bluuebunny/crossref_metadata_2025 huggingface dataset:
On ideal convergence in probabilistic normed spaces
Authors: Mursaleen M. , Mohiuddine S.
Published: December 2011

An interesting generalization of statistical convergence is I-convergence which was introduced by P.Kostyrko et al [KOSTYRKO,P.—ŠALÁT,T.—WILCZYŃSKI,W.: I-Convergence, Real Anal. Exchange 26 (2000–2001), 669–686]. In this paper, we define and study the concept of I-convergence, I*-convergence, I-limit points and I-cluster points in probabilistic normed space. We discuss the relationship between I-convergence and I*-convergence, i.e. we show that I*-convergence implies the I-convergence in probabilistic normed space. Furthermore, we have also demonstrated through an example that, in general, I-convergence does not imply I*-convergence in probabilistic normed space.
A class of linear positive operators in weighted spaces
Authors: Erençin Ayşegül , Gül İnce H. , Olgun Ali
Published: December 2011

In this paper, we introduce a class of linear positive operators based on q-integers. For these operators we give some convergence properties in weighted spaces of continuous functions and present an application to differential equation related to q-derivatives. Furthermore, we give a Stancu-type remainder.
Cosine of angle and center of mass of an operator
Authors: Paul Kallol , Das Gopal
Published: December 2011

We consider the notion of real center of mass and total center of mass of a bounded linear operator relative to another bounded linear operator and explore their relation with cosine and total cosine of a bounded linear operator acting on a complex Hilbert space. We give another proof of the Min-max equality and then generalize it using the notion of orthogonality of bounded linear operators. We also illustrate with examples an alternative method of calculating the antieigenvalues and total antieigenvalues for finite dimensional operators.
A note on representation of pseudovariant maps
Authors: Das Ruchi , Das Tarun
Published: December 2011

We define and study the notions of pseudovariant maps and pseudogeny maps on G-spaces. We prove that the set of all pseudogenies of a locally comapct G-space is a group. We further obtain representation of pseudovariant maps in terms of pseudogenies. Finally, we obtain Tietze type extension result for pseudovariant homotopies defined on locally compact second countable G-spaces.
Molecular differences between GM- and non-GM crops over-estimated?
Authors: Ammann Klaus
Published: January 2012

Peer reviewed contribution available on the following websites:Public Research Initiative: www.pubresreg.orgEuropean Federation of Biotechnology: http://www.efb-central.org/Nepal Journal of Biotechnology. Jan. 2011, Vol. 1, No. 1 : 31-48
A computed tomography–based feasibility study of translaminar screw placement in the pediatric thoracic spine
Authors: Molina Camilo , Sciubba Daniel M. , Chaput Christopher , Tortolani P. Justin , Jallo George I. , Kretzer Ryan M.
Published: December 2011

Object

Translaminar screws (TLSs) were originally described as a safer alternative to pedicle and transarticular screw placement at C-2 in adult patients. More recently, TLSs have been used in both the cervical and thoracic spine of pediatric patients as a primary fixation technique and as a bailout procedure when dysplastic pedicle morphology prohibits safe pedicle screw placement. Although authors have reported the anatomical characteristics of the cervical and thoracic lamina in adults as well as those of the cervical lamina in pediatric patients, no such data exist to guide safe TLS placement in the thoracic spine of the pediatric population. The goal of this study was to report the anatomical feasibility of TLS placement in the thoracic spine of pediatric patients.

Methods

Fifty-two patients (26 males and 26 females), with an average age of 9.5 ± 4.8 years, were selected by retrospective review of a trauma registry database after institutional review board approval. Study inclusion criteria were an age from 2 to 16 years, standardized axial bone-window CT images of the thoracic spine, and the absence of spinal trauma. For each thoracic lamina the following anatomical features were measured using eFilm Lite software: laminar width (outer cortical and cancellous), laminar height (LH), maximal screw length, and optimal screw trajectory. Patients were stratified by age (an age < 8 versus ≥ 8 years) and sex.

Results

Collected data demonstrate the following general trends as one descends the thoracic spine from T-1 to T-12: 1) increasing laminar width to T-4 followed by a steady decrease to T-12, 2) increasing LH, 3) decreasing maximal screw length, and 4) increasing ideal screw trajectory angle. When stratified by age and sex, male patients older than 8 years of age had significantly larger laminae in terms of both width and height and allowed significantly longer screw placement at all thoracic levels compared with their female counterparts. Importantly, it was found that 78% of individual thoracic laminae, regardless of age or sex, could accept a 4.0-mm screw with 1.0 mm of clearance. As expected, when stratifying by age and sex, it was found that older male patients had the highest acceptance rates.

Conclusions

Data in the present study provide information regarding optimal TLS length, diameter, and trajectory for each thoracic spinal level in pediatric patients. Importantly, the data collected demonstrate no anatomical limitations within the pediatric thoracic spine to TLS instrumentation, although acceptance rates are lower for younger (< 8 years old) and/or female patients. Lastly, given the anatomical variation found in this study, CT scanning can be useful in the preoperative setting when planning TLS use in the thoracic spine of pediatric patients.
Arteriovenous malformation–associated aneurysms in the pediatric population
Authors: Anderson Richard C. E. , McDowell Michael M. , Kellner Christopher P. , Appelboom Geoffrey , Bruce Samuel S. , Kotchetkov Ivan S. , Haque Raqeeb , Feldstein Neil A. , Connolly E. Sander , Solomon Robert A. , Meyers Philip M. , Lavine Sean D.
Published: December 2011

Object

Conventional cerebral angiography and treatment for ruptured arteriovenous malformations (AVMs) in children are often performed in a delayed fashion. In adults, current literature suggests that AVM-associated aneurysms may be more likely to hemorrhage than isolated AVMs, which often leads to earlier angiography and endovascular treatment of associated aneurysms. The nature of AVM-associated aneurysms in the pediatric population is virtually unknown. In this report, the authors investigate the relationship of associated aneurysms in a large group of children with AVMs.

