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Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao Meng Qingbin Meng Hongwen Jing Bo Meng Jiangyu Wu state Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China state Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China state Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Xinjiang Coal Resources green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

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MULTI-USE RAIN GARDENS:BEST PRACTICE CASE STUDIES OF THE FINANCIALLY CHALLENGED AND CREATIVELY RICH

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Journal of green Building 2015年第4期10卷 1-27页

作者： Sarah Betts bowling green state university

INTRODUCTION Multiuse trails have been a prominent feature of park lands for many ***,multiuse rain gardens may become a prominent feature of many *** gardens have traditionally been used for catchment,retention,and filtration of impervious surface storm water *** can’t they be used for more?County park districts and other agencies across Ohio(and elsewhere)are being pushed more and more toward finding inexpensive creative multi-solutions to issues as a result of limited *** Gardens,bio-swales,butterfly gardens,nature education,natural play,and natural habitat creation all go hand-in-hand…naturally.

关键词： nature education wildlife monitoring habitat creation and enhancement wetland and prairie habitat creation impervious surface water detention and filtration rain barrel roof runoff catchment

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An ontology-based framework for extracting spatio-temporal influenza data using Twitter

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International Journal of Digital Earth 2019年第1期12卷 2-24页

作者： Udaya K.Jayawardhana Pece V.Gorsevski School of Earth Environment&SocietyBowling Green State UniversityBowling GreenOHUSA

Early detection of influenza outbreaks is one of the key priorities on a national level for preparedness and *** study presents the design and implementation of Fluwitter,which is a spatio-temporal webbased prototype framework for pseudo real-time detection of influenza outbreaks from ***,the framework integrates PostgreSQL database server with PostGIS spatial extension,Twitter streaming client,pre-processor,tagger and similarity calculator for semantic information extraction(IE).The IE of tagged terms is supported by Natural Language Processing(NLP)techniques,DBpediaSpotlight and WordNet Similarity for Java(WS4J),while data analytics,visualization,and mapping are supported by GeoServer and other GIS Free Open Source Software(FOSS).The prototype was calibrated to maximize detection of influenza using rules developed from ontology-based semantic similarity *** Twitter-generated influenza cases were validated by weekly hospitalization records issued by Ohio Department of Health(ODH).The optimized rule produced a final F-measure value of 0.72 and accuracy(ACC)value of 94.4%.The validation suggested the existence of moderate correlations for the beginning of the time period Southeast region(r=0.52),the Northwestern region(r=0.38),and the Central region(r=0.33)and weak correlations for the entire time *** potential strengths and benefits of the prototype are shown through spatio-temporal assessment and visualization of influenza potential in Ohio.

关键词： Tweet influenza social media geospatial analytics data mining web mapping

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Global Change Effects on Plant Chemical Defenses against Insect Herbivores

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Journal of Integrative Plant Biology 2008年第11期50卷 1339-1354页

作者： M.Gabriela Bidart-Bouzat Adebobola Imeh-Nathaniel Department of Biological Sciences Bowling Green State University

This review focuses on individual effects of major global change factors, such as elevated CO2, O3, UV light and temperature, on plant secondary chemistry. These secondary metabolites are well-known for their role in plant defense against insect herbivory. Global change effects on secondary chemicals appear to be plant species-specifc and dependent on the chemical type. Even though plant chemical responses induced by these factors are highly variable, there seems to be some specificity in the response to different environmental stressors. For example, even though the production of phenolic compounds is enhanced by both elevated CO2 and UV light levels, the latter appears to primarily increase the concentrations of flavonoids. Likewise, specific phenolic metabolites seem to be induced by O3 but not by other factors, and an increase in volatile organic compounds has been particularly detected under elevated temperature. More information is needed regarding how global change factors influence inducibility of plant chemical defenses as well as how their indirect and direct effects impact insect performance and behavior, herbivory rates and pathogen attack. This knowledge is crucial to better understand how plants and their associated natural enemies will be affected in future changing environments.

关键词： elevated CO2 global climate change insect herbivory ozone plant chemical defenses plant-insect interactions plant secondary metabolites temperature tri-trophic interactions UV light.

