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Emerging alternative for artificial ammonia synthesis through catalytic nitrate reduction

Journal of Materials Science & Technology 2021年第18期77卷 163-168页

作者： derek Hao Zhi-gang Chen Monika Figiela Izabela Stepniak Wei Wei bing-Jie Ni Centre for Technology in Water and Wastewater(CTWW) School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)UltimoNSW2007Australia Centre for Future Materials University of Southern QueenslandSpringfield CentralQueensland4300Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQueensland4072Australia Institute of Chemistry and Applied Electrochemistry Faculty of Chemical TechnologyPoznan University of TechnologyBerdychowo 4PL-60965PoznanPoland

Artificial catalytic synthesis of ammonia has become a hot research frontier in recent *** is regarded as a promising approach that may replace the Haber-bosch process and reduce global carbon dioxide ***,it is extremely difficult for the cleavage of nitrogen molecules under ambient *** the ammonia yield rate is still low and the study is still limited in lab *** nitrites or nitrates are used as nitrogen sources,rather than nitrogen gas,the catalytic efficiency can be significantly improved,and the residual nitrate and nitrite contaminations in water systems can be efficiently eliminated and converted to energy sources at the same *** is an emerging alternative for artificial ammonia synthesis,while there is not enough focus on the reduction of nitrate and ***,we systematically compared the differences between the reduction of nitrogen and nitrates,as well as listed the challenges in this *** total conversion rate and energy efficiency of catalytic nitrate reduction are much higher than nitrogen gas reduction due to the much higher solubility and better converting pathway,which might be further enhanced by employing catalysts improvement ***,we also proposed suitable materials as well as a few future researches needs that may help boost the development of artificial ammonia synthesis using nitrate.

关键词： Nitrogen fixation Nitrate reduction Ammonia synthesis Electrocatalysis Photocatalysis

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Mineralized collagen scaffolds fabricated with amniotic membrane matrix increase osteogenesis under inflammatory conditions

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Regenerative biomaterials 2020年第3期7卷 247-258页

作者： Marley J.Dewey Eileen M.Johnson Simona T.Slater derek J.Milner Matthew b.Wheeler brendan A.C.Harley Department of Materials Science and Engineering University of Illinois at Urbana-Champaign110 Roger Adams Laboratory600 S.Mathews Ave.UrbanaIL 61801USA Department of bioengineering University of Illinois at Urbana-Champaign110 Roger Adams Laboratory600 S.Mathews Ave.UrbanaIL 61801USA Department of Chemical and biomolecular Engineering University of Illinois at Urbana-Champaign110 Roger Adams Laboratory600 S.Mathews Ave.UrbanaIL 61801USA Carl R.Woese Institute for Genomic biology University of Illinois at Urbana-Champaign110 Roger Adams Laboratory600 S.Mathews Ave.UrbanaIL 61801USA Department of Animal Sciences University of Illinois at Urbana-Champaign110 Roger Adams Laboratory600 S.Mathews Ave.UrbanaIL 61801USA

Defects in craniofacial bones occur congenitally,after high-energy impacts,and during the course of treatment for stroke and *** injuries are difficult to heal due to the overwhelming size of the injury area and the inflammatory environment surrounding the *** inflammatory response after injury may greatly inhibit regenerative *** have developed mineralized collagen scaffolds that can induce osteogenic differentiation and matrix biosynthesis in the absence of osteogenic media or supplemental *** amniotic membrane is derived from placentas and has been recently investigated as an extracellular matrix to prevent chronic ***,we hypothesized that a mineralized collagen-amnion composite scaffold could increase osteogenic activity in the presence of inflammatory *** report mechanical properties of a mineralized collagen-amnion scaffold and investigated osteogenic differentiation and mineral deposition of porcine adipose-derived stem cells within these scaffolds as a function of inflammatory *** of amniotic membrane matrix promotes osteogenesis similarly to un-modified mineralized collagen scaffolds,and increases in mineralized collagen-amnion scaffolds under inflammatory ***,these findings suggest that a mineralized collagen-amnion scaffold may provide a beneficial environment to aid craniomaxillofacial bone repair,especially in the course of defects presenting significant inflammatory complications.