Methods

Seventy-seven pediatric patients (≤ 21 years old) with AVMs were treated at the Columbia University Medical Center between 1991 and 2010. Medical records and imaging studies were retrospectively reviewed, and associated aneurysms were classified as arterial, intranidal, or venous in location. Clinical presentation and outcome variables were compared between children with and without AVM-associated aneurysms.

Results

A total of 30 AVM-associated aneurysms were found in 22 children (29% incidence). Eleven were arterial, 9 intranidal, and 10 were venous in location. There was no significant difference in the rate of hemorrhage (p = 0.91) between children with isolated AVMs (35 of 55 [64%]) and children with AVM-associated aneurysms (13 of 22 [59%]). However, of the 11 children with AVM-associated aneurysms in an arterial location, 10 presented with hemorrhage (91%). An association with hemorrhage was significant in univariate analysis (p = 0.045) but not in multivariate analysis (p = 0.37).

Conclusions

Associated aneurysms are present in nearly a third of children with AVMs, and when arterially located, are more likely to present with hemorrhage. These data suggest that early angiography with endovascular treatment of arterial-based aneurysms in children with AVMs may be indicated.
Open reduction and internal fixation for angulated, unstable odontoid synchondrosis fractures in children: a safe alternative to halo fixation?
Authors: Fulkerson Daniel H. , Hwang Steven W. , Patel Akash J. , Jea Andrew
Published: December 2011

External orthosis is the accepted and historical management of odontoid synchondrosis fractures; however, this conservative therapy carries a significant complication and fracture nonunion rate among young children. The purpose of this study was to evaluate the authors' own experience in the context of the literature, to explore surgical fixation as a primary treatment for unstable fractures. The authors retrospectively reviewed 2 cases of unstable odontoid synchondrosis fractures treated at their institution; both showed radiographic progression of deformity and subsequently underwent an open surgical reduction and fusion. A literature review was conducted to compare the authors' management strategy with those in published data. External orthosis for treatment of odontoid synchondrosis fractures has a strong history of success. However, in the literature, patients treated with a halo orthosis had a 43.3% rate of complications and an 11.4% risk of nonunion. There are radiographic findings that suggest instability, such as severe angulation and displacement of the odontoid process. Both patients in the present report underwent successful fusion without complication, as documented on CT scans obtained 3 months after surgery. Given the high rate of fusion attained with conservative therapy, it is recommended for most synchondrosis fractures. However, there is a recognized subgroup of synchondrosis fractures with severe angulation (> 30°) and displacement suggestive of significant ligamentous injury. In these patients, surgical fixation may be a safe and efficacious alternative to halo orthosis as the primary treatment.
Giant intradiploic pseudomeningocele of occipital bone
Authors: Kumar Rajinder , Chandra Sarat P. , Sharma Bhawani Shanker
Published: December 2011

The management of intradiploic CSF collection is controversial. Although it is a benign lesion, even then delay in diagnosis and treatment may lead to significant morbidity. The authors report a very rare case of giant posttraumatic intradiploic pseudomeningocele involving the occipital bone, occipital condyles, and clivus. The pathogenesis and management of intradiploic CSF collection are discussed.

This 16-year-old boy presented with a history of enlarging swelling in the suboccipital region associated with headache, lower cranial nerve palsy, and features of high cervical compressive myelopathy. Investigations revealed a giant intradiploic lesion involving the occipital bone, condyles, and clivus associated with secondary basilar invagination, hydrocephalus, and syringomyelia. Intrathecal contrast administration did not reveal communication of intradiploic space with the subarachnoid space. A large occipital craniotomy was performed. A linear fracture and dural defect in the midline was identified, which was closed with fascial graft after removing the inner table of the skull. Cranioplasty was performed using the expanded calvarial bone. Ventriculoperitoneal shunt insertion was performed for hydrocephalus, and the patient improved remarkably.

Posttraumatic intradiploic CSF collection, although a benign condition, may present with severe complications if treatment is delayed. Early diagnosis and treatment is essential. The authors suggest that this condition should be treated early, as for growing skull fractures.
Improved Preservation of Saphenous Venous Conduits by the Use of Papaverine mixed heparinized blood Solution during Harvesting
Authors: Maruf MMF , Sabur SAMA , Akter T , Hakim E , Ahsan NAK
Published: January 2012

