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排序方式: 共有183条查询结果,搜索用时 15 毫秒
1.
The d.c. electrical conductivity of sodium vanadate, rubidium vanadate, cesium vanadate and their solid solutions sodium-rubidium
vanadate and sodium-cesium vanadate were studied by a two-probe method in the temperature range covering their transition
points. The electrical conductivity shows sharp change at the phase transition temperature of these materials. In NaVO3, RbVO3 and CsVO3, increase in d.c. conductivity is observed in the ferroelectric region while nonlinearities are observed above transition
temperatures. In solid solutions, the activation energy in the paraelectric state is higher than that in the ferroelectric
state and depends upon sodium concentration. 相似文献
2.
Hans E. Hoydonckx Dirk E. De Vos Suhas A. Chavan Pierre A. Jacobs 《Topics in Catalysis》2004,27(1-4):83-96
An overview is given of newly developed Lewis or Brønsted acid and base catalysts for esterification, transesterification and ester interchange reactions. The most relevant applications of these catalysts and reactions in the domain of renewable resources, in particular, oils and fats, are discussed. 相似文献
3.
In a recent paper [D.Chavan et al., Rev. Sci. Instrum. 81, 123702 (2010)] we have demonstrated that ferrule-top cantilevers, obtained by carving the end of a ferruled fiber, can be used for contact mode atomic force microscopy in ambient conditions. Here we show that those probes can provide tapping mode images at both room and cryogenic temperatures (12 K). 相似文献
4.
Tamrat Tesfaye Jonas K. Johakimu R. B. Chavan Bruce Sithole Deresh Ramjugernath 《Clean Technologies and Environmental Policy》2018,20(1):81-94
Reducing environmental impacts and obtaining economic benefits based on utilisation of waste materials are drivers for the implementation of cleaner production policies and technologies in food processing industries. Starch is a very versatile material with a wide range of applications in the food, pharmaceutical, textile, paper, cosmetic and construction industries. In Ethiopia, starch is widely used in the textile industry. To meet the starch demand, the country imports approximately 45% of the starch used in the country. Consequently, it is imperative to find additional sources of starch that could substitute for the amount of starch that is currently being imported. Mango seeds, a waste material that is disposed of after consumption of mangos, were studied for potential use as an alternative resource for starch production. The results showed that starch extraction from mango seeds was facile and a good quality product was obtained. The present study is concerned with a techno-economic analysis for industrial production of starch from mango seeds. The study shows that extraction of starch from waste mango seeds is feasible: the project is financially viable with an accounting rate of return of 83% and a break-even analysis of 78% with a payback period of 2 years. 相似文献
5.
6.
Tiribilli B Margheri G Baschieri P Menozzi C Chavan D Iannuzzi D 《Journal of microscopy》2011,242(1):10-14
We present a fibre-top probe fabricated by carving a tipped cantilever on an optical fibre, with the tip machined in correspondence of the fibre core. When approached to an optical prism illuminated under total internal reflection conditions, the tip of the cantilever detects the optical tunnelling signal, while the light coupled from the opposite end of the fibre measures the deflection of the cantilever. Our results suggest that fibre-top technology can be used for the development of a new generation of hybrid probes that can combine atomic force microscopy with scanning near field optical microscopy. 相似文献
7.
8.
G. Pennick B. Chavan B. Summers A. V. Rawlings 《International journal of cosmetic science》2012,34(6):567-574
Humectant and occlusive technologies have traditionally been used for the treatment of dry skin. Originally, non‐lamellar‐forming ingredients were used such as petrolatum but recent research has shown the advantage of using lamellar‐forming ingredients such as ceramides, pseudoceramides and phospholipids in the relief of dry skin. Nevertheless, the importance of using lipid‐phase transition inducers, such as long‐chain fatty acids, has not been studied clinically. The evaluation of a novel complex of lipophilic ingredients was of interest: cetyl alcohol, isostearyl isostearate, potassium cetyl phosphate, cetyl behenate and behenic acid. The combination of all these ingredients was shown to be more effective than any single component in water vapour transmission rate studies. This was thought to be owing to the formation of a unique structural organization of the lipids upon dry‐down from an O/W emulsion as was examined by X‐ray diffraction and optical microscopy. When evaluated clinically in a randomized double‐blind and vehicle‐controlled moisturization efficacy trial, this novel blend of ingredients was shown to not only improve the visible signs of skin dryness to a significantly greater extent than a comparable mineral oil‐containing vehicle but also then maintain a better skin condition during the regression no‐treatment phase of the study. This combination of ingredients offers a new technology option for the treatment of dry skin. 相似文献
9.
10.
R. Chavan G. Chitarin R.S. Delogu A. Encheva A. Gallo E.R. Hodgson L.C. Ingesson A. Le-Luyer J.B. Lister Ph. Moreau J.-M. Moret S. Peruzzo J. Roméro D.S. Testa M. Toussaint G. Vayakis R. Vila 《Fusion Engineering and Design》2009,84(2-6):295-299
The current status of the ITER magnetics diagnostic is summarised. The various risks are discussed on the basis of when they could be present during ITER operation and appropriate mitigation is reviewed. An implementation risk or common mode operation failure risk to the magnetic diagnostic can only be mitigated by diversity. All identified risks are being handled with ongoing research and development to minimise these risks. A reasonable level of design and manufacturing diversity has been therefore introduced in the procurement and installation plans, in order to optimise overall reliability avoiding dispersion of resources. 相似文献