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71.
The energyE and angular momentuml dependence of optical potential for fusion of16O+208Pb system, observed by Christleyet al [5], is expressed as a function of radial kinetic energy (ɛ) instead of explicitE andl dependence. It is shown that the effects of different channel couplings, which result in different effective potentials,
can also be parametrized as a function ofɛ. A correlation is obtained between the energy dependent part of this effective potential and the maximum of the spin enhancement
around the Coulomb barrier and both these quantities depend on the details of the channel couplings. 相似文献
72.
Neeraj Khare S K Arora G S N Reddy V S Tomar V N Ojha N D Kataria A K Gupta 《Pramana》1989,33(2):L333-L338
The contact resistance (R
c) of the metal/YBCO interface has been studied in pressed indium, painted colloidal silver and thermally-evaporated silver
contact pads. Indium contacts always show the highest resistance amongst these three systems. In thermally-evaporated Ag contacts,
post-deposition thermal treatments show favourable effects on the reduction ofR
c. Heat treatment in oxygen atmosphere in two steps is essential to reduce theR
c values. Significant improvement in obtaining low resistivity contacts has been attributed to the diffusion of silver atoms
to grain boundaries at the surface of YBCO and to the enrichment of oxygen-deficient layer at the interface during thermal
treatment. 相似文献
73.
Heavy ion fusion cross sections and compound nucleus average spin values obtained from distribution of fusion barriers are
discussed. Various shapes of distribution functions are studied using a truncated Gaussian distribution function (TGD). It
is shown that fusion cross section and average spin values are less sensitive to different parametrization of TGD function,
whereas the second derivative of the product of energy and fusion cross sections (w.r.t. energy), obtained from the corresponding
TGD functions are significantly different depending on the shape of the barrier distribution function. It is also shown byχ
2 analysis of fusion cross section data that some systems favour a narrow Gaussian distribution function whereas others, for
which the vibrational and rotational collective states are less important, favour a flat barrier distribution. A physical
interpretation of the dynamical process that gives rise to different barrier distribution is given in the framework of microscopic
coupled channel calculations. 相似文献
74.
The effect of two-body nature of the nuclear shell model potential on the recent numerical calculations of the nucleai level
density has been examined. For the two most widely used single particle energy level schemes based on harmonic oscillator
and Woods-Saxon potential, this effect is shown to significantly modify the excitation energy dependence of the level densisties. 相似文献
75.
For an arbitrary class of graphs , there may not exist a function f such that , for every . When such a function exists, it is called a χ-binding function for . The problem of finding an optimal χ-binding function for the class of 3K
1-free graphs is open. In this paper, we obtain linear χ-binding function for the class of {3K
1, H}-free graphs, where H is one of the following graphs: , House graph and Kite graph. We first describe structures of these graphs and then derive χ-binding functions. 相似文献
76.
S. Kataria Avinash Patsha S. Dhara A. K. Tyagi Harish C. Barshilia 《Journal of Raman spectroscopy : JRS》2012,43(12):1864-1867
We report the synthesis of high‐quality graphene on Cu foils using hot‐filament chemical vapor deposition technique and demonstrate that by suitably varying the CH4 and H2 flow rates, one can also obtain hydrogenated graphene. Micro‐Raman spectroscopy studies confirm the growth of monolayer graphene as inferred from the intensity ratio of 2D to G peak which is nearly four in unhydrogenated samples. Detailed Raman area mapping confirms the uniform coverage of monolayer graphene. The grown layer is also transferred onto a Si substrate over ~10 × 10 mm sq. area. The present results provide a leap in synthesis technology of high‐quality graphene and pave way for scaling up the process. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
77.
Manoj Kumar Neha Sikri Sulekha Chahal Jitender Sharma Bhavna Sharma Poonam Yadav Monika Bhardwaj Divya Vashishth Pooja Kadyan Sudhir Kumar Kataria Sunita Dalal 《Molecules (Basel, Switzerland)》2021,26(13)
Urease is an enzyme that plays a significant role in the hydrolysis of urea into carbonic acid and ammonia via the carbamic acid formation. The resultant increase in pH leads to the onset of various pathologies such as gastric cancer, urolithiasis, hepatic coma, hepatic encephalopathy, duodenal ulcers and peptic ulcers. Urease inhibitors can reduce the urea hydrolysis rate and development of various diseases. The Cinnamomum genus is used in a large number of traditional medicines. It is well established that stem bark of Cinnamomum cassia exhibits antiulcerogenic potential. The present study evaluated the inhibitory effect of seven extracts of Cinnamomum camphora, Cinnamomum verum and two pure compounds Camphene and Cuminaldehyde on urease enzyme. Kinetic studies of potential inhibitors were carried out. Methanol extract (IC50 980 µg/mL) of C. camphora and a monoterpene Camphene (IC50 0.147 µg/mL) possess significant inhibitory activity. The Lineweaver Burk plot analysis suggested the competitive inhibition by methanol extract, hexane fraction and Camphene. The Gas Chromatography-Mass Spectroscopy (GC–MS) analysis of hexane fraction revealed the contribution of various terpenes. The present study targets terpenes as a new class of inhibitors that have potential therapeutic value for further development as novel drugs. 相似文献