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Fabrication of ultrafine Nd-Fe-B powder by a modified reduction-diffusion process

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Rare Metals 2006年第z2期25卷 223-226页

作者： jang t.S. LEE D.H. CHOI C.J. SEO W.S. LEE Y.H. Department of Electronic Materials Engineering Sunmoon University Korea Powder Materials Research Center Korea Institute of Machinery and Materials Korea Advanced Materials Analysis & Evaluation Center Korea Institute of Ceramic Engineering and Technology Korea

In order to obtain ultrafine Nd-Fe-B powder, a spray-dried precursor was treated by reduction-diffusion (R/D) process. And, unlike the conventional R/D process, calcium reduction that is a crucial step for the formation of Nd2Fe14B was performed without conglomerating the precursor with Ca powder. By adopting this modified process, it is possible to synthesize the hard magnetic Nd2Fe14B at the reaction temperature as low as 850 ℃. the average size of Nd2Fe14B particles that are uniformly distributed in the optimally treated powder was t Nd2Fe14B particles were enclosed with thin layers of Nd-rich phase. typical magnetic properties of such powder without eliminating impurity CaO were iHc=～5.9 kOe, Br=～5.5 kG, and (BH)max=～6 MGOe.

关键词： NdFeB powder spray drying reduction-diffusion process Nd2Fe14B magnetic powder

Room-temperature sputtered electrocatalyst WSe2 nanomaterials for hydrogen evolution reaction

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Journal of Energy Chemistry 2020年第8期29卷 107-111,I0004页

作者： Jae Hyeon Nam Myeong Je jang Hye Yeon jang Woojin Park Xiaolei Wang Sung Mook Choi Byungjin Cho Department of Advanced Material Engineering Chungbuk National UniversityChungdae-ro 1Seowon-GuCheongjuChungbuk 28644Republic of Korea Surface technology Department Korea Institute of Materials Science797 ChangwonDaeroSungsan-guChangwon 51508Republic of Korea Advanced Materials Engineering Korea University of Science and Technology(UST)217 Gajeong-roYuseong-guDaejeon 34113Republic of Korea Department of Chemical and Materials Engineering University of Alberta9211116 Street NWEdmontonAlberta T6C 1H9Canada

the low-temperature physical vapor deposition process of atomically thin two-dimensional transition metal dichalcogenide(2D tMD) has been gaining attention owing to the cost-effective production of diverse electrochemical catalysts for hydrogen evolution reaction(HER) applications. We, herein, propose a simple route toward the cost-effective physical vapor deposition process of 2D WSe2 layered nanofilms as HER electrochemical catalysts using RF magnetron sputtering at room temperature(trolling the variable sputtering parameters, such as RF power and deposition time, the loading amount and electrochemical surface area(ECSA) of WSe2 films deposited on carbon paper can be carefully determined. the surface of the sputtered WSe2 films are partially oxidized, which may cause spherical-shaped particles. Regardless of the loading amount of WSe2, tafel slopes of WSe2 electrodes in the HER test are narrowly distributed to be ~120–138 mV dec-1, which indicates the excellent reproducibility of intrinsic catalytic activity. By considering the trade-off between the loading amount and ECSA, the best HER performance is clearly observed in the 200 W-15 min sample with an overpotential of 220 mV at a current density of 10 mA cm-2. Such a simple sputtering method at low temperature can be easily expanded to other 2D tMD electrochemical catalysts, promising potentially practical electrocatalysts.

关键词： two dimensional nanomaterials Sputtering WSe2 nanofilm Electrocatalyst Hydrogen evolution reaction

Effect of Gas Distributor Structure on Fluidization Characteristics in a Gas-Solid Fluidized Bed

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China Petroleum Processing & Petrochemical technology 2020年第2期22卷 102-110页

作者： jang kwangbyol Feng Yali Li Haoran School of Civil&Resource Engineering University of Science and Technology BeijingBeijing 100083 National key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100080

