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Coupled CFD-DEM Numerical Simulation of the Interaction of a Flow-Transported Rag with a Solid Cylinder

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Fluid Dynamics & Materials Processing 2024年第7期20卷 1593-1609页

作者： yun ren Lianzheng Zhao Xiaofan Mo Shuihua Zheng Youdong Yang Zhijiang College Zhejiang University of TechnologyShaoxing312030China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou310032China

A coupled Computational Fluid Dynamics-Discrete Element Method(CFD-DEM)approach is used to calculate the interaction of a flexible rag transported by a fluid current with a fixed solid *** specifically a hybrid Eulerian-Lagrangian approach is used with the rag being modeled as a set of interconnected *** influence of various parameters is considered,namely the inlet velocity(1.5,2.0,and 2.5 m/s,respectively),the angle formed by the initially straight rag with the flow direction(45°,60°and 90°,respectively),and the inlet position(90,100,and 110 mm,respectively).The results show that the flow rate has a significant impact on the permeability of the *** higher the flow rate,the higher the permeability and the rag speed *** angle has a minor effect on rag permeability,with 45°being the most favorable angle for *** inlet position has a small impact on rag permeability,while reducing the initial distance between the rag an the cylinder makes it easier for rags to pass through.

关键词： Rag flow around cylinder flow characteristics numerical simulation

Microstructure Evolution of a Single Crystal Nickel-Base Superalloy During Heat Treatment and Creep

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材料热处理学报 2004年第5期25卷 80-82页

作者： YANGDa-yun JINTao ZHAONai-ren WANGZhi-hui SUNXiao-feng GUANHeng-rong HUZhuang-qi InstituteofMetalResearch ChineseAcademyofSciencesShenyangChina

Microstructure evolution of a single crystal nickel-base superalloy during heat treatment and tensile creep at 1010°C and 248 MPa for 30h was observed and analyzed. Internal stresses because of lattice mismatch between and / phase provided the driving force for / shape evolution during heat treatment. More than 65 vol. % distorted cubic phase keeping coherency with the y matrix precipitated after solution at 1295°C for 32h. The shape of phase was perfectly cubic with increasing precipitate size during the two-step aging treatment. Due to the applied stress and internal stress field the continuous y1/ lamellar structure perpendicular to the applied stress was formed after 30h tensile creep.

关键词：显微结构热处理拉伸蠕变单晶镍超级合金

Efficacy of digital breast tomosynthesis combined with magnetic resonance imaging in the diagnosis of early breast cancer

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World Journal of Clinical Cases 2022年第28期10卷 10042-10052页

作者： yun ren Jiao Zhang Jin-Dan Zhang Jian-Zhong Xu Department of Breast Surgery Changzhi People's Hospital Affiliated to Shanxi Medical UniversityChangzhi 046000Shanxi ProvinceChina Department of Diagnostic Radiology Changzhi People's Hospital Affiliated to Shanxi Medical UniversityChangzhi 046000Shanxi ProvinceChina

BACKGROUND The incidence and mortality rate of breast cancer in China rank 120th and 163rd,worldwide,*** incidence of breast cancer is on the rise;the risk increases with age but is slightly reduced after *** screening,diagnosis,and timely determination of the best treatment plan can ensure clinical efficacy and *** To evaluate the clinical value of magnetic resonance imaging(MRI) combined with digital breast tomosynthesis(DBT) in diagnosing early breast cancer and the effect of breast-conserving surgery by arc *** This study was divided into two ***,110 patients with early breast cancer confirmed by pathological examination and 110 with benign breast diseases diagnosed simultaneously in Changzhi People’s Hospital of Shanxi Province and Shanxi Dayi Hospital from May 2019 to September 2020 were included in the breast cancer group and the benign group,*** groups underwent DBT and MRI examination,and the pathological results were used as the gold standard to evaluate the effectiveness of the combined application of DBT and MRI in the diagnosis of early breast ***,according to the operation method,110 patients with breast cancer were divided into either a breast-conserving group(69 patients) or a modified radical mastectomy group(41 patients).The surgical effect,cosmetic effect,and quality of life of the two groups were *** Among the 110 cases of breast cancer,66 were of invasive ductal carcinoma(60.00%),and 22 were of ductal carcinoma in situ(20.00%).Among the 110 cases of benign breast tumors,55 were of breast fibromas(50.00%),and 27 were of breast adenosis(24.55%).The sensitivity,specificity,and area under the curve(AUC) of DBT in the differential diagnosis of benign and malignant breast tumors were 73.64%,84.55%,and 0.791,*** sensitivity,specificity,and AUC of MRI in the differential diagnosis of benign and malignant breast tumors were 84.55%,85.45%,and 0.85

