全文获取类型
收费全文 | 2597篇 |
免费 | 142篇 |
国内免费 | 65篇 |
专业分类
电工技术 | 55篇 |
综合类 | 275篇 |
化学工业 | 220篇 |
金属工艺 | 41篇 |
机械仪表 | 251篇 |
建筑科学 | 146篇 |
矿业工程 | 13篇 |
能源动力 | 13篇 |
轻工业 | 136篇 |
水利工程 | 5篇 |
石油天然气 | 18篇 |
武器工业 | 8篇 |
无线电 | 96篇 |
一般工业技术 | 218篇 |
冶金工业 | 843篇 |
原子能技术 | 5篇 |
自动化技术 | 461篇 |
出版年
2024年 | 6篇 |
2023年 | 12篇 |
2022年 | 80篇 |
2021年 | 94篇 |
2020年 | 48篇 |
2019年 | 99篇 |
2018年 | 64篇 |
2017年 | 45篇 |
2016年 | 43篇 |
2015年 | 49篇 |
2014年 | 87篇 |
2013年 | 129篇 |
2012年 | 102篇 |
2011年 | 167篇 |
2010年 | 149篇 |
2009年 | 204篇 |
2008年 | 170篇 |
2007年 | 180篇 |
2006年 | 175篇 |
2005年 | 190篇 |
2004年 | 131篇 |
2003年 | 115篇 |
2002年 | 93篇 |
2001年 | 72篇 |
2000年 | 29篇 |
1999年 | 23篇 |
1998年 | 18篇 |
1997年 | 28篇 |
1996年 | 15篇 |
1995年 | 16篇 |
1994年 | 16篇 |
1993年 | 17篇 |
1992年 | 11篇 |
1991年 | 3篇 |
1990年 | 13篇 |
1989年 | 20篇 |
1988年 | 14篇 |
1987年 | 12篇 |
1986年 | 9篇 |
1985年 | 6篇 |
1981年 | 2篇 |
1979年 | 4篇 |
1967年 | 3篇 |
1966年 | 4篇 |
1964年 | 4篇 |
1963年 | 5篇 |
1961年 | 2篇 |
1957年 | 2篇 |
1956年 | 3篇 |
1955年 | 5篇 |
排序方式: 共有2804条查询结果,搜索用时 15 毫秒
11.
Hispanic children are the fastest growing segment of the population. Numerous factors place them at-risk for school success. This study examined the effects of Child-Centered Play Therapy (CCPT) compared to a curriculum-based small group intervention with 29 Hispanic children referred for school counseling due to behavior problems. Children were assigned to treatment groups by random drawing within grade levels. Treatment was provided by Hispanic bilingual counselors. Statistical analysis revealed that, according to parent report, children receiving CCPT showed statistically significant decreases in externalizing behavior problems, compared to the curriculum-based treatment group. Effect size calculations revealed that CCPT demonstrated a large treatment effect on externalizing behavior problems and a moderate treatment effect on internalizing behavior problems. Cultural considerations and recommendations for practice and future research are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
12.
This study aimed to better understand the impact of business trips on the traveler, the family, and the organization; to learn about maximizing the positive aspects of business travel; and to suggest measures to prevent and manage travel stress. Thirty-five business travelers (American, Israeli, and Swedish) were interviewed about the costs and benefits of their traveling, with a focus on gaining insight into coping strategies. Content analysis of the interviews showed that trips consist of 4 phases--(a) pretrip, (b) journey, (c) stay, and (d) posttrip--and that each phase is characterized by different coping strategies. Business travelers reported using proactive individual and organizational coping strategies in the pretrip phase and a combination of proactive and reactive coping strategies in the other phases. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
13.
This article presents the abandonment-symbiosis hypothesis. This hypothesis pertains to the dynamics of suicide in youngsters who experience difficulties in separation from their symbiotic families. It is suggested that such youngsters have experienced various types of rejection and abandonment in early childhood and have developed insecure attachment styles and insufficient ego functions in order to cope with difficulties. It is also suggested that these youngsters have become scapegoats by their dysfunctional families and that they are held in a symbiotic grip in order to continue to bear the negative projections of their families. As such, they are prevented from developing a proper sense of individuation and autonomy. The sequence that begins with abandonment and continues with symbiosis is a reversal of normal development is critical for the emergence of suicidal behavior. The various aspects of the abandonment-symbiosis hypothesis are demonstrated by case studies and empirical data. A combination of individual and family treatment is recommended as the best approach for the treatment of such youngsters. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
14.
