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11.
A. A. Kulko N. K. Skobelev V. Kroha V. Burjan Z. Hons A. V. Daniel N. A. Demekhina R. Kalpakchieva A. Kugler J. Mrázek Yu. E. Penionzhkevich Š. Piskoř Yu. G. Sobolev E. Šimečková 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(4):538-543
Experimental excitation functions are presented for 45Sc(d, p)46Sc, 45Sc(d, t)44Sc, 45Sc(6He, 5He*)46Sc and 45Sc(6He, α)47Sc reactions at projectile energies near the Coulomb barrier. The obtained excitation functions for reactions 45Sc(d, p)46Sc and 45Sc(6He, 5He*)46Sc have similar behavior and have a maxima near the Coulomb barriers of these reactions. The compilation of the available experimental data, obtained at deuteron- and 6He-energies near the Coulomb barrier, showed that the values of the cross sections at the maxima of the excitation functions obtained in (d, p) reactions and the reactions for one-neutron pickup from the 6He projectiles have a different Z-dependence. 相似文献
12.
A proposed connection between current and constituent quarks is discussed and tested through comparison with the magnitudes and signs of amplitudes for pionic transitions between hadrons. 相似文献
13.
E. W. Fischer K. Hahn J. Kugler U. Struth R. Born M. Stamm 《Journal of Polymer Science.Polymer Physics》1984,22(8):1491-1513
A new method for the evalution of neutron scattering data from semicrystalline polymers is proposed for small and intermiediate q [q = (4π/λ)sinθ/2]. It is based on the assumption that, in general, a molecule cryustallizes in various lamellae. Within one lamella the crystalline stems connected by loop or folds from intramolecular “clusters,” which are connected by tie molecules. Without further assumptions the method yields in a straightforward manner the following quantities: (i) the average number of clusters per molecule, from which the number of tie molecules can be estimated; (ii) the radius of gyration <R> of the centers of the stems belonging to one cluster; and (iii) the radius of gyration <R> of the cluster centers with respect to the center of the molecule the method was successfully tested using experimental data obtained from poly(ethylene oxide), polyethylene, and isotactic polypropylene. 相似文献
14.
Dr. Jan Nekvinda Michael Kugler Dr. Josef Holub Dr. Suzan El Anwar Dr. Jiří Brynda Klára Pospíšilová Dr. Zdeňka Růžičková Dr. Pavlína Řezáčová Dr. Bohumír Grüner 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(69):16541-16553
Carbonic anhydrase IX (CA IX), a tumor-associated metalloenzyme, represents a validated target for cancer therapy and diagnostics. Herein, we report the inhibition properties of isomeric families of sulfonamidopropyl-dicarba-closo-dodecaboranes group(s) prepared using a new direct five-step synthesis from the corresponding parent cages. The protocol offers a reliable solution for synthesis of singly and doubly substituted dicarba-closo-dodecaboranes with a different geometric position of carbon atoms. The closo-compounds from the ortho- and meta-series were then degraded to corresponding 11-vertex dicarba-nido-undecaborate(1−) anions. All compounds show in vitro enzymatic activity against CA IX in the low nanomolar or subnanomolar range. This is accompanied by clear isomer dependence of the inhibition constant (Ki) and selectivity towards CA IX. Decreasing trends in Ki and selectivity index (SI) values are observed with increasing separation of the cage carbon atoms. Interactions of compounds with the active sites of CA IX were explored with X-ray crystallography, and eight high-resolution crystal structures uncovered the structural basis of inhibition potency and selectivity. 相似文献
15.
V. Yu. Alexakhin M. I. Gostkin K. K. Gudima M. P. Ivanov A. Kugler I. V. Kuznetsov S. I. Merzlyakov C. L. Morris E. A. Pasyuk Yu. E. Penionzhkevich S. Yu. Porokhovoy Yu. G. Sobolev V. D. Toneev 《Physics of Atomic Nuclei》2000,63(10):1673-1678
The inclusive energy spectra and multiplicities of p, d, and t from the reactions 14N(Ag, X), X=p, d, t at E/A=52 MeV are measured. The experimental data are compared with the results obtained within the Dubna version of the cascade model and are analyzed on the basis of the moving-source model. 相似文献
16.
还原态Mo-Ni-K/C催化剂上CO加氢合成低碳混合醇 总被引:1,自引:0,他引:1
CO加氢合成低碳混合醇已成为C1化学的一个重要分支.目前用于这一过程的催化剂大都是改性的甲醇合成、FT合成或二者组合的催化剂.自从80年代中期美国Dow化学品公司和联合碳化物公司首先发现MoS2基催化剂具有优良的催化合成醇反应性能和良好的抗硫中毒能... 相似文献
17.
N. K. Skobelev Yu. E. Penionzhkevich E. I. Voskoboinik V. Kroha V. Burjan Z. Hons J. Mrázek Š. Piskoř E. Šimečkova A. Kugler 《Physics of Particles and Nuclei Letters》2014,11(2):114-120
In experiments performed by accelerated ion 3He-beam irradiated gold and platinum targets on the cyclotron U-120M of the Nuclear Physics Institute of the Czech Academy of Sciences, ?e?, reactions of complete and incomplete fusion and nucleon transfer reactions in the 3He energy range from 10 to 24.5 MeV have been investigated. To determine the yield of the nuclides resulting from the nuclear reaction, the activation technique has been used. The obtained data are analyzed using models based on statistical calculations and compared with similar results for other light stable particles. Transfer reactions with positive Q values have relatively high cross sections in the energy range below the Coulomb barrier. These cross sections continue to grow with increasing 3He energy, and, in the case of capturing neutron from target nucleus by a nucleus of 3He, the excitation functions of these reactions reach their maximum almost at the Coulomb barrier of the reactions. 相似文献
18.
Sándor Kugler 《Journal of Non》2012,358(17):2060-2062
The tight-binding molecular dynamics simulations and reverse Monte Carlo structural modeling method were applied in order to investigate the existence of small bond angles (like those in triangles and squares) in amorphous silicon networks. The influence of small bond angles on the electronic density of states was analyzed. The presence of a number of smaller bond angles is necessary for a proper reproduction of the neutron diffraction data of amorphous silicon. Semiempirical Hartree–Fock calculations show that these arrangements provide higher energy levels in electronic density of states which are localized on these local structures. Accepting this result we must reconsider the electronic density of states of amorphous semiconductors. The localized mobility gap has structure i.e. two characteristic peaks can be found inside the tail. First larger peak belongs to the squares while the peak at larger energy is formed by triangles. 相似文献
19.
The existence of small bond angles (like those of triangles and squares) in amorphous silicon networks were studied by the tight-binding molecular dynamics method, by analyzing the statistical data of Si-Si-Si fragments inside large molecules, and also by the Reverse Monte-Carlo simulation method. The influence of small bond angles on the electronic density of states was revealed. 相似文献
20.
F. Křížek V. Wagner J. Adam P. Čaloun V. Henzl D. Henzlová A. Krása A. Kugler M. Majerle M. I. Krivopustov V. I. Stegailov V. M. Tsoupko-Sitnikov 《Czechoslovak Journal of Physics》2006,56(3):243-252
The Neutron Activation Analysis Method was used to study neutron field in a setup consisting of a thick lead target and a
natural uranium blanket. This setup was exposed to 1.5 GeV proton beam from the Nuclotron accelerator. By means of gamma-ray
spectroscopic measurements we determined the yields of various nuclear reactions induced in the radio-chemical sensors. The
data obtained were then compared with the results of a MCNPX simulation. 相似文献