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Understanding the multifunctionality in Cu-doped BiVO_4 semiconductor photocatalyst

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Journal of Environmental Sciences 2019年第1期31卷 84-97页

作者： Chhabilal Regmi Yuwaraj K.Kshetri Ramesh Prasad PANDey Tae-Ho kim Gobinda Gyawali Soo Wohn Lee Department of Environmental and Biochemical Engineering Sun Moon University Department of Advanced Materials Engineering Sun Moon University Institute of Biomolecule Reconstruction Department of BT-Convergent Pharmaceutical Engineering Sun Moon University Division of Mechanics and ICT Convergence Engineering Sun Moon University

A visible light-induced, Cu-doped BiVO_4 photocatalyst was synthesized by a microwave hydrothermal method. The photocatalytic efficiency was investigated in the degradation of model water pollutants like Methylene Blue(dye) and ibuprofen(pharmaceuticals), as well as the inactivation of Escherichia coli(bacteria). The Cu-doped BiVO4 samples showed better efficiency than undoped BiVO_4, and the 1 wt.% Cu-doped BiVO_4 sample showed the best efficiency. The degradation of Methylene Blue reached 95%, while the degradation of ibuprofen reached 75%, and the inactivation of E. coli reached 85% in irradiation with visible light. The appearance of additional absorption band shoulders and widening of the optical absorption in the visible range makes the prepared powder an efficient visible light-driven photocatalyst. Moreover, the formation of an in-gap energy state just above the valance band as determined by density functional theory(DFT) first principle calculation, facilitates the wider optical absorption range of the doped system. Similarly, this in-gap energy state also acts as an electron trap, which is favorable for the efficient separation and photoexcited charge carriers' transfer process. The formation of oxygen vacancies due to doping also improved the separation of the charge carrier, which promoted the trapping of electrons and inhibited electron hole recombination, thus increasing the photocatalytic activity. No decrease in the efficiency of the 1 wt.% Cu-doped BiVO_4 photocatalyst in the degradation of ibuprofen over three consecutive cycles revealed the stability of the photocatalyst towards photocorrosion. These findings highlight the multifunctional applications of Cu-doped BiVO_4 in wastewater containing multiple pollutants.

关键词： BiVO4 Photocatalyst Methylene Blue Ibuprofen Escherichia coli First principle calculation

Quantum computation and simulation with vibrational modes of trapped ions

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Chinese Physics B 2021年第6期30卷 1-17页

作者： Wentao Chen Jaren Gan jing-Ning Zhang Dzmitry Matuskevich Kihwan kim Department of Physics Tsinghua UniversityBeijing 100084China Centre for Quantum Technologies National University of Singapore3 Science Drive 2117543 SingaporeSingapore Beijing Academy of Quantum Information Sciences Beijing 100193China Department of Physics National University of Singapore2 Science Drive 3117551 SingaporeSingapore

Vibrational degrees of freedom in trapped-ion systems have recently been gaining attention as a quantum resource,beyond the role as a mediator for entangling quantum operations on internal degrees of freedom,because of the large available Hilbert *** vibrational modes can be represented as quantum harmonic oscillators and thus offer a Hilbert space with infinite *** we review recent theoretical and experimental progress in the coherent manipulation of the vibrational modes,including bosonic encoding schemes in quantum information,reliable and efficient measurement techniques,and quantum operations that allow various quantum simulations and quantum computation *** describe experiments using the vibrational modes,including the preparation of non-classical states,molecular vibronic sampling,and applications in quantum *** finally discuss the potential prospects and challenges of trapped-ion vibrational-mode quantum information processing.

关键词： quantum computation quantum simulation trapped ions vibrational modes

Complete remission of advanced hepatocellular carcinoma by sorafenib: A case report

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World Journal of Gastrointestinal Oncology 2013年第2期5卷 38-42页

作者： Min Su kim Young-Joo jin jin-Woo Lee Jung-il Lee Young soo kim Sun young Lee Myoung Hun Chae Department of Internal Medicine Inha University HospitalInha University School of Medicine

Hepatocellular carcinoma (HCC) is the fifth most common malignant disease worldwide, and curative treatment remains difficult because the majority of cases are diagnosed in the advanced stage. Sorafenib is the only known effective systemic treatment, but patients rarely achieve complete remission (CR). A 66-year-old man with a history of alcoholic liver cirrhosis with a diagnosis of advanced HCC, was initially treated with transarterial chemoembolization on four occasions. However, the disease progressed with portal vein thrombosis. Therefore, sorafenib was started, and 4 mo later, the patient achieved CR. The treatment was continued for 12 mo, and CR was maintained up to 4 mo after sorafenib discontinuation.

