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Functional microfluidics:theory,microfabrication,and applications

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International Journal of Extreme Manufacturing 2024年第3期6卷 140-173页

作者： Mingzhu Xie Ziheng zhan.Yinfeng Li Junkai Zhao ce zhan. Zhaolong Wang Zuankai Wang Interdisciplinary Research center of Low-carbon Technology and Equipment College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082People’s Republic of China Energy Research Institute of Shandong Academy of Sciences Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014People’s Republic of China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology(CAST)Beijing 100094People’s Republic of China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHong Kong Special Administrative Region of China 999077People’s Republic of China

Microfluidic devices are composed of microchannels with a diameter ranging from ten to a few hundred ***,quite a small(10-9–10-18l)amount of liquid can be manipulated by such a precise *** the past three decades,significant progress in materials science,microfabrication,and various applications has boosted the development of promising functional microfluidic *** this review,the recent progress on novel microfluidic devices with various functions and applications is ***,the theory and numerical methods for studying the performance of microfluidic devices are briefly ***,materials and fabrication methods of functional microfluidic devices are ***,the recent significant advances in applications of microfluidic devices are highlighted,including heat sinks,clean water production,chemical reactions,sensors,biomedicine,capillaric circuits,wearable electronic devices,and ***,perspectives on the challenges and future developments of functional microfluidic devices are *** review aims to inspire researchers from various fields engineering,materials,chemistry,mathematics,physics,and more—to collaborate and drive forward the development and applications of functional microfluidic devices,specifically for achieving carbon neutrality.

关键词： capillary theory functional devices functional microfluidics

Temporal and Spectral Characteristics of Persistent Emission and Special Bursts of Magnetar SGR J1935+2154 Based on Insight-HXMT

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Research in Astronomy and Astrophysics 2024年第6期24卷 225-233页

作者： Xue-Feng Lu Li-Ming Song Ming-Yu Ge Shuang-Nan zhan. Jin-Lu Qu ce Cai Cong-zhan.Liu Cheng-Kui Li Yu-Cong Fu Ying-Chen Xu Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang 050024China Department of Astronomy Beijing Normal UniversityBeijing 100875China

In October 2022,the magnetar SGR J1935+2154 entered the active outburst *** the episode,the InsightHXMT satellite carried out a long observation that lasted for 20 *** than 300 bursts were detected,and a certain amount of persistent radiation signals were also *** paper mainly introduces the results of persistent radiation profile folding and period search based on Insight-HXMT *** the same time,the burst phase distribution characteristics,spectral lag results of burst,the spectral characteristics of zero-lag bursts and the time-resolved spectral evolution characteristics of high-flux bursts are *** found that there is no significant delay feature during different energy bands for the bursts of SGR J1935+*** observed zero-lag burst does not have a unique *** time-resolved spectrum of the individual burst has consistent spectral types and spectral parameters at different time periods of the *** also find that the burst number phase distribution and the burst photon phase distribution have the same tendency to concentrate in specific regions of the persistent emission profile.

关键词： radiation mechanisms:general dense matter magnetic fields

Effect of Al content on modification behavior of non-metallic inclusions in high-strength steel treated with rare earth

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Journal of Iron and Steel Research International 2024年第8期31卷 1886-1899页

作者： zhan.peng Tie Xue-yuan Jiang Hai-yan Tang ·Gen Li Yu-hang Wang Jia-quan zhan. School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Continuous Casting Business Section CISDI Engineering Co.Ltd.Chongqing 401122China Special Steel Institute Central Iron and Steel Research Institute Co.Ltd.Beijing 100081China

The influence of Al content(0.0053,0.0171,and 0.0578 wt.%)on the modification behavior of non-metallic inclusions in 20CrMoVTiB steel treated with rare earth elements was studied through high-temperature experiments and thermodynamic *** results showed that the modification products varied with the Al content in steel under 0.01 wt.%of ce *** formation sequence of typical rare earth inclusions in steel with the increase in Al content was ce_(2)O_(3)→ceAlO_(3)→ceAl_(11)O_(18),and the final stable products were highly Al content *** the Al content was 0.0053 wt.%,the stable phase in steel was ce2O3;while the[Al]reached 0.0171 wt.%,the stable phase became ceA1O_(3).As the A1 content reached 0.0578 wt.%,ceAl_(11)O_(18) became the stable *** a result,increasing the Al content could inhibit the precipitation of ce_(2)O_(3) inclusions in steel while promote the formation of ceAIO3 and ceAl_(11)O_(18) *** addition,both Ca treatment and ce treatment could effectively refine the size of inclusions in steel by changing their ***,the feeding amount of Ca wire into molten steel should be appropriately reduced under the condition of adding ce simultaneously,which is expected to be beneficial for an improved ce treatment effect.

