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低碳钛、钒微合金钢中的相间析出

贾涛,魏娇,冯洁,张维娜,刘振宇,王国栋

《中国工程科学》 2014年第16卷第1期页码 88-92

摘要：

针对目前较少关注的Ti-V微合金体系，在Formaster—FII 膨胀仪上进行奥氏体/铁素体两相区等温，在铁素体相变同时获得Ti、V复合相间析出。

关键词： Ti-V微合金钢相间析出等温相变透射电子显微镜

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微合金钢回顾与展望

王仪康

《中国工程科学》 2000年第2卷第2期页码 77-82

摘要：微合金钢就是这些“高技术钢材”中用量最大的一种。在过去十年，我国针对大型露天矿重型设备、高压输送管线和制造运输集装箱需要发展微合金钢的经验表明，它是在高技术条件下生产的高经济效益钢材。展望21世纪，微合金钢由于有利于环境保护又有技术发展深度，在我国高压输气管线、造船和建筑钢结构方面还会有进一步发展。应列为创新项目，重点扶植、注意跟踪、及时开发，以带动钢铁工业技术改造。

关键词：微合金钢控制轧制管线钢板耐候钢板 SUF钢板环境保护材料

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Ni-Ti-Cu-V四元薄膜库中微观结构和相变的组合合成和高通量表征 Article

Naila M. Al Hasan, Huilong Hou, Suchismita Sarkar, Sigurd Thienhaus, Apurva Mehta, Alfred Ludwig, Ichiro Takeuchi

《工程（英文）》 2020年第6卷第6期页码 637-643 doi: 10.1016/j.eng.2020.05.003

摘要：

过去70年来，基于Ni-Ti的形状记忆合金（shape memory alloy, SMA）已得到广泛使用，但是提高其功能稳定性仍然是实现更稳健和更高级应用的关键。因此，用三元和四元元素合金化来微调SMA 的晶格参数和热滞，成为材料研究中的一个难题。组合材料科学允许从多种表征技术中简化合成过程和数据管理。本研究采用磁控溅射的方法，在热氧化的硅晶片上制备了具有成分分布的Ni-TiCu-V薄膜库。使用高通量波长色散光谱、同步加速器X射线衍射和温度相关的电阻，测量研究并确定了成分相关的相变温度和微观结构。应用中，这些合金成分在给定工作温度范围内提供了选择的灵活性。结合薄膜库的局部微观结构和组成，讨论了四元体系的相图和功能特性的相关性。

关键词： Ni–Ti–Cu–V合金组合材料科学四元合金形状记忆合金薄膜库弹性冷却热弹性冷却相变高通量表征属性映射机器学习

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Fabrication and in vivo evaluation of Ti6Al4V implants with controlled porous structure and complex shape

Xiang LI, Yun LUO, Chengtao WANG, Wenguang ZHANG, Yuanchao LI

《机械工程前沿（英文）》 2012年第7卷第1期页码 66-71 doi: 10.1007/s11465-012-0302-y

摘要：

Electron beam melting process was used to fabricate porous Ti6Al4V implants. The porous structure and surface topography of the implants were characterized by scanning electron microscopy (SEM) and digital microscopy (DM). The results showed that the pore size was around 600 and the porosity approximated to 57%. There was about±50 μm of undulation on implants surfaces. Standard implants and a custom implant coupled with porous sections were designed and fabricated to validate the versatility of the electron beam melting (EBM) technique. After coated with bone-like apatite, samples with fully porous structures were implanted into cranial defects in rabbits to investigate the in vivo performance. The animals were sacrificed at 8 and 12 weeks after implantation. Bone ingrowth into porous structure was examined by histological analysis. The histological sections indicated that a large amount of new bone formation was observed in porous structure. The newly formed bone grew from the calvarial margins toward the center of the bone defect and was in close contact with implant surfaces. The results of the study showed that the EBM produced Ti6Al4V implants with well-controlled porous structure, rough surface topography and bone-like apatite layer are beneficial for bone ingrowth and apposition.

