检索结果-南通市图书馆

Regression analysis of squeezing-induced hybrid nanofluid flow in Darcy-Forchheimer porous medium

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

Applied mathematics and mechanics(English Edition) 2025年第1期46卷 193-208页

作者： K.mUHAmmAD m.SARFRAZ Department of Humanities and Sciences School of Electrical Engineering and Computer Science National University of Sciences and Technology Department of mathematics Quaid-i-Azam University

This article presents a mathematical model addressing a scenario involving a hybrid nanofluid flow between two infinite parallel plates. One plate remains stationary, while the other moves downward at a squeezing velocity. The space between these plates contains a Darcy-Forchheimer porous medium. A mixture of water-based fluid with gold(Au) and silicon dioxide(Si O2) nanoparticles is formulated. In contrast to the conventional Fourier's heat flux equation, this study employs the Cattaneo-Christov heat flux equation. A uniform magnetic field is applied perpendicular to the flow direction, invoking magnetohydrodynamic(mHD) effects. Further, the model accounts for Joule heating, which is the heat generated when an electric current passes through the fluid. The problem is solved via NDSolve in mATHEmATICA. Numerical and statistical analyses are conducted to provide insights into the behavior of the nanomaterials between the parallel plates with respect to the flow, energy transport, and skin *** findings of this study have potential applications in enhancing cooling systems and optimizing thermal management strategies. It is observed that the squeezing motion generates additional pressure gradients within the fluid, which enhances the flow rate but reduces the frictional drag. Consequently, the fluid is pushed more vigorously between the plates, increasing the flow velocity. As the fluid experiences higher flow rates due to the increased squeezing effect, it spends less time in the region between the plates. The thermal relaxation, however, abruptly changes the temperature, leading to a decrease in the temperature fluctuations.

关键词：

Search for microglia-specific peptides:advances in the discovery toolbox

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 471-472页

作者： Ivan Sarabia Kyle m.Koss Department of Surgery University of ArizonaTucsonAZUSA

Uncontrolled and chronic inflammatory states in the central nervous system(CNS)are the hallmark of neurodegenerative pathology and every injury or stroke-related *** key mediators of these neuroinflammatory states are glial cells known as microglia,the resident immune cell at the core of the inflammatory event,and astroglia,which encapsulate inflammatory insults in proteoglycan-rich scar *** gliotic scar blocks significant portions of healthy axonal networking,preventing *** most neuroinflammation is exclusively based on the responses of said microglia,their phenotypes are suggested to follow those of macrophages;m1 and m2 are opposites of pro-and ***,microglial phenotypes have been identified to be on an inflammatory spectrum encompassing developmental,homeostatic,and reparative behaviors as opposed to their ability to affect devastating cell death cascades and scar tissue formation.

关键词： inflammation pathology death

monomineral universal clinopyroxene and garnet barometers for peridotitic,eclogitic and basaltic systems

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2017年第4期8卷 775-795页

作者： I.V.Ashchepkov T.Ntaflos A.m.Logvinova Z.V.Spetsius H.downes N.V.Vladykin V.S.Sobolev Institute of Geology and mineralogy SB RAS Vienna University Alrosa Stock Company Department of Earth and Planetary Sciences Birkbeck University of London Institute of Geochemistry SD RAS

New versions of the universal Jd-Di exchange clinopyroxene barometer for peridotites,pyroxenites and eclogites,and also garnet barometer for eclogites and peridotites were *** were checked using large experimental data sets for eciogitic（~530） and peridotitic systems（〉650）.The precision of the universal Cpx barometer for peridotites based on Jd-Di exchange is close to Cr-Tschermal

关键词： Clinopyroxene Barometer Peridotite Eclogite Kimberlite Garnet

Defining sustainable limits during and after intensification in a maritime agricultural ecosystem

