Results 41 to 50 of about 8,910 (170)
The Future of AI in the GCC Post‐NPM Landscape: A Comparative Analysis of Kuwait and the UAE
Politics &Policy, Volume 53, Issue 6, December 2025.ABSTRACT Comparative evidence of how two Gulf Cooperation Council (GCC) states translate artificial intelligence (AI) ambitions into post–New Public Management (post‐NPM) outcomes are scarce because most studies focus on Western democracies. To fill this gap, we examine constitutional, collective choice, and operational rules that shape AI uptake in ...
Mohammad Rashed Albous +2 more
wiley +1 more source
Community‐informed and codesigned research to understand the impacts of railways on wildlife
Conservation Biology, Volume 39, Issue 5, October 2025.Abstract Trains cause mortalities of several animal species, but the ecological impacts of railways are understudied. Most research on wildlife–train collisions has focused on large mammals, but understanding railway‐specific risks for underrepresented taxa, especially vulnerable species, is important for developing effective mitigation strategies ...
Kyle D. Vincent +5 more
wiley +1 more source
Gaoya dianqi, 2014 利用脉冲变压器与陡化开关结合的方式,可以更容易地构造出在紧凑性、稳定性及寿命等方面性能优良的高压脉冲源。相比于铁心式变压器,空心螺旋线型变压器不含铁心,通过初次级绕组进行能量耦合,因而在体积、重量和峰值输出变比等方面更具优势。笔者对空心变压器的基本理论进行了分析,研制了设计变比3:660,带载电容100 p F,输出电压峰值为150.0 kV的油浸式变压器样机。通过初级和次级电容构成谐振充电回路,并采用快速晶闸管作为低压侧放电控制开关,对空心螺旋线型变压器的充电特性进行了实验研究。实验结果表明 ...
李伟, 刘云龙, 杨乐
doaj
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 5, Page 624-632, May 2025.ABSTRACT Objectives Placental insufficiency contributes to many obstetric pathologies, but there is no bedside clinical tool to evaluate placental perfusion. We have developed a method to acquire multiple three‐dimensional (3D) power Doppler (PD) ultrasound (US) volumes of placental vasculature, with infrared camera tracking of the precise spatial ...
A. Xue +5 more
wiley +1 more source
Dianci bileiqi, 1993 将用真空练泥机挤制的空心泥段,经粗修阴干后,再粘接、精修,这是大型瓷套最基本的成型方法.但这种方法生产效率低.60年代曾采取真空挤制整体毛坯,然后阴干整形内孔,用靠模样板及热处理合金钢修坯刀立式车削成型的方法,生产效率大大提高 ...
鲁延宾
doaj
Jianzhu Gangjiegou Jinzhan, 2023 为研究粗骨料类型、空心率、长细比和偏心距对方中空夹层钢管陶瓷再生混凝土柱偏压力学性能的影响，进行了16根试件的偏压试验，其中粗骨料类型分别为废弃陶瓷和天然碎石。试验结果表明：所有试件均表现为弹塑性失稳破坏；试件的极限承载力和抗弯刚度随长细比和偏心距的增大而降低，其中中空夹层试件的极限承载力高于实心试件的相应值；陶瓷再生混凝土试件展现出了较好的延性和变形能力，其极限承载力与普通混凝土试件接近。使用有限元软件对试验进行模拟，模拟得到的荷载-跨中挠度曲线整体与试验曲线接近。采用T/CCES 7—2020和DB
黄宏 +5 more
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Shuitu Baochi Xuebao, 2007 利用软隔离小区试验研究了凤眼莲(Eichhornia crassipes)、黄花水龙(Jussiaen repens L.)、空心莲子草(Alternanthera philoxeroides(Mart.)Griseb.)、水鳖(Hydrocharis dubia(Bl.)Backer.)和四角菱(Trapaquadrispinosa Roxb.)5种不同漂浮植物对富营养化景观水体的净化效果,研究结果表明,经过100天植物处理,5种飘浮植物对水体中总氮的去除率为黄花水龙(63)%>凤眼莲(57%)>水鳖(
吴湘, 杨肖娥, 李廷强, 方云英
doaj +2 more sources
Shiyou jixie, 2015 为了研究离心泵发生空穴后的工作性能，将Singhal空穴模型和Mixture多相流模型相结合，运用RNGκε湍流模型和SIMPLE算法对离心泵的三维流场进行计算流体动力学数值模拟，并预测其性能曲线。研究结果表明，压力自叶片工作面的根部向尾部逐渐增大，然后从背面的尾部向根部不断下降，在入口端容易发生空穴。空穴的临界条件为泵入口压力58 104 Pa或出口压力187 792 Pa。当泵发生空穴时，叶轮内的流线偏离叶片型线，并在流量下降时出现大尺度漩涡，造成泵的扬程和效率急剧下降。在设计流量下 ...
张琴 +5 more
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Shuitu Baochi Xuebao, 2018 为改善空心村复垦为耕地后的土壤状况，迅速恢复农业生产，选取7种不同还田材料进行小区试验，分析了不同还田材料对土壤贮水量、养分含量、株高、玉米产量及水分利用效率的影响。结果表明：不同还田材料在夏玉米生长季0—105 cm土层土壤贮水量显著高于对照 ...
雷娜, 陈田庆, 董起广, 罗林涛
doaj
Studies on the Improvements of Quality and Yield of Frozen Broccoli
, 2019 本研究目的在於探究影響冷凍用青花菜品質及産量之因子作爲生不改進之依據，以利加速發展台灣青花菜之冷凍加工事業，調節夏季內銷市場之供銷歐美市場爭取外滙。早生，中生品質青花菜均可在科冬季隨時播種，栽培供冷凍之用，其中尤以Pacifica, Fengshan, Spartan Early品種，苔梗較短，花蕾緊密，空心率低，解凍後之品質良好，Fengshan, Sapartan Early株型較矮小，宜以密植栽培提高其單位積産量。株距25cm比30cm之産量高過10%以上，行距50cm比65cm之産量高18%左右，
Chao-Hsiung Lin, 林昭雄
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