Academic literature on the topic 'Scanner in chemistry'
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Journal articles on the topic "Scanner in chemistry"
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Burde, Alexandru Victor, Marius Manole, Radu-Septimiu Campian, Cosmin Sinescu, and Sorana Baciu. "In vitro Comparison of Accuracy of Two Scanners Used in Dental Medicine." Revista de Chimie 70, no. 7 (August 15, 2019): 2344–46. http://dx.doi.org/10.37358/rc.19.7.7336.
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This experimental study aims to highlight and compare the resolution and accuracy (trueness and fidelity) of an intraoral scanner and a laboratory scanner. In order to achieve the aim of this study, an experimental model consisting of a die with a standard preparation for a porcelain-fused to metal crown was manufactured from a physiognomic polymethylmethacrylate resin. The experimental model was scanned with an industrial CT to obtain the virtual reference model. Then, the die was scanned 15 times with each scanner. In order to asses trueness, comparisons were made with the virtual reference model, and for fidelity, the first scan in the series was compared with the following scans. In regards to the trueness of the scanners, the average deviation for the laboratory scanner is 4.31 and 17.34 mm for the intraoral scanner. When comparing the serial scannings� of the same die, the lowest recorded deviation is 6.4 mm for the laboratory scanner and 21.57mm for the intraoral scanner. For both fidelity and trueness, the F test demonstrates that there is a statistically significant difference between the scanners and the applied T-tests confirm the lower degree of error-rate generation by the laboratory scanner. The dimensional limitations imposed for the intraoral scanners have a direct consequence on their trueness and fidelity when compared to their laboratory counterparts.
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Bohner, Lauren, Daniel Habor, Klaus Radermacher, Stefan Wolfart, and Juliana Marotti. "Scanning of a Dental Implant with a High-Frequency Ultrasound Scanner: A Pilot Study." Applied Sciences 11, no. 12 (June 14, 2021): 5494. http://dx.doi.org/10.3390/app11125494.
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The purpose of this in vitro study was to assess the trueness of a dental implant scanned using an intraoral high-frequency ultrasound prototype and compared with conventional optical scanners. An acrylic resin cast containing a dental implant at position 11 was scanned with a fringe projection 3D sensor for use as a reference dataset. The same cast was scanned 10 times for each group. Ultrasound scanning was performed with a high-frequency probe (42 MHz, aperture diameter of 4 mm and focus length of 8 mm), and 3D images were reconstructed based on the depth of each surface point echo. Optical scans were performed in a laboratory and with an intraoral scanner. A region of interest consisting of the dental implant site was segmented and matched to the reference dataset. Trueness was defined as the closeness between experimental data and the reference surface. Statistical analysis was performed with one-way ANOVA and post-hoc tests with a significance level of p = 0.05. No statistical difference was found among the evaluated scanners. The mean deviation error was 57.40 ± 17.44 µm for the ultrasound scanner, 75.40 ± 41.43 µm for the laboratory scanner and 38.55 ± 24.34 µm for the intraoral scanner. The high-frequency ultrasound scanner showed similar trueness to optical scanners for digital implant impression.
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Khan, Zohaib, Faisal Shafait, and Ajmal Mian. "Converting a Common Low-Cost Document Scanner into a Multispectral Scanner." Sensors 19, no. 14 (July 20, 2019): 3199. http://dx.doi.org/10.3390/s19143199.
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Forged documents and counterfeit currency can be better detected with multispectral imaging in multiple color channels instead of the usual red, green and blue. However, multispectral cameras/scanners are expensive. We propose the construction of a low cost scanner designed to capture multispectral images of documents. A standard sheet-feed scanner was modified by disconnecting its internal light source and connecting an external multispectral light source comprising of narrow band light emitting diodes (LED). A document was scanned by illuminating the scanner light guide successively with different LEDs and capturing a scan of the document. The system costs less than a hundred dollars and is portable. It can potentially be used for applications in verification of questioned documents, checks, receipts and bank notes.
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Bucuresteanu, Anca, Dan Prodan, and Adrian Motomancea. "Execution of Plastic Parts Using 3D Scanners and 3D Printers." Materiale Plastice 55, no. 2 (June 30, 2018): 215–18. http://dx.doi.org/10.37358/mp.18.2.4998.
