Be^＋＋离子基态非相对论能量和波函数的变分计算

采用了一种包含坐标张弛系数的试探波函数，对Be^ 离子的基态能量和解析波函数进行了变分计算，得到了比较理想的结果。     

电荷补偿对Sr_2SiO_4∶Dy~(3+)材料发射光谱的影响

采用高温固相反应方法在空气中制备了Sr2SiO4∶Dy^3＋发光材料。在365 nm紫外光激发下,测得Sr2SiO4∶Dy^3＋材料的发射光谱为一多峰宽谱,发射峰分别位于486,575和665 nm处。研究了电荷补偿剂Li^＋,Na^＋和K^＋对Sr2SiO4∶Dy^3＋材料发射光谱强度的影响,结果显示,不同电荷补偿剂下,随电荷补偿剂掺杂浓度的增大,Sr2SiO4∶Dy^3＋材料发射光谱强度的演化趋势相同,即,Sr2SiO4∶Dy^3＋材料发射峰强度先增大后减小,但不同电荷补偿剂下,材料发射峰强度最大处对应的补偿剂浓度不同,对应Li^＋,Na^＋和K^＋时,浓度分别为4 mol%,3 mol%和3 mol%。同时,对研究结果进行了理论分析。     

基于VC++和MATLAB的氢原子光谱数据处理系统

在氢原子光谱实验中,由色散规律求氢原子光谱波长的数据处理十分复杂。本文利用3次样条插值和误差随机化方法来进行数据处理。利用VC++和MATLAB的混合编程,建立氢原子光谱数据处理系统。该系统充分发挥了VC++在界面设计上的优势,同时利用MATLAB处理复杂数据和表达图像的能力,因此该系统结构合理、使用方便。     

He+和He2+离子与碱金属原子Li碰撞中的靶激发

本文在q×(20—150)keV的能量范围内,通过光学测量,对He⁺和He²⁺离子与碱余属原子Li碰撞过程中的靶激发过程进行了研究。由光学多道分析系统(OMA),测得LiI 670.8nm(2p→2s),LiI610.4nm(3d→2p),LiI460.3nm(4d→2p)和LiI812.6nm(3s→2p)谱线。给出所观察到的谱线的发射截面和相立的Li(2p)激发截面。对He⁺与Li碰撞过程,LiI670.8nm谱线发射截面与Aumayr 关键词：     

LnAlO3中Ce3+,Tb3+,Dy3+的发光及Ce-Tb,Ce-Dy的敏化发光(Ln=La,Gd,Y)

本文采用BaF2作为助熔剂和抑制剂经固相反应合成了一系列以LnAlO3(Ln=La,Gd,Y)为基质的磷光体,系统地研究了LnAlO3中Ce3+,Tb3+,Dy3+的发光及Ce-Tb,Ce-Dy的敏化发光,发现随Ln的不同,LnAlO3作为基质对激活剂的发光性质的影响也不同,本文得到一些规律性结果,并作了讨论。     

H＋/K＋-ATP酶抑制剂苯并咪唑类药物的分子光谱研究

H＋/K＋-ATP酶抑制剂对于胃溃疡治疗具有划时代意义, 我们对其中四种苯并咪唑药物的红外光谱进行分析,对药物结构与光谱特征相关性作探讨分析, 研究表明药物的红外谱图指纹特征吸收提供了有关分子结构的有用信息, 为药物分子的结构确定和新药物开发提供重要的依据。     

He+和He2+离子与碱金属原子Na碰撞中靶激发过程的实验研究

本文通过光学方法,在q×(20—140)keV能量范围内,研究了He⁺和He²⁺离子与碱金属原子Na碰撞中的靶激发过程。通过光学多道分析系统(OMA),对He⁺与Na碰撞过程,观察到NaI589.0+589.6nm(3p→3s),NaI818.3nm(3d→3p)和NaI568.8nm(4d→3p)等谱线。对He²⁺与Na碰撞过程,只观察到NaI589.0+589.6nm谱线。计算了所有观察到的谱线的发射截面和Na(3 关键词：     

一种新型固体Q开关Cr4＋∶YAG的实验研究

对一种适用于Ｎｄ３＋∶ＹＡＧ激光系统的新型被动Ｑ开关掺铬钇铝石镏石（Ｃｒ４＋∶ＹＡＧ）进行了实验研究，得到单脉冲能量为１４５ｍＪ、脉宽为３０～４０ｎｓ、效率接近１％、动静比达４０％以上的结果。     

NaF和NaF：Mg^＋＋晶体色心光致电离研究

用337nm、380nm和510nm脉冲激光照射着色NaF和NaF:Mg~(++)晶体,皆能产生大量F_2~+心.在照射过的NaF:Mg~(++)晶体中,观测到了F_2~+ 心向(F_2~+)~*心的转型现象.     

