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Reduction behavior of iron ore powder by high-volatile coal in thermogravimetric-gas chromatographic and kinetic analysis

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Journal of Iron and Steel Research International 2024年第1期31卷 92-107页

作者： Rui-meng shi Qi-yuan Mi Bin Li Xiao shi Chong Zou Jing Guo Han-jie Guo School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina China International Engineering Consulting Corporation Beijing100048China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

The reduction behavior of iron ore powder by high-volatile coal was investigated,and its kinetic mechanism was *** effect of volatiles in coal on the reduction reaction of iron ore was compared by utilizing a Xinjiang lignite with a high volatile content and its pyrolysis carbon produced by high-temperature pyrolysis to remove volatiles,serving as a *** mass loss and gas composition of the samples during the reduction process were detected using thermo-gravimetric analysis and gas chromatography,and the morphological changes of iron ore powder were observed through scanning electron *** kinetic parameters of the iron oxide reduction reaction were calculated by the Flynn-Ozawa-Wall method,and the kinetic mechanism of volatile participation in the iron oxide reduction reaction was determined through the Coats-Redfern *** results indicate that the coupling effect between the high-volatile coal pyrolysis and reduction reactions occurs during the second stage of the entire coupling process,which corresponds to the late stage of coal pyrolysis with a substantial release of H_(2)and *** volatiles in coal actively participated in the reduction reaction,reducing the initiation temperature of the reaction by around 200℃.The reduction of iron oxides by high-volatile coal was jointly promoted by the"hydrogen cycle"and"carbon cycle",resulting in a higher reduction extent and metallization rate at the end of the *** high-volatile coal was used as the reductant,the average activation energy for the entire process was 76.5 kJ/mol,a significant decrease compared to the employment of pyrolysis carbon without volatiles as the reductant(1167 kJ/mol).

关键词： Direct reduction High-volatile coal Volatile Kinetics Reduction mechanism

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Neighbor Product Distinguishing Total Coloring via Combinatorial Nullstellensatz

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Acta Mathematicae Applicatae Sinica 2024年

作者： meng-ying shi Li ZHANG School of Mathematical Sciences Tongji University

Let G =(V, E) be a simple graph and φ : V(G) ∪ E(G) → {1, 2, · · ·, k} be a proper total-k-coloring of G. Let f(v) = φ(v)Π(uv∈E(G))φ(uv). The coloring φ is neighbor product distinguishing if f(u) ≠ f(v) for each edge uv ∈ E(G). The neighbor product distinguishing total chromatic number of G, denoted by χΠ’’(G),is the smallest integer k such that G admits a k-neighbor product distinguishing total coloring. Li et al. conjectured that χΠ’’(G) ≤ △(G) + 3 for any graph with at least two vertices and confirmed the conjecture for K4-minor free graph. In this paper, we prove that for a graph G with at least two vertices,(1) if mad(G) <(60)/(17),then χΠ’’(G) ≤ max{△ + 2, 8};(2) if mad(G) <8/3, then χΠ’’(G) ≤ max{△ + 2, 6}. Furthermore, by using the Combinatorial Nullstellensatz, we simplify their proof and show that χΠ’’(G) ≤ max{△(G) + 2, 6} for any K4-minor free graph.

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Semi-volatile organic compounds in a museum in China:A non-targeted screening approach

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Science China(Technological Sciences) 2024年第9期67卷 2693-2705页

作者： SONG ZiDong NIAN LuYing shi meng REN XiaoPeng TANG Ming shi AnMei HAN Ying LIU Min WANG LuYang ZHANG YinPing XU Ying FENG Xiaomeng Department of Building Science Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Indoor Air Quality Evaluation and Control Beijing 100084China National Museum of China Beijing 100006China Department of Endocrinology Beijing Chao-Yang HospitalCapital Medical UniversityBeijing 100020China

Non-targeted analysis(NTA)was conducted to identify semi-volatile organic compounds(SVOCs)in a museum in China using the gas chromatography(GC)-Orbitrap-mass spectrometer(MS).Approximately 160 SVOCs were detected,of which 93 had not been reported in previous studies of museum *** of the detected SVOCs were found to be associated with the chemical agents applied in conservation treatment and the materials used in *** results of hierarchical cluster analysis(HCA)indicated a spatial variation of SVOCs in the indoor air in the museum,but there were no obvious temporal differences of SVOCs observed in indoor ***'s correlation analysis showed that several classes of SVOCs were well correlated,suggesting their common *** and plasticizers were found to be the primary sources of SVOC pollution detected in the *** with compounds in outdoor air,indoor SVOCs had a lower level of unsaturation and more portions of chemically reduced *** study is the first of its kind to comprehensively characterize SVOCs in a museum using an automated NTA approach with *** SVOCs identified in the current study are likely to be present in other similar museums;therefore,further examination of their potential impacts on cultural heritage artifacts,museum personnel,and visitors may be warranted.

