全文获取类型
收费全文 | 83篇 |
免费 | 0篇 |
专业分类
化学 | 46篇 |
数学 | 4篇 |
物理学 | 33篇 |
出版年
2023年 | 1篇 |
2020年 | 2篇 |
2018年 | 1篇 |
2016年 | 1篇 |
2013年 | 2篇 |
2012年 | 4篇 |
2011年 | 6篇 |
2010年 | 3篇 |
2009年 | 3篇 |
2008年 | 3篇 |
2007年 | 4篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 5篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1993年 | 4篇 |
1990年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1977年 | 4篇 |
1976年 | 1篇 |
1933年 | 2篇 |
1930年 | 1篇 |
1925年 | 2篇 |
1886年 | 2篇 |
1869年 | 1篇 |
1868年 | 2篇 |
1867年 | 5篇 |
1865年 | 1篇 |
排序方式: 共有83条查询结果,搜索用时 31 毫秒
1.
J. S. Stas 《Fresenius' Journal of Analytical Chemistry》1886,25(1):288-292
Ohne Zusammenfassung 相似文献
2.
Alexopoulos T Allen C Anderson EW Areti H Banerjee S Beery PD Biswas NN Bujak A Carmony DD Carter T Cole P Choi Y De Bonte RJ Erwin AR Findeisen C Goshaw AT Gutay LJ Hirsch AS Hojvat C Kenney VP Lindsey CS LoSecco JM McMahon T McManus AP Morgan N Nelson KS Oh SH Piekarz J Porile NT Reeves D Scharenberg RP Stampke SR Stringfellow BC Thompson MA Turkot F Walker WD Wang CH Wesson DK 《Physical review letters》1990,64(9):991-994
3.
The determination of uranium in liquid samples using energy dispersive X-ray fluorescence was investigated. The organic phase di-(2-ethyl hexyl) phosphoric acid and trioctyl phosphine oxide (D2EHPA-TOPO)/kerosene, which resulted from first and second cycles of uranium extraction from commercial phosphoric acid, was directly analyzed using 109Cd as a primary excitation source. Copper was used as an internal standard, which led to a linear relation between relative intensity of uranium and its concentration. Three calibration curves, 0–100, 100–1000 and 1000–6500 g· ml–1, according to uranium concentration in the studied samples, were constructed. The effect of different molarities of D2EHPA and TOPO was considered. The detection limit, precision and accuracy were 1.1 g · ml–1, 3% and 1.4%, respectively. The obtained results were compared with other techniques such as -ray spectroscopy, UV spectrometry and volumetry. 相似文献
4.
Lazarus EA Navratil GA Greenfield CM Strait EJ Austin ME Burrell KH Casper TA Baker DR DeBoo JC Doyle EJ Durst R Ferron JR Forest CB Gohil P Groebner RJ Heidbrink WW Hong R Houlberg WA Howald AW Hsieh C Hyatt AW Jackson GL Kim J Lao LL Lasnier CJ Leonard AW Lohr J La Haye RJ Maingi R Miller RL Murakami M Osborne TH Perkins LJ Petty CC Rettig CL Rhodes TL Rice BW Sabbagh SA Schissel DP Scoville JT Snider RT Staebler GM Stallard BW Stambaugh RD St John HE Stockdale RE Taylor PL Thomas DM 《Physical review letters》1996,77(13):2714-2717
5.
6.
7.
Abstract Cascade size may affect phase stability under irradiation because of two distinct contributions: the replacement to displacement cross-section ratio depends on the deposited energy density; ballistic jumps which tend to disorder ordered compounds occur by bursts, while thermal jumps which restore long range order occur one by one. The latter effect cannot be handled by standard rate theory. A stochastic treatment of the problem, based on a Fokker Planck approximation of the relevant master equation is summarized. It is shown that the possible values of the long range order parameter under irradiation are not affected by the size of the cascade but that the respective stability of the former is cascade size sensitive. As a consequence, the stability diagram of phases under irradiation varies with the size of the cascades. A numerical example of this is given for the B2 structure. 相似文献
8.
Maud Jenart Claude Niebel Jean-Yves Balandier Julie Leroy Alix Mignolet Sara Stas Antoine Van Vooren Jérôme Cornil Yves Henri Geerts 《Tetrahedron》2012,68(1):349-355
Two quaterthiophene-based dimers including an ethylene bridge have been designed and efficiently prepared; experimental and computational studies show a promising potential as semiconducting material with a charge transport of higher dimensionality compared to quaterthiophene. 相似文献
9.
Dr. Chandi C. Malakar Dr. Sara Stas Prof. Dr. Wouter Herrebout Prof. Dr. ir. Kourosch Abbaspour Tehrani 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(42):14263-14270
A variety of N‐alkyl‐α,α‐dichloroaldimines were vinylated by terminal acetylenes in the presence of Lewis acids such as In(OTf)3 or BF3 ? OEt2 and hexafluoroisopropanol (HFIP) as an additive. The reaction proceeds at ambient temperature and leads to geometrically pure allylic β,β‐dichloroamines. This approach is complementary to previously reported transition‐metal‐catalyzed vinyl‐transfer methods, which are not applicable to aliphatic imines and are restricted to imines that contain an electron‐withdrawing nitrogen substituent. In the present approach, terminal alkynes were used as a source of the vinyl residue, and the N‐alkyl moiety of the imine acts as a sacrificial hydrogen donor. The additional advantage of this methodology is the fact that no external toxic or hazardous reducing agents or molecular hydrogen has to be used. This new methodology nicely combines a C(sp2)? C(sp) bond formation, hydride transfer, and an unusual cleavage of an unactivated C? N bond, thereby giving rise to functionalized primary allylic amines. A detailed experimental study supported by DFT calculations of the mechanism has been done. 相似文献
10.
The functions of the main indices of refraction n(ν) and absorption κ(ν) of uniaxial thin polyethylene terephthalate films
have been calculated by the experimental spectra of frustrated total reflection of s-and p-polarized radiation in the 700–760-cm−1 range. The κo(ν) maximum falls at the the 727-cm−1 frequency and the maximum of κe(ν) falls at the the 724-and 732-cm− 1 frequencies.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 756–759, November–December, 2005. 相似文献