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Anthocyanins/chitosan films doped by nano zinc oxide for active and intelligent packaging: comparison

《化学科学与工程前沿（英文）》 2023年 第17卷 第6期   页码 704-715 doi: 10.1007/s11705-022-2270-z

摘要： The multifunctional films was prepared by blending chitosan and nano-ZnO with purple tomato anthocyanins or black wolfberry anthocyanins. The properties of films functioned by anthocyanins source and nano-ZnO content were studied. It was found purple tomato anthocyanins showed more significant color change against pH than black wolfberry anthocyanins. The nano-ZnO were widely dispersed in matrix and enhanced the compatibility of anthocyanins with chitosan. However, the anthocyanins source influenced the properties of the films more slightly than nano-ZnO addition. The tensile strength, antioxidant and antibacterial effects of the chitosan films dramatically increased after cooperated by nano-ZnO and anthocyanins, which also enhanced with increase of nano-ZnO content, whereas the elongation at break of the composite films decreased. Especially, the anthocyanin and nano-ZnO promoted the antibacterial activity of films synergistically. Composite films made from black wolfberry anthocyanins exhibited higher mechanical performance than those made from purple tomato anthocyanins but weaker antibacterial effects. The purple tomato anthocyanins/chitosan and nano-ZnO/purple tomato anthocyanins/chitosan films effectively reflected pork spoilage, changing their colors from dark green to brown, indicating the potential for applications in active and intelligent food packaging.

关键词： bio-based     multifunction     colorimetric indicator     active and intelligent packaging    

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ENVIRONMENTAL ATTITUDES AND CONSUMER PREFERENCE FOR ENVIRONMENTALLY-FRIENDLY BEVERAGE PACKAGING: THE

《农业科学与工程前沿（英文）》 2023年 第10卷 第1期   页码 95-108 doi: 10.15302/J-FASE-2022478

摘要：

● Consumer preference for environmentally-friendly beverage packaging was investigated.

关键词： China     consumer preference     food and beverage packaging     green identity label     information treatment     plastics    

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Thermal and catalytic pyrolysis of a synthetic mixture representative of packaging plastics residue

Simona Colantonio, Lorenzo Cafiero, Doina De Angelis, Nicolò M. Ippolito, Riccardo Tuffi, Stefano Vecchio Ciprioti

《化学科学与工程前沿（英文）》 2020年 第14卷 第2期   页码 288-303 doi: 10.1007/s11705-019-1875-3

摘要： A synthetic mixture of real waste packaging plastics representative of the residue from a material recovery facility (plasmix) was submitted to thermal and catalytic pyrolysis. Preliminary thermogravimetry experiments coupled with Fourier transform infrared spectroscopy were performed to evaluate the effects of the catalysts on the polymers’ degradation temperatures and to determine the main compounds produced during pyrolysis. The thermal and catalytic experiments were conducted at 370°C, 450°C and 650°C using a bench scale reactor. The oil, gas, and char yields were analyzed and the compositions of the reaction products were compared. The primary aim of this study was to understand the effects of zeolitic hydrogen ultra stable zeolite Y (HUSY) and hydrogen zeolite socony mobil-5 (HZSM5) catalysts with high silica content on the pyrolysis process and the products’ quality. Thermogravimetry showed that HUSY significantly reduces the degradation temperature of all the polymers—particularly the polyolefines. HZSM5 had a significant effect on the degradation of polyethylene due to its smaller pore size. Mass balance showed that oil is always the main product of pyrolysis, regardless of the process conditions. However, all pyrolysis runs performed at 370°C were incomplete. The use of either zeolites resulted in a decrease in the heavy oil fraction and the prevention of wax formation. HUSY has the best performance in terms of the total monoaromatic yield (29 wt-% at 450°C), while HZSM5 promoted the production of gases (41 wt-% at 650°C). Plasmix is a potential input material for pyrolysis that is positively affected by the presence of the two tested zeolites. A more effective separation of polyethylene terephthalate during the selection process could lead to higher quality pyrolysis products.

