bluuebunny/crossref_metadata_2025 huggingface dataset:
Tubular Urate Transporter Gene Polymorphisms Differentiate Patients with Gout Who Have Normal and Decreased Urinary Uric Acid Excretion
Authors: Torres Rosa J. , de Miguel Eugenio , Bailén Rebeca , Banegas José R. , Puig Juan G.
Published: August 2014

Objective.

Primary gout has been associated with single-nucleotide polymorphisms (SNP) in several tubular urate transporter genes. No study has assessed the association of reabsorption and secretion urate transporter gene SNP with gout in a single cohort of documented primary patients with gout carefully subclassified as normoexcretors or underexcretors.

Methods.

Three reabsorption SNP (SLC22A12/URAT1, SLC2A9/GLUT9, and SLC22A11/OAT4) and 2 secretion transporter SNP (SLC17A1/NPT1 and ABCG2/BRCP) were studied in 104 patients with primary gout and in 300 control subjects. The patients were subclassified into normoexcretors and underexcretors according to their serum and 24-h urinary uric acid levels under strict conditions of dietary control.

Results.

Compared with control subjects, patients with gout showed different allele distributions of the 5 SNP analyzed. However, the diagnosis of underexcretor was only positively associated with the presence of the T allele of URAT1 rs11231825, the G allele of GLUT9 rs16890979, and the A allele of ABCG2 rs2231142. The association of the A allele of ABCG2 rs2231142 in normoexcretors was 10 times higher than in underexcretors. The C allele of NPT1 rs1165196 was only significantly associated with gout in patients with normal uric acid excretion.

Conclusion.

Gout with uric acid underexcretion is associated with transporter gene SNP related mainly to tubular reabsorption, whereas uric acid normoexcretion is associated only with tubular secretion SNP. This finding supports the concept of distinctive mechanisms to account for hyperuricemia in patients with gout with reduced or normal uric acid excretion.
Persistence and Dose Escalation of Tumor Necrosis Factor Inhibitors in US Veterans with Rheumatoid Arthritis
Authors: Cannon Grant W. , DuVall Scott L. , Haroldsen Candace L. , Caplan Liron , Curtis Jeffrey R. , Michaud Kaleb , Mikuls Ted R. , Reimold Andreas , Collier David H. , Harrison David J. , Joseph George J. , Sauer Brian C.
Published: August 2014

Objective.

Limited evidence exists comparing the persistence, effectiveness, and costs of biologic therapies for rheumatoid arthritis in clinical practice. Comparative effectiveness studies are needed to understand real-world experience with these agents. We evaluated treatment patterns, costs, and effectiveness of tumor necrosis factor inhibitor (TNFi) agents in patients enrolled in the Veterans Affairs Rheumatoid Arthritis (VARA) registry.

Methods.

Observational data from the VARA registry and linked administrative databases were analyzed. Longitudinal data from VARA patients initiating adalimumab (ADA), etanercept (ETN), or infliximab (IFX) from 2003 (the date all agents were available within the Veteran Affairs) to 2010 were analyzed. Outcomes included Disease Activity Score using 28 joints (DAS28), treatment persistence, dose escalation, and direct costs of drugs and drug administration.

Results.

For 563 eligible patients, baseline DAS28, DAS28 improvements, and persistence on initial treatment were similar across agents. Fewer patients receiving ETN (n = 5/290; 2%) underwent dose escalation than did patients taking ADA (n = 32/204; 16%) or IFX (n = 44/69; 64%). Annual costs for first course of TNFi therapy were lower for injectable ADA ($13,100 US) and ETN ($13,500 US) than for intravenously administered IFX ($16,900 US).

Conclusion.

Despite similar persistence and clinical disease activity for these TNFi agents, rates of dose escalation were highest with ADA and IFX. Higher overall costs were noted for IFX without increases in effectiveness.
Current Smoking is Associated with Incident Ankylosing Spondylitis — The HUNT Population-based Norwegian Health Study
Authors: Videm Vibeke , Cortes Adrian , Thomas Ranjeny , Brown Matthew A.
Published: August 2014

Objective.

Smoking contributes to progression of ankylosing spondylitis (AS). Because smoking is also a risk factor for incident rheumatoid arthritis (RA) and psoriatic arthritis, our aim was to test whether smoking habits are associated with incident AS.

Methods.

Using data from the HUNT health study of the entire adult population of Nord-Trøndelag, Norway, participants in HUNT2 (1995–1997) and HUNT3 (2006–2008) were identified who reported a diagnosis of AS in HUNT3 but not in HUNT2 (n = 107). Incident AS cases were compared with AS-unaffected individuals (n = 35,278) in a case-control design. Participants with RA were excluded.

Results.

Present smoking was significantly associated with incident self-reported AS in logistic regression adjusted for potential confounders (OR 1.99, 95% CI 1.28–3.11, p = 0.002). Previous smoking (OR 1.15, 95% CI 0.66–2.02, p = 0.62) or total pack-years at HUNT2 (OR 1.01, 95% CI 0.99–1.04, p = 0.21) were not significant. The association with present smoking remained significant in various sensitivity analyses: including only cases with high probability of true AS diagnosis (OR 1.82, 95% CI 1.03–3.19, p = 0.04); including only cases with AS reported more than 3–5 years after HUNT2 (OR 2.34, 95% CI 1.09–5.03, p = 0.029), or including only participants genotyped for HLA-B27 (94 cases and 859 controls) adjusting for genotype (OR 1.79, 95% CI 1.04–2.85, p = 0.033). Hypertension was also significantly associated with incident AS (OR from 1.65 to 2.81).

