用消去法推求原子谱项

提出了确定复杂组态的Ｓｌａｔｅｒ函数和原子谱项的程序化方法。运用Ｐａｓｃａｌ语言编制了计算程序，利用本程序可准确地导出等效组态ｓ＾Ｎ，ｐ＾Ｎ，ｄ＾Ｎ，ｆ＾Ｎ，ｇ＾Ｎ，ｈ＾Ｎ，ｉ＾Ｎ，ｋ＾Ｎ，ｌ＾Ｎ，ｍ＾Ｎ，ｎ＾Ｎ，ｏ＾Ｎ，ｑ＾Ｎ，ｒ＾Ｎ，ｔ＾Ｎ，ｕ＾Ｎ，ｖ＾Ｎ，ｗ＾Ｎ，ｘ＾Ｎ，ｙ＾Ｎ，ｚ＾Ｎ的Ｌ－Ｓ耦合谱项和Ｓｌａｔｅｒ函数。迄今为止，还未见国内外文献报道过。     

快速推求等效组态的原子谱项

本文根据置换群方法，运用Ｃ语言编制了计算程序，可快速、准确地推求等效组态ｓ＾Ｎ、ｐ＾Ｎ、ｄ＾Ｎ、ｆ＾Ｎ、…ｘ＾Ｎ、ｙ＾Ｎ、ｚ＾Ｎ的原子谱项。     

混煤氮的热解析出特性及燃料NO_x的形成规律

混煤氮的热解析出特性及燃料ＮＯ_ｘ的形成规律邱建荣，马毓义，曾汉才，吕焕尧，喻秋梅（华中理工大学煤燃烧国家重点实验室武汉４３００７４）关键词：混煤，ＮＯ_ｘ，混合比，燃烧。ＥＭＩＳＳＩＯＮＯＦＮＩＴＲＯＧＥＮＣＯＭＰＯＵＮＤＳＡＮＤＮＯ_ｘＦＯＲＭＡＴ?..     

四维NMR谱

尽管３ＤＮＭＲ谱的分辨率有所提高，但解释较大的三维异核ＮＭＲ谱时，仍存在含糊性。因此，人们希望通过增加维数进一步提高分辨率，在最近几年中出现了４ＤＮＭＲ谱，４ＤＮＭＲ谱常常是说明２ＤＮＭＲ谱的方法，４ＤＮＭＲ实验可简单地看作是由三个２ＤＮＭＲ实验所组成，新的４ＤＮＭＲ技术仍在不断地发展，已有许多将４ＤＮＭＲ谱应用于蛋白质及核酸研究的报道。     

TOTAL CROSS SECTION MEASUREMENTS FORELECTRONSCATTERINGONMETHANEBETWEEN1AND50eV

ＴＯＴＡＬＣＲＯＳＳＳＥＣＴＩＯＮＭＥＡＳＵＲＥＭＥＮＴＳＦＯＲＥＬＥＣＴＲＯＮＳＣＡＴＴＥＲＩＮＧＯＮＭＥＴＨＡＮＥＢＥＴＷＥＥＮ１ＡＮＤ５０ｅＶＬｉＴａｉｈｕａＹｅＲｕｉｙｉｎｇＹａｎｇＹｏｎｇＣｅｎｔｅｒｆｏｒＲａｄｉａｔｉｏｎＰｈｙｓｉｃｓ...     

会议消息

会议消息ＦＩＦＴＨＩＮＴＥＲＮＡＴＩＯＮＡＬＣＯＮＧＲＥＳＳＯＮＳＯＵＮＤＡＮＤＶＩＢＲＡＴＩＯＮ￥ＵｎｉｖｅｒｓｉｔｙｏｆＡｄｅｌａｉｄｅ，ＳｏｕｔｈＡｕｓｔｒａｌｉａＤｅｃ．１５～１８３１９９７第五届国际声和振动会议将于１９９７年１２月１５～１８...     

氮氧化合物在铜,银,镍,钯,铂面的吸附,脱附理论研究

采用ＡＳＥＤ－ＭＯ量子化学方法对氮（Ｎ２）和氮氧化合物（ＮＯｘ）在Ｃｕ,Ａｇ,Ｎｉ,Ｐｄ,Ｐｔ５种金属（１１１）面上的吸附态进行了系列研究,计算结果表明：在汽车尾气净化的催化处理过程中,当用铜,银,镍,钯,铂等金属作催化剂将ＮＯｘ转化为Ｎ２时,以金属Ｐｔ为最好。用铂作催化剂将ＮＯ还原成Ｎ２时,可得如下反应机理：ＮＯ分子首先吸附在Ｐｔ表面,然后吸附分子ＮＯ的Ｎ－Ｏ键中Ｏ原子。     

