全文获取类型
收费全文 | 8450篇 |
免费 | 494篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 117篇 |
综合类 | 23篇 |
化学工业 | 2197篇 |
金属工艺 | 245篇 |
机械仪表 | 148篇 |
建筑科学 | 591篇 |
矿业工程 | 98篇 |
能源动力 | 282篇 |
轻工业 | 604篇 |
水利工程 | 50篇 |
石油天然气 | 20篇 |
武器工业 | 1篇 |
无线电 | 669篇 |
一般工业技术 | 1750篇 |
冶金工业 | 496篇 |
原子能技术 | 49篇 |
自动化技术 | 1612篇 |
出版年
2024年 | 16篇 |
2023年 | 119篇 |
2022年 | 210篇 |
2021年 | 332篇 |
2020年 | 200篇 |
2019年 | 212篇 |
2018年 | 231篇 |
2017年 | 267篇 |
2016年 | 356篇 |
2015年 | 293篇 |
2014年 | 378篇 |
2013年 | 600篇 |
2012年 | 535篇 |
2011年 | 719篇 |
2010年 | 508篇 |
2009年 | 476篇 |
2008年 | 486篇 |
2007年 | 426篇 |
2006年 | 383篇 |
2005年 | 305篇 |
2004年 | 253篇 |
2003年 | 189篇 |
2002年 | 172篇 |
2001年 | 107篇 |
2000年 | 98篇 |
1999年 | 119篇 |
1998年 | 133篇 |
1997年 | 96篇 |
1996年 | 95篇 |
1995年 | 56篇 |
1994年 | 64篇 |
1993年 | 39篇 |
1992年 | 48篇 |
1991年 | 28篇 |
1990年 | 40篇 |
1989年 | 25篇 |
1988年 | 28篇 |
1987年 | 27篇 |
1986年 | 23篇 |
1985年 | 22篇 |
1984年 | 29篇 |
1983年 | 17篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 20篇 |
1978年 | 13篇 |
1977年 | 16篇 |
1976年 | 26篇 |
1975年 | 13篇 |
1969年 | 11篇 |
排序方式: 共有8952条查询结果,搜索用时 15 毫秒
101.
Spreafico Christian Russo Davide Degl’Innocenti Riccardo 《Journal of Intelligent Manufacturing》2022,33(2):353-385
Journal of Intelligent Manufacturing - This paper presents a critical review of laser pyrolysis. Although this technology is almost 60 years old, in literature many researchers, both from... 相似文献
102.
Long‐term effects of angiotensin II blockade with irbesartan on inflammatory markers in hemodialysis patients: A randomized double blind placebo controlled trial (SAFIR study) 下载免费PDF全文
Christian D. Peters Krista D. Kjaergaard Claus H. Nielsen Kent L. Christensen Bo M. Bibby Jens D. Jensen Bente Jespersen 《Hemodialysis international. International Symposium on Home Hemodialysis》2017,21(1):47-62
Introduction: Low‐grade chronic inflammation is common in hemodialysis (HD) patients. Previous studies suggest an anti‐inflammatory effect of angiotensin II receptor blocker (ARB) treatment. The aim of this study was to compare the effect of ARB vs. placebo on plasma concentrations of inflammatory markers in HD patients. Methods: Adult HD patients were randomized for double‐blind treatment with the ARB irbesartan 150–300 mg/day or placebo. At baseline, 1 week, 3, 6, 9, and 12 months plasma high sensitivity C‐reactive protein (hsCRP), interleukin (IL)?1β, IL‐6, IL‐8, IL‐18, and transforming growth factor‐β (TGF‐β) were measured using Luminex and enzyme‐linked immunosorbent assay (ELISA) technology. Findings: Eighty‐two patients were randomized (placebo/ARB: 41/41). The groups did not differ in initial levels of any of the inflammatory markers (placebo/ARB median(range)): hsCRP 3.3(0.2–23.4)/2.7(0.2–29.6) μg/mL; IL‐1β 1.1(0.0–45.9)/1.1(0.0‐7.2) pg/mL; IL‐6 10(1–90)/12(1–84) pg/mL; IL‐8 31(9–134)/34(5–192) pg/mL; IL‐18 364(188–1343)/377(213–832) pg/mL; TGF‐β 3.2(0.8–13.9)/3.6(1.3–3.8) ng/mL. Overall, there was no significant difference in hsCRP, IL‐6, IL‐8, and TGF‐β between placebo and ARB‐treated patients during the study period, and hsCRP, IL‐6, IL‐8, and TGF‐β were relatively stable during the study period (P ≥ 0.18 in all tests for parallel curves, equal levels, and constant levels). The IL‐1β level was slightly different in the two groups over time, but not significantly (P = 0.09 in test for parallel curves) and it was also relatively stable during the study period (P ≥ 0.49 in tests for equal levels and constant level). IL‐18 was the only inflammatory marker which was not constant during the study period (P = 0.001 in test for constant level), but there was no significant difference between placebo and ARB‐treated (P ≥ 0.51 in tests for parallel curves and equal levels). Discussion: Inflammatory biomarkers were neither acutely, nor in the long‐term significantly affected by the ARB irbesartan. Our findings suggest that ARB treatment in HD patients does not offer protective anti‐inflammatory effects. 相似文献
103.
