bluuebunny/crossref_metadata_2025 huggingface dataset:
Correlation of Urinary Collagen IV: Urinary Albumin Ratio in the Prediction of Preeclampsia
Authors: Ul-Hosna Asma , Shahid Asma Rumanaz , Bhuyan AKM Mohiuddin , Thamina Hosna Zari , Salman Mohammad , Sultan Md Ashraf Uddin , Akhter Shapla
Published: March 2010

The purpose of this study was to assess the value of MA in the prediction of PE and also to compare urinary collagen IV with MA in this prediction. A total of 200 subjects (age 25±4 years, M±SC), were selected in their early pregnancy (10 to 14 weeks). Blood glucose, serum lipids, serum and urinary creatinine, urinary albumin and urinary collagen IV were measured in these subjects and they were followed up to the term for the possible development of PE, MA was defined by albumin creatinine ratio (ACR) above 32mg/g and high urinary collagen IV was defined by values above the cut-off point 2.54 ng/ml determined by the median value of the controls. The data were analyzed by grouping the subjects who developed PE in later stages of pregnancy (the PE group) and those who did not develop PE in later stages (the control group). Out of 200 subjects 94 were primigravida and 106 were multigravida. From the total subjects 16 developed PE, which shows a prevalence of about 8.4%. The PE group showed a relatively higher value of ACR as compared to control group. 106 subjects had MA out of which 13 developed PE. The sensitivity of ACR in predicting the development of PE was 80%, specificity 49.54%, PPV 12.69% and NPV 96.42%. Regarding urinary collagen IV the PE group showed no significant difference with the value of the control group. 103 subjects had high urinary collagen IV and out of them 11 developed PE. The sensitivity of high urinary collagen IV in prediction PE was found to have no significant difference with ACR in this respect. The data suggest the following conclusions:Early pregnancy levels of microalbuminuria and urinary collagen IV can be used as predictors of PE with high negative value.Urinary collagen IV has no added advantage over MA in this respect. Keywords : MA-Micro DOI: 10.3329/uhj.v5i2.4555 University Heart Journal Vol.5(2) July 2009 pp.59-62
Coronary Artery Disease in Diabetes Patients: Prevention and Management
Authors: Salman Mohammad , Rahman Mohammad Ferdous Ur , Siddique Khawer Naveed , Khan Md Mizanur Rahman , Anwar Mohammed Shahed , Ahmed Md Khurshed , Sultan Md Ashraf Uddin , Rahman Md Atiqur
Published: March 2010

Diabetes mellitus (DM) increases the risk of cardiovascular events in patients with cardiovascular disease as well as in patients without any previous history of ischemic heart disease (IHD). This inordinate increase in the risk of coronary events in diabetic patients is attributed to multiple factors, including glycation and oxidation of proteins and increased prevalence of classic risk factors of coronary disease, such as hypertension, obesity, and dyslipidemia. Despite advances in the management of cardiovascular disease, a large proportion of diabetic subjects continue to have uncontrolled hyperglycemia, hypertension, and dyslipidemia. Patients with CAD and pre-diabetic states should undergo lifestyle modifications aimed at preventing DM. In patients with CAD and DM, routine use of aspirin and an angiotensin-converting en zyme inhibitor (ACE I) - unless contraindicated or not tolerated - and strict glycemic, blood pressure, and lipid control are strongly suggested. The results after revascularization in diabetic patients are usually worse compared with non-diabetic patients. Advances in PCI include the use of drug-eluting stents and adjunctive drug therapies, such as GpIIbIIIa antagonists. Glycemic control is an important determinant of outcome after revascularization in diabetic patients. In this review, some of these landmark studies are reviewed and some practical guidelines of management are suggested. Key words: Angiotensin-converting enzyme inhibitor; Coronary artery disease; diabetes mellitus; dyslipidemia. DOI: 10.3329/uhj.v5i2.4559 University Heart Journal Vol.5(2) July 2009 pp.75-78
Venous Thromboembolism in Intensive Care Unit
Authors: Tamanna RJ
Published: March 2010

Venous thromoboembolism (VTE) represents a spectrum of disease which includes deep vein thrombosis (DVT) and pulmonary embolism (PE), a common complication in critically ill patients. VTE is difficult to diagnose, expensive to treat and occasionally lethal despite therapy. Therefore preventive measures are paramount. DVT and PE contribute significantly to morbidity and mortality associated with critical illness. But VTE remains an underestimated problem in ICU patients, despite the findings of many randomized controlled trials performed in the fields of DVT prophylaxis during the past few decades This article reviews the risk of VTE in critical care patients, thromboprophylaxis and suggests strategies to reduce the burden of thrombo-embloic disease in critical care unit. Key words: Venous thromoboembolism; Intensive Care Unit. DOI: 10.3329/uhj.v5i2.4562 University Heart Journal Vol.5(2) July 2009 pp.84-88
Isolated Pulmonary Valvular Stenosis  Noonan Syndrome  A Case Report
Authors: Siddique Md Abu , Ahmed Md Mhurshid , Hoda Md Durul , Penjore Yeshey , Ahsan Syed Ali , Sultan Md Ashraf Uddin , Salman Mohammad , Subedi Bikash
Published: March 2010

