Bibliografie tematiche / Digital pH control

Letteratura scientifica selezionata sul tema "Digital pH control"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Indice

Articoli di riviste
Tesi
Capitoli di libri
Atti di convegni

Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Digital pH control".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Articoli di riviste sul tema "Digital pH control"

Hong, Zhang, Shou Sheng Zhang e Lu Ping Sang. "Research on Application of Distributed Control System in Industrial Process Control". Applied Mechanics and Materials 427-429 (settembre 2013): 842–45. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.842.

Testo completo

Abstract (sommario):

By combination with the general structure characteristics of the distributed control system and the technical specifications of CAN bus, this paper puts forward, designs a FDCS model control system for sewage treatment based on CAN bus and establishes mathematic model for dissolved oxygen (DO) and pH value in the oxidation ditch. It also designs two self-adaptive algorithms of the model and performs digital simulation of the control algorithms.

Gli stili APA, Harvard, Vancouver, ISO e altri

Angerri Feu, O., F. Rousaud, S. Gràcia, E. Emiliani, A. Kanashiro, F. M. Sánchez-Martín, F. Millán, J. Palou e J. Cuñé. "Entering to 2.0 cystinuric management: Medical digital solution to monitor and control urinary pH". European Urology Supplements 18, n. 7 (ottobre 2019): e2916. http://dx.doi.org/10.1016/s1569-9056(19)33084-2.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Angerri*, Oriol, Ferran Rousaud, Silvia Gràcia, Esteban Emiliani, Andres K. Kanashiro, Francisco Sánchez-Martín, Félix Millán, Joan Palou e Jordi Cuñé. "MP43-04 MEDICAL DIGITAL SOLUTION TO MONITOR AND CONTROL URINARY PH IN CYSTINURIC PATIENTS". Journal of Urology 203 (aprile 2020): e648. http://dx.doi.org/10.1097/ju.0000000000000898.04.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Juliarni, Yossy, e Gunawan Gunawan2. "PENGARUH MENYIKAT GIGI DENGAN SIWAK (Salvadora persica) TERHADAP pH SALIVA". Andalas Dental Journal 4, n. 1 (14 giugno 2016): 45–54. http://dx.doi.org/10.25077/adj.v4i1.48.

Testo completo

Abstract (sommario):

Background: Salivary pH is one of factor which involved in caries development. Decreasing of salivary pH will cause enamel demineralization. Miswak (Salvadora persica) as a toothbrush because it has mechanical and chemical effects such as essential oil and bicarbonate which can stimulate salivary secretion. Thus, it will increase the buffer capacity and salivary pH lead to enamel remineralization. Objective: This study aimed to know the effect of toothbrushing with miswak (Salvadora persica) on salivary pH. Methods: The clinical experiment study with pre-test and post-test control group design. The sample of this study is the students of Faculty of Dentistry, Andalas University, Padang. There are 34 students that divided into two groups randomly that is case and control group. Case group used miswak while control group used conventional toothbrush, respectively brushing horizontally for 2 minutes. Salivary pH was measured using digital pH meter in scale of 0.0 to 14.0 with 0.1 sensitivity from pen type pH meter. The data analyzed by Shapiro-Wilk test continued by paired t-test and Mann-Whitney test. Results: paired t-test produced significant value p=0,001 in case group and p=0,000 in control group. Mann-Whitney test produced significant value p=0.317. There was no significant difference in statistic among these groups. Conclusion: Toothbrushing with miswak has effect on salivary pH. Miswak as effective as toothbrush on salivary pH Keywords:Toothbrushing, miswak (Salvadora persica), Salivar

Gli stili APA, Harvard, Vancouver, ISO e altri

Alawiyah, Fadlun, Shanty Chairani e Danica Anastasia. "Gargling Effect of Zamzam Water on Salivary pH". Insisiva Dental Journal: Majalah Kedokteran Gigi Insisiva 10, n. 1 (31 maggio 2021): 7–11. http://dx.doi.org/10.18196/di.v10i1.10178.

