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RuCo alloy nanoparticles embedded within N-doped porous two-dimensional carbon nanosheets:a high-performance hydrogen evolution reaction catalyst

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Tungsten 2024年第1期6卷 114-123页

作者： Jin-Hui Wang Shao-Wei Yang Fu-Bin Ma Yi-Ke Zhao Shi-Nuo Zhao Zheng-Yu Xiong Dong Cai Hai-Dong Shen Kai Zhu Qiu-Yu zhang Yue-Ling Cao Tian-Shuai Wang He-peng zhang Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Xi’an Key Laboratory of Functional Organic Porous Materials School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710129China School of Power and Energy Northwestern Polytechnical UniversityXi’an 710129China Chongqing Science and Technology Innovation Center of Northwestern Polytechnical University Chongqing 401135China

Developing cost-effective electrocatalysts with high activity and stability especially at high current density is of great significance for the large-scale commercial application of electrochemical water splitting to hydrogen production but still remains ***,we report an effective confinement pyrolysis strategy to fabricate embedded ruthenium-cobalt nanoclusters supported on N-doped porous two-dimensional carbon nanosheets(RuCo@CN).Markedly,the embedded structure can effectively prevent the migration,agglomeration,and leaching of nanoparticles,thus endowing the RuCo@CN catalyst with high *** be exact,high stability with up to 650 h can be achieved at high current density(-500 and-1000 mA·cm^(-2)).Besides,the RuCo@CN catalysts also exhibit highly reactive with low overpotentials of only 11mV at-10 mA·cm^(-2).Density functional theory calculations reveal that the introduction of cobalt reduces the decomposition barrier of H_(2)O for RuCo@CN alloy,thus promoting hydrogen evolution reaction.

关键词： Hydrogen evolution reaction Confinement pyrolysis strategy Mosaic structure Stability

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基于选区激光熔化镍基单晶高温合金的修复

中国有色金属学报 2024年第4期34卷 1376-1392页

作者：张宇沈超张鹏章林曲选辉北京科技大学新材料技术研究院北京100083 北京科技大学北京材料基因组高精尖创新中心北京100083 辽宁材料实验室材料智能技术研究所沈阳110000

选区激光熔化技术光斑和热影响区小,成形精度高,可对镍基单晶高温合金叶片进行有效的修复以延长使用寿命。本工作选用了一种具有中等体积分数γ′相的合金粉末,研究了在单晶CM247LC基板上进行外延生长过程中该合金粉末的显微组织演变规... 详细信息

选区激光熔化技术光斑和热影响区小,成形精度高,可对镍基单晶高温合金叶片进行有效的修复以延长使用寿命。本工作选用了一种具有中等体积分数γ′相的合金粉末,研究了在单晶CM247LC基板上进行外延生长过程中该合金粉末的显微组织演变规律以及力学性能。结果表明:修复界面的熔池宽深比大于4时,沉积区与基体能形成良好的结合界面以及较小的晶粒取向差。通过增大扫描速率和降低激光功率可以有效减小沉积区裂纹密度,沉积组织以沿沉积方向生长的柱状枝晶为主,沉积层越高,冷却速率越小,枝晶间距和晶粒取向差越大。通过打印参数优化,最终得到了裂纹密度低、晶粒取向单一、且与单晶基板结合优异的镍基单晶高温合金沉积层,其抗拉强度为1094 MPa,伸长率为21%。

关键词：镍基单晶高温合金选区激光熔化显微组织晶粒取向力学性能

须弥华藏:莫高窟隋初第302、303窟中心柱形象意涵新探

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南京艺术学院学报（美术与设计） 2024年第4期 152-160,I0003页

作者：张鹏中央美术学院人文学院北京100102

莫高窟302与303窟作为莫高窟仅有的两例倒圆锥形中心柱窟,其中心柱形式却颇为罕见。目前学界多将其比定为须弥山中心柱,并从须弥山世界的形态、整体的同心圆结构、中心柱与周边千佛的联系等诸多角度尝试对其进行讨论,但仍不乏经意阐释... 详细信息

