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白菜网棚繁种蜜蜂授粉试验 被引量:3
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作者 赵利民 杜学曾 柯桂兰 《北方园艺》 CAS 北大核心 2001年第4期49-49,共1页
关键词 白菜 棚繁 蜜蜂授粉 子产量 子质量
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中国叉齿细蜂属网腰细蜂种团二新种记述(膜翅目:细蜂科) 被引量:1
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作者 刘经贤 何俊华 许再福 《Entomotaxonomia》 CSCD 北大核心 2006年第2期139-144,共6页
记录我国叉齿细蜂属Exallonyx叉齿细蜂亚属Exallonyx网腰细蜂种团dictyotus-group2新种:采自陕西和浙江的黑唇叉齿细蜂Exallonyxnigrolabius,sp.nov.和采自贵州的短脊叉齿细蜂Exallonyxbrevicarinus,sp.nov.。模式标本保存于浙江大学寄... 记录我国叉齿细蜂属Exallonyx叉齿细蜂亚属Exallonyx网腰细蜂种团dictyotus-group2新种:采自陕西和浙江的黑唇叉齿细蜂Exallonyxnigrolabius,sp.nov.和采自贵州的短脊叉齿细蜂Exallonyxbrevicarinus,sp.nov.。模式标本保存于浙江大学寄生蜂标本室。 展开更多
关键词 膜翅目 细蜂科 叉齿细蜂属 腰细蜂 中国
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异种网络互联在RISC6000和VAX4200机之间的应用
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作者 张志檩 魏西宁 《电子技术应用》 北大核心 1995年第7期29-29,45,共2页
介绍拓扑结构不同的网络进行物理连接与逻辑连接的技术.
关键词 路径 互连 计算机
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异种网互连的设计与实现 被引量:1
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作者 夏学知 杨警 徐海樵 《计算机工程与应用》 CSCD 北大核心 1998年第1期19-21,共3页
本文介绍了1553B网与以太网间的互联网关的方案设计与工程实现技术。首先分析了网关的基本功能和设计需求,分析了1553B网与以太网的协议差异,确定了网关的设计方案,解决了实现二者互联的关键技术——寻址技术,信息格式转... 本文介绍了1553B网与以太网间的互联网关的方案设计与工程实现技术。首先分析了网关的基本功能和设计需求,分析了1553B网与以太网的协议差异,确定了网关的设计方案,解决了实现二者互联的关键技术——寻址技术,信息格式转换技术和流控制技术。 展开更多
关键词 1553B 络互连 计算机 寻址
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Prolinx-4604网关实现异种工业控制网的互联 被引量:1
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作者 黄河洵 《工业控制计算机》 2003年第11期12-13,16,共3页
本文描述了DH+,profibus总线协议的原理及特点,分析了连接两种异构网络的网关设备prolinx-4604的工作原理及配置过程,列举了用该网关连接两种网络的工程实例。
关键词 工业控制 Prolin-4604 工业局域协议 现场总线
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水平圆盘排种系统可靠性预测与评估方法 被引量:4
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作者 廖庆喜 舒彩霞 《农机化研究》 北大核心 2003年第3期73-74,共2页
针对水平圆盘精密排种器排种系统的特点,提出了排种系统的功能逻辑框图、可靠性框图和故障树,分析了排种系统可靠性预测与评估的方法。
关键词 水平盘精密排 系统 可靠性 预测 评估方法 功能逻辑框图 可靠性框图 故障树
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计算机分炉型、钢种锭坯材平衡软件分析系统的开发及应用
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作者 张琳 王明浩 +2 位作者 雷红 韩建新 刘建忠 《经济师》 2000年第8期200-200,215,共2页
关键词 炉型 网种 锭坯材 平衡软件分析系统 开发 应用
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A new species in the genus Chorthippus Fieber,1852(Orthoptera:Arcypteridae) from Sichuan Province 被引量:2
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作者 印象初 郑方强 叶保华 《Entomotaxonomia》 CSCD 北大核心 2012年第4期594-598,共5页
A new species, Chorthippus (Altichorthippus) choui sp. nov. from Sichuan Province in China, is described in this paper. The new species is similar to Chorthippus (Altichorthippus) changtunensis Yin, 1984, but it d... A new species, Chorthippus (Altichorthippus) choui sp. nov. from Sichuan Province in China, is described in this paper. The new species is similar to Chorthippus (Altichorthippus) changtunensis Yin, 1984, but it differs from the latter by: hind femur and tibia orange red, abdomen of male orange red at end and medial area of tegmen is 1.2 times cubital area. The new species is also similar to Ch. (Altichorthippus) tibetanus Uvarov, 1935, but differs from the latter by the lateral carinae of pronotum obvious and angulated in prozona, anterior and posterior transverse carinae not obliterated. 展开更多
关键词 ORTHOPTERA ARCYPTERIDAE CHORTHIPPUS new species China
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A new species in the genus Saxetophilus Umnov(Orthoptera:Arcypteridae) from Qinghai,China 被引量:3
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作者 郑哲民 陈振宁 林立亮 《Entomotaxonomia》 CSCD 北大核心 2012年第1期13-16,共4页
