全文获取类型
收费全文 | 12882篇 |
免费 | 38篇 |
专业分类
电工技术 | 35篇 |
化学工业 | 374篇 |
金属工艺 | 33篇 |
机械仪表 | 24篇 |
建筑科学 | 126篇 |
矿业工程 | 1篇 |
能源动力 | 49篇 |
轻工业 | 188篇 |
水利工程 | 35篇 |
石油天然气 | 5篇 |
无线电 | 243篇 |
一般工业技术 | 372篇 |
冶金工业 | 11186篇 |
原子能技术 | 12篇 |
自动化技术 | 237篇 |
出版年
2021年 | 15篇 |
2020年 | 11篇 |
2018年 | 14篇 |
2017年 | 23篇 |
2016年 | 21篇 |
2015年 | 17篇 |
2014年 | 23篇 |
2013年 | 77篇 |
2012年 | 53篇 |
2011年 | 70篇 |
2010年 | 46篇 |
2009年 | 64篇 |
2008年 | 84篇 |
2007年 | 79篇 |
2006年 | 64篇 |
2005年 | 69篇 |
2004年 | 44篇 |
2003年 | 72篇 |
2002年 | 63篇 |
2001年 | 50篇 |
2000年 | 48篇 |
1999年 | 345篇 |
1998年 | 3579篇 |
1997年 | 2068篇 |
1996年 | 1298篇 |
1995年 | 745篇 |
1994年 | 609篇 |
1993年 | 723篇 |
1992年 | 121篇 |
1991年 | 173篇 |
1990年 | 161篇 |
1989年 | 175篇 |
1988年 | 172篇 |
1987年 | 139篇 |
1986年 | 123篇 |
1985年 | 108篇 |
1984年 | 37篇 |
1983年 | 32篇 |
1982年 | 75篇 |
1981年 | 91篇 |
1980年 | 97篇 |
1979年 | 49篇 |
1978年 | 40篇 |
1977年 | 235篇 |
1976年 | 522篇 |
1975年 | 32篇 |
1974年 | 22篇 |
1973年 | 29篇 |
1971年 | 13篇 |
1967年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
41.
J Lamoril C Andant C Bogard H Puy L Gouya JM Pawlotsky V Da Silva JC Soulé JC Deybach Y Nordmann 《Canadian Metallurgical Quarterly》1998,27(3):848-852
From 1995 to 1997, we prospectively evaluated the prevalence of hepatitis C virus (HCV) RNA in 124 patients with porphyria cutanea tarda (PCT) from Northern France (83 sporadic and 41 familial PCT). Serum samples were analyzed for ferritin, transaminases, HCV antibodies, and HCV RNA. In addition, genotyping of HCV and searches for HCV infection risk factors (blood transfusion, iv drug abuse, and surgical intervention) were performed. Twenty-six of 124 patients (21%; 95% CI: 13.9-28) were positive for serum HCV antibodies. All of them were also positive for HCV RNA. The prevalence of HCV infection was higher in the sporadic PCT group (26.5%, 22 out of 83) than in the familial PCT group (9.7%, 4 out of 41). Risk factors for hepatitis C infection were found to be significantly increased in the HCV-positive group when compared with the HCV-negative PCT group. In all HCV-positive patients with a risk factor, the suspected date of exposure to the virus always preceded the clinical onset of PCT. The HCV genotype pattern in PCT patients was similar to that observed in nonporphyric HCV patients in western European countries. Serum ferritin level was increased in both HCV-positive and HCV-negative porphyric patients. Transaminase levels were significantly higher in HCV-infected PCT patients. Sixty-seven out of 124 patients were retrospectively studied for hepatitis G virus (HGV) infection. Six of these 67 patients (8.9%; 95% CI: 2.1-15.8) were positive for HGV RNA. None of the six HGV-infected patients were positive for HCV RNA. The HGV-infected patients did not differ statistically from those without HGV infection with regard to age, ferritin, transaminase levels, and PCT treatment. These results support the view that sporadic cases of HGV infection may occur frequently. This study of a large cohort of HCV and PCT patients further documents an increasing gradient in HCV prevalence from northern to southern Europe, and shows that HCV infection acts as a triggering factor of PCT. Finally, the HGV prevalence found in the PCT patients was comparable with that found in French blood donors, suggesting that HGV is not a PCT triggering factor. 相似文献
42.
JE Myers T Mieczkowski J Perel D Abbondanza TB Cooper JJ Mann 《Canadian Metallurgical Quarterly》1994,35(2):112-120
Serotonergic responsivity was assessed in 20 psychiatric patients by the prolactin response to a fenfluramine challenge test. During the fenfluramine challenge 6 of 20 patients (30%) spontaneously reported psychopathologic reactions that included: increased anxiety/agitation, psychotic symptoms, illusions, mood elevation, and anergia. The time of peak behavioral symptoms (2.5 +/- 0.8 hrs) corresponded closely to the time of peak increase in prolactin levels (3.0 +/- 1.1 hr). Abnormal behavioral responders had statistically significant greater increases in prolactin 1 to 4 hr after fenfluramine when compared to normal responders. Patients who developed an abnormal psychopathologic response to fenfluramine were characterized by higher levels of anxiety and agitation at the time of admission to the hospital but otherwise were not distinguishable on the basis of severity of other psychiatric symptoms. This study suggests that increased serotonergic transmission may trigger anxiety, psychosis, and mood elevation in specific vulnerable individuals, whereas other patients with similar psychiatric illnesses are not affected. 相似文献
43.