Conclusion.

In the HUNT population-based study, incident AS was associated with current smoking and hypertension. If verified in further studies, this suggests that smoking should be discouraged in those at a higher AS risk, e.g., with a family history or carrying HLA-B27.
La pratique de la transdisciplinarité dans les approches écosystémiques de la santé
Authors: Bouchard Maude St-Cyr , Bouchard Catherine , Oestreicher Jordan Sky , Simon Audrey , Saint-Charles Johanne
Published: August 2014

Les approches écosystémiques de la santé (AÉS) reconnaissent l’interdépendance de la santé humaine et animale, de la santé des écosystèmes et de la société. Dans cet article, nous nous pencherons particulièrement sur la transdisciplinarité, l’un des six principes associés à ces approches. L’objectif général de cet article est d’explorer comment la transdisciplinarité est définie par des acteurs des AÉS, ainsi que d’identifier des avantages, des opportunités, des défis et des obstacles qu’elle favorise dans le cadre des AÉS. Des entrevues ont été menées auprès de chercheurs, de praticiens et d’étudiants ayant une expérience des AÉS et provenant de divers milieux : privé (ONG), universitaire et gouvernemental. Les résultats ont montré que la définition de la transdisciplinarité pour les répondants se présente sur un continuum entre le paradigme et l’outil de collaboration et que de façon paradoxale, mais non irréconciliable, la plupart des éléments discutés en tant que défis pour certains sont des avantages pour d’autres. Nous concluons sur l’absence de définition de la transdisciplinarité et de savoir-faire communs dans les AÉS ainsi que sur l’intérêt de poursuivre certaines pistes de réflexion concernant le partage d’une vision commune de la pratique transdisciplinaire au sein de ces approches, le développement d’outils facilitant sa pratique et la mise en place de processus d’évaluation des projets.
Création d’un manuel pédagogique comme action collaborative de promotion de l’écosanté en Asie du Sud-Est
Authors: Fèvre Sonia , Waltner-Toews David , Jing Fang , Kittayapong Pattamaporn , Adisasmito Wiku , Tung Dinh Xuan , Jianchu Xu , Nguyen-Viet Hung
Published: August 2014

Cet article décrit le processus de développement d’un Manuel pédagogique pour formateurs en écosanté publié en mai 2013 et adapté au contexte de l’Asie du Sud-Est. L’élaboration de ce manuel fait partie du projet Initiative pour la constitution du champ de recherche en écosanté (FBLI), initié en octobre 2011, et vise le renforcement des capacités de chercheurs, jeunes professionnels et étudiants de ce domaine. L’initiative regroupe huit institutions de cette région du monde autour du thème de l'intensification agricole et la santé. Le FBLI a soutenu la collaboration des professionnels impliqués dans l’écosanté pour qu’ils participent au développement d'outils qui allaient ensuite leur permettre d'enseigner l’écosanté dans leurs institutions respectives. Cet article décrit les processus mis en place pour favoriser la participation et la collaboration lors de l’élaboration de ce manuel pédagogique et de sa promotion. Seront ensuite déduits les aspects nécessaires au succès d’une collaboration productive dans un contexte régional et multi-institutionnel. Il conclut que trois conditions doivent être réunies pour parvenir à une collaboration co-créative : créer un environnement propice, promouvoir la confiance et le respect mutuel, et partager un intérêt ou un but commun.
De nouvelles obligations règlementaires pour l'approche écosystémique : une démarche de planification globale au service de l'aménagement des villes favorables à la santé-environnement
Authors: Nazer Shireen
Published: August 2014

Cet article présente une analyse critique de la manière d'aménager les territoires. Que ce soit en Palestine ou en France, l'approche écosystémique doit être mise en avant dans le but de créer des villes à la fois viables et vivables. Elles devraient fournir un environnement équilibré à leur population : de l'eau potable à boire, du bon air à respirer, une alimentation saine et suffisante... Ces paramètres constituent le noyau central de la santé publique. Les questions de l'agriculture et de la sécurité alimentaire, de la pauvreté et de la mortalité, des maladies chroniques et de la pollution, de la dégradation de l'environnement sont autant de thèmes interdépendants liés à la complexité de l'organisation des territoires. Elles ne peuvent être réglées sans une vision globale qui tient compte de l'homme et de son bien-être. L'approche écosystémique de la santé a posé le cadre méthodologique pour analyser les territoires rennais et palestiniens malgré leur différence convergente. Quels que soient les pays, les différences sociales, économiques ou environnementales, les villes doivent faire partie d’un système global qui dépasse les planifications conventionnelles et les limites sectorielles et frontalières.
Étude des diarrhées en milieu périurbain à Abidjan par l’approche écosanté
Authors: Koné Brama , Doumbia Mohamed , Sy Ibrahima , Dongo Kouassi , Agbo-Houenou Yveline , Houenou Pascal Valentin , Fayomi Benjamin , Bonfoh Bassirou , Tanner Marcel , Cissé Guéladio
Published: August 2014

