Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808377
S. Mengali, I. Elmi, L. Masini, F. Bonafè, F. Tamarri, M. Sanmartin, R. Viola, N. Liberatore, S. Zampolli
This paper reports on a portable selective sensor for trace levels of hazardous vapors, which combines a twostage purge and trap vapor pre-concentration system, a MEMS gas-chromatographic (GC) separation column and a miniaturized quartz-enhanced photoacoustic spectroscopy (QEPAS) detector. This is the first demonstration of a miniaturized QEPAS device used as spectroscopic detector downstream of a FAST-GC separation column, demonstrating two-dimensional selectivity and enabling real-world analyses in dirty environments with response time of a few minutes. Furthermore, the integrated sensing system was specifically designed to be rugged and suitable to be deployed on unmanned robotic ground vehicles.
{"title":"GC-QEPAS: A Mems-Enabled Portable Trace Chemical Sensor for Safety & Security Applications","authors":"S. Mengali, I. Elmi, L. Masini, F. Bonafè, F. Tamarri, M. Sanmartin, R. Viola, N. Liberatore, S. Zampolli","doi":"10.1109/TRANSDUCERS.2019.8808377","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808377","url":null,"abstract":"This paper reports on a portable selective sensor for trace levels of hazardous vapors, which combines a twostage purge and trap vapor pre-concentration system, a MEMS gas-chromatographic (GC) separation column and a miniaturized quartz-enhanced photoacoustic spectroscopy (QEPAS) detector. This is the first demonstration of a miniaturized QEPAS device used as spectroscopic detector downstream of a FAST-GC separation column, demonstrating two-dimensional selectivity and enabling real-world analyses in dirty environments with response time of a few minutes. Furthermore, the integrated sensing system was specifically designed to be rugged and suitable to be deployed on unmanned robotic ground vehicles.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"88 1","pages":"1365-1368"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86485112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808497
Silvia Demuru, R. Haque, M. Joho, A. Bionaz, P. D. van der Wal, D. Briand
This paper presents a novel process for screen printed electrode fabrication, functionalization and integration in a polyethylene terephthalate (PET) fluidics system for electrochemical analysis. The innovative components utilized are: 1. 3D Through-Foil Vias (TFVs) for electrode connection, enabling simple liquid tight lamination of micro-fluidic channels; 2. Screen printed carbon and silver/silver chloride (Ag/AgCl) electrodes on 3D vias; and 3. PET fluidics with a fabrication process compatible with large-area manufacturing. A platform integrating an Ag/AgCl pseudo-reference and a glucose oxidase (GOx)-modified working electrode has been used for glucose sensing in the flexible fluidics system. Detection of small glucose concentrations between 100-400 μM through Cyclic Voltammetry (CV) is shown. The sensor shows linear response and good sensitivity of ~0.8 mA/(mM cm2). By changing the electrode coatings, the same technology can potentially be used for detecting multiple analytes in biofluids.
{"title":"3D-Integration of Printed Electrochemical Sensors in Pet Microfluidics for Biochemical Sensing","authors":"Silvia Demuru, R. Haque, M. Joho, A. Bionaz, P. D. van der Wal, D. Briand","doi":"10.1109/TRANSDUCERS.2019.8808497","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808497","url":null,"abstract":"This paper presents a novel process for screen printed electrode fabrication, functionalization and integration in a polyethylene terephthalate (PET) fluidics system for electrochemical analysis. The innovative components utilized are: 1. 3D Through-Foil Vias (TFVs) for electrode connection, enabling simple liquid tight lamination of micro-fluidic channels; 2. Screen printed carbon and silver/silver chloride (Ag/AgCl) electrodes on 3D vias; and 3. PET fluidics with a fabrication process compatible with large-area manufacturing. A platform integrating an Ag/AgCl pseudo-reference and a glucose oxidase (GOx)-modified working electrode has been used for glucose sensing in the flexible fluidics system. Detection of small glucose concentrations between 100-400 μM through Cyclic Voltammetry (CV) is shown. The sensor shows linear response and good sensitivity of ~0.8 mA/(mM cm2). By changing the electrode coatings, the same technology can potentially be used for detecting multiple analytes in biofluids.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"76 1","pages":"2464-2467"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86576300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808273
M. Hügle, Lara S. Siegel, O. Behrmann, F. Hufert, G. Dame, G. Urban
We present a lab-on-a-chip for the extraction of bacterial nucleic acids from whole human blood (WHB). Compared to classical methods, with extraction times between hours and days, the presented chip can lyse the bacteria suspended in WHB and extract their nucleic acids within three minutes. This is achieved by directly coupling thermal lysis to gel-electrophoresis on a single microfluidic platform.
