Results 11 to 20 of about 134,894 (128)
, 2015 增强型地热系统(EGS)旨在经济开采地下3~10 km区域干热岩蕴含的热能,并用于地面发电。EGS经济性与其采热性能直接关联,人工热储内热交换过程是需要重点研究的内容。热储内裂隙形貌及分布对采热过程有重大影响。基于热储裂隙开度和长度的分形特征,本文建立起EGS分形分叉网络模型,推导出EGS采热速率表达式。分析发现泵功、裂隙最大开度、扭曲率分形维数、裂隙开度分布分形维数 ...
罗良, 曹文炅, 蒋方明
core +4 more sources
, 2007 本文在推导热力作用下水合物地层温度分布基础上，发展了评价热力法开采天然气水合物的热效率（用于水合物分解的热量与输入总的热量之比）和能量效率（即输出能量与输入能量之比）的模型。模型分析表明，水合物地层热物性参数以及水合物饱和度决定了热力法开采的能量效率。在注入蒸汽开采初始条件下，能量效率可以达到7 ...
杜燕, 沈致远, 冯自平, 唐良广
core +4 more sources
, 2017 恢复是保证增强型地热系统长期稳定的有效措施,本文以美国沙漠峰地热田为例,采用平行多裂隙模型对其进行采热-热恢复过程数值模拟研究。结果表明：热恢复过程初期温升迅速梯度大,后期明显减慢。热恢复的主要影响因素为热恢复温度初场及热恢复时间周期。热储激发程度与流体流量共同决定了热恢复温度初场,二者对热恢复过程的影响效应与热开采过程相一致。换热单元体厚度、流体流量及采热-热恢复周期均与产出温度和热储寿命呈负相关。系统循环流量为100 kg/s、换热单元体厚度为100 m、采热-热恢复周期为5年时,热储寿命达34 ...
苏正, 翟海珍, 凌璐璐, 吴能友
core +4 more sources
, 2006 将多孔介质中天然气水合物在热力作用下的分解过程看作一个移动边界问题,在求解等温边界条件下水合物地层中分解区和未分解区(水合物区)温度场的基础上,推导出热力法开采水合物过程中开采热效率(用于水合物分解的热量与输入热量之比)和能量效率(开采所得甲烷气体的总热值与输入能量之比)的解析表达式.在相同水合物地层条件下,对比注入热盐水(采用NaCl溶液)和热水两种开采方法,得出热盐水中盐的浓度(简称盐度)对开采热效率等的影响.计算结果表明,采用热盐水开采热效率一般在40%～70%.在开采温度300～450 K ...
李刚 +4 more
core +5 more sources
Taxonomic and functional diversity of urban bees of the world
Conservation Biology, EarlyView.Abstract Bees play a pivotal role in terrestrial environments. Urbanization can affect these organisms and the ecosystem services they provide. However, knowledge of the global diversity of urban bees is limited. Thus, we summarized data on urban bee species identities and occurrences; compared distributions of all bees with those found in urban ...
João C. F. Cardoso +10 more
wiley +1 more source
Subspecies taxonomy reflects social and geographic patterns of taxonomic effort in tetrapods
Conservation Biology, EarlyView.Abstract Subspecies have been used in conservation biology to account for intraspecific patterns in genetic diversity, which is crucial to long‐term population viability. Although over 3200 subspecies are currently assessed by the International Union for Conservation of Nature Red List, their biological relevance remains controversial.
Jhonny J. M. Guedes +3 more
wiley +1 more source
Protected areas on international borders show uneven conservation outcomes
Conservation Biology, EarlyView.Abstract Border protected areas (BPAs) are national protected areas that are immediately adjacent to a country's border or span two or more countries; they are characterized by distinctive opportunities and pressures. They play a critical role in protecting carbon‐rich ecosystems, conserving endangered biodiversity, reducing cross‐border environmental ...
Rachakonda Sreekar +10 more
wiley +1 more source
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Vanadium redox flow batteries show considerable promise for energy storage, yet their overall performance is still hindered by the limited electrochemical activity of graphite felt (GF) electrodes. Herein, using folic acid and metal salts as precursors, M–N–C functionalized carbon nanosheets (M–NC, M=Co, Fe, and Ni) were prepared via a ...
Long Jiang +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 11, November 2026.ABSTRACT Pore engineering reduces the thermal conductivity of thermoelectric materials, yet typically degrades electrical conductivity by enhancing carrier scattering—a long‐standing trade‐off. Here, we overcome this trade‐off in SrTiO3‐based entropy‐engineered ceramics via a one‐step synergistic strategy: using poly(methyl methacrylate) (PMMA) as a ...
Ziyao Wei +7 more
wiley +1 more source
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