19GeV/c能量下质子-铍碰撞中领头奇异超子Λ的产生

利用在美国布鲁克海汶国家实验室的环型加速器(Brookhaven/AGS)上进行的19.6 GeV质子轰击固定铍核的实验数据,通过质子与π介子对的搭配,并用一种新的循环迭代的混合事件方法,从复杂的背景中,提炼出共振态领头粒子Λ的产生.     

花(鱼骨)胚胎发育及卵黄囊仔鱼形态的初步观察

运用多种处理方法对花的胚胎发育进行连续观察,并对其卵黄囊仔鱼形态变化进行初步观察与测量。观察结果显示:(1)花胚胎发育可以划分为22个明显的时期,包括7个主要的发育阶段;(2)在(20±1)℃条件下,仔鱼在出膜后的第3天开口摄食,卵黄囊在第7天基本消失,此阶段仔鱼的全长平均日增长率为4．67％,而以第4天增长最快。该实验结果将为花的人工繁殖及苗种培育,特别是为仔鱼在营养转换阶段的培育提供了理论参考。     

锰酸锂正极锂离子二次电池纯电动汽车的研制

以100Ah的锰酸锂锂离子二次电池锂离子电池组和30kW交流电机组成了动力系统,研制了MGL6486EV电动汽车。电池组的电压为304V,能量为37kWh,电池组采用了智能管理系统(BMS)和均衡系统。电动机采用全数字适量控制,并具有刹车能量回收和防溜车功能。在充电时智能充电机始终与BMS保持通信联系,以保证电池组安全快速充电。车辆最高车速可达117km/h,0~50km/h加速时间为6·80s,50~80km/h加速时间为7·34s,爬坡度超过20%,续驶里程为204km,百公里耗电仅为19kWh。到目前为止该车辆已运行5万多km。     

Lithostratigraphy and faunal aspects of marine Jurassic rocks in Thailand

Thai marine Jurassic rocks are well exposed in the Mae Sot, Umphang, and Phop Phra areas, less extensively near Mae Hong Son, Kanchanaburi, Chumphon, Nakhon Si Thammarat and Krabi. Generally they rest unconformably on Permian and Triassic, and are overlain by Quaternary strata. Fourteen lithostratigraphic units are defined (in ascending order): Pa Lan, Mai Hung, Kong Mu formations of the Huai Pong Group-Mae Hong Son area; Khun Huai, Doi Yot, Pha De formations of the Hua Fai Group-Mae Sot area; Klo Tho, Ta Sue Kho, Pu Khloe Khi, Lu Kloc Tu formations of the Umphang Group-Umphang area; and Khlong Min Formation-Chumphon, Nakhon Si Thammarat, and Krabi areas. Dominant widespread mudstones, siltstones and sandstones; limestones are confined to the Mae Sot, Phob Phra, Umphang, Kanchanaburi and Mae Hong Son areas; marls are found only in Mae Sot. Sequences are approximately 900 m thick (Mae Sot), 450 m thick (Umphang) and thinner elsewhere, especially the south. Based on ammonites, brackish to marine bivalves, and foraminifera, the beds are dated mainly as ToarcianEarly Bajocian.     

Depositional environments of Bathonian sediments from the Jaisalmer Basin, Rajasthan, western India