{"title":"A Lab-on-a-Chip For The Extraction Of Bacterial Nucleic Acids From Whole Human Blood","authors":"M. Hügle, Lara S. Siegel, O. Behrmann, F. Hufert, G. Dame, G. Urban","doi":"10.1109/TRANSDUCERS.2019.8808273","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808273","url":null,"abstract":"We present a lab-on-a-chip for the extraction of bacterial nucleic acids from whole human blood (WHB). Compared to classical methods, with extraction times between hours and days, the presented chip can lyse the bacteria suspended in WHB and extract their nucleic acids within three minutes. This is achieved by directly coupling thermal lysis to gel-electrophoresis on a single microfluidic platform.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"81 1","pages":"925-927"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86217367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808508
Hongjie Jiang, Albert Kim, Jiawei Zhou, R. Rahimi, B. Ziaie
Accurate sensing and drug delivery at designated locations within the GI-tract is needed to increase the performance and efficacy of smart capsules. In this work, we utilize the near infrared (NIR) penetration of light within the tissue for real-time tracking of a 3D-printed capsule. The capsule incorporates an array of three 875 nm NIR-LEDs powered by an on-board battery. Ex vivo experiments using porcine tissue and a paired photodiode receiver showed a light penetration depth of 6.2 cm. Three on-board batteries (1.5 V, 10 mAh) can provide enough power to continuously track the capsule in the small intestine for 2 hours, thus providing a good coverage of capsule positioning in the jejunum.
{"title":"Real-Time Tracking of a 3D-Printed Smart Capsule Using on-Board Near-Infrared Led Array","authors":"Hongjie Jiang, Albert Kim, Jiawei Zhou, R. Rahimi, B. Ziaie","doi":"10.1109/TRANSDUCERS.2019.8808508","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808508","url":null,"abstract":"Accurate sensing and drug delivery at designated locations within the GI-tract is needed to increase the performance and efficacy of smart capsules. In this work, we utilize the near infrared (NIR) penetration of light within the tissue for real-time tracking of a 3D-printed capsule. The capsule incorporates an array of three 875 nm NIR-LEDs powered by an on-board battery. Ex vivo experiments using porcine tissue and a paired photodiode receiver showed a light penetration depth of 6.2 cm. Three on-board batteries (1.5 V, 10 mAh) can provide enough power to continuously track the capsule in the small intestine for 2 hours, thus providing a good coverage of capsule positioning in the jejunum.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"54 1","pages":"2201-2204"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89599046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808280
Xinran Wang, Yang Tian, Yuncong Chen, Yueyi Jiao, Md. Azahar Ali, Le Wei, Liang Dong
This paper reports a low-cost extended-gate field effect transistor based nitrate sensor using a microfluidic channel based Reference Electrode (µcRE). The µcRE is integrated with a MOSFET to increase potential stability for long-term measurement. The sensor also includes a readout circuit to save or remotely transmit data to a smartphone. The µcRE exhibits a 0.5 mV/hour drift rate and the sensor offers a 0.997 R-Squared value to the linear fitting for potentiometric measurement of nitrate in water.
