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Control Theory and Technology 2019年第3期17卷 201-215页

作者： Y.V.O'BRIEN J.F.O'BRIEN Department of Electrical and Computer Engineering University of Wyoming Laramie WY 82073 U.S.A.

Actuator limits and imperfections introduce multiple nonlinearities in a feedback *** standard mild-feedback systems (e.g.,PID) are intrinsically robust to such nonlinearities,the stability of large feedback systems is *** eliminates from consideration the usage of imperfect actuators in large feedback applications and available disturbance rejection as a result is not *** implementation of multiple-path nonlinear dynamic compensation (NDC),however,allows the combination of large feedback and imperfect actuation and is the focus of this *** nonlinearities due to actuator imperfection are often difficult to model,the stability of the NDC systems is assessed using multivariable absolute stability *** features of a parallel loop recovery system with loop transmission modulus reduction compensation in the quiescent condition are compared to an alternative approach of strict modulus reduction via nonlinear compensation for stability *** of the loop recovery approach is illustrated using experimental data from a voice-coil actuated disturbance rejection system.

关键词： Feedback control imperfect actuators nonlinear dynamic compensation

Reduction,mineralization,and magnetic removal of chromium from soil by using a natural mineral composite

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Environmental Science and Ecotechnology 2022年第3期11卷 64-71页

作者： Xiang Ji Chuanye Zhou Liangxi Chen Yanzhang Li Tianci Hua Yan Li Changqiu Wang Song Jin Hongrui Ding Anhuai Lu Beijing Key Laboratory of Mineral Environmental Function School of Earth and Space SciencesPeking UniversityBeijing100871China Advanced Environmental Technologies LLC 4025 Automation WayUnit F4Fort CollinsCO80525USA Department of Civil and Architectural Engineering University of WyomingLaramieWY82071USA

Reductive immobilization has been a commonly used technique to detoxify Cr(VI)from soil;however,it's challenging to remove the reduced Cr from soil to prevent its *** work explored a natural magnetic composite for the remediation,mineralization,and magnetic removal of Cr(VI)from the *** consists of 77%magnetite and 23%pyrrhotite with strong magnetic properties.A series of characterization tests show that composites of magnetite and pyrrhotite are interlaced and closely bonded,and contain no other heavy *** Cr(VI)removal rate increases with the decrease in composite particle size.A kinetics study shows that removing Cr(VI)by the composite is likely through both adsorption and *** conditions are more favorable for the immobilization of Cr(VI),at 45.8 mg Cr(VI)removal per g of composite at pH *** 100 days of in-situ treatment by the composite,the leaching concentration(TCLP)of Cr(VI)-contaminated soil was 1.95 mg L^(-1),which was below the EPA limit(5 mg L^(-1))for hazardous *** reduction,the composite was separated from soil by magnetic characteristics,and 58.2%of Cr was found *** post-treatment Cr-containing composite was analyzed by SEM-EDS,Raman spectra,and *** was found that Cr was mineralized on the surface of the composite in the form of Cr(OH)3,Cr_(2)O_(3),and FeCr_(2)O_(4).This indicates that reduction and mineralization of Cr(VI)in the soil can be accomplished through natural magnetic mineral composites and easily separated and removed from the soil,achieving a complete soil cleanup.

关键词： Cr Magnetic Mineral composite Mineralization Soil remediation

Determining the Critical Fracture Stress of Al Dendrites near the Melting Point via Synchrotron X-ray Imaging

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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 857-864页

作者： Ling Qin Zhiguo Zhang Baisong Guo Wei Li Jiawei Mi Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou510632China Department of Engineering University of HullEast YorkshireHU67RXUK Center of Innovation for Flow Through Porous Media Department of Petroleum EngineeringUniversity of WyomingLaramieWY82071USA Department of Materials University of OxfordOxfordOX13PHUK

Dendrites are the most common microstructural features in the cast metals,significantly affecting the structure integrity and mechanical properties of the *** this study,the in situ synchrotron X-ray radiographic and tomographic imaging techniques were combined to evaluate the critical fracture stress of the growing dendrite tip during the solidification of an Al-15 wt%Cu alloy under an external electromagnetic *** dendritic 3D models have been proposed to simulate the dendrite 3D morphologic characteristics and thus revealed that the critical fracture stresses of the Al dendrites at temperatures close to its melting point were in the range of 0.5 kPa–0.05 *** present results demonstrate the feasibility of measuring the high-temperature mechanical properties of the metallic dendrites.