Optimized Photoinitiator for Fast Two‐Photon Absorption Polymerization of Polyester‐Macromers for Tissue Engineering 下载免费PDF全文
104.
Structure and Magnetic Property Control of Copper Hydroxide Acetate by Non‐Classical Crystallization 下载免费PDF全文
RuiQi Song Theodora Krasia‐Christoforou Christian Debus Helmut Cölfen 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(9)
Copper hydroxide acetate (CHA), one layered hydroxide compound with tunable magnetism, attracts great interest because of its potential applications in memory devices. However, ferromagnetism for CHA is only demonstrated by means of GPa pressure. Herein, a new method is reported, involving the combination of different crystallization pathways to control crystallization of amorphous CHA toward the formation of CHA/polymer composites with tunable magnetic properties and even a tunability that can be tested at room temperature. By using poly[(ethylene glycol)6 methyl ether methacrylate]‐block‐poly[2‐(acetoacetoxy) ethyl methacrylate] (PEGMA‐b‐PAEMA) diblock copolymers as additives in combination with a post‐treatment process by ultracentrifugation, it is demonstrated that CHA and PEGMA‐b‐PAEMA form composites exhibiting different magnetic properties, depending on CHA in‐plane nanostructures. Analytical characterization reveals that crystallization of CHA is induced by ultracentrifugation, during which CHA nanostructures can be well controlled by changing the degrees of polymerization of the PEGMA and PAEMA blocks and their block length ratios. These findings not only present the first example of using crystallization from polymer stabilized amorphous precursors toward the generation of magnetic nanomaterials with tunable magnetism but also pave the way for the future design of functional composite materials. 相似文献
105.
Mariano J. Savelski C. Stewart Slater Paul V. Tozzi Christian M. Wisniewski 《Clean Technologies and Environmental Policy》2017,19(10):2467-2477
This study explores design alternatives for the purification and possible reuse of low-volume organic solvents waste streams in pharmaceutical manufacturing. Solvent use has a large impact on the life cycle of pharmaceutical processes, as typically 80–90% of the total mass used in the production of an active pharmaceutical ingredient is attributed to solvent use. Solvents are not consumed in pharmaceutical processes so they exit the process as waste. These waste streams are usually disposed of using incineration; therefore, generating significant life cycle emissions from disposal and replacement of virgin solvent. Solvent recovery efforts are generally limited to large-volume waste streams. However, results show that solvents in low-volume streams can also be economically recovered using a versatile multi-campaign solvent recovery skid. Three different solvent waste streams were evaluated, and 85.3% reduction in total emissions and 86.3% reduction in operating costs were achieved. Investment in the solvent recovery system was determined to have a payback period of 4.5 years and a 28% IRR over 10 years. A life cycle impact assessment shows impacts on the human health, ecosystems, and resources categories have been reduced by 82.4, 85.1, and 87.1%, respectively. 相似文献
106.
Bioimaging: Shaping Luminescent Properties of Yb3+ and Ho3+ Co‐Doped Upconverting Core–Shell β‐NaYF4 Nanoparticles by Dopant Distribution and Spacing (Small 47/2017) 下载免费PDF全文
107.
Real‐time updating of structural mechanics models using Kalman filtering,modified constitutive relation error,and proper generalized decomposition 下载免费PDF全文
Basile Marchand Ludovic Chamoin Christian Rey 《International journal for numerical methods in engineering》2016,107(9):786-810
The paper aims at proposing a new strategy for real‐time identification or updating of structural mechanics models defined as dynamical systems. The main idea is to introduce the modified constitutive relation error concept, which is a practical tool that enables to efficiently solve identification problems with highly corrupted data, into the Kalman filtering, which is a classical framework for data assimilation. Furthermore, a PGD‐based model reduction method is performed in order to optimize capabilities of the online updating strategy. Performances of the proposed approach, in terms of robustness gain and computational cost reduction, are illustrated on several unsteady thermal applications. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
108.
109.
Unraveling Unprecedented Charge Carrier Mobility through Structure Property Relationship of Four Isomers of Didodecyl[1]benzothieno[3,2‐b][1]benzothiophene 下载免费PDF全文
Yusuke Tsutsui Guillaume Schweicher Basab Chattopadhyay Tsuneaki Sakurai Jean‐Baptiste Arlin Christian Ruzié Almaz Aliev Artur Ciesielski Alan R. Kennedy Vincent Lemaur Yoann Olivier Rachid Hadji Lionel Sanguinet Frédéric Castet Silvio Osella Dmytro Dudenko David Beljonne Jérôme Cornil Paolo Samorì Shu Seki Yves H. Geerts 《Advanced materials (Deerfield Beach, Fla.)》2016,28(33):7106-7114
110.
Single‐Molecule Magnets: Giant Hysteresis of Single‐Molecule Magnets Adsorbed on a Nonmagnetic Insulator (Adv. Mater. 26/2016) 下载免费PDF全文