关键词： Hepatocellular carcinoma Sorafenib Portal vein thrombosis Complete remission

An Efficient and Spam-Robust Proximity Measure Between Communication Entities

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Journal of Computer Science & Technology 2013年第2期28卷 394-400页

作者： Joo Hyuk Jeon jihwan Song Jeong Eun Kwon Yoon Joon Lee Man Ho Park Myoung Ho kim Department of Computer Science Korea Advanced Institute of Science and Technology Biz Solution Team SK Telecom Information Technology R&D Center Mobile Communication Convergence Research Team Electronics and Telecommunications Research Institute

Electronic communication service providers are obliged to retain communication data for a certain amount of time by their local laws. The retained communication data or the communication logs are used in various applications such as crime detection, viral marketing, analytical study, and so on. Many of these applications rely on effective techniques for analyzing communication logs. In this paper, we focus on measuring the proximity between two communication entities, which is a fundamental and important step toward further analysis of communication logs, and propose a new proximity measure called ESP （Efficient and Spam-Robust Proximity measure）. Our proposed measure considers only the （graph- theoretically） shortest paths between two entities and gives small values to those between spam-like entities and others. Thus, it is not only computationally efficient but also spam-robust. By conducting several experiments on real and synthetic datasets, we show that our proposed proximity measure is more accurate, computationally efficient and spam-robust than the existing measures in most cases.

关键词： proximity closeness spam electronic communication

Microfluidic dual loops reactor for conducting a multistep reaction

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Frontiers of Chemical Science and Engineering 2018年第2期12卷 239-246页

作者： Si hyung jin Jae-Hoon Jung Seong-Geun Jeong Jongmin kim Tae Jung Park Chang-Soo Lee Department of Chemical Engineering Chungnam National University Daejeon 34134 Korea Lotte Chemical R&D Center Daejeon 34110 Korea Department of Chemistry Chung-Ang University Seoul 06974 Korea

Precise control of each individual reaction that constitutes a multistep reaction must be performed to obtain the desired reaction product efficiently. In this work, we present a microfluidic dual loops reactor that enables multistep reaction by integrating two identical loop reactors. Specifically, reactants A and B are synthesized in the first loop reactor and transferred to the second loop reactor to synthesize with reactant C to form the final product. These individual reactions have nano-liter volumes and are carded out in a stepwise manner in each reactor without any cross-contamination issue. To pre- cisely control the mixing efficiency in each loop reactor, we investigate the operating pressure and the operating frequency on the mixing valves for rotary mixing. This microfluidic dual loops reactor is integrated with several valves to realize the fully automated unit operation of a multistep reaction, such as metering the reactants, rotary mixing, transportation, and collecting the product. For proof of concept, CdSeZn nanopartieles are successfully synthesized in a microfluidic dual loops reactor through a fully automated mukistep reaction. Taking all of these features together, this microfluidic dual loops reactor is a general microfluidic screening platform that can synthesize various materials through a multistep reaction.

关键词： microfluidics multistep reaction rotary mixing nanoparticle

Magnetic Force Enhanced Sustainability and Power of Cam-Based Triboelectric Nanogenerator

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Research 2021年第1期2021卷 370-380页

作者： Hakjeong kim Hee Jae Hwang Nghia Dinh Huynh Khanh Duy Pham Kyungwho Choi Dahoon Ahn Dukhyun Choi Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityYongin 17104Republic of Korea Department of Mechanical Engineering Korea Aerospace UniversityGoyang 10540Republic of Korea Division of Mechanical Engineering Kongju National UniversityCheonan 31080Republic of Korea

Since the first invention of triboelectric nanogenerators(TENGs)in 2012,many mechanical systems have been applied to operate TENGs,but mechanical contact losses such as friction and noise are still big obstacles for improving their output performance and ***,we report on a magnet-assembled cam-based TENG(MC-TENG),which has enhanced output power and sustainability by utilizing the non-contact repulsive force between the *** investigate the theoretical and experimental dynamic behaviors of MC-TENGs according to the effects of the contact modes,contact and separation times,and contact forces(i.e.,pushing and repulsive forces).We suggest an optimized arrangement of magnets for the highest output performance,in which the charging time of the capacitor was 2.59 times faster than in a mechanical cam-based TENG(C-TENG).Finally,we design and demonstrate a MC-TENG-based windmill system to effectively harvest low-speed wind energy,~4 m/s,which produces very low ***,it is expected that our frictionless MC-TENG system will provide a sustainable solution for effectively harvesting a broadband of wasted mechanical energies.

