首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   77篇
  免费   5篇
  国内免费   6篇
电工技术   1篇
综合类   9篇
化学工业   30篇
金属工艺   7篇
机械仪表   2篇
能源动力   4篇
轻工业   4篇
石油天然气   2篇
无线电   7篇
一般工业技术   19篇
冶金工业   2篇
原子能技术   1篇
  2023年   2篇
  2021年   2篇
  2020年   5篇
  2019年   2篇
  2018年   3篇
  2016年   1篇
  2015年   1篇
  2014年   5篇
  2013年   5篇
  2012年   10篇
  2011年   9篇
  2010年   4篇
  2008年   3篇
  2007年   7篇
  2006年   8篇
  2005年   4篇
  2004年   4篇
  2003年   1篇
  2002年   1篇
  2001年   4篇
  2000年   2篇
  1999年   3篇
  1994年   1篇
  1993年   1篇
排序方式: 共有88条查询结果,搜索用时 15 毫秒
1.
为研究可穿戴织物的电加热性能以及水洗对其性能的影响,通过简单安全可大规模产业化的无转移液相浸涂沉积法在涤纶针织物上沉积并原位还原,制备了还原氧化石墨烯(RGO)涂层织物加热器。借助扫描电子显微镜和傅里叶红外光谱仪对制备的RGO涂层涤纶织物进行表观形态与化学结构分析,同时研究了RGO涂层涤纶织物的导电、力学、电加热性能。结果表明:RGO涂层涤纶织物的电导率为430.9 mS/cm,在10 V电压下可达到65.58 ℃的稳定温度,最大升温速率为3.41 ℃/s;经过2次水洗循环后,在10 V的电压下,RGO涂层涤纶织物可达到43 ℃。本文研究表明,RGO涂层涤纶织物具有优异的电热性能,在医用电热、运动康复等领域具有良好的应用潜力。  相似文献   
2.
采用两步法在FTO导电玻璃衬底上制备ZnO纳米棒,首先利用浸渍-提拉法在FTO导电玻璃衬底上制备ZnO晶种层,然后把有ZnO晶种层的FTO衬底放入盛有生长溶液的反应釜中利用水热法制备ZnO纳米棒.研究了生长溶液的浓度、生长温度和生长时间对所制备的对ZnO纳米棒阵列的微结构和光致发光性能的影响,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和光致发光谱(PL)研究了ZnO样品的结构、形貌和光学性质.实验结果表明:所制备的ZnO纳米棒呈现六方纤锌矿结构,沿(002)晶面择优取向生长,纳米棒的平均直径约为100 nm,长度约为2.5 μm.所制备的ZnO纳米棒在390 nm附近具有很强的紫外发光峰和在550 nm附近有较弱的宽绿光发光峰.  相似文献   
3.
Recently, ceramic matrix composites reinforced by short carbon fibers (CFs) attracted increasing attentions. To further improve mechanical properties and oxidation resistances, CFs were subjected to oxidation and acidification followed by sol-gel dip-coating to deposit ZrO2 on their surfaces. ZrO2-Cf/SiC composites were fabricated by joint hot compression molding and sintering, compared to Cf/SiC and SiC prepared by the same method. Microstructural analyses indicated that ZrO2 coatings were successfully deposited on CF surfaces, formed strong bonding and interfaces between CF and the matrix. Meanwhile, CFs were found uniformly distributed in SiC matrix with random orientations. Flexural curves of ZrO2-Cf/SiC and Cf/SiC revealed the presence of “false plasticity” regions after sharp drops, which were quite different from brittle flexural behavior of SiC ceramic. Compression strength of the three samples showed step-up growth. ZrO2-Cf/SiC exhibited the highest value, indicating the introduction of CFs and ZrO2 coatings do have great influence on mechanical performances. After heat treatment, ZrO2-Cf/SiC exhibited better oxidation resistance than Cf/SiC, with weight loss ratios estimated to ??3.76% and ??6.43%, respectively. These improved properties indicated that ZrO2-Cf/SiC would be excellent alternatives to other existence materials under ultra-high temperature environments.  相似文献   
4.
履带由于其外形复杂,对漆膜要求较低,目前普遍采用浸涂工艺,由于工艺简单,涂装往往不被重视,容易引发一些外观质量问题。从浸漆设备、涂料种类、工艺参数、前处理4个方面探讨了影响浸涂质量的因素。  相似文献   
5.
