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In-building coverage of millimeter-wave wireless networks from channel measurement and modeling perspectives

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Science China(Information Sciences) 2020年第8期63卷 5-20页

作者： peize zhang Cheng YI Bensheng YANG Cheng-Xiang WANG Haiming WANG Xiaohu YOU State Key Laboratory of Millimeter Waves Southeast University National Mobile Communications Research Laboratory Southeast University

To progress cost-effective deployment of millimeter-wave(mm Wave) wireless networks for indoor users, the prediction of indoor-to-indoor(I2I) and outdoor-to-indoor(O2I) coverage based on field measurement studies is of great interest to the future generation mobile communication system. First, measurements in I2I and O2I scenarios, which have advantages in terms of achieving a fair comparison of channel characteristics across different mm Wave bands and bandwidths, are performed. Next, the developed dual-slope path loss model with a break-point distance is found to well fit omnidirectional and directional measured I2I data, especially at 39.5 GHz, revealing that the transition from lit or shadow regions to totally blocked regions is abrupt. Combined with space-time propagation characteristics, the indoor blockage effect on path loss and angular spread is investigated, therein being essential for the design of beam-steering and tracking algorithms. Double-directional measurement results show that most dominant paths arrive along the line-ofsight path, and only a few in-building reflections can be detected in higher frequency bands. Based on the joint analysis of channel measurement and modeling results, several mm Wave network design and in-building coverage enhancement insights are presented.

关键词： building entry loss channel modeling in-building coverage millimeter-wave communication propagation measurements

Microscopic defects formation and dynamic mechanical response analysis of Q345 steel plate subjected to explosive load

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Defence Technology（防务技术） 2024年第2期32卷 430-442页

作者： Zhengqing Zhou Zechen Du Yulong zhang Guili Yang Ruixiang Wang Yuzhe Liu peize zhang Yaxin zhang Xiao Wang Research Institute of Macro-Safety Science University of Science and TechnologyBeijing100083China School of Civil and Resource Engineering University of Science and TechnologyBeijing100083China China North Industry Advanced Technology Generalization Institute Beijing100089China College of Field Engineering PLA Army Engineering UniversityNanjing210007China School of Mechanical Engineering Nantong UniversityNantong226019China

As the basic protective element, steel plate had attracted world-wide attention because of frequent threats of explosive loads. This paper reports the relationships between microscopic defects of Q345 steel plate under the explosive load and its macroscopic dynamics simulation. Firstly, the defect characteristics of the steel plate were investigated by stereoscopic microscope(SM) and scanning electron microscope(SEM). At the macroscopic level, the defect was the formation of cave which was concentrated in the range of 0-3.0 cm from the explosion center, while at the microscopic level, the cavity and void formation were the typical damage characteristics. It also explains that the difference in defect morphology at different positions was the combining results of high temperature and high pressure. Secondly, the variation rules of mechanical properties of steel plate under explosive load were studied. The Arbitrary Lagrange-Euler(ALE) algorithm and multi-material fluid-structure coupling method were used to simulate the explosion process of steel plate. The accuracy of the method was verified by comparing the deformation of the simulation results with the experimental results, the pressure and stress at different positions on the surface of the steel plate were obtained. The simulation results indicated that the critical pressure causing the plate defects may be approximately 2.01 GPa. On this basis, it was found that the variation rules of surface pressure and microscopic defect area of the Q345 steel plate were strikingly similar, and the corresponding mathematical relationship between them was established. Compared with Monomolecular growth fitting models(MGFM) and Logistic fitting models(LFM), the relationship can be better expressed by cubic polynomial fitting model(CPFM). This paper illustrated that the explosive defect characteristics of metal plate at the microscopic level can be explored by analyzing its macroscopic dynamic mechanical response.

关键词： Explosive load Q345 steel Micro defect Finite element simulation Dynamic response Data fitting

Radio propagationmeasurement and cluster-based analysis formillimeter-wave cellular systems in dense urban environments

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Frontiers of Information Technology & Electronic Engineering 2021年第4期22卷 471-487页

作者： peize zhang Haiming WANG Wei HONG State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China

The deployment of millimeter-wave(mmWave)cellular systems in dense urban environments with an acceptable coverage and cost-efficient transmission scheme is essential for the rollout of fifth-generation and beyond *** this paper,cluster-based analysis of mmWave channel characteristics in two typical dense urban environments is ***,radio propagation measurement campaigns are conducted in two identified mmWave bands of 28 and 39 GHz in a central business district and a dense residential *** customdesigned channel sounder supports high-efficiency directional scanning sounding,which helps collect sufficient data for statistical channel ***,using an improved auto-clustering algorithm,multipath clusters and their scattering sources are *** appropriate measure for inter-and intra-cluster characteristics is provided,which includes the cluster number,the Ricean K-factor,root-mean-squared(RMS)delay spread,RMS angular spread,and their *** of these parameters across two mmWave bands for both line-of-sight(LoS)and non-light-of-sight(NLoS)links are *** shed light on the blockage effects,detailed analysis of the propagation mechanisms corresponding to each NLoS cluster is provided,including reflection from exterior walls and diffraction over building corners and ***,the results show that the cluster-based analysis takes full advantage of mmWave beamspace channel characteristics and has further implications for the design and deployment of mmWave wireless networks.

