检索结果-南通市图书馆

Constraining the f(R,T)=R+2λT cosmological model using recent observational data

Chinese Physics C 2023年第11期47卷 167-176页

作者： N.Myrzakulov M.Koussour Alnadhief H.A.Alfedeel e.i.hassan L.N.Gumilyov eurasian National University Astana 010008Kazakhstan Ratbay Myrzakulov eurasian international Centre for Theoretical Physics Astana 010009Kazakhstan Quantum Physics and Magnetism Team LPMCFaculty of Science Ben M'sikCasablanca Hassan II UniversityMorocco Department of Mathematics and Statistics Imam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh 13318Saudi Arabia Department of Physics Faculty of ScienceUniversity of KhartoumP.O.Box 321Khartoum 11115Sudan Centre for Space Research North-West UniversityPotchefstroom 2520South Africa

in this study,we conduct a comprehensive investigation of the cosmological model described by f(R,T)=R+2λT(whereλrepresents a free parameter)in light of the most recent observational *** constraining the model using the Hubble and Pantheon datasets,we determine its compatibility with the observed behavior of the *** this purpose,we adopt a parametric form for the effective equation of state(eoS)*** parametric form allows us to describe the evolution of the eoS parameter with respect to redshift and investigate its behavior during different cosmic *** analysis of the deceleration parameter reveals an accelerating Universe with a present value of q0=−0.64_(−0.03)^(+0.03),indicating the current phase of accelerated *** transition redshift is found to be ztr=0.53_(−0.03)^(+0.04),marking the epoch of transition from deceleration to *** also analyze the evolution of important cosmological parameters,including the density parameter,pressure,effective eoS,and *** findings collectively demonstrate the viability of the f(R,T)cosmological model as a robust candidate capable of engendering the requisite negative pressure,thereby efficiently propelling cosmic ***,the undertaken stability analysis underscores the model's stability within the broader cosmic *** providing the best-fit values for the coupling parameterλ,this approach motivates and encourages further exploration into the extensive landscape of this model and its potential applications across diverse realms of cosmology and astronomy.

关键词： f(R,T)gravity eoS parameter observational constraints dark energy

来源：

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

Facile Synthesis of Naphtho[2,3-dJthiazoles, Naphtho[2,3-e]-[1,3,4]thiadiazines and Bis（naphtho[2,3-d]thiazolyl）copper（ll） Derivatives from Heteroylthiosemicarbazides

引用

Chinese Journal of Chemistry 2016年第8期34卷 814-822页

作者： Alaa A. hassan Nasr K. Mohamed Lamiaa e. Abd ei-Haleem Stefan Brase Martin Nieger Chemistry Department Faculty of Science Minia University 61519 EI-Minia A. R. Egypt institute of Organic Chemistry Karlsruhe Institute of Technology Fritz-Haber-Weg 6 76131 Karlsruhe Germany Laboratory of inorganic Chemistry Department of Chemistry University of Helsinki P.O.Box55 (A. I. Virtasenaukio 1) 00014 Helsinki Finland

A one step synthesis protocol for the conversion of heteroylthiosemicarbazides and 2,3-dichloro-1,4-naphthoquinone to naphtho[2,3-d]thiazoles, naphtho[2,3-e][1,3,4]thiadiazines as well as bis(naphtho[2,3-d]thiazolyl)copper(ii) derivatives is described. The products were conclusively confirmed by single crystal X-ray analyses. A mechanism for the formation of the products is presented.

关键词： heteroylthiosemicarbazides 2 3-dichloro-1 4-naphthoquinone naphtho[2 3-d]thiazoles naphtho[2 3-e][1 3 4]thiadiazines bis(naphtho[2 3-d]thiazolyl)copper(ii) derivatives

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

economic Development through Medicinal and Aromatic Plants(MAPs) Cultivation in Hindu Kush Himalaya Mountains of District Swat, Pakistan

引用

Journal of Mountain Science 2015年第5期12卷 1292-1301页

作者： hassan SHeR Mary e. BARKWORTH Center for Plant Sciences and Biodiversity University of Swat intermountain Herbarium Department of Biology Utah State University

