检索结果-南通市图书馆

Rules of variation in hydrogen during reignition of underground fire zones of spontaneous coal combustion

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2010年第4期20卷 499-503页

作者： ZHOU Fubao li jinhai liU Yusheng SHAO He School of Safety Engineering China University of Mining ＆ Technology Xuzhou 221008 ChinaState Key Laboratory of Coal Resources and Safe Mining China University of Mining ＆ Technology Xuzhou 221008 China

In light of the possibility of reignition when unsealing the closed fire zones, the occurrence of reignition was simulated by a home-made experimental device, hydrogen variety rule from combustion to unsealing was analyzed, the three-stage generation model of hydrogen during reignition in fire zone was put forward and the probability that hydrogen was taken as an indicator gas was discussed. The results show that: when fire zone is ready to unseal, which is filled with hydrogen at a high concentration, it is more prone to reignite.

关键词： unsealing fire zone reignition hydrogen generation model indicator gas

Design and experimental validation of improved grapevine burying machine

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2018年第2期11卷 95-100页

作者： Shuming Yang Huiyan She Shuchuan Yang Xuejun Zhu Yun Chen jinhai li Maoqiang li School of Mechanical Engineering Ningxia UniversityYinchuan 750021China

In order to address the low soil breaking rate,poor soil covering performance,and low working efficiency of the existing 3MT-1.8 and PMT-75 grapevine burying machines,two types of improved burying machines,namely the 3MTLJ-1.8 and 3MTXP-1.8,were developed in consideration of the local Ningxia soil *** experimental results indicated that the soil breaking rate of the 3MTLJ-1.8 machine was 71.44%,and its soil sampling volume increased by approximately 30%compared to that of the 3MT-1.8 *** was verified that the self-developed 3MTLJ-1.8 machine can be used in the southern regions of ***,the soil sampling volume of the 3MTXP-1.8 burying machine was 0.24 m^(3)/m,and its soil breaking rate increased by more than 41.42%compared to the standard required *** 3MTXP-1.8 machine can be used in the northern areas of Ningxia,where the soil hardness is *** results can provide a reference for the development and popularization of grapevine burying machines in Ningxia.

关键词： grapevine burying machine improvement soil sampling performance soil covering performance soil breaking rate

A computer code for beam optics calculation--third order approximation

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

Progress in Natural Science:Materials International 2006年第6期16卷 667-670页

作者： Lü Jianqin and li jinhai (Institute of Heavy Ion Physics, Peking University, Beijing 100871, China) [a]Institure of Heavy Ion Physics Peking University Beijing China

To calculate the beam transport in the ion optical systems accurately, a beam dynamics computer program of third order approximation is developed. Many conventional optical elements are incorporated in the program. Particle distributions of uniform type or Gaussian type in the (x, y, z) 3D ellipses can be selected by the users. The optimization procedures are provided to make the calculations reasonable and fast. The calculated results can be graphically displayed on the computer monitor.

关键词： beam transport computer program third order approximation lie algebra.

CNPC’s Overseas Projects Maintain Stable Operation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Oil & Gas 2020年第1期27卷 20-23页

作者： liu liang li jinhai 不详

Since the outbreak of the novel coronavirus,CNPC’s international business operations have started acampaign of epidemic prevention and control,and importance has been attached to both production and epidemic prevention and control *** present,overseas on-the-job employees and staff on leave back in China are in good *** and operations of overseas projects are safe and *** of February 20,CNPC's overseas oil and gas businesses have produced a total of14.71 million tons of equivalent equity production of oil and gas in 2020,which amounts to 101%of the scheduled yield or 14.13%of the annual *** them,the equity production of crude oil reaches 11.0689 million tons,and that of natural gas is 4.575 billion cubic meters,which are 100.7%and 103.0%of the scheduled yield respectively.

关键词： CNPC operations prevention

Tactics Study of Implementing IE in the Manufacturing

在线全文

学校读者我要写书评

暂无评论

河北工业大学学报 1997年第A1期26卷 76-80页

作者： li jinhai li Jie Zhang Min

Today’s complex business environments with new markets and shmp competition demand that manufacturers underStand quickly customer ***, improve *** the same time, many innovations take place in the technology and managemenL On the basis of these innovations, IE is developed and perfected constantly. The paper points out the developing tendency of IE. How do the enterprise implement IE, especially manufacturing in China.

关键词： Productivity IE

Two modifications of GNSS receiver system in simulation with Matlab

在线全文

学校读者我要写书评

暂无评论

Two modifications of GNSS receiver system in simulation with...

Incoherent digital holographic spectral imaging with high accuracy of image pixel registration

2013年教育技术与管理科学国际会议

作者： Sichao li Yuepeng Yan jinhai li Dept. of Electronics System Tech. Institute of Microelectronics of CAS

Simulation with Matlab is a basic method in design of GNSS(global navigation satellite system) receiver. Based on the theoretic analysis of spreading code generator and carrier generator in GNSS, this paper proposed modified generators of both code and carrier in Matlab after considering the characteristic of Matlab. Under the condition of different cycles of spreading code and carrier, the modified generating methods had been tested. The results show that, compared with traditional ones, the speed of modified spreading code generator raises by more than 50 times, and the speed of modified carrier generator raises by more than 110 times.

