Raw Gangue Filling Mining under Construction —A Case Study in China

In order to recover the strip pillar coal resources, reduce the amount of gangue mountain and realize remediation of the goaf environment in the old mining area, the raw gangue filling mining technology was proposed. According to the previous practical experience, the feasibility of the implementation of raw gangue filling mining technology in the coal-pressed area was analyzed. Through the filling gangue compaction test, the deformation under different loading stages was obtained. Further, a reasonable prediction of the deformation beyond the experimental limited loading load was made based on the experimental results. Through the deformation source analysis of the whole process of gangue filling, the key factors for controlling deformation before, during, and after filling were determined. Additionally, the proportion of deformation during different stages was quantified. Considering the protection of surface buildings, mining fullness of the working face and mining technology, the production parameters of 1209 and 1210 filling working faces were preliminarily determined. Through numerical simulation, the rationality of mining scheme was verified. Based on the practice of 1209 working face and the key factors to control the deformation of gangue filling, the mining system and process in 1210 working face were optimized. According to the measured surface rock movement, raw gangue filling mining technology can meet the requirements of surface building protection level. Especially, this paper provides a method to quantitatively calculate the equivalent mining height (EMH) of raw gangue filling and its mining deformation, which has reference significance for old mining areas.

Research on Distribution Regularities of Dust Concentration and Granularity in Large Mining Height Working Face

The key for dust control of coal mine is to clarify the dust concentration distribution and sedimentation in different areas. Both similarity experiment and numerical simulation method have certain restrictions and are quite different from the actual situation on site. In order to study the dust sedimentation regularity of coal mine in large mining height, “filter membrane method” is adopted in this paper, i.e., to dry and weigh the filter membrane before and after sampling, collect the dust of respirable zone on mining face and calculate the dust concentration based on a main airway of 100 m. The result shows that: A large amount of dust will be produced during coal mining, wherein the maximum dust concentration from 6 m upstream to 100 m downstream of coal cutter is 121 mg/m3, while the minimum dust concentration is 61 mg/m3;The dust concentration in return airway is reduced with the distance increases, while the dust concentration at the entrance is 91 mg/m3;A large amount of dust may fall from roof during section advancing and improves the dust concentration of hydraulic support in walking area obviously;The dust granularity of mining face and return airway is 0 - 100 μm, but the amount of respirable dust is higher than 80%, the larger the dust particle size, the higher the dust concentration. Besides, dust in small particle size can be suspended in air flow for longer, but that in large particle size may subside under the action of gravity;To reduce dust exposure, the mining position shall be located in the windward direction of advancing or coal cutter. This research can provide guidance for taking dust prevention measures of working face in large mining height.

大数据与人工智能时代下复杂系统管理研究的若干关键科学问题

当前,世界正在进入大数据与人工智能时代,复杂系统已呈现出人—机—网跨尺度耦合与互融互通的新形态。新形态下的复杂系统管理,既要对传统管理理论和方法进行突破创新,更要充分借助先进的技术手段对其进行赋能。本文面向大数据和人工智能时代下复杂系统管理的国家重大需求,阐述了当前复杂系统管理研究存在的重大机遇与挑战,分析了当前复杂系统管理研究的研究现状并指出了未来的发展趋势,在此基础上,进一步凝练了未来5~10年该领域的发展目标、拟开展的重大关键科学问题及其资助重点。

Evacuation based on spatio-temporal resilience with variable traffic demand

The efficient evacuation of people from dangerous areas is a key objective of emergency management.However,many emergencies give little to no advanced warning,leading to spontaneous evacuation with no time for planning or management.For large emergencies,destinations become less certain,with traffic demand imbalanced and concentrated on a few oversaturated routes familiar to evacuees.Ultimately,this leads to rapid congestion and delay on some routes,while others remain barely used,extending clearance times with an accumulating population at risk.In this study we address these issues through incorporating spatio-temporal traffic resilience dynamics into a destination choice model utilizing the available capacity of the overall network.We validate our model through a post-concert egress event.The results suggest that our method can reduce total egress times and average travel time by 20%-43%over the no-guidance condition.Our method can be used to estimate and quantify emergency conditions to optimally guide destinations and routing choice for evacuees and/or autonomously moving vehicles during evacuations.

Special issue:Reliability management of complex system

Nowadays,reliability is moving toward interdisciplinary research with ever-increasing connotations for full life-cycle system management,including system design,analysis,modeling,test,operation,optimization,etc.Meanwhile,complex systems,such as transportation system,power system,communication system and other various critical infrastructure systems,have posed a big challenge,which attracts great attention both in theory and application.Characterized by nonlin ear interaction,emerge nt response,and high dime nsional coupling,the complex systems are in the face of extremely high uncertainty and vulnerability.

