检索结果-南通市图书馆

Discovery and Significance of the Triassic–Late Paleozoic Double-layered Basement in the Songliao Basin: Based on the Complete Coring Data from ICDP Borehole SK2

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2024年第S1期 75-76页

作者： yang Zhuolong wang Pujun {2. Youfeng {2. Chuancheng TANG Xin college of Earth sciences Jilin University Research Center of Palaeontology and Stratigraphy Jilin University

The Songliao Basin（SLB） covers an area of approximately 2.0,000 km2.n northeastern Asia and preserves a continuous and complete Cretaceous terrestrial record（wang et al., 2.2.）. The region is the most important petroliferous sedimentary basin in china because of its continual annual oil and gas equivalent production of tens of millions of tons（ca. 2.0–440 million barrels per year） since 1959. The SLB was previously thought to have developed on Hercynian basement and accumulated continuous sedimentary deposits during the Late Jurassic and Cretaceous（Wan et al., {2.3; wang et al., {2.6）.

关键词：

Key technology of mine underground mobile positioning based on LiDAR and coded sequence pattern

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 570-576页

作者： wang Zhi1, 2. WU Li-xin1, 2. LI Hui-ying3 1. college of Resources and Civil Engineering, Northeastern University, Shen{2. 110004, china 2. Academy of Disaster Reduction and Emergency Management, Ministry of Civil Affairs and Ministry of Education, beijing Normal University, beijing 100875, china 3. college of Computer science and Technology, Jilin University, Changchun 130012. china [a] college of Resources and Civil Engineering Northeastern University Shenyang 110004 China [b] Academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs and Ministry of Education Beijing Normal University Beijing 100875 China [c] college of Computer science and Technology Jilin University Changchun 130012 China

Technologies of underground mobile positioning were proposed based on LiDAR data and coded sequence pattern landmarks for mine shafts and tunnels environment to meet the needs of fast and accurate positioning and navigation of equipments in the mine underground without satellite navigation signals. A coded sequence pattern was employed for automatic matching of 3D scans. The methods of SIFT feature, Otsu segmentation and fast hough transformation were described for the identification, positioning and interpretation of the coded sequence patterns, respectively. The POSIT model was presented for speeding up computation of the translation and rotation parameters of LiDAR point data, so as to achieve automatic 3D mapping of mine shafts and tunnels. The moving positioning experiment was applied to evaluating the accuracy of proposed pose estimation method from LiDAR scans and coded sequence pattern landmarks acquired in an indoor environment. The performance was evaluated using ground truth data of the indoor setting so as to measure derivations with six degrees of freedom.

关键词： LiDAR coded sequence pattern mobile positioning SLAM algorithm POSIT algorithm

Biogas recovery from microwave heated sludge by anaerobic digestion

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2010年第1期53卷 144-149页

作者： QIAO Wei1,wang Wei2.ZHU CuiPing3 & ZHANG ZhongZhi1 1 college of Chemical {2. and Engineering,china University of Petroleum,beijing 102.49,china 2.Department of Environmental {2. and Engineering,Tsinghua University,beijing 10084,china 3 J & K china Cleaning Energy Technology Co.Ltd.,beijing 100085,china 1. college of Chemical science and Engineering China University of Petroleum Beijing 102249 China2. Department of Environmental Science and Engineering Tsinghua University Beijing 10084 China3. J & K China Cleaning Energy Technology Co. Ltd. Beijing 100085 China

Biogas generated from sewage sludge,livestock waste,and food waste by anaerobic digestion is a valuable renewable energy ***,conventional anaerobic digestion is not an efficient process.A long hydraulic retention time and low biogas recovery rate hinder the applications of those *** effective pretreatment method to destroy sludge microbial cells has been one of the major concerns regarding improvement of the biogas *** article focuses on the effects of microwave heating on sludge anaerobic *** suspended solid(VSS) and chemical organic demand solubilization of heated sludge were *** heating was found to be a rapid and efficient process for releasing organic substrates from *** increase of organic dissolution ratio was not obvious when holding time was over 5 min with microwave *** effect of the VSS solubilization was primarily dependent on heating *** highest value of VSS dissolving ratio,36.4%,was obtained at 170°C for 30 *** COD dissolving ratio was about 2.% at 170°*** organic carbon of treated sludge liquor was 1.98 and 2.73 g/L at 150°C and 170°C for 5 min,respectively.A biochemical methane potential(BMP) test of excess sludge and a mixture of primary and excess sludge demonstrated an increase in biogas *** total biogas from microwave treated mixture sludge increased by 12.9% to 2..2. over control after 30 days of *** production was 11.1% to 2..9% higher for excess sludge than for untreated *** VS removal ratios of mixture sludge and excess sludge were 12. and 11% higher,respectively,compared to the untreated sludge.