在线全文

学校读者我要写书评

暂无评论

Ecosystem Health and Sustainability 2017年第8期3卷 15-31页

作者： geoffrey R.Squire Ecological Sciences James Hutton InstituteDundeeUK

Introduction:Intensification of agricultural ecosystems in the 20th century proceeded by a series of innovations that initially ensured food security,but had negative consequences for the in-field and wider environments.A case study in the north Atlantic zone maritime cropland of the UK identified three phases:(1)reorganization between 1940 and 1960,(2)intensification leading to tripling of grain output(1960-1990),and(3)a leveling of output(1990-2015).Outcomes:Innovations that caused the changes together with their effect on life forms,ecological processes and the evolving social,economic and biophysical conditions are *** to design future sustainable systems are hampered by the absence of a baseline before intensification,by inadequate knowledge of in-field processes,and by uncertainty over"safe ranges"in which processes can operate without causing long-term system *** ranges are examined for three attributes recorded over all three phases,namely grain output,fertilizer input and the wild seedbank *** lower limits for grain and nitrogen were quantified as those that ensure grain *** upper limits were identified as those that were economically acceptable to farming in the face of major external perturbations related to food policy and environmental *** these upper limits,fields can maintain a generalist wild species seedbank that supports a farmland food ***:Some properties of the ecosystem therefore attained stability in phase ***,evidence of degrading soil,increasing pesticide use to maintain yield and collapse of specialist plant functions such as nitrogen fixation and pollination,suggest the system is moving toward a phase of decline.

关键词： Ecosystem services intensification resilience safe limits biodiversity

What are universities for?

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

Chinese Science Bulletin 2011年第23期56卷 2506-2517页

作者： geoffrey BOULTON Colin LUCAS The University of Edinburgh University of Oxford

Governments worldwide rightly regard universities as fundamental to the achievement of many national priorities. But it is the paper’s contention that many misunderstand their true benefit to society. Investments in universities are increasingly based on the belief that the science labs in particular of research-intensive universities can be the source of a continuous stream of people and ideas that will spawn innovative and fast growing companies to form the nexus of the knowledge-based economy. This belief is a source of misconceived policies that offer only ultimate disillusion. It is the totality of the university enterprise that is important, as the only place where that totality of ourselves and our world is brought together, and which makes it the strongest provider of the rational explanation and meaning that societies need. In research, universities create new possibilities; in teaching, they shape new people. Its graduates learn to seek the true meaning of things: to distinguish between the true and the merely seemingly true, to verify for themselves what is stable in that very unstable compound that often passes for knowledge. It is the complex, interacting whole of the university that is the source of the separate economic, social, cultural and utilitarian benefits valued by society. It needs to be understood, valued and managed as a whole. These perceptions are a direct challenge to not only to governments but to university administrators who have been either cowed or seduced into the slipshod thinking that is leading to demands that universities cannot satisfy, whilst obscuring their most important contributions. The challenge to both is to permit autonomy without oppressive accountability, and to give staff and students the freedom to think, speculate and research. These are the very conditions of the personal and collective creativity that are the sources of a university’s deepest benefits to its society.

关键词：研究型大学社会需要经济关系工作人员社会根源不稳定管理员实验室

A case for mantle plumes

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2005年第15期50卷 1541-1554页

作者： geoffrey F. Davies Research School of Earth Sciences Australian National University Canberra ACT 0200 Australia

The existence of at least several plumes in the Earth’s mantle can be inferred with few assumptions from well-established observations. As well, thermal mantle plumes can be predicted from well-established and quanti-fied fluid dynamics and a plausible assumption about the Earth’s early thermal state. Some additional important ob-servations, especially of flood basalts and rift-related mag-matism, have been shown to be plausibly consistent with the physical theory. Recent claims to have detected plumes using seismic tomography may comprise the most direct evidence for plumes, but plume tails are likely to be difficult to resolve definitively and the claims need to be well tested. Although significant questions remain about its viability, the plume hypothesis thus seems to be well worth continued investiga-tion. Nevertheless there are many non-plate-related mag-matic phenomena whose association with plumes is unclear or unlikely. Compositional buoyancy has recently been shown potentially to substantially complicate the dynamics of plumes, and this may lead to explanations for a wider range of phenomena, including “headless” hotspot tracks, than purely thermal plumes.

