检索结果-南通市图书馆

Laser-induced breakdown spectroscopy in Asia

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2016年第6期11卷 231-255页

作者： Zhen-ZhenWang Yoshihiro Deguchi Zhen-Zhen Zhang Zhe Wang Xiao-yan Zeng jun-jie yan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Graduate School of Advanced Technology and Science Tokushima University Tokushima 770-8501 Japan State Key Lab of Power Systems Department of Thermal Engineering Tsinghua-BP Clean Energy Center Tsinghua University Beijing 100084 China Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology Wuhan ~3007~ China

Laser-induced breakdown spectroscopy (LIBS) is an analytical detection technique based on atomic emission spectroscopy to measure the elemental composition. LIBS has been extensively studied and developed due to the non-contact, fast response, high sensitivity, real-time and multi-elemental detection features. The development and applications of LIBS technique in Asia are summarized and discussed in this review paper. The researchers in Asia work on different aspects of the LIBS study in fundamentals, data processing and modeling, applications and instrumentations. According to the current research status, the challenges, opportunities and further development of LIBS technique in Asia are also evaluated to promote LIBS research and its applications.

关键词： laser-induced breakdown spectroscopy (LIBS) quantitative analysis signal enhancement applications challenges

Establishment of Beauveria bassiana as a fungal endophyte in potato plants and its virulence against potato tuber moth, Phthorimaea operculella (Lepidoptera: Gelechiidae)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2023年第1期30卷 197-207页

作者： Meng-Di Zhang Sheng-Yong Wu jun-jie yan Stuart Reitz Yu-Lin Gao State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBejingChina Department of Crop and Soil Sciences Malheur Experiment StationOregon State UniversityOntarioORUSA National Center of Excellence for Tuber and Root Crop Research Chinese Academy of Agricultural SciencesBeijingChina

The potato tuber moth,Phthorimaea operculella,is the most damaging potato pest in the world and is difficult to control as the larvae are internal feeders in the foliage and *** fungi that colonize plants as endophytes have lethal and sublethal pathological effects on insect *** show that Beauveria bassiana colonizes the aerial parts of potato plants endophytically after inoculation through soil *** *** persisted in potato foliage for more than 50 days *** indicated that foliage of ***-inoculated potato plants were pathogenic against larvae of P *** experiments indicated that *** negatively affected the growth,development,and reproduction of P *** experiments showed that the weight of *** pupae reared on *** potato plants(4.25 mg)was significantly less than that of those reared on uninoculated control plants(8.89mg).Compared with newly eclosed larvaefed on control plants,those fed on ***-inoculated plants had significantly lower survivorship,with only 17.8%developing to the adult *** of P operculella females reared on *** endophytically colonized plants was significantly lower(35 eggs/female)than of those reared on uninoculated plants(115 eggs/female).This study demonstrates that endophytic *** can be a potential biological control agent for the control and management of P *** pupal weights of P operculella reared on potato plants inoculated with the *** strain GZGY-1-3 and on untreated control plants,pupae from the control plants were significantly heavier than those from treated plants.

关键词： Beauveria bassiana biological control colonization Phthorimaea operculella

A Gaussian process regression accelerated multiscale model for conduction-radiation heat transfer in periodic composite materials with temperature-dependent thermal properties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Aerodynamics 2022年第1期4卷 642-661页

作者： Zi-Xiang Tong Ming-Jia Li Zhaolin Gu jun-jie yan Wen-Quan Tao School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an710049ShaanxiChina Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049ShaanxiChina School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an710049ShaanxiChina