BaMgF4中Gd3+的光谱以及Gd3+和Tb3+离子之间的能量传递

本文在室温下研究了BaMgF4氟化物中Gd3+和Tb3+离子的荧光光谱以及它们之间的能量传递。在BaMgF4中Gd3+可以直接将激发能传递给Tb3+离子:在Tb3+(4f75d)-Gd3+(4f)-Tb3+(4f8)能量输运过程中,Gd3+离子可起中间体作用。     

Multifractal detrended fluctuation analysis of the Chinese stock index futures market

Based on the multifractal detrended fluctuation analysis (MF-DFA) and multifractal spectrum analysis, this paper empirically studies the multifractal properties of the Chinese stock index futures market. Using a total of 2942 ten-minute closing prices, we find that the Chinese stock index futures returns exhibit long-range correlations and multifractality, making the single-scale index insufficient to describe the futures price fluctuations. Further, by comparing the original time series with the transformed time series through shuffling procedure and phase randomization procedure, we show the existence of two different sources of the multifractality for the Chinese stock index futures market. Our results suggest that the multifractality is mainly due to long-range correlations, although the fat-tailed probability distributions also contribute to such multifractal behaviour.     

硅镁凝胶对杉木的强化及固着机制研究

硅镁凝胶浸渍改性杉木在物理力学性能方面提升较佳,探究硅镁凝胶在杉木中的固着性能和机制,对后续研究与创新具有一定意义。以硅镁凝胶为改性药剂,人工林杉木为基材,浸渍干燥后制得改性杉木。通过FTIR和XPS分析杉木素材和改性杉木的化学成分和结合方式,并对硅镁凝胶在木材中的分布以及改性杉木的渗透性进行探讨。实验结果表明：硅镁凝胶浸渍改性杉木的物理力学性能得到明显改善,密度均达到0.5 g·cm-3以上,抗压强度和抗弯强度相比杉木素材分别提升了99.73%和58.48%,端面硬度从3 659 N提升到5 843 N,基本已达到中等木材的性能指标。EDS结果证明药剂在杉木细胞腔中填充状况良好,Si,O,Na和Mg等主要元素与浸渍药剂硅镁凝胶相符且分布均匀。对浸洗前后的改性杉木试样和素材分别进行分层XPS测试,改性材的O/C增大,各元素在不同深度的含量十分接近,硅镁凝胶在杉木中分布均匀,具有良好的渗透性;浸洗后Si元素含量稳定,而钠元素有所降低,可能是部分钠盐的溶解流失造成,且不同深度的元素含量变化趋于一致,改性杉木的抗流失性较好。相比于硅酸钠浸渍改性杉木,硅镁凝胶改性杉木在96 h流失率降低到10.8%,抗流失效果较好。FTIR测试结果表明硅酸钠溶液对杉木的木质素和半纤维素有破坏和脱出作用,对杉木的通透性有所改善,且更容易与药剂形成化学键结合。C,O和Si元素的XPS谱图结果表明,改性后C(1s)向低结合能偏移,性质更加稳定,O—H结合大量减少,Si—O结合增多,硅镁凝胶能够在杉木中形成稳定的Si—O—C化学结构,药剂能够在细胞壁上实现高效固着。研究结果为改性材的药剂流失性检测和固着性研究提供新的思路,为硅镁凝胶浸渍改性杉木后续研究提供一定的理论支持。     