关键词： receiver of GNSS simulation with Matlab running time spreading code generator carrier generator

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第4期30卷 240-246页

作者： Feng-Ying Ma Xi Wang Yuan-Zhuang Bu Yong-Zhi Tian Yanli Du Qiao-Xia Gong Ceyun Zhuang jinhai li Lei li School of Physics and Microelectronics Key Laboratory of Materials Physics of the Ministry of EducationZhengzhou UniversityZhengzhou 450001China School of Mechanical Engineering Zhengzhou UniversityZhengzhou 450001China

Fresnel incoherent correlation holography(FINCH) is a unique three-dimensional(3D) imaging technique which has the advantages of scanning-free,high resolution,and easy matching with existing mature optical *** this article,an incoherent digital holographic spectral imaging method with high accuracy of spectral reconstruction based on liquid crystal tunable filter(LCTF) and FINCH is *** the programmable characteristics of spatial light modulator(SLM),a series of phase masks,none of whose focal lengths changes with wavelength,is designed and *** each wavelength of LCTF output,SLM calls three phase masks with different phase constants at the corresponding wavelength,and CCD records three *** spectral images obtained by this method have a constant magnification,which can achieve pixel-level image registration,restrain image registration errors,and improve spectral reconstruction *** results show that this method can not only obtain the 3D spatial information and spectral information of the object simultaneously,but also have high accuracy of spectral reconstruction and excellent color reproducibility.

关键词： incoherent digital holography high-precision registration spectral imaging microspectral imaging

Construction of Forecast and Early Warning System of Meteorological and Geological Disasters in Qinghai Province

在线全文

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2022年第3期13卷 49-55页

作者： Qingping li Qin GUAN Aijuan BAI jinhai li Yujun ZHU Qinghai Provincial Key Laboratory of Disaster Prevention and Mitigation Xining 811300China Huangnanzhou Meteorological Bureau Tongren 811300China Qinghai Provincial Meteorological Observatory Xining 831100China Chengdu University of Information Engineering Chengdu 210025China

Based on the meteorological and geological disaster data, ground observation data set, CLDAS grid point data set, and EC, BJ and other model product data during 2008-2020, the temporal and spatial distribution characteristics of meteorological and geological disasters and precipitation were analyzed, and the causes of the occurrence of meteorological geological disasters and the deviation of model precipitation forecast were revealed. Besides, an objective precipitation forecast system and a forecast and early warning system of meteorological and geological disasters were established. The results show that meteorological and geological disasters and precipitation were mainly concentrated from May to October, of which continuous precipitation appeared frequently in June and September, and convective precipitation was mainly distributed in July-August;the occurrence frequency of meteorological and geological disasters was basically consistent with the distribution of accumulated precipitation and short-term heavy precipitation, and they were mainly concentrated in the southern and eastern parts of Qinghai. Meteorological and geological disasters were basically caused by heavy rain and above, and meteorological and geological disasters were divided into three types: continuous precipitation(type I), short-term heavy precipitation(type II) and mixed precipitation(type III). For type I, the early warning conditions of meteorological and geological disasters in Qinghai are as follows: if the soil volumetric water content difference between 0-10 and 10-40 cm is ≤0.03 mm^(3)/mm^(3), or the soil volumetric water content at one of the depths is ≥0.25 mm^(3)/mm^(3), the future effective precipitation reaches 8.4 mm in 1 h, 10.2 mm in 2 h, 11.5 mm in 3 h, 14.2 mm in 6 h, 17.7 mm in 12 h, and 18.2 mm in 24 h, and such warning conditions are mainly used in Yushu, Guoluo, southern Hainan, southern Huangnan and other places. For type II, when the future effective precipitation is u

关键词： Meteorological and geological disasters Precipitation threshold Soil volumetric water content Continuous precipitation Short-term heavy precipitation Forecast and early warning

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

航姿参考系统中一种自适应卡尔曼滤波算法

西安电子科技大学学报 2011年第6期38卷 103-107,122页

作者：田易孙金海李金海阎跃鹏中国科学院微电子研究所北京100029

在航姿参考系统测量载体姿态的过程中,由于观测噪声不确定,严重影响了常规卡尔曼滤波结果的精度.另外,当系统受到干扰而使观测噪声突然改变时,甚至会导致滤波发散.提出一种航姿参考系统自适应卡尔曼滤波算法,能够根据观测数据来自适应... 详细信息

在航姿参考系统测量载体姿态的过程中,由于观测噪声不确定,严重影响了常规卡尔曼滤波结果的精度.另外,当系统受到干扰而使观测噪声突然改变时,甚至会导致滤波发散.提出一种航姿参考系统自适应卡尔曼滤波算法,能够根据观测数据来自适应调整观测噪声,从而提高卡尔曼滤波精度,改善系统的鲁棒性.仿真表明,当观测噪声时变时,常规卡尔曼滤波结果明显发散,而新自适应卡尔曼滤波结果收敛良好,在系统计算复杂度没有明显增加的前提下,系统的稳定性得到了明显提高.

关键词：航姿参考系统自适应滤波卡尔曼滤波模糊控制