THE outbreak of violence in April between the largely segregated Zwai and Tabu tribes in Libya＇s remote, Saharan town of Kufra shattered the uneasy calm that held since last February＇s clashes, resulting in more tha...THE outbreak of violence in April between the largely segregated Zwai and Tabu tribes in Libya＇s remote, Saharan town of Kufra shattered the uneasy calm that held since last February＇s clashes, resulting in more than 100 deaths. The clashes illustrate the chal- lenges in building a new state.展开更多
In order to select the long-acting,low toxic,low-risk and multi-functional new pesticides for the control of sugarcane borders and woolly aphids and precise and efficient application technology,the control effect of 1...In order to select the long-acting,low toxic,low-risk and multi-functional new pesticides for the control of sugarcane borders and woolly aphids and precise and efficient application technology,the control effect of 10% monosultap · thiamethoxam granular formulation and 1% Bt · clothianidin granular formulation on sugarcane borders and woolly aphids were studied.The results showed that 10% monosultap·thiamethoxam GR and 1% Bt·clothianidin GR had good control effects on sugarcane borders and woolly aphids.They were ideal slow-release,long-acting,low toxic and multi-functional new pesticides used to control sugarcane borders and woolly aphids.They could be used alternately with other pesticides to delay the emergence and development of pest resistance to pesticides.The best dosage of the two pesticides in the field was 45 kg/hm^2.They could be mixed with fertilizer( 1200-1800 kg/hm^2),scattered in sugarcane ditches or at the base of sugarcane plants,and covered with soil or film from January to July.The control effect on dead heart seedlings damaged by borers could be up to above 79.2%,and the control effect on sugarcane woolly aphids could reach more than 98.8%.In comparison with the control group,the actual yield and sugar content of sugarcane increased by above 41 555 kg/hm^2 and 6.5% respectively.The application of slow-release,long-acting,strong systemic and multi-functional new agents with fertilizer around roots is convenient,precise and efficient,labor-saving,time-saving and environmentally friendly,and is worthy of being widely applied in sugarcane areas.展开更多
The special geography and human environment of the Qinghai-Tibet Plateau has created the unique hydrochemical characteristics of the region’s natural water,which has been preserved in a largely natural state.However,...The special geography and human environment of the Qinghai-Tibet Plateau has created the unique hydrochemical characteristics of the region’s natural water,which has been preserved in a largely natural state.However,as the intensity of anthropogenic activities in the region has continued to increase,the water environment and hydrochemical characteristics of the Qinghai-Tibet Plateau have altered.In this study,water samples from the western,southern,and northeastern border areas of the Qinghai-Tibet Plateau,where human activities are ongoing,were collected,analyzed,and measured.The regional differences and factors controlling them were also investigated.The key results were obtained as follows.(1) Differences in the physical properties and hydrochemical characteristics,and their controlling factors,occurred in the different boundary areas of the Qinghai-Tibet Plateau.These differences were mainly the consequence of the geographical environment and geological conditions.(2) The water quality was good and suitable for drinking,with most samples meeting GB (Chinese national) and WHO (World Health Organization) drinking water standards.(3) The chemical properties of water were mainly controlled by the weathering of carbonates and the dissolution of evaporative rocks,with the former the most influential.(4) The biological quality indicators of natural water in the border areas were far superior to GB and WHO drinking water standards.展开更多
智慧边境建设是保障中国边境安全、维系国家地缘安全和实现可持续发展的核心议题。以web of science为数据源,利用Cite Space解析智慧边境研究特征及国外研究进展,并展望未来研究方向。结果表明:智慧边境研究尚处于起步阶段,发文数量呈...智慧边境建设是保障中国边境安全、维系国家地缘安全和实现可持续发展的核心议题。以web of science为数据源,利用Cite Space解析智慧边境研究特征及国外研究进展,并展望未来研究方向。结果表明:智慧边境研究尚处于起步阶段,发文数量呈波动上升趋势,但研究关注度较低。智慧边境研究群体分布分散,仅存在少量合作关系,尚未形成紧密的合作性作者网络,美国、英国、中国、加拿大、德国是研究智慧边境较多的国家。边境安全是智慧边境研究最关注的话题,移民管理和智能监控是智慧边境建设的重点。智慧边境研究主要围绕智慧边境内涵、智慧边境需求、智慧边境系统、预警机制构建、再边境化与智慧化和边境战略与跨境合作6个议题展开。未来,智慧边境研究应深化智慧边境理论与方法创新,开展中国智慧边境管控体系构建,加强通道精准管控与预警研究,探究多主体联动与人性化治理模式。展开更多
文摘THE outbreak of violence in April between the largely segregated Zwai and Tabu tribes in Libya＇s remote, Saharan town of Kufra shattered the uneasy calm that held since last February＇s clashes, resulting in more than 100 deaths. The clashes illustrate the chal- lenges in building a new state.
