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Nanomineralogy of evaporative precipitation of efflorescent compounds from coal mine drainage

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Geoscience Frontiers 2021年第6期12卷 404-410页

作者： luis F.O.Silva Diana Pinto Guilherme l.Dotto james C.Hower Department of Civil and Environmental.Universidad de la Costa CUCCalle 58#55–66BarranquillaAtlanticoColombia Universidade Federal de Santa Maria–UFSM 1000Roraima Avenue97105–900Santa MariaRSBrazil University of Kentucky Department of Earth&Environmental SciencesLexingtonKY40506USA University of Kentucky Center for Applied Energy Research2540 Research Park DriveLexingtonKY40511USA

Efflorescent nanophases(NPs) are found as a transitory accumulation of potentially hazardous elements(PHEs),particularly in tropical climates. The central objective of this study was to investigate the distribution of PHEs with NPs through the evaporative formation structures(EFS) of enormously PHEs-rich coal-mine drainages(CMD). The EFS were studied in natural coal mine drainage for five months in order to determine their geochemical and ecological structures and to assess their position in the reduction of PHEs in nature. The largest coal-fired power plant in South America, located in south Brazil, is used as an example of such a problem. In this work, a novel methodology for the analysis of PHEs in CMD precipitates is proposed for this affected coal *** analytical method, combining X-Ray Diffraction(XRD) and advanced electron microscopies, shows the importance of nanomineralogy in understanding different circumstances of coal contamination. Several ultrafinenanoparticles(UNPs) were identified in the sampled soils and river sediments together with the PHEs. A decrease in PHEs was identified in association with UNPs. However, further investigations are required with regard to the mobility of PHEs in water, atmosphere, soils, and sediments. The EPS was thoroughly studied, acquiring suitable understanding with investigational facts for Ca and Fe-sulphates, pickeringite, and several amorphous phases.

关键词： Coal mine drainage Evaporative precipitation Sediments Water and soil pollution

Investigation of the preparation methodologies of Pd-Cu single atom alloy catalysts for selective hydrogenation of acetylene

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Frontiers of Chemical Science and Engineering 2015年第4期9卷 442-449页

作者： Xinxiang Cao Arash Mirjalili james Wheeler Wentao Xie Ben W.-l. Jang Department of Chemistry Texas A&M University-Commerce Commerce TX 75429-3011 USA

Galvanic replacement, co-impregnation and sequential impregnation have been employed to prepare Pd-Cu bimetallic catalysts with less than 1 wt-% Cu and ca. 0.03 wt-% Pd for selective hydrogenation of acetylene in excess ethylene. High angle annular dark field-scanning transmission electron microscopy （HAADF-STEM） and H2 chemisorption results confirmed that Pd-Cu singleatom alloy structures were constructed in all three bimetallic catalysts. Catalytic tests indicated that when the conversion of acetylene was above 99%, the selectivity of ethylene of these three single atom alloy catalysts was still more than 73%. Furthermore, the single atom alloy catalyst prepared by sequential incipient wetness impregnation was found to have the best stability among the three procedures used.

关键词： palladium-copper bimetallic catalyst singleatom alloy acetylene hydrogenation HAADF-STEM H2pulse chemisorption

Dynamics of self-hybridized exciton–polaritons in 2D halide perovskites

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light(Science & Applications) 2024年第1期13卷 13-22页

作者： Surendra B.Anantharaman Jason lynch Christopher E.Stevens Christopher Munley Chentao li Jin Hou Hao Zhang Andrew Torma Thomas Darlington Francis Coen Kevin li Arka Majumdar Pjames Schuck Aditya Mohite Hayk Harutyunyan Joshua R.Hendrickson Deep Jariwala Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA19104USA KBR Inc. BeavercreekOH45431USA Air Force Research laboratory Sensors DirectorateWright-Patterson Air Force BaseOH45433USA Department of Physics University of WashingtonSeattleWA98195USA Department of Physics Emory UniversityAtlantaGA30322USA Department of Chemical and Biomolecular Engineering Rice UniversityHoustonTX77005USA Department of Materials Science and Nanoengineering Rice UniversityHoustonTX77005USA Applied Physics Program Smalley‐Curl InstituteRice UniversityHoustonTX77005USA Department of Mechanical Engineering Columbia UniversityNew YorkNY10027USA Department of Electrical and Computer Engineering University of WashingtonSeattleWA98195USA

