全文获取类型
收费全文 | 101篇 |
免费 | 2篇 |
专业分类
化学工业 | 8篇 |
金属工艺 | 1篇 |
机械仪表 | 12篇 |
建筑科学 | 1篇 |
能源动力 | 2篇 |
轻工业 | 61篇 |
一般工业技术 | 9篇 |
自动化技术 | 9篇 |
出版年
2022年 | 2篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2013年 | 19篇 |
2012年 | 11篇 |
2011年 | 8篇 |
2010年 | 10篇 |
2009年 | 7篇 |
2008年 | 3篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2005年 | 4篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 6篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1997年 | 3篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1987年 | 1篇 |
1984年 | 2篇 |
1979年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有103条查询结果,搜索用时 742 毫秒
1.
LAERTE DAGHER CASSOLI PAULO FERNANDO MACHADO ANA CAROLINA DE OLIVEIRA RODRIGUES ARLEI COLDEBELLA 《International Journal of Dairy Technology》2007,60(1):44-48
Milk samples were collected in the dry season ( n = 155) and in the rainy season ( n = 68) to establish a correlation between electronic flow cytometry and standard plate count for the determination of total bacterial count of raw milk. Results were expressed in individual bacterial count (ibc) and colony forming unit (cfu) for electronic flow cytometry (Bactocount) and standard plate count, respectively. The accuracy of Bactocount, denoted by the residual standard deviation ( s ( y,x )), was 0.309 log cfu/mL. The predictive interval of estimated values was broad and it is suggested that total bacterial count should be expressed in ibc without transformation to cfu. 相似文献
2.
J. T. TIAN J. M. MOLINA J. NARCISO C. GARCÍA-CORDOVILLA E. LOUIS 《Journal of Materials Science》2005,40(9-10):2537-2540
Oxidizing SiC particles is a common practice in the fabrication of SiC/Al composites through direct mixing of the liquid metal and the ceramic particles. This practice is addressed to reduce the reaction between the two materials. In a previous work it was concluded that oxidizing SiC particles scarcely affected the threshold pressure for infiltration of pure Al into compacts made of those particles. In this work we present a detailed study of this problem for infiltration of pure Al and the eutectic Al-Si alloy. Our results indicate that oxidizing of SiC particles does not affect significantly either the threshold pressure or the infiltration kinetics. This conclusion is equally valid for both pure Al and the eutectic alloy. 相似文献
3.
M E SáNCHEZ-VERGARA V GARCíA-MONTALVO J SANTOYO-SALAZAR R J FRAGOSO-SORIANO O JIMéNEZ-SANDOVAL 《Bulletin of Materials Science》2012,35(5):759-766
NiPcTSTNa(L) [L = ethylenediamine (EDA); 1,4-diaminobutane (BDA); and 2,6-diamineanthraquinone (AqDA)] thin films were deposited by thermal evaporation. Their surface morphology was studied by AFM and SEM, and their chemical composition determined by EDS. Optical absorption studies of NiPcTSTNa(L) films were performed in the 200?C1150?nm wavelength range. The optical bandgap of thin films was determined from the (??h ??)1/2 vs h?? plots for indirect allowed transitions. The temperature dependence of electrical conductivity shows a semiconducting behaviour. The amorphous semiconductor films show thermal activation energies of electrical conduction between 3·3 and 3·7?eV. 相似文献
4.
A procedure to find the existence and domain of asymptotic stability for a class of systems described by a set of non-linear partial differential equations is presented in the context of semigroup theory. No a priori bound is imposed on the non-linearity which is assumed to be a quad ratic (bilinear) or multilinear form. The linearized system can be non-self-adjoint and need not be asymptotically stable equation by equation. The solution of the stability problem is carried out. in two steps : (a) the development of an L2-like norm that bounds above the sup norm, a requirement to obtain a useful estimate of the non-linear term, and (a)the computation of an estimate of the L2-likc norm of the semigroup generated by the linearized system in terms of its usual L2 norm. 相似文献
5.
Inline electron holography and VEELS for the measurement of strain in ternary and quaternary (In,Al,Ga)N alloyed thin films and its effect on bandgap energy
下载免费PDF全文
![点击此处可从《Journal of microscopy》网站下载免费的PDF全文](/ch/ext_images/free.gif)
J.M. MÁNUEL C.T. KOCH V.B. ÖZDÖL W. SIGLE P.A. VAN AKEN R. GARCÍA F.M. MORALES 《Journal of microscopy》2016,261(1):27-35
We present the use of (1) dark‐field inline electron holography for measuring the structural strain, and indirectly obtaining the composition, in a wurtzite, 4‐nm‐thick InAlGaN epilayer on a AlN/GaN/AlN/GaN multinano‐layer heterosystem, and (2) valence electron energy‐loss spectroscopy to study the bandgap value of five different, also hexagonal, 20–50‐nm‐thick InAlGaN layers. The measured strain values were almost identical to the ones obtained by other techniques for similarly grown materials. We found that the biaxial strain in the III‐N alloys lowers the bandgap energy as compared to the value calculated with different known expressions and bowing parameters for unstrained layers. By contrast, calculated and experimental values agreed in the case of lattice‐matched (almost unstrained) heterostructures. 相似文献
6.
7.
JORGE A. PINO DÉBORAH CASTRO PEDRO FITO JOSÉ BARAT FERNANDO LÓPEZ 《Journal of food quality》1999,22(6):653-661
Principal component analysis and cluster analysis of volatile compounds were used for selecting technological parameters in the osmotic dehydration of pineapple. Assessment of volatile losses permitted differentiation between samples obtained by different osmotic treatments. Treatments at 30C for 1 h at atmospheric pressure or under vacuum and at 30C or 40C for 1 to 3 h with pulsed vacuum (1 cycle) produce the lowest losses of volatile compounds. Apparently, pulsed vacuum allows higher aromatic volatiles retention than two other pressure modes. It also allows increases in both process temperature and time without an important increase in losses. 相似文献
8.
S. GARCÍA L.G. SANTESTEBAN C. MIRANDA J.B. ROYO 《Australian Journal of Grape and Wine Research》2011,17(2):162-168
Background and Aims: In viticultural and oenological research, grape samples are frequently stored frozen to overcome time and facility restraint. However, there is little knowledge on how freezing, variety and storage time affect the changes occurring in grape quality parameters. The aim of the paper was to evaluate these effects using cv. Cabernet Sauvignon (CS), Grenache (GA) and Tempranillo (TE) samples. Methods and Results: Quality parameters were assessed in fresh grapes and after 1, 3 and 6 months of frozen storage. Soluble solid concentration remained unchanged. Freezing decreased titratable and tartaric acidity. pH increased after 1 and 3 months of storage, but decreased after 6 months. Freezing increased malic acid concentration only in GA. Yeast assimilable nitrogen diminished with freezing time, with each variety behaving differently. A significant colour enhancement was found (EAnt, L*, C*), whereas degradative reactions for polyphenols occurred at any storage time for GA, and for all varieties after 6 months. Conclusions: Variety and storage time play a large role in the changes occurring in stored frozen grape samples. Not considering these factors may lead to misinterpretation of results obtained through subsequent use of these grapes. Significance of the Study: Specific correcting factors for each quality parameter, variety and storage time are needed when working with stored frozen samples. 相似文献
9.
10.