Lushan M_S7.0 earthquake:A blind reserve-fault event

In the epicenter of the Lushan MS7.0 earthquake there are several imbricate active reverse faults lying from northwest to southeast,namely the Gengda-Longdong,Yanjing-Wulong,Shuangshi-Dachuan and Dayi faults.Emergency field investigations have indicated that no apparent earthquake surface rupture zones were located along these active faults or their adjacent areas.Only brittle compressive ruptures in the cement-covered pavements can be seen in Shuangshi,Taiping,Longxing and Longmen Townships,and these ruptures show that a local crustal shortening occurred in the region during the earthquake.Combining spatial distribution of the relocated aftershocks and focal mechanism solutions,it is inferred that the Lushan earthquake is classified as a typical blind reverse-fault earthquake,and it is advised that the relevant departments should pay great attention to other historically un-ruptured segments along the Longmenshan thrust belt and throughout its adjacent areas.     

Sedimentation processes and sedimentary characteristics of tidal bores along the north bank of the Qiantang Estuary

A tidal bore is a unique Earth surface process, characterized by its highly destructive energy, predictable periodicities and magni-tudes, and the production of characteristic sedimentary features. Tidal bores and associated rapid flood flows are highly turbulent flows of the upper-flow regime with a velocity over several meters per second. Reynolds (Re) and Froude (Fr) numbers, respectively, are larger than 104 and 1.0, making them significantly different from regular tidal flows but analogous to turbidity currents. Until now, understanding of tidal-bore depositional processes and products has been limited because of the difficulty and hazards involved with gauging tidal bores directly. The Qiantang bore is known as the largest breaking bore in the world. Field surveys were carried out in May 2010, along the north bank of the Qiantang Estuary to observe the occurrence of peak bores, including regular observations of current, water level and turbidity at the main channel. Several short cores were sampled on the intertidal flats to study the characteristic sedimentary features of tidal bores. Hydrodynamic and sedimentological studies show that the processes of sediment resuspension, transport and deposition are controlled primarily by the tidal bores, and the subsequent abruptly accelerated and decelerated flood flows, which only account for one tenth of each semidiurnal tidal cycle in the estuary. Tidal-bore deposits are generally poorly sorted because of rapid sedimentation after highly mixed suspension by intense turbulence. This behavior is characteristic of the absence of tractive-current depositional components in a C-M diagram. It also goes along with well-developed massive bedding, graded bedding, basal erosion structures, convolute bedding and dewatering structures. Together, these sedimentary features can constitute fingerprinting of turbidites, widely distributed in the deep-water environment. However, a tidal bore is triggered by intensely deformed tidal waves propagating into a shallow-water environment, which returns to regular tidal flows rapidly after the passage of the bore head. The tidal-bore deposits are usually bounded by the intertidal-flat deposits with typical tidal beddings at the top and on both flanks. The difference between tidal-bore deposits (TBD) and tidal sandy/muddy deposits (TSD/TMD) is evident not only in sedimentary structures, but also in the grain-size composition. They can be clearly distinguished in grain-size bivariate plots, typically the plot of mean grain size vs. standard deviation (or sorting). Some trend variations generally exist in mean grain size with TBD>TSD>TMD, sorting with TMD>TBD>TSD (larger value indicating poorer sorting), and both skewness and kurtosis with TSD>TBD>TMD. These findings will undoubtedly shed new light on our understanding of tidal-bore sedimentology, ancient tidal-bore sedimentary facies and environments, and related oil-and-gas field prospecting.     

岩溶地区桥梁桩基施工方法

通过某特大桥钻孔桩施工,介绍溶洞地区桥梁桩基施工常出现的问题、施工工艺、质量检测和预防处理措施.     

Improved area-difference-based recovery information placement

<正> In mobile computing systems,message logging can be used to provide fault tolerance for mobilehosts.Due to the mobility of mobile hosts,their recovery information,including logged messages andcheckpoints,may spread throughout mobile support stations.During recovery,there will be a considerablecost for the collection of recovery information.To speed up recovery and to reduce the failure-freeoverhead,an improved area-difference-based scheme is proposed.It tries to keep recovery informationevenly spreading over an area.Only part of recovery information needs to be migrated for controlling thedistribution of recovery information.To reduce the migration cost,a light-weight migration is also proposed.In the performance study,we give an analysis of the probability that the light-weight migrationtakes place.     

