Results 41 to 50 of about 16,679 (163)
Compliance in Regulatory Gray Areas: The Case of the Organic Seed Standard
Policy Studies Journal, EarlyView.ABSTRACT Adaptive regulations, designed to balance flexibility with accountability, can embed provisions that unintentionally leave room for firms to shirk on their responsibilities by exploiting flexibility. We call these provisions “regulatory gray areas,” and ask: how should we understand (non‐)compliance in adaptive regulatory settings?
Liza Wood +3 more
wiley +1 more source
Shiyou jixie, 2014 对压裂球进行受力分析和地面承压测试是开发高性能压裂球的关键。采用有限元数值模拟方法对压裂球进行了受力分析，研究了不同压力对压裂球内应力和塑性变形区域的影响规律，并通过承压试验测试了压裂球的承压性能。为了模拟真实的密封过程，选择显式动力方法定义分析步，在整个过程中认为球座无变形。分析结果表明，压裂球在不同压力载荷下的应力集中区域为球与球座接触区，随着压力的增大，应力集中区和塑性变形区逐渐向球心延伸；当压力超过110 MPa时，压裂球最大应力值已经接近材料的应力极限。
左争云 +3 more
doaj
Dizhen xuebao渝东南武隆地区志留系龙马溪组页岩储层发育，构造裂缝是页岩气运移和聚集的主控因素，而古构造应力场控制着构造裂缝的发育，对武隆地区页岩气的勘探开发具有较大影响。本文对武隆地区及周缘发育的节理进行分期配套处理，明确了武隆地区的古构造应力方向，同时通过岩石声发射实验计算得到了古构造应力的大小。在此基础上，利用ANSYS有限元软件建立了武隆地区志留系龙马溪组地层关键构造变形期的地质模型，并通过构造应力场的分析结果明确了该地区关键构造期的构造应力特征，以确定构造应力场数值模拟的边界条件，进而对构造应力场进行数值模拟。
Yizhen Pang +8 more
doaj +1 more source
Research on process parameters of directional hydraulic punching considering creep effect in composite coal seam [PDF]
With the increasing depth of coal mining and the difficulty of gas control in China, the technology of directional hydraulic punching to enhance gas extraction in composite coal seam has been widely promoted and applied.
Dingqi LI, Yi LIU, Yubo CHEN
core +1 more source
Veterinary Dermatology, EarlyView.ABSTRACT Background Advances in transcriptomics have driven the demand for minimally invasive, reproducible and high‐yield skin sampling methods, particularly for studying inflammatory skin diseases in companion animals. Hypothesis/Objectives We tested tolerability, feasibility and RNA quantity and quality of three minimally invasive skin sampling ...
Ina Herrmann +2 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2016 H形钢悬臂柱柱脚焊缝的疲劳性能对钢柱疲劳寿命起控制作用,应用热点应力的表面外推法,通过建立数值计算模型,对弯矩、扭矩和弯扭共同作用下柱脚焊缝热点应力进行了分析。选取翼缘与底板厚度比(t1/t2)、翼缘和腹板厚度比(t1/t3)、腹板厚度(t3)与型钢截面高度(h)作为影响因素,对热点应力集中系数SCFhs进行参数分析。分析结果表明,其它条件不变的情况下,弯矩作用下的热点应力集中系数SCFmhs随着(t1/t3)和(t3)的增大而减小,但与(t1/t2)关系不大,h增加可导致SCFhs增大,建议取为1 ...
张晨阳, 芦燕
doaj
Typical characteristics of deep coal seams with high outburst risk, outburst inducing mechanism and prevention measures [PDF]
Coal mining in China has gradually entered deep levels. With the continuous increase in mining depth, the outburst risk of coal seam has significantly increased, with both the frequency and intensity of outbursts rising noticeably, posing huge challenges
Baiquan LIN, Tong LIU, Wei YANG
core +1 more source
Indentation effect on the fatigue limit of axle steel [PDF]
, 2016 A hardness tester was used to make indentations on the hourglass fatigue specimens of axle steel,and notches were machined by electronic discharge machining(EDM).The fatigue limits of both indentation specimens and notched ones were examined and compared
DAI Guang-ze +4 more
core +1 more source
Policy &Internet, Volume 18, Issue 2, June 2026.ABSTRACT In an era of proliferating but divergent data protection regimes, the European Union's rights‐based approach and China's sovereignty‐centric model have become two dominant poles of global data governance. This article examines how multinational enterprises navigate compliance under these dual systems and how that compliance is shaped through ...
Yiping Cao
wiley +1 more source
应力增量触发断层岩体能量释放模拟与地震成因探讨—以龙门山断裂带为例
Dizhen xuebao, 2019 本文以龙门山断裂带为背景，基于岩体应变能基本理论，使用FLAC软件模拟地震能量源和能量释放形式，计算结果显示：在0.01 MPa水平应力增量作用下，龙门山断裂带及附近区域可释放的应变能约为3.24×1013 J；使得断层面之间发生滑移，克服断层面滑动摩擦所需消耗的能量约为2.10×1013 J；岩体在重力方向上产生位移，克服重力做功所消耗的能量约为1.14×1013 J。由此可推断：在一定区域内，应力触发释放能量值与克服断层面滑动摩擦和克服重力做功所消耗的能量之和大致相当 ...
Haoyu Shi +4 more
doaj +1 more source