Results 31 to 40 of about 1,435,259 (250)
Gongye shui chuli, 2002 混合二元酸是环己烷氧化制己二酸生产过程中的副产品, 其中含有丁二酸、戊二酸、己二酸等组分, 其组成复杂, 尽管价格便宜, 但分离成本高, 不经过分离进行综合利用受到很大的限制。实验不但成功地分别以戊二酸、己二酸为原料合成出新型的同碳二膦酸, 而且根据多组分缓蚀阻垢剂的协同效应原理, 采用组成复杂的混合二元酸一步合成出混合多元膦酸。对纯二元酸合成的产品和混合二元酸合成的产品缓蚀阻垢性能进行了比较。实验结果表明 ...
傅承碧
doaj
微波辐射I_2/Al_2O_3催化合成腈类化合物 [PDF]
, 2008 微波辐射下,I2/Al2O3催化芳香醛和盐酸羟氨的无溶剂反应,一锅法合成了腈类化合物,产率80%～99%
黄青春 +4 more
core
Perceived costs as drivers of wildlife management preferences in rural Tanzanian communities
Conservation Biology, EarlyView.Abstract Effectively managing human–wildlife interactions is crucial for fostering coexistence on shared landscapes. Management options are most effective when aligned with the preferences of people directly affected by wildlife, yet little is known about how socioecological factors influence these preferences.
Christian Kiffner +10 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2017 【目的】比较超声（US）与计算机断层扫描（CT）或磁共振（MR）的融合成像（US-CT/MR融合成像）以及超声与三 维超声融合（US-US融合成像）在联合其他手术或操作的肝肿瘤消融术中疗效评估应用的价值。【方法】本研究纳入2015年 8月至2015年12月期间联合其他手术或操作（包括开腹手术、腹腔镜手术、人工胸腹水等）的肝肿瘤消融治疗患者，分别对 同一患者采用US-CT/MR融合成像和US-US融合成像结合超声造影进行术中即时消融疗效评估，比较两种融合成像技术适 用率、融合配准成功率及操作时间 ...
龙颖琳 +5 more
doaj
Regulatory compliance and support for altered management of the exotic pet trade
Conservation Biology, EarlyView.Abstract Globally, the exotic pet trade has contributed to species invasion, disease, and animal welfare risks. Although scientists have advocated for increased trade regulation, the success of management and regulatory efforts depends on compliance by participants in the exotic pet trade. We used a regulatory compliance framework to investigate exotic
Elizabeth N. Pratt +3 more
wiley +1 more source
Using customs data to understand overlooked trade in non‐CITES birds between Africa and Asia
Conservation Biology, EarlyView.Abstract The international trade in live birds poses risks to animals, people, and biodiversity. To effectively mitigate these risks, decision‐makers require information on the volume, dynamics, and direction of trade. Despite Africa once being the largest exporter of birds by region, very little data exist on recent trade in live birds not listed on ...
Alisa Davies +4 more
wiley +1 more source
四川大学学报. 自然科学版, 1991 讨论了连续汉语语音合成中的问题,介绍了采用线性预测方法,用专用语音合成芯片TMSs220实现实时连续汉语语音合成的原理和方法,同时以11个语音合成试验句和二字词组为例,进行了合成试验,得到了满意的结果。
苟大举 +3 more
doaj
, 2011 本发明属于有机化学领域，涉及多取代氢化萘化合物、其合成方法及用途，具体涉及手性的多取代十氢或/和八氢萘化合物及其合成方法和用途。本发明的目的是：提供手性的多取代十氢或/和八氢萘化合物，并采用齐墩果烷型或乌苏烷型五环三萜类化合物作为原料制备该化合物，本发明的多取代十氢或/和八氢萘化合物用于合成含有多氢萘结构片段的药物或者香料以及它们的类似物。本发明方法简单易行，成本低，产率高 ...
张国林, 杨海君
core
Evaluating synthetic substitutes to reduce illegal harvesting and support species recovery
Conservation Biology, EarlyView.Abstract Providing synthetic substitutes is a widely promoted strategy to shift consumer demand away from wildlife products derived from threatened species. Yet, there is little evidence on whether product substitution prevents illegal or unsustainable harvesting and contributes to the recovery of threatened populations.
Aditya Shekhar Malgaonkar +17 more
wiley +1 more source