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南方某高铁主站房屋面虹吸雨水排水系统研究

科技通报 2024年第2期40卷 45-48页

作者：韩锋李晓阁陈剑溪王硕王锦王文瑾中铁建设集团有限公司北京100040 北京交通大学环境学院北京100044

南方某高铁站作为华南地区核心交通枢纽,承担繁重的客运任务。站房作为高铁站的主体建筑,该建筑面积较大,屋顶设计坡度较小,雨水排放存在一定压力。更为严重的是,在遇到雨水天气时,由于倾斜角度不够大,雨水可能会倒灌而进入室内,引发安... 详细信息

南方某高铁站作为华南地区核心交通枢纽,承担繁重的客运任务。站房作为高铁站的主体建筑,该建筑面积较大,屋顶设计坡度较小,雨水排放存在一定压力。更为严重的是,在遇到雨水天气时,由于倾斜角度不够大,雨水可能会倒灌而进入室内,引发安全隐患。为解决这一问题,该站房采用了2套独立的虹吸雨水排水系统。本文以主站房屋面虹吸系统设计为基础,深入分析天沟挡水板的设计参数和汇水系统的整体结构;通过在屋面结构最低点处,计算校核管道系统的水力,系统地分析不同节点压力值、水头损失对虹吸系统运行维护的影响。同时,针对排水系统中可能存在的问题,提出可行性建议。以期为其他高铁站的屋面排水系统设计提供理论支撑,推动虹吸雨水排水系统的深入研究,以应对不同环境条件下的雨水排放问题。

关键词：虹吸排水系统主站房屋面天沟水力计算

不同椎弓根螺钉内固定治疗脊柱骨折患者的效果

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中外医学研究 2024年第27期22卷 72-76页

作者：黄建清张佳榕徐朝和陈建喜林晓阳泉州市泉港区医院福建泉州362100

目的:观察不同椎弓根螺钉内固定治疗脊柱骨折患者的效果。方法:选取2020年2月—2023年4月泉州市泉港区医院收治的80例脊柱骨折患者为研究对象,将其随机分为对照组(n=40)和研究组(n=40)。对照组予以开放式内固定术,研究组予以Sextant微... 详细信息

目的:观察不同椎弓根螺钉内固定治疗脊柱骨折患者的效果。方法:选取2020年2月—2023年4月泉州市泉港区医院收治的80例脊柱骨折患者为研究对象,将其随机分为对照组(n=40)和研究组(n=40)。对照组予以开放式内固定术,研究组予以Sextant微创内固定术。比较两组临床疗效、手术相关指标、脊柱生理指标、炎症指标水平、氧化应激指标水平、功能障碍及疼痛程度情况。结果:研究组治疗有效率高于对照组,差异有统计学意义(P<0.05);研究组手术切口长度、术中出血量及引流量少于对照组,手术和住院时间短于对照组,差异有统计学意义(P<0.05);手术治疗后,两组Cobb’s角、椎体矢状面指数以及椎体前缘高度明显改善,且研究组改善情况优于对照组,差异有统计学意义(P<0.05);手术治疗后1周,两组白介素-6(IL-6)、C-反应蛋白(CRP)表达水平明显降低,谷胱甘肽过氧化物酶(GSH-Px)和高级氧化蛋白产物(AOPP)表达水平明显升高,且研究组IL-6、CRP水平低于对照组,GSH-Px和AOPP水平高于对照组,差异有统计学意义(P<0.05);手术治疗后3个月,两组ODI和视觉模拟评分量表(VAS)评分明显降低,且研究组低于对照组,差异有统计学意义(P<0.05)。结论:与采用开放式内固定术治疗相比,Sextant微创内固定术的治疗效果更为显著,该种术式可缩短手术时间,控制炎症和氧化应激指标,减轻术后疼痛,可促进患者加速康复。

关键词： Sextant微创内固定术开放式内固定术脊柱骨折炎症因子氧化应激临床疗效

Metal–organic framework wafer enabled fast response radiation detection with ultra-low dark current

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Nano Research 2024年第4期17卷 2988-2993页

作者： Meng Xu jianxi Liu Wei Wu Yang chen Donghao Ma Sixin chen Wanqi Jie Menghua Zhu Yadong Xu State Key Laboratory of Solidification Processing MIIT Key Laboratory of Radiation Detection Materials and Devices&School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Semiconductive metal–organic frameworks(MOFs)have attracted great interest for the electronic ***,dark currents of present hybrid organic–inorganic materials are 1000–10,000 times higher than those of commercial inorganic detectors,leading to poor charge ***,we demonstrate a ZIF-8(Zn(mim)_(2),mim=2-methylimidazolate)wafer with ultra-low dark current of 1.27 pA·mm^(-2) under high electric fields of 322 V·mm^(-1).The isostatic pressing preparation process provides ZIF-8 wafers with good ***,the presence of redox-active metals and small spatial separation between components promotes the charge *** ZIF-8-based semiconductor detector shows promising X-ray detection sensitivity of 70.82μC·Gy^(-1)·cm^(-2) with low doses exposures,contributing to superior X-ray imaging capability with a relatively high spatial resolution of 1.2 lp·mm^(-1).Simultaneously,good peak discrimination with the energy resolution of~43.78%is disclosed when the detector is illuminated by uncollimated 241Am@5.48 MeVα-*** results provide a broad prospect of MOFs for future radiation detection applications.