关键词： Synchrotron X-ray radiography Tomography Al dendrite Fragmentation Critical fracture stress

Removal of tetracycline from water by Fe-Mn binary oxide

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Journal of Environmental Sciences 2012年第2期24卷 242-247页

作者： Huijuan Liu Yang Yang Jin Kang Maohong Fan Jiuhui Qu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Graduate University Of Chinese Academy of Sciences BeOing 100039 China Hubei Provincial Research Institute of Environmental Science Wuhan 430072 China School of Energy Resources ＆ Department of Chemical ＆ Petroleum Engineering University of V~oming Laramie WY 82071 USA

Significant concerns have been raised over the presence of antibiotics including tetracyclines in aquatic environments.A series of FeMn binary oxide with different Fe：Mn molar ratios was synthesized by a simultaneous oxidation and coprecipitation process for TC *** showed that Fe-Mn binary oxide had higher removal efficiency than that of hydrous iron oxide and hydrous manganese oxide,and that the oxide with a Fe：Mn molar ratio of 5：1 was the best in removal than other molar *** tetracycline removal was highly pH *** removal of tetracycline decreased with the increase of initial concentration,but the absolute removal quantity was more at high *** presence of cations and anions such as Ca2＋,Mg2＋,CO32-and SO42-had no significant effect on the tetracycline removal in our experimental conditions,while SiO32-and PO43-had hindered the adsorption of *** mechanism investigation found that tetracycline removal was mainly achieved by the replacement of surface hydroxyl groups by the tetracycline species and formation of surface complexes at the water/oxide *** primary study suggests that Fe-Mn binary oxide with a proper Fe：Mn molar ratio will be a very promising material for the removal of tetracycline from aqueous solutions.

关键词： Fe-Mn binary oxide tetracycline abatement and removal water treatment

Cardiac-specific knockout of ET_(A)receptor mitigates low ambient temperature-induced cardiac hypertrophy and contractile dysfunction

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Journal of Molecular Cell Biology 2012年第2期4卷 97-107页

作者： Yingmei Zhang Linlin Li Yinan Hua Jennifer M.Nunn Feng Dong Masashi Yanagisawa Jun Ren Department of Cardiology Xijing HospitalFourth Military Medical UniversityXi’an 710032China Center for Cardiovascular Research and Alternative Medicine University of WyomingLaramieWY 82071USA Department of Pharmacology Xinjiang Medical UniversityUrumqiXinjiang 830011P.R.China Howard Hughes Medical Institute University of Texas Southwestern Medical CenterDallasTX 75390USA

Cold exposure is associated with oxidative stress and cardiac *** endothelin(ET)system,which plays a key role in myocardial homeostasis,may participate in cold exposure-induced cardiovascular *** study was designed to examine the role of ET-1 in cold stress-induced cardiac geometric and contractile ***-type(WT)and ETA receptor knockout(ETAKO)mice were assigned to normal or cold exposure(48C)environment for 2 and 5 weeks prior to evaluation of cardiac geometry,contractile,and intracellular Ca21 *** of the temperature sensor transient receptor potential vanilloid(TRPV1),mitochondrial proteins for biogenesis and oxidative phosphorylation,including UCP2,HSP90,and PGC1a were *** stress triggered cardiac hypertrophy,depressed myocardial contractile capacity,including fractional shortening,peak shortening,and maximal velocity of shortening/relengthening,reduced intracellular Ca21 release,prolonged intracellular Ca21 decay and relengthening duration,generation of ROS and superoxide,as well as apoptosis,the effects of which were blunted by *** blotting revealed downregulated TRPV1 and PGC1a as well as upregulated UCP2 and activation of GSK3b,GATA4,and CREB in cold-stressed WT mouse hearts,which were obliterated by *** of HSP90,an essential regulator for thermotolerance,were *** TRPV1 agonist SA13353 attenuated whereas TRPV1 antagonist capsazepine mimicked cold stress-or ET-1-induced cardiac *** GSK3b inhibitor SB216763 ablated cold stress-induced cardiac contractile(but not remodeling)changes and ET-1-induced TRPV1 *** data suggest that ETAKO protects against cold exposure-induced cardiac remodeling and dysfunction mediated through TRPV1 and mitochondrial function.

