bluuebunny/crossref_metadata_2025 huggingface dataset:
Une enquête sur les usagers des CAF dits « à faible niveau d'autonomie administrative »
Authors: Caizzi Andréa , Quiroga Armelle , Riondel Jean-François
Published: July 2013

Dix caisses d'Allocations familiales ont conduit, en 1996, une enquête sur les relations avec les usagers dits « à faible niveau d'autonomie administrative », avec l'objectif d'identifier les causes des dysfonctionnements dans la gestion des droits ou dans la relation avec les allocataires. Il s'agissait pour elles de mieux connaître les raisons qui empêchent certains allocataires d'avoir une relation administrative satisfaisante. La confrontation des points de vue de l'allocataire et de l'agent de la CAF sur les modalités de gestion des droits met en évidence l'influence considérable que les représentations réciproques des agents et des allocataires ont souvent sur la qualité de la relation administrative construite au fil du temps. Par ailleurs, la difficulté qu'éprouvent l'agent et l'allocataire à porter une appréciation globale sur les situations est également soulignée. Enfin, la complexité de la législation et l'inadaptation des notifications multiplient les obstacles jusqu'à rendre l'information inefficace.
Qui doit garder le jeune enfant ? Les représentations du travail des mères dans l'Europe en crise
Authors: Jenson Jane , Sineau Mariette
Published: July 2013

Les fondements idéologiques et les systèmes de légitimation de la division sexuelle du travail sont dévoilés par la production des lois qui ont trait aux allocations et aides diverses en direction des modes de garde de la petite enfance. Mises à mal par la montée du néolibéralisme de cette fin de siècle, les politiques publiques des modes de gardes vont, en Europe, subir une restructuration accompagnée par des mutations dans les représentations du travail des mères. A travers ces évolutions, les valeurs attachées à la citoyenneté sont menacées, en particulier celle de l'égalité homme/femme devant l'emploi.
L'école maternelle en France : normes éducatives et socialisation après la Seconde Guerre mondiale Une analyse de la situation en milieu urbain
Authors: Plaisance Eric
Published: July 2013

Les normes éducatives de l'école maternelle et, corrélativement, la socialisation scolaire du jeune enfant sont analysées dans leur évolution depuis 1945 jusque dans les années quatre-vingt-dix. Au-delà des prescriptions officielles du ministère de l'Education nationale qui proposent des objectifs et des activités, l'étude des rapports d'inspection dans les classes, entre 1945 et 1980, met en évidence une succession de « modèles éducatifs » avec leurs visées normative et sociologique. La maternelle semble surtout « pilotée » par son intégration dans le système éducatif et sous l'influence de l'école élémentaire. En revanche, la crèche, au cours de la même période, est un lieu où l'on peut surtout repérer la nouvelle représentation du jeune enfant comme « objet culturel », que l'on retrouve toutefois aussi en maternelle.
Normes et politique familiale : la question du libre choix du mode de garde
Authors: Boyer Danielle
Published: July 2013

La notion de « libre choix » du mode de garde des enfants apparaît comme un véritable leitmotiv des discours et des études sur les politiques de la petite enfance. S'interroger sur cette notion peut permettre de saisir les logiques qui sous-tendent les orientations politiques en matière d'accueil des jeunes enfants. Ces logiques apparaissent comme indissociables de valeurs s' appuyant sur des principes politiques et sociaux libéraux. En outre, elles renvoient encore largement à des représentations attribuant quasi exclusivement la garde des enfants aux femmes.
Se construire comme jeune adulte [Autonomie et autonomisation des étudiants par rapport à leurs familles]
Authors: Cicchelli Vincenzo , Erlich Valérie
Published: July 2013

L’accès d’une fraction croissante de la jeunesse à l’enseignement supérieur et l’allongement de sa présence au sein des institutions scolaires concourent à maintenir les jeunes dans un état de forte dépendance à l’égard de leurs familles. Dans ce contexte d’étirement de la socialisation familiale qui se traduit par une forte propension des parents à prendre en charge matériellement les études de leurs enfants, le processus de construction de l’identité autonome des étudiants devient un objet d’étude des plus pertinents pour une sociologie de la jeunesse. Ceci d’autant plus que l’autonomie est un phénomène multiforme, aux frontières floues. On peut opposer les étudiants qui vivent chez leurs parents, et sont totalement pris en charge par eux, à ceux qui sont parvenus à combiner les études avec une activité professionnelle relativement stable et qui vivent dans un logement indépendant avec leur conjoint(e). Mais, entre ces deux extrêmes, il existe une série de situations contrastées qui doivent être analysées et qui demandent l’élaboration de concepts adéquats afin de mieux comprendre quelle est la place des jeunes adultes au sein des échanges entre générations.
Synthesis and biological activities of the respiratory chain inhibitor aurachin D and new ring versus chain analogues
Authors: Li Xu-Wen , Herrmann Jennifer , Zang Yi , Grellier Philippe , Prado Soizic , Müller Rolf , Nay Bastien
Published: July 2013

