FEATURES OF POINT BAR DEPOSITION IN THE JUMA RIVER, RONG CHENG, HEBEI PROVINCE, NORTHCHINA

A section is described through the point bar sediments of a meander bend on the Juma River, Rong Cheng. The point bar is characterised by lateral depositional units separated by inclined erosion surfaces. Each unit displays an upward sequence of grain- size fining and reduced trough cross-bedding scale. These units, formed by flood flows, reflect the lateralmigration of the bend and the flood regime of this semi-arid environment . The prevalence of chute deposits in the upper element of the lateral depositional units reflects the rate of outer bank erosion and bend migration, which in turn depend on bank strength and river gradient. The sedimentology of this point bar illustrates the potentiail complexity of the process of point bar construction.     

Prehistoric disasters at Lajia Site, Qinghai, China

Lajia Site, located near the upper reaches of the Yellow River and the border of Qinghai Province and Gansu Province, is a large-scale site of the Qijia Culture. In 2000 and 2001, archaeologists excavated an unusual scene of prehistoric dramatic and miserable disasters. Lots of geo-logic-geographic evidences revealed that the Lajia Site was ruined by coinstantaneous disasters, mainly floods from the Yellow River and earthquakes, accompanying mountainous torrents. Study on these disasters and their driven forces could provide us not only the knowledge on the palaeoenvi-ronment of the area, but also offer us a valuable site to assess the influence of the natural disasters on human civilization development.     

Advances in Tube Hydroforming - An Enabling Technology for Low-Mass Vehicle Manufacturing-Material, Lubrication, Loading, Simulation Issues, and Alternatives

The tube hydroforming process (THF) has recently found a wide application opportunity in the automotive industry, and is of increasing interest to other industries as well. The increased interest stems from the fact that, through the THF process, manufacturers are able to produce complex, consolidated,lightweight parts with reduced number of post-processing than through alternative metal forming techniques.In order to fully realize the benefits of this technology, various aspects have been under investigation in academia and industry world-wide. In this paper, effect of loading path, incoming material variation, and lubrication on the robustness of the hydroforming process and final part specifications are summarized based on previous experimental and computational work. In addition, the simulation of hydroforming and examples are presented in comparison with experimental findings. Briefly, results emphasized the importance of the loading path design whereas material variation within the experimentally tested range was not found to be significantly effective on the final part specifications. Selection of a lubricant for hydroforming of a frame rail part was presented demonstrating several aspects of lubrication selection methodology. Results of friction experiments show that only thickness, axial feeding, and force measurements are good indications of lubricant performance as these are found to be strongly discriminative.     

Director of Editorial Development, ISI, Visits Tsinghua University

Dr. James Testa, Director of Editorial Development of ISI (Institute for Scientific Information), visited Tsinghua on October 17, 2005. Tsinghua Vice President Kang Kejun had a talk with Dr. Testa. On behalf of the university, Vice President Kang welcomed Testa to Tsinghua, noting that as a world-famous institute, ISI has contributed a lot to scientific research. Vice President Kang emphasized the importance of international exchange of research and gave an outline of Tsinghua’s r…     

打造信息城市,构建美好兰州

信息化是当前世界发展的主题之一,信息城市是21世纪城市的发展方向。本文结合信息化发展现状,分析和探讨了21世纪构建城市的体系架构及发展构想。     

From Polymeric Nanoparticles to Dye-containing Photonic Crystals:Synthesis,Self-assembling,Optical Features, Possible Applications

1 Results Self-assembling of monodisperse polymeric nanoparticles is a perspective method of obtaining photonic crystalline materials for optoelectronics,telecommunication industry and optosensorics.For tuning optical characteristics of photonic crystals it is advisable to functionalize nanoparticles by dyes absorbing or emitting light in the vicinity of the photonic band gap,which position depends on the nanoparticle diameter.To prepare monodisperse nanoparticles with the dye-functionalyzed surface emulsion copolymerization of styrene with functional comonomers methacrylic acid[1] or N-vinylformamide was investigated.Dyes were attached onto the surface of nanoparticles either by covalent binding with surface amino groups of poly(styrene-co-N-vinylformamide-co-4-aminostyrene) particles[2] or by the ionic interaction of cationic dyes (Rhodamine 6G,Acriflavine,and 1-(3-ammonium-propyl)-4-[(E)-2-(3,4-dimethoxyphenyl)-1-ethenyl]pyridinium perchlorate) with surface carboxylic groups of poly(styrene-co-methacrylic acid) particles.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs. The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with atotal thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ^58O values of dolomited burrow infills (-5.9‰～-7.8‰,PDB) and matrix dolomites (-6. 6‰～-8. 1‰, avg. -7. 4‰PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its ^87Sr/Sr^86 ratios (0. 7084～0. 7088) that are higher than suggested for the late Ordovician seawaters (0. 7078～0. 7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to “cannibalization“ of earlier replacement dolomite during the chemical compaction.     

Zircon SHRIMP U-Pb geochronology and petrogenesis of the plagiogranites from the Lagkor Lake ophiolite, Gerze, Tibet, China

Field relationship, along with petrographical, petrological, and geochemical characteristics, and zircon populations, indicates that the plagiogranites from the Lagkor Lake ophiolite in the Bangong-Nujiang suture zone (~ 20 km south of Gerze County, central Tibet, China), derived from anatexis of hydrated gabbros by ductile shearing during transport of the oceanic crust. Therefore, this kind of plagiogranite is coeval to or little later than the spreading of the oceanic crust. Zircon SHRIMP age of 166 ± 2.5 Ma for the plagiogranites indicates that an oceanic basin existed in the western part of the Bangong-Nujiang zone in the Middle Jurassic.     

