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苏云金芽胞杆菌G033A大面积防治二代区亚洲玉米螟效果评价 被引量:5
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作者 赵秀梅 郑旭 +6 位作者 王连霞 刘颖 刘洋 王立达 李青超 韩业辉 王振营 《中国生物防治学报》 CSCD 北大核心 2022年第1期166-171,共6页
亚洲玉米螟Ostrinia furnacalis (Guenée)是黑龙江省玉米生产上发生最重、为害最大的常发性害虫,为明确苏云金芽胞杆菌G033A(Bt G033A)对2代区亚洲玉米螟的田间防效,分别于玉米心叶期和穗期,应用BtG033A对1代和2代亚洲玉米螟进行... 亚洲玉米螟Ostrinia furnacalis (Guenée)是黑龙江省玉米生产上发生最重、为害最大的常发性害虫,为明确苏云金芽胞杆菌G033A(Bt G033A)对2代区亚洲玉米螟的田间防效,分别于玉米心叶期和穗期,应用BtG033A对1代和2代亚洲玉米螟进行了防治示范,测定田间平均防治效果、挽回产量损失率及产量。结果表明,Bt G033A在心叶期和穗期各防治1次(即分别防治1代及2代亚洲玉米螟低龄幼虫),平均防治效果达90.6%,挽回产量损失率为7.8%,显著高于心叶期及穗期仅防治1次(即只防治1代或只防治2代亚洲玉米螟幼虫)。因此,在亚洲玉米螟发生为害严重的2代区,可应用BtG033A于玉米心叶期和穗期各防治1次,可显著提高防治效果,减轻产量损失;亚洲玉米螟发生为害较轻的2代区或1代区,可应用Bt G033A于玉米心叶期防治1次。研究结果对2代区亚洲玉米螟的绿色防控具有重要应用价值。 展开更多
关键词 亚洲玉米螟 苏云金芽胞杆菌G033A 代区 防治效果
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黑龙江省二代区玉米螟生物防治技术模式效果 被引量:2
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作者 赵秀梅 王立达 +6 位作者 李青超 郑旭 王连霞 刘洋 刘悦 兰英 韩业辉 《农业科技通讯》 2022年第9期28-31,共4页
黑龙江省二代区玉米螟发生一般较重,对玉米的产量和品质造成了严重的威胁。2019-2020年,基于二代区玉米螟为害特点,优化集成二代区玉米螟生物防治技术模式。结果表明,天敌昆虫赤眼蜂寄生一代玉米螟卵,施用微生物源杀虫剂苏云金杆菌(Bt)... 黑龙江省二代区玉米螟发生一般较重,对玉米的产量和品质造成了严重的威胁。2019-2020年,基于二代区玉米螟为害特点,优化集成二代区玉米螟生物防治技术模式。结果表明,天敌昆虫赤眼蜂寄生一代玉米螟卵,施用微生物源杀虫剂苏云金杆菌(Bt)防治二代玉米螟低龄幼虫的生物防治技术模式对玉米螟的整体防治效果较好,平均防治效果为86.08%~88.43%,挽回玉米产量损失率7.78%~7.83%,亩纯增效益66.00~149.60元,投入产出比为1∶(6.37~11.84),有效地控制了玉米螟为害,减少了化学农药使用量,绿色环保、节本增效,对农产品质量及农业生态环境安全,经济、社会、生态效益均显著。 展开更多
关键词 玉米螟 生物防治 赤眼蜂 苏云金杆菌 黑龙江省二代区
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吉林省二代区亚洲玉米螟危害趋势研究 被引量:5
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作者 周淑香 鲁新 +3 位作者 李丽娟 张国红 丁岩 常雪 《应用昆虫学报》 CAS CSCD 北大核心 2014年第3期654-660,共7页
【目的】明确吉林省二代区亚洲玉米螟Ostriniafurnacalis(Guenee)发生趋势,为亚洲玉米螟的早期防治提供理论依据。【方法】2002—2013年采用田间调查的方法对吉林省二代区亚洲玉米螟的田间落卵量及为害趋势进行研究,同时分析田间落卵和... 【目的】明确吉林省二代区亚洲玉米螟Ostriniafurnacalis(Guenee)发生趋势,为亚洲玉米螟的早期防治提供理论依据。【方法】2002—2013年采用田间调查的方法对吉林省二代区亚洲玉米螟的田间落卵量及为害趋势进行研究,同时分析田间落卵和为害情况的关系。【结果】亚洲玉米螟1代卵始见期在6月14日左右,高峰期在6月25日左右,末期在7月15日左右;2代卵始见期在7月25日左右,高峰期在8月15日左右,末期在9月1日左右。1代落卵量呈整体下降趋势,2代落卵量呈整体增加趋势,两代之间微弱相关(r=-0.058,P=0.857)。百株虫孔数呈整体下降趋势,虫量和被害株率在年度间呈不规则波动,整体发生趋势12年间未发生明显变化。通过对亚洲玉米螟卵量和玉米受害情况进行相关分析和通径分析,表明亚洲玉米螟为害是两代共同作用的结果,1代落卵量对越冬虫量影响很小,秋季剖杆时玉米螟的越冬虫量主要由2代落卵量决定,但1代落卵量对秋季剖杆百株虫孔数和被害株率的贡献大于2代。【结论】1代玉米螟发生重,秋季收获时虫孔数较多;2代玉米螟发生重,秋季收获时虫量较大;玉米螟秋季剖杆百株虫孔数整体下降,但被害株率没有发生显著变化,说明2代玉米螟为害呈逐年加重趋势。 展开更多
关键词 亚洲玉米螟 发生趋势 玉米螟
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幻肢循经感传与幻肢外周功能代偿区的假想 被引量:1
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作者 朱建 《针灸临床杂志》 2007年第8期60-61,共2页
  循经感传是最常见的一种经络现象,系指使用针刺、艾灸或其它方法刺激穴位时产生的"得气"感从受刺激的穴位开始沿中医古典经脉路线传导的现象,循经感传的出现与经络实质有关.……
关键词 循经感传 幻肢感传 外周功能
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第三代新疆煤田火区无线监测系统的设计分析 被引量:3
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作者 包兴东 《能源与环保》 2017年第1期124-127,共4页
在对第二代新疆煤田火区无线监测系统的运行情况分析判断的基础上,结合各个传感器所采集的历史数据,得出了现有第二代新疆煤田火区无线监测系统的4点不足:1根据分析温度采集器(节点)能源不足;2数据库的数据处理故障;3监测功能单一;4监... 在对第二代新疆煤田火区无线监测系统的运行情况分析判断的基础上,结合各个传感器所采集的历史数据,得出了现有第二代新疆煤田火区无线监测系统的4点不足:1根据分析温度采集器(节点)能源不足;2数据库的数据处理故障;3监测功能单一;4监测系统的展示功能较为简单。针对这些不足,提出了相应的解决方案,并以该方案为基础设计出第三代新疆煤田火区无线监测系统,使新疆煤田火灾在测温、测气、大屏展示等功能方面更加完善、稳定、可靠,形成新的火灾监控模式。 展开更多
关键词 第三煤田火无线监测系统 采集器 火灾监控 新疆煤田
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合理配置伐区林道的研究 被引量:1
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作者 朴赞景 刘本锡 《南京林业大学学报(自然科学版)》 CAS CSCD 1993年第3期86-90,共5页
为开辟木材生产集约化经营的新途径,本文在大量调查与实际考察的基础上,以集运材总成本最低为原则,建立了适宜林道最佳间距和范围的理论公式,提出了伐区路网配置型式和方法,并利用最佳林道间距作为伐区林道的控制指标。
关键词 路网密度 路网配置 林道间距 代区
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论伐区生产与林业可持续发展
