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A causation mechanism for coal bursts during roadway development based on the major horizontal stress in coal:Very specific structural geology causing a localised loss of effective coal confinement and Newton’s second law

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International Journal of Mining Science and Technology 2020年第1期30卷 39-47页

作者： Russell Frith Guy Reed aaron Jones Mine Advice Pty Ltd BeresfieldNew South Wales 2322Australia

In 2017,one of the international authorities on coal bursts,Mark Christopher,published a paper entitled"Coal bursts that occur during development:A rock mechanics enigma",in which several relevant technical issues were *** paper outlines what is considered to be a credible,first-principles,mechanistic explanation for these three current development coal burst conundrums by reference to early published coal testing work examining the significance of a lack of"constraint"to coal stability and an understanding of how very specific structural geology and other geological features can logically cause this to occur in situ,albeit on a statistically very rare *** basic model is examined by reference to published information pertaining to the development coal-burst that occurred at the Austar Coal Mine in New South Wales,Australia,in 2014 and from the Sunnyside District in Utah,the United ***"cause and effect"model for development of coal bursts presented also offers a meaningful explanation for the statistical improbability for what are nonetheless potentially highly-destructive events,being able to explain the statistical rarity being just as important to the credibility of the model as explaining the local conditions associated with burst *** model could also form the basis for a robust,riskbased approach utilising a"hierarchy of controls",to the operational management of the development coal burst ***,the use of pre-mining predictions for likely burst-prone and non-burstprone areas,the use of the mine layout to avoid or at least minimise mining within burst-prone areas if appropriate,and finally the development of an operational Trigger Action Response Plan(TARP)that reduces the likelihood of inadvertent roadway development into a burst-prone area without suitable safety controls already being in place.

关键词： Development coal burst Wing-cracks Austar Mine Sunnyside Mine Major horizontal stress in coal

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A Grid-friendly Neighborhood Energy Trading Mechanism

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1349-1357页

作者： Anula Abeygunawardana aaron Liu Gerard Ledwich Queensl and University of Technology BrisbaneAustralia IEEE

More customers are tending to install batteries with photovoltaic(PV), so they can better control their electricity bills. In this context, customers may be tempted to go offgrid at a substantial up-front cost, leading electricity companies into a death spiral, thereby raising electricity price further on those remaining on grid. Neighborhood energy markets can promote the sharing of locally generated renewable energy and encourage prosumers to stay on grid with financial incentives. A novel neighborhood energy trading(NET) mechanism is developed using the topology of existing radial distribution network to encourage sustainable energy sharing in neighborhood and encourage prosumers to stay on grid. This mechanism considers loss, congestion management, and voltage regulation, and it is scalable with low computation and communication *** IEEE test system is used to validate the NET *** simulation shows that the price and flow results are obtained with fast computation speed(within 10 iterations) and with loss reflected, flow limit reinforced, and voltage *** study proves that the economic demand-supply-based pricing mechanism can be applied effectively in distribution networks to help encourage more renewable energy sharing in sustainable neighborhood and avoid energy network death spiral.

关键词： Direct power flow directional adjacency local energy market peer-to-peer prosumer solar community sustainable building transdisciplinary research

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Global optimal path planning for mobile robot based onimproved Dijkstra algorithm and ant system algorithm

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Journal of Central South University of Technology 2006年第1期13卷 80-86页

作者：谭冠政贺欢 aaron Sloman School of Information Science and Engineering Central South University Changsha 410083 China School of Computer Science The University of Birmingham Birmingham B15 2TT UK School of Information Science and Engineering Central South University Changsha 410083 China School of Computer Science The University of Birmingham Birmingham B15 2TT UK

A novel method of global optimal path planning for mobile robot was proposed based on the improved Dijkstra algorithm and ant system algorithm. This method includes three steps: the first step is adopting the MAKLINK graph theory to establish the free space model of the mobile robot, the second step is adopting the improved Dijkstra algorithm to find out a sub-optimal collision-free path, and the third step is using the ant system algorithm to adjust and optimize the location of the sub-optimal path so as to generate the global optimal path for the mobile robot. The computer simulation experiment was carried out and the results show that this method is correct and effective. The comparison of the results confirms that the proposed method is better than the hybrid genetic algorithm in the global optimal path planning.