Aurachins are myxobacterial 3-farnesyl-4(1H)-quinolone derived compounds initially described as respiratory chain inhibitors, more specifically as inhibitors of various cytochrome complexes. They are also known as potent antibiotic compounds. We describe herein the first synthesis of aurachin D through a key Conrad–Limpach reaction. The same strategy was used to reach some ring as opposed to chain analogues, allowing for the description of structure–activity relationships. Biological screening of the analogues showed antiparasitic, cytotoxic, antibacterial and antifungal activities, and depletion of the mitochondrial membrane potential. The strongest activity was found on Plasmodium falciparum with a selectivity index of 345, compared to Vero cells, for the natural product and its geranyl analogue. The loss of mitochondrial membrane potential induced by aurachins in human U-2 OS osteosarcoma cells was studied, showing the best activity for aurachin D and a naphthalene analogue, yet without totally explaining the observed cytotoxic activity of the compounds. Finally, a synthetic entry is given to the complete carboheterocyclic core of aurachin H through the N-oxidation/epoxidation of aurachin D and a shorter chain analogue, followed by subsequent biomimetic cyclization.
Vers un ethnoburb à la française ? Ancrages et diffusions des étrangers acquéreurs de biens immobiliers en Île-de-France
Authors: Desponds Didier , Bergel Pierre
Published: July 2013

Aborder les transformations de la société sous l’angle des nationalités suscite des inquiétudes en France. Ces réticences dépassées, la difficulté demeure de mobiliser les données permettant de discerner les dynamiques à l’œuvre. Cet article s’appuie sur la base bien de la Chambre des Notaires de Paris, pour appréhender les logiques de distribution spatiale des acquéreurs de biens immobiliers de nationalité étrangère au sein de trois départements de la région Île-de-France. Discerne-t-on des spécialisations, ou des formes d’association, selon la nationalité ? La méthode quantitative employée cerne, à différentes échelles, les transformations en cours dans les périphéries parisiennes. Ces mobilités résidentielles résultent des stratégies complexes des ménages acquéreurs, ce qui requiert une approche qualitative. Ces transformations interrogent la pertinence de l’adoption du concept d’ ethnoburb de Li Wei dans le contexte francilien.
Géopolitique et métropolisation, le rôle de « minorité intermédiaire » des Juifs d'Istanbul
Authors: Morvan Yoann
Published: July 2013

Cet article retrace les parcours résidentiels et identitaires des Juifs d’Istanbul, leurs trajectoires dans la mégapole turque et dans les différentes diasporas , suite à leurs migrations successives : Israël, France, Espagne, Amériques du nord et du sud. Il repose sur une enquête ethnographique menée au sein de la communauté entre avril 2009 et novembre 2012. À travers le concept de « minorité intermédiaire », il analyse l’évolution du rôle commercial des Juifs dans la métropole stambouliote à l’ère de la mondialisation. L’articulation entre la structure sociale interne de la communauté, notamment en matière de hiérarchie et de don, et son rôle externe permet de dresser une anthropologie économique de la minorité. Le concept de « minorité intermédiaire » révèle indirectement le processus de métropolisation d’Istanbul.
Images de lieux, stigmates et représentations de la pauvreté urbaine à Mexico
Authors: Bayón María Cristina , Jezioro Etienne
Published: July 2013

Les relations entre les dimensions sociale, spatiale et symbolique de la pauvreté et les inégalités urbaines sont étudiées à partir d’une perspective qui analyse la pauvreté comme un phénomène socialement construit et complexe. Cet article explore, à partir des récits des résidents d’une localité périphérique de la ville de Mexico, la manière dont la société se représente les pauvres et la pauvreté et comment elle entre en relation avec eux. On y remarque que les expériences, les perceptions et les images de lieux sont marquées par des stigmates territoriaux et par des conceptions qui tendent à rendre les pauvres coupables de leur situation. L’auteur souligne la naturalisation des inégalités et le niveau élevé de leur acceptation dans la société mexicaine, et met en relief les conséquences négatives de cette situation sur le vivre ensemble.
Horizons du mariage et critères de légitimité sur trois générations : établir, retenir et consentir
Authors: Ramos Gil Irene
Published: July 2013

Cet article présente des récits de mariages d’hommes et de femmes vivant dans un village de la Costa Chica du Guerrero, recueillis au cours d’une recherche ethnographique. Leurs récits font transparaître des unions de différentes formes sur trois générations ainsi que la transformation des rapports d’autorité entre parents et enfants. L’autorité des parents qui prévalait dans la génération des grands-parents a été critiquée de façon persistante et par conséquent fragilisée, donnant lieu à l’acceptation de l’initiative des enfants pour choisir le moment, la façon et la personne avec qui ils se marieront. Cette transformation de la hiérarchie familiale est intelligible au travers des critères qui guident le jugement des acteurs de chaque génération quant à la légitimité du mariage : établir, retenir et consentir.
Crime, respect et jeux de pouvoir dans les Maras salvadoriennes
Authors: Martinez Juan , Moallic Benjamin
Published: July 2013

