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Gas release characteristics during carbonization of iron coke hot briquette and influence of heating rate

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Journal of Iron and Steel Research International 2023年第11期30卷 2163-2172页

作者： Zi-yu Wang Dong Han zheng-gen liu Man-sheng Chu Yong-jie Zhang Li-feng Zhang Ji-wei Bao Ming-yu Wang School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Engineering Research Center of Frontier Technologies for Low-Carbon Steelmaking(Ministry of Education) Shenyang110819LiaoningChina Liaoning Province Engineering Research Center for Technologies of Low-Carbon Steelmaking Shenyang110819LiaoningChina

The release characteristics of CH_(4),H_(2),CO and CO_(2) from iron coke hot briquette(ICHB)during carbonization were *** results show that compared with briquette without iron ore,Fe_(3)O_(4) can inhibit the release rate of H2 and promote the production of CO and CO_(2).In addition,when the heating rate increases from 3 to 7℃/min,the release rates of CH4 and H2 increase,while the release rates of CO and CO_(2) first increase and then *** carbonization process of ICHB was segmented,and corresponding kinetic analysis was carried *** results show that the activation energy of StageⅡand StageⅣis higher in the carbonization process of ICHB,and the active pyrolysis of coal and the reduction of iron ore occur in these two *** addition,the effect of heating rate on the kinetic parameters of ICHB carbonization process was *** was found that when the heating rate increased,the reaction activation energy of StageⅣdecreased first and then increased,which was consistent with the release law of CO and CO_(2).The analysis showed that the increase in heating rate leads to more reactions at higher temperatures,resulting in an increase in the release rate of some *** addition,thermal hysteresis can also cause some processes to fail to fully react at the end of *** is also found that the apparent activation energy and preexponential factor have kinetic compensation effect during the car-bonization of ICHB.

关键词： Iron coke hot briquette Carbonization Gas release characteristic Heating rate Kinetics

十溴二苯乙烷对雄性大鼠的生殖毒性及豌豆肽的保护保用

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毒理学杂志 2024年第1期38卷 5-11,19页

作者：刘彩培郑刘根杨永浩赵祥忠赵秀兰张秀蕾山东大学公共卫生学院毒理与营养系山东济南250012 山东大学公共卫生学院与预防医学实验教学中心山东济南250012 齐鲁工业大学食品科学与工程学院山东济南250306

目的探讨十溴二苯乙烷(decabromodiphenyl ethane,DBDPE)对大鼠雄性生殖系统的损伤作用及豌豆肽的保护作用。方法SPF级成年雄性Wistar大鼠40只,随机分为对照组、DBDPE低剂量组、DBDPE高剂量组和DBDPE高剂量+豌豆肽组。DBDPE和豌豆肽分... 详细信息

目的探讨十溴二苯乙烷(decabromodiphenyl ethane,DBDPE)对大鼠雄性生殖系统的损伤作用及豌豆肽的保护作用。方法SPF级成年雄性Wistar大鼠40只,随机分为对照组、DBDPE低剂量组、DBDPE高剂量组和DBDPE高剂量+豌豆肽组。DBDPE和豌豆肽分别经口灌胃和饮水给予大鼠,连续8周。实验结束,采用精子分析仪分析大鼠精子活力,精子快速染色和苏木素-伊红(HE)染色分别评价大鼠精子形态和睾丸结构改变,免疫组织化学染色和Western blot检测生殖细胞特异标记蛋白死盒解旋酶4(DEAD-box polypeptide 4,Ddx4)蛋白表达,TUNEL染色检测睾丸细胞的凋亡,Western blot检测睾丸组织凋亡相关蛋白Bax、Bcl2、Caspase-3和cleaved Caspase-3的蛋白表达。结果与对照组相比,DBDPE染毒组大鼠精子活力与质量明显下降(P<0.05),染毒组大鼠精子出现畸形;染毒大鼠睾丸生精小管生精上皮厚度降低、空泡化;染毒大鼠生殖细胞Ddx4表达降低;染毒大鼠睾丸生殖细胞凋亡;DBDPE染毒大鼠睾丸组织Ddx4蛋白表达水平较对照组明显降低(LSD-t=4.85,LSD-t=6.90,LSD-t=2.94,P<0.05),Bax和cleaved Caspase-3蛋白表达水平升高,Bcl2表达下降;与DBDPE高剂量组相比,DBDPE高剂量+豌豆肽组的精子活力降低、睾丸形态学损伤在一定上得到改善,大鼠生殖细胞凋亡明显减轻。结论DBDPE导致雄性大鼠睾丸组织病理损伤、生殖细胞凋亡、精子活力下降,豌豆肽对DBDPE的生殖毒性具有一定的保护作用。

