全文获取类型
| 收费全文 | 309篇 |
| 免费 | 16篇 |
| 国内免费 | 8篇 |
专业分类
| 综合类 | 34篇 |
| 化学工业 | 24篇 |
| 金属工艺 | 65篇 |
| 机械仪表 | 12篇 |
| 建筑科学 | 6篇 |
| 矿业工程 | 4篇 |
| 能源动力 | 4篇 |
| 轻工业 | 101篇 |
| 石油天然气 | 4篇 |
| 武器工业 | 2篇 |
| 无线电 | 12篇 |
| 一般工业技术 | 42篇 |
| 冶金工业 | 8篇 |
| 自动化技术 | 15篇 |
出版年
| 2025年 | 6篇 |
| 2024年 | 7篇 |
| 2023年 | 7篇 |
| 2022年 | 7篇 |
| 2021年 | 19篇 |
| 2020年 | 25篇 |
| 2019年 | 12篇 |
| 2018年 | 7篇 |
| 2017年 | 24篇 |
| 2016年 | 8篇 |
| 2015年 | 13篇 |
| 2014年 | 11篇 |
| 2013年 | 19篇 |
| 2012年 | 17篇 |
| 2011年 | 13篇 |
| 2010年 | 18篇 |
| 2009年 | 11篇 |
| 2008年 | 16篇 |
| 2007年 | 12篇 |
| 2006年 | 13篇 |
| 2005年 | 10篇 |
| 2004年 | 8篇 |
| 2003年 | 10篇 |
| 2002年 | 10篇 |
| 2001年 | 4篇 |
| 2000年 | 7篇 |
| 1999年 | 4篇 |
| 1998年 | 5篇 |
| 1997年 | 2篇 |
| 1996年 | 1篇 |
| 1995年 | 1篇 |
| 1993年 | 1篇 |
| 1992年 | 3篇 |
| 1991年 | 1篇 |
| 1990年 | 1篇 |
排序方式： 共有333条查询结果，搜索用时 15 毫秒
51.
W. P. Wang T. H. Hwang E. Y. Shu M. H. Vartanian R. A. Ridilla 《Applied Composite Materials》1997,4(3):187-195
Wrinkles, porosity, delaminations and other defects introduced during the manufacturing processing can compromise mechanical
performance of advanced composites. This paper describes a method of using fiber optic sensors for monitoring the formation
of graphite fiber bending in real time during manufacturing process. Theoretical formulation of the sensor behavior and experimental
results are presented. The response of the sensor to composite fiber bending is characterized. The application to analyzing
the formation of wrinkles in compression molding of graphite/epoxy composites is demonstrated. 相似文献
52.
In this paper, the wrinkle resistance of plain fabrics woven with weft yarn in S‐ and Z‐twist directions and at various twist levels in different test directions has been measured and then analysed. Results show that the wrinkle resistance increases as the weft yarn twist increases. The wrinkle properties of the fabric show that the direction of test has an obvious effect on the results and the wrinkle resistance depends on the method of folding such as face‐to‐face and back‐to‐back methods. The experimental results showed that there is anisotropy in wrinkle properties of the fabric made of yarns with different twist directions. When the fabric is folded face‐to‐face and the weft twist direction is S, the wrinkle resistance of fabric in various test directions shows a convex curvature, whereas when the same fabric is folded in a back‐to‐back manner then results show a linear curvature. This means that the wrinkle resistance of a fabric differs in various directions and in the method of folding (back‐to‐back or face‐to‐face) and shows an anisotropic wrinkle resistance nature. 相似文献
53.
Manping Ma Zetian Jiang Tianjiao Ma Xiaxin Gao Jin Li Manhua Liu Junchi Yan Xuesong Jiang 《Advanced functional materials》2024,34(44):2405239
With the increasing demand for information security, current anti-counterfeiting methods not only suffer from issues such as low information density and vulnerability to forgery, but also inherently involve a trade-off between information capacity and readout methods. This paper reports a high-security solution using hierarchical pattern with perfect combination of micro self-wrinkle and nano phase-separation as physical unclonable function (PUF) labels, which is generated through self-organization of anthracene-functionalized poly(styrene-block-butadiene-block-styrene) (SBS-CAN) under UV exposure. The double-layer morphologies formed by the wrinkle and phase separation are adjustable, independent, and stable. The obtained hierarchical PUF labels exhibit random and unique features similar to the minutiae of fingerprints at both micro and nano scales, ensuring a well-balanced bit uniformity (>0.492), high uniqueness (>0.496), and outstanding reliability (>96%). As a consequence of the multi-layered combination of morphologies, the designed PUF label possesses an information density about 1010 times higher than that of human fingerprints. The PUF labels can be quickly obtained through simple visual scanning and exhibit sufficient security. To cope with various application environments, the advanced authentication pipeline designed LPLA guarantees robust label recognition capability in real-world scenarios. A practical integrated anti-counterfeiting authentication system is developed by combining hierarchical PUF labels and authentication pipeline. 相似文献
54.
