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A novel method for determining the resistivity of compressed superconducting materials

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Matter and Radiation at Extremes 2024年第4期9卷 1-3页

作者： Liling Sun Qi Wu Shu Cai Yang Ding ho-kwang Mao Center for High Pressure Science and Technology Advanced Research Beijing 100094China Institute of Physics Chinese Academy of SciencesBeijing 100190China

The measurement of resistivity in a compressed material within a diamond anvil cell presents significant *** high-pressure exper-imental setup makes it difficult to directly measure the size changes induced by pressure in the three crystallographic directions of the *** this study,we introduce a novel and effective method that addresses these technical *** method is anticipated to offer a valuable foundation for high-pressure investigations on quantum materials,particularly those with anisotropic layered structures.

关键词： resistivity method foundation

Heating energy performance and part load ratio characteristics of boiler staging in an office building

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Frontiers in Energy 2019年第2期13卷 339-353页

作者： Da Young lee Byeong Mo SEO Yeo Beom YOON Sung Hyup hoNG Jong Min ChoI kwang ho lee Graduate School Hanbat National UniversityDaejeon 305-719South Korea College of Design North Carolina State University RaleighNC 27695-7701USA Department of Mechanical Engineering Hanbat National UniversityDaejeon 305-719South Korea Department of Architectural Engineering Hanbat National UniversityDaejeon 305-719South Korea

Commercial buildings account for significant portions of the total building energy in South Korea and thus a variety of research on the boiler operation related to heating energy in office buildings has been carried out thus far. however, most of the researches have been conducted on the boiler itself, i.e., the part load ratio characteristics and the corresponding gas energy consumption patterns are not analyzed in the existing studies. In this study, the part load ratio and the operating characteristics of gas boiler have been analyzed within an office building equipped with the conventional variable air volume system. In addition, the gas consumption among different boiler staging schemes has been comparatively analyzed. As a result, significant portions of total operating hours, heating load and energy consumption has been found to be in a part load ratio range of 0 through 40% and thus energy consumption is significantly affected by boiler efficiency at low part load conditions. This suggests that boiler operation at the part load is an important factor in commercial buildings. In addition, utilizing sequential boiler staging scheme can save a gas usage of about 7%. For annual heating energy saving, applying the sequential control boiler with a 3:7 proportion staging is considered to be the optimal control algorithm for maximum efficiency of boilers.

关键词： EnergyPlus boiler part load ratio gas con-sumption office building boiler staging

N4-methylcytidine ribosomal RNA methylation in chloroplasts is crucial for chloroplast function,development,and abscisic acid response in Arabidopsis

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Journal of Integrative Plant Biology 2021年第3期63卷 570-582页

作者： Le Nguyen Tieu Ngoc Su Jung Park Trinh Thi Huong kwang ho lee Hunseung Kang Department of Applied Biology College of Agriculture and Life SciencesChonnam National UniversityGwangju 61186Republic of Korea Faculty of Forestry Agriculture Tay Nguyen UniversityBuonMaThuotDakLak63000Vietnam Center for Research Facilities Chonnam National UniversityGwangju 61186Republic of Korea

Although the essential role of messenger RNA methylation in the nucleus is increasingly understood,the nature of ribosomal RNA(rRNA)methyltransferases and the role of rRNA methylation in chloroplasts remain largely unknown.A recent study revealed that CMAL(for Chloroplast mraW-Like)is a chloroplast-localized rRNA methyltransferase that is responsible for N4-methylcytidine(m^(4)C)in 16S chloroplast rRNA in Arabidopsis *** this study,we further examined the role of CMAL in chloroplast biogenesis and function,development,and hormone *** cmal mutant showed reduced chlorophyll biosynthesis,photosynthetic activity,and growth-defect phenotypes,including severely stunted stems,fewer siliques,and lower seed *** cmal mutant was hypersensitive to chloroplast translation inhibitors,such as lincomycin and erythromycin,indicating that the m^(4)C methylation defect in the 16S rRNA leads to a reduced translational activity in ***,the stunted stem of the cmal mutant was partially rescued by exogenous gibberellic acid or *** cmal mutant grew poorer than wild type,whereas the CMAL-overexpressing transgenic Arabidopsis plants grew better than wild type in the presence of abscisic ***,these results indicate that CMAL is an indispensable rRNA methyltransferase in chloroplasts and is crucial for chloroplast biogenesis and function,photosynthesis,and hormone response during plant growth and development.