关键词： Millimeter-wave communication Clustering Diffraction Multipath channels Propagation measurement

Severe radiological manifestation in patients with diabetes and pulmonary tuberculosis:A cross-sectional study

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Severe radiological manifestation in patients with diabetes ...

世界卫生组织《耐药结核病和丙型病毒性肝炎治疗的联合管理(2024快讯版)》解读

中国防痨协会第33届全国学术大会暨中国防痨科技奖颁奖大会

作者： peize zhang Juan Xiong Shenlin Zhan Tantan Ren Yuxiang Wang Liang Fu Guofang Deng Department of Pulmonary Medicine & Tuberculosis The Third People's Hospital of Shenzhen School of Public Health Health Science CenterShenzhen University

Purpose Diabetes mellitus(DM) is believed to affect tuberculosis(TB) at multiple levels in disease control and treatment efficacy,but clinical and radiological presentation resulting from interaction of the two diseases is not *** conducted a retrospective study to investigate how glycemic control impacts radiological and clinical manifestations in TB *** A cross-sectional study was conducted on data obtained from medical records of 438 patients confirmed with TB-DM comorbidity at The Third people’s hospital of Shenzhen from April 1,2014 to April 30,*** CT images were reviewed,and patients were divided into subgroups according to lung cavitation:with and without cavities,and number of segments showing pulmonary infiltration:8 segment *** then compared clinical parameters between these *** The median age of the patients was 50.0 years(IQR 43.3-56) and 86%(n=375) of them were *** cavities were found in 80.8% patients.42.7% and 27.2% patients were seen to have infiltration involving 4-8 and>8 lung segments *** presented with cavitation and infiltration involving a greater number of lung segments had significantly higher values of WBC,MONO%,GRA%,CRP,lower LYN% level and higher bacterial burden in sputum(P0.9 and P=0.1 respectively).Lower HGB,ALB and higher PCT were observed in patients with infiltration involving more lung ***:Hyper-inflammation in peripheral blood was significantly associated with cavity and the number of lung *** was significantly associated with the development of lung *** control and inflammation influenced radiographic manifestations in patients with TB-DM.

关键词： Diabetes mellitus HbA1C Tuberculosis Lung cavity Radiography lung infiltration Chest CT

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中国防痨杂志 2024年第8期46卷 874-876页

作者：杨梁梓张培泽卢水华深圳市第三人民医院/南方科技大学第二附属医院/国家感染性疾病临床医学研究中心深圳518112

世界卫生组织于2024年4月9日发布了《耐药结核病和丙型肝炎治疗的联合管理(2024快讯版)》。本文中,笔者介绍了该指南内容的要点,包括耐药结核病与丙型病毒性肝炎共病治疗管理的背景、指南更新的主要关键证据及主要发现,并总结下一步指... 详细信息

世界卫生组织于2024年4月9日发布了《耐药结核病和丙型肝炎治疗的联合管理(2024快讯版)》。本文中,笔者介绍了该指南内容的要点,包括耐药结核病与丙型病毒性肝炎共病治疗管理的背景、指南更新的主要关键证据及主要发现,并总结下一步指南更新方向,同时,就该指南在中国临床实践的可行性和未来研究方向提出了思考和讨论。

关键词：结核,肺抗药性,细菌肝炎,丙型共病现象疾病管理

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极板材料对三维电极反应器处理苯酚模拟废水的影响

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环境科学学报 2009年第10期29卷 2076-2080页

作者：班福忱刘炯天程琳张佩泽东北大学资源与土木工程学院沈阳110004 沈阳建筑大学市政与环境工程学院沈阳110168

采用铁板、石墨、钛涂钌铱3种阳极材料和多孔石墨、活性炭纤维、不锈钢3种阴极材料对三维电极反应器处理苯酚模拟废水进行研究,并分析了不同极板材料对H2O2产量及对苯酚去除率的影响.结果表明,不同的阴阳极材料体系中,H2O2产量和苯酚的... 详细信息

采用铁板、石墨、钛涂钌铱3种阳极材料和多孔石墨、活性炭纤维、不锈钢3种阴极材料对三维电极反应器处理苯酚模拟废水进行研究,并分析了不同极板材料对H2O2产量及对苯酚去除率的影响.结果表明,不同的阴阳极材料体系中,H2O2产量和苯酚的去除率有较大差异,钛涂钌铱电极更适合作为反应体系的阳极,铁板作为阳极存在着在电解过程中产生大量铁泥污染以及损耗严重等缺点.多孔石墨、活性炭纤维、不锈钢3种阴极材料中,活性炭纤维显示出了良好的矿化能力.当采用钛涂钌铱极板作为阳极,活性炭纤维作阴极,此时苯酚的最大去除率可达到92.1%.