Abstract: In this present paper, one new species in the genus Saxetophilus Umnov from Qinghai Province, Saxetophilus qinghaiensis sp. nov., is described. This new species is allied to Saxetophilus gansuensis Wang et ... Abstract: In this present paper, one new species in the genus Saxetophilus Umnov from Qinghai Province, Saxetophilus qinghaiensis sp. nov., is described. This new species is allied to Saxetophilus gansuensis Wang et al., 2006 and Saxetophilus mistshenkoi Naumovitsh, 1988. It differs from both of them in: l) widest between lateral keels of pronotum by 3.30-3.75 times (~) or 3.00-3.60 times (~) length of median keel in metazona; and 2) interspace of mesosternal lobes wider than that of lateral lobes. Type specimens are at the Institute of Zoology, Shaanxi Normal University. 展开更多
关键词 ORTHOPTERA ARCYPTERIDAE Saxetophilus new species China
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A new species in the genus Chorthippus(Orthoptera:Arcypteridae) from western Xinjiang,China 被引量:1
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作者 王延峰 郑哲民 《Entomotaxonomia》 CSCD 北大核心 2012年第2期127-130,共4页
In this paper, a new species of Chorthippus xinyuanensis sp. nov. (Orthoptera: Arcypteridae) is described from Xinyuan County, west of Xinjiang, China. The new species is allied to Ch. foveatus Xia et Jin, 1982 and... In this paper, a new species of Chorthippus xinyuanensis sp. nov. (Orthoptera: Arcypteridae) is described from Xinyuan County, west of Xinjiang, China. The new species is allied to Ch. foveatus Xia et Jin, 1982 and Ch. longicornis (Latreille), 1804. The type specimens are deposited in the Institute of Zoology, Shaanxi Normal University. 展开更多
关键词 ORTHOPTERA ARCYPTERIDAE CHORTHIPPUS new species China
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A new species in the subgenus Chorthippus(Altichorthippus)(Orthoptera:Arcypteridae) from Xinjiang,China 被引量:1
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作者 王延峰 郑哲民 《Entomotaxonomia》 CSCD 北大核心 2012年第2期131-136,共6页
A new species Chorthippus (Altichorthippus) guozigouensis sp. nov. is described from the Xinjiang Uygur Autonomous Region of China. The new species is similar to Ch. (Altichorthippus) charpini Chang, 1939 and Ch. ... A new species Chorthippus (Altichorthippus) guozigouensis sp. nov. is described from the Xinjiang Uygur Autonomous Region of China. The new species is similar to Ch. (Altichorthippus) charpini Chang, 1939 and Ch. (Altiehorthippus)jishishanensis Zheng & Xie, 2000, but males differ from both as follows.. length of fastigial foveolae about 3.00 times its width; antennae just not reaching the base of hind femur; apex of elytron extending to the posterior margin of seventh abdominal tergum; widest of costal area 0.67 times widest medial area; apex of hind wing extending to the middle of seventh abdominal tergum; anterior and posterior cubitus connate, cubital area obliterated; cercus reaching middle of epiproct; knee lobe brownish, not black; basal part of hind tibia brownish, not black. The type specimens are deposited in the Institute of Zoology, Shaanxi Normal University. 展开更多
关键词 ORTHOPTERA ARCYPTERIDAE CHORTHIPPUS new species China
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Genus Lepturga Stl (Hemiptera: Tingidae) from China with Description of a New Species
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作者 李传仁 《Entomotaxonomia》 CSCD 北大核心 2007年第2期127-130,共4页
Two species of the genus Lepturga Stal are recorded from China, they are Lepturga chinai Takeya, 1962 and Lepturga gyirongensis Li, sp. nov.. The shared morphological characters and differences between Lepturga Steal ... Two species of the genus Lepturga Stal are recorded from China, they are Lepturga chinai Takeya, 1962 and Lepturga gyirongensis Li, sp. nov.. The shared morphological characters and differences between Lepturga Steal and Collinutius Distant are discussed. All type specimens are deposited in the Institute of Zoology, Chinese Academy of Science, Beijing. 展开更多
关键词 HEMIPTERA TINGIDAE Lepturga new species China
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A New Species of the Genus Chorthippus (Orthoptera: Arcypteridae) from North of Shaanxi, China 被引量:1
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作者 王延峰 郑哲民 《Entomotaxonomia》 CSCD 北大核心 2006年第1期17-20,共4页
