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Academic literature on the topic 'Pvt'

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Published: 4 June 2021
Last updated: 21 February 2023

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Journal articles on the topic "Pvt"

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Giannitrapani, Lydia, Walter Granà, Anna Licata, Cosima Schiavone, Giuseppe Montalto, and Maurizio Soresi. "Nontumorous Portal Vein Thrombosis in Liver Cirrhosis: Possible Role of β-Blockers." Medical Principles and Practice 27, no. 5 (2018): 466–71. http://dx.doi.org/10.1159/000492893.

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Objective: Nonselective β-blockers (NSBB) are used in liver cirrhosis (LC) to prevent variceal bleeding because they decrease portal pressure. A main risk factor for the development of portal vein thrombosis (PVT) in LC is decreased portal vein inflow velocity. The aim of our study was to examine retrospectively the incidence of PVT and its correlation with the use of β-blockers in a cohort of LC patients. Subjects and Methods: Data from 230 LC patients (90% Child-Pugh class A), who had been followed up for at least 5 years, were reviewed. The diagnosis of PVT was made by ultrasound. The presence of PVT was evaluated with multiple logistic regression analysis where the independent variables were those significant in the univariate analysis. Results: The prevalence of PVT at baseline was 4.5%, and the incidence was 4.3% at 5 years; among the subjects taking β blockers, 46.4% were taking NSBB. A total of 19 PVT cases were found. Grade of esophageal varices (p < 0.01), PLT (p < 0.003), INR (p < 0.03), spleen diameter (p < 0.001) and PLT/spleen ratio (p < 0.0005) were significantly associated with PVT. The use of NSBB indicated a higher risk of PVT compared to selective β-blockers (SBB) (p < 0.05). In logistic regression analysis only the grade of esophageal varices was significant (p < 0.02). Univariate analysis of patients taking β-blockers showed an association of PVT with grade of esophageal varices (p < 0.01), CP class (p < 0.02), AST (p < 0.03), ALT and albumin (p < 0.02), PLT count and PLT/LD (p < 0.03), longitudinal diameter of the spleen (p < 0.005), ascites (p < 0.05), portal vein (p < 0.0001) and NSBB (OR 8.1; 95% CI 1.7–38.8). Conclusion: NSBB seem to play a role in PV thrombogenesis. Further studies are needed, especially in decompensated LC patients.
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Freytag, Rotraud, José Antonio Pérez Gil, and Reinhard Forstner. "pvT-Behavior of Polymers under Processing Conditions and Implementation in the Process Simulation." Materials Science Forum 825-826 (July 2015): 677–84. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.677.

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The development of high performance products at lowest possible product development-time and costs is the demand of the plastics industry today. A successful use of process simulation to describe the behavior of complex structures and to minimize the technical and economic risks for companies requires application and process-relevant material data.The pvT-behavior of polymers is an essential parameter for process simulations. Especially the dependence of the specific volume of pressure and temperature [1, 2] under process conditions is not mapped to the existing measurement methods.In this study pvT measurements were performed on selected amorphous and semi-crystalline polymers (PP, HDPE, POM, PBT, and ABS) with a Pirouette pvT device, a combination of a dilatometer and Couette rheometer. The specific volume was determined as a function of temperature (25-300°C) and at pressures ranging between 200-1000 bar. On top of that, the influence of the cooling rate was also investigated by pvT measurements performed at cooling rates of 0.1°C/s, 1°C/s and 100°C/s.The coefficients for the 2nd domain Tait pvT-model, which is implemented in the software Autodesk Moldflow, were determined by fitting the experimental pvT data and comparing them with the measured curves. As a result, the semi-crystalline polymers show a shift of the transition temperature to lower temperatures and a reduction in the specific volume in the melt is observed. For validation, in a case study shrinkage results in real were compared with the simulation.
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Chen, Xianmin, and Niraj K. Jha. "gem5-PVT." ACM Journal on Emerging Technologies in Computing Systems 12, no. 3 (September 21, 2015): 1–19. http://dx.doi.org/10.1145/2755564.

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4

Fudholi, Ahmad, and Kamaruzzaman Sopian. "R&D of Photovoltaic Thermal (PVT) Systems: an Overview." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 2 (June 1, 2018): 803. http://dx.doi.org/10.11591/ijpeds.v9.i2.pp803-810.

