塑料的EMI／RFI屏蔽

本文综述了防止电磁干扰和无线电频率干扰的塑料涂层的各种方法。当今,占主导地位的是镍基有机导电涂层,但化学沉铜/镍镀层对高性能产品如使用在保密和军事上的计算机更重要。在美国经济界,电子设备中塑料机壳的增长是最快的工业之一,结果使树脂的应用,模具和涂镀设备亦趋于增长。在现代工业趋于下降时,对电磁干扰(EMI)直接的进步取决于屏蔽的需要和装     

三维PDP放电过程数值模拟软件

介绍了三维PDP放电过程模拟软件，该软件可较真实地反映放电单元的实际情况，对放电性能进行优化设计，且具有通用性强、界面友好、使用方便、功能完善等特点。可对不同结构、不同气体成份、不同驱动电压及波形等情况进行计算。     

Mid—Infrared Optical Parametric Oscillator Based on All—Solid—State—Pumped Periodically Poled LiNbO

We report the tunable mid-infrared generation with a periodically poled LinbO3(PPLN).Using an all-solid-state pumped Nd:YVO4 laser as the pump source and a PPLN nonlinear crystal with grating periods of 28.2-30.8μm,we have achieved wavelength conversion in the 2.90-4.05μm spectral range by period tuning.The use of confocal cavity design has brought a compact,all-solid-state configuration with an average output powers of idler up to -200mW.The maximum power of 277mW was obtained at the wavelength of 3.35um.     

利用KTP晶体实现1.08μmNd：YAP激光器锁模

本文描述了利用ＫＴＰ晶体和腔的基波输出镜构成非线性镜实现１．０８μｍＮｄ：ＹＡＰ激光器的被动锁模。实验表明，这种新的锁模技术比用染料作可饱和吸收体的被动锁模技术有很多突出的优点，具有很大的发展潜力。实验测得锁模时基波１．０８μｍ输出２．４ｍＪ，二次谐波０．５４μｍ输出０．５ｍＪ（同样条件下的静态输出为２．５ｍＪ），基波脉冲的平均脉宽为４０ｐｓ。     

慢性铅中毒一例

详细问诊，为诊断慢性铅中毒提供了重要依据。     

海水中三丁基氟化锡(TBTF)的比色测定

三丁基氟化锡是国内外船底防污漆中广泛使用的毒料之一。对防污漆的深入研制,要求掌握防污漆中的毒料在海水中的渗出情况。然而,快速、简便的测定海水渗出液中微量TBTF的方法目前报导极少。二苯基卡巴腙已成功地被用于卤代二丁基锡的测定。本文以二苯基卡巴腙为显色剂测定了防污漆海水渗出液中的TBTF,取得了较为满意的结果。     

Comparison of(η~6-Fluoroarene)tricarbonylchromium Complexes with Their Chloro-analogs in Radical Aromatic Substitutions

Reactions of fluoroarene-Cr(CO)_3 complexes with SmI_2 andcarbonyl compounds in THF/HMPA at-40— -60℃ affordedthe corresponding radical aromatic substitution products in highyield. Compared to the corresponding chloroarene-Cr.(CO)_3complexes, fluoroarene-Cr(CO)_3 complexes showed a higher ef-ficiency and slightly lower regioselectivity.     

GEOENVIRONMENTAL CHARACTERS OF YELLOW (HUANGHE) RIVER SUSPENDED LOAD

Three important characters of the suspended load of the Yellow (Huanghe) River are discussed, i.e. its temporal fluctuation as a function of solar activity, its uneven spatial distribution along the main course and the inevitability of these phenomena as a natural earth process rather than a result of disturbed ecological system caused by human activity. Implications of this understanding with regard to the control of the Yellow River are also discussed.     

二氧化钛光催化体系中的羟基自由基的测定

通过ESR光谱测定表明TiO2悬浮液在紫外光照射下产生羟基自由基氧化物种.羟基自由基氧化酸性桃红(sulforhodamine B,SRB)使其褪色,在565 nm处用分光光度法测定其吸光度值的变化,可间接测定羟基自由基的生成量.确定了体系的最佳实验条件pH为2.5;SRB浓度为2.0×10-5mol/L;TiO2浓度为0.1 g/L;光照时间为12 min.采用抗坏血酸为羟基自由基清除剂,测定了其自由基清除率,表明拟定该体系可作为筛选抗氧化剂的方法之一.