关键词：地球覆盖物羽毛流体动力学热量对流火山

Interfacial Phenomena in Solvent Extraction and Its Influence on Process Performance

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2006年第2期11卷 165-170页

作者： geoffrey W. Stevens Particulate Fluids Processing Centre Department of Chemical and Biomolecular Engineering The University of Melbourne Victoria 3010 Australia

Solvent extraction is now finding applications in a broader range of fields than the past. many of these applications require process equipment with shorter contact times, and in some cases to the point where the traditional equilibrium stage approach is not a good model for predicting performance. In addition, feed streams are becoming lower in concentration of the solute. This means greater feed to solvent flow ratios are being used and so loss of organics as entrainment in the feed is more of a concern both economically and environmentally. These trends mean that a greater emphasis is being placed on the kinetics of extraction and stripping in models to predict performance and on formation and coalescence of drops to control entrainment. This paper reviews recent advances in the tools for investigating kinetics and coalescence in solvent extraction processes and some of the insights that are being uncovered in these fundamental processes in solvent extraction technology.

关键词： solvent extraction drop coalescence liquid interface kinetics

Prognostic utility of NT-proBNP greater than 70,000 pg/mL in patients with end stage renal disease

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2018年第7期15卷 476-478页

作者： Julio Perez-downes Carlos Palacio Saif Ibrahim Patrisha Shelley Alan miller Pramod Reddy Division of General Internal medicine University of Florida College of Medicine-Jacksonville USA Department of Interventional Cardiology University of Alabama Birmingham Birmingham AL USA Division of Cardiology Department ofMedicine University of Florida College of Medicine- Jacksonville USA

Natriuretic peptides are synthesized in ventricular myocytes and released into the circulation in response to increased myocardial wall stress, Causes of myocardial wall stress include pulmonary hypertension, ventricu... 详细信息

关键词： End stage renal disease Heart failure Heart failure reduced ejection fraction mortality NT-proBNP

methane dehydroaromatization–A study on hydrogen use for catalyst reduction, role of molybdenum, the nature of catalyst support and significance of Bronsted acid sites

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第7期28卷 20-32页

作者： Vaidheeshwar Ramasubramanian Hema Ramsurn geoffrey L.Price Russell School of Chemical Engineering The University of Tulsa

methane dehydroaromatization was studied over mo/SiO2 and mo/HZSm-5 with different mo loadings(2, 5, 10 wt%) at 973 K and 1023 K in a recirculating batch reactor. H2 pretreatment at 1023 K prior to methane activation has significantly improved the catalyst activity with increase in mo loading and reduced the induction time on benzene formation in both mo/SiO2 and mo/HZSm-5. 10 wt% mo/HZSm-5 gave a maximum methane conversion of 19% and ~67% benzene selectivity at 1023 K. The XRD analysis of used catalysts revealed that the mo O3 species were converted to β-mo2C phase. Studies on mo/SiO2 catalysts showed that benzene was formed even in the absence of acidic zeolite sites. Reactions of ethylene in the presence of pure silica, HZSm-5 and in a blank reactor revealed that conversion of ethylene to aromatics was similar in case of the blank reactor and silica. Thus, it is believed that molybdenum carbide sites act as active sites only for C–H bond activation of methane and ethylene formation. Even though, ethylene can undergo subsequent oligomerization without any catalytic aid to form benzene at973 K and above addition of acidic zeolites improved the selectivity of benzene.

关键词： methane dehydroaromatization HZSm-5 Silica molybdenum loading H2 pretreatment Acidic function