L’article décrit la relation entre la violence et le pouvoir à l’intérieur des pandillas du Salvador. Il met en évidence le rôle qu’occupe la violence dans leur système hiérarchique, et l’importance fondamental de celle-ci pour les pandilleros qui cherchent à escalader la hiérarchie. L’entretien du système d’agressions réciproques entre les pandillas fait partie de la logique de fonctionnement des gangs, et c’est précisément ce système qui permet la rotation des hiérarchies à l’intérieur des cellules (clicas). D’autre part, bien que la violence et la brutalité avec laquelle elle est exercée soit fondamentale pour escalader les positions de pouvoir, d’autres ressources permettent également ce mouvement ascendant, telles que les capacités administratives et le réseau de contacts. Les pandillas sont des groupes complexes qui articulent un ensemble d’éléments culturels et symboliques en marge de l’État et de la société.
Effect of training on intrinsic and resting heart rate and plasma volume in young and old horses
Authors: Betros C.L. , McKeever N.M. , Manso Filho H.C. , Malinowski K. , McKeever K.H.
Published: July 2013

The chronic bradycardia seen in several species after intense exercise training may be due to autonomic mechanisms, non-autonomic mechanisms, such as increased pre-load, or a combination of the two. Thirteen, healthy, unfit Standardbred mares were split into two groups: young (age 12±1 yr; mean ± standard error, n=8) and old (age 22±1 yr, n=5) to test the hypothesis that there would be age and training related differences in resting heart rate (RHR), intrinsic heart rate (IHR), maximal heart rate (HRmax) and plasma volume (PV). Mares were trained 3 d/wk at 60% HRmaxfor 20 min and gradually increased to exercising 5 d/wk at 70% HRmaxfor 30 min and RHR, IHR, HRmax, and PV were measured prior to and after the 8 wk training period. There were no age related differences (P≯0.05) between young and old mares before (41±2 vs. 42±2 beats per minute (bpm); 86±5 vs. 80±4 bpm) or after training (35±1 vs. 34±1 bpm; 81±6 vs. 78±2 bpm) for RHR and IHR respectively. RHR was decreased (P<0.05) following training in both the young (41±2 vs. 35±1 bpm) and old mares (42±2 vs. 34±2 bpm). Training decreased IHR (P<0.05) in the young mares (86±5 vs. 81±6 bpm), but not (P≯0.05) the old mares (80±4 vs. 78±2 bpm). The young horses had a higher HRmaxthan the old horses (P<0.05) both before (216±5 vs. 200±4 bpm) and after training (218±3 vs. 197±5 bpm). Maximal heart rate was not altered after training (P≯0.05) in either young (216±5 vs. 218±3 bpm) or old (200±4 vs. 197±5 bpm) mares. The PV of the young mares was 15% higher before training and 32% higher after training when compared to the old mares (P<0.05). Training caused an increase in PV in young mares (+9%;P<0.05), but did not alter PV in old mares (-5%;P≯0.05). Training improved RHR in the young but not the old horses. The decrease in measured parameters in the young horses appears to be related to enhanced pre-load associated with a training-induced hypervolemia as well as changes in autonomic function.
Motivating Students to Develop Satellites in Problem and Project-Based Learning (PBL) Environment
Authors: Jesper Larsen Abilgaard , Nielsen Jens Frederik Dalsgaard , Zhou Chunfang
Published: July 2013

During the last decade, a total of three student satellites have been developed by engineering students in a Problem and Project-Based Learning (PBL) environment at Aalborg University (AAU), Denmark. As solving such a complex project, we emphasize that a high level of motivation is needed for the students. Thus some efforts have been done on project management style with this aim. However, it is necessary continuous to discuss this issue from the students’ perspective for a better PBL environment. This leads to the research question of how the students perceive their motivation in developing satellite projects in a PBL environment. Empirically, a total of 12 student participants were interviewed. The results show that students’ motivation is highly stimulated by the project management with a series of factors, such as the task characteristics, support of peers, help of supervisors, and openness, etc. However, the time schedule is a barrier to motivation. Thus, the supervisors are suggested to be more aware of the complex relationships between student, teacher, tasks and the students’ response.
Design of Warehouse Temperature and Humidity Detection System
Authors: Wang Xin , Pan He , Gao Hong Yan
Published: July 2013

With the wide application of temperature and humidity detection system, the requirements and standards of which in different industries and fields are various. After the analysis of domestic and foreign warehouse intelligent temperature and humidity control, the author has found a series of factors of that, and then puts forward a design of scheme of temperature and humidity detection system based on AT89S51, together with a plurality of digital temperature sensor DS18B20 and the humidity sensor HS1101, temperature and humidity detection system is formed.
A Survey of Research and Application of Engine Vibration Control System Actuators
Authors: Sun Guo Chun , Guo Hui , Si Jin
Published: July 2013

Because the passive mount could not meet the requirements of vibration isolation and noise reduction for vehicle, the semi active mount and active mount were considered as the developing trend of reducing vibration and noise. An active vibration control system consists of a sensor and an actuator together with a control unit. The development of the systems is often limited by the chosen actuator technology. This article list the common engine vibration control system actuator, analyzing their respective performance summed up their role in the control of vibration and trends.
A Lightweight of Cluster-Based Key Management Scheme for Wireless Sensor Networks
Authors: Song Yong Lei , Cao Shu Guo
Published: July 2013

According to the existing problems in current key management strategy of wireless sensor networks, which have computation complexity, multi-memory space and inflexible management, this paper proposed a lightweight of cluster-based key management scheme for wireless sensor networks. Implementing the EBS(exclusive basis system) in the cluster heads communication, it could effectively enhance the ability of the resilience. Using Chinese remainder theorem in sensors communication, it will have less storage consumption, Lower communication and computational overhead. Under comparative analysis, it meets the needs of the WSNs key management and provides the better connectivity as well as the resilience compare to other key management schemes.
Sensitivity Analyses of Steam Generator Tube Thickness on Induced-SGTR in SBO Accident
Authors: Qiu Jin Rong , Peng Chang Hong , Guo Yun
Published: July 2013

