全文获取类型
收费全文 | 166篇 |
免费 | 3篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 11篇 |
金属工艺 | 1篇 |
建筑科学 | 4篇 |
轻工业 | 29篇 |
无线电 | 6篇 |
一般工业技术 | 10篇 |
冶金工业 | 93篇 |
自动化技术 | 12篇 |
出版年
2022年 | 2篇 |
2020年 | 4篇 |
2018年 | 1篇 |
2014年 | 1篇 |
2013年 | 7篇 |
2012年 | 2篇 |
2011年 | 2篇 |
2010年 | 4篇 |
2009年 | 4篇 |
2008年 | 7篇 |
2007年 | 6篇 |
2006年 | 3篇 |
2005年 | 7篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 7篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1990年 | 5篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 4篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 3篇 |
1964年 | 1篇 |
1961年 | 1篇 |
1959年 | 1篇 |
1953年 | 1篇 |
排序方式: 共有169条查询结果,搜索用时 31 毫秒
31.
Ohr Phyllis S.; Vidair Hilary B.; Gunlicks-Stoessel Meredith; Grove Allen B.; La Lima Candice 《Canadian Metallurgical Quarterly》2010,24(5):625
This article presents an in vivo investigation of maternal negative mood, maternal video-mediated cognitions, and daily stressors in families with young children. Specifically, it was hypothesized that greater levels of maternal depressed, anxious, and hostile mood states immediately prior to a daily, reportedly routine, stressful parent–child interaction would be significantly associated with higher percentages of dysfunctional and lower percentages of functional cognitions. Forty-five mothers of 2- to 5-year-old children participated in this study by rating their mood before being videotaped in a daily routine with their child they reported as recurrent and stressful (e.g., mealtime). Using video-mediated recall (VMR) methodology, mothers were instructed to recall their cognitions upon immediate video review. Results indicated that greater levels of negative mood were associated with a greater percentage of dysfunctional cognitions and a smaller percentage of functional cognitions. Levels of maternal depressed mood were significantly and independently associated with greater rates of dysfunctional and lower rates of functional cognitions. Negative mood states were not consistently associated with the amount of maternal self-reported general irrationality, pointing to the utility of the VMR to elicit maternal cognitions specific to the observed interaction, which may have more implications for clinical intervention than more general irrationality measures. Evaluating maternal mood and using video-mediated maternal cognitions regarding daily family stressors can precipitate clinical interventions meant to reduce family-related stress and potentially improve maternal and child mental health outcomes. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
32.
33.
Zbigniew Pietrasik Jagvinder S. Dhanda Phyllis J. Shand Ronald B. Pegg 《Journal of food science》2006,71(2):S110-S118
The combined effects of injection, packaging (modified atmosphere packaging [MAP] with 70% O2/ 30% CO2 and vacuum packaging [VP]), storage temperature (‐1 °C and +4 °C), and storage time on the color, microbial and oxidative stability of beef and bison longissimus lumborum (LL) steaks were investigated. Beef LL steaks in MAP retained their bright red color longer than bison steaks. Bison steaks developed higher 2‐Thiobarbituric acid reactive substances (TBARS) during storage, and this might have influenced the resulting rapid loss of redness from the bloomed meat. Storage at ‐1 °C in MAP provided greater color stability and a longer storage life for both meat species studied. Injection of salt/phosphate had a beneficial effect on the color stability of steaks during retail display; however, this positive effect was more pronounced for bison steaks compared with those of beef. Steaks stored overnight under MAP before retail display maintained the highest a* values for up to 5 d compared with those stored under vacuum. MAP‐OV steaks generally maintained the highest OMB content for up to 5 d during retail display compared with those stored under vacuum. Nevertheless, OMB levels were significantly (P < 0.05) lower in bison steaks compared with those of beef irrespective of packaging treatments. Injected steaks and those stored at ‐1 °C had significantly (P < 0.05) higher OMB levels compared with non‐injected counterparts and those stored at +4 °C, respectively. MAP is an excellent option for short‐term storage due to its positive effects on meat color, but for longer storage, VP may be necessary. Storing meat under vacuum and then placing it under MAP just before retail display might be another option to increase shelf life. 相似文献
34.
Administered the Job Diagnostic Survey, the Tennessee Self-Concept Scale, and measures of job complexity, job performance, and sense of competence to 166 15–22 yr old 1st-, 2nd-, 3rd-, and 4th-yr electrical apprentices. The measures were readministered 20 mo later to 92 of the original 1st- and 2nd-yr Ss to investigate the moderating influence of employee self-esteem on relationships between organizational variables. Analysis showed that global self-esteem and sense of competence did not moderate relationships between (1) job satisfaction and job performance and (2) job complexity and job performance or job satisfaction. It is suggested that the moderating effect of self-esteem on relationships involving job satisfaction, performance, and complexity may have little practical consequence. (39 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
35.