{"title":"Low-Cost Extended-Gate Field Effect Transistor Sensing System Based on A Channel Structured Reference Electrode","authors":"Xinran Wang, Yang Tian, Yuncong Chen, Yueyi Jiao, Md. Azahar Ali, Le Wei, Liang Dong","doi":"10.1109/TRANSDUCERS.2019.8808280","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808280","url":null,"abstract":"This paper reports a low-cost extended-gate field effect transistor based nitrate sensor using a microfluidic channel based Reference Electrode (µcRE). The µcRE is integrated with a MOSFET to increase potential stability for long-term measurement. The sensor also includes a readout circuit to save or remotely transmit data to a smartphone. The µcRE exhibits a 0.5 mV/hour drift rate and the sensor offers a 0.997 R-Squared value to the linear fitting for potentiometric measurement of nitrate in water.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"2 1","pages":"1381-1384"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72750406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808519
Florian Dupla, Marie-Sophie Renoirt, M. Gonon, N. Smagin, M. Duquennoy, G. Martic, M. Rguiti
This paper presents a surface acoustic wave (SAW) device able to operate up to 900°C, based on a piezoelectric non-ferroelectric glass-ceramic containing fresnoite crystals. This material is synthesized by a classic glassmaking technique and isothermal crystallization heat treatment. Its properties are measured at high temperatures. Input and output interdigital transducers (IDT) are realized on its surface to generate and receive the SAW. It creates a temperature device working up to 800°C, that will further be modified in pressure or humidity sensors by applying the appropriate sensitive layer between the input and the output IDT.
{"title":"Surface Acoustic Wave Generation and Propagation on Polar Glass-Ceramic for High Temperature Sensors","authors":"Florian Dupla, Marie-Sophie Renoirt, M. Gonon, N. Smagin, M. Duquennoy, G. Martic, M. Rguiti","doi":"10.1109/TRANSDUCERS.2019.8808519","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808519","url":null,"abstract":"This paper presents a surface acoustic wave (SAW) device able to operate up to 900°C, based on a piezoelectric non-ferroelectric glass-ceramic containing fresnoite crystals. This material is synthesized by a classic glassmaking technique and isothermal crystallization heat treatment. Its properties are measured at high temperatures. Input and output interdigital transducers (IDT) are realized on its surface to generate and receive the SAW. It creates a temperature device working up to 800°C, that will further be modified in pressure or humidity sensors by applying the appropriate sensitive layer between the input and the output IDT.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"275 1","pages":"1921-1924"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73381266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808210
N. K. Heinsohn, Robert R. Niedl, C. Beta
In this work directed DNA motion within a biopolymer network could be successfully implemented and monitored, using a fiber based electrophoresis chip with imprinted electrodes. Conveniently the same electrodes are used for applying the electric field and for current measurement to control the DNA motion simultaneously. This will allow the extension of present DNA detection and verification methods in disposable on-site analytical test systems.
{"title":"Printed Electrophoresis-Driven DNA Separator","authors":"N. K. Heinsohn, Robert R. Niedl, C. Beta","doi":"10.1109/TRANSDUCERS.2019.8808210","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808210","url":null,"abstract":"In this work directed DNA motion within a biopolymer network could be successfully implemented and monitored, using a fiber based electrophoresis chip with imprinted electrodes. Conveniently the same electrodes are used for applying the electric field and for current measurement to control the DNA motion simultaneously. This will allow the extension of present DNA detection and verification methods in disposable on-site analytical test systems.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"3 1","pages":"1112-1115"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75313082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808734
F. Almazán, L. Val, M. Urbiztondo, M. Pina, J. Santamaría
Herein, we present microfluidic devices for sampling of chemical warfare agents (CWAs) diluted in gaseous streams. The scope of this work is to design and fabricate efficient, low-cost sample collectors for on-field application against terrorist and other malicious violent attacks. The main feature of our μ-sampling unit lies on the in-situ deposition and UV polymerization of a protic ionic liquid monomeric salt (MIL) inside an already sealed Si microdevice. Dynamic retention capacities have been assessed with vapors of a nerve agent surrogate, i.e. dimethyl methylphosphonate (DMMP). The coated μ–preconcentrators exhibit outstanding breakthrough volumes and higher sorption capacities than those reported for commercial sorbents.