For nuclear power plant, station black-out (SBO) is the events that contribute significantly to the level-I core damage risk. For an SBO, it is assumed that both the off-site power and on-site diesel generators fail to supply alternating-current power for the plant systems. SBO induced steam generator tube rupture (SGTR) is a concern because the steam generator (SG) tubes are parts of the reactor coolant pressure boundary and failure of the SG tubes may lead to fission products bypassing the containment. The SG tube integrity may be challenged by high temperature and high pressure conditions and may have a potential to fail due to creep rupture. This study focuses on the probability of SBO induced SGTR accidents under the station blackout (SBO) with RCS integrity, seal LOCA and steam relief valves remaining stuck open for the reference plant. At last, the sensitivity of the tube thick is studied.
Research on Optimization of Renewal Project Planning System of the Industrial Cities
Authors: Chen Ling Ling , Qu Hong Chang , Huang Kai Ping
Published: July 2013

The urban renewal is not a simple reconstruction by demolition for the urban material substances, but its a kind of the artificial behavior to promote solution of various problems which can affect and hinder the urban development and obtain sustainable development. The renewal project planning of the industrial cities is a continuous, dynamic, long-term development process, in this process, emphasizing the application of the optimization of the forward-looking, dynamic and comprehensive renewal planning system has an important guiding significance on the sustainable development of the cities.
Study of Casting Self-Colored Liquid Crystalline Solid Films of Hydroxypropyl Cellulose
Authors: Zhang Qin Xing , Qian Li , Wang Li Xia , Stuto S. , Shen Chang Yu
Published: July 2013

Solutions of lyotropic cholesteric liquid crystalline hydroxypropyl cellulose (HPC) in water would be self-colored due to the selective reflection of visible light, depending on the solution concentration. Colored coating of the liquid crystalline aqueous HPC solutions was attempted to apply. HPC solid films were found which could cast from the liquid crystalline solutions at different conditions such as solution concentration and different drying temperature. Experiments show that both solution concentration and cooling velocity play an important effect in controlling the color of HPC films.
Electrochemical Activity of Multilayer Films of Carbon Nanotubes and Redox Polymer
Authors: Sha Yu Fang , Hu Yan Chun , Sun De Xiang , Guo Yong Sheng , Zhang Bing
Published: July 2013

Multilayer films containing carbon nanotubes and redox polymer were successfully fabricated on a screen-printed carbon electrode using layer-by-layer (LBL) assembled method. UV-vis spectroscopy and electrochemical method were used to characterize the assembled multilayer films.
Graphene Oxide Reduced and Dispersed by Polysaccharide
Authors: He Yong Qiang , Li Ru Qiang , Wu Di , Zhang Yong Li , Gao Jian Ping , Yan Jing
Published: July 2013

An green method to reduce graphene oxide (RGO) was developed by using polysaccharide as both a reducing agent and a stabilizing agent. The RGO was characterized and the factors that affect the reduction of graphene oxide (GO) were explored to obtain optimum reaction conditions. Analysis shows that GO can be reduced at a comparatively low temperature by polysaccharide and forms a stable RGO aqueous dispersion owing to the dispersion of polysaccharide. This approach provides a new green method for GO reduction that has great value for graphene applications.
Research on Structure Size of Muffler to the Influence of Acoustic Properties
Authors: Li Jin Ku
Published: July 2013

The dimention for muffler has great impact on the car engine. Based on software GAMBIT, GT-POWER,SYSNOISE,through comprehensively using finite element and boundary element method,simulating and analyzing the acoustic performance for the basic noise reduction unit,establishing the finite element model, comparing the frequency and noise reduction of different volume ratio of cavity and throat tube.Simulation analysis and experimental results show that the resonant structure parameters have a direct effect on its resonant frequency and noise reduction amount. the relationship characteristic between them is that the ratio more bigger,the requency and noise reduction amount more bigger , too.And draw the two relation formulas through calculation.
Experimental Study on the Gas-Liquid Two Phase Flow of Air-Assist Boom Spraying
Authors: Yan Ming De , Mao Han Ping , Jia Wei Dong
Published: July 2013

The velocity and diameter distribution of the air-assist boom spraying is studied by a laser Phase Doppler Partic1e Analyzer when the operational parameters is changed, which including airflow velocity of air curtain and vertical relative position between the air curtain and the nozzle. From the experimental results, we find the as the air curtain velocity increases , the size distribution of the droplet is conducive to uniform . At the same air curtain velocity, droplet size decreases with increasing of nozzle pressure. On the right side of each measuring point, the number of droplets is gradual decreasing with the wind velocity increasing.When the working pressure is 0.5Mpa, the droplet size does not change with the change of the horizontal distance.
Load Model of Scroll Wrap for Calculation of Bending Fatigue Strength
Authors: Zhang Hua
Published: July 2013

