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Hydrogen-based direct reduction of iron oxide at 700℃:Heterogeneity at pellet and microstructure scales

international Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1901-1907页

作者： Yan Ma isnaldi R.Souza Filho Xue Zhang Supriya Nandy Pere Barriobero-vila guillermo Requena dirk Vogel Michael Rohwerder dirk Ponge Hauke Springer dierk Raabe Max-Planck-institut für Eisenforschung Max-Planck-Straße 140237 DüsseldorfGermany Corrosion Center Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China institute of Materials Research German Aerospace Center(DLR)Linder Höhe51147 CologneGermany Lehr-und Forschungsgebiet Metallische Strukturen und Werkstoffsysteme für die Luft-und Raumfahrt RWTH Aachen University52062 AachenGermany institut für Bildsame Formgebung RWTH Aachen UniversityIntzestraße 1052072 AachenGermany

Steel production causes a third of all industrial CO_(2) emissions due to the use of carbon-based substances as reductants for iron ores,making it a key driver of global ***,research efforts aim to replace these reductants with sustainably produced ***-based direct reduction(HydR)is an attractive processing technology,given that direct reduction(dR)furnaces are routinely operated in the steel industry but with CH_(4) or CO as *** diffuses considerably faster through shaft-furnace pellet agglomerates than carbon-based ***,the net reduction kinetics in HydR remains extremely sluggish for high-quantity steel production,and the hydrogen consumption exceeds the stoichiometrically required amount ***,the present study focused on the improved understanding of the influence of spatial gradients,morphology,and internal microstructures of ore pellets on reduction efficiency and metallization during *** this purpose,commercial dR pellets were investigated using synchrotron high-energy X-ray diffraction and electron microscopy in conjunction with electron backscatter diffraction and chemical *** the interplay of different phases with internal interfaces,free surfaces,and associated nucleation and growth mechanisms provides a basis for developing tailored ore pellets that are highly suited for a fast and efficient HydR.

关键词： hydrogen-based direct reduction iron oxide microstructure spatial gradient metallization

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Synthesis, Crystal Structure and Biological Evaluation of 6'-Chloro-4'-methylene-3H-spiro[isobenzofuran-1,3'-isochroman]

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Chinese Journal of Structural Chemistry 2019年第1期38卷 89-94,3页

作者： pu Xiu-Ying XU Wen-Jun Yi Yun-Peng Li Hao-Wen LiANg Jian-Ping HAO Bao-Cheng School of Life Science and Engineering Lanzhou University of Technology Key Laboratory of New Animal drug Project of gansu Province Key Laboratory of Veterinary Pharmaceutical Development Ministry of AgricultureInstitute of Husbandry and Pharmaceutical Sciences of CAAS

The title compound 6?-chloro-4?-methylene-3 H-spiro [isoben zofura-1,3?-isochroman], C_(17)H_(13)ClO_2, was prepared and characterized by iR, NMR, HRMS and single-crystal X-ray diffraction. This compound has a bisbenzannulated [5,5]-spiroketals skeleton. it crystallizes in orthorhombic, space group P212121 with a = 13.383(3), b = 7.6120(17), c = 13.793(3) ?, Z = 4, dc= 1.275 g/cm^3, μ = 0.28 mm^(–1), F(000) = 592, wR = 0.1443 and R = 0.0557. The preliminary biological test showed that the title compound has good anti-bacterial activities in vitro.

关键词： 3H-spiro[isobenzofura-1,3'-isochroman] single-crystal structure anti-bacterial

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Novel compound heterozygous mutations in dNAH1 cause primary infertility in Han Chinese males with multiple morphological abnormalities of the sperm flagella

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Asian Journal of Andrology 2023年第4期25卷 512-519页

作者： Meng Wang Qi-Yu Yang Jue-pu Zhou Hui-Ping Tan Juan Hu Lei Jin Li-Xia Zhu Reproductive Medicine Center Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