关键词： mineralized collagen scaffolds amniotic membrane inflammation stem cell osteogenesis

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Organic Geochemical and Petrographic Characteristics of the Coal Measure Source Rocks of Pinghu Formation in the Xihu Sag of the East China Sea Shelf basin: Implications for Coal Measure Gas Potential

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Acta Geologica Sinica(English Edition) 2020年第2期94卷 364-375页

作者： WANG Yang QIN Yong YANG Liu LIU Shimin derek ELSWORTH ZHANG Rui Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou.Jiangsu 221008China School of Resources and Earth Science.China University of Mining and Technology XuzhouJiangsu 221116China Department of Energy and Mineral Engineering G^3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity Park.PA 16802.USA Jiangsu Design Institute of Geology for Mineral Resources XuzhouJiangsu 221006China Neutron Scattering Division.Oak Ridge National Laboratory Oak RidgeTN 37830USA

Coal measure source rocks, located in the Xihu Sag of the East China Sea Shelf basin, were analyzed to define the hydrocarbon generation potential, organic geochemistry/petrology characteristics, and coal preservation conditions. The Pinghu source rocks in the Xihu Sag are mainly gas-prone accompany with condensate oil generation. The coals and shales of the Pinghu Formation are classified from "fair" to "excellent" source rocks with total organic carbon(TOC) contents ranging from 25.2% to 77.2% and 1.29% to 20.9%, respectively. The coals are richer in TOC and S1+S2 than the shales, indicating that the coals have more generation potential per unit mass. Moreover, the kerogen type of the organic matter consists of types Ⅱ-Ⅲ and Ⅲ, which the maturity Ro ranges from 0.59% to 0.83%. Petrographically, the coals and shales are dominated by vitrinite macerals(69.1%–96.8%) with minor proportions of liptinite(2.5%–17.55%) and inertinite(0.2%–6.2%). The correlation between maceral composition and S1+S2 indicates that the main contributor to the generation potential is vitrinite. Therefore, the coals and shales of the Pinghu Formation has good hydrocarbon generation potential, which provided a good foundation for coal measure gas accumulation. Furthermore, coal facies models indicates that the Pinghu coal was deposited in limno-telmatic environment under high water levels, with low tree density(mainly herbaceous) and with low-moderate nutrient supply. Fluctuating water levels and intermittent flooding during the deposition of peat resulted in the inter-layering of coal, shale and sandstone, which potentially providing favorable preservation conditions for coal measure gas.

关键词： hydrocarbon generation potential coal facies coal measure gas Pinghu Formation Xihu Sag

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Perforation optimization of layer-penetration fracturing for commingling gas production in coal measure strata

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Petroleum Science 2022年第4期19卷 1718-1734页

作者： bing Hou Zhuang Cui Ji-Hui Ding Feng-Shou Zhang Li Zhuang derek Elsworth State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BejingBejing102249China MOE Key Laboratory of Petroleum Engineering in China University of Petroleum Beijing 102249China Department of Geophysics Stanford University397 Panama MallStanfordCA94305USA Department of Geotechnical Engineering Tongji UniversityShanghai200092China Korea Institute of Civil Engineering and building Technology Goyang10223South Korea The Pennsylvania State University University ParkPA16802USA

Optimization of fracturing perforation is of great importance to the commingling gas production in coal measure *** this paper,a 3 D lattice algorithm hydraulic fracturing simulator was employed to study the effects of perforation position and length on hydraulic fracture propagation in coal measures of the Lin-Xing block,*** on field data,three lithologic combinations are simulated:1)a thick section of coal seam sandwiched by sandstones;2)a thin coal seam layer overlay by gas-bearing tight sandstone;3)two coal seams separated by a thin layer of *** simulation shows that perforation position and length in multi-layer reservoirs play a major role in hydraulic fracture *** maximum stimulated volume requires consideration of lithologic sequence,coal seam thickness,stress states,and rock *** improve the combined gas production in coal measure strata,it is possible to simultaneously stimulate multiple coal seams or adjacent gas-bearing *** these cases,perforation location and length also significantly impact fracture propagation,and therefore should be carefully *** simulation results using 3 D lattice algorithm are qualitatively consistent with laboratory physical simulation.3 D lattice models can be used to effectively simulate the fracture propagation through layers in coal measure *** numerical results provide guidance for perforation optimization in the hydraulic fracturing of coal measure strata.

关键词： Coal measure strata Combined production 3D lattice algorithm Perforation scheme optimization Fracture propagation

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Controlling effects of differential swelling index on evolution of coal permeability

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 461-472页

作者： Chuanzhong Jiang Zhenfeng Zhao Xiwei Zhang Jishan Liu derek Elsworth Guanglei Cui Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining and TechnologyBeijing100083China Oil&Gas Technology Research Institute Changqing Oilfield CompanyXi’an710018China Department of Chemical Engineering School of EngineeringThe University of Western Australia35 Stirling HighwayCrawleyWA6009Australia Department of Energy and Mineral Engineering G3 Centre and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA16802USA

Coal permeability measurements are normally conducted under the assumption that gas pressure in the matrix is equalized with that in fracture and that gas sorption-induced swelling/shrinking strain is uniformly distributed within the ***,the validity of this assumption has long been questioned and differential strain between the fracture strain and the bulk strain has long been considered as the primary reason for the inconsistency between experimental data and poroelasticity *** efforts have been made to incorporate the impact into coal permeability models,the fundamental nature of those efforts to split the matrix strain between fracture and coal bulk remains *** this study,a new concept of differential swelling index(DSI)was derived to theoretically define the relation among sorption-induced strains of the coal bulk,fracture,and coal matrix at the equilibrium *** was a function of the equilibrium pressure and its magnitudes were regulated by the Langmuir constants of both the matrix and the coal ***,a spectrum of DSI-based coal permeability models was developed to explicitly consider the effect of differential *** models were verified with the experimental data under the conditions of uniaxial strain,constant confining pressure,and constant effective stress.