关键词： friction magnets generator

Influence of FeO and sulfur on solid state reaction between MnO-SiO_2-FeO oxides and an Fe-Mn-Si solid alloy during heat treatment at 1473 K

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International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 811-819页

作者： Cheng-song Liu Shu-feng Yang Kyung-ho kim jing-she Li Hiroyuki Shibata Shin-ya Kitamura School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Institute of Multidisciplinary Research for Advanced Materials Tohoku University

To clarify the influence of Fe O and sulfur on solid state reaction between an Fe-Mn-Si alloy and Mn O-Si O2-Fe O oxides under the restricted oxygen diffusion flux, two diffusion couples with different sulfur contents in the oxides were produced and investigated after heat treatment at 1473 K. The experimental results were also compared with previous work in which the oxides contained higher Fe O. It was found that although the Fe O content in the oxides decreased from 3wt% to 1wt% which was lower than the content corresponding to the equilibrium with molten steel at 1873 K, excess oxygen still diffused from the oxides to solid steel during heat treatment at 1473 K and formed oxide particles. In addition, increasing the sulfur content in the oxides was observed to suppress the diffusion of oxygen between the alloy and the oxides.

关键词： refining solid state reactions heat treatment incl

Microstructure and Properties of the Cr–Si–N Coatings Deposited by Combining High-Power Impulse Magnetron Sputtering(HiPIMS) and Pulsed DC Magnetron Sputtering

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Acta Metallurgica Sinica(English Letters) 2017年第7期30卷 688-696页

作者： Tie-Gang Wang Yu Dong Belachew Abera Gebrekidan Yan-Mei Liu Qi-Xiang Fan Kwang Ho kim Tianjin Key Laboratory of High Speed Cutting and Precision Manufacturing Tianjin University of Technology and Education Global Frontier R&D Center for Hybrid Interface Materials Pusan National University

The Cr–Si–N coatings were prepared by combining system of high-power impulse magnetron sputtering and pulsed DC magnetron sputtering. The Si content in the coating was adjusted by changing the sputtering power of the Si *** virtue of electron-probe microanalysis, X-ray diffraction analysis and scanning electron microscopy, the influence of the Si content on the coating composition, phase constituents, deposition rate, surface morphology and microstructure was investigated systematically. In addition, the change rules of micro-hardness, internal stress, adhesion, friction coefficient and wear rate with increasing Si content were also obtained. In this work, the precipitation of silicon in the coating was *** increasing Si content, the coating microstructure gradually evolved from continuous columnar to discontinuous columnar and quasi-equiaxed crystals; accordingly, the coating inner stress first declined sharply and then kept almost constant. Both the coating hardness and the friction coefficient have the same change tendency with the increase of the Si content, namely increasing at first and then decreasing. The Cr–Si–N coating presented the highest hardness and average friction coefficient for an Si content of about 9.7 at.%, but the wear resistance decreased slightly due to the high *** above phenomenon was attributed to a microstructural evolution of the Cr–Si–N coatings induced by the silicon addition.

关键词： Cr–Si–N coating High-power impulse magnetron sputtering(HiPIMS) Pulsed DC magnetron sputtering Mechanical property Friction coefficient

Soft and flexible:core-shell ionic liquid resistive memory for electronic synapses

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Microsystems & Nanoengineering 2021年第5期7卷 119-128页

作者： Muhammad Umair Khan Qazi Muhammad Saqib Mahesh Y.Chougale Rayyan Ali Shaukat Jungmin kim jinho Bae Department of Ocean System Engineering Jeju National University102 JejudaehakroJeju 63243Korea

The human brain is the most efficient computational and intelligent system,and researchers are trying to mimic the human brain using solid-state ***,the use of solid-state materials has a limitation due to the movement of ***,soft memory devices are receiving tremendous attention for smooth neurotransmission due to the ion concentration polarization *** paper proposes a core-shell soft ionic liquid(IL)-resistive memory device for electronic synapses using Cu/Ag@AgCI/Cu with multistate resistive *** presence of the Ag@AgCI core shell in the liquid electrolyte significantly helps to control the movement of Cu^(2+)ions,which results in multistate resistive switching *** core-shell IL soft memory device can open a gateway for electronic synapses.

关键词： mechanism gateway electronic