Sensor Letters最新文献

{"title":"Fluorescent ZnO Quantum Dot Probe to Study Glucose–Glucose Oxidase Interaction via Fluorescence Resonance Energy Transfer","authors":"A. K. Verma, Z. Ansari","doi":"10.1166/sl.2020.4232","DOIUrl":"https://doi.org/10.1166/sl.2020.4232","url":null,"abstract":"In this work, emphasis is to utilize FRET method to analyze GOx and glucose interaction using fluorescent ZnO QDs as the probes. Fluorescent ZnO and ZnOext QDs were synthesized using sol– gel technique and green synthesis method as donor and acceptor nanoprobes.\u0000 Structural, optical and morphological characterization of QDS were carried out using UV-visible absorption, fluorescence, FTIR, XRD and field emission scanning electron microscopy. Band gap estimated from Tauc plot is 3.49 and 3.35 eV for ZnO and ZnOext QDs and XRD reveal Wurtzite\u0000 structure of grown crystals. Systematic absorption study for ZnO–GOx and ZnOext–GOx reveal association constant of –8.3361 M–1 and –2.57646 M –1 for ZnO and ZnOext using Benesi-Hildebrand\u0000 plot. The binding constant obtained from Stern-Volmer equation is 1.0466 μM –1 and 1.97 μM –1 for ZnO/ZnOext–GOx conjugate and suggest static quenching in the system. CD spectroscopy reveal native state\u0000 of protein in conjugate sytem. Constant Förster radius (Ro) in ZnOext–GOx system suggest the average 〈κ2〉 as 2/3 and is independent of donor–acceptor distance as normally assumed in FRET system varies\u0000 from ∼4.5% in ZnO–GOx and ∼5% in ZnOext–GOx system. It indicate better energy transferrin earlier system than formal. The physiological range of glucose from 60 mg–440 mg/dl using this technique in which ZnOext–GOx\u0000 as donor probe exhibit better response towards glucose than ZnO–GOx system and correlated to the presence of phyotochemicals on the QD surface.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"37 1","pages":"351-365"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81565929","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}

{"title":"Development of a New Nontoxic Thiazole Derivative Dye for Cell Labeling by Using Nanoparticles","authors":"Havva Nur Gurbuz, P. U. Arpaci, A. B. Sariguney, Erdal Kocabaş, A. Coşkun, E. Cagil","doi":"10.1166/sl.2020.4215","DOIUrl":"https://doi.org/10.1166/sl.2020.4215","url":null,"abstract":"Fluorescent labeling of L-929 fibroblast cells was studied by using newly synthesized ligand which was named as 2- N -methylamino-5-(pyrene-1-yl)-thiazole (ABS 40). The maximum fluorescence intensity of ABS 40 was detected at an excitation and emission wavelengths of 350 nm and 400\u0000 nm. Fluorescence intensity of the ligand was changed by the addition of DNA from calf thymus (CT-DNA) and human serum albumin (HSA). Both biomolecules and ABS 40 formed complexes that changed the fluorescence intensity of the ligand at the given wavelengths. Cytotoxicity tests were done with\u0000 XTT analysis. L-929 fibroblast cells were cultured in the presence of ABS 40 to show cell labeling. Results showed that ABS 40 at 318 μM was labeled the cells at an excitation wavelength of 403.7 nm by using confocal microscopy. in vivo cell labeling was also confirmed by\u0000 using Ct-DNA immobilized iron nanoparticles.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"4 1","pages":"293-298"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81352223","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}

{"title":"Improved Sensitivity of Dielectric Modulated Junctionless Transistor for Nanoscale Biosensor Design","authors":"Shradhya Singh, S. Bala, B. Raj, B. Raj","doi":"10.1166/sl.2020.4224","DOIUrl":"https://doi.org/10.1166/sl.2020.4224","url":null,"abstract":"This work has proposed a device i.e., Dielectric Modulated (DM) Junctionless Transistor which is utilizes as Label-Free (LF) electrical characteristic detection of bio-molecules. The electrical characteristics used for the detection of biomolecules are electric field, surface potential,\u0000 drain current and threshold voltage (Vth). Due to immobilization of biomolecules in the cavity region, the threshold voltage change in comparison to the absence of biomolecule, which is utilizes as the sensitivity metric. The sensitivity of biomolecule detection can be enhanced\u0000 by using asymmetric gate operation of the device. In asymmetric mode the degree of sensitivity is almost five times higher than that of the symmetric mode of operation.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"50 1","pages":"328-333"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89358676","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}