关键词： low ambient temperature myocardial function ET_(A)receptor TRPV1 mitochondria

Constructing extrinsic oxygen vacancy on the surface of photocatalyst as CO_(2)and electrons reservoirs to improve photocatalytic CO_(2)reduction activity

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Journal of Environmental Sciences 2024年第6期140卷 37-45页

作者： Zaiyong Jiang Hao Li Zhimin Yuan Zheng Wang Maohong Fan Wenkang Miao Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Chemistry&Chemical Engineering and Environmental Engineering Weifang UniversityWeifangShandong 261061China Departments of Chemical and Petroleum Engineering University of WyomingLaramieWY 82071USA Materials Genome Institute Shanghai UniversityShanghai 200444China

Constructing own oxygen vacancies in the photocatalysts is a very promising method to improve their photocatalytic CO_(2)reduction ***,some catalysts have excellent stabilities,making it difficult for them to construct their own oxygen *** simplify the above difficulty of stable photocatalysts,constructing extrinsic oxygen vacancies on their surface as a novel idea is ***,a stable TiO_(2)nanosheet is chosen as a research object,we uniformly deposited BiOCl quantum dots on their surface via a simple adsorption-deposition *** is found that BiOCl quantum dots are able to simultaneously self-transform into defective BiOCl with many oxygen vacancies when the photocatalyst is performed photocatalytic CO_(2)*** extrinsic oxygen vacancies can act as“CO_(2)and photo-generated electrons reservoirs”to improve CO_(2)capture and accelerate the separation of photogenerated electrons and *** the above reasons,the modified TiO_(2)showed obvious enhancement of photocatalytic CO_(2)reduction compared to pristine TiO_(2)and *** work may open a new avenue to broaden the use of oxygen vacancies in the process of photocatalytic CO_(2)reduction.

关键词： Oxygen vacancy BiOCl Photocatalyst CO_(2)reduction TiO_(2)

Removing polybrominated diphenyl ethers in pure water using Fe/Pd bimetallic nanoparticles

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Frontiers of Environmental Science & Engineering 2015年第5期9卷 832-839页

作者： Min ZHANG Jian LU ZhenchengXU Yiliang HF Bo ZHANG Song JIN Brian BOMAN School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Indian River Research and Education-Cenierl U-niversi-ty- of-Florida Fort PierceFL34945USA South China Institute of Environment Sciences Ministry of Environmental Protection Guangzhou 510655 China Department of Civil and Architectural Engineering University of Wyoming Laramie WY 82071 USA

Polybrominated diphenyl ethers （PBDEs） have been widely used as fire-retardants. Due to their high production volume, widespread usage, and environmental persistence, PBDEs have become ubiquitous contaminants in various *** zero-valent iron （ZVI） is an effective reductant for many halogenated organic compounds. To enhance the degradation efficiency, ZVI/ Palladium bimetallic nanoparticles （nZVI/Pd） were synthe- sized in this study to degrade decabromodiphenyl ether （BDE209） in water. Approximately 90% of BDE209 was rapidly removed by nZVI/Pd within 80 min, whereas about 25% of BDE209 was removed by nZVL Degradation of BDE209 by nZVI/Pd fits pseudo-first-order kinetics. An increase in pH led to sharply decrease the rate of BDE209 degradation. The degradation rate constant in the treatment with initial pH at 9.0 was more than 6.8 x higher than that under pH 5.0. The degradation intermediates of BDE209 by nZVI/Pd were identified and the degradation pathways were hypothesized. Results from this study suggest that nZV//Pd may be an effective tool for treating polybromi- nated diphenyl ethers （PBDEs） in water.

关键词： bimetallic nanoparticles nanoscale zerovalent iron polybrominated diphenyl ethers degradation

Applications of Galilei Covariant Electrodynamics to VacuumSubstratum Phenomena in Absolute Space and Time

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Journal of Systems Engineering and Electronics 1995年第4期6卷 59-85页

作者： H E. Wilhelm (AED-Technologies, Thermopolis, wy 82443, U.S. A) AED-Technologies Thermopolis WY 82443 U. S. A

