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921.
Studies with isolated rat adrenocortical cells have shown that neuropeptide Y (NPY) inhibits both basal and ACTH-stimulated corticosterone secretion. These results suggest the regulatory role of NPY in corticosterone secretion from the adrenal gland, especially during stress. 相似文献
922.
O. B. Sheynin 《Archive for History of Exact Sciences》1989,39(4):337-377
Communicated by
H. Freudenthal 相似文献
923.
Oxide to metal conversion is one of the most energy-intensive steps in the value chain for metals production. Solid oxide membrane (SOM) electrolysis process provides a general route for directly reducing various metal oxides to their respective metals, alloys, or intermetallics. Because of its lower energy use and ability to use inert anode resulting in zero carbon emission, SOM electrolysis process emerges as a promising technology that can replace the state-of-the-art metals production processes. In this paper, a careful study of the SOM electrolysis process using equivalent DC circuit modeling is performed and correlated to the experimental results. A discussion on relative importance of each resistive element in the circuit and on possible ways of lowering the rate-limiting resistive elements provides a generic guideline for designing optimum SOM electrolysis cells. 相似文献
924.
Owing to its high carrier mobility and saturation velocity, graphene has attracted enormous attention in recent years. In particular, high-performance graphene transistors for radio-frequency (r.f.) applications are of great interest. Synthesis of large-scale graphene sheets of high quality and at low cost has been demonstrated using chemical vapour deposition (CVD) methods. However, very few studies have been performed on the scaling behaviour of transistors made from CVD graphene for r.f. applications, which hold great potential for commercialization. Here we report the systematic study of top-gated CVD-graphene r.f. transistors with gate lengths scaled down to 40 nm, the shortest gate length demonstrated on graphene r.f. devices. The CVD graphene was grown on copper film and transferred to a wafer of diamond-like carbon. Cut-off frequencies as high as 155 GHz have been obtained for the 40-nm transistors, and the cut-off frequency was found to scale as 1/(gate length). Furthermore, we studied graphene r.f. transistors at cryogenic temperatures. Unlike conventional semiconductor devices where low-temperature performance is hampered by carrier freeze-out effects, the r.f. performance of our graphene devices exhibits little temperature dependence down to 4.3 K, providing a much larger operation window than is available for conventional devices. 相似文献
925.
Gehrels N Norris JP Barthelmy SD Granot J Kaneko Y Kouveliotou C Markwardt CB Mészáros P Nakar E Nousek JA O'Brien PT Page M Palmer DM Parsons AM Roming PW Sakamoto T Sarazin CL Schady P Stamatikos M Woosley SE 《Nature》2006,444(7122):1044-1046
Gamma-ray bursts (GRBs) are known to come in two duration classes, separated at approximately 2 s. Long-duration bursts originate from star-forming regions in galaxies, have accompanying supernovae when these are near enough to observe and are probably caused by massive-star collapsars. Recent observations show that short-duration bursts originate in regions within their host galaxies that have lower star-formation rates, consistent with binary neutron star or neutron star-black hole mergers. Moreover, although their hosts are predominantly nearby galaxies, no supernovae have been so far associated with short-duration GRBs. Here we report that the bright, nearby GRB 060614 does not fit into either class. Its approximately 102-s duration groups it with long-duration GRBs, while its temporal lag and peak luminosity fall entirely within the short-duration GRB subclass. Moreover, very deep optical observations exclude an accompanying supernova, similar to short-duration GRBs. This combination of a long-duration event without an accompanying supernova poses a challenge to both the collapsar and the merging-neutron-star interpretations and opens the door to a new GRB classification scheme that straddles both long- and short-duration bursts. 相似文献
926.
上个世纪的亚洲美学家们往往依据西方美学传统的基本模式来考察各种美学问题;但实际上,亚洲各国也有自己的与西方不同的美学传统。通过对中西美学传统的比较性考察,探讨中国美学在21世纪人类美学的总体发展中所具有的世界性意义。从中国美学的视点看,美不仅在人与审美对象的关系中具有单纯审美的意义,而且更在人的存在自身中具有形而上的意义;人不仅是审美对象和艺术作品的创造者,而且首先是人自身美的存在的创造者。事实上,只有当人自身的存在首先在形而上的意义上达到了美的层面时,人才有可能一方面在外部世界中创造出审美的对象,另一方面在内心世界中形成审美的心理。中国美学的这一洞见无疑能够大大扩展21世纪人类美学的理论视界和研究内容,使其超出西方美学传统的有限观念,甚至将其提升到人的存在的形而上层面,从而使其对人类的进步发展做出更大的贡献。 相似文献
927.
Y.Pazhuhanfar B.Eghbali 《矿物冶金与材料学报》2021,28(6):1080-1089
In the present research, aluminum metal matrix composites were processed by the stir casting technique. The effects of TiB2 rein-forcement particles, severe plastic deformation through accumulative roll bonding (ARB), and aging treatment on the microstructural charac-teristics and mechanical properties were also evaluated. Uniaxial tensile tests and microhardness measurements were conducted, and the micro-structural characteristics were investigated. Notably, the important problems associated with cast samples, including nonuniformity of the rein-forcement particles and high porosity content, were solved through the ARB process. At the initial stage, particle-free zones, as well as particle clusters, were observed on the microstructure of the composite. However, after the ARB process, fracturing phenomena occurred in brittle ceramic particles, followed by breaking down of the fragments into fine particles as the number of rolling cycles increased. Subsequently, com-posites with a uniform distribution of particles were produced. Moreover, the tensile strength and microhardness of the ARB-processed com-posites increased with the increase in the reinforcement mass fraction. However, their ductility exhibited a different trend. With post-deforma-tion aging treatment (T6), the mechanical properties of composites were improved because of the formation of fine Mg2Si precipitates. 相似文献
928.
929.
930.
F. B. De Jorge J. A. Petersen A. S. F. Ditadi 《Cellular and molecular life sciences : CMLS》1969,25(6):614-615
Résumé La composition de l'urine du pulmoné terrestreStrophocheilus oblongus musculus, spécialement le taux de l'urée, est un reflet des différences du contenu protéique des aliments. Ce fait confirme que le fonctionnement du rein des mollusques et des vertébrés est semblable. 相似文献