Testo completo

Abstract (sommario):

Caries is a multifactorial infection disease that happened during the decrease of salivary pH caused by acids from bacterial metabolism. Bicarbonate is an important buffer component in saliva that can help neutralize salivary pH. Zamzam water has high bicarbonate content. This study aimed to evaluate the effect of gargled with Zamzam water on salivary pH. This experimental research was done with pre-test and post-test control group design involving 40 dentistry students at the University of Sriwijaya aged 18-23 years old, with DMF-T score ≤3. Samples were divided into 2 groups, the Zamzam water group, and thedistilled water group. Samples gargled their mouth with 10 ml of a 25% sucrose solution for one minute, then saliva was collected with spitting method and salivary pH was measured with digital pH meter and recorded as initial pH. Samples then gargledwith 20 ml of Zamzam water or distilled water according to each group for one minute, then saliva was collected in the same way as before, and pH was measured and recorded as final pH. Data were analyzed with paired t-test and Mann-Whitney. The result showed that salivary pH increased significantly after gargled with Zamzam water (p0,05). The mean difference of salivary pH aftergargled with Zamzam water was statistically higher than distilled water (p0,05). In conclusion, Gargled with Zamzam water can increase salivary pH.

Gli stili APA, Harvard, Vancouver, ISO e altri

Bajunaid, Salwa O., Bashayer H. Baras, Abdulrahman A. Balhaddad, Michael D. Weir e Hockin H. K. Xu. "Antibiofilm and Protein-Repellent Polymethylmethacrylate Denture Base Acrylic Resin for Treatment of Denture Stomatitis". Materials 14, n. 5 (25 febbraio 2021): 1067. http://dx.doi.org/10.3390/ma14051067.

Testo completo

Abstract (sommario):

Candida albicans (C. albicans) biofilm is a common etiological factor in denture stomatitis. The purpose of this study was to investigate the effects of incorporating 2-methacryloyloxyethyl phosphorylcholine (MPC) as a protein repellent into a new high-impact denture acrylic (HIPA) resin on the surface roughness, solution pH, and C. albicans biofilm adhesion to the denture base. The new acrylic denture resin base was formulated by mixing MPC into HIPA resin at mass fractions of 1.5%, 3%, and 4.5%. Surface roughness was measured using a Mitutoyo surface roughness tester. C. albicans biofilm growth and viability were assessed via colony forming unit counts. The pH of the biofilm growth medium was measured using a digital pH meter. Adding MPC to the HIPA resin at percentages of 1.5% and 3% increased the roughness values significantly (p < 0.05), while adding 4.5% MPC resulted in no difference in roughness values to that of the control group (p > 0.05). All experimental groups demonstrated neutral pH values (pH ≅ 7) and were not significantly different from each other (p > 0.05). Incorporating 2-methacryloyloxyethyl phosphorylcholine at 4.5% resulted in a significant (≅1 log) colony-forming unit reduction compared with the control group with 0% MPC (p < 0.05). A fungal-retarding denture acrylic resin was developed through the incorporation of MPC for its protein-repelling properties. This newly developed denture acrylic material has the potential to prevent oral microbial infections, such as denture stomatitis.

Gli stili APA, Harvard, Vancouver, ISO e altri

Hadi, Awal M., Koen T. B. Mouchaers, Ingrid Schalij, Katrien Grunberg, Gerrit A. Meijer, Anton Vonk-Noordegraaf, Willem J. van der Laarse e Jeroen A. M. Beliën. "Rapid Quantification of Myocardial Fibrosis: A New Macro-Based Automated Analysis". Analytical Cellular Pathology 33, n. 5-6 (2010): 257–69. http://dx.doi.org/10.1155/2010/858356.