三维NMR谱

３ＤＮＭＲ谱是２ＤＮＭＲ谱附加一个时间周期扩展而成，３ＤＮＭＲ共振峰的重叠降低，并且灵敏度与常规的２ＤＮＯＥＳＹ实验大体相当，采集３ＤＮＭＲ数据组所需时间太长，因此迄今为止，该方法的实际应用只局限于那些浓度相当高的样品。尽管目前还十分费时，但很可能３ＤＮＭＲ不久即可成为常规的ＮＭＲ技术。     

a—C：H（N）薄膜结构的X射互光电子能谱分析

采用直流－射频等离子增强化学汽相沉积技术制备ａ（Ｃ：Ｈ（Ｎ）薄膜，用Ｘ射互光电子能谱研究了混合气体中Ｎ２含量对薄膜成分与结构的影响，ａ－Ｃ：Ｈ（Ｎ）薄膜中含氮量可达９．０９％，对ａ－Ｃ：Ｈ（Ｎ）薄膜的Ｎｌｓ结合能谱的分析表明ａ－Ｃ：Ｈ（Ｎ）薄膜的结构是由Ｃ３Ｎ４相镶嵌在ｓｐ＾２键结合的Ｃｘ基体组成，其中Ｃ３Ｎ４相中Ｎ和Ｃ原子比接近４：３，不随薄膜中含Ｎ量改变，薄膜中Ｃ３Ｎ４相和ｓｐ＾３碳伯含量随Ｎ     

推求等效组态的原子谱项波函数

本文提出了推求复杂组态Ｌ－Ｓ耦合谱项波函数的系统方法，着重解决了推求多重谱项的谱项波函数这一难题，运用ＰＡＳＣＡＬ语言编制了计算程序，利用本程序可快速、准确地求出等效组态的ｓ＾Ｎ，ｐ＾Ｎ，ｄ＾Ｎ，ｇ＾Ｎ，ｉ＾Ｎ，ｋ＾Ｎ的Ｌ－Ｓ耦合谱项和谱项波函数     

Time domain finite volume method for the transient response and natural characteristics of structural-acoustic coupling in an enclosed cavity

A time domain finite volume method（TDFVM）based on wave theory is developed to analyze the transient response and natural characteristics of structural-acoustic coupling problems in an enclosed cavity.In the present method,the elastic dynamic equations and acoustic equation in heterogeneous medium are solved in solid domains and fluid domains respectively.The structural-acoustic coupling is implemented according to the continuity condition of the particle velocity along the normal direction and the normal traction equilibrium condition on the interface.Several numerical examples are presented to validate the effectiveness and accuracy of the present TDFVM.Then the effects of water depth on the acoustic and vibration characteristics and the natural characteristics of a structural-acoustic coupling system are analyzed.The numerical results show that the increase of water depth leads to a stronger coupling between the water and structure and the decrease of natural frequencies of coupling system,The computational cost and memory of this method are small and it can be applicable to structural-acoustic coupling problems in the heterogeneous fluid.     

Modeling Gain Dynamics in EDFAs: Space-Resolved Versus Lumped Models

We present a detailed comparison of dynamic space- and frequency-resolved and lumped erbium-doped fiber amplifier (EDFA) models. The space- and frequency-resolved models are based on an iterative solution of propagation equations for pump, multiple signals, and spectral components of forward and backward propagating amplified spontaneous powers and rate equations for pump, metastable, and ground energy level population densities of erbium ion. In contrast to space-resolved models, the lumped model solves a single ordinary differential equation for time evolution of the length-averaged metastable level population and is therefore substantially less computer time consuming. Both the space, and frequency-resolved and the lumped models give almost identical results when used for an analysis of surviving channel power excursions in concatenated EDFAs fed by multiwavelength signal and add/drop scenarios. For a statistical analysis of output power and signal-tonoise ratio fluctuations in EDFA cascades fed by burst-mode packet traffic, only lumped models can be used.     

镧和铕与邻菲罗啉谷氨酸配合物的NMR和IR研究

合成了稀土镧和铕与谷氨酸，邻菲罗啉形成的二元及三元配合物，经元素分析确定该配合物的组成为Ｌｎ（ｐｈｅｎ）（Ｇｌｕ）３．７Ｈ２Ｏ（Ｌｎ＝Ｌａ，Ｅｕ）；Ｅｕ（Ｇｌｕ）３；１２Ｈ２Ｏ。用核磁共振和红外光谱研究与配体与稀土离子的配位方式，讨论了稀土离子的顺磁性及屏蔽效应对配合物的ＮＭＲ谱图的影响。     

利用ICP-AES分析大豆体内Mn和Zn分配及收支平衡

长期定位试验和ICP-AES测试相结合,研究了下辽河平原土壤有效Mn和Zn浓度变化以及不同施肥制度下大豆体内Mn和Zn浓度与含量的变化。结果表明：下辽河平原土壤有效Zn浓度已濒临临界值,应加强对其监测;大豆籽实和秸秆体内Zn浓度受施肥影响变化较小;而籽实中Mn浓度受施肥影响变化较大,且NPK和NPKO处理显著高于O和CK处理;养分循环再利用在增加大豆生物量的同时,Mn和Zn携出亦呈增加趋势;土壤-作物系统中,Mn和Zn均出现收支赤字,其赤字大小顺序为NPKO＜O＜CK＜NPK,表明养分循环可以显著减缓这种赤字,使生态系统更可持续。     