Les maladies diarrhéiques constituent la deuxième cause de morbidité chez les enfants de moins de 5 ans en Afrique, au sud du Sahara et plus particulièrement en Côte d’Ivoire. Un projet pilote de gestion des diarrhées par l’approche écosanté a été initié en 2006 dans un village périurbain de la commune de Yopougon, à Abidjan. Après plusieurs rencontres d’échange avec les populations et un atelier de lancement participatif incluant toutes les parties prenantes, une enquête ménage transversale par questionnaire (n = 205) adressée aux femmes de ménage, une enquête géographique, l’analyse d’eau de puits, des observations et des groupes de consultations (focus group) ont été réalisés en août 2006 afin de déterminer la prévalence des maladies diarrhéiques et d’identifier les facteurs de risques majeurs.1234 personnes ont été recensées dans les 205 ménages. 7 % de ces personnes (85/1234) avaient vécu un épisode diarrhéique au cours des deux semaines précédant la date d’enquête. La tranche d’âge des moins de 5 ans était la plus affectée avec une prévalence de 14 %, suivie de celle des plus de 15 ans (6 %) et enfin des enfants de 5 à 15 ans (3 %).Les principaux facteurs de risques identifiés dans l’avènement des diarrhées sont, entre autres, le lieu de conservation de l’eau de boisson (P-value = 0,02), le récipient de conservation (p-value = 0,03) et le lieu d’installation des latrines dans les ménages (p-value = 0,02). D’autres facteurs et comportements à risques ont été également identifiés. Il s’agit des enfants qui mangent sans se laver les mains, des mouches qui pullulent et couvrent les repas consommés, des poubelles sans fermeture et couvertes de mouches, de déchets solides et points d’eaux stagnantes qui couvrent toute la surface habitée du village.Ces résultats ont permis, à travers un processus transdisciplinaire et participatif incluant les communautés et autres parties prenantes, la mise en place d’actions de renforcement de capacités des villageois pour faire face aux maladies diarrhéiques.
Adopter une approche écosystémique : accepter de changer
Authors: Tanguay Nancy , Saint-Charles Johanne , Grosbois Sylvie de
Published: August 2014

La reconnaissance et l’intégration de différentes sources de savoirs sont de plus en plus recommandées lorsqu’il s’agit d’aborder des problèmes environnementaux complexes. Pour y parvenir, de nouvelles approches favorisant l’intégration de divers savoirs se sont développées. Parmi celles-ci, les approches écosystémiques de la santé, grâce à leur caractère participatif et transdisciplinaire, impliquent la rencontre de plusieurs acteurs possédant différentes perspectives et partageant un intérêt pour une question commune. Cette approche a été adoptée dans le cadre d’un projet de recherche visant à développer des solutions culturellement pertinentes face au risque de contamination pouvant découler de la consommation de nourriture traditionnelle chez les communautés atikamekw. Elle nous a permis de porter un regard sur notre science et de procéder à une remise en question de nos méthodes afin de parvenir à un dialogue entre les différents savoirs et à une meilleure compréhension des enjeux propres aux communautés.
Eau, hygiène, assainissement et santé dans les quartiers précaires à Nouakchott (Mauritanie) : contribution à l’approche écosanté à Hay Saken
Authors: Sy Ibrahim , Keita Moussa , Traoré Doulo , Koné Brama , Bâ Khadijatou , Wedadi Ould Boilil , Fayomi Benjamin , Bonfoh Bassirou , Tanner Marcel , Cissé Guéladio
Published: August 2014

Dans les grandes villes africaines à l’instar de Nouakchott, plusieurs facteurs rendent difficiles la maîtrise de la gestion de l’assainissement urbain et l’accès à l’eau potable. Les populations s’installent sans avoir la possibilité d’accéder aux services urbains. C’est notamment le cas de nombreux quartiers spontanés et précaires très peuplés comme Hay Saken où le manque de services de base tels que l’eau et l’assainissement est une problématique très complexe liant la santé et l’environnement. Dans le cadre d’une expérience en approche écosanté menée de janvier 2010 à décembre 2011, des enquêtes (ménage et géographique) ont été réalisées pour évaluer l’impact de l’hygiène de base sur le développement des maladies diarrhéiques à Hay Saken. Dans l’ensemble, les résultats mettent en exergue l’ampleur de la vulnérabilité socio-économique, environnementale et sanitaire. Ils montrent que 59,7% des enquêtés associent leurs problèmes de santé à la dégradation de leur cadre de vie cerné par ailleurs grâce à une cartographie environnementale. La diarrhée a été déclarée chez 10,4% (23/221) des ménages et chez 13,5% (42/311) des enfants de moins de 5 ans. Les facteurs de risque associés à la survenue des diarrhées sont les intoxications alimentaires (62,5%), la qualité de l’eau de boisson (29,1%) et la mauvaise hygiène domestique (8,3%). Toutes ces causes citées semblent résulter de la carence en services de base : 94,5% des ménages recourent à l’eau vendue (charretiers, revendeurs sur place), 44,8% ne disposent pas de latrines, 88,5% des familles possédant une fosse septique font une vidange manuelle, 78,7% évacuent leurs eaux usées sur les voies publiques et 42,5% déversent leurs ordures sur des dépôts sauvages. Avec le manque de services de base, la persistance de telles pratiques risque d’accroître les problèmes environnementaux et sanitaires. (La menace du péril fécal)appelle alors à une prise de conscience collective et à un changement de comportement dans les pratiques. À la suite de l’atelier de restitution des résultats de la recherche à la population bénéficiaire, les solutions préconisées ont fait l’objet d’une stratégie de réduction des risques sanitaires liés à l’eau, l’assainissement et l’hygiène de base par la sensibilisation et l’éducation.
Digital Democracy and Trade Unionism
Authors: Tsakiris Athanasios , Eleftheriou Costas
Published: August 2014

