检索结果-南通市图书馆

Thiourea crystal growth kinetics,mechanism and process optimization during cooling crystallization

Chinese Journal of Chemical Engineering 2024年第9期73卷 62-69页

作者： Zhongxiang Ding Wei Song Tong Zhou Weihua Cui changsong wang State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 211816China Yifeng New Material Co. Ltd.Binzhou 256600China

In the cooling crystallization process of thiourea,a significant issue is the excessively wide crystal size distribution(CSD)and the abundance of fine *** investigation delves into the growth kinetics and mechanisms governing thiourea crystals during the cooling crystallization *** fitting results indicate that the crystal growth rate coefficient,falls within the range of 10^(-7)to 10^(-8)m·s^(-1).Moreover,with decreasing crystallization temperature,the growth process undergoes a transition from diffusion-controlled to surface reaction-controlled,with temperature primarily influencing the surface reaction process and having a limited impact on the diffusion *** the crystal growth rate,and the diffusion-limited growth rate,at different temperatures,it is observed that the crystal growth process can be broadly divided into two *** temperatures above 25℃,1/qd(qd is diffusion control index)approaches 1,indicating the predominance of diffusion ***,at temperatures below 25℃,1/qd increases rapidly,signifying the dominance of surface reaction *** address these findings,process optimization was *** the high-temperature phase(35-25℃),agitation was increased to reduce the limitations posed by bulk-phase diffusion in the crystallization *** the low-temperature phase(25-15℃),agitation was reduced to minimize crystal *** optimized process resulted in a thiourea crystal product with a particle size distribution predominantly ranging from 0.7 to 0.9 mm,accounting for 84%of the *** study provides valuable insights into resolving the issue of excessive fine crystals in the thiourea crystallization process.

关键词： Thiourea Crystallization Growth kinetics Process optimization Diffusion Surface reaction

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

Effect of Guizhi Gancao Longgu Muli Tang on sleep disturbances in menopausal women

引用

Journal of Traditional Chinese Medicine 2017年第1期37卷 23-29页

作者： wang Zhipeng Ke Deng Huang Xiaoqin Ding Yang wang changsong Traditional Chinese Medicine Department of Internal Medicine Zhongda Hospital affiliated to Southeast UniversityNanjing 210009China internal Medicine Department of Traditional Chinese Medicine Medicine School of Southeast UniversityNanjing 210009China Outpatient Department Hospital of Nanjing University of Posts and TelecommunicationsNanjing 210023China

OBJECTIVE: To evaluate the effect of Guizhi Gancao Longgu Muli Tang(GGLMT), a decoction prepared with herbal medicine of Traditional Chinese Medicine, on sleep disturbances in women with ***: Totally 162 participants were recruited for the treatment of sleep difficulty from February,2012 to December, 2014. Decoction of 200 mL was taken by every participant twice daily in half an hour after lunch and dinner during two *** quality was assessed by Pittsburg sleep quali-ty index(PSQI) and menopausal symptoms and quality of life were evaluated by the menopause rating scale(MRS) and the Chinese version of World Health Organization quality of life-BREF at the final fellow-up in the fourth weekend after ***: The average scores of PSQI had reduced from(13.82 ± 4.97) to(8.14 ± 3.19), 95% CI(- 4.87,- 3.05) after 2-week GGLMT treatment in the fourth week. GGLMT improved symptoms in patients with more severe conditions(MRS ≥ 16).Three adverse drug reaction, mouth ulcer, constipation, and folliculitis, might be related with GGLMT and disappeared after withdrawals of the ***: For menopausal women suffering from chronic sleep disturbances, our findings suggest that two weeks treatment of GGLMT was safe and effective.

关键词： Menopause Quality of life Sleep disturbances Medicine, Chinese traditional Guizhi Gancao Longgu Mull Tang

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

Continuous on-line adaptation of the rotor time constant in FOC induction machine system

引用

High Technology Letters 2013年第3期19卷 254-260页

作者：齐昕 Ma Xianghua wang changsong Xi Anmin School of Mechanical Engineering University of Science and Technology Beijing

Rotor time constant is an important parameter for the indirect lleld oraentateO control of mauc- tion motor. Incorrect rotor tittle constant value will cause the flux observer generating a wrong angu- lar orientation of the rotor field. A new approach serves for rotor time constant on-line adaptation by setting the stator current to be zero for a short period. A smooth eorrector is designed to prevent ab- normal detection result from making adaptation. Impact of zero current duration on detection error and rotor speed is analyzed by experiments.