关键词： MOFs lead-free α-particles X-ray detection and imaging dark current fast response

The Immense Impact of Reverse Edges on Large Hierarchical Networks

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Engineering 2024年第5期36卷 240-249页

作者： Haosen Cao Bin-Bin Hu Xiaoyu Mo Duxin chen jianxi Gao Ye Yuan Guanrong chen Tamás Vicsek Xiaohong Guan Hai-Tao Zhang MOE Engineering Research Center of Autonomous Intelligent Unmanned Systems State Key Laboratory of Intelligent Manufacturing Equipment and TechnologySchool of Artificial Intelligence and AutomationHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore Jiangsu Key Laboratory of Networked Collective Intelligence School of MathematicsSoutheast UniversityNanjing 210096China Department of Computer Science Rensselaer Polytechnic InstituteTroyNY 12180USA Department of Electronic Engineering City University of Hong KongHong Kong 999077China Department of Biological Physics Eötvös UniversityBudapest 1117Hungary MOE Key Laboratory for Intelligent Networks and Network Security School of Automation Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Hierarchical networks are frequently encountered in animal groups,gene networks,and artificial engineering systems such as multiple robots,unmanned vehicle systems,smart grids,wind farm networks,and so *** structure of a large directed hierarchical network is often strongly influenced by reverse edges from lower-to higher-level nodes,such as lagging birds’howl in a flock or the opinions of lowerlevel individuals feeding back to higher-level ones in a social *** study reveals that,for most large-scale real hierarchical networks,the majority of the reverse edges do not affect the synchronization process of the entire network;the synchronization process is influenced only by a small part of these reverse edges along specific *** surprisingly,a single effective reverse edge can slow down the synchronization of a huge hierarchical network by over 60%.The effect of such edges depends not on the network size but only on the average in-degree of the involved *** overwhelming majority of active reverse edges turn out to have some kind of“bunching”effect on the information flows of hierarchical networks,which slows down synchronization *** finding refines the current understanding of the role of reverse edges in many natural,social,and engineering hierarchical networks,which might be beneficial for precisely tuning the synchronization rhythms of these *** study also proposes an effective way to attack a hierarchical network by adding a malicious reverse edge to it and provides some guidance for protecting a network by screening out the specific small proportion of vulnerable nodes.

关键词： Synchronizability Large hierarchical networks Reverse edges Information flows Complex networks

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基于动态布局的块级网络存储系统VISA

计算机研究与发展 2007年第Z1期44卷 96-102页

作者：冯丹叶俊陈俭喜华中科技大学计算机科学与技术学院武汉430074 华中科技大学计算机科学与技术学院武汉430074 华中科技大学计算机科学与技术学院武汉430074

高性能、可扩展的网络存储系统在当今数据密集型应用中日益重要.分布式RAID作为一种存储体系结构,被广泛应用在集群和分布式计算环境中,但其机械的数据放置策略会导致在数据一致性维护中读写性能的下降.基于分布式RAID和存储虚拟化的理... 详细信息

高性能、可扩展的网络存储系统在当今数据密集型应用中日益重要.分布式RAID作为一种存储体系结构,被广泛应用在集群和分布式计算环境中,但其机械的数据放置策略会导致在数据一致性维护中读写性能的下降.基于分布式RAID和存储虚拟化的理念,提出了一种新型块级网络存储系统VISA(virtual interface storage architecture).VISA系统不仅可以实现本地和远程的快速存储访问,而且可以根据当前各存储节点的负载状况和数据布局策略,将用户I/O请求的逻辑块地址动态映射到物理块地址,从而达到负载均衡与高性能的统一.测试结果显示,使用这种动态映射策略的VISA系统与传统的采用分布式RAID结构的IP-SAN相比,顺序写性能提高了78.66%～141.77%,顺序读性能提高了34.89%～51.73%.