Testo completo

Abstract (sommario):

Background: Fibrosis is associated with various cardiac pathologies and dysfunction. Current quantification methods are time-consuming and laborious. We describe a semi-automated quantification technique for myocardial fibrosis and validated this using traditional methods.Methods: Pulmonary Hypertension (PH) was induced in adult Wistar rats by subcutaneous monocrotaline (MCT) injection (40 mg/kg). Cryosections of myocardial tissue (5 μm) of PH rats (n=9) and controls (n=9) were stained using Picrosirius red and scanned with a digital microscopic Mirax slide scanner. From these sections 21 images were taken randomly of each heart. Using ImageJ software a macro for automated image analysis of the amount of fibrosis was developed. For comparison, fibrosis was quantified using traditional polarisation microscopy. Both methods were correlated and validated against stereology as the gold standard. Furthermore, the method was tested in paraffin-embedded human tissues.Results: Automated analysis showed a significant increase of fibrosis in PH hearts vs. control. Automated analysis correlated with traditional polarisation and stereology analysis (r2=0.92 and r2=0.95, respectively). In human heart, lungs, kidney and liver, a similar correlation with stereology (r2=0.91) was observed. Time required for automated analysis was 22 and 33% of the time needed for stereology and polarisation analysis, respectively.Conclusion: Automated quantification of fibrosis is feasible, objective and time-efficient.

Gli stili APA, Harvard, Vancouver, ISO e altri

Cardoso, Felipe Cardoso de, Vanessa Sinnott Esteves, Simone Tostes de Oliveira, Camila Serina Lasta, Stella Faria Valle, Rómulo Campos e Félix Hilario Diaz González. "Hematological, biochemical and ruminant parameters for diagnosis of left displacement of the abomasum in dairy cows from Southern Brazil". Pesquisa Agropecuária Brasileira 43, n. 1 (gennaio 2008): 141–47. http://dx.doi.org/10.1590/s0100-204x2008000100018.

Testo completo

Abstract (sommario):

The objective of this work was to evaluate hematological, biochemical and ruminant parameters for diagnosis and treatment of the left displaced abomasum (LDA) in dairy cows, in the Plateau Region of Rio Grande do Sul, Brazil. Ruminant fluid, blood and urine samples were collected from 20 cows suffering LDA and from 20 healthy cows (control). The cows with LDA showed lower values of daily milk production, body weight and corporal condition score. The use of pH reagent strips showed to be functional in the field, when compared to a digital pH meter. Ruminant dynamics was damaged in cows affected by LDA, as it was evidenced by the higher reduction time of methylene blue. Serum values of lactate, beta-hydroxybutyrate, urea, albumin, free fatty acids and cholesterol shows to be auxiliary tools in the LDA characterization.

Gli stili APA, Harvard, Vancouver, ISO e altri

Baad, Rajendra, Deepak Jain, Debapriya Pradhan, Amit Gulati, Swapnil J. Kolhe e B. Sunil Rao. "Effect of the Presence of Dental Plaque on Oral Sugar Clearance and Salivary pH: An in vivo Study". Journal of Contemporary Dental Practice 13, n. 6 (2012): 753–55. http://dx.doi.org/10.5005/jp-journals-10024-1223.

Testo completo

Abstract (sommario):

ABSTRACT Background Fermentable carbohydrates and microorganisms in the plaque play a significant role in the pathogenesis of dental caries. Oral clearance of sugars and salivary pH is affected by the presence of plaque. Aims and objectives This study was conducted to study the effect of the presence of plaque on the salivary clearance of sucrose and on salivary pH. Materials and methods The study design was of a randomized controlled parallel group clinical trial and included two groups: The control group and plaque group, as follows: Control group— subjects without plaque and plaque group—subjects with plaque. Salivary sucrose determination was done by using the anthrone technique. A digital pH meter estimated the salivary pH. The Student's t test and Mann-Whitney test was employed to compare the intergroup differences. Pearson's correlation coefficient was used for analysis. Results The salivary sucrose clearance time was increased by presence of plaque. Conclusion The presence of plaque led to increased salivary sucrose concentrations and increased the salivary sucrose clearance time. Clinical significance The dental caries is the dynamic relationship among the dental plaque microbiota, dietary carbohydrates, saliva and cariogenic potential of the dental plaque. Caries occur preferentially in the dentition sites characterized by high exposure to carbohydrate and diminished salivary effect. How to cite this article Pradhan D, Jain D, Gulati A, Kolhe SJ, Baad R, Rao BS. Effect of the Presence of Dental Plaque on Oral Sugar Clearance and Salivary pH: An in vivo Study. J Contemp Dent Pract 2012;13(6):753-755.