The chapter addresses the issue of digital democracy and trade unionism, particularly unions in the field of “precarious employment” mainly in the (to a great extent) globalized tertiary sector of the economy. These unions are considered “new” due to their network modes of horizontal organizing and their use of civil disobedience mobilizing compared to those of “older” and “traditional” unions that were characterized by bureaucratic structures and conventional repertoires of action (collective bargaining and strikes). In this chapter, the authors present the cases of four such unions from the banking and telecommunications sector and from the wide fields of publishing and translating. In order to evaluate the factors that determine their uses of the Internet and the social media, the authors analyze the unions' digital strategies through a) static or dynamic and interactive usage of digital media and b) technocratic or agitating rhetoric of uploaded texts and informative material.
ICT4D and its Potential Role in the Detection, Surveillance, and Prevention of Novel Zoonotic Disease Outbreaks for Global, National, and Local Pandemic Prevention
Authors: Hai-Jew Shalin
Published: August 2014

Information and Communication Technology for Development (ICT4D) and Information Technology for Development (IT4D) has been a strategy applied since the mid-1950s to support the work of advancing developing societies. There has been a range of technologies used for information collection, knowledge management, intercommunications, and information sharing. In recent years, ICT4D has evolved to include the uses of social media platforms and various analytical tools used for extracting information from such platforms to support disease prevention efforts. It involves the use of Geographical Information Systems (GIS) to help in epidemiology. Parsimonious simulations have been brought to bear to inform the policies to support pandemic prevention in countries where pharmaceutical-based interventions may be too expensive to deploy broadly. Work done in this area suggests that appropriate non-pharmaceutical interventions exist if government leaders and the broad public can be sufficiently aware of an occurring emergence of a novel pathogen (or re-emergence of a pandemic-potential pathogen) before this pathogen becomes endemic. This chapter asks, What is the relationship between Information and Communication Technology for Development (ICT4D) and global, national, and local prevention of zoonotic diseases with pandemic potential? This work provides some early thoughts on ways ICT4D and IT4D may be deployed to this end, and it offers some insights about open-source (and some commercial) technologies that may be used for the work of pandemic prevention and protection of human health.
Loops Control Structure and Solar System Control of a Multivalent Laboratory under Real-Time Mode
Authors: Rimár Miroslav , Kuna Štefan
Published: August 2014

This paper deals with the structure of individual controlled components of the solar system, which is constituted by one of the blocks of the entire heating system of the object. In the introduction of the article, there is briefly characterized the system in a real-time mode. Such systems have to satisfy different requirements due to which they differ from conventional systems. There are several kinds of real-time systems, each of which has its own characteristics highlighted in this contribution. Subsequently, the interconnection of the control system with all blocks of a multivalent laboratory is shown schematically. Of all these blocks, a block of the solar system is described in detail, which, among other things, consists of the installed sensors that provide a control system with the necessary information so that it could then give the command to perform the desired task in response to an event in the system environment. These tasks performing is bounded by a time limit. Non compliance with a time limit would result in incorrect operation of the system, i.e. its degradation from the user's aspect.
SOx Reduction by Feedwater in an Industrial Boiler
Authors: Yeh Chun Lang
Published: August 2014

This paper discusses the SOx reduction by feedwater in an industrial boiler. The combustion and fluid flow in the boiler is examined with emphasis on the effect of feedwater on SOx reduction. The simulation results indicate that feedwater injected into the DeSOx section has little influence on the heat absorption of the cooling pipes in the flue gas cooling section. The boiler exit temperature and the exit concentrations of SOx, NOx and CO are reduced by the feedwater. When the feedwater flowrate is increased to 1000 times the original value, the boiler exit temperature and the exit concentrations of SOx, NOx and CO are reduced to 1/2, 1/13, 1/13 and 1/20 of the original values.
An Effective Implementation of the Nonlinear Homotopy Method for MOS Transistor Circuits
Authors: Niu Dan , Wang Xiao Jun , Zhou Xing Peng , He Guo Rui , Huang Zhou Rong
Published: August 2014

Recently, an efficient homotopy method termed the nonlinear homotopy method (NLH) has been proposed for finding DC operating points of MOS transistor circuits. This method is not only efficient but also globally convergent. However, the programming of sophisticated homotopy methods is often difficult for non-experts or beginners. In this paper, an effective method for implementing the MOS NLH method on SPICE is proposed. By this method, we can implement the MOS NLH method from a good initial solution with various efficient techniques and without programming.
An Altitude Estimation Technique for Autonomous Landing of a Quad-Rotor Using a Vision System
Authors: Moudpoklang Jeerasak , Sangveraphunsiri Viboon
Published: August 2014

