Journal of Micromechanics and Microengineering最新文献_第3页

Lithographically patternable SU-8/Graphene nanocomposite based strain sensors for soft-MEMS applications 基于可光刻图案化 SU-8/石墨烯纳米复合材料的应变传感器，用于软-MEMS 应用

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-08-07 DOI: 10.1088/1361-6439/ad690e

Faizan Tariq Beigh, Nadeem Tariq Beigh and Dhiman Mallick

引用次数: 0

Efficient strategy for frequency design and bandwidth extension of curved piezoelectric ultrasonic micromachined transducers 曲面压电超声波微机械换能器频率设计和带宽扩展的高效策略

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-08-07 DOI: 10.1088/1361-6439/ad690d

Hao Li, Xiaofan Hu, Xingli Xu, Yongquan Ma, Chenyang Yu, Wei Wei and Pengfei Niu

{"title":"Efficient strategy for frequency design and bandwidth extension of curved piezoelectric ultrasonic micromachined transducers","authors":"Hao Li, Xiaofan Hu, Xingli Xu, Yongquan Ma, Chenyang Yu, Wei Wei and Pengfei Niu","doi":"10.1088/1361-6439/ad690d","DOIUrl":"https://doi.org/10.1088/1361-6439/ad690d","url":null,"abstract":"This article proposes an efficient analytical model and strategy for designing curved piezoelectric micromachined ultrasonic transducers (curved PMUTs). The model is developed based on the Donnell–Mushtari–Vlasov theory and the equivalent single layer method, and validated through finite element analysis. Utilizing the model, we further analyze the diaphragm’s vibration modes and key design parameters. The proposed strategy is centered on 2 design equations, facilitating the rapid design of devices at any frequency through parametric sweeps. Furthermore, to minimize bandwidth loss, we employ the merging of adjacent vibration modes to broaden the bandwidth. Using the proposed method for modes merging, we have effortlessly designed devices with operating frequencies of 2.15 MHz, 6.3 MHz, 10.65 MHz, and 18.75 MHz in water. For comparison, we also designed planar PMUTs and general curved PMUTs operating around 6 MHz and 15 MHz. Compared to planar PMUTs, curved PMUTs show exceptional performance improvements in output pressure and sensitivity. Moreover, the proposed strategy for bandwidth extension results in 1.33× and 1.25× bandwidth improvements around 6 MHz and 15 MHz. The proposed design methodology is anticipated to assist engineers in designing high-performance PMUT arrays more efficiently and systematically.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"13 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The UmboMic: a PVDF cantilever microphone * UmboMic: PVDF 悬臂麦克风 *

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-07-17 DOI: 10.1088/1361-6439/ad5c6d

Aaron J Yeiser, Emma F Wawrzynek, John Z Zhang, Lukas Graf, Christopher I McHugh, Ioannis Kymissis, Elizabeth S Olson, Jeffrey H Lang and Hideko Heidi Nakajima

{"title":"The UmboMic: a PVDF cantilever microphone *","authors":"Aaron J Yeiser, Emma F Wawrzynek, John Z Zhang, Lukas Graf, Christopher I McHugh, Ioannis Kymissis, Elizabeth S Olson, Jeffrey H Lang and Hideko Heidi Nakajima","doi":"10.1088/1361-6439/ad5c6d","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5c6d","url":null,"abstract":"Objective. We present the ‘UmboMic,’ a prototype piezoelectric cantilever microphone designed for future use with totally-implantable cochlear implants. Methods. The UmboMic sensor is made from polyvinylidene difluoride (PVDF) because of its low Young’s modulus and biocompatibility. The sensor is designed to fit in the middle ear and measure the motion of the underside of the eardrum at the umbo. To maximize its performance, we developed a low noise charge amplifier in tandem with the UmboMic sensor. This paper presents the performance of the UmboMic sensor and amplifier in fresh cadaveric human temporal bones. Results. When tested in human temporal bones, the UmboMic apparatus achieves an equivalent input noise of 32.3 dB SPL over the frequency range 100 Hz–7 kHz, good linearity, and a flat frequency response to within 10 dB from about 100 Hz–6 kHz. Conclusion. These results demonstrate the feasibility of a PVDF-based microphone when paired with a low-noise amplifier. The reported UmboMic apparatus is comparable in performance to a conventional hearing aid microphone. Significance. The proof-of-concept UmboMic apparatus is a promising step towards creating a totally-implantable cochlear implant. A completely internal system would enhance the quality of life of cochlear implant users.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"47 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-layered microwell-array device for preparation of single-neuron culture samples 用于制备单神经元培养样本的双层微阵列装置

