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Development and application of a throughflow method for high-loaded axial flow compressors

Science China(Technological Sciences) 2016年第1期59卷 93-108页

作者： LI Bo GU Chun Wei LI xiao Tang LIU Tai Qiu xiao yao bing Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal EngineeringTsinghua UniversityBeijing 100084China Shenyang Engine Design and Research Institute Shenyang 110015China Collaborative Innovation Center of Advanced Aero-Engine Beijing 100191China

In this paper, a novel engineering platform for throughflow analysis based on streamline curvature approach is developed for the research of a 5-stage compressor. The method includes several types of improved loss and deviation angle models, which are combined with the authors' adjustments for the purpose of reflecting the influences of three-dimensional internal flow in high-loaded multistage compressors with higher accuracy. In order to validate the reliability and robustness of the method, a series of test cases, including a subsonic compressor P&W 3S1, a transonic rotor NASA Rotor 1B and especially an advanced high pressure core compressor GE E^3 HPC, are conducted. Then the computation procedure is applied to the research of a 5-stage compressor which is designed for developing an industrial gas turbine. The overall performance and aerodynamic configuration predicted by the procedure, both at design- and part-speed conditions, are analyzed and compared with experimental results, which show a good agreement. Further discussion regarding the universality of the method compared with CFD is made afterwards. The throughflow method is verified as a reliable and convenient tool for aerodynamic design and performance prediction of modern high-loaded compressors. This method is also qualified for use in the further optimization of the 5-stage compressor.

关键词： throughflow method multi-stage compressor high-loaded loss and deviation angle models streamline curvature aerodynamic design performance prediction

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Nomogram established using risk factors of early gastric cancer for predicting the lymph node metastasis

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World Journal of Gastrointestinal Oncology 2023年第4期15卷 665-676页

作者： xiao-Cong Jiang xiao-bing yao Heng-Bo Xia Ye-Zhou Su Pan-Quan Luo Jian-Ran Sun En-Dong Song Zhi-Jian Wei A-Man Xu Li-Xiang Zhang Yu-Hong Lan Department of Radiotherapy Oncology Huizhou Municipal Central HospitalHuizhou 516001Guangdong ProvinceChina Emergency Surgery Shanghai Seventh People’s HospitalShanghai 200137China Department of General Surgery First Affiliated Hospital of Anhui Medical UniversityHefei 230031Anhui ProvinceChina Department of Obstetrics and Gynecology First Affiliated Hospital of Anhui Medical UniversityHefei 230031Anhui ProvinceChina Department of Endocrinology The First Affiliated Hospital of USTCDivision of Life Science and MedicineHefei 230031Anhui ProvinceChina Department of Gastroenterology First Affiliated Hospital of Anhui Medical UniversityHefei 230031Anhui ProvinceChina

BACKGROUND For the prognosis of patients with early gastric cancer(EGC),lymph node metastasis(LNM)plays a crucial role.A thorough and precise evaluation of the patient for LNM is now *** To determine the factors influencing LNM and to construct a prediction model of LNM for EGC *** Clinical information and pathology data of 2217 EGC patients downloaded from the Surveillance,Epidemiology,and End Results database were collected and *** on a 7:3 ratio,1550 people were categorized into training sets and 667 people were assigned to testing sets,*** on the factors influencing LNM determined by the training sets,the nomogram was drawn and *** Based on multivariate analysis,age at diagnosis,histology type,grade,T-stage,and size were risk factors of LNM for ***,nomogram was drawn to predict the risk of LNM for EGC *** the categorical variables,the effect of grade(well,moderate,and poor)was the most significant prognosis *** training sets and testing sets,respectively,area under the receiver-operating characteristic curve of nomograms were 0.751[95%confidence interval(CI):0.721-0.782]and 0.786(95%CI:0.742-0.830).In addition,the calibration curves showed that the prediction model of LNM had good *** Age at diagnosis,histology type,grade,T-stage,and tumor size were independent variables for LNM in *** on the above risk factors,prediction model may offer some guiding implications for the choice of subsequent therapeutic approaches for EGC.

