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Synthesis and characterization of superhydrophobic magnesium oxysulfate whiskers

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Particuology 2023年第7期78卷 111-121页

作者： Zhenying Yao Lu Gong Chunmei Zhu Xin Lian bai he Shenghui Tian Bo Yui School of Chemistry and Chemical Engineering Chongqing University of Science and TechnologyChongqing401331China Provincial and Ministerial Co-Constructive of Collaborative Innovation Center for MSw Comprehensive Utilization School of Metallurgy and Materials EngineeringChongqing University of Science and TechnologyChongqing401331China

Superhydrophobic materials have attracted much attention for their special wettability.In this study.magnesium oxysulfate(MOS)whiskers were surface modified by vinyltrimethoxysilane(VTMS)and prepared as superhydrophobic materials,which are expected to be widely used in self-cleaning,corro-sion prevention,and oil-water separation.The factors of silane concentration,hydrolysis time,reaction temperature,and reaction time were investigated.The superhydrophobic Mos whiskers were synthe-sized.SEM and XRD turned out that there were no apparent changes in the morphology and crystalli-zation behavior of whiskers before and after modification,while the surface was uniformly coated with a layer of non-crystal material,and the surface of the whiskers employed a chemical bond Si-O-Mg covalently connected.The thermogravimetric analysis ultimately demonstrated that surface modification was beneficial to the improvement of the thermal stability of MoS whiskers.Superhydrophobic MoS whiskers showed good compatibility with organic solvents through oil-water separation experiments,and demonstrated excellent self-cleaning performance.The methodology for the surface treatment of Mos whiskers to prepare superhydrophobic whiskers in this work may be extended for other whiskers or fillers,which may be promising for the preparation of superhydrophobic materials.

关键词： Magnesium oxysulfate whiskers Surface modification Vinyltrimethoxysilane Superhydrophobicity

Change in self-image pressure level before and after autologous fat breast augmentation and its effect on social adaptability

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World Journal of Psychiatry 2024年第6期14卷 920-929页

作者： Jian Li Hui-Min Wang Yang Jiang Zhen-Nan Liu bai-Hui he Department of Plastic Surgery The First Affiliated Hospital of Xinxiang Medical UniversityXinxiang 453100Henan ProvinceChina Department of Otolaryngology The First Affiliated Hospital of Xinxiang Medical UniversityXinxiang 453100Henan ProvinceChina

BACKGROUND There is an increasingly strong demand for appearance and physical beauty in social life,marriage,and other aspects with the development of society and the improvement of material living standards.An increasing number of people have improved their appearance and physical shape through aesthetic plastic surgery.The female breast plays a significant role in physical beauty,and droopy or atrophied breasts can frequently lead to psychological inferiority and lack of confidence in women.This,in turn,can affect their mental health and quality of life.AIM To analyze preoperative and postoperative self-image pressure-level changes of autologous fat breast augmentation patients and their impact on social adaptability.METHODS We selected 160 patients who underwent autologous fat breast augmentation at the First Affiliated Hospital of Xinxiang Medical University from January 2020 to December 2022 using random sampling method.The general information,selfimage pressure level,and social adaptability of the patients were investigated using a basic information survey,body image self-assessment scale,and social adaptability scale.The self-image pressure-level changes and their effects on the social adaptability of patients before and after autologous fat breast augmentation were analyzed.RESULTS We collected 142 valid questionnaires.The single-factor analysis results showed no statistically significant difference in the self-image pressure level and social adaptability score of patients with different ages,marital status,and monthly income.However,there were significant differences in social adaptability among patients with different education levels and employment statuses.The correlation analysis results revealed a significant correlation between the self-image pressure level and social adaptability score before and after surgery.Multiple factors analysis results showed that the degree of concern caused by appearance in selfimage pressure,the degree of possible behavioral intervention,the related distress caused by b

关键词： Autologous fat breast augmentation surgery Self-image stress level Social adaptability Analysis of correlation Structural equation model

黄铁矿型(Fe,Mg)O_(2)H晶体到超离子态相变

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矿物岩石地球化学通报 2024年第2期43卷 319-325,I0003页

