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Food Science and Human Wellness 2024年

作者： han dou Anthony Pius Bassey Jingwen Li Xianming Zeng Keping Ye State Key Laboratory of Meat Quality Control and Cultured Meat Development， Jiangsu Collaborative Innovation Center of Meat Production and Processing， College of Food Science and Technology， Nanjing Agricultural University

Pseudomonas (P.) fragi and P. lundensis have been reported as key spoilage bacteria in aerobically-stored chilled meat. However， the co-spoilage effect of these bacteria has not been effectively evaluated. This study evaluated the spoilage potential of P. fragi， P. lundensis and P. fragi + P. lundensis in vitro and in situ at 4 ℃. The results showed that P. fragi + P. lundensis performed the highest growth rate and displayed larger decomposition zone diameters on Raw-pork juice agar (RJA) plates. P. fragi + P. lundensis inoculants exhibited the strongest proteolytic activity， which resulted in the highest values of trichloroacetic acid (TCA)-soluble peptides， total volatile basic nitrogen (TVB-N) and myofibril fragmentation index (MFI) in chilled pork. Moreover， the inoculated samples showed different pH and sensory changes. Notably， increased amounts of volatile organic compounds (VOCs)， such as octanal， nonanal， 2-nonanone， 1-propanol， 1-octanol， isopropyl acetate， and 2，6-dimethylpyazine， were observed in inoculated P. fragi + P. lundensis samples， hinting their potential use as spoilage markers for spoilage monitoring of co-cultures. This study would provide a deeper understanding of meat spoilage and serve as a reference for future studies to inhibit meat spoilage.

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人工强化负载锰氧化物滤料去除地下水中氨/锰中试

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中国给水排水 2024年第3期40卷 15-22页

作者：窦韩黄廷林程亚西安建筑科技大学环境与市政工程学院陕西西安710055 陕西省环境工程重点实验室陕西西安710055 西北水资源与环境生态教育部重点实验室陕西西安710055

以人工强化负载锰氧化物滤料为研究对象,考察了在两种不同硬度、碱度地下水环境下活性滤料除氨/锰活性形成,以及滤料表面膜负载量与负载强度随时间的变化规律。结果表明,在低硬度、碱度水质环境下运行的1#滤柱除氨/锰活性形成速度显著... 详细信息

以人工强化负载锰氧化物滤料为研究对象,考察了在两种不同硬度、碱度地下水环境下活性滤料除氨/锰活性形成,以及滤料表面膜负载量与负载强度随时间的变化规律。结果表明,在低硬度、碱度水质环境下运行的1#滤柱除氨/锰活性形成速度显著高于高硬度、碱度环境下的2#滤柱,1#滤柱在第9天时出水氨浓度低于0.5 mg/L,2#滤柱在第21天时氨浓度低于0.5 mg/L。此外,人工强化负载滤料负载强度与表面膜负载量分别为0.07、0.92 g/10 g,均高于传统挂膜(0.02和0.072 g/10 g)。通过SEM与XRD发现,滤料形貌及结构在运行过程中发生了改变,成熟的滤料表面存在大量网状结构,并生成了水钠锰矿型锰氧化物。可见,人工强化负载锰氧化物滤料在低碱度、硬度地下水条件下更易形成除氨/锰活性,能够有效去除进水中2 mg/L的氨/锰,具有一定的工程应用价值。

关键词：催化氧化除氨/锰地下水

中国铁路济南局集团有限公司计量器具协检方案研究

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铁道技术监督 2024年第8期52卷 12-17页

作者：韩斗赵英杰中国铁路济南局集团有限公司科技和信息化部山东济南250001 中国铁路济南局集团有限公司计量所山东济南250001

为解决中国铁路济南局集团有限公司各单位计量标准建设不均衡、计量标准资源不能共享、计量器具就地量值溯源困难和委托外部计量技术机构量值溯源的计量器具较多等问题,根据济南局集团有限公司计量器具、计量标准和量值溯源管理现状,统... 详细信息

为解决中国铁路济南局集团有限公司各单位计量标准建设不均衡、计量标准资源不能共享、计量器具就地量值溯源困难和委托外部计量技术机构量值溯源的计量器具较多等问题,根据济南局集团有限公司计量器具、计量标准和量值溯源管理现状,统筹计量标准建设规划,充分利用计量器具量值溯源资源,研究计量器具协检方案。自2022年在济南局集团有限公司实施计量器具协检方案以来,实现了计量标准资源共享,就地就近检定计量器具的目标,从而缩短了时间、降低了成本、提高了效率,提升了计量器具量值保障能力。

