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关键词

中国近30 多年的地震预报统计 1

事件树 1

人工智能;统计;人机协作 1

准噶尔盆地 1

地震 1

地震预测 1

太湖流域 1

平原水网 1

建筑火灾 1

控制 1

效果评估 1

数理统计 1

无人机;泊松点过程;多点协同;干扰统计特性;覆盖性能 1

春光油田 1

森林蓄积量 1

概率 1

模糊综合评判 1

沙湾组 1

油气勘探 1

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An emerging market for groundwater remediation in China: Policies, statistics, and future outlook

Deyi Hou, Guanghe Li, Paul Nathanail

《环境科学与工程前沿(英文)》 2018年 第12卷 第1期 doi: 10.1007/s11783-018-1027-x

摘要: There is a rapidly emerging and potentially huge market for the remediation of contaminated groundwater in China. The Chinese government published a Water Action Plan in April 2015, a Soil Action Plan in May 2016, and a draft Soil Pollution Prevention and Control Law in June 2017. All of these new policies and regulations put pressures on local governments and contaminated site owners, obliging them to conduct site investigation and to cleanup contaminated groundwater. The Chinese population in northern regions heavily depend on groundwater, with nearly 70% of water supply coming from aquifer sources in the Beijing-Tianjin-Hebei region. However, poor groundwater quality due to natural geochemical background and anthropogeic pollution is a serious concern, with poor or very poor quality water observed in nearly 80% of groundwater monitoring wells in 17 northern provinces. Shallow groundwater in many areas has been contaminated by toxic pollutants such as heavy metals and chlorinated organic compounds. There is an urgent need to better understand the situation and to conduct groundwater remediation at contaminated sites. The Chinese government is investing heavily in the research and development for groundwater remediation, which is expected to greatly add to the quality and quantity of groundwater remediation projects in the near future.

关键词: Groundwater pollution     Contaminated land     Groundwater remediation     Emerging market    

Anovel approach of noise statistics estimate using H∞ filter in target tracking

Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG

《信息与电子工程前沿(英文)》 2016年 第17卷 第5期   页码 449-457 doi: 10.1631/FITEE.1500262

摘要: Noise statistics are essential for estimation performance. In practical situations, however, a priori information of noise statistics is often imperfect. Previous work on noise statistics identification in linear systems still requires initial prior knowledge of the noise. A novel approach is presented in this paper to solve this paradox. First, we apply the H∞ filter to obtain the system state estimates without the common assumptions about the noise in conventional adaptive filters. Then by applying state estimates obtained from the H∞ filter, better estimates of the noise mean and covariance can be achieved, which can improve the performance of estimation. The proposed approach makes the best use of the system knowledge without a priori information with modest computation cost, which makes it possible to be applied online. Finally, numerical examples are presented to show the efficiency of this approach.

关键词: Noise estimate     H∞     filter     Target tracking    

模糊综合评判与数理统计知识结合的目标识别效果评估

李彦鹏,黎湘,王宏强,庄钊文

《中国工程科学》 2005年 第7卷 第3期   页码 64-68

摘要:

针对目标识别效果评估,利用数理统计知识确立了评估指标及测度方法。随后,使用模糊综合评判建立了一种开放的评估模型,该模型可以给出客观的、定量化的评估结果。最后,结合实测数据完成了仿真。

关键词: 数理统计     模糊综合评判     目标识别     效果评估    

An investigation on patient dose in screen-film diagnostic radiology in Lhasa City, Xizang Autonomous Region, China

null

《医学前沿(英文)》 2013年 第7卷 第4期   页码 506-509 doi: 10.1007/s11684-013-0294-y

摘要:

This study aimed to investigate patient dose in diagnostic screen-film radiographic examinations in the city of Lhasa, China. Seven out of the twenty-six hospitals registered with the Lhasa Health Bureau were included in the investigation. The entrance surface air Kerma (ESAK) of seven conventional screen-film radiology X-ray equipment in these hospitals was measured with a QA dosimeter in September 2012. The X-ray examinations were divided into three categories: PA (posterior-anterior) chest, upper/lower limb, and AP (anterior-posterior) lumbar spine. For each category, ESAKs were calculated and analyzed. The mean ESAK was 0.6 mGy for PA chest, 0.3 mGy for upper/lower limb, and 1.8 mGy for AP lumbar spine. In addition, the mean ESAK value recorded for PA chest X-ray examinations exceeded the corresponding value recommended by the International Atomic Energy Agency (0.4 mGy).