For calculation of bending fatigue strength of scroll wraps, the pressure loads and temperatures in compression chambers based on general profile theory are analyzed, and a load model including the pressure loads the temperatures is proposed. For the scroll wraps, their load model for bending fatigue strength includes the pressure loads and the temperatures. Their pressure loads can be simplified on the mid-areas and its temperatures are equal to the temperatures of the mid-areas. The pressure loads are of π normal angle region inner pressure load which have an interval of π normal angle, the number of regions of pressure load is equal to the number of scroll compression chamber pairs. The discharge angle has significant effect on bending fatigue strength of scroll wraps and the stability of scroll compressor.
Safety CAE Finite Element Calculation for Pressure Cooker of Plateau Field Kitchen Unit
Authors: Yang Han , Wang Lu Hui , Wang Ying Ze , Zhang Xiang Hong , Liu Xue Qiang
Published: July 2013

The core equipment of plateau field kitchen unit is pressure cooker for staple food, the safety and reliability of which are the key of this project, and therefore, mechanics modeling analysis is carried out. The working theory of pressure cooker is to increase the boiling point of water by enhancing the pressure inside the cooker, so as to speed up the cooking process. In fact, the pressure cooker is a small-scale pressure container when using, normally its working pressure reaches some tens and hundreds Kpa. People pay more attention to its safety and dependability. The traditional way to increase the bearing capacity of container is usually to thicken the wall of container, by doing so, not only the manufacturing cost is increased, but also the weight, thus it is inconvenience in using and bringing. Therefore, in order to make optimum structural design of pressure cooker, reliable analysis on mechanical strength and stiffness are carried out.
Gradual Change Reliability Sensitivity Design for Tool Based on Measured Information
Authors: Wang Bao Yan , Wang Xin Gang
Published: July 2013

It brings certain error to reliability design of mechanical components that now most reliability design aiming at establishing pure theoretical mathematical model, without considering arbitrary distribution and variation rules of parameters. In this paper, the variation rules of strength and load effect are studied, the computational method of gradual change reliability is given. By combining the theory of reliability design with the method of sensitivity analysis, the restrictions on random variable distribution types are loosen, the gradual change reliability sensitivity design method with arbitrary distribution parameter is proposed based on the measurement information. Under the circumstance that knowing the first four order moments of basic random parameter, reliability sensitivity design with arbitrary distribution parameter can be brought about by using computer program, which provides the theoretical basis for structural design and life forecast of mechanical components.
On Non-Linearities Separate Modeling Method and State Feedback Control
Authors: Han Zhong Xu , Tian Xin Shou
Published: July 2013

Modeling method of non-linearities objects controlled have more problem and difficulty. Based on the increment function observer (IFO-Kx), this paper gives the mathematical conceptions of Increment Function Observer with variable gain IFO-K(T(t)) x and the Increment full dimension State Observer with variable gain ISO-T(t) x, which makes the application of increment observer extending to non-linear slow-time-varying controlled system. In this paper, the sufficient condition of IFO-K(T(t)) x and ISO-T(t) x is presented, and comparing this condition with the sufficient and necessary condition of increment function observer, the useful conclusion for practical engineering can be obtained that the design of increment observer can avoid seeking the solution of Sylvester matrix equation, which provides the more maturity theory foundation for the engineering application of incremental observer.
Axisymmetric General Steady-State Solution for Poroelastic Media
Authors: Zhao Bao Sheng , Lu Gui Xian , Wu Xiue
Published: July 2013

In this paper, the axisymmetric general steady-state solution for porous media is presented. And the completeness of the P-Ns representation for the axisymmetric displacement field equation is proved directly from the equations governing the displacement field, which can be applied to homogeneous and isotropic poroelastic materials. At last, the Boussinesq general solution and Timpe general solution are obtained from P-N General Solution.
The Study and Implementation of Virtual Endoscopy Based on VTK 3D Surface Rendering
Authors: Lu Xiao Qi , Wang Cheng Li , Gu Yu , Jia Dong Zheng
Published: July 2013

Virtual Endoscopy is a new non-invasive inspection method, it gets the body's two-dimensional slice data by CT, MRI and collects volume data to generate three-dimensional model of the various organs of the body, then three-dimensional model generates visual display, glimpses the roaming function. This article imitates camera model by visualization toolkit, using flexible keyboard and mouse to control the virtual camera to roam in the trachea, having achieved the visualization of virtual endoscopy. Virtual endoscopy has broad application prospects in the realization of the virtual medical diagnostic virtual therapy and virtual teaching.
Modeling Elastic Stability of a Pressed Box Girder Flange
Authors: Djelosevic Mirko , Tanackov Ilija , Kostelac Milan , Gajic Vladeta , Tepic Jovan
Published: July 2013

The paper examines the elastic stability of pressed sheet metal flange of a box girder. Mathematical interpretation of elastic stability is performed on the model plate with two freely supported and two elastically restrained edges subjected to combined loads. The research is based on the energy analysis approach, using the principle of minimum deformation energy and the method of cross-sectional girder element decomposition. The plate elastic stability mechanism is investigated in an interactive environment that simulates local loads and compressive longitudinal forces produced by global stress. The significant geometric parameters, as well as support and load conditions affecting the loss of stability, are identified. The research results can be applied as a constraint on the local flange stability in the optimization of box girders.
Seismic Behaviour of Precast Reinforced Concrete Beam-Column Connections: A Literature Review
Authors: Poluraju P. , Appa Rao G.
Published: July 2013