Noonan syndrome is an autosomal dominant dysmorphic characterized by hypertelorism, a downward eyeslant, and low-set posteriorly rotated ears. Other features include short stature, a short neck with webbing or redundancy of skin, cardiac anomalies, epicanthic fold, deafness, motor delay, and a bleeding diathesis. In this case report a 20 years male presented with severe pulmonary stenosis with classical sketetal abnomalities. Key words: Autosomal dominant; pulmonary stenosis DOI: 10.3329/uhj.v5i2.4564 University Heart Journal Vol.5(2) July 2009 pp.91-93
Takayasus arteritis a rare cause of hypertension and cardiac hypertrophy in Bangladeshi children- a case report and literature review
Authors: Taimur Syed Dawood Md , Muinuddin Md Golam , Jahan Salma , Islam Farzana , Ahmed Tamzeed , Islam Shiekh Md Shaheedul , Siddique Md Abu , Huque Syed Saimul
Published: March 2010

Takayasu's arteritis or pulseless disease is a chornic large vessel vasculities the cause of which is largely unknown. Takayasu's arterities is seldom reported, because it is a rare disease affecting about only 3 (three) people of every million indivisuals throughout the world, most commonly among Asian female of childbearing age. It rarely causes happertension in children. We present an 11 years old girl without typical symptomatic manifestation and with a unique presentation of headache & swelling of the body for one year. She also complainted of examinational dyspnoea for same duration and abdominal pain for six months. Her clinical examination revealed very feeble left upper limb pulse with no radio-femoral delay, different blood pressure of both arms and limbs, systolic bruits audible in left 2nd intercostal space and grade-1 apical pansystolic murmur. Her coronary angiogram report showed diffuse narrowing of a long segment of abdominal aorta, severe stenosis of proximal left subclavian artery and stenosed right renal artery. In this article we will describe a Takayasu's arteritis (TA), a rare cause of childhood hypertension. Keywords: Takayasu's arteritis (TA);Vasculitis; Hypertension. DOI: 10.3329/uhj.v5i2.4565 University Heart Journal Vol.5(2) July 2009 pp.94-96
Lectures on Cardiovascular System by Prof. Abdullah Al Shafi Majumder
Authors: Hoque Md Harisul
Published: March 2010

DOI: 10.3329/uhj.v5i2.4566 University Heart Journal Vol.5(2) July 2009 pp.97
Imogolite Reinforced Nanocomposites: Multifaceted Green Materials
Authors: Yah Weng On , Yamamoto Kazuya , Jiravanichanun Nattha , Otsuka Hideyuki , Takahara Atsushi
Published: March 2010

This paper presents an overview on recent developments of imogolite reinforced nanocomposites, including fundamental structure, synthesis/purification of imogolite, physicochemical properties of nanocomposites and potential applications in industry. The naturally derived nanotubular material of imogolite represents a distinctive class of nanofiller for industrially significant polymer. The incompatibility between the surface properties of inorganic nanofiller and organic matrix has prompted the need to surface modify the imogolite. Early problems in increasing the binding properties of surface modifier to imogolite have been overcome by using a phosphonic acid group. Different approaches have been used to gain better control over the dispersal of nanofiller and to further improve the physicochemical properties of nanocomposites. Among these, polymer grafting, in situ synthesis of imogolite in polymer matrix, and spin-assembly are some of the promising methods that will be described herein. This imogolite reinforced nanocomposite of enhanced optical and mechanical properties, and with unique biological and electronic properties, is expected to become an important category of hybrid material that shows potential for industrial applications.
Antioxidant Properties of Cap and Stipe from Coprinus comatus
Authors: Li Bo , Lu Fei , Suo Xiaomin , Nan Haijuan , Li Bin
Published: March 2010

Coprinus comatus, also called chicken drumstick mushroom, is currently commercially available in China. Hot water and ethanolic extracts were prepared from cap and stipe of C. comatus fruit bodies and their antioxidant properties were studied. Ethanolic extract from stipe showed high antioxidant activity (80.6%) at 1 mg/mL. Reducing power of hot water extracts from cap was 1.653 at 10 mg/mL. Extracts from cap showed better scavenging ability on DPPH (57.9% at 1 mg/mL) than stipe ones. Ethanolic extracts were more effective in scavenging ability on hydroxyl radicals (57.4–61.3% at 5 mg/mL) than hot water extracts. Ethanolic extracts showed moderate scavenging ability on superoxide radicals (46.3–47.0% at 20 mg/mL). Naturally occurring antioxidant components including total phenols (3.60–20.00 mg/g), tocopherols (0.58–11.93 mg/g), flavonoids (0.19–3.52 mg/g) and polysaccharides (58.52–547.86 mg/g) were found in the extracts. Overall, extracts from cap were more effective for the antioxidant properties assayed.
Raman Spectroscopy and Related Techniques in Biomedicine
Authors: Downes Andrew , Elfick Alistair
Published: March 2010

In this review we describe label-free optical spectroscopy techniques which are able to non-invasively measure the (bio)chemistry in biological systems. Raman spectroscopy uses visible or near-infrared light to measure a spectrum of vibrational bonds in seconds. Coherent anti-Stokes Raman (CARS) microscopy and stimulated Raman loss (SRL) microscopy are orders of magnitude more efficient than Raman spectroscopy, and are able to acquire high quality chemically-specific images in seconds. We discuss the benefits and limitations of all techniques, with particular emphasis on applications in biomedicine—both in vivo (using fiber endoscopes) and in vitro (in optical microscopes).
Position Error Compensation via a Variable Reluctance Sensor Applied to a Hybrid Vehicle Electric Machine
Authors: Bucak İhsan Ömür
Published: March 2010

