Sensors and Actuators A-physical最新文献_第4页

A tip-tilt-piston piezoelectric micromirror with double-S shaped actuators based on sputtered PZT 一种基于溅射PZT的双s形压电微镜

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-05 DOI: 10.1016/j.sna.2025.116666

Ke Cao , Qincheng Zheng , Hao Chen , Bo Xie , Ning Deng , Hui Shang , Yao Lu , Huikai Xie

{"title":"A tip-tilt-piston piezoelectric micromirror with double-S shaped actuators based on sputtered PZT","authors":"Ke Cao , Qincheng Zheng , Hao Chen , Bo Xie , Ning Deng , Hui Shang , Yao Lu , Huikai Xie","doi":"10.1016/j.sna.2025.116666","DOIUrl":"10.1016/j.sna.2025.116666","url":null,"abstract":"<div><div>To address the issues related to the structural constraints, thin-film stresses, and limited piezoelectric coefficients in tip-tilt-piston (TTP) piezoelectric micromirrors, a double-S-shaped piezoelectric actuator design is proposed to construct a TTP piezoelectric micromirror based on low-stress sputtered PZT thin film. A TTP piezoelectric micromirror with a 1 mm× 1 mm optical aperture has been designed, fabricated, and tested. The double-S piezoelectric actuator design enables large displacement. The sputtered PZT thin film exhibited relatively low stress of about 30 MPa. The maximum initial elevation of the double-S actuators was only about 10 μm. The maximum vertical displacement reached 41 μm at the frequency of 3.5 kHz. Under a driving voltage of 30 Vac at a resonant frequency of nearly 6.2 kHz, the tip and tilt optical scanning angles reach 16.2° and 15.6°, respectively. This high-frequency TTP micromirror, with a large optical aperture and scanning range, holds promise for various applications, especially in medical endoscopic imaging and optical phase modulation.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116666"},"PeriodicalIF":4.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A sensor based on multilayer-arranged Hall elements for MFL detection of broken wires in bridge cables 基于多层排列霍尔元件的桥式电缆断线漏磁检测传感器

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-05 DOI: 10.1016/j.sna.2025.116668

Lingsi Sun, Junjie Wang, Zhiwei Tao, Shuyu Duan, Xinjun Wu

{"title":"A sensor based on multilayer-arranged Hall elements for MFL detection of broken wires in bridge cables","authors":"Lingsi Sun, Junjie Wang, Zhiwei Tao, Shuyu Duan, Xinjun Wu","doi":"10.1016/j.sna.2025.116668","DOIUrl":"10.1016/j.sna.2025.116668","url":null,"abstract":"<div><div>Non-destructive testing (NDT) of cable-supported bridges is crucial for ensuring their safe and reliable operation. However, detecting internal broken wires using traditional Magnetic Flux Leakage (MFL) testing remains a challenge due to the low Signal-to-Background Ratio (SBR). To address this issue, this paper proposes a novel sensor composed of multilayer-arranged Hall elements (MAHE) based on the Radial Differential Magnetic Flux Leakage (RDMFL) principle, aiming for effective detection of broken wires at various depths within the cable. The RDMFL method detects damage by superimposing the differences in magnetic flux density measured at multiple radial points and identifying local peaks in the combined signals. A theoretical expression for the RDMFL signal is derived, and the influence of MAHE sensor structural parameters on both SBR and amplitude enhancement of broken wire signals is analyzed. Finite element simulations are used to verify performance improvements and identify the optimal structural parameters. Experimental results on a cable specimen demonstrated that the MAHE sensor-equipped testing system effectively detected single broken wires positioned in layers 1–7 of a PES7–127 specification cable (comprising 127 steel wires, each with a 7 mm diameter). Meanwhile, a preliminary image of all broken wires within the cable specimen was generated, providing a clear magnetic field visualization of the damages. Finally, the detection capability of the MAHE sensor was analyzed using a Receiver Operating Characteristic (ROC) curve, and the optimized threshold for identifying broken wires was determined.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116668"},"PeriodicalIF":4.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Surface plasmon resonance of nanometer Ag-Cu alloy layers on Blu-ray and DVD disks 蓝光和DVD光盘上纳米Ag-Cu合金层的表面等离子体共振

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-05 DOI: 10.1016/j.sna.2025.116660

Rand Abboud , Saeed Mirzanejhad , Soodabeh Nouri Jouybari , Majid Eshghabadi

引用次数: 0

Scalable frequency selective microwave-assisted reactor setup for organic synthesis 可扩展的频率选择微波辅助反应器设置有机合成

