抗核辐射条件的应变计粘贴与防护技术

本文介绍了在重水反应堆中进行应变测量的若干技术成果，主要是较好地解决了用在核辐射条件下，有水流冲刷的环境中的应用变计的粘贴与防护技术。在具有核辐射的环境中测试，通常选用聚酰亚胺胶作粘结剂。但是这种胶需在高温条件下固化，如果被测构件较大，是无法实现的。经测试筛选出具有防水防辐射性能的常温固化胶，并介绍了可用航空导线替代具有抗辐射性能的铠装电缆在堆内进行测量问题。采用有关措施后，经标定，在核辐射前后应     

Morphology,thermal stability,and flammability of polymer matrix composites coated with hybrid nanopapers

In this study, a hybrid nanopaper consisting of carbon nanofiber (CNF) and polyhedral oligomeric silsequioxane (POSS) or cloisite Na⁺ clay, has been fabricated through the papermaking process. The hybrid nanopaper was then coated on the surface of glass fiber (GF) reinforced polymer matrix composites through resin transfer molding (RTM) process. The morphologies of the hybrid nanopaper and resulting nanocomposites were characterized with scanning electron microscopy (SEM). It can be seen that the nanopaper had a porous structure with highly entangled carbon nanofibers and the polyester resin completely penetrated the nanopaper throughout the thickness. The thermal decomposition behavior of the hybrid nanopapers and nanocomposites was studied with the real‐time thermogravimetric analysis/ flourier transform infrared spectrometry (TGA/FTIR). The test results indicate that the addition of pristine nanoclay increased the thermal stability of the nanopaper, whereas the POSS particles decreased the thermal stability of the nanopaper. The fire retardant performance of composite laminates coated with the hybrid nanopaper was evaluated with cone calorimeter tests using a radiated heat flux of 50 kW/m². The cone calorimeter test results indicate that the peak heat release rate (PHRR) decreased dramatically in composite laminates coated with the CNF‐clay nanopaper. However, the PHRRs of the CNF‐POSS nanopaper coated composite laminates increased. The formation of compact char materials was observed on the surface of the residues of the CNF‐clay nanopaper after cone calorimeter test. The flame retardant mechanisms of the hybrid nanopaper in the composite laminates are discussed. Copyright © 2009 John Wiley & Sons, Ltd.     

Room temperature deposition of amorphous SiC thin films using low energy ion bombardment

Silicon carbide (SiC) films are prepared by single- and dual-ion beam sputtering deposition at room temperature, respectively. An assisting argon ion beam (ion energy Ei=150 eV) bombards directly the substrate surface to modify the SiC film surface. The thin films are characterized by the Fourier transform infrared spectroscopy (FTIR) and the Raman spectra. With assisting ion beam bombardment, the density of the Si–C bond in the film increases. Meanwhile, the excess carbon or the size of the sp² bonded clusters and the amorphous Si (a-Si) phase decrease. These results indicate that the composition of the films is mainly Si–C bond. UV-vis transmission shows that the E_opt increases steadily from 1.85 eV for the amorphous SiC (a-SiC) films without bombardment to about 2.29 eV for those with assisting ion beam bombardment.     

浙江萧山、舟山和福建集美臭鼩血红蛋白、血清蛋白电泳比较研究

本文用血红蛋白的薄层等电聚焦技术对浙江萧山、舟山和福建集美的三地臭鼩进行比较,结果显示:大陆(萧山与集美)和海岛(舟山)之间的带谱存在差异.大陆有6条区带,海岛的带谱变化较大,存在四种不同类型.用血清蛋白的SDS-聚丙烯酰胺凝胶电泳技术和血清蛋白的薄层等电聚焦技术对上述三地臭鼩的分析表明:海岛个体血清蛋白的成份和在血液中相对含量较大陆为少,而大陆萧山和集美的血清蛋白在血液中的相对含量和成份亦略有不同.     

Initial study on the structure and photoluminescence properties of SiC films doped with Al

SiC films doped with aluminum (Al) were prepared by the rf-magnetron sputtering technique on p-Si substrates with a composite target of a single crystalline SiC containing several Al pieces on the surface. The as-deposited films were annealed in the temperature range of 400-800 °C under nitrogen ambient. The thin films have been characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results show that the introduction of Al into films hinders crystalline formation process. And with the increase of annealing temperature, more Si particles are formed in the films, which strongly affect the optical absorption properties. The photoluminescence (PL) spectra of the samples show two peaks at 370 nm and 412 nm. The intensities of the PL peaks are evidently improved after Al doped. We attribute the origin of the two PL peaks to a kind of Si-related defect centres. The obtained results are expected to have important applications in modern optoelectronic devices.     

钱塘江河口滩涂围垦区农田小兽种群分布格局初步研究

1987年8月和1989年8月对钱塘江河口滩涂围垦区农田小型兽类的凋查得知，农田小兽各种群的分布格局均为负二项分布.种群集聚度的大小依次为黄毛鼠.黑线姬鼠.臭的和大路助.在s种不同的农田类型中，各种群的集聚度有异，呈现不同的分布格局种群的集聚度与种群的密度、栖息地生境及群落结构之间都存在相互的影响.     

竹鸡鸣声特征分析

本文用计算机鸣声分析技术，从时域、频域和短时能量等方面对杭州地区竹鸡早春的鸣声特征进行了分析.竹鸡鸣叫一般有5-11声，每声均为3个音节，各声的时域波形和功率谱特性均不相同.开始鸣声短促，往后持续时间逐渐延长，末声是第1声的1. 82倍，主要是各音节之间的间隔时间和第，音节的持续时间逐次延长，而第I和第1音节的持续时间逐渐缩短.同时，相同音节的BS的MPF渐次降低，第I、I音节分别降低了33%和40%.随着声序的增加，各音节的Bw渐次变窄.从各音节的前48ms声段分析可知，三个音节的RA变化各不相同，SS。的RA渐趋升高，SS:的RA在第4,5声最高，}3的RA在第7,8声最高.每声的短时能量分布也不同，前几声各音节都有较高的能量，后来第，音节能量逐渐降低，第，音节能量渐渐后移.整个鸣叫过程中，纯音平均约占7100,频率变化范围约在1500-3120H:之间