In the present paper,the experimental method and computational fluid dynamics(CFD)method were used to investigate the effect of gas distributors with different orifice sizes and orifice pitches on fluidization characteristics in a gas-solid fluidized *** Euler-Euler two fluid model(tFM)approach based on the kinetic theory of granular flow(ktGF)and the standard k-epsilon turbulence model was employed in the numerical simulation by using ANSYS Fluent *** results showed that the orifice size and the orifice pitch of gas distributor had a significant influence on the flow characteristics in the gas-solid fluidized *** a decreasing orifice size and orifice pitch of gas distributor having the same opening area,the distributor pressure drop,the initial bubble size,and the height of dead zone just above the distributor were decreased,and the bed pressure drop was increased more than that of the larger orifice size and orifice pitch of distributors,the distribution of solid volume fraction was also more homogeneous for the smaller orifice size.

关键词： fluidized bed gas distributor orifice size bubble numerical simulation

Endovascular treatment of a ruptured pseudoaneurysm of the internal carotid artery in a patient with nasopharyngeal cancer:A case report

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World Journal of Clinical Cases 2022年第25期10卷 9121-9126页

作者： Jung-Soo Park Hyoung Gyu jang Department of Neurosurgery Jeonbuk National University Medical School and HospitalJeonju 54907South Korea

BACkGROUND Radiation therapy(Rt)for nasopharyngeal cancer can cause several *** rare cases,an internal carotid artery pseudoaneurysm can occur,which can be *** report the experience of a nasopharyngeal cancer patient who underwent radiation therapy and subsequently developed a fatal pseudoaneurysm of the petrous internal carotid *** SUMMARY A 39-year-old man was diagnosed with nasopharyngeal cancer 2 years ago(American Joint Committee on Cancer Stage t3N2M0)and received concurrent chemoradiation *** subsequently relapsed and received *** week after the 4th cycle of chemotherapy,he was admitted to the emergency room of our hospital because of massive epistaxis accompanied by a headache.A pseudoaneurysm of the petrous internal carotid artery was confirmed by digital subtraction angiography(DSA).Stent-assisted endovascular coil embolization was performed and complete occlusion was *** pseudoaneurysm was observed on DSA after coil embolization;however,intermittent epistaxis was maintained even after coil *** seven days,a diagnostic laryngoscopy was *** bleeding occurred after aspiration of the blood clot during the laryngoscopy and the patient died of hypovolemic *** this case,epistaxis may have been a sign of pseudoaneurysm;therefore,treatment such as embolization should be performed promptly,and careful management should be undertaken after *** this case highlights a rare,serious complication of Rt in nasopharyngeal cancer and how it should be recognized and treated.

关键词： Pseudoaneurysm Nasopharyngeal cancer Radiation therapy Epistaxis Carotid artery pseudoaneurysm Case report

Selective hydrogenation of acetylene over Pd/CeO2

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Frontiers of Chemical Science and Engineering 2020年第6期14卷 929-936页

作者： kai Li tengteng Lyu Junyi He Ben W.L.jang Department of Chemistry Texas A&M University CommercePO Box 3011CommerceTX 75429USA

Five hundred ppm Pd/CeO2 catalyst was prepared and evaluated in selective hydrogenation of acetylene in large excess of ethylene since ceria has been recently found to be a reasonable stand-alone catalyst for this ***/CeO2 catalyst could be activated in situ by the feed gas during reactions and the catalyst without reduction showed much better ethylene selectivity than the reduced one in the high temperature range due to the formation of oxygen vacancies by *** ethylene selectivity of〜100%was obtained in the whole reaction temperature range of 50℃-200℃ for samples calcined at temperatures of 600℃ and 800℃.this could be ascribed to the formation of PdX-Ce1-xO2-y or Pd-O-Ce surface species based on the X-ray diffiaction and X-ray photoelectron spectroscopy results,indicating the strong interaction between palladium and ceria.

