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Mechanics and safety issues in tailing-based backfill:A review

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1165-1178页

作者： Xu zhao Andy Fourie Chong-chong qi School of Civil Environmental and Mining EngineeringUniversity of Western AustraliaPerth 6009Australia School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Voids(referred to as "stopes") are generally created during underground mining activities and can lead to both local and regional geotechnical instabilities. To assist in managing the stability of mining-related voids and improving the recovery of orebodies, tailing-based backfill technology has been widely used around the world. In the design of tailing-based backfill strategy, the specific function and engineering requirements of the filling are intimately dependent on the stress distribution within the backfilled stope. In this paper, the main mechanics involved in tailing-based backfill in underground mines, which include arching, consolidation, hydration process, and movement of surrounding rocks, are reviewed. Research on the safety of a barricade and stability of an exposed fill face are also presented. In conclusion, the backfilling process should be performed on the basis of a better understanding of the complicated interactions of the mechanisms of filling, consolidation, and hydration process(when cement is added).

关键词： tailing-based backfill arching consolidation barricade safety

Axisymmetric compressive buckling of multi-walled carbon nanotubes under different boundary conditions

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Acta Mechanica Sinica 2012年第1期28卷 83-90页

作者： Cheng-qi Sun kai-Xin Liu You-Shi Hong The State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences100190 BeijingChina LTCS and Department of Mechanics&Aerospace Engineering College of EngineeringPeking University100871 BeijingChina

The paper studies the axisymmetric compressive buckling behavior of multi-walled carbon nanotubes （MWNTs） under different boundary conditions based on continuum mechanics model. A buckling condition is derived for determining the critical buckling load and associated buckling mode of MWNTs, and numerical results are worked out for MWNTs with different aspect ratios under fixed and simply supported boundary conditions. It is shown that the critical buckling load of MWNTs is insensitive to boundary conditions, except for nanotubes with smaller radii and very small aspect ratio. The associated buckling modes for different layers of MWNTs are in-phase, and the buckling displacement ratios for different layers are independent of the boundary conditions and the length of MWNTs. Moreover, for simply supported boundary conditions, the critical buckling load is compared with the corresponding one for axial compressive buckling, which indicates that the critical buckling load for axial compressive buckling can be well approximated by the corresponding one for axisymmetric compressive buckling. In particular, for axial compressive buckling of double-walled carbon nanotubes, an analytical expression is given for approximating the critical bucklingload. The present investigation may be of some help in fur- ther understanding the mechanical properties of MWNTs.

关键词： Carbon nanotube Buckling van der Waals forces

Radio Access Network Slicing Based on C/U Plane Separation

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China Communications 2017年第12期14卷 134-141页

作者： Hui zhao Liqiang zhao kai Liang Chengkang Pan State Key Laboratory of Integrated Service Networks Xidian University Xi'an 710071 Shaanxi Province China China Mobile Research Institute Beijing 100053 China

Network slicing achieves many interests from industry and academics due to its flexibility and *** this paper,we present a novel slicing scheme for radio access networks(RANs) based on control/user(C/U) plane ***,we divide e NBs into two sub-e NBs called Ce NB and Ue NB,for transmitting control data and user data respectively,thereby facilitating C/U plane ***,upon Ce NBs and Ue NBs being virtualized,we develop two RAN slices for control and user plane *** results show the feasibility of the proposed scheme.

关键词： C/U plane separation RAN slic-ing virtualization air interface

Study on three independent parameters of focal mechanism solution

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Earthquake Science 2017年第1期30卷 57-66页

作者： qi Li kai Tan Key Laboratory of Earthquake Geodetic Surveying Earthquake Research InstituteChina Earthquake Administration

In this paper, the relationships of the plunges and azimuths of T and P axes versus the strikes, dips, and rakes of two seismic nodal planes were derived to provide ref- erence for earthquake researchers. The independence of the plunges and azimuths of T, B, and P axes in focal mech- anism solution was discussed, and it was concluded that three parameters, i.e., the azimuths of T, B and P axes, are completely independent. The focal mechanism solution representation based on Euler rotation was introduced, using three Euler angles in place of the plunges and azi- muths of T, B, and P axes, and three focal mechanism solution representations were briefly compared and ana- lyzed in respect of accuracy on the basis of the assumption of rounding; it was concluded that the Euler angle repre- sentation has better accuracy, compared with the azimuth representation and the traditional representation with T, B, and P axes.

关键词： Focal mechanism solution Independence Euler angels

New Neuraminidase Inhibitory Alkaloids from the Mangrove Soil-Derived Fungus Arthrinium *** 41305

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Journal of Ocean University of China 2023年第5期22卷 1446-1451页

作者： HU Yiwei zhao kai ZHU Junheng qi Xin CHEN Weihao SONG Yingying PANG Xiaoyan LIU Yonghong WANG Junfeng CAS Key Laboratory of Tropical Marine Bio-Resources and Ecology Guangdong Key Laboratory of Marine Materia MedicaInnovation Academy of South China Sea Ecology and Environmental EngineeringSouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China University of Chinese Academy of Sciences Beijing 100049China

New alkaloid,(E)-2-(hydroxyimino)-4-methylpentanamide(1)and a new cyclopentano[b]pyridine,4-hydroxy-7-methyl-6,7-dihydro-5H-cyclopenta[c]pyridin-5-one(2),together with ten known compounds(3–12)were isolated from the mangrove soil-derived fungus Arthrinium *** *** spectroscopic analysis and X-Ray crystallographic analysis were used to elucidate the structure of(E)-2-(hydroxyimino)-4-methylpentanamide(1),including its absolute *** the isolated compounds(1–12)were evaluated for their antimicrobial and enzyme inhibitory activities against acetylcholinesterase(ACh E),neuraminidase(NAs),and phosphatidylinositol 3-kinase(PI3K).Among them,compounds 1 and 3 exhibited strong neuraminidase inhibitory activity with IC_(50)values of 12.04,1.92μmol L^(-1)(IC_(50)20μmol L^(-1)for oseltamivir acid),while compounds 5,6,8,and 10showed moderate neuraminidase inhibitory activity,and compounds 6–10 displayed weak enzyme inhibitory activities against PI3K.