Gli stili APA, Harvard, Vancouver, ISO e altri

Dantas, Raquel Venâncio Fernandes, Marcus Cristian Muniz Conde, Hugo Ramalho Sarmento, Cesar Henrique Zanchi, Sandra Beatriz Chaves Tarquinio, Fabrício Aulo Ogliari e Flávio Fernando Demarco. "Novel experimental cements for use on the dentin-pulp complex". Brazilian Dental Journal 23, n. 4 (2012): 344–50. http://dx.doi.org/10.1590/s0103-64402012000400006.

Testo completo

Abstract (sommario):

This aim of this study was to evaluate the physicochemical and biological properties of novel experimental cements (Hybrid, Paste and Resin) based on synergistic combinations of existing materials, including pH, diametral tensile strength (DTS) and cytotoxicity comparing them with mineral trioxide aggregate (MTA - Angelus®) and a glass ionomer cement (GIC) developed at our laboratory. For the physicochemical and biological tests, specimens with standard dimensions were produced. pH measurements were performed with digital pH meter at the following time intervals: 3, 24, 48 and 72 h. For the DTS test, cylindrical specimens were subjected to compressive load until fracture. The MTT assay was performed for cytotoxicity evaluation. Data were analyzed by ANOVA and Tukey's test (α=0.05). Paste group showed pH values similar to MTA, and Hybrid group presented pH values similar to GIC (p>0.05). The tested materials showed pH values ranging from alkaline to near neutrality at the evaluated times. MTA and GIC showed similar DTS values. The lowest and highest DTS values were seen in the Paste and Resin groups, respectively (p<0.05). Cell viability for MTA and experimental Hybrid, Paste and Resin groups was 49%, 93%, 90% and 86%, respectively, when compared with the control group. The photo-cured experimental resin cement showed similar or superior performance compared with the current commercial or other tested experimental materials.

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Tesi sul tema "Digital pH control"

Leksawasdi, Noppol Biotechnology &amp Biomolecular Sciences (BABS) UNSW. "Kinetics and modelling of enzymatic process for R-phenylacetylcarbinol (PAC) production". Awarded by:University of New South Wales. Biotechnology and Biomolecular Sciences (BABS), 2004. http://handle.unsw.edu.au/1959.4/20846.

Testo completo

Abstract (sommario):

