全文获取类型
收费全文 | 31篇 |
免费 | 2篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 8篇 |
机械仪表 | 2篇 |
能源动力 | 1篇 |
轻工业 | 8篇 |
一般工业技术 | 8篇 |
原子能技术 | 3篇 |
自动化技术 | 2篇 |
出版年
2020年 | 1篇 |
2013年 | 6篇 |
2012年 | 1篇 |
2010年 | 2篇 |
2006年 | 1篇 |
2004年 | 1篇 |
2002年 | 3篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1993年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1971年 | 1篇 |
1967年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有33条查询结果,搜索用时 15 毫秒
1.
1 放射性废物管理方面( 1 )应当建立一个国家级的废放射源管理战略。此战略应包括过去、现在和将来产生的所有放射性废物。此废物管理战略可以由国家指定的委员会来制订。该委员会可以包括来自主要废物的产生单位、废物管理机构和相应的审管部门的代表。此战略应当涵盖技术选择 (处理和处置 )和基础架构 (废物管理机构和基金 )。( 2 )放射性废物管理 ,包括废密封源管理。要求有专门的技术设施和特别训练的人员。为避免基础结构和人力资源重复设置 ,可以考虑单一的废物管理机构。该机构可设有区域性的分支机构 ,也可以设有专门的部门管理来… 相似文献
2.
RALF G. BERGER FRIEDRICH DRAWERT HUBERT KOLLMANNSBERGER SIEGFRIED NITZ 《Journal of food science》1985,50(6):1655-1656
1-(E,Z)-3,5-undecatriene and 1-(E,Z,Z)-3,5,8-undecatetraene were isolated under enzyme inhibition from edible parts of peach, passion fruit, and kiwi; the triene only was found in celery, parsley, mandarine, apple and pear. Capillary gas chromatography, sniffing-capillary gas chromatography, and combined “live”-capillary gas chromatography-mass spectrometry of the concentrated liquid-liquid extracts were used to establish their identity. Owing to their ultra-low odor detection thresholds and the proposed biogenesis, these trace compounds may be “character impacts” in a wide variety of food flavors of plant origin. 相似文献
3.
ALEXANDRA NAVROTSKY BARRY A. WECHSLER KAREN GEISINGER FRIEDRICH SEIFERT 《Journal of the American Ceramic Society》1986,69(5):418-422
Solution calorimetry of MgAl2 O4 -Al8/3 O4 solid solutions was performed in a molten 2PbO · B2 O3 solvent at 975 K. The results indicate small negative heats of mixing, relative to spinel standard states for both end-members. These data were combined with information on the energetics of the α-γ transition in Al2 O3 and on the MgAl2 O4 -Al8/3 O4 (MgO-Al2 O3 ) subsolidus phase relations to estimate the partial molar entropy of mixing of γ-Al8/3 O4 in the solid solution. This entropy is much less positive than that calculated from several models for the configurational entropy of mixing of magnesium, aluminum, and vacancies on octahedral and/or tetrahedral sites. The data suggest a good deal of local order to be present in the solid solutions, consistent with negative enthalpies of mixing and entropies of mixing far less than ideal configurational values. 相似文献
4.
GUENTHER HIMSOLT HEINRICH KNOCH HEINZ HUEBNER † FRIEDRICH WILHELM KLEINLEIN 《Journal of the American Ceramic Society》1979,62(1-2):29-32
During hot-pressing of α-Si3 N4 powders, the equiaxed α micro-structure gradually transforms into a β structure characterized by needle-shaped prismatic grains which are closely entangled and linked together. With increasing amounts of the β fraction, the bend strength, fracture toughness, and work of fracture increase significantly, then decrease as grain growth occurs. The K lc , improves by a factor of >2 and the change in γF by a factor of >4. The crack resistance to achieve the same crack velocity in materials of different β contents shows a similar trend. The dependence of the mechanical properties on the microstructure is explained by linking and pullout of the β crystals and by grain coarsening. 相似文献
5.