关键词： rotor time constant field oriented control (FOC) on-line adaptation inductionmotor

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

Determination of the metastable zone and induction time of thiourea for cooling crystallization

引用

Chinese Journal of Chemical Engineering 2021年第3期34卷 164-168页

作者： Tong Zhou Chunzhao Tu Ya Sun Linan Ji Chuangxian Bian Xiaohua Lu changsong wang State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

The solubility,metastable zone width(MSZW),and induction time of thiourea for cooling crystallization were experimentally determined in the temperature range of 283-323 *** solubility data could be well described by the Apelblat equation model as lnx=-99.55+1071.66/T+16.27 *** determinations of the effects of various stirring and cooling rates indicated that the MSZW increased with increasing and decreasing cooling and stirring rates,***,the induction times at various temperatures and supersaturation ratios were also *** results indicated that homogeneous nucleation could occur at high supersaturation,whereas heterogeneous nucleation was more likely to occur at low *** on the classical nucleation theory and induction period data,the calculated solid-liquid interfacial tensions of thiourea in deionized water at 302.46 and 312.58 K were 2.86 and 2.94 mJ·m^(-2),respectively.

关键词： Thiourea Metastable zone Induction time Cooling crystallization

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

Effects of heavy metal ions Cu^(2+)/Pb^(2+)/Zn^(2+)on kinetic rate constants of struvite crystallization

引用

Chinese Journal of Chemical Engineering 2023年第5期57卷 10-16页

作者： Guangyuan Chen Tong Zhou Meng Zhang Zhongxiang Ding Zhikun Zhou Yuanhui Ji Haiying Tang changsong wang State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 211816China Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing 211189China Qinghai Salt Lake Yuantong Potash Fertilizer Co. Ltd.Golmud 816000China

Struvite(MAP)crystallization technology is widely used to treat ammonia nitrogen in waste effluents of its simple operation and good removal ***,the presence of heavy metal ions in the waste effluents causes problems such as slow crystallization rate and small crystal size,limiting the recovery rate and economic value of the *** present study was conducted to investigate the effects of concentrations of three heavy metal ions(Cu^(2+),Zn^(2+),and Pb^(2+))on the crystal morphology,crystal size,average growth rate,and crystallization kinetics of MAP.A relationship was established between the kinetic rate constant Ktcalculated by the chemical gradient model and the concentrations of heavy metal *** results showed that low concentrations of heavy metal ions in the solution created pits on the MAP surface,and high level of heavy metal ions generated flocs on the MAP surface,which were composed of metal hydroxides,thus inhibiting crystal *** crystal size,average growth rate,MAP crystallization rate,and kinetic rate constant Ktdecreased with the increase in heavy metal ion ***,the Ktdemonstrated a linear relationship with the heavy metal concentration ln(C/C~*),which provided a reference for the optimization of the MAP crystallization process in the presence of heavy metal ions.

关键词： Struvite Crystallization Heavy metal ions Kinetics Kinetic modeling Kinetic rate constant

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

On and Off the Water

引用

Beijing Review 2013年第32期56卷 28-29页

作者： wang changsong

The 14th Chinese naval escort flotilla has been patrolling the Gulf of Aden since eady March. On the sidelines of ongoing escort operations, sailors busy themselves with combat training and a variety of exchange activ... 详细信息

关键词：闭水中国海军交流活动作战训练海军部队

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

Role and mechanism of Shenlingkangai formula on reversing anoikis resistance of gastric cancer cells by regulating Bim expression via PI3K/AKT pathway

引用

China Medical Abstracts(Internal Medicine) 2021年第3期38卷 138-139页

作者： wang changsong TCM Coll Fujian TCM UnivFuzhou 350122

Objective To study the role of Shenlingkangai For-mula(SLKAF)on reversing anoikis resistance of gastric cancer cells,and explore its mechanism based on phosphatidylinositol 3 kinase/protein kinase B(PI3K/AKT)signal tr... 详细信息

关键词： PI3K/AKT expression. gastric

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

Clinical characteristics of 310 SARS-CoV-2 Omicron variant patients and comparison with Delta and Beta variant patients in China