Precast construction is gaining importance during recent past. Most of the studies reported on precast beam-column joints are to select the appropriate connections to be adopted particularly for regions of low to moderate seismicity. This paper reports on a comprehensive review of literature on the investigations carried out to analyze and evaluate the behaviour of precast concrete structural systems assembled with typical connections or joints under simulated earthquake loading. The seismic performance of precast concrete structure very much depends on the ductility of the joints framed by precast beams and columns. It has been understood that (1) moment resistance beam-column connection and (2) ductile connectors seems to be the most widely used in the precast construction in seismic regions. Further, refinement and research could be carried out in order to optimize such connections to be recommended in low seismicity regions.
Based on FPGA Intelligent Physiological Parameters Acquisition
Authors: Hu Shun Ren , Gan Ya Chen , Bao Ming , Wang Jing Wei
Published: July 2013

For the physiological signal monitoring applications, as a micro-controller based on field programmable gate array (FPGA) physiological parameters intelligent acquisition system is given, which has the advantages of low cost, high speed, low power consumption. FPGA is responsible for the completion of pulse sensor, the temperature sensor, acceleration sensor data acquisition and serial output and so on. Focuses on the design ideas and architecture of the various subsystems of the whole system, gives the internal FPGA circuit diagram of the entire system. The whole system is easy to implement and has a very good promotional value.
Study of Active Disturbance Rejection Control in Aero-Engine
Authors: Jiang Jiu Long , Li Xue Ren , Du Jun , Wu Chen
Published: July 2013

The control problem of certain type of aero-engine is studied in the article. And active disturbance rejection control (ADRC) is applied into the control of aero-engine. In light of the problem of parameter optimization in ADRC, through the principle of parameter optimization analysis, rule of parameter optimization is revealed in this article. Based on parameter optimization rule, an adaptive parameter optimization law is designed to optimize the parameter of ADRC by on-line adaptive parameter tuning method. Some conclusions are suggested by the simulation result: compared with PID controller, that the ADRC controller is proved better in responding time, overshoot, steady-state error, disturbance rejection performance and control performance.
Free Surface Green Function Research Based on Cloud Computing for Ship Movement on the Water
Authors: Zhang Cong , Wang Xin , Zhao Jie , Zhang She Sheng
Published: July 2013

In order to easy use Green function on cloud computation, the author consider control equation of point source with free surface, and discuss the representation of Green function on cloud computation, and then propose the discrete calculation expression as well as the calculation procedure. Finally, the two-dimensional graphics of the Green functions real and imaginary parts are plotted.
Research on Method of Property Verification of Multi-Agent System CGF Architecture Model
Authors: Chen Jian , Yang Yan Li , Liu Zhi Guo
Published: July 2013

When Multi-agent system theory is used to the research of CGF(Computer Generated Forces), making up a correct and believable model is critical. In this article, we deal with the foundation,exit and update of Agent as well as the reconfiguration of system framework of CGF aiming at the problem of model evolvement caused by many Agent in CGF system always changing and show the validity of the model using INA.
Cylinder Flow Simulation of Liquid Nitrogen Engine Based on STAR-CD
Authors: Tian Cheng Zhan , Yuan Guang Jie , Chen Guo Jin
Published: July 2013

Liquid nitrogen engine is a new type of cryogenic engine with zero discharge. In order to gain a better understanding of the cylinder flow field, we simulate the velocity field and turbulent kinetic energy field of the cylinder, and the relationship between pressure and the crank angle in different intake pressure by using STAR-CD in this paper. The simulation results are compared with experimental results.
Multilayer Ultrasonic Echo Structured Sparse Model and its Application
Authors: Lei Zheng Wei , Niu Man Ke , Hua Xiang
Published: July 2013

The effective separation of the multilayer ultrasonic echo is the key for layered defective imaging and feature information identification; it is an urgent bottleneck problem to be addressed in the multilayer ultrasonic echo processing field. In this paper, starting from sound-electric equivalent model of ultrasonic echo, combining with multilayer signal features, a structured sparse model of multilayer ultrasonic is built. Studies have shown that multilayer ultrasonic echo could be characterized as Hankle matrix and Toeplitz matrix separation and recognition model. This can be applied to multilayer ultrasonic stress detection field for metal matrix composites structure.
An Novel Binarization Algorithm Based on Wavelet and an Optimal Box Counting Fractal Dimension for MEMS Measurement
Authors: Luo Yuan , Tang Xue Qiang
Published: July 2013

In MEMS parameter measure based on vision,the process of binarization is critical. In the situation of unbalancing illumination and noise background,the performance of traditional binarization method degrades. In this paper, a binarization method based on wavelet analysis and an optimal box counting (OBC) fractal dimension algorithm is proposed. At first,wavelet analysis is used to eliminate the effect of illumination distribution.Then the MEMS image binarization based on OBC reduces the effect of noise. Experiments show that, the method can get a considerable binarization result.
3D Digitization of Human Body Based on Checkerboard Matching
Authors: Li Jian , Zhang Cheng Yan , Xu Xue Li , Chen Hai Feng
Published: July 2013

