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ON HYPERSTABILITY OF THE BIADDITIVE FUNCTIONAL EQUATION

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Acta Mathematica Scientia 2017年第6期37卷 1727-1739页

作者： Iz-iddine EL-FASSI Janusz BRZDEK Abdellatif CHAHBI samir KABBAJ Department of Mathematics Faculty of SciencesIbn Tofail UniversityBP 133KenitraMorocco Department of Mathematics Pedagogical UniversityPodchorazych 230-084 KrakowPoland

We present results on approximate solutions to the biadditive equationf（x＋y,z-w）＋f（x-y,z＋w）=2f（x,z）-2f（y,w）on a restricted domain. The proof is based on a quite recent fixed point theorem in some function spaces. Our main results state that, under some weak natural assumptions, functions satisfying the equation approximately （in some sense） must be actually solutions to it. In this way we obtain inequalities characterizing biadditive mappings and inner product spaces. Our outcomes are connected with the well known issues of Ulam stability and hyperstability.

关键词： hyperstability Ulam stability biadditive functional equation fixed point the-orem characterization of inner product space

Spatial and compositional variation in the fungal communities of organic and conventionally grown apple fruit at the consumer point-of-purchase

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Horticulture Research 2016年第1期3卷 76-87页

作者： Ahmed Abdelfattah Michael Wisniewski samir Droby Leonardo Schena Dipartimento di Agraria UniversitàMediterranea di Reggio CalabriaLocalitàFeo di Vito89124 ReggioCalabriaItaly U.S.Department of Agriculture-Agricultural Research Service(USDA-ARS) 2217 Wiltshire RoadKearneysvilleWV 25430USA Department of Postharvest and Food Sciences AROThe Volcani Center68 HaMccabim RoadRishon LeZion 7505101Israel

The fungal diversity in harvested apples from organic or conventional management practices was analyzed in different fruit locations(stem end,calyx end,peel,and wounded flesh)shortly after fruit purchase(T1)and after 2 weeks of storage(T5).A total of 5,760,162 high-quality fungal sequences were recovered and assigned to 8,504 Operational Taxonomic *** of the phylum Ascomycota were dominant in all samples and accounted for 91.6%of the total number of detected *** was followed by Basidiomycota(8%),Chytridiomycota(0.1%),and unidentified fungi(0.3%).Alpha and beta diversity analyses revealed the presence of significantly different fungal populations in the investigated fruit *** detected fungi,the genus Penicillium prevailed in the peel and in the wounded flesh while Alternaria *** in the calyx and stem end samples that included apple core *** taxonomic units that appear to be closely related to pathogenic fungi associated with secondary human infections were present in peel and ***,significantly different populations were revealed in organic and conventional apples and this result was consistent in all investigated fruit parts(calyx end,peel,stem end,and wounded flesh).Several unique taxa were exclusively detected in organic apples suggesting that management practices may have been a contributing factor in determining the taxa *** contrast,little differences were revealed in the two assessment times(T1 and T5).Results of the present study represent an advancement of the current knowledge on the fungal microbiota in collected fruit tissues of apple.

关键词： wound fungal apple

Interval oscillation criteria for forced Emden-Fowler functional dynamic equations with oscillatory potential

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Science China Mathematics 2013年第3期56卷 561-576页

作者： ANDERSON Douglas R. SAKER samir H. Department of Mathematics and Computer Science Concordia College Department of Mathematics Faculty of Science Mansoura University

Interval oscillation criteria are established for a second-order functional dynamic equation of Emden-Fowler type with oscillatory potential by applying Riccati and generalized Riccati techniques. The results represent further improvements on those given even for differential and difference equations. Some examples are considered to illustrate the main results.

关键词： oscillation forced dynamic equations time scales functional equations Riccati technique

Impairment of the Regulation of Gonadal Function in Channa punctatus by Metacid-50 and Carbaryl under Laboratory and Field Conditions

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Biomedical and Environmental Sciences 1990年第1期3卷 106-112页

作者： PROBODH GHOSH samir BHATTACHARYA SHELLEY BHATTACHARYA Environmental Toxicology Laboratory Visva-Bharati University Santiniketan-731 235. India Endocrinology Laboratory Department of Zoology Visva-Bharati University Santiniketan-731 235. India

Regulation of gonadal function by gonadotropic hormone (GtH) and gonadotropin-releasing hormone (GnRH) in Channa punctatus was significantly affected by nonlethal levels of Metacid-50 and Carbaryl. Under laboratory conditions, the time-dependent decrease in serum GtH level was higher in Carbaryl-treated fish than in Metacid-50-treated fish. The situation was reversed in the field, with a higher inhibitory effect of Metacid-50 being recorded. On the other hand, pituitary GtH content and GnRH activity were inhibited to a greater extent by Metacid-50 than by Carbaryl under both field and laboratory conditions. The present findings highlight that even low doses of Metacid-50 and Carbaryl are effective enough to cause reproductive damage, as evidenced by homeostatic unbalance of the reproductive regulatory system. 1990 Academic Press. Inc.

