间戊二酮合钛（Ⅳ）配合物的应用研究

对二氯二（间戊二酮）合钛（Ⅳ）、间戊二酮合钛（Ⅳ）配合物的的结构、种类及应用进行介绍,并在初步分析其新特征后,指出了进一步研究的方向.     

论变式句在科技英语中的信息功能

以话语信息传递和语言交际功能理论为依据，通过遴选科技英语相关例证作为分析语料，从英语的科技文体视角探析了变式句在信息推进过程中的强调、平衡、衔接、话题导入、情景设定、渐次加强和焦点对比等功能，强调了谙熟这些信息功能对于提高科技英语的阅读、写作和翻译水平的重要性。     

国内外知识抽取系统解析

介绍了目前最流行的知识抽取方法,分析比较了Amilcare、TEXTRUNNER、Pythor、MnM、Text2Onto、SELKAS等知识抽取系统。     

“多元智能理论”在背越式跳高教学中的实验研究

在我国,体育院校的背越式跳高教学是田径普修课的主要内容之一,对于背越式跳高的教学方法研究很多,而运用多元智能理论于背越式跳高教学的却尚未见到,为此,本文正是把多元智能理论应用到田径普修课背越式跳高教学的实践当中,通过教学实验证实：背越式跳高教学中应用＂多元智能理论＂,能够改变传统教学中的很多不足,能有效提高教学质量.     

k分Cantor集C_k上p方可积函数空间L~P(C_k,μ)的可分性

文献[1]已知三分Cantor集C上p方可积函数空间LP(C,μ)(1≤p∞)是可分的,将此结论推广到k分Cantor集Ck(k为1的奇数)上,证明了k分Cantor集Ck上p方可积函数空间LP(Ck,μ)(1≤p∞)也是可分的.     

SER analysis and power allocation for hybrid cooperative transmission system

The symbol-error-rate(SER) and power allocation for hybrid cooperative(HC) transmission system are investigated.Closed-form SER expression is derived by using the moment generating function(MGF)-based approach.However,the resultant SER contains an MGF of the harmonic mean of two independent random variables(RVs),which is not tractable in SER analysis.We present a simple MGF expression of the harmonic mean of two independent RVs which avoids the hypergeometric functions used commonly in previous studies.Using the simple MGF,closed-form SER for HC system with M-ary phase shift keying(M-PSK) signals is provided.Further,an approximation as well as an upper bound of the SER is presented.It is shown that the SER approximation is asymptotically tight.Based on the tight SER approximation,the power allocation of the HC system is investigated.It is shown that the optimal power allocation does not depend on the fading parameters of the source-destination(SD) channel and it only depends on the source-relay(SR) and relay-destination(RD) channels.Moreover,the performance gain of the power allocation depends on the ratio of the channel quality between RD and SR.With the increase of this ratio,more performance gain can be acquired.     

Perfluoroalkyl substances in the blood samples from a male population of Sweden

Temporal trends of perfluoroalkyl substances （PFASs） have been determined in the blood samples from several countries globally including a female population in Sweden recently, yet little is known about the time trends in the blood levels of these compounds in Swedish male populations over recent years. In this study, the fourteen target PFASs consisted of four perfluorosulfonates （PFSAs） and ten perfluorocarboxylates （PFCAs） in the whole blood samples, collected from 153 Swedish elderly men during the period between 2008 and 2010, were analyzed via ultra-performance liquid chromatography-tandem mass spectrometry （UPLC-MS/MS）. As the dominant PFASs contaminants in the blood samples, perfluorooctane sulfo- nate （PFOS） showed the highest geometric mean （GM） at 8.5 ng/mL, ranging from 1.7 to 29 ng/mL, while blood perfluorooctanoic acid （PFOA） contained the GM of 1.8 ng/mL, ranging from 0.35 to 6.4 ng/mL. Both the levels of these two compounds were lower than those determined in the blood samples of Swedish elderly pop- ulations derived from the late 1990s. According to the temporal trend analysis, over the three years, the blood levels of PFOS in Swedish male populations declined 16 % per annum, while those of perfluoroundecanoic acid （PFUnDA） increased 6.1% per annum, which were con- sistent with those reported previously for the populations from other countries.     

Nanoscale structural and electronic evolution for increased efficiency in polymer solar cells monitored by electric scanning probe microscopy

Control of blend morphology at multi-scale is critical for optimizing the power conversion efficiency （PCE） of plastic solar cells. To better understand the physics of photoactive layer in the organic photovoltaic devices, it is necessary to gain understanding of morphol- ogy and the corresponding electronic property. Herein we report the correlation between nanoscale structural, electric properties of bulk heterojunction （BHJ） solar cells and the annealing-induced PCE change. We demonstrate that the PCE of BHJ solar cells are dramatically improved （from 1.3 % to 4.6 %） by thermal annealing, which results from P3HT crystalline stacking and the PCBM aggregation for interpenetrated network. The similar trend for annealing- induced photovoltage and PCE evolution present as an initial increase followed by a decrease with the annealing time and temperature. The surface roughness increase slowly and then abruptly after the same inflection points observed for photovoltage and PCE. The phase images in electric force microscopy indicate the optimized P3HT and PCBM crystallization for interpenetrating network formation considering the spectroscopic results as well. From the correlation between surface photovoltage, blend morphology, and PCE, we propose a model to illustrate the film structure and its evolution under different annealing conditions. This work would benefit the better design and optimization of the morphology and local electric proper- ties of solar cell active layers for improved PCE.