关键词： Coal permeability Differential swelling behavior Gas adsorption Equilibrium pressure

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A Sensorless State Estimation for A Safety-Oriented Cyber-Physical System in Urban Driving:Deep Learning Approach

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IEEE/CAA Journal of Automatica Sinica 2021年第1期8卷 169-178页

作者： Mohammad Al-Sharman David Murdoch Dongpu Cao Chen Lv Yahya Zweiri derek Rayside William Melek the Department of Electrical and Computer Engineering University of WaterlooWaterloo N2L 3G1Canada the Department of Mechanical and Mechatronics Engineering University of WaterlooWaterloo N2L 3G1Canada the Cognitive Autonomous Driving Lab University of WaterlooWaterloo N2L 3G1Canada the School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 999002Singapore the Faculty of Science Engineering and ComputingKingston University LondonLondon SW153DWUK the Khalifa University Center for Autonomous Robotic Systems Department of Aerospace EngineeringKhalifa UniversityAbu Dhabi 127788UAE

In today's modern electric vehicles,enhancing the safety-critical cyber-physical system(CPS)'s performance is necessary for the safe maneuverability of the *** a typical CPS,the braking system is crucial for the vehicle design and safe ***,precise state estimation of the brake pressure is desired to perform safe driving with a high degree of *** this paper,a sensorless state estimation technique of the vehicle's brake pressure is developed using a deep-learning approach.A deep neural network(DNN)is structured and trained using deep-learning training techniques,such as,dropout and rectified *** techniques are utilized to obtain more accurate model for brake pressure state estimation *** proposed model is trained using real experimental training data which were collected via conducting real vehicle *** vehicle was attached to a chassis dynamometer while the brake pressure data were collected under random driving *** on these experimental data,the DNN is trained and the performance of the proposed state estimation approach is validated *** results demonstrate high-accuracy brake pressure state estimation with RMSE of 0.048 MPa.

关键词： brake pressure state estimation cyber-physical system(CPS) deep learning dropout regularization approach

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Small moleculeπ-conjugated electron acceptor for highly enhanced photocatalytic nitrogen reduction of biObr

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Journal of Materials Science & Technology 2022年第14期109卷 276-281页

作者： derek Hao Tianyi Ma baohua Jia Yunxia Wei Xiaojuan bai Wei Wei bing-Jie Ni Centre for Technology in Water and Wastewater(CTWW) School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)SydneyNSW 2007Australia Centre for Translational Atomaterials Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVIC 3122Australia College of Chemistry and Chemical Engineering Lanzhou City UniversityLanzhou 730070China beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control Beijing University of Civil Engineering and ArchitectureBeijing 102612China

Artificial ammonia synthesis using solar energy is of great significance as it can help narrow the gap to the zero-net emission ***,the current photocatalytic activity is generally too low for mass ***,we report a novel bismuth bromide oxide(biObr)-Tetracyanoquinodimethane(TCNQ)photocatalyst prepared via a facile self-assembly *** to the well-match band structure of TCNQ and bi Obr,the separation and transfer of photogenerated electron-hole pairs were significantly *** importantly,the abundant delocalizedπelectrons of TCNQ,and the electron-withdrawing property of TNCQ made electrons efficiently accumulated on the catalysts,which can strengthen the adsorption and cleavage of nitrogen *** a result,the photocatalytic activity increased *** highest ammonia yield of the optimized sample reached 2.617 mg/(h gcat),which was 5.6-fold as that of pristine biObr and higher than the reported biObr-based *** isotope labeled^(15)N_(2)was used to confirm that the ammonia is formed form the fixation of N_(2).Meanwhile,the sample also had good *** 4-time usage,the photocatalysts still had about 81.8%as the fresh *** results of this work provide a new way for optimizing the electronic structure of photocatalysts to achieve highly efficient photochemical N_(2) reduction.

