全文获取类型
收费全文 | 1065篇 |
免费 | 64篇 |
国内免费 | 9篇 |
专业分类
电工技术 | 8篇 |
综合类 | 45篇 |
化学工业 | 223篇 |
金属工艺 | 10篇 |
机械仪表 | 58篇 |
建筑科学 | 43篇 |
矿业工程 | 1篇 |
能源动力 | 35篇 |
轻工业 | 339篇 |
水利工程 | 2篇 |
石油天然气 | 9篇 |
无线电 | 62篇 |
一般工业技术 | 179篇 |
冶金工业 | 20篇 |
原子能技术 | 36篇 |
自动化技术 | 68篇 |
出版年
2024年 | 5篇 |
2023年 | 17篇 |
2022年 | 38篇 |
2021年 | 42篇 |
2020年 | 21篇 |
2019年 | 13篇 |
2018年 | 30篇 |
2017年 | 33篇 |
2016年 | 37篇 |
2015年 | 37篇 |
2014年 | 69篇 |
2013年 | 81篇 |
2012年 | 61篇 |
2011年 | 69篇 |
2010年 | 63篇 |
2009年 | 66篇 |
2008年 | 61篇 |
2007年 | 48篇 |
2006年 | 59篇 |
2005年 | 50篇 |
2004年 | 32篇 |
2003年 | 39篇 |
2002年 | 33篇 |
2001年 | 13篇 |
2000年 | 15篇 |
1999年 | 14篇 |
1998年 | 11篇 |
1997年 | 6篇 |
1996年 | 8篇 |
1995年 | 7篇 |
1994年 | 5篇 |
1993年 | 7篇 |
1992年 | 3篇 |
1991年 | 11篇 |
1990年 | 7篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有1138条查询结果,搜索用时 15 毫秒
11.
用大容积(60mm×80mm)的圆柱型流气式组织等效正比计数器测定了239Puα粒子的微剂量谱和径向剂量分布。α粒子束在无窗的情况下直接穿入正比计数器,由离子穿过而发生能量沉积的机率Rb为1。测量结果证实:沿α粒子径迹由单次事件沉积的剂量平均比能z1D(Gy)与距径迹核径向距离b(μm)之间完全符合z1D=ab-2的函数关系,同时给出了求出最大径向距离(penumbra)的方法。 相似文献
12.
Barbora Peltanova Marketa Liskova Jaromir Gumulec Martina Raudenska Hana Holcova Polanska Tomas Vaculovic David Kalfert Marek Grega Jan Plzak Jan Betka Michal Masarik 《International journal of molecular sciences》2021,22(4)
Cancer-associated fibroblasts (CAFs) are one of the most abundant and critical components of the tumor stroma. CAFs can impact many important steps of cancerogenesis and may also influence treatment resistance. Some of these effects need the direct contact of CAFs and cancer cells, while some involve paracrine signals. In this study, we investigated the ability of head and neck squamous cell carcinomas (HNSCC) patient-derived CAFs to promote or inhibit the colony-forming ability of HNSCC cells. The effect of cisplatin on this promoting or inhibiting influence was also studied. The subsequent analysis focused on changes in the expression of genes associated with cancer progression. We found that cisplatin response in model HNSCC cancer cells was modified by coculture with CAFs, was CAF-specific, and different patient-derived CAFs had a different “sensitizing ratio”. Increased expression of VEGFA, PGE2S, COX2, EGFR, and NANOG in cancer cells was characteristic for the increase of resistance. On the other hand, CCL2 expression was associated with sensitizing effect. Significantly higher amounts of cisplatin were found in CAFs derived from patients who subsequently experienced a recurrence. In conclusion, our results showed that CAFs could promote and/or inhibit colony-forming capability and cisplatin resistance in HNSCC cells via paracrine effects and subsequent changes in gene expression of cancer-associated genes in cancer cells. 相似文献
13.
14.
15.
16.
17.
邓殷 《重庆电力高等专科学校学报》2014,19(5):30-32
分析民族音乐面临的困境与发展现状,揭示我国民族音乐的独特内涵及深远的意义,从民族音乐的收集与整理、教材的编写与推广、课程与师资队伍建设、教学模式的创新,音乐教育资源的整合、民族音乐文化活动的开展与弘扬等方面,提出推进民族音乐在高校音乐教育中的融入与发展的对策。 相似文献
18.
Xiao-Juan Luo Triantafyllos Stylianopoulos Victor H. Barocas Mark S. Shephard 《Engineering with Computers》2009,25(1):87-95
The mechanical function of soft collagenous tissues is inherently multiscale, with the tissue dimension being in the centimeter
length scale and the underlying collagen network being in the micrometer length scale. This paper uses a volume averaging
multiscale model to predict the collagen gel mechanics. The model is simulated using a multiscale component toolkit that is
capable of dealing with any 3D geometries. Each scale in the multiscale model is treated as an independent component that
exchanges the deformation and average stress information through a scale-linking operator. An arterial bifurcation was simulated
using the multiscale model, and the results demonstrated that the mechanical response of the soft tissues is strongly sensitive
to the network orientation and fiber-to-fiber interactions. 相似文献
19.
Braunschweig T Kaserer K Chung JY Bilke S Krizman D Knezevic V Hewitt SM 《Proteomics. Clinical applications》2007,1(3):264-271
Thyroid cancer is the most common endocrine neoplasm with multiple histologic subtypes, each associated with different treatments and outcomes. Differentiating benign neoplasms such as follicular adenomas from malignant entities such as follicular carcinomas and papillary carcinoma can be challenging. To define the proteomic profile of different thyroid tumors, we screened an antibody array of 330 features against five thyroid neoplasms: follicular adenoma, follicular carcinoma, papillary carcinoma, anaplastic carcinoma, and medullary carcinoma as well as normal thyroid epithelium. Eight candidate biomarkers; c-erbB-2, Stat5a, Annexin IV, IL-11, RARα, FGF7, Caspase 9, and phospho-c-myc were identified as differentially expressed on the antibody array, and validated with immunohistochemistry on tissue microarrays, with a total of 144 samples of the same variety of thyroid neoplasms. Analysis revealed c-erbB-2, Annexin IV, and Stat5a have potential clinical utility to differentiate follicular adenoma, follicular carcinoma, and papillary carcinoma from each other. By using an antibody array as a discovery platform and a tissue microarray as a first step in validation on a large number of specimens, we have identified new markers that have potential utility in the diagnosis of thyroid neoplasms. 相似文献
20.
Humorously describes fictional studies "proving" that motor and language development occur concurrently ("hand in hand") and that this development is independent of culture. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献