de la répartition des recettes et des modèles d’affaires. Il s’interroge en conclusion sur la façon dont ce sous-secteur anticipe des changements à venir dans le secteur des médias et loisirs auquel il se rattache.
Bricoler, domestiquer et contourner la science : l'essor de la biologie de garage
Authors: Meyer Morgan
Published: July 2012

Résumé De plus en plus d’amateurs construisent aujourd’hui des laboratoires rudimentaires dans leurs garages, cuisines, ou caves pour y réaliser des expérimentations en biologie moléculaire. Cet article analyse les lieux et la matérialité de cette « biologie de garage » (ou « do-it-yourself biology » ). Des techniques et des objets spécifiques sont nécessaires pour transformer une maison privée en un lieu où des expérimentations peuvent être réalisées. L’article montre que l’abordabilité, la disponibilité et surtout la mutabilité d’objets sont des facteurs essentiels. On observe ainsi des objets qui sont transformés, donnés, combinés, remplacés, imités, achetés en occasion, etc. En particulier, l’utilisation de « contournements créatifs » autour d’objets (pour les transformer et les combiner de manière nouvelle) et autour d’institutions (afin de contourner des liens économiques établis entre les universités et l’industrie) est à relever. Les biologistes de garage utilisent divers dispositifs de communication - sites Web, blogs, outils open source, forums, vidéos – pour échanger des connaissances et des objets et pour ainsi surmonter certaines frontières.
Michel Adanson au Sénégal (1749-1754) : Un grand voyage naturaliste et anthropologique du Siècle des lumières
Authors: Carteret Xavier
Published: July 2012

Résumé L’auteur, après quelques rappels biographiques et historiques nécessaires, revient sur l’expédition que le naturaliste Michel Adanson (1727-1806) entreprit au Sénégal de 1749 à 1754. Un bilan général de ce voyage, en termes de découvertes dans les sciences de la nature, est donné. Un bref regard est enfin porté sur les problèmes de la colonisation du Sénégal et la question de l’esclavage au milieu du xviii e siècle, à travers le témoignage du jeune Adanson.
Climatologie et médecine au Canada au XIIIe siècle
Authors: Tésio Stéphanie
Published: July 2012

Résumé Successeur de Michel Sarrazin, Jean-François Gaultier, médecin normand, arrive à Québec en 1742, avec la charge de médecin du roi. Sa correspondance avec l’Académie royale des sciences de Paris fournit principalement une description minutieuse de ses observations climatologiques et botaniques, mais également agricoles et médicales. En effet, Gaultier appartient au mouvement européen de la médecine météorologique ou aériste, créé par Hippocrate et développé par Thomas Sydenham en Angleterre dans la seconde moitié du xvii e siècle, et dont l’objectif est d’établir une relation étroite entre la météorologie et la maladie. D’après l’historiographie actuelle, Gaultier est le premier médecin à en témoigner officiellement dans les colonies françaises.
Le projet du néolamarckisme français (1880-1910)
Authors: Loison Laurent
Published: July 2012

Résumé Il est acquis que les thèses darwiniennes et surtout néo-darwiniennes connurent une implantation difficile dans la communauté scientifique française. L’opposition qu’elles rencontrèrent participa à structurer un transformisme différent, généralement qualifié de néolamarckien. Ce transformisme français fut souvent décrit – et parfois par les scientifiques eux-mêmes – comme une entité hétérogène, simple juxtaposition de conceptions critiques sans unité générale. Nous défendons ici une interprétation inverse de cette histoire. L’objet de ce texte est de présenter la positivité propre du néolamarckisme français. Ceci sous-entend que, d’une part, ce transformisme disposait d’une certaine cohérence interne, et que, d’autre part, celle-ci n’est pas réductible à une forme générale dont le cas français ne serait qu’une délimitation simplement géographique. Le néolamarckisme français fut cohéré par un projet, celui de rendre scientifique l’hypothèse transformiste. Il fallait à cette ambition une assise théorique, soit l’inscription de cet évolutionnisme dans l’explication causaliste mécanique de l’univers matériel. Il lui fallait également une projection empirique, soit le développement de ce que l’on appela alors le transformisme expérimental. Derrière ce projet, on lit le désir de construire un transformisme analogue au modèle de scientificité qu’était à la fin du xix e siècle la physiologie bernardienne.
A New Combination Method of Temperature and Vehicle Load Effects Based on SHM Data
Authors: Wang Zi Jian , Hu Rong Pan , Li Shun Long
Published: July 2012