Background: High-pressure distension during harvesting damages the saphenous vein (SV) and may contribute to subsequent coronary artery bypass graft (CABG) occlusion. Application of vasodilator agents to the SV during harvesting may reduce the need for high-pressure distension and improve graft quality. We tested the effects of a vasodilator solution containing the conventional agent papaverine (Pap) mixed with heparinized blood on the pressure necessary to overcome SV spasm and on the structure. Methods: 150 patients undergoing CABG were nonrandomly allocated to receive an application of either intraluminal papaverine (Pap) mixed with heparinized blood(Group-A), or intraluminal heparin mixed normal saline(group-B) to the SV for distension during harvesting. The peak pressures required to distend the vein were recorded. Samples of SV were taken for microscopical analysis just before we performed the anastomosis. Results: The results for mean peak pressures (mm Hg) were: Normal saline 131.77±20.6 (range 85 to199 mmHg); and Papaverine mixed blood solution, 56.4±2.1 (range 40 to 90 mmHg); P<0.001, (Pap mixed blood solution versus normal saline); The results of histological study for endothelial injury were: Normal saline, 52.5 %; Papaverine mixed blood solution , 20%; (P<.02, untreated versus Pap mixed blood solution). Conclusions: Intraluminal use of Papaverine mixed heparinized blood solution during vein harvesting requires low distension pressure and improves endothelial coverage compared with the use of heparin mixed normal saline. Key Words: Venous Grafts; CABG; Papaverine DOI: http://dx.doi.org/10.3329/cardio.v4i1.9382 Cardiovasc. J. 2011; 4(1): 3-7
Prediction of the Site of Coronary Artery Lesion in Acute Inferior Myocardial Infarction with Right Sided Precordial Lead (V4r)
Authors: Alam MS , Ullah M , Ulabbi SU , Haque MM , Uddin R , Mamun MS , Majumder AAS
Published: January 2012

Background: The patient with inferior wall AMI, site of culprit lesions is an important determinant of outcome. Patient with RV infarction have a poor prognosis whereas those with occlusion of LCX have a good prognosis. Early diagnosis and treatment substantially reduce cardiac events particularly in high-risk patients. V4R can be used as to locate the site of obstruction. Materials and methods: 81 patients with acute inferior myocardial infarction admitted to the coronary care unit (CCU) within 12 hours after the onset of chest pain who underwent coronary angiogram were included in the study. Standard 12-lead ECG with right precordial lead V4R was recorded. Patients were categorized into within 3 groups according to early changes of V4R-Group- I - ST-segment elevation > 1 mm and positive T- wave, Group-II- ST-segment iso-electric and positive T-wave, Group-III- ST-segment depression >1 mm and negative T -wave. Results: In group I patients, highest percentage of the patients had lesion in proximal RCA (97.2%); whereas in group II patients, highest percentage in the distal RCA (89.7%) followed by LCX (41.4%) and in group III patients, highest percentage also in LCX (100.0%) followed by LAD (56.3%). Based on analysis of sensitivity and specificity, it was revealed that in group I patients of ECG finding suggested 100.0% sensitivity, 97.8% specificity and 98.8% accuracy. In group II patients, 92.9% sensitivity, 94.3% specificity and 93.8% had accuracy. In case of group III patients, 93.8% sensitivity, 98.5% specificity and 97.5% accuracy. Conclusion: The configuration of the ST-T segment in lead V4R is a sensitive and specific tool to recognize the occluded vessel in acute inferior MI whether it is proximal RCA, distal RCA or LCX. Since it is an inexpensive method, it can be readily used to locate the site of occlusion in AMI - Inferior. Keywords: Coronary artery disease; Myocardial infarction;, Lead V4r. DOI: http://dx.doi.org/10.3329/cardio.v4i1.9389 Cardiovasc. J. 2011; 4(1): 46-52
Profile of Young Acute Myocardial Infarction in Chittagong Medical College Hospital, Chittagong
Authors: Das PK , Ghafur S , Bhattarcharjee B , Dey A , Mollah AL , Kamal SMM , Murshed AKMM
Published: January 2012

Background: Coronary artery disease (CAD) is now an emerging epidemic in developing countries including Bangladesh. Younger people are being affected here more and more. Young individuals with acute myocardial infarction (AMI) may have unique presentation, risk factor, angiographic profile and outcome which may have an influence on the preventive strategies. This study is an attempt to investigate the same. Methods: Young patients (aged d” 40 yrs) with AMI admitted to the coronary care unit of Chittagong Medical College Hospital over a period of one year were included in the study. Assessments of the patients were done with clinical history, physical examination and systemic evaluation. Location and types (STEMI, NSTEMI) of myocardial infarction were determined by ECG and serum troponin- 1 assay. Blood for glucose and lipid profile was drawn within 24 hours of admission. High sensitivity testing for C-reactive protein (hs CRP) was done in all patients. Coronary angiography was done within 6 weeks of hospital discharge. Results: A total of 83 Patients with age d” 40 years were included .Age range were 21-40 years (34.21 ± 5.07 yrs). There were 71 male (85.5%). Male: female ratio was 5.9:1. Most of the young AMI patients presented lately to the hospital. Majority of these patients were thinly built, came from urban or semiurban areas, engaged in heavy physical activities and belonged to lower socioeconomic group. A positive family history of CAD was present in 18 patients (28.68 %). Smoking was the most prevalent risk factor followed by a raised serum triglyceride or low high density lipoprotein (HDL). A raised hs CRP was present in 47 patients (49.39%). The overall in hospital mortality was only 3.61 %. Coronary angiography done in 38 patients revealed single vessel disease in the majority. Conclusion: The study focuses our attention to the rising incidence of AMI in young individuals who are less prone to CAD. Early detection of AMI and timely intervention needs high index of suspicion in this age group. These young patients have got low BMI High TG, Low HDG High hs CRP & habit of smoking. Avoidance of smoking, controlling high TG and/or low HDL may reduce incidence of AMI among young patients. Use of high dose of statin at an early age in young persons with raised CRP may be considered. Keywords: Myocardial infarction; Young. DOI: http://dx.doi.org/10.3329/cardio.v4i1.9390 Cardiovasc. J. 2011; 4(1): 53-57
Coronary Angiographic Profile in Patients with Conduction System Disorder Requiring Permanent Cardiac Pacing
Authors: Majumder AAS , Ali MA , Rashid MTBA
Published: January 2012

