bluuebunny/crossref_metadata_2025 huggingface dataset:
Advantage of Trans Radial Coronary Angiography: A Study of 40 Patients
Authors: Patwary Mohammad Saifullah , Uddin Mir Jamal , Rahman Md Mukhlesur , Haque Syed Azizul , Ahmed Md Khurshed , Haider Sazzad , Fatema Nilufar
Published: March 2010

Percutaneous coronary catheterization and revascularization are commonly performed all over the world. Among various access sites for coronary interventions, most cardiologists favour the femoral approach, while the procedure via the radial artery is only performed by a limited number of operators. In this study, we aimed to assess the procedural outcome of the trans-radial coronary angiography (CAG) among the patients in a tertiary care hospital in Bangladesh. This prospective observational study was carried out among 40 patients underwent trans-radial coronary angiography. The study was conducted for a period of one year. Indication of CAG including chronic stable angina, unstable angina, non ST elevated myocardial infarction (MI) and ST elevated MI were observed. Procedural attempt, success rate and outcome with or without complications were mentioned. Out of 40 patients, 70% were male and 30% were female (M: F=2.3:1). Among the patients undergoing trans-radial CAG, 50% had dyslipidemia and HTN, 55% had family history of IHD, 52.5% were smoker and 20% had DM. Most of the patients underwent trans-radial CAG due to unstable angina (52.5%) and this was followed by ST elevated MI (30%), non ST elevated MI (10%) and chronic stable angina (7.5%).The mean procedural time was 19.85±1.3 minutes. The fluoroscopy time was 9.60±.9 minutes. The mean hemostasis time was 9.00±7.0 minutes. All patients were ready for discharge within 24 hours. Only 7.5% patients experienced spasm of radial artery during CAG. No other complications were detected. Trans-radial approach is an attractive alternative to conventional trans-femoral approach, in suitable patients at the hand of experienced operator, with appropriate hardwire and should be ready to cross over, to the femoral approach when needed. Keywords: Trans-radial coronary angiography; trans-femoral approach. DOI: 10.3329/uhj.v5i2.4553 University Heart Journal Vol.5(2) July 2009 pp.52-55
Atherosclerosis of Coronary and Renal Artery Disease in Diabetes Mellitus
Authors: Islam Neena , Haque KMHS Sirajul , Siddique Md Abu , Subedi Bikash , Arzu Jahanara , Awal Anisul , Ahmed Md Khurshed , Fatema Nilufar , Sultan Md Ashraf Uddin
Published: March 2010

Atherosclerosis is a systemic disease. Although asymmetries in arterial involvement in atherosclerosis may occur, disease usually proceeds in parallel in various organ systems. From a clinical perspective, knowing the prevalence of renal artery involvement in patients with the evidence of atherosclerosis in other organs is important because this knowledge may be incorporated into diagnostic algorithms. This study was aimed to determine the presence of atherosclerotic renal artery disease in diabetes mellitus with coronary artery disease. A total of 173 coronary artery disease patients were purposively selected for the study .Fasting blood sugar level was estimated. Coronary angiograms were performed by standard percutaneous femoral artery cannulation (Judkins Technique).Selective right and left judkins catheter and hand dye injection were used for opacification of renal arteries. Of the 173 study subjects, 143 (diabetic 73) were male and 22 (diabetic 15) were female. Among the diabetic 15 patients had renal artery stenosis and only 7 patients had renal artery stenosis in the non diabetic group. Strength of link between significant renal artery stenosis were strongly correlated (r=0.233, and p, 0.001). Knowledge on the clinical evolution and on the cardiovascular squeal of atherosclerotic renal disease has made substantial progress in recent years. Atherosclerotic renal artery disease is present in significant proportion of diabetic patients undergoing cardiac catheterization for suspected coronary artery disease in comparisons to their non diabetic counter parts. Keywords : Atherosclerosis; Diabetes mellitis; renal artery stenosis DOI: 10.3329/uhj.v5i2.4556 University Heart Journal Vol.5(2) July 2009 pp.63-65
Subxiphoid window drainage of pericardial effusion - study of 35 cases
Authors: Hoque Rezwanul , Nuruzzaman Mostafa , Husain Sabrina Sharmin , Rahman Zerzina
Published: March 2010

Pericardial effusion defines the presence of an abnormal amount and/or character of fluid in the pericardial space. It can be acute or chronic and caused by a variety of local and systemic disorders, or it may be idiopathic. Pericardial effusion can be relieved by medical treatment, pericardiocentesis through a needle with or without echocardiographic guidance, or by surgical procedures, such as subxiphoid pericardial tube drainage, by creating a pericardial window through a left anterior thoracotomy, or by video assisted thoracoscopic surgery (VATS) Subxiphoid pericardial window drainages were done on 35 patients with symptomatic pericardial effusion in the Department of cardiac surgery, BSMMU, from February, 1995 through July, 2009, and were all included in this retrospective observational study. The inclusion criteria were an established diagnosis of pericardial effusion confirmed by history, physical findings and transthoracic echocardiography, hemodynamic alteration as evidenced by hypotension( systolic blood pressure < 90 mm of Hg), shortness of breath, echocardiographic finding of > 10 mm echo free space with/ without compression of heart, recurrence after pericardiocentesis, haemorrhagic or thick pericardial effusion and malignant pericardial effusion. The exclusion criteria were loculated or post surgical pericardial effusion, effusive constrictive pericarditis or where formal thoracotomy was applied for drainage of effusion. Patients were followed up at one month and three months following the drainage procedure. The age range was from 13 years to 70 years (Mean 47.86 ± SD 15.20 years), 19 (54.28%) were male, 16(45.72%) were female. The symptomatology varied but cardiac and respiratory decompression overwhelmed other symptoms. In this study tuberculosis is the most common cause of pericardial effusion, idiopathic and malignancies are other important causes. Subxiphoid window drainage is an effective process in relieving pericardial effusion and the reaccumulation rate is low. Key words: Subxiphoid window drainage; Surgical drainage of pericardial effusion; Pericardial effusion. DOI: 10.3329/uhj.v5i2.4558 University Heart Journal Vol.5(2) July 2009 pp.71-74
Clopidogrel Induced Haematological Dyscrasia: A Case Report
Authors: Chowdhury Abdul Wadud , Siddiq Amanullah Bin , Islam AEM Masharul , Saha Amitav
Published: March 2010