{"title":"A Rotation-Speed Measurement System Based on Magneto-Inductive Effect","authors":"Tao Wang, Bicong Wang, Yuyi Chen, Y. Luo","doi":"10.1166/sl.2020.4219","DOIUrl":"https://doi.org/10.1166/sl.2020.4219","url":null,"abstract":"There are few reports on high rotational speed measurement of brushless direct current (DC) motors based on giant magneto-inductive effect. In this study, a rotational speed measurement system based on giant magneto-inductive effect is established for measuring the rotational speeds\u0000 of DC motors. Successive sawtooth waves are found when rotating shaft is close to the GMI sensor. Through using the magneto-inductive sensing system, different high rotational speeds (1500∼24000 r/min) of the motor are accurately measured. Therefore, this giant magneto-inductive sensor\u0000 may be used for high rotational speed measurement of motors.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"83 2","pages":"299-303"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72473608","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}

{"title":"Porcelain Insulator Inspection Using Infrared Thermography","authors":"P. I. Lerantzis, P. Tsarabaris, N. Theodorou","doi":"10.1166/sl.2020.4229","DOIUrl":"https://doi.org/10.1166/sl.2020.4229","url":null,"abstract":"Inspection with thermography is a non-invasive, non-destructive process used in Power Systems facilities. Most temperature signatures that are not in the visible light range can be measured using thermal cameras, thus enabling the search of thermal behavior of porcelain insulators.\u0000 Overheating can help to detect problems, concerning the proper operation of insulators. The precision of temperature measurement using an infrared camera is influenced by the value of emissivity parameter that is set on camera. In the present study the influence of distance and angle between\u0000 the camera and the insulator on emissivity parameter value selection in camera is examined experimentally.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"10 13","pages":"288-292"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72489652","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}

{"title":"A Comprehensive Analysis of Various Structural Parameters of the Untreated Calcium Phosphate from Two Moroccan Mining Zones","authors":"Ikram Labtaini, K. El-hami","doi":"10.1166/sl.2020.4216","DOIUrl":"https://doi.org/10.1166/sl.2020.4216","url":null,"abstract":"X-ray diffraction (XRD) and Raman spectroscopy analyses were performed on untreated calcium phosphate samples of the two mining zones of Morocco: Benguerir and Khouribga. XRD has been examined for the determination of the structure parameters and their textures. However, a comparative\u0000 study was conducted between the two types of phosphate to implement the observed structural differences. XRD Results showed that the comparison between the two samples reveals significant differences at the level of the refinement parameters, crystallite size and microstrain but no changes\u0000 in the crystal system. Raman analysis assignments are given for powdered samples of the organically important compound, calcium phosphate, in the 0–3600 cm–1 range. The wavenumber positions of Raman bands were different and changed between the two different samples.\u0000 The results may be of significance in understanding the relationship between XRD analysis and the parameters of material structure.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86647868","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}

{"title":"Power Management in a Hybrid Grid Involving Photo Voltaic and Proton Exchange Membrane Fuel Cell","authors":"N. Shetty, R. L. Chakrasali","doi":"10.1166/sl.2020.4220","DOIUrl":"https://doi.org/10.1166/sl.2020.4220","url":null,"abstract":"The ever growing energy demand explored the generation of power by distributed resources. The distributed resources like photovoltaic, wind, fuel cell etc. are available in nature at free of cost. Photovoltaic cell is used to produce electrical energy by tracking energy from solar irradiation.\u0000 Perturbation and Observing method is one of the option to track the concentrated power from solar irradiation. It is a clean source, but intermittent in nature. This is overcome by integrating a fuel cell (FC), the new energy source. Proton Exchanging Membrane (PEM) fuel cell is integrated\u0000 with PV, and this hybrid DC source is integrated to micro grid using power electronic interfacing devices. The design of proper controller operation makes it to work in grid connected mode. The simulation is performed using Matlab-Simulink environment and results validates the performance\u0000 of hybrid system.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"29 1","pages":"259-267"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87141526","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}

