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Experimental and finite element analysis on determining the fatigue life of pb-free solder joint(sn-0.5Cu-3Bi-1Ag)used in electronic packages under harmonic loads

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International Journal of Modeling, simulation, and scientific Computing 2020年第3期11卷 60-67页

作者： jayesh s Jacob Elias Department of Mechanical Engineering school of Engineering Cochin University of Science and Technology KochiKerala-682022India

Electronic packages that are used these days are exposed to different types of vibration loadings in their usage *** vibration exposure can be categorized as harmonic and random *** reliability assessment of modern electronic systems is considered,vibration loading has an important role to *** of the biggest challenges facing today is the accurate and rapid assessment of fatigue life under the vibration *** solder joints were made of lead-tin *** to many environment legislations and rules,lead is prohibited as an ingredient in the solder *** reason for the prohibition of the usage of the lead is that it poisons the *** this study,sn-0.5Cu-3Bi-1Ag is used as the lead-free solder *** life prediction of electronic package containing sAC405 is conducted with the aid of vibration testing and Finite element analysis under harmonic vibration loading.A specially designed Plastic Ball Grid Array Package(PBGA)component is mounted on Printed Circuit Board(PCB).It is taken as a test vehicle for the vibration *** test vehicle is excited by a sinusoidal *** frequency of this excitation equals the fundamental frequency of the test vehicle and it is continued till the component *** the solder balls are very small for direct measurement,Finite Element analysis(FEA)is used for noting down the *** stress versus failures cycles(s-N)curve is made by relating both the stresses on the solder balls obtained and the number of failure cycles from vibration *** fatigue life of the component can be estimated from the generated s-N *** is analyzed that the methodology is effective in predicting the component’s ***,the reliability of electronic package can be improved.

关键词： PCB lead free solder joint FEA PBGA s-N curve

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A case of type Ⅰ variant Kounis syndrome with samter-Beer triad

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World Journal of Cardiology 2013年第4期5卷 112-114页

作者： jayesh s Prajapati Kapil M Virpariya Ashok s Thakkar Atul D Abhyankar Department of Cardiology UN Mehta Institute of Cardiology and Research CenterAhmedabad 380016GujaratIndia Department of Clinical Trials Sahajanand Medical Technologies Pvt.Ltd.Surat 395004India Department of Cardiology Shree BD Mehta Mahavir Heart InstituteAthwagateSurat 395001India

Kounis syndrome is defined as the coexistence of acute coronary syndromes with situations associated with allergy or hypersensitivity,as well as anaphylactic or anaphylactoid reactions,to a variety of medical conditions,environmental and medication *** report a case of Kounis-Zavras syndrome type Ⅰ variant in the setting of aspirin-induced asthma,or the samter-Beer triad of asthma,nasal polyps and aspirin *** there is a young individual with no predisposing factors of atherosclerosis and apparent coronary lesion,with or without electrocardiography and biochemical markers of infarction,the possibility of Kounis syndrome should be kept in mind.

关键词： Kounis syndrome samter-Beer triad Nasal polyps Coronary spasm Aspirin allergy

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Clinical Performance of the Cobalt-Chromium Biodegradable Polymer Coated sirolimus-Eluting stent in an Unselected Real-World Population

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International Journal of Clinical Medicine 2014年第5期5卷 206-215页

作者： Prakash Chandwani Atul D. Abhyankar jayesh s. Prajapati sanjay C. Porwal Ashok s. Thakkar Apollo Hospitals International Limited Gandhinagar India Heart and General Hospital Jaipur India KLEs Dr. PrabhakarKore Hospital & Medical Research Centre Belgaum India sahajanand Medical Tech. Pvt. Ltd. Surat India shree B.D. Mehta Mahavir Heart Institute Surat India

