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Development and evaluation of corrosion resistant coating for expandable rock bolt against highly corrosive ground conditions

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International Journal of mining Science and Technology 2018年第1期28卷 145-151页

作者： Kevin Jinrong Ma John Stankus Dakota Faulkner keystone mining services LLC of Jennmar Corporation Inc

Expandable rock bolts are widely used in hard rock mines as an efficient ground control ***, capacity and service life can be significantly reduced if the metallic body is subjected to *** some hard rock mines in the U.S., highly corrosive ground conditions exist, and it has been reported that inflatable rock bolts have corroded within a few months after *** provide mining industry a cost-effective inflatable bolt and combat the corrosion issues, Jennmar Corporation, Inc.,and its subsidiary keystone mining services, LLC(KMS), analyzed corroded bolt samples, identified root causes, evaluated properties of various coating materials, and developed a new inflatable rock bolt,Python M3^(TM), that is protected with an innovative PyFlexU2^(TM)*** new generation Python M3^(TM) features improved steel chemistry for reliable performance, modified profile for better inflation, and surface preparation and coating *** PyFlexU2^(TM)is impervious to liquid and air, durable, and UV *** a flexible, adhesive, and highly corrosion-resistant undercoating, and a very hard sacrificial surface coating, the PyFlexU2^(TM)coating system provides the Python M3^(TM)superior protection against chemical corrosion and physical scratch *** under-coating has exceptional flexibility and adhesion to prevent coating micro-cracks or fractures after bolt inflation and possesses excellent corrosion resistance to acids(pH 11), fuels, and salt *** corrosion and scratch resistant PyFlexU2^(TM)coating offers very effective bolt protection for extra longevity in highly corrosive *** Python M3^(TM)coated with PyFlexU2^(TM)has been tested in the most challenging conditions,including laboratory corrosion tests in extreme acidic and basic solvents, rock slurry, and borehole scratch insertion *** demonstrated corrosion and scratch resistance, the product has been greatly welcomed by hard rock min

关键词： Rock bolt Hard rock Corrosive ground condition Bolt corrosion

Relationship between the use of smart medical services and mental health status

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World Journal of Psychiatry 2025年第1期15卷 21-25页

作者： Elif Sarac Ministry of National Defense General Directorate of Management ServicesAnkara 06000Türkiye

In this editorial,I comment on the article by Zhang et *** emphasize the importance of the topic,I discuss the relationship between the use of smart medical devices and mental *** medical services have the potential to positively influence mental health by providing monitoring,insights,and ***,they also come with challenges that need to be *** the primary purpose for which individuals use these smart tech-nologies is essential to tailoring them to specific mental health needs and prefe-rences.

关键词： Smart devices Medical service Usage People Relationship Mental health status

Artificial neural network with a cross-validation approach to blast-induced ground vibration propagation modeling

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Underground Space 2021年第3期6卷 281-289页

作者： Gustavo Paneiro Manuel Rafael DECivil/CERENA Tecnico LisboaULisboaPortugal Orica mining services Portugal Portugal

Given their technical and economic advantages,the application of explosive substances to rock mass excavation is widely ***,because of serious environmental restraints,there has been an increasing need to use complex tools to control environmental effects due to blast-induced ground *** the present study,an artificial neural network(ANN)with k-fold cross-validation was applied to a dataset containing 1114 observations that was obtained from published results;furthermore,quantitative and qualitative parameters were considered for ground vibration amplitude *** best ANN model obtained has a maximum coefficient of determination of 0.840 and a mean absolute error of 5.59 and it comprises 17 input parameters,12 neurons in a one-layer hidden layer,and a sigmoid transfer *** with the traditional models,the model obtained using the proposed methodology demonstrated better generalization ***,the proposed methodology offers an ANN model with higher prediction ability.