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<span>Photovoltaic thermal (PVT), which is the popular technology for harvesting solar energy, receive solar energy and convert it into electrical and thermal energy simultaneously. In this review, design, heat transfer, energy modelling and performance analysis of PVT systems are presented. Four types of PVT systems base on heat transfer medium; air-based PVT system, water-based PVT system, the combination of water/air-based PVT system, and nanofluid-based PVT system are presented. In addition, major finding on energy and exergy analysis of PVT systems are summarized. </span>
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Mikuła, Tomasz, Joanna Kozłowska, Wojciech Stańczak, Mariusz Sapuła, Aleksandra Różyk, and Alicja Wiercińska-Drapało. "Serum ADAMTS-13 Levels as an Indicator of Portal Vein Thrombosis." Gastroenterology Research and Practice 2018 (2018): 1–4. http://dx.doi.org/10.1155/2018/3287491.

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Background. Coagulation disorders in patients with liver cirrhosis are a common clinical problem. Cirrhosis should be considered a state of impaired blood clotting or an imbalance of the whole coagulation system. Cirrhosis-induced coagulopathy encompasses disturbances in both the procoagulant and anticoagulant systems. This mechanism may promote the development of thrombosis with portal vein thrombosis (PVT), which is considered an obstacle to orthotopic liver transplantation (OLT). We assessed serum ADAMTS-13 levels in patients with decompensated liver cirrhosis, with and without PVT. Material and Methods. Serum ADAMTS-13 levels, age, platelet count (PLT), and INR (international normalized ratio) were evaluated in (n=64) patients with liver cirrhosis either with PVT (group 1, n=31) or without PVT (group 2, n=33). The results were compared with those from healthy volunteers (group 3, n=37). Liver cirrhosis was based on Desmet’s classification of chronic hepatitis in liver biopsy stage ≥ 3 or liver elastography F-score ≥ 3. Serum ADAMTS-13 levels were measured with Quantikine® ELISA Human ADAMTS13 Immunoassay, R&D Systems Inc. We used Welch’s F-test, Games-Howell, one-way ANOVA, Bonferroni test, and logistic regression to determine whether ADAMTS-13 levels were a predictor that was independent of MELD and Child-Pugh scores. All results (P<0.05) were considered statistically significant. Results. The mean serum ADAMTS-13 level in patients with PVT was significantly lower than that in patients without PVT (P=0.001) and controls (P=0.001). The mean serum ADAMTS-13 level in patients without PVT was significantly lower than that in controls (P=0.001). ADAMTS-13 levels were significantly associated with PVT accounting for the Child-Pugh or MELD score in the logistic regression model. Conclusions. Low serum ADAMTS-13 levels can be a useful indicator of portal thrombosis in patients with decompensated liver cirrhosis irrespective of Child-Pugh or MELD scores. Further research is needed to determine whether ADAMTS-13 levels will find use in everyday clinical practice.
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Gairing, Simon Johannes, Peter Robert Galle, Jörn M. Schattenberg, Karel Kostev, and Christian Labenz. "Portal Vein Thrombosis Is Associated with an Increased Incidence of Depression and Anxiety Disorders." Journal of Clinical Medicine 10, no. 23 (December 2, 2021): 5689. http://dx.doi.org/10.3390/jcm10235689.

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Portal vein thrombosis (PVT) is a severe disease that adversely affects patients’ well-being. Data on the influence of PVT on the occurrence of depression or anxiety disorders are lacking. This study aimed to explore the impact of PVT on the incidence of depression and anxiety disorders diagnoses in a large German primary care cohort over a ten-year period. Patients with PVT were matched to non-PVT individuals by age, sex, yearly consultation frequency, index year and comorbidities in a 1:5 ratio. The primary outcome of the study was the incidence of depression and anxiety disorders. The relationship between PVT and both depression and anxiety disorders was investigated using Cox regression models. We compared 547 patients with PVT with 2735 matched individuals without PVT. Within 5 years of the index date, 17.4% of patients with PVT and 9.3% of non-PVT individuals were diagnosed with depression (p < 0.001). Anxiety disorders were diagnosed in 5.5% and 3.0% of patients with PVT and non-PVT individuals, respectively (p = 0.002). On regression analyses, PVT was positively associated with incident depression (HR 2.01, 95% CI 1.53–2.64, p < 0.001) as well as anxiety disorders (HR 2.16, 95% CI 1.35–3.46, p = 0.001). Regarding depression, this association remained significant in women as well as in men. There was no association between PVT and the incidence of anxiety disorders in women. In conclusion, PVT is associated with the development of depression and anxiety disorders. However, further prospective studies are needed to confirm our findings before definitive recommendations can be made.
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Lu, Shenxin, Guohua Hu, Shiyao Chen, and Jian Wang. "Risk Factors of Portal Vein Thrombosis after Devascularization Treatment in Patients with Liver Cirrhosis: A Nested Case-Control Study." BioMed Research International 2020 (August 27, 2020): 1–11. http://dx.doi.org/10.1155/2020/9583706.