NMR Study of Adsorbate Self-Diffusion in Porous Glasses 总被引:1,自引:0,他引:1
JÖRG KÁRGER JÖRG LENZNER HARRY PFEIFER HARTMUT SCHWABE WOLFGANG HEYER FRANK JANOWSKI FRIEDRICH WOLF SERGEJ PETROVI DANOV 《Journal of the American Ceramic Society》1983,66(1):69-72
The NMR pulsed field gradient technique was used to study molecular transport in porous glasses. The adsorbent materials were produced by leaching phase-separated sodium-boron-silica glasses of different composition, then heat-treating. The pore diameters of the glass samples produced were within the interval 0.8 to 50 nm. Water, methanol, dodecane, and do-decene were used as adsorbates. The coefficients of adsorbate self-diffusion were found to decrease with decreasing pore diameter. In comparison with the neat liquids, a reduction in the adsorbate mobility (up to two orders of magnitude) was observed. For the larger pores, that decrease may be attributed to the tortuosity of the adsorbent, whereas the low diffusivities in the porous glasses with small pores are a consequence of the stabilizing effect of the rigid adsorbent framework. 相似文献
6.
以提高环氧树脂的摩擦磨损性能为目的,研究了纳米碳化硅粒子填充环氧树脂复合材料的滑动干摩擦磨损特性,着重探讨纳米粒子表面接枝改性、纳米粒子含量、摩擦条件等对复合材料摩擦学性能的影响。通过对复合材料磨损表面的形貌分析,以及复合材料的热变形性能和表面硬度的测定,探讨了复合材料的磨损机理。结果表明,纳米碳化硅粒子能在很低的含量下提高环氧树脂耐磨性、并降低其摩擦系数,而经过接枝处理后的纳米碳化硅粒子填充复合材料的上述性能改善更为明显,耐磨性比环氧树脂提高近4倍,摩擦系数降低36%。这说明在SiC纳米粒子表面引入聚丙烯酰胺接枝链后,由于界面的强相互作用 ( 包括化学键合与链纠缠),有效地提高了复合材料的抵抗裂纹引发能力等性能,从而有利于改善其摩擦学性能。 相似文献
7.
K. E. SEIFERT 《Journal of the American Ceramic Society》1967,50(12):660-661
Single crystals of plagiodase feldspar were selectively etched by immersion in aqueous solutions of Na2 CO3 and K2 CO3 for 48 hr and in 48% HF for 1 to 3 sec. The etched surfaces are replicated using a two-stage Formvar-carbon replica shadowed with palladium. These replicas reveal that etching varies in different twin lamellas and that etch pits align along twin boundaries. 相似文献
8.
Proteolytic activity among psychrotrophic bacteria isolated from refrigerated raw milk 总被引:1,自引:0,他引:1
MARIA F B L NÖRNBERG ROSANE S C FRIEDRICH RITA D N WEISS EDUARDO C TONDO ADRIANO BRANDELLI 《International Journal of Dairy Technology》2010,63(1):41-46
Psychrotrophic bacteria were isolated from refrigerated raw milk from a processing plant in Southern Brazil. Psychrotrophic counts were between 4.9 and 7.8 log cfu/mL, and 5.3 to 7.2 log cfu/mL, for samples collected at the truck and the milk storage silo, respectively. Among the bacterial isolates, 90% were Gram-negative. Most strains presented low proteolytic activity, but strains of Burkholderia cepacia, Klebsiella oxytoca and Aeromonas sp. showed higher than 20 U/mL on azocasein as substrate. Crude proteases from selected strains were resistant to conventional heat treatments and caused coagulation of UHT milk after 5 days storage at room temperature. 相似文献
9.
A justification model for setup time reduction is presented. The model includes inventory carrying cost, setup cost, storage cost, setup time reduction cost, and quality cost. The level of setup time reduction which yields the lowest total cost indicates the extent to which setup time reduction is economically justified. A case study is presented based on one machine and one product. Results indicate that unlimited setup time reduction is not always justified based on the analysis of one product. However, a greater level of reduction is justified if the lot size is reduced appropriately as setup time is reduced. 相似文献
10.