关键词：中国铁路济南局集团有限公司计量管理计量标准计量器具量值溯源协同检定

Enrichment and reconfiguration of titanium-bearing phase in vortex smelting reduction process of vanadium-titanium magnetite

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Journal of Iron and Steel Research International 2024年第7期31卷 1582-1589页

作者： Yong-chao han Zhi-he dou Rui Zhang Ting-an Zhang Shuai Fang Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Shenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

To comprehensively utilize the low-iron high-vanadium-titanium magnetite,a new method of vortex smelting reduction of vanadium-titanium magnetite was proposed,and the enrichment and reconstitution regularity of Ti-bearing phases in the slag was investigated through X-ray fluorescence spectrometry,X-ray photoelectron spectroscopy,X-ray diffraction analysis,and optical *** phase diagram revealed that the preferential crystallization of MgTi_(2)O_(5) can be achieved by adjusting the CaO,MgO,and TiO_(2) contents of *** predominant Ti-bearing phases in the slag obtained from the reduction process are MgxTi_(3_x)O_(5)(0≤x≤1)and CaTiO_(3).FeTiO_(3) is present at carbon-iron ratio(CR)=1.3,while MgTi_(2)O4 and TiC are formed at CR=*** enrichment of TiO_(2) in the slag increases first and then decreases as the CR increases,and at CR=1.1,the enrichment of TiO_(2) in the slag reaches 51.3 wt.%.Additionally,the concentrations of MgxTi_(3_x)O_(5)(0≤x≤1)and CaTiO_(3) in the slag,along with the grain width of MgxTi_(3_x)O_(5)(0≤x≤1),decrease with the increase in CR.

关键词： Vanadium-titanium magnetite Vortex smelting reduction Phase reconfiguration TiO_(2)enrichment

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盐河大桥钢桁梁拼装顺序研究

建筑技术 2024年第15期55卷 1809-1811页

作者：银庆友王亮王树臣窦晗陈国中铁一局集团有限公司第三工程分公司陕西宝鸡721006 南京林业大学土木工程学院南京210037

为研究拼装顺序对钢桁梁变形特性及施工难度的影响,采用midas Civil软件对钢桁梁的拼装过程进行仿真分析。根据钢桁梁的特点,提出两种拼装顺序:从一侧往另一侧拼装方案(方案一)和从两侧往跨中拼装方案(方案二)。结果表明:杆件拼装过程... 详细信息

为研究拼装顺序对钢桁梁变形特性及施工难度的影响,采用midas Civil软件对钢桁梁的拼装过程进行仿真分析。根据钢桁梁的特点,提出两种拼装顺序:从一侧往另一侧拼装方案(方案一)和从两侧往跨中拼装方案(方案二)。结果表明:杆件拼装过程中的位移偏差随着拼装的进行逐渐增大,以y向(横桥向)变形最大,z向(竖直向)次之,x向(顺桥向)变形最小。钢桁梁线形调整措施应以y向调整为主,边拼装边调整。布置于上弦节点处的水平间距调节装置调整后,钢桁梁线形控制取得显著改善。方案一产生的最大横向变形明显小于方案二,所需的顶推力也明显小于方案二。方案一有利于控制成桥后钢桁梁的线形。

关键词：公路桥梁跨航道钢桁梁拼装顺序数值模拟

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大跨钢桁梁浮拖施工技术

建筑机械 2024年第7期 67-70页

作者：刘海军车元平张波窦晗陈国中铁一局集团有限公司第三工程分公司陕西宝鸡721006 南京林业大学土木工程学院江苏南京210037

京沪高速公路改扩建工程盐河大桥第2联为95m跨径的下承式钢桁梁,全桥分左右2幅,单幅桥面宽20.5m,上跨既有航道,交叉角度为77°。针对钢桁梁的特点,分析了架桥过程中的重难点,提出了以平板船作为浮墩,千斤顶连续顶推的方法将钢桁梁浮运... 详细信息

京沪高速公路改扩建工程盐河大桥第2联为95m跨径的下承式钢桁梁,全桥分左右2幅,单幅桥面宽20.5m,上跨既有航道,交叉角度为77°。针对钢桁梁的特点,分析了架桥过程中的重难点,提出了以平板船作为浮墩,千斤顶连续顶推的方法将钢桁梁浮运至河对岸。介绍了滑移系统、浮拖系统以及施工过程中的控制要点,依靠卷扬机牵引力克服了横向水流所导致的钢桁梁横向偏位。相比膺架法,浮拖法加快了施工进度,大幅减少了封航时间,同时节约了工程造价。