In the automotive industry, electromagnetic variable reluctance (VR) sensors have been extensively used to measure engine position and speed through a toothed wheel mounted on the crankshaft. In this work, an application that already uses the VR sensing unit for engine and/or transmission has been chosen to infer, this time, the indirect position of the electric machine in a parallel Hybrid Electric Vehicle (HEV) system. A VR sensor has been chosen to correct the position of the electric machine, mainly because it may still become critical in the operation of HEVs to avoid possible vehicle failures during the start-up and on-the-road, especially when the machine is used with an internal combustion engine. The proposed method uses Chi-square test and is adaptive in a sense that it derives the compensation factors during the shaft operation and updates them in a timely fashion.
Antimicrobial susceptibility of Salmonella Typhi in India
Authors: Nagshetty Kavita , Channappa Shivannavar T. , Gaddad Subhashchandra M.
Published: March 2010

Background: Typhoid fever continues to remain a major public health problem, especially in regions such as Gulbarga, due to poor sanitation and personal hygiene. Gulbarga region is often prone to enteric fever outbreaks and is an endemic region of typhoid fever. Enteric fever caused by Salmonella Typhi has not been adequately explored in this region. Methodology: A total of 95 isolates of S. Typhi collected from different clinical and environmental sources were tested for antimicrobial susceptibility according to the CLSI guidelines. MIC of resistant isolates to various antibiotics was performed by agar dilution method. Results: Of the total isolates studied, 10% were found to be multidrug resistant (MDR) (defined as resistance to ampicillin, chloramphenicol and co-trimoxazole). There was a decrease in the susceptibility to ciprofloxacin of S. Typhi with MIC showing an upward trend (0.125-4µg/mL). Concurrently, there has been an increase in the number of isolates sensitive to all antibiotics except nalidixic acid. Conclusion: MDR S. Typhi continues to be an important public health issue in Gulbarga. Presence of quinolone resistance and associated low-level ciprofloxacin resistance is a concern and requires further study.
Can treatment delay be utilized as a key variable for monitoring the pool of infectious tuberculosis in a population?
Authors: Storla Dag Gundersen , Yimer Solomon , Bjune Gunnar Aksel
Published: March 2010

Background: A major goal of tuberculosis control programs is to stop community transmission of Mycobacterium tuberculosis. However, this can not be rapidly accomplished because, in endemic areas, most of the population is already infected, serving as a reservoir that continuously contributes to the pool of infectious cases. Tuberculin surveys are the main tools used to monitor the infectious pool, but there are serious methodological constraints, and they require resources and expertise that are often unavailable. There is an urgent need for alternative means to monitor the epidemic at the local level. Methodology: We investigated whether a systematic registration of treatment delay in the tuberculosis program records of the Amhara Region of Ethiopia could be utilized to estimate the infectious pool of tuberculosis. Results: The study showed that the total number of infectious days and hence an estimate of the infectious pool could be calculated by recording the treatment delay for new TB cases, retreatment cases and failures, and by estimating the number of undiagnosed cases . Of these categories, treatment delay among new smear-positive tuberculosis cases contributes the greatest number of infectious days. Conclusions: A local tuberculosis program can use a systematic recording of treatment delay as a quantifiable variable to monitor the infectious pool, and can also serve as a key indicator of program performance.
Survey of Salmonella serovars in broilers and laying breeding reproducers in east of Algeria
Authors: Ammar Ayachi , Alloui Nadir , Bennoune Omar , Kassah-Laouar Ahmed
Published: March 2010

Background: Avian salmonellosis affects the poultry industry in underdeveloped and in developed countries. The aim of this study was to identify the most common Salmonella serovars in broilers and laying breeding reproducers in Eastern Algeria according to the ISO 6579 method. Methodology: A total of 294 samples were obtained from two flocks of 10,000 broilers and laying breeding reproducers. Samples included livers and spleens, drag swabs of bottom boxes of young chickens, cloacal swabs, and faecal samples of chickens.  Additional samples were also taken from water, feed and dusty surfaces. Results and conclusions: Only the cloacal swabs, poultry faeces and samples from dusty surfaces were positive for Salmonella Typhimurium and Salmonella Livingstone with a detection rate of 12% and 1.6% respectively. The results showed evidence of legislative failure regarding biosafety within the poultry industry in the area of Batna, Eastern Algeria.
Complications and Efficiency of Liver Biopsies using the Tru-Cut Biopsy Gun
Authors: Cevik Figen Caglan , Aykin Nevil , Naz Hasan
Published: March 2010