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Background and Aim. To investigate the incidence of portal vein thrombosis (PVT) after devascularization treatment and to explore the risk factors of perioperative PVT and PVT diagnosed during the follow-up period after surgery. Methods. We retrospectively reviewed medical records from cirrhosis patients who underwent devascularization for the treatment of portal hypertension in our hospital between January 1, 2008, and December 20, 2014. Patients were followed up to investigate the PVT incidence at different times after surgery. Patients were divided into two groups (PVT, no PVT), and the risk factors for PVT after surgery were determined. Results. Until October 16, 2015, the median follow-up time of the 124 patients enrolled into this study was 41.43 months (range, 5.47–95.30 months). 61 patients had perioperative PVT, and 21 (16.94%) patients had PVT diagnosed during the follow-up period. Those who had lower preoperative white blood cell counts, larger preoperative portal vein trunk diameter, and no gastric varices were more likely to have perioperative thrombosis. In those without perioperative PVT, a history of hypertension, higher grade of splenomegaly, and higher preoperative levels of creatinine were independent predictors of PVT occurrence during the follow-up period. Conclusions. The risk factors for perioperative PVT in cirrhotic patients after devascularization were lower preoperative white blood cell count and larger portal vein trunk diameter, with no gastric varices. A history of hypertension, a larger spleen, and higher preoperative creatinine level are independent predictors of PVT during follow-up after surgery in patients without perioperative PVT.
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Fudholi, Ahmad, Mariyam Fazleena Musthafa, Ivan Taslim, Merita Ayu Indrianti, Intan Noviantari Manyoe, and Mohd Yusof Othman. "Efficiency and energy modelling for PVT air collector with extended heat transfer area: a review." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4 (December 1, 2019): 2029. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp2029-2036.

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Solar energy is renewable and environment friendly and has been widely used in electricity generation and thermal energy through photovoltaic thermal (PVT) system. This system is beneficial in terms of maximum energy generation and cost of usage. The growing concern on energy sources and their usage has increased the significance and demand for PVT collectors. A PVT air collector consists of a PV panel and a thermal collector system. In PVT air collector, electricity and thermal energy are generated simultaneously. This review focuses on efficiency and energy modelling for PVT air collector with extended heat transfer area. Findings of this review indicated that PVT air collector with extended heat transfer area produced PVT efficiency higher than conventional PVT air collector. The thermal efficiency of PVT air collector for with and without extended heat transfer area are 21-83% and 12-70%, respectively, which the improvement of thermal efficiency is 15.7-42.8%.
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Danilă, Mirela, Ioan Sporea, Alina Popescu, and Roxana Șirli. "Portal vein thrombosis in liver cirrhosis – the added value of contrast enhanced ultrasonography." Medical Ultrasonography 18, no. 2 (June 1, 2016): 218. http://dx.doi.org/10.11152/mu.2013.2066.182.pvt.