Children's perceived attachments with parents, and family cohesion and adaptability were examined as predictors, mediators, and moderators in the parental problem drinking-child outcomes link. A total of 216 6- to 12-year-olds (110 boys, 106 girls) participated. Data were obtained from children and their mothers, fathers, and teachers. A higher level of family cohesion and adaptability functioned as (a) a robust protective factor against adjustment and cognitive difficulties otherwise associated with problem drinking and (b) a mediator of adjustment problems. Children's perceptions of attachments to mothers and fathers were consistent predictors of behavioral, social, and cognitive problems and further moderated relations between problem drinking and child functioning. The results support that child-parent and family functioning variables act as either pathways and/or vulnerability and protective factors for children exposed to a high-risk environment. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
15.
Ramirez Juan R.; Crano William D.; Quist Ryan; Burgoon Michael; Alvaro Eusebio M.; Grandpre Joseph 《Canadian Metallurgical Quarterly》2004,18(1):3
The authors investigated relationships between marijuana and inhalant use and several cultural and demographic factors in Anglo American and Hispanic American adolescents (N=1,094). Outcome measures assessed lifetime and 30-day marijuana and inhalant use. Predictors and covariates used in logistic regression analyses were region, grade, gender, knowledge, acculturation, familism, and parental monitoring. Hispanic Americans exhibited higher usage across all measures. In this group, high acculturation was associated with low marijuana, but high inhalant, use. Across all participants, positive family relations and parental monitoring were strongly associated with attenuated marijuana use hut only among those most knowledgeable about drugs. Familism and monitoring were not associated with diminished usage among the less knowledgeable. For inhalants, monitoring combined with high knowledge or high familism was associated with diminished usage. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
16.
Robbins Michael S.; Turner Charles W.; Alexander James F.; Perez Gonzalo A. 《Canadian Metallurgical Quarterly》2003,17(4):534
This study examined the relationship between alliance and retention in family therapy. Alliance was examined at the individual (parent and adolescent) and family levels (within-family differences). Participants were 34 families who received functional family therapy for the treatment of adolescent (aged 12-18 years) behavior problems. Families were classified as treatment dropouts (n=14) or completers (n=20). Videotapes of the first sessions were rated to identify parent and adolescent alliances with the therapist. Results demonstrated that individual parent and adolescent alliances did not predict retention. However, as hypothesized, dropout cases had significantly higher unbalanced alliances (parent minus adolescent) than did completer cases. These findings highlight the importance of alliances in functional family therapy and suggest that how the alliance operates in conjoint family therapy may be a function of systemic rather than of individual processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
17.
18.
Hanssen M.; Krabbendam L.; Vollema M.; Delespaul P.; Van Os J. 《Canadian Metallurgical Quarterly》2006,115(1):5
It is unknown to what degree dimensions of schizotypy (subclinical psychosis) show independent, family-specific variation in the general population. Psychologists administered the Community Assessment of Psychic Experiences, the Structured Interview for Schizotypy-Revised (SIS-R), and the Brief Psychiatric Rating Scale to 257 subjects pertaining to 82 general population families. All 3 instruments showed family-specific variation for positive and negative subclinical psychosis dimensions with between-families proportions of total variance between 10% and 40%. However, only the SIS-R showed family-specific variation of the negative dimension independent of its correlation with the positive dimension. The positive dimension of subclinical psychosis shows familial-specific variation in samples unselected for psychiatric disorder, suggesting dimensional liability in the population. The SIS-R additionally captures family-specific variation in the negative domain. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
19.
Snell-Johns Jessica; Mendez Julia L.; Smith Bradley H. 《Canadian Metallurgical Quarterly》2004,18(1):19
Various definitions exist for what constitutes family therapy. In this article, we consider family therapy to encompass any intervention that targets family interactions and conceptualizes problems as existing beyond individual clients. Numerous individual studies and several quantitative reviews have established family therapy as an effective treatment modality and the treatment of choice for many disorders. However, critiques of existing service provision highlight the unfortunate fact that numerous barriers to treatment exist at multiple levels of the broader ecology, preventing many families from benefiting from these services. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
20.
This article outlines an approach to treatment of sexually abused children with dissociative symptoms. Dissociated self-states are seen as competing interpersonal approaches to handling the many emotional sequela of abuse, including anger, fear, and regressive needs. Parents' responses to their sexually abused children, complicated by guilt and their own histories of trauma, can promote dissociative coping in the children as they have difficulty processing their own real feelings of anger, fear, and responsibility. Children and parents may alternatively take victimizer, victim, and rescuer roles, thus mutually reinforcing a dissociative style of coping with these events. This article illustrates how sensitivity to these family dynamics, along with a problem-solving approach to the child's symptoms, can treat dissociative psychopathology in these children. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献