This study aimed to identify genetic causes responsible for multiple morphological abnormalities of the sperm flagella(MMAF)in the Han Chinese *** primary infertile males with completely immobile sperm and MMAF were ***-exome sequencing and Sanger sequencing were performed to identify disease-causing ***,morphological and ultrastructural analyses of sperm flagella were *** probable impact of genetic variants on protein function was analyzed by online bioinformatic tools and immunofluorescence *** patients with dynein axonemal heavy chain 1(dNAH1)gene compound heterozygous variations were ***1 c.7435C>T,p.R2479X and c.10757T>C,p.F3586S were identified in the patient from Family 1,c.11726_11727delCT,p.P3909fs and c.12154delC,p.L4052fs were found in the patient from Family 2,and c.10627-3C>g and c.11726_11727delCT,p.P3909fs existed in the patient from Family *** of these variations have not been reported,and all the mutations showed pathogenicity by functional effect *** absence of the center pair and disorganization of the fibrous sheath were present in sperm flagella at the ultrastructural ***,the expression of dNAH1 was absent in spermatozoa from the participants,validating the pathogenicity of the *** three couples have undergone intracytoplasmic sperm injection(iCSi),and two couples of them became pregnant after the *** conclusion,the newly identified dNAH1 mutations can expand the mutational and phenotypic spectrum of MMAF genes and provide a theoretical basis for genetic diagnosis in MMAF *** is recommended to conduct genetic screening in male infertility patients with MMAF and provide rational genetic counseling,and iCSi might be an optimal strategy to help with fertilization and conception for patients with dNAH1 mutations.

关键词： dNAH1 intracytoplasmic sperm injection male infertility MMAF mutation

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Natural variability of essential oil and antioxidants in the medicinal plant Turnera diffusa

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Asian Pacific Journal of Tropical Medicine 2017年第2期10卷 114-119页

作者： Ana Lucía Urbizu-gonzález Octelina Castillo-Ruiz guillermo Cristian guadalupe Martínez-Ávila Jorge Ariel Torres-Castillo Universidad Autónoma de Tamaulipas Instituto de Ecología AplicadaDivisión del Golfo 356Col.Libertad87019Ciudad VictoriaTamaulipasMéxico Universidad Autónoma de Tamaulipas Unidad Académica Multidisciplinaria Reynosa AztlánCalle 16 y Lago de Chápala s/n Col.AztlánC.P.88740ReynosaTamaulipasMéxico Universidad Autónoma de Nuevo León Facultad de AgronomíaFrancisco Villa s/n.Col.Ex Hacienda El Canadá66050General EscobedoNuevo LeónMéxico

Objective:To evaluate differences in yield and composition of the essential oil and antioxidant contents in *** plants from localities in central region of ***:Samples were collected in Tamaulipas,Mexico in the arid *** oil was obtained through steam distillation and analyzed using *** contents,antioxidant activities using ABTS and ferric reducing antioxidant power(FRAP) methods also were ***:A total of 21 compunds were identified in the essential oils;nevertheless,only Eucalyptol,1,4-Methanocycloocta[d]pyridazine,1,4,4a,5,6,9,10,10a-octahydro-11,11-dimethyl-,(1à,4à,4aà,10aà) y Ethanone,1-(1,3-dimethyl-3-cyclohexen-1-yl) were detected in the three *** contents were registered in the sample from Padrón y Juárez with phenolic content of 33.85 mg gAE/g of dry material and antioxidant activities with ABTS 72.32% and with FRAP 21.33 mg gAE/g of dry *** differences were observed in essential oil,phenolics and antioxidants contents between ***:Results suggest that climatic differences and origin influence the phytochemicals in the medicinal plant ***,and thus,it is worth to consider such effects for industrial and medicinal purposes.

关键词： Essential oil Antioxidants Phytochemicals Chemical variation

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Near-infrared Fluorescence imaging Contrast Agents for Clinical Research: Limitations and Alternatives

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Open Journal of Biophysics 2024年第1期14卷 73-77页

