检索结果-南通市图书馆

Parameter Identification in Traveling Wave Solutions of a Modified Fisher’s Equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2023年第5期14卷 290-313页

作者： Zhixuan Jia ali nadim Institute of Mathematical Sciences Claremont Graduate University Claremont USA

In this work, we focus on the inverse problem of determining the parameters in a partial differential equation from given numerical solutions. For this purpose, we consider a modified Fisher’s equation that includes a relaxation time in relating the flux to the gradient of the density and an added cubic non-linearity. We show that such equations still possess traveling wave solutions by using standard methods for nonlinear dynamical systems in which fixed points in the phase plane are found and their stability characteristics are classified. A heteroclinic orbit in the phase plane connecting a saddle point to a node represents the traveling wave solution. We then design parameter estimation/discovery algorithms for this system including a few based on machine learning methods and compare their performance.

关键词： PDE Traveling Wave Solution Stability Analysis Machine Learning Optimization Embedding

A Poisson Solver Based on Iterations on a Sylvester System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2018年第6期9卷 749-763页

作者： Michael B. Franklin ali nadim Institute of Mathematical Sciences Claremont Graduate University Claremont CA USA

We present an iterative scheme for solving Poisson’s equation in 2D. Using finite differences, we discretize the equation into a Sylvester system, AU +UB = F, involving tridiagonal matrices A and B. The iterations occur on this Sylvester system directly after introducing a deflation-type parameter that enables optimized convergence. Analytical bounds are obtained on the spectral radii of the iteration matrices. Our method is comparable to Successive Over-Relaxation (SOR) and amenable to compact programming via vector/array operations. It can also be implemented within a multigrid framework with considerable improvement in performance as shown herein.

关键词： Poisson’s Equation Sylvester System Multigrid

Parameter Identification in Traveling Wave Solutions of a Modified Fisher’s Equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Disaster Risk Reduction in Iran:Lessons and "Lessons Learned" from Three Large Earthquake Disasters——Tabas 1978,Rudbar 1990,and Bam 2003

Applied Mathematics（应用数学） 2023年第5期

作者： Zhixuan Jia ali nadim

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2015年第4期6卷 415-427页

作者： Michaela Ibrion Mohammad Mokhtari Farrokh nadim Department of Geography Faculty of Social Sciences and Technology ManagementNorwegian University of Science and Technology(NTNU) National Center for Earthquake Prediction and Seismological Research International Institute of Earthquake Engineering and Seismology(IIEES) Natural Hazards Debris Slides and Geo RiskNorwegian Geotechnical Institute(NGI)

This article addresses three large earthquake disasters in Iran: Tabas in 1978, Rudbar in 1990, and Bam in 2003. Lessons and 'Lessons Learned' from these three earthquake disasters were investigated together with their contributions over time towards earthquake disaster risk reduction in Iran. Many lessons from 1978 Tabas, 1990 Rudbar, and 2003 Bam did not become 'Lessons Learned' and they were identified again within the dramatic context of other earthquake disasters in various places of Iran. Both lessons and 'Lessons Learned' from Tabas, Rudbar, Bam,and other earthquake disasters in Iran require a sustainable long-term framework—an earthquake culture.

关键词： Bam Earthquake disaster risk reduction Lessons Lessons learned Rudbar Tabas

Generalized Derivations in Rings with Involution

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2017年第3期24卷 393-399页

作者： Nadeem Ahmad Dar Abdul nadim Khan Department of Computer Science and Engineering Islamic University of Science and Technology J & K India Department of Mathematics Faculty of Science & Arts in Rabigh King Abdulaziz University Saudi Arabia

The main purpose of this paper is to study generalized derivations in rings with involution which behave like strong commutativity preserving mappings. In fact, we prove the following result： Let R be a noncommutative prime ring with involution of the second kind such that char（R） ≠ 2. If R admits a generalized derivation F ： R → R associated with a derivation d ： R → R such that [F（x）,F（x＊）] - [x,x＊] = 0 for all x ∈ R, then F（x）= x for all x ∈ R or F（x） = -x for all x ∈ R. Moreover, a related result is also obtained.

