检索结果-南通市图书馆

Clinicopathological differences between patients with schistosomal appendicitis and non schistosomal appendicitis:A retrospectively study of past ten years

引用

World Journal of Clinical Cases 2025年第2期13卷 24-32页

作者： Xiao-Yi Wang yao hao Zi-Jian Wang Xiu-Liang Xu Jiang-Hua Yang Department of Infectious Diseases The First Affiliated of Wannan Medical CollegeWuhu 241001Anhui ProvinceChina

BACKGROUND Chronic schistosomiasis causes multiple organ and multiple system diseases,especially the digestive *** eggs are mainly deposited in the stomach,liver and colorectal,but a few eggs are deposited in the appendix and cause *** present,there are few studies on schistosomal *** To explore the differences in epidemiological,clinical and pathological characteristics between schistosomal appendicitis and non-schistosomal appendicitis over the past decade in order to assess the impact of schistosomiasis on *** The differences of general data,clinical data and laboratory examination data of patients with appendicitis from October 2013 to October 2023 were retrospectively *** patients were divided into two groups for *** were 136 patients in schistosomal appendicitis group and 5418 patients in non-schistosomal appendicitis *** Schistosomal appendicitis accounted for 2.45%of all patients with appendicitis,and the annual proportion in the past decade was 2.2%,2.9%,1.8%,1.9%,3.4%,3.1%,1.9%,1.6%,3%,2.6%,*** prevalence of schistosomal appendicitis was middle-aged and elderly males,with an average age of 61.73±15.335 *** main population of non-schistosomal appendicitis was middle-aged men,with an average age of 35.8±24.013 years(P<0.001).The distribution of pathological types of appendicitis was different between the two groups(P<0.001).The incidence of acute suppurative appendicitis in non-schistosomal appendicitis was higher than that in schistosomal appendicitis[odds ratio(OR)=0.504;95%confidence interval(CI):0.349-0.728;P<0.001].The proportion of acute attack of chronic appendicitis in schistosomal appendicitis was higher than that in non-schistosomal appendicitis(OR=2.614;95%CI:1.815-3.763;P<0.001).The proportion of schistosomal appendicitis patients complicated with colorectal cancer was higher than that of nonschistosomal appendicitis patients(OR=5.087;95%CI:1.427-

关键词： Schistosomal appendicitis Schistosomiasis Appendix Colorectal cancer Clinicopathological characteristics

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

Degradation of refractory pollutants by hydrodynamic cavitation: Key parameters to degradation rates

引用

Journal of Hydrodynamics 2019年第4期31卷 848-856页

作者： Zhi-yong Dong Kai Zhang Rui-hao yao College of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou 310023 China

Degradations of refractory pollutants by hydrodynamic cavitation were experimentally carried out in a self-developed hydrodynamic cavitation reactor with Venturi tubes, multi-orifice plates and their combinations. Effects of hydraulic elements of cavitation due to the Venturi tube on degradation of refractory hydrophobic pollutant were studied, and an optimal throat length corresponding to the maximum degradation rate was obtained. Effects of cavitation due to number, size and distribution of orifice for the multi-orifice plates on degradation of refractory hydrophilic pollutant were investigated, and comparisons and analyses were made. Effects of cavitation due to different combinations of the Venturi tubes with the triangular multi-orifice plates on degradation of hydrophilic and hydrophobic mixtures were studied, and an appropriate combination was determined. Also, effects of cavitation duration, pH value and initial concentration on the refractory pollutants were explored.

关键词： Hydrodynamic cavitation Venturi tube multi-orifice plate refractory pollutant combination effect

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

Hot deformation behavior of uniform fine-grained GH4720Li alloy based on its processing map

引用

International Journal of Minerals,Metallurgy and Materials 2016年第1期23卷 83-91页

作者： Qiu-ying Yu Zhi-hao yao Jian-xin Dong Beijing Institute of Aeronautical Materials Beijing 100095 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The hot deformation behavior of uniform fine-grained GH4720Li alloy was studied in the temperature range from 1040 to 1130℃ and the strain-rate range from 0.005 to 0.5 s-1 using hot compression testing. Processing maps were constructed on the basis of compression data and a dynamic materials model. Considerable flow softening associated with superplasticity was observed at strain rates of 0.01 s 1 or lower. According to the processing map and observations of the microstructure, the uniform fine-grained microstructure remains intact at 1100℃ or lower because of easily activated dynamic recrystallization （DRX）, whereas obvious grain growth is observed at 1130℃. Metal- lurgical instabilities in the form of non-uniform microstrucmres under higher and lower Zener-Hollomon parameters are induced by local plastic flow and primary γ＇ local faster dissolution, respectively. The optimum processing conditions at all of the investigated strains are pro- posed as 1090-1130℃ with 0.084）.5 s-1 and 0.0054）.008 s-1 and 1040-1085℃ with 0.0054）.06 s-1.