A body-size measurement method based on checkerboard matching is proposed. First, calibrated cameras are used to acquire two body images after projecting chess boards on human body with projector. Then, the parallax of the two images is got by feature extraction and stereo matching. Finally, we can calculate the 3D coordinates of the human body according to the principle of binocular vision to complete the acquisition of body size. The result shows that measurement error is ± 4%. This study can measure automatically and improve precision compared with traditional methods while it has low-cost, simple operation compared with the non-contact measurement. And the results accuracy can meet its general application in practice.
Investigation of Un-Vulcanized Natural Rubber by Means of Temperature Scanning Stress Relaxation Measurements
Authors: Wu Miao , Heinz Michael , Vennemann Norbert
Published: July 2013

Two different types of un-vulcanized natural rubber, air dried sheets (ADS) and SVR-3L block rubber, were investigated by a new testing method and the results are compared with other mechanical properties. It was found that green strength is strongly reduced if the sample is ther­mal­ly treated before testing. Presumably, the decrease of strength is caused by a decrease of branch points, mainly composed of phospholipids, which are linked to the a - terminal groups of the rubber molecules. The existence of two different types of branch points is indicated by relaxation spectra, obtained from temperature scanning stress relaxation (TSSR) measurements.
The Application of Combined GPS.RTK with Electronic Level on High-Precision Surface Monitoring
Authors: Li Yang Yang , Guo Wei Jia , Zhang Hao Qiang , Wei Zhong Ju
Published: July 2013

2351 working face of Daizhuang coal mine is paste filling working face, its mining method is full mining and full backfilling. It is expected that its surface deformation is very small and traditional surface deformation monitoring method is difficult to meet high-precision demand. In order to meet the high precision of measurement area in Daizhuang coal mine, the combination of GPS.RTK and electronic level were studied to measure filled working face, which has achieved good results.
Simulation and Tuning of Film Bulk Acoustic Resonator Filters with Different Ladder Topologies
Authors: Jiao Xiang Quan , Yang Jie , Zhang Rui , Zhong Hui , Shi Yu , Shi Jun
Published: July 2013

Different topologies and tuning of ladder filter made up of film bulk acoustic resonator (FBAR) using Modified Butterworth-Van Dyke (MBVD) model is studied. The influence to the filter by singly adding series or shunt FBAR is separately simulated. The three-stage ladder filter with different topologies is especially investigated. The five-stage ladder filter is studied by changing the inherent components of Lm and C0 in the FBAR.
Robust Fault Detection during the Synchronization Process of Nonlinear Lur'e Dynamical Networks
Authors: Xu Shi Yun , Liu Jin , Sun Hua Dong , Yi Jun , Yang Zhao
Published: July 2013

The present study focuses on the robust fault detection issue within the synchronization process of nonlinear Lur'e dynamical networks. Sufficient conditions in terms of linear matrix inequalities (LMIs) are established to guarantee global robust synchronization of the network. Under such a synchronization scheme, the error dynamical system is globally asymptotically stable, the effect of external disturbances is suppressed, and at the same time, the network is sensitive to possible faults based on a mixedperformance.
The Design of Insulation Monitoring Device for Electric Vehicle's Battery Pack
Authors: Zheng Min Xin , Yang Qing Sen , Chen Shuo Ying
Published: July 2013

A novel insulation monitoring method which can monitor the insulation resistance between both the positive and the negative electrode of the electric vehicle's battery pack and the vehicle's body is proposed. The insulation monitoring method proposed in this paper is deduced theoretically, and the hardware and software design of an insulation monitoring device based on this method is given. The experimental results prove the correctness of the insulation monitoring method and the practicability of the insulation monitoring device.
Analysis of the Effect of the String Forcing Impact on the Piano Tempe Piano Rament
Authors: Lu Ting Ting
Published: July 2013

The temperament research is important to adjust accurately and stably the pitch of the piano. The purpose of the paper is to explore the scientific and effective temperament method. The piano temperament has inherited mostly the traditional temperament mode by the left or right hand for a long time. However, it is fuzzy that which kinds of the temperament methods have more advantages. Therefore, the stress of the strings was analyzed, and the traditional temperament methods were compared, so as to explore more scientific temperament method according with the stress rule of the string.
Calibrating Dual-Directional Couplers and Evaluating Uncertainties in Net Power Delivery
Authors: Li Jin Yuan , Xie Ming
Published: July 2013

Dual-directional couplers are used to monitor net power fed into transmitting antennas in standard-field systems at NIM, China. It is essential to calibrate the coupler and evaluate the measurement uncertainty in the net power in such applications. The method we use at NIM to calibrate couplers are presented in this paper, and a complete model that takes into account the measurement uncertainties of couplers and horns to evaluate uncertainties in net power delivery is proposed. A case study is also provided of power delivery by a coupler with the nominal directivity of 40 dB using the Monte Carlo analysis based on the complete model and actual measured data.
The Design of Control System about Crushers Based on PLC
Authors: Hou Jian Qiang , Wang Rui Hua , Lu Zhi Yuan
Published: July 2013