When more than one load act on a structure, the combination of the load effects should be considered, especially for which are variant in time and in space. A new method to calculate the combination of two different loads effects as well as to predict the extreme value distributions in the subsequent service life is proposed. The loads discussed in this paper are two main loads acting on the cable-stayed bridge: the temperature and vehicle load, which can be modeled as rectangular pulse process and filtered Poisson process respectively. Firstly, truncated distributions of the two load effects are depicted using the monitoring data of Nanjing 3rd Yangtze River Bridge. The generalized Pareto distribution fits well to the upper tails of the vehicle load effect and the mean values of the temperature load effect in an hour follows a two weighted normal distribution. Then the combination of the two load effects as well as the prediction of extreme values in the subsequent service life can be calculated. In the end, the results obtained through the proposed method are compared with the observed value of the bridge.
A Cell-Based Regional Evacuation Model with Contra-Flow Lane Deployment
Authors: Zhang Xin Ming , An Shi , Xie Bing Lei
Published: July 2012

Based on SO-DTA and one-destination evacuation, a cell-based regional evacuation model, which embeds CTM and point-queue model, is proposed in this paper. The road network is converted to the cell-node topology structure so as to reduce the constraints. The “traffic holding” problem also be solved in the model by an OSP constraint. And to improve the evacuation efficiency, contra-flow lane is imported. A numerical experiment is conducted to verify the proposed model and algorithm.
Evaluation of Warm-Mix Asphalt Compaction Performance by Variable-Temperature Gyratory Compaction
Authors: Wang Li Ming , Tan Yi Qiu
Published: July 2012

As the residue level of viscosity reducing in after mixing WMA would dynamic change with paving time and temperature, which should influenced on their compaction performance accordingly. The paper employed a improved variable-temperature control SGC compaction experiment to evaluate the compaction performance of four kinds of typical Warm-Mix Asphalt. In the paper, the compactibility at different temperature and the optimum compaction temperature were two way to represent different aspects of compaction performance. By experiment, the authors believed that the construction energy index is more suitable to express the compactibility than the slope of logarithmic fitting curve. And the authors proposed a equidensity –temperature method which based on analogous principle to determine the optimum compaction temperature. According to the experiment results, there are significant difference in the compactibility development trends and the optimum compaction temperature of different Warm-Mix Asphalt. The overall evaluation information of Warm-Mix Asphalt compaction performance could be get by the combination used of the compactibility development trends and the optimum compaction temperature which based on the improved variable-temperature gyratory compaction.
Investigation of the Responses of Asphalt Pavement Structure Considering Load - Poisson's Ratio Relation
Authors: Zhang Lei , Tan Yi Qiu , Ou Yang Jian , Gong Xiang Bing
Published: July 2012

Abstract. Poisson’s ratio is one of the important parameters that can be used to reflect the deformation characteristics of solid materials. To further understand the mechanical behaviors of materials and improve the accuracy of the finite element simulation results, the Poisson’s ratio must be defined accurately. In this paper, DIC technology is employed to investigate the Poisson’s ratios of asphalt mixtures under the different gradation and different compaction conditions. It is found that the Poisson’s ratios of different asphalt mixture are quite different and the number of compaction had a greater influence on Poisson’s ratio. It also showed that Poisson’s ratio of asphalt mixture was not a constant under the 25°C temperature condition, but varied with load. The experiment data suggested that the curve of the load - Poisson’s ratio could be divided into three sections through the observation of the graph and it also could be used to investigate the properties of asphalt mixtures deformation resistance. General-purpose finite element software is used to simulate the different contact pressure and Poisson’s ratio under dynamic loading condition, in order to find the response of asphalt pavement structure based on the relationship between load and Poisson’s ratio. It was found that the relationship of load - Poisson’s ratio significantly affected the response of asphalt pavement. It meant that the relationship of load - Poisson’s ratio should be considered when designing the asphalt pavement to improve the asphalt pavement service life.
Site Monitoring on Temperature Field Distribution of Asphalt Pavement in Seasonal Frozen Soil Region
Authors: Ma Hong Yan , Feng De Cheng , Jing Ru Xin
Published: July 2012