R-phenylacetylcarbinol (PAC) is used as a precursor for production of ephedrine and pseudoephedrine, which are anti-asthmatics and nasal decongestants. PAC is produced from benzaldehyde and pyruvate mediated by pyruvate decarboxylase (PDC). A strain of Rhizopus javanicus was evaluated for its production of PDC. The morphology of R. javanicus was influenced by the degree of aeration/agitation. A relatively high specific PDC activity (328 U decarboxylase g-1 mycelium) was achieved when aeration/agitation were reduced significantly in the latter stages of cultivation. The stability of partially purified PDC and crude extract from R. javanicus were evaluated by examining the enzyme deactivation kinetic in various conditions. R. javanicus PDC was less stable than Candida utilis PDC currently used in our group. A kinetic model for the deactivation of partially purified PDC extracted from C. utilis by benzaldehyde (0?00 mM) in 2.5 M MOPS buffer has been developed. An initial lag period prior to deactivation was found to occur, with first order dependencies of PDC deactivation on exposure time and on benzaldehyde concentration. A mathematical model for the enzymatic biotransformation of PAC and its associated by-products has been developed using a schematic method devised by King and Altman (1956) for deriving the rate equations. The rate equations for substrates, product and by-products have been derived from the patterns for yeast PDC and combined with a deactivation model for PDC from C. utilis. Initial rate and biotransformation studies were applied to refine and validate a mathematical model for PAC production. The rate of PAC formation was directly proportional to the enzyme activity level up to 5.0 U carboligase ml-1. Michaelis-Menten kinetics were determined for the effect of pyruvate concentration on the reaction rate. The effect of benzaldehyde on the rate of PAC production followed the sigmoidal shape of the Monod-Wyman-Changeux (MWC) model. The biotransformation model, which also included a term for PDC inactivation by benzaldehyde, was used to determine the overall rate constants for the formation of PAC, acetaldehyde and acetoin. Implementation of digital pH control for PAC production in a well-stirred organic-aqueous two-phase biotransformation system with 20 mM MOPS and 2.5 M dipropylene glycol (DPG) in aqueous phase resulted in similar level of PAC production [1.01 M (151 g l-1) in an organic phase and 115 mM (17.2 g l-1) in an aqueous phase after 47 h] to the system with a more expensive 2.5 M MOPS buffer.

Gli stili APA, Harvard, Vancouver, ISO e altri

Capitoli di libri sul tema "Digital pH control"

White, Robert E. "Site Selection and Soil Preparation". In Soils for Fine Wines. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195141023.003.0010.

Testo completo

Abstract (sommario):

At the Pine Ridge winery in Napa Valley, California, a sign lists six essential steps in wine production. The first step reads . . . Determine the site—prepare the land, terrace the slopes for erosion control, provide drainage and manage soil biodiversity. . . . Determining the site means gathering comprehensive data on the local climate, topography, and geology, as well as the main soil types and their distribution. Traditionally, site determination was done using the knowledge and experience of individuals. Now it is possible to combine an expert’s knowledge with digital data on climate, parent material, topography, and soils in a GIS format to assess the biophysical suitability of land for wine grapes. Viticultural and soil experts together identify the key properties and assign weightings to these properties. An example of an Analytical Hierarchy Process is shown in figure 8.1. In this approach, both objective and subjective data were pooled and evaluated to decide the suitability of land for viticulture in West Gippsland, Victoria. In this region with a relatively uniform, mild climate, soil was given a 70% weighting, and the important soil properties were identified as depth, drainage, sodicity, texture, and pH. But in other areas, with another group of experts, a different set of key properties and weightings may well be identified. For example, a similar approach used in Virginia, in the United States, gave only a 25% weighting to soil and 30% to elevation (which affected temperature, a critical factor governing growth rate and ripening) (Boyer and Wolf 2000). This kind of approach can be refined to indicate site suitability for a particular variety within a region of given macroclimate. For example, Barbeau et al. (1998) assessed the suitability of sites in the Loire Valley, France, for the cultivar Cabernet Franc, using an index of “precocity.” Such an index is related to the ability of the fruit to accumulate sugar and anthocyanins and to attain a favorable acidity.

Gli stili APA, Harvard, Vancouver, ISO e altri

Atti di convegni sul tema "Digital pH control"

Pawar, Smita, Shreya Tembe e Sahar Khan. "Design of an Affordable pH module for IoT Based pH Level Control in Hydroponics Applications". In 2020 International Conference on Convergence to Digital World - Quo Vadis (ICCDW). IEEE, 2020. http://dx.doi.org/10.1109/iccdw45521.2020.9318677.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Fuangthong, Mathawee, e Part Pramokchon. "Automatic control of electrical conductivity and PH using fuzzy logic for hydroponics system". In 2018 International Conference on Digital Arts, Media and Technology (ICDAMT). IEEE, 2018. http://dx.doi.org/10.1109/icdamt.2018.8376497.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Olson, Vickie G. "Reducing Cooling Tower Fill Fouling and Degradation With Water Quality Control". In ASME 2007 Power Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/power2007-22052.