关键词： abiotic stress Arabidopsis chloroplast CMAL RNA methylation rRNA methylation

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Unveiling a novel metal-to-metal transition in LuH_(2):Critically challenging superconductivity claims in lutetium hydrides

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Matter and Radiation at Extremes 2024年第3期9卷 65-73页

作者： Dong Wang Ningning Wang Caoshun Zhang Chunsheng Xia Weicheng Guo Xia Yin Kejun Bu Takeshi Nakagawa Jianbo Zhang Federico Gorelli Philip Dalladay-Simpson Thomas Meier Xujie Lü Liling Sun Jinguang Cheng Qiaoshi Zeng Yang Ding ho-kwang Mao Center for High-Pressure Science and Technology Advanced Research Beijing 100094China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)Shanghai 201203China

Following the recent report by Dasenbrock-Gammon et al.[Nature 615,244–250(2023)]of near-ambient superconductivity in nitrogendoped lutetium trihydride(LuH_(3-δ)N_(ε)),significant debate has emerged surrounding the composition and interpretation of the observed sharp resistance ***,we meticulously revisit these claims through comprehensive characterization and *** definitively identify the reported material as lutetium dihydride(LuH_(2)),resolving the ambiguity surrounding its *** similar conditions(270–295 K and 1–2 GPa),we replicate the reported sharp decrease in electrical resistance with a 30%success rate,aligning with the observations by Dasenbrock-Gammon et ***,our extensive investigations reveal this phenomenon to be a novel pressure-induced metal-to-metal transition intrinsic to LuH_(2),distinct from ***,nitrogen doping exerts minimal impact on this *** work not only elucidates the fundamental properties of LuH_(2)andLuH_(3),but also critically challenges the notion of superconductivity in these lutetium hydride *** findings pave the way for future research on lutetium hydride systems,while emphasizing the crucial importance of rigorous verification in claims of ambient-temperature superconductivity.

关键词： resistance hydride superconductivity

Changes in microorganisms and metabolites during long-term fermentation of commercially manufactured anchovy sauce

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Food Science and Human Wellness 2024年

作者： Daehyeon Kim Seong-Eun Park Eun-Ju Kim Seung-ho Seo kwang-Moon Cho Sun Jae Kwon hong-Seok Son Department of Biotechnology， College of Life Sciences and Biotechnology， Korea University Sonlab Inc. 3. AccuGene Inc.

This study was performed to investigate the changes in microbial communities and metabolites during the long-term fermentation of commercially manufactured anchovy sauce. Samples of commercial anchovy sauce were collected from large-scale fermentation tanks with fermentation periods of up to 7.87 years. The complex bacterial community was simplified to two genera， Tetragenococcus and Halanaerobium， after approximately 0.55 years of fermentation. Although genera， such as Saccharomyces， Cladosporium， Candida， and Aspergillus， were relatively dominant， no clear pattern was identified in fungal community analysis. The longitudinal metabolite profile demonstrated that approximately half (55.8%) of the metabolites present in anchovy sauce were produced within a year of fermentation due to rapid fermentation. Despite the static microbial community， the contents of several metabolites including amino acids and biogenic amines changed continuously during the long-term fermentation of anchovy sauce. This study provides novel insights into the changes in microbiota and metabolites in fish sauce produced without any starter inoculation.

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调制周期对AlCrSiN/AlCrMoSiN多层膜微结构和性能的影响

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表面技术 2024年第15期53卷 57-67页

作者：王重阳刘艳梅阎兵朱建博薛锐徐远剑 Kim kwang ho 王铁钢天津职业技术师范大学天津市高速切削与精密加工重点实验室天津300222 天津天海同步科技有限公司天津301600 天津亚盛工业技术有限公司天津300200 Global Frontier R&D Center for Hybrid Interface Materials Pusan National UniversityBusan 609-735The Republic of Korea

目的通过优化AlCrSiN/AlCrMoSiN多层复合涂层的调制周期,提升涂层的力学性能和摩擦学性能。方法采用高功率脉冲磁控溅射与脉冲直流磁控溅射复合技术,固定调制比为5∶1,制备具有不同调制周期的AlCrSiN/AlCrMoSiN多层复合涂层。利用XRD和... 详细信息

目的通过优化AlCrSiN/AlCrMoSiN多层复合涂层的调制周期,提升涂层的力学性能和摩擦学性能。方法采用高功率脉冲磁控溅射与脉冲直流磁控溅射复合技术,固定调制比为5∶1,制备具有不同调制周期的AlCrSiN/AlCrMoSiN多层复合涂层。利用XRD和SEM分析涂层物相组成,观察其微观形貌;借助纳米压痕仪、划痕仪、高温摩擦试验机及轮廓仪测试涂层的硬度、弹性模量、临界载荷,以及摩擦磨损性能。结果掺杂Mo元素后,AlCrMoSiN层生成了大量的非晶相,并观察到沿AlN(111)晶面共格外延生长。AlCrSiN/AlCrMoSiN多层复合涂层表面颗粒随着调制周期的增大逐渐变小,整体呈“花椰菜”状,且致密、无缺陷。随着调制周期的增大,硬度、H/E和H^(3)/E^(*2)呈先升高后降低的趋势;涂层的平均摩擦因数呈先降低后升高的趋势。当调制周期为145 nm(AlCrSiN层厚度约为120 nm,AlCrMoSiN层厚度约为25 nm)时,多层涂层中层间界面清晰,涂层的硬度最高,约为24.9GPa,摩擦因数和磨损率均最低,分别为0.57、1.46×10^(-6)mm^(3)/(N·m),临界载荷为75.8N。结论多层复合涂层的调制周期对其结构和性能具有重要影响,当调制周期为145nm时,AlCrSiN/AlCrMoSiN多层复合涂层具有最佳的综合性能。