关键词： packaging plastics waste     plasmix     pyrolysis     zeolite catalyst     degradation temperature    

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面向智能铁路的主动安全保障方法与技术研究 Article

秦勇, 曹志威, 孙永福, 寇淋淋, 赵雪军, 吴云鹏, 柳青红, 王铭铭, 贾利民

《工程（英文）》 2023年 第27卷 第8期   页码 266-279 doi: 10.1016/j.eng.2022.06.025

摘要：

安全是“交通强国”国家战略实施的前提和基础。目前，世界范围内的铁路系统已将智能铁路作为重要发展方向之一，智能铁路在追求实现高效、便捷、经济、绿色等发展目标的同时，将安全作为铁路运输系统的核心竞争力和第一要务。本文阐述了智能铁路系统的发展现状和体系架构，在此基础上重点介绍了国内外铁路系统安全保障技术的发展趋势，总结并提出了基于实时数据驱动、智能计算、信息物理系统深度融合等先进理念的主动安全保障方法技术体系；最后，通过典型应用研究展示了铁路主动安全保障技术的先进性和可行性。

关键词： 智能铁路     主动安全方法论     设备设施健康管理     智能环境感知     运维风险调控    

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用于微电子机械系统封装的体硅键合技术和薄膜密封技术

王渭源,王跃林

《中国工程科学》 2002年 第4卷 第6期   页码 56-62

摘要：

对静电键合、体硅直接键合和界面层辅助键合等三种体硅键合技术，整片操作、局部操作和选择保护等三种密封技术，以及这些技术用于微电子机械系统的密封作了评述，强调在器件研究开始时应考虑封装问题，具体技术则应在保证器件功能和尽量减少芯片复杂性两者之间权衡决定。

关键词： 体硅键合技术     薄膜密封技术     微电子机械系统封装技术    

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基于玻璃通孔的Ka波段宽带滤波封装天线 Research Article

方针1,2,张继华1,2,3,高莉彬1,2,陈宏伟1,2,李文磊1,2,梁天鹏1,2,蔡旭东1,2,蔡星周3,贾惟聪3,郭欢3,李勇3

《信息与电子工程前沿（英文）》 2023年 第24卷 第6期   页码 916-926 doi: 10.1631/FITEE.2200573

摘要： 以玻璃封装材料和玻璃通孔技术为基础，提出一种新的Ka波段(33 GHz)滤波封装天线(FPA)，该天线具有宽频带和高滤波响应特点。与传统封装材料(印刷电路板、低温共烧陶瓷、硅等)相比，玻璃通孔更适合小型化技术(毫米波三维封装器件)，具有优越的微波性能。玻璃基板通过键合技术可实现三维高密度互联，其热膨胀系数与硅相当。此外，玻璃基板的堆叠实现了高密度互连，并与微电子技术兼容。该天线辐射贴片由贴片天线和反射系数几乎互补的带通滤波器(BPF)组成。BPF单元有3对λg/4槽(缺陷微带结构)和两对λg/2 U形缝隙(缺陷地结构)。该天线实现了大带宽和高辐射效率，这可能与玻璃基板的叠加和玻璃通孔馈电有关。此外，引入4个辐射零值可有效提高阻带内的抑制水平。为验证所提设计性能，对33 GHz宽带滤波天线进行优化、调试和测量。天线的工作带宽为29.4‒36.4 GHz (|S11|<−10 dB)，阻抗匹配带宽高达21.2%，阻带抑制水平大于16.5 dB。该天线实际增益为~6.5 dBi，辐射效率为~89%。

关键词： 滤波封装天线；玻璃通孔；三维封装器件；激光键合    

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The road to sustainable use and waste management of plastics in Portugal

《环境科学与工程前沿（英文）》 2022年 第16卷 第1期   页码 5-5 doi: 10.1007/s11783-021-1439-x

摘要：

• Portugal recycles 34% of the 40 kg/hab year of plastic packaging waste.