关键词： Impairment of the Regulation of Gonadal Function in Channa punctatus by Metacid-50 and Carbaryl under Laboratory and Field Conditions GtH

The Security Challenges of China’s Silk Road Economic Belt Initiative in the Southern Caucasus Region

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The Security Challenges of China’s Silk Road Economic Belt ...

作者： samir Mammadov 华中师范大学

学位级别：硕士

本研究探讨丝绸之路经济带项目在南高加索地区可能面临的安全挑战。研究人员探索并分析了该项目是如何实施的,以及哪些问题会对所需的丝绸之路经济带项目造成安全挑战。研究指出了三种可能的安全问题,并提出了预防措施。领土冲突的存在... 详细信息

本研究探讨丝绸之路经济带项目在南高加索地区可能面临的安全挑战。研究人员探索并分析了该项目是如何实施的,以及哪些问题会对所需的丝绸之路经济带项目造成安全挑战。研究指出了三种可能的安全问题,并提出了预防措施。领土冲突的存在被视为主要安全风险之一。本研究考察了难高加索地区国家的政治经济现状,并对其与中华人民共和国的关系进行了概述。数据显示,这三个国家对中国都持积极态度,都愿意吸引更多的中国投资到该地区。对华为驻高加索南部代表的采访表明,该地区的商业环境良好,中国企业和其他投资者对与该地区政府的关系感到满意。第二个潜在的安全挑战是南高加索国家(阿塞拜疆、亚美尼亚和格鲁吉亚)还可能存在足以影响项目实施的财务限制。该项目的第三安全挑战是中俄利益冲突对难高加索地区影响也使得这一项目可能存在安全挑战。这种可能性是基于俄罗斯在南高加索地区长期存在的利益,因为该地区也是苏联的一部分。目前,中俄关系水平相当高,鼓励双方降低可能发生利益冲突的风险。但是,如果关系恶化,丝绸之路经济带项目则可能面临安全挑战。本研究还专门以阿塞拜疆为例,探讨了两国之间关于丝绸之路经济带项目实施的一些现状及问题。研究者展示了当前两国经济和政治合作的各种实例并给予分析。作为进入欧洲市场的门户,阿塞拜疆现有的交通基础设施和投资环境鼓励中国企业更积极地参与阿塞拜疆的经济活动。总的来说,虽然存在安全挑战,但形势目前还是可控的,依然可以采取一些措施来确保项目的安全。在研究过程中,本人在阿塞拜疆和格鲁吉亚这两个过境国进行了两次访谈。一次是采访阿塞拜疆政府的一名高级官员,另一次则是与华为驻阿塞拜疆和格鲁吉亚的高层管理人员进行交流。由于没有任何外交关系,访问亚美尼亚的机会是有限的,这使得研究人员无法在亚美尼亚收集实地数据。

关键词：丝绸之路经济带南高加索政治中国-阿塞拜疆关系中国投资

Lanthanide amino acid Schiff base complexes:synthesis,spectroscopic characterization,physical properties and in vitro antimicrobial studies

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Journal of Rare Earths 2013年第7期31卷 715-721页

作者： samir Alghool M.Sh.Zoromba Hanan F.Abd El-Halim Department of Chemistry Faculty of SciencePort Said UniversityPort Said 42521Egypt Department of Chemistry Faculty of PharmacyMisr International UniversityIsmailia RoadKm 28 CairoEgypt

Complexes of La （III）, Nd（III）, Gd（III）, Sm（III）, and Ce（IV） were synthesized with Schiff base [（3,5-di-tert-butyl-2-hy- droxybenzyl） amino] acetic acid （H3L）. The ligand and its complexes were synthesized and characterized based on the following analysis： elemental analyses, FAB-mass, molar conductance measurements, magnetic measurement, UV-visible, IR, and NMR spectral studies. The spectral data revealed that the ligand acted as a neutral tridentate coordinating to metal ion through ONO donor sequence. Thermal degradation studies of the ligand and its complexes showed that the previous lanthanide complexes were more thermally stable than the ligand itself. The Schiff base and its complexes were screened for their antibacterial （Escherichia coli, Staphylococcus aureus） and antifungal （Aspergillus flavus and Candida Albicans）.

关键词： lanthanide Schiffbase complexes physical properties biological activity rare earths

Manipulating Nb-doped SrFeO_(3−δ)with excellent performance for proton-conducting solid oxide fuel cells

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Journal of Advanced Ceramics 2024年第5期13卷 579-589页

作者： Hailu Dai Hongzhe Du samir Boulfrad Shoufu Yu Lei Bi Qinfang Zhang School of Materials Science and Engineering Yancheng Institute of TechnologyYancheng 224051China College of Science&Engineering Hamad Bin Khalifa UniversityDoha 34110Qatar School of Resource Environment and Safety Engineering University of South ChinaHengyang 421001China

