Results 21 to 30 of about 107,299 (154)
, 2008 通过对香溪河悬浮颗粒物粒度及浓度的实验分析,研究梯级水电站开发对河流悬浮颗粒物的影响,结果表明:(1)香溪河干流悬浮颗粒物粒径由上游到中游逐渐减小,并且在无水电站干扰时颗粒物粒径减小幅度较大;(2)从进水口至出水口河段,水电站悬浮颗粒物粒径总体变化不显著;(3)水电站从进水口河段至出水口河段,总悬浮颗粒物浓度(CTPM)在某些位置有所增加,有机颗粒物浓度(CPOM)无明显变化 ...
董正举 +5 more
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Shuitu Baochi Xuebao, 2018 为探究煤矸石对盐碱土壤绿化的改良效果和对土壤微生物的影响，将不同用量（0，10%，20%，30%，40%，50%）和不同粒径（小粒径5 mm，以及小中大粒径等比例的混合粒径）煤矸石施用于盐碱土壤，进行紫花苜蓿盆栽试验，测定紫花苜蓿株高、生物量以及土壤微生物量和酶活性指标。结果表明，不同粒径煤矸石处理的土壤微生物量碳氮，土壤的脲酶、过氧化氢酶、脱氢酶活性，以及紫花苜蓿株高、生物量均随着煤矸石用量的增加呈先增大后降低的趋势，混合粒径、小粒径、中粒径、大粒径煤矸石处理的盐碱土上述指标分别在20%，20%，30%
孔涛 +5 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT A facile coprecipitation‐pyrolysis strategy was employed to fabricate Cu/Co nanoparticles (NPs) embedded in nitrogen‐doped carbon matrices (Cu/Co@N‐C) through the carbonization of CuCo‐MOF precursors. Moreover, monometallic counterparts of Cu@N‐C and Co@N‐C were also prepared via carbonization of bimetallic CuZn‐MOF and CoZn‐MOF, respectively.
Weinan Yao +7 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT The commercialization of lithium–sulfur batteries (Li–S batteries) has been hindered by the shuttle effect of lithium polysulfides (LiPSs) and sluggish redox kinetics. In this study, we constructed a three‐dimensional hollow conductive network host material for sulfur with synergistic enhancement effects.
Jie Yang +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Due to their exceptional porosity, structural versatility, and modular coordination chemistry, metal–organic frameworks (MOFs) have emerged as versatile platforms for targeted drug delivery. These structures enable fine‐tuning of pore size, surface activity, and framework stability for the encapsulation of a broad range of therapeutics ...
Rui Hua +9 more
wiley +1 more source
Gongye shui chuli, 2008 采用浊度法检测含有微量细小的分子筛颗粒和金属镍颗粒的悬浮液中微量固体颗粒浓度,并对相关因素的影响进行了研究。结果表明:在实验范围内,悬浮液微细颗粒的浓度与悬浮液浊度成线性关系；对微细颗粒悬浮液,采用d32(Sauter直径)作为平均直径比采用中位直径d50更能反应出粒径因素对浊度的影响。
孟庆功 +3 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT To overcome the challenges of the strength‐ductility trade‐off in laser additively manufactured (LAM) titanium alloys, and to avoid the intragranular microstructure degradation often caused by an exclusive focus on grain equiaxialization, this work proposes a novel strategy of “grain morphology‐intragranular microstructure co‐optimization ...
Kexin Zhao +8 more
wiley +1 more source
Dianci bileiqi, 2013 为今后实现自然积污规律研究和防污的差异化,对污秽颗粒等效简化模型、大气总悬浮颗粒物（TSP）的粒径分布函数、绝缘表面污秽主要化学成分对应TSP的粒径分布进行了综述和分析,认为可以污秽颗粒可等效简化为球体,使用空气动力学粒径衡量其粒径;建立TSP粒径分布函数拟合模型;分析认为化学成分Ca2+、SO42-、Cl-、SiO2、Al2O3在TSP中的粒径主要分布在1.810μm,010μm,1.810μm,30-40μm,40μm50μm的范围内,最后对自然积污规律研究和防污的差异化进行了展望。
李恒真 +5 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT The demand for advanced aerospace components necessitates near‐α titanium alloys with enhanced high‐temperature performance and compatibility with additive manufacturing (AM). To address this, an in situ alloying strategy was employed to co‐modify a Ti‐6.5Al‐2Zr‐Mo‐V alloy with Si and Y during laser powder bed fusion.
Zishuo Ma +10 more
wiley +1 more source
Shuitu Baochi Xuebao, 2018 通过天然降雨试验，研究我国5种典型土壤的侵蚀泥沙团粒和单粒粒径分布以及泥沙各级团粒的机械组成特征。2013—2014年汛期（6—9月），监测红壤、紫色土、黄绵土、褐土和黑土径流小区的降雨产流事件，收集侵蚀泥沙样品，利用湿筛法和吸管法测定其团粒和单粒粒径分布；同时，筛选出泥沙各级团粒样品，进一步测定其单粒粒径组成。结果表明：（1）侵蚀泥沙粒径分布是土壤质地和降雨强度综合作用的结果，团粒粒径分布更适合作为表征泥沙输移的指标；（2）5种土壤的侵蚀泥沙皆表现出粉团（0.002～0.05 mm）和黏团（＜0 ...
郝燕芳, 刘宝元
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