全文获取类型
收费全文 | 1778篇 |
免费 | 10篇 |
专业分类
电工技术 | 5篇 |
综合类 | 1篇 |
化学工业 | 80篇 |
金属工艺 | 3篇 |
机械仪表 | 2篇 |
建筑科学 | 5篇 |
能源动力 | 2篇 |
轻工业 | 43篇 |
无线电 | 35篇 |
一般工业技术 | 50篇 |
冶金工业 | 1499篇 |
自动化技术 | 63篇 |
出版年
2021年 | 4篇 |
2018年 | 4篇 |
2016年 | 9篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 12篇 |
2012年 | 17篇 |
2011年 | 11篇 |
2010年 | 13篇 |
2009年 | 12篇 |
2008年 | 11篇 |
2007年 | 13篇 |
2006年 | 8篇 |
2005年 | 5篇 |
2004年 | 11篇 |
2003年 | 16篇 |
2002年 | 9篇 |
2001年 | 7篇 |
2000年 | 7篇 |
1999年 | 60篇 |
1998年 | 490篇 |
1997年 | 235篇 |
1996年 | 166篇 |
1995年 | 102篇 |
1994年 | 68篇 |
1993年 | 76篇 |
1992年 | 28篇 |
1991年 | 21篇 |
1990年 | 19篇 |
1989年 | 21篇 |
1988年 | 19篇 |
1987年 | 16篇 |
1986年 | 29篇 |
1985年 | 22篇 |
1984年 | 11篇 |
1983年 | 13篇 |
1982年 | 15篇 |
1981年 | 14篇 |
1980年 | 11篇 |
1979年 | 6篇 |
1978年 | 9篇 |
1977年 | 35篇 |
1976年 | 65篇 |
1975年 | 6篇 |
1974年 | 7篇 |
1972年 | 4篇 |
1971年 | 3篇 |
1969年 | 6篇 |
1964年 | 3篇 |
1963年 | 3篇 |
排序方式: 共有1788条查询结果,搜索用时 0 毫秒
991.
992.
78 students enrolled in summer-session college courses were randomly assigned to serve either as counselors or as clients for a 20-min, role-played peer counseling session. Ss completed a battery of standardized personality measures, including the Personality Research Form. Each counselor interacted with 2 clients. Prior to the sessions, the counselor was led to believe that one of the clients was especially introverted and that the other client was especially extraverted. Dependent measures were based on clients' change scores on a mood adjective rating scale administered before and after the peer counseling sessions. Analyses showed that counselors who were more successful at biasing their clients in the direction of their expectancies (a) scored higher on measures of dogmatism, nurturance, and social recognition; (b) scored lower on impulsivity; and (c) were more likely to be female. Clients who were more susceptible to counselor bias scored higher on the Self-Monitoring Scale, its Other-Directedness subscale, and social recognition. (32 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
993.
994.
NE Stathakis TC Economopoulos AG Papayannis D Thomopoulos 《Canadian Metallurgical Quarterly》1977,34(3):215-222
In 10 patients with Behcet's syndrome, various parameters of platelet function, blood coagulation and fibrinolysis were studied. With varying frequency the following abnormalities were found: increased retention of platelets in glass bead column, reduced platelet aggregation to low concentrations of adenosine diphosphate, elevated plasma levels of fibrinogen concentration and factor VIII activity, increased plasma antiheparin activity and impairment of fibrinolytic activity. The above abnormalities were found long after the last thrombotic episode and were more frequent in patients with a history of thrombophlebitis. It is suggested that certain hemostatic abnormalities accompany or form part of Behcet's syndrome and that they are related to the thrombotic complications characteristic of this syndrome. 相似文献
995.
996.
A study of heterogeneity among muscarinic receptors was carried out with new rigid molecules, comprising structures in the fused quinuclidine-valerolactone, quinuclidine-cyclohexenone, quinuclidine-cyclohexanone and quinuclidine-cyclohexane derivatives. These are structurally related to the potent muscarinic agent, 3-acetoxyquinuclidine but substantially different from in it conformation. All proved to antagonize acetylcholine-like activity, but to a different extent in different systems. The equipotent molar ratio with respect to atropine (as 1) was: isolated guinea pig ileum, 10,000-1,000; salivary gland (mouse), 1,000-100; superior cervical ganglion (cat), 100-10; CNS (mouse), approximately 10. It is suggested that the rigid structure induces a three-point constrained fit in the receptor (onium group, hydrophobic moiety and carbonyl group), but that not all muscarinic receptors are capable of responding equally. In this case, receptor specificity of the drug is a direct consequence of its graded departure from the preferred conformation of acetycholine and, therefore, is necessarily associated with partial loss of potency. 相似文献
997.
TC Bond 《Canadian Metallurgical Quarterly》1976,133(11):1328-1331
The author studied 28 men convicted and confined for use of explosives in assaults on superior officers during the Viet Nam war. There were several predominant characteristics in this group, including deprivation and/or brutality in family backgrounds, poor self-image, lack of critical self-observation, the use of externalization, and feelings of insecurity or vulnerability. Drug use joined with these and several other factors related to the situation of these men in Viet Nam in a lethal combination that led to the perpetration of an indirect assault with an explosive device on a figure perceived as powerful and threatening. 相似文献
998.
Outlined procedures for assessing the heterogeneity of a set of effect sizes derived from a meta-analysis, testing for trends with contrasts among the effect sizes obtained, and evaluating the practical importance of the average effect size obtained. These procedures were applied to data presented by J. S. Hyde (1981) regarding cognitive gender differences. The authors conclude that (a) for all 4 areas of cognitive skill investigated, effect sizes for gender differences differed significantly across studies; (b) recent studies of gender differences show a substantial gain in cognitive performance by females relative to males; and (c) studies of gender differences show male vs female effect sizes of practical importance equivalent to outcome rates of 60 vs 40%. (6 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
999.
1000.
Investigated the effects of experimenter physical attractiveness and attire in same- and mixed-sex dyads. Six male and 6 female experimenters interacted with 30 male and 30 female undergraduate Ss. Each experimenter saw 1 male and 1 female while well-dressed and 1 male and 1 female while casually dressed. A vocabulary test and a photo-rating task were administered to Ss by experimenters in each meeting. Later, Ss completed the Adjective Check List (ACL) to indicate how they perceived the experimenter. Results show that experimenters in opposite-sex dyads received higher positivity ratings on the ACL; these ratings were also differentially affected by experimenters' sex and physical attractiveness, although no main effect for experimenter physical attractiveness was significant. Findings suggest the need for a more integrated, multivariable approach to interpersonal behavior. (41 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献