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-07-17 DOI: 10.1088/1361-6439/ad5b00

Ayaka Nakama and Takashi Yasuda

{"title":"Two-layered microwell-array device for preparation of single-neuron culture samples","authors":"Ayaka Nakama and Takashi Yasuda","doi":"10.1088/1361-6439/ad5b00","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5b00","url":null,"abstract":"When a single neuron is cultured in isolation from other neurons, its axon connects with its own dendrites to form a simple, independent network with no synaptic inputs from other neurons. This culture system enables detailed analysis of synaptic function and morphology change in neurites at the single-neuron level, which is useful for elucidating the pathogenesis of neurological diseases and for evaluating the efficacy of therapeutic drugs for them. However, there was previously no device technology capable of simultaneously forming multiple single-neuron samples while allowing co-culture with astrocytes, which is essential for culture of a single neuron isolated from other neurons. In this study, we propose a novel microwell-array device for preparing single-neuron samples. The device consists of an upper layer for cell seeding and a lower layer for cell culture. Each layer has 16 × 16 microwells, and the bottom of each well is made of a 1 μm thick silicon nitride membrane. The membrane of the upper well has one microhole for seeding a single neuron, and the lower membrane has multiple microholes for interaction between a single neuron and astrocytes which are co-cultured back-to-back on both sides of the membrane. When neurons are seeded into the upper well, only one of them passes through the microhole in the upper membrane and falls onto the lower membrane. We evaluated a seeding efficiency of single neurons by changing seeding hole diameter and seeding density. The results showed that the yield of more than 20% was obtained regardless of the seeding density when the seeding hole diameter was 13 μm. We also confirmed that single neurons seeded in this manner and co-cultured with astrocytes developed neurites and formed synapses. These results demonstrated the usefulness of this device for the preparation of single-neuron culture samples.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"6 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabrication of microneedles using wire electric discharge machining and improving surface quality by electrochemical polishing 利用线状放电加工制造微针并通过电化学抛光提高表面质量

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-07-11 DOI: 10.1088/1361-6439/ad5dc7

Partha Sarkar and Ajay M Sidpara

{"title":"Fabrication of microneedles using wire electric discharge machining and improving surface quality by electrochemical polishing","authors":"Partha Sarkar and Ajay M Sidpara","doi":"10.1088/1361-6439/ad5dc7","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5dc7","url":null,"abstract":"Microneedle (MN) arrays have many applications in biomedical engineering to deliver drugs transdermally or extract biomarkers from the interstitial fluid from the human skin. Several methods have been developed to fabricate different sizes and shapes of MN using polymers, ceramics and metals. However, most of these methods require expensive sophisticated machines and clean room facilities. So, it is difficult to fabricate microneedle arrays in large quantities at a reasonable cost. This study reports the fabrication of a high-quality stainless steel master pattern for an MN array using a wire-cut electric discharge machining process followed by electrochemical polishing (ECP). Different densities of a 5 × 5 array of microneedles with pyramidal shapes were fabricated by machining channels onto the workpiece surface in a criss-cross pattern. A systematic experimental study was carried out with reference to the offset between the two consecutive channel faces and the depth of channels. The output parameters are MN height (MNH), MN base (MNBW) and tip width (MNTW). The average needle tip width, base width, and height of microneedles were found to be 55.3 ± 5 µm, 679.8 ± 10 µm, and 914.7 ± 19 µm. Finally, the sharpness of the MN tips and the overall surface finish of the MN array were improved with ECP. The reductions in MNH, MNBW, and MNTW were reported to be −18.3%, −9.7%, and −95.4%, respectively, with a final tip width of 2.55 ± 1.62 µm. The MNs’ tip angle was reported to be 32.52° ± 1.56.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"78 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141608477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Large stroke electromagnetic redundant actuated six degrees-of-freedom parallel compliant micropositioning stage 大行程电磁冗余致动六自由度平行顺应式微定位平台

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-07-10 DOI: 10.1088/1361-6439/ad5dc6