关键词： electron beam melting process implant porous structure bone ingrowth

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一种新的变形高温合金强化方法——磷硼微合金复合强化

胡壮麒,孙文儒,宋洪伟

《中国工程科学》 2005年第7卷第3期页码 17-26

摘要：

阐述了磷、硼的微合金强化作用。磷、硼微合金强化可成倍提高变形合金的持久寿命、降低蠕变速率一个数量级以上。利用磷、硼微合金化技术可发展长寿命高温合金，提高IN718合金的使用温度发展可在700℃长期使用并具有优良性能的涡轮盘合金。

关键词：变形高温合金磷硼微合金化

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Effective regeneration of thermally deactivated commercial V-W-Ti catalysts

Xuesong SHANG, Jianrong LI, Xiaowei YU, Jinsheng CHEN, Chi HE

《化学科学与工程前沿（英文）》 2012年第6卷第1期页码 38-46 doi: 10.1007/s11705-011-1167-z

摘要： An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH Cl (1 mol/L) and dilute H SO (0.5 mol/L), were employed to treat the used catalyst. The effects of temperature and the regeneration process on the structural and textural properties of the catalysts were determined by X-ray diffraction, scanning electron microscopy, N adsorption/desorption, elemental analysis and Fourier transform infrared spectroscopy. The results suggest that the anatase phase of the used catalyst is maintained after exposure to high temperatures. Some of the catalytic activity was restored after regeneration. The catalyst regenerated by aqueous NH Cl had a higher activity than that of the catalyst treated by dilute H SO . The main reason is that the NH generated from the decomposition of NH Cl at high temperatures can be adsorbed onto the catalyst which promotes the reaction. The aggregated V O were partially re-dispersed during the regeneration process, and the intrinsic oxidation of ammonia with high concentrations of O is a factor that suppresses the catalytic activity.

关键词： V₂O₅-WO₃/TiO₂ catalysts thermal deactivation regeneration NH₄Cl dilute H₂SO₄ solution

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面向生物医学临床应用的激光微加工功能表面 Article

胡国庆, 管凯, 卢立斌, 张佳茹, 聂璐, 管迎春

《工程（英文）》 2018年第4卷第6期页码 822-830 doi: 10.1016/j.eng.2018.09.009

摘要：激光微加工是一种增强材料表面性能的先进技术，本文系统验证、展示激光微加工医用金属生物材料镁合金和钛合金的可行性，阐述其在细胞黏附和液体活检的应用前景。实验结果表明，细胞在激光微加工表面黏附性能好，并可沿预先设计结构方向生长。此外，激光功能表面可显著增强拉曼信号，增强因子可达6×10³ 以上。

关键词：激光微加工功能表面金属合金生物相容性表面增强拉曼散射

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人体胃肠道–菌群相互作用的工程学研究模型

Marc Mac Giolla Eain, Joanna Baginska, Kacy Greenhalgh, Joëlle V.

《工程（英文）》 2017年第3卷第1期页码 60-65 doi: 10.1016/J.ENG.2017.01.011

摘要：这些系统结合了微型工程、微流体和细胞培养的优点，来创建人类肠道中普遍存在的环境条件。

关键词：微生物微流体肠道芯片 HuMiX

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汽车用非调质钢的研究进展

陈蕴博,马鸣图,王国栋

《中国工程科学》 2014年第16卷第2期页码 4-17

摘要：探讨了非调质钢的强韧化机理及手段，并从非调质钢强化方程、微合金元素固溶度积方程、晶内铁素体强化、控轧-控冷技术等方面阐述了非调质钢强韧化的研究动向。

关键词：非调质钢开发与应用微合金化强化原理

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Zinc modification of Ni-Ti as efficient NiZnTi catalysts with both geometric and electronic improvements

