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Effect of isothermal temper embrittlement and subsequent hydrogen embrittlement on tensile properties of 2.25Cr-1Mo-0.25V base metal and welded metal

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Journal of Iron and Steel Research International 2021年第11期28卷 1426-1438页

作者： Zhi-peng Shen Wei Fu Ling-rui Kong Han-han Ma Xiao-hua He Xiao-chun Yu chang-yu zhou School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816JiangsuChina Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment Nanjing 211816JiangsuChina

2.25Cr–1Mo–0.25V base metal(BM)and welded metal(WM)with different temper embrittlement states were obtained by isothermal temper embrittlement *** ductile–brittle transition temperature and the carbide size of temper embrittled 2.25Cr–1Mo–0.25V BM and WM increased with the isothermal tempering *** increase in temper embrittlement time leads to a decrease in yield strength(YS)and ultimate tensile strength(UTS).Hydrogen embrittlement(HE)can decrease the ductility and increase YS and UTS of the *** hydrogen embrittlement sensitivity and microstructure analysis both show a combined effect of HE and temper *** deeper the temper embrittlement,the more sensitive the material to *** the hydrogen content in the material is low,the WM is less susceptible to HE due to its welding defects.

关键词： 2.25Cr–1Mo–0.25V base metal Temper embrittlement Hydrogen embrittlement Mechanical property Combined effect

白腐菌改性黄芪药渣吸附脱色模拟染料废水的研究

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化学工程师 2024年第8期38卷 44-47页

作者：刘明源杲雨婷周琳高君宇泰州职业技术学院药学院江苏泰州225300

本文用白腐真菌发酵改性黄芪药渣,制备得到具有对亚甲基蓝模拟染料废水有较好吸附效果的吸附剂,并研究了初始pH值、吸附反应温度、吸附剂加入量、吸附时长对亚甲基蓝吸附效果的影响。实验结果表明,在溶液初始pH值为6~8、吸附温度为30℃... 详细信息

本文用白腐真菌发酵改性黄芪药渣,制备得到具有对亚甲基蓝模拟染料废水有较好吸附效果的吸附剂,并研究了初始pH值、吸附反应温度、吸附剂加入量、吸附时长对亚甲基蓝吸附效果的影响。实验结果表明,在溶液初始pH值为6~8、吸附温度为30℃、改性黄芪药渣加入量为0.1g、吸附时长为4h的条件下,改性黄芪药渣对亚甲基蓝的吸附率可达91.03%。

关键词：白腐菌黄芪药渣生物改性亚甲基蓝吸附

An innovative membrane bioreactor and packed-bed biofilm reactor combined system for shortcut nitrification-denitrification

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Journal of Environmental Sciences 2009年第5期21卷 568-574页

作者： ZHANG Yunxia, zhou Jiti, ZHANG Jinsong, yuan Shouzhi School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China. School of Environmental and Biological Science and Technology Dalian University of Technology

An innovative shortcut biological nitrogen removal system, consisting of an aerobic submerged membrane bioreactor （MBR） and an anaerobic packed-bed biofilm reactor （PBBR）, was evaluated for treating high strength ammonium-bearing wastewater. The system was seeded with enriched ammonia-oxidizing bacteria （AOB） and operated without sludge purge with a decreased hydraulic retention time （HRT） through three phases. MBR was successful in both maintaining nitrite ratio over 0.95 and nitrification efficiency higher than 98% at HRT of 24 h, and PBBR showed satisfactory denitrification efficiency with very low effluent nitrite and nitrate concentration （both below 3 mg/L）. By examining the nitrification activity of microorganism, it was found that the specifc ammonium oxidization rate （SAOR） increased from 0.17 to 0.51 g N/（g VSS.d） and then decreased to 0.22 g N/（g VSS.d） at the last phase, which resulted from the accumulation of extracellular polymers substances （EPS） and inert matters enwrapping around the zoogloea. In contrast, the average specific nitrite oxidization rate （SNOR） is 0.002 g N/（g VSS.d）, only 1% of SAOR. Because very little Nitrobactor has been detected by fluorescence in situ hybridization （FISH）, it is confirmed that the stability of high nitrite accumulation in MBR is caused by a large amount of AOB.

关键词： shortcut nitrification-denitrification ammonia-oxidizing bacteria nitrite accumulation FISH

New insights into multiple provenances evolution of the Jurassic from heavy minerals characteristics in southern Junggar Basin, NW China

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Petroleum Exploration and Development 2019年第1期46卷 67-81页

作者： zhou Tianqi WU Chaodong yuan Bo SHI Zhongkui WANG Jialin ZHU Wen zhou Yanxi JIANG Xi ZHAO Jinyong WANG Jun MA Jian Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Institute of Oil and Gas Peking University Geophysics Department in Exploration and Development Institution of Xinjiang Oilfield Company Institute of Remote Sensing and Geographical Information System School of Earth and Space Sciences Peking University Petroleum Exploration and Production Research Institute Sinopec Department of Xinjiang Exploration Project Management Sinopec Shengli Oilfield Company

