Results 41 to 50 of about 847,212 (208)
, 2004 鉴于并联机床普遍存在有效作业空间小、运动控制复杂和实用刚度还不理想等不足．采用了串并联混合式机床运动结构．针对所研究的4—4构型串并联机床,分析了影响作业性能的几何约束条件,采用基于位置逆解模型的极限边界数值搜索法,确定了机床作业空间,并通过数值仿真研究获得了机床运动参数和结构参数对作业空间的影响规律 ...
徐志刚 +5 more
core
Optimizing biodiversity offsetting for habitat succession and colonization dynamics
Conservation Biology, EarlyView.Abstract Biodiversity offsetting aims to compensate for ecological losses from development through conservation and restoration. However, its long‐term outcomes under repeated impact–offset cycles remain uncertain. Using a conceptual forest succession model, we evaluated how offset outcomes are affected by interactions among compensation scale ...
Konstans Wells +4 more
wiley +1 more source
, 1980 本工作用实验的方法去探讨针刺对痛阈作用的空间关系。刺激仪器为57-6电脉冲医疗刺激仪。测痛仪器为弹簧压力测痛器。对象是正常人,电针刺激右三阴交、左合谷,频率为2次/秒。测痛的部位是右上臂外关穴 ...
幸代高 +3 more
core +1 more source
Shuitu Baochi Xuebao, 2019 基于5年的田间小区定位试验，采用干筛法对不同施氮水平下的玉米单作、马铃薯单作和玉米马铃薯间作土壤进行团聚体分级并测定各粒级团聚体有机碳含量，研究间作对土壤团聚体有机碳储量的影响及其氮调控效应。结果表明：92%以上的土壤有机碳储藏在土壤大颗粒团聚体（>2 mm）和小颗粒团聚体（2~0.25 mm）中。间作提高了土壤大颗粒团聚体（>2 mm）和小颗粒团聚体（2~0.25 mm）的比例，但对不同粒级团聚体有机碳含量的影响与施氮量相关。对比2种单作，间作在低氮（N1）和常规施氮（N2）下增加了土壤总有机碳储量 ...
向蕊 +6 more
doaj
, 2006 在本研究中，我们利用两种实验鱼——斑马鱼和稀有鮈鲫，通过核移植技术将前者的细胞核植入后者的去核卵，形成异种间克隆胚胎。我们利用该模型开展了关于细胞质和细胞核间的相互作用及克隆胚胎中细胞核再程序化机制的研究。1.利用克隆出的稀有鮈鲫的COXI基因，构建进化树，结果确定斑马鱼和稀有鮈鲫间的克隆关系为亚科间的克隆。另外，克隆出斑马鱼的GAPDH，并证明GAPDH 基因可以作为鱼类亚科间克隆胚胎转录分析的良好内参。2.利用斑马鱼和稀有鮈鲫的克隆胚胎模型，结合抑制性消减杂交差异显示技术，建立了正向 ...
裴得胜
core
How endorser attributes influence conservation communication
Conservation Biology, EarlyView.Abstract Conservation communication often uses the celebrity endorsement strategy. However, robust evidence regarding its effectiveness is still limited. More importantly, practitioners do not have guidelines for selecting an ideal endorser because there is no clear consensus on what endorser attributes are most critical.
Xia He, Tien Ming Lee
wiley +1 more source
Shuitu Baochi Xuebao, 2019 为了研究土著丛枝菌根真菌（arbuscular mycorrhizal fungi，AMF）与间作模式对坡耕地红壤径流氮形态变化的响应，通过自然降雨条件下的径流小区模拟试验，设置不同种植模式（单作玉米、玉米/大豆间作、单作大豆）和不同菌根处理（抑菌（喷施苯菌灵）、未抑菌）进行研究。根据2017年6-9月采集的6次径流水样，分析比较菌根与间作复合处理下径流氮形态变化迁移特征。结果表明：在6次取样时间内，地表径流总氮浓度呈先上升后下降的趋势，硝态氮浓度呈先上升后下降再上升的趋势 ...
李婷 +6 more
doaj
A Systematic Scoping Review of Self‐Regulated Learning With AI in Language Education
International Journal of Applied Linguistics, EarlyView.ABSTRACT The rapid development of artificial intelligence (AI) technology has brought new opportunities for second/foreign language (L2) education while also raising concerns about the use of AI tools. This systematic scoping review provides a snapshot of the current state of research situated at the intersection of self‐regulated learning (SRL) and AI
Zheng Zhang, Sihan Zhou, Barry Bai
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2011 目的检测不同浓度梯度的高浓度化疗药物持续作用不同时间对肝癌细胞系HepG-2的作用,并探索化疗药物有无浓度、时间饱和现象。方法每种化疗药选择5个浓度及四个时间段,采用MTT法分别检测不同浓度及作用时间的8种化疗药物对体外培养的HepG-2细胞的抑制率。结果各种药物不同作用浓度及时间对肝癌细胞系有不同的抑制度;对于任一药物而言,作用浓度—时间之间存在关联,每种药物均有其饱和浓度及作用时间。结论不同化疗药物有其最佳时间—浓度曲线;可以据此优化化疗方案;实现介入治疗个体剂量精确化。
朱林忠, 朱旭, 杨仁杰, 宁涛
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Multilingual students in Anglophone universities often operate in survival mode. While translanguaging supports learning, critical gaps remain in understanding how translanguaging pedagogies transform and sustain motivation in English‐dominant contexts.
Melissa Jufenna Slamet, Julie Choi
wiley +1 more source