全文获取类型
| 收费全文 | 657篇 |
| 免费 | 39篇 |
| 国内免费 | 19篇 |
专业分类
| 电工技术 | 2篇 |
| 综合类 | 47篇 |
| 化学工业 | 204篇 |
| 金属工艺 | 12篇 |
| 机械仪表 | 10篇 |
| 建筑科学 | 112篇 |
| 矿业工程 | 20篇 |
| 能源动力 | 10篇 |
| 轻工业 | 81篇 |
| 水利工程 | 27篇 |
| 石油天然气 | 20篇 |
| 无线电 | 31篇 |
| 一般工业技术 | 112篇 |
| 冶金工业 | 10篇 |
| 原子能技术 | 2篇 |
| 自动化技术 | 15篇 |
出版年
| 2025年 | 6篇 |
| 2024年 | 23篇 |
| 2023年 | 26篇 |
| 2022年 | 32篇 |
| 2021年 | 33篇 |
| 2020年 | 32篇 |
| 2019年 | 38篇 |
| 2018年 | 24篇 |
| 2017年 | 23篇 |
| 2016年 | 27篇 |
| 2015年 | 30篇 |
| 2014年 | 33篇 |
| 2013年 | 42篇 |
| 2012年 | 41篇 |
| 2011年 | 28篇 |
| 2010年 | 21篇 |
| 2009年 | 36篇 |
| 2008年 | 27篇 |
| 2007年 | 32篇 |
| 2006年 | 30篇 |
| 2005年 | 22篇 |
| 2004年 | 11篇 |
| 2003年 | 16篇 |
| 2002年 | 14篇 |
| 2001年 | 6篇 |
| 2000年 | 16篇 |
| 1999年 | 8篇 |
| 1998年 | 8篇 |
| 1997年 | 4篇 |
| 1996年 | 2篇 |
| 1995年 | 4篇 |
| 1994年 | 4篇 |
| 1993年 | 3篇 |
| 1992年 | 8篇 |
| 1990年 | 2篇 |
| 1987年 | 1篇 |
| 1985年 | 1篇 |
| 1951年 | 1篇 |
排序方式： 共有715条查询结果，搜索用时 15 毫秒
51.
In this investigation, rolling bottle tests and boiling water tests were conducted to evaluate the effect of different fillers and treatments on the adhesion between recycled concrete aggregates (RCA) and asphalt. The test results when 100% RCA loose mixtures were evaluated indicated that the filler that achieves the best asphalt aggregate bond was grey Portland cement. Curing the mixture in an oven for 4 h at mix temperature before compacting and coating RCA with bitumen emulsion are treatments that achieved satisfactory adhesion results as well. 相似文献
52.
Mehdi Shishehbor M. Reza Pouranian Reza Imaninasab 《Petroleum Science and Technology》2013,31(24):2084-2090
53.
《Food Control》2015
Classification of heat load applied to milk requires the detection of parameters appropriately related to the intensity of the heat treatment. Current analytical methods based on heat-induced changes in the protein component of milk have been directed either to determine the amount of protein-derived products arised from heat treatments or to evaluate the extent of thermal denaturation of milk proteins. Lately, a new analytical strategy has been developed according to the occurrence of three major whey proteins, namely bovine serum albumin (BSA), beta-lactoglobulin (βlg) and alfa-lactalbumin (αla), normally soluble at pH 4.6 in raw milk, in the pH 4.6 insoluble protein fraction recovered from heat-treated milk. The results have shown that pH 4.6 insoluble BSA, βlg and αla, as detected by ELISA in milk, can be regarded as thermal markers suited for either dairy process control or regulation purposes. 相似文献
54.
绿色再生混凝土是混凝土发展的必然方向。本文通过对不同强度等级绿色再生混凝土工作性和抗压强度进行了试验研究,结果表明,采用再生骨料配制高强再生混凝土是可行的。 相似文献
55.
Alexander Schnell;Katrin Rübner;Julia Seher;Constanze Müller;Anette Müller;Steffen Liebezeit;Jacob Fenner;Falk Martin;Nicole Pniok; 《化学，工程师，技术》2024,96(7):969-975
The objective of the REALight project is the development of a thermal process to produce lightweight aggregates in pilot scale and the implantation of a method to recover gypsum. Beside construction and demolition waste, various industrial by-products are studied as raw materials. The raw materials have so far been unused or used in applications with lower quality requirements. To prove the performance of the lightweight aggregates, their technical properties are tested and their use in different applications is studied, e.g., for lightweight mortars as well as lightweight concretes. 相似文献
56.