莫高窟302与303窟作为莫高窟仅有的两例倒圆锥形中心柱窟,其中心柱形式却颇为罕见。目前学界多将其比定为须弥山中心柱,并从须弥山世界的形态、整体的同心圆结构、中心柱与周边千佛的联系等诸多角度尝试对其进行讨论,但仍不乏经意阐释与观察上的不足。本文通过对302窟303窟形制的重新观察,结合对二者的形象对比与关键细节的梳理,探讨其表现华严思想下华藏世界的形象可能。

关键词：莫高窟第302、第303窟中心柱形象须弥山华藏世界华严宗

基础摆动条件下电磁轴承-柔性转子系统的加速度前馈振动抑制

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振动工程学报 2024年第8期37卷 1269-1280页

作者：张鹏祝长生浙江大学电气工程学院浙江杭州310027

旋转机械基础的摆动会给转子系统带来附加的陀螺力矩和惯性载荷,影响转子系统的振动及稳定性,甚至影响转子的正常运行。为了有效控制电磁轴承‐柔性转子系统在基础摆动下的振动,提出了一种基于基础加速度的前馈补偿控制方法。该方法基... 详细信息

旋转机械基础的摆动会给转子系统带来附加的陀螺力矩和惯性载荷,影响转子系统的振动及稳定性,甚至影响转子的正常运行。为了有效控制电磁轴承‐柔性转子系统在基础摆动下的振动,提出了一种基于基础加速度的前馈补偿控制方法。该方法基于柔性转子系统动力学模型以及基础摆动的信息,可直接得到抑制转子振动所需的最佳补偿电流,无需迭代和复杂的控制器结构,因此具有较强的快速性和实用性。为了消除建模误差对前馈补偿控制性能的影响,给出了对补偿电流进行修正的方法。仿真分析了补偿算法对转子振动的抑制效果。在搭建的电磁轴承‐柔性转子系统基础运动试验平台上,进行了基础摆动条件下转子悬浮、恒速、加速运行时的振动控制有效性试验。理论和试验结果一致,表明基础摆动产生的附加惯性载荷会使电磁轴承‐柔性转子系统在垂直于摆动方向上的振动明显增大,产生的附加陀螺力矩会使沿摆动方向的振动有所增大,且增加的幅度随转子转速的升高而增大。在包含一阶弯曲临界转速的转速范围内,基础加速度前馈补偿控制对基础摆动条件下的转子振动均有显著的抑制效果。

关键词：振动抑制电磁轴承基础摆动前馈补偿

同方期刊数据库博看期刊

A multicenter uroflowmetry study of healthy women in China

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Chinese Medical Journal 2024年第10期137卷 1225-1227页

作者： Xiaodong Liu Lingfeng Meng Jiawen Wang Tianming Ma Benkang Shi Hai Huang Qingwei Wang Min Chen Limin Liao Hong Shen Zhongqing Wei Yuansong Xiao Tiejun Pan Jian Ren peng zhang Xiaojun Tian Yaoguang zhang Department of Urology Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Graduate School of Peking Union Medical College Beijing 100730China Department of Urology Qilu HospitalShandong UniversityJinanShandong 250013China Department of Urology SUN YAT-SEN Memorial HospitalGuangzhouGuangdong 510235China Department of Urology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan 450003China Department of Urology Tongji HospitalTongji Medical College of Huazhong University of Science and TechnologyWuhanHubei 430030China Department of Urology China Rehabilitation Research CenterBeijing 100068China Department of Urology West China HospitalChengduSichuan 610041China Department of Urology The Second Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu 210011China Department of Urology General Hospital of Southern Theatre CommandGuangzhouGuangdong 510010China Department of Urology General Hospital of Central Theatre CommandWuhanHubei 430071China Department of Urology China-Japan Friendship HospitalBeijing 100029China Department of Urology Beijing Chao-Yang HospitalBeijing 100027China Department of Urology Peking University Third HospitalBeijing 100191China

