检索结果-南通市图书馆

Study on Design of Protective Coal Pillar for High Buildings

在线全文

cnki会议

学校读者我要写书评

暂无评论

Study on Design of Protective Coal Pillar for High Buildings

2.10(沈阳)国际安全科学与技术学术研讨会

作者： CHAI Hua-bin~(1,2. (1.State Bureau of surveying and Mapping Key Laboratory of Mine Spatial information Technologies,{2. polytechnic university,jiaozuo {2. 454003,china 2.school of surveying and land information {12.,{2. polytechnic university,jiaozuo 454003,china)

＜正＞Considering the fact that the protective coal pillar is affected by the point load of high buildings,the calculating formula of the critical load and actual load of the protective coal pillar were worked *** the stability of the protective coal pillar under the load of the high buildings on the ground was analyzed by the *** to the geometric and physical natures of the major influence radius,which is one of the predicting parameters of surface displacement and distortion,a simple and useful method of designing protective coal pillar for high buildings were *** shows that the mining rate and the stability of the protective coal pillar can be improved,at the same time the ground high buildings can be protected from the mining damage by adopting the method.

关键词： high building protective coal pillar major influence radius stability

Determination of ocean tide loading displacements in Hong Kong using GPS technique

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science china Earth Sciences 2010年第7期53卷 993-1007页

作者： YUAN LinGuo1,3, DING XiaoLi1, SUN HePing2. ZHONG Ping1,3 & CHEN Wu1 1 Department of land surveying and Geo-Informatics, The Hong Kong {2. university, Kowloon, Hong Kong, china 2.Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, china 3 Department of surveying engineering, school of Civil engineering, Southwest Jiaotong university, Chengdu 610031, china 1. Department of land surveying and Geo-Informatics The Hong Kong Polytechnic University Kowloon Hong Kong China3. Department of Surveying Engineering School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China2. Key Laboratory of Dynamic Geodesy Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China

Ocean tide loading (OTL) displacements of eight principal constituents at 12.sites in Hong Kong were determined using more than eight years of continuous GPS observations. Parameters of the OTL displacements were estimated using daily GPS solutions obtained with precise point positioning (PPP) technique. The results were compared with predictions from seven latest global ocean tide models. Gravity measurements of OTL in Hong Kong were also used to validate the GPS results. The study shows that the results from both the GPS and gravity measurements agree best with the GOT4.7 and NAO99b models, when the K1 and K2.constituents are excluded. The agreements between the GPS and the model estimates are generally at sub-millimeter level in both the horizontal and vertical directions, except for S2. K2.and K1 constituents that have relatively larger errors. After removing the systematic biases between the GPS and the model estimates, the misfits of M2. S2. N2. O1, P1 and Q1 at all sites are within 0.5 and 1.0 mm in the horizontal and the vertical directions, respectively, whereas K1 and K2.show relatively larger misfits of up to 2.3 mm. Both the GPS and the gravity S2.estimates have large biases with unknown reasons when compared with the modeled values, which needs to be further investigated. The study demonstrates that GPS is capable of estimating the OTL displacements with the same accuracy as the model predictions, especially for coastal areas.

关键词： GPS ocean tide loading ocean tide model site displacement

维普期刊数据库

The Application Study about Ground-Based GPS Precipitable Water Vapor in Shijiazhuang and Qinhuangdao Region

在线全文

学校读者我要写书评

暂无评论

The Application Study about Ground-Based GPS Precipitable Wa...

2.10 3rd IEEE International Conference on Computer Science and information Technology—ICCSIT 2.10

作者： Wang Yong 1 2 1.College of Traffic and surveying Hebei polytechnic university Tangshan china 2.Key Laboratory of Mine Spatial information Technologies (henan polytechnic university henan Bureau of surveying and Mapping) State Bureau of surveying and Mapping jiaozuo china Ding Keliang school of surveying and Civil Spatial information Beijing university of Civil engineering and Architecture Beijing china He Rong school of surveying and land Infomation engineering henan polytechnic university jiaozuo china Liu Yanping College of Traffic and surveying Hebei polytechnic university Tangshan china

Water vapor is a highly variable parameter in atmospheric processes and it plays a crucial role in atmospheric motions on a wide range of scales in space and time. GPS technique has been widely used in retrieving precipitable water vapor. Firstly the article has retrieved precipitable water vapor of Qinhuangdao and Shijiazhuang stations by GPS technique. Then it has researched two aspects of precipitable water vapor. One is the spatial and temporal distribution characters of precipitable water vapor;the other is the relation between precipitable water vapor and actual rainfall. The value of GPS precipitable water vapor of Shijiazhuang is higher than the value of GPS precipitable water vapor of Qinhuangdao, which is accord to the formula that the precipitable water vapor is reduced from south to north. During the different time of a day, there are differ degree fluctuate which the min value present to morning and the max value present to evening. It also compared the GPS precipitable water vapor and actual rainfall. Although the time of max value about rainfall is not identical to the time of max value about precipitable water vapor, rainfall has occurred mostly in the time while the value of precpitable water vapor is high.

