检索结果-南通市图书馆

HAGEN POISEUILLE FLOW OF A GRANULAR mATERIAL IN A CYLINdER

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2001年第2期13卷 91-95页

作者： Liu, m.J. Tao, m.d. dept. of mech. and Eng. Sci. Fudan Univ. Shanghai 200433 China

The equations of motion for rapid flow of a granular material were derived and their solutions representing flow driven by a body force along an infinitely-long cylinder were obtained by the numerical method.

关键词： Boundary conditions Cylinders (shapes) Equations of motion Flow of solids Numerical methods

GRId GENERATION ANd NUmERICAL SImULATION OF 2-d RIVER FLOW

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2001年第2期13卷 50-54页

作者： Zhao, m.d. Li, Y.T. dept. of River Eng. Wuhan Univ. Wuhan 430072 China

This paper presents new weighting functions in grid generation and new discretizing scheme of momentum equations in numerical simulation of river flow. By using the new weighting functions, the curvilinear grid could be concentrated as desired near the assigned points or lines in physical plane. By using the new discretizing scheme, the difficulties caused by movable boundary and dry riverbed can be overcome. As an application, the flow in the Wuhan Section of Yangtze River is simulated. The computational results are in good agreement with the measured results. The new method is applicable to the numerical simulation of 2-d river flow with irregular region and moveable boundary.

关键词： Computer simulation Flow of fluids mathematical m.d.ls Poisson equation Two dimensional

Hydrogen Storage Capacity of C120 Nanocapsules： density Functional Theory Based Treatments

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第3期55卷 519-526页

作者： m.d. Ganji Gh. Valizadeh m. Jahan-tigh department of Chemistry Islamic Azad University Ghaemshahr Branch Mazandaran Iran

The adsorption of hydrogen molecule on the external surface of pure 0120 nanocapsule and endohedrallyH2 @C120 complex has been examined using the density functional theory calculations. Several different bonding configu- rations are considered for the hydrogen molecule approaching the outer surface of the considered nanocages. It has been found that the adsorbed H2 molecule bound weakly to the outer surface of the pure C1~0 nanocapsules in agreement with the recent experimental and theoretical results while, it prefers to be adsorbed rather strongly on the side wall of the endohedrally /-/2@C120 complex. The adsorption of a single layer and bi-layer of two tt2 molecules on the most stable states of the considered H2@C120 complex appears to be feasible, although the molecules of the second layer are weakly bound. Furthermore, it is found that the formation of 100% coverage is favorable therm.d.namically, which corresponds to about 20% by weight storage of 1-12 molecules. Thus, surprisingly, we arrive at the prediction that the C120 nanocapsules can be implemented as a novel material for energy storage.

关键词： adsorption encapsulation hydrogen storages carbon nanocapsule ab initio calculations

Notes on the Landmark development of CBR in China

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

中国康复医学杂志 2009年第1期24卷 3-4页

作者： dahong Zhuo, m.d. Faculty of Rehabilitation m.d.cine Sun Yat-Sen University WHO Collaborating Centre for Rehabilitation

Community-based rehabilitation has a history of 22 years in *** spite of the preliminary achievement and experiences obtained by the pioneering and trial projects,it was not until the beginning of the new century that CBR in China experienced a landmark *** is characterized by a number of favorable policy by the government for CBR;the mechanism facilitating primary health care with CBR,a new work-force system of CBR reorganized with better motivation and efficiency,99 demonstration projects of CBR bringing about benchmark promotion effect and the active involvement in CBR by social resources agents.

