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排序方式: 共有106条查询结果,搜索用时 31 毫秒
71.
Mohamed Hacene Ani Anciaux-Sedrakian Xavier Rozanska Diego Klahr Thomas Guignon Paul Fleurat-Lessard 《Journal of computational chemistry》2012,33(32):2581-2589
We present a way to improve the performance of the electronic structure Vienna Ab initio Simulation Package (VASP) program. We show that high-performance computers equipped with graphics processing units (GPUs) as accelerators may reduce drastically the computation time when offloading these sections to the graphic chips. The procedure consists of (i) profiling the performance of the code to isolate the time-consuming parts, (ii) rewriting these so that the algorithms become better-suited for the chosen graphic accelerator, and (iii) optimizing memory traffic between the host computer and the GPU accelerator. We chose to accelerate VASP with NVIDIA GPU using CUDA. We compare the GPU and original versions of VASP by evaluating the Davidson and RMM-DIIS algorithms on chemical systems of up to 1100 atoms. In these tests, the total time is reduced by a factor between 3 and 8 when running on n (CPU core + GPU) compared to n CPU cores only, without any accuracy loss. © 2012 Wiley Periodicals, Inc. 相似文献
72.
N. Begović Z. Marković S. Anić 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(13):2283-2287
The kinetics of gas reaction \(HOCl\underset{{k_r }}{\overset{{k_f }}{\longleftrightarrow}}H(^2 S) + OCl(X^2 \Pi _i )\) was analyzed by the MP4 method. In the temperature range of 100–373 K the rate constants k f and k r and equilibrium constant K were changed from 1.10 × 10?220 to 1.17 × 10?52 s?1, from 2.89 × 10?16 to 1.68 × 10?5s?1 and from 3.80 × 10?205 to 6.96 × 10?48 respectively. In the above temperature range, the activation energy of the forward reaction (E f) is 105.05 kcal/mol. In the same temperature interval there are two kinetic domains for the reverse reaction with activation energies (E r1 = 5.53 kcal/mol when T is 100–273 K and E r2 = 14.50 kcal/mol when T is 273–373 K, respectively. 相似文献
73.
Željko D. Čupić Ljiljana Z. Kolar‐Anić Slobodan R. Anić Stevan R. Maćešić Jelena P. Maksimović Marko S. Pavlović Maja C. Milenković Itana Nuša M. Bubanja Emanuela Greco Stanley D. Furrow Rinaldo Cervellati 《Helvetica chimica acta》2014,97(3):321-333
The intermittency or intermittent bursting as the type of dynamic state when two qualitatively different behaviors replace one another randomly during the course of the reaction, although all the control parameters remain constant, is found in the Briggs? Rauscher oscillating system moderated by a very small amount of phenol. Within a range of phenol concentrations, the oscillation amplitude is diminished considerably, and after oscillations cease, they repeat intermittently, giving several bursts of oscillations. For the concentrations used here, the range of phenol concentrations where intermittent bursting oscillations occur in a closed reactor is ca. 1.8×10?5 to 3.6×10?5 M . Bursting also occurs in an open reactor and can be sustained indefinitely at 5.53×10?5 M concentration. The intermittent bursting behavior is robust, and can be achieved at a variety of conditions. 相似文献
74.
75.
S. M. Blagojević S. R. Anić Ž. D. Čupić S. N. Blagojević Lj. Z. Kolar-Anić 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(13):2140-2145
By numerical calculations based on our previously proposed model with Br2O intermediate species we were able to simulate complex evolution of the Belousov-Zhabotinsky (BZ) reaction under batch conditions. In the defined region of initial malonic acid concentration [MA]0 (1.00 × 10?3 mol dm3 ≤ [MA]0 ≤ 1.50 mol dm?3) different sequences of regular and complex periodic and aperiodic oscillations were obtained. It is noticed that the bromine evaporation significantly affects the dynamics of the reaction. 相似文献
76.
77.
A. Z. Ivanović Ž. D. Čupić Lj. Z. Kolar-Anić M. M. Janković S. R. Anić 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(9):1526-1530
We applied multifractal analysis on time series obtained by deterministic simulation of the Bray-Liebhafsky oscillatory reaction. Large deviation spectrum was used to represent multifractal properties of the attractor. We obtained spectrums with two peaks, one in region of low and the other in region of high values of Hölder exponent. Their intensity depends on flow rate. The method developed on the results from numerical simulations is tested on the experimental record from the same reaction system and multifractality of the time series is confirmed. 相似文献
78.
Chairman of the International Organizing Committee of the Conference Slobodan Ani? Chairman of the Program Committee Ankica Anti?-Iovanovi? Vice-Chairman of the Local Organizing Committee ?eljko ?hupi? Deputy Editor-in-Chief of the Russian Journal of Physical Chemistry N.F. Stepanov 《Russian Journal of Inorganic Chemistry》2006,51(5):844-845
Chronicle
Zhurnal Neorganicheskoi Khimii (Inorganic Chemistry) is 50 相似文献79.
Nair V Deepthi A Poonoth M Santhamma B Vellalath S Babu BP Mohan R Suresh E 《The Journal of organic chemistry》2006,71(6):2313-2319
The zwitterion formed by the reaction of dimethoxycarbene and DMAD adds efficiently to one of the carbonyl groups of 1,2-dicarbonyl compounds and anhydrides to generate dihydrofurans and spirodihydrofurans in good yields. In many cases, the carbene inserts into the C-C bond of the dione to yield masked vicinal tricarbonyl systems. 相似文献
80.
The emergence of CAN as a versatile one-electron oxidant is attested by the wide range of reactions that can be executed by this reagent. The literature on CAN chemistry is updated in the present review while highlighting the reactions that make CAN an exceptional reagent. 相似文献