关键词： Rock blasting Excavation Ground vibrations Artificial neural network K-fold cross-validation Modeling

Emerging role of A-kinase anchoring protein 5 signaling in reward circuit function

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Neural Regeneration Research 2025年第10期20卷 2913-2914页

作者： William J.Flerlage Mark L.Dell’Acqua Brian M.Cox Fereshteh S.Nugent Uniformed services University of the Health Sciences Department of Pharmacology and Molecular TherapeuticsBethesdaMDUSA Department of Pharmacology University of Colorado School of MedicineAnschutz Medical CampusAuroraCOUSA

There is a strong evidence supporting the hypothesis of synaptic dysfunction as a major contributor to neural circuit and network disruption underlying emotional and mood dysregulation in psychiatric disorders(Simmons et al.,2024).Diverse sets of distinct molecular signaling pathways converge on the synapse to regulate synaptogenesis,synaptic function,and synaptic plasticity in brain regions and circuits through complex interactions organized by numerous multivalent protein scaffolds,including the family of proteins known as A-kinase anchoring proteins(AKAPs).

关键词： function supporting

Using full duplex relaying in device-to-device(D2D)based wireless multicast services:a two-user case

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Science China(Information Sciences) 2015年第8期58卷 6-12页

作者： ZHANG GuoPeng YANG Kun LIU Peng DU Yao Internet of Things Research Center China University of Mining and Technology School of Computer Science and Electronic Engineering University of Essex School of Information and Electrical Engineering China University of Mining and Technology

D2D communication has been proposed as an important supplement to the existing centralized cellular networks which allows two physically adjacent cellular user equipments(UEs) to communicate *** paper concerns using D2 D to improve wireless multicast services in cellular networks. Specially, we consider a D2 D transmitter UE can act as a full-duplex(FD) relay to assist a cellular multicast from a base station(BS) to a group of two UEs. And a new scheme which allows an intra-cell D2 D retransmission to underlay a cellular multicast is proposed. Under the constraint of the minimum signal-to-interference-and-noise ratio(SINR) required by each of the receiver UEs, the aim of the scheme is to select the best UE in a multicast group to perform the D2 D retransmission with the serving BS. Thus, the aggregate transmit power consumed at the BS and at the selected UE can be minimized. The numerical results show that the proposed scheme outperforms traditional cellular multicast scheme as it consumes less transmit power to achieve the same SINR target at the receiver UEs.

关键词： D2D communication cellular multicast full-duplex relaying power control interference management

Development of a multivariate empirical model for predicting weak rock mass modulus

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International Journal of mining Science and Technology 2015年第4期25卷 545-552页

作者： Kallu Raj R. Keffeler Evan R. Watters Robert J. Agharazi Alireza Department of mining Engineering University of Nevada RESPEC Consulting and services University of Nevada Itasca Houston Inc.

Estimating weak rock mass modulus has historically proven difficult although this mechanical property is an important input to many types of geotechnical analyses. An empirical database of weak rock mass modulus with associated detailed geotechnical parameters was assembled from plate loading tests per- formed at underground mines in Nevada, the Bakhtiary Dam project, and Portugues Dam project. The database was used to assess the accuracy of published single-variate models and to develop a multivari- ate model for predicting in-situ weak rock mass modulus when limited geoteehnical data are available. Only two of the published models were adequate for predicting modulus of weak rock masses over lim- ited ranges of alteration intensities, and none of the models provided good estimates of modulus over a range of geotechnical properties. In light of this shortcoming, a multivariate model was developed from the weak rock mass modulus dataset, and the new model is exponential in form and has the following independent variables：（1） average block size or joint spacing, （2） field estimated rock strength, （3） dis- continuity roughness, and （4） discontinuity infilling hardness. The multivariate model provided better estimates of modulus for both hard-blocky rock masses and intensely-altered rock masses.

关键词： In-situ modulus Weak rock mass Preliminary design Elastic deformation

Prevention of gob ignitions and explosions in longwall mining using dynamic seals

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International Journal of mining Science and Technology 2017年第6期27卷 999-1003页

作者： Brune Jürgen F. Saki Saqib A. Department of mining Engineering Colorado School of Mines CO 80401 USA Aldea services LLC Frederick MD 21704 USA