Objectives: The study aimed to evaluate the complications and quality of the specimens of percutaneous liver biopsy in patients with chronic viral hepatitis who were scheduled for treatment and also to evaluate the contribution of the knowledge of ultrasound guided (USG) biopsy localization to the existing data. Methodology: Liver biopsies conducted at our clinic between 2003 and 2008 were retrospectively evaluated. In 53.8% of the cases, hepatobiliary USG was performed to mark the localization of the biopsy site. An automatically triggered Tru-Cut biopsy gun was used. Results: Biopsies waere taken from the livers of 236 patients (46.6% male, 53.4% female) with a mean age of 47.1 ± 12.5 years. The majority of patients had hepatitis C (61.9%); 1.6% experienced major complications (3 patient biliary peritonitis, 1 patient liver bleeding); 52.1% of the samples were ≥ 1 cm in length; And 69.7% of the biopsy samples with specified portal area had ≥ 4 portal areas. There was no statistically significant difference between the  patients with localized and non-localized biopsy site in terms of major complications and length of biopsy samples ( respectively p = 1.000, p = 0.209 ). Conclusion: We believe that percutaneous liver biopsy using Tru-Cut biopsy gun can be peformed safely, with complications in 1.6% of the procedures. The length of the biopsy specimen is shorter than ideal values. Evaluation of the patients with and without USG-guided biopsy revealed no significant difference in terms of major complications and specimen size.
Analysis of chemokines and soluble adhesion molecules in cytomegalovirus-positive renal transplant recipients
Authors: Obeid Obeid E , Alzahrani Alhusain J
Published: March 2010

Background: The relationship among cytomegalovirus (CMV) infection and the serum level of chemokines and soluble adhesion molecules is not well studied. This study aimed to assess chemokines and soluble adhesion molecules in CMV-positive Saudi renal transplant recipients. Methodology: The study was conducted in a tertiary hospital in Eastern Saudi Arabia over a 12-month period. All kidney transplant recipients who regularly attended the nephrology clinics were included (n = 150). Randomly selected age- and sex-matched individuals served as a control group (n = 158). CMV antibodies (IgG and IgM), chemokines and soluble adhesion molecules were measured using standard enzyme-linked immunosorbent assay (ELISA). CMV viral DNA was detected using real time polymerase chain reaction (PCR). Results: Of the 150 patients studied, 149 (n = 150) had detectable levels of Anti-CMV IgG antibodies (99.3%). In the control group, 113 (n = 158), blood donors had anti-CMV IgG antibodies (71.5%). Forty-one (n = 150) kidney transplant recipients were positive for anti-CMV IgM antibodies (27.3%), whereas only one (n = 158) blood donor had detectable anti-CMV IgM antibodies. All IgM positive samples contained CMV viral DNA.  MCP-1, IL-8, ICAM-1, and VCAM-1 levels were measured using ELISA. Of those, only MCP-1 and IL-8 were detectable. Eighteen kidney transplant recipients were positive for MCP-1 (12%). All MCP-1 patients were also anti-CMV IgM positive, while 5 patients had detectable levels of IL-8 (3.3%). All these patients were CMV IgM-positive. Conclusions: The increase in chemokine levels during CMV infection may reflect a possible role for these molecules in the immunopathogenesis of CMV infection in this study population.
The effect of Point Mutations in Dihydrofolate reductase genes and Multidrug resistance gene 1-86 on treatment of falciparum malaria in Sudan
Authors: Yusuf Rahma Udu , Omar Sabah Ahmed , Ngure Raphael Muchangi
Published: March 2010

Background: One of the major problems to the treatment of malaria is the emergence and spread of parasite resistant to antimalarial drugs. Due to increased chloroquine (CQ) resistance, the antifolate combinations are becoming important in the chemotherapy of falciparum malaria. However, resistance to antifolate exists and they are still effective in the above combinations. This study aimed at determining the prevalence of antimalarial drug resistance markers in P. falciparum isolates, involving the detection of mutations at the mdr 1- 86 which associates with amodiaquine resistance, and dhfr mutations associated with SP resistances. Methods: The dot-blot/ probe hybridization, which is more sensitive and specific; it detects parasitaemia of less than 100 parasites/µl of blood, and can identify a minority parasite genotype down to 1% in a mixture, was adopted to determine multi-drug resistance (mdr1-86) to show the correlation of Amodiaquine (AQ) resistance and PCR/ RFLP adopted to determine dihydrofolate reductase (dhfr) baseline resistance to Sulphadoxine- Pyrimethamine (SP) resistance in Nubian region of southern Sudan. A randomized open label trial of Artesunate (AS) + SP and AS+ SP was carried out in children less than 5 years. Molecular analysis of filter paper preserved blood samples collected was carried out to provide a baseline estimate of allele prevalences. Results: Baseline of the allele prevalence of the mdr1 86 locus in the AS+ AQ was successful for 80 isolates: 71(8.11%) carried parasites harbouring the mdr1-86 Tyr resistance allele, while 7 (89.19%) carried mdr1-86 Asn sensitivity allele and 2 (2.7%) were of mixed infection, having both resistance and wild type allele. Overall, the prevalence of the dhfr point mutation, codon 51, 59 and 108: 82.5% (132/160) carried mutations at dhfr (N51I, C59R or S108N), but triple mutants were rare (3.1%) in the AS + SP arm. Conclusion: The research provides the evidence that mutations present in dhfr and mdr1 86 has a significant effect on the type of treatment following SP and AQ chemotherapy. SP resistance may spread rapidly, and AS + AQ is likely to be a better option, provided AQ use is restricted to the combination. The significance of the study shows that definitely combination of drugs improves SP therapy at the study site. Keywords: Antimalarial drugs, P. falciparum, dhfr, mdr-1, dot-blot hybridisation technique, PCR/RFLP
Research on the Digital Industrial Design System Integrated with Product Data Management System
Authors: Jiang Xian Feng , Li Jun Yuan
Published: March 2010