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-05 DOI: 10.1016/j.sna.2025.116665

Matko Martinic , Laura Y. Vázquez-Amaya , Marie Mertens , Upendra K. Sharma , Erik V. Van der Eycken , Guy A.E. Vandenbosch , Bart Nauwelaers , Tomislav Markovic

{"title":"Scalable frequency selective microwave-assisted reactor setup for organic synthesis","authors":"Matko Martinic , Laura Y. Vázquez-Amaya , Marie Mertens , Upendra K. Sharma , Erik V. Van der Eycken , Guy A.E. Vandenbosch , Bart Nauwelaers , Tomislav Markovic","doi":"10.1016/j.sna.2025.116665","DOIUrl":"10.1016/j.sna.2025.116665","url":null,"abstract":"<div><div>In this study, a novel scalable microwave-assisted reactor setup is introduced that combines four Complementary Split Ring Resonators (CSRRs) operating at multiple frequencies (2, 4, 6, and 8 GHz) with a microfluidic cell, achieving high-temperature uniformity and precise in-situ temperature measurements for microwave-assisted organic synthesis. The reactor achieves high-temperature uniformity according to both COMSOL simulations and temperature measurements validated using the temperature-dependent fluorescent dye Rhodamine B. Precise in-situ temperature readings are obtained using a single temperature sensor located in the center of the microfluidic reactor. Four heaters were characterized using both polar and non-polar solvents, showing a maximum heating rate of 153 °C/s with a 5 W incident microwave (MW) heating power. Finally, the scalability of the proposed setup was investigated using a power divider and a MW Single Pole, Double Throw (SPDT) switch with reactors operating at the same and various frequencies for a multistep synthesis or double the throughput. The two scalability options are compared in terms of the applied power and the ability to reach distinct temperatures for the reactors working at the same or various frequencies. These findings highlight the potential of the proposed approach to overcome scalability and precise temperature measurement challenges associated with planar MW heaters and advance the efficiency and repeatability of chemical synthesis.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116665"},"PeriodicalIF":4.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Frequency-selective acoustic sensing using circular PVDF-based artificial basilar membranes 基于圆形pvdf人造基底膜的频率选择性声传感

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-05 DOI: 10.1016/j.sna.2025.116633

Behrouz Aghajanloo, Sajad A. Moshizi, Mohsen Asadnia, Christopher Pastras

{"title":"Frequency-selective acoustic sensing using circular PVDF-based artificial basilar membranes","authors":"Behrouz Aghajanloo, Sajad A. Moshizi, Mohsen Asadnia, Christopher Pastras","doi":"10.1016/j.sna.2025.116633","DOIUrl":"10.1016/j.sna.2025.116633","url":null,"abstract":"<div><div>Understanding and replicating the natural frequency selectivity of the cochlea is critical for advancing hearing devices and biomimetic acoustic sensors. This study presents a circular artificial basilar membrane (CABM) as a piezoelectric acoustic sensor inspired by the tonotopic frequency selectivity of the basilar membrane in the cochlea. The sensor integrates four distinct PVDF thin films into a single robust platform, enabling simultaneous multi-frequency detection. The sensor operates across a biologically relevant frequency range of 100–3000 Hz, covering essential human speech and environmental sound frequencies. A major challenge in biomimetic acoustic sensing is achieving frequency selectivity while maintaining a conformal and scalable design. This study addresses this by optimizing membrane geometry, device design, and experimental configurations. Additionally, minimizing wave reflection, diffraction, and entrapment effects required systematic optimization of sensor positioning and testing conditions. This research integrates analytical modeling, numerical simulations, and experimental validation to investigate membrane dynamics. Resonance frequencies were derived using acoustic principles, refined through Finite Element Method (FEM) simulations, and validated via Laser Doppler Vibrometry (LDV). The effects of membrane diameter, sound intensity, source distance, and sound direction were analyzed to characterize sensor behavior. The successful integration of the four-channel CABM system, mimicking the cochlea’s tonotopic behavior, marks a step forward in artificial cochlear devices. This work demonstrates a scalable and compact solution for multi-frequency acoustic sensing, with potential applications in cochlear implants, speech recognition, and bio-inspired auditory systems.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116633"},"PeriodicalIF":4.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Redesigning finite metasurfaces for enhanced energy harvesting with lead-free (K, Na)NbO3 ceramics

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-05 DOI: 10.1016/j.sna.2025.116663