In this paper, a new species of the genus Chorthippus is described from North of Shaanxi Province, China, namely: Chorthippus wuqiensis sp. nov. The type specimens are deposited in the Institute of Zoology, Shaanxi N... In this paper, a new species of the genus Chorthippus is described from North of Shaanxi Province, China, namely: Chorthippus wuqiensis sp. nov. The type specimens are deposited in the Institute of Zoology, Shaanxi Normal University. 展开更多
关键词 Onhoptera ACRIDOIDEA ARCYPTERIDAE CHORTHIPPUS new species North of Shaanxi Province China
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A New Genus and a New Species of Grasshoppers from Jiangsu Province (Orthopters:Arcypteridae)
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作者 印红 张道川 李新江 《Zoological Research》 CAS CSCD 北大核心 2002年第4期319-322,共4页
The paper reports a new genus of Arcypteridae i e. Suacris gen.nov.and a new species Suacris siyangensis sp.nov.The new genus is similar to Omocestus I Bol ,but differs from the latter in:① Lateral car... The paper reports a new genus of Arcypteridae i e. Suacris gen.nov.and a new species Suacris siyangensis sp.nov.The new genus is similar to Omocestus I Bol ,but differs from the latter in:① Lateral carinae slightly curved,widest 1 6-1 8 times greater than narrowest.② Cubital area wider than or equal to medial area.③Tympanum organ distinct,♂ widely oval,♀ crevice like.The new genus is also similar to Stenobothroides Xu et Zheng,but differs from the later in:①Lateral carinae obvious and curve.②Tergum of terminal abdomere without furcula.③Male subgenital plate long conica.Type specimens are deposited in Northwest Plateau Institute of Biology,the Chinese Academy of Sciences. 展开更多
关键词 ORTHOPTERA ARCYPTERIDAE New genus New species China
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A new species in the genus Chorthippus(Orthoptera:Arcypteridae) from northwest of Xinjiang Uygur Autonomous Region of China
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作者 王延峰 郑哲民 《Entomotaxonomia》 CSCD 北大核心 2012年第1期8-12,共5页
Abstract: In this paper, a new species of Chorthippus wenquanensis sp. nov. (Orthoptera: Arcypteridae) is described from the Northwest of Xinjiang Uygur Autonomous Region of China. The new species is allied to C. ... Abstract: In this paper, a new species of Chorthippus wenquanensis sp. nov. (Orthoptera: Arcypteridae) is described from the Northwest of Xinjiang Uygur Autonomous Region of China. The new species is allied to C. rufitibialus Zheng, Ma & Wang 1996. It differs from the latter in male as follows: longitudinal diameter of eye 1.8-1.9 times subocular furrow; widest of pronotum between lateral carinae 2.0 times narrowest; arolium between claws small, slightly not reaching half length of claws; basal part of hind tibia yellowish brown, not black; claws pale blue in basal part. The type specimens are deposited in the Institute of Zoology, Shaanxi Normal University. 展开更多
关键词 ORTHOPTERA ARCYPTERIDAE CHORTHIPPUS new species China
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Prediction of resilient modulus for subgrade soils based on ANN approach 被引量:4
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作者 ZHANG Jun-hui HU Jian-kun +2 位作者 PENG Jun-hui FAN Hai-shan ZHOU Chao 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第3期898-910,共13页
The resilient modulus(MR)of subgrade soils is usually used to characterize the stiffness of subgrade and is a crucial parameter in pavement design.In order to determine the resilient modulus of compacted subgrade soil... The resilient modulus(MR)of subgrade soils is usually used to characterize the stiffness of subgrade and is a crucial parameter in pavement design.In order to determine the resilient modulus of compacted subgrade soils quickly and accurately,an optimized artificial neural network(ANN)approach based on the multi-population genetic algorithm(MPGA)was proposed in this study.The MPGA overcomes the problems of the traditional ANN such as low efficiency,local optimum and over-fitting.The developed