Chao Xie, Leijie Lai, Yunzhuang Chen and Limin Zhu

{"title":"Large stroke electromagnetic redundant actuated six degrees-of-freedom parallel compliant micropositioning stage","authors":"Chao Xie, Leijie Lai, Yunzhuang Chen and Limin Zhu","doi":"10.1088/1361-6439/ad5dc6","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5dc6","url":null,"abstract":"In this paper, a novel large stroke six degrees-of-freedom (6-DOF) electromagnetic redundant actuated micropositioning stage is proposed. The 6-DOF stage adopts a configuration that is composed of eight parallel driving branch chains. Each branch chain is driven by a voice coil motor and incorporates a parallelogram flexure mechanism and a decoupling mechanism for guidance and decoupling. The positioning stage is symmetrically arranged and possesses the advantages of simple structure and easy assembly. As a result, assembly errors are significantly reduced and positioning accuracy is enhanced. The decoupling mechanism uses a large stroke flexible ball joint that increases the motion range of the positioning stage and decouples the coupled motion, thereby enhancing the stability and accuracy of the stage. To evaluate the performance of the stage, static and dynamic analytical models of the 6-DOF stage are derived based on the compliance matrix method and the Lagrangian dynamic modeling method. Additionally, the accuracy of the analytical models and the static and dynamic performances of the positioning stage are verified through finite element analysis (FEA) and experimental testing. The experimental results demonstrate that the stage realizes a workspace of 2.06 mm × 2.02 mm × 3.1 mm × 23.4 mrad × 23.1 mrad × 14.9 mrad. Finally, to verify the tracking performance trajectory of the 6-DOF positioning stage, tracking experiments are performed using a controller that combines a proportional-integral controller and a notch filter.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"31 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141587760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent progress in 2D textile-based piezoresistive strain and pressure sensors 基于二维纺织品的压阻应变和压力传感器的最新进展

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-07-09 DOI: 10.1088/1361-6439/ad5cfd

Srinivasan Raman and Ravi Sankar A

{"title":"Recent progress in 2D textile-based piezoresistive strain and pressure sensors","authors":"Srinivasan Raman and Ravi Sankar A","doi":"10.1088/1361-6439/ad5cfd","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5cfd","url":null,"abstract":"The integration of electronic functionalities into textiles has been under extensive research as its application is witnessed in various fields, including sensing, energy generation, storage, displays, and interfaces. Textiles endowed with flexibility, comfort, lightweight, and washability have been tested as reliable base materials to implement various physical sensors, of which strain and pressure sensors have shown great potential in applications such as healthcare, fitness tracking, and human-machine interaction. Piezoresistive physical sensors have considerable advantages over capacitive and piezoelectric sensors made of textiles. Apart from fibers, yarns, and threads, two-dimensional textile stripes occupy a significant share as substrates in these sensors. This review article discusses the recent progress of 2D textile-based piezoresistive strain and pressure sensors. It covers the latest works in this domain, focusing on different textile choices, conductive material combinations, fabrication methods, additional functionalities like heating, features like hydrophobic properties, and various applications, with tabulations of key performance metrics. For researchers seeking an update on the state of the field, this review would be helpful as it offers insights into trends for further research and product development aimed at meeting the demands of advanced healthcare and other applications.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"40 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Manufacturing fused silica hemispherical resonators using polymer glass suspension and replication molding 利用聚合物玻璃悬浮液和复制成型技术制造熔融石英半球形谐振器

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-07-09 DOI: 10.1088/1361-6439/ad5b6a

Yahya Atwa, Hamza Shakeel

{"title":"Manufacturing fused silica hemispherical resonators using polymer glass suspension and replication molding","authors":"Yahya Atwa, Hamza Shakeel","doi":"10.1088/1361-6439/ad5b6a","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5b6a","url":null,"abstract":"This work introduces a new method for manufacturing fused silica (FS)-based hemispherical resonators (HSRs) using a printable polymer glass mixture and replication molding. This process involves 3D printing to create the mold, followed by the casting of a photo-reactive pre-polymer glass mixture. This technique allows us to produce complex 3D geometries and offers faster production of resonators compared to other traditional methods. In this study, we manufactured three devices and successfully identified resonance modes with two (<italic toggle=\"yes\">N</italic> = 2), three (<italic toggle=\"yes\">N</italic> = 3) and four (<italic toggle=\"yes\">N</italic> = 4) nodes/antinodes in all three HSRs, demonstrating the repeatability of our new manufacturing method. The highest quality factor of 482 k was achieved for the <italic toggle=\"yes\">N</italic> = 3 resonance mode using the ring-down method. Some of the key advantages of our method include producing multiple devices efficiently with relatively good surface quality, making it a viable option for producing high-precision devices in the future. Our new fabrication technique results in a device surface roughness of ∼100 nm (measured over an area of 250 <italic toggle=\"yes\">μ</italic>m × 250 <italic toggle=\"yes\">μ</italic>m) and manufacturing yield of over 90%. Moreover, all the steps involved in this method can be completed outside of a specialized cleanroom environment.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"49 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design optimization and experimental verification of ultrasonic stack for micro hot embossing of polymers 用于聚合物微热压花的超声波叠层的设计优化和实验验证