关键词: radiation dosage     radiology     radiation protection     radiography/statistics & numerical data    

Probabilistic model for vessel-bridge collisions in the Three Gorges Reservoir

Bo GENG , Hong WANG , Junjie WANG ,

《结构与土木工程前沿(英文)》 2009年 第3卷 第3期   页码 279-285 doi: 10.1007/s11709-009-0044-z

摘要: Based on a field observation on vessel transit path of three bridges over the Yangtze River in the Three Gorges Reservoir, and an analysis of the geometric probabilistic model of transiting vessels in collision probability calculation, the aberrancy angle and vessel velocity probabilistic model related with impact force, a probabilistic model is established and also verified by goodness-of-fit test. The vessel transit path distribution can be expressed by the normal distribution model. For the Three Gorges Reservoir, the mean and standard deviation adopt 0.2 and 0.1, respectively ( is the channel width). The aberrancy angle distribution of vessels accepts maximum I distribution model, and its distribution parameters can be taken as 0.314 and 4.354. The velocity distribution of up-bound and down-bound vessels can also be expressed by the normal distribution model.

关键词: vessel-bridge collision     probabilistic model     parameter statistics    

人工智能与统计分析 Perspective

Bin YU, Karl KUMBIER

《信息与电子工程前沿(英文)》 2018年 第19卷 第1期   页码 6-9 doi: 10.1631/FITEE.1700813

摘要: 人工智能(artificial intelligence, AI)本质上是由数据驱动的。在其通过人机协作完成数据生成、算法开发与结果评估的任务中,需要应用许多统计概念。本文讨论了如何通过数据产生、兴趣问题探究、训练数据代表性和对结果审视等环节(Population, Question of interest, Representativeness of training data, Scrutiny of results, PQRS)来解决人机协作的问题。PQRS的工作流程为融合统计分析的思想与人类输入提供了一个概念框架。这些统计分析的思想包括通过随机化、局部控制以及稳定性的原则来获得算法和结果的可重复性与可解释性。我们讨论了这些原则在自动驾驶、自动医疗以及作者其他合作研究中的应用。

关键词: 人工智能;统计;人机协作    

Availability of wind energy resource potential for power generation at Jos, Nigeria

O. O. Ajayi, R. O. Fagbenle, J. Katende, J. O. Okeniyi

《能源前沿(英文)》 2011年 第5卷 第4期   页码 376-385 doi: 10.1007/s11708-011-0167-5

摘要: The objective of this study was to assess the potential viability of the wind resource potential in Jos, Plateau state, Nigeria for power generation. The monthly mean wind speeds that span from 1987 to 2007 were employed to statistically analyze the monthly, annual and seasonal potentials of the wind energy resources at the site. Besides, the results were employed together with two models of wind energy conversion system to simulate the likely average output power. The outcome showed that Jos was suitable as a site for wind farm projects of varying sizes and that MW·h to GW·h of electricity is likely to be produced per period of months, seasons and years. The average wind speed range at the site was also estimated to be between 6.7 and 11.8 m/s across the months, years and seasons.