《化学科学与工程前沿（英文）》 2022年第16卷第4期页码 461-474 doi: 10.1007/s11705-021-2072-8

摘要： The catalytic hydrogenation of nitroaromatics is an environmentally friendly technology for aniline production, and it is crucial to develop noble-metal-free catalysts that can achieve chemoselective hydrogenation of nitroaromatics under mild reaction conditions. In this work, zinc-modified Ni-Ti catalysts (Ni_xZn_yTi₁) were fabricated and applied for the hydrogenation of nitroaromatics hydrogenation. It was found that the introduction of zinc effectively increases the surface Ni density, enhances the electronic effect, and improves the interaction between Ni and TiO₂, resulting in smaller Ni particle size, more oxygen vacancies, higher dispersion and greater concentration of Ni on the catalyst surface. Furthermore, the electron-rich Ni^δ^– obtained by electron transfer from Zn and Ti to Ni effectively adsorbs and dissociates hydrogen. The results reveal that Ni_xZn_yTi₁ (Ni_0.5Zn_0.5Ti₁) shows excellent catalytic performance under mild conditions (70 °C and 6 bar). These findings provide a rational strategy for the development of highly active non-noble-metal hydrogenation catalysts.

关键词： bimetal strategy oxygen vacancy non-noble metal catalyst hydrogenation aromatic nitro compounds

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配位不饱和Au-O-Ti³⁺活性位点的构建及其在低温丙烯气相环氧化反应中强化氢气效率的研究 Article

宋钊宁, 闫昊, 袁俊聪, 马宏飞, 曹建琳, 王永祥, 王强, 彭冲, 邓风, 冯翔, 陈德, 杨朝合, 胡永康

《工程（英文）》 2023年第25卷第6期页码 144-156 doi: 10.1016/j.eng.2023.01.008

摘要：

自1998年以来，人们广泛认为Au/Ti基催化剂的Au-O-Ti⁴⁺位点是在相对高温条件下丙烯气相环氧化反应的活性位点，但该类催化剂的H₂有效利用率普遍较低本工作发现了一种在相对低温条件下丙烯气相环氧化反应的新活性位点Au-O-Ti³⁺。并且利用原位紫外-可见光谱（operando UV-vis）技术研究了Ti-OOH反应中间体的动态演化过程，结果表明，在Au-O-Ti³⁺活性位点上的Ti-OOH的生成速率比在Au-O-TiTi³⁺位点促进了Au和Ti³⁺之间的电子转移，从而增强了催化剂对O₂的吸附能力，有效促进H₂O₂的原位生成，并进一步促进活性中间体Ti-OOH的形成。

关键词：丙烯环氧化 H₂有效利用率 Au/Ti双功能催化剂配位不饱和Ti位点密度泛函理论

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Ti incorporation in MCM-41 mesoporous molecular sieves using hydrothermal synthesis

Shengping WANG, Changqing MA, Yun SHI, Xinbin MA

《化学科学与工程前沿（英文）》 2014年第8卷第1期页码 95-103 doi: 10.1007/s11705-014-1405-2

摘要： Titanium-containing mesoporous materials (Ti-MCM-41) were obtained by hydrothermal synthesis. Such materials are active catalysts for the transesterification of dimethyl oxalate and phenol to produce diphenyl oxalate. To understand the role of the Ti in the catalytic process, Ti-MCM-41 samples with different Si/Ti ratios (from 5 to 100) were prepared and the samples were analyzed by Fourier transform infrared spectroscopy, UV-visible spectroscopy, and ammonia temperature programmed desorption. It was concluded that the Ti is incorporated into the framework of the MCM-41 and formed weak Lewis acid sites. In addition, the number of Ti(IV) sites increased as the amount of titanium increased. X-ray powder diffraction, N adsorption-desorption and transmission electron microscopy results showed that the Ti-MCM-41 samples have a hexagonal arrangement of mono-dimensional pores. A large number of Ti(IV) sites coupled with the mesoporous structure and large pore diameters are favorable for the transesterification catalytic properties of Ti-MCM-41.