44.
A Simple Constraint-Based Algorithm for Efficiently Mining Observational Databases for Causal Relationships 总被引:4,自引:0,他引:4
Gregory F. Cooper 《Data mining and knowledge discovery》1997,1(2):203-224
This paper presents a simple, efficient computer-based method for discovering causal relationships from databases that contain observational data. Observational data is passively observed, as contrasted with experimental data. Most of the databases available for data mining are observational. There is great potential for mining such databases to discover causal relationships. We illustrate how observational data can constrain the causal relationships among measured variables, sometimes to the point that we can conclude that one variable is causing another variable. The presentation here is based on a constraint-based approach to causal discovery. A primary purpose of this paper is to present the constraint-based causal discovery method in the simplest possible fashion in order to (1) readily convey the basic ideas that underlie more complex constraint-based causal discovery techniques, and (2) permit interested readers to rapidly program and apply the method to their own databases, as a start toward using more elaborate causal discovery algorithms. 相似文献
45.
VP Korhonen M Tolvanen JM Hyttinen M Uusi-Oukari R Sinervirta L Alhonen M Jauhiainen OA J?nne J J?nne 《Canadian Metallurgical Quarterly》1997,245(2):482-489
We have generated several transgenic mouse lines and rabbits expressing efficiently (up to 0.3 mg/ml in mice and up to 0.5 mg/ml in rabbits) human erythropoietin in their milk as bovine beta-lactoglobulin fusion protein. Human erythropoietin cDNA was inserted in frame into exon 5 of the bovine beta-lactoglobulin gene with a linker oligonucleotide encoding the cleavage site for bacterial IgA protease. RNA analysis performed on one lactating transgenic mouse and one transgenic rabbit revealed that the fusion gene was expressed almost exlusively in the mammary gland, although low amounts of transgene-derived RNA were detectable in salivary glands and uterus or in the kidney. The fusion protein was specifically cleaved with IgA protease. The erythropoietin part obtained upon digestion had a lower molecular mass than recombinant erythropoietin produced in Chinese hamster ovary cells. By deglycosylation analysis it was shown that the difference in size was due to a different type of glycosylation. Biological activity of the fusion protein, as determined by growth stimulation of TF-1 erythroleukemia cells, was less than 15% of that of human recombinant erythropoietin. Upon digestion of the fusion protein with IgA protease, biological activity comparable to that of the recombinant erythropoietin was recovered. Transgenic males and virgin females did not show signs of enhanced erythropoiesis, but lactating females expressing the transgene displayed transient increases in their hematocrit values. 相似文献
46.
AV Stefano LF Canosa JL D'Eramo O Fridman JM Affanni GM Somoza 《Canadian Metallurgical Quarterly》1997,118(3):335-345
Gonadotropin-releasing hormone (GnRH) molecular variants in the brain and pituitary gland of pejerrey, Odontesthes bonariensis (Atheriniformes), were characterized by gradient reverse phase high performance liquid chromatography (RP-HPLC). Eluted fractions were tested in radioimmunoassays with different antisera. The results show that the brain extract contains three forms of GnRH: one is immunologically and chromatographically similar to cIIGnRH (chicken II), and another is similar to sGnRH (salmon). A third GnRH appears to be chromatographic and immunologically different from the nine other known forms of the vertebrate hormone. This is the only variant present in the pituitary gland. 相似文献
47.
48.
49.
The research study described here was commissioned by the English National Board to examine nursing in the context of Project 2000 implementation. The research team explored the impact of Project 2000 on students, managers and practitioners. Students and diplomates were perceived to be patient-oriented and holistic in approach; basic nursing care was identified as a central role of qualified nurses. Perceptions of nursing shifted as the course progressed to include health promotion, and research and theory as a basis for practice. Aspects of the course valued by students included the broader academic input, interpersonal skills, life sciences, supernumerary status and the challenging approach advocated by the course. Students were concerned about the timing of the biological science modules, which often did not coincide with their practice experiences. Students identified poor course organisation and poor teaching skills of some lecturers as areas for concern. Managers and practitioners identified students as potential agents of change who challenged traditional expectations of newly qualified nurses. 相似文献
50.
LA Pérula de Torres J Martínez de la Iglesia J Espejo Espejo MV Rubio Cuadrado I Enciso Berge FJ Fonseca del Pozo JM Aranda Lara 《Canadian Metallurgical Quarterly》1997,20(8):425-434
OBJECTIVE: To describe the health status of a population over 60 years and to study their relationship with several socio-demographic variables. DESIGN: A cross-sectional study, population based. SETTINGS: A community. PARTICIPANTS: A randomized sample of 1,103 non institutionalized people over 60 years living in the city of Cordoba (Spain). MEASUREMENTS AND MAIN RESULTS: By mean of a personal interview at home we used the OARS-MFAQ-VE questionnaire. Low self-rated health was associated with the age, to be female sex, a low cultural background, and a low income. Only 5.2% of the study people do not suffered any illness and 56% state that their health problems are major problems for doing their current activities. 4.9% declared to have some degree of physical incapacity. 3.7% of elderly population has an important cognitive deficit. CONCLUSIONS: The majority of elderly people has good health. Age is related with a poor health. Women have more health problems than men. 相似文献