关键词： selective hydrogenation acetylene Pd/CeO2 strong interaction

the host-targeting compound peruvoside has a broad-spectrum antiviral activity against positive-sense RNA viruses

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Acta Pharmaceutica Sinica B 2023年第5期13卷 2039-2055页

作者： kan Xing Wu thinesshwary Yogarajah Marcus Wing Choy Loe Parveen kaur Regina Ching Hua Lee Chee keng Mok Yi Hao Wong Patchara Phuektes Li Sze Yeo Vincent t.k.Chow Yong Wah tan Justin jang Hann Chu Department of Microbiology and Immunology Yong Loo Lin School of MedicineNational University Health SystemNational University of SingaporeSingapore 117597Singapore Department of Pathobiology Faculty of Veterinary MedicineKhonkaen UniversityKhonkaen 40002Thailand Infectious Disease Programme Yong Loo Lin School of MedicineNational University of SingaporeSingapore 117597Singapore Institute of Molecular and Cell Biology Agency for ScienceTechnology and Research(A∗STAR)Singapore 138648Singapore Lee kong Chian School of Medicine Nanyang Technological UniversitySingapore 308232Singapore NUSMed Biosafety Level 3 Core Facility Yong Loo Lin School of MedicineNational University of SingaporeSingapore 117599Singapore

Positive-sense RNA viruses modify intracellular calcium stores,endoplasmic reticulum and Golgi apparatus(Golgi)to generate membranous replication organelles known as viral *** factories provide a conducive and substantial enclave for essential virus replication via concentrating necessary cellular factors and viral proteins in ***,we identified the vital role of a broadspectrum antiviral,peruvoside in limiting the formation of viral ***,we revealed the pleiotropic cellular effect of Src and PLC kinase signaling via cyclin-dependent kinase 1 signaling leads to Golgi-specific brefeldin A-resistance guanine nucleotide exchange factor 1(GBF1)phosphorylation and Golgi vesiculation by peruvoside *** ramification of GBF1 phosphorylation fosters GBF1 deprivation consequentially activating downstream antiviral signaling by dampening viral factories *** investigation showed signaling of ERk1/2 pathway via cyclin-dependent kinase 1 activation leading to GBF1 phosphorylation at threonine 1337(t1337).We also showed 100%of protection in peruvoside-treated mouse model with a significant reduction in viral titre and without measurable cytotoxicity in *** findings highlight the importance of dissecting the broad-spectrum antiviral therapeutics mechanism and pave the way for consideration of peruvoside,host-directed antivirals for positive-sense RNA virus-mediated disease,in the interim where no vaccine is available.

关键词： Positive-sense RNA viruses Peruvoside Antiviral CDkI signaling Viral factories Calcium efflux Broad-spectrum Golgi apparatus

Versatile control of concentration gradients in non-fullerene acceptor-based bulk heterojunction films using solvent rinse treatments

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Green Energy & Environment 2022年第5期7卷 1102-1110页

作者： Chang-Mok Oh Soyeong jang Jihoon Lee Sung Heum Park In-Wook Hwang Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju61005Republic of Korea Department of Physics Pukyong National UniversityBusan48513Republic of Korea

Solvent rinse treatments using polar methanol(Me OH)and nonpolar n-hexane have been developed for controlling material concentration gradients along the longitudinal direction of non-fullerene acceptor-based bulk heterojunction(BHJ)films comprised of electron donor polymer,PBDB-t and acceptor,*** the used solvents(chlorobenzene with 1 vol%DIO)were completely evaporated,ItIC-m rich domains were formed at the top surface of the BHJ films after they were rinsed with Me OH,as evidenced by water contact angle,atomic force microscopy,time-of-flight secondary ion mass spectroscopy,which led to enhanced electron transport in the conventional structure of organic solar cells(OSCs).In contrast,after rinsing with n-hexane,ItIC-m rich domains were formed at the bottom surface of the films,which improved electron transport in the inverted structure *** enhanced carrier transports increased the PCEs(11.80%and 11.15%)in both conventional and inverted OSCs by 10.29%and 10.35%compared with control *** versatile control of material concentration gradients is determined to be feasible owing to the chemical interaction of the used substrates(glass,PEDOt:PSS,and Zn O)and rinsing solvents.