Uroflowmetry is an uroflow measurement technique used to record the voided volume(VV)and flow rate,which can help clinicians objectively evaluate lower urinary tract ***,few uroflowmetry studies have focused on the female population,[1]especially on the uroflow curve standard ***,we sought to establish dependable uroflow reference values and nomograms for Chinese women and to evaluate the relationship between uroflow patterns and demographic data.

关键词： function. flowmetry analysis.

Decoupling of temporal/spatial broadening effects in Doppler wind LiDAR by 2D spectral analysis

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Chinese Physics B 2024年第3期33卷 447-452页

作者：刘珍张云鹏竹孝鹏刘继桥毕德仓陈卫标 Space Laser Engineering Department Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Pulse echo accumulation is commonly employed in coherent Doppler wind LiDAR(light detection and ranging)under the assumption of steady ***,the measured spectral data are analyzed in the time dimension and frequency dimension to cope with the temporal wind shear and achieve the optimal accumulation time.A hardware-efficient algorithm combining the interpolation and cross-correlation is used to enhance the wind retrieval accuracy by reducing the frequency sampling interval and then reduce the spectral width calculation ***,the temporal broadening effect and spatial broadening effect are decoupled according to the strategy we developed.

关键词： Doppler wind LiDAR spectral analysis hardware efficiency spectrum broadening effects

Three novel rare TP53 fusion mutations in a patient with multiple primary cancers:a case report

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Oncology and Translational Medicine 2024年第1期10卷 47-51页

作者： Mengyao Lu Xuemei zhang Qian Chu Yuan Chen peng zhang Department of Oncology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

As survival rates improve and detection technologies advance,the occurrence of multiple primary cancers(MPCs)has been *** 16%of cancer survivors develop a subsequent malignancy,with lung cancer often developing after esophageal cancer due to potential“field cancerization”*** this observation,the genetic heterogeneity underlying MPCs remains ***,the recent emergence of genetic testing has expanded the scope of investigations into MPCs to investigate signatures underlying cancer *** report reveals 3 unprecedented TP53 fusion mutations in a Chinese patient afflicted by MPCs,namely,AP1M2–TP53(A1;T11)fusion,TP53–ILF3(T10;I13)fusion,and SLC44A2–TP53(S5;T11)*** patient exhibited an extended period of survival after diagnosis of extensive-stage small cell lung cancer,which occurred 6 years after the diagnosis of esophageal squamous cell *** unique reportmay provide supplementary data that enhance our understanding of the genetic landscape ofMPCs.

关键词： Multiple primary cancers TP53 fusion mutation Esophageal squamous cell cancer Extensive-stage small cell lung cancer Immunotherapy Antiangiogenic therapy

倾斜椭球凹陷阵列湍流强化传热实验与数值分析

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推进技术 2024年第4期45卷 144-152页

作者：许超张鹏饶宇上海交通大学机械与动力工程学院上海200240

为了提高涡轮叶片内部通道对流传热性能,本文基于瞬态液晶热像技术分别针对矩形通道表面排布的球形凹陷和斜椭球凹陷阵列的传热和压力损失特性进行了实验研究。在雷诺数为1×10^(4)~6×10^(4)内,与基准球形凹陷相比,平行排布和V形排布... 详细信息