关键词: green electricity     renewable resources     Weibull statistics     Jos     Nigeria    

我国地震预测成绩的回顾与统计

高建国

《中国工程科学》 2009年 第11卷 第6期   页码 129-131

摘要:

地震预测预报的难度大,但并非了无痕迹或不可知,我国每次较大的地震都有案例总结。统计表明,近40 年来,有77 次地震在发生前均有中期、短期甚至临震预测,不能因为汶川地震预测的失败,就全面抹杀中国的地震预报成绩,即我国的地震预测成绩是应予肯定的,汶川地震也并非是无前兆的“怪震”。

关键词: 地震     地震预测     中国近30 多年的地震预报统计    

Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping combustion

Xiuning HUA,Wei WANG,Feng WANG

《环境科学与工程前沿(英文)》 2015年 第9卷 第6期   页码 1130-1138 doi: 10.1007/s11783-015-0821-y

摘要: Chemical looping combustion is a promising technology for energy conversion due to its low-carbon, high-efficiency, and environmental-friendly feature. A vital issue for CLC process is the development of oxygen carrier, since it must have sufficient reactivity. The mechanism and kinetics of CO reduction on iron-based oxygen carriers namely pure Fe O and Fe O supported by alumina (Fe O /Al O ) were investigated using thermo-gravimetric analysis. Fe O /Al O showed better reactivity over bare Fe O toward CO reduction. This was well supported by the observed higher rate constant for Fe O /Al O over pure Fe O with respective activation energy of 41.1±2.0 and 33.3±0.8 kJ·mol . The proposed models were compared via statistical approach comprising Akaike information criterion with correction coupled with F-test. The phase-boundary reaction and diffusion control models approximated to 95% confidence level along with scanning electron microscopy results; revealed the promising reduction reactions of pure Fe O and Fe O /Al O . The boosting recital of iron-based oxygen carrier support toward efficient chemical looping combustion could be explained accurately through the present study.

关键词: chemical looping combustion     iron-based oxygen carriers     reduction kinetics     carbon monoxide     statistics    

基于火灾动力学和概率统计理论耦合的建筑火灾直接损失预估

褚冠全,孙金华

《中国工程科学》 2004年 第6卷 第8期   页码 64-68

摘要:

以火灾成长概率和火灾发生后的过火面积为评价指标,探讨对建筑火灾过火面积的预估方法。依据火灾动力学和火灾发展过程中不同阶段的特点,将火灾由初期发展蔓延到整个防火分区的过程划分为4个阶段,采用概率论和事件树的分析方法,得到了每个阶段的火灾成长概率。根据不同阶段火灾的特点,求得了各阶段火灾的临界时间,并以此为基础对火灾发生后建筑物平均过火面积进行了预估。

关键词: 建筑火灾     火灾风险评估     事件树     概率     过火面积    

太湖流域平原水网区面源污染现状与控制对策

秦忠,耿清蔚,臧贵敏

《中国工程科学》 2010年 第12卷 第6期   页码 113-116

摘要:

通过对2005年与2000年入河污染物总量的分析表明,点源在入河污染物总量中的占比逐年下降,面源的占比迅速增加,尤其是TP(总磷) 入河量已经超过点源;面源污染呈“总量持平,结构调整”态势; 面源污染物总量构成中,农村居民生活位居第一,其次是水产养殖、水田径流等。在面源污染成因分析基础上,相应提出了太湖流域平原水网区面源污染控制的对策建议。

关键词: 太湖流域     平原水网     面源污染     控制    

沙湾组油气地质特征与勘探实践

刘传虎,王学忠

《中国工程科学》 2011年 第13卷 第4期   页码 87-95

摘要:

准噶尔盆地沙湾组以岩性油气藏为主,存在油砂体规模较小、油层薄、储层岩性变化快等勘探难题。2005年,排2井在沙湾组钻遇油层,日产油49.6 t,地面原油粘度为1.6 mPa·s。立足实践、大胆开拓促成了沙湾组浅层、稀油、高产岩性油藏的突破,高精度三维地震技术发挥了关键作用。车排子地区具有多油源输导、多层系含油、多类型富集、多品位共存的复式聚集特点和“三层楼”油气成藏模式。沙湾组轻质油藏油砂体形态与振幅属性具有较好的对应关系,能够通过地震属性有效识别油水边界。稀油油浸为含油性下限,粉细砂岩为岩性下限,渗透率0.022 μm2 、孔隙度 20 %为物性下限,油层声波时差大于 300 μs/m,电阻率大于1.5 Ω· m,电阻增大率大于 5.5。 已发现沙湾组油藏 23 个。