This research work is to purpose a technique for autonomous landing of a quad-rotor by using the estimating of its altitude. The landing of the quad-rotor is in vertical direction. The detail about the design of a Landing Pad Target used for autonomous landing is explained. The autonomous landing procedure will include a mapping of the information on the detected landing pad to an altitude by using an altitude estimation algorithm with the Kalman filter. The information on the landing pad is in a form of graphic information which is easily to map to the estimated altitude of the quad-rotor used in the autonomous landing. The approximate errors from the estimation of the altitudes are within 1 cm. for 2 m. height. The control strategy is that the autonomous landing will start at an altitude of 10 meters while the landing target can be detected within this range. From the height between 10 m. to 3 m., the attached barometer is used for measurement of height and the vision system is used to estimate the height when the quad-rotor is lower than 3 m. From the experimental results, the effectiveness of the design of the landing pad, used with an appropriate control strategy, the approximate accuracy of 2 cm can be achieved. Most of the errors occur because during the last approach of landing, the height cannot be estimated from the vision but it is estimated from the measurement of the acceleration of the quad-rotor instead. Our purposed landing procedure is very promising for the autonomous landing of a quad-rotor and it can be implemented in real application.
On the Use of Composite-Steel Joint for Semi-Monocoque Frame Design
Authors: Singhanart Thanyarat , Chutisemachai Kulanun , Dilokthonsakun Kiatnathee , Sanchai Jintasarn , Siriployngam Kasemphan
Published: August 2014

The design of semi-monocoque frame by using the composite-steel joint is considered in this paper. The frame is designed with weight less than 30kg and torsional stiffness more than 1200 Nm/deg. In order to design the semi-monocoque frame, the analysis of the composite-steel joint has to be clearly investigated. Therefore, the stress analysis of composite-steel joint is performed and then the frame is designed. The double lab joint with two holes is tested and verified by the experiments. The carbon-fiber fabric laminated with the KEVLAR fabric composite laminate is used for composite part. From experiments, the joint’s strength can be increased by using the eccentric holes. Therefore, in order to meet the requirement of the SAE rules; load capacity more than 30 kN, the eccentric hole double lap joint is numerically designed and applied to semi-monocoque frame. The joint has strength of 32 kN and can be used in frame design. The semi-monocoque frame is designed and analyzed by finite element analysis. The maximum stress at maximum load is 208 MPa which is less than the yield strength of the materials so it can withstand the loads, the mass is 29.6kg, and the torsional stiffness of the frame is 1408 Nm/degree. Therefore, the semi-monocoque frame can be successfully designed.
A Weighting Slope MPPT Method Based on Sun Tracking Applied in PV System
Authors: Chen Li , Zhang Lu , Wu Hong Yan , Zhang Xing Kui
Published: August 2014

To maximize the photovoltaic (PV) cell output power, the sun tracking control is applied to keep the sunlight perpendicularly irradiated on the surface of the solar array battery firstly, and then the control strategy of weighting-slope method is proposed to track the maximum power point (MPPT) in the PV system. To verity the effectiveness of the adopted methods, both numerical simulation and experiment are carried out. The results show that the weighting-slope method significantly improved the output power of PV array comparing with perturbation and observation method.
Tracking Control for the Center-of-Gravity Constant Shift of Omnidirectional Rehabilitative Training Walker
Authors: Sun Ping , Wang Zhou Zhou , Xue Wei Lin
Published: August 2014

This paper discusses the problem of tracking control on the center-of-gravity constant shift of omnidirectional rehabilitative training walker. The solution is proposed by pre-multiplication transposition matrix on the kinetics model of the system and the property is obtained when the center-of-gravity shift is invariable. The controller of independent rehabilitee mass property was designed. The problem of rehabilitee mass constant change is solved on the basis of center-of-gravity constant shift. The asymptotic stability of the closed system was proved using Lyapunov stable theory and LaSalle principle. The simulation results confirm the feasibility and effectiveness of the designed scheme.
Field Investigation on Thermal Performance of the Tile Ventilator
Authors: Juengpimonyanon Konglit , Puangsombut Withaya , Ananacha Thana
Published: August 2014

This paper investigates the thermal performance of the tile ventilator for attic ventilation to reduce ceiling heat gain into space room. Two small houses were built using common construction materials; one common house served as reference and the other was used to test in experiments. The external ventilation pattern was considered. The inlet air openings are located at eaves and the outlet air at the tile ventilators. The results were performed that the tile ventilator is effective for reducing attic air temperature, ceiling temperature and also room temperature. Due to solar intensity during daytime, the tile ventilator could decrease heat accumulation in attic space. However, it is suitable for promoting to integrate on the roof tile.
Sheet Metals Forming Die Design Using Finite Element Analysis and the Taguchi Method
Authors: Dechjarern Surangsee , Kamonrattanapisut Maitri
Published: August 2014