关键词：十溴二苯乙烷精子活力死盒解旋酶4 生殖毒性豌豆肽

Fatigue-resistant sliding ferroelectricity

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Science China Materials 2024年第10期67卷 3417-3418页

作者： zheng liu School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

The direction of spontaneous polarization in ferroelectricity can be reoriented by an external electric *** special feature of ferroelectricity is important candidates for fabricating advanced nonvolatile random-access memory[1].However,repeatedly switching polarization induces the ferroelectric device performance degenerates due to a reduction of polarization.

关键词： polarization ferroelectric field.

Recent advances in multifunctional metal-organic frameworks for lithium metal batteries

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Science China Chemistry 2024年第3期67卷 759-773页

作者： Jiaqi Li zheng Weng Zuosu Qin Ying Zhang Ning Zhang Xiaohe liu Chuankun Jia gen Chen Jiang Zhou School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South University Zhongyuan Critical Metals Laboratory Zhengzhou University College of Materials Science and Engineering Changsha University of Science&Technology

In view of novel materials in the field of lithium metal batteries(LMBs), metal-organic frameworks(MOFs) have attracted extensive research interest owing to their controllable pore size, unsaturated metal sites and multifunctional organic groups. A variety of MOFs have been elaborately calculated and synthesized to be applied as separator coating, electrolyte modulators and solid-state electrolyte fillers in LMBs. In this mini-review, we summarize the mechanism of MOFs to limit the migration of anions, improve the Li-ion transference number and prolong the lifespan of LMBs. Suitable pore structure of MOFs can physically restrict the movement of Li^(+). Unsaturated metal sites can adsorb anions by electrostatic interaction. In addition,multifunctional organic functional groups that limit the migration of anions are discussed. Finally, the key challenges and perspectives in the development direction of MOFs-based separators and electrolytes are further elaborated.

关键词： metal-organic frameworks lithium metal battery separator electrolyte

Stepwise recovery of magnesium from low-grade ludwigite ore based on innovative and clean technological route

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Transactions of Nonferrous Metals Society of China 2018年第11期28卷 2384-2396页

作者： Xiao-jiao FU Man-sheng CHU Li-hua GAO zheng-gen liu School of Metallurgy Northeastern UniversityShenyang 110819China

A novel and clean technological route for the comprehensive utilization of low-grade ludwigite ore was proposed, inwhich magnesium was extracted by metallizing reduction？magnetic separation, sulfuric acid leaching and ethanol precipitationoperation. Meanwhile, iron-rich product, silicon-rich product and boron-rich product were obtained, respectively. In the process ofmetallizing reduction-magnetic separation, 94.6% of magnesium was enriched in the non-magnetic substance from the ore reducedat 1250 ℃ for 60 min with the ore size of 0.50-2.00 mm and coal size of 0.50-1.50 mm. When the non-magnetic substance wasleached at 90 ℃ for 15 min with the liquid-to-solid ratio of 7：1, 87.4% of magnesium was leached into the liquor separated fromsilicon gathering in leaching residue. The ethanol precipitation was conducted for 30 min with the ethanol-to-original liquid volumeratio of 1.5：1 at room temperature. 97.2% of magnesium was precipitated out with the initial concentration of 0.8 mol/L in the formof MgSO4·7H2O.

关键词： ludwigite magnesium metallizing reduction leaching precipitation recovery

Preparation of chitosan modified fly ash under acid condition and its adsorption mechanism for Cr(VI)in water

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Journal of Central South University 2021年第6期28卷 1652-1664页

作者： JIANG Chun-lu WANG Rui CHEN Xing zheng liu-gen CHENG Hua School of Resource and Environmental Engineering Anhui Province Engineering Laboratory for Mine Ecological RemediationAnhui UniversityHefei 230601China College of Geoscience and Surveying Engineering China University of Mining&Technology(Beijing)Beijing 100083China

Chitosan-coated fly ash(CWF)was prepared by the acid leaching-coating *** and fly ash were crosslinked in the solution of acetic acid and sulfuric *** microstructure of CWF was conducted by scanning electron microscope(SEM)and X-ray diffraction(XRD).The removal of Cr(VI)from water by CWF was studied by adsorption *** composite prepared by the experiment developed a pore structure and a crystal structure similar to SiO_(2) and chitosan chain-like coating was formed on the surface of fly *** new modified material has larger surface roughness,specific surface area and more adsorption *** Cr(VI)was enriched in modified materials by electrostatic adsorption between CrO_(4)^(2−)、CrO_(7)^(2−)and-NH_(3)^(+) group and surface acid functional *** movement of Cr(VI)in solution is a diffusion process from the main body of the liquid phase to the surface of the liquid film.