关键词： Arthrinium alkaloid pyridine neuraminidase acetylcholinesterase

Analyzing the capability of a radio telescope in a bistatic space debris observation system

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Research in Astronomy and Astrophysics 2013年第12期13卷 1518-1526页

作者： Zhe zhao You zhao Peng-qi Gao National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

A bistatic space debris observation system using a radio telescope as the receiving part is introduced. The detection capability of the system at different working frequencies is analyzed based on real instruments. The detection range of targets with a fixed radar cross section and the detection ability of small space debris at a fixed range are discussed. The simulations of this particular observation system at different transmitting powers are also implemented and the detection capability is discussed. The simulated results approximately match the actual experiments. The analysis in this paper provides a theoretical basis for developing a space debris observation system that can be built in China.

关键词： instrumentation: detectors - large radio telescope techniques: radarastronomy

Influence of gut bacteria on type 2 diabetes:Mechanisms and therapeutic strategy

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World Journal of Diabetes 2025年第1期16卷 27-33页

作者： Xue Wen Lu-Ming qi Kui zhao College of Health and Rehabilitation Chengdu University of Traditional Chinese MedicineChengdu 610000Sichuan ProvinceChina College of Materials and Chemical Engineering Southwest Forestry UniversityKunming 650224Yunnan ProvinceChina

The onset and progression of type 2 diabetes mellitus(T2DM)are strongly associated with imbalances in gut bacteria,making the gut microbiome a new potential therapeutic *** commentary examines the recent publication in World Journal of *** article explores the association between T2DM and gut microbiota,with a focus on the pathophysiological changes related to *** proposes innovative microbiome-targeted therapeutic strategies and evaluates the challenges and future directions of such *** editorial summarizes the key points of their discussion of the role of the gut microbiome in T2DM and elaborates on the influence of specific gut microbial species on the disease through the host–microbiota metabolic *** provides new insights for future research on gut-microbiota-based interventions for T2DM.

关键词： Type 2 diabetes Intestinal microbiome Intestinal axis Biological pathways Treatment Short-chain fatty acids

Construction of bimetallic Pt-Pd/CeO_(2)-ZrO_(2)-La_(2)O_(3) catalysts with different Pt/Pd ratios and its structure-activity correlations for three-way catalytic performance

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Journal of Rare Earths 2023年第6期41卷 896-904,I0004页

作者： kai Chen Jie Wan Ting Wang qi Sun Renxian Zhou Institute of Catalysis Zhejiang UniversityHangzhou 310028China Energy Research Institute Nanjing Institute of TechnologyNanjing 211167China School of Environmental Engineering Nanjing Institute of TechnologyNanjing 211167China

A series of Pt-Pd bimetallic catalysts supported on CeO_(2)-ZrO_(2)-La_(2)O_(3) mixed oxides were synthesized through the conventional impregnation ***-way catalytic performance evaluations along with detailed physio-chemical characterizations were carried out to establish possible structure-activity *** show that on the one hand,different Pt/Pd ratios can strongly affect the TWC behaviors of Pt-Pd/CZL catalysts by modulating the synergistic effect between Pt and *** the other hand,higher Pt/Pd ratio also favors better dispersion of precious *** improved precious metals(PM)dispersion can promote the metal-support interaction and increase the surface oxygen vacancies concentration,thereby raising the dynamic oxygen storage/release capacity,improving the redox ability as well as enha ncing the thermal stability of the Pt-Pd/CZL ***,the stro ng metal-support interaction can augment surface oxygen vacancy concentration,thereby benefiting low temperature CO and NO reaction via augmented NOxadsorption and nitrate conversion.

关键词： Three-way catalyst Bimetallic Metal-support interaction Dispersion Dynamic oxygen storage/release capacity Rare earths

LncPipe＂ A Nextflow-based pipeline for identification and analysis of long non-coding RNAs from RNA-Seq data

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Journal of Genetics and Genomics 2018年第7期45卷 399-401页

作者： qi zhao Yu Sun Dawei Wang Hongwan Zhang kai Yu Jian Zheng Zhixiang Zuo State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer MedicineSun Yat-sen University Cancer CenterGuangdong 510060China School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510060China Department of Thoracic Surgery China Meitan General HospitalBeijing 100028China

Long noncoding RNAs （IncRNAs） have been increasingly implicated in a variety of human diseases, including autoimmune disease （Wu et al., 2015）, neurodegenerative diseases （Wapinski and Chang, 2011） and cancer （Huarte, 2015）. Due to recent advances in next-generation sequencing technologies, tens of thousands of lncRNAs have been identified and annotated, a number of them have been proven to be functional in diverse biological processes through various mechanisms.

关键词： LncPipe" A Nextflow-based pipeline identification analysis of long non-coding RNAs RNA-Seq data