关键词： prime ring generalized derivation involution

Giardiasis in patients with dyspeptic symptoms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第42期11卷 6667-6670页

作者： Javed Yakoob Wasim Jafri Shahab Abid nadim Jafri Saeed Hamid Hasnain ali Shah Lubna Rizvi Muhammad Islam Hizbullah Shaikh Section of Gastroenterology Department of Medicine Aga Khan University Hospital Karachi 74800 Sindh Pakistan Department of Pathology Aga Khan University Hospital Karachi 74800 Sindh Pakistan

AIM： To investigate the prevalence of giardiasis in patients with dyspeptic symptoms. METHODS＂ Clinical records of consecutive patients who attended Gastroenterology Department at Aga Khan University Hospital from January 2000 to June 2003 and had esophagogastroduodenoscopy （EGD） with duodenal biopsies and international classification of diseases 9th revision with clinical modifications （ICD-9-CM） coded with giardiasis were studied. RESULTS： Two hundred and twenty patients fulfilled the above criteria. There were 44% （96/220） patients who were giardiasis positive, 72% （69/96） of them were males and 28% （27196） of them were females. There were 65% （81/124） males and 35% （43/124） females who were giardiasis negative. The mean age of patients with giardiasis was 28±17 years, while that of giardiasis negative patients was 40±18 years （P〈0.001）. In patients with giardiasis, abdominal pain was present in 71% （68/96） of patients （P = 0.02） and diarrhea in 29% （28/96）（P = 0.005）; duodenitis in 25% （24/96） on EGD （P = 0.006） and in 68% （65/96） on histopathology （P = 0.002）. CONCLUSION： Giardiasis occurs significantly in young people with abdominal pain, while endoscopic duodenitis is seen in only 25% of giardiasis positive cases, which supports routine duodenal biopsy.

关键词： Abdominal pain Giardiasis Stool examination EGD Duodenal biopsy

All-optical scheme for implementation of tri-state Pauli-X,Y and Z quantum gates using phase encoding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optoelectronics Letters 2021年第12期17卷 746-750页

作者： Mir nadim Sarfaraj Sourangshu Mukhopadhyay Department of Physics The University of BurdwanBurdwan 713104India

Quantum logic gates are the basic building blocks of quantum computing *** qubit Pauli-X,Y and Z quantum gates are very much well known in quantum computing *** this paper,we develop tri-state Pauli-X,Y and Z quantum gates using phase encoding technique of *** phase encoding mechanism makes the implementation of those gates easier even with tri-state *** light is used for signal representation,one can exploit the parallelism in operation.

关键词： quantum X,Y Pauli

East meets West: what opportunities arise in comparing international guidelines for management of cirrhosis?

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2023年第1期12卷 121-123页

作者： Celyn Idami nadim Mahmud Department of Medicine Pennsylvania HospitalUniversity of Pennsylvania Health SystemPhiladelphiaPAUSA Division of Gastroenterology and Hepatology Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA Department of Medicine Corporal Michael J.Crescenz VA Medical CenterPhiladelphiaPAUSA Center for Clinical Epidemiology and Biostatistics Department of BiostatisticsEpidemiology&InformaticsPerelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA Leonard David Institute of Health Economics University of Pennsylvania Perelman School of MedicinePhiladelphiaPAUSA

The management of patients with cirrhosis is complex and subject to ever-evolving literature and *** the most recent Japanese practice guidelines for liver cirrhosis(1),Yoshiji et *** a number of key updates to guidan... 详细信息

关键词： Japan guidelines cirrhosis management transjugular intrahepatic portosystemic shunt(TIPS) spontaneous bacterial peritonitis prophylaxis(SBP prophylaxis)

Advances in telemedicine for the management of the elderly cardiac patient

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2021年第9期18卷 759-767页

作者： nadim El Jamal Bernard Abi-Saleh Hussain Isma’eel Division of Cariology American University of Beirut Faculty of Medicine and Medical CenterBeirutLebanon

Telemedicine is the use of information and communication technology to deliver healthcare at a *** has been resorted to during the COVID-19 pandemic to lessen the need for in-person patient care decreasing the risk of transmission,and it can be of benefit afterward in the management of cardiac *** elderly population has unique challenges concerning the use of telehealth *** thus review the advances in telemedicine technologies in treating elderly cardiac patients including in our discussion only studies with a mean age of participants above *** monitoring of blood pressure,weight,and symptoms,along with home ECG recording has been found to be superior to usual in-clinic follow *** remote monitoring with video conferencing with physicians,patient education websites,and applications is also of *** monitoring of Implantable Cardioverter Defibrillators(ICD)and Cardiac Resynchronization Therapy Defibrillators(CRT-D)is also beneficial but can be at the cost of an increase in both appropriate and inappropriate *** sensing devices compatible with remote monitoring have been developed and have been shown to improve care and *** smartphone software can detect arrhythmias using home ECG recordings and can detect atrial fibrillation using smartphone *** monitoring of implanted pacemakers has shown non-inferiority to in clinic follow *** the other hand,small-scale questionnaire-based studies demonstrated the willingness of the elderly cardiac patients to use such technologies,and their satisfaction with their use and ease of ***-scale studies should further investigate useability in samples more representative of the general elderly population with more diverse socioeconomic and educational ***,it seems that studying integrating multiple technologies into telehealth programs is of great *** efforts should also be put in validating the te

关键词： ECG CRT ICD Advances in telemedicine for the management of the elderly cardiac patient