Clopidogrel is an analogue of ticlopidine, used for reduction of atherosclerotic events in patients with acute coronary syndrome (ACS), stroke, peripheral arterial disease and for elective percutaneous coronary intervention (PCI). It selectively and irreversibly blocks ADP binding to platelets. Its primary side effect is bleeding. However potentially fatal types of haematological dyscrasia such as aplastic anaemia, neutropenia, thrombocytopenia, pancytopenia may be associated with clopidogrel therapy. A 50 years old diabetic, hypertensive lady with angina was started to treat with clopidogrel along with other anti-ischaemic and anti-hypertensive drugs. Subsequently the patient developed leucopenia and thrombocytopenia after starting of clopidogrel. Five days later her complete blood count returned to normal after withdrawal of both anti platelets. Aspirin was re-introduced with great precaution. Later repeat leucocyte and platelet count were found to be normal. At follow- up 1 month after discharge patient found asymptomatic with normal blood count. To the best of our knowledge, clopidogrel induced haematological dyscrasia was not reported earlier in our country. Key words: Acute coronary syndrome; percutaneous coronary intervention. DOI: 10.3329/uhj.v5i2.4563 University Heart Journal Vol.5(2) July 2009 pp.89-90
Combined Effects of Pipe Diameter, Reynolds Number and Wall Heat Flux and on Flow, Heat Transfer and Second-Law Characteristics of Laminar-Transitional Micro-Pipe Flows
Authors: Ozalp A. Alper
Published: March 2010

Fluid flow, heat transfer and entropy generation characteristics of micro-pipes are investigated computationally by considering the simultaneous effects of pipe diameter, wall heat flux and Reynolds number in detail. Variable fluid property continuity, Navier-Stokes and energy equations are numerically handled for wide ranges of pipe diameter (d = 0.50–1.00 mm), wall heat flux (q''= 1000–2000 W/m2) and Reynolds number (Re = 1 – 2000), where the relative roughness is kept constant at e/d = 0.001 in the complete set of the scenarios considered. Computations indicated slight shifts in velocity profiles from the laminar character at Re = 500 with the corresponding shape factor (H) and intermittency values (γ) of H = 3.293→3.275 and γ = 0.041→0.051 (d = 1.00→0.50 mm). Moreover, the onset of transition was determined to move down to Retra = 1,656, 1,607, 1,491, 1,341 and 1,272 at d = 1.00, 0.90, 0.75, 0.60 and 0.50 mm, respectively. The impacts of pipe diameter on friction mechanism and heat transfer rates are evaluated to become more significant at high Reynolds numbers, resulting in the rise of energy loss data at the identical conditions as well. In cases with low pipe diameter and high Reynolds number, wall heat flux is determined to promote the magnitude of local thermal entropy generation rates. Local Bejan numbers are inspected to rise with wall heat flux at high Reynolds numbers, indicating that the elevating role of wall heat flux on local thermal entropy generation is dominant to the suppressing function of Reynolds number on local thermal entropy generation. Cross-sectional total entropy generation is computed to be most influenced by pipe diameter at high wall heat flux and low Reynolds numbers.
Identification of Major Phenolic Compounds from Nephelium lappaceum L. and Their Antioxidant Activities
Authors: Thitilertdecha Nont , Teerawutgulrag Aphiwat , Kilburn Jeremy D. , Rakariyatham Nuansri
Published: March 2010

Nephelium lappaceum is a tropical fruit whose peel possesses antioxidant properties. Experiments on the isolation and identification of the active constituents were conducted, and on their antioxidant activity using a lipid peroxidation inhibition assay. The methanolic extract of N. lappaceum peels exhibited strong antioxidant properties. Sephadex LH-20 chromatography was utilized in the isolation of each constituent and the antioxidant properties of each was studied. The isolated compounds were identified as ellagic acid (EA) (1), corilagin (2) and geraniin (3). These compounds accounted for 69.3% of methanolic extract, with geraniin (56.8%) as the major component, and exhibited much greater antioxidant activities than BHT in both lipid peroxidation (77-186 fold) and DPPH• (42-87 fold) assays. The results suggest that the isolated ellagitannins, as the principal components of rambutan peels, could be further utilized as both a medicine and in the food industry.
Thermal [4 + 2] Cycloadditions of 3-Acetyl-, 3-Carbamoyl-, and 3-Ethoxycarbonyl-Coumarins with 2,3-Dimethyl-1,3-butadiene under Solventless Conditions: A Structural Study
Authors: Flores-Larios Irma Y. , López-Garrido Lizbeth , Martínez-Martínez Francisco J. , González Jorge , García-Báez Efrén V. , Cruz Alejandro , Padilla-Martínez Itzia I.
Published: March 2010

