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排序方式: 共有70条查询结果,搜索用时 15 毫秒
1.
Hernan Riquelme 《Creativity & Innovation Management》2000,9(1):14-20
What factors help and hinder creativity within the strategic planning process? An exploratory study examined the strategic plans of groups of graduates for their own business school. The students were assessed for rigidity of cognitive orientation, and divided into open‐minded groups, and two other groups of more rigid orientation. Strategic plans were rated for originality and relevance. An open minded orientation affected the production of a strategic plan in a positive way. The productivity (quantity) of the more closed‐mind type of group was enhanced in the elaboration of a strategic plan through interventions introducing creativity. The quality of production was only marginally enhanced. We conclude that creativity‐enhancing techniques had a marginal direct effect on efforts to deal with ill‐defined problems such as a strategic plan. Additional indirect effects (by influencing rigid cognitive orientation) may be occurring. 相似文献
2.
Orthogonal Translation Meets Electron Transfer: In Vivo Labeling of Cytochrome c for Probing Local Electric Fields 下载免费PDF全文
Jan Völler Dr. Hernan Biava Prof. Beate Koksch Prof. Peter Hildebrandt Prof. Nediljko Budisa 《Chembiochem : a European journal of chemical biology》2015,16(5):742-745
Cytochrome c (cyt c), a redox protein involved in diverse fundamental biological processes, is among the most traditional model proteins for analyzing biological electron transfer and protein dynamics both in solution and at membranes. Studying the role of electric fields in energy transduction mediated by cyt c relies upon appropriate reporter groups. Up to now these had to be introduced into cyt c by in vitro chemical modification. Here, we have overcome this restriction by incorporating the noncanonical amino acid p‐cyanophenylalanine (pCNF) into cyt c in vivo. UV and CD spectroscopy indicate preservation of the overall protein fold, stability, and heme coordination, whereas a small shift of the redox potential was observed by cyclic voltammetry. The C≡N stretching mode of the incorporated pCNF detected in the IR spectra reveals a surprising difference, which is related to the oxidation state of the heme iron, thus indicating high sensitivity to changes in the electrostatics of cyt c. 相似文献
3.
TiO<Subscript>2</Subscript> nanocrystals grown on graphene as advanced photocatalytic hybrid materials 总被引:2,自引:0,他引:2
Yongye Liang Hailiang Wang Hernan Sanchez Casalongue Zhuo Chen Hongjie Dai 《Nano Research》2010,3(10):701-705
A graphene/TiO2 nanocrystals hybrid has been successfully prepared by directly growing TiO2 nanocrystals on graphene oxide (GO) sheets. The direct growth of the nanocrystals on GO sheets was achieved by a two-step
method, in which TiO2 was first coated on GO sheets by hydrolysis and crystallized into anatase nanocrystals by hydrothermal treatment in the second
step. Slow hydrolysis induced by the use of EtOH/H2O mixed solvent and addition of H2SO4 facilitates the selective growth of TiO2 on GO and suppresses growth of free TiO2 in solution. The method offers easy access to the GO/TiO2 nanocrystals hybrid with a uniform coating and strong interactions between TiO2 and the underlying GO sheets. The strong coupling gives advanced hybrid materials with various applications including photocatalysis.
The prepared graphene/TiO2 nanocrystals hybrid has superior photocatalytic activity to other TiO2 materials in the degradation of rhodamine B, showing an impressive three-fold photocatalytic enhancement over P25. It is
expected that the hybrid material could also be promising for various other applications including lithium ion batteries,
where strong electrical coupling to TiO2 nanoparticles is essential. 相似文献
4.
5.
M Sukumar M Bommaraju JE Fisher FC Morin MC Papo BP Fuhrman LJ Hernan CL Leach 《Canadian Metallurgical Quarterly》1998,84(1):327-334
Partial liquid ventilation using conventional ventilatory schemes improves lung function in animal models of respiratory failure. We examined the feasibility of high-frequency partial liquid ventilation in the preterm lamb with respiratory distress syndrome and evaluated its effect on pulmonary and systemic hemodynamics. Seventeen lambs were studied in three groups: high-frequency gas ventilation (Gas group), high-frequency partial liquid ventilation (Liquid group), and high-frequency partial liquid ventilation with hypoxia-hypercarbia (Liquid-Hypoxia group). High-frequency partial liquid ventilation increased oxygenation compared with high-frequency gas ventilation over 5 h (arterial oxygen tension 253 +/- 21.3 vs. 17 +/- 1.8 Torr; P < 0.001). Pulmonary vascular resistance decreased 78% (P < 0.001), pulmonary blood flow increased fivefold (P < 0.001), and aortic pressure was maintained (P < 0.01) in the Liquid group, in contrast to progressive hypoxemia, hypercarbia, and shock in the Gas group. Central venous pressure did not change. The Liquid-Hypoxia group was similar to the Gas group. We conclude that high-frequency partial liquid ventilation improves gas exchange and stabilizes pulmonary and systemic hemodynamics compared with high-frequency gas ventilation. The stabilization appears to be due in large part to improvement in gas exchange. 相似文献
6.
