检索结果-南通市图书馆

Journal of Ocean Engineering and Science 2020年第2期5卷 186-195页

作者： Rabha W.Ibrahim Chandrashekhar Meshram samir B.Hadid Shaher Momani Cloud Computing Center University MalayaMalaysia Department of Mathematics and Computer Science Rani Durgavati UniversityJabalpurIndia Department of Mathematics and Sciences College of Humanities and SciencesAjman UniversityAjmanUAE Department of Mathematics Faculty of ScienceUniversity of JordanAmman 11942Jordan

It is well known that there is a deep connection between the symmetric and traveling wave *** has been shown that all symmetric waves are traveling *** this paper,we establish new analytic solution collections of nonlinear conformable time-fractional water wave dynamical equation in a complex *** this purpose,we construct a new definition of a symmetric conformable differential operator(SCDO).The operator has a symmetric representation in the open unit *** using SCDO,we generalize a class of water wave dynamical equation type time-space fractional complex Ginzburg-Landau *** results show that the obtainable approaches are powerful,dependable and prepared to apply to all classes of complex differential equations.

关键词： Analytic solution Conformable calculus Fractional calculus Water wave equations Majorization Subordination and superordination

Improved Hybrid Reactive Power Compensation System Based on FC and STATCOM and Its Control Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2022年第2期8卷 29-41页

作者： Xiheng Liang Fei Jiang Xing Peng Liansong Xiong Yongbin Jiang samir Gautam Zhichang Li School of Electrical and Information Engineering Changsha University of Science&TechnologyChangsha 410076China School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Electrical Engineering The University of SydneySydney NSW 2006Australia Beijing Sgitg-Accenture Information Technology Co. Ltd.Beijing 100080China

The purpose of this study is to solve the main problems in distribution networks,including increased line loss and reduced power supply quality caused by insufficient capacitive reactive *** reduce the capacity,voltage,and current stress of an active module of a compensation device and improve the cost performance of the device,an improved hybrid reactive power compensation system based on a fixed capacitor(FC)and a static synchronous compensator(STATCOM)is *** topological structure and basic operating principle of the proposed reactive power compensation system are *** addition,from the perspectives of output voltage,current,power,loss of the active part,and system compensation cost,the performances of the proposed reactive compensator and the inductively coupled STATCOM(L-STATCOM)are compared and ***,the key parameters of the proposed system are designed,and the joint optimization control strategy of the FC and STATCOM is *** correctness and effectiveness of the proposed topology structure and control method are verified by simulations.

关键词： Static synchronous compensator hybrid topology reactive power compensation fixed capacitor

Extra-hepatic manifestations associated with hepatitis E virus infection:a comprehensive review of the literature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gastroenterology Report 2016年第1期4卷 1-15,I0001页

作者： Fateh Bazerbachi samir Haffar Sushil K Garg John R Lake Division of Gastroenterology and Hepatology University of MinnesotaMinneapolisMN 55455USA Department of Gastroenterology and Hepatology University of DamascusDamascusSyrian Arab Republic

Background and aims:Hepatitis E virus(HEV)infection is a significant public health problem that afflicts almost 20 million individuals annually and causes acute liver injury in 3.5 million,with approximately 56000 *** with other viral hepatitides,extra-hepatic manifestations could represent an important aspect of this *** spectrum of these manifestations is still *** pancreatitis and neurological,musculoskeletal,hematological,renal,and other immune-mediated manifestations have been *** aim of this article is to comprehensively review the published literature of extra-hepatic manifestations associated with HEV *** sources:We searched the PubMed database using the MeSH term“hepatitis E”and each of the extra-hepaticmanifestations associated with HEV *** language or date restrictions were set in these *** retrieving articles with non-A,non-B hepatitis were *** articles were identified through the reference lists of included ***:Several extra-hepatic manifestations associated with HEV infection have been *** temporal association between some extra-hepatic manifestations and HEV infection and the exclusion of other possible etiologies suggests that HEV infection could have caused some of *** to the available data,HEV infection appears to be strongly associated with acute pancreatitis,neurological disorders(with primarily dominant peripheral nerve involvement,most commonly manifested as Guillain-Barre´syndrome,followed by neuralgic amyotrophy),hematological diseases(hemolytic anemia due to glucose phosphate dehydrogenase deficiency,and severe thrombocytopenia),glomerulonephritis,and mixed *** data are needed to clarify whether an association exists with musculoskeletal or other immunemediated ***:HEV infection should be considered in patients with acute pancreatitis,Guillain-Barre´syndrome,neuralgic amyotrophy,hem

