反应式步进电机控制电路设计

使用ＳＤＫ８６单板机的８２５５Ａ接口、驱动电源外接档和光电开关，对步进电机的控制。实现电机启、停、变换和换向等功能，同时也实现系统中电扫描和机械扫描的同步。     

VMOS管全自动不间断逆变电源

本文介绍一种全自动不同断逆变电源，该电源的逆变电路简单、性能可靠，采用ＶＭＯＳ管作用功率输出级，逆变效率高，控制电路在市电接通时，对负载供电，同时对电瓶充电，充满自停，能实验市电和逆变电源供电的自动转换，设有电瓶充电过压和欠压保护电路，实现了全自动控制，可作为家庭小功率应急电源。     

φ16cm宽束离子源的设计

本文介绍了一种口径为φ１６ｃｍ的宽束离子源的设计．该源采用了多极场型放电室，结构紧凑合理，便于清洁维修以及更换离子引出系统．使用二栅引出系统时，可获得５０～１５００ｅＶ的离子束．距源１０ｃｍ处，５００ｅＶ的氩离子束的束流密度可达０．９５ｍＡ／ｃｍ２，且±８％均匀性的均匀区域达φ１４ｃｍ．     

禹城洼陷生烃潜力研究

目的 评价禹城洼陷的生烃潜力，以指导下一步勘探。方法利用烃源岩分析数据对禹城洼陷的生烃潜力进行研究和评价，利用包裹体测温等分析资料对影响烃源岩发育和分布的因素进行分析和总结，利用生物标志化合物指标（C29S／S＋R）对生油门限进行了重新认识和探讨。结果禹城洼陷烃源岩发育较差、分布不均，总体上处于未熟一低熟阶段；其主要影响因素是异常高压带的分布和火成岩的入侵；本区生油门限应在3500m以下。结论禹城洼陷下第三系生烃潜力不足。     

A Novel Digital Audio Watermarking Scheme in the Wavelet Domain

We present a novel quantization-based digital audio watermarking scheme in wavelet domain. By quantizing a host audio‘s wavelet coefficients (Integer Lifting Wavelet Transform ) and utilizing the characteristics of human auditory system ( HAS), the gray image is embedded using our watermarking method. Experimental results show that the proposed watermarking scheme is inaudible and robust against various signal processing such as noising adding, lossy compression, low pass filtering, re-sampling, and re-quantifying.     

High-quality hydrocarbon source rock in the Paleogene sequence of the Ping Chau Formation, Hong Kong

Although petroleum exploration is being conducted in the Hong Kong region, high-quality hydrocarbon source rocks have never been found in this area. The Ping Chau Formation is only Mesozoic-Cenozoic sedimentary rock exposed in Hong Kong and its surrounding areas. The hydrocarbon source rock of the Ping Chau Formation is very rich in organic matters, which has an average total organic carbon (TOC) of 1.9% and chloroform bitumen ““A““ range from 0.14% to 0.24%. The total hydrocarbon content varies from 880 to 1800 ppm and the transformation ratio is specific from 5 to 9. The index of pyrolytic hydrogen is up to about 600 mgHC/gTOC. These data demonstrate the characteristics of the high-quality hydrocarbon source rock. The lamalginite is the major maceral of the source rock of the Ping Chau Formation, and geochemical characteristics also suggest that the organic materials of the source rock are of type I and type Ⅱ1, with abundant gammacerane, γ, β-caro-tane and C24 tetracyclic terpane, which indicate that it was formed in the salt water and brackish water sedimentary environment, and the source rock has evolved into a mature phase. The organic inclusions are found within calcite veins in cracks of the source rock, indicating that hydrocarbon has been generated and a secondary migration has happened. The source rock in the Ping Chau Formation is about 200-300 m thick, thus having considerable hydrocarbon potential. The discovery of the high quality hydrocarbon source rock in the Ping Chau Formation will certainly provide insight on hydrocarbon resource exploration in the South China Sea area.     

应用层次分析法确定水生野生动物保护区主要污染源

本文使用层次分析方法来判定水生野生动物自然保护区内主要污染物和污染源,并且使二者由两次判断整合为一次判断,简化了保护区环境质量评价的过程。     

晋商的衰败

探究了晋商在经历了500多年辉煌的商业史后,在清末民初迅速走上衰败的社会根源和历史根源,及其深厚的人文因素、环境因素等等。     

东营凹陷纯西辉长岩-变质岩组合油藏成藏机制

目的探讨纯西辉长岩-变质岩油藏的形成演化过程。方法在查明纯西辉长岩活动时间及其高温、高压持续时间的基础上,结合纯西地区的构造发育史、周围洼陷的生烃史及油气分布规律,对其周围烃源岩的岩性、岩相及有机地球化学等进行了分析。结果建立了纯西辉长岩-变质岩组合油藏的成藏模式。结论辉长岩不仅大大促进了周围烃源岩的生烃、排烃过程,而且将其改造成为变质岩储层,并最终形成了特殊的辉长岩-变质岩组合油藏。     

春季太湖水域无机氮湿沉降来源初探

对2003年春季太湖站降雨资料进行分析,结果表明春季太湖水域NO3--N、NH4 -N的平均浓度分别为0.9和1.6mg/L。NO3--N与降雨量的相关系数是NH4 -N的两倍。利用气团后向轨迹分类法以及天气形势得到春季影响太湖流域的主要是海洋性降水,春季海洋性降水中NO3--N、NH4 -N沉降通量分别为1.01 kg/hm2、1.95kg/hm2,而大陆性降水中NO3--N、NH4 -N沉降通量分别为0.13和0.26 kg/hm2。同时利用气团后向轨迹,在海洋性过程中对云下气团进行分类,结论是北方气团对太湖水域氮的输送及沉降负荷最大,NO3--N、NH4 -N的沉降量分别占总沉降量的53.5%和57.9%,西南气团次之,NO3--N、NH4 -N的沉降量分别占总沉降量的34.6%、32.8%,局地气团最小,NO3--N和NH4 -N的沉降量分别只占总沉降量的11.9%、9.3%。