Alfonso Valenzuela Susana Nieto Bruce K. Cassels Hernan Speisky 《Journal of the American Oil Chemists' Society》1991,68(12):935-937
The antioxidative effect of boldine, an alkaloid extracted fromPeumus boldus Mol. (boldo), was assayed on the spontaneous and on the metal-induced oxidation of fish oil. The inhibitory effect of boldine
was compared to those of dl-α tocopherol, the flavonoid quercetin and the synthetic antioxidants butylated hydroxytoluene
and butylated hydroxyanisole. Boldine, in all assays, showed a good antioxidative effect, which was comparable to that of
quercetin and even better than that of dl-α tocopherol and the synthetic antioxidants. Additive effects were observed when
mixtures of boldine and quercetin or dl-α tocopherol were assayed. The present study supports the potential use of boldine
as a novel natural antioxidant for fish oil. 相似文献
7.
Experimental Response of Externally Retrofitted Masonry Walls Subjected to Shear Loading 总被引:1,自引:0,他引:1
Recent earthquakes have produced extensive damage in a large number of existing masonry buildings, demonstrating the need for retrofitting masonry structures. Externally bonded carbon fiber is a retrofitting technique that has been used to increase the strength of reinforced concrete elements. Sixteen full-scale shear dominant clay brick masonry walls, six with wire-steel shear reinforcement, were retrofitted with two configurations of externally bonded carbon fiber strips and subjected to shear loading. The results of the experimental program showed that the strength of the walls could be increased 13–84%, whereas, their displacement capacity increased 51–146%. This paper presents an analysis of the experimental results and simple equations to estimate the cracking load and the maximum shear strength of clay brick masonry walls, retrofitted with carbon fiber. 相似文献
8.
Hans Gonzalez Sebastian Caro Mario Toledo Hernan Olguin 《International Journal of Hydrogen Energy》2018,43(9):4294-4304
The production of syngas from biogas (surrogate of CH4/CO2: 55/45 v/v) and polyethylene in a porous media combustion reactor is experimentally studied. The employed setup is novel and has not been studied before. A semi-continuous feed of solid fuel and a constant filtration velocity of the gaseous reactants of 17 cm/s were considered. Temperature, velocity of propagation, and composition of the syngas produced in the combustion waves were registered in a tubular reactor packed with a ceramic foam porous medium and two solid fuel inlets. In the first part of the study, a baseline determined by the filtration combustion of a biogas/air mixture through the ceramic foam at the equivalence ratio () range , having transient (upstream and downstream) and stationary combustion wave propagation regimes, is established. In the second part of this work, portions of the ceramic foam in two different separated zones are extracted, leaving space for the semi-continuous supply of polyethylene. In this second part the biogas-air combustion was performed only for and . Although the combustion temperature decreased by the presence of polyethylene, it was found that the syngas (both H2 and CO) yield was larger than for the baseline. The highest degrees of conversion to hydrogen and carbon monoxide was reached under the presence of polyethylene, having 45% and 67% for , and 45% and 60% for , respectively. These results are very promising and they demonstrate the capabilities of the presented methodology and experimental setup, which should encourage future attempts of applications of the technology. 相似文献
9.
We present a new approach for fabricating multilayer microfluidic devices in poly(methyl methacrylate). Paraffin wax was used as a phase-changing sacrificial layer to protect microstructures during solvent bonding. Microchannels in the top and bottom pieces were aligned with through-holes in the middle layer, resulting in microchannels that cross one another. No discernible delamination of the layers or leakage between channels was observed at pressures as high as 300 psi. The current versus voltage linearity in the crossover channel indicates that no Joule heating occurs at voltages of at least 2.0 kV. Moreover, a potential in the crossover channel did not affect the current in the separation channel. Rapid and efficient separation of fluorescently labeled amino acids was performed in these devices. Pressurized buffer flow or voltage applied in the crossover channel caused no leakage into or electrical interference with the separation channel. Our results demonstrate that sacrificial layers with solvent bonding can be implemented readily in the fabrication of robust and fluidically complex multilayer polymer microchips. These capabilities should facilitate the development of a new generation of sophisticated microfluidic systems. 相似文献
10.
Tabakman SM Chen Z Casalongue HS Wang H Dai H 《Small (Weinheim an der Bergstrasse, Germany)》2011,7(4):499-505
Surface-enhanced Raman scattering (SERS) vastly improves signal-to-noise ratios as compared to traditional Raman scattering, making sensitive assays based upon Raman scattering a reality. However, preparation of highly stable SERS-active gold substrates requires complicated and expensive methodologies and instrumentation. Here, a general and completely solution-phase, seed-based approach is introduced, which is capable of producing gold films for SERS applications on a variety of substrates, not requiring surface modification or functionalization. SERS enhancement factors of ≈10(7) were observed. Moreover, solution-phase gold film deposition on highly complex surfaces, such as protein-coated bioassays, is demonstrated for the first time. Protein bioassays coated with such SERS-active gold films are combined with bioconjugated single-walled carbon nanotube Raman labels, affording highly sensitive detection of the cancer biomarker, carcinoembryonic antigen in serum, with a limit of detection of ≈5 fM (1 pg mL(-1) ). 相似文献