Excitons,bound electron–hole pairs,in two-dimensional hybrid organic inorganic perovskites(2D HOIPs)are capable of forming hybrid light-matter states known as exciton-polaritons(E–Ps)when the excitonic medium is confined in an optical *** the case of 2D HOIPs,they can self-hybridize into E–Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the ***,the fundamental properties of these self-hybridized E–Ps in 2D HOIPs,including their role in ultrafast energy and/or charge transfer at interfaces,remain ***,we demonstrate that>0.5µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E–P *** E–Ps have high Q factors(>100)and modulate the optical dispersion for the crystal to enhance sub-gap absorption and *** varying excitation energy and ultrafast measurements,we also confirm energy transfer from higher energy E–Ps to lower energy E–***,we also demonstrate that E–Ps are capable of charge transport and transfer at *** findings provide new insights into charge and energy transfer in E–Ps opening new opportunities towards their manipulation for polaritonic devices.

关键词： charge polar excitation

Current therapeutic strategies for inflammation following traumatic spinal cord injury

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Neural Regeneration Research 2012年第23期7卷 1812-1821页

作者： Priyanka l.Singh Nitin Agarwal james C.Barrese Robert F.Heary Department of Neurological Surgery UMDNJ-New Jersey Medical SchoolNewarkNJ 07101-1709USA Reynolds Family Spine laboratory NewarkNJ 07101-1709USA

Damage from spinal cord injury occurs in two phases-the trauma of the initial mechanical insult and a secondary injury to nervous tissue spared by the primary *** from damage sustained as a result of direct trauma to the spinal cord,the post-traumatic inflammatory response contributes significantly to functional motor deficits exacerbated by the secondary *** the detrimental aspects of the inflammatory response is a promising strategy to potentially ameliorate the secondary injury,and promote significant functional *** review details how the inflammatory component of secondary injury to the spinal cord can be treated currently and in the foreseeable future.

关键词： acute spinal cord injury inflammation treatment secondary injury neuroprotective hypothermia erythropoietin estrogen etanercept rolipram

Neuron-to-vessel signaling is a required feature of aberrant stem cell commitment after soft tissue trauma

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Bone Research 2022年第3期10卷 615-626页

作者： Qizhi Qin Mario Gomez-Salazar Masnsen Cherief Chase A.Pagani Seungyong lee Charles Hwang Robert J.Tower Sharon Onggo Yuxiao Sun Abhinav Piplani Zhao li Sowmya Ramesh Thomas l.Clemens Benjamin levi Aaron W.james Department of Pathology Johns Hopkins UniversityBaltimoreMD 21205USA Center for Organogenesis and Trauma Department of SurgeryUniversity of TexasSouthwesternTXUSA Department of Plastic Surgery HarvardCambridgeMA 02138USA Department of Orthopaedics Johns Hopkins UniversityBaltimoreMD 21205USA Baltimore Veterans Administration Medical Center BaltimoreMD 21201USA

The functional interdependence of nerves and blood vessels is a well-established concept during tissue morphogenesis, yet the role of neurovascular coupling in proper and aberrant tissue repair is an emerging field of interest. Here, we sought to define the regulatory relationship of peripheral nerves on vasculature in a severe extremity trauma model in mice, which results in aberrant cell fate and heterotopic ossification(HO). First, a high spatial degree of neurovascular congruency was observed to exist within extremity injury associated heterotopic ossification. Vascular and perivascular cells demonstrate characteristic responses to injury,as assessed by single cell RNA sequencing. This vascular response to injury was blunted in neurectomized mice, including a decrease in endothelial proliferation and type H vessel formation, and a downregulation of key transcriptional networks associated with angiogenesis. Independent mechanisms to chemically or genetically inhibit axonal ingrowth led to similar deficits in HO site angiogenesis, a reduction in type H vessels, and heterotopic bone formation. Finally, a combination of single cell transcriptomic approaches within the dorsal root ganglia identified key neural-derived angiogenic paracrine factors that may mediate neuron-to-vascular signaling in HO. These data provide further understanding of nerve-to-vessel crosstalk in traumatized soft tissues, which may reflect a key determinant of mesenchymal progenitor cell fate after injury.