关键词： Breast cancer Magnetic resonance Digital mammography Clinical value Arc incision Breastconserving surgery Digital breast tomosynthesis

CO_(2) Adducts of the Amino and Imino Groups Studied by ~1HNMR and ^(13)CNMR

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Chinese Chemical Letters 2001年第4期12卷 283-286页

作者： Zhen CHEN ren yun WANG Li Lian ZHU Xiao Tian LIANG Institute of Materia Medica Peking Union Medical CollegeThe Chinese Academy of Medical SciencesBeijing 100050

CO2 adducts of L-(+)-asparaginic acid and some polyhydroxylated alkaloids was studied by 1HNMR and 13CNMR in this paper.

关键词： Carbamate CO_(2) adduct 13CNMR 1HNMR polyhydroxylated alkaloid.

Formation of Carbon Nitride Films by Nitrogen Ion Bombardment on C_(60) Films

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Chinese Physics Letters 1996年第9期13卷 714-717页

作者： ren Zhong-min DU Yuan-cheng YING Zhi-feng LI Fu-ming LIN Jing ren yun-Zhu ZONG Xiang-fu Department of Physics Fudan UniversityState Key Joint Laboratory for Materials Modification by LaserIonand Electron BeamsShanghai 200433 Institute of Materials Science Fudan UniversityShanghai 200433

The synthesis of covalent carbon nitride films becomes an important subject in the materials research *** a new synthetic method two low-energy(400 and 1000eV)nitrogen ion beams are used to bombard on C_(60) thin films *** bombarded films are used for Raman and x-ray photoelectron spectroscopy(XPS)*** results of the analyses show that under the bombardment of 400eV nitrogen ion beam,the film still contains a large amount of undestructed C_(60) *** the case of l000eV bombardment,only a little amount of C_(60) molecules is kept *** experimental results also show that the destructed carbon species will combine chemically with nitrogen ions to form stable covalent carbon nitride,confirmed by the Raman peaks of,e.g.,*** XPS Nls and Cls lines also indicate the formation of covalent carbon nitride in the bombarded films.

关键词： field carbon chemically

Ion-Beam Bombarding Effects on Deposition of Carbon Nitride Films by Laser Ablation

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Chinese Physics Letters 1996年第11期13卷 878-880页

作者： YING Zhi-feng ren Zhong-min DU Yuan-cheng LI Fu-ming LIN Jing ren yun-zhu ZONG Xiang-fu Department of Physics and State Key Lab oratory for Materials Modification by LaserIon and Electron beamsFudan UniversityShanghai 200433 Institute of Materials Science Fudan UniversityShanghai 200433

In order to obtain high quality carbon nitride films,x-ray photoelectron spectroscopy and Raman spectrum were used to analyze several kinds of film:(a)laser-ablated amorphous carbon(a-C)films,(b)a-C films after a 1 keV nitrbgen ion beam bombardment.(c)carbon nitride(CN_(x))films synthesized by ablation assisted with ion beam bombardment,(d)CN_(x) films after a 50eV nitrogen ion beam bombardment,and(e)CN_(x) films after a 1 keV nitrogen ion beam *** comparison among these films showed that the concurrent deposition of CN_(x) films by ablation and a nitrogen ion beam should be better than the post-treatment of a-C films by nitrogen ion beam *** the case of concurrent deposited CN_(x) films,a post-treatment by a nitrogen ion beam bombardment with an appropriate energy(possibly less than 1 keV)was proposed to improve the ratio of C-N binding structures in the deposited films.