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作者 丛雪峰 《林业机械与木工设备》 1998年第5期9-10,共2页
论伐区生产与林业可持续发展(150232)黑龙江省山河屯林业局丛雪峰1前言伐区木材生产是森工产业平衡发展的重要组成部分,它包括伐区调查设计、准备作业、采伐作业、集材作业、归装作业和采伐迹地清理等内容。伐区生产是企业主... 论伐区生产与林业可持续发展(150232)黑龙江省山河屯林业局丛雪峰1前言伐区木材生产是森工产业平衡发展的重要组成部分,它包括伐区调查设计、准备作业、采伐作业、集材作业、归装作业和采伐迹地清理等内容。伐区生产是企业主要生产经营活动,是企业财力的主要来... 展开更多
关键词 代区 生产 林业 可持续发展
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贵州省典型铅锌矿区居民血液总汞和甲基汞暴露及健康风险模型预测评估 被引量:11
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作者 孔林 刘杰民 +6 位作者 韦艳 许志东 安仕刚 吴梅 刘刚 徐晓航 仇广乐 《环境科学研究》 EI CAS CSCD 北大核心 2021年第6期1499-1508,共10页
汞是铅锌矿石的常见伴生元素,铅锌冶炼活动会给当地居民带来潜在汞暴露风险.为了解铅锌矿区居民血液汞暴露及健康风险,选择贵州省赫章县为研究区域,以贵阳市为对照区,分别采集居民血液样品418和118份,利用冷原子荧光法测定其总汞和甲基... 汞是铅锌矿石的常见伴生元素,铅锌冶炼活动会给当地居民带来潜在汞暴露风险.为了解铅锌矿区居民血液汞暴露及健康风险,选择贵州省赫章县为研究区域,以贵阳市为对照区,分别采集居民血液样品418和118份,利用冷原子荧光法测定其总汞和甲基汞含量,结合年龄和性别分析血液总汞与甲基汞含量特征,估算育龄期妇女头发甲基汞含量并进行甲基汞暴露致新生儿IQ (智商)损失评估,利用单区室PBPK (生理药代动力学)模型预测居民甲基汞ADI (日均摄入量).结果表明:(1)铅锌矿区(赫章县)和对照区居民血液总汞含量几何均值分别为(3.11±5.05)和(1.83±1.19)μg/L,范围分别为0.63~54.26和0.46~11.88μg/L,分别有21.5%和0.85%的血液样本总汞含量超过人体血液总汞安全限值(5.8μg/L).(2)铅锌矿区成年居民和0~6岁儿童血液总汞含量分别为(2.80±3.85)和(2.49±2.08)μg/L,分别有77和7人血液总汞含量超过5.8μg/L,超标率分别为24.37%和10.61%,存在潜在总汞暴露风险.(3)斯皮尔曼相关性分析显示,铅锌矿区居民血液总汞和甲基汞含量分别与年龄(R=0.108,P<0.05)和性别(R=-0.185,P<0.05)相关,老年人较其他年龄段人群总汞暴露的风险更高,其血液总汞含量达(5.29±5.03)μg/L;男性血液甲基汞含量[(0.24±0.32)μg/L]高于女性[(0.18±0.22)μg/L].(4)蒙特卡洛模型模拟结果显示,铅锌矿区和对照区育龄妇女头发甲基汞平均含量分别为(0.07±0.11)和(0.11±0.13)mg/kg,范围分别为0~11.81和0~5.74 mg/kg,其中铅锌矿区2.27%的育龄期妇女头发甲基汞含量超过发汞临界值(0.58 mg/kg),导致IQ评分为70~70.18分范围内的约0.05%的婴儿从IQ正常转变为MMR (轻度智力低下).(5)单区室PBPK模型预测表明,铅锌矿区和对照区居民甲基汞日均摄入量分别为(0.005±0.006)和(0.007±0.008)μg/kg,分别有0.082%和0.013%的居民甲基汞日均摄入量超过RfD (参考剂量值,0.1μg/kg).研究显示:铅锌矿区成年居民和0~6岁儿童血液总汞含量高于国内其他地区,男性血液甲基汞含量明显高于女性;铅锌矿区约2.27%的育龄期妇女头发甲基汞含量超过发汞临界值,可致IQ评分在70~70.18分范围内的约0.05%的婴儿从智力正常转变为MMR;铅锌矿区居民甲基汞非致癌风险高于对照区. 展开更多
关键词 总汞和甲基汞 血液 智商损失 室PBPK(生理药动力学)模型 铅锌矿
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Pollen Assemblage Features of Modern Water Samples from the Shiyang River Drainage, Arid Region of China 被引量:7
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作者 朱艳 陈发虎 +2 位作者 程波 张家武 David B.MADSEN 《Acta Botanica Sinica》 CSCD 2002年第3期367-372,共6页
Pollen analysis of 30 modem water samples from the Shivang River, an internal river system located between the Tengger and Badain Jaran deserts, Northwest China was carried out to examine the river's capacity to c... Pollen analysis of 30 modem water samples from the Shivang River, an internal river system located between the Tengger and Badain Jaran deserts, Northwest China was carried out to examine the river's capacity to carry pollen and spores, and to assess the contribution of the water-borne pollen to pollen assemblages in lake sediments at the end of the river system. Results indicate the pollen assemblages in water samples consist of both local and upland pollen. Percentages of upland pollen reach 30% - 60%, and pollen assemblages in water samples do not indicate the nature of local vegetation at the sampling sites. Fluvial currents have the capacity to transport large quantities of pollen long distances, and the contribution of this fluvial transported pollen is relatively high, For example, percentages of Picea Dietr. pollen in water samples at sampling sites 130 km and 145 km away from Picea forests reach 16.5% and 7.7%, respectively. Fluvial pollen transport occurs primarily during flood periods, and pollen concentrations from the flood samples are 17.1 - 12.5 times those from normal fluvial flow. Reservoirs affect pollen transportation since pollen is deposited at reservoir inlets and pollen concentrations are much reduced at reservoir outlets. Human activity can thus change natural features of pollen transportation and deposition. The main factors influencing pollen concentrations and assemblages are sampling time, sampling location, and rainfall intensity. 展开更多