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In this paper, the authors show a part of research works performed on the use of 3D scanners and 3D printers to execute plastic parts with complex surfaces. 3D scanning allows copying of certain surfaces in our environment, based on existing models. Scanned models may represent various objects, made of a wide range of materials: metals, ceramics, fabrics, plastics, leather, organic materials etc. [1]. This paper shows the results achieved using a scanner and a common and affordable - low-price - printer. 3D scanners and printers allow execution of clones of certain parts with irregular surfaces.
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Burde, Alexandru Victor, Cristina Gasparik, Marioara Moldovan, Sorana Baciu, and Cosmin Cosma. "In vitro Evaluation of Accuracy of Single Dies Captured by Two Intraoral Digital Scanners." Materiale Plastice 55, no. 2 (June 30, 2018): 176–78. http://dx.doi.org/10.37358/mp.18.2.4988.
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The objective of this in-vitro study was to compare the accuracy, defined as trueness and precision, of two intraoral digital scanners that use different capturing techniques. An experimental reference object consisting of a die was manufactured from a PMMA resin. The reference object was digitized with an industrial CT and was scanned 15 times with each scanner. In order to asses trueness, comparisons were made with the virtual reference model, and for fidelity, the first scan in the series was compared with the following scans. For both fidelity and trueness, the F test and T tests demonstrate that there is a statistically significant difference between the scanners.
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Nam, Na-Eun, Seung-Ho Shin, Jung-Hwa Lim, Bora Lee, June-Sung Shim, and Jong-Eun Kim. "Accuracy of Implant Position Reproduction According to Exposed Length of the Scan Body during Optical Scanning: An In Vitro Study." Applied Sciences 11, no. 4 (February 13, 2021): 1689. http://dx.doi.org/10.3390/app11041689.
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Accuracy of implant position reproduction according to various types of scanners, implant placement depths, and tooth positions are unknown. The purpose of this study was to compare the accuracy of implant position reproduction for differences in the exposed length of the implant scan body according to scanner type and tooth position. Implants were placed at the positions of the lateral incisor, first premolar, and first molar in the study model at the bone level and submerged 1.5 mm, 3.0 mm, 4.5 mm, and 6.0 mm. The completed models were scanned with one type of tabletop scanner and three types of intraoral scanners (TRIOS 3, i500, and CS3600). A matching process was performed for all scan data to superimpose abutment library data on the scan body, and the root mean square errors were analyzed in three dimensions to evaluate the position reproducibility of the replaced abutment library. In the trueness analysis, the error increased rapidly for an implant placement depth of 4.5 mm, and was largest for a submersion of 6.0 mm. The precision analysis confirmed that the error increased for depths of at least 3.0 mm. The analysis by position identified that the accuracy was lowest for an implant placed at the position of the lateral incisor. These findings indicate that special care is required when making an impression of a deep implant with an optical scanner.
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Tóth, Teodor, Patrik Varga, Branko Štefanovič, Lucia Bednarčíková, Marek Schnitzer, Radovan Hudák, and Jozef Živčák. "Accuracy Verification of an Anatomical Model Manufactured Using Low-Cost Additive Production." Applied Sciences 11, no. 2 (January 9, 2021): 594. http://dx.doi.org/10.3390/app11020594.
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The paper deals with the separation of the third cervical vertebra using the software VGStudio MAX, Mimics, and inVesalius. During the separation, various parameters of the threshold were used to determine the effect. The comparison of models from Mimics and inVesalius to VGStudio MAX showed that the cumulative variance distribution for 95% surface coverage is less than 0.935 mm. When comparing medically oriented software, Mimics and inVesalius, the deviation was less than 0.356 mm. The model was made of polylactic acid (PLA) material on a low-cost 3D printer, Prusa i3 MK2.5 MMU1. The printed model was scanned by four scanners: Artec Eva, 3Shape D700, Steinbichler Comet L3D, and Creaform EXAscan. The outputs from the scanners were compared to the reference model (standard tessellation language (STL) model for 3D printing) as well as to the scanner with the best accuracy (3Shape). Compared to the publications below, the analysis of deviations was evaluated on the entire surface of the model and not on selected dimensions. The cumulative variance distribution for comparing the output from the 3D scanner with the reference model, as well as comparing the scanners, shows that the deviation for 95% of the surface coverage is at the level of 0.300 mm. Since the model of the vertebra is planned for education and training, the used software and technologies are suitable for use in the design and the production process.