关键词： films treatment heterojunction

钢铁厂超低排放改造减污降碳及空气质量影响研究

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环境科学学报 2024年第4期44卷 263-276页

作者：郑阿猛朱云张志诚曹志涛连燕卫文华刘子义袁颖枝华南理工大学环境与能源学院广东省大气环境与污染控制重点实验室广州510006 萍乡市生态环境局萍乡337000 罗克佳华科技集团股份有限公司北京101111

钢铁行业是我国大气污染物和CO_(2)排放主要来源之一,超低排放改造是其推进减污降碳的关键措施.以萍乡市某典型钢铁厂为例,以2019为基准年,编制了钢铁厂超低排放改造前后CO_(2)和大气污染物排放清单,并综合运用WRF-CMAQ空气质量模型和... 详细信息

钢铁行业是我国大气污染物和CO_(2)排放主要来源之一,超低排放改造是其推进减污降碳的关键措施.以萍乡市某典型钢铁厂为例,以2019为基准年,编制了钢铁厂超低排放改造前后CO_(2)和大气污染物排放清单,并综合运用WRF-CMAQ空气质量模型和数据融合技术,量化评估了该钢铁厂烧结机超低排放改造和全流程超低排放改造对空气质量的影响.结果显示,该钢铁厂实施全流程超低排放改造后CO_(2)减排91.67万t(下降率19.94%),同时,SO_(2)、NO_(x)、PM_(10)、PM_(2.5)和VOCs分别减排824.89(59.13%)、3642.04(73.90%)、2096.59(49.66%)、1473.43(45.69%)、789.56(49.90%)t.评估结果表明,烧结工序实施超低排放改造对萍乡市SO_(2)浓度降低影响最大,SO_(2)浓度降幅为3.61%;而全流程超低排放改造可进一步改善萍乡空气质量状况,除O_(3)上升2.85%外,其余大气污染物降幅为2.77%~6.83%.

关键词：钢铁厂超低排放改造污碳减排空气质量 WRF-CMAQ

Fragmentation stability and retention time-shift obtained by LC-MS/MS to distinguish sialylated N-glycan linkage isomers in therapeutic glycoproteins

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Journal of Pharmaceutical Analysis 2023年第3期13卷 305-314页

作者： Chi Soo Park Minju kang Ahyeon kim Chulmin Moon Mirae kim Jieun kim Subin Yang Leeseul jang Ji Yeon jang Ha Hyung kim Department of Global Innovative Drugs Graduate School of Chung-Ang UniversitySeoul06974Republic of Korea

Sialylated N-glycan isomers withα2-3 orα2-6 linkage(s)have distinctive roles in glycoproteins,but are difficult to ***-type(Wt)and glycoengineered(mutant)therapeutic glycoproteins,cytotoxic t lymphocyte-associated antigen-4-immunoglobulin(CtLA4-Ig),were produced in Chinese hamster ovary cell lines;however,their linkage isomers have not been *** this study,N-glycans of CtLA4-Igs were released,labeled with procainamide,and analyzed by liquid chromatography-tandem mass spectrometry(MS/MS)to identify and quantify sialylated N-glycan linkage *** linkage isomers were distinguished by comparison of 1)intensity of the N-acetylglucosamine ion to the sialic acid ion(Ln/Nn)using different fragmentation stability in MS/MS spectra and 2)retention time-shift for a selective m/z value in the extracted ion *** isomer was distinctively identified,and each quantity(>0.1%)was obtained relative to the total N-glycans(100%)for all observed ionization *** sialylated N-glycan isomers with onlyα2-3 linkage(s)in Wt were identified,and each isomer's sum of quantities was 50.4%.Furthermore,39 sialylated N-glycan isomers(58.8%)in mono-(3 N-glycans;0.9%),bi-(18;48.3%),tri-(14;8.9%),and tetra-(4;0.7%)antennary structures of mutant were obtained,which comprised mono-(15 N-glycans;25.4%),di-(15;28.4%),tri-(8;4.8%),and tetra-(1;0.2%)sialylation,respectively,with onlyα2-3(10 N-glycans;4.8%),bothα2-3 andα2-6(14;18.4%),and onlyα2-6(15;35.6%)linkage(s).these results are consistent with those forα2-3 neuraminidase-treated *** study generated a novel plot of Ln/Nn versus retention time to distinguish sialylated N-glycan linkage isomers in glycoprotein.

关键词： therapeutic glycoprotein Sialylation Linkage isomer LC-MS/MS