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On Browkin's conjecture about the elements of order five in K2（Q）

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Science china mathematics 2007年第1期 116-120页

作者： ke-jian xu department of mathematics, qingdao university, qingdao 266071, china

Based on the work of Lenstra, a succinct proof of Browkin’s conjecture about the elements of order five in K2(Q) is given.

关键词： K2 group cyclotomic polynomial lattice binary quartic form.

A risk assessment method considering risk attributes and work safety informational needs and its application

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Chinese Journal of Chemical Engineering 2024年第4期68卷 253-262页

作者： Cong Luo Yunsheng Zhao ke xu School of Political Science and Public Administration Shandong UniversityQingdao 266200China Faculty of Engineering China University of GeosciencesWuhan 430074China department of Emergency Management of Hubei Province Wuhan 430064China

The technological revolution has spawned a new generation of industrial systems,but it has also put forward higher requirements for safety management accuracy,timeliness,and *** assessment needs to evolve to address the existing and future challenges by considering the new demands and advancements in safety *** study aims to propose a systematic and comprehensive risk assessment method to meet the needs of process system safety *** methodology first incorporates possibility,severity,and dynamicity(PSD)to structure the“51X”evaluation indicator system,including the inherent,management,and disturbance risk ***,the four-tier(risk point-unit-enterprise-region)risk assessment(RA)mathematical model has been established to consider supervision *** in conclusion,the application of the PSD-RA method in ammonia refrigeration workshop cases and safety risk monitoring systems is presented to illustrate the feasibility and effectiveness of the proposed PSD-RA method in safety *** findings show that the PSD-RA method can be well integrated with the needs of safety work informatization,which is also helpful for implementing the enterprise's safety work responsibility and the government's safety supervision responsibility.

关键词： Risk assessment Safey “51X”evaluation indicator system Four-tier risk assessment model Risk attributes Process system

Suppression of the regrowth interface leakage current in AlGaN/GaN HEMTs by Fe doped GaN substrate

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Science china(Information Sciences) 2024年第6期67卷 461-462页

作者： Xiao WANG Zhi-Yu LIN Yuan-Hang SUN Long YUE Yu-Min ZHANG jian-Feng WANG ke xu School of Nano-Tech and Nano-Bionics University of Science and Technology of China Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences Information Materials Research department Suzhou laboratory Suzhou Nanowin Science and Technology Co. Ltd. jiangsu Institute of Advanced Semiconductors

In the process of homoepitaxy AlGaN/GaN heterojunction by metal-organic chemical vapor deposition (MOCVD) on free-standing substrates,Si impurities from the air and reaction chamber accumulate at the regrowth interfac...

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B-cell-specific signatures reveal novel immunophenotyping and therapeutic targets for hepatocellular carcinoma

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World Journal of Gastroenterology 2024年第34期30卷 3894-3925页

作者： ke-Quan xu Zheng Gong Jia-Ling Yang Chu-Qi Xia jian-Yi Zhao Xi Chen department of Hepatobiliary and Pancreatic Surgery Zhongnan Hospital of Wuhan UniversityWuhan 430071Hubei ProvinceChina department of Pharmacy Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina School of Basic Medical Sciences Nanjing Medical UniversityNanjing 211166Jiangsu ProvinceChina department of Gastrointestinal Surgery The Second Affiliated Hospital of Kunming Medical UniversityKunming 650101Yunnan ProvinceChina department of General Surgery Second People’s Hospital of Jiaozuo CityJiaozuo 454001Henan ProvinceChina

BACKGROUND Immunotherapy presents both promises and challenges in treating hepatocellular carcinoma(HCC)due to its complex immunological *** role of B cells,a key part of the immune system,remains uncertain in *** To identify B-cell-specific signatures and reveal novel immunophenotyping and therapeutic targets for *** Using the Tumor Immune Single-cell Hub 2 database,we identified B-cell-related genes(BRGs)in *** enrichment analysis was performed to explore the possible collaboration between B cells and T cells in *** conducted univariate Cox regression analysis using The Cancer Genome Atlas liver HCC collection dataset to find BRGs linked to HCC ***,least absolute shrinkage and selection operator regression was utilized to develop a prognostic model with 11 *** model was validated using the International Cancer Genome Consortium dataset and *** The risk score derived from the prognostic model emerged as an independent prognostic factor for *** of the immune microenvironment and cell infiltration revealed the immune status of various risk groups,supporting the cooperation of B and T cells in suppressing *** BRGs model identified new molecular subtypes of HCC,each with distinct immune *** sensitivity analysis identified targeted drugs effective for each HCC subtype,enabling precision therapy and guiding clinical *** We clarified the role of B cells in HCC and propose that the BRGs model offers promising targets for personalized immunotherapy.

