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排序方式: 共有168条查询结果,搜索用时 15 毫秒
81.
Dorota Kostrzewa Agnieszka Dobrzyńska–Inger Edward Rój Karolina Grzęda Kazimierz Kozłowski 《Journal of the Institute of Brewing》2016,122(3):493-499
An isomerization process of the α‐acids contained in hop extract (with magnesium oxide, potassium hydroxide and magnesium peroxide as catalysts at ambient temperature) was carried out. The influence of two factors (the amount of applied catalyst and the isomerization time) was studied. Ultra‐high performance liquid chromatography was used for the evaluation of the isomerization process. The best results were obtained with magnesium oxide. In this case, the influence of the operating variables on the isomerization process and optimal process parameters were determined using statistical methods. The isomerization method described above could be carried out with high efficiency without heating and could be easily adopted and applied on an industrial scale. Copyright © 2016 The Institute of Brewing & Distilling 相似文献
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Raman spectra were used to estimate the sizes of microcrystalline regions in coal. A variety of different Polish coals were investigated by means of the laser Raman technique. To prevent decomposition of the coals in the laser beam, the rotating disc technique was used to obtain the spectra. Some i.r. spectra of the coals under investigation were also considered. The aromatic carbon content was determined by the method of Oelert. The results of both spectroscopic techniques were compared and found to lead to the same order of magnitude of microcrystalline regions. The Tuingstra and Koenig method used for evaluation of microcrystalline regions in coal was found to be applicable if infrared studies indicate a high value of the aromaticity coefficient, i.e. if aromatic bonds are predominant in the coal under investigation. 相似文献
85.
Krajewski Adam Sikorska-Senoner Anna E. Hejduk Leszek Banasik Kazimierz 《Water Resources Management》2021,35(3):881-896
Water Resources Management - The aims of this study are: i) to better understand the coupled interactions between land use changes, climate change and the aquatic ecosystem in a small agricultural... 相似文献
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Krzysztof Kecik Krzysztof Ciecielag Kazimierz Zaleski 《The International Journal of Advanced Manufacturing Technology》2017,89(1-4):133-144
We study the dynamics of a milling process of carbon fiber reinforced plastic based on experimental time series of cutting force with help of recurrence plots and recurrence quantifications methods. The two cases of composite machining are analyzed in detail. The first case is a milling of undamaged material, while the second is a milling of damaged material. The detailed recurrence analysis shows interesting results, and additionally some of all quantifications can be used to damage detection. 相似文献
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Kazimierz Gaj 《Clean Technologies and Environmental Policy》2017,19(9):2181-2189
This paper critically reviews and discusses the state-of-the-art technologies for the removal of siloxanes from biogas, which could be used to simultaneously remove other contaminants. The reasons for purifying biogas, the scope of this purification and the recommended (depending on the biogas utilization equipment) concentrations of volatile silicon-organic compounds are presented. Established and new promising methods of removing typical methylsiloxanes from biogases from municipal landfills and sewage sludge are characterized and analyzed. Their suitability for the simultaneous removal of other trace biogas impurities and possibilities of regenerating the spent sorbent are assessed. It is shown that the commonly used activated carbon is not suitable for comprehensive biogas treatment. On the basis of the analysis, an adsorption method using halloysite (a natural zeolite mineral) as an inexpensive, universal and regenerable adsorbent is proposed. The method can be used after physicochemical treatment to comprehensively purify biogas from methylsiloxanes, hydrogen sulfide, ammonia, halides and other technically and environmentally burdensome impurities. Some directions for further research in this regard and possible environmentally safe ways of utilizing the spent sorbent are indicated. 相似文献
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Tomasz Brylewski Aleksander Gil Anna Rakowska Sebastien Chevalier Anna Adamczyk Jaroslaw Dabek Andrzej Kruk Miroslaw Stygar Kazimierz Przybylski 《Oxidation of Metals》2013,80(1-2):83-111
The present study investigated the role of the reactive-element effect (REE) in improving the corrosion resistance, chromium vaporization rate, and electrical conductivity of the Fe–25Cr ferritic steel modified either by means of yttrium implantation or chemical deposition of yttrium oxide from metaloorganic compound vapors. The corrosion kinetics of the Fe–25Cr steel, both pure and modified, were determined under isothermal conditions in air and an Ar–H2–H2O gas mixture at 1,073 K. A significant improvement in corrosion resistance was observed after surface modification. XRD and SEM–EDS investigations showed that the protective Cr2O3 layer formed the main part of the scale. Measurements of Cr vaporization rate in the air–H2O gas mixture revealed that both surface modifications of the steel significantly suppressed the formation of volatile chromium compounds to a large degree. The yttrium-implanted steels oxidized both in air and the Ar–H2–H2O mixture were characterized by the lowest area specific resistance and thereby did not exceed the acceptable ASR level (0.1 Ω cm2) for interconnect materials in the temperature range of 973–1,073 K, unlike pure steel and the steel coated with Y2O3. 相似文献
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