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THE GENERALIZED EISENSTEIN CRITERION

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Chinese Science Bulletin 1989年第17期34卷 1413-1416页

作者：郑秋成 Department of Mathematics Sichuan University Chengdu

The Eisenstein Criterion is a sharp tool, i.e. a sufficient condition to judge a polynomial irreducible by using the coefficients of the polynomial. In particular, it plays an important role in studying totally ramified extensions of local fields. In this report, we shall generalize the Eisenstein Criterion for totally ramified extensions of local fields, and then we can get some results about extensions of local fields, that is to say, the conditions of tamely ramified extensions are cyclic or metacyclic.

关键词： Eisenstein Criterion local field metacyclic extension

Level 2 Automatic Control System of LF

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Journal of Iron and Steel Research International 2011年第S2期18卷 172-175页

作者： LIU Dan-mei, qiu cheng-guo, LIAO Hui ( Beijing Shougang Automation Information Technology Company, Beijing 100041, China ) Beijing Shougang Automat Informat Technol Co Beijing 100041 Peoples R China

Research on level 2 control system of 100 tons LF furnace was carried out. According to the principle of energy conservation and principle of mass conservation, the LF temperature prediction model and the composition prediction model were established. At the same time, the set value calculated by heating model and addition model could be sent to PLC. The results show that the technical indexes of LF furnace level 2 control system reach the demand and the system realizes automatic control.

关键词： ladle furnace mathematical model level 2 control system

Ghost spintronic THz-emitter-array microscope

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Light(Science & Applications) 2020年第1期9卷 1057-1065页

作者： Si-Chao Chen Zheng Feng Jiang Li Wei Tan Liang-Hui Du Jianwang Cai Yuncan Ma Kang He Haifeng Ding Zhao-Hui Zhai Ze-Ren Li cheng-Wei qiu Xi-cheng Zhang Li-Guo Zhu Institute of Fluid Physics China Academy of Engineering PhysicsMianyang 621900 SichuanChina Department of Optics and Optical Engineering University of Science and Technology of ChinaHefei 230026 AnhuiChina Microsystem&Terahertz Research Center China Academy of Engineering PhysicsChengdu 610200 SichuanChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences100190 BeijingChina National Laboratory of Solid-State Microstructures and Department of Physics Nanjing UniversityNanjing 210093 JiangsuChina Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore The Institute of Optics University of RochesterRochesterNY 14627USA

Terahertz(THz)waves show great potential in nondestructive testing,biodetection and cancer *** recent progress in THz wave near-field probes/apertures enabling raster scanning of an object’s surface,an efficient,nonscanning,noninvasive,deep subdiffraction imaging technique remains ***,we demonstrate THz near-field microscopy using a reconfigurable spintronic THz emitter array(STEA)based on the computational ghost imaging *** illuminating an object with the reconfigurable STEA followed by computing the correlation,we can reconstruct an image of the object with deep subdiffraction *** applying an external magnetic field,inline polarization rotation of the THz wave is realized,making the fused image contrast ***-of-flight(TOF)measurements of coherent THz pulses further enable objects at different distances or depths to be *** demonstrated ghost spintronic THz-emitter-array microscope(GHOSTEAM)is a radically novel imaging tool for THz near-field imaging,opening paradigm-shifting opportunities for nonintrusive label-free bioimaging in a broadband frequency range from 0.1 to 30 THz(namely,3.3-1000 cm^(−1)).

关键词： ghost Ghost GHOST

Relationship between survivin expression and recurrence,and prognosis in hepatocellular carcinoma

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World Journal of Gastroenterology 2007年第46期13卷 6264-6268页

作者： Chao-Ping Ye cheng-Zhi qiu Zhong-Xin Huang Qi-Chen Su Wei Zhuang Rui-Lan Wu Xin-Feng Li Department of Hepatobiliary Surgery Second Affiliated Hospitalof Fujian Medical University Quanzhou 362000 Fujian ProvinceChina Departmentof Pathology Second Affiliated Hospital of Fujian MedicalUniversity Quanzhou 362000 Fujian Province China