关键词： B cell Hepatocellular carcinoma Immune microenvironment Immunotherapy Molecular subtype

Facile Surface Engineering of NiCo_(2)O_(4) to Boost Propane Oxidation Activity

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china Petroleum Processing & Petrochemical Technology 2024年第1期26卷 19-26页

作者： Yang Jialei Wang Fengyi Lei Yang Zhang Mingchao Sun Shiqiang xu Wenfan ke Jiaxiang Wu Haojie Li Xingyun Qi jian Institute of Materials for Energy and Environment College of Materials Science and EngineeringQingdao UniversityQingdao 266071China School of Chemistry and Chemical Engineering Hubei Key Laboratory of Coal Conversion and New Carbon MaterialsWuhan University of Science and TechnologyWuhan 430081China department of Burn and Plastic Surgery Qingdao Municipal Hospital Affiliated to Rehabilitation UniversityQingdao 266000China State key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Spinel oxide(NiCo_(2)O_(4))has demonstrated great potential to replace noble metal catalysts for the oxidation reaction of air *** further boost the oxidation ability of such catalysts,in this study,a facile surface-engineering strategy wherein NiCo_(2)O_(4) was treated with different alkali solvents was *** obtained catalyst(NiCo_(2)O_(4)-OH)showed a higher surface alkalinity and more surface defects compared to the pristine spinel oxide,including enhanced structural distortion as well as promoted oxygen *** propane oxidation ability of NiCo_(2)O_(4)-OH was greatly enhanced,with a propane conversion rate that was approximately 6.4 times higher than that of pristine NiCo_(2)O_(4) at a reaction temperature 193℃.This work sets a valuable paradigm for the surface modulation of spinel oxide via alkali treatment to ensure a high-performance oxidation catalyst.

关键词： NiCo_(2)O_(4) surface defects alkali treatment propane oxidation

Laparoscopic enucleation for pancreatic lipomatous hamartoma

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Hepatobiliary & Pancreatic Diseases International 2024年第5期23卷 541-544页

作者： Da-Long Wan Rong-Liang Tong Xin-Yu Tong Chen Hu Qing-Hong ke xu Yang jian Wu department of Hepatobiliary and Pancreatic Surgery the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China department of Pathology the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China

To the Editor : Pancreatic hamartoma is an extremely rare and benign disease and accounts for less than 1% of all pancreatic tumors [1]. Pancreatic lipomatous hamartoma(PLH), a distinct variant of pancreatic hamartoma, is always easily misdiagnosed as other pancreatic tumors with lipomatous components, including pancreatic lipoma, liposarcoma, teratoma and malignant tumors with fatty degeneration. Here, we report a case of laparoscopic enucleation for the pancreatic head lipomatous hamartoma and provide new treatment strategies for surgeons who encounter similar diseases in the future.

关键词： degeneration Laparoscopic diseases

T2-weighted imaging-based radiomic-clinical machine learning model for predicting the differentiation of colorectal adenocarcinoma

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World Journal of Gastrointestinal Oncology 2024年第3期16卷 819-832页

作者： Hui-Da Zheng Qiao-Yi Huang Qi-Ming Huang Xiao-Ting ke Kai Ye Shu Lin jian-Hua xu department of Gastrointestinal Surgery The Second Affiliated Hospital of Fujian Medical UniversityQuanzhou 362000Fujian ProvinceChina department of Gynaecology and Obstetrics The Second Affiliated Hospital of Fujian Medical UniversityQuanzhou 362000Fujian ProvinceChina department of Computed Tomography/Magnetic Resonance Imaging The Second Affiliated Hospital of Fujian Medical UniversityQuanzhou 362000Fujian ProvinceChina Centre of Neurological and Metabolic Research The Second Affiliated Hospital of Fujian Medical UniversityQuanzhou 362000Fujian ProvinceChina Group of Neuroendocrinology Garvan Institute of Medical ResearchSydneyNSW 2010Australia