The thermal [4+2] cycloadditions of 3-acetyl-, 3-carbamoyl, and 3-ethoxycarbonylcoumarins with 2,3-dimethyl-1,3-butadiene under solvent free conditions are reported, as well as the epoxidation reactions of some adducts. Discussion is focused on the structural features of the Diels-Alder adducts and their epoxides, based upon NMR, X-ray, and mass spectral data, and supported by ab initio theoretical calculations.
An Analysis of the Spatial Colonization of Scrubland Intrusive Species in the Itabo and Guanabo Watershed, Cuba
Authors: Ruiz Sinoga Jose Damian , Noa Ricardo Remond , Perez Danai Fernandez
Published: March 2010

During the last twenty years, numerous agricultural and farming areas of Cuba have seen a marked increase in invading plants; among the most common species found is the Marabú (Dychrostachys cinerea) and the Aroma (Acacia farnesiana). In the present study, an analysis was carried out of the expansion of these species over the last two decades, in the river basin of the Guanabo (17 km north-east of Havana). This was done by digital processing of satellite images and an analysis of the spatial and statistical data of the Geographical Information System (GIS). The zones most affected by this scrubland were mapped and a study of how natural factors may have influenced land use and the tendency of these species to increase was carried out.
Advanced in silico Approaches in Antiviral Research
Authors: Zonta Nicola , Coluccia Antonio , Brancale Andrea
Published: March 2010

Computer-aided drug design has seen constantly increasing application over the past two decades in every area of drug discovery. It can offer significant advantages over conventional approaches, being far less expensive and faster than conventional methods, or offering the possibility to predict molecular behaviours that cannot be elucidated in any other way. Recent developments in software and hardware make it possible to simulate increasingly complex molecular environments, widening the applicability of in silico studies from the interactions of small molecules with key protein residues, to the simulation of the dynamic evolution of complex biological systems with atomic resolution. Antiviral research offers several open challenges, from a biological, biochemical and pharmaceutical point of view. Computational approaches are already providing some answers and will undoubtedly give more in the near future. Here, we present a brief overview of the cutting-edge computational methods that play a major role in present and future antiviral research.
Antimicrobial resistance in pathogens causing nosocomial infections in surgery and intensive care units of two hospitals in Antananarivo, Madagascar
Authors: Randrianirina Frédérique , Vaillant Laetitia , Ramarokoto Charles Emile , Rakotoarijaona Armand , Andriamanarivo Mamy Lalatiana , Razafimahandry Henri Claude , Randrianomenjanahary Jules , Raveloson Jean Roger , Hariniana Elisoa Ratsima , Carod Jean-François , Talarmin Antoine , Richard Vincent
Published: March 2010

Background: In developing countries, knowledge of antimicrobial resistance patterns is essential to define empirical therapy. Methodology: All the surgery and intensive care wards of two hospitals in Antananarivo were included to study the antimicrobial susceptibility of the pathogenic bacteria causing nosocomial infections. A repeated cross-sectional survey was conducted between September 2006 and March 2008, one day per week. Isolates were identified using classical methods, and resistance to antibiotics was assessed according to the recommendations of the Antibiogram Committee of the French Microbiology Society. Results: Clinical specimens from 706 from 651 patients were collected. Of the 533 bacterial pathogens, 46.7% were Enterobacteriaceae, 19.3% were Staphylococcus aureus, and 19.1% were pathogens from the hospital environment (Pseudomonas aeruginosa and Acinetobacter baumannii).Frequencies of resistance were high, particularly in Enterobacteriaceae; however, the rate of Staphylococcus aureus isolates resistant to oxacillin (13.6 %) was moderate and all these isolates were susceptible to glycopeptids. The percentages of isolates susceptible to ceftazidim were 81.8% for E. coli, 60.9% for Klebsiella, and 52.5% for Enterobacter spp. Resistance to third-generation cephalosporins was due to extended spectrum betalactamases (ESBL). Multivariate analysis showed that diabetes (adjusted OR: 3.9) and use of an invasive procedures (adjusted OR: 3.5) were independent risk factors for resistance to third-generation cephalosporins. Conclusion: A nationwide surveillance programme is needed to monitor the microbial trends and antimicrobial resistance in Madagascar.
Salmonella Enteritidis in chicken carcasses and giblets in Southern Chile
Authors: Ulloa Jorge , Gonzalez Mario , Hernandez Carlos , Villanueva Maria Paz , Fernandez Heriberto
Published: March 2010

Background: Gastroenteritis caused by Salmonella spp. is mainly related to the consumption of undercooked chicken meat or raw poultry products. The objective of this study was to assess the occurrence of Salmonella spp. in chicken carcasses and giblets commercialized in Southern Chile (Valdivia city). Methodology: A total of 560 samples were collected from four supermarkets and one poultry products dealer, during two periods (autumn-winter and spring-summer periods), and analysed for Salmonella using standard bacteriological procedures. Results: Five out of 280 analyzed carcasses (1.8%) and one out of 280 (0.4%) chicken giblets were Salmonella positive. The isolation frequency of Salmonella spp. considering the total samples analyzed was 1.1%. Salmonella Enteritidis was the only serotype isolated. No significant differences (P > 0.05) in the isolation rates between the autumn-winter and spring-summer periods were found. Conclusion: Salmonella Enteritidis was isolated in low frequency from chicken carcasses and giblets commercialized in Southern Chile (Valdivia city); however, in spite of the low frequency of contaminated samples, this kind of food could be a potential vehicle of Salmonella infection to humans.
Circuito cerrado para una industria sostenible, aportaciones del sector cementero
Authors: Zaragoza A.
Published: March 2010

