全文获取类型
收费全文 | 1722篇 |
免费 | 96篇 |
专业分类
电工技术 | 15篇 |
综合类 | 4篇 |
化学工业 | 477篇 |
金属工艺 | 43篇 |
机械仪表 | 44篇 |
建筑科学 | 83篇 |
矿业工程 | 2篇 |
能源动力 | 27篇 |
轻工业 | 184篇 |
水利工程 | 15篇 |
石油天然气 | 2篇 |
无线电 | 100篇 |
一般工业技术 | 268篇 |
冶金工业 | 365篇 |
原子能技术 | 4篇 |
自动化技术 | 185篇 |
出版年
2023年 | 20篇 |
2022年 | 50篇 |
2021年 | 93篇 |
2020年 | 47篇 |
2019年 | 45篇 |
2018年 | 39篇 |
2017年 | 46篇 |
2016年 | 41篇 |
2015年 | 54篇 |
2014年 | 40篇 |
2013年 | 86篇 |
2012年 | 89篇 |
2011年 | 111篇 |
2010年 | 80篇 |
2009年 | 74篇 |
2008年 | 99篇 |
2007年 | 92篇 |
2006年 | 69篇 |
2005年 | 50篇 |
2004年 | 62篇 |
2003年 | 50篇 |
2002年 | 42篇 |
2001年 | 33篇 |
2000年 | 25篇 |
1999年 | 19篇 |
1998年 | 46篇 |
1997年 | 40篇 |
1996年 | 30篇 |
1995年 | 18篇 |
1994年 | 12篇 |
1993年 | 15篇 |
1992年 | 5篇 |
1991年 | 7篇 |
1990年 | 8篇 |
1989年 | 11篇 |
1988年 | 15篇 |
1987年 | 15篇 |
1986年 | 8篇 |
1985年 | 17篇 |
1984年 | 5篇 |
1983年 | 13篇 |
1982年 | 11篇 |
1981年 | 9篇 |
1980年 | 12篇 |
1979年 | 8篇 |
1977年 | 7篇 |
1976年 | 10篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1970年 | 6篇 |
排序方式: 共有1818条查询结果,搜索用时 15 毫秒
71.
Tracey MacTavish Marie-Odile Marceau Michael Optis Kara Shaw Peter Stephenson Peter Wild 《Journal of Housing and the Built Environment》2012,27(2):207-224
First Nation (Indigenous) on-reserve housing in Canada is in crisis due to severe shortages, high reported instances of mould contamination, overcrowding and structural deficiencies. The Kitamaat reserve of the Haisla First Nation provides one example. The intent of the study reported here was to engage with the Haisla to develop a culturally appropriate, environmentally responsive and energy-efficient housing type that the Haisla could implement in the future. This work was undertaken by Marceau-Evans-Johnson Architects in collaboration with researchers at the University of Victoria. In this article, the circumstances leading to the present housing crisis are reviewed, the consultative design process with the Haisla and its outcomes are described, and the concept design solution which was co-developed for future housing is presented. 相似文献
72.
Alistair Wood Yuval Gurfinkel Nicole Polain Wesley Lamont Sarah Lyn Rea 《International journal of molecular sciences》2021,22(9)
Amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD) are neurodegenerative disorders that exist on a disease spectrum due to pathological, clinical and genetic overlap. In up to 97% of ALS cases and ~50% of FTLD cases, the primary pathological protein observed in affected tissues is TDP-43, which is hyperphosphorylated, ubiquitinated and cleaved. The TDP-43 is observed in aggregates that are abnormally located in the cytoplasm. The pathogenicity of TDP-43 cytoplasmic aggregates may be linked with both a loss of nuclear function and a gain of toxic functions. The cellular processes involved in ALS and FTLD disease pathogenesis include changes to RNA splicing, abnormal stress granules, mitochondrial dysfunction, impairments to axonal transport and autophagy, abnormal neuromuscular junctions, endoplasmic reticulum stress and the subsequent induction of the unfolded protein response. Here, we review and discuss the evidence for alterations to these processes that have been reported in cellular and animal models of TDP-43 proteinopathy. 相似文献
73.