关键词： hepatitis E virus viral hepatitis extra-hepatic manifestations vaccine primary prevention

A New Full-NT-Step Infeasible Interior-Point Algorithm for SDP Based on a Specific Kernel Function

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 2012年第9期3卷 1014-1022页

作者： samir Bouali samir Kabbaj Department of Mathematics and Informatics Faculty of Sciences University Ibn Tofail Kenitra Morocco

In this paper, we propose a new infeasible interior-point algorithm with full NesterovTodd (NT) steps for semidefinite programming (SDP). The main iteration consists of a feasibility step and several centrality steps. We used a specific kernel function to induce the feasibility step. The analysis is more simplified. The iteration bound coincides with the currently best known bound for infeasible interior-point methods.

关键词： Semidefinite Programming Full Nesterov-Todd Steps Infeasible Interior-Point Methods Polynomial Complexity Kernel Functions

Influence of feeding crimped kernel maize silage on the course of subclinical necrotic enteritis in a broiler disease model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Nutrition 2017年第4期3卷 392-398页

作者： Nisha Sharma samir Ranjitkar Nishchal K.Sharma Ricarda M.Engberg Department of Animal Science Aarhus University School of Environment and Rural Science University of New England

This experiment was carried out with 375 male broilers(Ross 308) from days 1 to 28 to evaluate the influence of crimped kernel maize silage(CKMS) on the manifestation of subclinical necrotic enteritis,microbiota counts, organic acid production and relative weights of gastrointestinal segments. A necrotic enteritis disease model was applied. Birds were allocated into 3 different dietary treatments: a maizebased feed(MBF, control diet), and 2 diets supplemented with 15%(CKMS15) or 30%(CKMS30) of crimped ensiled kernel maize. The disease model involved a 10-time overdose of an attenuated live vaccine against coccidiosis given orally on day 17, followed by oral inoculation of Clostridium perfringens Type A(S48,10~8 to 10~9 bacteria/bird) twice daily on days 18,19, 20 and 21. Scoring of intestinal lesions was performed on days 22, 23, 25 and 28. Ileal and caecal digesta samples were collected for the quantification of selected bacterial groups and organic acids. The results showed that there was no effect of dietary treatments on small intestinal lesion scores(P> 0.05). Lesions scores peaked on days 23 and 25 and decreased again on day 28(P = 0.001). No effect of age on microbiota counts was observed, but feeding of CKMS30 reduced the number of coliforms in ileal contents(P = 0.01). Dietary treatments did not affect organic acid concentrations in ileum and caeca, but there was an effect of age; butyric acid was higher on days 22, 23 and 25 than on day 28(P = 0.04). Acetic acid and propionic acid concentrations in caeca were the highest on days 22 and 28 but the lowest on days 23 and 25. Relative gizzard and caeca weights were increased, and relative ileum weights were decreased when birds were fed CKMS30(P < 0.05). In conclusion, the inclusion of CKMS in broiler diets had no effects on the course of necrotic enteritis but had potential benefits in terms of inhibition of potentially harmful microorganisms.

关键词： Broiler Challenge model Clostridium perfringens Crimped kernel maize silage Necrotic enteritis

Overactivation of histone deacetylases and EZH2 in Wilms tumorigenesis

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2023年第5期10卷 1783-1786页

作者： Chao-Hui Chen Nguyen Yen Nhi Ngo Alun Wang samir El-Dahr Hongbing Liu Department of Pediatrics Tulane University School of MedicineNew OrleansLA 70112USA Department of Pathology and Laboratory Medicine Tulane University School of MedicineNew OrleansLA 70112USA

