检索结果-南通市图书馆

Preparation of Low Ratio Magnesium Ccement by Acid Leaching Treatment of Boron Mud

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 120-129页

作者： yang Mei ZHANG Mingzhe CHEN Hao School of Materials Science and Engineering Shenyang Jianzhu UniversityShenyang 110168China School of Physical Science and Technology Shenyang Normal UniversityShenyang 110168China

The effects of liquid-solid ratio and reaction time on the leaching rate of magnesium at room temperature were investigated,as well as the effects of the molar ratio of MgO/MgCl_(2),the amount of water added,and the amount of acid-impregnated slag dosed on the compressive strength and water resistance of *** results showed that the magnesium element in the boron mud could be maximally leached under the conditions of 1:1 concentration of hydrochloric acid at room temperature,liquid-solid ratio of 2.5 mL·g^(-1),and reaction time of 5 h,and the main products were amorphous SiO_(2) as well as a small amount of magnesium olivine which had not been completely *** LR-MOC prepared using the acid-soaked mixture could reach a softening coefficient of 0.85 for 28 d of water immersion when the molar ratio of MgO/MgCl_(2) was 2.2,the amount of water added was 0 g,and the acid-soaked slag dosing was 40 wt%,which also led to an appreciable late-strength,with an increase of 19.4%in compressive strength at 28 d compared to that at 7 *** previous studies,LR-MOC prepared in this way has a final strength phase that is not the more easily hydrolysed 3-phase but the lath-like *** this phenomenon,we analyzed the mechanism and found that,during the acid leaching process,a part of amorphous SiO_(2) dissolved in the acid leaching solution formed a silica sol,in which Mg^(2+)played a bridging role to make the silica sol more *** the addition and hydrolysis of MgO,the silica sol gel coagulation slows down,providing a capping layer to inhibit the hydrolysis of the 5-phase crystals and providing some strength after *** amorphous SiO_(2) in the other part of the acid-impregnated slag generated M-S-H gel with Mg^(2+)and OH-,which synergised with the dense structure composed of interlocking crystals to improve the water resistance of LR-MOC.

关键词： boron mud magnesium chloride-oxygen cement acid immersion water resistance silica sol

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

对侧使用助听器对人工耳蜗植入儿童句子识别能力的影响

引用

中国听力语言康复科学杂志 2015年第1期13卷 24-26页

作者：杨影孙喜斌王康崔芳芳杨会会王丽燕南昌大学第二附属医院耳鼻咽喉头颈外科南昌330006 言语听觉科学教育部重点实验室上海200062 中国聋儿康复研究中心北京100029

目的：探讨安静环境和噪声环境下，人工耳蜗植入儿童在电声双模式（对侧使用助听器）和电模式（对侧不使用助听器）助听下的句子识别率差异。方法在安静环境和噪声环境中，分别对12例人工耳蜗植入儿童进行句子识别率测试，比较两种助听... 详细信息

目的：探讨安静环境和噪声环境下，人工耳蜗植入儿童在电声双模式（对侧使用助听器）和电模式（对侧不使用助听器）助听下的句子识别率差异。方法在安静环境和噪声环境中，分别对12例人工耳蜗植入儿童进行句子识别率测试，比较两种助听模式之间的识别率差异。结果在安静环境中，电声双模式助听的人工耳蜗植入儿童句子识别率为77.7%±15.0%，电模式助听下的句子识别率为73.0%±17.2%，两者之间差异显著（P〈0.05）；在噪声环境中，电声双模式助听下的句子识别率为60.8%±24.5%，电模式助听下的句子识别率为54.8%±19.7%，两者之间差异显著（P〈0.05）。结论在安静环境和噪声环境中，电声双模式助听的句子识别率均高于电模式助听的句子识别率。

关键词：听障儿童人工耳蜗安静环境噪声环境句子识别

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

我国企业对作业成本法的理解——基于一项问卷的调查

引用

上海财经大学学报 2004年第1期6卷 61-67页

作者：潘飞童卫华杨慧辉上海财经大学财务与会计研究院上海200433 上海财经大学会计学院上海200433

我国实务界对作业成本法的认识如何,一直是理论界希望了解的问题。本文通过问卷调查的方式,了解了已经实施ABC系统的公司对作业成本法的认识。研究结果表明:理论上先进的ABC思想并没有被实务界主动的接受;企业员工在自身业绩受到ABC不... 详细信息

我国实务界对作业成本法的认识如何,一直是理论界希望了解的问题。本文通过问卷调查的方式,了解了已经实施ABC系统的公司对作业成本法的认识。研究结果表明:理论上先进的ABC思想并没有被实务界主动的接受;企业员工在自身业绩受到ABC不利影响时,会降低对ABC的认同;ABC核算软件的优劣会影响ABC在企业的推行。

关键词：中国企业作业成本法 ABC系统员工核算软件

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A surface engineering strategy for the stabilization of zinc metal anodes with montmorillonite layers toward long-life rechargeable aqueous zinc ion batteries