关键词： Rare earth Al content Steel Inclusion Thermodynamics Ca treatment

Influence of cerium and yttrium addition on strength and electrical conductivity of pure aluminum alloys

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Journal of Rare Earths 2024年第3期42卷 600-611,I0006页

作者： Guojian Lin Lu Li Zhengwei Guo Xianjun Jia Xiao Wang Zhentao Yuan Guoxing zhan. Yun zhan.Quan Shan Zulai Li Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China Research center for Analysis and Measurement Kunming University of Science and TechnologyKunming650093China City College Kunming University of Science and TechnologyKunming650051China

To develop pure aluminum alloys with high conductivity and strength, Al-0.2ce and Al-0.2ce-0.1Y alloys were prepared by rolling and annealing processes in this study. The effects of trace rare earth elements on the strength and electrical conductivity of the pure aluminum alloys were investigated. It is revealed that the addition of ce and Y to pure aluminum can effectively enhance the strength and electrical conductivity of the alloys. In Al-0.2ce, the addition of ce can effectively refine the grain size of a-Al, with an average grain size of 90.68 μm in the as-cast state. The grain size of the alloy is further reduced to 87.55 μm by the simultaneous addition of Y. The synergistic addition of ce and Y changes the properties of the alloy. The addition of ce and Y also produces the Al_(11)ce_(3) and Al_(3)Y second phases, which have coherent relationship with a-Al. The two-dimensional mismatch degree was calculated to be only 4.43%and 0.85%, respectively, which can provide a certain amount of nucleation substrate for a-Al in the incubation stage. The interfacial match between the L1_(2)structure of Al_(3)Y and a-Al was calculated using first-principles simulations. The results indicate that Al_(3)Y has a strong bonding effect with a-Al. Nanoscale second phases at grain boundaries can be effective in reducing resistivity due to dislocation *** second phases with better matching interfaces to the substrate have no positive effect on the scattering motion of electrons.

关键词： Pure aluminum Rare earths Impurity purification First-principles calculations Strength-conductivity contradiction

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开式空气循环热泵干燥系统性能仿真分析

制冷学报 2024年第2期45卷 101-108页

作者：战斌飞王智超孙郁徐策邵双全徐昭炜杨英霞建筑安全与建筑环境国家重点实验室北京100013 中国建筑科学研究院有限公司北京100013 中国科学院低温工程学重点实验室中国科学院理化技术研究所北京100190 华中科技大学能源与动力工程学院武汉430074

为解决能源使用效率低、HCFC/HFC等非环保制冷剂使用等问题,提出了不同于传统干燥技术的以空气为工质的空气循环热泵干燥(ACHPD)系统新技术。建立了数学仿真模型,通过所构建实验台的实验结果进行验证,干燥速率误差在±0.01%以内,系统功... 详细信息

为解决能源使用效率低、HCFC/HFC等非环保制冷剂使用等问题,提出了不同于传统干燥技术的以空气为工质的空气循环热泵干燥(ACHPD)系统新技术。建立了数学仿真模型,通过所构建实验台的实验结果进行验证,干燥速率误差在±0.01%以内,系统功率误差在±7%以内。与传统的电加热器干燥(EHD)系统相比,当水质量蒸发率从0.75 kg/h增至3.45 kg/h时,ACHPD系统的节能率达到15%~27%。进气温度由10℃增至40℃和相对湿度由30%增至80%分别使单位除湿能效比(MER)降低约7%和21%。膨胀机效率由0.55增至0.8和压缩机效率由0.4增至0.9会使系统的能效分别降低17%和36%。

关键词：开式循环空气循环热泵干燥系统

Structural whiteness of the multi-component glaze dependence on amorphous photonic crystals

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Frontiers of Materials Science 2019年第2期13卷 206-215页

作者： Hongquan zhan.Chuanqi WU ce DENG Xiaohong LI Zhipeng XIE Changan WANG School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001 China State Key Lab of New ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

A kind of enhancing mechanism of structural whiteness dependence on amorphous photonic crystal (APC) structure is introduced in this paper. In the glaze system composed of albite, kaolin, talc, calcite, quartz, titanium dioxide and zinc oxide, the APC structure will be produced by using quartz as a variable to induce the phase separation. Under different polarities between Ti, Zn etc. and Siion, the separated spheres with the core-shell structure can be obtained and then make up opal-like APCs in the glaze layer. In addition to inner and outer layers of core-shell spheres, the calculated results of refractive indices clearly show the great difference between the particles and the matrix. As a result of different refractive indices, the multiple scatting of visible light plays a key rote in the structural whiteness. However, due to the decrease of the cationic content, APCs with the reverse opal structure would be formed in the interface between glaze and body. Ultimately, the glaze appearance reveals extremely high structural whiteness due to the special APC structure.