As pavement bear the comprehensive effect of environment factors at the same time, its internal temperature field distribute complicatedly and difficult to be predicted. Due to the internal temperature field of pavement is the key of pavement performance and service durability, this paper improved the layout scheme of the temperature field, based on the previous test scheme of factual temperature field. Using the factual temperature field data of asphalt pavement, this paper studied on the temperature distribution characteristic of each layer, summed the temperature filed distribution rule of asphalt pavement and put forward the control points of pavement design low temperature.This paper verified the universality of low design temperature in SHRP (Strategic Highway Research Program) and pointed out some problems like the low temperature design temperature (Tmin) had quite large safe factor.
The Influence of Admixtures on Vibration Viscosity Coefficient of Pavement Concrete
Authors: Yu Ji Shou , Cai Xiao Ping , Ge Yong , Wu Zhi Gang
Published: July 2012

In this paper, the influences of common admixtures including air entraining agent, superplasticizer, shrinkage-reducing agent, retarder, fly ash and slag on vibration viscosity coefficient of fresh concrete were analyzed. The results showed that the vibration viscosity coefficient of fresh concrete was markedly decreased when using UNF-5 naphthalene formaldehyde sulphonated superplasticizer. When SJ-2 air entraining agent, SZ103 shrinkage-reducing agent, retarder and slag were used, the vibration viscosity coefficient of fresh concrete was also reduced. But when fly ash was added, the vibration viscosity coefficient of fresh concrete was increased.
The Flexural Strength and Frost Resistance of Air Entrained Concrete
Authors: Zheng Xiu Hua , Li Qin Fei , Yuan Jie , Ge Yong
Published: July 2012

The flexural strength and frost resistance properties of air entrained concrete were tested in this study. Although the flexural strength of concrete does not change largely with increasing of air content, it still has a maximum value with air content of 4%. The test results show that the frost resistance increase with increasing of air content. In air entrained concrete, the total air content is not the only factor that affect the final properties of the concrete, the air void structure parameters, including void size, shape, and distribution, are key factors as well. It was found that the air void structure and the frost resistance properties were influenced by the vibration time largely. The optimized vibration time is 30s.
Plastic Anisotropy Research of As-Rolled 7050 Aluminum Alloy Plate with T7451 Temper
Authors: Chen De Bin , Hu Hui E , Kong Xiao Dong
Published: July 2012

Plastic anisotropy of the as-rolled 7050 aluminum alloy plate with T7451 temper was investigated by tensile tests, OM, SEM and TEM. The results show that the as-rolled 7050 aluminum alloy plate shows plastic anisotropy. The values of the as-rolled 7050 aluminum alloy plate deformed along ST, LT and RD are 7.178%, 10.69% and 12.877%, respectively. The as-rolled 7050 aluminum plate can be considered as a materials with two phases. Microstructure, especially grain shape and precipitate configuration, is the main source of plastic anisotropy of the as-rolled 7050 aluminum alloy plate with T7451 temper.
Effects of Aging Treatment on the Damping Capacities of ZA84-xSb Magnesium Alloys
Authors: Wang Jian Qiang , Guan Shao Kang , Zhu Hao
Published: July 2012

The effects of aging treatment on the damping capacities of ZA84-xSb alloys were studied. The results show that in the aging treatment process, because of following mainly reasons: (1) the dissolution of the ternary phases, (2) the increase of grain interfaces, (3) the increases of dislocation density, and (4) the micro deformations of matrix interfaces and the second phases, the damping capacity of ZA84-xSb magnesium alloys did not be reduced. On the contrary, whether at the low temperatures or high temperatures, its damping capacity is higher than as-cast alloy, which is of great significance for the application of ZA84-xSb magnesium alloys.
Continuous Preparation of Low-Molecular-Weight Chitosan by the Combination of Ozone Treatment and Membrane Separation
Authors: Wei Chao , Liang Jin Tian , Yue Wu , Yao Ping Jia
Published: July 2012