Wilms tumor (WT) is the most common childhood kidney cancer. Although WT is largely curable, current treatments fail in up to 15 percent of patients. Moreover, survivors suffer from the complications and late effects of the aggressive treatments. Thus, there is a critical need to improve our understanding of tumorigenesis to develop novel therapies to reduce the treatment burden while maintaining excellent survival rates. WT is believed to arise from the immature kidney cells, nephron progenitor cells (NPCs), which have failed to differentiate properly. Previous studies revealed that Wilms cells share a transcriptional and epigenetic landscape with normal renal stem cells.1 Although several studies have shown the positive associations between WT in children and embryonic exposure to adverse environments, the underlying mechanisms remain unknown. Altered epigenetics is central to oncogenesis in many pediatric cancers. The critical contribution of epigenetic dysregulation to pediatric tumors provides a compelling rationale for the therapeutic potential of epigenetic drugs. Histone deacetylases (HDACs) and Enhancer of Zeste Homolog 2 (EZH2, a histone H3K27 methyltransferase), have been demonstrated to play a critical role in self-renewal and differentiation of mouse NPCs.2,3 In addition, altered expression and mutations of HDACs and EZH2 have been linked to many human cancers, including WT. Thus, they are among the most promising therapeutic targets for cancer treatment. We reasoned that WT would result from the unrestrained proliferation of progenitor cells due to overactive HDAC1/2 (HDAC1 and HDAC2), and EZH2. We tested this hypothesis by analyzing a clinical specimen received from the left kidney tumor of an 11-year-old male patient diagnosed with WT and four other human WT specimens. We have the approval from Tulane Human Research Protection Office & Institutional Review Boards (Study number: 2019–623) to study WT specimens. The tumor (9.5 cm × 8 cm × 7.5 cm) is cl

关键词： EZH2 Figure approval

Chemical composition of Rosmarinus and Lavandula essential oils and their insecticidal effects on Orgyia trigotephras(Lepidoptera,Lymantriidae)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2015年第2期8卷 98-103页

作者： Ben Slimane Badreddine Ezzine Olfa Dhahri samir Chograni Hnia Ben Jamaa Mohamed Lahbib Institut Superieur des Sciences et Technologies de l'Environnement de Borj-Cédria B.P.1003Hammam-Lif 2050-Tunisia Institut National de Recherche en Génie Rural Eaux et ForêtsTunis.Tunisia Institut National des Sciences Appliquees et Technologiques.Tunis.Tunisia

Objective:To evaluate toxic activities of essential oils obtained from Rosmarinus officinalis and Lavandula stoechas against the fourth larval instars of Orgyia ***:A total of 1 200 larvae were divided into three groups Ⅰ,Ⅱ,Ⅲ.Group Ⅰ was to investigate the effect of extracted essential oils from these aromatic plants as gastric *** thuringiensis and ethanol were used as control *** Ⅱ was used as contact action and Group Ⅲ was used as fumigant *** and ethanol were used as control *** the three experiments,the effect of essential oils on larvae was ***:The chemical composition of essential oils from two medicinal plants was determined and,their insecticidal effects on the fourth larval slate of Orgyia trigotephras were *** two simples presented an insecticidal activity,nevertheless Rosmarinus officinalis essential oil was less efficient compared to Lavandula stoechas one are ***:The relationship between the chemical composition and the biologieal activities is confirmed by the present *** the potential uses of these essential oils as bioinsecticides can he considered as an alternative to the use of synthetic products.

关键词： Rosmarinus Lavandula Orgyia trigotephras Essential oils Insect control

Oxidative Stress, Biochemical and Histopathological Alterations in the Liver and Kidney of Female Rats Exposed to Low Doses of Deltamethrin (DM):A Molecular Assessment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2012年第6期25卷 672-683页

作者： CHARGUI Issam GRISSA Intissar BENSASSI Fatma HRIRA Mohamed Yahia HAOUEM samir HAOUAS Zohra BENCHEIKH Hassen Laboratory of Histology-Cytology and Genetics (02/UR/08-03) Faculty of Medicine 5019 Monastir Tunisia Laboratory of Research on Biologically Compatible Compounds Faculty of Dentistry Street Avicenne 5019 Monastir Tunisia Laboratory of Plant Protection The National Institute for Agricultural Research INRA Tunisia Street Hedi Karray 2049 Ariana Tunisia Laboratory of Biochemistry (UR 07/06) Faculty of pharmacy 5019 Monastir Tunisia Laboratory of Physiology Faculty of Medicine 5019 Monastir Tunisia

