耐酸性荧光增白剂在棉织物上的应用

本文比较了增白剂4BK，Argaphor MST liq.,Argaphor RSB liq.的色光、白度、耐酸性等应用特性，说明Argaphor MST liq.和Argaphor RSB liq.有良好的耐酸性和应用性能。     

Zn(MgBe)Se ultraviolet photodetectors

We present the growth and characterization of blue-violet and ultraviolet photodetectors based on ZnSe and Zn(Mg)BeSe compounds. Structures are grown by molecular beam epitaxy on (001) GaAs substrates. Three types of photodetectors have been fabricated. Zn(Mg)BeSe p-i-n photodiodes exhibit a high response of 0.17 A/W with a rejection rate of 10⁴ and a wavelength cutoff of 450 nm. Schottky barrier photodiodes based on planar geometry devices display a very flat response above the band gap with a rejection rate above 10³. High responses with quantum efficiency higher than 50% have been obtained. The wavelength cutoff can be tuned from 460 (ZnSe) to 380 nm (ZnMgBeSe), which leads to visible blind devices. Detectivities from 2.0 10¹⁰ (ZnMgBeSe) to 1.3 10¹⁰ mHz^1/2W⁻¹ (ZnSe) have also been measured. Metal-semiconductor-metal devices, recently fabricated, exhibit a spectral response very similar to Schottky devices. Quantum efficiencies of 40% are easily obtained in these devices with a rejection rate of 10³.     

聚丙烯紫外辐照气相接枝马来酸酐

在６０℃、氮气气氛下,用低能量紫外辐照聚丙烯,进行聚丙烯的气相马来酸酐接枝。红外分析显示,在所选择的实验条件下,马来酸酐已经接枝到聚丙烯的分子链上。用重量法计算了马来酸酐的接枝率。实验结果表明,接枝聚丙烯（ＰＰ－ｇ－ＭＡＨ）的熔体流动速率和马来酸酐的接枝率随紫外辐射时间的增加而增加;紫外辐照时间保持不变,ＰＰ－ｇ－ＭＡＨ的溶体流动速率基本相同。     

苯并三唑类紫外线吸收剂的研究进展

论述了应用最广泛的紫外线吸收剂苯并三唑类化合物在提高消光系数、引入可聚合基团以及和其它光稳定剂如受阻胺光稳定剂的协同作用等方面的研究进展。     

Bicarbonate Effect in the Ozone-UV Process in the Presence of Nitrate

Ozonation and advanced oxidation processes (AOP) are very efficient methods for the destruction of refractory organic matters. These virtues have always been related to the production of hydroxyl radicals HO^?, which are extremely powerful and non-selective oxidants. In this study, the O₃-UV process is used as an AOP, where hydroxyl radicals are generated from the photodecomposition of ozone by short wavelength ultraviolet radiation. The obtained results indicated a weak scavenging effect of tert-butanol proving that hydroxyl radicals and ozone are not the only oxidants existing in the medium. Moreover, bicarbonate, known for a long time as effective HO^? radical scavengers, does not slow down the oxidation of benzoic acid, but surprisingly increases it. Chlorides significantly decrease the degradation of organic compounds through their reaction with HO^? radicals to produce chlorine. Carbonate radicals, nitrate and nitrogenated species as peroxynitrite/?peroxynitrous acid are involved in the oxidative mechanisms.     

Infrared thermography (IRT) and ultraviolet fluorescence (UVF) for the nondestructive evaluation of ballast tanks’ coated surfaces

This paper quantifies the detectability limits of infrared thermography (IRT) and ultraviolet fluorescence (UVF) techniques in the thickness measurements of the naval protective coatings applied on ship ballast tanks. The change in signal per unit thickness (25 μm) is used to describe each technique resolution, when using a pulsed-thermographic procedure and a UVF spectroscopic analysis. Furthermore, Tanimoto criterion in addition to a local signal-to-noise ratio (SNR) computation measure the revealability of pinholes, the IRT technique provides an 83% revealability while the UVF imaging has a 66% value. The goal of this work is to benchmark the novel UVF approach against that of the IRT procedures.     

真丝织物光泛黄脆化时间函数的研究

真丝织物经不同时间的隔与不隔玻璃日照、淋雨与不淋雨条件下紫外光照射四种实验,结果表明,黄度与受照时间均呈乘幂函数关系,强伸度与受照时间均呈指数函数关系。     

A study of ultraviolet solar radiation at Cairo urban area, Egypt

The monthly mean values of global, G, and ultraviolet, UV, solar radiation incident on a horizontal surface at Cairo urban area during the two different periods (1969–1973) and (1993–1997) are presented, analyzed and compared. The effect of urbanization processes on the solar radiation components is investigated and discussed. It was found that the total radiation of the two components, G and UV received at the urban area of Cairo during the period (1969–1973) highly exceeds the radiation received during the period (1993–1997) for all months of the year. The mean relative reduction of G and UV reached 17.4% and 27.4% respectively. A significant correlation between G and UV radiation has been established and the recommended correlation equation has been stated to estimate the values of UV radiation that are difficult to measure at any site in the zone of Lower Egypt. Also, a comparative study of the two radiation components, G and UV, at urban (Cairo) and rural (Bahtim) areas during the period (1993–1997) revealed that the urban area always has values of G and UV radiation distinctly lower than that found in rural area for all months of the year. Urban–rural mean reduction of G and UV reached 7.0% and 17.9% respectively. The ratio of the ultraviolet to global radiation (UV/G) are calculated and compared with other sites in the Arabian Peninsula. The effect of atmospheric dust on the measured solar radiation components is also investigated and discussed.     

Estimation of solar radiation components incident on Helwan site using neural networks

Field testing carried out for solar energy applications is costly, time consuming and depends heavily on prevailing weather conditions. Adequate security and weather protection must be provided at the test site. Measurements may also suffer from delays that can be caused by system failures and bad weather. To overcome these problems the need for accurate model becomes evermore important. To achieve such prediction task, an artificial neural network, ANN, model is regarded as a cost-effective technique superior to traditional statistical methods. In this paper, Levenberg optimization function is adopted to predict insolation data in different spectral bands for Helwan (Egypt) monitoring station. The predicted values were then compared with the actual values and presented in terms of usual statistics. The results hint that, the ANN model predicted infrared, ultraviolet, and global insolation with a good accuracy of approximately 95%, 93% and 96%, respectively. In addition, ANN model was tested to predict the same components for Aswan over an 11 month period. The predicted values of the ANN model compared to the actual values for Aswan produced an accuracy of 95%, 91% and 92%, respectively. Data for Aswan were not included as a part of ANN training set. Hence, these results demonstrate the generalization capability of this approach over unseen data and its ability to produce accurate estimates.     

瑞士科莱恩（原山德山）公司的功能性整理剂（二）

二、卫生整理剂 应用科莱恩（原山德士）公司卫生整理剂生产的产品,其性能经该公司测试认可后,可以颁发国际公认的“Sanitized~R”吊牌,使消费者易于识别,也是质量可靠性的保证,这在国际市场上已流行多年了。 “Sanitized~R”整理剂有较强的抗菌性,其整理产品有耐久的广谱抑制微生物作用,以及防止螨虫所引起的各种过敏性反应,如日常生活中常见的红眼病、风疹块、过敏性哮喘等。该整理剂由多种抗菌防霉剂组合而成,不同用途的产品,可选用合适的Sanitized整理剂。用它整理的产品,在欧洲国家已有下列几方面: 1.服装方面 工作服、运动服、休闲服及