关键词： aberrant trauma nerves

Atomically Dispersed Fe-Co Bimetallic Catalysts for the Promoted Electroreduction of Carbon Dioxide

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Nano-Micro letters 2022年第2期14卷 79-93页

作者： Zhangsen Chen Gaixia Zhang Yuren Wen Ning Chen Weifeng Chen Tom Regier james Dynes Yi Zheng Shuhui Sun Institut National de la Recherche Scientifique-Énergie Matériaux et Télécommunications VarennesQC J3X 1P7Canada School of Materials Science and Engineering University of Science and Technology100083 BeijingPeople’s Republic of China Canadian light Source University of SaskatchewanSaskatoonSK S7N 2V3Canada Research Institute of Photocatalysis State Key Laboratory of Photocatalysis on Energy and EnvironmentFuzhou UniversityFuzhou 350116People’s Republic of China

The electroreduction reaction of CO_(2)(ECO_(2)RR)requires high-performance catalysts to convert CO_(2)into useful *** metal-based atomically dispersed catalysts are promising for the high selectivity and activity in ECO_(2)*** work presents a series of atomically dispersed Co,Fe bimetallic catalysts by carbonizing the Fe-introduced Co-zeolitic-imidazolate-framework(C-Fe-Co-ZIF)for the syngas generation from ECO_(2)*** synergistic effect of the bimetallic catalyst promotes CO *** to the pure C-Co-ZiF,C-Fe-Co-ZIF facilitates CO production with a CO Faradaic efficiency(FE)boost of 10%,with optimal FE_(CO)of 51.9%,FE_(H_(2))of 42.4%at-0.55 V,and CO current density of 8.0 mA cm^(-2)at-0.7 V versus reversible hydrogen electrode(RHE).The H_(2)/CO ratio is tunable from 0.8 to 4.2 in a wide potential window of-0.35 to-0.8 V versus *** total FE_(CO+H_(2))maintains as high as 93%over 10 *** proper adding amount of Fe could increase the number of active sites and create mild distortions for the nanoscopic environments of Co and Fe,which is essential for the enhancement of the CO production in ECO_(2)*** positive impacts of Cu-Co and Ni-Co bimetallic catalysts demonstrate the versatility and potential application of the bimetallic strategy for ECO_(2)RR.

关键词： CO_(2)reduction Electrocatalysis Syngas production Cobalt Iron Bimetallic catalysts

Vascular calcification does not predict anastomotic leak or conduit necrosis following oesophagectomy

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World Journal of Gastrointestinal Surgery 2019年第7期11卷 308-321页

作者： Benjamin J Jefferies Emily Evans james Bundred james Hodson John l Whiting Colm Forde Ewen A Griffiths College of Medical and Dental Sciences University of BirminghamBirmingham B15 2TTUnited Kingdom Department of Radiology University Hospitals Birmingham NHS Foundation TrustBirmingham B15 2WBUnited Kingdom Institute of Translational Medicine University Hospitals Birmingham NHS Foundation TrustBirmingham B15 2TTUnited Kingdom Department of Upper Gastrointestinal Surgery University Hospitals Birmingham NHS Foundation TrustBirmingham B15 2THUnited Kingdom Institute of Cancer and Genomic Sciences University of BirminghamBirmingham B15 2TTUnited Kingdom