关键词：高速公路改扩建钢桁梁浮托法同步顶推系统

Effect of slag composition on kinetic behavior of deep deoxidation of 5 wt.% Si high-silicon austenitic stainless steel

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Journal of Iron and Steel Research International 2024年第8期31卷 1873-1885页

作者： Guan-xiong dou han-jie Guo Jing Guo Xue-cheng Peng Qing-yun Chen School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing 100083China

Based on a thermodynamic study of 5 wt.%Si high-silicon austenitic stainless steel(SS-5Si)smelting using CaF_(2)-CaO-Al_(2)0_(3)-Mg-Si0_(2) slag to obtain a low oxygen content of less than 10×10^(-4) wt.%,a kinetic mass transfer model for deep deoxidation was established through laboratory studies,and the effects of slag components and temperature on deoxidation during the slag-steel reaction process of sS-5Si were systematically *** experimental data verified the accuracy of the model *** results showed that the final oxygen content in the steel at 1873 K was mainly controlled by the oxygen content derived from the activity of SiO_(2) regulated by the[Si]-[O]equilibrium reaction in the slag system;in particular,when the slag basicity R(R=w(CaO)/w(SiO2),where w(CaO)and w(SiO_(2))are the contents of CaO and SiO_(2) in the slag,respectively)is 3,the Al2O3 content in the slag needs to be less than 2.7%.The mass transfer rate equation for the kinetics of the deoxidation reaction revealed that the mass transfer of oxygen in the liquid metal is the rate-controlling step under different slag conditions at 1873 K,and the oxygen transfer coefficient ko.m increases with increasing the slag basicity from 4.0×10^(-6)m s^(-1)(R=1)to 4.3×10^(-5) m s^(-1)(R=3).ko.m values at R=2 and R=3 are almost the same,indicating that high slag basicity has little *** integral of the mass transfer rate equation for the deoxidation reaction of SS-5Si under different slag conditions is *** total oxygen content of the molten steel decreases with increasing basicity from an initial content of 22×10^(-4) to 3.2×10^(-4) wt.%(R=3),consistent with the change in ko.m with slag *** R=2,the slag-steel reaction takes 15 min to reach equilibrium(w[O]=5.5×10^(-4) wt.%),whereas at R=3,the slag-steel reaction takes 30 min to reach equilibrium(w[0]=3.2×10^(-4) wt.%).Considering the depth of deoxidation and reaction time of SS-5Si smelting,it is recommended the slag b

关键词： Slag-steel reaction Kinetics Rate-controlling step Deep deoxidation Transfer coefficient

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大跨钢桁梁快速拼装施工技术研究

建筑机械 2024年第5期 269-271,275页

作者：李海鹏刘海军车元平张波窦晗陈国中铁一局集团有限公司第三工程分公司陕西宝鸡721006 南京林业大学土木工程学院江苏南京210037

京沪高速公路改扩建工程盐河大桥为左右两幅分离式桥梁,结构形式为下承式钢桁梁,主跨长95m,线形控制难度大。本工程的显著特点是桥址距京沪高速铁路较近,场地狭窄,工期紧,给钢桁梁快速拼装带来了极大挑战。文章介绍了钢桁梁拼装的施工... 详细信息

京沪高速公路改扩建工程盐河大桥为左右两幅分离式桥梁,结构形式为下承式钢桁梁,主跨长95m,线形控制难度大。本工程的显著特点是桥址距京沪高速铁路较近,场地狭窄,工期紧,给钢桁梁快速拼装带来了极大挑战。文章介绍了钢桁梁拼装的施工技术难点,确定了由一端(小里程)向另一端(大里程)进行拼装的方式。分析了钢桁梁线形产生误差的原因,提出了减小误差的措施,从而保证了钢桁梁成桥后的线形满足设计要求。

关键词：高速公路改扩建钢桁梁拼装线形

DENND1A desensitizes granulosa cells to FSH by arresting intracellular FSHR transportation

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Science China(Life Sciences) 2024年第8期67卷 1620-1634页