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Motomancea, Adrian, Anca Bucuresteanu, and Dan Prodan. "Execution of Non-Metallic or Metallic Duplicates, Cast with 3D Scanners and 3D Printers." Materiale Plastice 56, no. 1 (March 30, 2019): 6–10. http://dx.doi.org/10.37358/mp.19.1.5113.
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In this paper, the authors show a part of research works performed on the use of 3D scanners and 3D printers to execute the molds required for the cast of parts with complex surfaces. 3D scanning allows copying of certain surfaces in our environment, based on existing models. The finished parts may also be executed from metals that are relatively easy to cast (bronze, aluminum etc.). In order to execute the molds destined for the casting, various pieces may be scanned, with a volume size in the range of [150x150x200 mm3 ÷ 500x500x2000 mm3]. Plastic model printing is performed depending on the capacity of the 3D printer used. This paper shows the results achieved with general-purpose scanner and printer, valued at affordable prices.
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Pantea, Mihaela, Robert Ciocoiu, Ana Maria Cristina Tancu, Daniela-Mădălina Nină, Alexandru Petre, Iulian Vasile Antoniac, and Marina Melescanu-Imre. "Comparative Study on Two Methods Used in Obtaining 3D Printed Dental Models." Materiale Plastice 56, no. 4 (December 30, 2019): 812–16. http://dx.doi.org/10.37358/mp.19.4.5270.
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The purpose of this study was to assess the accuracy of two 3D printed dental models manufactured after intraoral/IO and extraoral/EO scanning. A dental study model (KaVo Dental GmbH/Germany) was used as a reference for this research; this model was scanned with an industrial scanner (XT H 225 ST/Industrial CT scan/Nikon Metrology Inc./U.S.A.) and a reference STL file was generated (coded M1). Two 3D printed models (Form2/FormLabs Inc./U.S.A.) were produced via IO scanning (TRIOS 3 Battery Cart/3 Shape/Denmark), respectively via EO scanning (Swing Dental Scanner/Dof Inc./South Korea) of the reference dental model. The 3D printed models obtained were scanned with the industrial scanner, resulting in other two STL files (coded M2, respectively M3). All the STL files obtained (reference M1; M2; M3) were compared in pairs, using a 3D analysis software. Good results were achieved in obtaining 3D printed dental models via IO or EO scanning, yet, the 3D printed dental model obtained via IO scanning (M3) showed slightly improved dimensional compatibility with the reference model (M1) in comparison with the 3D printed dental model manufactured via EO scanning (M2).
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Ozaki, Takashi, Norikazu Ohta, and Motohiro Fujiyoshi. "Wide Two-Degree-of-Freedom Static Laser Scanner with Miniaturized Transmission Mechanism and Piezoelectric Actuation." Sensors 21, no. 18 (September 10, 2021): 6077. http://dx.doi.org/10.3390/s21186077.
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In recent years, laser scanners have attracted significant attention for applications such as laser radars. However, the establishment of a two-degree-of-freedom scanner that can quasi-statically drive a large mirror with a large deflection angle has proven to be challenging. In this paper, we propose a laser scanner design and fabrication method by combining two unimorph piezoelectric actuators composed of piezoelectric single-crystal Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 and a miniature translation-rotation conversion mechanism with flexible polyimide hinges. The size of the entire scanner was 32 mm × 12 mm × 10 mm. We successfully demonstrated that the scanner could achieve a large quasi-static mechanical deflection angle amplitude of 20.5° in two axes with a 6-mm-square mirror.
Dissertations / Theses on the topic "Scanner in chemistry"
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Reis, Josiane Amorim, and 92-99125-7184. "Uso de imagens digitais para determinação quantitativa de metanol em bebidas alcoólicas." Universidade Federal do Amazonas, 2017. http://tede.ufam.edu.br/handle/tede/6239.