Poverty is pervasive in the Swat Valley in northwestern Pakistan, and most people survive by farming small landholdings. However, many supplement their meager subsistence earnings by collecting and selling plant material for use in herbal medicine. This material is wild-harvested, but collectors seem not to fully appreciate the potential value of the plant material they collect nor the longterm impact their collection has on local plant populations. A model project supported by the international Food Policy Research institute(iFPRi)persuaded small-scale farmers in four different villages to use some of their land for cultivating traditionally wild-harvested species of medicinal and aromatic plants(MAPs) with high market value. The farmers were provided seeds or rhizomes of five MAPs and asked to monitor their germination and growth on 25 m2 plots during a 12 month period. At the end of the study, growth and yield data from the four localities were compared and economic analyses conducted to determine the profitability of the species based on yields, prevailing market prices, and costs of production. Five of the cultivated species were subsequently marketed and their value evaluated:Sesamum indicum, Linum usitatissimum, Ocimum basilicum, Nigella sativa and Viola pilosa. The MAPs V. pilosa and O. basilicum were the most profitable,whereas Nigella sativa was the least profitable because of its low germination rate. The net income from all but Nigella was higher than that would have been earned by planting the same area with the predominant cereals or tomatoes. in addition to demonstrating the feasibility and financial benefits of cultivating MAPs as a cash crop, this model study identified a number of additional steps that would increase the benefits of MAPs cultivation in this area.A combination of specialized education, market infrastructure development and a small loans program would enable farmers to increase their agricultural income without damaging the area's pl

关键词： Biological diversity Medicinal plant Aromatic plant Agriculture productivity Traditionalcrops economic analysis Himalaya Mountains

来源：

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

Square-root parametrization of dark energy in f(Q)cosmology

引用

Communications in Theoretical Physics 2023年第12期75卷 105-114页

作者： M Koussour N Myrzakulov Alnadhief H A Alfedeel e.i.hassan D Sofuoğlu Safa M Mirgani Quantum Physics and Magnetism Team LPMCFaculty of Science Ben M'sikCasablanca Hassan II University L.N.Gumilyov eurasian National University Ratbay Myrzakulov eurasian international Centre for Theoretical Physics Department of Mathematics and Statistics Imam Mohammad Ibn Saud Islamic University(IMSIU) Department of Physics Faculty of ScienceUniversity of Khartoum Centre for Space Research North-West University Department of Physics Istanbul University Vezneciler 34134

This paper is a parametrization of the equation of state(eo S)parameter of dark energy(De),which is parameterized using square-root(SR)form i.e.ω_(SR)=ω_(0)+ω_(1)z/√z^(2)+1,where ω_(0)and ω_(1) are free *** parametrization is examined in the context of the recently suggested f(Q)gravity theory as an alternative to general relativity(GR),in which gravitational effects are attributed to the non-metricity scalar Q with the functional form f(Q)=Q+αQ^(n),whereαand n are arbitrary *** derive observational constraints on model parameters using the Hubble dataset with 31 data points and the Supernovae(SNe)dataset from the Pantheon samples compilation dataset with 1048 data *** the current model,the evolution of the deceleration parameter,density parameter,eoS for De,and Om(z)diagnostic have all been *** has been shown that the deceleration parameter favors the current accelerated expansion *** has also been shown that the eoS parameter for De has a quintessence nature at this time.

关键词： cosmology dark energy f(Q)gravity eoS parameter

来源：

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

A method for matching response spectra of endurance time excitations via the Fourier transform

引用

earthquake engineering and engineering Vibration 2020年第3期19卷 637-648页

作者： Mohammadreza Mashayekhi Homayoon eestekanchi hassan Vafai Department of Civil engineering Sharif University of TechnologyTehranIran

The endurance time(eT)method is a dynamic analysis in which structures are subjected to intensifying excitations,also known as eT excitation functions(eTeF).The eT method is a tool for structural response *** main advantage of the eT method over conventional approaches is its much lower demand for computational *** concept of acceleration spectra is used in generating existing *** is expected that eTeF acceleration spectra increase consistently with time and remain proportional to a target *** unconstrained optimization is commonly used to generate *** new eTeFs is a complicated time-consuming mathematical *** the target acceleration spectrum changes,new eTeFs must be *** study intends to modify existing eTeFs to be compatible with a desired acceleration *** process,called spectral matching,obviates the need for using the complicated generating procedure in simulating new *** spectral matching is introduced in this paper for the first time.A Fourier-based method for eTeFs spectral matching is *** algorithm is then applied in a case *** are presented to prove the efficiency of the algorithm.