The continuous production of water-soluble low-molecular-weight chitosan (WSLMWC) was successfully achieved with an innovative continuous production system which consisted of ozone generating subsystem, degradation subsystem, and fractionation subsystem. The continuous production of the WSLMWC was performed through three uninterrupted steps: the first, the continuous preparation of the ozone from compressed oxygen, the second, the continuous degradation of chitosan by ozone treatment, and the last, the continuous fractionation of the WSLMWC from the degraded chitosan solution (DCS) by ultrafiltration (UF) membrane. The DCS as the most suitable feed supplied to UF membrane was ascertained. Three different WSLMWC products as useful materials in biomedicine and food were obtained, namely LMWC-3KDa, LMWC-5KDa, and LMWC-10KDa.
The Effect of Nano-Graphite Particle to the Friction and Wear Performance of Al-Mg Matrix Composite Material
Authors: Tang Shi Ying , Liu Xiao Xin , Lin Ying Rui , Wen Chao
Published: July 2012

In this paper, with the combination of powder metallurgy and hot pressing method, the nano-graphite Al-Mg composite material was made. This method succeeds in solving the difficulty that graphite particle directly melted with Al-Mg melt, which investigates the amount of nano-graphite’s impact on the abrasion resistance of Al-Mg composite material. The result shows that nano-graphite particle easily to scattered in the matrix when the nano-graphite particle amounts to 1﹪ which can decrease the friction coefficient of composite material. But the material of wear extent increases accordingly along with the increase of the content of nano-graphite.
Tribological Behavior of Graphite Encapsulated Nickel Nanoparticles Formed by Ball-Milling and Annealing Method
Authors: Liu Zhi Guo
Published: July 2012

Graphite encapsulated nickel nanoparticles were prepared by ball-milling and subsequent annealing a mixture of expanded graphite and nickel powders. The products were characterized by transmission electron microscope (TEM), and their tribological behavior used as lubricating additive was investigated by using a high-temperature tribo-tester. The morphology of the worn tribo-surfaces was observed by scanning electron microscope (SEM). The results show that as-prepared graphite encapsulated nickel nanoparticles with a size range of 10-150 nm have a marked anti-friction and wear resistance effect, and the larger the applied load, the lower the friction coefficient and the wear severity.
Dynamic Fracture of the 20# Cylindrical Steel Shell under Inside-Explosion Loading
Authors: Wang Deng Wang , Qin Xue Jun , Tang Shi Ying , Liu Wen Xiang
Published: July 2012

Dynamic fracture of explosion containment vessels subjected to internal blast loads is the foundation for conducting safety assessment and failure analysis of explosion containment vessels. The experiments were carried out to investigate dynamic fracture characteristics of cylindrical steel shells subjected to internal blast loadings at the centers. The elastic-plastic response of cylindrical steel shells was conducted using nonlinear dynamic finite element analysis code LS-DYNA. The fracture mode and fracture mechanism of a cylindrical shell were specially studied through analysis of deformation， macrographs of fracture surface and elastic-plastic response. The results show that dynamical ductility deformations appear and the shear bands form when the cylindrical steel shell expands under internal blast loading. The cylindrical steel shell fractures preferentially along the shear bands due to its softening effect. The fracture mechanism is that the shear bands tear under tensile circumferential stress. The shear bands and the tensile circumferential stress dominate the final fracture mode. The fracture mode is of the ductile fracture.
Effect of Process Parameters on Dimensional Accuracy of the Part in Hot Press Forming Process
Authors: Long An , Ge Rui , Wang Hui , Chen Yin
Published: July 2012

To research the problem of part’s dimensional accuracy error easily occurred in hot press forming, a B-Pillar on one domestic car was set as example, the dimensional of the actual part and its model diagram were compared by means of ATOS optical scanner. By recording the the process parameters used in practical production, the effect trend of three key process parameters on part’s dimensional accuracy was summarized, process parameters suitable for practical production were gained.
E-Shape Steel Damper Destruction Mechanism Research
Authors: Zheng Yu Qing , Zheng Hui Meng , Tong Xiao Wu
Published: July 2012