Nb-doped SrFeO_(3−δ)(SFO)is used as a cathode in proton-conducting solid oxide fuel cells(H-SOFCs).First-principles calculations show that the SrFe0.9Nb0.1O_(3−δ)(SFNO)cathode has a lower energy barrier in the cathode reaction for H-SOFCs than the Nb-free SrFeO_(3−δ)*** experimental studies show that Nb doping substantially enhances the performance of the SrFeO_(3−δ)***,oxygen vacancies(VO)were introduced into SFNO using the microwave sintering method,further improving the performance of the SFNO *** mechanism behind the performance improvement owing to VO was revealed using first-principles calculations,with further optimization of the SFNO cathode achieved by developing a suitable wet chemical synthesis route to prepare nanosized SFNO *** method significantly reduces the grain size of SFNO compared with the conventional solid-state reaction method,although the solid-state reaction method is generally used for preparing Nb-containing *** a result of defect engineering and synthesis approaches,the SFNO cathode achieved an attractive fuel cell performance,attaining an output of 1764 mW·cm−2 at 700℃ and operating for more than 200 *** manipulation of Nb-doped SrFeO_(3−δ)can be seen as a“one stone,two birds”strategy,enhancing cathode performance while retaining good stability,thus providing an interesting approach for constructing high-performance cathodes for H-SOFCs.

关键词： SrFeO_(3−δ)-(SFO) cathode proton conductor solid oxide fuel cells(SOFCs)

Transpressive Structures in the Ghadir Shear Belt, Eastern Desert, Egypt: Evidence for Partitioning of Oblique Convergence in the Arabian-Nubian Shield during Gondwana Agglutination

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1614-1646页

作者： Mohamed ABD EL-WAHED samir KAMH Mahmoud ASHMAWY Aly SHEBL Geology Department Faculty of Science Tanta University

Transpressional deformation has played an important role in the late Neoproterozoic evolution of the ArabianNubian Shield including the Central Eastern Desert of *** Ghadir Shear Belt is a 35 km-long,NW-oriented brittleductile shear zone that underwent overall sinistral transpression during the Late *** this shear belt,strain is highly partitioned into shortening,oblique,extensional and strike-slip structures at multiple ***,strain partitioning is heterogeneous along-strike giving rise to three distinct structural *** the East Ghadir and Ambaut shear belts,the strain is pure-shear dominated whereas the narrow sectors parallel to the shear walls in the West Ghadir Shear Zone are simple-shear *** domains are comparable to splay-dominated and thrust-dominated strike-slip shear *** kinematic transition along the Ghadir shear belt is consistent with separate strike-slip and thrustsense shear *** earlier fabric(S1),is locally recognized in low strain areas and SW-ward thrusts.S2 is associated with a shallowly plunging stretching lineation(L2),and defines^NW-SE major upright macroscopic folds in the East Ghadir shear belt.F2 folds are superimposed by^NNW–SSE tight-minor and major F3 folds that are kinematically compatible with sinistral transpressional deformation along the West Ghadir Shear Zone and may represent strain partitioning during deformation.F2 and F3 folds are superimposed by ENE–WSW gentle F4 folds in the Ambaut shear *** sub-parallelism of F3 and F4 fold axes with the shear zones may have resulted from strain partitioning associated with simple shear deformation along narrow mylonite zones and pure shear-dominant deformation in fold *** ENEstriking shear zones were subsequently active at ca.595 Ma,coeval with sinistral shearing along NW-to NNW-striking shear *** occurrence of upright folds and folds with vertical axes suggests that transpression plays a significant role in

关键词： Arabian-Nubian Shield Ghadir shear belt transpression splay-dominated and thrust-dominated strike-slip shear zones Egypt

Transfer Learning-Based Semi-Supervised Generative Adversarial Network for Malaria Classification

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Computers, Materials & Continua 2023年第3期74卷 6335-6349页

作者： Ibrar Amin Saima Hassan samir Brahim Belhaouari Muhammad Hamza Azam Institute of Computing Kohat University of Science and TechnologyKohat26000K.P.KPakistan College of Science and Engineering Hamad bin Khalifa UniversityDohaQatar Centre of Research in Data Science Computer and Information Sciences DepartmentUniversiti Teknologi PETRONASSeri Iskandar32610PerakMalaysia

Malaria is a lethal disease responsible for thousands of deaths worldwide every *** methods of malaria diagnosis are timeconsuming that require a great deal of human expertise and *** automated diagnosis of diseases is progressively becoming *** deep learning models show high performance in the medical field,it demands a large volume of data for training which is hard to acquire for medical ***,labeling of medical images can be done with the help of medical experts *** recent studies have utilized deep learning models to develop efficient malaria diagnostic system,which showed promising ***,the most common problem with these models is that they need a large amount of data for *** paper presents a computer-aided malaria diagnosis system that combines a semi-supervised generative adversarial network and transfer *** proposed model is trained in a semi-supervised manner and requires less training data than conventional deep learning *** of the proposed model is evaluated on a publicly available dataset of blood smear images(with malariainfected and normal class)and achieved a classification accuracy of 96.6%.

关键词： Generative adversarial network transfer learning semi-supervised malaria VGG16