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Dynamic Intermolecular Space for Reversible CO_(2)Capture and Release

Chinese Journal of Chemical Physics 2025年第1期38卷 8-16,I0001-I0005,I0055页

作者： Jin Zhou Yanan Wang Xiang Zhu Jin Zhao Hrvoje Petek Shijing Tan Bing Wang Hefei National research Center for Physical Sciences at the Microscale and New Cornerstone Science Laboratory University of Science and Technology of ChinaHefei 230026China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Department of Physics and Astronomy and the IQ Initiative University of PittsburghPittsburgh 15260USA

Molecular constructs define the elementary units in porous materials for efficient CO_(2)*** design of appro-priate interpore and intermolecular space is crucial to stabilize CO_(2)molecules and maximize the *** the molecular construct usually has a fixed dimension,whether its inter-molecular space could be self-adjustable during CO_(2)capture and release,behaving as a balloon,has captured *** we report a flexible intermolecular space of the double chain structure of self-assembled 1,4-pheny-lene diisocyanide(PDI)molecules on Ag(110)surface,which dynamically broadens and recovers during the CO_(2)capture and *** incipient PDI double chains organize along the[001]direction of Ag(110),in which individual PDI molecules stand up in a zigzag order with the interchain width defined by twice the Ag lattice distance along_([110])direction(2α_([110])).When CO_(2)molecules are introduced,they assemble to occupy the interchain spaces,expanding the interchain width to 3α_([110]),4α_([110])and 5α_([110]):Warming up the sample leads to the thermally-driven CO_(2)desorption that recovers the original interchain ***-resolution scanning tunneling microscopy(STM)jointly with density functional theory(DFT)calculations determine the structural and electronic interactions of CO_(2)molecules with the dynamical PDI structures,providing a molecular-level perspective for the design of a self-adjustable metal-organic construct for reversible gas capture and release.

关键词： CO_(2)capture Self-assembly Intermolecular interactions Scanning tunneling microscopy

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Learning to Generate Posters of Scientific Papers by Probabilistic Graphical Models

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Journal of Computer Science & Technology 2019年第1期34卷 155-169页

作者： Yu-Ting Qiang Yan-Wei Fu Xiao Yu Yan-Wen Guo Zhi-Hua Zhou Leonid Sigal National Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210046China School of Data Science Fudan UniversityShanghai 200433China disney research pittsburgh Pittsburgh 15241U.S.A.

researchers often summarize their work in the form of scientific *** provide a coherent and efficient way to convey core ideas expressed in scientific *** a good scientific poster,however,is a complex and time-consuming cognitive task,since such posters need to be readable,informative,and visually *** this paper, for the first time,we study the challenging problem of learning to generate posters from scientific *** this end,a data-driven framework,which utilizes graphical models,is ***,given content to display,the key elements of a good poster,including attributes of each panel and arrangements of graphical elements,are learned and inferred from *** the inference stage,the maximum a posterior (MAP)estimation framework is employed to incorporate some design *** order to bridge the gap between panel attributes and the composition within each panel,we also propose a recursive page splitting algorithm to generate the panel layout for a *** learn and validate our model,we collect and release a new benchmark dataset,called NJU-Fudan Paper-Poster dataset,which consists of scientific papers and corresponding posters with exhaustively labelled panels and *** and quantitative results indicate the effectiveness of our approach.

关键词： graphical design layout automation probabilistic graphical model

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Bleeder entry evaluation using condition mapping and numerical modeling

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International Journal of Mining Science and Technology 2021年第1期31卷 137-143页

作者： Ted M.Klemetti Mark A.Van Dyke Gabriel S.Esterhuizen National Institute for Occupational Safety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA

One of the most common critical areas of longwall mining in terms of ground stability are the gateroad and bleeder *** critical entries provide much-needed safe access for miners and allow for adequate ventilation required for dilution of hazardous airborne contaminants and must remain open during mining of a multi-panel *** paper is focused on the stability of the longwall entries subjected to a single abutment load such as bleeders,first tailgate,and last *** tailgate and last headgate are also referred to as blind headgate and tailgate.A study of a longwall district through conditions mapping,support evaluations,and numerical modeling was conducted and evaluated by researchers from the National Institute for Occupational Safety and Health(NIOSH).The condition mapping and support evaluations were performed on entries that spanned the previous five years of mining and relied on a diverse selection of supports to maintain the functionality of the *** modeling was also conducted to evaluate various support types with further investigation and comparison to the condition *** study demonstrated the importance of the abutment load decay versus distance from the gob edge,the potential for a reduction in material handling related injuries,as well as optimal usage of secondary and standing support.