Eocrinoid echinoderms from the Lower Cambrian Guanshan Fauna in Wuding, Yunnan, China

This is a brief report of a new occurrence of eocrinoids from the Early Cambrian Wulongqing Formation in Yunnan, China. The eocrinoids from the Guanshan fauna are among the earliest known eocrinoids. Different from many other Early and Middle Cambrian eocrinoids, the Guanshan eocrinoids are char-acterized by the absence of sutural pores and epispires, the long and spiral brachioles, the extremely long stalk, and the ratio of the length of the stalk versus that of the calyx. The discovery of the eocri-noids from the Guanshan fauna not only provides new information to the investigation of the early evolution of this animal group, but also shed new light on the occurrence and migration of early eocrinoids.     

兰州,临洮,武山及其附近鸟类的研究

研究結果表明:在兰州、临洮、武山及其附近棲息着193种鳥类,分隶于19目、43科,其中24种为甘肃省新紀录。区系成份上古北界的占41.8％,东洋界的占13.2％,其余40％为上述两界的兼有种。收集了177种鳥类食性分析资料,統計結果为:食虫鳥占53.1％,食脊椎动物的占16％——其中約三分之一主食齿类,食谷物的占30.9％——其中五分之一食昆虫且全部覓食杂草种籽,故本区鳥类有一定的經济意义。指出:雨燕目、鵑形目、鴷形目以及雀形目中的燕科、鸫亚科、鶯科、山雀科等鳥类为本区食虫鳥的优势种,应予保护。建議对石鸡、雉及兰馬鸡应划定禁猎区以豐富动物資源。累积了21項鸟类繁殖的资料,說明鳥类的筑巢方式、用材各有其特点且带有遺傳性质。报导了50种鸟类迁移的資料,可供掌握本区鳥类活动規律的参考。最后认为:人的經济活动对鳥类影响很大,举兰州小西湖、雁滩中滩河自然景观变动前后鳥类组成变化說明;鳥类对巢区有依恋性。了解这一現象有很重要的理論及实踐意义,据此,可創造一定条件招引益鳥。     

黄河兰州段原生动物调查

１９９０～１９９３年４～６月、９～１０月间，调查了黄河兰州段的原生动物，从６个样点中共发现１６１种，隶属于肉鞭虫门６２种、纤毛虫门９９种，其中有８０种为甘肃省新纪录。     

兰州地区白粉菌（Erysiphaceae）的研究（Ⅱ）

继文[1]之后,记述了兰州地区白粉菌19种,其中8种为甘肃新分布种。     

兰州九洲台黄土剖面古地磁研究

兰州黄土剖面厚约335m。含有28层淡红褐色古土壤,该剖面共采集古地磁样品约10块。进行了岩石磁学和古土壤学方面的研究。结果表明:该剖面所含磁性矿物主要为磁铁矿,并含极少量赤铁矿、钛铁矿。天然剩磁强度平均为5×10~(-5)emμ/cm~3,磁化率为60-20×10~(-6)emμ/oc、B/M界限位于L_8中,哈拉米洛(J)亚带位于S_(10)至S_(11),在B/M界限与J亚带之间有一正极性地层段,为松山负极性时最末期的一次正极性倒转,兰州黄土最早形成于14×10~5年。     

兰州兰电电机有限公司

兰州兰电电机有限公司（原兰州电机厂）是西北地区最大的电机和发电设备的制造企业，国家一级企业、一级计量企业。国家企业技术中心，甘肃省风电成套工程技术研究中心，并通过ISO9001和GJB9001A质量管理体系认证。拥有电机、绝缘、计算机、控制及成套等领域的技术专家（享受国务院津贴）8人、高级工程师66人、工程师280多人的技术团队。     

兰州文昌阁黄土——基岩滑坡临滑预报

文昌阁巨型黄土一基岩滑坡位于兰州市西固区达家台台缘,自1995年1月滑坡后缘出现拉张变形裂缝后,滑坡体的运移速度不断加大,滑坡险情严峻.根据滑坡变形特征和长期的滑坡动态监测结果,应用变形控制方法,于滑坡发生前10天进行了临滑预报,划定了滑坡压埋范围,及时疏散了人员财产.1999年7月23日上午8时,体积达110×104 m3的文昌阁巨型黄土一基岩滑坡发生大规模滑动.由于进行了准确的临滑预报,实施了科学的防灾对策,避免了重大灾害损失.     

兰州市钟虫属原生动物

作者于1987年4～6月及1988年4～6月对兰州市钟虫属原生动物进行了调查,共发现15种钟虫,其中小口钟虫分布最广,而且在多污性水体中为优势种,可作为多污性水体的主要指示原生动物种群.     

关于兰州碑林地质病害的分析和探讨

兰州碑林地质病害属于典型的黄土地区填土变形问题,具有一定的特殊性,亦有广泛的代表性.对兰州碑林地质病害进行了较为系统地分析,并提出了相应的治理措施,同时警示在类似的建设活动中,应重视加强对填土的处理,并加强日后运营的管理.     

兰州市城关区大气颗粒物分析研究

利用兰州市大气颗粒物监测条件，分析了大气颗粒物浓度变化与气象条件的关系，并从该区污染状况考虑。利用化学平衡法将主要污染源对大气粒物的贡献率，分别就采暖期与非采暖期进行了计算。对该区的污染特征及其在采暖期与非采暖期的变化做了初步的分析。     

兰州西固区SO2排放总量控制之研究

以复杂地形上的平流扩散模式和高斯扩散模式相结合计算城市大气污染传递函数和污染源的分担率，在此基础上，以ＳＯ２的年日平均浓度作为控制标准，提出了以Ａ－Ｐ控制为基础的区域总体优化的总量控制方案、计算了兰州西固区ＳＯ２的基础，平权，优化三种允许排放量及其相应的削减量。