Background: The association between conduction disturbances and atherosclerotic coronary artery disease has been investigated in a few small studies in the early 1970s and the study result was inconclusive. Thereafter some investigators found in their separate study that a group of patients with conduction disturbances that required permanent pacemaker who had coronary atherosclerotic disease that might be responsible for conduction disturbances. Method: 40 consecutive patients that required permanent pacemaker and 40 control patients were investigated. The coronary angiographic study was performed in both groups which included classification of pathological coronary anatomy, qualitative assessment of flow and stenosis severity. Results: The location of the lesions was found significantly different between two groups. 14 patients(35%) of 40 study patients had type IV lesion, whereas only 2 patients(5%) of 40 control patients had type IV lesion (p=0.001). Flow quality was found poor in more patients in study group specially that had type IV lesion. Severity of the lesions in the LAD & RCA was found identical in both groups. Conclusion: It may be concluded that the location of the lesions rather than diffuse coronary atherosclerosis might be responsible for a subset of patients with conduction disturbances that required permanent pacemaker. Key words: Conduction disturbances; Permanent pacemaker; Coronary angiogram; Type of coronary artery lesion. DOI: http://dx.doi.org/10.3329/cardio.v4i1.9392 Cardiovasc. J. 2011; 4(1): 61-66
Rare Case of Ruptured Sinus of Valsalva: Ruptured Into Left Ventricular Cavity
Authors: Taimur SDM , Khan SR , Karim MR , Rahman MH
Published: January 2012

Rupture sinus of Valsalva is a relatively rare condition. We report a rare case of ruptured left sinus of valsalva with aneurysm, presenting with acute left ventricular failure. Transthoracic echocardiography showed an aneurysmal dilatation of the base of interventricular septum and part of the aortic root and a marked turbulent flow from the aortic root to the left ventricle with a continuous systolodiastolic shunting. The patient underwent successful repair of ruptured sinus of valsulva with closure of fistula. During Ventriculotomy the defect was repaired using pledgeted 5/ 0 prolene interrupted sutures and pericardial patch. Key Words: Rupture sinus of valsalva; Aneurysm; Left ventricle DOI: http://dx.doi.org/10.3329/cardio.v4i1.9398 Cardiovasc. J. 2011; 4(1): 96-98
Nutraceutical Approach for Preventing Obesity-Related Colorectal and Liver Carcinogenesis
Authors: Shimizu Masahito , Kubota Masaya , Tanaka Takuji , Moriwaki Hisataka
Published: January 2012

Obesity and its related metabolic abnormalities, including insulin resistance, alterations in the insulin-like growth factor-1 (IGF-1)/IGF-1 receptor (IGF-1R) axis, and the state of chronic inflammation, increase the risk of colorectal cancer (CRC) and hepatocellular carcinoma (HCC). However, these findings also indicate that the metabolic disorders caused by obesity might be effective targets to prevent the development of CRC and HCC in obese individuals. Green tea catechins (GTCs) possess anticancer and chemopreventive properties against cancer in various organs, including the colorectum and liver. GTCs have also been known to exert anti-obesity, antidiabetic, and anti-inflammatory effects, indicating that GTCs might be useful for the prevention of obesity-associated colorectal and liver carcinogenesis. Further, branched-chain amino acids (BCAA), which improve protein malnutrition and prevent progressive hepatic failure in patients with chronic liver diseases, might be also effective for the suppression of obesity-related carcinogenesis because oral supplementation with BCAA reduces the risk of HCC in obese cirrhotic patients. BCAA shows these beneficial effects because they can improve insulin resistance. Here, we review the detailed relationship between metabolic abnormalities and the development of CRC and HCC. We also review evidence, especially that based on our basic and clinical research using GTCs and BCAA, which indicates that targeting metabolic abnormalities by either pharmaceutical or nutritional intervention may be an effective strategy to prevent the development of CRC and HCC in obese individuals.
Neuroprotective Effects of Exogenous Activin A on Oxygen-Glucose Deprivation in PC12 Cells
Authors: He Jin-Ting , Mang Jing , Mei Chun-Li , Yang Le , Wang Jiao-Qi , Xing Ying , Yang Hong , Xu Zhong-Xin
Published: December 2011

