Results 41 to 50 of about 833,358 (231)

一种测定酶活性的聚合物液膜电位传感器及其检测方法

, 2010
本发明涉及传感器，具体地说是一种测定酶活性的聚合物液膜电位传感器及其检测方法。电位测定仪通过导线分别连接内参比电极和外参比电极，内参比电极插入盛有内充液的工作电极内，工作电极和外参比电极插入盛有检测液检测池中，工作电极为固定有聚合物敏感膜的电极载体，检测池中设有具有溶液扰动作用的动力装置。测定方法为通过电位测定仪测定酶促反应前后工作电极底部的聚合物敏感膜上的电位变化，根据电位变化信号通过标准工作曲线测得酶活性浓度。本发明通用性强、选择性好、灵敏度高、成本低廉 ...
丁家旺, 秦伟, 王学伟
core  

L2 Chinese Grammatical Acquisition and Processing: A Substantive and Methodological Review

International Journal of Applied Linguistics, EarlyView.
ABSTRACT This study presents a systematic review of 92 empirical studies on Chinese as a second language (CSL) in grammatical processing and development, synthesizing their substantive foci and methodological characteristics. The results reveal consistent scholarly attention to cross‐linguistic topics, with less focus on features that are distinctively
Shaohua Fang, Yi Xu, Jiani He, Jia Wang
wiley   +1 more source

减少H₂O₂干扰测定稳定性ClO₂含量的方法

Gongye shui chuli, 2000
用碘量法测定稳定性ClO2 溶液中的ClO2 含量时,当稳定液中过碳酸盐过量,测定结果会偏高。作者提出将待测样酸化后加入稍过量的K2Cr2O7与其中的H2O2 反应以消除其影响,再用碘量法测定的新方法。方法操作简便,结果可靠,为较准确地检测含过量过碳酸盐的稳定性ClO2 溶液中的ClO2 真实含量提供了新的途径。
车金林, 刘桂祯
doaj   +2 more sources

人血清假性胆碱酯酶连续监测法测定方法学的建立及其在肝功能评价中的应用

Zhongguo shiyan zhenduanxue, 2003
目的　建立一种稳定的人血清假性胆碱酯酶速率测定方法。方法　测定反应的初速度 ,对反应体系的最佳pH、离子强度、底物用量进行选择 ,并对所建立方法的性能 ,包括试剂的稳定性进行评价。结果　采用双试剂连续监测法测定假性胆碱酯酶的活性 ,试剂I的最适组成 :含 0 .2 5mmol/LDNTB的磷酸盐缓冲液 （80mmol/L ,pH 7.7） ;试剂II的最适组成为 :含 6 0mmol/L碘化正丁酰硫代胆碱水溶液。液体试剂于 4℃储存至少可以稳定一年。本法测定线性可达 12 0 0 0U/L ...
杨宏云, 徐国兵, 夏铁安
doaj  

Radiographic identification and description of the equine middle conchal sinus (ethmoidal sinus): Implications for diagnosing middle conchal sinusitis

Equine Veterinary Journal, Volume 58, Issue 6, Page 1627-1635, November 2026.
Abstract Background The middle conchal sinus (MCS) (ethmoidal sinus) remains one of the least understood equine paranasal compartments. Despite recognition of its involvement in sinonasal disease, disorders of the MCS often remain underdiagnosed in the absence of computed tomographic (CT) imaging due to limited anatomical understanding and challenges ...
J.‐B. Pavard, A. Young, M. Robert, D. Verwilghen   +3 more
wiley   +1 more source

重量法检测污水中悬浮物含量的不确定度评定

Gongye shui chuli, 2014
采用重量法对4个不同浓度的实际污水水样的悬浮物含量进行了检测，并根据检测结果进行了测量不确定度的评定。根据实验过程，建立了数学模型，对各个不确定度的来源进行了分析，并计算出各个不同浓度样品的不确定度分量、合成不确定度和扩展不确定度，找到了占支配地位的不确定度分量，从而使检测人员对该方法检测悬浮物含量进行不确定度评定的计算变得简单实用。
曹蕾, 秦孝敏, 张琼尹
doaj   +2 more sources

生物膜活性测定中TTC-脱氢酶活性测定法的改进

, 2005
对生物膜活性测定中氯化三苯基四氮唑(TTC)-脱氢酶活性测定法进行了改进,解决了标准曲线制作稳定性差的问题,对测定中的诸多影响因素进行比较分析,确定了改进后的脱氢酶活性测定的最佳条件.结果表明,以甲苯作为萃取剂的液-液分层明显,提取效果好,操作简便.以硫化钠代替连二亚硫酸钠作还原剂,效果较好,显色稳定不褪色.反应的适宜pH值为8.6,适宜温度为38 ...
李今,吴振斌,贺锋
core  

Physical Model for Quantitative Organization Design on Mechanical Performance of Nanotwin Unit in Face‐Centered Cubic Metal

Rare Metals, Volume 45, Issue 11, November 2026.
ABSTRACT Arranging functional units into a specific organization is a practical structural strategy for achieving fabulous performance, known as the functional unit and organization (FUO) paradigm. This paradigm offers a concise shortcut to establishing structure–performance relationships.
Zhongtao Lu, Xiege Huang, Xiong Zhou, Pengcheng Zhai, Guodong Li, William A. Goddard III   +5 more
wiley   +1 more source

一种便携式土壤呼吸测定气室

, 2008
 本发明公开了一种便携式土壤呼吸测定气室，由底座和测量室组成，底座固定于土壤中，测量室放置在底座上；测量室包括一个中空的壳体，壳体内的顶部中央安装有风扇，壳体内的顶部两侧设有与红外气体分析仪连通的通气嘴，壳体的底部外围有插入底座的环体；底座包括一个圆筒，圆筒的外围设有供测量室插入的水槽，圆筒的底部沿外壁向内径方向制成锥形尖端。本发明的便携式土壤呼吸测定气室，采用底座和测量室分离设置，能够为红外气体分析仪提供分析气体源，从而计算土壤呼吸速率 ...
樊军,齐丽彬
core  

Recent Progress in Predicting Corrosion Evolution and Degradation of Aluminum Alloys by Multiscale Simulation Frameworks

Rare Metals, Volume 45, Issue 11, November 2026.
ABSTRACT As the second most widely used metallic material after steel, research on the corrosion resistance of aluminum (Al) alloys holds great significance. To overcome the inherent limitations of experimental methods in capturing long‐term multifactor corrosion behavior of Al alloys, this review summarizes recent advancements in the multiscale ...
Yue Hou, Xiaopeng Cheng, Shougang Chen, Tao Li   +3 more
wiley   +1 more source