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Hierarchically porous zeolites synthesized with carbon materials as templates
《化学科学与工程前沿(英文)》 2021年 第15卷 第6期 页码 1444-1461 doi: 10.1007/s11705-021-2090-6
关键词: hierarchical zeolites carbon materials direct templates indirect templates carbon-silica composites
Additive direct-write microfabrication for MEMS: A review
Kwok Siong TEH
《机械工程前沿(英文)》 2017年 第12卷 第4期 页码 490-509 doi: 10.1007/s11465-017-0484-4
Direct-write additive manufacturing refers to a rich and growing repertoire of well-established fabrication techniques that builds solid objects directly from computer-generated solid models without elaborate intermediate fabrication steps. At the macroscale, direct-write techniques such as stereolithography, selective laser sintering, fused deposition modeling ink-jet printing, and laminated object manufacturing have significantly reduced concept-to-product lead time, enabled complex geometries, and importantly, has led to the renaissance in fabrication known as the . The technological premises of all direct-write additive manufacturing are identical—converting computer generated three-dimensional models into layers of two-dimensional planes or slices, which are then reconstructed sequentially into three-dimensional solid objects in a layer-by-layer format. The key differences between the various additive manufacturing techniques are the means of creating the finished layers and the ancillary processes that accompany them. While still at its infancy, direct-write additive manufacturing techniques at the microscale have the potential to significantly lower the barrier-of-entry—in terms of cost, time and training—for the prototyping and fabrication of MEMS parts that have larger dimensions, high aspect ratios, and complex shapes. In recent years, significant advancements in materials chemistry, laser technology, heat and fluid modeling, and control systems have enabled additive manufacturing to achieve higher resolutions at the micrometer and nanometer length scales to be a viable technology for MEMS fabrication. Compared to traditional MEMS processes that rely heavily on expensive equipment and time-consuming steps, direct-write additive manufacturing techniques allow for rapid design-to-prototype realization by limiting or circumventing the need for cleanrooms, photolithography and extensive training. With current direct-write additive manufacturing technologies, it is possible to fabricate unsophisticated micrometer scale structures at adequate resolutions and precisions using materials that range from polymers, metals, ceramics, to composites. In both academia and industry, direct-write additive manufacturing offers extraordinary promises to revolutionize research and development in microfabrication and MEMS technologies. Importantly, direct-write additive manufacturing could appreciably augment current MEMS fabrication technologies, enable faster design-to-product cycle, empower new paradigms in MEMS designs, and critically, encourage wider participation in MEMS research at institutions or for individuals with limited or no access to cleanroom facilities. This article aims to provide a limited review of the current landscape of direct-write additive manufacturing techniques that are potentially applicable for MEMS microfabrication.
关键词: direct-write additive manufacturing microfabrication MEMS
Regulation of radicals by hydrogen-donor solvent in direct coal liquefaction
《化学科学与工程前沿(英文)》 2022年 第16卷 第12期 页码 1689-1699 doi: 10.1007/s11705-022-2186-7
关键词: direct coal liquefaction hydrogen-donor solvent induced pyrolysis radical mechanism density functional theory calculations
Direct acting antiviral-induced dynamic reduction of serum
Tung Huynh, Ke-Qin Hu
《医学前沿(英文)》 2019年 第13卷 第6期 页码 658-666 doi: 10.1007/s11684-019-0707-7
关键词: chronic hepatitis C α fetoprotein direct acting antiviral treatment cirrhosis
Design and analysis of a new high frequency double-servo direct drive rotary valve
Muzhi ZHU,Shengdun ZHAO,Jingxiang LI
《机械工程前沿(英文)》 2016年 第11卷 第4期 页码 344-350 doi: 10.1007/s11465-016-0406-x
Researchers have investigated direct drive valve for many years to solve problems, such as fluid force imbalance and switching frequency. The structure of the rotary valve has received considerable research interest because of its favorable dynamic properties and simple structure. This paper studied the high frequency double-servo direct drive rotary valve (DDRV), and proposed a novel structure and drive method satisfying high reversing frequency and adequate quantity of flow. Servo motors are integrated into the valve by the innovative structure, which is designed to equilibrate the unbalanced radial fluid force with the symmetric distributed oil ports. Aside from the fast reversing function of the valve, the DDRV presented high performance in linearity of the flow quantity and valve opening as a result of the fan-shaped flow ports. In addition, a computational fluid dynamics (CFD) method based on Fluent was conducted to verify the flux regulation effect of the height change of the adjustable boss.