Digital industrial design system combines the digital technology and industrial design process，and integrates the sub-systems of digital modeling, digital assemble, digital evaluation, digital manufacture, and digital information exchange. In order to let the industrial design work process and the design data flowing fluently around such sub-systems, Product Data Management (PDM) system is introduced here as the basic integration platform of the sub-systems to let the design process flow and design data flow working well. The product digital industrial design platform basic functions and its system structure is analyzed, and a general model and function frame of product data management system oriented to digital industrial design is presented in this paper to solve its characteristic data composition, integrative method of application software and industrial design flow in the process of the digital industrial design. Results about the working process integrative model, control process model, product class definition model, and the logical structure of the digital industrial design platform with the PDM system are also established. An application results for certain product development show that such digital industry design system can make the helps for the design work efficiency and the follow-up engineering design accuracy.
Virtual Assembly of Ball Valve Based on Computer Supported Cooperative Design
Authors: Xie Fang , Wang You Jun , Lv Qiu Juan , Qin Zhong Bao
Published: March 2010

This paper introduces how to use the AutoCAD, Pro/E,VRML, Javascript, Dreamweaver and other computer-related software to complete the virtual ball valve assembly based on Computer Supported Cooperative Design. This paper also describes some ways to resolve contradictions and problems when related software worked together.
Thermal Analysis and Optimization of Plant-Fiber and Starch Dishware Mould Based on ANSYS
Authors: Zuo Xiao Ming , Xu Zhao Mei
Published: March 2010

The plant-fiber and starch have widly applications in the dishware materials, which can be taken place of the plastic packaging materials, the plant-fiber and starch dishware can eliminate the white pollution problem effectively for the environment. The mold for the plant-fiber and starch dishware is important for its manufacturing. In this paper, the finite element thermal analysis model of the plant-fiber and starch dishware mould is developed by using the Pro/E, then temperature profile of the mould was analyzed by using ANSYS based on the thermal analysis theory. At last, the structural parameters are optimized based on iterative method. The present analysis provid the theoretical basis for the applications of the mould for the plant-fiber and starch materials.
Three Dimensional Reconstruction System Based on Laser Radar
Authors: Tian Cheng Jun , An Zhi Yong , Li Li Juan , He Bing Gao
Published: March 2010

With the development of manufacturing, obtaining 3D data of objects surface effectively and precisely has been important. In this paper, laser radar is selected to gain 3D geometric data by comparing the current digital measurement techniques, and the measurement principle of laser radar is discussed in detail. For obtaining the whole surface points cloud of work piece and reducing the error of station moving, the mathematical model of station moving is established. This paper also analyzes the characteristics of points cloud data collected using laser radar, estimates the normals of scattered points with PCA method. Finally, the 3D surface of work piece is reconstructed using radial basis function interpolation.This system has the advantages of fast measurement speed, large measurement range and high degree automation.Because laser radar uses optical non-contact measurement mode, so there are no special requirements of the object surface.
Seismic Response Analysis of an Adsorption Tower Based on ANSYS
Authors: Hu Xiao Ping , Ye Xiao Ping
Published: March 2010

The seismic load usually has a significant hazard to the safety of the tower equipment, so it’s important to execute of seismic design in engineering practice. In this paper, the time history analysis of the seismic response is carried out with the help of ANSYS software for the finite element model of the adsorption tower. Relevant time history data is obtained. Compared with seismic analysis of the current standard method, corresponding suggestions are given.
Finite Element Analysis for the Crankshaft of the Piston Compressor
Authors: Zhao Bin
Published: March 2010

In order to study the static and dynamical characteristics of the crankshaft, ANSYS software was used to carry out the corresponding calculations. The entity model of the crankshaft was established by UG software firstly, and then was imported into ANSYS software for meshing, and then the finite element model of the crankshaft was constructed. The crankshaft satisfied the requirement of stiffness and strength through static analysis. The top six natural frequencies and corresponding shapes were acquired through modal analysis, and the every order critical rotating speed of the crankshaft was calculated. The fatigue life of the crank was calculated by fatigue module of ANSYS software finally. These results offered the theoretical guidance for designing, manufacturing and repairing the crankshaft.
Design of the Intelligent Lightning Protection System
Authors: Wang You Jun , Tong Ke , Hou Li An , Zhuang Hong Chun , Xie Fang
Published: March 2010

The paper mainly introduces the methods of the designing of an intelligent lightning protection system, and its methods of lightning protection are different from conventional ones and are called plasma lightning protection and charge lightning protection. According to the physical process of effective lightning protection, it established the technical condition which the system should fulfill and achieve the purpose of its effective lightning protection.
Research on Rapid Manufacturing of Functionally Graded Mold by Electroforming and Arc Spray
Authors: Liu Chang Sheng , Zeng Hao Ping , Du Hai Qing , Fan Wei
Published: March 2010

Functionally graded mold (FGM) is the trend in the development of modern mold. Based on the optimization of electroforming and arc spray forming, a functionally graded mold with the structure of Ni-NiAl-ZnAl-Zn was manufactured, and the microstructure of the mold shell was analyzed. The experiments show that the manufacturing of functionally graded mold by electroforming and arc spray forming is feasible in engineering. The research is of significant value in exploring new manufacturing technology of functionally graded mold.
Three-Dimensional Modeling and Finite Element Analysis of Ladle Turret
Authors: Zhang Xiao Chun , Yuan Zhen Wen
Published: March 2010