关键词： Global positioning system Precipitable water vapor Zenith tropospheric delay Zenith wet delay

SIMULATION OF THE CHANGE OF REGIONAL ECOSYSTEM SERVICES VALUE BASED ON CAMARKOV MODEL

在线全文

cnki会议

学校读者我要写书评

暂无评论

SIMULATION OF THE CHANGE OF REGIONAL ECOSYSTEM SERVICES VALU...

第三世界生态高峰会

作者： Chen Qiuji~(1,2. Kong Yunfeng~1 LIU Changhua~2.YAO Wanqiang~3 1 College of Environment & Planning,henan university,Kaifeng 475001,henan.china 2.College of surveying and land information engineering,henan polytechnic university,jiaozuo {12.,henan,china 3 surveying Departmet,Xian university of Science and Technology,Xian 710054,Shaanxi,china)

The value of ecosystem services,the possibilities and rationalities of evaluating these services attract interests of many ecologists and ***,the dynamic change of ecosystem services is less *** this paper,the dynamic simulation method(***(?) MARKOV)is used to simulate the change of ecosystem services value in research ***(?)MARKOV is a combined cellular automata and Markov change prediction method that adds an element of spatial contiguity as well as knowledge of the likely spatial distribution of transitions to Markov change *** main objectivc of this study is to give comprehensive and reasonable assessment of the ecosystem services value change in the research area,which would provide scientific basis for environment,ecosystem construction and strategic *** on the remote sensing dada of year 1992.and 2.01,the landscape information of research area is obtained,and the transfer matrix among various landscapes is calculated during the period,then the data of landscape of research area in year 2.10 is predicted using the model of *** order to understand the distribution of landscape,the CA model is used to simulate the distribution of landscape based on the suitability of landscape and the predicted data With the help of GIS software *** the change of ecosystem services value is calculated based on the value coefficient of various *** the ecosystem services value constitute of year 2.10,the ecosystem value of cultivated land is the maximum,amounting to 58.51 million RMB and accounting for 42.2.% of the sum value of ecosystem *** next important landscape type is water area, the ecosystem services value is about 54.91 million RMB,accounting fbr 39.63% of the sum value of ecosystem *** is the forest land and grass land,the ecosystem services value respectively is 19.77 million RMB and 4.37 million RMB,with the proportion respectively is 14.2.% and 3.96%.Compared with year 2.01,th

关键词： ecosystem services value Markov cellular automata landscape

Statistical characteristics of chlorophyll-a concentration in Hong Kong's coastal waters

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2002年第3期12卷 331-342页

作者： CHEN Xiaoling, Yok Sheung Li, LI Zhilin(1. Dept. of Civil and Structural engineering, The Hong Kong polytechnic {2., Hong Kong, china 2. National Laboratory for information engineering in surveying, Mapping and Remote Sensing (LIESMARS), Wuhan Uni Dept. of Civil and Structural engineering The Hong Kong Polytechnic University 香港 Wuhan university National Laboratory for Information Engineering in Surveying Mapping and Remote Sensing (LIESMARS) Wuhan 430072 Dept. of land surveying & Geo-Informatics The Hong Kong Polytechnic University 香港

In this paper seven of the ten Water Control Zones (WCZs) in Hong Kong's coastal waters with monthly or bi-weekly sampling data of 17 parameters collected at 37 monitoring stations from 1988 to 1999 were selected to analyze the spatial and temporal variations of chlorophyll-a and its influencing factors. Cluster analysis was employed to group the monitoring stations based on the structure of the data set. Multiple step regression was employed to determine the significant influencing factors of chlorophyll-a level. The results suggest that all the monitoring stations could be grouped into two clusters. Cluster Ⅰ with frequent red tide incidents comprises two WCZs which are semi-enclosed bays. Cluster Ⅱ with less red tide occurrence comprises the other five WCZs in an estuarine environment in the west. For both clusters, the organic contents indicator, BODS, was a common significant influencing factor of the chlorophyll-a level. Nitrogen and light penetration condition related to turbidity, total volatile solids and suspended solids had more influence on the cholophyll-a level in Cluster Ⅰ than in Cluster Ⅱ, while phosphorus and oceanographic conditions associated with salinity, temperature, dissolved oxygen and pH were more important in Cluster Ⅱ than in Cluster Ⅰ. Generally, there was a higher average chlorophyll-a level in winter and autumn in a year. The chlorophyll-a level was much higher in Cluster Ⅰ than in Cluster Ⅱ among all seasons. Although the chlorophyll-a concentration had great variations from place to place in Hong Kong's coastal waters, it seemed to have a common long term fluctuation period of 8-10 years with a high-low-high variation in the period in the whole region, which might be influenced by other factors of global scale.

关键词： Hong Kong's coastal waters chlorophyll-a concentration spatial-temporal variations

维普期刊数据库

Vision Autonomous Relative Navigation Algorithm for Distributed Micro/Nano Satellite Earth Observation System Based-on Motor Algebra

在线全文

学校读者我要写书评

暂无评论

Vision Autonomous Relative Navigation Algorithm for Distribu...