This paper mainly introduced one kind of new E-shape Steel Damper structure performance. The finite element method was applied in the E-shape Steel Damper structure performance evaluation. The damper model was set up and stress analysis was executed to predict the stress distribution under the working load in Abaqus. Besides, the real test in lab was accomplished to determine the site where the destruction took place and the reason why it happened. The test result verified that the simulation was correct and reliable. Study on the E-shape Steel Damper performance based on above both methods revealed that excessive plastic deformation was the main factor to cause the damper destruction to occur.
Research and Implementation of Vibration Based on Analysis of Vehicle Ride Comfort
Authors: Xiong Jian Qiang , Huang Ju Hua , Qun Liao
Published: July 2012

Analysis of vehicle ride comfort mainly refers to the vibration and shock environment impact on occupant comfort within certain limits, which will not make people feel comfortable, fatigue and even damage to health performance. Therefore, ride comfort is evaluated mainly based on subjective feelings of the crew, but also for the truck to maintain the performance of the goods in good condition; it is the main performance of modern high-speed car vehicle. The paper proposed a simulation modeling of the vehicle in ADAMS based on the multi-body dynamics theory; we made analysis of vehicle ride comfort on a random road. The result presents the process of building vehicle model and analysis of ride comfort and provides a basis for optimization of vehicle parameters. With this optimized design, the vibration of the vehicle has very significant performance improvements.
Experimental Investigation of Water Flow Heat Transfer in Metal Foams
Authors: Sun Tao , Bu Shi , Xu Yue Han , Wang Zhong Yi
Published: July 2012

This paper aims at finding the best pore density and porosity of metal foams for heat transfer, as well as the most proper operating conditions. A circulating water cooling system were designed which include micro-channel heat sink, heat exchanger, micro-pump, rot meter, electric heating rods, and conversion fans for the experiment. The comparison was made between different metal foam samples in terms of flow rate and equilibrium temperature of heating boundary. The results presented that a relatively low temperature can be achieved when flow rate is large, but at the same time the pressure drop increased. The excellent heat dissipation performance of metal foams has a close relationship with its specific surface area.
Sensitivity Analysis of Vibration Suppression Based on the Multiple-Mode Negative Impulses Input Shapers
Authors: Wang Yue Zhan , Yan Qi Bo , Li Bing , Wei Yu Lan
Published: July 2012

The structure of a 3-DOF parallel manipulator is presented. The methodologies of multiple-mode negative impulses input shaping is introduced, which can decrease the delay time of the system response while the residual vibration is suppressed. The parameters of two-mode negative impulses and positive impulses input shapers of the 3-DOF manipulator are presented. The sensitivity analysis of these input shapers are carried out through numerical simulations, and the robust of the input shapers are presented and compared.
Schematic Design and Research on Steering Mechanism of Drilling Robot
Authors: Jian Xiao Gang , Wang Ye Feng , Yang Peng Chun
Published: July 2012

Through the research on drilling robot at home and abroad, this paper divides steering methods into two types: steering caused by radial motion of body parts; steering caused by deflection of the head. Based on this classification, several schematic designs of steering mechanism are proposed. Respectively, structural design and principle analysis of steering mechanisms are carried out. And steering mechanism 3 is chosen the best one through comparison from the following aspects: No. of motors in the steering mechanism, size, turning radius and control difficulty. In order to prove its feasibility theoretically, the detailed modeling and analysis are presented. The results of DOF (degree of freedom) calculation and kinematics simulation of the head point show that its motion is determined and no collision exists between the parts during the kinematical process. The relation among peak value of rollers’ trajectory H, distances from rollers to the rotation axis of the cylindrical cam r and maximum deflection angle θmax is analyzed by building the deflection model, which lays foundation for further optimization.
Study on the Design of Ultrasonic Vibration Petrol Atomizer Vibrator
Authors: Yin Zhen , Li Hua , Cao Zi Yang , Zhao Jiang Jiang , Chen Yu Rong
Published: July 2012

