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Achieving Ultra-Broad Microwave Absorption Bandwidth Around Millimeter-Wave Atmospheric Window Through an Intentional Manipulation on Multi-Magnetic Resonance Behavior

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Nano-Micro Letters 2024年第9期16卷 291-307页

作者： Chuyang Liu Lu Xu Xueyu Xiang Yujing Zhang Li Zhou Bo Ouyang Fan Wu dong‑hyun kim Guangbin Ji School of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016JiangsuPeople’s Republic of China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Physics Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Physics Chungbuk National UniversityCheongju 28644South Korea Department of Chemistry School of ScienceTianjin UniversityTianjin 300072People’s Republic of China

The utilization of electromagnetic waves is rapidly advancing into the millimeter-wave frequency range,posing increasingly severe challenges in terms of electromagnetic pollution prevention and radar ***,existing millimeter-wave absorbers are still inadequate in addressing these issues due to their monotonous magnetic resonance *** this work,rare-earth La^(3+)and non-magnetic Zr^(4+)ions are simultaneously incorporated into M-type barium ferrite(BaM)to intentionally manipulate the multi-magnetic resonance *** leveraging the contrary impact of La^(3+)and Zr^(4+)ions on magnetocrystalline anisotropy field,the restrictive relationship between intensity and frequency of the multi-magnetic resonance is successfully *** magnetic resonance peak-differentiating and imitating results confirm that significant multi-magnetic resonance phenomenon emerges around 35 GHz due to the reinforced exchange coupling effect between Fe^(3+)and Fe^(2+)***,Mosbauer spectra analysis,first-principle calculations,and least square fitting collectively identify that additional La^(3+)doping leads to a profound rearrangement of Zr^(4+)occupation and thus makes the portion of polarization/conduction loss increase *** a consequence,the La^(3+)-Zr^(4+)co-doped BaM achieves an ultra-broad bandwidth of 12.5+GHz covering from 27.5 to 40+GHz,which holds remarkable potential for millimeter-wave absorbers around the atmospheric window of 35 GHz.

关键词： Microwave absorption Ultra-broad bandwidth M-type barium ferrite Magnetocrystalline anisotropy field Multimagnetic resonance

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Production of chitosan-based composite film reinforced with lignin-rich lignocellulose nanofibers from rice husk

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Journal of Bioresources and Bioproducts 2024年第2期9卷 174-184页

作者： Hye Jee Kang Yeon Ju Lee Jin Kyoung Lee Irnia Nurika Sri Suhartini Deokyeong Choe dong hyun kim Hoon Choi Natasha P.Murphy Ho Yong kim Young Hoon Jung School of Food Science and Biotechnology Kyungpook National UniversityDaegu 41566Republic of Korea CPR S&T Co. Ltd.Gunpo 15880Republic of Korea Department of Agroindustrial Technology Faculty of Agricultural TechnologyUniversitas BrawijayaMalang 65145Indonesia Renewable Resources and Enabling Sciences Center National Renewable Energy LaboratoryGoldenCO 80401United States Center for Bio-based Chemistry Korea Research Institute of Chemical TechnologyUlsan 44429Republic of Korea

Lignocellulosic nanofibers(LCNFs),implying lignin-containing cellulose fibers,maintain the prop-erties of both lignin and cellulose,which are hydrophobic and hydrophilic,*** pres-ence of hydrophobic lignin in LCNFs is expected to be an economical and attractive option that can improve the thermal and mechanical properties of ***,this study was conducted to produce lignin-rich LCNFs from sugar-rich waste obtained from rice husks after acidic *** LCNFs were produced from the lignin-rich solid fractions obtained after pretreatment and enzymatic hydrolysis,which were then incorporated as an additive into a chitosan-based *** variations in lignin content in the range of approximately 50.6%-66.8%in differently obtained LCNFs gave significantly different optical strengths and mechanical *** controllable processes may allow for customized film ***,the glucose-rich liquid fractions obtained after pretreatment and enzymatic hydrolysis were used as a substrate for ethanol fermentation to achieve total utilization of rice husk biomass *** conclusion,the lignin-rich biomass fraction holds promise as a suitable material for chitosan-LCNF film and has the potential to increase the economic feasibility of the biomaterial industry.