Sheet metal deep-draw die is primarily constructed with draw bead, which is then modified based on trial and error to obtain a successful forming without splitting. This work aims at a robust design of forming die using numerical analysis and the Taguchi method. A three dimensional elastoplastic finite element model of a sheet metal forming process of SPCEN steel has been successfully developed using the material flow stress obtained from the modified Erichsen cup test. The model was validated with the actual forming experiment and the results agreed well. The influence of draw bead parameters on splitting and thinning distributions were examined using the Taguchi method. Four parameters, namely the friction coefficient, draw bead height, radius and shoulder radius were investigated. The Taguchi main effect analysis and ANOVA results show that the height and shoulder radius of the draw bead are the most important factor influencing the thinning distribution. Applying the Taguchi method and using the minimum thinning percentage as the design criteria, the optimum die design was identified as height, radius, shoulder radius and the friction coefficient of 4, 8, 8 mm and 0.125 respectively. The verified finite element model using the optimum die design was conducted. The predicted Taguchi response was within 5.9% from finite element analysis prediction. The improvement in the reduction of thinning percentage was 22.35%.
The Design and Implementation of the Dot Mine Hoist Signals Detection Equipment
Authors: Wu Yun , Zhou Yu Tong , Zuo Tong , Wang Xiao Dong
Published: August 2014

Known as the mine's throat, the mine hoist is the key equipment to the underground work lifting materials and personnel. But due to the negative downhole conditions, mine dot signals tend to appear wrong and be perceived inaccurately. In order to avoid the mine accident and ensure the safety of mine transportation operations, this design chooses the single chip microcomputer U101 with an high anti-jamming ability and develops a mine dot signal equipment applied in mine hoist system to test and transmit signals.
An Interactive Online Notch Fatigue Analysis Tool
Authors: Kujawski Daniel , Sree Phani C.R. , Abburi Deepak
Published: August 2014

This document presents an interactive tool for notch fatigue analysis and life prediction. Modified Neuber’s rule is used to determine notch-root elastic-plastic stress and strain. The effect of mean stress on fatigue crack initiation life is accounted by utilizing a deviatoric formulation of the Smith-Watson-Topper parameter. For variable amplitude loading a rainflow method is used and the corresponding hysteresis loops at the notch-root are determined. Then, the relevant interactive graphs and calculated values are displayed. The propose methodology is intended to be a comprehensive fatigue analysis tool used by any designer engineer in global market environment. A brief flow chart of the intended tool is presented here.
Sensitivity Analysis of Technical Parameters on Springback in Air Bending of JCO Forming
Authors: Yan Jia Xin , Yun Jian Bin , Fan Li Feng
Published: August 2014

JCO forming is one of manufacture mode widely used in production of large diameter submerged-arc welding pipes, in which JCO forming process is progressive multi-step air bending. In order to design technical parameters, it is necessary to analysis effects of technical parameters on springback in air bending of JCO forming. So, sensitivity analysis of technical parameters on springback in air bending of JCO forming is carried out using finite element method.
Taking the air bending of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the air bending is simulated by finite element (FE) code ABAQUS. In this paper, the simulation data is validated by experiments and a comparison showed a good agreement with experiments results. The sensitivity analysis of technical parameters from simulation is discussed. Thus, the results of research provides a basis to design technical parameters.
The Research on Fault Diagnosis of Diesel Engine Based on EMD
Authors: Song Bao Lin
Published: August 2014

In view of the superiority of support vector machine and the fault characteristic of diesel engine, a classify method for diesel engine fault based on support vector machine is presented in this paper. First the cylinder block vibration signal on different condition was measured by the simulation test of diesel engine fuel injection system fault, then the feature parameter was extracted by empirical mode decomposition and the most impactful parameter was selected to be the input of support vector machine. The result shows that this method has fine classified ability and precision.
Integration of Network Resources Based on Unified Identity Authentication
Authors: Fan Pei Ying , Qiu Yang
Published: August 2014

This article analysis the current situation of the virtual construction in university, which information non-sharing, poor safety and difficult management. Aiming at data diversification and the difference between platform, develop tools and system, making every network teaching resources system as an “information islet”, thus cause the disperse and independence of resources and data, integrate each resources system effectively by looking for a service governance structure. We proposed management system and method for private universities of long-term development. The main research is to set up the unified authentication system which can complete unified authentication and authority and administer. Using the virtual server technology, Information Office will set up a virtual campus portal platform with unified planning and concentration deployment, which is simple operation, advanced technology, safe and reliable, to realize unified management and guarantee the information resources interoperability and consistency.
The Analysis and Research of Northeast Route Network Optimization
Authors: Song Wei Wei , Huang Cui
Published: August 2014

The regional aviation as an important part of the modern air transportation system has a very important role in building the perfect route network, accelerating the expansion of air transportation and promoting the development of regional society and economy. Based on a full consideration of the rich tourism resources of the Northeast region, reducing costs and improving the convenience of the traveling of passengers, and improving the benefits of airlines, all these problems can be changed into direct flight routes between non-hub cities, so that a mixed integer linear programming model can be builded that it can make the lowest operating costs in the entire route network. With tabu search method and the shortest path algorithm to solve the model, so as to obtain the Northeast route layout scheme, and verify the feasibility of the scheme.
A Finite Element Method to Simulate Ice Based on Multi-Surface Failure Criterion
Authors: Wang Chuan , Ren Hui Long , Li Hui
Published: August 2014