关键词 pollen analysis modern river water Shiyang River arid region of China
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Research on Beautiful Countryside Planning in Underdeveloped Areas from Perspective of Traditional and Modern Integration——a Case Study of Jiangjia Village, Jishui County, Jiangxi Province 被引量:2
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作者 李小云 胡思琦 《Agricultural Science & Technology》 CAS 2016年第6期1468-1470,共3页
In context of building beautiful countryside nationwide, underdeveloped areas are confronted by many problems, such as monotonous industry structure, simi- lar rural landscape and loss of characteristics. With a case ... In context of building beautiful countryside nationwide, underdeveloped areas are confronted by many problems, such as monotonous industry structure, simi- lar rural landscape and loss of characteristics. With a case of Jiangjia Village, Jishui County, Jiangxi Province, the research explored rural pattern, cultural characteristics, building style, development value and potential and analyzed regional cooperation, urban-rural integration, and planning first, from the perspectives of economy, culture and building in order to protect traditional economy and highlight local characteristics. 展开更多
关键词 Tradition and modern INTEGRATION Underdeveloped areas Beautiful Countryside
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Several Fossil Woods from Mesozoic of Western Liaoning Province, Northeast, China 被引量:19
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作者 段淑英 《Acta Botanica Sinica》 CSCD 2000年第2期207-213,共7页
The author described some new species and genera of the fossil woods from Mesozoic of Western Liaoning besides Xenoxylon latiporosum (Cramer) Gothan, X. hopeiense Chang, X. liaoningense Duan et Wang, X. yixia... The author described some new species and genera of the fossil woods from Mesozoic of Western Liaoning besides Xenoxylon latiporosum (Cramer) Gothan, X. hopeiense Chang, X. liaoningense Duan et Wang, X. yixianense Zhang et Shang, Protopiceoxylon yizhouense Duan et Cui. They are Protopiceoxylon chaoyangense Duan sp. nov., Araucarioxylon batuense Duan sp. nov., Taxoxylon liaoxiense Duan sp. nov. and an old species Araucarioxylon sidugawaense Shimakura. 展开更多
关键词 Protopiceoxylon Araucarioxylon Taxoxylon
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The Gaoyuzhuang Palaeobiology 被引量:1
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作者 徐兆良 阿拉米克S.M. 《Acta Botanica Sinica》 CSCD 2002年第5期617-627,共11页
Black bedded, nodular, and lenticular chert and silicified parts of stromatolites from the approximately 1 400 - 1 600 million year-old Gaoyuzhuang Formation, North China, contain remark-ably well prep served microflo... Black bedded, nodular, and lenticular chert and silicified parts of stromatolites from the approximately 1 400 - 1 600 million year-old Gaoyuzhuang Formation, North China, contain remark-ably well prep served microflora composed of diverse prokaryotic and possible eukaryotic microbes. Macroscopic algae have also been found. This Formation provides important paleobiological information from which to assess status of