Results 31 to 40 of about 32,188 (207)
RURIS (Campinas, Online), 2015 Este ensaio tem o objetivo de apresentar um fragmento da etnografia sobre o conhecimento naturalístico dos pescadores artesanais da Carrasqueira – pequeno povoado localizado na costa central portuguesa. O material etnográfico, produzido entre os anos de 2010 e 2011, expõe como os pescadores carrasqueiros denominam alguns dos seres que constituem a ...
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the military families and military service in the ming dynasty of tianjin wei-so [PDF]
, 2016 天津位于京师附近，同时是漕运枢纽，地理位置十分重要。永乐初年设立天津三卫，随后屯军、守军便按各自比例分派完毕。永乐末年京操和漕运全面展开，大量卫所军士被抽调为班军和运军，导致很多正军不得不承担多种军役。随着卫所杂役逐渐增多，军户余丁也被迫充役，至明中期还出现了大量帮丁。为了减轻军役负担，维护卫所社会的稳定，明中期陆续推行多层次的军役改革。正德之前，天津三卫实行均徭改革，部分军役已经折银征纳。正德年间，天津兵备副使蒋曙建议改革各项正役杂差，除京操之役外，其他军役负担都得到了不同程度的改善。万历年间 ...
李铁
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Rare Metals, EarlyView.ABSTRACT TiFe‐based hydrogen storage alloys have garnered significant attention because of their cost‐effectiveness, high hydrogen capacity, and favorable hydrogen absorption/desorption characteristics. However, practical application was limited by activation challenges and sensitivity to environmental poisoning.
Yuehai Li +8 more
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Sociologias Plurais, 2012 Comumente, em referência a atletas de futebol, evoca-se uma masculinidade tradicional (BONINO, 2008), definida como modelo social hegemônico. No presente artigo, refletir-se-á sobre a chamada "área reservada masculina" (MAGUIRE & DUNNING, 1997), considerada como relevante à manutenção das estruturas patriarcais. A partir de coberturas jornalísticas
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从“奸臣”到“地方神”——明清时期对靖难逊国臣铁铉的形象建构 [PDF]
, 2017 2014-2015 > Academic research: refereed > Publication in refereed journalVersion of ...
Yu, J
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Rare Metals, EarlyView.ABSTRACT Reliable operation of high‐performance magnetostrictive devices, composed of the giant magnetostrictive material (GMM), that is, the TbDyFe alloy, critically depends on an optimally tailored bias magnetic field. Sufficient intensity and uniformity are essential to induce the ideal initial strain in the GMM, enabling peak reciprocating output ...
Jinan Yu +12 more
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血清铁自动分析法试剂盒的研制与评价:Nitro-PAPS直接光度法
Zhongguo shiyan zhenduanxue, 2007 目的研制、评价血清铁Nitro-PAPS自动分析法试剂盒。方法在表面活性剂存在下,用2-（5-硝基-2-吡啶偶氮）-5-[N-正丙基-N-（3-磺酸丙基）氨基]苯酚二钠（Nitro-PAPS）作显色剂双试剂两点终点法测定血清铁。结果该方法显色络合物最大吸收波长为591 nm,线性范围达85μmol/L,表观摩尔吸光数为1.11×105L.mol-1.cm-1,回收率为98.5%-104.1%,批内变异系数（CV）和批间变异系数分别为0.021和0.035,与原子吸收分光光度法（AAS）比较相关良好,Y ...
王贤俊, 杨秀勤, 马连学
doaj
Gaoya dianqi, 2023 基于铁心本体的振动信号更能准确反映铁心状态，针对典型的电力变压器铁心结构，利用测振仪及声学成像系统对一台三相三柱式铁心模型开展振动及分布特性研究。实验结果表明：铁心振动以100 Hz为基频，包含整数倍高次倍频分量。铁心不同方向不同位置振动差异较大，硅钢片平面法向振动强于平面内振动。铁心B柱振动大于A、C柱，铁心柱与上下铁轭接缝处振动较大，沿铁心柱及上下铁轭振动呈近似“U”型分布，且电压越大，趋势越明显。铁心辐射声场云图及声像图均表明铁心B柱与上下铁轭接缝处的辐射噪声贡献远大于其他位置 ...
纪炜 +4 more
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Bioavailability of different forms of iron to Phaeodactylum tricornutum [PDF]
, 2015 铁是浮游植物进行光合作用和呼吸作用所必需的微量元素，直接参与硝酸盐及亚硝酸盐的还原、氮气的固定、叶绿素的合成等生物化学反应。铁的供应对浮游植物的生物量、生长率、种类组成和初级生产力有着重要影响。20世纪80年代，Martin等人的研究发现，一些海域虽然有足够的氮、磷等营养盐，浮游植物的生物量却很低，在这些海域加入适量的铁盐，能够促进浮游植物的生长。除了铁的浓度，铁的形态也会影响浮游植物的生长。因此，铁的浓度和形态对浮游植物生长的影响以及不同形态铁的生物可利用性，逐渐成为研究的热点。 三角褐指藻 ...
董万礼
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Rare Metals, EarlyView.ABSTRACT The sluggish kinetics of the oxygen reduction reaction (ORR) necessitate developing oxygen electrodes with enhanced electrocatalytic activity for practical zinc–air battery applications. In this study, an iron‐doped copper sulfide electrocatalyst (CuFeNS‐PNC) anchored on metal–organic framework‐derived carbon substrates was designed, featuring
Taichong Chitboonyakasem +4 more
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