关键词： Stability assessment Bleeder entry Abutment loading Condition mapping Longwall Ground control

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Preliminary rib support requirements for solid coal ribs using a coal pillar rib rating(CPRR)

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International Journal of Mining Science and Technology 2021年第1期31卷 15-22页

作者： Khaled Mohamed Mark Van Dyke Gamal Rashed Morgan MSears Robert Kimutis National Institute for Occupational Safety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA

researchers from the National Institute for Occupational Safety and Health(NIOSH)are developing a coal pillar rib rating(CPRR)technique to measure the integrity of coal *** CPRR characterizes the rib composition and evaluates its impact on the inherent stability of the coal *** CPRR utilizes four parameters:rib homogeneity,bedding condition,face cleat orientation with respect to entry direction,and rib *** these parameters are measurable in the field.A rib data collecting procedure and a simple sheet to calculate the CPRR were *** developed CPRR can be used as a rib quality mapping tool in underground coal mines and to determine the potential of local rib instabilities and support requirements associated with overburden *** calculations were conducted for 22 surveyed solid coal ribs,mainly composed of coal *** on this study,the rib performance was classified into four categories.A preliminary minimum primary rib support density(PRSD)line was obtained from these surveyed *** sample cases are presented that illustrate the data collection form and CPRR calculations.

关键词： Coal rib stability Rib support design Coal pillar rib rating Rib quality mapping CPRR Coal classification

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Coal mine entry rating system:A case study

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International Journal of Mining Science and Technology 2021年第1期31卷 145-151页

作者： Mark A.Van Dyke Ted M.Klemetti Craig Compton National Institute for Occupational Safety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA

Coal mines are continuously seeking to determine the performance of entries with different ground control products and installation *** are many factors that impact how an entry will perform which include but are not limited to geology,overburden,bolting type and pattern,and mine *** the National Institute for Occupational Safety and Health(NIOSH),research has been instituted to examine the relationship of the parts of a coal mine entry as a system and not as individual *** study this relationship,the first step in this study was to create a numeric rating system that accurately reflects visual observations of the mine entry and is easy to *** researchers devised this rating system to improve upon previous ideas,offering increased flexibility which can be incorporated into an overall entry condition that offers different levels of confidence based on the user’s time devoted to the *** new entry rating system was implemented at three different mines over varying periods of time to evaluate the ground response to the geology,bolt installation pattern,stress changes by mining,overburden,and time dependency.

关键词： Coal Geology Rating system Support

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Diesel and welding aerosols in an underground mine

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International Journal of Mining Science and Technology 2020年第4期30卷 449-454页

作者： Aleksandar D.Bugarski Teresa L.Barone Jon A.Hummer National Institute for Occupational Safety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA

researchers from the National Institute for Occupational Safety and Health(NIOSH)conducted a study in an isolated zone of an underground mine to characterize aerosols generated by:(1)a diesel-powered personnel carrier vehicle operated over a simulated light-duty cycle and(2)the simulated repair of existing equipment using manual metal arc welding(MMAW).Both the diesel-powered vehicle and MMAW process contributed to concentrations of nano and ultrafine aerosols in the mine *** welding process also contributed to aerosols with electrical mobility and aerodynamic mobility count median diameters of approximately 140 and 480 nm,*** welding particles collected on the filters contained carbon,iron,manganese,calcium,and aluminum.

关键词： Diesel aerosols Welding aerosols Underground mining Size distribution

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The current perspective of the PA 1957 gas well pillar study and its implications for longwall gas well pillars

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International Journal of Mining Science and Technology 2021年第1期31卷 117-126页

作者： Peter Zhang Daniel Su Chris Mark CDC NIOSH Pittsburgh Mining Research DivisionPittsburghPA 15236USA Mine Safety and Health Administration PittsburghPA 15217USA

