全文获取类型
收费全文 | 84篇 |
免费 | 5篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 4篇 |
化学工业 | 28篇 |
金属工艺 | 5篇 |
机械仪表 | 4篇 |
建筑科学 | 1篇 |
能源动力 | 3篇 |
轻工业 | 28篇 |
水利工程 | 1篇 |
一般工业技术 | 10篇 |
原子能技术 | 2篇 |
自动化技术 | 9篇 |
出版年
2021年 | 2篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 1篇 |
2014年 | 1篇 |
2013年 | 13篇 |
2010年 | 2篇 |
2008年 | 1篇 |
2007年 | 2篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 5篇 |
1995年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1971年 | 2篇 |
1970年 | 2篇 |
1969年 | 1篇 |
1967年 | 2篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1960年 | 1篇 |
1959年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有95条查询结果,搜索用时 31 毫秒
41.
SHIN-ICHI HIRANO TAKAYUKI YAMAGUCHI SHIGEHARU NAKA 《Journal of the American Ceramic Society》1981,64(12):734-736
Aluminum nitride was found to act as the catalyst for the synthesis of cubic BN by sealing the mixture of hexagonal BN and AIN in a pressure cell under the inert or reducing atmosphere. No conversion of hexagonal BN to cubic BN was observed under pressures below 7×109 Pa (7 GPa, 70 kbar) without AIN addition. All hexagonal BN could be completely converted to cubic BN under 6.5 GPa at 1600°C by the addition of 20 mol% AIN. The cubic BN thus synthesized was a typical tetrahedron (grain size ≅2 μm). The pressure-temperature diagram for the synthesis of cubic BN was determined at >7 GPa and T <1700°C. 相似文献
42.
43.
44.
A New PV Converter for Grid Connection Through a High‐Leg Delta Transformer Using Cooperative Control of Boost Converters and Inverters
下载免费PDF全文
![点击此处可从《Electrical Engineering in Japan》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This paper proposes a new high‐efficiency photovoltaic (PV) converter for grid connection through a high‐leg delta transformer, which is composed of a symmetrically connected boost converter and three half‐bridge inverters. One of the three half‐bridge inverters is connected to the boost converter, and the others are directly connected to the PV terminals. This circuit configuration enables to reduce the power losses in both boost converter and inverter. This paper also proposes a new cooperative control method between the symmetrically connected boost converter and inverter. The control method can reduce the average switching frequency to 75% of that in a conventional one, resulting in a great reduction in switching power loss. Experimental results show that the proposed circuit improves its European efficiency from 91.6% to 94.5%. 相似文献
45.
SHIRO TAMAKI HIDEYUKI YAMAGUCHI TETSUHIKO YAMAMOTO HIROSHI KINJO EIHO UEZATO NAOKI OSHIRO 《International journal of systems science》2013,44(10):1593-1605
Thermoluminescence dating has attracted the attention of geology and archaeology researchers as a new method. This method requires a heating device to raise the temperature of the specimens at an exact rate. This paper describes the design method of a control system that can achieve this goal. This control system lends to be unstable because of the existence of the parameter perturbation and dead time. In this paper, the perturbation and dead time are treated as perturbations of a nominal plant regarded as a first-order lag time system. Improvement of tracking characteristics in the low-frequency domain and robust stability in the high-frequency domain of the control system are achieved by using the solution of the mixed-sensitivity problem that is a kind of H∞ control theory. Experiments verify the effectiveness of this method. 相似文献
46.
47.
48.
TSUTOMU MITA 《International journal of control》2013,86(6):841-851
A practical design procedure of an unknown input observer for a class of multi-input/output systems is presented, the fixed poles of this observer are shown to be given by the zeros of the McMillan form. 相似文献
49.
层片状双相TiAl合金拉伸与压缩变形行为差异 总被引:3,自引:0,他引:3
本文研究了层片状双相TiAl合金的室温拉伸压缩变形行为与断裂行为,发现在拉压变形条件下,其室温塑性有显著差异.并且这种差异与裂纹扩展路径有关.在室温拉伸与压缩变形时,该合金的拉压屈服应力随外载与层片界面间的夹角φ的变化趋势一致,而拉压断裂应变εf随夹角φ的变化趋势正好相反.外载与层片界面垂直时(φ=90°),拉伸断裂应变最小(εf≈0);压缩断裂应变最大(εf≈38%).夹角φ减小时,拉伸断裂应变增加,压缩断裂应变减小.在拉、压变形时裂纹的扩展路径不同. 相似文献
50.
Akira YAMAGUCHI 《中国耐火材料》2007,16(3):3-7
One of characteristics of Cr2O3-containing refractory is excellent corrosion resistance. However, there is a problem of hexavalent chromium, which is noxious to the human body, and easily formed by the reactions among the refractory and CaO, Na2O and/or K2O in slag. In this article, the reason why the Cr2O3-containing refractory has excellent corrosion resistance, the forming conditions of hexavalent compounds, and the methods for suppressing generation of the compound, are described as a base of further development of excellent refractories. 相似文献