关键词： Single-use plastics     Plastic packaging     Plastic waste     Waste management     Waste shipment     Lightweight plastic bags    

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advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active

《结构与土木工程前沿（英文）》 doi: 10.1007/s11709-023-0966-x

摘要： Based on significant improvements in engineering materials, three advanced engineering measures have been proposed—super anchor cables, high-strength concrete anti-fault caverns, and grouting modification using high-strength concrete-to resist fault dislocation in the surrounding rock near tunnels crossing active strike-slip faults. Moreover, single- or multiple-joint advanced engineering measures form the local rock mass-anti-fault (LRAF) method. A numerical method was used to investigate the influence of LRAF methods on the stress and displacement fields of the surrounding rock, and the anti-fault effect was evaluated. Finally, the mechanism of action of the anchor cable was verified using a three-dimensional numerical model. The numerical results indicated that the anchor cable and grouting modification reduced the displacement gradient of the local surrounding rock near the tunnels crossing fault. Furthermore, anchor cable and grouting modifications changed the stress field of the rock mass in the modified area. The tensile stress field of the rock mass in the modified anchor cable area was converted into a compressive stress field. The stress field in the modified grouting area changed from shear stress in the fault slip direction to tensile stress in the axial tunnel direction. The anti-fault cavern resisted the dislocation displacement and reduced the maximum dislocation magnitude, displacement gradient, and shear stress. Among the three advanced engineering measures, the anchor cable was the core of the three advanced engineering measures. An anchor cable, combined with other LRAF measures, can form an artificial safety island at the cross-fault position of the rock mass to protect the tunnel. The research results provide a new supporting idea for the surrounding rock of tunnels crossing active strike-slip faults.

关键词： anti-fault effect     engineering measures     LRAF method     stress and displacement field     tunnel-crossing active faults    

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The electrostatic-alloy bonding technique used in MEMS

WANG Wei, CHEN Wei-ping

《机械工程前沿（英文）》 2006年 第1卷 第2期   页码 238-241 doi: 10.1007/s11465-006-0011-5

摘要： Electrostatic-alloy bonding of silicon wafer with glass deposited by Au to form Si/Au-glass water, and bonding of Si/Au-glass with silicon wafer were researched during fabrication of pressure sensors. The silicon wafer and glass wafer with an Au film resistor were bonded by electrostatic bonding, and then Si-Au alloy bonding was formed by annealing at 400vH for 2 h. The air sealability of the cavity after bonding was finally tested using the N filling method. The results indicate that large bond strength was obtained at the bonding interface. This process was used in fabricating a pressure sensor with a sandwich structure. The results indicate that the sensor presented better performances and that the bonding techniques can be used in MEMS packaging.

关键词： Si/Au-glass     strength     MEMS packaging     process     sandwich structure    

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Solid-state NMR for metal-containing zeolites: From active sites to reaction mechanism

Xingling Zhao, Jun Xu, Feng Deng

《化学科学与工程前沿（英文）》 2020年 第14卷 第2期   页码 159-187 doi: 10.1007/s11705-019-1885-1

摘要： Metal-containing zeolite catalysts have found a wide range of applications in heterogeneous catalysis. To understand the nature of metal active sites and the reaction mechanism over such catalysts is of great importance for the establishment of structure-activity relationship. The advanced solid-state NMR (SSNMR) spectroscopy is robust in the study of zeolites and zeolite-catalyzed reactions. In this review, we summarize recent developments and applications of SSNMR for exploring the structure and property of active sites in metal-containing zeolites. Moreover, detailed information on host-guest interactions in the relevant zeolite catalysis obtained by SSNMR is also discussed. Finally, we highlight the mechanistic understanding of catalytic reactions on metal-containing zeolites based on the observation of key surface species and active intermediates.