Most, if not all longwall gob areas accumulate explosive methane-air mixtures that pose a deadly hazard to miners. Numerous mine explosions have originated from explosive gas zones(EGZs) in the longwall gob. Since 2010, researchers at the Colorado School of Mines(CSM) have studied EGZ formation in longwall gobs under two long-term research projects funded by the National Institute for Occupational Safety and Health. Researchers used computational fluid dynamics along with in-mine measurements. For the first time, they demonstrated that EGZs form along the fringe areas between the methane-rich atmospheres and the fresh air ventilated areas along the working face and present an explosion and fire hazard to mine workers. In this study, researchers found that, for progressively sealed gobs, a targeted injection of nitrogen from the headgate and tailgate, along with a back return ventilation arrangement, will create a dynamic seal of nitrogen that effectively separates the methane zone from the face air and eliminates the EGZs to prevent explosions. Using this form of nitrogen injection to create dynamic seals should be a consideration for all longwall operators.

关键词： Mine explosions Face ignitions Coal mining Longwall mining Methane

Land Monitoring Network services based on international geospatial standards:SOSI and geoland2/SDI Projects

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International Journal of Digital Earth 2010年第S1期3卷 70-84页

作者： Stephan Meissl Gerhard Triebnig EOX IT services GmbH Thurngasse 8/41090 WienAustria

Spatial Observation services and Infrastructure is a project to develop and verify innovative infrastructure and services within the context of land monitoring and Earth Observation initiatives at European and Member State(MS)*** project’s results contribute to the concept definition of the Shared Environmental Information System(SEIS)emphasising symmetrical online sharing of information as opposed to unidirectional *** a pre-operational set-up,involving the European Environment Agency(EEA),four MS sites and the European Space Agency(ESA),a decentralised information system respecting the Infrastructure for Spatial Information in Europe(INSPIRE)principles is demonstrated integrating distributed data and processing services as well as interactive multi-lingual *** geoland2 project is carried out in the context of Global Monitoring for the Environment and Security(GMES),a joint initiative of the European Commission and ESA,aiming to build up a European capacity for *** Spatial Data Infrastructure(SDI)task shall set up operational services for the discovery,viewing,access and delivery of all products generated in the geoland2 *** paper presents the projects along the five International Standards Organisation(ISO)/Reference Model of Open Distributed Processing viewpoints and concludes with the main recommendation that service provisioning can strongly benefit from a(re-)utilisation of the Service Support Environment(SSE)technology provided sustainably by ESA and from the related rich experience.

关键词： geoland2 SOSI INSPIRE GMES environment monitoring satellite Earth Observation

Quick Web services Lookup Model Based on Hierarchical Registration

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Journal of Donghua University(English Edition) 2003年第2期20卷 69-74页

作者：谢山朱国进陈家训 Information Sciences and Technology College Donghua University 1882 West Yan'an Road Shanghai 200051 P. R. C. Information Sciences and Technology College Donghua University 1882 West Yan'an Road Shanghai 200051 P. R. C.uick Web Services Lookup (Q-WSL) is a new model to registration and lookup of complex services in the Internet. The model is designed to quickly find complex Web services by using hierarchical registration method. The basic concepts of Web services system are introduced and presented and then the method of hierarchical registration of services is described. In particular service query document description and service lookup procedure are concentrated and it addresses how to lookup these services which are registered in the Web services system. Furthermore an example design and an evaluation of its performance are presented. Specifically it shows that the using of attribution-based service query document design and content-based hierarchical registration in Q-WSL allows service requesters to discover needed services more flexibly and rapidly. It is confirmed that Q-WSL is very suitable for Web services system.

Quick Web services Lookup (Q-WSL) is a new model to registration and lookup of complex services in the Internet. The model is designed to quickly find complex Web services by using hierarchical registration method. The basic concepts of Web services system are introduced and presented, and then the method of hierarchical registration of services is described. In particular, service query document description and service lookup procedure are concentrated, and it addresses how to lookup these services which are registered in the Web services system. Furthermore, an example design and an evaluation of its performance are ***, it shows that the using of attributionbased service query document design and contentbased hierarchical registration in Q-WSL allows service requesters to discover needed services more flexibly and rapidly. It is confirmed that Q-WSL is very suitable for Web services system.

关键词： Web services Service Registration Service Lookup UDDI DAML WSDL Jini