BACKGROUND Anastomotic leaks(Al)and gastric conduit necrosis(CN)are serious complications following *** studies have suggested that vascular calcification may be associated with an increased Al rate,but this has not been validated in a United Kingdom *** To investigate whether vascular calcification identified on the pre-operative computed tomography(CT)scan is predictive of Al or *** Routine pre-operative CT scans of 414 patients who underwent oesophagectomy for malignancy with oesophagogastric anastomosis at the Queen Elizabeth Hospital Birmingham between 2006 and 2018 were retrospectively *** of the proximal aorta,distal aorta,coeliac trunk and branches of the coeliac trunk was scored by two *** relationship between these calcification scores and occurrence of Al and CN was then *** Esophagectomy Complications Consensus Group definition of Al and CN was *** Complication data were available in n=411 patients,of whom 16.7%developed either Al(15.8%)or CN(3.4%).Rates of Al were significantly higher in female patients,at 23.0%,compared to 13.9%in males(P=0.047).CN was significantly more common in females,(8.0%vs 2.2%,P=0.014),patients with diabetes(10.6%vs 2.5%,P=0.014),a history of smoking(10.3%vs 2.3%,P=0.008),and a higher American Society of Anaesthesiologists grade(P=0.024).Out of the 14 conduit necroses,only 4 occurred without a concomitant *** statistically significant association was found between calcification of any of the vessels studied and either of these *** analyses were then performed to identify whether a combination of the calcification scores could be identified that would be significantly predictive of any of the ***,the stepwise approach did not select any factors for inclusion in the final *** analysis was repeated for composite outcomes of those patients with either Al or CN(n=69,16.7%)and for those with both Al and CN(n=10,2.

关键词： Oesophagectomy Anastomotic leak Gastric conduit necrosis Calcification Computed tomography Ischaemia

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In Memoriam:*** ***

International Soil and Water Conservation Research 2021年第4期9卷 485-489页

作者： Dennis C.Flanagan Richard M.Cruse james l.Baker Paige Chyu USDA-Agricultural Research Service National Soil Erosion Research LaboratoryWest LafayetteINUSA Department of Agronomy Iowa State UniversityAmesIAUSA Department of Agricultural&Biosystems Engineering Iowa State UniversityAmesIAUSA International Research and Training Center on Erosion and Sedimentation BeijingChina

The soil erosion research and soil and water conservation global community lost a treasured member on November 20,2020,when *** Matthew laflen(Fig.1)*** one with a friendly welcoming smile,John had hundreds of friends,both personally and professionally throughout the *** article includes many of his professional and scientific contributions,and impacts from his research and outreach activities.

关键词： soil hundreds professional

Wing, tail, and vocal contributions to the complex acoustic signals of courting Calliope hummingbirds

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Current Zoology 2011年第2期57卷 187-196页

作者： Christopher james ClARK Peabody Museum of Natural History Yale University PO Box 208106 New Haven CT 06511 USA Museum of Vertebrate Zoology University of California- Berkeley Berkeley CA USA

Multi-component signals contain multiple signal parts expressed in the same physical modality. One way to identify individual components is if they are produced by different physical mechanisms. Here, I studied the mechanisms generating acoustic signals in the courtship displays of the Calliope hummingbirdStellula calliope. Display dives consisted of three synchronized sound elements, a high-frequency tone (hft), a low frequency tone (lft), and atonal sound pulses (asp), which were then followed by a frequency-modulatedfall. Manipulating any of the rectrices (tail-feathers) of wild males impaired production of thelftandaspbut not thehftorfall, which are apparently vocal. I tested the sound production capabilities of the rectrices in a wind tunnel. Single rectrices could generate thelftbut not theasp, whereas multiple rectrices tested together produced sounds similar to theaspwhen they fluttered and collided with their neighbors percussively, representing a previously unknown mechanism of sound production. During the shuttle display, a trill is generated by the wings during pulses in which the wingbeat frequency is elevated to 95 Hz, 40% higher than the typical hovering wingbeat frequency. The Calliope hummingbird courtship displays include sounds produced by three independent mechanisms, and thus include a minimum of three acoustic signal components. These acoustic mechanisms have different constraints and thus potentially contain different messages. Producing multiple acoustic signals via multiple mechanisms may be a way to escape the constraints present in any single mechanism.

关键词：声波信号风琴汽笛蜂鸟声乐求偶物理机制生产能力