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排序方式: 共有405条查询结果,搜索用时 0 毫秒
61.
Sassi Abdessamed Bachir Abdelmalik Bechkit Walid 《Wireless Personal Communications》2021,116(3):2169-2186
Wireless Personal Communications - The ability to predict the arrival and residence time of mobile users at a particular place is essential for the development of a wealth of new applications and... 相似文献
62.
Anatase nanocrystalline titania coatings were produced on cotton fabrics from alkoxide solutions using a low-temperature sol–gel process under ambient pressure. Titania coatings of the anatase form were obtained via a classical hydrolysis and condensation reaction of titanium isopropoxide that was followed by a boiling water treatment for 180 min. Spectroscopic and microscopic characterizations of the titania thin films showed that the anatase form is predominant throughout the film after the boiling water treatment and that the size of the grains is about 20 nm. The titania coating on fabrics is a promising process for use as an antibacterial photocatalyst in the textile industry. 相似文献
63.
Walid A. Daoud John H. Xin Xiaoming Tao 《Journal of the American Ceramic Society》2004,87(9):1782-1784
We successfully prepared transparent and durable superhydrophobic silica-coating films on cotton substrates at low temperatures. The coatings were produced via cohydrolysis and polycondensation of a hexadecyltrimethoxysilane (HDTMS), tetraethoxyorthosilcate (TEOS), and 3-glycidyloxypropyltrimethoxysilane (GPTMS) mixture. The hydrophobic properties of the nanocomposite coatings were determined using contact-angle and water-gain measurements. The water contact angle for the coated substrates was 141°, whereas, before coating, the contact angle was 0° because of the superhydrophilic nature of cotton. The nanocomposite coating has new applications in daily used materials, especially those with low heat resistance, such as textiles and plastics, and as an environmentally friendly water-repellent substitute for fluorine compounds. 相似文献
64.
65.
Walid Daniel Dib 《生活用纸》2017,(11):50-51
Enka Hijyen公司是土耳其一家新进入婴儿纸尿裤行业的生产商,其业务预计将在近期加速增长,目标是在未来几年能够满足本地和区域市场的需求。Enka Hijyen的母公司Imam Kayali控股集团成立于1928年。开始是一家出售汽车零件的小型父子商店,如今已实现指数式增长,扩大为拥有700多名员工的集团公司。ImamKayali控股集团在评估了不断变化的婴儿纸尿裤市场的复杂性和盈利空间后,于2016年第1季度开始涉足纸尿裤行业。 相似文献
66.
The influence of surface roughness on the efficiency of a cyclic potentiodynamic passivation (CPP) method employed to increase the general and pitting corrosion resistance of 316LVM stainless steel was investigated. The results show that a decrease in surface roughness of both the surface on which the passive film was formed naturally and by the CPP method, results in an increase in general corrosion resistance of the material, while for the CPP-modified surface, a notable increase in pitting corrosion resistance was also observed. It was further demonstrated that the CPP method is highly effective in increasing the general and pitting corrosion resistance of 316LVM, and that its efficiency does not depend on the surface roughness. 相似文献
67.
Walid Ibrahim 《Journal of Electronic Testing》2007,23(5):421-434
In today’s semiconductor industry, where time-to-profit is a critical factor to remain competitive, missing the tight market
window might have serious implications including the risk of product cancellation. This places severe pressure on every aspect
related to the design and the verification of semiconductor chips to get the design ready for manufacturing in the shortest
time possible. To avoid the need for costly corrective steps and silicon re-spins during post-silicon verification, thorough
pre-silicon verification is essential to catch any design fault and estimate the design overall reliability before the design
is manufactured. This paper presents a novel EDA tool that helps the verification team improve the verification process in
several ways. It can be used to generate useful statistics regarding the complexity and the coverage of the created test vectors.
Experimental results prove that the verification team can successfully use the proposed tool to set their target coverage
and intelligently select the set of test vectors that achieves that target using the minimum number of computing cycles.
相似文献
Walid IbrahimEmail: |
68.
Salma Sultan Walid Mottawea JuDong Yeo Riadh Hammami 《International journal of molecular sciences》2021,22(23)
Over the past decade, gut microbiota dysbiosis has been linked to many health disorders; however, the detailed mechanism of this correlation remains unclear. Gut microbiota can communicate with the host through immunological or metabolic signalling. Recently, microbiota-released extracellular vesicles (MEVs) have emerged as significant mediators in the intercellular signalling mechanism that could be an integral part of microbiota-host communications. MEVs are small membrane-bound vesicles that encase a broad spectrum of biologically active compounds (i.e., proteins, mRNA, miRNA, DNA, carbohydrates, and lipids), thus mediating the horizontal transfer of their cargo across intra- and intercellular space. In this study, we provide a comprehensive and in-depth discussion of the biogenesis of microbial-derived EVs, their classification and routes of production, as well as their role in inter-bacterial and inter-kingdom signaling. 相似文献
69.
Walid Bahloul Flavien Mélis Véronique Bounor-Legaré Philippe Cassagnau 《Materials Chemistry and Physics》2012
Polypropylene/titanium dioxide (PP/TiO2) nanocomposites can be prepared using a novel method based on the hydrolysis–condensation reactions (sol–gel method) of titanium alkoxide inorganic precursors that have been premixed with polypropylene under molten conditions. The resultant nanocomposites were characterised by transmission electronic microscopy (TEM), X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). These techniques showed the formation of the titanium oxi-hydroxide chemical structure (TixOy(OH)z) with a diameter of approximately 10 nm in the polymer matrix. Furthermore, a condensation degree of around 17% was determined using XPS analysis. The antibacterial activity was tested according to the JIS Z 2801:2000 standard with Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) in the absence of light. Correlations between the microstructure and the chemical composition of PP/TiO2 nanocomposites and the antibacterial properties of these nanocomposites were discussed. The structure of titanium oxi-hydroxide derivative particles (TixOy(OH)z) within the polypropylene matrix has been shown to impact strongly on the antibacterial properties in comparison with the results obtained with a dispersion of anatase titanium dioxide into the PP. 相似文献
70.
Whether an industrial organisation is involved with production of new goods or engaged in reverse logistics to recycle used products, the items produced that do not meet specifications can cost the organisation in many different ways. The administrative expenses of handling returned items and the cost of reworking the items that have failed in plant quality control or returned by customers can be of concern to the manufacturers. While these are measurable costs, there are other costs such as loss of customers’ good will which are hard, if not impossible, to estimate. The model presented in this paper is aimed at optimising the measurable cost of reworking/scrapping the off-specification items as well as the cost of adjusting manufacturing processes with the aim of reducing or eliminating rejected pieces. The adjustment of process specification in relation to customer specification is a strategy that can affect production and quality cost. Consideration for optimal production specification is one of the elements of the model presented in this paper. In the proposed model, the direct cost of poor quality has been represented by a symmetrical truncated loss function. We have considered investment to adjust the mean and variance of the process. A numerical example is presented to demonstrate how the model can work in a real-world setting. 相似文献