Ziyu Chen Runhui Zhou Jiaoya Huang Huichen Xu Zemin Li Yushu Wang Rongrong Bao Jiang He Caofeng Pan 《Advanced functional materials》2024,34(44):2406434
The quest for stretchable properties is at the forefront of research dedicated to on-skin light–emitting devices. Inspired by the natural wonders of bioluminescence, electrochemiluminescent devices (ECLDs) are distinguished by straightforward design and reduced operating voltage, marking a departure from traditional current-driven electroluminescent devices (ACELDs). The primary challenge of fully-stretchable ECLDs lies in crafting electrodes that simultaneously satisfy the demands for conductivity, transparency, stretchability, oxidation resistance, and interface stability. This research introduces a groundbreaking wrinkled polymer-gold composite electrode. It extends to 50% stretchability, offers outstanding conductivity at 10 Ω sq−1, achieves transparency above 60%, and withstands over 10 000 stretching cycles. Employing this material, alongside stretchable electrospinning fiber luminescent layers, enabled the creation of fully-stretchable ECLDs. These devices not only shine brightly at 30 Cd m−2 but also retain more than 90% of luminosity when stretched up to 50%. Furthermore, this work has engineered stretchable devices featuring singular patterns and multi-dot arrays. They exhibit consistent luminescent output under bending, twisting, and stretching when applied to skin. These findings not only highlight the potential of polymer-gold composite electrodes in overcoming challenges faced by stretchable electronic devices but also provide new ideas for wearable technology that seamlessly integrates with human body. 相似文献
55.
56.
流体流动诱导微胶囊膜起皱和变形是一个普遍存在的现象。针对这一现象已有一些模拟和实验研究,但是对于微通道内不同因素对于微胶囊褶皱情况的影响以及褶皱的存在对于微胶囊实际膜面积和粒径的影响等方面却鲜有探讨。针对这一问题,本文制备了具有褶皱膜的聚酰胺微胶囊,并提出通过溶剂浸泡法将微胶囊膜褶皱伸展开,以分析微胶囊的实际膜面积和实际粒径。同时,定义了褶皱度的概念,将抽象的褶皱情况数值化,使分析更为方便。最终,通过研究分析发现,由于与流体剪切力正相关,流体流量和黏度的增大会导致微胶囊褶皱度增加;当这两者固定时,微胶囊粒径的改变对其褶皱度基本无影响。在应用方面,微胶囊壁面褶皱情况的分析为制备单核双壁式微胶囊提供了一种新思路。 相似文献
57.
为研究聚酯(PET)长丝/棉复合纱斜纹织物的保形性及服用性能,利用PET长丝与纯棉纱开发了3种线密度为9.8 tex的纱线,并以二上二下斜纹组织织造了4种织物。对织物进行了折皱回复性、免烫性、尺寸稳定性、悬垂性等保形性能,强伸性、拉伸弹性、顶破性等抗变形性测试,以及手感风格、透湿性、透气性等服用性能测试。对比分析了纯棉纱织物与复合纱织物的保形性与服用性能。结果表明:PET长丝/棉复合纱可改善纯棉织物的折皱回复性、悬垂性,提高免烫等级,同时又不影响织物的服用性能;包芯纱织物比包缠纱织物有更好的保形性,更高的免烫等级,是免烫衬衫面料的理想选择。 相似文献
58.
身管弹膛和线膛同锻技术可用径向精锻工艺同时锻出弹膛和线膛,将彻底解决身管弹膛和线膛的同轴度问题,改善坡膛部位的表面粗糙度。为提高身管内膛的加工质量,以身管弹膛和线膛同锻为对象,研究下沉段和锻造段产生的褶皱以及演变情况。通过对身管径向锻打试验和形貌试验分析处理,发现弹膛和线膛同锻时:下沉段将会产生褶皱,并且褶皱随着变形的增加,深度不断加深;当进入锻造段后,部分皱褶被打平,变成了身管微裂纹。应用有限元分析软件Abaqus对身管锻打过程进行仿真,发现锻打过程中下沉段径向应变εr和周向应变εθ的比值εr/εθ为定值,不同锻打工艺参数下应变比值不同。研究结果表明:身管下沉段单次锻打产生的褶皱深度Δdw可以用径向应变εr和周向应变εθ的比值εr/εθ来表示,拟合的关系式为Δdw=0. 058 8|εr/εθ|+0. 052 1;结合锻打所需的锤数可以预测出下沉段结束位置的皱褶深度,皱褶深度的预测有助于防止褶皱在锻造段挤压形成锻造身管的微裂纹。 相似文献
59.
锦纶/棉混纺织物存在易折皱外观不平整的问题,制约了其在高档服装上的应用。为此,以锦纶/棉混纺织物为研究对象,在坯布预处理后染整前对其进行液氨处理,研究了液氨处理对织物拉伸强力、撕破强力、折皱回复角及表面性能的影响。通过平滑感、温暖感及柔软感3个定量指标,评价液氨处理前后锦/棉混纺织物的风格、手感变化情况。结果表明:液氨整理可以提升锦/棉织物的拉伸强力及撕破强力,处理后织物的折皱回复角从218°提升至252.3°,粗糙度波长与振幅之比从50.46降低至44.87,表明液氨处理后织物的抗皱性和平滑感均得到了明显改善;尽管液氨处理未明显改善织物的柔软感,但处理织物的热导率较未处理织物仍有一定程度降低,致使织物接触温暖感有所提升。 相似文献
60.
为有效预测管材液压成形过程中存在的制品在外侧过度减薄和内侧起皱等问题,用JSTAMP/NV对汽车副车架成形的弯曲、预成形和管材液压成形工序分别进行有限元分析,得出各工序的成形极限云图和壁厚分布.应用逆向求解器HYSTAMP仅需直接指定管坯的尺寸参数、材料和弯曲工艺参数即可自动执行弯曲仿真并可在几秒内获取弯曲仿真的结果.设定液压成形工序的液压加载曲线和方向以及轴向进给位移,应用LS-DYNA执行预成形和液压成形工序仿真.JSTAMP/NV能有效模拟管材液压成形工艺过程,并预测和消除成形过程中在变形区出现的屈曲、起皱和破裂等缺陷. 相似文献