La búsqueda del desarrollo sostenible para la industria sólo puede entenderse desde un enfoque global que abarque tanto la actividad industrial como el producto. La actividad industrial necesita incorporar al proceso productivo soluciones que minimicen su impacto reduciendo el consumo de recursos y las emisiones a la atmósfera. El producto debe incorporar características sostenibles tales como la posibilidad de ser reciclado y/o valorizado en algún momento de su ciclo de vida y, así, poder ser reintroducido de nuevo en la actividad industrial.
De esta manera, el producto se convierte en la piedra angular de un sistema de producción en “circuito cerrado” que implique a todos los sectores industriales en el concepto de reciclaje de productos y residuos y que minimice la huella del proceso. El sector cementero debe seguir incidiendo en las posibilidades de reciclado de los materiales fabricados con cemento, además de los utilizados propiamente en su fabricación, y, sobre todo, se debe seguir profundizando en la relación entre Ciclo de Vida y reciclaje, lo que proporcionará al sector una metodología y unas herramientas útiles para reducir el impacto ambiental y reforzar sus contribuciones sociales y económicas.
Por ello el sector está haciendo esfuerzos para la puesta en marcha de una industria en circuito cerrado en la que se reutilicen materiales y energía, minimizando al máximo su afección en el entorno, a la vez que se está trabajando en una conceptualización de este modelo de producción en cadena, que implique a todos los sectores industriales en el reciclado de materiales. Prueba de este compromiso son los acuerdos firmados con FER y Sigrauto para el aprovechamiento de vehículos fuera de uso y con UNESID para la valorización de residuos siderúrgicos, así como el proyecto Pressure para la gestión integral de residuos industriales.
Metodología y herramienta VERDE para la evaluación de la sostenibilidad en edificios
Authors: Macías M. , García Navarro J.
Published: March 2010

La edificación sostenible ha crecido a partir del movimiento hacia la edificación verde y bajo el movimiento más amplio de desarrollo sostenible. El movimiento verde se desarrolla en los años 70 con especial énfasis en la conservación de la energía y la eficiencia energética. En los 80 crece la preocupación acerca del impacto que produce la operación del edificio y la fabricación de los materiales de construcción sobre el medioambiente natural. Durante esta misma década los problemas de la pobre calidad del aire interior y la inadecuada ventilación en edificios herméticos (síndrome del edificio enfermo) constituyen una preocupación creciente en los ciudadanos. Gradualmente ha habido un incremento en el consenso en relación con el tipo impactos que deben incluirse en un modelo de evaluación verde.
Desde el año 2000, el número de métodos para la evaluación medioambiental de edificios en el mundo se ha multiplicado considerablemente. BREEAM (BRE Environmental Assessment Method) fue el primer sistema (aparecido en 1990) que ofreció un método de etiquetado de edificios aunque LEED (Leadership in Energy and Environmental Design) es el de mayor implantación en el mercado de grandes edificios. Actualmente existe un gran número de modelos, muchos de ellos basados en la metodología desarrollada por el grupo GBC (Green Building Challenge), actualmente iiSBE (International Initiative for a Sustainable Built Environment). En este trabajo se presenta una nueva metodología y un modelo de evaluación de la sostenibilidad de edificios denominado VERDE, basado en la cuantificación de la reducción de impactos.
Cuantificación de los recursos materiales consumidos en la ejecución de la cimentación
Authors: Mercader M. P. , Marrero M. , Solís J. , Montes M. V. , Ramírez A.
Published: March 2010

La industria de la construcción produce un significativo impacto medioambiental debido a que consume cerca del 40% de los recursos naturales y genera en torno al 40% de los residuos. Debe ser función del técnico responsable, entre otros, a través de los procesos de diseño, obtención y suministro de materiales, construcción, uso y demolición final, contribuir a un entorno más sostenible. Es por ello de gran interés identificar y cuantificar los factores que condicionan el impacto ambiental, ya que el único modo en el que se puede hablar de mejoras es a través de la obtención de datos que se puedan medir y contrastar con facilidad. En el presente trabajo se evaluarán estos factores desde la perspectiva de los recursos materiales consumidos durante la fase de construcción de la edificación. Dicha tarea no es sencilla dada la intervención de procesos y agentes muy heterogéneos, desde la extracción y fabricación de materiales hasta la deconstrucción o reciclado.
Por último, se presenta un ejemplo práctico en el que se identifican y cuantifican los recursos consumidos en la ejecución de una cimentación. Los resultados de este estudio de campo son ciertamente preocupantes ya que el 100% de los recursos consumidos constituyen barreras a la sostenibilidad, bien por no ser renovables (90% de los recursos consumidos) o por la toxicidad que produce su fabricación o puesta en obra para las personas (10% restante).
Cálculo de emisiones de gases de efecto invernadero en edificios: análisis del funcionamiento de varias herramientas en diferentes climas
Authors: La Roche P.
Published: March 2010

