镶嵌型宽波束换能器

本文描述了一种用于水下运载体上的宽波束换能器的设计方法和实验结果。分析了影响波束开角的因素及变化趋势。所建立的模型可以设计不同工作频率的宽波束换能器。     

五种四环类抗生素的固体表面荧光法的研究

五种四环类抗生素的固体表面荧光法的研究解宏智，董川，刘长松，赵丽霞，杜学勤（山西大学化学系，太原，０３０００６）关键词固体表面荧光，碱性降解，四环类抗生素四环类抗生素的亲癌作用使其成为诊断和治疗肿瘤的荧光探针［１］，基于该类抗生素碱性降解速率的差异［...     

高频线阵的研制

本文描述了一种用于侧扫声纳的高频线列阵，该阵由中心频率分别为１００ＫＨｚ和５００ＫＨｚ的两部分构成。由于采用阵元加权排列和充分利用有效工作面积，该阵具有尖锐的主瓣，较高的主、副瓣比和较高的发射、接受灵敏度（１００ＫＨｚ时分别为１７４ｄＢ，５００ＫＨｚ时分另为１７４ｄＢ、－１８３ｄＢ），技术指标达到国外同类高频线阵的水平。满足侧扫声呐的尖波束、低副瓣、大功率、高灵敏度，深水（１００ｍ）使用的要求，本     

Heterogeneous Nucleation Induced by Capillary Wave During Acoustic Levitation

The rapid solidification of acoustically levitated drops of Pb-61.9 wt. %Sn eutectic alloy is accomplished. A surface morphology of spreading ripples is observed on a sample undercooled by 15 K. The ripples originate from the centre of sample surface, which is also the heterogeneous nucleation site for eutectic growth. The Faraday instability excited by forced surface vibration has brought about these ripples. They are retained in the solidified sample if the sound pressure level exceeds the threshold pressure required for the appearance of capillary waves. Theoretical calculations indicate that both the pressure and displacement maxima exist in the central part of a levitated drop. The pressure near the sample centre can promote heterogeneous nucleation, which is in agreement qualitatively with the experimental results.     

评Halliday等所著《Fundamentals of Phyrsics》（4th ed．）一书的艺术特色

引言：面对21世纪的到来，各高校都纷纷展开了“面向21世纪新教材”的研究和建设工作。“他山之石，可以攻玉”，我们谨把现代流行于美国的、由Halliday、Resniek、Walker三人合著的《Fundamentals of Physics》(第四版)中的一些特点给予介绍，以期对物理新教材的建设和研究工作有所借鉴。     

含磷芳基肟胺衍生物的合成及其生物活性

通过硫代磷酰氯和硫代磷酰基异硫氰酸酯与芳基肟胺化合物的反应合成了１９个新的芳基肟胺衍生物，并确证了其结构。初步生物活性测试表明它们具有一定杀菌活性。     

二氯化锰慢性染毒对大鼠脏器和血液元素含量的影响

用ＭｎＣｌ２水溶液通过气管和腹腔二条途径对Ｗｉｓｔａｒ大鼠染毒，气管染毒４个月，总量达（７４．４９～１８．５９）×１０－６，腹腔染毒４个月，总量达（１１４５．２６～５７２，４）×１０－６．采用原子吸收光谱法，测定了大鼠肝、脾、肺、肾、脑和血液中锰、钙、镁元素的含量．结果：脑、肺组织中锰元素含量显著高于对照组（Ｐ＜０．０５和Ｐ＜０．０１），脾脏钙元素和血液镁元素含量显著低于对照组（Ｐ＜０．０５和Ｐ＜０．０１）．提示：慢性锰中毒对脏器与血液中元素含量的影响不可忽视．     

武术套路运动技法的艺术思维本质与方式研究

运用文献资料、逻辑分析和推理法,揭示武术套路运动深层和内在的真实艺术思维本质与方式.研究发现,武术套路的艺术思维基于悠久的历史倾向性——中国人善于将实用技术艺术化.思维的实践来源足人脑对传统搏斗技法信息加工创编的活动过程,这个过程是武术套路创编者在自我意识下完成的,有必然的差异性,并决定了各拳种套路技法的多样与艺术化；辩证思维是主导方式,决定了各拳种武术套路技法的全面性、对立统一和发展变化性.科学地认识武术套路运动的艺术思维本质与方式,对更好地传承与可持续发展武术套路运动有重要的现实意义.     

High beam quality broad-area diode lasers by spectral beam combining with double filters

A modified spectral beam combining(SBC) approach based on double asymmetrical filters was proposed. By using this scheme, the high-order lateral modes at the edge of the far-field pattern can be suppressed in the external cavity, and the beam quality in the slow-axis direction was improved from 16.1 to 13.4 compared to the conventional SBC. In the meanwhile, the electrical-to-optical efficiency from the modified SBC was more than 40% with an output power of 34.1 W, which is similar to that of the conventional SBC.     

Vibration Characteristics of Acoustically Levitated Object with Rigid and Elastic Reflectors

Levitation stability is a crucial factor that influences acoustic levitation capability. We present two sample-including models for a single-axis acoustic levitator with either a rigid or elastic reflector. Numerical analysis shows that, with the rigid reflector, both the decay time from initial disturbance and the vibration amplitude increase with sample density, which is unfavorable for levitation stability. However, with the elastic reflector, the decay time and the vibration amplitude are greatly reduced by choosing appropriate parameters of the reflector. Experimental results agree well with theoretical predictions, indicating that levitation stability can be remarkably enhanced by replacing the rigid reflector with an elastic reflector.