关键词： mobile robot global optimal path planning improved Dijkstra algorithm ant system algorithm MAKLINK graph free MAKLINK line

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Loss of CREST leads to neuroinflammatory responses and ALS-like motor defects in mice

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Translational Neurodegeneration 2019年第1期8卷 141-156页

作者： Cheng Cheng Kan yang Xinwei Wu Yuefang Zhang Shifang Shan aaron Gitler Anirvan Ghosh Zilong Qiu Institute of Neuroscience State Key Laboratory of NeuroscienceCAS Center for Excellence in Brain Science and Intelligence TechnologyUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200031China Xiangya Hospital Central South UniversityChangsha 410008China Department of Genetics Stanford University School of MedicineStanfordCA 94305USA Research and Early Development BiogenCambridgeMA 02142USA

Background:Amyotrophic lateral sclerosis(ALS)is a late onset neurodegenerative disease with fast *** has heavy genetic components in which a series of genetic mutations have been *** 2013,Mutations of the CREST gene(also known as SS18L1),which functions as a calcium-regulated transcriptional activator,were found in sporadic ALS ***,the pathogenic causality and mechanisms of ALS-associated mutations of CREST remain to be ***:In this study,we constructed CREST knockout and Q394X knock-in mice with CRISPR/Cas9 *** biochemical and imaging tools,we illustrated core pathological phenotypes in CREST mutant mice and claimed the possible pathogenic ***,we also observed locomotion defects in CREST mutant mice with behavioural ***:We demonstrate that ALS-related CREST-Q388X mutation exhibits loss-of-function ***,the microglial activation was prevalent in CREST haploinsufficiency mice and Q394X mice mimicking the human CREST Q388X ***,we showed that both CREST haploinsufficiency and Q394X mice displayed deficits in motor ***,we identified the critical role of CREST-BRG1 complex in repressing the expression of immune-related cytokines including Ccl2 and Cxcl10 in neurons,via histone deacetylation,providing the molecular mechanisms underlying inflammatory responses within mice lack of ***:Our findings indicate that elevated inflammatory responses in a subset of ALS may be caused by neuron-derived factors,suggesting potential therapeutic methods through inflammation pathways.

关键词： ALS CREST Neuroinflammation Cytokine Microglia

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Trends in forensic DNA database:transnational exchange of DNA data

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Forensic Sciences Research 2020年第1期5卷 8-14页

作者： aaron Opoku Amankwaa Science and Justice Research Interest Group School of LawNorthumbria UniversityNewcastle Upon TyneUK

The transnational exchange of forensic DNA data has become a modern trend in fighting cross-border crime,terrorism and illegal *** DNA data allow the police to identify,eliminate or link individuals associated with a ***,different crime scenes can be linked via the DNA profile to identify serial offenders or determine crime *** to the transnational exchange of DNA data can be categorized into four:(1)creation of an international DNA database,(2)linked or networked national DNA data-bases,(3)request-based exchange of data,and(4)a combination of *** countries operate the combination system of data *** paper briefly introduces the different approaches in the transnational sharing of forensic DNA data,the legislative and operational framework,pattern of data exchange and participating states,and policy challenges associ-ated with data ***,most DNA exchange systems are modelled as the European Union Prüm *** operates under two stages:hit/no-hit query and further information *** scope of the data exchange is governed by individual national legislation that determines the type of information that can be shared and the national authority responsible for the *** DNA data exchange has been instrumental in resolving serious crimes such as gang and serial rape,and armed robbery,adequate infor-mation about their overall effectiveness and efficiency is ***,operational,legal and ethical challenges including issues of privacy and proportionality appear to limit the full potential of the DNA data exchange system.

关键词： Forensic DNA exchange Prüm forensic DNA legislation genetic privacy proportionality social security

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Effects of contaminant metal ions on precipitation recovery of rare earth elements using oxalic acid

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Journal of Rare Earths 2022年第3期40卷 482-490,I0005页

作者： Wencai Zhang aaron Noble Bin Ji Qi Li Department of Mining and Minerals Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA24061USA

Solution equilibrium calculations were performed in this study to understand the impact of contaminant metal ions on the precipitation efficiency of selected rare earth elements(Ce^(3+),Nd^(3+),and Y^(3+))using oxalic acid as a *** metal ions,Al^(3+) and Fe^(3+),are found to considerably affect the precipitation efficiency of *** Al^(3+) and Fe^(3+)concentrations are increased by 1×10^(−4) mol/L,in order to achieve an acceptable cerium recovery of 93%from solutions containing 1×10^(−4) mol/L Ce^(3+),oxalate dosage needs to increase by 1.2×10^(−4) and 1.68×10^(−4) mol/L,*** great impacts on the required oxalate dosage are also observed for Nd^(3+) and Y^(3+),which indicates that oxalic acid consumption and cost will be largely increased when the trivalent metal ions exist in REE-concentrated *** of the divalent metal ions on the oxalate dosage are ***,solution equilibrium calculation results show that the precipitation of Fe^(3+) and Ca^(2+)(e.g.,hematite and Ca(C_(2)O_(4))∙H_(2)O(s))likely occurs during the oxalate precipitation of REEs at relatively high pH(e.g.,pH 2.5),which will reduce rare earth oxalate product *** addition to the metal ions,anionic species,especially SO_(4)^(2-),are also found to negatively affect the precipitation recovery of *** example,when 0.1 mol/L SO_(4)^(2-) occurs in a solution containing 1×10^(−4) mol/L Ce^(3+) and 4×10^(−4) mol/L oxalate,the pH needs to be elevated from 2.0 to 3.3 to achieve the acceptable ***,findings from this study provide guidance for the obtainment of high-purity rare earth products from solutions containing a considerable amount of contaminant metal ions by means of oxalic acid precipitation.