The pericratonic sedimentary Jaisalmer Basin, west of the Aravalli Ranges, on the westerly dipping eastern flank of the Indus Shelf, is a principal structural element of Rajasthan. Jurassic sediments in the SE comprise non-marine sandstones and conglomerates to nearshore, brackish to marine sands, silts, clays and carbonates, grouped lithostratigraphically into the Lathi, Jaisalmer, Baisakhi, and Bhadasar formations. The Late Bajocian to Oxfordian Jaisalmer Formation is divided, in ascending order, into the Hamira, Joyan, Fort, Badabag, Kuldhar, and Jajiya members. Fossil records providing a Bajocian to Bathonian age for the lower and middle parts of the formation include: a Late Bajocian coral Isastraea bernardiana (d’Orbigny) in the uppermost Joyan Member; Bathonian ammonite Clydoniceras in the basal part of the Badabag Member; Bathonian foraminiferal/bivalve assemblages in the Fort Member. The topmost bed of the Joyan Member represents the peak of first marine transgression of the Jaisalmer Basin, probably contemporaneous with the Late Bajocian one in the neighbouring Kachchh Basin. Based on faunal studies Bajocian to Bathonian sediments of the Jaisalmer Basin can be broadly correlated with those of the Kachchh Basin. The Fort and Badabag members represent the following depositional environments, in chronological order: (a) brackish to shallow fully marine; (b) fully marine with rapidly fluctuating water energy and sedimentation rates; (c) near-shore to lower shoreface with fluctuating energy conditions, salinity and sedimentation rates; (d) near-shore to shoreface channels and storm-dominated marine above fair-weather wave-base; (e) lagoon with fluctuating low to moderate energy, salinity and sedimentation rates; (f) stormdominated shelf to lower shoreface.     

受污染水源水的生物处理工艺试验研究

通过预曝气增加进水DO含量，改进了生物处理装置的实际运行效果。试验采用常用的陶粒滤池工艺，安装两套相同的反应器，一套反应器采用传统的曝气方法供氧，原水直接进入反应器，另一套反应器的原水先进行纯氧预曝气，使之DO达到超饱和状态，反应器内不再进行曝气。试验结果表明，原水预先充氧达到超饱和状态后进行生物处理，原水中的DO可以满足微生物的需求，各项污染物的去除效果优于采用传统曝气方法供氧的生物处理装置。试验结果表明，开发适用于饮用水生物处理的无泡供氧装置具有现实意义。     

水波与淤泥质底床相互作用数值模拟——基于滞后回路特征的淤泥体流变模型

应用一个滞后回路特征的半经验的淤泥体流变模型描述表面水波作用下底床软泥层的振荡运动，建立了表面水波与淤泥质底床相互作用的垂向二维耦合模型。在数值处理上，为提高数值格式对水－泥界面附近流动的分辨力，较好地再现界面附近速度梯度大的流动特点，采用垂向对数网格处理技巧。模型验证是通过计算水波波高衰减率和底床软泥体输移速度，并与有关的实验测量数据进行比较。     

大型重载支承轴的疲劳裂纹时间序列诊断分析

大型重载支承轴隐蔽部位由于发生不可观测的突发性疲劳断裂，严重影响正常生产，给企业带来重大经济损失；分析这类支承轴的结构特点与振动信号特征之间的关系，运用时序分析方法对振动信号进行建模，并采用残差σ２a和归一化残差平方和NRSS作为识别疲劳裂纹状态的特征指标，有效诊断出了支承轴的疲劳裂纹程度。实验结果表明，采用σ２a和NRSS作为特征指标的时序分析方法对大型重载支承轴隐蔽部位的疲劳裂纹状态进行诊断，比常规的时频幅值特征分析法更为敏感有效、简便易行，且具备很强的实用性。     

软硬件协同设计和系统级仿真探索

简要介绍了系统级芯片设计的软硬件协同设计、协同仿真技术和SoC开发中系统级协同仿真的工具，并给出了一个在CCSS (CoCentric system studio)环境下完成软硬件协同仿真的实例。     

聚能效应在岩石定向断裂控制爆破中的研究

针对目前石材开采面临的问题，对采用聚能药包岩石定向断裂控制爆破技术时的裂缝(纹)起裂和扩展的机理进行了探讨，同时对该法的爆破参数进行了设计；实验室和现场试验验证结果表明，由聚能射流形成的切缝有明显的定向作用，使爆生气体的能量沿预定方向集中，裂纹的定向断裂控制效果良好，表明该法是一种比较理想的断裂控制爆破技术；研究成果对相关理论研究和现场应用均有一定的指导意义，该法将会成为岩石定向断裂控制爆破发展的一个方向。