Hyung Jin Lee , Seung Il Kim , Dong Hwi Kim , Hong Min Seung , Miso Kim

{"title":"Redesigning finite metasurfaces for enhanced energy harvesting with lead-free (K, Na)NbO3 ceramics","authors":"Hyung Jin Lee , Seung Il Kim , Dong Hwi Kim , Hong Min Seung , Miso Kim","doi":"10.1016/j.sna.2025.116663","DOIUrl":"10.1016/j.sna.2025.116663","url":null,"abstract":"<div><div>Metasurfaces provide a transformative platform for enhancing energy harvesting by enabling efficient energy localization and amplification in a compact structure. Despite this potential, current research largely focuses on numerical and analytical methods, with limited experimental studies comparing the outputs of piezoelectric energy harvesters integrated with metasurfaces. This often leads to design discrepancies that undermine energy amplification efficacy. This study proposes an optimal metasurface redesign to maximize energy amplification with lead-free (K, Na)NbO<sub>3</sub> (KNN) ceramic-based piezoelectric energy harvesters. Our novel metasurface design is effective in real-world vibration environments, such as railways and water pumps. Results show that integrating eco-friendly KNN energy harvesters into enhanced flexural vibration fins necessitates this redesign, achieving over 20.6 times greater power output than the original design. Additionally, the choice between soft and hard lead-free KNN ceramics significantly influences electromechanical coupling and experimental amplitude, with soft ceramics offering considerable advantages for energy harvesting. This research highlights the importance of a tailored metasurface redesign, enhancing the efficiency of energy harvesting systems and supporting practical applications in sustainable energy technologies.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116663"},"PeriodicalIF":4.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Investigation of an electrical-field-based allergen biosensor utilizing selective polyvinyl chloride membranes for histamine detection 利用选择性聚氯乙烯膜进行组胺检测的电场过敏原生物传感器的研究

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-05 DOI: 10.1016/j.sna.2025.116603

Yu-Ru Huang , Wei-Cheng Lin , Shang-Chun Chou , Yun-Yu Hsieh , Wei-Lun Yen , Bing-Hong Chen , Chien-Hung Liao

{"title":"Investigation of an electrical-field-based allergen biosensor utilizing selective polyvinyl chloride membranes for histamine detection","authors":"Yu-Ru Huang , Wei-Cheng Lin , Shang-Chun Chou , Yun-Yu Hsieh , Wei-Lun Yen , Bing-Hong Chen , Chien-Hung Liao","doi":"10.1016/j.sna.2025.116603","DOIUrl":"10.1016/j.sna.2025.116603","url":null,"abstract":"<div><div>In this study, we developed an electrical-field based biosensor with a Polyvinyl Chloride membrane designed for precise histamine quantification. By employing the lab’s high sensitivity readout circuitry in conjunction with an advanced double cancellation offset comparator, the biosensor demonstrates robust linearity across histamine concentrations ranging from 0.1 μM to 300 μM. The sensor exhibits a sensitivity of 4.2 analog-to-digital (ADC) counts per μM (corresponding to 10.25 mV/μM) and detects a 61.6 % variation in response when histamine interacts with diamine oxidase (DAO). In comparison, the traditional cyclic voltammetry (CV) method shows only a 3.8 % change. This minimal difference underscores the difficulty of accurately distinguishing variations in histamine levels using the CV approach. The proposed biosensor's high sensitivity and specificity to histamine make it well-suited for on-site inspections and portable use in food and fish markets, facilitating early screening and mitigation of histamine-related health risks.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116603"},"PeriodicalIF":4.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Surface plasmon resonance sensor tailored to detect dielectric constants within the range of synthetic polymers 表面等离子体共振传感器定制检测介电常数范围内的合成聚合物

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-03 DOI: 10.1016/j.sna.2025.116656