{"title":"µ-Preconcentrators Using Protic Imidazolium Polyionic Liquids for Chemical Warfare Agents Sampling at Trace Level","authors":"F. Almazán, L. Val, M. Urbiztondo, M. Pina, J. Santamaría","doi":"10.1109/TRANSDUCERS.2019.8808734","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808734","url":null,"abstract":"Herein, we present microfluidic devices for sampling of chemical warfare agents (CWAs) diluted in gaseous streams. The scope of this work is to design and fabricate efficient, low-cost sample collectors for on-field application against terrorist and other malicious violent attacks. The main feature of our μ-sampling unit lies on the in-situ deposition and UV polymerization of a protic ionic liquid monomeric salt (MIL) inside an already sealed Si microdevice. Dynamic retention capacities have been assessed with vapors of a nerve agent surrogate, i.e. dimethyl methylphosphonate (DMMP). The coated μ–preconcentrators exhibit outstanding breakthrough volumes and higher sorption capacities than those reported for commercial sorbents.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"72 1","pages":"1415-1418"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76212608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808645
C. Pannek, C. Weber, T. Vetter, R. Pohle, L. Engel, A. Eberhardt, K. Tarantik, M. Bauersfeld, J. Wöllenstein
A novel colorimetric sensor system for the detection of carbon monoxide (CO) in low ppm concentrations for early fire gas detection is described. Due to its low power consumption and low fabrication costs the sensor enables the integration into a commercial fire detector.Screen printing methods for depositing thin films allow a fast gas interaction and a high degree of integration of the sensor system. The response of the sensor system to carbon monoxide was characterized both in the laboratory and in real firing tests.
{"title":"Colorimetric Sensor System for the Detection of Low Co-Concentrations in Real Fire Tests","authors":"C. Pannek, C. Weber, T. Vetter, R. Pohle, L. Engel, A. Eberhardt, K. Tarantik, M. Bauersfeld, J. Wöllenstein","doi":"10.1109/TRANSDUCERS.2019.8808645","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808645","url":null,"abstract":"A novel colorimetric sensor system for the detection of carbon monoxide (CO) in low ppm concentrations for early fire gas detection is described. Due to its low power consumption and low fabrication costs the sensor enables the integration into a commercial fire detector.Screen printing methods for depositing thin films allow a fast gas interaction and a high degree of integration of the sensor system. The response of the sensor system to carbon monoxide was characterized both in the laboratory and in real firing tests.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"22 1","pages":"1345-1348"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91176716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-23DOI: 10.1109/TRANSDUCERS.2019.8808694
M. Valette, Mathias Bouguelmouna, M. Mariotte, R. Courson, Marie-Charline Blatché, A. Girousse, C. Sengenès, K. Reybier, A. Gué
This study presents the development of an original 2-steps Lab-on-chip that aims at isolating Adipose Stem Cells (ASCs), cells of considerable interest for regenerative medicine, from complex biological samples. Based on hydrodynamic filtration, the device pre-isolates ASCs by removing cells with a diameter below 10µm such as red blood cells or lymphocytes.
{"title":"On-Chip Pre-Treatment of Biological Samples for the Isolation of Adipose Stem Cells (ASCs)","authors":"M. Valette, Mathias Bouguelmouna, M. Mariotte, R. Courson, Marie-Charline Blatché, A. Girousse, C. Sengenès, K. Reybier, A. Gué","doi":"10.1109/TRANSDUCERS.2019.8808694","DOIUrl":"https://doi.org/10.1109/TRANSDUCERS.2019.8808694","url":null,"abstract":"This study presents the development of an original 2-steps Lab-on-chip that aims at isolating Adipose Stem Cells (ASCs), cells of considerable interest for regenerative medicine, from complex biological samples. Based on hydrodynamic filtration, the device pre-isolates ASCs by removing cells with a diameter below 10µm such as red blood cells or lymphocytes.","PeriodicalId":6672,"journal":{"name":"2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)","volume":"67 1","pages":"740-743"},"PeriodicalIF":0.0,"publicationDate":"2019-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89850201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：