关键词： biogas recovery microwave heating sludge anaerobic digestion

Industry-Oriented Detection Method of PCBA Defects Using Semantic Segmentation Models

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1438-1446页

作者： yang Li Xiao wang Zhifan He Ze wang Ke Cheng Sanchuan Ding Yijing Fan Xiaotao Li Yawen Niu Shanpeng Xiao Zhenqi Hao Bin gao Huaqiang Wu Department of Internet of Things Technology and Application China Mobile Research InstituteBeijing 100053China beijing Advanced Innovation Center for Integrated Circuits the School of Integrated CircuitTsinghua UniversityBeijing 100084China SigmaStar Technology Limited Xiamen 361199China IEEE

Automated optical inspection(AOI)is a significant process in printed circuit board assembly(PCBA)production lines which aims to detect tiny defects in *** AOI equipment has several deficiencies including low throughput,large computation cost,high latency,and poor flexibility,which limits the efficiency of online PCBA *** this paper,a novel PCBA defect detection method based on a lightweight deep convolution neural network is *** this method,the semantic segmentation model is combined with a rule-based defect recognition algorithm to build up a defect detection *** improve the performance of the model,extensive real PCBA images are collected from production lines as *** optimization methods have been applied in the model according to production demand and enable integration in lightweight computing *** results show that the production line using our method realizes a throughput more than three times higher than traditional *** method can be integrated into a lightweight inference system and pro-mote the flexibility of *** proposed method builds up a general paradigm and excellent example for model design and optimization oriented towards industrial requirements.

关键词： Automated optical inspection(AOI) deep learning defect detection printed circuit board assembly(PCBA) semantic segmentation.

On 3D simulation of moving objects in a digital earth system

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2008年第S2期51卷 123-132页

作者： WENG JingNong1,WU Lun2.HUANG Jian1,wang yang1,{2. Xue1 & HU Bin1 1 college of Software,Beihang University,beijing 100191,china 2.Institute of Geographical Information System and Remote Sensing,Peking University,beijing 100871,china college of Software Beihang University Beijing 100191 China Institute of Geographical Information System and Remote Sensing Peking University Beijing 100871 China

"How do the rescue helicopters find out an optimized path to arrive at the site of a disaster as soon as possible?" or "How are the flight procedures over mountains and plateaus simulated?" and so *** this paper a script language on spatial moving objects is presented by abstracting 3D spatial moving objects' behavior when implementing moving objects simulation in 3D digital Earth scene,which is based on a platform of digital china named "chinaStar".The definition of this script language,its morphology and syntax,its compiling and mediate language generating,and the behavior and state control of spatial moving objects are discussed *** addition,the language's applications and implementation are also discussed.

关键词： Digital Earth chinaStar moving object script language

The earliest evidence for a microblade adaptation in the remote,high altitude regions of the Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

science china Earth sciences 2024年第5期67卷 1561-1573页

作者： Yingshuai JIN Xiaoling ZHANG Shejiang wang Junyi GE Wei HE Wa DA Yunyao TAN Ziyi yang Christopher MORGAN Xing {2. Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of SciencesBeijing 100044China University of the Chinese Academy of sciences Beijing 100049China Cultural Relics Conservation Institute of the Xizang Autonomous Region Lhasa 850000China Nagqu Culture and Tourism Bureau Nagqu 852000China University of Nevada Reno 89557USA

Microblade assemblages are among the most common prehistoric archaeological materials found on the Tibetan Plateau(TP)and are thought to indicate large scale migration to and settlement of the *** microblade sites,however,have been systematically excavated,especially in the remotest,highest-elevation regions of the *** timing of the large-scale arrival,spread,and permanent settlement of people on the TP therefore remains *** this paper,we report on a recently excavated site,Locality 3 of the Nwya Devu Site(ND3),located at 4600 meters above sea level(masl),near the shore of Ngoin Lake,on the interior *** analyses reveal a fairly typical microblade technological orientation and two types of microblade cores:wedge-shaped and semi-conical,which are similar to those found throughout North *** Optically Stimulated Luminescence(OSL)dating and AMS^(14)C dating,the age of ND3 ranges from 11 to 10 *** date range indicates ND3 is the oldest microblade site yet recorded in the remote,high-elevation regions of the TP and thus provides important information about when and how hunter-gatherers using microblades began exploiting the higher altitudes of the *** together,studies at ND3 and throughout the TP suggest that a microblade adaptation is associated with the first prolonged human occupation of the plateau and that microblades played a significant role in mediating the risks and facilitating the mobility necessary to permanently inhabit the TP.

关键词： The interior of Tibetan Plateau Nwya Devu locality 3 Microblade Early Holocene High altitude adaption

Distribution and fractionation mechanism of stable carbon isotope of coalbed methane

在线全文

学校读者我要写书评

暂无评论

science china Earth sciences 2006年第12期49卷 1252-1258页

作者： QIN Shengfei1, TANG Xiuyi2. SONG Yan1 & wang Hongyan3 1. Research Institute of Petroleum Exploration and Development, Petrochina,{2., china 2. Anhui science and Technology college, Huainan 2.2.00, china 3. Langfang Branch, Research Institute of Petroleum Exploration and Development, Petrochina, Langfang 065007, china 1. Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China 2. Anhui science and Technology college Huainan 232000 China 3. Langfang Branch Research Institute of Petroleum Exploration and Development PetroChina Langfang 065007 China