关键词：三维电极反应器苯酚电极材料 H2O2 去除率

含苯酚废水三维电极-Fenton试剂法的氧化技术

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沈阳建筑大学学报（自然科学版） 2009年第2期25卷 329-332页

作者：班福忱刘炯天程琳张佩泽东北大学资源与土木工程学院辽宁沈阳110004 沈阳建筑大学市政与环境工程学院辽宁沈阳110168

目的为了寻求一种经济且有效的苯酚废水的处理方法,探讨苯酚废水在该法中的降解规律和机理,为该法应用于实际苯酚废水处理提供理论依据.方法试验根据电解原理,采用自制三维电极-Fenton试剂法反应器对苯酚废水进行处理.结果三维电极-Fen... 详细信息

目的为了寻求一种经济且有效的苯酚废水的处理方法,探讨苯酚废水在该法中的降解规律和机理,为该法应用于实际苯酚废水处理提供理论依据.方法试验根据电解原理,采用自制三维电极-Fenton试剂法反应器对苯酚废水进行处理.结果三维电极-Fenton试剂法能够将电解产生的.OH和Fenton反应产生的.OH用于苯酚废水的降解,对苯酚废水具有较高的去除率,采用活性炭纤维作阴极,在最佳反应条件pH值为3.0,Fe2+投加量为0.8 mmol/L,电解电压为12 V时,苯酚的最大降解率为94.5%.结论三维电极-Fenton试剂法适用于处理浓度较高、且有毒性的废水,是个快捷、经济、高效的废水处理方法,同时对其他工业废水的处理具有借鉴意义.

关键词：三维电极 Fenton试剂催化氧化苯酚去除率

不同类型填料的三维电极／Fenton试剂法处理苯酚废水

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环境污染与防治 2009年第4期31卷 24-27页

作者：班福忱刘炯天程琳张佩泽东北大学资源与土木工程学院辽宁沈阳110004 沈阳建筑大学市政与环境工程学院辽宁沈阳110168

采用不同类型填料对三维电极/Fenton试剂法处理苯酚模拟废水进行研究。结果表明,不同类型活性炭填料对苯酚去除率有很大影响,粒炭不适合做粒子电极,采用5.0mm柱炭处理效果较好;采用石英砂与活性炭混合填料的处理效果比单一活性炭填料好... 详细信息

采用不同类型填料对三维电极/Fenton试剂法处理苯酚模拟废水进行研究。结果表明,不同类型活性炭填料对苯酚去除率有很大影响,粒炭不适合做粒子电极,采用5.0mm柱炭处理效果较好;采用石英砂与活性炭混合填料的处理效果比单一活性炭填料好,但苯酚去除率提高不明显;电解槽反应器中按比例投加涂膜活性炭和活性炭混合填料能明显提高苯酚去除率;当涂膜活性炭与活性炭体积比为1∶2时,苯酚去除率最高,达96.8%。

关键词：三维电极 Fenton试剂苯酚石英砂涂膜活性炭

程序性死亡-1抗体在感染性疾病中的应用研究

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中华结核和呼吸杂志 2018年第9期41卷 743-746页

作者：张培泽郑俊峰曹炜鹏邓国防深圳市第三人民医院肺二科 518000

近年来，美国食品药品监督管理局批准了2种程序性死亡-1（programmed death-1，PD-1）单克隆抗体用于治疗人类癌症^[1]。PD-1抗体通过阻断PD-1／PD-L1信号通路，减少免疫细胞凋亡，增强免疫细胞功能，在人类癌症的治疗中获得广泛的关注... 详细信息

近年来，美国食品药品监督管理局批准了2种程序性死亡-1（programmed death-1，PD-1）单克隆抗体用于治疗人类癌症^[1]。PD-1抗体通过阻断PD-1／PD-L1信号通路，减少免疫细胞凋亡，增强免疫细胞功能，在人类癌症的治疗中获得广泛的关注和认可，但其在感染性疾病中的作用目前仍未明确，现将PD-1抗体在感染性疾病方面的研究进展综述如下。

关键词：程序性死亡-1 感染性疾病抗体美国食品药品监督管理局 death-1 应用 PD-1 免疫细胞凋亡