降水现象与雨量自记不一致的原因分析

气象观测是气象业务和服务工作的基础 ,观测记录必须准确、及时。但是在特殊情况下 ,有些观测记录和天气实况可能产生矛盾 ,需要观测人员做出正确的判断 ,保证观测记录的完整性和准确性 ,同时针对具体情况查明原因 ,采取适当的补救措施。本人在多年的地面观测实践中 ,就发现降水现象和自记雨量往往有不一致的地方 ,特别是在微量降水的情况下 ,有时自记雨量仍然划平线显示不出雨量来 ;而在没有降水的情况下 ,有时雨量自记迹线出现上升 ,显示出有降水量。这些情况在当时如果不能作出正确的判断 ,则可能造成记录失真。特别是不守班的气象台站 ,…     

孝泉气田CX108井侏罗系储层压裂施工失败原因分析

孝泉气田我系蓬莱镇组气藏属致密砂岩气藏,储层压裂改造技术一直没有突破,障碍了对该区块地勘探开发步代,本文重点以ＣＸ１０８井裂度验为例,从地质因素和压裂施工参数入手,对造成该井压旗子工失败的多种原因作出详细分析,据此提出一系裂建议,以期为孝泉为气田压裂改造技术的突破作出有益的探索。     

浅析倾斜建筑物纠偏

本文主要由建筑物倾斜的主要原因、倾斜建筑物纠偏扶正的基本方法和倾斜建筑物纠偏程序三大部分组成。首先从①基础埋深较浅、岩土承载力受大气降水和斜坡坍塌影响较大;②建筑物受人类活动影响,水文地质条件发生了重大变化;③在建筑物附近开挖深基坑引起侧向卸荷;④建筑物所在斜坡失稳;⑤地震;⑥地下水流动带走地基土细颗粒等6个方面系统地分析了造成建筑物倾斜的主要原因;针对不同原因和倾斜建筑物结构特点,按浅基倾斜建筑物、深基倾斜建筑物和不稳定斜坡上的倾斜建筑物三大类型,详细地叙述了它们的纠偏加固方法及适用条件、优缺点;最后提出纠偏需要遵循的一般程序。     

单相接地故障对城市照明配电系统的损害

本研究根据城市照明配电系统的运维经验,描述了城市照明配电系统单项接地事故的基本特征,分析了城市照明配电系统接地事故的根本原因,提供了处理城市照明配电系统单项接地故障,降低故障损害的方法,提出了降低城市照明配电系统单项接地故障的措施,希望对控制单相接地故障,提高城市照明配电系统稳定水平有所帮助。     

一座挡墙倒塌原因分析与修复建议

简要介绍了一座衡重式挡墙倒塌实例,通过理论计算阐明了倒塌原因,指出了修复方案。     

导致土地信访的四大法制缺陷

之所以会产生土地信访事件,普通民众话语权的缺乏是深层次原因,地权歧视是根本原因,不完善的征地制度是直接原因、权利救济制度的空转是现实成因。     

加强建设用地批后监管实现土地有效利用的思考

中国处于经济快速发展阶段,建设用地需求日益激增的大背景下,建设用地普遍存在重批轻管的现象,批后管理环节比较薄弱。对于建设用地批后监管"难"的问题,本文通过深入分析建设用地批后监管的现状,以及监管"难"的原因,就如何加强对建设用地批后监管对策与措施。     

盘活闲置低效用地潜力大

正今年上半年,我们先后对12个省16个开发区的土地利用现状进行了全面深入的了解,并有针对性地推出了盘活低效用地的措施。第一,闲置低效用地的产业结构差异很大,存在于商品用地等各类用地中,主要集中在房地产用地。第二,闲置低效用地的成因复杂,主要是四大方面,一是政府原因。土地利用规划的龙头、管控     

Distribution of dissolved oxygen and causes of maximum concentration in the Bering Sea in July 2010

According to data obtained in the Bering Sea during the 4th Chinese National Arctic Research Expedition, the distribution of dissolved oxygen(DO) was studied, causes of its maximum concentration were discussed, and the relationships between DO and other parameters, such as salinity, temperature, and chlorophyll a were analyzed. The results showed DO concentration ranged from 0.53 to 12.05 mg/L in the Bering Sea basin. The upper waters contained high concentrations and the maximum occurred at the depth range from 20 to 50 m. The DO concentration decreased rapidly when the depth was deeper than 200 m and reached the minimum at the depth range from 500 to 1 000 m, and then increased slowly with the depth increasing but still kept at a low level. On the shelf, the DO concentration ranged from 6.53 to 16.63 mg/L with a mean value of 10.75 mg/L, and showed a characteristic of decreasing from north to south. The DO concentration was higher in the area between the Bering Sea and Lawrence Island and was lower in the southeast and southwest of Lawrence Island at the latitude of 62°N. The formation of maximum DO concentration was concerned with phytoplankton photosynthesis and formation of the themocline. To the south of Sta. B07 in the Bering Sea basin, the oxygen produced by photosynthesis permeated to the deeper water and the themocline made it difficult to exchange vertically, and to the north of Sta. B07, the maximum DO concentration occurred above the themocline due to phytoplankton activities. On the shelf, the oxygen produced by phytoplankton photosynthesis gathered at the bottom of the thermocline and formed the DO maximum concentration. In the Bering Sea basin, the DO and salinity showed a weak negative correlation(r=0.40) when the salinity was lower than 33.1, a significant negative correlation(r=0.92) when the salinity ranged from 33.1 to 33.7, and an irregular reversed parabola(r=0.95) when the salinity was greater than 33.7.