关键词： superalloys hot deformation processing maps microstrucmre superplasticity

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

“Screening”or“Meritocracy”:Does the Choice of a Private School Help Students Achieve Higher Academic Performance?-Based on the PISA 2018 Analysis of Four Provinces and Municipalities in China

引用

Frontiers of Education in China 2022年第2期17卷 181-206页

作者： yao hao ZHANG Ying Institute of Higher Education Tongji UniversityShanghai 200092China

The introduced policy of“synchronized enrollment of public and private schools”has once again triggered the debate on the effectiveness of public and private *** on the data of the Program for International Student Assessment(PISA)2018 from four Chinese provinces and municipalities,this paper explores whether private schools gain a relative advantage in student academic performance through student“screening”or academic“meritocracy,”through a hierarchical linear model(HLM)and an empirical test of the propensity score matching(PSM).It has been found that the academic performance of students in private schools is significantly better than that in public *** with background,metacognitive ability,and learning hours of students in private schools controlled for,such academic performance is not significantly superior,suggesting that private schools rely heavily on student“screening”to achieve a relative advantage in student academic *** finding has also verified the scientific nature of the above policy.

关键词： private education synchronized enrollment of public and private schools student academic performance family background Program for International Student Assessment(PISA)

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

Pressure characteristics of hydrodynamic cavitation reactor due to the combination of Venturi tubes with multi-orifice plates

引用

Journal of Hydrodynamics 2018年第3期30卷 514-521页

作者： Kai Zhang Zhi-yong Dong Rui-hao yao Research Institute of Hydraulic and Municipal Engineering Zhejiang University of Technology Hangzhou 310014 China

The pressure characteristics in the throats of Venturi tube and behind triangular multi-orifice plates were experimentally investigated by a pressure data acquisition system of SINOCERA-YE6263, and the effect of throat length of Venturi tube, different geometric parameters of multi-orifice plate and their combinations on the time-averaged pressure, cavitation number, and pressure frequency spectrum, correlation function calculated by FFT were analyzed. The experimental results showed that the throat length of L/R= 40 made for improving the fluctuation energy and promoting the uniform energy distribution, appropriately decreasing the size and increasing the number of orifice could accelerate the uniform distribution of the fluctuation energy in frequency domain. In the combination reactors, the cavitation number behind multi-orifice plates was lower and the fluctuation of correlation function was more intense.

关键词： Hydrodynamic cavitation Venturi tube triangular multi-orifice plate pressure characteristics frequency spectrum correlation function

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

Mechanism of high-temperature oxidation effects in fatigue crack propagation and fracture mode for FGH97 superalloy

引用

Rare Metals 2019年第7期38卷 642-652页

作者： Chao Xu Zhi-hao yao Jian-Xin Dong Yu-Kun Jiang School of Materials Science and Engineering University of Science and Technology Beijing

The high-temperature fatigue crack growth behaviors in powder metallurgy (P/M) Ni-based superalloy FGH97 for turbine disk application were investigated at different temperatures (650, 700 and 800℃) in air using a combination a servohydraulic test system, fractographic and microanalytical investigations. It is found that there is a temperature-sensitive region in which the fatigue life of FGH97 alloy decreases sharply. To further evaluate the crack propagation mode and oxidation effects, interruption experiments were conducted at 700 and 300℃, respectively. The results indicate that the reduction of the fatigue lifetime for FGH97 takes place when the fracture mechanism transforms from a predominantly transgranular mode to an intergranular one as the temperature increases. Although the microstructures and mechanical properties may vary with the temperature, they are not the dominating factors contributing to the temperature sensitivity of fatigue property for FGH97. It is the oxidation that governs the fatigue crack growth behaviors in air at elevated temperature. The enhanced thermal activity of oxygen and certain active metal elements result in accelerated oxidation reaction. The brittle oxide intrusions formed at the crack tip and grain boundaries of crack frontier lead to grain boundary weakness, which is responsible for the transformation of crack growth mode and degradation of the fatigue property of FGH97 alloy.

关键词： FGH97 Fatigue crack growth Temperature sensitivity Fracture mode Oxidation

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

Associations of Time Spent on Study and Sleep with Anxiety and Depressive Symptoms in Junior High School Students:Report from the Large-Scale Monitoring of Basic Education Data in China

引用

International Journal of Mental Health Promotion 2023年第9期25卷 1053-1065页

作者： hao yao Shuzhen Chen Institute of Higher Education Tongji UniversityShanghai200092China Faculty of Education East China Normal UniversityShanghai200062China

In the context of the COVID-19 pandemic and under the pressure of high competitiveness for higher education in China,junior high school students’mental health is facing greater *** the time allocation of study and sleep is necessary for developing effective prevention and treatment *** on a survey of 31,057 junior high school students in 47 junior high schools in Gansu Province,China's Mainland,the study analyzed the associations of time spent on study and sleep with anxiety and depressive symptoms among junior high school students through chi-square test,ANOVA,logistic regression model and threshold regression *** was found that 18.4%–21.1%of junior high school students had mild and above anxiety and depressive *** junior high school students were more likely to have anxiety and depressive *** addition,time spent on study was significantly and positively associated with anxiety and depressive symptoms and time spent on sleep was significantly and negatively associated with anxiety and depressive *** sleepers were more likely to suffer from anxiety and depressive *** after-school study time appropriately and getting more sleep are beneficial in reducing anxiety and depression,but it is more important to ensure time of *** the reduction of anxiety and depressive symptoms,the maximum time spent on study after school should not exceed 1.92 h,the minimum time spent on sleep at night should be more than 7 h and a 40-min lunch break should be guaranteed at noon.