Wigfield Allan; Eccles Jacquelynne S.; Yoon Kwang Suk; Harold Rena D.; Arbreton Amy J. A.; Freedman-Doan Carol; Blumenfeld Phyllis C. 《Canadian Metallurgical Quarterly》1997,89(3):451
The authors assessed change over 3 years in elementary school children's competence beliefs and subjective task value in the domains of math, reading, instrumental music, and sports. The longitudinal sample consisted of approximately 615 mostly White, lower middle to middle-class children. Stability correlations indicated moderate to strong stability in children's beliefs, especially older children's competence beliefs. The relation of children's ratings of their competence in each domain to estimates of their competence in those domains provided by both parents and teachers increased over the early elementary grades. Children's competence beliefs and ratings of the usefulness and importance of each activity decreased over time. Children's interest in reading and instrumental music decreased, but their interest in sports and math did not. Gender differences in children's competence beliefs and subjective task values did not change over time. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
36.
Examined hemispheric differences in processing tachistoscopically presented faces in 8-, 11-, and 13-yr-old children of above-average intelligence. Ss viewed 4 female faces and were then asked to point to the face presented on each trial. The finding of a bimodal distribution of error scores among those Ss who showed a left visual-field (LVF) advantage supports the view that there are 2 types of information processing associated with the right hemisphere. The error scores of the younger Ss with an LVF advantage were unimodal and those of the 13-yr-olds bimodal. This bimodality characterized only the older girls. Since the unimodal error scores for the younger Ss were at a relatively high level, the data were interpreted as indicating that younger children and males at all ages use a diffuse right-hemisphere processing strategy in recognizing faces, whereas some older females use a more integrated right-hemisphere strategy. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
37.
Interactions between iron deficiency and lead poisoning: epidemiology and pathogenesis 总被引:7,自引:0,他引:7
Iron deficiency and lead poisoning are common among infants and children in many parts of the world, and often these two problems are associated. Both conditions are known to cause anemia and appear to produce a more severe form of anemia when in combination. Although the nature of their relationship is not completely elucidated, characterization of a common iron-lead transporter and epidemiological studies among children strongly suggest that iron deficiency may increase susceptibility to lead poisoning. Recent human studies suggest that high iron intake and sufficient iron stores may reduce the risk of lead poisoning. Future clinical trials are necessary to assess the effect of iron supplementation in the public health prevention of lead poisoning and the kinetics of lead in the body. 相似文献
38.
The binomial group-testing problem is extended to the case in which the common probability p of a unit being defective is unknown. A Bayes “non-mixing” procedure R (1) is derived and compared with other procedures, in particular with the corresponding procedure R 1 that requires the knowledge of p and with another procedure based on continually revising the maximum likelihood estimate of p; the latter is called an empirical Bayes solution. Finally, a Bayes procedure derived in the Appendix allows “mixing” and this is conjectured to be the unrestricted Bayes solution; the improvements due to “mixing” are shown to be small in Table III. Several applications of the general problem of group-testing are discussed in the introduction and this virtually constitutes a general review of the subject. After the procedure R (1) is defined a detailed illustration is given in section 2.1 showing how to carry out this procedure with the use of Tables I and II. Lower bounds for the Bayes risk associated with any group testing procedure for unknown p are given in Table III; one of these bounds, based on information theory, is derived in section 4. 相似文献
39.
Although family psychoeducation has been shown to be highly efficacious in the treatment of schizophrenia, the mechanisms underlying the treatment's success are poorly understood. The therapeutic alliance in behavioral family management (BFM) was examined to determine whether the alliance plays a role in the efficacy of this treatment. One early BFM session (mean session = 6.5) involving 28 schizophrenia patients and their relatives who participated in the National Institute of Mental Health's Treatment Strategies in Schizophrenia study was coded using the System for Observing Family Therapy Alliances. Results indicated that when relatives developed a positive therapeutic alliance, patients were less likely to show prodromal signs of relapse and be rehospitalized over a 2-year follow-up period. When patients developed a positive alliance, relatives became less rejecting and were less likely to feel burdened over a 2-year period. The data suggest that the development of a positive therapeutic alliance within family psychoeducation may play an important role in preventing the escalation of psychotic symptoms and improving family relationships. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
40.