Testo completo

Abstract (sommario):

Cooling tower fill may be composed of wood or plastic, but it must provide adequate surface area for heat dissipation. Online and field water quality analysis can maximize tower efficiency and minimize maintenance. Uncontrolled levels of pH, bio-growth, or over-application of chemicals cause degradation of the material and plugging. Automatic control of pH conditioner can be accomplished with proven differential pH methods tied to analog and/or digital control. Oxidizing biocide application can be optimized with ORP and halogen analysis and control. Overuse of this type of biocide can also cause wood delignification that can affect the structural integrity of the tower. Another cause of fouling is excessive solids accumulation. Solids buildup can be minimized with side-stream filtration and/or clarification and monitored with low maintenance self-cleaning optical probes.

Gli stili APA, Harvard, Vancouver, ISO e altri

Liu, Ming, Tatsuo Nakagawa e Kenichi Osada. "Fully digital voltage-mode control based on predictive hysteresis method (FDVC-PH) for DC-DC converters". In 2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012. IEEE, 2012. http://dx.doi.org/10.1109/iscas.2012.6272060.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Tomassini, Juan, Alejandro Donaire e Sergio Junco. "Energy- and flatness-based control of DC-DC converters with nonlinear load". In The 11th International Conference on Integrated Modeling and Analysis in Applied Control and Automation. CAL-TEK srl, 2018. http://dx.doi.org/10.46354/i3m.2018.imaaca.005.

Testo completo

Abstract (sommario):

"This paper presents a passivity-based controller design (PBC) aimed at stabilizing DC-DC power electronic converters with nonlinear dissipative loads. The converters considered in this work are the buck, the boost and the buck-boost. First, Bond Graph technique is used to obtain the flat output of each converter model. The controller is designed within the port-Hamiltonian (pH) framework, ensuring stability and other desired closed-loop properties. To this aim a desired closedloop dynamics in pH form with a quadratic storage function and a flat-output-inspired change of variables are proposed, which are common to the three converters. The controllers that render the closed-loop dynamics in the desired pH form are obtained via model matching. This design has two major advantages. The first is that the so-called matching equation can be solved by construction; thus, the cumbersome task of solving partial differential equations is avoided. The second advantage is that in all the converters treated the closed-loop dynamics is linear; thus, the performance of the control system can be easily determined via the tuning of the eigenvalues of the closed-loop evolution matrix. The performance is assessed through digital simulation."

Gli stili APA, Harvard, Vancouver, ISO e altri

ALASCO, Ricardo, Eden Alyzza DOMDOMA, Karl Angelo DORIA, Kathleen Mae RICAFRANCA, Yashmine Erika SAITO, Nilo ARAGO, Ryan REYES e Edgar Galido. "SoilMATTic: Arduino-Based Automated Soil Nutrient and pH Level Analyzer using Digital Image Processing and Artificial Neural Network". In 2018 IEEE 10th International Conference on Humanoid, Nanotechnology, Information Technology,Communication and Control, Environment and Management (HNICEM). IEEE, 2018. http://dx.doi.org/10.1109/hnicem.2018.8666264.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Moroz, Leonid, Maksym Burlaka, Tishun Zhang e Olga Altukhova. "Application of Digital Twin Concept for Supercritical CO2 Off-Design Performance and Operation Analyses". In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15743.