The method of random forest was used to classify the heavy mineral assemblages of 2 418 Jurassic samples in the southern Junggar Basin, and determine the distribution of the heavy mineral assemblages from the same provenance systems. Based on the analysis of heavy minerals assemblages, ZTR index, sedimentary characteristics, U-Pb zircon ages, whole-rock geochemical and paleocurrent direction analysis, the study reveals that five important provenances were providing sediments to the southern Junggar Basin in the Jurassic period: The North Tianshan(NTS), Central Tianshan(CTS), Bogda Mountains, Zhayier Mountains and Kalamaili Mountains. During the Early Jurassic, NTS-CTS, Kalamaili Mountains and Zhayier Mountains are primary provenances, Bogda Mountains started to uplift and supply clastic materials in the Middle Jurassic. There are three sedimentary area in the Jurassic of southern Junggar Basin: the western part, the central part and the eastern part. In the western part, the clastic materials of the Early Jurassic was mainly from NTS blocks and Zhayier Mountains, and the sediments were dominantly derived from the Zhayier Mountains during the Middle–Late Jurassic. In the central part, the main provenance of the Early Jurassic switched from NTS to CTS. In the Xishanyao Formation, the main source went back to NTS again. The NTS was the primary provenance during the sedimentary periods of Toutunhe Formation and Qigu Formation. In the eastern part, the contribution of CTS and Kalamaili Mountains were considered as major provenances in the Early Jurassic-Xishanyao Formation, small proportion of sediments were from NTS. The Bogda mountains uplifted and started to provide sediments to the Junggar Basin in the sedimentary period of Xishanyao Formation, and became the major source during the Toutunhe Formation period, with small amount of sediments from CTS. The provenance from CTS was hindered during the sedimentary period of Qigu Formation owing to the uplifting of the Bogd

关键词： southern Junggar Basin Jurassic source to sink system provenance heavy minerals assemblages random forest

Thin Film of Perovskite Oxide with Atomic Scale p-n Junctions

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Chemical Research in Chinese Universities 2012年第3期28卷 379-381页

作者： HU Bin HUANG Ke-ke HOU chang-min yuan Hong-ming PANG Guang-sheng FENG Shou-hua State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012P.R.China

Thin films of perovskite manganese oxide Lao.66Ca0.29K0.05MnO3（LCKMO） on Au/ITO（ITO=indium tin oxide） substrates were prepared by off-axis radio frequency magnetron sputtering and characterized by X-ray diffrac- tion（XRD）, high-resolution transmission electron microscopy（HRTEM）, and conductive atomic force microscopy （C-AFM） at room temperature. The thin films with thickness ranged from 100 nm to 300 nm basically show cubic structures with a=0.3886 nm, the same as that of the raw material used, but the structures are highly modulated. C-AFM results revealed that the atomic scale p-n junction feature of the thin films was the same as that of the single crystals. The preparation of the thin films thus further confirms the possibility of their application extending from micrometer-sized single crystals to macroscopic thin film.

关键词： Perovskite oxide Thin film Atomic scale p-n junction

Growth of large scale PtTe,PtTe_(2) and PtSe_(2) films on a wide range of substrates

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Nano Research 2021年第6期14卷 1663-1667页

作者： Kenan Zhang Meng Wang Xue zhou yuan Wang Shengchun Shen Ke Deng Huining Peng Jiaheng Li Xubo Lai Liuwan Zhang Yang Wu Wenhui Duan Pu Yu Shuyun zhou State key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing100084China Department of Mechanical Engineering and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua UniversityBeijing100084China Collaborative Innovation Center of Quantum Matter Beijing100084China

1T phase of transition metal dichalcogenides(TMDCs)formed by group 10 transition metals(***,Pd)have attracted increasing interests due to their novel properties and potential device *** of large scale thin films with controlled phase is critical especially considering that these materials have relatively strong interlayer interaction and are difficult to *** we report the growth of centimeter-scale PtTe,1T-PtTe2 and 1T-PtSe2 films via direct deposition of Pt metals followed by tellurization or *** find that by controlling the Te flux,a hitherto-unexplored PtTe phase can also be obtained,which can be further tuned into PtTe2 by high temperature annealing under Te *** films with different thickness can be grown on a wide range of substrates,including NaCl which can be further dissolved to obtain free-standing PtTe2 or PtSe2 ***,a systematic thickness dependent resistivity and Hall conductivity measurements show that distinguished from the semiconducting PtSe2 with hole carriers,PtTe2 and PtTe films are *** work opens new opportunities for investigating the physical properties and potential applications of group 10 TMDC films and the new monochalcogenide PtTe film.

