全文获取类型
收费全文 | 103篇 |
免费 | 4篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 8篇 |
建筑科学 | 3篇 |
矿业工程 | 2篇 |
能源动力 | 2篇 |
轻工业 | 17篇 |
无线电 | 1篇 |
一般工业技术 | 14篇 |
冶金工业 | 48篇 |
原子能技术 | 1篇 |
自动化技术 | 9篇 |
出版年
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2015年 | 2篇 |
2014年 | 1篇 |
2013年 | 4篇 |
2012年 | 4篇 |
2011年 | 7篇 |
2010年 | 4篇 |
2009年 | 5篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 6篇 |
2002年 | 2篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1968年 | 1篇 |
1963年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有107条查询结果,搜索用时 15 毫秒
51.
Julia R. Sanem Darin J. Erickson Patricia C. Rutledge Kathleen M. Lenk Toben F. Nelson Rhonda Jones-Webb Traci L. Toomey 《Accident; analysis and prevention》2015
All states in the U.S. prohibit alcohol-impaired driving but active law enforcement is necessary for effectively reducing this behavior. Sobriety checkpoints, saturation patrols, open container laws, and media campaigns related to enforcement efforts are all enforcement-related strategies for reducing alcohol-impaired driving. We conducted surveys of all state patrol agencies and a representative sample of local law enforcement agencies to assess their use of alcohol-impaired driving enforcement-related strategies and to determine the relationship between these enforcement-related strategies and self-reported alcohol-impaired driving behavior obtained from the Behavioral Risk Factor Surveillance System. We found that sobriety checkpoints, saturation patrols, and enforcement of open container laws were associated with a lower prevalence of alcohol-impaired driving but, more importantly, a combination of enforcement-related strategies was associated with a greater decrease in alcohol-impaired driving than any individual enforcement-related activity. In addition, alcohol-impaired driving enforcement-related strategies were associated with decreased alcohol-impaired driving above and beyond their association with decreased binge drinking. Results suggest law enforcement agencies should give greater priority to using a combination of strategies rather than relying on any one individual enforcement activity. 相似文献
52.
Zohrab Samani Ted Sammis Rhonda Skaggs N. Alkhatiri Jose Deras 《Canadian Metallurgical Quarterly》2005,131(6):555-559
Water is a limited resource in agricultural production in arid climates. Under such conditions, high irrigation efficiency can be obtained either through implementation of efficient irrigation systems such as drip or sprinkler systems or through the age-old practice of deficit irrigation with gravity systems. The method used to increase irrigation efficiency is often dictated by economic and/or social factors. In either case, the effectiveness of water management at the farm level needs to be evaluated by measuring irrigation efficiency. The objective of this study was to evaluate the irrigation efficiencies for three crops in Southern New Mexico using the chloride technique. The chloride technique is a simple method in which the natural chloride in the irrigation water is used as a tracer to estimate the leaching fraction and the irrigation efficiency at the farm level. Soil samples were collected from various fields in 15 cm increments to a depth of 180 cm at the end of the irrigation season. The samples were analyzed for moisture and chloride content. In addition to the chloride technique, on-farm irrigation efficiencies were measured using applied water, yield, and water production functions. Water production functions and yields were used to estimate total evapotranspiration while flow measurements were used to calculate the amount of applied water. The results showed that high irrigation efficiency can be accomplished using deficit irrigation. Irrigation efficiency values ranged from 83 to 98%. Irrigation efficiencies using the chloride technique were compared with efficiencies estimated from direct flow measurements. The differences between the two methods ranged from 2 to 11.4%. The results showed that even though the chloride technique is subject to sampling errors and simplified theoretical assumptions, it can be used to estimate on-farm irrigation efficiency with considerable accuracy. 相似文献
53.
54.
Pos Alberta E.; Greenberg Leslie S.; Goldman Rhonda N.; Korman Lorne M. 《Canadian Metallurgical Quarterly》2003,71(6):1007
This study explored the importance of early and late emotional processing to change in depressive and general symptomology, self-esteem, and interpersonal problems for 34 clients who received 16-20 sessions of experiential treatment for depression. The independent contribution to outcome of the early working alliance was also explored. Early and late emotional processing predicted reductions in reported symptoms and gains in self-esteem. More important, emotional-processing skill significantly improved during treatment. Hierarchical regression models demonstrated that late emotional processing both mediated the relationship between clients' early emotional processing capacity and outcome and was the sole emotional-processing variable that independently predicted improvement. After controlling for emotional processing, the working alliance added an independent contribution to explaining improvement in reported symptomology only. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
55.