关键词： metal-containing zeolites     solid-state NMR     active site     host-guest interaction     reaction mechanism    

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Advances in Active Suspension Systems for Road Vehicles

Min Yu,Simos Evangelou,Daniele Dini,

《工程（英文）》 doi: 10.1016/j.eng.2023.06.014

摘要： Active suspension systems (ASSs) have been proposed and developed for a few decades, and have now once again become a thriving topic in both academia and industry, due to the high demand for driving comfort and safety and the compatibility of ASSs with vehicle electrification and autonomy. Existing review papers on ASSs mainly cover dynamics modeling and robust control; however, the gap between academic research outcomes and industrial application requirements has not yet been bridged, hindering most ASS research knowledge from being transferred to vehicle companies. This paper comprehensively reviews advances in ASSs for road vehicles, with a focus on hardware structures and control strategies. In particular, state-of-the-art ASSs that have been recently adopted in production cars are discussed in detail, including the representative solutions of Mercedes active body control (ABC) and Audi predictive active suspension; novel concepts that could become alternative candidates are also introduced, including series active variable geometry suspension, and the active wheel-alignment system. ASSs with compact structure, small mass increment, low power consumption, high-frequency response, acceptable economic costs, and high reliability are more likely to be adopted by car manufacturers. In terms of control strategies, the development of future ASSs aims not only to stabilize the chassis attitude and attenuate the chassis vibration, but also to enable ASSs to cooperate with other modules (e.g., steering and braking) and sensors (e.g., cameras) within a car, and even with high-level decision-making (e.g., reference driving speed) in the overall transportation system—strategies that will be compatible with the rapidly developing electric and autonomous vehicles.

关键词： Active suspension     Vehicle dynamics     Robust control     Ride comfort     Chassis attitude    

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An antibiotic composite electrode for improving the sensitivity of electrochemically active biofilm biosensor

《环境科学与工程前沿（英文）》 2022年 第16卷 第8期 doi: 10.1007/s11783-022-1518-7

摘要：

• Antibiotic azithromycin employed in graphite electrode for EAB biosensor.

关键词： AZM@GP composite electrode     EAB-biosensor     Water quality early-warning    

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Upper bound solution to seismic active earth pressure of submerged backfill subjected to partial drainage

《结构与土木工程前沿（英文）》 2021年 第15卷 第6期   页码 1480-1493 doi: 10.1007/s11709-021-0776-y

摘要： In waterfront geotechnical engineering, seismic and drainage conditions must be considered in the design of retaining structures. This paper proposes a general analytical method to evaluate the seismic active earth pressure on a retaining wall with backfill subjected to partial steady seepage flow under seismic conditions. The method comprises the following steps: i) determination of the total head, ii) upper bound solution of seismic active earth thrust, and iii) deduction for the earth pressure distribution. The determination of total head h(x,z) relies on the Fourier series expansions, and the expressions of the seismic active earth thrust and pressure are derived by using the upper bound theorem. Parametric studies reveal that insufficient drainage and earthquakes are crucial factors that cause unfavorable earth pressure. The numerical results confirm the validity of the total head distribution. Comparisons indicate that the proposed method is consistent with other relevant existing methods in terms of predicting seismic active earth pressure. The method can be applied to the seismic design of waterfront retaining walls.

关键词： seismic active earth pressure     partial seepage flow     pore pressure     anisotropy     upper bound theorem    

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Optimal Timing and Recycling Operation Mode for Electro-Mechanical Products Active Remanufacturing

Wang Gao,Tao Li,Shi-tong Peng,Liang Wang,Hong-chao Zhang

《工程管理前沿（英文）》 2016年 第3卷 第2期   页码 115-122 doi: 10.15302/J-FEM-2016019

摘要： The uncertainties of remanufactured products in multi-life cycle service, such as injury and restoration process route, are comprehensively analyzed in the present study from perspectives of cost and the environment. Based on life cycle assessment method and the life cycle cost analysis, the optimal timing model of active remanufacturing for electro-mechanical products is established considering these uncertainties. In addition, regarding the active remanufacturing as its guidance, this study explores the economic efficiency and corresponding operation mode of electro-mechanical products when recycling in the optimal timing. To validate the optimal timing model for electro-mechanical products active remanufacturing, a specific type of product is taken as a case study with mathematical statistics method and Monte Carlo simulation.