optimized ANN method consists of ten input variables,twenty-one hidden neurons,and one output variable.The physical properties(liquid limit,plastic limit,plasticity index,0.075 mm passing percentage,maximum dry density,optimum moisture content),state variables(degree of compaction,moisture content)and stress variables(confining pressure,deviatoric stress)of subgrade soils were selected as input variables.The MR was directly used as the output variable.Then,adopting a large amount of experimental data from existing literature,the developed optimized ANN method was compared with the existing representative estimation methods.The results show that the developed optimized ANN method has the advantages of fast speed,strong generalization ability and good accuracy in MR estimation. 展开更多
关键词 resilient modulus subgrade soils artificial neural network multi-population genetic algorithm prediction method
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The Control Effect of Prevention and Control Technology Combination against Southern Rice Black-Streaked Dwarf Disease
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作者 陈琳 周友 +7 位作者 彭伟卓 刘秀 黄彩萍 金晨钟 刘佳佳 李静波 邓亚男 覃梦 《Agricultural Science & Technology》 CAS 2015年第6期1233-1236,共4页
Objective] This study aimed to explore a better prevention and control technology combination against southern rice black-streaked dwarf disease. [Method] The control effects of seed dressing, antiviral agents and fly... Objective] This study aimed to explore a better prevention and control technology combination against southern rice black-streaked dwarf disease. [Method] The control effects of seed dressing, antiviral agents and fly net along with 25%pymetrozine against southern rice black streaked dwarf disease were determined. [Result] When the seeds were dressed with 60% imidacloprid (FS, 2 g a.i./kg), and the rice seedlings were sprayed once with 25% pymetrozine (WP, 360 g/hm2) 10 d before the transplanting and sprayed twice with 30% Dufulin (WP, 800×) at three-leaf stage and 7 d after the transplanting respectively, the control efficiency reached 88.05%. When fly net and pesticides were applied simultaneously, the fly net was lifted and 25% pymetrozine (WP) was spayed once on the rice seedlings at six-leaf stage and the seedlings were hardened for 3 d and sprayed once with 25%pymetrozine (WP) 10 d after the transplanting, the control efficiency reached 80.50%. [Conclusion] Seed dressing or applying antiviral agents alone can not better control diseases. The southern rice black-streaked dwarf disease can be better con-trol ed by seed dressing, along with spraying of planthopper-kil ing agents at two-leaf stage, 3 d before the transplanting and 7 d after the transplanting, respectively. If condition al ow, fly net can be instal ed to achieve better control effect. 展开更多
关键词 Southern rice black-streaked dwarf disease PLANTHOPPER AGENTS Seed dressing Fly net
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TCP/IP中的层次结构思想的探讨 被引量:2
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作者 岳甫兵 《安徽教育学院学报》 2003年第3期33-34,共2页
TCP/ IP拥有一整套总体结构和协议标准 ,它的设计和实现中体现的层次结构思想和方法 ,对于整个计算机科学与工程领域具有普遍的指导意义 ,本文从 TCP/ IP运用层次结构解决实际问题的思想 ,探讨了TCP/ IP层次结构的特点以及适用于层次结... TCP/ IP拥有一整套总体结构和协议标准 ,它的设计和实现中体现的层次结构思想和方法 ,对于整个计算机科学与工程领域具有普遍的指导意义 ,本文从 TCP/ IP运用层次结构解决实际问题的思想 ,探讨了TCP/ IP层次结构的特点以及适用于层次结构的应用模型。 展开更多
关键词 TCP/IP 层次结构思想 资源共享 数据处理 络协议 计算机
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Breeding of a New High-yield, High-oil and Web Blotch-resistant Big Peanut Variety Shanghua 511
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作者 吴继华 王红军 +3 位作者 李可 陈雷 范小玉 关红英 《Agricultural Science & Technology》 CAS 2017年第8期1403-1405,共3页