关键词：磁控溅射多层复合涂层 AlCrSiN/AlCrMoSiN 调制周期摩擦学行为

Predictive factors for interferon and ribavirin combination therapy in patients with chronic hepatitis C

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World Journal of Gastroenterology 2007年第46期13卷 6236-6242页

作者： Joonho Yoon Jong In lee Soon Koo Baik kwang ho lee Joon Hyung Sohn Hyean-Woo lee Jun Namkung Sei Jin Chang Jong-Whan Choi Hyun-Won Kim Byung-Il Yeh Department of Biochemistry and Institute of Basic Medical Sciences Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Internal Medicine Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Internal Medicine Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Institute of Lifelong HealthWonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Anesthesiology Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Biochemistry and Institute of Basic Medical Sciences Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Institute of Lifelong HealthWonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Department of Preventive Medicine and Institute of Occupational Medicine Wonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea Institute of Lifelong HealthWonju College of MedicineYonsei UniversityWonju 220-701Republic of Korea

瞄准：为干扰素(IFN ) 证实预兆的因素为有丙肝的长期的肝炎病人的 -alpha 和 ribavirin 联合治疗病毒(HCV ) 遗传型 1b。方法：从感染 HCV 遗传型 1b 的 50 个病人的 HCV RNA 被决定区域(ISDR ) 的干扰素敏感克隆并且定序学习， PKR-eI... 详细信息

瞄准：为干扰素(IFN ) 证实预兆的因素为有丙肝的长期的肝炎病人的 -alpha 和 ribavirin 联合治疗病毒(HCV ) 遗传型 1b。方法：从感染 HCV 遗传型 1b 的 50 个病人的 HCV RNA 被决定区域(ISDR ) 的干扰素敏感克隆并且定序学习， PKR-eIF2alpha 磷酸化相同领域(PePHD ) 。病人们为 6 瞬间与 IFN-alpha 和 ribavirin 被对待并且由治疗的有效性组织了。许多因素被分析。结果：我们的数据证明年龄， HCV RNA 效价，和 ISDR 类型能为联合 IFN-alpha 和 ribavirin 功效被用作预兆的因素。表示特性地，仅仅当联合治疗是有效的时，在 PePHD 的变化出现了。另外的因素，例如性别和丙氨酸， aminotransferase (中高音) 铺平，不与它的功效有关。好久调整并且 HCV RNA titer 显示 ISDR 类型是最有势力预兆的因素。结论：HCV RNA ISDR 类型是为在朝鲜病人预言 IFN-alpha 和 ribavirin 联合治疗的功效的一个重要因素。

关键词：丙肝病毒干扰素病毒唑磷酸化

Harnessing chemical pressure

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National Science Review 2023年第12期10卷 45-47页

作者： ho-kwang Mao Shanghai Advanced Research in Physical Sciences(SHARPS)

Pressure profoundly changes all physical characteristics of a condensed matter and provides a vast and fertile dimension to search for materials with extremely favorable properties for technological applications [1,2]. however, these favorable properties are only optimally tuned at a specific high pressure and will vanish or revert at the ambient pressure, rendering them merely of academic interest.

关键词： SUPERCONDUCTIVITY CU HYDRIDE

Triggering dynamics of acetylene topochemical polymerization

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Matter and Radiation at Extremes 2023年第5期8卷 82-88页

作者： Xingyu Tang Xiao Dong Chunfang Zhang Kuo Li Haiyan Zheng ho-kwang Mao Center for High Pressure Science and Technology Advanced Research Beijing 100193People’s Republic of China Key Laboratory of Weak-Light Nonlinear Photonics School of PhysicsNankai UniversityTianjin 300071People’s Republic of China College of Chemistry and Materials Science Hebei UniversityBaoding 071002People’s Republic of China

Topochemical reactions are a promising method to obtain crystalline polymeric materials with distance-determined regio-or *** has been concluded on an empirical basis that the closest intermolecular C⋅⋅⋅C distance in crystals of alkynes,d(C⋅⋅⋅C)min,should reach a threshold of∼3Åfor bonding to occur at room *** understand this empirical threshold,we study here the polymerization of acetylene in the crystalline state under high pressure by calculating the structural geometry,vibrational modes,and reaction *** find d(C⋅⋅⋅C)min to be the sum of an intrinsic threshold of 2.3Åand a thermal displacement of 0.8Å(at room temperature).Molecules at the empirical threshold move via several phonon modes to reach the intrinsic threshold,at which the intermolecular electronic interaction is sharply enhanced and bonding commences.A distance–vibration-based reaction picture is thus demonstrated,which provides a basis for the prediction and design of topochemical reactions,as well as an enhanced understanding of the bonding process in solids.

关键词： temperature bonding polymerization