全文获取类型
收费全文 | 77篇 |
免费 | 5篇 |
专业分类
化学工业 | 15篇 |
机械仪表 | 3篇 |
建筑科学 | 5篇 |
水利工程 | 1篇 |
无线电 | 8篇 |
一般工业技术 | 18篇 |
冶金工业 | 29篇 |
自动化技术 | 3篇 |
出版年
2024年 | 1篇 |
2016年 | 4篇 |
2014年 | 1篇 |
2013年 | 7篇 |
2012年 | 1篇 |
2011年 | 8篇 |
2010年 | 1篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 1篇 |
2006年 | 2篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1997年 | 8篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 5篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1980年 | 3篇 |
1978年 | 1篇 |
1976年 | 3篇 |
1974年 | 1篇 |
1972年 | 2篇 |
1965年 | 1篇 |
排序方式: 共有82条查询结果,搜索用时 265 毫秒
51.
52.
KD Schultz J Furkert A O''Connor M B?ttcher M Schmidt CR Baumgarten G Kunkel 《Canadian Metallurgical Quarterly》1996,30(2):117-124
Depending on the cell type studied, the involvement of type II transglutaminase (TGase) has been proposed in almost any event of the cell life such as differentiation, apoptosis, growth, aging, cell morphology and adhesion, metastatic capacity or extracellular matrix stabilization. In order to define the field(s) where this enzyme may be implicated in chondrocytes, type II TGase expression was studied in chondrocytes at different passages which differentiated state was modulated by retinoic acid, dihydrocytochalasin B or staurosporin. Results showed that (i) type II TGase expression is not incompatible with type II collagen expression, a main marker of chondrocyte differentiation (ii) type II TGase expression is higher when cells are in the exponential phase of growth than when growth arrested (iii) a high type II TGase expression does not imply that cells are apoptotic although cell apoptosis correlates with increased type II TGase expression (iv) non-adherent cells do not express type II TGase whereas adherent cells do whatever their differentiation state as assessed by type II collagen synthesis. These results suggest that, in articular chondrocytes, type II TGase is specifically implicated in the cell adhesion capacity. 相似文献
53.
C Madhu S Duff V Baumgarten P Rix D Small D Tang-Liu 《Canadian Metallurgical Quarterly》1997,86(8):972-974
Tazarotene is a novel acetylenic retinoid for the treatment of psoriasis and acne. We examined (1) the hydrolysis of tazarotene in blood from Japanese-American and Caucasian subjects, (2) the esterases responsible for this hydrolysis in human blood, and (3) tazarotene hydrolysis in rat and human liver microsomes. Tazarotene hydrolysis and enzyme inhibition were assessed by monitoring the disappearance of tazarotene and the appearance of its primary metabolite tazarotenic acid by HPLC. In blood, tazarotene was converted mainly to tazarotenic acid via first-order kinetics, and there was no statistically significant difference in the hydrolytic (metabolic) rate of tazarotene in uninhibited Japanese-American and Caucasian blood. Physostigmine (a cholinesterase inhibitor), bis(p-nitrophenyl) phosphate (a carboxylesterase inhibitor), and EDTA (an aromatic esterase inhibitor) did not significantly affect tazarotene hydrolysis in blood. Paraoxon, an inhibitor of all serine esterases including cholinesterase and carboxylesterase, decreased the hydrolysis of tazarotene to tazarotenic acid by 95% in both blood and liver microsomes. In conclusion, blood and liver esterases play a significant role in the hydrolysis of tazarotene to tazarotenic acid, and paraoxon-inhibitable forms of esterases are involved in this hydrolysis in humans. 相似文献
54.
55.
Two subjects were rotated eccentrically in the manner described previously. In contrast to a normal control group, settings of a luminous line to the subjective vertical were almost unrelated to the gravitoinertial vector before, and totally so shortly after, space flight. Only 3 days postflight did a clear relation to the gravitoinertial vector re-establish itself in the one subject who actually flew. The correspondence became normal 5 days after the flight. Since there were no clinical abnormalities evident in the subjects, it is suggested that both subjects suppressed their vestibular information, presumably as an effect of vestibular deconditioning training before the flight. In addition, as a consequence of the flight experience one subject continued to ignore it several days after the flight. 相似文献
56.
57.
58.
E. El-Magd Y. Ismail G.-J. Brockmann J. Baumgarten 《Materialwissenschaft und Werkstofftechnik》1997,28(1):34-39
The effect of small percentages of Al4C3 and Al2O3 in dispersion hardened aluminium on the creep behaviour has been investigated. A comparative study was conducted on the group of AlC3Ol and AlC2O2. These two groups were produced by cold isostatic pressing (CIP), but the second group was produced by four several methods of powder forming processes. Creep rupture properties in these alloys were characterized in terms of the stress and temperature dependence of minimum creep strain rate εmin, rupture lives tR and creep rate parameter α. Within the stress ranges used in this work, the stress dependence of both εmin and tR at various temperatures of these groups can be represented by power laws: . 相似文献
59.
Baumgarten C Barchetti A Einenkel H Goetz D Schmelzbach PA 《The Review of scientific instruments》2011,82(5):053304
A compact electron cyclotron resonance proton source has been developed and installed recently at the Paul Scherrer Institute's high intensity proton accelerator. Operation at the ion source test stand and the accelerator demonstrates a high reliability and stability of the new source. When operated at a 10-12 mA net proton current the lifetime of the source exceeds 2000 h. The essential development steps towards the observed performance are described. 相似文献
60.
MA Wood RA Mangano RM Schieken CM Baumgarten PM Simpson KA Ellenbogen 《Canadian Metallurgical Quarterly》1996,94(6):1465-1470
BACKGROUND: Single-site or multisite atrial pacing may reduce the incidence of atrial fibrillation in humans. The therapeutic mechanisms may include synchronization of atrial repolarization (repolarization "memory") and/or decreased dispersion of atrial repolarization. These responses have not been well documented in intact atria. METHODS AND RESULTS: Monophasic action potential recordings were made from six atrial epicardial sites in 39 isolated perfused rabbit heart preparations during 3 hours of continuous right atrial, left atrial, or biatrial pacing. Action potential recordings obtained at times 0, 45, 90, 135, and 180 minutes were computer analyzed for activation time (AT) and 90% action potential duration (APD) at each site. No consistent relationship could be demonstrated between APD and AT at any time during atrial pacing (all P > .05). On average, left atrial APDs were longer than right atrial APDs by up to 6.3 ms at all times, regardless of the site of pacing (P < or = .05). At all times, dispersion of atrial repolarization was minimized by left atrial pacing compared with right atrial pacing (21.6 +/- 9.1 versus 32.4 +/- 15.1 ms, respectively, at time 0; P < .05). Biatrial pacing provided no further reduction in dispersion of repolarization compared with left atrial pacing (all P > .05). CONCLUSIONS: No relationship can be demonstrated between atrial AT and APD in the isolated rabbit heart preparation. This differs from ventricular repolarization "memory," which is demonstrable under the same conditions. Left atrial APD is, on average, longer than right atrial APD, suggesting spatial heterogeneity in repolarization. Dispersion of atrial repolarization is minimized by left atrial pacing in this preparation with no further advantage to biatrial pacing. 相似文献