Shanghua 511 is a high-yield, high-oil and web blotch-resistant big peanut variety bred by the Shangqiu Academy of Agriculture and Forestry Sciences through sexual hybridization (Yuhua 18♀×Shangyan 9658♂). In... Shanghua 511 is a high-yield, high-oil and web blotch-resistant big peanut variety bred by the Shangqiu Academy of Agriculture and Forestry Sciences through sexual hybridization (Yuhua 18♀×Shangyan 9658♂). In the wheat-peanut interplanting regional experiment conducted in Henan Province during 2012-2013, the average pod and seed yield of Shanghua 511 were 5906.19 and 4149.3 kg/hm2, respectively. In the wheat-peanut interplanting production experiment conducted in Henan Province in 2013, the average pod and seed yield of Shanghua 511 were 6036.45 and 4309.50 kg/hm2, respectively. In the kernels of Shanghua 511, the contents of crude fat, oleic acid and linoleic acid were 56.62%, 44.9% and 33.4% respectively, and the oleic/linoleic acid ratio was 1.34. This variety had high resistance to web blotch and medium resistance to leaf spot, viral diseases, root rot and collar rot. The 100-pod weight, 100-kernel weight, shelling percentage and growth period of Shanghua 511 were 270.6, 110.9 g, 70.6% and 120 d, respectively. Shanghua 511 passed the approval of Henan Provincial Crop Variety Approval Committee in August, 2015, and is suitable for spring sowing and wheat interplanting in the surrounding area of Henan Province and the area to the north of Huaihe River. 展开更多
关键词 High yield High oil Web blotch resistance Peanut variety Shanghua511 BREEDING
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Evaluating Conservation Effectiveness of Nature Reserves Established for Surrogate Species:Case of a Giant Panda Nature Reserve in Qinling Mountains,China 被引量:12
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作者 XU Weihua Andrés VIA +4 位作者 QI Zengxiang OUYANG Zhiyun LIU Jianguo LIU Wei WAN Hui 《Chinese Geographical Science》 SCIE CSCD 2014年第1期60-70,共11页
Many nature reserves are established to protect the habitat needs of particular endangered species of interest but their effectiveness for protecting other species is questionable.In this study,this effectiveness was ... Many nature reserves are established to protect the habitat needs of particular endangered species of interest but their effectiveness for protecting other species is questionable.In this study,this effectiveness was evaluated in a nature reserve network located in the Qinling Mountains,Shaanxi Province,China.The network of reserves was established mainly for the conservation of the giant panda,a species considered as a surrogate for the conservation of many other endangered species in the region.The habitat suitability of nine protected species,including the giant panda,was modeled by using Maximum Entropy(MAXENT)and their spatial congruence was analyzed.Habitat suitability of these species was also overlapped with nature reserve boundaries and their management zones(i.e.,core,buffer and experimental zones).Results show that in general the habitat of the giant panda constitutes a reasonable surrogate of the habitat of other protected species,and giant panda reserves protect a relatively high proportion of the habitat of other protected species.Therefore,giant panda habitat conservation also allows the conservation of the habitat of other protected species in the region.However,a large area of suitable habitat was excluded from the nature reserve network.In addition,four species exhibited a low proportion of highly suitable habitat inside the core zones of nature reserves.It suggests that a high proportion of suitable habitat of protected species not targeted for conservation is located in the experimental and buffer zones,thus,is being affected by human activities.To increase their conservation effectiveness,nature reserves and their management zones need to be re-examined in order to include suitable habitat of more endangered species.The procedures described in this study can be easily implemented for the conservation of many endangered species not only in China but in many other parts of the world. 展开更多
关键词 giant panda habitat suitability Maximum Entropy(MAXENT) nature reserve network surrogate species
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