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FAPEAM - Fundação de Amparo à Pesquisa do Estado do Amazonas
Concerned about sustainability, analytical chemists have developed chemical analysis procedures that aim to minimize the consumption of reagents and samples combined with the reduction of operating costs. Thus, in recent years, Digital Image Based (DIB) methods have often been used as an alternative to quantitative determinations in analytical chemistry, especially in samples of environmental interest, food, beverages and drugs. This work proposes a method based on digital images for the determination of methanol in alcoholic beverages. The proposed system uses a scanner to acquire images generated according to the RGB (Red, Green, Blue) system. The determination of methanol is based on an oxidation reaction of methanol. After the reaction an image is captured and a region of the image is selected for decomposition of the pixels into the values of the RGB components. The analytical curve is obtained by relating the logarithm of the ratio between the white solution standard and the norm of the calibration solutions as a function of the concentrations of these solutions. The methanol content was determined in (mL / 100 mL of anhydrous alcohol) in the samples of cachaça, brandy and liqueur of jambú, cupuaçu and cocoa. In order to illustrate the viability of the proposed method, analyzes were performed on seven beverage samples. The results were compared with those obtained by spectrophotometry and when applying the paired t-test it was found that there was no statistically significant difference between the results obtained with the two methods at a 95% confidence level.
Preocupados com a sustentabilidade os químicos analíticos têm desenvolvido procedimentos de análise química que visam minimizar o consumo de reagentes e amostras aliadas a redução de custos operacionais. Dessa forma, nos últimos anos os métodos Baseados em Imagens Digitais (DIB) têm sido frequentemente usados como uma alternativa para determinações quantitativas em química analítica, principalmente em amostras de interesse ambiental, alimentícios, bebidas e fármacos. Neste trabalho propõe se um método baseado em imagens digitais para determinação de metanol em bebidas alcoólicas. O sistema proposto usa um scanner para aquisição das imagens geradas de acordo com o sistema RGB (Red, Green, Blue). A determinação do metanol é baseada em uma reação de oxidação do metanol. Após a reação uma imagem é capturada e uma região da imagem é selecionada para decomposição dos pixels nos valores das componentes RGB. A curva analítica é obtida relacionando o logaritmo da razão entre a norma da solução do branco e a norma das soluções de calibração em função das concentrações dessas soluções. O teor de metanol foi determinado em (mL/ 100mL de álcool anidro) nas amostras de cachaça, aguardente, licor de jambú, cupuaçu e cacau. A fim de ilustrar a viabilidade do método proposto, foram realizadas analises em sete amostras de bebidas. Os resultados foram comparados com os obtidos por espectrofotometria e ao se aplicar o teste t emparelhado verificou-se que não há estatisticamente diferença significativa entre os resultados obtidos com os dois métodos para um nível de 95% de confiança.
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Hsiao, Chih-Wei. "Continuously-scanned Raman excitation profiles for ozone excited in the Hartley band." Thesis, 2000. http://hdl.handle.net/1911/19508.
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Improvements in the determination of the continuously-scanned Raman excitation profiles (REP's) are described. The continuous-scanning technique is applied to ozone excited in the first continuum (the Hartley band). The Rayleigh excitation profile, which is required for intensity calibration, is obtained simultaneously. A theoretical calculation for the ozone Rayleigh excitation profile is also provided for comparison. REP measurements of the vibrational features up to 6 quanta are determined in the wavelength range of 238--271 nm. These spectra show oscillatory structures that are qualitatively but unambiguously identified as the Raman counterparts of those in the absorption spectrum. The use of overlapping dye mixtures to cover most of the Hartley band is required. Difficulties encountered in patching together these first-generation spectra are discussed in detail.
Books on the topic "Scanner in chemistry"
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Narayana, Shalini, Babak Saboury, Andrew B. Newberg, Andrew C. Papanicolaou, and Abass Alavi. Positron Emission Tomography. Edited by Andrew C. Papanicolaou. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199764228.013.8.