关键词： CBR 中国医疗卫生行业发展历史

应用64层CT对心肌灌注缺损、局部室壁运动及左室功能的综合评估

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2008年第5期31卷 401-401页

作者： R.C. Cury K. Nieman m.d. shapiro J.Butler C.H. Nomura m. Ferencik 邱建星（译）唐光健（校） department of Radiology and Cardiac MR-PET-CT Program Massachusetts General Hospital and Harvard Medical School 165 Cambridge St Suite 400 Boston MA 02114 USA. 不详

目的评估64层CT评价心肌灌注缺损（Pd），局部室壁运动（RWm）和左室（Lv）功能的准确性。方法所有心肌梗死（mI）病人签署知情同意书。本研究经机构审查委员会批准并依从HIPAA法案。102例病人（34例近期患急性mI，68例未患mI）接受了... 详细信息

目的评估64层CT评价心肌灌注缺损（Pd），局部室壁运动（RWm）和左室（Lv）功能的准确性。方法所有心肌梗死（mI）病人签署知情同意书。本研究经机构审查委员会批准并依从HIPAA法案。102例病人（34例近期患急性mI，68例未患mI）接受了心脏多层CT检查。分析心脏多层CT影像以评估心肌Pd、RWm异常和LV功能。多层CT获得的LV总体功能及RWm与经胸超声心动图（TTE）对照。Pd由多层CT检出，并评价其与心脏生化指标及SPECT心肌灌注成像的相关性。多层CT诊断急性mI的根据，是有与RWm异常相匹配的Pd并与临床评估对照。结果多层CT获得的总体心功能（r=0．68）和RWm（K=0，79）与TIE相关性良好。

关键词：局部室壁运动心肌梗死临床评估灌注缺损左室功能 64层CT 多层CT检查心脏生化指标

PROPERTIES, WELdABILITY ANd APPLICATIONS OF AdVANCEd WROUGHT SUPERALLOYS FOR GAS TURBINE ENGINES

在线全文

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2005年第1期18卷 1-14页

作者： d.L. Klarstrom V.R. Ishwar m.d. Rowe Haynes International Inc. Kokomo Indiana IN 46904-9013 USAHaynes International Inc. Kokomo Indiana IN 46904-9013 USAHaynes International Inc. Kokomo Indiana IN 46904-9013 USA

Alloy selection and alloy design both require consideration of an array of material attributes, including in-service properties, weldability and fabricability. Critical properties of advanced wrought superalloys for gas turbine applications include high temperature strength, thermal stability, oxidation resistance and fatigue resistance. In this paper, the properties of twelve wrought solid-solution-strengthened and six age-hardenable superalloys are compared. Weldability is an important attribute and can be a major limiting factor in the use of certain alloys. Weldability test methods are discussed and the resistance of alloys to solidification cracking and strain-age cracking is compared. The use of weldability testing in the development of m.d.rn wrought su-peralloys is discussed with several examples cited. Finally, alloy selection for gas turbine components is outlined, taking into account both alloy properties and fabricability.

关键词： wrought superalloys mechanical properties strain-age cracking of weldments selection and application of wrought superalloys

Neurogenesis dynamics in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： moawiah m.Naffaa department of Psychology and Neuroscience Duke UniversityDurhamNCUSA department of Cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons migrating to the granule cell layer and glomerular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit rem.d.ling triggered by memory and learning processes. However, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. moreover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory information processing. This adaptive process responds to changes in epithelial composition and contributes to the formation of olfactory memories by m.d.lating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions remains a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around mitral and tufted cells. This organizational pattern significantly impacts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and memory. Additionally, this organization is further shaped by axon terminals originating from cortical and subcortical regions. despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these complex and highly interconnected processes have not been comprehensively studied as a whole. Therefore, this manuscript aims to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These mechanisms are thought to support olfactory learning and memory, potentially through increased

关键词： network adaptability neurogenesis neuronal communication olfactory bulb olfactory learning olfactory memory synaptic plasticity

Percolation analysis of large-scale wireless balloon networks

在线全文

学校读者我要写书评

暂无评论

digital Communications and Networks 2019年第2期5卷 84-93页

作者： m.d. Nashid Anjum Honggang Wang Hua Fang University of massachusetts dartmouth 285 Old Westport RdDartmouthMA 02747USA