BACKGROUND The study on predicting the differentiation grade of colorectal cancer(CRC)based on magnetic resonance imaging(MRI)has not been reported *** a non-invasive model to predict the differentiation grade of CRC is of great *** To develop and validate machine learning-based models for predicting the differ-entiation grade of CRC based on T2-weighted images(T2WI).METHODS We retrospectively collected the preoperative imaging and clinical data of 315 patients with CRC who underwent surgery from March 2018 to July *** were randomly assigned to a training cohort(n=220)or a validation cohort(n=95)at a 7:3 *** were delineated layer by layer on high-resolution *** absolute shrinkage and selection operator regression was applied to screen for radiomic *** and clinical models were constructed using the multilayer perceptron(MLP)*** radiomic features and clinically relevant variables(selected based on a significance level of P<0.05 in the training set)were used to construct radiomics-clinical *** performance of the three models(clinical,radiomic,and radiomic-clinical model)were evaluated using the area under the curve(AUC),calibration curve and decision curve analysis(DCA).RESULTS After feature selection,eight radiomic features were retained from the initial 1781 features to construct the radiomic *** different classifiers,including logistic regression,support vector machine,k-nearest neighbours,random forest,extreme trees,extreme gradient boosting,light gradient boosting machine,and MLP,were used to construct the model,with MLP demonstrating the best diagnostic *** AUC of the radiomic-clinical model was 0.862(95%CI:0.796-0.927)in the training cohort and 0.761(95%CI:0.635-0.887)in the validation *** AUC for the radiomic model was 0.796(95%CI:0.723-0.869)in the training cohort and 0.735(95%CI:0.604-0.866)in the validation *** clinical model achieved an AUC of 0.7

关键词： Radiomics Colorectal cancer Differentiation grade Machine learning T2-weighted imaging

Clinical analysis of secondary penile cancer:a case series at a tertiary referral center in china

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Asian Journal of Andrology 2024年第2期26卷 225-226页

作者： Xiao-Yu Li Chun-Ru xu Xing Ji Zhen-Peng Zhu Zhen-ke Guo Tian-Yu Cai jian Lin department of Urology Peking University First HospitalBeijing 100034China Institute of Urology Peking UniversityBeijing 100034China National Urological Cancer Center Beijing 100034China Beijing key Laboratory of Urogenital Diseases(Male)Molecular Diagnosis and Treatment Center Beijing 100034China

Dear Editor,Secondary penile cancer is an extremely rare condition that refers to the metastasis of other malignancies to the *** are limited reports on secondary penile cancer in Asian populations,and perceptions about this disease are extremely *** reviewed and analyzed the data of patients diagnosed with secondary penile cancer based on the pathological findings at Peking university First Hospital in Beijing,china,aiming to expand the clinical reference for this rare disease.

关键词： cancer rare finding

Hydrogen production from hydrolysis of NaBH_(4) solution over Co-Fe-B@g-C_(3)N_(4)/NF thin film catalyst

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Rare Metals 2024年第6期43卷 2648-2659页

作者： Yan Wang Jia-Xin Ma jian Ren Di Zhang Feng-Yan xu ke Zhang Zhong-Qiu Cao Qiu-Ju Sun Guo-De Li Shi-Wei Wu Hong-Hui Chen College of Chemistry and Chemical Engineering Shenyang Normal UniversityShenyang 110034China Experimental Center Shenyang Normal UniversityShenyang 110034China Hunan Shande Energy Storage New Materials Research Institute Limited Company Changde 415000China

In this study,the double loaded Co-Fe-B@g-C_(3)N_(4)/NF(NF:Ni foam)thin film catalysts were prepared for the first time via chemical deposition method at room *** optimizing the reducing agent concentration to 0.9 mol·L^(-1),the as-obtained Co-Fe-B@g-C_(3)N_(4)/NF exhibited the twisted ribbon structure with more distinct three-dimensional hierarchy and the smaller particle size,showing the good catalytic property for the hydrolysis of NaBH_(4)*** H_(2)generation rate of Co-Fe-B@g-C_(3)N_(4)/NF and binary Co-B@g-C_(3)N_(4)/NF under visible light irradiation surpassed the value under natural *** apparent activation energy of Co-Fe-B@g-C_(3)N_(4)/NF(45.0 kJ·mol^(-1))under visible light irradiation was obviously reduced when compared with the natural condition(48.4 kJ·mol^(-1))and binary Co-B@g-C_(3)N_(4)/NF(60.6 kJ·mol^(-1))under visible light ***,the catalytic performance of the optimized Co-Fe-B@g-C_(3)N_(4)/NF thin film catalyst was superior to most of the reported non-noble metal and even noble metal ***,it illustrated that the catalytic H_(2)production performance of Co-Fe-B@g-C_(3)N_(4)/NF thin film was distinctly improved after the introduction of light and multicomponent recombination.

关键词： Sodium borohydride Co-Fe-B@g-C_(3)N_(4)/NF catalyst Chemical deposition Hydrogen production