Results 1 to 10 of about 5,590 (101)
Gongye shui chuli, 2023 研究了不同回流速率和Ca2+浓度在流化床反应器中对结垢过程碳酸钙（CaCO3）晶型的影响因素及相关机制。结果表明，流化床水力扰动可以阻止结晶前驱物向稳定相方解石转变。Ca2+质量浓度为2 000 mg/L时，回流速率提升促进非稳定相球状霰石和文石增长，最高占比可达90%以上（10 m/h），控制CaCO3结晶终止于亚稳阶段。回流速率为8 m/h时，Ca2+浓度升高利于非稳定相玫瑰状及球状霰石生成，霰石含量可达90%以上，证明高钙浓度利于抑制霰石向方解石转变，形成有效阻垢。
刘晓吉 +4 more
doaj +2 more sources
Gongye shui chuli, 2023 我国石油与石油化工产业规模已稳居世界第二，是最大的工业废水来源。环烷酸（通式CnH2n+zOx）来自于原油中的酸性含氧化合物，是石油石化废水特有的一类高毒性难降解化合物，《石油化学工业污染物排放标准》（GB 31571—2015）对其最高排放浓度进行了专门限定。对环烷酸类污染物的高效去除一直是水污染控制领域重要的科研方向与工程热点。综述了近十年来国内外关于石油石化废水环烷酸去除方法及机理的研究进展，对环烷酸在强化分离（混凝和吸附）以及强化化学转化（高级氧化和生物降解）过程中的作用机制进行了归纳总结 ...
王庆宏 +6 more
doaj +2 more sources
Zhejiang Daxue xuebao. Lixue ban, 2007 采用两亲嵌段共聚物聚丙烯酸-苯乙烯(PS-b-PAA)水溶液为介质合成了球形碳酸钙复合物，球形直径约3~4 µm，由纳米级方解石微粒通过PS-b-PAA的有机键合紧密团聚而成.通过电镜、XRD、IR和差热热重分析复合物的微晶结构性质表明，复合物中有机质质量分数约为14%；其中的方解石微晶约几十纳米，较之普通碳酸钙晶体有更大的晶格畸变；热分解行为提前约15 ℃，红外v3吸收蓝移约10 cm-1.
JINYi-ping(金一平) +2 more
doaj +1 more source
Gongye shui chuli, 2005 利用时间延迟摄像显微镜(TLVM)系统,研究了磁处理对碳酸钙过饱和溶液析出晶型的影响。结果表明,磁处理增加了溶液中文石生成的几率,沉淀中文石浓度增多,方解石成分减少。在整个TLVM实时观测过程中,未发现任何的晶型间的转变。流速对磁处理效果影响的研究表明,存在最佳流速,在该流速下,过饱和溶液析出物中几乎全为文石和少量的球霰石,而没有方解石的成分,从而形成软垢,达到最佳的阻垢效果。
朱国栋 +4 more
doaj +2 more sources
Gongye shui chuli, 2023 针对石墨炉原子吸收分光光度法测定高参数机组水汽中小于5.0 μg/L痕量铁存在的稳定性较差、空白值高的问题，从石墨炉工作状态、试剂空白、水样消解处理方式等方面进行深入考察。结果指出在标准工作曲线测定前、后均应进行试剂空白值及其重复性的测定以消除炉管残留及进样针带来的误差，当空白吸光度小于0.02、标准偏差小于0.1%时，对痕量铁测定影响不大；石墨管的损耗会降低检测灵敏度和重现性，石墨管使用次数宜控制在800次以下；采用水样酸化静置至少6 h后直接测定并与加热消解法测定值进行了对比，偏差在±0.50 μg/
星成霞 +3 more
doaj +2 more sources
Gongye shui chuli, 2016 采用自制的双通道工业循环冷却水分析实验台和磁电协同式工业循环冷却水阻垢处理器对火电厂循环冷却水进行了动态模拟阻垢实验研究。通过正交实验,优化了影响阻垢率的实验参数;通过对换热铜管表面的CaCO3水垢晶体所进行的SEM和XRD分析,研究了经电磁场协同处理后,水垢晶体中文石和方解石含量的变化。研究表明,在脉冲方波占空比为70%,脉冲方波频率为100 Hz,水流速度为0.870 m/s,离子棒电压为5 kV时,在动态模拟实验运行30 h后,阻垢率可达78.23%。经最佳方案组处理后的方解石晶体的生长受到抑制 ...
杨星 +6 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Magnetic particles coated with carbon shells have been considered as promising electromagnetic wave absorption materials with antibacterial features. However, how to precisely control the monodispersed magnetic nanoparticles on a carbon matrix to manipulate impedance matching and antibacterial performances is still a key challenge.
Xiaofei Li +10 more
wiley +1 more source
Tracing change in the public perception of plants: insights from archives and social media in China
PLANTS, PEOPLE, PLANET, Volume 8, Issue 5, Page 1853-1871, September 2026.As urbanization accelerates, historic gardens serve as vital cultural treasures that offer spiritual and cultural support to the public. This study proposes an innovative approach that merges historical records from the Qing Dynasty with contemporary social media data to explore changes in public perceptions of these gardens.
Dong Xu +4 more
wiley +1 more source
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Magnesium hydride (MgH2) is a promising solid‐state hydrogen storage material due to its high gravimetric capacity and excellent reversibility. However, its practical application is hindered by high thermodynamic stability and sluggish reaction kinetics.
Xingyang Chen +6 more
wiley +1 more source
Reconstructing Old Chinese *‐ts Using Han‐Time Material
Transactions of the Philological Society, Volume 124, Issue 2, Page 487-512, July 2026.Abstract Baxter & Sagart (2014b) reconstruct *‐Vt‐s on the basis of Middle Chinese reflexes in ‐jH (from some OC *‐s) coupled with either etymological or graphic connections to words in Middle Chinese ‐t. This approach, while perfectly sound, can suffer from lack of etymological or graphic data, leading to missed reconstructions. Since Old Chinese *‐ts
Julien Baley
wiley +1 more source