关键词: direct drive rotary valve computational fluid dynamics (CFD) flow regulation
Direct energy rebound effect for road transportation in China
《工程管理前沿(英文)》 页码 597-611 doi: 10.1007/s42524-023-0276-y
关键词: road transportation direct energy rebound effect asymmetric price effects panel data model
Effect of light scattering on the performance of a direct absorption solar collector
Kwang Hyun WON, Bong Jae LEE
《能源前沿(英文)》 2018年 第12卷 第1期 页码 169-177 doi: 10.1007/s11708-018-0527-5
关键词: direct absorption solar collector plasmonic nanofluid light scattering
Moulay Rachid DOUIRI, Mohamed CHERKAOUI
《能源前沿(英文)》 2013年 第7卷 第4期 页码 456-467 doi: 10.1007/s11708-013-0264-8
关键词: adaptive neuro-fuzzy inference system (ANFIS) artificial neural network direct torque control (DTC) fuzzy logic induction motor
Biosorption of Direct Black 38 by dried anaerobic granular sludge
WANG Xuejiang, XIA Siqing, ZHAO Jianfu
《环境科学与工程前沿(英文)》 2008年 第2卷 第2期 页码 198-202 doi: 10.1007/s11783-008-0031-y
How aerosol direct effects influence the source contributions to PM
Litao Wang, Joshua S. Fu, Wei Wei, Zhe Wei, Chenchen Meng, Simeng Ma, Jiandong Wang
《环境科学与工程前沿(英文)》 2018年 第12卷 第3期 doi: 10.1007/s11783-018-1014-2
关键词: Aerosol direct effect PM2.5 Southern Hebei WRF/Chem Haze
Ultraviolet exposure enhanced silicon direct bonding
Guanglan LIAO, Xuekun ZHANG, Xiaohui LIN, Canghai MA, Lei NIE, Tielin SHI,
《机械工程前沿(英文)》 2010年 第5卷 第1期 页码 87-92 doi: 10.1007/s11465-009-0078-x
关键词: ultraviolet (UV) exposure silicon direct bonding bonding strength reliability
Heng NIAN,Yi-peng SONG
《信息与电子工程前沿(英文)》 2015年 第16卷 第4期 页码 321-334 doi: 10.1631/FITEE.1400170
关键词: Direct power control Doubly fed induction generator Unbalanced and distorted grid voltage Vector proportional and integral resonant regulator Parameter deviation
An overview and recent advances in electrocatalysts for direct seawater splitting
《化学科学与工程前沿(英文)》 2021年 第15卷 第6期 页码 1408-1426 doi: 10.1007/s11705-021-2102-6
关键词: seawater splitting electrocatalysts oxygen evolution reaction hydrogen evolution reaction chlorine chemistry
Abdelkarim AMMAR,Amor BOUREK,Abdelhamid BENAKCHA
《能源前沿(英文)》 2020年 第14卷 第4期 页码 836-849 doi: 10.1007/s11708-017-0444-z
关键词: induction motor direct torque control (DTC) space vector modulation (SVM) sliding mode control (SMC) sliding mode observer (SMO) dS1104
Review of the direct thermochemical conversion of lignocellulosic biomass for liquid fuels
Jianchun JIANG,Junming XU,Zhanqian SONG
《农业科学与工程前沿(英文)》 2015年 第2卷 第1期 页码 13-27 doi: 10.15302/J-FASE-2015050
关键词: lignocellulosic biomass thermochemical liquid fuels upgrading biofuels
标题 作者 时间 类型 操作
Design and analysis of a new high frequency double-servo direct drive rotary valve
Muzhi ZHU,Shengdun ZHAO,Jingxiang LI
期刊论文
Effect of light scattering on the performance of a direct absorption solar collector
Kwang Hyun WON, Bong Jae LEE
期刊论文
Comparative study of various artificial intelligence approaches applied to direct torque control of induction
Moulay Rachid DOUIRI, Mohamed CHERKAOUI
期刊论文
Biosorption of Direct Black 38 by dried anaerobic granular sludge
WANG Xuejiang, XIA Siqing, ZHAO Jianfu
期刊论文
How aerosol direct effects influence the source contributions to PM
Litao Wang, Joshua S. Fu, Wei Wei, Zhe Wei, Chenchen Meng, Simeng Ma, Jiandong Wang
期刊论文
Ultraviolet exposure enhanced silicon direct bonding
Guanglan LIAO, Xuekun ZHANG, Xiaohui LIN, Canghai MA, Lei NIE, Tielin SHI,
期刊论文
Multiple target implementation for a doubly fed induction generator based on direct power control under
Heng NIAN,Yi-peng SONG
期刊论文
Robust SVM-direct torque control of induction motor based on sliding mode controller and sliding mode
Abdelkarim AMMAR,Amor BOUREK,Abdelhamid BENAKCHA
期刊论文