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Portal vein thrombosis (PVT) is a frequent complication of liver cirrhosis and its prevalence increases with the severity of liver disease. Patients with liver cirrhosis and hepatocellular carcinoma may have either malignant or blunt (benign) PVT. In these patients, the diagnosis and characterization of PVT is important for the prognosis and further treatment.Ultrasound (US) is the modality of choice for the diagnosis of PVT. The features of PVT on B-mode (gray-scale) US include: dilatation of the portal vein, visualization of the thrombus and, in chronic PVT- cavernous transformation. Sensitivity of US in the diagnosis of PVT is improved by the use of Doppler US and of ultrasound contrast agents. In the latter years, contrast enhanced ultrasound (CEUS) showed high sensitivity in the differential diagnosis between benign and malignant PVT and could be the diagnostic method of choice for the characterization of PVT. Blunt thrombi are avascular and will not enhance during CEUS examination, while a hyperenhancement pattern of the portal thrombus in the arterial phase, with “wash out” in the portal or late phase is typical for malignant PVT.
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Burciu, Călin, Roxana Șirli, Felix Bende, Renata Fofiu, Alina Popescu, Ioan Sporea, Ana-Maria Ghiuchici, Bogdan Miuțescu, and Mirela Dănilă. "Usefulness of Imaging and Biological Tools for the Characterization of Portal Vein Thrombosis in Hepatocellular Carcinoma." Diagnostics 12, no. 5 (May 5, 2022): 1145. http://dx.doi.org/10.3390/diagnostics12051145.

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This study aims to evaluate the performance of contrast-enhanced ultrasound (CEUS) and biological tests to characterize portal vein thrombosis (PVT). We retrospectively analyzed 101 patients with PVT, liver cirrhosis, and hepatocellular carcinoma (HCC). In all patients, demographic, biologic, imaging, and endoscopic data were collected. All patients underwent CEUS and a second line imaging technique (CE-CT/MRI) to characterize PVT. Of the 101 cirrhotic subjects, 77 (76.2%) had HCC. CEUS had 98.6% sensitivity (Se) and 89.3% specificity (Sp) for the characterization of PVT type. A significant correlation was found between alpha-fetoprotein (AFP) levels and the PVT characterization at CEUS (r = 0.28, p = 0.0098) and CT/MRI (r = 0.3, p = 0.0057). Using the AFP rule-out cutoff values for HCC (AFP < 20 ng/dL), 78% of the subjects were correctly classified as having benign PVT, while 100% of the subjects were correctly classified as tumor-in-vein (TIV) when the rule-in cutoff value was used (AFP ≥ 200 ng/dL). Using multiple regression analysis, we obtained a score for classifying PVT. The PVT score performed better than CEUS (AUC—0.99 vs. AUC—0.93, p = 0.025) or AFP serum levels (AUC—0.99 vs. AUC—0.96, p = 0.047) for characterizing PVT. In conclusion, CEUS is a sensitive method for the characterization of PVT. The PVT score had the highest performance for PVT characterization.
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Dissertations / Theses on the topic "Pvt"

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Guo, Guodong. "Oscillators with Constant Frequency over PVT." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102392.

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This thesis is offered by Texas Instruments, Germany, aimed at designing an on-chip oscillator with constant frequency over process, voltage and temperature variation. RC relaxation oscillator is chosen to be the solution due to its small area and proper frequency accuracy. Two relaxation oscillators are implemented in the 70nm CMOS technology for comparison. One is the conventional double-grounded-capacitor oscillator, and the other one is the oscillator with voltage averaging feedback (VAF), which is a novel concept for relaxation oscillator design. The conventional oscillator is implemented step by step. The reference generation circuit is simplified with a voltage divider and a voltage-to-current converter; the enhanced output-impedance current mirror is chosen to ensure a high accuracy and high output impedance; the structure of the op amp and the comparators is chosen for low voltage design. Finally, a trimming scheme that is able to compensate a very large process variation with a high resolution is designed. After the schematic design of the whole circuit is done, the layout is finished as well. The simulation result shows that the designed conventional oscillator can achieve a frequency of 10MHz ±1.155% over PVT with a RMS period jitter of 149.7ps. The oscillator with VAF is superior to the conventional oscillator in that the VAF makes the oscillation frequency independent of the variation of comparator’s delay, which is the dominant contributor of frequency variation in conventional oscillator. Another merit of the oscillator with VAF is that the phase noise at low-offset frequency is suppressed by the VAF. Therefore, the oscillator with VAF can achieve better frequency accuracy and lower jitter than the conventional counterpart. In the actual implementation, the rail-to-rail op amp combining the op amps with both NMOS and PMOS input differential pair is adopted; the smaller resistor and capacitor for the integrator is chosen for a faster startup time; the similar trimming scheme to the conventional oscillator is applied on the capacitor and the reference coefficient. The simulation result confirms that oscillator with VAF has better performance on both frequency accuracy and jitter, which is 10MHz ±0.85% over PVT, with the RMS period jitter of 98.45ps. Finally, an example of possible application with the constant-frequency oscillator is demonstrated, which is to measure the frequency of a much higher clock signal. The clock frequency can be expressed by the product of the 8-bit counter’s final value and 10MHz. The accuracy of the measurement is dependent on the accuracy of the oscillator over PVT variation.
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Abd, Alrahman Chadi. "Evaluation of a PVT Air Collector." Thesis, Högskolan Dalarna, Elektroteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:du-19831.