关键词： non-target analysis high-resolution mass spectrometry semi-volatile organic compounds museum environment air pollutants

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Loss of monopolar spindle-binding protein 3B expression promotes colorectal cancer malignant behaviors by activation of target of rapamycin kinase/autophagy signaling

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World Journal of Gastroenterology 2024年第26期30卷 3229-3246页

作者： Juan Sun Jin-Xiu Zhang meng-shi Li meng-Bin Qin Ruo-Xi Cheng Qing-Ru Wu Qiu-Ling Chen Dan Yang Cun Liao shi-Quan Liu Jie-An Huang Department of Gastroenterology The Second Affiliated Hospital of Guangxi Medical UniversityNanning 530007Guangxi Zhuang Autonomous RegionChina Department of Colorectal&Anal Surgery The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina

BACKGROUND Monopolar spindle-binding protein 3B(MOB3B)functions as a signal transducer and altered MOB3B expression is associated with the development of human *** To investigate the role of MOB3B in colorectal cancer(CRC).METHODS This study collected 102 CRC tissue samples for immunohistochemical detection of MOB3B expression for association with CRC *** overexpression and knockdown of MOB3B expression were induced in CRC cell lines,changes in cell viability,migration,invasion,and gene expression were *** cell autophagy was detected using transmission electron microscopy,while nude mouse xenograft experiments were performed to confirm the in-vitro *** MOB3B expression was reduced in CRC vs normal tissues and loss of MOB3B expression was associated with poor CRC *** of MOB3B protein in vitro attenuated the cell viability as well as the migration and invasion capacities of CRC cells,whereas knockdown of MOB3B expression had the opposite effects in CRC *** the molecular level,microtubule-associated protein light chain 3 II/I expression was elevated,whereas the expression of matrix metalloproteinase(MMP)2,MMP9,sequestosome 1,and phosphorylated mechanistic target of rapamycin kinase(mTOR)was downregulated in MOB3B-overexpressing RKO *** contrast,the opposite results were observed in tumor cells with MOB3B *** nude mouse data confirmed these in-vitro findings,i.e.,MOB3B expression suppressed CRC cell xenograft growth,whereas knockdown of MOB3B expression promoted the growth of CRC cell *** Loss of MOB3B expression promotes CRC development and malignant behaviors,suggesting a potential tumor suppressive role of MOB3B in CRC by inhibition of mTOR/autophagy signaling.

关键词： Colorectal cancer Monopolar spindle-binding protein 3B Mechanistic target of rapamycin kinase Autophagy Prognosis

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Repurposing diacerein to suppress colorectal cancer growth by inhibiting the DCLK1/STAT3 signaling pathway

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Chinese Journal of Natural Medicines 2024年第4期22卷 318-328页

作者： YE Qiaobei ZHU Yu shi meng LV Linxi GONG Yuyan ZHANG Luyao YANG Lehe ZHAO Haiyang ZHAO Chengguang XU Huanhai Affiliated Yueqing Hospital Wenzhou Medical UniversityWenzhou 325600China The Institute of Life Sciences Biomedical Collaborative Innovation Center of Zhejiang ProvinceWenzhou UniversityWenzhou 325035China School of Pharmaceutical Sciences Wenzhou Medical UniversityWenzhou 325035China

Double cortin-like kinase 1(DCLK1)exhibits high expression levels across various cancers,notably in human colorectal cancer(CRC).Diacerein,a clinically approved interleukin(IL)-1βinhibitor for osteoarthritis treatment,was evaluated for its impact on CRC proliferation and migration,alongside its underlying mechanisms,through both in vitro and in vivo *** study employed MTT assay,colony formation,wound healing,transwell assays,flow cytometry,and Hoechst 33342 staining to assess cell proliferation,migration,and ***,proteome microarray assay and western blotting analyses were conducted to elucidate diacerein’s specific mechanism of *** findings indicate that diacerein significantly inhibits DCLK1-dependent CRC growth in vitro and in *** high-throughput proteomics microarray and molecular docking studies,we identified that diacerein directly interacts with ***,the suppression of p-STAT3 expression following DCLK1 inhibition by diacerein or specific DCLK1 siRNA was ***,diacerein effectively disrupted the DCLK1/STAT3 signaling pathway and its downstream targets,including MCL-1,VEGF,and survivin,thereby inhibiting CRC progression in a mouse model,thereby inhibiting CRC progression in a mouse model.