关键词： VISA 存储虚拟化动态地址映射块级存储网络存储

Silicon quantum dots-based fluorescent sensor for the detection of cobalt with high sensitivity and selectivity

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Chinese Chemical Letters 2024年第1期35卷 451-455页

作者： Ebtihaj Mohammed Sullam Khalid Mohammed Adam Juanjuan Liu Hongli chen jianxi Xiao State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China Department of Chemistry Faculty of EducationUniversity of KordofanEl Obeid 51111Sudan

Fluorescent silicon quantum dots(Si QDs)were hydrothermally synthesized from a mixture of 3(2-aminoethylamino)propyl(dimethoxymethylsilane)(AEAPDMMS)and poly(vinylpyrrolidine)(PVP).The resulting Si QDs exhibited good water solubility and high *** the optimized conditions,the probe revealed an excellent linear fluorescence quenching effect on Co2+ranging from 1μmol/L to 120μmol/L with a limit of detection of 0.37μmol/L(based on 3 s/k).The quenching mechanism was studied,showing that static quenching(SQE)causes the main ***,the test paper based on Si QDs was prepared,which is cost-effective,high sensitivity,good selectivity,easy to use and show excellent anti-interference *** method was applied to analyze the content of Co2+in environmental water samples with satisfying results.

关键词： Silicon quantum dots Fluorescence Poly(vinylpyrrolidine) Test paper Cobalt detection

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基于虚拟接口的存储网络适配器的设计与研究

华中科技大学学报（自然科学版） 2005年第Z1期33卷 146-149页

作者：陈俭喜路宏涛冯丹华中科技大学计算机科学与技术学院湖北武汉430074

提出了一种采用软硬件协同工作,使用以太网作为数据传输媒介的方法构建通用的存储网络适配器,并通过SOC的方式在网络适配器端实现用户级轻量级通信协议VIA.这种存储网络适配器最大限度地降低了通信主机的协议处理开销,减少了数据在通信... 详细信息

提出了一种采用软硬件协同工作,使用以太网作为数据传输媒介的方法构建通用的存储网络适配器,并通过SOC的方式在网络适配器端实现用户级轻量级通信协议VIA.这种存储网络适配器最大限度地降低了通信主机的协议处理开销,减少了数据在通信过程中的拷贝,既保证了与现有网络的兼容,又提高了网络存储性能.模拟测试结果显示这种新型存储网络适配器与普通网络适配器相比能将传输延迟缩短15%～20%.

关键词：虚拟接口网络适配器存储网络通信传输

Efficient water disinfection with ball milled Mg-biochar: The key role of trace Cu

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Chinese Chemical Letters 2024年第1期35卷 412-417页

作者： Yanchao Jin Suixiaochen chen Peiwen Huang Xiongjian chen Chun-Yan Lin Li-Ping Li Xiao chen Rui Ding jianxi Liu Riyao chen College of Environmental and Resource Sciences Fujian Normal UniversityFuzhou 350117China School of Materials and Chemical Engineering Minjiang UniversityFuzhou 350108China Research and Development Center for Watershed Environmental Eco-Engineering Beijing Normal UniversityZhuhai 519087China Fujian Key Laboratory of Pollution Control&Resource Reuse Fuzhou 350007China

In this study, magnesium and coconut shell carbon (CSC) were prepared by a ball milled process and used for water disinfection with adsorbing tiny amounts of copper(II). Dissolved oxygen (DO) was reduced to hydrogen peroxide (H_(2)O_(2)) via a two-electron pathway by Mg corrosion. Cu(II) in the wastewater will be enriched on the CSC surface and efficiently catalyzes H2O2 for inactivating E. coli. The results show that E. coli with an initial concentration of approximately 106 CFU/mL was under the detection limit (<4 CFU/mL) within 15 min. All of the Cu(II) could be adsorbed by the composite and catalyzed H2O2 to different active species. The quenching experiments, electron spin resonance (ESR) capture measurements and the UV-vis spectroscopy detection confirmed the present of the hydroxyl radicals (·OH), superoxide radicals (·O_(2)^(-)) and Cu(III). Different with tradition Fenton like process, Cu(III), rather than radicals, played the major role during the Mg-CSC/Cu(II) process. In addition to the cellular membrane damage, most of the bacterial genomic DNA was also be degraded and the bacterial reactivation was avoided. The Mg-CSC/Cu(II) process also showed a satisfied disinfection performance in real wastewater treatment. Overall, this study provides a new strategy for water disinfection.

关键词： Disinfection Magnesium Cu Hydrogen peroxide Biochar

Profile of Dr. Songlin chen

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Science China Life Sciences 2024年第10期67卷 2062-2063页

作者： chen, Songlin Yellow Sea Fisheries Res Inst Qingdao Peoples R China

For decades, Dr. chen has been engaged in fish germplasm preservation, sex control and research focusing on molecular breeding for disease resistance. He discovered the first sex-specific molecular marker of fish(chen et al., 2007),deciphered the first fish genome(Chinese tongue sole) in China, revealed the sex determination mechanism in fish(chen et al., 2014), and created molecular sex control technology. He also discovered the molecular mechanism of metamorphosis in flatfish(Shao et al., 2017) and developed China's first fish disease-resistant breeding gene chip, “YUXIN No.1”.

关键词： TURBOT SCOPHTHALMUS-MAXIMUS GENOMIC SELECTION JAPANESE FLOUNDER SEX-CHROMOSOME CELL-LINE CRYOPRESERVATION EVOLUTION EMBRYOS