关键词： Time spent on study time spent on sleep anxiety and depressive symptoms threshold regression

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

Plate-like carbon-supported Fe_(3)C nanoparticles with superior electrochemical performance

引用

Rare Metals 2021年第6期40卷 1402-1411页

作者： Chuan Chen Sen Qian Tian-hao yao Jing-Hong Guo Hong-Kang Wang Electric Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory Future Science ParkBeijing 102209China Department of Electric Power Sensing Technology Future Science ParkGlobal Energy Interconnection Research Institute Co.LtdBeijing 102209China School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Iron-based anodes for lithium-ion batteries(LIBs)with higher theoretical capacity,natural abundance and cheapness have received considerable attention,but they still suffer from the fast capacity *** address this issue,we report a facile synthesis of plate-like carbonsupported Fe_(3)C nanoparticles through chemical blowing/carbonization under *** ultrafine Fe_(3)C nanoparticles are prone to be oxidized when exposing in air;thus,Fe_(3)C/C with mild oxidization and the fully oxidized product of Fe_(2)O_(3)/C are successfully prepared by controlling the oxidization *** applied as an anode material in LIB,the Fe_(3)C/C electrode demonstrates excellent cycle stability(826 mAh·g^(-1)after 120 cycles under 500 mA·g^(-1))and rate performance(410.6 mAh·g^(-1) under 2 A·g^(-1)),compared with the Fe_(2)O_(3)/C *** enhanced electrochemical performance can be ascribed to the synergetic effect of the Fe_(3)C with mild oxidation and the unique hierarchical structure of plate-like carbon decorated with Fe_(3)C *** importantly,this work may offer new approaches to synthesize other transition metal(e.g.,Co,Ni)-based anode material by replacing the precursor ingredient.

关键词： Lithium-ion batteries Fe_(3)C Mild oxidation Anode material Lithium storage

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

Hot corrosion behavior and mechanism of FGH96 P/M superalloy in molten NaCl–Na_2SO_4 salts

引用

Rare Metals 2019年第2期38卷 173-180页

作者： He Jiang Jian-Xin Dong Mai-Cang Zhang Lei Zheng Zhi-hao yao Materials Science and Engineering University of Science and Technology Beijing

Hot corrosion behavior of FGH96 powder metallurgy(P/M) superalloy in 25 % NaCl + 75 % Na_2SO_4 molten salts at 650, 700, and 750 ℃ was investigated in this paper. The methods of mass loss measurement, X-ray diffraction(XRD), scanning electron microscopy(SEM),and energy-dispersive spectroscopy(EDS) were used *** experimental results show that hot corrosion kinetics follows a square power law at 650 ℃, while a linear one at 700 and 750 ℃. The corrosion layer is detected to be composed of Cr_2O_3, NiO, and Ni2S_3 at each *** cross-sectional morphologies and corresponding elemental maps indicate that the corrosion layer is a stratified structure of oxide and sulfide. The results and analyses confirm that the hot corrosion mechanism of FGH96 P/M superalloy is a cooperate process of oxidation and sulfidation. Furthermore, the relatively higher concentrations of Cr, Co, and Ti provide better corrosion resistance to the attack of S and Cl^-.

关键词： Nickel-based superalloy FGH96 Hot corrosion Molten salts

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

Microstructure and homogenization process of as-cast GH4169D alloy for novel turbine disk

引用

International Journal of Minerals,Metallurgy and Materials 2019年第7期26卷 889-900页

作者： Kai Chen Shu-yuan Rui Fa Wang Jian-xin Dong Zhi-hao yao School of Materials Science and Engineering University of Science and Technology Beijing

To investigate the microstructure, segregation, and suitable homogenization process of as-cast GH4169D alloy, the microstructure, elements segregation, and precipitates of cast GH4169D ingots prepared by vacuum induction melting (VIM) and vacuum arc remelting (VAR) were observed by optical microscopy (OM), scanning electron microscopy, and energy-dispersive X-ray spectroscopy (EDS). According to the residual segregation model and simulation results of DICTRA thermodynamic software, the homogenization temperature and time range were set as 1120–1170°C and 5–20 h, respectively. The experimental results showed that microscopic dendrite and element segregation occurred in the interior of ingots and the main segregation elements were Nb and Ti. In addition, the precipitates were mainly distributed in interdendritic regions and were composed of NbC, Laves,γ′, and δ phases. The homogenization process suggested that the interdendritic detrimental precipitated Laves phase can be eliminated or redissolved after homogenization at 1150°C for 20 h, suggesting it was the most suitable homogenization treatment. Thermal compression test results showed that the GH4169D alloys after homogenization treatment had no cracks and dynamic recrystallization occurred, with recrystallization volume fraction increasing with temperature, indicating a good working plasticity at temperatures from 1050 to 1200°C.

关键词： GH4169D superalloy as-cast microstructure segregation homogenization thermal 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：