作者： Serigne Moussa Badiane Elhadji A. L. Bathily Fawrou Seye Louis A.d. diouf department of Health Sciences Gaston BERGER University Saint-Louis Senegal department of Health Sciences Cheikh Anta DIOP University Dakar Senegal Cell Biology and Histology Health Sciences Department Gaston BERGER University Saint-Louis Senegal

introduction: Near-infrared fluorescence imaging is a technique that will establish itself in the short term at the international level because it is recognized for its potential to improve the performance of surgical interventions, its moderate investment and operating costs and its portability. Although the technology is now mature, there is currently the problem of the availability of contrast agents to be injected iV. The aim of this methodology article is to propose an alternative solution to the need for contrast agents for clinical research, particularly in oncology. Methodology: They consist of coupling a fluorescent marker in the form of an NHS derivative, such as iR dYE manufactured in compliance with gMP, with therapeutic monoclonal antibodies having marketing authorization for molecular imaging. For a given antibody, the marking procedure must be the subject of a validation file on the final preparation filtered on a sterilizing membrane at 0.22 μm. Once the procedure has been validated, it would be unnecessary to repeat the tests before each clinical research examination. A check of the marking by thin-layer chromatography (TLC) and place it in a sample bank at +4˚C for 1 month of each injected formulation would be sufficient for additional tests if necessary. Conclusion: Molecular near-infrared fluorescence imaging is experiencing development, the process of which could be accelerated by greater availability of clinical contrast agents. Alternative solutions are therefore necessary to promote clinical research in this area. These methods must be shared to make it easier for researchers.

关键词： Fluorescence imaging Contrast Agents Clinical Research

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Microbial Activity and Culturable Bacterial diversity in Sediments of the great Rann of Kachchh,Western india

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Pedosphere 2014年第1期24卷 45-55页

作者： g.SUBRAHMANYAM N.KHONdE d.M.MAURYA L.S.CHAMYAL g.ARCHANA department of Microbiology and Biotechnology Centre Faculty of ScienceThe Maharaja Sayajirao University of Baroda department of geology Faculty of ScienceThe Maharaja Sayajirao University of Baroda

The great Rann of Kachchh, a vast expanse of salt desert in Western india is a unique hostile ecosystem posing an extreme environment to life forms due to high salt content, hyper-axid climate, seasonal water logging and extremes of temperature. in the virtual absence of natural vegetation, soils and sediments of Rann of Kachchh axe microbially dominated ecosystems. in the present study microbial activity and the diversity of cultivated heterotrophic bacteria were investigated in the sediments collected along a 5-m exposed section at Khadir island in the great Rann of Kachchh. Microbial activity （as an index of sediment enzymes） was found to be high in the middle of the section （200-280 cm）. dehydrogenase （dHA）, substrate-induced dHA and alkaline phosphatase activities revealed the oligotrophic nature of the basal portion （320-480 cm）. Abundant bacterial isolates obtained from different depths were found to be clustered in 12 different phylogenetic groups by amplified ribosomal dNA restriction analysis. 16S rRNA gene sequencing revealed the dominant bacterial ribotypes to be affiliated to Firmicutes （Families Bacillaceae and Staphyloeoccaeeae） and Aetinobaeteria （Family Brevibaeteriaceae） with minor contribution of Proteobacteria （Families Phyllobacteriaeeae and Bartonellaceae）, pointing their endurance and adaptability to environmental stresses. Statistical analysis indicated that sediment organic carbon, salinity, total available nitrogen and total available phosphorous are most likely critical determinants of microbial activity in the Khadir island sediments.

关键词： amplified ribosomal dNA restriction analysis enzymes extreme environment heterotrophic bacteria 16S rRNA gene sequencing

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Fibre Optic Protection System for Concrete Structures

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Journal of Materials Science & Technology 2006年第3期22卷 404-410页

作者： J.S.Leng A.Hameed d.Winter R.A.Barnes g.C.Mays g.F.Fernando Centre for Composite Materials Harbin institute of Technology Harbin 150001 China Engineering System department defence Academy of the United Kingdom Cranfield University Shrivenham Wiltshire SN6 8LA UK

The design concepts, modelling and implementation of various fibre optic sensor protection systems for development in concrete structures were investigated. design concepts and on-site requirements for surface-mounted and embedded optical fibre sensor in concrete were addressed. Finite element （FE） modelling of selected sensor protection systems in strain-transfer efficiency from the structure to the sensing region was also studied. And experimental validation of specified sensor protection system was reported. Results obtained indicate that the protection system for the sensors performs adequately in concrete environment and there is very good correlation between results obtained by the protected fibre optic sensors and conventional electrical resistance strain gauges.