Prediction of the coupled conduction-radiation heat transfer in composite materials with periodic structure is important in high-temperature applications of the materials. The temperature dependence of thermal properties complicates the problem. In this work, a multiscale model is proposed for the conduction-radiation heat transfer in periodic composite materials with temperature-dependent thermal properties. Homogenization analysis of the coupled conduction and radiative transfer equations is conducted, in which the temperature dependence of thermal properties is considered. Both the macroscopic homogenized equations and the local unit cell problems are derived. It is proved that the macroscopic average temperature can be used in the unit cell problems for the first-order corrections of the temperature and radiative intensity, and the calculations of effective thermal properties. The temperature dependence of thermal properties only influences the higher-order corrections. A multiscale numerical method is proposed based on the analysis. The Gaussian process (GP) regression is coupled into the multiscale algorithm to build a correlation between thermal properties and temperature for the macroscale iterations and prevent the repetitive solving of unit cell problems. The GP model is updated by additional solutions of unit cell problems during the iteration according to a variance threshold. Numerical simulations of conduction-radiation heat transfer in composite with isotropic and anisotropic periodic structures are used to validate the proposed multiscale model. It is found that the accuracy and efficiency of the multiscale method can be guaranteed by using a proper variance threshold for the GP model. The multiscale model can provide both the average temperature and radiative intensity fields and their detailed fluctuations due to the local structures.

关键词： Multiscale model Heat Conduction Radiative transfer equation Temperature-dependent Gaussian process regression Machine learning

In vivo SPECT imaging of an 131I-labeled PM 2.5 mimic substitute

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2020年第11期31卷 60-67页

作者： Dong-Hui Pan jie Sheng Xin-Yu Wang Qian-Huan Huang jun-jie yan Li-Zhen Wang Run-Ling yang Dong-Jian Shi Yu-Ping Xu Ming-Qing Chen Key Laboratory of Synthetic and Biological Colloids School of Chemical and Material EngineeringMinistry of EducationJiangnan UniversityWuxi 214122China Key Laboratory of Nuclear Medicine Jiangsu Key Laboratory of Molecular Nuclear MedicineMinistry of HealthJiangsu Institute of Nuclear MedicineWuxi 214063China

The health effects of ambient PM 2.5 and its potential mechanisms have generated considerable *** vitro cell studies and ex vivo animal experiments may not accurately determine the characteristics of PM 2.5 *** better understand their detailed mechanisms,we performed an in vivo study using single photon emission tomography(SPECT)*** mimic the PM 2.5 particles,SiO2 nanoparticles modified by ethylene carbonate or polyvinyl pyrrolidone were labeled with *** administration via inhalation,in vivo SPECT imaging of the radiolabeled particles in sprague dawley rats was *** was found that radioactivity accumulated in the lungs and trachea 6 and 24 h after *** addition,significant radioactivity was observed in the abdomen,including the liver and *** results were also confirmed by ex vivo *** study revealed that in vivo SPECT imaging could be an effective method for investigating the properties of PM 2.5 particles.

关键词： PM 2.5 mimic substitute EC/SiO2 nanoparticles SPECT images 131I labeling

超临界压力下竖直圆管内正癸烷对流换热不稳定性实验

在线全文

学校读者我要写书评

暂无评论

推进技术 2017年第2期38卷 450-456页

作者：严俊杰赵然闫帅祝银海姜培学热科学与动力工程教育部重点实验室清华大学热能工程系北京100084

以超临界压力正癸烷为工质,在内径2mm的竖直圆管内进行了不同工况条件下的流动与换热不稳定性实验研究。实验发现两种原理的不稳定性现象。转捩型是由于流动状态由层流向湍流转变引起,多为随机的小幅震荡,约在Re=5000左右出现;物性型由... 详细信息

以超临界压力正癸烷为工质,在内径2mm的竖直圆管内进行了不同工况条件下的流动与换热不稳定性实验研究。实验发现两种原理的不稳定性现象。转捩型是由于流动状态由层流向湍流转变引起,多为随机的小幅震荡,约在Re=5000左右出现;物性型由准临界温度附近剧烈变化物性所致,具有较大振幅和固定周期,约8~15s。增强系统稳定性的方法主要包括提高进口流体温度、升高压力或者采用向下流动方式。实验还发现在振荡区间内存在稳定区间现象。