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Hybrid Photovoltaic Thermal (PVT) collectors are an emerging technology that combines PV and solar thermal systems in a single solar collector producing heat and electricity simultaneously. The focus of this thesis work is to evaluate the performance of unglazed open loop PVT air system integrated on a garage roof in Borlänge. As it is thought to have a significant potential for preheating ventilation of the building and improving the PV modules electrical efficiency. The performance evaluation is important to optimize the cooling strategy of the collector in order to enhance its electrical efficiency and maximize the production of thermal energy. The evaluation process involves monitoring the electrical and thermal energies for a certain period of time and investigating the cooling effect on the performance through controlling the air mass flow provided by a variable speed fan connected to the collector by an air distribution duct. The distribution duct transfers the heated outlet air from the collector to inside the building. The PVT air collector consists of 34 Solibro CIGS type PV modules (115 Wp for each module) which are roof integrated and have replaced the traditional roof material. The collector is oriented toward the south-west with a tilt of 29 ᵒ. The collector consists of 17 parallel air ducts formed between the PV modules and the insulated roof surface. Each air duct has a depth of 0.05 m, length of 2.38 m and width of 2.38 m. The air ducts are connected to each other through holes. The monitoring system is based on using T-type thermocouples to measure the relevant temperatures, air sensor to measure the air mass flow. These parameters are needed to calculate the thermal energy. The monitoring system contains also voltage dividers to measure the PV modules voltage and shunt resistance to measure the PV current, and AC energy meters which are needed to calculate the produced electrical energy. All signals recorded from the thermocouples, voltage dividers and shunt resistances are connected to data loggers. The strategy of cooling in this work was based on switching the fan on, only when the difference between the air duct temperature (under the middle of top of PV column) and the room temperature becomes higher than 5 °C. This strategy was effective in term of avoiding high electrical consumption by the fan, and it is recommended for further development. The temperature difference of 5 °C is the minimum value to compensate the heat losses in the collecting duct and distribution duct. The PVT air collector has an area of (Ac=32 m2), and air mass flow of 0.002 kg/s m2. The nominal output power of the collector is 4 kWppv (34 CIGS modules with 115 Wppvfor each module). The collector produces thermal output energy of 6.88 kWth/day (0.21 kWth/m2 day) and an electrical output energy of 13.46 kWhel/day (0.42 kWhel/m2 day) with cooling case. The PVT air collector has a daily thermal energy yield of 1.72 kWhth/kWppv, and a daily PV electrical energy yield of 3.36 kWhel /kWppv. The fan energy requirement in this case was 0.18 kWh/day which is very small compared to the electrical energy generated by the PV collector. The obtained thermal efficiency was 8 % which is small compared to the results reported in literature for PVT air collectors. The small thermal efficiency was due to small operating air mass flow. Therefore, the study suggests increasing the air mass flow by a factor of 25. The electrical efficiency was fluctuating around 14 %, which is higher than the theoretical efficiency of the PV modules, and this discrepancy was due to the poor method of recording the solar irradiance in the location. Due to shading effect, it was better to use more than one pyranometer.
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Elias, Junior Antonio 1980. "Caracterização PVT de petróleo contendo CO2." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265759.