A method using normal phase high performance liquid chromatography for the analysis of olefins and diolefins in cracked petroleum samples is proposed and validated in this work. A silver-impregnated silica column is used to separate olefin and diolefin species, resulting in accurate quantification of both group-types. Separations are completed using an isocratic hexane mobile phase, with no sample clean up or backflushing required. Results from the analysis of 11 model compounds are shown, as well as quantification data for four representative samples; figures of merit are also described. 相似文献
74.
75.
Dr. Johannes Broichhagen Dr. Nicole Kilian 《Chembiochem : a European journal of chemical biology》2021,22(13):2219-2236
Parasitic diseases like malaria tropica have been shaping human evolution and history since the beginning of mankind. After infection, the response of the human host ranges from asymptomatic to severe and may culminate in death. Therefore, proper examination of the parasite's biology is pivotal to deciphering unique molecular, biochemical and cell biological processes, which in turn ensure the identification of treatment strategies, such as potent drug targets and vaccine candidates. However, implementing molecular biology methods for genetic manipulation proves to be difficult for many parasite model organisms. The development of fast and straightforward applicable alternatives, for instance small-molecule probes from the field of chemical biology, is essential. In this review, we will recapitulate the highlights of previous molecular and chemical biology approaches that have already created insight and understanding of the malaria parasite Plasmodium falciparum. We discuss current developments from the field of chemical biology and explore how their application could advance research into this parasite in the future. We anticipate that the described approaches will help to close knowledge gaps in the biology of P. falciparum and we hope that researchers will be inspired to use these methods to gain knowledge – with the aim of ending this devastating disease. 相似文献
76.
Maurits Kaptein Deonne Castaneda Nicole Fernandez Clifford Nass 《Journal of Computer-Mediated Communication》2014,19(3):342-357
The feeling of connectedness experienced in computer‐mediated relationships can be explained by the similarity‐attraction effect (SAE). Though SAE is well established in psychology, the effects of some types of similarity have not yet been explored. In 2 studies, we demonstrate similarity‐attraction based on the timing of activities—“when‐similarity.” We describe a novel experimental paradigm for manifesting when‐similarity while controlling for the activities being performed (what‐similarity). Study 1 (N = 24) shows when‐similarity attraction in the evaluation of connectedness with others. Study 2 (N = 42) identifies an interaction between who‐similarity—similarity in personal backgrounds—and when‐similarity. Both studies show that real‐time computer‐mediated interaction can lead to greater feelings of connectedness between people when there is an opportunity to discover when‐similarity. 相似文献
77.
78.
Joao Henrique da Silva Rego ;Antonio Alberto Nepomucenol ;Enio Pazini Figueiredo ;Nicole Pagan Hasparyk 《土木工程与建筑:英文版》2014,(11):1396-1402
In several countries, the residual RHA (rice husk ash) has been produced in rice processing industries or in thermoelectric plants that use rice husk to generate heat and/or electrical energy, usually without burning process control. This causes a reduction in the amorphous silica content of residual RHA, which distinguishes them from the RHA produced according to controlled burning process, which is totally amorphous and considered a highly reactive pozzolan. In this paper, the hydration products and the porous structure of binders paste were studied by replacing, in weight of 5%, 10% and 20% of Portland cement OPC (ordinary Portland cement), by residual RHAs named A and B, which have high and low content of amorphous silica, respectively, using microstructure evaluation techniques as XRD (X-ray diffraction), TG (thermogravimetric) tests and MIP (mercury intrusion porosimetry). A reducing the size of the pores of the pastes was observed according to the increase of content replacement of RHA A and RHA B. 相似文献
79.
80.