Results 71 to 80 of about 502,313 (277)
Integrative Conservation, EarlyView.This research reveals the functional stability of mixed species foraging flocks (MSF) and their foraging height change with different taxonomic differences along the elevational gradient at Knuckles Montane Reserve, Sri Lanka. This offers new insights into how MSFs sustain with the elevational gradients supporting the altitudinal shifting species ...
Vimukthi. R. Gunasekeara +3 more
wiley +1 more source
He jishu编码孔径成像广泛应用于低能量（<0.2 MeV）伽马成像领域，其在中高能段（0.2~5 MeV）的应用也在得到逐步拓展。为解决中高能伽马成像中串扰光斑、内散射增强所导致的成像性能恶化的问题，提出了基于推测首次反应位置的降噪方法。通过使用掺铈钆铝镓石榴石晶体（Cerium-doped Gadolinium Aluminum Gallium Garnet，GAGG：Ce）与硅光电倍增管（Silicon Photon Multiplier，SiPM）阵列耦合，并使用A5202采集模块读出 ...
安 焜豪, 何 雷, 黄 跃峰
doaj +1 more source
Laser &Photonics Reviews, EarlyView.This work introduces two types of bound states in the continuum (BICs) and their merging in a waveguide‐resonator system, which significantly enhances the quality factor (Q$Q$). Benefiting from the high‐Q$Q$ characteristics of quasi‐BICs, a sensitivity‐tunable complex permittivity sensor is developed based on this system, achieving improvements of 93 ...
Yuhang Yang +7 more
wiley +1 more source
Justice in coexistence: Pastoralism and large carnivores on the Qinghai‐Tibet Plateau
People and Nature, EarlyView.Abstract The conflict between livestock husbandry and large carnivore conservation presents significant challenges in grassland ecosystems worldwide. Achieving sustainable coexistence among herders, livestock and large carnivores requires reconciling diverse perspectives and interests through equitable, inclusive and fair processes that address both ...
Yufang Gao, Yue Yu
wiley +1 more source
He jishu六方氮化硼具有与石墨烯类似的六元环组成的片层结构，因而呈现出优异的机械性能和导热性能，在诸多应用领域受到广泛关注。基于六方氮化硼制备工艺的高能耗问题，本文旨在提出一种更加绿色、低能耗的制备工艺。本工作使用熔盐介质法作为制备工艺方法：以氯化钾-氯化钠（KCl-NaCl）为熔盐体系，三聚氰胺（C3N6H6）和硼酸（H3BO3）为反应物，通入氮气（N2）作为反应气体。该研究通过改变熔盐与反应物质量比、反应物中氮-硼摩尔比、保温温度、保温时间等条件，系统研究了不同条件对制备六方氮化硼产物的影响 ...
黄 宇灿 +5 more
doaj +1 more source
智能城市应用在铁路行业的持续发展中，工具管理一直是一个至关重要的环节。传统的铁路工具管理方法由于技术和管理手段的限制，往往存在管理效率低下、资源浪费严重等问题。为了解决这些问题，提出了一种基于物联网、大数据和人工智能等技术的铁路智能工具管理系统。该系统通过引入RFID技术、传感器技术、数据分析技术等，实现了对铁路工具的精准追踪、高效管理和优化使用，显著提高了铁路工具的管理水平和使用效率。
新路 张
semanticscholar +1 more source
Rare Metals, EarlyView.ABSTRACT To break electromagnetic wave absorption (EMA) tech's single‐attenuation bottleneck, enhancing multi‐wave absorption synergy in composites is key for microstructure design. This study uses mesoporous hollow carbon spheres to make metal nanospheres with cobalt, iron, and nickel nanoparticles, then encapsulates them via electrospinning into a ...
Wei‐Lian Zhang +10 more
wiley +1 more source
He jishu小型模块化熔盐堆具有广泛的发展前景，但由于受到空间尺寸、传热效率和高温工作环境的限制，对熔盐换热器的性能提出了较高的要求。因此对不同微通道换热结构在高温环境下的流动换热特性的研究具有重要意义。本研究采用数值模拟方法，以熔盐（FNaBe）-超临界二氧化碳（SCO2）换热器为研究对象，在FNaBe熔盐侧分别采用Z型和波浪型等两种板翅式通道结构，在SCO2侧分别采用椭圆翅片和翼型翅片两种通道结构，对4种通道结构的整体和局部流动传热特性进行了研究分析。研究结果表明：熔盐侧Z型流道具有更强的传热性能 ...
李 哲, 陈 玉爽, 杨 晓虹
doaj +1 more source
Rare Metals, EarlyView.ABSTRACT The poor Zn chemistry of Zn metal anode and sluggish reaction kinetics of cathodes at high mass loadings are two crucial issues for hindering the application of aqueous Zn‐ion batteries (AZIBs). Herein, the hierarchical porous N‐doped carbon fibers (HPNCFs) were proposed to simultaneously optimize the reversibility of Zn plating/stripping of ...
Song Yang +6 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng +7 more
wiley +1 more source