OBJECTIVE: The primary objective of the s-CORE registry was to assess the safety and efficacy of the supralimus-Core? sirolimus-eluting stent deployment for the treatment of coronary artery disease and event-free survival of patients treated with this coronary stent. METHODs: s-CORE Registry is an observational, single-arm, non-randomized, post-marketing surveillance multicenter registry in which 562 patients undergoing single or multi-vessel percutaneous coronary intervention were enrolled. The pre-specified primary outcome was the rate of major adverse cardiac events (MACE), defined as the composite of cardiac death, myocardial infarction (MI), target lesion revascularisation (TLR) and target vessel revascularisation (TVR) at 12-month post-procedure. stent thrombosis (sT) served as the safety endpoint. REsULTs: A total of 640 lesions were treated in 562 enrolled patients (mean age 57.4 ± 10.7 years) with average stent length of 25.0 ± 9.0 mm. stent delivery was successful in 99% cases. A total of 554 (98.6%) patients have been followed up to 12 months. The incidence of MACE at 30 days and 6 months was 7 (1.2%) and 12 (2.1%) respectively. The composite rate of MACE at a 12-month clinical follow-up was 19 (3.4%), consisting of 12 (2.1%) cardiac deaths, 0 (0%) MI, 6 (1.1%) TLR and 1 (0.2%) TVR. The long-term follow-up of this registry is going on to confirm safety and efficacy profiles. CONCLUsIONs: This multicenter registry demonstrated satisfactory safety and efficacy profiles, as evidenced by low rates of major adverse cardiac events up to 12 months, for the cobalt-chromium biodegradable polymer-based sirolimus-eluting supralimus-Core? stent in a “real-world” setting.

关键词： Coronary Artery Disease Biodegradable Polymer sirolimus-Eluting stent

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Response of blood pressure after percutaneous transluminal renal artery angioplasty and stenting

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World Journal of Cardiology 2013年第7期5卷 247-253页

作者： jayesh s Prajapati sharad R Jain Hasit Joshi shaurin shah Kamal sharma sibasis sahoo Kapil Virparia Ashok Thakkar Department of Cardiology UN Mehta Institute of Cardiology and Research CentreAhmedabad 380016GujaratIndia senior Clinical Trial Manager SahajanandMedical Tech. Pvt. Ltd.Surat 385004India

AIM: To evaluate the short and intermediate term out-come of percutaneous transluminal renal artery angioplasty (PTRA) and stenting particularly on blood pressure (BP) control and renal function and to evaluate predictors of poor BP response after successful PTRA and stenting. METHODs: We conducted a prospective analysis of all patients who underwent PTRA and stenting in our institute between August 2010 to september 2012. A total number of 86 patients were underwent PTRA and renal stenting. selective angiography was done to confirm at least 70% angiographic stenosis. The predilatation done except few cases with critical stenosis, direct stenting was done in the rest of cases. All patients received aspirin 325 mg orally, and clopidogrel 300 mg orally within 24 h before the procedure. Heparin was used as the procedural anticoagulant agent. Optimal results with TIMI-Ⅲ flow obtained in all cases. Following stent placement, aspirin 150 mg orally once daily was continued for a minimum of 12 mo and clopidogrel 75 mg orally once daily for at least 4 wk. The clinical, radiological, electrocardiography, echocardiography and treatment data of all patients were recorded. The BP measurement, serum creatinine and glomerular filtration rate (GFR) were recorded before the procedure and 1 and 6 mo after PTRA. REsULTs: A total of 86 patients were included in the study. The mean age of study population was 55.87±11.85 years old and 67 (77.9%) of patients were male. There was a significant reduction in both systolic and diastolic BP at 1 mo after the procedure: 170.15±20.10 mmHg vs 146.60±17.32 mmHg and 98.38±10.55 mmHg vs 89.88±9.22 mmHg respectively (P=0.0000). The reduction in BP was constant throughout the follow-up period and was evident 6 mo after the procedure: 144.23±18.19 and 88.26±9.79 mmHg respectively (P=0.0000). However, no improvement in renal function was observed at any time during the follow-up period. After multivariate analysis, we found male sex, low GFR (<60 mL/mi

关键词： Percutaneous transluminal renal artery angioplasty Hypertension Glomerular filtration rate Renovascular hypertension Renal stent

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Clinical spectrum of Infective Endocarditis in a Tertiary Care Centre in Western India: A Prospective study

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International Journal of Clinical Medicine 2014年第5期5卷 177-187页

作者： sharad R. Jain jayesh s. Prajapati Manjunath A. Phasalkar Bhavesh H. Roy Ashwal A. Jayram shaurinkumar R. shah Tarandeep singh Ashok s. Thakkar Department of Cardiology U. N. Mehta Institute of Cardiology and Research Centre Ahmedabad India Department of Clinical Trials Sahajanand Medical Tech. Pvt. Ltd. Surat India