关键词：超临界压力流体碳氢燃料对流换热不稳定性超燃冲压发动机

Prognostic model for esophagogastric variceal rebleeding after endoscopic treatment in liver cirrhosis: A Chinese multicenter study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第2期31卷 85-101页

作者： jun-Yi Zhan jie Chen Jin-Zhong Yu Fei-Peng Xu Fei-Fei Xing De-Xin Wang Ming-yan yang Feng Xing Jian Wang Yong-Ping Mu Cell Biology Laboratory Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China Institute of Liver Diseases Shanghai Academy of Chinese MedicineShanghai 201203China Clinical Key Laboratory of Traditional Chinese Medicine of Shanghai Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China Key Laboratory of Liver and Kidney Disease of the Ministry of Education Shanghai University of Traditional Chinese MedicineShanghai 201203China Department of Gastroenterology and Hepatology Zhongshan Hospital Affiliated to Fudan UniversityShanghai 200032China Shanghai Institute of Liver Disease Fudan UniversityShanghai 200032China Evidence-Based Medicine Center Fudan UniversityShanghai 200032China Department of Gastrointestinal Endoscopy Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China Department of Hepatology Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China

BACKGROUND Rebleeding after recovery from esophagogastric variceal bleeding(EGVB)is a severe complication that is associated with high rates of both incidence and *** its clinical importance,recognized prognostic models that can effectively predict esophagogastric variceal rebleeding in patients with liver cirrhosis are *** To construct and externally validate a reliable prognostic model for predicting the occurrence of esophagogastric variceal *** This study included 477 EGVB patients across 2 cohorts:The derivation cohort(n=322)and the validation cohort(n=155).The primary outcome was rebleeding events within 1 *** least absolute shrinkage and selection operator was applied for predictor selection,and multivariate Cox regression analysis was used to construct the prognostic *** validation was performed with bootstrap *** assessed the discrimination,calibration and accuracy of the model,and performed patient risk *** Six predictors,including albumin and aspartate aminotransferase concentrations,white blood cell count,and the presence of ascites,portal vein thrombosis,and bleeding signs,were selected for the rebleeding event prediction following endoscopic treatment(REPET)*** predicting rebleeding within 1 year,the REPET model ex-hibited a concordance index of 0.775 and a Brier score of 0.143 in the derivation cohort,alongside 0.862 and 0.127 in the validation ***,the REPET model revealed a significant difference in rebleeding rates(P<0.01)between low-risk patients and intermediate-to high-risk patients in both *** We constructed and validated a new prognostic model for variceal rebleeding with excellent predictive per-formance,which will improve the clinical management of rebleeding in EGVB patients.

关键词： Esophagogastric variceal bleeding Variceal rebleeding Liver cirrhosis Prognostic model Risk stratification Secondary prophylaxis

Pretreatment red blood cell distribution width as a predictive marker for postoperative complications after laparoscopic pancreatoduodenectomy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2025年第1期17卷 143-157页

作者： Xian-Rang Cao Yin-Long Xu Jia-Wei Chai Kai Zheng jun-jie Kong jun Liu Shun-Zhen Zheng Department of Liver Transplantation and Hepatobiliary Surgery Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021Shandong ProvinceChina Department of Breast and Thyroid Surgery Shandong Provincial Maternal and Child Health Care HospitalJinan 250014Shandong ProvinceChina