AIM： To study the expression of the inhibitor of apoptosis protein survivin in hepatocellular carcinoma （HCC）, and its correlation with clinicopathological factors, cell proliferation, recurrence and prognosis after hepatectomy. METHODS： Immunohistochemical staining of survivin and Ki-67 was performed by the standard streptavidin- peroxidase technique on paraffin sections of 55 cases of HCC. RESULTS： The positive rate of survivin in HCC was 52.7% （29/55）. Significant correlation was found between survivin expression with portal vein thrombi and intrahepatic matastasistic nodes （P 〈 0.05）. The recurrent rate in survivin-positive HCC was significantly higher than that in survivin-negative HCC after hepatectomy, the 1- and 3-year survival rate in patients with survivin-positive tumors was significantly lower than that in patients with survivin-negative tumors （58.62 and 10.34% vs 76.92 and 30.77%, P 〈 0.05, log-rank test）. The proliferation index （Ki-67） in survivin-positive HCC （33.83% ± 18.90%） was significantly higher than that in survivin-negative HCC （19.60% ± 19.35%）（P 〈 0.05）. CONCLUSION： Survivin may play an important role in progression of HCC by promoting cell proliferation, and may be positively correlated with high risk of disease recurrence and poor prognosis in HCC. Its expression may serve as a prognostic factor for patients with HCC after hepatectomy.

关键词： Hepatocelluar carcinoma Survivin Proliferation index Prognosis Immunohistochemistry

基于粉末本构模型和多体力学仿真的模架集成式粉末成形设备的设计

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机械工程学报 2013年第20期49卷 176-183页

作者：邱诚夏伟华南理工大学机械与汽车工程学院广州510640

研制出一种新型的低成本、小体积、高精度的专用模架集成式粉末成形设备。以***与***软件相结合提出基于数值模拟的1 MN压机设计方法,即根据粉末压制试验构建末材料流动应力本构模型;通过该模型在***软件数值计算出所设计压机压制过程... 详细信息

研制出一种新型的低成本、小体积、高精度的专用模架集成式粉末成形设备。以***与***软件相结合提出基于数值模拟的1 MN压机设计方法,即根据粉末压制试验构建末材料流动应力本构模型;通过该模型在***软件数值计算出所设计压机压制过程的模冲载荷;在分析模架集成式粉末成形设备各个模板在压制工过程运动特点的基础上,建立多体运动学数学方程;将所得模冲载荷作为边界条件加载到对模架集成式粉末成形设备在压制过程的模拟仿真;并在***软件中分析各个模板在压制过程中力学状态,从中分析该设备在实际工况下的可靠性。研制出电液比例阀和光栅尺相结合的控制系统,实现对缸同时驱动,解决不同模板之间的动作协调的问题,所研制试验样机实现零件轴向压制精度为±0.02 mm。实际压制过程所得各模冲载荷与模拟结果相一致,从而验证粉末成形设备设计所采用的本构模型是准确的,基于数值模拟进行粉末成形设备设计的方法的正确性。

关键词：粉末压制模架集成成形设备本构模型数值模拟

Prognostic Value of Model for End-Stage Liver Disease Incorporating with Serum Sodium Score for Development of Acute Kidney Injury after Liver Transplantation

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Chinese Medical Journal 2018年第11期131卷 1314-1320页

作者： Yuan cheng Guo-Qing Wei qiu-cheng Cai Yi Jiang Ai-Ping Wu Department of Hepatobiliary Surgery Fuzhou General Hospital Fuzhou Fujian 350025 China Department of Comparative Medicine Fuzhou General Hospital Fuzhou Fujian 350025 China

Background： Contribution of model for end-stage liver disease incorporating with serum sodium （MELD-Na） score in predicting acute kidney injury （AKI） after orthotopic liver transplantation （OLT） is yet to be identified. This study assessed the prognostic value ot MELD-Na score for the development of AKl following OLT. Methods： Preoperative and surgery-related variables of 321 adult end-stage liver disease patients who underwent OLT in Fuzhou General Hospital were collected. PostoperativeAKI was defined and staged in accordance with the clinical practice guidelines developed by Kidney Disease： Improving Global Outcomes. Univariate and multivariate analysis was performed to determine the risk factors fnr AKI following OLT. The discriminating power of MELD/MELD-Na score on AKI outcome was evaluated by receiver operating characteristic （ROC） curve. Spearman＇s correlation analysis was used for identifying the correlated relationship between MELD/MELD-Na score and the severity levels of AKI. Results： The prevalence of AKI following OLT was in 206 out of 321 patients （64.2%）. Three risk lhctors for AKI post-OLT were presented, preoperative calculated MELD score （odds ratio [OR] = 1.048, P = 0.021）, intraoperative volume of red cell suspension transfusion （OR = 1.001, P 0.002）, and preoperative liver cirrhosis （OR = 2.015, P = 0.012）. Two areas under ROC curve （AUCs） of MELD/MELD-Na score predicting AKI were 0.688 and 0.672, respectively; the difference between two AUCs was not significant （Z= 1.952, P = 0.051）. The Spearman＇s correlation coefficients between MELD/MELD-Na score and the severity levels of AKI were 0.406 and 0.385 （P 0.001, 0.001）, respectively. Conclusions： We demonstrated that preoperative MELD score, intraoperative volume of red cell suspension transfusion and preoperative liver cirrhosis were risk factors for AKI following OLT. Furthermore, we preliminarily validated that MELD score seemed to have a stronger power discriminating AKI post-OLT than that of