关键词： Ti-MCM-41 mesoporous molecular sieve acid sites transesterification hydrothermal synthesis

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Autoimmunity in acute ischemic stroke and the role of blood—brain barrier: the dark side or the light one?

Nikolay V. Tsygan, Alexandr P. Trashkov, Igor V. Litvinenko, Viktoriya A. Yakovleva, Alexandr V.

《医学前沿（英文）》 2019年第13卷第4期页码 420-426 doi: 10.1007/s11684-019-0688-6

摘要： This article presents a synopsis of the current data on the mechanisms of blood—brain barrier (BBB) alteration and autoimmune response in acute ischemic stroke. Most researchers confirm the relationship between the severity of immunobiochemical changes and clinical outcome of acute ischemic stroke. Ischemic stroke is accompanied by aseptic inflammation, which alters the brain tissue and exposes the co-stimulatory molecules of the immune system and the neuronal antigens. To date, BBB is not considered the border between the immune system and central nervous system, and the local immune subsystems are found within and behind the BBB. BBB disruption contributes to the leakage of brain autoantigens and induction of secondary autoimmune response to neuronal antigens and long-term inflammation. Glymphatic system function is altered and jeopardized both in hemorrhagic and ischemic stroke types. The receptors of innate immunity (toll-like receptor-2 and toll-like receptor-4) are also involved in acute ischemia—reperfusion injury. Immune response is related to the key processes of blood clotting and fibrinolysis. At the same time, the stroke-induced immune activation may promote reparation phenomena in the brain. Subsequent research on the reduction of the acute ischemic brain injury through the target regulation of the immune response is promising.

关键词： stroke blood–brain barrier autoimmunity innate immunity inflammation cell death

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Effects of Boundary Condition and Helix Angle on Meshing Performance of TI Worm Gearing

SUN Yue-hai, DUAN Lu-qian, WANG Shu-ren, ZHANG Ce

《机械工程前沿（英文）》 2006年第1卷第1期页码 90-95 doi: 10.1007/s11465-005-0006-7

摘要：

To exactly describe the contact state and contact area of tooth surface of toroidal involute (TI) worm gearing, the authors introduced boundary condition into contact line analysis.With helix angle chosen as parameter, the criterion for the existence of meshing boundary line on the surface of TI worm gearing is derived. Results show that there can be four situations for meshing boundary line on the tooth surface of gear, namely, inexistence of meshing boundary line, a unique line, two lines, and two coincident lines. If the helix angle is equal to or slightly smaller than the bigger angle, which makes two meshing boundary lines superpose, a preferable meshing performance is obtained. Computer simulation proves the validity of the above conclusion.

关键词： preferable inexistence Results validity boundary condition

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Facile controlled synthesis of hierarchically structured mesoporous Li4Ti5O12/C/rGO composites as high-performance

Cehuang FU, Shuiyun SHEN, Ruofei WU, Xiaohui YAN, Guofeng XIA, Junliang ZHANG

《能源前沿（英文）》 2022年第16卷第4期页码 607-612 doi: 10.1007/s11708-021-0798-0

摘要： In this paper, a facile strategy is proposed to controllably synthesize mesoporous Li₄Ti₅O₁₂/C nanocomposite embedded in graphene matrix as lithium-ion battery anode via the co-assembly of Li₄Ti₅O₁₂ (LTO) precursor, GO, and phenolic resin. The obtained composites, which consists of a LTO core, a phenolic-resin-based carbon shell, and a porous frame constructed by rGO, can be denoted as LTO/C/rGO and presents a hierarchical structure. Owing to the advantages of the hierarchical structure, including a high surface area and a high electric conductivity, the mesoporous LTO/C/rGO composite exhibits a greatly improved rate capability as the anode material in contrast to the conventional LTO electrode.

关键词： Li₄Ti₅O₁₂ phenolic-resin-based carbon mesoporous composite graphene