关键词： Fibre optic sensor (FOS) Sensor protection system (SPS) Concrete structures Extrinsic Fabry-Perot interferometer (EFPi) sensor Smart Structures Strain transfer

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Self-focusing of UV radiation in 1mmscale plasma in a deep ablative crater produced by 100ns,1 gW KrF laser pulse in the context of iCF

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Matter and Radiation at Extremes 2020年第3期5卷 11-19页

作者： V.d.Zvorykin i.g.Lebo A.V.Shutov N.N.Ustinovskii Lebedev Physical institute of RAS 53 Leninskiy Pr.Moscow 119991Russian Federation MiREA-Russian Technological University Institute of Cybernetics78 Vernadskogo Pr.Moscow 119454Russian Federation

Experiments at the gARpuN KrF laser facility and 2d simulations using the NUTCY code were performed to study the irradiation of metal and polymethyl methacrylate(PMMA)targets by 100 nsUVpulses at intensities up to 5×10^(12)Wcm^(−2).in both targets,a deep crater of length 1mm was produced owing to the 2d geometry of the supersonic propagation of the ablation front in condensed matter that was pushed sideways by a conical shock ***-scale filamentation of the laser beam caused by thermal self-focusing of radiation in the crater-confined plasma was evidenced by the presence of a microcrater relief on the bottom of the main *** translucent PMMA,with a penetration depth forUVlight of several hundred micrometers,a long narrow channel of length 1mmand diameter 30μmwas observed emerging from the crater *** channels with a length-to-diameter aspect ratio of∼1000 were produced by a repeated-pulse KrF laser in PMMA and fused silica glass at an intensity of∼10^(9)Wcm^(−2).This channel formation is attributed to the effects of radiation self-focusing in the plasma and Kerr self-focusing in a partially transparent target material after shallow-angle reflection by the crater *** modeling of the initial stage of inertial confinement fusion-scale direct-drive KrF laser interaction with subcritical coronal plasmas from spherical and cone-type targets using craterconfined plasmas seems to be feasible with increased laser intensity above 10^(14) W cm^(−2).

关键词： KrF pulse transparent

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石朴作品

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中国书画 2024年第1期 135-135页

作者：石朴不详

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CeO_(2)/PTFE涂层微粗糙结构的构筑及其超疏水性能

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陕西科技大学学报 2024年第3期42卷 119-124页

作者：许宁林雨雒玉欣马家辉杨翘宇王卓蒲永平丁旭东陕西科技大学材料科学与工程学院陕西西安710021 浙江墙煌新材料有限公司浙江绍兴312000

采用熔盐法制备呈八面体状、粒径尺寸分布在300~500 nm的CeO_(2)颗粒,借助喷涂法制备CeO_(2)/PTFE涂层,目的是通过CeO_(2)颗粒的加入填充或者嵌入在PTFE的网络结构上,以此构筑CeO_(2)/PTFE涂层微粗糙结构提高其疏水性能.探讨不同的CeO_... 详细信息

采用熔盐法制备呈八面体状、粒径尺寸分布在300~500 nm的CeO_(2)颗粒,借助喷涂法制备CeO_(2)/PTFE涂层,目的是通过CeO_(2)颗粒的加入填充或者嵌入在PTFE的网络结构上,以此构筑CeO_(2)/PTFE涂层微粗糙结构提高其疏水性能.探讨不同的CeO_(2)颗粒含量在不同硬度铝基底上(Al 3003和Al 3004)对CeO_(2)/PTFE涂层疏水性能的影响,进而从“CeO_(2)颗粒的显微结构”和“微粗糙结构的构筑”两个方面阐明CeO_(2)/PTFE涂层的超疏水机理.结果表明:当CeO_(2)颗粒含量为0.5 wt%时,从SEM图中看出CeO_(2)/PTFE涂层的表面出现大量突起且呈现密集均匀排布即构筑出“单层连续网络结构”;CeO_(2)颗粒嵌入PTFE涂层的网络结构中CeO_(2)/PTFE涂层疏水性能最佳,从润湿性分析得到在Al 3003和Al 3004接触角分别为154.7°和153.3°.当CeO_(2)颗粒含量小于0.5 wt%时,构筑涂层表面呈现“孤岛状结构”;大于0.5 wt%时,构筑涂层表面呈现“多层不连续网络结构”.

关键词： CeO_(2) 微粗糙结构复合涂层疏水性

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