With Programmable Logical Controller (PLC) as the control core, this paper designed automation and control system of industrial. Protection and control of crusher stall is the main contents of this article. According to the control requirements of the industrial production process, stall control system of crusher was designed. This system included the liquid level monitoring of lubricating System, crushers start, crushers speed monitoring, crushers speed transformation and protection design of crushers stall. Then we simulated the functions which the system can achieve, and got the monitoring chart in the human-machine interface.
Spontaneous Combustion Characteristics and Air Leakage Control Technology of Half Isolated Island Fully Mechanized Caving Face
Authors: Mu Yu Bing
Published: July 2013

The 3-105 half isolated island fully mechanized caving face in Tengdong coal mine which in complex geological and high temperature condition, has a spontaneous combustion feature that is different from normal advancing mechanized caving face, such as slowly advance speed, stress concentration and air leakage of inside-impending gob. To overcome the dangerous possibility of spontaneous combustion between the roof coal seam inside-impending gobs, small coal pillar and adjacent gob of half isolated island fully mechanized caving face, analysis spatial structure of overlying strata roof and spontaneous combustion characteristics. Based on the result of pressure can be measured and tracer gas test of air leakage channels, determine the potential air leakage areas. The MEA plugging wind material is pumped into roadway and SPA-4 plugging wind material is spray around known air leakage or high temperature area to eliminate the hazards of spontaneous combustion of the potential danger zone, and protects the safe mining of the working face.
Thermo-Responsive Supramolecular Hybrid Hydrogels Formed by Graphene Oxide-Grafted-Poly(Ethylene Glycol) and α-Cyclodextrin
Authors: Kong Song Hua , Zhou Mi , Ye Xiao Feng , Qian Xin
Published: July 2013

Poly(ethylene glycol) methyl ether-grafted-graphene oxide (GO) was synthesized by a coupling reaction and formed inclusion complexes (ICs) after selective threading of the mPEG segments of the GO-mPEG through the cavities of α-cyclodextrins (α-CDs) units. The polypseudorotaxane structures of the as-obtained hydrogels were confirmed by X-ray diffraction, TGA, DSC, and SEM. The complexation of the mPEG segments with α-CDs and the hydrogen-bond interaction between CDs resulted in the formation of supramolecular hybrid hydrogels with a strong network. The resultant hybrid hydrogels were found to be thermo-responsive, and could be applied as a promising drug delivery system.
Research on the Test for Complete-Vehicle Emission and Fuel Consumption of the Refuse Truck by Chassis Dynamometer
Authors: Qin Kong Jian , Wang Chang Yuan , Yan Jia , Liu Xue Hao
Published: July 2013

Refuse truck accounted for 70% of the sanitation vehicle, which was the major heavy duty vehicle type in city. Therefore its fuel economy and emission characteristics were under higher requirements. This research did the emission test on the chassis dynamometer by using compressed truck, testing C-WTCV and CCBC circle emission, and fuel consumption respectively. The research showed the Km fuel consumption of CCBC circle was about 1.3 times of the C-WTVC from the analysis of fuel consumption and the emission of CO2.From the analysis of emission factor, the emission of NOX and CO of the CCBC circle was both higher than the C-WTVC, respectively 1.9 times and 1.4 times. However, the emission of HC was only 36% of the C-WTVC. C-WTVC was very similar to the motor of the CCBC circle in city, however the motorway cycle and emission both had significant difference from CCBC circle.
High Pressure Rotary Jet Grouting Pile with Undrained Caisson Combined Construction Technology on Nearby Yangtze River Levee Protection
Authors: Zhao You Sheng , Zhou Bin
Published: July 2013

t is easy to cause the Yangtze River embankment soil of slip even collapse to have a deep foundation pit construction adjacent to the Yangtze River outsideembankment,there are a lot of risk. In this paper, a new combining technique of construction for large caisson is presented. Based on the construction environment, theconstructiontechnology,the smaller earthwork excavation of deep high pressure rotary jet grouting pile with undrained caisson combined construction technology combined with monitoring data for the open caisson excavation control is adopted. It has achieved relatively good results and summarized the advantages of deep high pressure rotary jet grouting pile with undrained caisson combined construction technology in engineering application owing the reference value for engineering applications.
Performance Assessment on Vertical Stripes of Red, Green, and Blue
Authors: Jeon Gwang Gil
Published: July 2013

This paper discusses the issue of color interpolation on vertical stripe patterned color filter array (CFA), which is a process known as demosaicking. The objective and subjective performance are studied, and the results are displayed in the simulation result section. It was found to give superior performance and the satisfactory quality.
Research on the Performance of DSP Parallel System
Authors: Sun Xiao Qun , Wu Qiang , Li Xu Wen , Zheng Xin
Published: July 2013

This paper introduces the performance metric of DSP parallel processing system and presents a model of coarse-grained speedup of DSP parallel processing structure. Quantitative research is done according to the system performance index and target program features. This study simulates and analyzes different communication protocols and different influences of different degrees of parallelism on the parallel processing structure performances. Optimization direction of parallel processing system is put forward.
Comparative Analysis on Noise Processing of Image
Authors: Dong Hua Jun , Jiang Xue Mei , Niu Chen Xu
Published: July 2013

The existence of noises have great interference on image processing, so the elimination of image noise is of great importance. In this paper, based on the digital image processing, the methods of average filter, wiener filter, median filter, two-dimensional wavelet filter, maximum and minimum filter are used to eliminate the salt & pepper noise of image. Then we analysis and compare the results of the five methods to find the best way to eliminate the image noise.