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Linking behavior,life history and food supply with the population dynamics of white-footed mice(Peromyscus leucopus)

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Integrative Zoology 2007年第3期2卷 123-130页

作者： Stephen H.VESSEY Kristin B.VESSEY Department of Biological Sciences Bowling Green State UniversityBowling GreenOhioUSA

In this paper we review and integrate key aspects of behavioral and life history traits, food supply and populationdynamics of the white-footed mouse (Peromyscus leucopus), a species that is abundant and widely distributedacross much of eastern North America. Results are based largely on a 33-year mark-and-recapture study in a forestfragment in northwest Ohio, USA. Behavioral plasticity in such reproductive traits as mating system and parentalcare allows this species to adjust quickly to changing environments. The species has a relatively “fast” life history,with rapid attainment of sexual maturity and high fecundity in the face of high mortality rates. Maximal reproductiveeffort early in life enables a rapid population response. Food supply, in the form of mast, determines thesize of the reproducing population in early spring, which, in turn, influences the size of the late summer peak *** peak population size is also affected by short-term weather events possibly acting via the food *** effects of weather and food on population growth are in part mediated through competition, including defenseof space and suppression of reproduction. The inelasticity of female territories appears to set an upper limit topopulation density.

关键词： behavior demography life history mast Peromyscus.

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Calcium regulation of nucleocytoplasmic transport

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Protein & Cell 2011年第4期2卷 291-302页

作者： Ashapurna Sarma Weidong Yang Department of Biological Sciences Center for Photochemical SciencesBowling Green State UniversityBowling GreenOH 43403USA

Bidirectional trafficking of macromolecules between the cytoplasm and the nucleus is mediated by the nuclear pore complexes(NPCs)embedded in the nuclear envelope(NE)of eukaryotic *** NPC functions as the sole pathway to allow for the passive diffusion of small molecules and the facilitated translocation of larger *** shows that these two transport modes and the conformation of NPC can be regulated by calcium stored in the lumen of nuclear envelope and endoplasmic ***,the mechanism of calcium regulation remains poorly *** this review,we integrate data on the observations of calciumregulated structure and function of the NPC over the past ***,we highlight challenges in the measurements of dynamic conformational changes and transient transport kinetics in the ***,an innovative imaging approach,single-molecule superresolution fluorescence microscopy,is introduced and expected to provide more insights into the mechanism of calcium-regulated nucleocytoplasmic transport.

关键词： nuclear envelope nuclear pore complex nucleocytoplasmic transport calcium stores single-molecule fluorescence microscopy

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NONNULL　DISTRIBUTION　OF　THE　LIKELIHOOD　RATIO　CRITERION　FOR　TESTING　THE　EQUALITY　OF　DIAGONAL　BLOCKS　WITH　BLOCKWISE　INDEPENDENCE

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Acta Mathematica Scientia 1994年第2期14卷 195-203页

作者： A. K. Gupta C. C. Chao(bowling green state university bowling green, OH 43403-0221 C. C. ChaoJacksonville state Univesity Jacksonville, AL 36265) bowling green state university bowling green OH 43403–0221 Jacksonville state Univesity Jacksonville AL 36265

In this paper, the nonnull moments and the distributions of the likelihood ratio criterion for testing the equality of diagonal blocks with blockwise independence under certain alternatives have derived.

关键词： RATIO BLOCKWISE CRITERION DIAGONAL DISTRIBUTION EQUALITY FOR INDEPENDENCE LIKELIHOOD NONNULL

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Mate choice decisions by searchers

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Current Zoology 2013年第2期59卷 184-199页

作者： Daniel D. WIEGMANN Lisa M. ANGELONI Steven M. SEUBERT J. GordonWADE Department of Biological Sciences and J. P. Scott Center for Neuroscience Mind and Behavior Bowling Green State University Bowling Green OH 43403 USA Department of Biology Colorado State University Fort Collins CO 80523 USA Department of Mathematics and Statistics Bowling Green State University Bowling Green OH 43403 USA