关键词： transition metal dichalcogenides(TMDCs) selenization tellurization PtSe2 PtTe2 PtTe

Intrinsically stretchable polymer semiconductor based electronic skin for multiple perceptions of force,temperature,and visible light

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Nano Research 2023年第1期16卷 1196-1204页

作者： Dongjuan Liu Pengcheng Zhu Fukang Zhang Peishuo Li Wenhao Huang chang Li Ningning Han Shuairong Mu Hao zhou Yanchao Mao Key Laboratory of Materials Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China

As a stretchable seamless device,electronic skin(E-skin)has drawn enormous interest due to its skin-like sensing *** the basic perception of force and temperature,multiple perception that is beyond existing functions of human skin is becoming an important direction for E-skin ***,the present E-skins for multiple perceptions mainly rely on different sensing materials and heterogeneous integration,resulting in a complex device ***,their stretchability is usually achieved by the complicated microstructure design of rigid ***,we report an intrinsically stretchable polymer semiconductor based E-skin with a simple structure for multiple perceptions of force,temperature,and visible *** E-skin is on the basis of poly(3-hexylthiophene)(P3HT)nanofibers percolated polydimethylsiloxane(PDMS)composite polymer semiconductor,which is fabricated by a facile solution *** E-skin shows reliable sensing capabilities when it is used to perceive strain,pressure,temperature,and visible *** on the E-skin,an intelligent robotic hand sensing and controlling system is further *** with conventional E-skins for multiple perceptions,this E-skin only has a simple monolayer sensing membrane without the need of combining different sensing materials,heterogeneous integration,and complicated microstructure *** a strategy of utilizing intrinsically stretchable polymer semiconductor to create simple structured E-skin for multiple perceptions will promote the development of E-skins in a broad application scenario,such as artificial robotic skins,virtual reality,intelligent gloves,and biointegrated electronics.

关键词： electronic skin stretchable polymer semiconductor multiple perception visible light artificial robotic skin

A new method to enhance the magnetocaloric effect in (Sc,Ti)Fe_(2) via magnetic phase separation

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Journal of Materials Science & Technology 2023年第16期147卷 102-111页

作者： Yuzhu Song Meng Xu Xinqi Zheng chang zhou Naike Shi Qingzhen Huang Shouguo Wang Yong Jiang Xianran Xing Jun Chen Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China NIST Center for Neutron Research National Institute of Standards and TechnologyGaithersburg MD20899-6102United States

Magnetic refrigeration based on the magnetocaloric effect(MCE)is a novel refrigeration technology that will replace traditional vapor-compression refrigeration in the *** in the performance of MCE materials is crucial for the development of magnetic refrigeration *** study presents a new method that enhances the MCE performance of(Sc,Ti)Fe_(2) via magnetic phase *** maximum magnetic entropy change induced by the coexistence of an in-plane ferromagnetic phase(FMab)and a canting antiferromagnetic phase(CAFM)in Sc_(0.3)Ti_(0.7)Fe_(2) is twice that found in other(Sc,Ti)Fe_(2 )***-temperature neutron diffraction experiments directly reveal that the large magnetic entropy change in Sc_(0.3)Ti_(0.7)Fe_(2) is dominated by the transformation from a highly ordered FMab state to a CAFM state with a lower magnetic *** magnetic phase separation is a direct transition from a higher-ordered state with a larger lattice to a lower-ordered state with a smaller lattice that induces a large magnetic order change and lattice *** combination of the metamagnetic transition and negative thermal expansion leads to enhanced *** study suggests the possibility that magnetic phase separation can be an effective approach to achieving and controlling a large MCE in magnetic materials.

关键词： Magnetocaloric effect Neutron diffraction Magnetic structure

Mechanism of fluidized chlorination reaction of Kenya natural rutile ore

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Rare Metals 2014年第4期33卷 485-492页

作者： Li-Ping Niu Pei-yuan Ni Ting-An Zhang Guo-Zhi Lv Ai-Ping zhou Xi-bin Liang De-long Meng School of Materials and Metallurgy Key Laboratory for Ecological Utilization of Multimetallic Mineral (Ministry of Education)Northeastern University Department of Material Science and Engineering KTH-Royal Institute of TechnologySE-100 44 StockholmSweden Titanium Plant Jinchuan Group Company Limited

In this paper, the thermodynamics and kinetics of nature rutile carbochlorination in a fluidized-bed were investigated. The thermodynamic calculations of TiO2-C- C12 system show that when C is excess in the solid phase, titanium tetrachloride and carbon monoxide can exist sta- bly. At high temperature, the reaction with CO as the product is the dominant reaction. The appropriate reaction conditions are as follows： reaction temperature of 950 ℃, reaction time of 40 min, carbon ratio of 30 wt% of rutile, natural rutile particle size of -96 μm, petroleum coke size of -150 μm, and chlorine flow of 0.036 m3.h-1. Under the above conditions, the reaction conversion rate of TiO2 can reach about 95 %. This paper proposed a reaction rate model, and got a rutile chlorination rate formula, which is generally consistent with the experimental data. For the TiO2-C-C12 system, the reaction rate is dependent on the initial radius of rutile particle, density, and the partial pressures of C12. From 900 to 1,000 ℃, the apparent activation energy is 10.569 ***1-1, and the mass diffu- sion is found to be the main reaction-controlling step. The expression for the chlorine reaction rate in the C-C12 sys- tem is obtained, and it depends on the degree of reaction, the partial pressure of C12, and the size of rutile particle.

关键词： Natural rutile Gas-solid reaction Fluidized-bed Carbochlorination Particle