OBJECTIVEs: We examined the microbiological spectrum, clinical profile, echocardiographic features and in-hospital outcomes of patients with definitive IE. METHODs: A total of 75 consecutive cases of definitive infective endocarditis (IE), admitted between January 2011 and January 2013, were included in the study. This was a prospective study enrolling all the consecutive definitive cases of IE admitted at U. N. Mehta Institute of Cardiology and Research Centre (UNMICRC), Ahmedabad, India. Only the patients who met the modified Duke’s definitive criteria for IE were included in the study. We compared enrolled patients clinicoepidemiologic features and outcomes to subjects in the west. REsULTs: The mean age was 27.46 ± 17.11 years with a male preponderance (2.26:1). The rheumatic heart disease (41.3%) was the commonest underlying disease followed by coronary heart disease (34.7%). The blood culture was positive in 40% of episodes with commonest organisms being staphylococci (16%) and streptococci (12%). Complications were cardiovascular in 40 (53.3%) cases (congestive heart failure in 42.7%, atrioventricular block in 6.7%), septic shock in 20 (26.7%), neurological in 23 (30.7%) (cerebrovascular stroke in 20%, central nervous system hemorrhage in 5.3%, encephalopathy in 5.3%) and renal failure in 20 (26.7%) of cases respectively. Only 12 (16%) patients underwent surgery for IE. The total in hospital mortality rate was 22 (29.3%). On multivariate analysis, congestive heart failure, renal failure, neurological abnormalities, age 20 years and septic shock were independent predictors of mortality. CONCLUsIONs: The spectrum of infective endocarditis is different in Indian population compared to the west and carries a substantial morbidity and mortality. The rheumatic heart disease is still the commonest underlying heart disease in our population. The culture positivity rates and surgery for infective endocarditis are unacceptably low. Early cardiac surgery may help to impr

关键词： Infective Endocarditis Rheumatic Heart Disease Echocardiography

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strategically designing layered two-dimensional sns_(2)-based hybrid electrodes: A futuristic option for low-cost supercapacitors

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Journal of Energy Chemistry 2023年第10期85卷 394-417,I0011页

作者： susmi Anna Thomas jayesh Cherusseri Centre for Advanced Functional Materials(CAFM) Department of PhysicsBishop Moore CollegeMavelikaraKerala 690110India sunway Centre for Electrochemical Energy and sustainable Technology(sCEEsT) School of Engineering and TechnologySunway UniversityNo.5 Jalan UniversityBandar SunwayPetaling Jaya 47500Malaysia

supercapacitors are promising energy storage devices in current century due to their high specific capacitance, cyclic stability, high power density, and high voltage rating. Due to their excellent electrochemical properties, supercapacitors are invariably used in a multitude of applications ranging from portable electronics to electric vehicles. The electrochemical performance of a supercapacitor mainly depends on the type of electrode-active material used in it. Thereby a careful selection is mandatory to achieve the excellency. Nanostructured electrode-active materials such as carbon nanomaterials, transition metal oxides,transition metal dichalcogenides(TMDs), electronically conducting polymers, etc. are invariably used for supercapacitor application. Among these, TMDs have received great interest, particularly transition metal disulfides such as molybdenum disulfide, tin disulfide(sns_(2)), etc. Tin is abundant on the earth with excellent charge storage capabilities, attracted great scientific interest for application as electrode materials in supercapacitors. Good electronic conductivity, long cycling life and low-cost are its added ***, we discuss the recent trends in layered two-dimensional(2D) sns_(2)-based electrodes to develop low-cost supercapacitors. Initially, their crystal structure, basic properties, synthesis methods are discussed. Further, strategically designing electrode nanostructures to achieve excellent electrochemical performance is reviewed then after. This includes material design in terms of morphology, pore-size,and shape as well as preparation of 2D sns_(2)-based nanocomposite electrodes. Furthermore, the challenges and future perspectives of 2D sns_(2)-based supercapacitors are included.

关键词： sns_(2) supercapacitor Transition metal dichalcogenides Electrochemical energy storage

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single-step Arbitrary Lagrangian-Eulerian Discontinuous Galerkin Method for 1-D Euler Equations

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Communications on Applied Mathematics and Computation 2020年第4期2卷 541-579页

作者： jayesh Badwaik Praveen Chandrashekar Christian Klingenberg Department of Mathematics University of WürzburgWürzburgGermany TIFR Center for Applicable Mathematics BangaloreIndia

We propose an explicit,single-step discontinuous Galerkin method on moving grids using the arbitrary Lagrangian-Eulerian approach for one-dimensional Euler *** grid is moved with the local fluid velocity modified by some smoothing,which is found to con-siderably reduce the numerical dissipation introduced by Riemann *** scheme preserves constant states for any mesh motion and we also study its positivity preservation *** grid refinement and coarsening are performed to maintain the mesh qual-ity and avoid the appearance of very small or large ***,higher order methods are developed and several test cases are provided to demonstrate the accuracy of the proposed scheme.