A typical oxygen permeation hollow fiber membrane fabricated by phase inversion-based extrusion process demonstrates heterogeneous porous microstructures, in which the surface layer with relatively low porosity is used as a separation layer after sintering. It is usually not convenient to control the thickness of separation layer. And a high sintering temperature is needed to densify the separation layer, which in turn could destroy the desired porous microstructures in other portion. This paper studies a novel process to fabricate multilayer asymmetric hollow fiber membrane with a rational design using 67 vol. % Gd0.2Ce0.8O2−δ−33 vol. % La0.6Sr0.4Co0.2Fe0.8O3−δ (GDC-LSCF) as a model material system. The phase inversion-based extrusion process in open literature is employed to fabricate a hollow fiber substrate featuring radially well-aligned microchannels open at the inner surface. Built upon the hollow fiber substrate, a thin dense separation layer and porous surface catalyst layer at shell side are then fabricated through dip-coating and sintering process alternatively. The oxygen permeation flux of the fabricated hollow fiber membrane reaches 2.68 mL/cm2/min at 900°C under Ar/air gradient, the highest performance of the membranes with GDC-LSCF material system in open literature. The innovative fabrication process is able to readily control the thickness of functional layers while decreasing sintering temperatures.  相似文献   
6.
采用浸涂法,以载玻片为基底,十六烷基三甲基溴化铵(CTAB)为模板剂,正硅酸乙酯(TEOS)为硅源,丙三醇为成膜干燥控制剂,制备出有序的介孔SiO2薄膜.利用X射线衍射仪(XRD)、红外光谱(IR)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对其结构进行表征.XRD测试结果表明,合成的薄膜具有MCM-41介孔结...  相似文献   
7.
浸渍层厚度对蜂窝吸波性能的影响   总被引:1,自引:0,他引:1  
研究了浸渍层厚度对双层蜂窝材料吸波性能的影响。结果表明:蜂窝材料的吸波性能不仅与浸渍层的电磁参数有关,还与其厚度有关。随浸渍层厚度的增加,蜂窝材料的吸波性能逐渐增加;厚度达到一定程度后,高频吸波性能增加,而低频吸波性能则降低。  相似文献   
8.
Melamine and melamine resins are widely used as fire retardants for polymer materials used in pharmaceutical, plastic, textile, rubber, and construction industry. Melamine-based flame retardants act by blowing off intumescent layers, char formation, and emission of quenching ammonia gas and diluent molecular nitrogen. Special advantages are: low cost, low smoke density and toxicity, low corrosive activity, safe handling, and environmental friendliness. Methylated poly(melamine-co-formaldehyde) (mPMF) was used as thick (≥40?μm) fire-retardant coating for plasma pretreated polymers. A combined low-pressure plasma pretreatment consisting of oxygen plasma exposure followed by deposition of thin poly(allylamine) (ppAAm) and poly(allyl alcohol) (ppAAl) plasma polymers as adhesion promoters have improved the adhesion of thick mPMF coatings strongly. Chemical structure and composition of deposited polymer films were characterized by infrared-attenuated total reflectance and X-ray photoelectron spectroscopy (XPS). After peeling, the peeled layer surfaces were also investigated for identification of the locus of failure and their topography using optical microscopy and XPS. Often the adhesion promotion was so efficient that the peeling of coating was not possible. Thermal properties of plasma polymers and dip-coating films were analyzed by thermogravimetric analysis. Significant improvement of fire-retardant properties of coated polymers was confirmed by flame tests.  相似文献   
9.
采用水热法成功制备了Cu2ZnSnS4(CZTS)半导体材料,通过浸涂法制备了相应的薄膜,并在N2气氛中于400℃对薄膜进行了退火处理.用X射线荧光光谱分析了所得CZTS粉末中各组成元素的含量,并分别用X射线衍射、扫描电子显微镜和紫外-可见-近红外光谱对CZTS薄膜样品的晶体结构、表面形貌和带隙进行了表征.结果表明:所...  相似文献   
10.
采用溶胶凝胶-浸渍提拉法,制备了玻璃基底上生长的Fe/TiO2薄膜.利用XRD、XPS、AFM等对样品进行表征,研究了铁掺杂对TiO2薄膜晶体结构和表面形貌的影响,并研究了不同掺铁量TiO2薄膜对大肠杆菌的抗菌性能.结果表明,铁掺杂TiO2薄膜的抗菌性能均优于纯TiO2薄膜,其中掺铁量为0.1%时薄膜的抗菌性能最佳,高达98%.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号