关键词： spectrum. excitation acceleration

来源：

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

The sexually dimorphic expression of glutamate transporters and their implication in pain after spinal cord injury

引用

Neural Regeneration Research 2025年第11期20卷 3317-3329页

作者： Jennifer M.Colón-Mercado Aranza i.Torrado-Tapias iris K.Salgado Jose M.Santiago Samuel e.Ocasio Rivera Dina P.Bracho-Rincon Luis H.Pagan Rivera Jorge D.Miranda Department of Physiology University of Puerto RicoMedical Sciences CampusSan JuanPRUSA National institutes of Health National Human Genome Research InstituteBethesdaMDUSA Universidad Central del Caribe School of MedicineBayamónPRUSA University of Puerto Rico Carolina CampusCarolinaPRUSA institute of Neurobiology San JuanPRUSA

in addition to the loss of motor function,~60% of patients develop pain after spinal cord *** cellular-molecular mechanisms are not well understood,but the data suggests that plasticity within the rostral,epicenter,and caudal penumbra of the injury site initiates a cellularmolecular interplay that acts as a rewiring mechanism leading to central neuropathic *** can lead to the formation of new connections triggering abnormal sensory *** excitatory glutamate transporters are responsible for the reuptake of extracellular glutamate which makes them a critical target to prevent neuronal hyperexcitability and *** previous studies showed a sexually dimorphic therapeutic window for spinal cord injury after treatment with the selective estrogen receptor modulator *** this study,we investigated the anti-allodynic effects of tamoxifen in male and female rats with spinal cord *** hypothesized that tamoxifen exerts anti-allodynic effects by increasing the expression of glutamate transporters,leading to reduced hyperexcitability of the secondary neuron or by decreasing aberrant *** and female rats received a moderate contusion to the thoracic spinal cord followed by subcutaneous slow-release treatment of tamoxifen or matrix pellets as a control(placebo).We used von Frey monofilaments and the“up-down method”to evaluate mechanical *** treatment decreased allodynia only in female rats with spinal cord injury revealing a sexdependent *** expression profile of glutamatergic transporters(excitatory amino acid transporter 1/glutamate aspartate transporter and excitatory amino acid transporter 2/glutamate transporter-1)revealed a sexual dimorphism in the rostral,epicenter,and caudal areas of the spinal cord with a pattern of expression primarily on *** rodents showed a significantly higher level of excitatory amino acid transporter-1 expression while male rodents showed increased

关键词： allodynia central neuropathic pain eAAT-1/GLAST eAAT-2/GLT-1 glutamate transporters selective estrogen receptor modulator sexual dimorphism spinal cord injury trauma

来源：

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

Moisture effect on the combustion of a single copper concentrate particle in a flash smelting furnace

引用

international Journal of Minerals,Metallurgy and Materials 2014年第3期21卷 251-258页

作者： e.hassan Zaim S.H.Mansouri A.Arab Solghar Department of Mechanical engineering School of Engineering Shahid Bahonar University Department of Mechanical engineering School of Engineering Vali-e-Asr University

A mathematical model has been presented to study the combustion of a single copper concentrate particle with high moisture content. By using the presented model, the effect of particle moisture content on particle temperature, sulfur oxidation, and combustion heat generation has been evaluated. The mineralogical composition of the commonly used concentrate at Khatoonabad flash smelting furnace has been used in this study. it was found that the particle moisture content is removed in the sub-second time range and thus the moisture has marginal impact on the variation of particle temperature and on the reaction rate when the gas temperature is assumed to be constant in the reaction shaft. When a concentrate with high moisture content is charged, the particle size enlargement due to the agglomeration of concentrate particles causes an abrupt fall in the particle reaction rate.