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Positron emission tomography (PET) is an imaging method that utilizes compounds labeled with positron-emitting radioisotopes as molecular probes to evaluate different neurophysiological processes quantitatively and noninvasively. This chapter provides a background regarding positron emission, radiotracer chemistry, and detector and scanner instrumentation, as well as analytical methods for evaluating basic brain physiology, such as cerebral blood flow and oxygen and glucose metabolism. The methodological aspects of PET imaging, such as patient preparation and optimal scanning parameters, are discussed. Examples of application of blood flow and metabolic imaging in both research and clinical scenarios for the evaluation of normal neurophysiology are provided. Recent advances in PET imaging, including PET-CT and PET-MRI, are also described. Finally, the unique strengths of PET imaging are highlighted.
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Chen, C. Julian. Introduction to Scanning Tunneling Microscopy. 3rd ed. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198856559.001.0001.
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The scanning tunnelling microscope (STM) was invented by Binnig and Rohrer and received a Nobel Prize of Physics in 1986. Together with the atomic force microscope (AFM), it enables non-destructive observing and mapping atoms and molecules on solid surfaces down to a picometer resolution. A recent development is the non-destructive observation of wavefunctions in individual atoms and molecules, including nodal structures inside the wavefunctions. STM and AFM have become indespensible instruments for scientists of various disciplines, including physicists, chemists, engineers, and biologists to visualize and utilize the microscopic world around us. Since the publication of the first edition in 1993, this book has been recognized as a standard introduction for everyone that starts working with scanning probe microscopes, and a useful reference book for those more advanced in the field. After an Overview chapter accessible for newcomers at an entry level presenting the basic design, scientific background, and illustrative applications, the book has three Parts. Part I, Principles, provides the most systematic and detailed theory of its scientific bases from basic quantum mechancis and condensed-metter physics in all available literature. Quantitative analysis of its imaging mechanism for atoms, molecules, and wavefunctions is detailed. Part II, Instrumentation, provides down to earth descriptions of its building components, including piezoelectric scanners, vibration isolation, electronics, software, probe tip preparation, etc. Part III, Related methods, presenting two of its most important siblings, scanning tunnelling specgroscopy and atomic force miscsoscopy. The book has five appendices for background topics, and 405 references for further readings.
Conference papers on the topic "Scanner in chemistry"
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Tu, Chao, Jun Liu, and Yinghui Hu. "Planar Near-field Scanner System Error Analysis." In 2015 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icmmcce-15.2015.155.
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Avouris, Phaedon, and In-Whan Lyo. "Probing and Inducing Surface Chemistry on the Atomic Scale Using the STM." In Scanned probe microscopy. AIP, 1991. http://dx.doi.org/10.1063/1.41422.
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Baumont, Genevieve, Tanja Perko, Grażyna Zakrzewska, Metka Kralj, Daniela Diaconu, and Nadja Železnik. "Review of the Content Analysis of Physics School Books Coming From Different European Countries on Radioactivity and Nuclear Energy." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66020.
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The EAGLE project was a Euratom FP7 which helped to identify and disseminate good practices in information and communication processes related to ionizing radiation. For this purpose, the consortium reviewed national and international data, tools and methods as well as institutional work in order to identify education, information and communication needs. Generally in high school the first concepts on radioactivity and ionizing radiation (IR) are introduced mainly in the subjects of physics or physical chemistry. There are a number of concepts in relation with IR and nuclear topics, and different ways to teach them: theoretical, mathematical, historical or practical. The question also rose, to what extend the various topics related to ionizing radiation (health, environment, history) are dealt with. As already mentioned, all these questions let to the idea to compare the content dealing with radioactivity and nuclear topics in different physics school books and more specifically schoolbooks for high school students (in the age 17 to 18). The method was as follows: - For the review the different partners of EAGLE have sent the schoolbooks used for the target group, or scanned documents. - Spanish schoolbooks and English schoolbooks were purchased to extend the review to other EU countries. - IRSN works in partnership with a high school based in the French town Vichy. - Each book was analyzed in detail to list with precision the content. A matrix helped to compare them. The paper presents the comparison of the contents of these books and their analysis. Some recommendations coming from the Eagle project will be discussed.