基金Supported by Sugar Crop Research System(CARS-170303)Training Project of"Yunling Industry Technology Leading Talent"(2018LJRC56)Special Funds for Construction of Modern Agricultural Industrial Technology System of Yunnan Province(YNGZTX-4-92)
文摘In order to select the long-acting,low toxic,low-risk and multi-functional new pesticides for the control of sugarcane borders and woolly aphids and precise and efficient application technology,the control effect of 10% monosultap · thiamethoxam granular formulation and 1% Bt · clothianidin granular formulation on sugarcane borders and woolly aphids were studied.The results showed that 10% monosultap·thiamethoxam GR and 1% Bt·clothianidin GR had good control effects on sugarcane borders and woolly aphids.They were ideal slow-release,long-acting,low toxic and multi-functional new pesticides used to control sugarcane borders and woolly aphids.They could be used alternately with other pesticides to delay the emergence and development of pest resistance to pesticides.The best dosage of the two pesticides in the field was 45 kg/hm^2.They could be mixed with fertilizer( 1200-1800 kg/hm^2),scattered in sugarcane ditches or at the base of sugarcane plants,and covered with soil or film from January to July.The control effect on dead heart seedlings damaged by borers could be up to above 79.2%,and the control effect on sugarcane woolly aphids could reach more than 98.8%.In comparison with the control group,the actual yield and sugar content of sugarcane increased by above 41 555 kg/hm^2 and 6.5% respectively.The application of slow-release,long-acting,strong systemic and multi-functional new agents with fertilizer around roots is convenient,precise and efficient,labor-saving,time-saving and environmentally friendly,and is worthy of being widely applied in sugarcane areas.
基金Key R&D and Transformation Program of Tibet,No.XZ201901NB08Major Science and Technology Project of Tibet,No.XZ201901NA03,No.XZ201801NA02
文摘The special geography and human environment of the Qinghai-Tibet Plateau has created the unique hydrochemical characteristics of the region’s natural water,which has been preserved in a largely natural state.However,as the intensity of anthropogenic activities in the region has continued to increase,the water environment and hydrochemical characteristics of the Qinghai-Tibet Plateau have altered.In this study,water samples from the western,southern,and northeastern border areas of the Qinghai-Tibet Plateau,where human activities are ongoing,were collected,analyzed,and measured.The regional differences and factors controlling them were also investigated.The key results were obtained as follows.(1) Differences in the physical properties and hydrochemical characteristics,and their controlling factors,occurred in the different boundary areas of the Qinghai-Tibet Plateau.These differences were mainly the consequence of the geographical environment and geological conditions.(2) The water quality was good and suitable for drinking,with most samples meeting GB (Chinese national) and WHO (World Health Organization) drinking water standards.(3) The chemical properties of water were mainly controlled by the weathering of carbonates and the dissolution of evaporative rocks,with the former the most influential.(4) The biological quality indicators of natural water in the border areas were far superior to GB and WHO drinking water standards.
文摘智慧边境建设是保障中国边境安全、维系国家地缘安全和实现可持续发展的核心议题。以web of science为数据源,利用Cite Space解析智慧边境研究特征及国外研究进展,并展望未来研究方向。结果表明:智慧边境研究尚处于起步阶段,发文数量呈波动上升趋势,但研究关注度较低。智慧边境研究群体分布分散,仅存在少量合作关系,尚未形成紧密的合作性作者网络,美国、英国、中国、加拿大、德国是研究智慧边境较多的国家。边境安全是智慧边境研究最关注的话题,移民管理和智能监控是智慧边境建设的重点。智慧边境研究主要围绕智慧边境内涵、智慧边境需求、智慧边境系统、预警机制构建、再边境化与智慧化和边境战略与跨境合作6个议题展开。未来,智慧边境研究应深化智慧边境理论与方法创新,开展中国智慧边境管控体系构建,加强通道精准管控与预警研究,探究多主体联动与人性化治理模式。