关键词： Rice husk Lignocellulose nanofiber Lignin-based material Chitosan film Upcycling

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Sustained adenosine release:Revealing its impact on osteogenic signalling pathways of human mesenchymal stromal cells

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Engineered Regeneration 2024年第2期5卷 255-268页

作者： Hadi Hajiali Jane McLaren Cristina Gonzalez-García Salah Abdelrazig dong-hyun kim Matthew J.Dalby Manuel Salmerón-Sánchez Felicity R.A.J.Rose School of Pharmacy Nottingham Biodiscovery InstituteUniversity of NottinghamNottinghamUK Healthcare Technologies Institute School of Chemical EngineeringUniversity of BirminghamBirminghamUK Centre for the Cellular Microenvironment University of GlasgowGlasgowUK Centre for Analytical Bioscience Advanced Materials&Healthcare Technologies DivisionSchool of PharmacyUniversity of NottinghamNottinghamUK Marine Microbiomics Program in BiologyDivision of Science and MathematicsNew York University Abu Dhabi(NYUAD)P.O.Box 129188Abu DhabiUnited Arab Emirates

Non-healing fractures,a global health concern arising from trauma,osteoporosis,and tumours,can lead to severe ***,integral to cellular energy metabolism,gains prominence in bone regeneration via adeno-sine A2 B receptor *** study introduces a controlled-release system for localized adenosine delivery,fostering human mesenchymal stromal cell(hMSC)differentiation into functional bone *** study investi-gates how the ratio of lactic acid to glycolic acid in microparticles can influence adenosine release and explores the downstream effects on gene expression and metabolic profiles of osteogenic differentiation in hMSCs cultured in growth and osteoinductive *** into adenosine-modulated signalling pathways during MSC differenti-ation,with osteogenic factors,provide a comprehensive understanding of the pathways *** gene expression and metabolic profiles unravels adenosine’s regulatory mechanisms in MSC *** adenosine release from microparticles induces mineralization,synergizing with osteogenic media supplements,showcasing the potential of adenosine for treating critical bone defects and metabolic *** study high-lights the efficacy of a polymeric microparticle-based delivery system,offering novel strategies for bone *** adenosine’s roles and associated signalling pathways advances our comprehension of molecular mech-anisms steering bone regeneration,propelling innovative biomaterial,combined with metabolites,approaches for clinical use.

关键词： Adenosine release Osteogenic signalling pathways Human mesenchymal stromal cells Bone regeneration

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Triboelectric nanogenerators with gold-thin-film-coated conductive textile as floating electrode for scavenging wind energy

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Nano Research 2018年第1期11卷 101-113页

作者： Bhaskar Dudem dong hyun kim Jae Su Yu Department of Electronic Engineering Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin-si Gyeonggi-do 446-701Republic of Korea

We report triboelectric nanogenerators （TENGs） composed of a flexible and cost-effective gold-coated conductive textile （CT） to convert wind energy into electricity. The Au-coated CT is employed because of its high surface roughness resulting from Au nanodots distributed on microsized fibers. Thus, the Au-coated CT with nano/microarchitecture plays an important role in enhancing the effective contact area as well as the output performance of the TENG. Moreover, the surface roughness of the Au-coated CT is controlled by adjusting the Au thermal deposition time or tailoring the diameter of the Au nanodots. At an applied wind speed of 10 m.s-1, a wind-based TENG （W-TENG） with dimensions of 75 mm × 12 mm ×25 mm produces an open-circuit voltage （Voc） of - 39 V and a short-circuit current （Isc） of - 3 A by using the airflow-induced vibrations of an optimized Au-coated CT between two flat polydimethylsiloxane （PDMS） layers. To further specify the device performance, the electric output of the W-TENG is analyzed by varying several parameters such as the distance between the PDMS layer and Au-coated CT, applied wind speed, external load resistance, and surface roughness of the PDMS layers. Introducing an inverse micropyramid architecture on the PDMS layers further improves the output performance of the W-TENG, which exhibits the highest Voc （- 49 V） and Isc （- 5μA） values at an applied wind speed of 6.8 m.s-1. Additionally, the reliability of the W-TENG is also tested by measuring its output current during long-term cyclic operation. Furthermore, the rectified output signals observed by the W-TENG device are used as a direct power source to light 45 green commercial light-emitting diodes connected in series and also to charge capacitors （100 and 4.7μF）. Finally, the output performance of the W-TENG device in an actual windy situation is also investigated.

关键词： triboelectric nanogenerators Au-coated conductivetextile polydimethylsiloxanelayer wind energy

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Pharmacokinetics and tissue distribution of a novel PDE5 inhibitor,SK-3530,in rats

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Acta Pharmacologica Sinica 2007年第8期28卷 1247-1253页

作者： Hye-hyun YOO Nam-sun kim Guang-jin Im dong-hyun kim Bioanalysis and Biotransformation Research Center Korea Institute of Science & Technology Seoul 136-791Korea Life Science RD Center SK ChemicalsGyeonggi-do 440-300Korea