El primer paso para reducir las emisiones de gases invernadero generadas por las edificaciones es el poder calcularlas adecuadamente. Si esta actividad se integra al proceso de diseño arquitectónico; entonces el impacto de las estrategias de diseño se puede evaluar más fácilmente; resultando un edificio con menores emisiones. Cincuenta herramientas de cálculo de emisiones y programas de modelaje se compararon en las áreas en las cuales los edificios son responsables de las emisiones de gases invernadero: operación; agua; construcción; basura; y transporte desde y hasta el edificio. Las herramientas comparadas debían ser fáciles de utilizar; pero con suficiente precisión para proveer información de utilidad al diseñador. El efecto en las emisiones; al modificar el aislante de las paredes y cubierta; cambiar la calidad de los vidrios; la eficiencia del sistema de calefacción y enfriamiento; y la integración de sistemas pasivos de ganancia solar directa o de enfriamiento pasivo por ventilación nocturna fueron evaluados con dos programas de modelaje energético: HEED y Design Builder. Los resultados de este análisis demuestran que la implementación apropiada de estrategias de diseño reducen significativamente las emisiones por operación en todos los climas. Al final del artículo se propone un protocolo que combina varias herramientas sencillas para calcular las emisiones de las diferentes fuentes.
Propuesta de una nueva metodología para la ubicación de infraestructuras viarias ambientalmente sostenibles. Aplicación en el tramo viario de la pedemontana Fabriano-Muccia
Authors: Neri M. , Menconi M. E. , Vizzari M. , Mennella Vincenzo G. G.
Published: March 2010

El trabajo contempla la creación de un modelo para definir la mejor localización en el territorio de nuevos proyectos de infraestructuras viarias y su convalidación en una carretera que forma parte de un proyecto de gran envergadura denominado Cuadrilátero Marcas-Umbría, en vías de realización. El objetivo del trabajo consiste en la puesta a punto de una herramienta ágil y versátil, capaz de sopesar, interpretándolos de forma correlacionada, los distintos aspectos de carácter medioambiental, socioeconómico, técnico y operativo, ligados a la construcción de una obra viaria. Se ha prestado especial atención a las dinámicas de uso y consumo de los hábitats naturales y a las problemáticas vinculadas a los fenómenos de fragmentación ecológica provocados por la red viaria y los asentamientos. La metodología que se ha puesto a punto prevé la recogida y la implementación, dentro de un sistema de información territorial dedicado, de un amplio abanico de datos capaces de definir las características peculiares del ámbito que es objeto del estudio, posteriormente interpretados y reconducidos a síntesis mediante la aplicación de una serie de indicadores específicos. Los indicadores definidos se incorporan posteriormente mediante la aplicación de técnicas de análisis multicriterio para definir un índice de evaluación sintético capaz de estimar de forma correlacionada la sensibilidad del territorio ante la introducción de nuevas infraestructuras viarias. Para convalidar la metodología, los índices propuestos se han aplicado a un área de estudio donde se está construyendo una infraestructura viaria de importancia considerable para las conexiones transversales de Italia central.
Improvement of the Iterative Algorithm for Numerical Simulation of Springback in Sheet Metal Forming
Authors: Han Jun , Shi Fa Zhong , Shao Li Kang
Published: March 2010

Springback is an inevitable process of sheet metal forming phenomenon. Numerical simulation is an effective way to solve the springback problem, and more and more attention to industry and academia. This paper describes the implicit springback analysis of the BFGS equilibrium iteration method, and proposes a strategy for optimizing the calculation, reducing the computation and avoiding the potential problem of instability in the calculation. At last, the use of self-developed software gives numerical examples.
Extraction Profile Feature Points of Complex Parts Based on Genetic Algorithms
Authors: Lv Qiu Juan , Fang Su Ping , Wang You Jun , Zhang Zhen
Published: March 2010

The structures of mechanical parts are becoming more and more complex with the continuous expansion of the design industry. In this article, the profile points are reduced first according to the angle and distance threshold. Based on the minimal integral square error (ISE), Genetic algorithms (GAs) are then used with line segments and circular segments as the primitive form cell so that the profile feature points can be identified and extracted for the complex parts. It is shown that the genetic algorithms are successful for complex parts, although for a large amount of points, computation time is longer, and this will be considered in our further work.
Analysis of the Workpiece Elastic Deformation Holding in Fixture with High Definition Metrology
Authors: Jiang Zhao Liang , Meng Xiang Xu
Published: March 2010

The work-piece holding in the fixture will have elastic deformation under the effect of clamping force and the positioning of locators which will lead to poor quality. In this paper, after comparing the advantage of High Definition Metrology (HDM) with the traditional contact measurement metrology, the surface flatness measurement experiment scheme was designed based on HDM. Then, it was optimized with Design of Experiment (DOE). Finally, the work-piece elastic deformation caused by clamping force, its location and support location were analyzed using the case of Aluminum alloy 6061 part.
Rapid Design Technology for Building Door & Window Products Based on Generalized Modularization
Authors: Yan Chun Ping , Zhou Qing Hua , Mu Cheng Ke , Liu Fei
Published: March 2010