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Orientador: Osvair Vidal Trevisan
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: O presente trabalho trata da caracterização experimental de petróleo em misturas contendo diferentes conteúdos de CO2. Os resultados experimentais são analisados através de correlações de propriedades PVT e de simulação computacional. O trabalho visa atender a notável carência de dados públicos sobre propriedades termodinâmicas de petróleo contendo CO2. Os dados PVT avaliados neste estudo contemplam ponto de bolha, ponto de orvalho, razão de solubilidade do óleo, fator volume-formação do óleo, fator volume-formação do gás, fator de compressibilidade do gás, fator de inchamento do óleo, massa específica do óleo, densidade do gás, viscosidade do óleo. São também avaliadas as cromatografias do óleo do reservatório, recombinado e também as cromatografias dos gases coletados durante o ensaio de liberação diferencial. As correlações utilizadas na análise resultados foram as de Standing, Valko-McCain, Al-Shammasi, Dindoruk, Beggs-Robinson e Vasquez & Beggs. Os principais fatores de seleção das correlações foram o espectro de dados dos quais se originaram as correlações e a média do erro relativo absoluto. As correlações selecionadas reproduziram bem os resultados obtidos no laboratório para o fator volume-formação, a razão de solubilidade do gás, o ponto de bolha e a viscosidade. A simulação computacional foi aplicada na análise dos resultados e na obtenção do envelope de fases da mistura através do ajuste da equação de estado de Peng-Robinson. O método usado para a simulação foi o de Coats & Smart, porém foram feitas modificações desse método para um melhor ajuste. O método adaptado reproduziu adequadamente os dados experimentais, sendo que todos os ajustes apresentaram um desvio padrão percentual menor que 6%. O envelope de fases descrito pelo simulador é considerado representativo do sistema, com boa aproximação. Com os resultados obtidos, foram realizadas análises das propriedades da mistura e do comportamento do equilíbrio de fases em decorrência das variações das concentrações molares de CO2, da temperatura e da pressão. Foi a constatado o surgimento de uma terceira fase líquida em algumas condições de tese configurando um equilíbrio L-L-V
Abstract: The present work refers to the experimental characterization of petroleum mixtures with variable contents of CO2. The experimental results are, analyzed via PVT properties correlations and computer model simulations. The work aims to cover the remarkable lack of public data on thermodynamic properties of petroleum containing CO2. The PVT data analyzed in the study comprise bubble point, dew point, oil solubility rate, gas and oil formation volume factor, gas compressibility factor, swelling test, oil density, gas density, oil viscosity. The chromatography of the recombined reservoir oil and also the chromatography of gases mixture collected during the differential liberation test are also evaluated. The correlations used in the analysis of the results were Standing, Valko-McCain, Al-Shammasi, Dindoruk, Beggs-Robinson e Vasquez & Beggs. The principal criteria used in the selection of the correlations were the range of data which originated the correlations and the average absolute relative error. The correlations reproduced well the results obtained in the laboratory for the formation volume factor, gas solubility ratio, bubble point and viscosity. The computer model simulation was used to analyze the data and also to define the phase envelope of the mixture by adjusting Peng-Robinson's state equation. The method used in the simulation was developed by Coats & Smart, but some modifications were made to obtain a better match. The modified method reproduced adequately the experimental results, within a standard deviation less than 6%. The phase envelope obtained from the simulation is considered, with good approximation, representative of the system. Once with the results obtained were performed analyses of the properties and phase equilibrium behavior of the mixture related with the CO2 molar concentration, temperature and pressure. A third liquid phase was observed in some conditions of the tests configuring a L-L-V phase equilibrium
Doutorado
Reservatórios e Gestão
Doutor em Ciências e Engenharia de Petróleo
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Zeid, Nayef. "An Overview of PVT Module for the Extraction of Electricity and Heat." Thesis, Högskolan i Gävle, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-33998.

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The study sets out to review various literatures concerning photovoltaic/thermal (PVT) modules for the extraction of electricity and heat, it also reviews different PVT collectors as well as their performance. The study provides an understanding of a system that fully supports ecological society by promoting the use of solar modules from a different scope in future global resolutions. Furthermore, it looks into renewable energy in Sweden, solar energy and PVT systems, operational principles of hybrid PVT collectors, PVT applications, PVT market and legal face of PVT in Sweden among others. Among other social benefits, PVT system contributes enormously to energy savings and energy consumption which in turn lowers CO2 emissions. The review shows that PVT modules can provide homes and industries with 100% renewable electricity and heat that is affordable. This paper adopts systematic literature review, as it allows thorough cross-examination of various publications regarding the subject.
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Gammoh, Khalil Jacob. "PVT-Tolerant Stochastic Time-to-Digital Converter." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7692.