Aim:To investigate the pharmacokinetic profile and tissue distribution of a novelphosphodiesterase type 5 inhibitor,5-ethyl-2-{5-[4-（2-hydroxy-ethyl）-piperazine-1-sulfonyl]-2-propoxy-phenyl}-7-propyl-3,5-dihydro-pyrrolo（3,2-d）pyrimidin-4-one（SK-3530）,in rats after administration of the14C-labeled ***:The pharmacokinetic parameters of SK-3530 were measured based on the totalradioactivity and parent SK-3530 concentration in rat plasma after intravenousand oral *** tissue distribution of total radioactivity after a singleoral administration of[14C]SK-3530 at a dose of 40 mg/kg was *** protein binding rates of SK-3530 were assessed by in vitro and ex ***:The total radioactivity profiles showed linear *** maximum plasma concentration and area under the curve of the parent SK3530were 10%-20% compared to those of the total *** the oral admin-istration of[14C]SK-3530,the radioactivity was widely distributed in all tissues,and the tissue/plasma ratio of the radioactivity 1 h after administration was calcu-lated as 0.5-2.6 with the exception of excretory organs.A relatively high penetra-tion was shown in the adrenal glands,liver,and *** vitro and ex vivo plasmaprotein binding assay by ultrafiltration showed a considerably high binding rateof more than 97%.Conclusion:SK-3530 was relatively well absorbed in the gas-trointestinal tract and showed linear pharmacokinetics over the investigated ***-3530 had low oral bioavailability due to a high,first-pass metabolism.

关键词： SK-3530 PDE5 inhibitor pharmacokinetics tissue distribution rats

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In situ synthesis of chemically bonded NaTi2（PO4）3/rGO 2D nanocomposite for high-rate sodium-ion batteries

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Nano Research 2016年第6期9卷 1844-1855页

作者： Ha-Kyung Roh hyun-Kyung kim Myeong-Seong kim dong-hyun kim Kyung Yoon Chung Kwang Chul Roh Kwang-Bum kim Department of Material Science & Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seou103722 Republic of Korea Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road Cambridge CB30FS UK Center for Energy Convergence Korea Institute of Science and Technology 5 Hwarang-ro 14-gil Seongbuk-gu Seou102792 Republic of Korea Energy & Environmental Division Korea Institute of Ceramic Engineering & Technology 101 Soho-ro Jinju-si Gyeongsangnam-do 52851 Republic of Korea

A phase-pure NaTi2（PO4）3/reduced graphene oxide （rGO） nanocomposite was prepared using a microwave-assisted one-pot method and subsequent heat treatment. The well-crystallized NaTi2（PO4）3 nanoparticles （30-40 nm） were uniformly precipitated on rGO templates through Ti-O-C bonds. The chemical interactions between the NaTi2（PO4）3 nanoparticles and rGO could immobilize the NaTi2（PO4）3 nanoparticles on the rGO sheets, which might be responsible for the excellent electrochemical performance of the nanocomposite. The NaTi2（PO4）B/rGO nanocomposite exhibited a specific capacity of 128.6 mA-h.g-1 approaching the theoretical value at a 0.1 C-rate with an excellent rate capability （72.9% capacity retention at 50 C-rate） and cycling performance （only 4.5% capacity loss after 1,000 cycles at a high rate of 10 C）. These properties were maintained even when the electrodes were prepared without the use of an additional conducting agent. The excellent sodium storage properties of the NaTi2（PO4）B/rGO nanocomposite could be attributed to the nano-sized NaTi2（PO4）3 particles, which significantly reduced the transport lengths for Na＋ ions, and an intimate contact between the NaTi2（PO4）3 particles and rGO due to chemical bonding.

关键词： NaTi2(PO4)dreducedgraphene oxide (rGO)nanocomposite chemical bonding energy-efficiency in situ synthesis high-rate sodium-ion batteries

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Underwater endoscopic mucosal resection for neoplasms in the pyloric ring of the stomach: Four case reports

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World Journal of Clinical Cases 2020年第14期8卷 3050-3056页

作者： dong hyun kim Seon-Young Park Chang Hwan Park hyun Soo kim Sung Kyu Choi Division of Gastroenterology Department of Internal MedicineChonnam National University Hospital and Medical SchoolGwangju 61469South Korea

BACKGROUND Tumors located in the pylorus are technically more complex to resect by endoscopic resection,as the anatomical characteristics of this region can affect the adequate assessment of margins and performance of the *** reported the results of underwater endoscopic mucosal resection(UEMR)of benign mucosal neoplasms located in the pyloric *** SUMMARY This case series describes 4 patients with 4 mucosal neoplasms located in the pyloric *** diameter of each neoplasm was less than 15 *** performed UEMR for the *** immersion enabled slight floating of the lesions,resulting in easy *** achieved en bloc resection with a snare and electrosurgical *** procedure were performed within 3 min without adverse *** examination showed low-grade dysplasia with clear resection margins in one case and hyperplastic polyps in three *** UEMR can be an effective and safe treatment method for neoplasms in the gastric pyloric ring.