In this paper the Finite Element Method (FEM) is applied to verify the reliability of the steel ladle turret while the steel ladle capacity was extended. The three-dimensional model of the ladle turret parts were constructed with the 3D digital modeling technology. The models of main subassembly that need to be checked were digitally assembled imitatively. The key forcing parts were FEM Meshed and analyzed the stress and the displacement. The verify check results show that the coefficient of safety of the equipment is large enough for the ladle capacity raised from 300t to 320t without changing the structure of ladle turret. It can meet the strength requirement after the ladle capacity was extended. The digital assembled model of the equipment can also be used for further digital mechanism analysis.
Optimum Design of a High Power Density Magnetic-Gel Brake Base Using Neural Network Model and Genetic Algorithm
Authors: Lv Hong Zhan , Liang Xi Chang
Published: March 2010

An integrated approach based on genetic algorithm (GA) and an artificial neural network (ANN) is presented for structural optimization of a high power density magneto-gel brake. For this method, the GA method is employed for obtaining the optimal configuration of the brake by minimizing the dimensions of the brake. Subsequently, a two-layer BP neural network model is trained to obtain the correlation between main design parameters and performance of the brake, and then it is used to predict the performance of the magnetic gel brake with high power density. The coupled method incorporating the ANN with GA can reduce substantially the computation time during optimizing brake performance. Meanwhile, the proposed method’s validity is demonstrated by comparisons between the experiment and existing data.
Kinematics Analysis of Mechanisms Based on Dynamics Multibody Systems in Virtual Assembly Environment
Authors: Zhang Zhi Xian , Liu Jian Hua , Ning Ru Xin
Published: March 2010

In recent years, in view of the absence of kinematics analysis function of mechanisms in the virtual assembly system, the method of kinematics analysis of mechanisms based on dynamics of multibody systems in virtual assembly environment is presented. A mechanism is considered as a multibody system and the kinematics equations are established based on Descartes coordinate system. All the kinematics parameters, just like position, speed and acceleration, can be obtained through solving the kinematics equations. In addition, the realization method of mechanism motion simulation in virtual assembly system is also proposed which contains the hiberarchy, data structure, module classes and simulation process of the system. The method is implemented and validated based on the prototype system VAPP(Virtual Assembly Process Planning).
Studies on the Springback Mechanism of Incremental Sheet Forming Based on FEM Simulation
Authors: Han Fei , Mo Jian Hua , Cui Xiao Hui , Wang Zai Lin
Published: March 2010

Incremental sheet forming (ISF) is an innovative and highly flexible sheet metal forming process for small batch production and prototyping, but springback is a very important factor to influence the quality of incremental sheet forming. This paper investigates the springback mechanism of incremental sheet forming using numerical method. A three-dimensional elasto-plastic finite element model was established for the simulation of the incremental sheet forming process. In this model, the combination of dynamic explicit algorithm and the static implicit algorithm was proposed to calculate the whole forming process including springback. The results of numerical simulation, such as, the strain history and distribution, the stress state and distribution, etc., are discussed in details. Moreover, the results confirm that residual stress has been releasing during forming process, which reveal the peculiar springback characteristic of incremental sheet forming process.
A Rapid Parametric CAD System for Fine-Blanking Progressive Dies
Authors: Wang Yi Lin , Long Hui Cai
Published: March 2010

Fine-blanking is an advanced and precision stamping process. Designing the construction die is an important part of the entire development process. But for lots of special and complicated structures of fine-blanking dies, especially some progressive dies, many problems occurred during the traditional two-dimensional design method, such as heavy workload, time-consuming, difficulty of modification, difficulty of checking interference, difficulty of novice entry. To solve these problems, a rapid parametric CAD system based on SolidWorks is developed for fine-blanking progressive dies in the present study. The system comprises five modules, namely DIEBASE, WORKPART, STANDARD, MOTION and DRAWING. The first three modules are designed for the rapid designing and modeling of three different sets of die components. These modules work in tandem with the design-table-based standard part libraries. The MOTION module is designed to simulate the movement situation and check the interferences of the die structure. The last module is designed for the drawing documents of the die parts and assembly. The main feature of the system is its parameter-based interfacing for fine-blanking progressive die design. The design and modification jobs could be done easily and quickly by operating this system, and the system is easy to learn for semiskilled and even unskilled engineers. An illustrative example is demonstrated to show the usefulness of the system.
Research and Implementation of 3D Surface Finite Element Mesh Generation Based on STEP
Authors: Jia Hong , Wang Yu Huai , Lu Yan Lin
Published: March 2010

CAE analysis plays an important role in die and mould manufacturing. In order to improve the modeling ability of the existing CAE analysis system, the paper presents a STEP based method by improving the integration ability of CAE systems and CAD tools. And an improved strategy for mesh generation is described and the application system based on the strategy is implemented. Results show that the presented method helps to not only improve the mesh quality but also increase the process efficiency and reduce the time cost.
Modal Analysis of Precision Lapping Machine
Authors: Mou Zhao Yu , Wang Wei Fang , Gao Peng Fei , Wen Dong Hui
Published: March 2010