为了提高涡轮叶片内部通道对流传热性能,本文基于瞬态液晶热像技术分别针对矩形通道表面排布的球形凹陷和斜椭球凹陷阵列的传热和压力损失特性进行了实验研究。在雷诺数为1×10^(4)~6×10^(4)内,与基准球形凹陷相比,平行排布和V形排布的斜椭球凹陷总体传热分别增强了23.8%~33.8%和104%~121%,V形排布的斜椭球凹陷综合传热性能显著提高了25%~68.3%。通过数值模拟发现,平行排布的斜椭球凹陷虽然可以诱发更强烈的二次流,但是平行的排布方式使下游凹陷受到来自上游凹陷升温后的流体冲刷,因此限制了传热的进一步增强。V形排布的斜椭球凹陷通过诱发大尺度的纵向涡对将来自主流的冷流体输运至壁面,冷流体直接冲击壁面并与近壁流体剪切,极大地增强了对流传热。

关键词：涡轮叶片冷却斜椭球凹陷传热瞬态液晶热像实验流动结构

GATIS score for predicting the prognosis of rectal neuroendocrine neoplasms:A Chinese multicenter study of 12-year experience

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World Journal of Gastroenterology 2024年第28期30卷 3403-3417页

作者： Xin-Yu Zeng Ming Zhong Guo-Le Lin Cheng-Guo Li Wei-Zhong Jiang Wei zhang Li-Jian Xia Mao-Jun Di Hong-Xue Wu Xiao-Feng Liao Yue-Ming Sun Min-Hao Yu Kai-Xiong Tao Yong Li Rui zhang peng zhang Department of Gastrointestinal Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430074Hubei ProvinceChina Department of Gastrointestinal Surgery Renji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200127China Department of General Surgery Peking Union Medical College HospitalPeking Union Medical CollegeBeijing 100730China Department of Colorectal Surgery Fujian Medical UniversityFuzhou 350401Fujian ProvinceChina Department of Colorectal Surgery Changhai HospitalShanghai 200433China Department of Gastrointestinal Surgery The First Affiliated Hospital of Shandong First Medical UniversityJinan 250118Shandong ProvinceChina Department of Gastrointestinal Surgery Taihe HospitalHubei University of MedicineShiyan 442099Hubei ProvinceChina Department of Gastrointestinal Surgery I Section Renmin Hospital of Wuhan UniversityWuhan 430060Hubei ProvinceChina Department of General Surgery Xiangyang Central HospitalAffiliated Hospital of Hubei University of Arts and ScienceXiangyang 441021Hubei ProvinceChina Department of Colorectal Surgery Jiangsu Province HospitalNanjing Medical UniversityNanjing 210029Jiangsu ProvinceChina Department of Gastrointestinal Surgery School of MedicineShanghai Jiao Tong UniversityShanghai 200127China Department of General Surgery Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080Guangdong ProvinceChina Department of Colorectal Surgery Liaoning Cancer HospitalShenyang 110042Liaoning ProvinceChina

BACKGROUND There is currently a shortage of accurate,efficient,and precise predictive instruments for rectal neuroendocrine neoplasms(NENs).AIM To develop a predictive model for individuals with rectal NENs(R-NENs)using data from a large *** Data from patients with primary R-NENs were retrospectively collected from 17 large-scale referral medical centers in *** forest and Cox proportional hazard models were used to identify the risk factors for overall survival and progression-free survival,and two nomograms were *** A total of 1408 patients with R-NENs were *** grade,T stage,tumor size,age,and a prognostic nutritional index were important risk factors for *** GATIS score was calculated based on these five *** overall survival prediction,the respective C-indexes in the training set were 0.915(95%confidence interval:0.866-0.964)for overall survival prediction and 0.908(95%confidence interval:0.872-0.944)for progression-free survival *** to decision curve analysis,net benefit of the GATIS score was higher than that of a single *** time-dependent area under the receiver operating characteristic curve showed that the predictive power of the GATIS score was higher than that of the TNM stage and pathological grade at all time *** The GATIS score had a good predictive effect on the prognosis of patients with R-NENs,with efficacy superior to that of the World Health Organization grade and TNM stage.

关键词： Rectal neuroendocrine neoplasm Nomogram Random forest Prognosis Overall survival Progression-free survival