2.09 International Conference on Environmental Science and information Application Technology

作者： Kezhao LiQinglin Wang .school of Survery&land {2. engineering henan polytechnic university College of Geology engineering and Geomatics Chang’an university jiaozuo 454003 china Qin Zhang Chaoying Zhao College of Geology engineering and Geomatics Chang’an university Xi’an 710054 china

Along with the development of space science and technology,it is not a heart-stirring thing to launch a satellite successfully any *** we pay greatly attention to space autonomous rendezvous and docking（AR＆D）in space operations,such as maintaining,assembling,attacking *** that autonomous relative position and pose is one of key technologies of these space ***,celestial Navigation System（CNS）,Inertial Navigation System（INS）,Global Navigation Satellite System（GNSS）,such as GPS,GLONASS,GALILEO and Compass etc,and the integrations of them are some methods of autonomous navigation for *** these methods must be depended on the high speed links of the communications ***,the precision of CNS is always worse,and can not meet the rigorous requirement of the space *** can not be used for long-term space navigation applications for its errors being *** accuracy can be met by Carrier Differential Global Positioning System（CDGPS）,but it is difficult to calculate the ambiguities of ***,autonomous relative position and pose based on machine vision is a direction all over the world currently,and is very suitable for autonomous spacecraft navigation because it has some advantages,such as low-cost,high precision,autonomous ability,easy practicality ***,there are some disadvantages of some relative navigation algorithms based-on machine vision,such as complicated description,huge calculation burden,and lack of real-time ability ***,the rigid motion of 3D objects can be represented by motor algebra,and the rotation and translation transformations can be calculated *** it is more effective for dealing with relative navigation of distributed micro/nano satellite earth observation *** this paper,on the basis of the attitude dynamics of spacecrafts and the theory of machine vision,an autonomous relative navigation algorithm for distributed micro/nano satellites based on motor

关键词： Motor algebra vision autonomous relative navigation dstributed micro/nano satellite earth observation

在线全文

cnki会议

学校读者我要写书评

暂无评论

岭谷组合地形的植被空间变异性对比及成因

山地学报 2009年第1期27卷 14-23页

作者：郝成元张永领吴绍洪河南理工大学测绘与国土信息工程学院中国科学院地理科学与资源研究所

滇西南山地纵向排列着老别山、邦马山、无量山、哀牢山,其对气候因子及植被生态的影响一直是我国山地生态学的主要研究内容之一。采用moran系数(MC)度量了植被主要气候因子的空间自相关程度,通过构建半变异函数研究了EVI各向异性及其气... 详细信息

滇西南山地纵向排列着老别山、邦马山、无量山、哀牢山,其对气候因子及植被生态的影响一直是我国山地生态学的主要研究内容之一。采用moran系数(MC)度量了植被主要气候因子的空间自相关程度,通过构建半变异函数研究了EVI各向异性及其气候因子的空间变异特征。结果显示:4山地气候因子的空间分异特征与地形走向吻合,表现出南-北方向的自相关程度较大,东-西方向自相关程度最小,表明山地延伸方向上'通道'作用明显而山地排列方向上'阻隔'作用显著;哀牢山和老别山的'阻隔'作用较大、景观异质性复杂,邦马山和无量山的'阻隔'作用较小、景观变化方向性不鲜明。总之,各纵向山地的'通道-阻隔'作用与各山地走向、规模大小密切相关。

关键词：岭谷组合地形增强型植被指数空间变异各向异性通道-阻隔作用

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

高尔夫球场建设中的测量方法探讨

科技资讯 2014年第7期12卷 39-40页

作者：赵占辉河南理工大学测绘与国土信息工程学院

介绍了云台山某高尔夫球场建设项目的测量任务、测量依据,分析了工程测量、工程放样工作流程,及其工程测量实施方案、高尔夫球场建设中测量技术方法,能直接用来指导高尔夫球场工程造型建设,对高尔夫球场建设行业具有一定的指导意义。

关键词：高尔夫球场工程测量工程放样粗造型细造型

The Influence of surveying method on mechanical-electrical properties of smart mortar

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Influence of surveying method on mechanical-electrical p...

第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： Rong YAO 1,2.a Zhen-chong WANG 1,b Yu-bo ZHANG 2.c 1school of Mechanical and Electronic information {2., china university of Mining Technology, Beijing.100083 2.0} of Materials of henan polytechnic university,jiaozuo.454003

To a certain mortar, the identical measuring means can results in quite difference .Through determination intelligence concrete mortars mechanical -electrical with direct current （D C） ,alternating circuit（AC） ,direct bridge（DB） and alternating electric bridge（AEB） ,the authors points out the outcomes stability from DC and DB get worse because they can′t dispel polarization existed in mortar itself. On the contrarory , both AC and AEB can . At the same time ,The authors discussed the influence on impedance （Z） of difference equivalent and frequency, and found that the using of series connection and high frequency sine wave can released Z in this materials.

关键词： Smart mortar Mechanical-electrical properties Measuring methods