引用

Journal of Energy Chemistry 2025年第1期100卷 94-105页

作者： Wenbo Wang Ruifeng Xu Xu Zhang Peiyu Wang Bao yang Bingjun yang Juan yang Kailimai Su Pengjun Ma Yanan Deng Xianfeng Fan Wanjun Chen Key Laboratory for Electronic Materials College of Electrical Engineering Northwest Minzu University Resource Chemistry and Energy Materials Research Center State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Institute for Materials and Processes School of Engineering University of Edinburgh

Rechargeable aqueous zinc-ion batteries （AZIBs） exhibit appreciable potential in the domain of electrochemical energy ***,there are serious challenges for AZIBs,for instance zinc dendrite growth,hydrogen evolution reaction （HER）,and corrosion side ***,we propose a surface engineering modification strategy for coating the montmorillonite （MMT） layer onto the surface of the Zn anode to tackle these issues,thereby achieving high cycling stability for rechargeable *** results reveal that the MMT layer on the surface of the Zn anode is able to provide ordered zincophilic channels for zinc ions migration,facilitating the reaction kinetics of zinc *** functional theory（DFT） calculations and water contact angle （CA） tests prove that MMT@Zn anode exhibits superior adsorption capacity for Zn2+and better hydrophobicity than the bare Zn anode,thereby achieving excellent cycling ***,the MMT@Zn||MMT@Zn symmetric cell holds the stable cycling over 5600 h at 0.5 mA cm-2and 0.125 m A h cm-2,even exceeding 1800 h long cycling under harsh conditions of 5 m A cm-2and 1.25 m A h *** MMT@Zn||V2O5full cell reaches over 3000 cycles at 2 A g-1with excellent rate ***,this surface engineering modification strategy for enhancing the electrochemical performance of AZIBs represents a promising application.

关键词： Hydrogen evolution reaction

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

All-parameters Rayleigh wave inversion

引用

Earthquake Engineering and Engineering Vibration 2021年第2期20卷 517-534页

作者： Xiao-hui yang Ka-Veng Yuen State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of MacaoMacao 999078China

Since S-wave velocity of the subsurface is an important parameter in near surface applications,many studies have been conducted for its *** the various methods that use surface waves or body waves,Rayleigh wave inversion is the most *** practice,the densities and P-wave velocities of different layers are usually assumed to be known to avoid ill-posed problems,as they have less influence on the dispersion ***,improper assignment of these two groups of parameters leads to inaccurate estimation of the S-wave velocity *** order to address this problem,the all-parameters Rayleigh wave inversion strategy is proposed in which the S-wave velocities,layer thicknesses,densities and P-wave velocities of different layers are included as the unknown parameters for ***,the transitional Markov Chain Monte Carlo(TMCMC)algorithm is applied for the implementation of all-parameters Rayleigh wave *** simulated example and two real-test applications are demonstrated to verify the capability of the proposed method in the estimation of the S-wave velocity profile,the densities and the P-wave ***,it is verified that the proposed method achieved more accurate S-wave velocity profile estimation than the traditional approach.

关键词： all-parameters Rayleigh wave inversion Bayesian S-wave velocity profile TMCMC algorithm uncertainty quantification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

间二氯苯水解产物中间苯二酚、间氯苯酚含量的测定

引用

江苏工业学院学报 2007年第3期19卷 12-14页

作者：张跃杨慧慧严生虎沈介发刘建武江苏工业学院精细化工研究所江苏常州213164

采用高效液相色谱法测定间二氯苯水解产物中间苯二酚、间氯苯酚的含量,以C18为固定相,V（异丙醇）∶V（水）=80∶20为流动相,检测波长为273 nm。回收率为95.72%-106.84%,相对标准偏差为2.99-5.38（n=7）,测定数据重复性好,灵敏度高,变... 详细信息

采用高效液相色谱法测定间二氯苯水解产物中间苯二酚、间氯苯酚的含量,以C18为固定相,V（异丙醇）∶V（水）=80∶20为流动相,检测波长为273 nm。回收率为95.72%-106.84%,相对标准偏差为2.99-5.38（n=7）,测定数据重复性好,灵敏度高,变异系数满足分析要求。

关键词：高效液相色谱法外标法间苯二酚间氯苯酚

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

间二氯苯水解制备间苯二酚

引用

南京工业大学学报（自然科学版） 2007年第2期29卷 30-33页

作者：杨慧慧张跃严生虎沈介发刘建武江苏工业学院精细化工研究所江苏常州213164

以间二氯苯为原料、La2O3为催化剂,在KOH水溶液中水解生成间苯二酚.在高压反应釜中考察了反应温度、催化剂、pH、物料配比及搅拌速率对反应结果的影响.实验结果表明,间二氯苯水解的适宜工艺条件为:反应温度260℃、反应体系pH为13.4、V(... 详细信息

以间二氯苯为原料、La2O3为催化剂,在KOH水溶液中水解生成间苯二酚.在高压反应釜中考察了反应温度、催化剂、pH、物料配比及搅拌速率对反应结果的影响.实验结果表明,间二氯苯水解的适宜工艺条件为:反应温度260℃、反应体系pH为13.4、V(水)∶V(间二氯苯)=15∶1、搅拌速率为400 r/min.在上述工艺条件下,间二氯苯转化率>70%,间苯二酚收率>20%.