Testo completo

Abstract (sommario):

Abstract To date variety of supercritical CO2 cycles were proposed by numerous authors. Multiple small-scale tests performed, and a lot of supercritical CO cycle aspects studied. Currently, 3-10 MW-scale test facilities are being built. However, there are still several pieces of SCO2 technology with the Technology Readiness Level (TRL) 3-5 and system modeling is one of them. The system modeling approach shall be sufficiently accurate and flexible, to be able to precisely predict the off-design and part-load operation of the cycle at both supercritical and condensing modes with diverse control strategies. System modeling itself implies the utilization of component models which are often idealized and may not provide a sufficient level of fidelity. Especially for prediction of off-design and part load supercritical CO2 cycle performance with near-critical compressor and transition to condensing modes with lower ambient temperatures, and other aspects of cycle operation under alternating grid demands and ambient conditions. In this study, the concept of a digital twin to predict off-design supercritical CO2 cycle performance is utilized. In particular, with the intent to have sufficient cycle simulation accuracy and flexibility the cycle simulation system with physics-based methods/modules were created for the bottoming 15.5 MW Power Generation Unit (PGU). The heat source for PGU is GE LM6000-PH DLE gas turbine. The PGU is a composite (merged) supercritical CO2 cycle with a high heat recovery rate, its design and the overall scheme are described in detail. The calculation methods utilized at cycle level and components’ level, including loss models with an indication of prediction accuracy, are described. The flowchart of the process of off-design performance estimation and data transfer between the modules as well. The comparison of the results obtained utilizing PGU digital twin with other simplified approaches is performed. The results of the developed digital twin utilization to optimize cycle control strategies and parameters to improve off-design cycle performance are discussed in detail.

Gli stili APA, Harvard, Vancouver, ISO e altri

Andrade, Luan Alberto, Cleiton Antônio Nunes e Joelma Pereira. "CARACTERÍSTICAS QUÍMICAS DA GOMA XANTANA COMERCIAL". In I Congresso Brasileiro de Biotecnologia On-line. Revista Multidisciplinar de Educação e Meio Ambiente, 2021. http://dx.doi.org/10.51189/rema/792.

Testo completo

Abstract (sommario):

Introdução: A goma xantana é um polissacarídeo sintetizado por uma bactéria fitopatogênica do gênero Xanthomonas e tem extrema importância comercial. É um produto utilizado na área de alimentos como aditivo e classificado como agente emulsificante, espessante e estabilizante Objetivo: Conhecer algumas características químicas da goma xantana comercial. Material e métodos: Para leitura do potencial hidrogeniônico utilizou-se um potenciômetro digital. Inicialmente preparou-se uma suspensão da goma em 100 mL de água destilada, com agitação por 10 minutos e, assim, realizou-se a leitura do pH. Posteriormente, a mesma suspensão utilizada anteriormente, foi agitada, enquanto se adicionou uma solução de NaOH 0,1 mol L-1 até atingir pH próximo a 8 para calcular o teor de acidez, expresso em miliequivalente de NaOH por 100 g da matéria integral. Os açúcares foram determinados pelo método redutométrico. Utilizou-se um espectrofotômetro para leitura das absorbâncias com comprimento de onda igual a 510 nm. Todas as análises foram realizadas com três repetições. Resultados: O pH e a quantidade de acidez titulável foi de 6,21 e 5,45 respectivamente. Conhecer o pH é de fundamental importância para os alimentos/aditivos, pois pode ser utilizado como medida de controle de qualidade. Produtos mais ácidos são naturalmente mais estáveis quanto à deterioração, pois bactérias preferem pH mais alto para se proliferarem. Os teores de açúcares redutores, não redutores e totais foram de 0,09%, 0,12% e 0,21% respectivamente. Os baixos valores encontrados na quantificação de açúcares na goma xantana sinalizam que os carboidratos presentes em solução estão, principalmente, na forma de polissacarídeos, como consta na literatura. Conclusão: A goma xantana, um produto obtido da biotecnologia, forma solução levemente ácida, possui ácidos orgânicos devido ao teor de acidez titulável e contém baixos teores de açúcares simples, sendo formada por carboidratos complexos.

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!