Many states rely upon the Pennsylvania 1957 Gas Well Pillar Study to evaluate the coal barrier surrounding gas *** study included 77 gas well failure cases that occurred in the pittsburgh and Freeport coal seams over a 25-year *** the time,coal was mined using the room-and-pillar mining method with full or partial pillar recovery,and square or rectangle pillars surrounding the gas wells were left to protect the *** study provided guidelines for pillar sizes under different overburden depths up to 213 m(700 ft).The 1957 study has also been used to determine gas well pillar sizes in longwall mines since longwall mining began in the 1970 *** original study was developed for room-and-pillar mining and could be applied to gas wells in longwall chain pillars under shallow ***,under deep cover,severe deformations in gas wells have occurred in longwall chain ***,with a better understanding of coal pillar mechanics,new insight into subsidence movements induced by retreat mining,and advances in numerical modeling,it has become both critically important and feasible to evaluate the adequacy of the 1957 study for longwall gas well *** this paper,the data from the 1957 study is analyzed from a new perspective by considering various factors,including overburden depth,failure location,failure time,pillar safety factor(SF),and floor *** pillar SF and floor pressure are calculated by considering abutment pressure induced by full pillar recovery.A statistical analysis is performed to find correlations between various factors and helps identify the most significant factors for the stability of gas wells influenced by retreat *** analyzing the data from the 1957 study,the guidelines for gas well pillars in the 1957 study are evaluated for their adequacy for roomand-pillar mining and their applicability to longwall *** modeling is used to model the stability of gas wells by quantifying the mining-induced s

关键词： Gas well pillar Pennsylvania 1957 gas well pillar study Room-and-pillar mining Longwall mining

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Dynamic skin deformation simulation using musculoskeletal model and soft tissue dynamics

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Computational Visual Media 2017年第1期3卷 49-60页

作者： Akihiko Murai Q.Youn Hong Katsu Yamane Jessica K.Hodgins National Institute of Advanced Industrial Science and Technology Tokyo135-0064Japan Carnegie Mellon University USA disney research USA

Deformation of skin and muscle is essential for bringing an animated character to life. This deformation is difficult to animate in a realistic fashion using traditional techniques because of the subtlety of the skin deformations that must move appropriately for the character design. In this paper, we present an algorithm that generates natural, dynamic, and detailed skin deformation(movement and jiggle) from joint angle data sequences. The algorithm has two steps: identification of parameters for a quasi-static muscle deformation model, and simulation of skin deformation. In the identification step, we identify the model parameters using a musculoskeletal model and a short sequence of skin deformation data captured via a dense marker set. The simulation step first uses the quasi-static muscle deformation model to obtain the quasi-static muscle shape at each frame of the given motion sequence(slow jump). Dynamic skin deformation is then computed by simulating the passive muscle and soft tissue dynamics modeled as a mass–spring–damper system. Having obtained the model parameters, we can simulate dynamic skin deformations for subjects with similar body types from new motion data. We demonstrate our method by creating skin deformations for muscle co-contraction and external impacts from four different behaviors captured as skeletal motion capture data. Experimental results show that the simulated skin deformations are quantitatively and qualitatively similar to measured actual skin deformations.

关键词： three-dimensional graphics and realism musculoskeletal model quasi-static muscle model dynamic skin deformation

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Design of a water curtain to reduce accumulations of float coal dust in longwall returns

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International Journal of Mining Science and Technology 2020年第4期30卷 443-447页

作者： Clara E.Seaman Michael R.Shahan Timothy W.Beck Steven E.Mischler National Institute for Occupational Safety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA

Accumulation of float coal dust(FCD)in underground mines is an explosion hazard that affects all underground coal mine *** this hazard is addressed by the application of rock dust,inadequate rock dusting practices can leave miners exposed to an explosion *** at the National Institute for Occupational Safety and Health(NIOSH)have focused on developing a water curtain that removes FCD from the airstream,thereby reducing the buildup of FCD in mine *** this study,the number and spacing of the active sprays in the water curtain were varied to determine the optimal configuration to obtain peak knockdown efficiency(KE)while minimizing water consumption.

关键词： Float coal dust Longwall Water spray Knockdown efficiency Explosion prevention Dust control

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Coal rib response during bench mining: A case study

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International Journal of Mining Science and Technology 2018年第1期28卷 107-113页

作者： Morgan M.Sears John Rusnak Mark Van Dyke Gamal Rashed Khaled Mohamed Michael Sloan Ground Control Branch NIOSH Pittsburgh Mining Research Division

In 2016, room-and-pillar mining provided nearly 40% of underground coal production in the United *** the past decade, rib falls have resulted in 12 fatalities, representing 28% of the ground fall fatalities in *** coal *** of these 12 fatalities(75%) have occurred in room-andpillar *** objective of this research is to study the geomechanics of bench room-and-pillar mining and the associated response of high pillar ribs at overburden depths greater than 300 *** paper provides a definition of the bench technique, the pillar response due to loading, observational data for a case history, a calibrated numerical model of the observed rib response, and application of this calibrated model to a second site.

关键词： Deep cover Bench mining Thick seam Retreat mining Rib response Rib support

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