Results 21 to 30 of about 54,165 (161)
, 2012 [目的]研究十字花科与豆科作物对微囊藻毒素(MC)耐受性的差异。[方法]以十字花科作物典型作物油菜、小白菜、甘蓝与豆科典型作物黄豆、豌豆、蚕豆为材料,检测它们在不同浓度MC暴露条件下的生长发育情况,检测指标包括发芽率、株高、叶绿素等。[结果]十字花科作物中油菜与小白菜受MC影响较大,甘蓝受影响较小,而豆科作物普遍受影不大。[结论]豆科作物比十字花科作物对MC耐受性更强 ...
刘剑彤, 刘碧波, 吴烨
core
Using incentive payments to promote human–carnivore coexistence
Conservation Biology, EarlyView.Abstract For many large carnivores, minimizing the financial burden they impose on local people is critical to their conservation. Incentive‐based programs that provide people with financial benefits for taking pro‐conservation actions or achieving conservation goals are a promising tool for promoting human–carnivore coexistence. Although the number of
Adam Pekor +9 more
wiley +1 more source
Rope Elastic Influence and Aerodynamic Parameter Measurement in Wind Tunnel of WDPSS-8 [PDF]
, 2016 风洞试验是获取飞行器性能参数的重要手段，相对于传统的硬式支撑方式， 绳索牵引并联机构作为一种新的支撑系统，具有惯性小、结构刚度高、负载能力 强、对流场影响小等优点。本文针对绳索牵引并联支撑系统在风洞试验中的应用， 重点分析了牵引绳弹性形变对飞行器模型运动位姿精度的影响及误差补偿策略； 结合课题组建立的原理样机进行了风洞试验，对利用绳拉力解算气动参数的方法 进行了理论分析和试验验证，主要工作及成果如下所述。 首先，描述了系统构成及应用参数，建立了运动学和动力学模型，并对机构 进行了刚度分析 ...
马少宇
core
Conservation Biology, EarlyView.Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta +24 more
wiley +1 more source
, 2013 微生物的硝化与反硝化作用是人工湿地脱氮的主要途径,如何调控与优化湿地沿程溶解氧浓度和污水碳氮比,对于提高人工湿地脱氮效果至关重要。为此,在人工湿地前端埋设曝气管、后端增设碳源投加管,构建了一种人工湿地强化脱氮系统,并选择曝气速率、曝气运行/停止时间比、碳源投加量、进水方式进行正交试验,开展了人工湿地碳氧联合调控脱氮研究。结果表明,各因素的影响大小依次为:曝气运行/停止时间比>曝气速率>碳源投加量>进水方式;最优运行条件为:曝气速率为2.5 L·h-1,曝气运行/停止时间比为8 h/16 h ...
屈娟娟 +4 more
core
Conservation Biology, EarlyView.Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair +17 more
wiley +1 more source
Gaoya dianqi, 2000 介绍了高压开关设备和控制设备的振荡波抗扰性试验的必要性、试验要求及试验准则。阐述了对试验波形和技术参数的要求 ,给出了试验线路。试验配置、试验中应注意的问题及试验结果的评定。
任稳柱 +3 more
doaj
, 2012 以水稻、高粱和玉米为研究对象,考察了微囊藻毒素对受试作物的毒性差异,研究了不同浓度MC对萌发及萌发初期生长发育的影响,不同灌溉时期对受试作物生长发育的影响,检测指标包括发芽率、株高、鲜重、叶绿素、根系活力等。结果表明,受试作物对微囊藻毒素毒性并不一致,水稻发芽率受到明显抑制,高粱发芽率基本不受影响,玉米出现了低浓度促进、高浓度抑制的现象;MC对水滔、高粱和玉米的光合作用、株高和鲜重没有抑制作用,反而有一定的促进效果;不同灌溉时间条件下的研究结果表明,萌发前对高粱和玉米染毒会明显抑制植株根系活力 ...
刘剑彤, 刘碧波, 吴烨, 耿俊杰
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao +2 more
wiley +1 more source