关键词： chitosan fly ash(CWF) Cr(VI) adsorption modification

Effects of MgO/Al2O3 ratio on viscous behaviors and structures of MgO-Al2O3-TiO2-CaO-SiO2 slag systems with high TiO2 content and low CaO/SiO2 ratio

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Transactions of Nonferrous Metals Society of China 2020年第3期30卷 800-811页

作者： Cong FENG Li-hua GAO Jue TANG zheng-gen liu Man-sheng CHU School of Metallurgy Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

The effects of MgO/Al2 O3 ratio on the viscous behaviors of MgO-Al2 O3-TiO2-CaO-SiO2 systems were investigated by the rotating cylinder *** spectroscopy was used to analyze the structural characteristics of slag and Factsage 7.0 was adopted to demonstrate the liquidus temperature of *** results show that the viscosity and activation energy for viscous flow decrease when the MgO/Al2O3 ratio increases from 0.82 to *** break point temperature and liquidus temperature of slag initially decrease and subsequently *** complex viscous structures are gradually depolymerized to simple structural *** conclusion,with the increase of MgO/Al2O3 ratio,the degree of polymerization of slag decreases,which improves the fluidity of *** variations of liquidus temperature of slag lead to the same changes of break point temperature.

关键词： vanadium-bearing titanomagnetite titanium-bearing slag viscous behavior degree of polymerization of slag MgO/Al2O3 ratio

Effect of Pre-strain on Microstructure and Stamping Performance of High-strength Low-alloy Steel

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Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 774-780页

作者：刘坡 WEN Zhicheng liu zheng 许峰 School of Mechanical Engineering Guilin University of Aerospace TechnologyGuilin 541004China School of Automotive Engineer-ing Changshu Institute of TechnologyChangshu 215500China

In this study,pre-strain ranging from 0 to 0.12 was applied through uniaxial tension on high-strength low-alloy(HSLA)specimens with four kinds of grain *** of pre-strain and grain size on me-chanical property was investigated through tensile *** of the pre-strained and tensile tested samples were analyzed,*** 30.8°v-bending and following flattening,as well as Erichson cupping tests,were performed on the pre-strained *** show the elongation ratio of grain and dislocation density increases with *** platform is removed when pre-strain is larger than 0.06 while yielding plateau period decreases with pre-strain less than 0.06 due to reduction of pinning *** 30.8°v-bending and the following flattening tests are successfully accomplished on all the pre-strained samples with different grain *** in grain size,along with increase in pre-strain,causes increase in strength and decrease in elongation rate as well as cupping ***-strain causes very slight effect on bending ability,much less than that on mechanical property and cupping test *** impact of the pre-strain and grain size on HSLA steel deformability is inconspicuous.

关键词： strain hardening dislocation texture bending erichson cupping test

On the Specificity of Nanozymes: A Perspective

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Chinese Journal of Chemistry 2024年第13期42卷 1515-1522页

作者： gen Wei Shuje liu Yung-Kang Peng Hui Wei Department of Biomedical Engineering College of Engineering and Applied SciencesNanjing National Laboratory of MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjingJiangsu 21023China Department of Chemistry.City University of Hong Kong Hong Kong 999077Hong Kong SARChina State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringChemistry and Biomedicine Innovation Center(ChemBIC)Nanjing UniversityNanjingJiangsu 210023China NMPA Key Laboratory for Biomedical Optics HangzhouZhejiang 310018China

We have compiled eight promising strategies for enhancing the specificity and selectivity of nanozymes,as depicted in the comprehensive summary *** exhibit intricate and sophisticated structures,including substrate channels and active sites,which can inform the design of *** of these structural features and the application of facet engineering/doping techniques can significantly enhance the catalytic specificity of ***,the use of Molecularly Imprinted Polymers(MiPs)to coat nanozymes represents an effective approach to impart substrate ***,several straightforward stopgap strategies have been devised to improve nanozyme specificity for analytical applications,such as the integration of biorecognition elements and nanozyme sensor arrays through surface modification.

关键词： Nanozymes Enzymes Catalytic activity Specificity Perspective