关键词： biObr TCNQ Nitrogen reduction Electron accepter Photocatalysis。

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The use of electro-deoxidation in molten salts to reduce the energy consumption of solar grade silicon and increase the output of PV solar cells

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Progress in Natural Science:Materials International 2015年第6期25卷 583-590页

作者： Paul R.Coxon Michael Coto Eimutis Juzeliunas derek J.Fray Department of Materials Science & Metallurgy University of Cambridge Institute of Chemistry Centre for Physical Sciences & Technology 3. Klaip?da University

Solar photovoltaics,based upon silicon,are the most popular form of solar cell with efficiencies around 20%.These efficiencies can be further increased by employing light trapping schemes to minimise optical losses through scattering and reflection which enhances the amount of light absorbed and number of photo-carriers *** approaches employ antireflection coatings（ARCs） or texturise the surface of the silicon disks,so that the structure consists of an array of needles which can absorb most of the ***,these structures are created by leaching the silicon with hydrofluoric-based acids or by reactive ion etching（RIE） *** paper reviews some of the methods for improving the energy efficiency of silicon production,and describes the use of electro-deoxidation of SiO;layers,on silicon,in molten calcium chloride to form nanoporous black silicon（b-Si） *** coating b-Si surface with TiO;,a common ARC,extremely black surfaces with negligible reflectance of about 0.1%,are produced,which can have applications for low-cost high efficiency solar cells.

关键词： black silicon Solar cell photovoltaics Silicon molten salt Electrochemistry

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Effects of derived meals from juncea(brassica juncea),yellow and black seeded canola(brassica napus)and multicarbohydrase enzymes supplementation on apparent metabolizable energy in broiler chickens

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Animal Nutrition 2016年第3期2卷 154-159页

作者： balachandar Jayaraman Janice MacIsaac derek Anderson Department of Animal Science University of Manitoba Dalhousie University Faculty of Agriculture

Two experiments were conducted to determine the nitrogen-corrected apparent metabolizable energy(AMEn) of differently processed meals from Juncea(brassica juncea), yellow and black seeded canola(brassica napus), with or without supplementation of multi-carbohydrase enzymes(Enz) in diets for broiler chickens. The first experiment was a 3×2×2 factorial arrangement with the main factors being seed type(yellow [Yellow] or black [b1] canola seeds and Juncea seeds), processed at two temperatures(high temperature desolventized-toasted [HTDT] at 95℃ or low temperature desolventized-toasted[LTDT] at 57℃), with or without Enz. In Exp. 1, a total of 384 one-day-old male broiler chicks were randomly assigned to 64 battery cages, with 6 birds/cage. The second experiment was a 2×2×2 factorial arrangement with the main factors being seed type(Yellow or black [b2]), seed source(Scott,Saskatchewan or Truro, Nova Scotia) and Enz(with or without) supplementation. A total of 264 one-dayold male broiler chicks were randomly assigned to 44 battery cages, with 6 birds per cage. In Exp, 1 and 2,all birds were fed a common starter diet from 1 to 14 days of age. From d 15 to 21, the birds were fed one of the test treatments, a basal grower diet or the basal grower diet replaced with 30% test ingredient with celite(0.8%) added as an inert marker. Excreta was collected on d 20 and 21. In Exp. 1, there were no interactions(P > 0.05) among seed type, processing temperature and Enz. Processing temperature and dietary Enz did not affect(P > 0.05) AMEn of different canola meals. The AMEn of prepress solvent extracted canola and juncea meals(PSEM) from Yellow(11.2 MJ/kg) was higher(P b1(10.2 MJ/kg) and Juncea(10.2 MJ/kg). In Exp. 2, there were no interactions(P > 0.05) among seed color,location and Enz. Supplementation of dietary Enz did not affect(P > 0.05) AMEn of different cold press canola meals. The AMEn of cold press canola meals(CPM) from Yellow(14.7 MJ/kg) was higher(P < 0.05)co

关键词： Canola meal Prepress solvent extraction Cold press extraction AMEn Yellow seeded canola black seeded canola

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Development of intelligent buildings in bahrain

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Journal of Central South University 2009年第S1期16卷 89-94页

作者： MARCH Paul 姚润明 CLEMENTS-CROOME derek School of Construction Management and Engineering University of Reading

There is a growing demand for high building performance,providing better energy efficiency as well as high standard living and workplace. Intelligent buildings (Ibs) will meet the needs of sustainable development in built environment. The Kingdom of bahrain's construction industry has grown significantly in past years to support economic growth,other business sectors,and the aim to be one of the world's major financial centres. This paper aims at investigating current issues regarding intelligent buildings in the Kingdom of bahrain. Case studies of three buildings,which are bahrain Financial Harbour (bFH),bahrain World Trade Centre (bWTC) Project and the bahrain City Centre (bCC) Shopping Mall,have been carried out via structured observation,interview and questionnaire survey in bahrain in 2007. Through this study,we conclude that the pace of construction in bahrain and the Middle East is such that there are lots of scopes for Ibs to develop further,both from the perspective of the number of Ibs being built and also the sophistication of their specifications.

关键词： intelligent buildings (Ibs) energy consumption bahrain middle east

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