In allusion to the rapid design for building door and window products, a rapid design method based on generalized modularization was put forward. According to the combination of generalized modules, the product configuration model was automatically generated on the basis of generalized modular planning, and then the rapid design for building door and window products was realized by the instantiation of product configuration model. With the method, product designs and associated knowledge can be reused and the design cycle can be effectively shortened. A designing system for building door and window products was developed and applied in some enterprises, with satisfactory results.
Web-Based Collaborative Design of Auto Steering Hydraulic Rotating Valve
Authors: Zhao Lian Sheng , Rui Yan Nian , Chen Qi Dong , Zhang Chun Yan
Published: March 2010

The design quality of auto steering hydraulic rotating valve directly affects driving security, operating stability and ride comfort. Active server page (ASP) technology is applied in the study of working principal of auto steering hydraulic valve, calculation method of web-based design and parameterization design for parts. An collaborative design platform in network environment is built. The collaborative design of auto hydraulic Steering valve based on network is realized through some key technologies of safety technology in network design, database technology, graphical viewing technology, and COM technology.
Ergonomics Optimization of Human-Product Contact Surface Design Based on Stochastic Finite Element
Authors: Wu Jian Feng , Wang Hai Ning , He Xiao Dong , Wang Fu , Liu Xiao Jian
Published: March 2010

An ergonomics optimization method of human-product contact surface design based on stochastic finite element was described. The shape of the contact surface between user and the product is the most complex content in product morphology design. Thinking of the individual needs of users, the stochastic finite element method was used to simulate the shape of product surface to meet the randomness of design variables, and the genetic algorithm was used to search the optimal surface solutions. And then a case of the seat back surface design of a driver chair was studied. The optimization results showed that the maximum pressure of the surface was decreased and the structure's reliability were guaranteed. The effectiveness of this ergonomics optimization method was verified.
Data Collection and Model Construction Methods for Reverse Engineering
Authors: Jiang Ling Yun , Wang Zhi Biao
Published: March 2010

The process of creating a CAD model from an object is mainly made up of two steps: the data collection through digital measurement and the construction of parameterized and revisable model. This paper discusses the measuring process and technical problems of the Coordinate Measuring Machine (CMM) and non-contact sensor. Through comparative analysis, we determine the application scope of those approaches in measuring different dimensions of the same objects considering the time efficiency and tolerance requirement. This paper divide the objects into two categories: freeform feature objects and regular feature objects. As for the freeform feature objects, people could fit wrap-around B-spline surfaces to construct the model. Regular feature objects for mass produce contain machined surfaces which should be precisely measured and modeled. The model of regular feature object should be constructed by three-dimensional modeling software, so that it is parametric and revisable for changing and improving the original design. Sizes and position of important surfaces of the model are acquired from CMM, and those of non-important features are fitted though point cloud processing. Some profile can’t be measured directly from CMM but should be precise, so this paper proposed two methods to construct profile line and analyze error by comparing it with point cloud.
Structural Reliability Analysis of Loading Platform Cantilever under Multiple Failure Modes
Authors: Zhang Rui Jun , Li Min , Zhang Min Qin , Wang Xiao Wei
Published: March 2010

Force behaviors of the loading platform of rotating stereo garages is analyzed, equations describing the load capacity and the deformation limit state are proposed for the key sections by applying the second-order moment into the reliability analysis of the main beam. Considering random parameters subject to normal distribution, a reliability model of the main beam of the loading platform is set up based on multiple failure modes and the reliability is analyzed and calculated by using second-order moment. Simulation results show that the reliability model is significant to guide designing on the reliability of rotating stereo garages and improves rotating stereo garages.
Study on Product Design and Process Simulation of Hydroformed Automobile Framework
Authors: Zhou Lin , Cheng Xiao Min
Published: March 2010

To achieve smaller weight, stronger strength and higher stiffness, tube hydroforming is widely used in the industry. The front beam is analysed the front beam part is redesigned based on the technics, and automotive structural lightweight and integration are achieved under the precondition of ensuring vehicle performance and security. Then, the hydroforming process of front beam is analyzed by numerical simulation based upon the elastic-plastic finite element method, Belytschko-Tsay shell element theory and dynamic explicit solution, the internal pressure loading path as the main hydroforming process parameters is discussed in detail. The present analysis provide basis for its applications.
Analysis on the Stress and Failures of Disc Cutter of Full Face Rock Tunnel Boring Machine
Authors: Wang Teng Yue , Zhang Ke , Sun Hong , Wu Yu Hou , Zhao Kai Jun
Published: March 2010

Full face rock tunnel boring machine (TBM) plays an important role in boring rock of tunnel. The failure of disc cutter is the main reason leading to low efficiency of TBM. In this paper, analysis of force and motion for disc cutter are carried by using ABAQUS to study stress distribution and concentration in disc cutter and rocks. Influence of different rocks on stress in disc cutter is analyzed. By combination the failure modes of disc cutter and its stress distribution, methods of decreasing failures of disc cutter are presented. Wear resistance and service life of disc cutter are improved by matching the materials of disc cutters with rocks. The results are useful for structural optimization and strengthening treatment of material of disc cutter.
Study on the Optimization Straightening Regulation of Heavy Rail Compound Roll Straightening
Authors: Song Hua , Wang Pei Long , Fu Li Hua , Chen Ming , Wang Z.Q.
Published: March 2010

