Results 31 to 40 of about 18,273 (143)
教育研究, 2019 在现代教育事业迅猛发展下,信息技术学科地位大大提升,受到了广大教育工作者的重视。在初中信息技术教学中,传统教学模式过分关注学生计算机基础知识掌握,以教师为中心,学生被动式听从教师安排,在一定程度上制约学生自主学习能力培养。为了改善现有教学中的不足,应该进一步推动初中信息技术教学改革,紧紧围绕学生主体来调整信息技术教学内容,培养学生的自主学习能力,可以将所学知识灵活运用到实际问题解决中。基于此,本文就初中信息技术教学展开分析,结合实际情况,提出合理措施来培养学生的自主学习能力,构建高效信息技术课堂。
Dong-Yu Wang
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World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT Agricultural development initiatives in sub‐Saharan Africa have emphasized improved crop varieties as a pathway to food security, resilience, and rural poverty reduction. However, empirical evidence often focuses narrowly on plot‐level outcomes and overlooks whole‐farm effects and the substantial heterogeneity in farmers' management practices,
Kodjo Kondo +4 more
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Jianzhu Gangjiegou Jinzhan, 2018 圆钢管桁架在主管内填筑混凝土,可有效提高其承载力。为了获得圆钢管混凝土桁架K形节点受力性能和承载力计算方法,研究了在受拉或受压支管处K形节点的失效模式和破坏机理;基于圆钢管混凝土K形节点在不同失效模式下的破坏机理和受力状态,分别对支管截面形式为圆形或矩(方)形的圆钢管混凝土K形节点建立合理的简化计算模型,推导出不同失效模式下K形节点极限承载力计算公式,并给出相应的极限承载力建议公式。试验验证了圆钢管混凝土K形节点的试验值与计算值吻合较好,研究表明圆钢管混凝土K形节点的极限承载力计算公式的准确性 ...
王静峰, 邓权, 邢文彬
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全球能源互联网, 2018 当前中国和其他国家的电力市场再一次面临着深刻变革，传统的电力市场理论受到挑战。本文对新背景下的电能商品品质衡量及定价机制问题进行了初步探讨。作为理论研究的基础，首先剖析了电力市场/电力系统组成的大规模复杂系统中电力系统物理层、商品交易层和金融交易层这3个层次问题的区别与联系。提出从波动性、易控性、随机性3个维度对电能商品品质进行衡量，并在功率数值的基础上加入时间维度形成由功率—时间对组成的连续时间电能商品模型以反映不同的商品品质，并基于泛函极值优化理论发展出基于连续时间商品模型的电力市场理论 ...
陈皓勇, 李立浧
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World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT This critical ethnographic study examined the perspectives of service providers and organizational leaders working within charitable food services for people experiencing homelessness in two Canadian cities. Informed by Paulo Freire's writings and a human rights‐based approach, we explored how power is enacted through everyday practices and ...
Corinna Easton +4 more
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World Water Policy, Volume 12, Issue 4, November 2026.ABSTRACT Biochemical oxygen demand (BOD) remains a core indicator of organic pollution in freshwater monitoring, but its role in water policy and practice is changing as water‐quality assessment moves toward predictive, integrative, and decision‐support approaches.
Isadora Favero Roque Cenci +5 more
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Shiyou jixie, 2014 弹性爪机构是海上完井滑套开关工具中最重要的部件，其力学性能稳定性对于作业成败至关重要。基于受力分析和有限元模拟，建立开关工具弹性爪力学理论模型和三维有限元分析模型，研究弹性爪结构应力分布与作业性能。基于受力理论分析可知，弹性爪机构最大轴向拉力为4 116 N，最大应力为675 MPa；基于有限元模拟计算，弹性爪机构最大轴向拉力为3 924 N，最大应力747 MPa，弹性爪结构强度满足要求。功能试验结果表明，理论计算方法存在一定的误差，有限元模拟结果相对比较精确和可靠 ...
刘传刚 +4 more
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Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT Artificial intelligence (AI) has gained much interest in public administration and public policy fields in recent years. Research on and that uses AI has so far treated it as an object or context within the broader administrative and governance discourse.
Yanto Chandra, Jianxiang Tan
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Aqueous Zn‐ion batteries (AZIBs) are expected to become one of the most promising candidates for large‐scale energy storage, but are impeded by uncontrollable dendrite growth and parasitic reactions. In this study, we propose a simple mechanical shot‐peening (SP) approach for restructuring commercial Zn foils into highly exposed (002)‐textured
Xu Ma +7 more
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Dianci bileiqi, 2019 随着风力发电的日益普及,风电机组桨叶的雷击灾害问题愈发严重。针对这一问题,本文分析了桨叶与雷云间先导放电的发展机理,阐述了旋转桨叶的引雷效应,揭示了风机桨叶内部遭受雷击的物理过程,并通过先导发展理论对接闪过程进行了仿真验证。结果表明,后续回击是风机桨叶内部遭受雷击的主要原因,风机桨叶初始角度、旋转速度、回击间隔时间及雷电流幅值均会对雷击位置造成影响。
张子信 +5 more
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