春秋文字发展演变的初步考察

据目前所见出土古文字材料,春秋时期新造汉字593个,汉字系统进一步趋向完善和稳定,表意构件系统已比较成熟。汉字构形方式系统进一步调整与优化,表意类构形方式的功能趋向更加衰弱,形声构形方式的优势地位继续加强。汉字字形演变存在省简、增繁、替换和讹变等多种形式,有少数字形经变异后成为定型而进入文字系统传承,不过大多数汉字形体结构相对稳定。汉字的发展演变既表现为时代性的演进,同时又开始形成地域性风格特征。     

南昌滕王阁明清庾楼群汇考——江右史话批判之四

本文通过地毯式发掘、排比明、清江右省、府、州、县、厅<官志>"省会水次漕仓"原始档案,系统还原明、清两代五个半世纪间.南昌章江水次五十余县邸阁漕仓"望江楼"群密集汇聚历史原貌;率先揭举明景泰三年又嘉靖六年江右官宪挪移高安等县废仓直接改筑滕王阁之滕学建筑秘史;并深刻揭示汉晋邸阁隋唐转型运动虽降至明、清,仍不断重复其农业文明仓储文化遗传基因漕仓邸阁/名胜楼阁/会馆公寓等社会政治、经济、文化三重复合身份循环转换的生命轮回模式;全面辩证洪州滕王阁原生态邸阁历史文化圈自然、人文、经济地理学核心价值;穿透封建史学迷雾与江右史话泡沫,复原千古名楼滕王阁庐山真面目.     

Effect of intermittent aeration on the treatment performance in a submerged membrane bioreactor

In order to improve removal for nitrogen in a pilot-scale submerged membrane bioreactor (SMBR), intermittent aeration was conducted, and the effect on the treatment performance under four kinds of operation condition (run 1, continuous aeration; run 2, 60/60 min aeration on/off time; run 3, 60/90 min aeration on/off time; run 4, 60/75 min aeration on/off time) was evaluated. The results showed that depending on the specific on/off of the aeration time ratio, removal efficiency of nitrogen could be improved significantly, and the removal rates of total nitrogen (TN) under different operation conditions were 28.0%, 59.5%, 66.8% and 70.7%, respectively. There were no obvious differences for removal rates for COD_Cr and ammonia among different operation conditions. In general, intermittent aeration could be used as a feasible way to improve treatment performance for nitrogen in the SMBR.     

The impact of warrants introduction: Sign effect or magnitude effect?

The data of warrants underlying stocks was selected for the sample period from August, 2005 to December, 2009. These data the authors collected did not include the announcement date of reform of non-tradable underlying shares, and was available from Shanghai and Shenzhen stock exchanges. The event study method is employed to test the magnitude effect based on the Wild bootstrap, which is performed on the abnormal return, the cumulative abnormal return, and the standardized cumulative abnormal return. Empirical results show no evidence of magnitude effect but sign effect after warrants introduction. The authors argue that this phenomenon is caused by the migration of radical agents from stock market to warrant market.     

庄子忠孝观的学理解析

庄子关注人生,受儒家思想的影响,认识到忠孝在社会存在的必然性。庄子从名实和真假关系出发,批判了世俗错误的忠孝观,提出了"不用而寓诸庸"的践行忠孝的方法。庄子理想的忠孝观是"入于寥天一"。     

TPU/POE共混体系相分离过程的ATR-FTIR研究

探讨了一种新的共混体系热塑性聚氨酯(TPU)/聚乙烯-辛烯共聚物(POE)共混体系,在相分离过程中衰减全反射傅里叶变换红外光谱(ATR-FTIR),结果发现:对于不相容TPU/POE体系,随着热老化时间的增加,ATR-FT-IR特征峰面积也逐渐增加(温度较低除外),温度较高时则先增加后降低;而PU/POE/POE-g-...