关键词： beam films amorphous

Selective extraction of flavonoids from Ginkgo biloba leaves using human serum albumin functionalized magnetic nanoparticles

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Chinese Chemical Letters 2013年第12期24卷 1099-1102页

作者： Xiao-yun ren Ying Xue Jian Liang Li-Sheng Ding Xun Liao Chengdu Institute of Biology Chinese Academy of Sciences

In a novel procedure, human serum albumin timctionalized magnetic nanoparticles （ HSA-MNPS ） were used to selectively extract nine flavonoids in the extract of Ginkgo biloba leaves. The chemical structures of those flavonoids were characterized with high performance liquid chromatography coupled with mass spectrometry （HPLC-MS）. The selective extraction with HSA-MNPs coupled with structural elucidation with HPLC-MS shows powerful potential for analysis of bioactive components in traditional Chinese medicines.

关键词： Ginkgo biloba Flavonoids HSA-MNPs High performance liquid chromatography Mass spectrometry

Chemical Modification of EVA for DrugRelease Application

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Chemical Research in Chinese Universities 1995年第1期11卷 87-90页

作者： HU yun-hua and ZHUO ren-xi(Deparrment of Chemistry, Wuhan Uniuersity, Wuhan,430072) WUHAN UNIV DEPT CHEMWUHAN 430072PEOPLES R CHINA

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关键词： EVA Drug release Enoxacin Levonorgesterel

Grain-filling characteristics and yield differences of maize cultivars with contrasting nitrogen efficiencies

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The Crop Journal 2020年第6期8卷 990-1001页

作者： Qiang Li Lunjing Du Dongju Feng yun ren Zhexin Li Fanlei Kong Jichao Yuan Chongqing Key Laboratory of Economic Plant Biotechnology Collaborative Innovation Center of Special Plant Industry in ChongqingInstitute of Special PlantsChongqing University of Arts and SciencesYongchuan402160 ChongqingChina Key Laboratory of Crop Ecophysiology and Farming System in Southwest China Ministry of AgricultureSichuan Agricultural UniversityChengdu 611130SichuanChina

To investigate the effect of nitrogen management on the grain-filling characteristics and yield formation of maize cultivars with contrasting nitrogen efficiencies,and to identify differences in grain-filling characteristics and yield of maize cultivars in response to nitrogen management,a two-year field experiment was conducted in southwest China in2015–*** grain-filling rate and duration of the N-inefficient cultivar XY 508 were higher than those of the N-efficient cultivar ZH *** 100-kernel weight of XY 508 was significantly higher than that of ZH *** kernel number per ear of ZH 311 was significantly higher than that of XY 508,making the population filling rate of ZH 311 significantly higher than that of XY *** higher population filling rate of the N-efficient maize cultivar led to a significant yield advantage over the N-inefficient maize *** management effectively improved maize grain yield,but the response of maize cultivars with contrasting nitrogen efficiencies to nitrogen management was inconsistent.A basal fertilizer ratio 60.43%with a topdressing ratio 39.57%effectively increased grainfilling rate,delayed the time to maximum filling rate,prolonged the active filling period and effective grain-filling time,increased the 100-kernel weight,and maintained higher kernels per ear,thereby improving the population filling rate and maximizing the yield advantage of the N-efficient cultivar.A 100%basal fertilizer ratio not only increased the number of kernels per ear,but also maintained high grain filling characteristics to obtain a higher 100-kernel weight and increased the population filling rate,leading to a high grain yield in the N-inefficient ***,the 100%basal fertilizer ratio partially compensated for the deficient grain yield of the N-inefficient cultivar.

关键词： Maize Grain filling Nitrogen management Yield Population filling rate