Mesoproterozoic life, and to evaluate paleoenvironmental conditions and pre-Phanerozoic biostratigraphy. The Gaoyuzhuang Formation has yielded over 100 taxa described by over 10 investigators. Most of the microbial taxa can be divided into three different assemblages according to their paleobiological and paleoenvironmental characteristics. I. The oscillatoriacean/chroococcacean assemblage which occurs in the first member of the Formation and this is interpreted to represent an assemblage from shallow water mat-building and mat-dwelling taxa with some possible planktonic taxa; 2. the nostocacean assemblage found only in the second member, and includes benthic mat-building or mat-dwelling taxa; and 3. the chroococcacean assemblage of the fourth member, which represents intertidal to supratidal mat-building and allochthonous taxa. Proterozoic microfossils found in chert, especially cyanobacteria, are possibly more valuable as paleoenvironmental indicators than as chronostratigraphic tools because of their morphological conservation, although trends in diversity appear to exist for cyanobacteria in the Proterozoic. The general characteristics of Gaoyuzhuang microfossils, and the fact that most nostocacean chains occur and are. preserved with the chain perpendicular to bedding indicate that: (1) the individual size of Gaoyuzhuang microfossils are part of a general trend of increase with time; (2) Gaoyuzhuang deposits are possibly in a fresh water environment and the rate of sedimentation might be equal to or less than the microbial growth rate; (3) the sedimentary model of Gaoyuzhuang might be from intertidal to subtidal or deep sea, and then to intertidal or supratidal; and (4) the eukaryotic organisms had densely occurred when Gaoyuzhuang Formation deposited. 展开更多
关键词 North China MESOPROTEROZOIC Gaoyuzhuang Formation PALAEOBIOLOGY
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Expression of Recombinant Tryptophan Decarboxylase in Different Subcellular Compartments in Tobacco Plant 被引量:2
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作者 王淼 李秋荣 +1 位作者 Stefano Di FIORE Rainer FISCHER 《Acta Botanica Sinica》 CSCD 2002年第3期314-317,共4页
The gene encoded for tryptophan decarboxylase (TDC), which is the key enzyme in terpenoil indole alkaloids pathway, was targeted to different subcellular compartments and stably expressed in transgenic tobacco (Nicoti... The gene encoded for tryptophan decarboxylase (TDC), which is the key enzyme in terpenoil indole alkaloids pathway, was targeted to different subcellular compartments and stably expressed in transgenic tobacco (Nicotiana tabacum L.) plants at the levels detected by Western blot and tryptamine accumulation analysis. It was shown that the TDC was located in subcellular compartments, the chloroplasts and cytosol. The recombinant TDC targeted to chloroplasts and cytosol in tobacco plants was effectively expressed as soluble protein by Western blot analysis and enzymatic assay. The level of tryptamine accumulation in chloroplast was higher than that in cytosol and very low in vacuole and endoplasmic reticulum (ER) to be hardly detected by Western blot analysis. It was indicated that the highest amount of tryptamine was in chloroplasts, lower in endoplasmic reticula and the lowest in vacuoles as compared to those in wild type plants. The TDC targeted to different subcellular compartments of tobacco plants and its expression level were studied by different nucleotide sequences coding signal peptides at 5'-end of tdc gene in order to know the effects of the TDC in compartmentation on its functionality. 展开更多
