Results 11 to 20 of about 560,483 (151)
, 2010 时空可变系多线矢物理学 中国科学院 力学研究所 吴中祥 提 要 按相对论所表明的，高速(3维空间速度与真空中光速相比，不可忽略)运动物体，必须由4维时空表达，
吴中祥
core +2 more sources
Shuitu Baochi Xuebao, 2022 为明确黄土高原地区植被长期恢复的土壤碳汇效应,采用时空互代的方法,研究子午岭地区150年以来8个植被演替序列的土壤有机碳含量及储量的变化特征,分析影响土壤有机碳储量变化的植被因素。结果表明:从农地演替到气候顶级辽东栎(Quercus wutaishanicaMary.)群落,土壤有机碳含量和储量明显增加,表现为演替前期(草本群落)快速增加,后期(乔木群落)趋向稳定的变化特征。剖面上来看,随着土层加深,土壤有机碳含量迅速减少。0—5 cm土层土壤有机碳含量与5—20,20—40 cm土层差异显著(P＜0 ...
许小明 +7 more
doaj +2 more sources
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
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study examines how foreign language teachers’ beliefs about the medium of instruction and translanguaging evolve over time by revisiting three in‐service teachers twelve years after their initial interviews. Using a qualitative longitudinal design, the study traces how translanguaging was initially framed as pedagogically deficient but ...
Danping Wang
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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
wiley +1 more source
Inverse Thermal Softening Behavior in a High‐Entropy Alloy Under Various Strain Rates
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Although face‐centered cubic high‐entropy alloys (HEAs) have received extensive attention and in‐depth research, most existing studies focus on single temperature or strain rate conditions, lacking systematic investigations into deformation mechanisms under extreme thermomechanical coupling environments.
Zhi Wang +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2023 为探讨安徽省土地利用变化对碳储量的影响,揭示碳储量时空演化特征和未来变化趋势,通过耦合InVEST模型碳储存模块和PLUS模型,分析1990—2018年安徽省土地利用类型和碳储量时空演化特征,并从自然发展和生态保护情景预测2034年、2050年安徽省碳储量变化趋势。结果表明:安徽省1990年、2000年、2010年、2018年的碳储量分别为1 218.37×106,1 215.65×106,1 211.39×106,1 206.18×106 t,呈现逐年减少趋势,主要由于耕地、林地被侵占。此外 ...
孙方虎 +6 more
doaj
Integrative Conservation, Volume 5, Issue 3, Page 255-267, September 2026.This study presents a comprehensive review of the 500‐year spatiotemporal evolution of global botanical gardens, identifying three major development stages—initial exploration (1543–1699), steady expansion (1700–1899), and rapid proliferation (1900–2020)—with six distinct sub‐stages. We propose a tripartite driving framework grounded in colonial botany
Shidong Li, Guangzhen Shi, Qingwei Li
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Shuitu Baochi Xuebao, 2023 生境质量是衡量一个地区生态环境优劣的重要参考指标,土地利用变化研究可为区域生境质量时空动态演变特征评估提供科学依据。基于1980年、2000年、2018年土地利用数据,通过InVEST模型、PLUS模型、地理信息图谱法分析并预测榆林市土地利用变化情况,以此探究陕西省榆林市生境质量时空演变特征。结果表明:(1)榆林市景观基质主要由草地和耕地构成,林地和未利用地次之,水域和建设用地占比相对较少,退耕还林政策的实施、治沙工程的开展,以及建设用地的开发是土地利用变化的主要驱动因素。(2)从区域整体分析 ...
冀泳帆 +4 more
doaj
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT NiCoCrAlYTa coatings are widely used as bond coats in thermal barrier coating (TBC) systems for gas turbines and aeroengines to provide oxidation resistance and support the formation of a protective thermally grown oxide (TGO). Herein, high‐current pulsed electron beam (HCPEB) modification was utilized to strengthen a NiCoCrAlYTa coating by ...
Xiangcheng Li +6 more
wiley +1 more source