Young Michael E.; Wasserman Edward A.; Hilfers MacKenzie A.; Dalrymple Rhonda 《Canadian Metallurgical Quarterly》1999,25(4):475
Pigeons previously trained to peck 1 button (same) after the successive presentation of 16 identical pictures and to peck a 2nd button (different) after the successive presentation of 16 nonidentical pictures were tested on lists involving different degrees of variability, different list lengths, and different temporal organizations of list items. The pigeons' performances on this successive same-different task revealed a strong sensitivity to list entropy; but, their discrimination was also affected by their memory for list items and by the accumulated evidence for a same versus a different response. Statistical models confirmed and quantified the importance of these additional factors. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
56.
Williams Rhonda; Doctor Jason; Patterson David; Gibran Nicole 《Canadian Metallurgical Quarterly》2003,48(3):189
Objective: To determine the evolution of health-related function in survivors of burn injuries. Design: Prospective cohort. Measure: Sickness Impact Profile (SIP). Participants: Adults who completed the SIP 1 month (n=237), 1 year (n=183), and 2 years (n=117) after burn injury. Results: Participants reported relatively low sickness impact compared with other medical populations within 1 year of injury. Overall health improved between 1 month and 1 year postinjury, after which it stabilized. Survivors reported worse psychosocial than physical function, regardless of age, gender, burn size, or days hospitalized. Conclusions: Most burn survivors can expect good physical recovery, even after large burn injuries. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
57.
Cornum Rhonda; Matthews Michael D.; Seligman Martin E. P. 《Canadian Metallurgical Quarterly》2011,66(1):4
The Comprehensive Soldier Fitness (CSF) program is designed to increase psychological strength and positive performance and to reduce the incidence of maladaptive responses of the entire U.S. Army. Based on the principles of positive psychology, CSF is a historically unique approach to behavioral health in a large (1.1 million members) organization. There are four program elements: (a) the assessment of emotional, social, family, and spiritual fitness; (b) individualized learning modules to improve fitness in these domains; (c) formal resilience training; and (d) training of Army master resilience trainers (MRTs) to instill better thinking skills and resilience in their subordinates. In contrast to traditional approaches, CSF is proactive; rather than waiting to see who has a negative outcome following stress, it provides ways of improving resilience for all members of the Army. CSF aims to move the full spectrum of responses to trauma and adversity—ranging from stress-related disorders to ordinary resilience—toward personal growth. This program may provide a model for implementing similar interventions in other very large institutions. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
58.
Glosser Guila; Friedman Rhonda B.; Roeltgen David P. 《Canadian Metallurgical Quarterly》1996,10(2):168
Controversies regarding the organization of the cognitive systems used for processing written language were investigated in a case study of a mentally retarded hyperlexic child. Despite severe impairments in semantic processing, this child demonstrated intact phonological and orthographic processing. Detailed assessments of his nonword reading abilities provided support for the hypothesis that phonological processing of written words was accomplished by using lexical representations instead of applying nonlexical grapheme-phoneme transcoding rules. Longitudinal investigation of the hyperlexic child's development of writing supports the notion that reading and spelling rely on common mental representations rather than separate input and output mental lexicons. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
59.
Mental health is defined in transactional terms, i.e., in terms of the intent of an individual towards equality or mutuality of achievement in relating to others. 4 levels of mutual achievement striving are described and a continuum composed of 8 varieties of intention-transactions is offered. Case histories of 64 patients admitted to a psychiatric hospital were examined to isolate events which could be evaluated in terms of the intention-transaction dimension. Each S was assigned a score on this continuum which reflected his degree of "mental health," and these scores were then compared to a measure of severity of mental illness (see 35: 6569), psychiatric diagnosis, type of treatment recommended, and outcome of treatment. Intention-transaction scores correlated positively with the variables. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
60.
Seaton Marjorie; Marsh Herbert W.; Craven Rhonda G. 《Canadian Metallurgical Quarterly》2009,101(2):403
For more than 2 decades, big-fish-little-pond effect (BFLPE) research has demonstrated that students in high-ability classes and schools have lower academic self-concepts than their equally able counterparts in mixed-ability schools. However, cross-cultural BFLPE research has been limited to mostly developed and individualist countries. Using the Program for International Student Assessment database (Organisation for Economic Co-operation and Development, 2005a, 2005b), the present investigation assessed the BFLPE in 41 culturally and economically diverse countries. In support of the BFLPE, the effect of school-average self-concept was negative for the total sample (effect size = ?.49), negative for each of the 41 countries considered separately, and statistically significant in 38 countries. In this large, culturally diverse sample of countries, the BFLPE was evident in both collectivist and individualist cultures and in economically developing and developed nations. Implications for BFLPE theory and educational practice are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献