直立土钉墙技术在苏州基坑围护中的成功应用     

黄跃进 《江苏国土资源》2000,25(2)

苏州星海大厦基坑面积大,开挖深度达10.8 m,采用直立式土钉墙支护设计获得了成功.施工中坚持信息法,科学安排挖土顺序, 使地应力均匀释放.合理地降低了地下水位,在软弱地层中采取了二次注浆技术,提高了土钉锚固力.  相似文献   

鱼塭产斑节对虾(Penaeus monodon)催熟繁殖技术研究     

杨小立  黄爱贞  黄德 《广东海洋大学学报》1999,(2)

以综合催熟措施和移植精荚手术相结合的技术方法，解决了鱼塭产斑节对虾催熟效应期长，产卵率低，易蜕壳失去精荚等难题。使用 ２７８ 尾雌虾，催熟率达９０％ 以上，在４０ ｄ 内共产卵６０８ 尾次，卵量１８ ５３０ 万粒，孵出无节幼体１１ ９９８ 万尾，平均孵化率 ６４．７％ ，平均每尾雌虾孵出无节幼体 ４３．１ 万尾，育成商品虾苗 １ ０２８．５ 万尾，育苗平均成活率 １３．６％ ，试养成活率５７．１％  相似文献   

从萤石资源看丽水发展氟化工前景     

黄金阳  赵力强 《浙江国土资源》1999,(1)

本文从萤石资源的分布特点、开发利用状况、国内外市场需求及资源保证程度等不同角度进行综合全面分析预测，阐述了丽水地区发展氟化学工业的可行性。  相似文献   

等离子体背景参数对尖峰辐射的影响     

黄光力  王德焴 《中国天文和天体物理学报》1991,(4)

本文在电子回旋脉塞不稳定性理论的基础上,着重讨论了等离子体背景参数ω_(pe)/Ω_e对尖峰辐射性质的影响,内容包括:该参数的物理意义、取值范围,以及在尖峰辐射性质中,对ω_(pe)/Ω_e的变化比较敏感的偏振和谐波结构,等等。  相似文献   

Impact of the Kuroshio Current on the South China Sea based on a 115 000 year diatom record     

Hui Jiang  Svante Bjrck  Lihua Ran  Yue Huang  Jiayin Li 《第四纪科学杂志》2006,21(4):377-385

We used the tropical oceanic planktonic diatom species Nitzschia marina, Rhizosolenia bergonii and Azpeitia africana/Azpeitia neocrenulata, most commonly found in the surface sediments of the northeasternmost South China Sea (SCS) where the Kuroshio Current enters the SCS through the Bashi Strait north of Luzon, to analyse the influence of the the Kuroshio Current on the SCS. The impact of the Kuroshio Current seems to be relatively strong during major warm periods and, to a lesser degree, in minor warm periods during the last 115 000 years. The strongest influence took place during the main part of the Holocene and during the very late phase of Marine Isotope Stage (MIS) 5e. It is possible to distinguish two magnitudes of change in the impact of the Kuroshio Current on the SCS: large changes occurred at shifts between glacial and interglacial conditions, while smaller changes seem to have recurred in both glacial and interglacial episodes as well as during the Holocene. Climatic/oceanographic changes and sea‐level variations were possibly the two most important mechanisms for the varying influences of the Kuroshio Current on the SCS. The interaction between the Kuroshio Current and monsoon‐related processes may also have played a role. However, because of restricted knowledge of the present‐day Kuroshio Current and the absence of a modern analogue to the ancient SCS due to the marked changes in palaeogeography, this relationship is difficult to establish. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

厦门GPS基准站建设与试运行     

张远城  熊先保  黄晓华 《大地测量与地球动力学》2003,23(3):125-126

全面叙述中国地壳运动观测网络中25个基准站之一——福建GPS基准站的设计、选址、建造和仪器安装等建设过程及试运行至今的情况和有关参数。其中对某些防护措施如防雷措施有较详细说明。为今后GPS基准站的建设提供了系统性的经验。  相似文献   

成都花卉塑料薄膜大棚热量平衡初探     

黄斌  罗秀陵 《成都信息工程学院学报》1993,(3)

本文在测量的基础上,对热量平衡各分量在大棚内、外的差异,进行了比较与分析,对大棚生产管理有重要参考价值。  相似文献   

Study on methods of land use dynamic monitoring at county level     

Lin-yi Li  Fang Huang  Zhao-li Liu  En-pu Wan 《中国地理科学(英文版)》2001,11(2):181-185

Remote sensing technique has played an important role in land use dynamic monitoring, but as for the land use dynamic monitoring at county level, traditional remote sensing methods such as satellite imagery visual interpretation and computer classification can not meet its demand for accuracy. The result of 1: 10 000 land use investigation map has high accuracy, but this method can not be used to dynamically monitor the land use because of its big expenses, long period and difficulty in updating data. In this paper, the characteristics of physiognomy, climate and the status of land use in Dehui County are taken into consideration and a set of method, which takes use of 3S techniques and applies to Northeast China Plain, is come up with. When the land use type of a land parcel changed as a whole, the date updating can be make by changing its land type ID in the attribute table in a GIS. When the land use type of an irregular area changed, GPS receivers are used to position its border. This set of method is characteristic of high accuracy and low expenses. It gets the information of land use change timely and can be used to dynamically monitor the land use. Foundation item: Under the auspices of the key project of the National Ninth Five-year Plan (96-B02-01-07). Biography: LI Lin-yi (1968 —), female, a native of Jilin, Ph. D. candidate of Changchun Institute of Geography, the Chinese Academy of Sciences. Her research interest includes land use change monitoring and crop yield estimation using “3S” techniques.  相似文献   

Some characteristics of pulsations in radio bursts at 9.375 GHz     

Zhihai Qin  Guangli Huang 《Astrophysics and Space Science》1994,218(2):213-222

A type of pulsation in a time scale of seconds superimposed on microwave burst at 9.375 GHz has been found during the twenty-second solar active maximum period by us. This phenomenon is quite different from radio spike emission at decimeter and long centimeter wavelengths. The flux level of the bursts rises as the repetition rate of pulsations increases, following an approximate linear relationship. This feature resembles that at mm wavelength, but some other features are different. Some mechanisms for interpretation have been proposed.  相似文献   

山区≥10℃积温推算方法的讨论     

黄克新  宁晓松 《山地学报》1991,(1)

本文探讨了几种推算山区≥10℃积温的方法,认为由我国学者所采用的直方图推算法以及计量地理学中的三元线性回归数学模型推算法,在实际应用中都存在不完善和局限性,将两者结合起来进行复合推算,是一种较理想的研究方法。  相似文献