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-07-04 DOI: 10.1088/1361-6439/ad5c6e

Ahmed Abdel-Aleem, Ahmed M R Fath El-Bab, Masahiko Yoshino, Hassan A El-Hofy and Mohsen A Hassan

{"title":"Design optimization and experimental verification of ultrasonic stack for micro hot embossing of polymers","authors":"Ahmed Abdel-Aleem, Ahmed M R Fath El-Bab, Masahiko Yoshino, Hassan A El-Hofy and Mohsen A Hassan","doi":"10.1088/1361-6439/ad5c6e","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5c6e","url":null,"abstract":"Ultrasonic micro hot embossing (UMHE) is a prominent technique used in numerous sectors to produce micro parts since it is cheaper, faster, and more accurate. Amplitude uniformity is a crucial parameter in UMHE in order to manufacture micro parts with accurate dimensions and high-quality surfaces, even though limited research has been conducted on the uniformity of ultrasonic amplitude at the horn face during the embossing process. This paper presents an experimental and numerical study for designing an ultrasonic transducer and horn tailored to the micro hot embossing of polymer micro parts. A finite element (FE) simulation model combined with the Taguchi method has been developed to optimize the horn geometry and maximum amplitude uniformity. The Taguchi orthogonal array of 25 design runs has been generated and simulated using the developed FE modal analysis model, and then the optimized geometry was used to fabricate the horn. Applied torque and operating time calibrate and evaluate the transducer vibration characteristics. Experimental and simulation results revealed that the fabricated ultrasonic transducer and horn of a straight microfeature has a natural frequency of 28.8 kHz and has an 11 µm average peak-to-peak amplitude with 0.963 amplitude homogeneity along the microfeature face. The achieved frequency separation was greater than 0.85 kHz, whereas the gain ratio was 1.2. The design methodology developed in this paper showed great potential and has been numerically validated for various microfeature shapes across the horn face. Consequently, it can be applied to various ultrasonic applications beyond UMHE.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"24 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microfluidic carbon cloth-based enzymatic glucose biofuel cell for sustainably powering a microelectronic circuit * 用于为微电子电路提供可持续动力的微流体碳布基酶法葡萄糖生物燃料电池 *

IF 2.3 4区工程技术

Journal of Micromechanics and Microengineering Pub Date : 2024-07-04 DOI: 10.1088/1361-6439/ad5b6b

S Vanmathi and Sanket Goel

{"title":"Microfluidic carbon cloth-based enzymatic glucose biofuel cell for sustainably powering a microelectronic circuit *","authors":"S Vanmathi and Sanket Goel","doi":"10.1088/1361-6439/ad5b6b","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5b6b","url":null,"abstract":"Enhancing enzymatic microfluidic biofuel cells (EBFCs) devices has garnered significant attention due to the development of microfluidic ultra-low power energy-gathering techniques. To facilitate the ability to create microfluidic EBFCs, a carbon cloth (CC) has been considered since they are effective renewable energy sources and utilized as the ideal paper-based substitute for traditional power supplies for a variety of tiny devices due to their inherent qualities and exceptional performance. The developed microfluidic EBFC utilized glucose as a fuel, carbon cloth as the bioelectrode, Glucose oxidase for the anode, and laccase for the cathode. The maximum stable open circuit voltage of CC-EBFC was measured to be 475 mV with a peak power density of 85 µW cm−2 at 300 mV and a current density of 484 µA cm−2. The power performance of the device was improved by bovine serum albumin and a booster circuit, which was also coated and connected to the load to stabilize the performance. The novelty of the work is that using a flexible substrate of carbon cloth, with a microfluidic channel, has an added advantage in the biofuel cell. LTC3108EDE DC–DC booster was used to increase energy and attain a high charging voltage of 5 V to operate a digital watch up to 3 V. With minimal weight and flexibility; this minuscule device opens up new possibilities to sustainably power wearable and portable microelectronic devices.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"107 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0