关键词： electro-mechanical products     active remanufacturing     optimal timing     reverse logistics     recycling mode    

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基于特征模型的全系数自适应磁悬浮储能飞轮控制算法鲁棒性研究 None

Xujun LYU, Long DI, Zongli LIN

《信息与电子工程前沿（英文）》 2019年 第20卷 第1期   页码 120-130 doi: 10.1631/FITEE.1800606

摘要： 基于特征模型的全系数自适应控制算法最近在一个磁悬浮轴承支承的高速储能飞轮实验平台实现。该控制算法是一个智能控制算法，它的设计不依赖于对象的数学模型，但能在控制过程中在线辨识特征模型。大量数值仿真和实验结果表明，此智能控制算法控制效果比原有μ综合控制算法更好，该μ综合控制算法最初在高速实验台上根据其抑制振动能力设计。大量仿真进一步证实此智能控制算法在考虑模型不确定性、外界扰动以及时滞情况下具有相当强鲁棒性。

关键词： 智能控制；鲁棒性；不确定性；抗干扰；主动磁悬浮轴承；储能飞轮    

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标题 作者 时间 类型 操作

Anthocyanins/chitosan films doped by nano zinc oxide for active and intelligent packaging: comparison

期刊论文

ENVIRONMENTAL ATTITUDES AND CONSUMER PREFERENCE FOR ENVIRONMENTALLY-FRIENDLY BEVERAGE PACKAGING: THE

期刊论文

Thermal and catalytic pyrolysis of a synthetic mixture representative of packaging plastics residue

Simona Colantonio, Lorenzo Cafiero, Doina De Angelis, Nicolò M. Ippolito, Riccardo Tuffi, Stefano Vecchio Ciprioti

期刊论文

面向智能铁路的主动安全保障方法与技术研究

秦勇, 曹志威, 孙永福, 寇淋淋, 赵雪军, 吴云鹏, 柳青红, 王铭铭, 贾利民

期刊论文

用于微电子机械系统封装的体硅键合技术和薄膜密封技术

王渭源,王跃林

期刊论文

基于玻璃通孔的Ka波段宽带滤波封装天线

方针1,2,张继华1,2,3,高莉彬1,2,陈宏伟1,2,李文磊1,2,梁天鹏1,2,蔡旭东1,2,蔡星周3,贾惟聪3,郭欢3,李勇3

期刊论文

The road to sustainable use and waste management of plastics in Portugal

期刊论文

advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active

期刊论文

The electrostatic-alloy bonding technique used in MEMS

WANG Wei, CHEN Wei-ping

期刊论文

Solid-state NMR for metal-containing zeolites: From active sites to reaction mechanism

Xingling Zhao, Jun Xu, Feng Deng

期刊论文

Advances in Active Suspension Systems for Road Vehicles

Min Yu,Simos Evangelou,Daniele Dini,

期刊论文

An antibiotic composite electrode for improving the sensitivity of electrochemically active biofilm biosensor

期刊论文

Upper bound solution to seismic active earth pressure of submerged backfill subjected to partial drainage

期刊论文

Optimal Timing and Recycling Operation Mode for Electro-Mechanical Products Active Remanufacturing

Wang Gao,Tao Li,Shi-tong Peng,Liang Wang,Hong-chao Zhang

期刊论文

基于特征模型的全系数自适应磁悬浮储能飞轮控制算法鲁棒性研究

Xujun LYU, Long DI, Zongli LIN

期刊论文