{"title":"Quality Monitoring of Saccharum officinarum (Sugarcane) Using Image Analysis","authors":"Jayavanta Shakthi Poorna Sekar, R. Jayaparvathy","doi":"10.1166/sl.2020.4221","DOIUrl":"https://doi.org/10.1166/sl.2020.4221","url":null,"abstract":"The yield of the sugarcane depends on the quality of the seed used for plantation. The traditional methods of cultivation of sugarcane by cutting random sections of a stalk called sets and sowing them for propagation purposes result in quality degradation. When a defective sugarcane\u0000 part is used for propagation purposes poor quality sugarcanes are obtained. This results in wastage of a large number of resources used for cultivation purposes. In the paper, we propose an efficient method using image processing for determining the nodes of the sugarcane crop that are found\u0000 suitable for the propagation of good quality sugarcane. We present the design of a hardware prototype that automatically cuts and gives the cultivator a suitable node that has to be sowed for fresh cultivation. We validate the proposed method by determining the quality of fifty samples of\u0000 sugarcane stalks and observe that our method works with 93.62 percent efficiency.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"60 1","pages":"304-310"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72528633","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}

{"title":"Novel Mechatronic Sensors for Irregular Movements of Autonomous Land Vehicles","authors":"R. Boucetta, Radwen Bahri, Saloua Bel Hadj Ali","doi":"10.1166/sl.2020.4218","DOIUrl":"https://doi.org/10.1166/sl.2020.4218","url":null,"abstract":"In this paper, novel sensors using physical phenomena deduced from ultrasound waves are proposed to overcome problems of cost, availability and adaptability in the measure of position, velocity and tilt of Autonomous Land Vehicles. The true challenge for the Autonomous Land Vehicles\u0000 concerns essentially the accurate perception of hazardous environments to receive faithful information about reality. Current sensors used nowadays are viewed very expensive, complicated and unable to give accurate measures without time delay. For that, our contribution is located in this\u0000 context. At first, fundamental principle of ultrasonic waves and their specific physical properties are described to introduce their use in the proposed sensors. Mechatronic concepts of sensors are then detailed with the corresponding mathematical models. Indeed, online implementation and\u0000 real time experiences are conducted to verify the effectiveness of measurements.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"4 1","pages":"280-287"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74935336","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}

{"title":"A Multispectral Spectroscopic Based Sensing System for Quality Parameters Measurement in Raw Milk Samples","authors":"S. Srivastava, Abhai Tiwari, Pankaj Kumar, S. Sadistap","doi":"10.1166/sl.2020.4222","DOIUrl":"https://doi.org/10.1166/sl.2020.4222","url":null,"abstract":"Lactometer is used to monitor milk quality at various dairy centers but this may lead towards incorrect results because it requires human intervention and exact temperature correction as well as overall process is time-consuming. Presented work proposes the multispectral based spectroscopic\u0000 approach along with the comparative study of different chemometric and artificial neural network (ANN) based techniques to measure different milk quality parameters. A multispectral spectroscopic sensing module has been designed using off the shelf components and further interfaced with 8-bit\u0000 microcontroller based embedded system to produce three different spectrums of transmittance and scattering at +90 degree and –90 degree over the wavelength range of 340–1030 nm. Data acquisition process has been performed for 150 milk samples (cow, buffalo, and mix) collected from\u0000 the bulk milk cooling center (BMC), Jaipur. Different statistical modeling techniques such as principle component regression (PCR), multiple linear regression (MLR) and partial least square regression (PLSR) have been implemented to develop correlation models between extracted features and\u0000 target milk parameters. Implemented techniques have been compared based on the accuracy of their prediction models and it has been observed that PLSR shows better results compared to other two techniques. ANN-based modeling approach also has been explored to improve the accuracy of results.\u0000 Five different artificial neural networks (ANN) based modeling techniques (LevenbergMarquardt, Bayesian regulation, scaled conjugate gradient, gradient descent and resilient) have been used to predict targeted milk quality parameters. Out of them, Gradient descent modeling technique performs\u0000 better to predict fat content of the milk (R2 = 0.96198), Bayesian regulation performs better to predict lactose content (R2 = 0.90594) and others (solid non-fat (SNF), protein) are just satisfactory (R2 = 0.76077 for SNF using scaled conjugate\u0000 gradient, R2 = 0.41935 for protein using Levenberg Marquardt). Produced results are validated with the MilkoScan FT1 system installed at Rajasthan Corporation of Dairy Federation (RCDF), Jaipur and it has been observed that results presented higher order of coefficient of\u0000 determination as mentioned above (except protein, S.N.F.). A smartphone-based android application also has been developed to acquire data from the embedded system using Bluetooth protocol and transfer to cloud with the location information for further analysis.","PeriodicalId":21781,"journal":{"name":"Sensor Letters","volume":"30 1 1","pages":"311-321"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85479268","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}