困境区域范围及其控制对策研究

在道路交通中,由于困境区域的存在,导致了部分车辆驾驶员无意闯红灯行为的发生。为了减少此种状况的出现,本文通过分析研究影响困境区域范围的四个主要因素,提出控制建议并通过驾驶员反应时间因素t的调整．重新给出困境区域范围的计算公式。通过实例计算,分析出困境区域的具体位置及范围,提出在路面特定位置标出提示标志,帮助驾驶员在即将进入黄灯期时,根据其与提示标志间的相对位置关系,客观快速地做出行驶或制动的决策代替主观经验的判断。结果表明,在路口限速为30km／h,单个车道宽3．5m．车长3．5m~5m的情况下,若黄灯时间为2s,则困境区域范围为7．98m＊3．5m≤Skl≤9．48m＊3．5m,若设置成3s．则困境区域范围则缩小为0．31m＇3．5m≤Sk2≤1．19m＊3．5m,应在此处标示困境区域提示带,并在距离路口停车线40．91m处设立减速提示牌。     

已下挠连续梁桥加固方案研究

针对目前一些大跨径预应力混凝土连续梁桥跨中长期挠度过大的问题,以汾江大桥为工程背景,分析导致该桥主梁挠度过大的主要原因。通过实测资料进行计算分析,说明体外预应力加固未能阻止主梁进一步下挠的原因。提出一种以钢箱梁替代跨中梁段的加固方案,通过计算分析其加固效果并与体外预应力加固进行对比,简单分析其可行性并展望应用前景。     

红木雕刻工艺的传承及思考

木雕是以各种木材及树根为材料进行雕刻,是传统雕刻工艺中的重要门类。文章追溯了木雕的发展历史,结合自己的作品对红木雕刻的工艺手法进行了叙述和归纳,并试图通过对红木雕刻生存现状的概述引起社会对这项传统手工艺的关注。     

出砖入史——闽南红砖中的地方记忆与空间转型

建筑是文化的重要组成部分,其技术发展、材料运用与社会文化变迁直接相关,其象征、仪式、居俗是空间策略的反映。砖是重要的建筑材料,闽南建筑的砖瓦作尤为独树一帜。闽南地区在墙面、屋顶、地板多处大量使用当地烧制的红砖,色彩强烈,与中国传统的帝王宫殿近似,因此漫长的历史中,身处"红砖文化区"的泉州民众一直试图解释自身的"僭越"之举。此外,泉州红砖运用方式的变迁也反映海外贸易与文化交流对地方建筑的影响。     

Research on the Mechanical Characteristics of Primary Supporting in Deep Buried Large-section Red Clay TunnelEI北大核心

Research purposes: In the New Austrian Tunneling Method, the primary supporting has the vital function as the main structure of taking the pressure of surrounding rock. In order to study the force characteristics of primary supporting in the composite lining of deep buried large section tunnel, this paper is based on Qingyang tunnel engineering in Yinchuan-Xi'an High-speed Railway. After the on-site monitoring of the process, we can find the variation law of surrounding rock pressure on the deep buried large section red clay tunnel, steel arch internal force and concrete internal force, and analyze the internal forces and distribution characteristics of the primary supporting structure. Research conclusions:(1) The pressure of surrounding rock on both sides of the large section tunnel of red clay is greater than that in the vault and the inverted arch. (2) The internal force of primary supporting structure shows a distribution pattern of big top and small bottom, and the steel arch bears most of the surrounding rock pressure. (3) It can be considered to increase the marking of steel arch frame on the side wall and vault roof, and reduce the section area of arch frame in inverted arch, so as to make full use of materials, reduce the cost and improve the reliability of lining structure. (4) This research conclusion can provide reference for the optimization of lining design and construction organization of tunnel primary support under similar geological conditions. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

Response of benthic infauna and epifauna to ocean disposal of red clay dredged material in the New York Bight: A study using sediment-profile imaging, surface imaging and traditional methods