关键词： DCLK1 Diacerein Rhein STAT3 Colorectal cancer

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Microglial glutaminase 1 mediates chronic restraint stress-induced depression-like behaviors and synaptic damages

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Signal Transduction and Targeted Therapy 2024年第1期9卷 40-43页

作者： Huili Chen Shengyang Fu Xiangyu Li meng shi Jiazhen Qian Shu Zhao Ping Yuan Lu Ding Xiaohuan Xia Jialin C.Zheng Center for Translational Neurodegeneration and Regenerative Therapy Tongji Hospital affiliated to Tongji University School of Medicine200065 ShanghaiChina Department of Cardio-Pulmonary Circulation Shanghai Pulmonary HospitalSchool of MedicineTongji UniversityShanghaiChina Translational Research Institute of Brain and Brain-Like Intelligence Shanghai Fourth People’s Hospital affiliated to Tongji University School of Medicine200434 ShanghaiChina

Dear Editor,Major depressive disorder(MDD)is one of the most common psychiatric illnesses that significantly increase the risk of suicide.1 Stress-triggered dysfunctions of microglia have been identified as a commonly occurred pathological feature of MDD.1–3 Microglial dysfunction contributes to the pathogenesis of MDD via immunoresponses/neuroinflammation-mediated neural damage and pathological synapse loss-mediated neural circuit disruption.1 Although the involvement of microglia in MDD has been widely investigated,the molecular mechanisms underlying microglial dysfunction remain largely ***,we identified glutaminase 1(Gls1)as one key protein that participates in microglial dysfunction.4–6 Gls1 catalyzes the hydrolysis of glutamine to produce glutamate in the brain.4 Besides its well-known role in excitatory neurotoxicity,we found Gls1 up-regulation in microglia in animal models of Alzheimer’s disease and ischemic stroke.4,7 Gls1 activates microglia to overproduce cytokines and release inflammatory extracellular vesicles,therefore leading to neuroinflammation in animal models of Alzheimer’s disease and ischemic stroke.4–6 More importantly,Gls1 has been found to be up-regulated in the brains of MDD patients,and microglial Gls1 deficiency mitigated LPS-induced depression-like behaviors.8 However,LPS exposure is not an appropriate model to mimic MDD phenotypes,leaving the involvement of Gls1 in MDD an undetermined question.

关键词： involvement inflammation media

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Magnetism Measurements of Two-Dimensional van der Waals Antiferromagnet CrPS_(4)Using Dynamic Cantilever Magnetometry

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Chinese Physics Letters 2024年第10期41卷 123-128页

作者： Qi Li Weili Zhen Ning Wang meng shi Yang Yu Senyang Pan Lin Deng Jiaqiang Cai Kang Wang Lvkuan Zou Zhongming Zeng Zhaosheng Wang Jinglei Zhang Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China School of Advanced Manufacturing Engineering Hefei UniversityHefei 230601China Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of SciencesSuzhou 215123China

Recent experimental and theoretical work has focused on two-dimensional van der Waals(2D vdW)magnets due to their potential applications in sensing and spintronics *** measurements of these emerging materials,conventional magnetometry often encounters challenges in characterizing the magnetic properties of small-sized vdW materials,especially for antiferromagnets with nearly compensated magnetic ***,we investigate the magnetism of 2D antiferromagnet CrPS_(4)with a thickness of 8nm by using dynamic cantilever magnetometry(DCM).

关键词： (4) magnets Magnet

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直圆连接路段K型线与回旋线对比分析

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长安大学学报（自然科学版） 2024年第3期44卷 54-65页

作者：潘兵宏石蒙蒙田鑫长安大学公路学院陕西西安710064

为了从多个维度对比直圆连接路段回旋线与K型线的差异,分析对比K型线与回旋线在横向运动、侧倾运动和横摆运动3个自由度下的动力学差异,验证K型线作为缓和曲线的可行性的同时,研究分析车辆在基于K型线的直圆连接路段上的行车稳定性。利... 详细信息

