视网膜振荡电位异常改变的临床分析

目的 对多种眼科疾病进行视网膜振荡电位(Ops)的检测及分析，探讨了视网膜振荡电位在眼科多种疾病的诊断及评估方面的临床意义。方法对261例412只眼进行Ops检测，对Ops的检测结果进行分析。结果发现糖尿病及糖尿病性视网膜病变、视网膜中央及分支静脉阻塞、高度近视及高度近视性视网膜病变、视网膜色素变性等均有不同程度的Ops总幅值改变。同时发现，老年性黄斑变性、老年性白内障、弱视、中心性浆液性视网膜脉络膜病变及轻、中度近视者，则Ops总幅值无明显改变。结论视网膜Ops的检测是临床眼科诊断及评估的有力手段。     

氧氟沙星荧光光度法测定痕量铁

研究了在HAc-NaAc缓冲溶液中氧氟沙星与Fe(Ⅲ)的络合反应，结果表明：在pH=4．0的缓冲溶液中，氧氟沙星有稳定而较强的荧光；与Fe(Ⅲ)络合后，荧光强度减弱．最大激发及发射波长为324nm和498．6nm，Fe(Ⅲ)的质量浓度在0．56～3．08mg／L范围内，荧光强度与浓度呈良好的线性关系．检出限为0，076mg／L，常见的共存离子不干扰其测定．本方法用于水中痕量铁的测定，得到了满意的结果。     

利用GMS—5红外资料进行云的分类识别

利用GMS－5 3个红外通道（2个分裂窗区通道和1个水汽通道）的亮温资料，依据各种云不同的辐射特征对其进行分类，由此识别出积雨云（Cb）、浓积云（Cg）、卷云（Ci）、积云（Cu）、中云（Cm）、密云（Dense）等6种主要云类以及雾（Fog）和晴空区域。结合安徽寿县地面观测基准站1998年6、7月份的地面观测资料，对分类结果进行了检验，得到了较为令人满意的结果，准确率接近70％。     

Investigation on the Cause of Excessive Vibration of an Offshore Platform

0　IntroductionWiththeexploitureanddrillingforoceanre source,offshore platformsaremost prolificandprevalentintheoffshoreindustrytoday .Asthefun damentalinstallationsofdevelopmentofoceanre sources ,designingrequirementsofoffshoreplatformsarebecomingmoreandmoreimportant.Underenvironmentalloadsduetowind ,cur rent ,waveandevenseismicprotectionattack ,off shoreplatformsinevitablyvibrateduringtheirlife time .While ,foranormalconditionthisvibrationissmallandtheoccupantsontheplatformdon tsenseitatall.…     

《广西民族学院学报(哲社版)》引文分析

运用文献计量学方法 ,对 1 995～ 2 0 0 2年度《广西民族学院学报 (哲社版 )》全部论文的引文量、引文类型、引文语种、引文年代等进行统计分析 ,揭示该刊论文著者利用科技文献的规律。     

聚合物材料断面形貌特征定量分析

总结归纳了聚合物材料断面形貌特征定量分析研究取得的一些成果和断面粗糙度的表征参数、测试方法及其分类,指出:随加载速率增大、试验温度降低,聚合物材料断面镜面区、肋状形态应力白化区等耗散能量的特征区域尺寸降低;聚合物材料的断裂能耗表征参量与其断面的镜面区、肋状形态、应力白化区和断面粗糙度有关,脆性断裂时,材料断裂能耗的变化取决于断面粗糙度表征参量(RS、DF)的变化,断裂能耗参量与断面粗糙度表征参量呈线性正相关关系,韧性断裂时,断裂能耗参量与断面粗糙度表征参量偏离线性关系,其具体的关系与材料的断裂机制有关。聚合物材料断面定量分析必须与其变形、断裂的微观机制相结合,才能得出有价值的结果。     

Impact of the closure of Indonesian seaway on climate: A numerical modeling study

Using a global OGCM and its relevant coupled ocean-atmosphere GCM with the contemporary, 6 MaBP and 14 MaBP oceanic topography, respectively, a series of numerical experiments are implemented in order to investigate the effect of the north shift of Australian continent on the tropical oceanic circulation, especially the formation of the western Pacific warm pool. The numerical experiments of the individual OGCM forced by the modern atmospheric circulation indicate that the closure of Indonesian passage results in warming in the tropical Pacific Ocean and cooling in the tropical Indian Ocean; furthermore, it also results in change in source of the Indonesian Through Flow (ITF) water, e.g. ITF mainly originates from the south Pacific at 14 MaBP, but it mainly originates from the north Pacific now. The coupled model shows similar results as the individual OGCM qualitatively.     

以[NEt4]3[Fe(CN)6]和[Mn(Ⅲ)(SB)S1S2]ClO4为单元的分子磁体的合成和表征

以[NEt4]3[Fe(CN)6]和[Mn(Ⅲ)(SB)S1S2]ClO4(SB,席夫碱＝5-CH3salophen (双水杨醛缩邻苯二胺)和5-CH3salen (双水杨醛缩乙二胺),S1和S2为H2O或CH3OH)为单元,室温下组装得到了新的化合物,并进行了相应的表征.结合元素分析、红外光谱分析、紫外-可见光谱分析和热分析结果,可以看出,席夫碱配体的空间位阻不同,化合物的结构也有很大变化.     

A preliminary study of crassulacean acid metabolism (CAM) in the endangered aquatic quillwortIsoetes sinensis Palmer in China

Isoetes sinensis Palmer (Isoetaceae) is an aquatic or amphibious plant that is critically endangered in China. Previous studies have revealed the crassulacean acid metabolism (CAM)-like photosynthetic pathway occurs commonly in submerged leaves in genusIsoetes. Water chemistry parameters and the titratable acidity content of the plant extract were measured from samples obtained in the early morning (7∶00) and late afternoon (15∶00) from twoI. sinensis populations in China. One population occurs in the eulittoral zone of a freshwater tidal river at low elevation (134 m) and another occurs in a densely vegetated, high elevation (1 100 m) alpine shallow pool. Significant differences in pH and titratable acidity of the plant extract were detected between the morning and afternoon samples. These changes are associated with diurnal changes in water chemistry. Our results provide the first evidence for the existence of the CAM pathway in the East Asian endemicIsoetes sinensis Palmer. The magnitude of fluctuations in the titratable acidity of the plant extract may be correlated with the severe carbon limitation imposed on the plants by its aquatic habitat. Foundation item: Supported by the State Key Basic Research and Development Plan (G2000046805) Biography:Pang Xin-an (1974-), male, Master candidate, research direction: conservation biology.     

Do multiple cycles of aeolian deposit-pedogenesis exist in the reticulate red clay sections in southern China?

Since the Quaternary scientists successfully dis-closed the paleoclimatic significance of the loess-paleo- sol sequence in the Loess Plateau, Northwest China, the loess-paleosol sequence has become well-known terres-trial materials revealing the multiple cyclic changes of Quaternary climates. As a carrier of paleoenvironmental information, it could compare beauty with the deep ocean deposit[8]. In recent years, however, the researchers began to put their sights to southern China. They try t…