关键词： SEER Early gastric cancer Lymph node metastasis Risk factors Nomogram

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Progress in the treatment of advanced hepatocellular carcinoma with immune combination therapy

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World Journal of Gastrointestinal Oncology 2024年第2期16卷 273-286页

作者： Di Pan Hao-Nan Liu Peng-Fei Qu xiao Ma Lu-yao Ma xiao-xiao Chen Yu-Qin Wang xiao-bing Qin Zheng-Xiang Han Department of Oncology The Affiliated Hospital of Xuzhou Medical UniversityXuzhou 221000Jiangsu ProvinceChina Department of Gastroenterology The Second Affiliated Hospital of Xuzhou Medical UniversityXuzhou 221000Jiangsu ProvinceChina Department of General Surgery The Affiliated Hospital of Xuzhou Medical UniversityXuzhou 221000Jiangsu ProvinceChina

Advanced hepatocellular carcinoma(HCC)is a severe malignancy that poses a serious threat to human *** to challenges in early diagnosis,most patients lose the opportunity for radical treatment when ***,recent advancements in cancer immunotherapy provide new directions for the treatment of *** instance,monoclonal antibodies against immune check-point inhibitors(ICIs)such as programmed cell death protein 1/death ligand-1 inhibitors and cytotoxic t-lymphocyte associated antigen-4 significantly improved the prognosis of patients with ***,tumor cells can evade the immune system through various *** the rapid development of genetic engineering and molecular biology,various new immunotherapies have been used to treat HCC,including ICIs,chimeric antigen receptor T cells,engineered cytokines,and certain cancer *** review summarizes the current status,research progress,and future directions of different immunotherapy strategies in the treatment of HCC.

关键词： Hepatocellular carcinoma Immunotherapies Immune checkpoint inhibitor Clinical efficacy Adverse reactions

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Impact of baseline hepatitis B virus viral load on the long-term prognosis of advanced hepatocellular carcinoma treated with immunotherapy

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World Journal of Gastrointestinal Oncology 2024年第6期16卷 2504-2519页

作者： Di Pan Hao-Nan Liu Zhi-Yuan yao xiao-xiao Chen Yu-Qi Li Jing-Jing Zhu Zheng-Xiang Han xiao-bing Qin Department of Oncology The Affiliated Hospital of Xuzhou Medical UniversityXuzhou 221000Jiangsu ProvinceChina

BACKGROUND Although the combination of lenvatinib and PD-1 inhibitors has become the standard regimen for the treatment of advanced hepatocellular carcinoma(HCC),real data on the impact of baseline hepatitis B virus(HBV)-DNA levels on the clinical efficacy of this regimen is still *** To evaluate the effectiveness of camrelizumab combined with lenvatinib in patients with HCC at varying levels of *** One hundred and twenty patients with HCC who received camrelizumab and lenvatinib treatment were categorized into two cohorts:HBV-DNA≤2000(n=66)and HBV-DNA>2000(n=54).The main outcomes measured were overall survival(OS)and progression-free survival(PFS),while additional outcomes included the rate of objective response rate(ORR),disease control rate(DCR),and any negative *** proportional hazards regression analysis revealed independent predictors of OS,leading to the creation of a nomogram incorporating these *** The median PFS was 8.32 months for the HBV-DNA≤2000 group,which was similar to the 7.80 months observed for the HBV DNA>2000 group(P=0.88).Likewise,there was no notable variation in the median OS between the two groups,with durations of 13.30 and 14.20 months respectively(P=0.14).The ORR and DCR were compared between the two groups,showing ORR of 19.70%vs 33.33%(P=0.09)and DCR of 72.73%vs 74.07%(P=0.87).The nomogram emphasized the importance of antiviral treatment as the main predictor of patient results,with portal vein tumor thrombus and Barcelona Clinic Liver Cancer staging following closely *** The clinical outcomes of patients with HBV-associated HCC treated with camrelizumab in combination with lenvatinib are not significantly affected by HBV viral load.

关键词： Hepatitis B virus Hepatocellular carcinoma Camrelizumab Lenvatinib Efficacy

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Infinitely Many Solutions for a Class of Quasi-linear Elliptic Problem

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Acta Mathematicae Applicatae Sinica 2024年第3期40卷 728-743页

作者： xiao-yao JIA Zhen-luo LOU School of Economics and Management Zhongyuan University of TechnologyZhengzhou 450007China Mathematics and Statistics School Henan University of Science and TechnologyLuoyang 471023China

In this paper,we study the following quasi-linear elliptic equation:■where Ω?R^(N) is a bounded domain,λ>0 is a *** function ψ(|t|)t is the subcritical term,and φ(|t|)t is the critical Orlicz-Sobolev growth term with respect to φ.Under appropriate conditions on φ,ψ and φ,we prove the existence of infinitely many weak solutions for quasi-linear elliptic equation,for λ∈(0,λ_(0)),where λ_(0)> 0 is a fixed constant.