A new method was used to analysis the performance of Nano-MAX lapping machine under working condition. Model analysis in ANSYS and operational model analysis in LMS Test.Lab are banded together properly, which reduce the calculation difficulty. Time frequency analysis method is also used to study in which speed is the most suitable one for processing of Nano-MAX lapping machine. Model analysis results reveal that 100Hz is the natural frequency of chassis and the workbench and 178Hz is the natural frequency of chassis and spindle outer covering. If the exciting frequency is 100Hz or 178Hz, there will be two mechanical parts set up resonance which will likely to cause the whole machine resonance.
The Estimate of Confidence Level for Part Dimension and Fits Test
Authors: Wu Xiao Ming
Published: March 2010

The double(unilateral)index subjection function model for part dimensional test is constructed, the checkout limit range is partitioned by process capability index, then distributing law of measure dimension is used to estimate the confidence level about part dimentional test and fits test by fuzzy theory. Finally an example is given and the proposed method proves to be feasible and valid.
Design on Same Axis Double Index of Motorcycle Based on MCU
Authors: Li San Bo
Published: March 2010

A new design method on showing motorcycle velocity and speed is introduced, which is controlled by P87LPC64 SCM and driven by VID66-08 CMOS chip. It consist of some module including SCM, sensor, velocity information unit, speed information unit, mileage information unit, mileage drive, double axis step-drive electromotor index show, LED show module. The system has some trait such as new exterior, low cost, hign precision, little error, direct show, micromation. Experiment result prove that the method is effective.
Research on Knowledge Management Oriented Product Features Knowledge Reconfiguration in Discrete Enterprise
Authors: Lv Hong Bo , Chen Ping , Wang Qi Feng
Published: March 2010

Product knowledge reuse is more emphasized by discrete enterprises nowadays. But their small batches, multi-product, and high frequency new products development restricts them to reuse this. Analyze demands of knowledge reconfiguration in discrete enterprise. Propose a product feature based mathematical expression. Promote knowledge nodes of product-feature-model. Then use these models to fulfill KR process in KMS. Increase discrete enterprise’s adaptability and creativity in the nowadays rapidly changing-competitive business environment.
Experimental Research on Self-Alignment Design Principle of a Large-Scale Precise Machine Bed
Authors: Yan Zhan Hui , Cao Yi , Yu Jun Yi
Published: March 2010

In order to eliminate thermal deformation of large-scale precise machine tools caused by ambient temperature change, self-alignment design principle and key points are proposed for a large-scale precise machine tools, Self-alignment simulation experiment, machined parts experiment and compared results for self-alignment rail grinder and other similar products are analysed, the present analysis show that self-alignment rail grinder has many advangtages of good precision, straightness stability.
Numerical Simulation of Three-Dimensional Cathode Flow Field of ECM for Inner-Wall Rectangle Weight-Reduction Blind Groove
Authors: Wu Jian Min
Published: March 2010

In order to design the flow field of the NC-Electrochemical Machining (NC-ECM), a three-dimensional physical model of the flow passage is constructed based on the characteristic of the fluid flow, and three-dimensional flow field simulation is conducted with the applications of the Reynolds time-averaged Navier-Stokes equations and standard k- turbulence numerical model, velocity vectors on workpiece surface are calculated respectively based upon the three cathode outlet slots under the steady electrochemical machining condition. The present analysis show that electrolyte insufficiency appeared on workpiece surface for initial cathode flow field, and the experiment results verified the correctness of numerical simulation.
Discussion on Colour Design of Medical Product Based on Visual Negative Afterimage Theory
Authors: Xiong Xing Fu , Xiong Chen
Published: March 2010

This paper mainly analyses and discusses the application and significance of the visual negative afterimage on the colour design of medical product based on the visual negative afterimage theory. The design for the colour of medical product based on the visual negative afterimage theory focuses more human orientation in aspect of the visual effect design. The paper also points out that the trend of future design is to organically combine the art, the therapy features and the humanity.The complementary colour equilibrium of the visual negative afterimage will play a more and more important role in the colour design of the medical product. In the modern medical environment, the colour of the medical product has a decisive effect on the information exchange between people and the space environment. Although the visual negative afterimage is common in our daily life, the colour is not taken into consideration in the colour design of the medical product, which will result in negative effects. The colour is a strong and extremely attractive expression tool. Therefore, when the colour is designed for the medical product, it should be applied reasonably. The application of colour must be based on the special function requirements and the use of different people, so as to show its special function and requirements, which not only avoids the negative influence caused by the visual negative afterimage, but also creates a more humanistic atmosphere for the medical environment.
Personas Building and Digital Contents Design for Chinese Farmers
Authors: Ying Fang Tian , Ye Mi Lan , Yao Li Ning , Zhu Peng Cheng
Published: March 2010

This paper analyzed the core characteristics of Chinese farmers using digital content service based on persona building method, which involved quantitative research, persona hypothesis, quantitative research and persona building. Common Goals are concluded and 4 groups of design concepts are developed later in this paper, based on the demand of 6 built personas.
Innovative Design and Optimization of Molded Honeycomb Mold
Authors: Ma Su Chang , Yan Bing , Liu Ping , Tan Run Hua
Published: March 2010