Ischemic cerebrovascular disease is one of the most common causes of death in the World. Exogenous activin A (ActA) protects neurons against toxicity and plays a central role in regulating the brain’s response to injury. In the present study, we investigated the mechanisms involved in the neuroprotective effects of ActA in a model of hypoxic-ischemic brain disease. We found that ActA could effectively increase the survival rate of PC12 cells and relieve oxygen-glucose deprivation (OGD) damage. To clarify the neuroprotective mechanisms of ActA, the effects of ActA on the ActA/Smad pathway and on the up-regulation of inducible nitric oxide synthase (NOS) and superoxide dismutase (SOD) were investigated using OGD in PC12 cells. The results showed that ActA could increase the expression of activin receptor IIA (ActRIIA), Smad3 and Smad4 and that 50 ng/mL and 100 ng/mL of ActA could reduce NO levels and increase SOD activity by 78.9% and 79.9%, respectively. These results suggested that the neuroprotective effects of ActA in ischemia could be related to the activation of the ActA/Smad signaling pathway and to its anti-oxidant activities.
Enzyme Treatment-Free and Ligation-Independent Cloning Using Caged Primers in Polymerase Chain Reactions
Authors: Kuzuya Akinori , Tanaka Keita , Katada Hitoshi , Komiyama Makoto
Published: December 2011

A new simple scheme for constructing recombinant vectors that does not require any restriction enzyme, ligase, or any other special enzyme treatment has been developed. By using caged primers in PCR, unnatural sticky-ends of any sequence, which are sufficiently long for ligation-independent cloning (LIC), are directly prepared on the product after a brief UVA irradiation. Target genes and vectors amplified by this light-assisted cohesive-ending (LACE) PCR join together in the desired arrangement in a simple mixture of them, tightly enough to be repaired and ligated in competent cells.
Potential Use of Polyamidoamine Dendrimer Conjugates with Cyclodextrins as Novel Carriers for siRNA
Authors: Arima Hidetoshi , Motoyama Keiichi , Higashi Taishi
Published: December 2011

Cyclodextrin (CyD)-based nanoparticles and polyamidoamine (PAMAM) starburst dendrimers (dendrimers) are used as novel carriers for DNA and RNA. Recently, small interfering RNA (siRNA) complex with β-CyD-containing polycations (CDP) having adamantine-PEG or adamantine-PEG-transferrin underwent a phase I study for treatment of solid tumors. Multifunctional dendrimers can be used for a wide range of biomedical applications, including the interaction and intracellular delivery of DNA and RNA. The present review will address the latest developments in dendrimer conjugates with cyclodextrins for siRNA delivery including the novel sustained release system.
Analysis of Intensity and Vibration of 190T Electric Wheel Dump Truck Frame
Authors: Yu Xiao Guang , Yang L.
Published: January 2012

Through the cracking failure analysis of dump truck frame with large electric wheel, the static and dynamic frame analysis of performance evaluation are conducted by the finite element analysis method. From the strength and stiffness analysis frame structure in the weak links, it is easy to find out crack the parts and the reasons with frame, and through the modal analysis and random vibration and fatigue strength analysis the danger frequency of the frame induced by road encourage is obtained, which can prevent the occurrence of frame cracks and provide a foundation for further optimization of the frame.
Removal of Ocular Artifact from EEG Using Constrained ICA
Authors: Huang Lu , Wang Hong , Wang Yu
Published: January 2012

Ocular artifacts are the most important form of interferences in EEG signals. Before analyzed, EEG signals should be pretreated by removal of ocular artifacts. CICA is an excellent approach to separate the desired source signals. But, the choice of reference signals is crucial. In this paper, we adopted CICA to separate ocular artifact from EEG, using a different method from Lu to build the reference signals, which can avoid the subjectivity during the operation. It was proved to be effective.
Simulation and Study on Non-Sinusoidal Oscillation Control System of Continuous Casting Mold
Authors: Zhang Xiao Jun
Published: January 2012

The paper describes the composition and working principle of the mold oscillation control system. The mathematical model of hydraulic servo control system is established. The total system transfer function is established by MATLAB program. By using the SIMULINK module, we determined various components’ parameter values. We got different simulation curves and Bode plots by inputting non- sinusoidal function and carrying out the dynamic simulation to the mold oscillation mathematical model, we also analyzed stability of the whole system to verify the accuracy of system design.
Modal Analysis of Temporarily Installed Suspended Access Equipment Based on ANSYS
Authors: Zheng Xi Jian , Lu Zhen , Zhao Xiang Yun , Gao Xing Liang
Published: January 2012

The paper chooses ZLP800 temporarily installed suspended access equipment (TISAE) as a object of study, it is based on theory of structural model analysis. The finite element model has been established by the finite element method (FEM). The model is analyzed by the modal analysis module of ANSYS, the first four natural frequencies and corresponding modal shapes are extracted in this paper, the cause of every modal shapes are analyzed in the paper. In order to get a more rational constraint mode, the natural frequency under different constraint condition is calculated. Then the external excitation factors, such as the vibration frequency of the electrical machine in a hoister, swing of suspended platform and the friction disk in a hoister are calculated respectively, finding the external excitation factors which would cause a sympathetic vibration, and giving the suggestions for averting the sympathetic vibration, providing some academic reference to improve and perfect the structure design of the TISAE products.
Output Feedback Control of a Ball and Beam System Based on Jacobian Linearization under Sensor Noise
Authors: Kim Hyun Do , Oh Kyung Hyun , Choi Ho Lim
Published: January 2012