Abstract. A design method of ultrasonic vibration petrol atomizer vibrator was proposed based on one-dimensional elastic vibration theory. The model and harmonic analyses of the vibrator were performed by using the FEA software ANSYS. Experimental Study of the petrol atomizer was carried out and the atomization performance of the prototype was verified.
Back Stepping Control of the Magnetic Suspension System
Authors: Wang Zhao Yuan , Wu Guo Qing
Published: July 2012

The magnetic suspension system is a strong nonlinear, uncertain and open-loop unstable system. All of these factors have increased the difficulty of maglev controller design. Considering the single freedom maglev system as the research object in this paper, structure analysis and modeling design are conducted for the system. By choosing new state variables, the system model is transformed. On the basis of that, we use back stepping design method to design the nonlinear suspension controller. Control performance of the controller can be observed by the Matlab/Simulink simulation.
The Research on the Zero-Tooth-Difference Internal Gear Measuring Method
Authors: Wei Yu Lan , Li Bing , Fan Ying Ying , Jin Meng Dan
Published: July 2012

A variable gear measuring method was put forward in order to define the error of eccentricity of the zero-tooth-difference internal gear, which was based on the three-coordinate measuring machine. This method can scan the coordinate of tooth profile automatically and fleetly, then by calculating the difference of the tooth profile curve between the theory and reality, and achieving the measure on line about geared ring radial runout to define the error of eccentricity. The results of this experiment and theoretic analysis showed that the method which was putted forward has many advantages, like the density of sampling is big, the calculation is simple, the measure is accurate, and the human factors are very little.
Design of a Logging Tool Valve Based on Finite Element Analysis
Authors: Dai Min Qiang , Zhao Sheng Dun , Cai Wei
Published: July 2012

The paper introduces the working principle of a logging instrument, and according to the working principle and instrument’s function of two-way hydraulic control valve. Facing to the key problems of process equipment in the actual service and workflow, the structure of value was designed and optimized. According to the basic functions and physical model of dual-channel and two-way hydraulic control valves, we used hydraulic system simulation software to establish the mathematical model of the entire system. Besides, we maked the simulation of the running state based on the Running results. At the same time, on the grounds of theoretical calculations and simulation results, the influences of the body affected by the external factors in work environment were assessed, and the logging instrument with a dual-channel and two-way hydraulic control valve is designed and processed. Meanwhile, we build an experimental platform and make the experiment according to principle of the instrument. The results show that the design of this dual-channel and two-way hydraulic control valve logging instrument met the work requirements, and it has high reliability in oil exploration, which could be promoted and used in logging areas.
Recovery of Lubricating Oil for Cold Strip Rolling
Authors: Wang Yue Zhan , Yan Qi Bo , Huang Jin Jing , Li Bing , Gao Jin Lin
Published: July 2012

A lot of lubricating oil is consumed in the process of the cold rolling of stainless steel. The oil recovery is very important due to some reasons, such as the cost of production and environmental pollution. A set of lubricating oil recovery system is designed and constructed, which is equipped with a set of expanded size recovery oil pan for recycling splashed oil, a high efficiency two-level mist recovery system for recycling the oil mist, and an oil collection platform for recycling the oil rolled. The system is effectively to recovery more of lubricating oil through actual use and measurement.
Temperature Sensibility of Epoxy-Matrix Carbon Fiber Smart Layer
Authors: Zheng Hua Sheng , Li Jing , Zhu Si Rong , Li Zhuo Qiu
Published: July 2012

The paper deals with the temperature sensitivity of a new type strain sensor named carbon fiber smart layer (CFSL) made of epoxy-matrix composites with short carbon fiber mats. The experiment result indicated that the epoxy matrix CFSL is sensitive to temperature variation. It exhibits NTC effect in -5°C~25°C and exhibits PTC effect in 25°C~50°C. The NTC effect is relatively gentle and the PTC effect is relatively dramatic. The mechanism of both NTC effect and PTC effect is discussed based on the temperature sensitivities of carbon fiber itself and the fiber to fiber interface. Further experiment demonstrated its temperature sensing properties in the temperature scale in which the NTC effect or PTC effect exhibits individually.
Application of Computer in Material Science and Engineering
Authors: Seng De Wen
Published: July 2012

