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Water solubility enhancements of pyrene by single and mixed surfactant solutions

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Journal of Environmental Sciences 2001年第4期13卷 491-496页

作者： Zhu, L.-z. chiou, c.T. Department of Environmental Science Zhejiang University Hangzhou 310028 China

Water solubility enhancements of pyrene by both single-surfactant and mixed-surfactant solutions were compared and evaluated. The solubility of pyrene in water was greatly enhanced by each of Triton X-100 (TX100), Triton X-405 (TX405), Brij 35 and SDS, in which the water solubility enhancements increased with increasing surfactant concentrations. The extent of solubility enhancements at surfactant concentrations below. the cMc is the order of TX100 > Brij 35 > TX405 > SDS; the sequence at surfactant concentrations above the cMc is TX100 > Brij 35 > SDS > TX405. Pyrene was solubilized synergistically by anionic-nonionic mixed surfactant solutions, especially at low surfactant concentrations. The synergistic power of the mixed surfactants is SDS-TX405 > SDS-Brij 35 > SDS-TX100. The synergism as noted is attributed to increasing Kmc and/or decreasing the cMc of the mixed surfactant solution. For SDS-TX405 and SDS-Brij 35 mixed surfactant solutions, an increase in Kmc is coupled with a decrease in the cMc; for SDS-TX100, only a decreased in the cMc value is noted. Mixed-surfactant solutions may improve the performance of the surfactant-enhanced remediation (SER) of soils by increasing the bioavailability and biodegradation of non-aqueous-phase organic pollutants and reducing the level of surfactant pollution and remediation expenses.

关键词： Biodegradation concentration (process) Solubility Water

Activation of mitochondrial ATP-sensitive potassium channels delays ischemia-induced cellular uncoupling in rat heart

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Acta Pharmacologica Sinica 2004年第1期 24-30页

作者： Iain c BRUcE china Department of Physiology Faculty of Medicine The University of hong Kong

AIM: To test the hypothesis that cellular uncoupling induced by myocardial ischemia is mediated by activation of cmitochondrial ATP-sensitive potassium channels (mitoKATP). METhODS: Rat hearts were perfused on a Langendorff apparatus and subjected to 40-min ischemia followed by 30-min reperfusion (I/R). changes in cellular coupling were monitored by measuring whole-tissue resistance. RESULTS: (1) In hearts subjected to I/R, the onset of uncoupling started at (13.3±1.0) mm of ischemia; (2) Ischemic preconditioning (IPc) delayed the onset of uncoupling until (22.7±1.3) min. Blocking mitoKATP channels with 5-

关键词： heart mitochondria potassium channels adenosine ttiphosphate ischemic preconditioning uncoupling

Broad learning system based on the quantized minimum error entropy criterion

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Science china(Information Sciences) 2022年第12期65卷 204-219页

作者： Simin ZhANG Zhulin LIU c.L.Philip chEN School of computer Science and Engineering South China University of Technology Pazhou Lab

The broad learning system(BLS) based on the minimum mean square error(MMSE) criterion can achieve outstanding performance without spending too much time in various machine learning ***, when data are polluted by non-Gaussian noise, the stability of BLS may be destroyed because the MMSE criterion is sensitive to outliers. Different from the MMSE criterion, the minimum error entropy(MEE) criterion utilizes the kernel function to capture high-dimensional information and decrease the negative influence of outliers, which will make BLS more discriminative and robust. Nevertheless, the computational complexity of MEE is high due to a double summation of the data size. To solve these issues, this paper proposes a new robust BLS variant based on the quantized minimum error entropy(QMEE) criterion, in which a quantization operation is used to reduce the computational complexity of MEE. The proposed model BLS-QMEE is optimized by the fixed-point iterative method, and a sufficient condition for its convergence is provided. compared with the standard BLS and other existing robust variants of BLS, BLS-QMEE performs more satisfactorily without consuming too much time. The desirable performance of BLS-QMEE is verified by various experiments on function approximation, several public datasets, and a practical application.