A finite element method is introduced to simulate ice failure based on multi-surface criterion. The effects of porosity, temperature and strain rates on the ice mechanic property are taken into consideration. The main principle to simulate environment is explained. Through second developed to the finite element software, the process of ship-ice interaction is simulated. And the ship motion, ice force and ice failure mode are predicted by this method. The result is compared with other papers. the numerical simulation phenomenon is nearly same with the actual process. It suggests that simulation is reasonable, and the model has potential value in simulations of assessing ship strength. The fatigue damage is pointed out to be a special problem in ice-going ship design.
Effect of Wire Materials on Cutting Performance of WEDM for Machining of Inconel Superalloy
Authors: Garg Rajiv Kumar , Aggarwal Vivek , Singh Sehijpal
Published: August 2014

The machining of superalloys has put really a challenge for technologists and researchers. The conventional techniques of machining do not give satisfactory performance for machining of superalloys. In this paper, the results of an experimental study for cutting of Inconel 718 superalloy with wire electrical discharge machining (WEDM) have been presented. Three different wire materials along with important input process parameters namely peak current, servo voltage, pulse on time and pulse off time have been selected. The effect of these parameters on material removal rate has been investigated by using well know experimental technique called response surface methodology. The experimental results indicate that zinc-coated brass wire is most suitable for Inconel 718. An empirical model has been developed for correlating input parameters and material removal rate for zinc-coated brass wire. Analysis of variance has also been presented.
Torque Analysis and Simulation Calculation of Flying Fixed Canard
Authors: Zhang Kai Chuang , Gao Xin Bao , Le Hui Ning
Published: August 2014

Projectiles with fixed canard trajectory correction kit use Brushless DC motor (BLDC) with position sensorless to control fixed canard. Through the roll in the process of fixed canard trajectory correction kit flight direction by moment analysis and simulation, then electromagnetic torque values range is determined. Control effect of electromagnetic torque simulation, determine from the electromagnetic torque to meet the requirements in the process of correction.
The Buckling Mechanism of Square Tube Subjected to the Impact of a Mass
Authors: Tan Zhu Hua , Zhang Bo , Zhai Peng Cheng
Published: August 2014

The dynamic response of the square tube subjected to the impact of a mass was investigated by using experimental and numerical methods. The square tube was impacted by a mass at the velocity ranging from 5.09 m/s to 12.78 m/s, and different progressive buckling modes were obtained. The numerical simulation was also carried out to analyze the buckling mechanism of the square tube. The results show that there is obvious stress wave propagation and strain localization in the tube, which has a significant influence on the buckling mechanism of the tube. The stress wave and inertia of the mass play different roles at various impact velocities. And buckling mechanism at low velocity is mainly caused by stress wave, whereas the buckling mechanism at high velocity is resulted from the inertial of the mass.
Thermal Lens Microscopy: Characterization and Optimization
Authors: Liu Ming Qiang , Franko Mladen
Published: August 2014

Thermal lens microscopy (TLM) is a highly sensitive photothermal technique, and has found various applications in chemical analysis, especially when it is combined with lab-on-a-chip chemistry. In this paper, we analyze a couple of key characteristics of TLM, and give suggestions for optimization of the system for higher detection sensitivity, lower noise, lower irradiation density and/or better temporal and spatial resolutions. This will advance the development of TLM instrument for different chemical and biochemical analyses.
Failure Prediction Analysis on the 172 Basic Plane Based on Grey Theory
Authors: Li Li Qun , Zhao Hui
Published: August 2014

172 basic Cessna plane in the process of operation, the production of equipment failure is random, so the evaluation of equipment performance and to predict its failure time to improve the safe operation of the 172 basic plane has important application value. On the plane this complex system, the grey theory combined with 172 basic Cessna plane, the collection of 172 basic aircraft fault information centralized data processing, analysis, prediction model GM (1, 1), through the calculation of the GM model data, and the error precision fitting test, better realize the basic 172 aircraft equipment failure time prediction.
Modeling and Simulation of Omni-Directional Mobile Robot with Mecanum Wheel
Authors: Wu Xu Xin , Zhang Xu Long , Zhou Huai Dong , Chou Wu Sheng
Published: August 2014

In this paper, an omni-directional mobile robot with mecanum wheel was designed. Based on mathematical modeling theory and the virtual prototype software called Adams, the mathematical model of mobile robot was built and the kinetic characteristic was simulated. So we can ensure that the mobile robot with mecanum wheel has omni-directional movement characteristic. The reliability of the mathematical model has been verified through the comparision of the the mathematical calculation and simulation result. At the same time a new method was put forward to ensure all the mobile platform wheels can fully contact with the ground when running on the uneven road surface. Then the stability of the motion control system has also been improved.
Design of Control System for Knuckle Boom Crane
Authors: Song Kun , Xue Yao Feng
Published: August 2014

In this paper,the control system based on the structural characteristics of knuckle boom loader crane was designed. The control system is constituted by programmable controller, weight sensor, angle sensors, length sensor and electromagnetic unloading valves and the like. It achieves functions of torque limiting,vertical lifting and wired remote control. These functions can ensure the safe operation and improved operating efficiency. The control system has been used in large quantities of a product with favorable results.
Research on Modeling Methods of Nonlinear Black Box
Authors: Wang Kan
Published: August 2014

There have been many efficient methods for nonlinear black box. However, few articles refer to the comparison of the various methods. This paper presents a comparison of two commonly used modeling methods, aiming to provide theoretical evidence for the selection of modeling methods.
Testing Based on Empirical Likelihood for Partially Linear Models with Instrumental Variables
Authors: Zhao Pei Xin
Published: August 2014