The stable carbon isotope values of coalbed methane range widely, and also are gener- ally lighter than that of gases in normal coal-formed gas fields with similar coal rank. There exists strong carbon isotope fractionation in coalbed methane and it makes the carbon isotope value lighter. The correlation between the carbon isotope value and Ro in coalbed methane is less obvious. The coaly source rock maturity cannot be judged by coalbed methane carbon isotope value. The carbon isotopes of coalbed methane become lighter in much different degree due to the hydrodynamics. The stronger the hydrodynamics is, the lighter the CBM carbon isotopic value becomes. Many previous investigations indicated that the desorption-diffusion effects make the carbon isotope value of coalbed methane lighter. However, the explanation has encountered many problems. The authors of this arti- cle suggest that the flowing groundwater dissolution to free methane in coal seams and the free methane exchange with absorbed one is the carbon isotope fractionation mechanism in coalbed methane. The flowing groundwater in coal can easily take more 13CH4 away from free gas and com- paratively leave more 12.H4. This will make 12.H4 density in free gas comparatively higher than that in absorbed gas. The remaining 12.H4 in free gas then exchanges with the adsorbed methane in coal matrix. Some absorbed 13CH4 can be replaced and become free gas. Some free 12.H4 can be ab- sorbed again into coal matrix and become absorbed gas. Part of the newly replaced 13CH4 in free gas will also be taken away by water, leaving preferentially more 12.H4. The remaining 12.H4 in free gas will exchange again with adsorbed methane in the coal matrix. These processes occur all the time. Through accumulative effect, the 12.H4 will be greatly concentrated in coal. Thus, the stable carbon isotope of coalbed methane becomes dramatically lighter. Through simulation experiment on wa- ter-dissolved methane, it had been proved that the f

关键词： coalbed methane,methane stable carbon isotope,fractionation mechanism,accumulative effect.

Enhanced electrocatalytic CO_(2.reduction to formic acid using nanocomposites of In_(2.O_(3)@C with graphene

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 5031-5039页

作者： Wenxiang Li Shuo gao Chuanruo yang Juntao yang Amjad Nisar Guolei Xiang Junsu Jin beijing Key Laboratory of Membrane science and Technology Beijing University of Chemical TechnologyBeijing 100029China Nanomaterials Research Group PDPINSTECHIslamabad 44000Pakistan Institute of Industrial Chemistry College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China

In_(2.O_(3)is an effective electrocatalyst to convert CO_(2.to formic acid(HCOOH),but its inherent poor electrical conductivity limits the efficient charge transfer during the ***,the tendency of In_(2.O_(3)particles to agglomerate during synthesis further limits the exposure of active *** we address these issues by leveraging the template effect of graphene oxide and employing InBDC as a self-sacrificing template for the pyrolysis synthesis of In_(2.O_(3)@*** resulting In_(2.O_(3)@C/rGO-600 material features In_(2.O_(3)@C nanocubes uniformly anchored on a support of reduced graphene oxide(rGO),significantly enhancing the active sites *** conductive rGO network facilitates charge transfer during electrocatalysis,and the presence of oxygen vacancies generated during pyrolysis,combined with the strong electron-donating ability of rGO,enhances the adsorption and activation of CO_(2..In performance evaluation,In_(2.O_(3)@C/rGO-600 exhibits a remarkable HCOOH Faradaic efficiency exceeding 94.0%over a broad potential window of−0.7 to−1.0 V(*** hydrogen electrode(RHE)),with the highest value of 97.9%at−0.9 V(***)in a ***,the material demonstrates an excellent cathodic energy efficiency of 71.6%at−0.7 V(***).The study underscores the efficacy of uniformly anchoring metal oxide nanoparticles onto rGO for enhancing the electrocatalytic CO_(2.reduction performance of materials.

关键词： In_(2.O_(3)@C nanocomposite electrochemical CO_(2.reduction reduced graphene oxide oxygen vacancy

Curve fitting and optimal interpolation on CNC machines based on quadratic B-splines

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

science china(Information sciences) 2011年第7期54卷 1407-1418页

作者： ZHANG Mei 1,YAN Wei 2.YUAN ChunMing 1,wang DingKang 1 & gao XiaoShan 1 1 Key Laboratory of Mathematics Mechanization,Academy of Mathematics and Systems {2.,Chinese Academy of {2.s,beijing 100190,china 2.Research Institute of Petroleum Exploration and Development,beijing 100083,china 1. Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China2. Research Institute of Petroleum Exploration and Development Beijing 100083 China

In this paper,curve fitting of 3-D points generated by G01 codes and interpolation based on quadratic B-splines are *** points of G01 codes are selected using an adaptive ***,quadratic B-splines are obtained as the fitting curve by interpolating these feature *** required in implementing the velocity planning algorithm mentioned by Timer et *** very complicated because of the appearance of high-order *** improved time-optimal method for the quadratic B-spline curves is presented to circumvent this *** algorithms are verified with simulations as well as on real CNC machines.

关键词： quadratic B-spline G01 codes feature point velocity planning interpolation