In 1997, approximately 1 million cubic yards of consolidated red clay was dredged from Newark Bay in New Jersey and deposited on the seafloor at an open-water dredged material disposal site located on the inner continental shelf of the New York Bight. To address concerns about the ability of benthic organisms to colonize the seafloor deposits of this compact, organic-poor red clay, monitoring surveys were conducted in 1998 (1 year after disposal) and 2002 (5 years after disposal). The surveys used a combination of sediment imaging and traditional grab sampling methods to characterize physical and biological conditions over the surface of the red clay deposits in comparison to nearby reference areas consisting of either naturally-occurring, sandy surface sediments or deposits of unconsolidated, muddy dredged material. Sediment-surface and sediment-profile images (SPI) collected in summer 2002 indicated that the surface of the red clay deposits had become much smoother and more heterogeneous in texture compared to images collected in 1998. The images also indicated that these deposits had become colonized to a much greater degree by relatively abundant and diverse infaunal and epifaunal communities compared to 1998. Taxonomic analysis of benthic grab samples confirmed the imaging results and indicated relatively high infaunal organism abundance and diversity over the red clay deposits in 2002 compared to the reference areas. However, the structure of the benthic community inhabiting the red clay was fundamentally different from the communities in the reference areas, due to the differences in sediment texture and composition. The combination of imaging and traditional taxonomic approaches used in this study provided much greater insight on the red clay colonization process than either approach by itself.     

吉怀高速公路红砂岩边坡的稳定性分析和治理

利用极限平衡法和有限元数值法对红砂岩边坡进行全面的稳定性分析,根据失稳前边坡自身抗滑力大小,主动性地提出治理方案。     

论《红楼梦》所体现出的作者的民俗思维观和民俗审美观

《红楼梦》中有大量的民俗内容,作者曹雪芹以自己敏锐的眼光艺术地运用民俗内容,创作了的典型环境、塑造了典型形象、刻画了典型性格、揭示了主题思想,使民俗内容成为《红楼梦》不可或缺的部分,同时《红楼梦》也体现出作者的民俗思维观和民俗审美观。     

The influence of oceanographic scenarios on the population dynamics of demersal resources in the western Mediterranean: Hypothesis for hake and red shrimp off Balearic Islands

The aim of the present paper is to study the relationships between some climatic indices and parental stock, recruitment and accessibility to trawl fishery of hake (Merluccius merluccius) and red shrimp (Aristeus antennatus) off Balearic Islands (western Mediterranean). Available annual catch per unit effort, recruitment and spawning stock biomass have been used as biological data. As environmental data, the meso-scale IDEA index and the large-scale North Atlantic Oscillation (NAO) and Mediterranean Oscillation (MO) indices have been used. To analyze possible links between these indices with the population dynamics of demersal resources, two non-linear approaches have been applied: (i) stock–recruitment relationships from Ricker and Beverton–Holt models, by sequentially incorporating environment factors; (ii) generalized additive modelling, both classical general and threshold non-additive models were considered. The latter simulate an abrupt change in explicative variables across different phases (time periods or climatic index values). The results have shown that two oceanographic scenarios around the Balearic Islands, associated with macro and meso-scale climate regimes, can influence the population dynamics of hake and red shrimp. This is especially true for recruitment, which seems to be enhanced during low NAO and IDEA indices periods. During these periods, colder-than-normal winters generate high amounts of cold Western Mediterranean Intermediate Waters (WIW) in the Gulf of Lions, which flow southwards and reach the Balearic Islands channels in spring, increasing the productivity in the area. This oceanographic scenario could also be favourable to the distribution of hake on the fishing grounds where the trawl fleet targets this species, increasing its accessibility to the fishery. Both spawning stock and abundance of red shrimp seems to be also enhanced by high MO index periods, which could reflect the increased presence of the saline and warm Levantine Intermediate Waters (LIW) in the study area, extending over the fishing grounds of this species. The proposed interactions can be useful to assess and manage these important demersal resources.     

进站接近信号机的信号显示

非自动闭塞区段当列车速度提速为大于120km/h小于160km/h时,应设两个接近区段和接近信号机,对接近信号机红灯的显示方式进行了探讨和方案比选。