The Galilei covariant generalizations of the EM field equations (1984) (including moving media), Schroedinger, and Dirac (1985, 1993) equations for inertial frames S(w) with substratum velocity w are re- viewed. By G-covariant electrodynamics, physical variables, e.g., rod length, clock rate, particle mass, momentum, and energy are G-invariants, determined by the object velocity v-w= vo=G-inv relative to the substratum frame, So(w=0) [v=object velocity relative to observer in S(w)] Galilean measurements using standard (i) contracted rods and (ii) retarded clocks, anisotropic light propagation, and conservation of EM energy and momentum in IFs S(w) are discussed. Fundamental experiments are formulated which permit measurement of substratum (w) induced EM and charge fields, the substratum velocity w, and verification of the G-invariance of the magnetic field, B= Bo=G-inv. The G-invariant Lagrangian and Hamiltonian of a charged particle in EM fields, and the momentum and energy conservation equations in Particle collisions are given for velocities |v-w| c(ro) and (ii) vacuum for |v-w| > co are relative to the substratum So, and demonstrate the anisotropy of the vacuum in IFs S(w). G-covariant electrodynamics (relative to substratum) contains Lorentz covariant electrodynamics (relative to observer) in the special case w = 0 (So).

关键词： Vacuum substratum Galilei covariance Electrodynamics Quantum mechanics Substratum effects Substratum experiments Failure of special relativity.

Advanced 3D ordered electrodes for PEMFC applications: From structural features and fabrication methods to the controllable design of catalyst layers

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Green Energy & Environment 2024年第9期9卷 1336-1365页

作者： Kaili Wang Tingting Zhou Zhen Cao Zhimin Yuan Hongyan He Maohong Fan Zaiyong Jiang School of Chemistry&Chemical Engineering and Environmental Engineering Weifang UniversityWeifang261061China Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex SystemsCAS Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China College Engineering and Physical Sciences and School of Energy ResourcesUniversity of WyomingLaramieWY 82071USA

The catalyst layers(CLs) electrode is the key component of the membrane electrode assembly(MEA) in proton exchange membrane fuel cells(PEMFCs). Conventional electrodes for PEMFCs are composed of carbon-supported, ionomer, and Pt nanoparticles, all immersed together and sprayed with a micron-level thickness of CLs. They have a performance trade-off where increasing the Pt loading leads to higher performance of abundant triple-phase boundary areas but increases the electrode cost. Major challenges must be overcome before realizing its wide commercialization. Literature research revealed that it is impossible to achieve performance and durability targets with only high-performance catalysts, so the controllable design of CLs architecture in MEAs for PEMFCs must now be the top priority to meet industry goals. From this perspective, a 3D ordered electrode circumvents this issue with a support-free architecture and ultrathin thickness while reducing noble metal Pt loadings. Herein, we discuss the motivation in-depth and summarize the necessary CLs structural features for designing ultralow Pt loading electrodes. Critical issues that remain in progress for 3D ordered CLs must be studied and characterized. Furthermore, approaches for 3D ordered CLs architecture electrode development, involving material design, structure optimization, preparation technology, and characterization techniques, are summarized and are expected to be next-generation CLs for PEMFCs. Finally, the review concludes with perspectives on possible research directions of CL architecture to address the significant challenges in the future.

关键词： PEMFC 3D ordered electrode Structural features Preparation technology Ultralow Pt loading

Functional and immunological peculiarities of peripheral nerve allografts

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Neural Regeneration Research 2022年第4期17卷 721-727页

作者： Kelly C.S.Roballo Jason P.Gigley Tyler A.Smith George D.Bittner Jared S.Bushman School of Pharmacy University of WyomingLaramieWYUSA Department of Molecular Biology University of WyomingLaramieWYUSA Department of Molecular Biosciences University of Texas at AustinAustinTXUSA Department of Neuroscience University of Texas at AustinAustinTXUSA

This review addresses the accumulating evidence that live(not decellularized)allogeneic peripheral nerves are functionally and immunologically peculiar in comparison with many other transplanted allogeneic *** is relevant because live peripheral nerve allografts are very effective at promoting recovery after segmental peripheral nerve injury via axonal regeneration and axon *** the immunological peculiarities of peripheral nerve allografts may also be of interest to the field of transplantation in *** topics are addressed:The first discusses peripheral nerve injury and the potential utility of peripheral nerve allografts for bridging segmental peripheral nerve defects via axon fusion and axon *** second reviews evidence that peripheral nerve allografts elicit a more gradual and less severe host immune response allowing for prolonged survival and function of allogeneic peripheral nerve cells and ***,potential mechanisms that may account for the immunological differences of peripheral nerve allografts are discussed.

关键词： allograft animal model immunology neuroimmunology peripheral nerve injury regeneration repair tissue regeneration tissue transplantation transplant