关键词： broad learning system quantized minimum error entropy robustness minimum error entropy convergence

Wrinkle-crease interaction behavior simulation of a rectangular membrane under shearing

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Acta Mechanica Sinica 2011年第4期27卷 550-558页

作者： c.-G.Wang.h.-F.Tan.X.-D.he center for composite Materials,harbin Institute of Technology,150080 harbin,china Post-doctoral Research center in Material Science and Engineering,harbin Institute of Technology,150001 harbin,china center for composite Materials Harbin Institute of Technology Harbin China Post-doctoral Research center in Material Science and Engineering Harbin Institute of Technology Harbin China

Wrinkling analysis of a rectangular membrane with a single crease under shearing is performed to understand the wrinkle-crease interaction behaviors. The crease is considered by introducing the residual stresses from creasing and the effective modulus into the baseline configuration with assumed circular cross-sectional crease geometry. The wrinkling analysis of the creased membrane is then performed by using the direct perturb-force （DP） simulation technique which is based on our modified displacement components （MDc） method. Results reveal that the crease may influence the stress transfer path in the membrane and further change the wrinkling direction. The crease appears to improve the bending stiffness of the membrane which has an effective resistance on the wrinkling evolution. The effects of the crease orientation on wrinkle-crease interaction are studied toward the end of this paper. The results show that the wrinkling amplitude, wavelength, and direction increase as the crease orientation increases, and the wrinkling number decreases with the increasing crease orientation. These results will be of great benefit to the analysis and the control of the wrinkles in the membrane structures.

关键词： Membrane structure - Wrinkle-crease interac-tion Membrane wrinkling creased membrane

Use of sub-micron sized resin particles for removal of endocrine disrupting compounds and pharmaceuticals from water and wastewater

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Journal of Environmental Sciences 2017年第1期29卷 256-264页

作者： Audrey Murray Banu rmeci Edward P.c.Lai Department of civil and Environmental Engineering Carleton University Department of chemistry Carleton University

Endocrine disrupting compounds（EDcs） and pharmaceuticals pose a challenge for water and wastewater treatment because they exist at very low concentrations in the presence of substances at much higher concentrations competing for adsorption ***-micron sized resin particles（approximately 300 nm in diameter）（SMR） were tested to evaluate their potential as a treatment for EDcs including：17-β estradiol（E2）,17-α ethinylestradiol（EE2）,estrone（E1）,bisphenol A（BPA）,and diethylstilbestrol（DES） as well as 12 *** were able to remove 98%of spiked E2,80%of EE2,87%of BPA,and up to 97%of DES from *** a 0.5 ppm mixture of E2,EE2,E1,BPA and DES,the minimum removal was24%（E2） and the maximum was 49%（DES）.They were also able to remove the pharmaceuticals from deionized water and ***,SMR are a promising advanced treatment for removal of both EDcs and pharmaceuticals.

关键词： Water treatment Wastewater treatment Pharmaceuticals Endocrine disrupting compounds Micropollutants Adsorption

Ferromagnetism and ferroelectricity in a superlattice of antiferromagnetic perovskite oxides without ferroelectric polarization

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npj computational Materials 2023年第1期9卷 632-637页

作者： Paresh c.Rout Avijeet Ray Udo Schwingenschlögl Physical Sciences and Engineering Division(PSE) King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