关键词： quasi-linear elliptic equations variational methods Orlicz-Sobolev spaces

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Dielectric nanocomposites with superb high-temperature capacitive performance based on high intrinsic dielectric constant polymer

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Nano Research 2024年第9期17卷 8504-8512页

作者： Ding Ai Yuan Chang Haoliang Liu Chenglong Wu yao Zhou Yuting Han Hao Yu bing xiao Yonghong Cheng Guanglei Wu Zirui Jia State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China Institute of Materials for Energy and Environment State Key Laboratory of Bio-Fibers and Eco-TextilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China

Advancements in power electronics necessitate dielectric polymer films capable of operating at high temperatures and possessing high energy *** significant strides have been achieved by integrating inorganic fillers into high-temperature polymer matrices,the inherently low dielectric constants of these matrices have tempered the magnitude of *** this work,we report an innovative nanocomposite based on sulfonylated polyimide(SPI),distinguished by the incorporation of sulfonyl groups within the SPI backbone and the inclusion of wide bandgap hafnium dioxide(HfO_(2))*** nanocomposite has demonstrated notable enhancements in thermal stability,dielectric properties,and capacitive performance at elevated *** simulations at both molecular and mesoscopic levels have elucidated the mechanisms behind these improvements,which could be attributed to confined segmental motion,an optimized electronic band structure,and a diminished incidence of dielectric breakdown ascribed to the presence of sulfonyl ***,the SPI-HfO_(2)nanocomposite demonstrates a high charge-discharge efficiency of 95.7%at an elevated temperature of 150℃and an applied electric field of 200 MV/***,it achieves a maximum discharged energy density of 2.71 J/cm^(3),signalling its substantial potential for energy storage applications under extreme conditions.

关键词： dielectric polymer nanocomposites high-temperature high dielectric constant sulfonyl groups energy storage performance

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A seven-crystal spectrometer for high-energy resolution X-ray spectroscopy at Shanghai Synchrotron Radiation Facility

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Nuclear Science and Techniques 2024年第9期35卷 82-91页

作者： bing-Bao Mei Liang-Xin Wang Song-Qi Gu xiao-Zhi Su Shuo Zhang yao Wei Jing-Yuan Ma Zheng Jiang Fei Song Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201800China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China

A Johann-type X-ray spectrometer was successfully developed at the hard X-ray branch(in-vacuum undulator with a 24-mm periodic length)of the energy material beamline(E-line)at the Shanghai Synchrotron Radiation Facility(SSRF).This spectrometer was utilized to implement X-ray emission spectroscopy(XES),high-energy resolution fluorescence-detected X-ray absorption spectroscopy(HERFD-XAS),and resonant inelastic X-ray *** spherically bent crystals were positioned on the respective vertical 500-mm-diameter Rowland circles,adopting an area detector to increase the solid angle to 1.75%of 4πsr,facilitating the study of low-concentrate systems under complex reaction *** under the atmosphere pressure,the spectrometer covers the energy region from 3.5 to 18 keV,with the Bragg angle ranging from 73°to 86°during vertical *** offers a promised energy resolution of sub-eV(XES)and super-eV(HERFD-XAS).Generally,these comprehensive core-level spectroscopy methods based on hard X-rays at the E-line with an extremely high photon flux can meet the crucial requirements of a green energy ***,they provide substantial support for scientific advances in fundamental research.