Alice Sirico Patrizia Bernardi Corrado Sciancalepore Beatrice Belletti Daniel Milanese Alessio Malcevschi 《Structural Concrete》2023,24(5):6721-6737
Only in Europe, every year around 29 million tons of plastic waste are generated and only about 35% of such waste is collected for recycling. This results in huge amounts of plastic waste threatening the environment. One of the possible solutions for disposal can be represented by the concrete industry. Several research works have already studied the use of plastic waste in concrete mix as partial replacement for aggregates, showing that this use of plastics can contribute to reducing the environmental impact of concrete production by saving non-renewable resources. At the same time, lightweight concrete can be produced but at a non-negligible cost of a mechanical strength reduction. This work aims at investigating the effects on concrete physical and mechanical performances resulting from the introduction of recycled plastic aggregates in combination with another kind of waste used as filler, namely biochar. Biochar, which is the solid carbonaceous by-product resulting from wood-waste pyro-gasification, can have the role of carbon sequestrating additive in concrete, being able to fix carbon in a stable form in buildings for decades. The experimental findings obtained in this work show that the combination of biochar and recycled plastic waste, which was never investigated before, can help to obtain concretes with satisfactory mechanical performance, which promote circular economy principles. Thanks to biochar addition, the reduction in mechanical properties due to the presence of plastics is extremely limited with respect to control; moreover, these concretes demonstrate better behavior in terms of fracture energy and ductility. 相似文献
57.
Yanan Guo Bailiang Li Tianfu Cheng Zhaodong Hu Shuangqi Liu Jun Liu Fuwei Sun Zengwang Guo Zhongjiang Wang 《International Journal of Food Science & Technology》2023,58(1):343-354
The objective of this study was to investigate the effects of cavitation jets on the structural, emulsifying and rheological properties of soybean protein oxidation aggregates. The results showed that oxidation might induce the formation of larger particle sizes and molecular weight protein aggregates and the decrease of emulsifying properties. The cavitation jet at a short treatment time (<6 min) broke down the disulphide bonds and protein skeleton structures, which reduced the aggregate sizes and molecular weights and increased the emulsion activities, emulsion stabilities, apparent viscosity and elastic modulus. The cavitation jet at a long treatment time (>6 min) supported disulphide bond formation among molecules by intermolecular interactions to form protein aggregates. In addition, the skeleton structure showed cross-linking aggregation. This increased the particle sizes and molecular weights and reduced the emulsion properties, consistency index K and elastic modulus. The findings showed that a cavitation jet at 6 min on oxidised aggregates of soybean protein might enhance the structural, emulsifying and rheological characteristics for the industry. 相似文献
58.
Jie Xue Jingyi Xu Qingxin Liang Yu Dai Rui Wang Yuanping Yi Juan Qiao 《Advanced functional materials》2023,33(30):2301312
Though urgently needed, high-efficiency near-infrared (NIR) organic light-emitting diode (OLED) is still rare due to the energy-gap law. Formation of intermolecular charge-transfer aggregates (CTA) with nonadiabatic coupling suppression can decelerate non-radiative decay rates for high-efficiency NIR-OLEDs. However, the aggregation effect of CTA is still not fully understood, which limits the rational design of CTA. Herein, two CTA molecules with a same π-framework but different terminal substituents are developed to unveil the aggregation effect. In highly ordered crystalline states, the terminal substituents substantially affect the molecular packing motifs and intermolecular charge-transfer states, thus leading to distinct photophysical properties. In comparison, in amorphous states, these two CTA demonstrate similar photophysical behaviors and properties due to their similar molecular packing and intermolecular interactions as evidenced by molecular dynamics simulations. Importantly, the formations of amorphous CTA trigger multifunction improvements such as aggregation-induced NIR emission, aggregation-induced thermally activated delayed fluorescence, self-doping and self-host features. The non-doped OLEDs demonstrate NIR emissions centered at 788 and 803 nm, and high maximum external quantum efficiencies of 2.6% and 1.5% with small efficiency roll-off, respectively. This study provides deeper insight into the aggregation effect of CTA and lays a foundation for the development of high-efficiency NIR non-doped OLEDs. 相似文献
59.
Prof. Dr.-Ing. Anette Müller Steffen Liebezeit Dr.-Ing. Ulrich Palzer 《化学，工程师，技术》2023,95(10):1640-1646
The possibility of using heterogeneous construction waste such as masonry rubble as a raw material for the production of lightweight aggregates similar to expanded clays or even pumice has already been reported earlier. This approach has been consistently pursued. As a current aspect, the extent to which gypsum-containing masonry rubble is also suitable as a raw material was investigated. This not only avoids (expensive) landfilling of this material, but at the same time makes a contribution to at least partially filling the “gypsum gap” created by the elimination of flue gas desulfurization gypsum. The first part of this publication reports on laboratory-scale tests. The second part focuses on testing the process in the pilot plant. 相似文献
60.
Prof. Dr.-Ing. habil. Anette Müller Steffen Liebezeit Dr.-Ing. Ulrich Palzer 《化学，工程师，技术》2023,95(10):1647-1653
Heterogeneous construction waste such as masonry rubble has potential as a raw material for the production of lightweight aggregates similar to expanded clays or even pumice. In the present paper, the suitability of feedstocks with considerable gypsum contents was investigated in a pilot plant. Based on the results, initial technological statements could be made. According to these, energetic advantages can be expected in comparison with lightweight aggregates made from expanded clays. 相似文献