This paper adopted explicit dynamics FEM software ANSYS/LS-DYNA and carried out the numerical simulation calculation of 9 roller horizontal straightening and 8 roller vertical straightening for 60 kg/m heavy rail with original curvature. The reductions of straightening rollers are taken as the main effective factor to the residual stress in the straightening regulation. It adopted orthogonal experimental method to obtain the main effective factors for straightness and residual stress. In the assurance of meeting the straightness, it obtained the regulation in which the residual stress is the smallest, so it makes the important theoretical and actual sense to formulate the rational straightening process and improve the straightening quality of rail.
New Characteristics of Inverse Analysis Method and its Application in Sheet Metal Formability Prediction
Authors: Lu Xiao Yang , Tang Bing Tao , Lu Xiao Li
Published: March 2010

Information of initial flat blank and final workpiece is prerequisite and satisfactory blank configuration and thickness distribution can be obtained, which is very important at the preliminary design stage. The theory and improvements of inverse analysis method of sheet metal forming based on deformation theory of plasticity is explored. In order to take into account the bending effects, this approach with CST membrane element and DKT6 plate bending element superposed to obtain the DKT12 shell element is fully introduced. An ideal reverse deformation method is implemented to improve the initial solution obtained by radical length development method. Application to a square box deep drawing case is presented with emphasis on the efficiency and usefulness of the proposed improved methods.
Rapid Design Platform for Mechanical Products Based on CBR
Authors: Wu Shu Fang , Wang Zong Yan , Pang Long Liang
Published: March 2010

Three-dimensional rapid design for mechanical products is of great importance in machinery industry. In order to enhance market competitiveness, rapid design method of case-based reasoning has been imported. This paper discusses the meaning and system of rapid design, provides a case library built up based on parametric design and knowledge base, and probes the transformation technology from three-dimensional parameterized model to two-dimensional engineering drawing with optimized view position, view scale, and drawing note position in terms of geometry, dimension and engineering restriction. The final drawing accorded with the enterprise production demand. It can greatly shorten design cycle for mechanical products, and provides a new approach for the enterprise to quickly respond to market demands.
The Auxiliary Angle Method for Deriving the Pressure-Angle Expressions of Cam Mechanisms
Authors: Chang Yong , Li Yan Ping
Published: March 2010

Starting from the planar and spatial mesh fundamental theorem, this paper puts forward a new, general and effective method for deriving the pressure-angle expressions of cam mechanisms—“Auxiliary Angle Method”. It successively overcomes the shortcomings and defects of traditional Velocity Instantaneous-pole Method’s, and is very suitable for all planar and spatial cam mechanisms. New method lay the foundations for the solution of cam mechanisms’ fundamental size tasks.
Bubble Journey: Multimodal Input Tools Design to Augment Sense Experience in Computer Game
Authors: Ying Fang Tian , Zhu Peng Cheng , Ye Mi Lan , Chen Jing Chang , He Zhao , Pan Yue
Published: March 2010

In this paper, we discuss a novel approach to multimodal input design in Tangible User Interface (TUI). We present a prototype Bubble Journey, a game platform where users control the avatar in flash game by blowing a real handle. This computer game was combined multimodal input tool embedded sensor, which augment experience of user’s (children’s) five senses and body into game’s digital world with previous experience in daily life. Sensor embodied in multimodal input tool can convert data of sounds and movements produced by users (children) into digital signals to manipulate the virtual characters’ performance in the game.
Dynamic Analysis of CNC Gantry Surface Grinder by Finite Element Method
Authors: Weng Ze Yu , Hu Shao Heng , Zhang Nan Nan , Ding Hong Gang , You Hong Wu
Published: March 2010

The dynamic characteristics of the grinding machines have an impact on its machining quality and cutting efficiency. In this paper, through the analysis of the structural features of the Large CNC gantry surface grinding machine, the finite element model of structure of the grinder was established on the base of the simplified machine structure, on which carried out its dynamics analysis, obtaining the modal parameters of the orders under different mode shapes. The effect on the dynamic characteristics of machine tools was analyzed under different mode shapes, then the weak link of the surface grinding machine was given, and then how to improve the structural design weakness of surface grinding machine was discussed, all of which provided theoretical basis for improvemental design for the structure of the large CNC gantry surface grinding machine.
NURBS Curves Interpolation Based on Dynamic Characteristics of Machine Tools
Authors: Dong Jin Hua , Cao Hui Qin
Published: March 2010

This paper presents an interpolation algorithm for non-uniform rational B-spline (NURBS) curves. A real-time look-ahead function is introduced to deal with the abrupt change of feedrate. In the proposed algorithm, feedrate can be adaptively adjusted according to the radius of curvature of curves. Dynamic characteristic of machine tools is considered while the feedrate is adjusted. The experimental results show that this algorithm significantly reduced the machining error brought about by the instantaneous acceleration fluctuations of machine tools.
Research on Static Characteristics of Static Pressure Supporting Cylinder Pair
Authors: Xu Wen Qin , Sun Yin Da , Zhou Bai Qing
Published: March 2010

A new radial plunger pump is given which is installed with roller between plunger and stator, the roller is purely rolling on the inner face of stator, reducing the friction force and effectively avoiding the combustion of friction pair in working orde. Its static characteristics are studied and some theoretical evidences are provided for developing new radial-plunger pumps, and it has the advangtages of high speed, high efficiency, and long lifetime. The present analysis can provide the basis for its applications.
Numerical Simulation and Experimental Research on MAG Surfacing Deposited with Electro-Magnetic Stirring Controlling
Authors: Zhao Guo Ji , Luo Qian , Wang Xiang Jie , Luo Jian
Published: March 2010