We study the structural,electronic,and magnetic properties of the SrcrO_(3)/YcrO_(3) superlattice and their dependence on epitaxial *** discover that the superlattice adopts A-type antiferromagnetic(A-AFM)ordering in contrast to its constituents(SrcrO_(3):c-AFM;YcrO_(3):G-AFM)and retains it under compressive strain while becoming ferromagnetic(5μB per formula unit)at+1%*** obtained ferroelectric polarization is significantly higher than that of the R2NiMnO6/La2NiMnO6(R=ce to Er)series of superlattices[***.5,4021(2014)]due to a large difference between the antipolar displacements of the Sr and Y *** superlattice is a hybrid-improper multiferroic material with a spontaneous ferroelectric polarization(13.5μc/cm^(2))approaching that of bulk BaTiO_(3)(19μc/cm^(2)).The combination of ferromagnetism with ferroelectricity enables multistate memory *** addition,the charge-order-driven p-type semiconducting state of the ferromagnetic phase(despite the metallic nature of SrcrO_(3))is a rare property and interesting for *** carlo simulations demonstrate a magnetic critical temperature of 90 K for the A-AFM phase without strain and of 115 K for the ferromagnetic phase at+5%strain,for example.

关键词： ferroelectric superlattice ferromagnetic

cryogenic nanosecond and picosecond high average and peak power(hAPP) pump lasers for ultrafast applications

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high Power Laser Science and Engineering 2016年第2期4卷 37-67页

作者： David c.Brown Sten Tornegrd Joseph Kolis Snake creek Lasers LLC clemson University Department of Chemistry

Using cryogenic laser technology, it is now possible to design and demonstrate lasers that have concomitant high average and peak powers, with near-diffraction-limited beam quality. We refer to these new laser systems as hAPP lasers. In this paper, we review important laser crystal materials properties at cryogenic temperature, with an emphasis on Yb lasers, and discuss the important design considerations, including the laser-induced damage threshold, nonlinear effects and thermal effects. A comprehensive model is presented to describe diode pulsed pumping with arbitrary duration and repetition rate, and is used with the Frantz–Nodvik equation to describe, to first order, the performance of hAPP laser systems. A computer code with representative results is also described.

关键词： cryogenic lasers high-average-power lasers high-peak-power lasers ultrafast lasers Yb lasers

Deep Reinforcement Learning for Power System Applications: An Overview

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cSEE Journal of Power and Energy Systems 2020年第1期6卷 213-225页

作者： Zidong Zhang Dongxia Zhang Robert c.Qiu Research center For Big Data Engineering And Technologies Shanghai Jiao Tong UniversityShanghai 200240China Department of Electrical and computer Engineering Tennessee Technological UniversityCookevilleTN 38505USA china Electric Power Research Institute Beijing 100192China

Due to increasing complexity, uncertainty and data dimensions in power systems, conventional methods often meet bottlenecks when attempting to solve decision and control prob- lems. Therefore, data-driven methods toward solving such prob- lems are being extensively studied. Deep reinforcement learning (DRL) is one of these data-driven methods and is regarded as real artificial intelligence (AI). DRL is a combination of deep learning (DL) and reinforcement learning (RL). This field of research has been applied to solve a wide range of complex sequential decision-making problems, including those in power systems. This paper firstly reviews the basic ideas, models, algorithms and techniques of DRL. Applications in power systems such as energy management, demand response, electricity market, operational control, and others are then considered. In addition, recent advances in DRL including the combination of RL with other classical methods, and the prospect and challenges of applications in power systems are also discussed.

关键词： Artificial intelligence deep reinforcement learning machine learning power system smart grids

Mid-infrared superabsorbers based on quasi-periodic moiré metasurfaces

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chinese Optics Letters 2018年第5期16卷 12-16页

作者： Yaoran Liu Zilong Wu Eric h. hill Yuebing Zheng Department of Mechanical Engineering and Texas Materials Institute The University of Texas at Austin Austin Texas 78712 USA

We report on mid-infrared superabsorbers based on quasi-periodic moiré metasurfaces in metal-insulator-metal form. By varying the spacer thickness, moiré rotation angle, and filling factor of the superabsorbers, we can tune narrowband or broadband absorption in a systematic way. With their high tunability of near-unity absorption and simple fabrication, in combination with decoupled mode theory for an efficient design, moiré superabsorbers are well-suited for a wide range of applications in sensing, imaging, and communication.

关键词： Mid-infrared superabsorbers based on quasi-periodic moir metasurfaces