Considering the low productivity of fixed molded honeycomb mold, an efficient turning molded honeycomb mold is developed. Using TRIZ theory, a technical analysis of fixed molded honeycomb mold is conducted. Through the TRIZ innovation principles of the Spheroidality, combined with the characteristics of the mold, innovative design of the rotary molded honeycomb mold has been made. According on the Pro/MECHANICA analysis platform, by the finite element analysis method, the actual molded honeycomb mold forces, boundary conditions and imposed load are being researched in the view of the molded honeycomb mold for the actual operating conditions. The sensitivity analysis of mold parameters is conducted so as to optimize the structure parameters of mold. Shown by the practical application, the rotary molded mold can improve the productivity significantly.
Electromechanical Coupling Study on the Pull-in Parameters of Electrostatic Cantilever Microbeam
Authors: Tao Ye , Wen Sheng
Published: March 2010

In this paper, the coupling electromechanical model is proposed for a cantilever microbeam in microelectromechanical system (MEMS). Based on mechanics of plate and theories of electrostatic field, the coupling electromechanical behavior of the cantilever microbeam is investigated. The pull-in voltage is accomplished using the increment-iterative method. The effectiveness of the proposed method is verified by comparing numerical results with that in the literature. The numerical results show that the pull-in voltage decreases with the improvement of the ratio of the width of micro beam to the initial gap between the electrodes.
Temperature Tag Based on Active RFID
Authors: Tao Ye , Geng Shou Fu , Lian Hou Wei
Published: March 2010

In view of the problems that we can not real-time monitor and record temperature even when the temperature exceeds a certain limit the system can not alarm, leading to deterioration of food rotting in the refrigerated transport process. So we propose and establish a real-time monitoring and recording system based on active RFID technology. The system uses active RFID technology characteristics and the communication protocol between the Reader and the host computer to monitor and record the temperature during transport. The configuration of the tag can widen the range of applications, so you can change the parameters of the tag with configurator. The tag's size is small and it has flexible applicability and strong adaptability. Test results show that the general range of temperature tag is -50～120°C between the error of ± 1°C. The rate of Reader is 100%, and the tag can launch to about 100 meters. The system does not only solve the problem of temperature during refrigerated transport, but also provides a theoretical for long-distance transmission of RFID.
Design and Analysis for a Nano-Positioning Micro-Motion Platform Driven by Piezoelectric Ceramic Linear Motors
Authors: Lin Hai Bo , Yang Guo Zhe
Published: March 2010

Micro-EDM provides the potential feasibility for the nano-scale precision machining, and Micro-EDM is suitable for three-dimensional complicated structure processing. A three-dimensional model is conducted in this paper, and the key factors of a platform are analysed in detail, the positioning accuracy of the platform is tested on this basis of the model. The results of the test show that dynamic behavior and stability of this mechanism has many advantages of quick response, smooth, ultra low speed and super resolution etc. High positioning accuracy can be achieved by this platform, so it complies with the requirement of micro-EDM.
Technology Analysis and Optimization for High Pressure Casting of the Gearbox Shell of a Drill
Authors: Che Liang Song , Pan Bai Song , Peng Ting Hong , Zhang Sheng Hong
Published: March 2010

Casting process of the gearbox shell of a drill is simulated based on different technological conditions by analysis software ProCAST and orthogonal experiment method. The optimizing target is the shrinkage. It can be concluded that the factors that affect shrinkage are casting temperature, casting velocity, mold initial temperature and the cross-sectional area of inner gate in the gating system. Through analyzing the diagram of factor levels influent trend which is described according the last simulated results, the most optimized process parameters scheme is got, and the process scheme is simulated.
Research on Realization and Application of Uniformly Accelerated Motion in NC Systems
Authors: Yang De Qing , Yu Ying Liang
Published: March 2010

The uniformly accelerated motion in NC systems is analysed based on the constitution and realization of a uniformly accelerated motion, in order to implementing the uniformly accelerated motion, the corresponding means is explained, the conversion of program parameters is calculated, the rule of uniformly accelerated motion is analyzed and some factors, and the effect on the uniformly accelerated motion is illuminated.
Improved Freeman-Newell Functional Reasoning Model for Conceptual Design of Manufacturing Process Control Strategies
Authors: Liu Ge Qun
Published: March 2010

An improved Freeman-Newell functional reasoning model is proposed for the conceptual design of manufacturing process control strategies. The structure in Freeman-Newell model is partitioned into determined subset and undetermined subset. Main framework of the structure is expressed by determined subset. Undetermined subset is presented to express the functions required from next design level. In this way variant design and multi level design reasoning can be supported. Based on the improved Freeman-Newell model, multi level conceptual design methodology for control strategies of manufacturing process is presented. Tracking control algorithm design for a nonlinear manufacturing process plant is provided as the example to verify the design reasoning ability of the improved model.
Layered Manufacturing by Reverse Engineering-Principle and Application
Authors: Li Chang He , Fang Zan , Cui Yi , Ding Y.C.
Published: March 2010

Additive processes can be defined as layered manufacturing, based on the dispersed/accumulated principle, Layered manufacturing is directly transforming 3D CAD models to real objects, the reverse engineering of mechanism can be applied to layered manufacturing for production complex geometries for long-term consistency, and the analysis demonstrates the application of the reverse engineering fulfills the segments of design, production, inspection, test. The most notable advantage is the combination of digital technology and geometric model rebuilding technology.