关键词 tryptophan decarboxylase alkaloids biosynthetic pathway Nicotiana tabacum subcellular compartment
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The extreme dry/wet events in northern China during recent 100 years 被引量:10
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作者 马柱国 丹利 胡跃文 《Journal of Geographical Sciences》 SCIE CSCD 2004年第3期275-281,共7页
Using monthly precipitation and monthly mean temperature, a surface humid index was proposed. According to the index, the distributed characteristics of extreme dryness has been fully analyzed. The results indicated t... Using monthly precipitation and monthly mean temperature, a surface humid index was proposed. According to the index, the distributed characteristics of extreme dryness has been fully analyzed. The results indicated that there is an obvious increasing trend of extreme dryness in the central part of northern China and northeastern China in the last 10 years, which shows a high frequency period of extreme dryness; while a low frequency period in the regions during the last 100 years. Compared with variation trend of the temperature in these regions, the region of high frequent extreme dryness is consistent with the warming trend in the same region. 展开更多
关键词 monthly precipitation air temperature surface humid index CLIMATE extremedryness
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Dynamic Evolvement of Agricultural System and Typical Patterns of Modern Agriculture in Coastal China:A Case of Suzhou 被引量:10
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作者 ZHAI Rongxin LIU Yansui 《Chinese Geographical Science》 SCIE CSCD 2009年第3期249-257,共9页
Based on dynamic theory of system, agriculture is a complex system composed by element, structure, function and development. Firstly, this paper analyzes their connotation and relationship, which could be simply descr... Based on dynamic theory of system, agriculture is a complex system composed by element, structure, function and development. Firstly, this paper analyzes their connotation and relationship, which could be simply described that in virtue of element integrating and structure optimizing, agricultural system may achieve multifunctionality to meet increasingly diverse demands. As a case study of Suzhou, it concludes that Suzhou has a LP-dependence on agricultural element, and the growth extent of agricultural productivity correlates to the ratio of agricultural labor reduc- ing rate to farmland reducing rate. Agricultural structure of Suzhou changed with time, and in the early 1980s and 2000s it was most notable. Correspondingly, agricultural function has experienced a succession process: 'production', 'production-living', and 'production-living-ecology'. At last, based on questionnaires and interviews, some new characteristics and problems of agricultural development in coastal developed region of China have been put forward. Meanwhile, some typical patterns of modern agriculture in Suzhou which adapt to system evolving are also brought up such as export-oriented agriculture, enterprises-leading agriculture, agricultural science and technology parks, characteristic and stereoscopic agriculture, tourism and sightseeing agriculture. 展开更多
关键词 modern agriculture agricultural system SUZHOU coastal China
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Holocene Climate Cycles in Northwest Margin of Asian Monsoon 被引量:1