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Time-to-digital converters (TDC) are widely used in light-detection-and-ranging (LIDAR) systems to measure the time-of-flight. Conventional TDCs are sensitivity to process, voltage, and temperature (PVT) variations. Recent work utilizing the stochastic delay-line TDC architecture has demonstrated excellent robustness against PVT variations. But important issues affecting the linearity of a stochastic delay-line TDC has yet to be recognized and addressed.This thesis rigorously analyzes the problem of linearity of a stochastic delay-line TDC and formulates an intuitive theory to predict the linearity performance. Apolarvisualization of the phase distribution of a delay line is proposed to aid the analysis. Based on the results of this study, this thesis proposes a stochastic delay-line TDC employing a delay-locked loop (DLL) to guarantee linearity over PVT variations and to reduce the number of redundant bits. The proposed TDC is implemented in a 0.18 µm CMOS process to validate the linearity theory and the proposed solution. The 8-bit TDC samples at 60 MHz and demonstrates a linear-number-of-bit of 6.36 with only 2-bit redundancy. Consuming 25 mW from a 1.8 V supply, the TDC yields a figure-of-merit of 5.04 pJ/conversion-step. With the DLL turned off, the integral nonlinearity (INL) degrades by about a factor of two, verifying the effectiveness of the proposed solution. The TDC is measured at different temperatures and supply voltages to demonstrate robustness against PVT variations. The measurement results show excellent agreement with the behavioral simulations.
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Gomes, Garben Bravim. "Análise estatística de correlações PVT de petróleos." Universidade Federal do Espírito Santo, 2008. http://repositorio.ufes.br/handle/10/6238.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Uma estimação precisa do comportamento do reservatório é necessária para a avaliação das reservas de hidrocarbonetos, previsão de desempenho futuro desenvolvimento das instalações de produção e planejamento de métodos eficazes de recuperação de óleo. No entanto, a medição de todas as propriedades do petróleo durante a operação de um poço exploratório é inviável por causa do tempo demandado para a completa caracterização. O problema é contornado com a medição de algumas propriedades, a partir das quais se estimam outras. Com esta finalidade diversos modelos foram desenvolvidos nos últimos anos para relacionar, de forma eficiente, as propriedades do fluido do reservatório como, por exemplo, fator volume de formação, razão de solubilidade, pressão de saturação, temperatura, grau API, densidade etc. Estes modelos são conhecidos na literatura e indústria como correlações PVT, dentre as quais as mais conhecidas são de Standing, Glaso e Vazquez-Beggs. Diversas modificações dessas correlações têm sido introduzidas nos últimos anos por De Ghetto, Al Marroun, Petrosky, dentre outros. Neste trabalho apresentamos, com aplicação de um ferramental estatístico adequado, uma análise destas das correlações PVT que estimam a pressão de saturação propostas por Standing, Glaso e Vazquez-Beggs. Os dados experimentais utilizados são os apresentados por De Ghetto et al. (1995).
A precise estimation of a reservoir behavior is very important for the correct evaluation of hydrocarbons amount, prediction of the performance, development of production facilities and planning of efficient recuperation methods. But direct evaluation of all petroleum properties is not viable during operation of an exploratory well bore. This problem is solved by estimating some properties from others whose evaluation in laboratory is easier. Several correlations were proposed and commented in the literature for correlating oil formation volume factor, solubility ratio, bubble point pressure, reservoir temperature, oil gravity, gas gravity, and so on. These models have been nominated PVT correlations, although sometimes the include some non PVT properties as oil and gas viscosity. The most famous correlations is that proposed by Standing, Glaso and Vazquez-Beggs, which have been modified by other researchers as, for example, De Gheto, Al Marroun and Petrosky. In this work, we present statistical analysis of some correlations (for bubble point pressure estimation) for Standing, Glaso and Vazquez-Beggs correlations. The experimental data are that presented by De Gheto in 1995.
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Feitosa, Filipe Xavier. "Development of PVT methodology and mounting experimental apparatus." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14029.