关键词： Duodenoscopy Endoscopic mucosal resection Neoplasm Pylorus Stomach Case report

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Comparative study on discharge conditions in micro-hole electrical discharge machining of tungsten carbide (WC-Co) material

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中国有色金属学会会刊：英文版 2009年第B9期19卷 114-118页

作者： hyun-Seok TAK Chang-Seung HA dong-hyun kim Ho-Jun LEE Hae-June LEE Myung-Chang KANG National Core Research Center for Hybrid Materials Solution Pusan National University Department of Electrical Engineering Pusan National University

WC-Co is used widely in die and mold industries due to its unique combination of hardness, strength and wear-resistance. For machining difficult-to-cut materials, such as tungsten carbide, micro-electrical discharge machining(EDM) is one of the most effective methods for making holes because the hardness is not a dominant parameter in EDM. This paper describes the characteristics of the discharge conditions for micro-hole EDM of tungsten carbide with a WC grain size of 0.5 μm and Co content of 12%. The EDM process was conducted by varying the condenser and resistance values. A R-C discharge EDM device using arc erosion for micro-hole machining was suggested. Furthermore, the characteristics of the developed micro-EDM were analyzed in terms of the electro-optical observation using an oscilloscope and field emission scanning electron microscope.

关键词：电火花加工碳化钨钴难切削材料硬质合金放电扫描电子显微镜微孔模具行业

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Cytomegalovirus colitis induced segmental colonic hypoganglionosis in an immunocompetent patient: A case report

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World Journal of Clinical Cases 2021年第20期9卷 5631-5636页

作者： Ban Seok kim Seon-Young Park dong hyun kim Nah Ihm kim Jae hyun Yoon Jae Kyun Ju Chang Hwan Park hyun Soo kim Sung Kyu Choi Department of Gastroenterology Chonnam National University HospitalGwangju 501-757South Korea Department of Pathology Chonnam National University HospitalGwangju 501-757South Korea Department of Surgery Chonnam University HospitalGwangju 501-757South Korea

BACKGROUND Cytomegalovirus(CMV)colitis is usually seen in immunocompromised patients with risk factors such as human immunodeficiency virus infection,solid organ transplant,inflammatory bowel disease,or ***,many clinicians usually do not consider the possibility of CMV colitis in immunocompetent *** reported a rare case of segmental colonic hypoganglionosis associated with CMV colitis in an immunocompetent *** SUMMARY A 48-year-old woman with no underlying disease was admitted to our hospital for severe abdominal pain and *** tomography of the abdomen showed diffuse dilatation of the small intestine and the entire *** sigmoidoscopic findings and result of polymerase chain reaction(PCR)for CMV revealed the compatible findings of CMV colitis,the patient was treated with intravenous *** treatment,sigmoidoscopic findings and CMV PCR results *** the patient continued to suffered from *** months after the initial admission,patient visited the emergency department with severe abdominal pain and imaging revealed aggravation of fecal impaction and bowel *** performed subtotal colectomy to control patient’s *** examination of the resected specimen showed significantly reduced number of mature ganglion cells in the sigmoid colon compared to that in the proximal *** Our case demonstrates that CMV colitis can develop even in patients with no other underlying disease,and that CMV colitis can be one of the causes for developing colonic hypoganglionosis.

关键词： Colonic pseudo-obstruction Colitis Cytomegalovirus Ganglia Case report

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Asymmetric dynamic behaviors of magnetic domain wall in trapezoid-cross-section nanostrip

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Chinese Physics B 2020年第9期29卷 518-522页

作者： Xiao-Ping Ma Hong-Guang Piao Lei Yang dong-hyun kim Chun-Yeol You Liqing Pan Research Institute for Magnetoelectric&Weak Magnetic-field Detection College of ScienceChina Three Gorges UniversityYichang 443002China Department of Physics Chungbuk National UniversityCheongju 28644ChungbukRepublic of Korea Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea

Field-driven magnetic domain wall propagation in ferromagnetic nanostrips with trapezoidal cross section has been systematically investigated by means of micromagnetic simulation. Asymmetric dynamic behaviors of domain wall, depending on the propagation direction, were observed under an external magnetic field. When the domain walls propagate in the opposite direction along the long axis of the nanostrip, the Walker breakdown fields as well as the average velocities are different. The asymmetric landscape of demagnetization energies, which arises from the trapezoidal geometry, is the main origin of the asymmetric propagation behavior. Furthermore, a trapezoid-cross-section nanostrip will become a nanotube if it is rolled artificially along its long axis, and thus a two-dimensional transverse domain wall will become a three-dimensional one. Interestingly, it is found that the asymmetric behaviors observed in two-dimensional nanostrips with trapezoidal cross section are similar with some dynamic properties occurring in three-dimensional nanotubes.

关键词： ferromagnetic nanowire magnetic domain wall geometric effect asymmetric Walker breakdown

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