作者：胡清扬白承禾北京高压科学研究中心北京100193

地球深部的致密含水矿物可能以超离子态形式存在,其物理化学性质须重点考量。前人研究的黄铁矿型FeO_(2)H从有序晶体向超离子态转变时,H离子突破羟基束缚,在固态晶格中自由移动。然而,FeO_(2)H仅在地球深部少量存在,不能代表下地幔的组... 详细信息

地球深部的致密含水矿物可能以超离子态形式存在,其物理化学性质须重点考量。前人研究的黄铁矿型FeO_(2)H从有序晶体向超离子态转变时,H离子突破羟基束缚,在固态晶格中自由移动。然而,FeO_(2)H仅在地球深部少量存在,不能代表下地幔的组成。本文的研究体系为包含Mg在内的黄铁矿型(Fe,Mg)O_(2)H,它在下地幔深部的温压条件下通过铁方镁石和水的反应生成。通过第一性原理计算发现,它在高于80 GPa和1750 K时发生超离子态相变。超离子态(Mg,Fe)O_(2)H的转变条件与FeO_(2)H类似,但在低温区具有更高的质子扩散系数,因此更可能导致深部电导率异常。(Fe,Mg)O_(2)H比FeO_(2)H在下地幔的分布更为广泛,其物理、化学特征有助于示踪地球深部的水循环。

关键词：深下地幔含水矿物超离子态电导率异常

双轴燃气轮机启动过程的动态建模与参数影响分析

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汽轮机技术 2024年第3期66卷 203-206页

作者：周磊王柏贺中国航发沈阳发动机研究所沈阳110015

为了对高度非线性的双轴燃气轮机启动过程进行模拟,在稳态模型中加入燃机动态方程,研究了燃气轮机启动过程的气动参数变化规律。首先,结合压气机、燃烧室、燃气涡轮、动力涡轮及空气系统等热力学模块,建立了燃气轮机启动过程的稳态工作... 详细信息

为了对高度非线性的双轴燃气轮机启动过程进行模拟,在稳态模型中加入燃机动态方程,研究了燃气轮机启动过程的气动参数变化规律。首先,结合压气机、燃烧室、燃气涡轮、动力涡轮及空气系统等热力学模块,建立了燃气轮机启动过程的稳态工作模型;考虑低转速的部件特性,给出了燃气发生器和动力涡轮的转子动态方程,并利用改进欧拉法进行高效迭代求解,实现燃气轮机从启动到慢车稳定运行的动态仿真模拟。其次,在大气温度288.15K、大气压力101.325kPa的环境条件,以及给定供油规律和启动机功率特性下,分析了燃气发生器转速、动力涡轮转速、排气温度及燃气发生器转子剩余功率等随时间的变化规律。最后,在仿真模型中输入某型双轴燃气轮机的相关数据,开展仿真模型与试验数据的对比分析研究。研究结果表明,仿真结果和试验数据在整体趋势上符合度较好,即该模型具有较高的仿真精度,可以对工程设计、试验起到很好的指导作用。

关键词：燃气轮机启动过程气动参数稳态模型动态建模

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第四代同步辐射光源加速器物理与技术

物理 2024年第2期53卷 71-79页

作者：焦毅白正贺李晓中国科学院高能物理研究所北京100049 中国科学院大学核科学与技术学院北京100049 中国科学技术大学国家同步辐射实验室合肥230029 散裂中子源科学中心东莞523803

同步辐射光源是20世纪应用最广泛的高性能X射线源,已成为物理、化学、能源环境、生物医学、先进材料等领域前沿研究的重要工具。进入21世纪,基于电子储存环的同步辐射光源的发展前沿是第四代同步辐射光源(4GLS)。其采用紧凑型的多弯铁... 详细信息

同步辐射光源是20世纪应用最广泛的高性能X射线源,已成为物理、化学、能源环境、生物医学、先进材料等领域前沿研究的重要工具。进入21世纪,基于电子储存环的同步辐射光源的发展前沿是第四代同步辐射光源(4GLS)。其采用紧凑型的多弯铁消色散结构,可以实现接近甚至达到X射线衍射极限的超低束流发射度,将光源亮度在第三代光源基础上进一步提升2—3个数量级。文章将重点介绍第四代同步辐射光源关键的加速器物理与技术,以及国际范围内第四代同步辐射光源装置的发展情况。