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作者 LI Yu WANG Nai'ang +2 位作者 LI Zhuolun ZHOU Xuehua ZHANG Chengqi 《Chinese Geographical Science》 SCIE CSCD 2012年第4期450-461,共12页
In the mid-latitude regions of the Asian continent, Zhuye Lake is located in the northwest margin of the Asian monsoon, where the modem climate is affected by the Asian monsoon and Westerlies. In this study, we invest... In the mid-latitude regions of the Asian continent, Zhuye Lake is located in the northwest margin of the Asian monsoon, where the modem climate is affected by the Asian monsoon and Westerlies. In this study, we investi- gated the absolutely dated Holocene records in Zhuye Lake for detecting the Holocene climate cycles. Totally, 14 14C dates and 6 optically simulated luminescence (OSL) dates are obtained from the QTH01 and QTH02 sections. The proxies of grain-size, total organic carbon content (TOC), C/N and 813C are used for wavelet analysis, and the results show obvious -256, -512 and -1024-year climate cycles, which are consistent with the Holocene millennial and cen- tennial scale climate cycles in the typical Asian summer monsoon domain. In different parts of the Zhuye Lake, the Holocene sediments show variable climate cycles that are affected by the lake basin topography. In the Zhuye Lake, the Holocene climate cycles are mainly correlated with the solar-related Asian summer monsoon variability and the North Atlantic ice-rafting events. 展开更多
关键词 HOLOCENE climate cycle Asian monsoon wavelet analysis Zhuye Lake
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China’s Western Development Strategy for Modernization Drive 被引量:5
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作者 Yang Kaizhong 《China Economist》 2021年第3期62-83,共22页
The Western Development Strategy(WDS)is a key aspect of China’s coordinated regional development strategy and effort to build a modern country.The world is undergoing profound changes that have not been witnessed in ... The Western Development Strategy(WDS)is a key aspect of China’s coordinated regional development strategy and effort to build a modern country.The world is undergoing profound changes that have not been witnessed in a century.This paper discusses the WDS’s importance in regards to China’s modernization drive and the great rejuvenation of the Chinese nation.First,this paper identifies the WDS’s mission to improve people’s livelihood in China’s western regions,promote common prosperity for the Eurasian continent,and support the green transition of China’s and Eurasian energy economic and environmental systems,and safeguard ecological security in Asia at large.Second,this paper suggests that the key to the WDS is to reshape the geographical layout of economic activity in the western regions to avoid inefficiency.Specifically,China should develop a compact geographical layout of economic activity in the western regions,introduce a unique competition strategy,as well as find solutions for coordinated regional development based on key river basins.Finally,develop smart internet and inland free ports within the western regions. 展开更多
关键词 China modernized country coordinated regional development Western Development Strategy(WDS) spatial diseconomies
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Interdecadal Variability in Surface Solar Radiation over Northwest China and Its Possible Cause 被引量:1
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作者 ZHOU Lian-Tong 《Atmospheric and Oceanic Science Letters》 2011年第2期103-108,共6页