为了从多个维度对比直圆连接路段回旋线与K型线的差异,分析对比K型线与回旋线在横向运动、侧倾运动和横摆运动3个自由度下的动力学差异,验证K型线作为缓和曲线的可行性的同时,研究分析车辆在基于K型线的直圆连接路段上的行车稳定性。利用K型线航向角特点,从微分和解析几何角度分析验证K型线和回旋线的曲率及曲率变化率状态。利用动力学软件CarSim对5种基于不同设计速度建立的道路模型进行仿真模拟,选取车辆横向加速度、车辆侧倾角、车辆横摆角及车辆方向盘转角4个指标作为评价依据,分析车辆在由2种不同缓和曲线连接的直圆连接路段上行驶时,其行车稳定性、驾驶人舒适性的状态差异。采用熵值法对各指标进行赋权,综合比较由K型线和回旋线连接的直圆路段的优劣。研究结果表明:K型线具有曲率及曲率变化率连续的优点;在设计指标相同条件下,K型线上车辆的各维度稳定参数均满足现有《公路路线设计规范》(JTG D20—2017)要求,且优于回旋线;随着设计速度的减小,K型线与回旋线之间的差异愈加明显,K型线在行车稳定性和舒适性方面的优势愈显著;在设计速度相同的前提下,K型线在驾驶稳定性、驾驶人行车舒适性方面整体优于回旋线;在设计速度较小时,K型线的优势更显著,可将K型线应用于设计速度较小的道路线形设计中,以保证并提高道路行车的稳定性及舒适性。

关键词：道路工程路线设计曲线设计 K型线仿真模型行车稳定性

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基于符号回归方法探索磁性斯格明子结构近似解析式

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物理学报 2024年第1期73卷 43-50页

作者：史猛王伟伟杜海峰中国科学院合肥物质科学研究院强磁场科学中心合肥 230031 中国科学技术大学合肥 230026 安徽大学物质科学与信息技术研究院合肥 230601 中国科学院合肥物质科学研究院强磁场科学中心合肥 230031

磁性斯格明子是一种非平庸的拓扑磁结构,它能够在具有Dzyaloshinskii-Moriya(DM)相互作用的手性磁体中稳定存在,其静态以及动态特性与其结构特征息息相关.然而,一般情况下斯格明子结构解析式并不存在.因此,许多研究者给出了近似解析式.... 详细信息

磁性斯格明子是一种非平庸的拓扑磁结构,它能够在具有Dzyaloshinskii-Moriya(DM)相互作用的手性磁体中稳定存在,其静态以及动态特性与其结构特征息息相关.然而,一般情况下斯格明子结构解析式并不存在.因此,许多研究者给出了近似解析式.本文介绍了使用符号回归算法探索磁性斯格明子结构解析式的新方法,在考虑DM相互作用和外部磁场对磁性斯格明子结构的影响下,使用符号回归算法得到了两个较为合适的近似解析式,其适用范围与占主导地位的相互作用有关.研究结果验证了符号回归算法在探索磁性斯格明子结构解析式的强大能力,为磁结构的解析式探索提供了新思路.

关键词：磁性斯格明子符号回归磁性斯格明子结构 Dzyaloshinskii-Moriya相互作用

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基于微波热声成像的植物叶片水分含量分布无损检测技术研究

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生物化学与生物物理进展 2024年第8期51卷 1963-1970页

作者：谢实梦汤永辉黄林电子科技大学电子科学与工程学院成都611731

目的植物叶片水分含量分布是衡量植物生理生化的重要指标,该指标也是农业科学领域中制定抗旱策略的重要依据。微波成像对水分含量分布和变化具有高对比度,超声成像对水分含量分布具有高分辨率。据此,本文提出兼具微波和超声成像优势的... 详细信息

目的植物叶片水分含量分布是衡量植物生理生化的重要指标,该指标也是农业科学领域中制定抗旱策略的重要依据。微波成像对水分含量分布和变化具有高对比度,超声成像对水分含量分布具有高分辨率。据此,本文提出兼具微波和超声成像优势的无损微波热声成像(thermoacoustic imaging,TAI)技术,并用此技术开展了植物叶片水分含量分布的无损检测研究,进行植物叶片水分含量分布的检测,对于实现精准灌溉、发展节水农业、提高水资源利用率有重要意义。方法本文构建了激发频率3.0 GHz、横向分辨率406μm的二维透射式TAI系统。基于主动加热技术(150℃热风,90 s),模拟3组曼陀罗叶片水分流失过程,对其TAI图像进行定量分析。结果加热导致叶片局部水分流失,微波热声信号降低(信号最大变化量为10%),验证了基于TAI技术实现植物叶片水分含量变化无损检测的可行性。实现了曼陀罗、野茼蒿和紫苏叶片水分含量分布的无损检测,检测结果与核磁共振成像吻合。结论本研究有助于实现精准灌溉,为植物在正常和胁迫环境下对环境的响应特性研究提供技术支撑。尤其是与非接触超声检测技术相结合,可以实现植物叶片水分含量的遥感成像,更具实用价值。

关键词：微波热声成像植物叶片水分含量分布

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