关键词：第四代同步辐射光源多弯铁消色散结构加速器物理与技术

Impact of Clinical Guideline Recommendations on the Application of Coronary Computed Tomographic Angiography in Patients with Suspected Stable Coronary Artery Disease

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Chinese Medical Journal 2016年第2期129卷 135-141页

作者： Jia Zhou Jun-Jie Yang Xia Yang Zhi-Ye Chen bai he Luo-Shan Du Yun-Dai Chen Medical School of Chinese PLA PLA General Hospital Beijing 100853 China Department of Cardiology PLA General Hospital Beijing 100853 China Department of Radioloqy PLA General Hospital Beiiinq 100853 China Department of Cardiology Tianjin Chest Hospital Tianjin 300193 China

Background： Coronary computed tomographic angiography （CCTA） has been widely used in patients who are at intemaediate risk for having stable coronary artery disease （SCAD）, and 2013 European Society of Cardiology Guidelines on the Management of SCAD （2013G） recommended the appropriate application of CCTA. However, 2013G has not been subjected to systematic analyses for subsequent impact on clinical practice. Methods： A total of 5320 patients suspected with SCAD were enrolled and scheduled for CCTA from March 2013 to September 2014. For each patient, pretest probability of SCAD was calculated according to updated Diamond-Forrester model （UDFM）. Appropriate CCTA or appropriate stress test was determined as described in the 2013G. A generalized estimating equation model was used to determine the trends in the half-monthly rate of appropriate CCTA. Results： Overall, only 61.37% of patients received appropriate CCTA, and there was insignificant change over time （P = 0.8701）. The application of CCTA in patients who should have had a stress test accounted for most of the inappropriate CCTA before （22.29%） or after （19.98%） the publication of the 2013G. In all patients or any subgroup, no significant change in the adjusted half-monthly rate of appropriate CCTA was found after the publication of the 2013G （odds ratio, 1.002; 95% confidence interval, 0.982-1.021; P = 0.8678）. Conclusions： These findings suggest that the 2013G have not, to date, been fully incorporated into clinical practice, and the clinical utilization of CCTA remains unreasonable to some extent.

关键词： Clinical Practice Coronary Computed Tomographic Angiography Coronary Artery Disease Guideline Recommendations

Prevalence of coronary artery ectasia in older adults and the relationship with epicardial fat volume by cardiac computed tomography angiography

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Journal of Geriatric Cardiology 2013年第1期10卷 10-15页

作者： Jun-Jie Yang Xia Yang Zhi-Ye Chen Qi Wang bai he Luo-Shan Du Yun-Dai Chen Department of Cardiology Chinese PLA General Hospital 28 Fuxing Road Beijing 100853 China Department of Radiology Chinese PLA General Hospital 28 Fuxing Road Beijing 100853 China

Objective Coronary artery ectasia (CAE) refers to abnormal dilation of coronary artery segments to 1.5 times of adjacent normal ones. Epicardial fat is associated with cardiovascular risk factors. The relationship between CAE and epicardial fat has not yet been investigated. This study aimed to assess the relationship between CAE and epicardial fat volume (EFV) in older people by dual-source computed tomography coronary angiography (CTCA). Methods We prospectively enrolled 1400 older adults who were scheduled for dual-source CTCA. Under reconstruction protocols, patients with abnormal segments 1.5 times larger than the adjacent segments were accepted as CAE. EFV was measured by semi-automated software. Traditional risk factors in CAE patients, as well as the extent of EFV, were analyzed and compared to non-CAE group. Results A total of 885 male and 515 female older patients were enrolled. CAE was identified by univariable analysis in 131 patients and significantly correlated to hypertension, smoking, hyperlipidemia, prior percutaneous coronary intervention and ascending aorta aneurysm. EFV was shown to be significantly higher inCAE patients than patients without ectasia. Inmultivariable analyses, EFV (P = 0.018), hypertension (P here was a significant negative correlation between EFV and Markis classification. Conclusions CAE can be reliably recognized by dual-source CTCA. Epicardial fatmight play a role in etiopathogenesis and progression of CAE, providing a newtarget for treating ectasia.