The present study investigates the interdecadal variability of seasonal mean surface solar radiation over Northwest China using station observations from 1961-2003. Spring and summer surface solar radiation over North... The present study investigates the interdecadal variability of seasonal mean surface solar radiation over Northwest China using station observations from 1961-2003. Spring and summer surface solar radiation over Northwest China was lower in the late 1970s through 1990s than in the 1960s through the mid-1970s, and fall and winter surface solar radiation displayed similar patterns. These results indicate that the decrease in spring and summer surface solar radiation may be associated with increased low-cloud cover over Northwest China. Rainfall anomalies were closely related to the low-cloud cover over Northwest China and with the Northern Hemisphere circumglobal teleconnection in spring, summer, and winter. 展开更多
关键词 surface solar radiation RAINFALL low-cloud cover circumglobal teleconnection
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Entropy of Partitions on Sequential Effect Algebras 被引量:1
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作者 汪加梅 武俊德 CHO Minhyun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第3期399-402,共4页
By using the sequential effect algebra theory, we establish the partitions and refinements of quantum logics and study their entropies.
关键词 sequential effect algebra Boolean algebra ENTROPY
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Rev Rec: A two-layer reviewer recommendation algorithm in pull-based development model 被引量:5
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作者 杨程 张迅晖 +5 位作者 曾令斌 范强 王涛 余跃 尹刚 王怀民 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第5期1129-1143,共15页
Code review is an important process to reduce code defects and improve software quality. In social coding communities like GitHub, as everyone can submit Pull-Requests, code review plays a more important role than eve... Code review is an important process to reduce code defects and improve software quality. In social coding communities like GitHub, as everyone can submit Pull-Requests, code review plays a more important role than ever before, and the process is quite time-consuming. Therefore, finding and recommending proper reviewers for the emerging Pull-Requests becomes a vital task. However, most of the current studies mainly focus on recommending reviewers by checking whether they will participate or not without differentiating the participation types. In this paper, we develop a two-layer reviewer recommendation model to recommend reviewers for Pull-Requests (PRs) in GitHub projects from the technical and managerial perspectives. For the first layer, we recommend suitable developers to review the target PRs based on a hybrid recommendation method. For the second layer, after getting the recommendation results from the first layer, we specify whether the target developer will technically or managerially participate in the reviewing process. We conducted experiments on two popular projects in GitHub, and tested the approach using PRs created between February 2016 and February 2017. The results show that the first layer of our recommendation model performs better than the previous work, and the second layer can effectively differentiate the types of participation. 展开更多
关键词 Pull-Request code reviewer recommendation GitHub open source community
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