Objective To evaluate histopathological alterations of the liver and kidney of female rats exposed to low doses of DM and its potential genotoxic activity. Methods Female Wistar rats were randomly assigned to control （3 groups, 6 rats in each） and treatment groups （3 groups, 6 rats in each）. They were subjected to subcutaneous injections of DM （at doses of 0.003, 0.03, and 0.3 mg/kg bw/d） after 30, 45, and 60 d, respectively. Results Significant alterations were recorded in liver parenchyma induced by hepatic vacuolization, fragmented chromatin in nuclei, dilatation of sinusoids and congestions. Lesions within proximal and distal tubules were observed in the kidneys. Tissue congestions and severe alterations within glomeruli were visible. DM as a pyrethroid insecticide induced significant increase （P〈_O.05） of plasma MDA concentrations after 45 d. A significant increase （P_〈0.05） in plasma ALT （after 45 and 60 d） and AST （after 60 d） concentrations was recorded as compared to controls. During the whole experimental period the toxic agent provoked significant DNA damages （P〈0.05）, especially in the dominance of classes 3 and 4 of obtained comet. Conclusion DM even at a very low dose displays harmful effects by disrupting hepatic and renal function and causing DNA damages in puberscent female rats. Low doses of DM are hepatotoxic and nephrotoxic.

关键词： Deltamethrin Rats Liver Kidney Histopathology Comet assay DNA damage.

Bifurcation-based fractional-order PI~λD~μ controller design approach for nonlinear chaotic systems

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2018年第2期19卷 180-191页

作者： Karima RABAH samir LADACI Mohamed LASHAB Signal Processing Laboratory Department of Electronics University of Mentouri Electrical Engineering Department University of 20 Aoùt 1955-Skikda Department of Electronics Electrotechnics and AutomaticsNational Polytechnic School of Constantine Electrical Engineering Department University of 20 Aoùt 1955-Skikda

We propose a novel approach called the robust fractional-order proportional-integral-derivative（FOPID）controller, to stabilize a perturbed nonlinear chaotic system on one of its unstable fixed points. The stability analysis of the nonlinear chaotic system is made based on the proportional-integral-derivative actions using the bifurcation diagram. We extract an initial set of controller parameters, which are subsequently optimized using a quadratic criterion. The integral and derivative fractional orders are also identified by this quadratic criterion. By applying numerical simulations on two nonlinear systems, namely the multi-scroll Chen system and the Genesio-Tesi system,we show that the fractional PI~λD~μ controller provides the best closed-loop system performance in stabilizing the unstable fixed points, even in the presence of random perturbation.

关键词： Fractional order system Bifurcation diagram Fractional PIλDμ controller Multi-scroll Chen chaoticsystem Genesio-Tesi chaotic system

Neuroprotective effects of berry fruits on neurodegenerative diseases

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2014年第16期9卷 1557-1566页

作者： Selvaraju Subash Musthafa Mohamed Essa samir Al-Adawi Mushtaq A.Memon Thamilarasan Manivasagam Mohammed Akbar Department of Food Science and Nutrition College of Agricultural and Marine Sciences Sultan Qaboos University Muscat Sultanate of Oman Ageing and Dementia Research Group Sultan Qaboos University College of Medicine and Health Sciences Sultan Qaboos University College of Veterinary Medicine Washington State University Department of Biochemistry and Biotechnology Annamalai University Section of Molecular Pharmacology and Toxicology Laboratory of Membrane Biochemistry and Biophysics National Institute on Alcohol Abuse and Alcoholism National Institutes of Health

Recent clinical research has demonstrated that berry fruits can prevent age-related neurodegenerative diseases and improve motor and cognitive functions. The berry fruits are also capable of modulating signaling pathways involved in inflammation, cell survival, neurotransmission and enhancing neuroplasticity. The neuroprotective effects of berry fruits on neurodegenerative diseases are related to phytochemicals such as anthocyanin, caffeic acid, catechin, quercetin, kaempferol and tannin. In this review, we made an attempt to clearly describe the beneficial effects of various types of berries as promising neuroprotective agents.

关键词： nerve regeneration berry fruit neurodegenerative disease neuroprotection Alzheimer'sdisease Parkinson's disease review neural regeneration