Recent advancements in wireless technology have tested Wireless Balloon Networks (WBNs) as an ideal solution for the provision of internet facilities in deprived and challenging areas. A few high profile companies, such as Google, Space data Inc., etc., have already m.d. news by initiating projects based on high-altitude WBNs in order to provide internet facilities in remote areas. Unfortunately, the technical details have mainly been kept confidential so far. In this paper, we attempt to analyze the percolation properties of large-scale WBNs, considering both homogenous and heterogenous wireless nodes. In order to do so, we m.d.led a WBN as a large-scale random network where the path-loss m.d.ls of homogenous and heterogenous WBNs were reduced to Gdm (Gilbert's disk m.d.l) and RGdm (Random Gilbert's disk m.d.l), respectively. The bounds of the critical density regime were derived for both percolation m.d.ls. Additionally, this paper implemented an experimental test bed for the WBN percolation m.d.l. Consequently, the findings of this research may prove crucial in estimating critical network properties.

关键词： Percolation Connectivity WBN PPP Gdm

Additive neurorestorative effects of exercise and docosahexaenoic acid intake in a mouse m.d.l of Parkinson’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 574-586页

作者： Olivier Kerdiles méryl-Farelle Oye mintsa mi-mba Katherine Coulombe Cyntia Tremblay VincentÉmond martine Saint-Pierre Clémence Rouxel Line Berthiaume Pierre Julien Francesca Cicchetti Frédéric Calon Facultéde pharmacie UniversitéLaval1050 Avenue de la MédecineQuebecQCCanada Axe Neuroscience Centre de recherche du CHU de Québec-UniversitéLaval(Pavillon CHUL)2705 Boulevard LaurierQuebecQCCanada Institute of Nutrition and Functional Foods QuebecQCCanada Optinutribrain International Associated Laboratory(NutriNeuro FranceINAFCanada)QuebecQCCanada Axe Endocrinologie et Néphrologie Centre de recherche du CHU de Québec-UniversitéLavalQuebecQCCanada département de m.d.cine Facultéde MédecineUniversitéLavalQuebecQCCanada département de Psychiatrie et Neurosciences Facultéde MédecineQuebecQCCanada

There is a need to develop interventions to slow or reverse the degeneration of dopamine neurons in Parkinson’s disease after *** that preclinical and clinical studies suggest benefits of dietary n-3 polyunsaturated fatty acids,such as docosahexaenoic acid,and exercise in Parkinson’s disease,we investigated whether both could synergistically interact to induce recovery of the dopaminergic ***,mice received a unilateral stereotactic injection of 6-hydroxydopamine into the striatum to establish an animal m.d.l of nigrostriatal *** weeks after lesion,animals were fed a docosahexaenoic acid-enriched or a control diet for the next 8 *** this period,the animals had access to a running wheel,which they could use or *** acid treatment,voluntary exercise,or the combination of both had no effect on(i)distance traveled in the open field test,(ii)the percentage of contraversive rotations in the apomorphine-induction test or(iii)the number of tyrosine-hydroxylase-positive cells in the substantia nigra pars ***,the docosahexaenoic acid diet increased the number of tyrosine-hydroxylase-positive terminals and induced a rise in dopamine concentrations in the lesioned *** to docosahexaenoic acid treatment or exercise alone,the combination of docosahexaenoic acid and exercise(i)improved forelimb balance in the stepping test,(ii)decreased the striatal dOPAC/dopamine ratio and(iii)led to increased dopamine transporter levels in the lesioned *** present results suggest that the combination of exercise and docosahexaenoic acid may act synergistically in the striatum of mice with a unilateral lesion of the dopaminergic system and provide support for clinical trials combining nutrition and physical exercise in the treatment of Parkinson’s disease.

关键词： 6-hydroxydopamine dopamine dopamine transporter exercise neurorestoration Parkinson’s disease polyunsaturated fatty acids omega-3