关键词： structural whiteness amorphous photonic crystal core-shell structure

石墨烯基介孔锰铈氧化物催化剂:制备和低温催化还原NO

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无机材料学报 2024年第1期39卷 81-89,I0005页

作者：王艳莉钱心怡沈春银詹亮华东理工大学化工学院化学工程联合国家重点实验室上海200237

锰铈氧化物由于较强的氧化还原活性、优良的低温脱硝性能,已被广泛用于选择性催化还原(SCR)脱硝反应,但是锰铈氧化物存在活性组分易团聚、比表面积较低等问题,限制其催化剂活性的提高。本研究以介孔结构的石墨烯基SiO_(2)(G@SiO_(2))纳... 详细信息

锰铈氧化物由于较强的氧化还原活性、优良的低温脱硝性能,已被广泛用于选择性催化还原(SCR)脱硝反应,但是锰铈氧化物存在活性组分易团聚、比表面积较低等问题,限制其催化剂活性的提高。本研究以介孔结构的石墨烯基SiO_(2)(G@SiO_(2))纳米材料为模板,采用水热法制备了系列石墨烯基介孔锰铈氧化物(G@MnO_(x)-ceO_(2))催化剂,并考察了该催化剂在低温下(100~300℃)的SCR脱硝性能。结果表明,与石墨烯基铈氧化物(G@ceO_(2))相比,G@MnO_(x)-ceO_(2)催化剂具有较高脱硝活性。当Mn、ce与模板G@SiO_(2)质量比分别为0.35、0.90时,G@Mn(0.35)ce(0.9)催化剂的脱硝活性最佳,220℃下NO转化率达到最高(80%)。添加适量MnO_(x),提高了G@MnO_(x)-ceO_(2)催化剂的比表面积、孔容,降低了催化剂的结晶度;并且MnO_(x)-ceO_(2)以纳米尺度(2~3 nm)较为均匀地分散于石墨烯片层表面。此外,由于MnO_(x)与ceO_(2)之间存在协同作用,Mn原子可以部分替代ce原子掺杂于ceO_(2)的晶体结构中形成MnO_(x)-ceO_(2)固溶体,使G@Mn(0.35)ce(0.9)催化剂表面存在较高含量的高价态Mn^(3+)和Mn^(4+)、ce^(4+)以及较高的化学吸附氧浓度,从而展现出较高的脱硝性能。该工作为MnO_(x)-ceO_(2)基催化剂在低温NH3-SCR中的实际应用提供了基础数据。

关键词：石墨烯铈氧化物锰氧化物 NO 选择性催化还原

上海大都市圈创新网络的演化特征及其对创新产出的影响——基于“蜂鸣—管道”视角

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经济地理 2024年第1期44卷 107-117页

作者：王启轩任婕曹湛同济大学建筑与城市规划学院上海200092 自然资源部国土空间智能规划技术重点实验室上海200092

创新网络的建构与完善对推动区域创新发展具有重要意义。文章采用2010—2019年专利合作数据,以上海大都市圈为对象,借鉴“蜂鸣—管道”模型,构建区县单元间与区县单元内的创新网络,并分析蜂鸣与管道对都市圈内创新产出不均衡的异质性影... 详细信息

创新网络的建构与完善对推动区域创新发展具有重要意义。文章采用2010—2019年专利合作数据,以上海大都市圈为对象,借鉴“蜂鸣—管道”模型,构建区县单元间与区县单元内的创新网络,并分析蜂鸣与管道对都市圈内创新产出不均衡的异质性影响。结果表明:(1)上海大都市圈的创新网络呈现出本地蜂鸣与区域管道相互交织的格局;根据蜂鸣与管道的组合特征,不同区县可分为“网络型”“外向型”“孤岛型”和“内向型”4类。(2)蜂鸣与管道总体上会促进区县单元的创新产出,但过于紧密的蜂鸣和管道则与区县单元创新产出间存在倒“U”型关系。(3)中国的都市圈创新发展要综合考虑不同创新合作模式对创新产出的差异化影响,充分发挥本地与区域创新网络的正外部性,并避免过强蜂鸣与管道带来的负外部性。

关键词：创新网络“ 蜂鸣—管道”模型演化特征专利合作上海大都市圈

面向电力应用经济性评价的超算平台性能评测方法

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自动化应用 2024年第4期65卷 197-200页

作者：龙玉江甘润东王策詹柱刘斌贵州电网有限责任公司信息中心贵州贵阳550000 方心科技股份有限公司湖南长沙410000 湖南省电力算力一体化工程技术研究中心湖南长沙41000

在将电力应用移植到国产超算平台的过程中,迫切需要构建应用软件在超算平台上部署和运维的经济性评价体系,以实现对技术效益和经济效益的综合考量。超算平台自身的性能深刻影响电力应用部署和运维的难易程度,是建立经济性评价体系的前... 详细信息

在将电力应用移植到国产超算平台的过程中,迫切需要构建应用软件在超算平台上部署和运维的经济性评价体系,以实现对技术效益和经济效益的综合考量。超算平台自身的性能深刻影响电力应用部署和运维的难易程度,是建立经济性评价体系的前提基础,因此,需要针对ARM架构的国产超算平台深入开展性能评测研究。首先介绍了超算平台性能评测的基本内涵与基本原则,在此基础上构建了超算平台的综合性能评价体系,最后给出了具体的性能评测方法。

关键词：电力应用经济性评价超算平台性能评测