The application of computer in material science and engineering is developing increasingly. To use the technology correlatively, for example, data processing, simulation techniques, mathematical model and database etc. Through the process of establishing the mechanism model, using a computer data analysis process in materials science, the model predicts the optimal design to achieve. Computer application technology continues to evolve, gradually and comprehensively solve the major technical problems in materials science and engineering. The paper analyzed the substances of computer application in the materials science and engineering, optimization, curve and fitting expression and crystal growth.
The Research and Analysis of R-Tree Spatial Index Based on K-Means Clustering
Authors: Diao Ren Hong
Published: July 2012

This paper researched combining K-Means algorithm with method of spatial index in spatial database, and analyzed mainly research results of spatial index technology based on K-Means algorithm and their technical scheme. Finally, research trend of combining clustering and spatial index was proposed.
Largely Enhanced Figure of Merit for CoSb3 Thermoelectric Material by Introducing Disordered Structure
Authors: Lu Peng Xian , Lu Man Man
Published: July 2012

To enhance the Seebeck coefficient and reduce the thermal conductivity and meanwhile keep an excellent electrical conductivity, the disordered structure was introduced into the ordered CoSb3 nanocrystalline by increasing hot-pressing temperature. The results show that the introduced disordered structure can increase the Seebeck coefficient from 125 VK-1 to 390 VK-1 measured at 773K, the thermal conductivity can be reduced from 1.94 Wm-1K-1 to 1.73 Wm-1K-1. Even though the electrical conductivity is decreased from 74000 Sm-1 to 14000 Sm-1, a largely enhanced figure of merit of 1.21 at 773 K still can be obtained for the sample hot-pressed at 943 K. Therefore, introducing the disordered structure into an ordered structure can be considered as an effective way to enhance the figure of merit.
Environmental Friendship Synthesis of Ultra-Fine Silver Particles for Electromagnetic Shielding Materials
Authors: Yang Ming Shan , Li Lin Kai
Published: July 2012

A room-temperature ionic liquid, 1-n-butyl-3-methylimidazolium tetrafluoroborate([bmim]BF4), was synthesized with two-step method, and putting p-benzenediol and AgNO3 ethanol solution into [bmim]BF4, ultra-fine silver powder were prepared successfully in this paper. The effects of the temperature and material mol ratio of AgNO3 and p-benzenediol on the shape of products were studied. The products were characterized by XRD, SEM, IR and TEM. The results showed that the particle size of silver was much smaller and in the range of nanometers, and had narrowly, uniform distribution, which indicates that the synthesis method using ionic liquid, is the better “green” and “environment friendship” method to prepare ultra-fine silver powder for electromagnetic shielding.
Measurement & Control of Pulverized Coal Concentration in Exhaust Pneumatic Convey System
Authors: Yang Xing Sen , Yin Jing
Published: July 2012

Pulverized coal firing boilers are widely used in power plants. Coal is pulverized into very fine particles and then mixed with primary air in horizontal pipes in the case of exhaust pneumatic convey system. The pulverized coal particles are conveyed by primary air to the burner and burn in the furnace. The concentration of pulverized coal in primary air should be well controlled to keep the safe and economic operation of the boiler. Credible measuring and controlling system is needed in engineering applications. Investigation of the mixing process shows that the pressure of primary air drops rapidly within the process, which gives the possible way to determine the pulverized coal concentration. The rapid pressure drop is mainly due to the acceleration of the pulverized coal particles. With energy balance analysis, study of the relationship between the mass flow rate of the pulverized coal and the pressure changes within the mixing process is done. The governing equation is achieved and the method of using two sections to measure the flow is proposed. The measuring and controlling system can be established according to the method. As a result, the measuring and controlling method provides a new way to meet the needs of engineering application.
Knowledge Representation for Process Planning of Mechanical Parts Based on Ontology
Authors: Zhu Wen Bo , Lin Xian Kun , Chen Long , Gan Yi
Published: July 2012