关键词： Rare earth elements Oxalic acid Precipitation Contaminant metal ions

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Frequency dispersion effect and parameters extraction method for novel HfO2 as gate dielectric

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Science China(Information Sciences) 2010年第4期53卷 878-884页

作者： ZHAO aaron TALLAVARJULA Sai Applied Materials Inc Sunnyvale CA 94086USA

The electric characteristic of MOS capacitor with HfO2/SiO2/p-Si grown by ALCVD （atom layer chemical vapor deposition） is investigated. The C-V curves show that the accumulation capacitances take on the frequency dispersion at high frequency. For MOS capacitor with ultra thin HfO2/SiO2gate stack, different fabrication processes and measurement equipment will cause parasitic effect. Here an equivalent circuit model that can eliminate the frequency dispersion effect is proposed. The C-V characteristics curve at high frequency shows some distortion because of the bulk defects and the interface states. This paper discusses the distortion of the high frequency MOS C-V characteristic curve. A data processing method is advanced and interface trap density distribution in the band gap is presented. By comparing the ideal C-V curve with the experimental C-V curve, the typical electrical parameters of MOS capacitor are extracted, including the shift of flat-band voltage, the oxide charges and the density of interface traps at the SiO2/Si interface.

关键词： high k gate dielectric HfO2 frequency dispersion equivalent circuit model two-frequency C-V measurement parameters extraction

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Chiral carbon dots:synthesis,optical properties,and emerging applications

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Light(Science & Applications) 2022年第4期11卷 542-564页

作者： aaron Doring Elena Ushakova Andrey L.Rogach Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong SARChina. Center of Information Optical Technologies ITMO UniversitySaint Petersburg 197101Russia. Shenzhen Research Institute City University of Hong Kong518057 ShenzhenChina

Carbon dots are luminescent carbonaceous nanoparticles that can be endowed with chiral properties,making them particularly interesting for biomedical applications due to their low cytotoxicity and facile *** recent years,synthetic efforts leading to chiral carbon dots with other attractive optical properties such as two-photon absorption and circularly polarized light emission have *** start this review by introducing examples of molecular chirality and its origins and providing a summary of chiroptical spectroscopy used for its *** approaches used to induce chirality in nanomaterials are *** the main part of this review we focus on chiral carbon dots,introducing their fabrication techniques such as bottom-up and top-down chemical syntheses,their morphology,and optical/chiroptical *** then consider emerging applications of chiral carbon dots in sensing,bioimaging,and catalysis,and conclude this review with a summary and future challenges.

关键词： properties synthesis chiral

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Siku tiyao entry for Shiji

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华中学术 2013年第2期 346-353页

作者： aaron Balivet yang Gu Min An 威斯康辛大学麦迪逊分校东亚系美国威斯康辛麦迪逊53705 华中师范大学文学院湖北武汉430079

《史记》一百三十卷内府刊本汉司马迁撰,褚少孙补。迁事迹具《汉书》本传。少孙,据张守节《正义》引张晏之说,以为颖川人,元、成间博士;又引褚《家传》,以为梁相褚大弟之孙,宣帝时为博士,寓居沛,事大儒王式,故号“先生”,二说不同。然... 详细信息

《史记》一百三十卷内府刊本汉司马迁撰,褚少孙补。迁事迹具《汉书》本传。少孙,据张守节《正义》引张晏之说,以为颖川人,元、成间博士;又引褚《家传》,以为梁相褚大弟之孙,宣帝时为博士,寓居沛,事大儒王式,故号“先生”,二说不同。然宣帝末距成帝初不过十七八年,其相去亦未远也。

关键词：史记正义守节内府

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A review of state-of-the-art processing operations in coal preparation

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International Journal of Mining Science and Technology 2015年第4期25卷 511-521页

作者： Noble aaron Luttrell Gerald H. Department of Mining Engineering West Virginia University Department of Mining & Minerals Engineering Virginia Tech

Coal preparation is an integral part of the coal commodity supply chain. This stage of post-mining, pre-utilization beneficiation uses low-cost separation technologies to remove unwanted mineral matter and moisture which hinder the value of the coal product. Coal preparation plants typically employ several parallel circuits of cleaning and dewatering operations, with each circuit designed to optimally treat a specific size range of coal. Recent innovations in coal preparation have increased the efficiency and capac- ity of individual unit operations while reinforcing the standard parallel cleaning approach. This article, which describes the historical influences and state-of-the-art design for the various coal preparation unit operations, is organized to distinguish between coarse/intermediate coal cleaning and fine/ultrafine coal cleaning. Size reduction, screening, classification, cleaning, dewatering, waste disposal unit operations are particularly highlighted, with a special focus on the LI.S. design philosophy. Notable differences between the U.S. and international operations are described as appropriate.

关键词： Coal preparation Coal supply chain Unit operations Particulate separations Tailings disposal

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