排序方式: 共有72条查询结果,搜索用时 15 毫秒
21.
22.
The aim of our study consisted in obtaining ZnO nanorods using a photonic crystal (PC) structure as substrate. For obtaining of such structures, a PC presenting with electroconductive properties was chosen. Thus, the first step was represented by the synthesis of a copper nanoparticles shell composed by a maximum of seven layers of inorganic particle. This core–shell structure was subsequently used for the generation of ZnO nanorods by electrochemical deposition. The obtained materials were characterized by SEM, dynamic light scattering, UV–Vis, and X-ray powder diffraction analysis. 相似文献
23.
24.
Sericin protein, although a valuable resource for many industries including cosmetics, pharmaceutical and biomedical, has been discarded as a waste in silk industry, causing environmental pollution. This paper describes determination of a membrane-based process for sericin recovery from cocoon cooking wastewaters (CCW) that will enable value-added utilization of waste sericin. The iso-electric point (pI) of sericin was found as 5–6, whose MW was distributed as 180–200, 70–80, 30–40 and 10–25 kDa. Prior to membrane filtration, sericin was separated from other impurities via centrifugation (CFG) followed by microfiltration (MF) in the pre-treatment stage, which also helped minimize post membrane fouling. Ultrafiltration (UF) and nanofiltration (NF) were adopted at a pH equal to pI of sericin. UF achieved partial recovery of sericin polypeptides at 37–60%, which was attributed to increased transmission of uncharged sericin polypeptides at their pI. On the other hand, NF achieved sericin recovery as high as 94–95%, containing all MW fractions. Severe flux decline was the major problem due to protein–membrane interactions and high sericin concentrations, where concentration polarization mainly had a dominant effect. Although flux declines were as high as 58–88% in UF and 70–75% in NF, flux recovery by at least 83% was achieved by chemical cleaning using NaOH and free chlorine. 相似文献
25.
Edina Berlinger Anita Lovas Péter Juhász 《Central European Journal of Operations Research》2017,25(4):743-770
This paper investigates the impact of state subsidy on the behavior of the entrepreneur under asymmetric information. Several authors formulated concerns about state intervention as it can aggravate moral hazard in corporate financing. In the seminal paper of Holmström and Tirole (Q J Econ 112(3):663–691, 1997) a two-player moral hazard model is presented with an entrepreneur initiating a risky scalable project and a private investor (e.g. bank or venture capitalist) providing outside financing. The novelty of our research is that this basic moral hazard model is extended to the case of positive externalities and to three players by introducing the state subsidizing the project. It is shown that in the optimum, state subsidy does not harm, but improves the incentives of the entrepreneur to make efforts for the success of the project; hence in effect state intervention reduces moral hazard. Consequently, state subsidy increases social welfare which is defined as the sum of private and public net benefits. Also, the exact form of the state subsidy (ex-ante/ex-post, conditional/unconditional, refundable/nonrefundable) is irrelevant in respect of the optimal size and the total welfare effect of the project. Moreover, in case of nonrefundable subsidies state does not crowd out private investors; but on the contrary, by providing additional capital it boosts private financing. These results are mainly due to the special mechanism imbedded in our model by which the private investor is able to transform even the badly designed state subsidies into a success fee which is optimal from the incentive point of view. 相似文献
26.
Eugeniu?Vasile Edina?RusenEmail author Alexandra?Mocanu Mariana?Patrascu Ioan?Calinescu 《Colloid and polymer science》2012,290(3):193-201
The present study presents two different methods to obtain hybrid material formed by the poly [styrene (ST)–poly(ethylene
glycol) methyl ether methacrylate (PEGMA) 1100] and silver (Ag0). The aim has been to cover the polymeric particles with Ag0 shell. The first method consisted of mixing Ag0 nanoparticles dispersion with poly (ST-PEGMA 1100) dispersion, while in the second method, the Ag0 nanoparticles have been generated in situ. The hybrid materials have been characterized by MO, dynamic light scattering,
scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray energy
dispersive spectrometry, and ultraviolet–visible spectrophotometry. The results confirm the obtaining of two types of morphologies.
In the first case, the nanoparticles have been arranged in the interspatial zones of the polymer particles, while in the second
method, the Ag0 nanoparticles have covered the polymer particles. Thus, the film obtained using the second method is more suitable for the
practical application, as a separation membrane, using the antiseptic properties of Ag0. 相似文献
27.
Feng Yu Vincent Tiing Tiong Le Pang Rusen Zhou Xiaoxiang Wang Eric R. Waclawik Kostya Ken Ostrikov Hongxia Wang 《中国化学快报》2019,30(5):1115-1120
Due to the synergistic effect between ZnS and Cu5Sn2S7, the ZnS can enhance electrochemical performance of pristine Cu5Sn2S7. 相似文献
28.
29.
Dnes Berta Magd Badaoui Sam Alexander Martino Pedro J. Buigues Andrei V. Pisliakov Nadia Elghobashi-Meinhardt Geoff Wells Sarah A. Harris Elisa Frezza Edina Rosta 《Chemical science》2021,12(40):13492
The RNA helicase (non-structural protein 13, NSP13) of SARS-CoV-2 is essential for viral replication, and it is highly conserved among the coronaviridae family, thus a prominent drug target to treat COVID-19. We present here structural models and dynamics of the helicase in complex with its native substrates based on thorough analysis of homologous sequences and existing experimental structures. We performed and analysed microseconds of molecular dynamics (MD) simulations, and our model provides valuable insights to the binding of the ATP and ssRNA at the atomic level. We identify the principal motions characterising the enzyme and highlight the effect of the natural substrates on this dynamics. Furthermore, allosteric binding sites are suggested by our pocket analysis. Our obtained structural and dynamical insights are important for subsequent studies of the catalytic function and for the development of specific inhibitors at our characterised binding pockets for this promising COVID-19 drug target.The RNA helicase (non-structural protein 13, NSP13) of SARS-CoV-2 is essential for viral replication, and it is highly conserved among the coronaviridae family, thus a prominent drug target to treat COVID-19. 相似文献
30.
Inside Cover: A Dynamic and Responsive Host in Action: Light‐Controlled Molecular Encapsulation (Angew. Chem. Int. Ed. 52/2016)
下载免费PDF全文
![点击此处可从《Angewandte Chemie (International ed. in English)》网站下载免费的PDF全文](/ch/ext_images/free.gif)