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141.
142.
An experimental and numerical study has been carried out to investigate the heat transfer characteristics of a horizontal
circular cylinder exposed to a slot jet impingement of air. A square-edged nozzle is mounted parallel with the cylinder axis
and jet flow impinges on the bottom of the cylinder. The study is focused on low Reynolds numbers ranging from 120 to 1,210,
Grashof numbers up to Gr = 10Re
2 and slot-to-cylinder spacing from 2 to 8 of the slot width. The flow field is greatly influenced by the slot exit velocity
and the buoyancy force due to density change. A Mach–Zehnder Interferometer is used for measurement of local Nusselt number
around the cylinder at 10° interval. It is observed that the average Nusselt number decreases with increasing the jet spacing
and increases with rising the Reynolds number. A finite volume method utilizing a curvilinear coordinate transformation is
used for numerical modeling. The numerical results show good agreement with the experimental results. The flow and thermal
field are seen to be stable and symmetric around the cylinder over the range of parameters studied. 相似文献
143.
Kaveh Sookhak Lari Maarten van Reeuwijk Čedo Maksimović 《Heat and Mass Transfer》2013,49(8):1191-1203
We report on RANS simulations of high Schmidt number turbulent mass transfer due to a first-order reaction on the surface of a d-type rough wall. We find that for low reaction coefficients, the additional surface area of the rough wall causes an increased mass transfer in comparison with a smooth wall. However, when the reaction coefficient is high, the mass transfer becomes lower than for a smooth wall. A detailed analysis shows that the mass transport in the cavity is dominated by diffusion which becomes the limiting factor at high reaction coefficients. A conceptual model, which is in good agreement with the simulations, highlights that the influence of geometry roughness is not confined to the roughness Reynolds number for molecular-diffusion-dominated cavities. 相似文献
144.
145.
We predict new oscillations in the frequency dependence of the intensity autocorrelation functions of waves for a tube geometry. We have performed numerical simulations which clearly confirm the existence of new long-range correlations. 相似文献
146.
Moshe Kaveh 《Waves in Random and Complex Media》1991,1(3):S121-S128
A review is presented of some new and exciting phenomena regarding the multiple scattering of optical waves in random systems. In particular, the author develops the important role played by the vector nature of the wave on memory effects (the 'polarization memory effect'), correlations and statistical fluctuations ('microstatistics'). He also describes the recent progress on the effect of a restricted geometry on correlation phenomena and nonRayleigh statistics. 相似文献
147.
The unusual temperature dependence of the electrical resistivity of Hg3?δAsF6 (δ = 0.18?0.22) is discussed in the framework of a nearly square Fermi surface model. This model predicts a T3 dependence of the resistivity, in close agreement with the recently observed T2.8 dependence. 相似文献
148.
Xianhai Tian Lina Song Kaveh Farshadfar Matthias Rudolph Frank Rominger Thomas Oeser Alireza Ariafard A. Stephen K. Hashmi 《Angewandte Chemie (International ed. in English)》2020,59(1):471-478
We report a switchable synthesis of acylindoles and quinoline derivatives via gold‐catalyzed annulations of anthranils and ynamides. α‐Imino gold carbenes, generated in situ from anthranils and an N,O‐coordinated gold(III) catalyst, undergo electrophilic attack to the aryl π‐bond, followed by unexpected and highly selective 1,4‐ or 1,3‐acyl migrations to form 6‐acylindoles or 5‐acylindoles. With the (2‐biphenyl)di‐tert‐butylphosphine (JohnPhos) ligand, gold(I) carbenes experienced carbene/carbonyl additions to deliver quinoline oxides. Some of these epoxides are valuable substrates for the preparation of 3‐hydroxylquinolines, quinolin‐3(4H)‐ones, and polycyclic compounds via facile in situ rearrangements. The reaction can be efficiently conducted on a gram scale and the obtained products are valuable substrates for preparing other potentially useful compounds. A computational study explained the unexpected selectivities and the dependency of the reaction pathway on the oxidation state and ligands of gold. With gold(III) the barrier for the formation of the strained oxirane ring is too high; whereas with gold(I) this transition state becomes accessible. Furthermore, energetic barriers to migration of the substituents on the intermediate sigma‐complexes support the observed substitution pattern in the final product. 相似文献
149.
Xianhai Tian Lina Song Dr. Kaveh Farshadfar Dr. Matthias Rudolph Dr. Frank Rominger Dr. Thomas Oeser Prof. Dr. Alireza Ariafard Prof. Dr. A. Stephen K. Hashmi 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(1):479-486
We report a switchable synthesis of acylindoles and quinoline derivatives via gold-catalyzed annulations of anthranils and ynamides. α-Imino gold carbenes, generated in situ from anthranils and an N,O-coordinated gold(III) catalyst, undergo electrophilic attack to the aryl π-bond, followed by unexpected and highly selective 1,4- or 1,3-acyl migrations to form 6-acylindoles or 5-acylindoles. With the (2-biphenyl)di-tert-butylphosphine (JohnPhos) ligand, gold(I) carbenes experienced carbene/carbonyl additions to deliver quinoline oxides. Some of these epoxides are valuable substrates for the preparation of 3-hydroxylquinolines, quinolin-3(4H)-ones, and polycyclic compounds via facile in situ rearrangements. The reaction can be efficiently conducted on a gram scale and the obtained products are valuable substrates for preparing other potentially useful compounds. A computational study explained the unexpected selectivities and the dependency of the reaction pathway on the oxidation state and ligands of gold. With gold(III) the barrier for the formation of the strained oxirane ring is too high; whereas with gold(I) this transition state becomes accessible. Furthermore, energetic barriers to migration of the substituents on the intermediate sigma-complexes support the observed substitution pattern in the final product. 相似文献
150.
Navid Amini Saeedeh Mazinani Seyed-Omid Ranaei-Siadat Mohammad Reza Kalaee Saeed Hormozi Kaveh Niknam Nasrin Firouzian 《Applied biochemistry and biotechnology》2013,170(1):91-104
In this work, polyacrylamide/multi-walled carbon nanotubes (MWCNT) solution is electrospun to nanocomposite nanofibrous membranes for acetylcholinesterase enzyme immobilization. A new method for enzyme immobilization is proposed, and the results of analysis show successful covalent bonding of enzymes on electrospun membrane surface besides their non-covalent entrapment. Fourier transform infrared spectroscopy, mechanical and thermal investigations of nanofibrous membrane approve successful cross-linking and enzyme immobilization. The enzyme relative activity and kinetic on both pure and nanocomposite membranes is investigated, and the results show proper performance of designed membrane to even improve the enzyme activity followed by immobilization compared to free enzyme. Scanning electron microscopy images show nanofibrous web of 3D structure with a low shrinkage and hydrogel structure followed by enzyme immobilization and cross-linking. Moreover, the important role of functionalized carbon nanotubes on final nanofibrous membrane functionality as a media for enzyme immobilization is investigated. The results show that MWCNT could act effectively for enzyme immobilization improvement via both physical (enhanced fibers’ morphology and conductivity) and chemical (enzyme entrapment) methods. Figure
Mechanism for APTS surface modification of nanofibrous nanoweb for enzyme immobilization 相似文献