Numerical simulation and deposited experiment of MAG welding are carried out on the conditions of Electro-Magnetic Stirring (EMS) in this paper. Based on the research of EMS welding arc action, a simple EMS-MAG welding Gaussian distribution model using whole heat flux density is established, which MAG welding arc and droplet transfer are regarded as one integrated system. The important additional magnetic field parameter in EMS-MAG surfacing deposited welding is considered in this model. The computer-aided arc measurement system is used to analyze the effects of additional magnetic field in MAG welding. Effects of excitation current on welding penetration and width are analyzed by deposited experiments. Many deposited experiments are used to adjust model parameters and verify the simulation results. By defining key parameter and optimizing the model on the basis of experimental data, it can improve the simulation accuracy effectively. The results show that the established Gaussian distribution model can be used to simulate EMS-MAG welding process.
A Study on the Application Scheme for RFID-Tech Based Process Management in the Sewing Workshop of Clothing Companies
Authors: Zhou Dong Jun , Wang Zheng Xiao
Published: March 2010

As the rapid development of Internet and communication technology, clothing industry in China keep updating itself and speeding up its informationization of its production process. However, since clothing industry in China is developed from handicraft industry, it has such problems as the complexity of working procedure, disparity of the manufacturing goods, and the difficulty of management. Business characteristics of the process management in the workshops of the clothing company is discussed. An application scheme for carrying out RFID in a clothing company is proposed and lastly, the future of the application and development of RFID-tech in clothing company in China is predicted.
A New Optimal Control of a Tandem Cold Metal Rolling Process
Authors: Nan Yu Rong , Li Yong Feng
Published: March 2010

In tandem cold mill, a strip is flattened by stands of rolls to a desired thickness. In the process, there exists thickness disturbance and hardness disturbance, which will affect the export thickness of the strip. In order to solve these problems, control system adopt a new control strategy wherein a state-dependent Riccati equation is utilized. In the third part of this paper, the new technique which uses the state-dependent Riccati equation method for controlling the tandem cold rolling is tested by simulations. The results of these simulations are included in the evaluations which show successful control during the passage of the weld.
Machinability Comparison of Electrical Discharge Machining of YG15 Hard Metals, 45 Carbon Steel and ZL108 Cast Aluminum Alloy
Authors: Wang Yan , Gao Feng
Published: March 2010

A theoretical model of temperature for electrical discharge machining (EDM) is established. Based on finite element method, the distribution temperature fields of ZL108, YG15 and 45 carbon steel during EDM process are simulated with the aid of ANSYS software. The simulation model provides good effects on the surface quality forecast, parameter regulation and optimization in the process of EDM. Under same experimental conditions, the machining efficiencies of EDM ZL108, YG15 and 45 carbon steel are listed. The machining efficiency of EDM ZL108 or 45 carbon steel is much higher than YG15. The observations of YG15, ZL108 and 45 carbon steel surface micro-patterns after EDM are made by VHX-600 3D digital microscope. Form the experimental results, we can explain why ZL108 and 45 carbon steel are tractable metals, while YG15 is difficult-to-cut metal.
The Flexible Iterative Algorithm for Calculations of Static Form Errors in Peripheral Milling Thin-Walled Components
Authors: Kang Yong Gang , Wang Zhong Qi
Published: March 2010

This paper proposes a new efficient iterative algorithm which named flexible iterative algorithm (FIAL) with a general approach suitable for surface form errors prediction in peripheral milling of thin-walled workpiece. First, a FEA-Based model is presented to analyze the surface dimensional errors in peripheral milling of thin-walled workpieces. Then the FIAL is discussed in detail for the procedure of deformation prediction. From FIAL, an iterative scheme for the calculations of tool/workpiece deflections considering the former convergence cutting position are developed，in the scheme a small variable must be included in the calculation of radial cutting depth which never been considered in the literatures before.The proposed approach is validated and proved to be efficient through comparing the obtained numerical results with the test results.
Influence of Sub-Temperature Quenching Temperature on Microstructure and Property of 65Mn Steel
Authors: Li An Ming , Hu Meng Juan , Wang Xiang Jie
Published: March 2010

Influence of sub-temperature quenching temperature on the strength and hardness of 65Mn steel was studied by orthogonal regressive principle, and the microstructure of this steel after sub-temperature quenching was analyzed. Experimental results showed that the quenched structure of 65Mn steel is compound structure of lath martensite and ferrite banding. There is thin ferrite banding distributing in between the martensite laths when quenched at 780°C, accordingly the toughness is changed. The strength and hardness of 65Mn steel increased with the increasing of quenching temperature in the range of 760～780°C, the strength and hardness reached the maximum at 780°C.
Effect of Different Strength Ratio on Formability of TWBs for Square Cup Panels
Authors: Xue Song , Zhou Jie
Published: March 2010

The strength ratio between two blanks of tailor welded blanks (TWBs) plays an important role in the formability aspect. To study the strength ratio effects on the formability of TWB is significant while more and more TWBs were applied in auto industry. The formability of TWBs square cup was analyzed by numeric simulation technology in the terms of different strength combination TWBs. The results indicate that the formality goes worse dramatically when the strength ratio bigger than 2.0 and the crack located on the higher strength blank side when the crack appeared. The results are applicable.