关键词： flash smelting furnaces copper smelting moisture combustion

来源：

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

east African topography and volcanism explained by a single,migrating plume

引用

Geoscience Frontiers 2020年第5期11卷 1669-1680页

作者： Rakib hassan Simon e.Williams Michael Gurnis Dietmar Muller School of Geosciences Room 412Madsen Building F09 Eastern AvenueThe University of SydneyNSW2006Australia Seismological Laboratory California Institute of TechnologyPasadenaCA91125USA Now at Geoscience Australia GPO Box 378CanberraACT2601Australia State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China

Anomalous topographic swells and Cenozoic volcanism in east Africa have been associated with mantle *** models involving one or more fixed plumes beneath the northeastward migrating African plate have been suggested to explain the space-time distribution of magmatism in east *** devise paleogeographically constrained global models of mantle convection and,based on the evolution of flow in the deepest lower mantle,show that the Afar plume migrated southward throughout its *** models suggest that the mobile Afar plume provides a dynamically consistent explanation for the spatial extent of the southward propagation of the east African rift system(eARS),which is difficult to explain by the northeastward migration of Africa over one or more fixed plumes alone,over the last≈45 *** further show that the age-progression of volcanism associated with the southward propagation of eARS is consistent with the apparent surface hotspot motion that results from southward motion of the modelled Afar plume beneath the northeastward migrating African *** models suggest that the Afar plume became weaker as it migrated southwards,consistent with trends observed in the geochemical record.

关键词： Numerical mantle flow models Deep mantle flow LLSVP morphology Plume dynamics Plume motion Dynamic topography

来源：

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

Constrained bilinear control problem： Application to a cancer chemotherapy model

引用

international Journal of Biomathematics 2017年第4期10卷 189-209页

作者： e1 hassan Zerrik Nihale e1 Boukhari MA CS Team Faculty of Sciences Moulay Ismail University Meknes Morocco

The aim of this paper is to investigate the optimal control problem for finite-dimensional bilinear systems and its application to a chemotherapy model. We characterize an opti- mal control that minimizes a quadratic cost functional in two cases of constrained admis- sible controls, then we give sufficient conditions for the uniqueness of such a control, and we derive useful algorithms for the computation of the optimal control. The established results are applied to a cancer chemotherapy bilinear model in order to simulate the opti- mal treatment protocol using two different approaches： one based on a limited instant toxicity, and the other on a limited cumulative toxicity along the therapy session.

关键词： Bilinear systems optimal control chemotherapy instant toxicity cumulativetoxicity.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

NeCAB family of neuronal calcium-binding proteins in health and disease

引用

Neural Regeneration Research 2025年第5期20卷 1236-1243页

作者： Diones Bueno Michael K.e.Schafer Sudena Wang Michael J.Schmeisser Axel Methner institute for Molecular Medicine University Medical Center of the Johannes Gutenberg-UniversityMainzGermany Department of Anesthesiology University Medical Center of the Johannes Gutenberg-UniversityMainzGermany institute of Anatomy University Medical Center of the Johannes Gutenberg-UniversityMainzGermany

The N-terminal eF-hand calcium-binding proteins 1–3(NeCAB1–3) constitute a family of predominantly neuronal proteins characterized by the presence of at least one eF-hand calcium-binding domain and a functionally less well characterized C-terminal antibiotic biosynthesis monooxygenase domain. All three family members were initially discovered due to their interactions with other proteins. NeCAB1 associates with synaptotagmin-1, a critical neuronal protein involved in membrane trafficking and synaptic vesicle exocytosis. NeCAB2 interacts with predominantly striatal G-protein-coupled receptors, while NeCAB3 partners with amyloid-β A4 precursor protein-binding family A members 2 and 3, key regulators of amyloid-β production. This demonstrates the capacity of the family for interactions with various classes of proteins. NeCAB proteins exhibit distinct subcellular localizations: NeCAB1 is found in the nucleus and cytosol, NeCAB2 resides in endosomes and the plasma membrane, and NeCAB3 is present in the endoplasmic reticulum and Golgi apparatus. The antibiotic biosynthesis monooxygenase domain, an evolutionarily ancient component, is akin to atypical heme oxygenases in prokaryotes but is not wellcharacterized in vertebrates. Prokaryotic antibiotic biosynthesis monooxygenase domains typically form dimers, suggesting that calcium-mediated conformational changes in NeCAB proteins may induce antibiotic biosynthesis monooxygenase domain dimerization, potentially activating some enzymatic properties. However, the substrate for this enzymatic activity remains uncertain. Alternatively, calcium-mediated conformational changes might influence protein interactions or the subcellular localization of NeCAB proteins by controlling the availability of protein–protein interaction domains situated between the eF hands and the antibiotic biosynthesis monooxygenase domain. This review summarizes what is known about genomic organization, tissue expression, intracellular localization, interac

关键词： calcium eF hand mitochondria nervous system signal transduction

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：