关键词： Cardiac computed tomography angiography Coronary artery ectasia Epicardial fat

基于回归分析和GA-BP神经网络算法的3D打印件弯曲性能预测

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工程塑料应用 2024年第1期52卷 89-94页

作者：白鹤杨鑫杨瑞琦刘亚明赵峥璇庞瑞何石磊宝鸡职业技术学院机电信息学院陕西宝鸡721013 宝鸡石油钢管有限责任公司钢管研究院陕西宝鸡721008 国家石油天然气管材工程技术研究中心陕西宝鸡721008 宝鸡石油钢管厂职工子弟学校陕西宝鸡721008

为进一步探究熔融沉积成型(FDM)3D打印参数和制件弯曲性能之间的关系,创建合理的FDM 3D打印制件弯曲强度预测模型。根据正交试验L_(16)(4^(5))的设计原则和神经网络算法模型的构建要求,按照不同分层高度、填充密度、打印温度、打印速度... 详细信息

为进一步探究熔融沉积成型(FDM)3D打印参数和制件弯曲性能之间的关系,创建合理的FDM 3D打印制件弯曲强度预测模型。根据正交试验L_(16)(4^(5))的设计原则和神经网络算法模型的构建要求,按照不同分层高度、填充密度、打印温度、打印速度以及外壳厚度五种因素,制备25组试验试样,并进行弯曲性能检测。随后通过建立GA-BP神经网络模型、传统BP神经网络模型以及多元回归方程模型,分别对FDM 3D打印制件弯曲性能进行预测,并将预测数据与试验测试数据进行对比。通过对比发现,GA-BP神经网络模型预测数据与试验测试数据更为接近,其平均误差为3.71%,且误差值整体波动最小,BP神经网络模型与多元回归方程模型预测精度相差不大,BP神经网络模型预测平均误差为8.05%,多元回归方程模型预测平均误差为9.07%,但多元回归方程误差值整体波动最大。因此,采用GA遗传算法优化后的BP神经网络模型在进行FDM 3D打印制件弯曲性能预测方面具有更高的精度和更良好的稳定性。

关键词：回归分析 GA-BP神经网络 3D打印弯曲性能预测

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严重精神障碍患者社区康复效果影响因素分析

中华灾害救援医学 2024年第1期11卷 79-82页

作者：白鹤陈巧珍浙江大学医学院浙江杭州310000 浙江大学医学院附属第二医院精神科浙江杭州310000

目的探讨严重精神障碍患者在社区康复效果的影响因素,为社区精神卫生工作者制定个体化干预方案提供参考,以进一步提高患者康复效果.方法采用多因素logistic回归分析某城区诊断明确的严重精神障碍患者基本情况,以住院次数、社会功能为结... 详细信息

目的探讨严重精神障碍患者在社区康复效果的影响因素,为社区精神卫生工作者制定个体化干预方案提供参考,以进一步提高患者康复效果.方法采用多因素logistic回归分析某城区诊断明确的严重精神障碍患者基本情况,以住院次数、社会功能为结果,分析不同诊断、性别、年龄、监护人关系、随访方式、婚姻、工作状态、合并其他疾病情况与社会功能相关性.结果监护人与患者关系、年龄、婚姻状况、工作状态、医疗待遇、家庭经济状况、起病形式、有无合并慢性病与个人生活料理能力相关;监护人与患者关系、性别、诊断、婚姻状态、文化程度、工作状态与家务劳动能力相关;监护人与患者关系、诊断、婚姻状况、工作状态、家庭经济情况与患者社交参与度和社交能力相关;起病情况和主诊断性质与生产劳动和工作能力相关.结论患者社会功能的社区康复受多种因素影响,不同社会功能水平受不同因素影响,分析患者功能水平和资源,如患者监护人的关系、文化程度、医疗待遇和危险因素如年龄、婚姻状态、服药情况等,能够更有针对性制定患者康复方案或者个体化治疗方案,发挥保护因素,纠正危险因素,提高患者社区康复效果.

关键词：精神病社区康复