For more than two decades rudimentary versions of the fixed sample and sequential search strategies have provided the primary theoretical foundation for the study of mate choice decisions by searchers. The theory that surrounds these models has expanded markedly over this time period. In this paper, we review and extend results derived from these models, with a focus on the empirical analysis of searcher behavior. The basic models are impractical for empirical purposes because they rely on the as- sumption that searchers--and, for applied purposes, researchers--assess prospective mates based on their quality, the fitness consequences of mate choice decisions. Here we expound versions of the models that are more empirically useful, reformulated to reflect decisions based on male phenotypic characters. For some organisms, it may be possible to use preference functions to de- rive predictions from the reformulated models and thereby avoid difficulties associated with the measurement of male quality per se. But predictions derived from the two models are difficult to differentiate empirically, regardless of how the models are formu- lated. Here we develop ideas that illustrate how this goal might be accomplished. In addition, we clarify how the variability of male quality should be evaluated and we extend what is known about how this variability influences searcher behavior under each model. More general difficulties associated with the empirical study of mate choice decisions by searchers are also discussed [Current Zoology 59 （2）： 184-199, 2013].

关键词： Dispersive order Fixed sample strategy Mate choice Preference functions Sequential search Stochastic dominance

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A Cross-Layer Cooperative Jamming Scheme for Social Internet of Things

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Tsinghua Science and Technology 2021年第4期26卷 523-535页

作者： Yan Huo Jingjing Fan Yingkun Wen Ruinian Li School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China Department of Computer Science Bowling Green State UniversityBowling GreenOH 43403USA

In this paper,we design a friendly jammer selection scheme for the social Internet of Things(IoT).A typical social IoT is composed of a cellular network with underlaying Device-to-Device(D2D)*** our scheme,we consider signal characteristics over a physical layer and social attribute information of an application layer *** signal characteristics,one of the D2D gadgets is selected as a friendly jammer to improve the secrecy performance of a cellular *** return,the selected D2D gadget is allowed to reuse spectrum resources of the cellular *** social relationship,we analyze and quantify the social intimacy degree among the nodes in IoT to design an adaptive communication time *** an artificial intelligence forecasting model,we further forecast and update the intimacy degree,and then screen and filter potential devices to effectively reduce the detection and calculation ***,we propose an optimal scheme to integrate the virtual social relationship with actual communication *** select the optimal D2D gadget as a friendly jammer,we apply Kuhn-Munkres(KM)algorithm to solve the maximization problem of social intimacy and cooperative *** numerical results are presented to validate the performance of our scheme.

关键词： Internet of Things(IoT) artificial intel igence Device-to-Device(D2D)communications social network cooperative jamming

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The effect of three-dimensional glottal geometry on intraglottal quasi-steady flow distributions and their relationship with phonation

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Science China(Life Sciences) 2006年第1期49卷 82-88页

作者： SCHERER Ronald C. Department of Communication Disorders Bowling Green State University 200 Health Center Bowling Green Ohio 43402 USA

Vocal fold geometry plays an important role in human phonation. The intraglottal quasi-steady pressure; velocity distributions depend upon the shape, size,; diameter of the glottis. This study reports the effects of the variation of glottal shapes on intraglottal pressures; velocities using a Plexiglas model with a glottis having nine symmetric glottal angles (uniform, as well as convergent; divergent 5°, 10°, 20°; 40°), while the minimal glottal diameter was held constant at 0.06 cm. The empirical data were supported by penalty finite element computational results. The results suggest that larger convergent glottal angles correspond to increased pressures; decreased velocities in the glottis upstream of the minimum glottal location, with a reversal of this pattern at the minimal glottal diameter location. The pressure dip near the glottal entrance for divergent glottal angles was greatest for the 10° divergence angle condition,; was sequentially less for 5°, 20°,; 40°. Flow resistance was greater for a convergent angle than a divergent angle of the same value,; least for the 10° divergent condition. Pressure recovery in the glottis suggested that the optimal glottal diffuser angle was near 10°. Results suggest that the glottal geometry has a critical relationship with phonation (especially for vocal efficiency),; therefore important significance to understanding artistic voice; clinical voice management.

关键词： vocal fold geometry, laryngeal aerodynamics modeling, phonation, quasi-steady flow.

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