In this paper, we consider a control problem of a ball and beam system with sensor noise on feedback sensor. If sensor noise exists in sensor's signal, it can make feedback signals deformed and then it can lead to control performance degradation or even system failure. Therefore, we need to design a robust controller to deal with the possible sensor noise in the feedback information. We develop an output feedback controller with a gain-scaling factor in order to minimize the effect of AC sensor noise in output feedback information. Our proposed controller is applied to a ball and beam system and verified by analysis and simulation. As a result, our controller reduces the effect of sensor noise to arbitrarily small by increasing a gain-scaling factor.
Study on the Temperature Field of Casting Process in ANSYS
Authors: Li Chang , Zhao Guang Bing , Zhang Shu Yu , Han Xing
Published: January 2012

Cast molding is the main manufacture process in foundry, because the most disfigurements occurs in this step, while the foundry itself is a complex non-linear instantaneous transferring heat process, in which it should take the absorbing and releasing potential heat into account. In this paper, it simulates the temperature field changing process of the cast solidification in ANSYS software, gets the temperature field change rule for a typical cast, and analyzed the effect of different foundry technics parameters on composite interface temperature, which will provide numerical bases for optimizing foundry technics parameters in future.
Free Axial Vibrations of Non-Uniform Rods
Authors: Guo Shu Qi , Yang Shao Pu
Published: January 2012

Free axial vibrations of non-uniform rods are investigated by a proposed method, which results in a series solution. In a special case, with the proposed method an exact solution with a concise form can be obtained, which imply four types of proﬁles with variation in geometry or material properties. However, the WKB (Wentzel-Kramers-Brillouin) method leads to a series solution, which is a Taylor expansion of the results of the pro-posed method. For the arbitrary non-uniform rods, the comparison indicates that the WKB method is simpler, but the convergent speed of the series solution resulting from the proposed method is faster than that of the WKB method, which is also validated numerically using an exact solution of a kind of non-uniform rods with Kummer functions.
Reformation Design of the Feeding System of the Semi-Mobile Crushing Station
Authors: Wang Xin Yu , Yu Xiao Guang
Published: January 2012

The crusher station of the Qi Dashan mine is the semi-mobile crushing station. The crusher station has three parts. They are a heavy plate type material feeder having a receptacle trough, a crusher having a tower for controlling and a blowdown equipment. The hazard rate of the heavy plate type material feeder having a receptacle trough is hign and it operating cost is costly. So the heavy plate type material feeder having a receptacle trough will be thrown off. A new feeding system will take the place of it. And new steel structure beams will be designed. The weight of the new feeding system will be born by the steel structure beams. The ore or rock will be pured into the crusher directly.
Correlating Piezoelectric Polymer/Carbon Nanotubes Nanocomposite Strain Sensor with Reliability and Optimization Tools
Authors: El-Hami Khalil , El Hami Abdelkhalak
Published: January 2012

Carbon nanotubes with polymers offers great advantages in improving material for both mechanical and electrical nanostructures. Design and fabrication have to consider that a local change in each compound accounts to the total change of physical properties in nanocomposite materials. This paper presents two parts of study. A model of strain nanosensor has been developed by using the polyvinylidne fluoride and trifluoroethylene P(VDF-TrFE) copolymer and carbon nanotubes in sandwich nanostructure [P(VDF-TrFE)/SWCNTs/ P(VDF-TrFE)] as a new application in nanotechnology domain. The experimental strain sensing was about 10-4. On the other hand, reliability-based optimization is assessed for an efficient tool to consider this nanosensors nanodevice. We put emphasis on the combination of physical modeling and reliability based design optimization of nanomaterials. After investigation, we could make suggestions such as how to improve the reliability of nanodevices and nanosystems, and how to reduce cost and economic rates.
Risk Assessment of Subsea X-Tree System
Authors: Wang Chang Yong , Zhang Hong Huan , Duan Meng Lan
Published: January 2012

That the oil and gas exploration and development is extending into deep water proceeds the rapidly shift to subsea production system. However, complex subsea equipment and frequency offshore accidents aroused the concern on the risk assessment of subsea system. The paper illustrates the hazard aspects which should be focused on in the subsea equipment compared with the surface equipment. The hazards identification and risk analysis on subsea X-tree system is carried out. A general risk-prevent process of subsea X-tree system is illustrated, so does the reliability analysis process. Besides, some commendations on subsea detection and maintenance are presented in the paper.
The Effect of Sulfuration on Wear Behavior of NBR under Water Lubricating Sliding
Authors: Lv Xiao Ren , Wang Shi Jie , Han Heng
Published: January 2012

Surface modification treatment on rubber used in lubricating environment can reduce the friction coefficient, friction temperature and wear loss, thereby increase the service life of rubber products. The effect of Sulfuration treatment on wear behavior of NBR was investigated using a reciprocating tester under water lubricating sliding. The hardness and morphology of samples were measured using Shore sclerometer and stereo microscope, respectively. The results showed that immersion loss of rubber in different sulfuration solution increased with immersion time. The immersion loss of rubber immersed in 60% and 70% sulfuration solution remarkably increased after immersing for 4 and 3 days, respectively. The Shore hardness of rubber immersed in sulfuration solution was higher than that untreated sample. The Shore hardness of rubber increased with the increasement of sulfuration concentration and immersing time. Better resistance of NBR in water lubricating sliding could be obtained when NBR is immersed in lower sulfuration solution for longer time or in high sulfuration solution for shorter time.
Design and Testing of Experiment Platform for Urban Rail Vehicle Vibration
Authors: Feng Qing Sheng , Li Hong
Published: January 2012