The idea of ontology is introduced into knowledge representation for process planning of mechanical parts to support knowledge sharing and reuse, which means knowledge is expressed abstractly as domain ontology according to the characteristics of process planning of mechanical parts. Process planning domain ontology is an explicit and elaborate description of a conceptualization in the process planning domain, i.e. it is with five elements: concepts, relations, attributes, rules and cases. Domain ontology is constructed by abstracting and describing the five elements from process planning, and is stored within relational database. An example is included to demonstrate the operation of the proposed approach and show effectiveness in knowledge representation for process planning of mechanical parts.
Monitoring Volatile Organic Compound by Visual Recognition Technology of Application
Authors: Chen Mei Yung , Chen Hsi Che
Published: July 2012

To recognize volatile organic compound for colorimetric sensor array which constitute with chemical dyes. The rapid and low cost system can identify dilute compound. Every different compound is presented specified color on the colorimetric sensor array. In this research, we use CCD (charge couple device) to clearly classify the change of color on base, and make sure what the compound would be by Neural Network model. Based on the experimental result, we totally test for 33 group data, and precisely classify all type of volatile organic compound. It’s successfully to achieve the target in this research.
Research on Execution Process Monitoring for Curved Block Construction
Authors: Lei Jin Fan , Wang Ai Min , Zhou Jian , Li Zhou Yu
Published: July 2012

According to the current production situation of Chinese shipyards, this essay has made an in-depth study of execution process monitoring technology in block construction. Several key issues are discussed to implement the informatization and visualized display of execution process monitoring during the block construction period of shipbuilding. A prototype system is designed and developed to verify in practice. It realizes the management of the whole execution process and graphical display of yard and curved block.
Research on Signal Transmission Mode of Underground Based on Power Carrier
Authors: Bai Shan , Du Peng , Shi Sheng Lei
Published: July 2012

During the process of oil collection, treating power cable for the supply of electrical submersible pump unit as the medium of the underground signal transmission to the ground, it has broad application prospects and economic value. But there is large distance between down-hole devices and ground equipment, and electrical submersible pump unit condition monitoring system measures many parameters, and there is a converter of harmonic interference, therefore, it restricted the application of the underground power line carrier communication technology severely. Designing an overall plan for signal extraction and transmission system in the paper. Based on the low-frequency power line carrier technology developing a practical communication protocol, to ensure the reliability of communication.
The Research on Multi-Level Theses Evaluation Model Based on Fuzzy Cluster Analysis
Authors: Li Xiao Ping , Chen Si , Cui Hui Jie , Liang Chun Hui , Liu Feng , Mao Xu , Wang Zheng Hong
Published: July 2012

The traditional process of thesis evaluation is of subjectivity and differences of teachers’ qualifications and backgrounds. Considering these characteristics, this paper proposes a multi-level theses evaluation model based on fuzzy cluster analysis with the idea of fuzzy mathematics. In this model, it evaluates the teachers’ qualification first to determine the weight of various teachers’ evaluation to the thesis; then stratifies theses evaluation indicators, and according to the results of various indicators, it builds a fuzzy equivalent matrix, and ultimately selects the appropriate similarity coefficient to divide the theses into excellent, good, moderate, bad four grades. This model greatly improves the scientificalness and objectivity of the traditional theses evaluation process and provides a reference for the process.
AMESim Based Numerical Analysis for Electrohydraulic Exciter Applied on New Tamper
Authors: Han Dong , Gong Guo Fang , Liu Yi
Published: July 2012

Tamper, the core equipment of tamping vehicle, is used to complete the work of maintenance and construction in the railway field. Based on international tamping technology and existing problems, a new type of electrohydraulic exciter applied on the tamper is proposed. It mainly consists of spin valve with high speed and micro-displacement double-functioned hydraulic cylinder. In this paper, AMESim Based Dynamic Modeling is carried out to early explore the relationship between operating frequency, axial conducting width of valve orifice and the displacement, velocity, acceleration, vibration force, load pressure, load flow rate. The results indicate that the new electrohydraulic exciter can meet the design requirement well and realize the flexible adjustment of amplitude and frequency through rotational speed control of step motor. Therefore, it adapts to different working environment including hardened ballast and loose ballast. This simulation can not only enrich relative researches of electrohydraulic exciter, but also provide theoretical foundation and practical direction for optimization of device design.