This paper considers the model testing for partially linear models with instrumental variables. By combining the instrumental variable method and the empirical likelihood method, an instrumental variable type testing procedure is proposed. The proposed testing procedure can attenuate the effect of endogeneity of covariates. Some simulations imply that the instrumental variable based empirical likelihood testing method is more poweful.
Stability Study on Jointed Rock Mass Affected by Fissure Water Pressure
Authors: Xue Wei Qiang , Zhu Wei Shen , Fu Jin Wei , Jia Chao , Guo Shuai
Published: August 2014

Joints and fissures have a strong impact on the stability of engineering rock mass. In this paper, a self-improved analysis program of FLAC3D is adopted to study problems in fluid-solid coupling field. Then, by simulating the excavation process of a slope under the effect of fissure water pressure, the crack initiation and propagation in engineering rock mass reappears. Besides, the numerical simulation results are decent and effective, which can provide some references for engineering application.
Evaluating the Air-Entraining Concrete Performance Decay Rule under Long-Term Salts Corrosion Using MATLAB Software
Authors: Su Xiao Ping , Sun Hao Yue
Published: August 2014

In the concrete salt-soaking durability test, the dynamic elastic modulus of concrete is more sensitive to the concrete damage than the mass, and can reflect the concrete durability better. In this paper,the relative dynamic elastic modulus of concrete is used as the evaluation index of concrete durability. Its attenuation law is made the multiple linear regression by using MATLAB software. The evaluation model and its applicable conditions of the relative dynamic elastic modulus of air-entraining concrete under the action of the long-term salt immersion are obtained, which can be used to evaluate and precast the durable degree of air-entraining concrete in the salt environment.
High Temperature Properties of Asphalt Modified with Two Kinds of OMMTs
Authors: Zhang Zeng Ping , Wu Xing Jiao , Nan Xiao Fen , Jia Meng , Han Ji Cheng
Published: August 2014

In order to improve the rutting resistance of the asphalt pavement, the base asphalt needs to be modified. Two kinds of nano-organic montmorillonite (nano-OMMT) with different interlayer spacing were used as the modifier. The content of the two OMMTs in asphalt is the same, being 3wt%. The high temperature properties of the modified asphalts were compared. The effect of interlayer spacing of nano-OMMT was discussed. Results have shown that different nano-OMMT interlayer spacing leads to different high temperature properties. The asphalt modified by 3wt% of the OMMT with the interlayer spacing of 2.8nm shows better high temperature resistance that modified by the OMMT with the interlayer spacing of 3.8nm. More nano-OMMTs with other interlayer spacings should be used to explore the effect of interlayer spacings on the properties of asphalt.
Effects of Mass Ratio of Phenolic Fiber to Quartz Fiber on the Ablative Properties of Hybrid Fabric Reinforced Composites
Authors: Bian Li Ping , Xiao Jia Yu , Xing Su Li , Jiang Cai , Zheng Qing
Published: August 2014

Phenolic-quartz hybrid fabric reinforced phenolic resin composites were fabricated by compression molding and the mass ratios of phenolic fiber to quartz fiber were 1:3, 1:1 and 3:1, respectively. The ablative properties of the composite specimens were quantitatively evaluated by oxyacetylene flame test and exhaust plume ablative test with a small liquid motor (EPSLM). The effects of mass ratio of phenolic fiber to quartz fiber on the ablative properties of the composites were investigated. In the oxyacetylene flame test, the mass loss rate of the composite specimens, which can be predicted by the mixture rule, increased with rising content of phenolic fiber. However, the mixture rule was not applicable to predict the mass loss of the composite specimen in EPSLM. The mass loss of the hybrid composite specimens decreased with increasing content of phenolic fiber. As suggested by the patterns and microstructures of the char after ablation, it is useful to stabilize the char by adding phenolic fiber, and the resistance of the hybrid composite specimens to heat-flow erosion was evidently augmented when the mass ratio of phenolic fiber to quartz fiber was higher than 1:1.
Temperature Field Analysis of Circular Concrete Filled Steel Tube Reinforced Concrete Column under Fire
Authors: Dong Jian Sheng , Ren Qing Xin , Jia Lian Guang
Published: August 2014

A three-dimensional finite element analysis model was developed using ABAQUS to simulate the temperature distributions of circular concrete filled steel tube reinforced concrete column in this paper. The influence of main parameters on the temperature distribution, such as heating time, section diameter, and steel tube diameter, was analyzed. This provides valuable information about structural fire resistance and structural behaviour of concrete filled steel tube reinforced concrete column structure under fire.
The k·p Interaction Calculations of Conduction Band and Valence Band of InN Materials
Authors: Dong Shao Guang , Chen Guo Jie , Chen Xin
Published: August 2014

Thek·pinteraction of the conduction band and valence band of InN materials was calculated in this paper. The nonparabolicity of the conduction band is more pronounced, because the conduction band feels stronger perturbation from the valence bands whenEgis smaller orEPis larger. The increase in absorption edge with increasing electron concentration was calculated by the dispersion relation. In the calculation, the conduction band renormalization effects due to electron interaction and electron-ionized impurity interaction are also taken into account. A good consistent picture is established in describing the conduction band of InN based on thek·pinteraction.