The rail irregularity and other factors often cause vehicle vertical vibration when the vehicle is running. When the vibration intensity reaches a certain limit, the passenger in the vehicle will feel very uncomfortable. The excessive vibration will also affect the service life of the vehicle and operation stability. So the good cushioning and vibration isolation performance are need to people when the vehicle is running. A vibration experiment test system is designed according to the urban rail vehicle characteristics and the vehicle vibration characteristics during running. The parameters can becalculated and the 1Hz to 3Hz square and sine wave vibration characteristics test can be completed in the system. Using the system we can evaluate the vehicle vibration characteristics and ride comfort better .So the test results have a certain value.
Strength Calculation Analysis of Diesel Engine Linkage Based on Three-Dimensional Contact Finite Element Method
Authors: Wang Gui Xin , Li Xiao Bo , Guo Li Jun , Ma Jun Yan
Published: January 2012

Adopting a three-dimensional contact finite element method, with complex connecting rod group assembled body model of computation, the fatigue strength of the connecting rod of a certain type of diesel engine was verified. A transient stress analysis was conducted on the connecting rod. Compared with the connecting rod static stretching and compression test, the three-dimensional contact finite element method, which was used to analyze the strength of the connecting rod subassembly, was feasible. Based on the three-dimensional contact finite element method, the connecting rod transient stress analysis results showed that the maximum stress of the connecting rod did not occur under the highest pressure of the cylinder, and the dynamic stress value was less than the static stress value.
Macroscopy Lattice Deformation of Martensitic Transformation in Fe-Based Shape Memory Alloy
Authors: Lin Xiao Ping , Dong Yun , Yang Lian Wei
Published: January 2012

Macroscopic lattice deformation of martensitic transformation and shape memory effect (SME) were studied by atom force microscopy (AFM), X-ray diffraction and so on. The results showed that stress induced martensitic surface relief was “N”-shaped. The surface relief was parallel distribution when deformation was less than 6%. When relief became to intercross, its height and width were far less than parallel relief in same deformation. Superior heat-recovery was discovered in parallel surface relief. The recovery ratio was very low in intercrossed relief. The macroscopic lattice deformation descends in virtue of relief intercrossed, then recovery process was forbidden, so that recovery ratio was descent.
Research of LiMnPO4/C Synthesized by Solid-State Reaction with Different Carbon Sources
Authors: Liu Xue Wu , Li Xin , Liu Gui Chang , Chen Shen , Chen Guo Hua
Published: January 2012

The carbon-containing LiMnPO4 compounds were prepared by solid-state reaction with different carbon source: carbon black, citric acid, sucrose, or resorcinol formaldehyde resin. The structure, surface morphology and electrochemical performance of LiMnPO4 were characterized by X-ray diffractometry, scanning electron microscopy and electrochemical measurement respectively. The AC impedance and Cyclic Voltammetry was also discussed. The results showed that the electrochemical performance of LiMnPO4/C was affected by different carbon source. The particle size of LiMnPO4/C using resorcinol formaldehyde resin as carbon source was about 100~300 nm. The initial discharge capacity is 121.6mAh/g at 0.02C and an overall reversible capacity of 110mAh/g has been retained after 20 cycles. While at 0.1C, the discharge capacity was 110mAh/g; and more than 60mAh/g at 1C.
Research on the Evaluation Method of Energy-Saving Technology about Traffic and Transportation
Authors: Li Xiao , Liu Li , Li Qiang
Published: January 2012

The energy-saving technology of the transport is still in its infancy. It has some questions about the evaluation and the promotion. Which lead to excellent energy-saving technology turn into productive forces can not be timely. In this case. The paper establishes the energy-saving technology evaluation index system by the Delphi; and calculated the evaluation index weights of each factor by the AHP. Finally, the paper proposed the evaluation method of the energy-saving technology which based on fuzzy comprehensive evaluation.
Effect of Incremental Copper Powders Third Body on Friction Properties of Q235 Steel
Authors: Liu Hua Li , Gao Fei , Nong Wan Hua , Fu Rong
Published: January 2012

To understand the effects of the third body of copper in the copper-based composite materials on the friction properties, the effect of copper powders on the friction properties of Q235 steel is studied by using the pin-on-disk tester and adding copper powders third body. The results show that when the friction speed at 500-3000 r/min, due to the incremental copper powders, the depth of the furrows on the friction surface was reduced and the adhesion and spalling process of surface third body were intensified, which results that the frictional coefficients of the Q235 steel are increased 0.2-0.35 comparing with that of without adding copper powders. The reason is that incremental copper third body plays the role of increasing the meshing of the asperity and the actual friction area.
Linear Parameter-Varying Modeling of Electric Vehicle Air Conditioning System
Authors: Wang Xiao Ming , Steiner Alois , Fiala Jan
Published: January 2012

This article presents the approach of quasi LPV (Linear Parameter-Varying) modeling techniques for an air conditioning system of an electric vehicle. Vehicle air conditioning systems are strongly non-linear systems and it is a challenging task to get a precise real time model for control purposes. Therefore, an LPV method is first introduced to estimate the air conditioning system. Experimental results show that the LPV model delivers a very high accuracy for the COP (Coefficient Of Performance) estimation, that can’t be reached by traditional identification methods. Some discussion about the model structure and its application are presented and a non-linear LPV model structure similar to the Hammerstein structure is proposed.
Experimental Study on Desulfurization of Fly Ash Slurry
Authors: Liao Yong Jin , Zhai Ming , Li Fang Yong , Shi Wei Qiang , Zhang Yu , Dong Peng
Published: January 2012