关键词： Acute Kidney Injury Liver Transplantation Model for End-Stage Liver Disease Score

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基于水文气象因子的农田生态系统碳通量预测

湖北农业科学 2024年第8期63卷 267-280页

作者：吴成秋曹召丹赵小二吴宏宇邓科江苏省水文水资源勘测局徐州分局江苏徐州221000 曲阜师范大学地理科学系山东日照276800 浙江大学建筑工程学院杭州310058 青岛理工大学环境与市政工程学院山东青岛266033

以黄河流域下游禹城农田生态系统为研究对象,采用中国通量观测研究网络(ChinaFLUX)禹城站通量塔观测的碳水通量和水文气象数据,基于特征重要性方法确定影响农田生态系统CO_(2)交换量的主控环境因子。基于所有环境因子和主控环境因子分... 详细信息

以黄河流域下游禹城农田生态系统为研究对象,采用中国通量观测研究网络(ChinaFLUX)禹城站通量塔观测的碳水通量和水文气象数据,基于特征重要性方法确定影响农田生态系统CO_(2)交换量的主控环境因子。基于所有环境因子和主控环境因子分别构建碳通量预测的机器学习模型,采用均方误差(MSE)、平均绝对误差(MAE)和决定系数(R~2)评估测试集的模型预测性能。结果表明,影响禹城农田生态系统碳通量的主控环境因子为净辐射、土壤温度、饱和水汽压亏缺、土壤含水量。与单一模型相比,集成模型具有更好的预测性能。单一模型中,MLPRegressor模型预测性能较好,R~2为0.830,MSE为3.113,MAE为1.283。集成模型中,XGBRegressor模型预测性能较好,R~2为0.845,MSE为2.838,MAE为1.149。采用主控环境因子与采用全部环境因子构建的机器学习模型具有相似预测性能。

关键词：农田生态系统碳通量预测水文气象因子机器学习模型

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Superoscillation:from physics to optical applications

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Light(Science & Applications) 2019年第1期8卷 688-710页

作者： Gang Chen Zhong-Quan Wen cheng-Wei qiu College of Optoelectronic Engineering Chongqing University174 Shazheng StreetChongqing 400044China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore

The resolution of conventional optical elements and systems has long been perceived to satisfy the classic Rayleigh *** efforts have been made to develop different types of superresolution techniques to achieve optical resolution down to several nanometres,such as by using evanescent waves,fluorescence labelling,and *** imaging techniques,which are noncontact,far field and label free,are highly desirable but challenging to *** concept of superoscillation offers an alternative route to optical superresolution and enables the engineering of focal spots and point-spread functions of arbitrarily small size without theoretical *** paper reviews recent developments in optical superoscillation technologies,design approaches,methods of characterizing superoscillatory optical fields,and applications in noncontact,far-field and label-free superresolution *** work may promote the wider adoption and application of optical superresolution across different wave types and application domains.

关键词： optical oscillation resolution

Portal vein arterialization technique for liver transplantation patients

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World Journal of Gastroenterology 2014年第34期20卷 12359-12362页

作者： Kun Zhang Yi Jiang Li-Zhi Lv qiu-cheng Cai Fang Yang Huan-Zhang Hu Xiao-Jin Zhang Department of Hepatobiliary Surgery Fu Zhou General HospitalNan Jing Military Command

Liver transplantations were performed on two patients with hepatic failure caused by liver *** obsolete thrombi and portal venous sclerosis were observed in the major portal veins of both *** arteria colica media of one recipient and the portal vein of the donor were anastomosed *** hepatic artery of the first donor was anastomosed end-to end with the gastroduodenal artery of the first recipient;meanwhile,the portal vein of the second donor was simultaneously anastomosed end-to-end with the common hepatic artery of the second *** blood flow of the portal vein,the perfusion of the donor liver and liver function were satisfactory after *** vein arterialization might be an effective treatment for patients whose portal vein reconstruction was difficult.

关键词： Portal vein arterialization Liver transplantation Portal vein Postoperative complication Donor