基于互相关算法的飞机导线故障诊断与定位系统设计

以飞机导线短路故障和断路故障为研究对象,目的在于寻求一种测试方法能够提高应用时域反射测量原理进行故障诊断与定位的精度。按照实际机场工程应用背景,设计了以便携式工控机为控制核心、以LabVIEW为驱动软件的飞机导线故障诊断与定位系统。根据信号传播特性,提出了基于互相关算法的故障定位方法,消除了系统误差的影响。计算机仿真和实物测试结果表明该系统具有测试过程方便、准确性高的优点,为提高民航机务维修质量具有促进作用。     

Dynamic Analyses of Contagion Risk and Module Evolution on the SSE A-Shares Market Based on Minimum Information Entropy

The interactive effect is significant in the Chinese stock market, exacerbating the abnormal market volatilities and risk contagion. Based on daily stock returns in the Shanghai Stock Exchange (SSE) A-shares, this paper divides the period between 2005 and 2018 into eight bull and bear market stages to investigate interactive patterns in the Chinese financial market. We employ the Least Absolute Shrinkage and Selection Operator (LASSO) method to construct the stock network, compare the heterogeneity of bull and bear markets, and further use the Map Equation method to analyse the evolution of modules in the SSE A-shares market. Empirical results show that (1) the connected effect is more significant in bear markets than bull markets and gives rise to abnormal volatilities in the stock market; (2) a system module can be found in the network during the first four stages, and the industry aggregation effect leads to module differentiation in the last four stages; (3) some stocks have leading effects on others throughout eight periods, and medium- and small-cap stocks with poor financial conditions are more likely to become risk sources, especially in bear markets. Our conclusions are beneficial to improving investment strategies and making regulatory policies.     

A study of high front vowels with articulatory data and acoustic simulations

The purpose of this study is to test a methodology for describing the articulation of vowels. High front vowels are a test case because some theories suggest that high front vowels have little cross-linguistic variation. Acoustic studies appear to show counterexamples to these predictions, but purely acoustic studies are difficult to interpret because of the many-to-one relation between articulation and acoustics. In this study, vocal tract dimensions, including constriction degree and position, are measured from cinéradiographic and x-ray data on high front vowels from three different languages (North American English, French, and Mandarin Chinese). Statistical comparisons find several significant articulatory differences between North American English /i/ and Mandarin Chinese and French /i/. In particular, differences in constriction degree were found, but not constriction position. Articulatory synthesis is used to model the acoustic consequences of some of the significant articulatory differences, finding that the articulatory differences may have the acoustic consequences of making the latter languages' /i/ perceptually sharper by shifting the frequencies of F(2) and F(3) upwards. In addition, the vowel /y/ has specific articulations that differ from those for /i/, including a wider tongue constriction, and substantially different acoustic sensitivity functions for F(2) and F(3).     

激光波长对煤激光诱导击穿光谱特性影响的试验研究

我国电站入炉煤种复杂多变,实时快速获取煤质成分对保障锅炉的安全、高效、低污染运行具有重大意义。将激光诱导击穿光谱(LIBS)技术应用于燃煤煤质测量,观测了不同波长激光(355,532和1 064 nm)诱导产生的等离子体时间演变特性和不同电离特性元素的谱线时间特性,对比了出现屏蔽效应时的能量阈值随激光波长的变化特征,并研究了激光波长对煤LIBS光谱特性的影响规律。结果发现：使用532 nm激光作为激发光源时,煤LIBS光谱具有最强的谱线信号强度,且出现等离子体屏蔽效应的能量阈值也较高,是一种较理想的激发光源,为LIBS技术在煤质测量领域的工业应用提供了实验依据。     

Atomic force microscope tracking observation of Chinese hamster ovary cell mitosis

CHO cells possess easily identifiable karyotypes, and CHO cell chromosomes are large and few in number, making these cells ideal for mutational and drug toxicity studies and suitable for investigations of animal chromosome structure. Here, we used atomic force microscopy (AFM) in the tapping mode for detailed visualizations of Chinese hamster ovary (CHO) cell chromosomes during various mitotic phases, including typical prophase, prometaphase, metaphase, anaphase and telophase. Based on our detailed observations, we were able to divide metaphase and anaphase into sub-phases: metaphase I, II and III, and anaphase I and II. Furthermore, we used the AFM error-signal mode to visualize chromosomal ultrastructures and cytokinesis. While these visualizations were all successful, we found that the image quality was affected by cellular debris, contamination. Collectively, our results show that the AFM technique has great potential for the detailed study of chromosomes and chromosomal ultrastructures during all phases of the cell cycle, but that careful standards of sample preparation must be maintained.     