BACKGROUND Red blood cell distribution width(RDW)is associated with the development and progression of various *** To explore the association between pretreatment RDW and short-term outcomes after laparoscopic pancreatoduodenectomy(LPD).METHODS A total of 804 consecutive patients who underwent LPD at our hospital between March 2017 and November 2021 were retrospectively *** between pretreatment RDW and clinicopathological characteristics and short-term outcomes were *** Patients with higher pretreatment RDW were older,had higher Eastern Cooperative Oncology Group scores and were associated with poorer short-term outcomes than those with normal *** pretreatment RDW was an independent risk factor for postoperative complications(POCs)(hazard ratio=2.973,95%confidence interval:2.032-4.350,P<0.001)and severe POCs of grade IIIa or higher(hazard ratio=3.138,95%confidence interval:2.042-4.824,P<0.001)based on the Clavien-Dino classification *** analysis showed that high pretreatment RDW was an independent risk factor for Clavien-Dino classi-fication grade IIIb or higher POCs,a comprehensive complication index score≥26.2,severe postoperative pancreatic fistula,severe bile leakage and severe *** pretreatment RDW was positively associated with the neutrophil-to-lymphocyte ratio and platelet-to-lymphocyte ratio and was negatively associated with albumin and the prognostic nutritional *** Pretreatment RDW was a special parameter for patients who underwent *** was associated with malnutrition,severe inflammatory status and poorer short-term *** could be a surrogate marker for nutritional and inflammatory status in identifying patients who were at high risk of developing POCs after LPD.

关键词： Biomarker Laparoscopic pancreatoduodenectomy Postoperative complication Red blood cell distribution width Short-term outcomes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

外伤性晶状体脱位继发青光眼的手术治疗

国际眼科杂志 2013年第3期13卷 573-574页

作者：鄢俊杰陈晓丁怡肖艳霞广州军区武汉总医院眼科中国人民解放军眼科中心中国湖北省武汉市430070

目的:探讨外伤性晶状体脱位继发青光眼的手术方法及临床疗效。方法:晶状体脱位继发青光眼的32例病例中,22例行晶状体玻璃体切除术,7例行晶状体玻璃体切除联合小梁切除术,3例行晶状体玻璃体切除联合青光眼引流阀植入术。随诊1～12mo,观... 详细信息

目的:探讨外伤性晶状体脱位继发青光眼的手术方法及临床疗效。方法:晶状体脱位继发青光眼的32例病例中,22例行晶状体玻璃体切除术,7例行晶状体玻璃体切除联合小梁切除术,3例行晶状体玻璃体切除联合青光眼引流阀植入术。随诊1～12mo,观察眼压、视力及并发症等。结果:患者32例术前平均眼压45.67±14.36mmHg,随访末次眼压16.63±7.94mmHg,其中9～21mmHg者27例,21～24mmHg者4例,>24mmHg者1例。术后矫正视力提高者24例,不变者7例,下降者1例。结论:根据患者具体情况,选择适当的手术方式,是治疗外伤性晶状体脱位继发青光眼安全、有效的措施。

关键词：晶状体脱位青光眼玻璃体切除术联合手术

在线全文

学校读者我要写书评

暂无评论

基于QFT的高超声速飞行器鲁棒控制器设计

系统仿真学报 2010年第3期22卷 695-698,703页

作者：鹿存侃马骏闫杰西北工业大学航天学院西安710072

针对高超声速飞行器调姿段姿态控制问题,将超燃冲压发动机不同工作状态对高超声速飞行器模型参数的影响看作是不确定对象鲁棒性问题的扩展,应用QFT设计了鲁棒控制器。通过将飞控系统的时域指标转化为频域指标,生成Nichols图上的复合频... 详细信息

针对高超声速飞行器调姿段姿态控制问题,将超燃冲压发动机不同工作状态对高超声速飞行器模型参数的影响看作是不确定对象鲁棒性问题的扩展,应用QFT设计了鲁棒控制器。通过将飞控系统的时域指标转化为频域指标,生成Nichols图上的复合频域边界,利用回路整形设计控制器和前置滤波器,使得闭环系统频率响应满足所有性能指标要求。仿真结果表明,所设计控制器能够满足高超声速飞行器调姿段控制需求,有效抑制输出端干扰,并且当模型参数具有较大范围的不确定性时,具有良好鲁棒性能,有较好的工程应用价值。

关键词：高超声速飞行器鲁棒控制定量反馈理论回路整形