关键词： Discontinuous Galerkin method Moving meshes Arbitrary Lagrangian-Eulerian Euler equations

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Current guidelines in the surgical management of hereditary colorectal cancers

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World Journal of Gastrointestinal Oncology 2022年第4期14卷 833-841页

作者： shantata Kudchadkar safia Ahmed Tanmoy Mukherjee jayesh sagar Department of Colorectal surgery Luton&Dunstable University Hospital NHS Foundation TrustLuton LU40DZUnited Kingdom

Incidence of colorectal cancer(CRC)is on *** approximately 70%of all CRC cases are sporadic in nature,20%-25%have familial aggregation and only<5%is hereditary in *** of individuals with hereditary predilection for CR... 详细信息

Incidence of colorectal cancer(CRC)is on *** approximately 70%of all CRC cases are sporadic in nature,20%-25%have familial aggregation and onlys hereditary in *** of individuals with hereditary predilection for CRC is critical,as it has an impact on their overall surgical management including surgical timing,approach&technique and determines the role of prophylactic surgery and *** review highlights the concept of hereditary CRC,provides insight into its molecular basis,possibility of its application into clinical practice and emphasizes the current treatment strategies with surgical management,based on the available international guidelines.

关键词： Colorectal cancer Lynch syndrome Familial adenomatosis polyposis Immunohistochemistry Metachronous colon cancer

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Digital phenotyping in depression diagnostics: Integrating psychiatric and engineering perspectives

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World Journal of Psychiatry 2022年第3期12卷 393-409页

作者： jayesh Kamath Roberto Leon Barriera Neha Jain Efraim Keisari Bing Wang Department of Psychiatry and Immunology University of Connecticut School of MedicineUniversity of Connecticut Health CenterFarmingtonCT 06030United States Department of Psychiatry University of Connecticut School of MedicineUniversity of Connecticut Health CenterFarmingtonCT 06032United States Department of Computer science and Engineering University of ConnecticutStorrsCT 06269United States

Depression is a serious medical condition and is a leading cause of disability *** depression diagnostics and assessment has significant limitations due to heterogeneity of clinical presentations,lack of objective assessments,and assessments that rely on patients'perceptions,memory,and *** phenotyping(DP),especially assessments conducted using mobile health technologies,has the potential to greatly improve accuracy of depression diagnostics by generating objectively measurable *** includes two primary sources of digital data generated using ecological momentary assessments(EMA),assessments conducted in real-time,in subjects'natural *** includes active EMA,data that require active input by the subject,and passive EMA or passive sensing,data passively and automatically collected from subjects'personal digital *** raw data is then analyzed using machine learning algorithms to identify behavioral patterns that correlate with patients'clinical *** investigations have also shown that linguistic and behavioral clues from social media data and data extracted from the electronic medical records can be used to predict depression *** other sources of data and recent advances in telepsychiatry can further enhance DP of the depressed *** of DP endeavors depends on critical contributions from both psychiatric and engineering *** current review integrates important perspectives from both disciplines and discusses parameters for successful interdisciplinary collaborations.A clinically-relevant model for incorporating DP in clinical setting is *** model,based on investigations conducted by our group,delineates development of a depression prediction system and its integration in clinical setting to enhance depression diagnostics and inform the clinical decision making ***,challenges,and opportunities pertaining to clinical integration of DP of depressio

关键词： Digital phenotyping Depression Ecological momentary assessment Telepsychiatry Passive sensing smart phone

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Role of colonic stents in the management of colorectalcancers

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World Journal of Gastrointestinal Endoscopy 2016年第4期8卷 198-204页

作者： jayesh sagar Department of surgery Medway Maritime HospitalGillingham ME7 5NYUnited Kingdom

Colorectal cancer is one of the commonly encountered cancers across the Western World. In United Kingdom, this constitutes third most common ranked cancer and second most common ranked cause of cancer related deaths. Its acute presentation as a malignant colonic obstruction imposes challenges in its management. Colonic stent has been used for many years to alleviate acute obstruction in such cases allowing optimisation of patient's physiological status and adequate staging of cancer. In this review, current literature evidence regarding use of colonic stent in acute malignant colonic obstruction is critically appraised and recommendations on the use of colonic stent are advocated.

关键词： Colorectal Cancer surgery Emergency stent

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