主编的话

Happy New Year! As many of you are aware that Chinese science is at the crucial stage of development. We are now seeing more and more high quality works being produced by Chinese scientists working in China. However, high quality scientific works are rarely published in Chinese scientific journals so far. Therefore, the development of scientific journals publishing in China now becomes a more and more important indication of the science development in China. In the development of the chemical physics research field in China, the Chinese Journal of Chemical Physics (CJCP) has made significant contributions in the past 18 years. Since CJCP is primarily a Journal published in Chinese previously, its impact in the international scientific community has been quite limited. At this moment, we believe CJCP should increase its impact in the international community. We believe that making CJCP an English journal is a crucial step to increase its in°uence internationally. Therefore, upon the recommendation of senior editorial members, we now change CJCP into an full English journal from this issue on. We have also formed a high quality editorial board to help the editorial matters in CJCP, and a prestigious advisory board to advise us of the future development. I am very honored to be selected as the new Editor-in-Chief for the next four years. I hope by the end of my term, the impact of this journal is significantly improved through the efforts of our editorial team. Building a high quality scientific journal is not an easy task. I hope that every member of our chemical physics community can provide strong support to this journal by sending your high quality research papers in the future. We are also thinking about adding new sections of this journal to attract more readers. With the support of our community, I am confident that we can make this journal a more successful one. Here, I want to take this opportunity to thank the great leadership provided by the Editor-in-Chief since the foundation of this journal, Professor Nan-quan Lou, who has just become a senior advisory board member of this journal. I also want to thank the senior associate editor, Prof. Shu-qin Yu, who has made great contributions to the development of CJCP. Many thanks also go to the other senior associate editors, Profs. Die-yan Chen, Hai-lung Dai, Xing-xiao Ma, Han-qing Wang, Hou-wen Xin, Cun-hao Zhang and Qi-he Zhu, who have made important contributions to CJCP in the past 18 years. We plan that CJCP will soon become available online so that members of our community can access this journal easily through internet. This will also help us to provide greater visibility of this journal in the international research community. Xue-ming Yang Editor-in-Chief February 12, 2006     

主编的话

Happy New Year! Happy New Year again! This year is very special for CJCP since it is the 20th anniversary. We have seen a tremendousdevelopment in the field of chemical physics in China in the last 20 years. CJCP has always been there in this important period of development in Chinese science, and CJCP has made significant and important contributions to the development of the chemical physics research field in China. And we certainly will continue to do so in the future. In the beginning of last year, we changed the journal into a full English journal in an effort to enhance the journal impact in the international scientific community. In this transition period, CJCP has encountered many difficulties, and we have also made great progresses. We deeply believe that making CJCP a full English journal is an important step to increase its influence in the international research community. We hope this is the moment of a new start for the great tradition of CJCP to serve the Chinese chemical physics and physical chemistry community, and beyond. Now, our new web based editorial and review system is in place, we hope CJCP will serve our community in a more efficient and direct way (Website: http://cjcp.ustc.edu.cn). With the support of the chemical physics and physical chemistry community, I am confident that this journal will make more significant contributions to the development of the chemical physics researchfield. At this 20th anniversary of CJCP, I want to take this special opportunity to thank many people who have lead this journal through difficulties and triumphs in the most part of the last 20 years, especially the former Editor-in-Chief, Professor Nanquan Lou, and the former senior associate editor, Prof. Shuqin Yu. And I also want to thank the editorial staff members who have made great efforts in producing a high quality scientific journal. At last, I hope everybody who cares about the Chinese chemical physics development will support our effort to make this journal better. Xue-ming Yang Editor-in-Chief February 12, 2007     

GK可能C均值模糊聚类的白菜红外光谱分析

红外光谱分析是基于分子振动与跃迁理论的鉴别物质化学组成的技术.得到的光谱数据常常具有较高的维数和重叠度,这给后续的数据处理带来困难.为此提出一种GK可能C均值聚类算法(GKIPCM),引入了GK聚类算法的马氏距离测度与改进的可能C均值聚类算法(IPCM)的模糊隶属度与聚类中心更新方程,使样本的距离测度具有自适应性且避免...