关键词：间苯二酚间二氯苯合成水解

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Stabilization/solidification mechanisms of tin tailings and fuming slag-based geopolymers for different heavy metals

引用

Frontiers of Environmental Science & Engineering 2024年第5期18卷 43-55页

作者： Xian Zhou Zhengfu Zhang hui yang School of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China Kunming Metallurgical Research Institute Co. Ltd.Kunming650031China

Tin mine tailings(TMT)and fuming slag(FS)contain many heavy metals(As,Cr,Cu,Zn and Mn)that cause severe pollution to the ***,geopolymers were prepared using TMT,FS and flue gas desulfurization gypsum(FGDG)to immobilize heavy metals,and their compressive strength and heavy metal leaching toxicity were *** was first determined that T4F5(TMT:FS=4:5)sample exhibited the highest compressive strength(7.83 MPa).T4F5 achieved 95%immobilization efficiency for As and Cr,and nearly 100%for Cu,Zn and Mn,showing good immobilization performance.A series of characterization analyses showed that heavy metal cations can balance the charge in the geopolymer and replace Al in the geopolymer structure to form covalent *** addition,about 2%–20%of heavy metal Fe was immobilized in hydration products,heavy metal hydroxides and non-bridging Si–O and Al–O coordination with silica-aluminate ***_(3)^(3−) was oxidized into AsO_(4)^(3−),which may form Ca–As or Fe–As ***_(2)O_(7)^(2−)was converted to CrO_(4)^(2−)under alkaline environment and then combined with OH−to form Cr(OH)3 ***^(2+)may react directly with dissolved silicate to form Mn_(2)SiO_(4) and also form Mn(OH)_(2) *** unstable Mn(OH)_(2) can be further oxidized to MnO_(2).The heavy metal cations were immobilized in the silicoaluminate lattice,while the anions tended to form insoluble *** results may benefit the industry and government for better handling of TMT,FS and solid wastes containing the abovementioned five heavy metals.

关键词： Heavy metals Cementitious materials Tin tailings Stabilization/solidification Redox

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bayesian Rayleigh wave inversion with an unknown number of layers

引用

Earthquake Engineering and Engineering Vibration 2020年第4期19卷 875-886页

作者： Ka-Veng Yuen Xiao-hui yang State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of Macao999078MacaoChina

Surface wave methods have received much attention due to their efficient, flexible and convenient characteristics. However, there are still critical issues regarding a key step in surface wave inversion. In most existing methods, the number of layers is assumed to be known prior to the process of inversion. However, improper assignment of this parameter leads to erroneous inversion results. A Bayesian nonparametric method for Rayleigh wave inversion is proposed herein to address this problem. In this method, each model class represents a particular number of layers with unknown S-wave velocity and thickness of each layer. As a result, determination of the number of layers is equivalent to selection of the most applicable model class. Regarding each model class, the optimization search of S-wave velocity and thickness of each layer is implemented by using a genetic algorithm. Then, each model class is assessed in view of its efficiency under the Bayesian framework and the most efficient class is selected. Simulated and actual examples verify that the proposed Bayesian nonparametric approach is reliable and efficient for Rayleigh wave inversion, especially for its capability to determine the number of layers.

关键词： Bayesian model class selection generalized r/t coefficients algorithm genetic algorithm inversion of Rayleigh wave number of layers

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Increase in the variability of terrestrial carbon uptake in response to enhanced future ENSO modulation

引用

Atmospheric and Oceanic Science Letters 2025年第1期18卷 32-38页

作者： Younong Li Li Dan Jing Peng Qidong yang Fuqiang yang Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Key Laboratory of Atmospheric Environment and Processes in the Boundary Layer over the Low-Latitude Plateau Region Department of Atmospheric ScienceYunnan UniversityKunmingChina

El Niño-Southern Oscillation(ENSO)is a major driver of climate change in middle and low latitudes and thus strongly influences the terrestrial carbon cycle through land-air *** the ENSO modulation and carbon flux variability are projected to increase in the future,but their connection still needs further *** investigate the impact of future ENSO modulation on carbon flux variability,this study used 10 CMIP6 earth system models to analyze ENSO modulation and carbon flux variability in middle and low latitudes,and their relationship,under different scenarios simulated by CMIP6 *** results show a high consistency in the simulations,with both ENSO modulation and carbon flux variability showing an increasing trend in the *** higher the emissions scenario,especially SSP5-8.5 compared to SSP2-4.5,the greater the increase in *** flux variability in the middle and low latitudes under SSP2-4.5 increases by 30.9%compared to historical levels during 1951-2000,while under SSP5-8.5 it increases by 58.2%.Further analysis suggests that ENSO influences mid-and low-latitude carbon flux variability primarily through *** occurrence may potentially be attributed to the increased responsiveness of gross primary productivity towards regional temperature fluctuations,combined with the intensified influence of ENSO on land surface temperatures.

关键词： Carbon variability ENSO modulation CMIP6 models

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：