关键词： X-ray emission spectroscopy High-energy-resolution X-ray spectrometer Johann geometry Energy materials SSRF

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Uniqueness on Difference Operators of Meromorphic Functions of Infinite Order

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Acta Mathematica Sinica,English Series 2024年第2期40卷 511-527页

作者： Hui LI Ming Liang FANG xiao yao School of Science China University of Mining and TechnologyBeijing 100083P.R.China Institute of Mathematics Academy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100190P.R.China School of Sciences Hangzhou Dianzi UniversityHangzhou 310012P.R.China School of Mathematical sciences and LPMC Nankai UniversityTianjin 300071P.R.China

We investigate the uniqueness problems of meromorphic functions and their difference operators by using a new *** is proved that if a non-constant meromorphic function f shares a non-zero constant and ∞ counting multiplicities with its difference operators Δcf(z) and Δ_(c)^(2)f(z), thenΔcf(z)≡Δ_(c)^(2)f(z).In particular,we give a difference analogue of a result of *** method has two distinct features:(ⅰ) It converts the relations between functions into the corresponding *** makes it possible to deal with the uniqueness problem by linear algebra and combinatorics.(ⅱ) It circumvents the obstacle of the difference logarithmic derivative lemma for meromorphic functions of infinite order,since this method does not depend on the growth of the ***,the idea in this paper can also be applied to the case for several variables.

关键词： Uniqueness meromorphic functions difference operators infinite order

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Highly Thermoconductive,Strong Graphene‑Based Composite Films by Eliminating Nanosheets Wrinkles

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Nano-Micro Letters 2024年第1期16卷 328-340页

作者： Guang xiao Hao Li Zhizhou Yu Haoting Niu Yagang yao College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNational Laboratory of Solid State MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China Institute of Laser Manufacturing Henan Academy of SciencesZhengzhou 450052People’s Republic of China Center for Quantum Transport and Thermal Energy Science School of Physics and TechnologyNanjing Normal UniversityNanjing 210023People’s Republic of China

Graphene-based thermally conductive composites have been proposed as effective thermal management materials for cooling high-power electronic ***,when flexible graphene nanosheets are assembled into macroscopic thermally conductive composites,capillary forces induce shrinkage of graphene nanosheets to form wrinkles during solution-based spontaneous drying,which greatly reduces the thermal conductivity of the ***,graphene nanosheets/aramid nanofiber(GNS/ANF)composite films with high thermal conductivity were prepared by in-plane stretching of GNS/ANF composite hydrogel networks with hydrogen bonds andπ-π*** in-plane mechanical stretching eliminates graphene nanosheets wrinkles by suppressing inward shrinkage due to capillary forces during drying and achieves a high in-plane orientation of graphene nanosheets,thereby creating a fast in-plane heat transfer *** composite films(GNS/ANF-60 wt%)with eliminated graphene nanosheets wrinkles showed a significant increase in thermal conductivity(146 W m^(−1)K^(−1))and tensile strength(207 MPa).The combination of these excellent properties enables the GNS/ANF composite films to be effectively used for cooling flexible LED chips and smartphones,showing promising applications in the thermal management of high-power electronic devices.

关键词： Graphene Aramid nanofiber Wrinkles elimination In-plane stretching Thermal conductivity

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Graphene-anchored sodium single atoms:A highly active and stable catalyst for transesterification reaction

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Nano Research 2024年第6期17卷 4979-4985页

作者： Song-Song Peng yao Nian Xing-Ru Song Xiang-Bin Shao Chen Gu Zhi-Wei Xing Shi-Chao Qi Peng Tan You Han xiao-Qin Liu Lin-bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech University30 South Puzhu RoadNanjing 211816China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Solid strong base catalysts have received considerable attention in various organic reactions due to their facile separation,neglectable corrosion,and environmental *** great progress has been made in the preparation of solid strong base catalysts,it is still challenging to avoid basic sites aggregation on support and active sites loss in reaction ***,we report a tandem redox strategy to prepare Na single atoms on graphene,producing a new kind of solid strong base catalyst(Na1/G).The base precursor NaNO_(3)was first reduced to Na2O by graphene(400℃)and successively to single atoms Na anchored on the graphene vacancies(800℃).Owing to the atomically dispersed of basicity,the resultant catalyst presents high activity toward the transesterification of methanol and ethylene carbonate to synthesize dimethyl carbonate(turnover frequency(TOF)value:125.7 h^(−1)),which is much better than the conventional counterpart Na2O/G and various reported solid strong bases(TOF:1.0-90.1 h^(−1)).Furthermore,thanks to the basicity anchored on graphene,the Na1/G catalyst shows excellent durability during *** work may provide a new direction for the development of solid strong base catalysts.

关键词： solid strong base catalyst basic sites redox graphene single Na atoms

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