作者： Yunde dou Rusong Zhao han Wu Zhiheng Yu Changjian Yin Jie Yang Chaoyan Yang Xiaohua Luan Yixiao Cheng Tao Huang Yuehong Bian Shan han Yuqing Zhang Xin Xu Zi-Jiang Chen han Zhao Shigang Zhao Institute of Women Children and Reproductive HealthShandong UniversityJinan 250012China State Key Laboratory of Reproductive Medicine and Offspring Health Jinan 250012China Key laboratory of Reproductive Endocrinology of Ministry of Education Shandong UniversityJinan 250012China Shandong Key Laboratory of Reproductive Medicine Shandong UniversityJinan 250012China Shandong Provincial Clinical Research Center for Reproductive Health Jinan 250012China National Research Center for Assisted Reproductive Technology and Reproductive Genetics Shandong UniversityJinan 250012China The Affiliated Suzhou Hospital of Nanjing Medical University Suzhou Municipal HospitalNanjing Medical UniversitySuzhou 215008China Gusu School Nanjing Medical UniversitySuzhou 215000China Guangdong Provincial People’s Hospital Guangdong Academy of Medical SciencesGuangzhou 510080China Guangdong-Hong Kong Metabolism&Reproduction Joint Laboratory Guangdong Second Provincial General HospitalGuangzhou 510317China Reproductive Medicine Center Guangdong Second Provincial General HospitalGuangzhou 510317China Research Unit of Gametogenesis and Health of ART-Offspring Chinese Academy of Medical Sciences(No.2021RU001)Jinan 250012China Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics Shanghai 200127China Center for Reproductive Medicine Renji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200127China

Polycystic ovary syndrome(PCOS)is a complex ***-wide association studies(GWAS)have identified several genes associated with this condition,including ***1A encodes a clathrin-binding protein that functions as a guanine nucleotide exchange factor involved in vesicular ***,the specific role of DENND1A in reproductive hormone abnormalities and follicle development disorders in PCOS remain poorly *** this study,we investigated DENND1A expression in ovarian granulosa cells(GCs)from PCOS patients and its correlation with *** results revealed an upregulation of DENND1A expression in GCs from PCOS cases,which was positively correlated with testosterone *** further explore the functional implications of DENND1A,we generated a transgenic mouse model overexpressing Dennd1a(TG mice).These TG mice exhibited subfertility,irregular estrous cycles,and increased testosterone production following PMSG ***,the TG mice displayed diminished responsiveness to FSH,characterized by smaller ovary size,less well-developed follicles,and abnormal expressions of FSH-priming ***,we found that Dennd1a overexpression disrupted the intracellular trafficking of follicle stimulating hormone receptor(FSHR),promoting its internalization and inhibiting *** findings shed light on the reproductive role of DENND1A and uncover the underlying mechanisms,thereby contributing valuable insights into the pathogenesis of PCOS and providing potential avenues for drug design in PCOS treatment.

关键词： PCOS DENND1A FSHR ovarian granulosa cells

High donor-number and low content electrolyte additive for stabilizing zinc metal anode

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Journal of Energy Chemistry 2024年第8期95卷 626-635,I0014页

作者： Yuxin Gong Ruifan Lin Bo Wang Huaizheng Ren Lei Wang han Zhang Jianxin Wang Deyu Li Yueping Xiong Dianlong Wang Huakun Liu Shixue dou MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage State Key Laboratory of Urban Water Resource and EnvironmentSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Institute of Energy Material Science University of Shanghai for Science and TechnologyShanghai 200093China

The aqueous zinc ion batteries(AZIBs)are thought as promising competitors for electrochemical energy storage,though their wide application is curbed by the uncontrollable dendrite growth and gas evolution side ***,to stabilize both zinc anodes and water molecules,we developed a modified electrolyte by adding a trace amount of N,N-diethylformanmide(DEF)into the ZnSO_(4)electrolyte for the first time in zinc ion *** effectiveness of DEF is predicted by the comparison of donor number and its preferential adsorption behavior on the zinc anode is further demonstrated by several spectroscopy characterizations,electrochemical methods,and molecular dynamics *** modified electrolyte with 5%*** content can ensure a stable cycling life longer than 3400 h of Zn‖Zn symmetric cells and an ultra-reversible Zn stripping/plating process with a high coulombic efficiency of 99.7%.The Zn‖VO_(2)full cell maintains a capacity retention of 83.5%and a 104 mA h g^(-1)mass capacity after *** work provides insights into the role of interfacial adsorption behavior and the donor number of additive molecules in designing low-content and effective aqueous electrolytes.

关键词： Aqueous zinc ion batteries Zinc anode Electrolyte additives Donor number Zinc dendrites