系统评价类综述与普通综述:标准及复杂性探究

本文是由Robert T.Sataloff,Ehab Y.Hanna,李大庆教授等20余位耳鼻咽喉头颈外科领域知名期刊主编共同撰写的一篇针对系统评价等不同类型综述文章标准及复杂性分析的述评类文章。该文章将于2021年7月在包括《世界耳鼻咽喉头颈外科杂志(英文)》,Journal of Voice,Head&Neck,American Journal of Rhinology&Allergy,The Laryngoscope等20余本国际知名耳鼻咽喉头颈外科期刊同时以英文版本刊出,为了便于中国读者对该内容进行深入了解,在获得相应授权后,本刊特别邀请刘争教授团队对该文章进行翻译,同期在本刊以中文版本刊登。希望本文对广大读者在撰写综述类文章时有所裨益。

最大非毒性剂量汉防己甲素对人鼻咽癌细胞放疗增敏作用的研究

目的 探讨最大非毒性剂量汉防己甲素（tetrandrine,Tet）对人鼻咽癌细胞株CNE1和CNE2的放射增敏作用.方法 采用单纯放射线照射和Tet联合放射线照射对CNE1和CNE2细胞株进行处理,中性彗星电泳检测不同方式处理组中CNE1和CNE2细胞DNA损伤,流式细胞仪检测细胞周期和细胞凋亡率.结果 单纯放射线照射组CNE1和CNE2细胞平均彗星尾矩（tail moment,TM）分别为（7.13±3.70）（x±s）、（11.52±4.04）,Tet联合放射线照射组平均TM分别为（13.61 ±5.45）、（18.85±6.18）,差异有统计学意义（t值分别为2.784和3.089,P值均＜0.05）.单纯放射线照射组CNE1和CNE2细胞周期以G2期为主,分别为（42.62±2.07）％、（34.82±2.74）％,Tet联合放射线照射组分别为（17.02±1.87）％、（19.64±4.82）％,差异有统计学意义（t值分别为23.173和16.500,P值均＜0.01）.单纯放射线照射组CNE1和CNE2细胞凋亡率分别为（17.24％±0.99）％、（16.68％±0.27）％,Tet联合放射线照射组分别为（19.11±1.24）％、（18.51±2.41）％,差异无统计学意义（P值均＞0.05）.结论 最大非毒性剂量Tet能增加人鼻咽癌细胞株CNE1和CNE2的放射敏感性,其机制可能与去除放射线照射诱导的G2/M期阻滞,降低细胞修复DNA双链断裂能力有关.

Percolation transition in temporal airport network

The air transportation system has a critical impact on the global economy.While the system reliability is essential for the operational management of air traffic,it remains challenging to understand the network reliability of the air transportation system.This paper focuses on how the global air traffic is integrated from local scale along with operational time.The integration process of air traffic into a temporally connected network is viewed as percolation process by increasing the integration time constantly.The critical integration time TPwhich is found during the integration process can measure the global reliability of air traffic.The critical links at TPare also identified,the delay of which will influence the global integration of the airport network.These findings may provide insights on the reliability management for the temporal airport network.

Percolation-based health management of complex traffic systems

System health management,which aims to ensure the safe and efficient operation of systems by reducing uncertain risks and cascading failures during their lifetime,is proposed for complex transportation systems and other critical infrastructures,especially under the background of the New Infrastructure Projects launched in China.Previous studies proposed numerous approaches to evaluate or improve traffic reliability or efficiency.Nevertheless,most existing studies neglected the core failure mechanism(i.e.,spatio-temporal propagation of traffic congestion).In this article,we review existing studies on traffic reliability management and propose a health management framework covering the entire traffic congestion lifetime,from emergence,evolution to dissipation,based on the study of core failure modes with percolation theory.Aiming to be"reliable,invulnerable,resilient,potential,and active",our proposed traffic health management framework includes modeling,evaluation,diagnosis,and improvement.Our proposed framework may shed light on traffic management for megacities and urban agglomerations around the world.This new approach may offer innovative insights for systems science and engineering in fiiture intelligent infrastructure management.

Systematic and other reviews: Criteria and complexities

Review articles can be extremely valuable.They synthesize information for readers,often provide clarity and valuable insights into a topic;and good review articles tend to be cited frequently.Review articles do not require Institutional Review Board(IRB)approval if the data reviewed are public(including private and government databases)and if the articles reviewed have received IRB approval previously.

An undertaking of legacy and innovation

After two years in development, The World Journal of Otorhinolaryngology Head & Neck Surgery has finally been established.This journal aims to provide a platform for professional and scientific discussion in the field of Otorhinolaryngology: Head and Neck Surgery and related specialties viewed through the lens of a changing world.In this era of global communication, the Journal aims to actively promote academic exchange and enhance collaboration between clinicians, allied health specialists, and researchers.