引用

Virologica Sinica 2022年第5期37卷 704-715页

作者： Wei Yang Songliu Yang Lei wang Yuxin Zhou Yu Xin Hongxu Li Wenjing Mu Qi Wu Lei Xu Mingyan Zhao changsong wang Kaijiang Yu Department of Critical Care Medicine The First Affiliated Hospital of Harbin Medical UniversityHarbin 150001China Department of Critical Care Medicine The Cancer Hospital of Harbin Medical UniversityHarbin 150081China Respiratory Department Haihe Hospital of TianjinTianjin 300222China Department of Critical Care Medicine Tianjin Third Central HospitalTianjin 300170China

Although the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)Omicron variant has spread,data on the clinical characteristics of infected patients are *** this study,the demographic,clinical characteristics,and laboratory data of 310 SARS-CoV-2 Omicron variant patients treated at Haihe Hospital of Tianjin were collected and *** on these patients was compared to 96 patients with the Delta variant of concern(VOC)and 326 patients with the Beta VOC during the previous coronavirus disease 2019(COVID-19)outbreak in *** the 310 patients infected with the Omicron variant,the median age was 35 *** patients were clinically classified as mild(57.74%),and the most common symptoms were cough(48.71%),fever(39.35%),and sore throat(38.26%).The results for different vaccination groups in the Omicron group showed that the median of“SARS-CoV-2 specific IgG”after 2 or 3 doses of vaccination was higher than the unvaccinated group(all Ps<0.05).Older age was associated with a higher proportion of moderate cases and lower asymptomatic and mild cases based on clinical *** to the Delta and Beta groups,the median age of the Omicron group was *** total number of asymptomatic patients and mild patients in the Omicron virus group was higher than the Delta and Beta groups(60.97%vs.54.17%vs.47.55%).This study presented the clinical characteristics of the first group of patients infected with the Omicron variant in Tianjin,China,and compared their clinical features with patients infected by the Delta and Beta variants,which would increase our understanding of the characteristics of SARS-CoV-2 Omicron variant.

关键词： SARS-CoV-2 Omicron Clinical features Vaccine Age Disease severity

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 Study on Representations of Youth in Chinese （Mainland） Youth Cinema

引用

Sociology Study 2012年第6期2卷 437-444页

作者： changsong wang Yiming Chen Rohani Hashim Universiti Sains Malaysia Malaysia Jinan University China

This study＇s objective is to thoroughly analyze representations of teenage sexuality portrayed in two Chinese youths＇ films, which represent social, cultural, and historical diversities in China's Mainland, as well, to unfold some particular natures and trends of Chinese youth cinema in the context of globalization and internationalization. Content analysis and methodology of narrative explore the ideological nature of representations of youth as well as the interpretation of trends in Chinese youth cinema. This study argues the particular manners of representations of Chinese youth in the youths＇ films produced in China's Mainland, through distinct elements such as film properties, film discourse, and acting on set It will explain how functional and social category diversity, cultural diversity, and historical diversity derive the actuality in Chinese communities, and center on a series of sex-based issues that revel correlations between Chinese youths＇ ideology, psychology, and social construction. Including a discussion of technical factors, it defines the specific natures of Chinese youth cinema in the region based on fixed parameters of culture or ancestry that convey rhetorical messages to discover the characteristics of genre film so that the interpretation of the term ＂peers groups＂ represents the values and beliefs in modern Chinese society, thus presenting the exchange approaches which construct and validate the relationship among society, global film industry, young audience and film content.

关键词： Chinese youth youth cinema sexual representations youth socialisation People's Republic of China

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

Effect of Deformation between Stands on the Strip Shape in Hot Rolling

引用

International Journal of Minerals,Metallurgy and Materials 2000年第3期14卷 222-224页

作者： Qinghai Wu, Jie Zhang, changsong wang, Gangcheng Wei, Ping Song, Changhe Deng ( Mechanical Engineering School, University of Science and Technology Beijing, Beijing 100083, China Wuhan Iron & Steel Corporation) Mechanical Engineering School University of Science and Technology Beijing Beijing 100083 China Wuhan Iron and Steel Corporation China

A theoretical model about the secondary deformation is developed by the combination of analytical and experimental approaches. A system simulation based on the model is completed to predict the strip profile after the interstand deformation. On the other hand, comprehensive experiments and quantitative comparisons are made to calibrate the model for a wide variety of products. As a result, the correction of the model has been verified by the actual rolling data from production mill and it is helpful to improve the strip shape control.

关键词： hot rolling strip shape secondary deformation

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

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：