Comparison between formulas of rotational band for axially symmetric deformed nuclei

The experimental rotational spectra of the deformed nuclei available in even-even and odd-A nuclei in the rare-earth and actinide regions are systematically analyzed with several rotational spectra formulas,including Bohr-Mottelson's I(I+l)-expansion,Harris'w2-expansion,ab and abc formulas.It is shown that the simple 2-parameter ab formula is much better than the widely used 2-parameter Bohr-Mottelson's AB formula and Harris'αβ formula.The available data of the rotational spectra of both ground-state band in even-even nuclei and one-quaasiparticle band in odd-A nuclei can be conveniently and rather accurately reproduced by ab formula and abc formula.The moment of inertia and the variation with rotational frequency of angular momentum can be satisfactorily reproduced by ab and abc formulas.     

Temperature Sensitivity Control and Mechanical Stress Effect of Boron-Doped Long-Period Fiber Gratings

We will present in this work the quantitative analysis of the relationship between the doping concentrations of GeO 2 and B 2 O 3 in the core and cladding regions and the temperature sensitivity of the resonance wavelength shift in long-period fiber gratings (LPFGs). Based on this analysis, the temperature sensitivity was suppressed and enhanced to 0.002 nm/°C and 0.28 nm/°C, respectively. We will also discuss the effect of the residual mechanical stress on the optical and mechanical properties of LPFGs. In particular, we will present the measurement results of the dependence of the refractive index change and mechanical strength on the residual mechanical stress in the boron-doped fibers with depressed clad and matched clad.     

Synthesis of Pd and Rh metal nanoparticles in the interlayer space of organically modified montmorillonite

This study reports the synthesis of palladium and rhodium metal nanoparticles supported on montmorillonite (MMT) and partially organically modified MMT (POMM) using tetraamine palladium and hexaamine rhodium complex as precursor for palladium and rhodium respectively. The synthesized nanoparticles were characterized by powder X-ray diffraction PXRD and TEM. The PXRD study shows characteristic crystallographic planes for Pd and Rh metal and confirm the formation of metal nanoparticles in MMT and POMM. The TEM images reveal the effect of organic modification of MMT on decreasing particle size of Pd and Rh metal. The Pd and Rh metal nanoparticles are agglomerated in pristine MMT while nanoparticles are well dispersed in POMM. ICP-AES analysis was carried out to estimate quantitative amount of Pd and Rh metal in MMT and POMM.     

Astrophysical combustion

There are three main astrophysical combustion systems: the evolution of stars, formation of interstellar dust and particulates, and the transition to hadrons in the early universe. These are described in terms of general combustion concepts, such as ignition, laminar and turbulent flames, detonations, multiphase flows, and particle and soot formation. Viewed in this way, the universe and many of its most important astronomical components are combustion systems, and we should use these as naturally occurring laboratories for exploring new and familiar combustion regimes. A more detailed discussion focuses on one type of combustion system, the ignition and development of turbulent flames in Type Ia supernovae, and the importance of the transition to a detonation.     

Music,empathy and cultural understanding

In the age of the Internet and with the dramatic proliferation of mobile listening technologies, music has unprecedented global distribution and embeddedness in people's lives. It is a source of intense experiences of both the most intimate and solitary, and public and collective, kinds – from an individual with their smartphone and headphones, to large-scale live events and global simulcasts; and it increasingly brings together a huge range of cultures and histories, through developments in world music, sampling, the re-issue of historical recordings, and the explosion of informal and home music-making that circulates via YouTube. For many people, involvement with music can be among the most powerful and potentially transforming experiences in their lives. At the same time, there has been increasing interest in music's communicative and affective capacities, and its potential to act as an agent of social bonding and affiliation. This review critically discusses a considerable body of research and scholarship, across disciplines ranging from the neuroscience and psychology of music to cultural musicology and the sociology and anthropology of music, that provides evidence for music's capacity to promote empathy and social/cultural understanding through powerful affective, cognitive and social factors; and explores ways in which to connect and make sense of this disparate evidence (and counter-evidence). It reports the outcome of an empirical study that tests one aspect of those claims, demonstrating that ‘passive’ listening to the music of an unfamiliar culture can significantly change the cultural attitudes of listeners with high dispositional empathy; presents a model that brings together the primary components of the music and empathy research into a single framework; and considers both some of the applications, and some of the shortcomings and problems, of understanding music from the perspective of empathy.     

Design and simulation of the wire scanner for the injector linac of BEPC Ⅱ

BEPC Ⅱ,the upgrade project of Beijing Electron Positron Collider (BEPC),is an accelerator with large beam current and high luminosity,so an efficient and stable injector is required.Several beam diagnostic and monitoring instruments are used.A new diagnostic instrument--wire scanner,has been designed and will be used to nleasure the profile of the linac beam of BEPC Ⅱ.This paper describes the prototype of this system and the cause of heat generating of the wire.Some simulation results of the heat and force by using finite element method software-ANSYS(R),2) are presented and discussed.