This paper designs a bubbling type of desulfurization reactor, which simulates flue gas nitrogen and sulfur dioxide according to a certain flow ratio, equipped with absorber through into the bubbling type desulfurization absorb and reactor by iodine volume method, measures import and export of SO2 concentration and pH value of absorber. The desulfurization rate of fly ash slurry is measured in the small drum bubble desulfurization reactor device. Results show that increasing the concentration of fly ash and entrance SO2 concentration, and decreasing particle size of fly ash will increase the desulfurization rate of fly ash slurry. The main mechanisms of fly ash desulfurization are physical adsorption and chemical adsorption.
Preparation of Ultra-Fine Powder Using Supercritical Fluids: A Review
Authors: Hu De Dong , Wang Wei Qiang , Zhao Zhi Quan , Zhang Gui Min , Bai Wen Qin , Zhuang Jian Bin , Ding Ming Lei
Published: January 2012

The size of ultrafine particles ranges between 1~1000nm, including metal, non-metallic, organic, inorganic and biological powder materials. Because of its inherent surface effect, small size effect and quantum effect, it has special optical properties, thermal properties, magnetic properties and mechanical properties which had been widely used in various industrial fields. Supercritical fluid technology has been used to obtain ultra-fine powder of several kind of materials. This work is focused on the systematic production of ultra-fine powder using RESS and SAS process. A systematic summary is made and different measures adopted according to the related circumstances are presented. We also summarize the effect of the process parameters of RESS and SAS process. The ongoing and more extensive research on mechanism and control measures of size, morphology and size distribution of particle should provide a better understanding of particle formation mechanism and achieve the goal of integrated use of different measures to control particle preparation process in the near future.
The Research on the Friction and Wear Properties of Carbon Fiber Reinforced Polyamide 6 Composites
Authors: Cai Zhi Yong , Wang Wen Xia
Published: January 2012

The effects of Carbon fiber content and wear condition on the tribological properties of the composites were measured using a block on ring wear tester. The worn surface was investigated with a scanning electronic microscope and the wear mechanism was proposed. It was found that Carbon fiber improved the wear resistance of monomer casting polyamide 6 with the optimal content of Carbon being approximately 5 vol.%. The wear of PA6/Carbon fiber composite was lower than that of the PA6 and increased slowly while its friction coefficient decreased gradually with load. However, the friction coefficient of the composite was somewhat larger than that of monomer casting polyamide 6.
A Multi-Disciplinary Simulation Framework Based on Semantic-SOA
Authors: Song Xiao , Zhang Lin , Lai Li Yuan Jun , Qian Li Dong
Published: January 2012

Semantic-SOA is becoming a key enabler for multi-disciplinary collaborative simulation and environment for supporting automatic integrated development. For meeting the challenges of Semantic-SOA applications in continuous/discrete systems and dynamic interoperation, we proposed a framework for developing flexible collaboration. In this paper, we present a DDL (Dynamic Description Logic) based framework to improving the existing Semantic-SOA. The extension of OWL-S with DDL allows us to implement clear representation of dynamic information and simulation activities. Furthermore, some new definitions of DDL are proposed to fit our simulation systems. In the end, a demo system is implemented.
Complex Equipment Failure Prediction Technology Based on Virtual Environment
Authors: Huang Jing De
Published: January 2012

Complex equipment used in the process, due to changes in running load, vibration, shock and other incidental factors and other confounding factors can lead to changes in equipment and technology status, fault diagnosis of the current state of change brought about by these technologies use is not enough information, relying solely on traditional sensor technology can not test some special devices for signal extraction and data acquisition features. Therefore, the establishment of complex equipment and more operating conditions of knowledge acquisition simulation environment, considering the failure of complex equipment failure caused by the internal laws and mechanisms, to the essence of the phenomenon of failure analysis, combined with the physical prototype test results and raw statistical data, research the actual process of using complex equipment, considering the state of properties, condition monitoring parameters and the integration of traditional knowledge, expertise and reasoning techniques to be applied to physical prototype of a certain conclusion, not only for the early prediction of potential failures, laid the theoretical foundation for forecasting , and fault prediction system for the complex equipment, the development provides important data and technical support to solve the complex equipment maintenance and support tasks needed problem.
Design and Research of Sewing Tube Packing Device Based on Pneumatic
Authors: He Yang , Xiu Shu Dong
Published: January 2012

Through analysing technology and principle of sewing thread tube packing, a kind of sewing thread tube packing device was designed, and the mechanical, pneumatic and control system were designed. Using the device, the result of the Packaging tests verified all sorts of function. It has a positive meaning to improve the production efficiency in Textile enterprise.
Bearing Fault Diagnosis Based on Wavelet Transform and ICA
Authors: Wu Qiang , He Qing Bo , Kong Fan Rang , Liu Yong Bin , Li Peng
Published: January 2012

The key to fault diagnosis of rolling element bearing is how to find typical characteristic frequencies from low SNR mixed signals. Jointing Continuous Wavelet Transform (CWT) with Independent Component Analysis (ICA)，this paper proposes a method to select wavelet scales with iso-interval frequency and analyze envelope spectrum of independent signal to diagnose the fault of rolling element bearing. Finally, the effectiveness of this method has been verified by practical signal of rolling element bearing.