关键词: 沙湾组     油气成藏模式     油气勘探     石油地质特征     统计规律     准噶尔盆地     春光油田    

森林资源遥感估测的重要进展

赵宪文,李崇贵,斯林,田永林,袁凯先

《中国工程科学》 2001年 第3卷 第8期   页码 15-24

摘要:

传统的森林资源调查是一项费时、费力,需大量经费的工作。20世纪70年代末,遥感技术被引入中国。以中国林科院为主的一批林业科学工作者,积极将其应用于森林资源调查工作,特别是森林蓄积量的估测。研究了比值项的作用,确定用定量因子和定性因子联合估测森林蓄积量多元估计方程的形式,以及在中国不同气候带的应用。指出遥感调查方法比传统方法节约经费1/3~1/2。

近年来,用近代统计学和非参数方法进行了新的探索和深入研究,解决了一些在林业资源调查中应用遥感技术的重要问题,为建立以遥感技术为主要技术手段的新的森林资源估测体系提供有力支持。

关键词: 遥感调查     非参数估计     森林蓄积量     近代统计学    

多点协同传输机制下的多层无人机—地面异构网络覆盖性能分析 Research Article

王维昊,蒋逸凡,费泽松,郭婧

《信息与电子工程前沿(英文)》 2022年 第23卷 第1期   页码 61-72 doi: 10.1631/FITEE.2100310

摘要: 为满足第六代移动通信的泛在连接需求,无人机作为未来通信网络主要组成部分发挥着关键作用。频谱共享和视距链路传输造成的干扰是无人机通信的一个主要问题。近年来,为减少无人机—地面异构网络干扰,提出多点协同传输技术。本文提出一个三维多层无人机—地面异构网络,其中无人机作为空中基站部署于不同高度。利用随机几何理论,提出一个易于处理的数学框架评估这个异构网络的干扰统计特性和覆盖概率。数值结果表明多点协同传输机制能有效缓解网络中的干扰,尤其当基站密度较大时。此外,部署在更高的空中基站的系统参数是影响所提三维异构网络覆盖性能的主要因素。

关键词: 无人机;泊松点过程;多点协同;干扰统计特性;覆盖性能    

标题 作者 时间 类型 操作

An emerging market for groundwater remediation in China: Policies, statistics, and future outlook

Deyi Hou, Guanghe Li, Paul Nathanail

期刊论文

Anovel approach of noise statistics estimate using H∞ filter in target tracking

Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG

期刊论文

模糊综合评判与数理统计知识结合的目标识别效果评估

李彦鹏,黎湘,王宏强,庄钊文

期刊论文

An investigation on patient dose in screen-film diagnostic radiology in Lhasa City, Xizang Autonomous Region, China

null

期刊论文

Probabilistic model for vessel-bridge collisions in the Three Gorges Reservoir

Bo GENG , Hong WANG , Junjie WANG ,

期刊论文

人工智能与统计分析

Bin YU, Karl KUMBIER

期刊论文

Availability of wind energy resource potential for power generation at Jos, Nigeria

O. O. Ajayi, R. O. Fagbenle, J. Katende, J. O. Okeniyi

期刊论文

我国地震预测成绩的回顾与统计

高建国

期刊论文

Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping combustion

Xiuning HUA,Wei WANG,Feng WANG

期刊论文

基于火灾动力学和概率统计理论耦合的建筑火灾直接损失预估

褚冠全,孙金华

期刊论文

太湖流域平原水网区面源污染现状与控制对策

秦忠,耿清蔚,臧贵敏

期刊论文

沙湾组油气地质特征与勘探实践

刘传虎,王学忠

期刊论文

森林资源遥感估测的重要进展

赵宪文,李崇贵,斯林,田永林,袁凯先

期刊论文

多点协同传输机制下的多层无人机—地面异构网络覆盖性能分析

王维昊,蒋逸凡,费泽松,郭婧

期刊论文