Natalia A. Gutierrez Andrade, Yunfeng Nie, Wendy Meulebroeck, Heidi Ottevaere

{"title":"Surface plasmon resonance sensor tailored to detect dielectric constants within the range of synthetic polymers","authors":"Natalia A. Gutierrez Andrade, Yunfeng Nie, Wendy Meulebroeck, Heidi Ottevaere","doi":"10.1016/j.sna.2025.116656","DOIUrl":"10.1016/j.sna.2025.116656","url":null,"abstract":"<div><div>Plastic pollution poses a significant environmental concern; however, current methods for identifying and characterising synthetic polymers often require time-consuming procedures or rely on sample degradation. This study demonstrates the direct detection of a broad range of synthetic polymers using Surface Plasmon Resonance (SPR). By tailoring the prism design in the Kretschmann configuration, we extended the dynamic refractive index range of the sensor to encompass typical polymer refractive indices (∼1.49–1.58). Initial validation with refractive index oils confirmed the prism’s ability to detect materials within this range. Subsequently, SPR curves were obtained for nine different polymers, each exhibiting distinctive resonance shifts that may enable polymer-specific identification. Notably, these results also demonstrate SPR’s capability to detect pigmented materials, which is often challenging using other techniques. This direct detection strategy avoids the need for complex spectra analysis procedures, thereby improving measurement efficiency. Finally, we present the potential integration of SPR imaging to explore additional parameters of plastic pollution, paving the way for more comprehensive environmental monitoring and assessment. Our approach holds promise for advancing polymer analysis with SPR by decreasing the analysis time using a direct detection method and expanding the range of materials that can be analysed.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116656"},"PeriodicalIF":4.1,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Research and experimental verification of broadband beam pattern design method for compact transmitting transducer array 紧凑型发射换能器阵列宽带波束方向图设计方法研究与实验验证

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-03 DOI: 10.1016/j.sna.2025.116610

Hong Xu , Zhengyao He , Qiang Shi

{"title":"Research and experimental verification of broadband beam pattern design method for compact transmitting transducer array","authors":"Hong Xu , Zhengyao He , Qiang Shi","doi":"10.1016/j.sna.2025.116610","DOIUrl":"10.1016/j.sna.2025.116610","url":null,"abstract":"<div><div>The broadband compact transmitting array has more complex amplitude and phase characteristics as well as array element consistency compared to the narrowband transducer array, resulting in limited broadband transmitting performance. To solve this problem, the space-frequency response matrix is proposed to design broadband beam patterns of the compact transmitting array. First, since the broadband signal can be decomposed into the superposition of narrowband signals, the broadband space-frequency response matrix can be derived after expanding the spatial response of the compact transmitting array accordingly. Then, the radiated acoustic field of the transducer array can be equivalent to a generalized channel, therefore, orthogonal frequency division multiplexing signals are used to quickly measure the space-frequency response matrix of the compact transmitting array in an anechoic water tank. Finally, the constant beamwidth beamforming method that can suppress side lobes has been developed according to the measured space-frequency response matrix, and the designed broadband transmitting beam patterns are also measured in an anechoic water tank. The experimental results show that the proposed method can significantly reduce side lobe levels and improve the broadband transmitting directivity of the compact transducer array.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116610"},"PeriodicalIF":4.1,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Piezoelectric sensor characterization for structural strain measurements 用于结构应变测量的压电传感器特性

IF 4.1 3区工程技术

Sensors and Actuators A-physical Pub Date : 2025-05-03 DOI: 10.1016/j.sna.2025.116659

Aliakbar Ghaderiaram, Navid Vafa, Erik Schlangen, Mohammad Fotouhi

{"title":"Piezoelectric sensor characterization for structural strain measurements","authors":"Aliakbar Ghaderiaram, Navid Vafa, Erik Schlangen, Mohammad Fotouhi","doi":"10.1016/j.sna.2025.116659","DOIUrl":"10.1016/j.sna.2025.116659","url":null,"abstract":"<div><div>Accurate and reliable strain measurement is essential for effective condition monitoring of engineering structures. This study presents an analytical and experimental investigation into the performance of piezoelectric sensors for structural strain measurements, evaluating the effect of attachment strategy and the properties of the substrate and the sensor. Lead zirconate titanate (PZT) and polyvinylidene fluoride (PVDF) sensors were evaluated in two attachment configurations: Fully Attached (FA) and Two-End Attached (TEA). A voltage-strain relationship was developed based on principles of piezoelectricity, electrical circuit modelling, and solid mechanics. Results indicate that sensor performance is significantly influenced by the attachment method. Specifically, the TEA configuration reduced the impact of substrate properties and improved uniaxial strain measurement accuracy by up to 32 % compared to the FA configuration. The FA configuration exhibited sensitivity to the substrate's Poisson ratio, leading to a nonlinear voltage-strain response. In contrast, the TEA configuration provided pure uniaxial strain measurements by reducing the effects of shear lag and substrate elasticity. These findings provide a comprehensive approach to using piezoelectric sensors for structural strain measurement, allowing for the placement of sensors on various substrates without the need for calibration by effectively utilizing sensor and substrate properties along with the attachment strategy. The study provides a novel analytical–experimental comparison of sensor attachment methods, showing how TEA significantly improves uniaxial strain accuracy and reduces substrate dependency in piezoelectric strain measurements.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"391 ","pages":"Article 116659"},"PeriodicalIF":4.1,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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