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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior
The aim of this work was to assemble an experimental apparatus PVT skilled labor in obtaining phase equilibria at high pressures and determining efficient methodology. Tests were performed mounting apparatus in order to develop methodology. During these tests, the data bubble point of pure carbon dioxide were determined at temperatures of 25, 26, 27 and 28 Â C and compared with data obtained for similar equipment, providing average deviation of 0.4 Bar, 0.6% on the extent being of the same order of magnitude compared to similar equipment. For testing systems in which one liquid component is introduced at ambient pressure in the analysis phase equilibrium torque was analyzed ethanol-CO2 at 40 Â C, and also compared with the literature data. The results obtained in steps preliminary analyzes showed that the system was capable of developing new data phase equilibrium. The study continued with the application development methodology for systems of viscera from fish oil + carbon dioxide oil, fish viscera + carbon dioxide + ethanol, corn oil + carbon dioxide and corn oil + ethanol + carbon dioxide at temperatures of 40, 50, 60, 70, 80, 90 and 110 Â C for systems without ethanol at temperatures of 40, 60, 80 and 110 Â C, for others. The phase diagrams obtained for all systems studied were of type IV according to the classification of Von Konynen and Scott, which is similar to that found in literature phase diagrams for systems consisting of triglycerides and carbon dioxide, showing the ability development of new data for the set-apparatus developed methodology.
O objetivo desta dissertaÃÃo foi montar um aparato experimental PVT hÃbil ao trabalho na obtenÃÃo de equilÃbrio de fases em altas pressÃes e a determinaÃÃo de metodologia eficiente. Testes de montagem no aparato foram realizados com o intuito de desenvolver a metodologia. Durantes estes testes, dados do ponto de bolha do diÃxido de carbono puro foram determinados em temperaturas de 25, 26, 27 e 28 ÂC e comparados com dados obtidos para equipamentos similares, fornecendo desvio mÃdio de 0,4 Bar, 0,6 % relativo à medida, sendo da mesma ordem de grandeza em relaÃÃo a equipamentos similares. Para testes de sistemas em que um componente lÃquido à pressÃo ambiente fosse introduzido nas anÃlises de equilÃbrio de fases o binÃrio etanol-CO2 foi analisado a 40 ÂC, e tambÃm comparado com dados da literatura. Os resultados obtidos nas etapas de anÃlises preliminares mostraram que o sistema estava apto a desenvolver novos dados de equilÃbrio de fases. Os estudos prosseguiram com o desenvolvimento da aplicaÃÃo da metodologia para os sistemas de Ãleo de vÃscera de peixe + diÃxido de carbono, Ãleo de vÃscera de peixe + etanol + diÃxido de carbono, Ãleo de milho + diÃxido de carbono e Ãleo de milho + etanol + diÃxido de carbono nas temperaturas de 40, 50, 60, 70, 80, 90 e 110 ÂC para os sistemas sem etanol e nas temperaturas de 40, 60, 80 e 110 ÂC, para os demais. Os diagramas de fases obtidos para todos os sistemas estudados foram do tipo IV de acordo com a classificaÃÃo de Von Konynen e Scott, o que se assemelha ao encontrado na literatura de diagramas de fase para sistemas constituÃdos de triglicerÃdeos e diÃxido de carbono, mostrando a capacidade de desenvolvimento de novos dados para o conjunto metodologia-aparato desenvolvido.
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Feitosa, Filipe Xavier. "Desenvolvimento de metodologia PVT e montagem de aparato experimental." reponame:Repositório Institucional da UFC, 2013. http://www.repositorio.ufc.br/handle/riufc/11739.

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FEITOSA, F. X. Desenvolvimento de metodologia PVT e montagem de aparato experimental. 2013. 63 f. Dissertação (Mestrado em Engenharia Química) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2013.
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The aim of this work was to assemble an experimental apparatus PVT skilled labor in obtaining phase equilibria at high pressures and determining efficient methodology. Tests were performed mounting apparatus in order to develop methodology. During these tests, the data bubble point of pure carbon dioxide were determined at temperatures of 25, 26, 27 and 28 ° C and compared with data obtained for similar equipment, providing average deviation of 0.4 Bar, 0.6% on the extent being of the same order of magnitude compared to similar equipment. For testing systems in which one liquid component is introduced at ambient pressure in the analysis phase equilibrium torque was analyzed ethanol-CO2 at 40 ° C, and also compared with the literature data. The results obtained in steps preliminary analyzes showed that the system was capable of developing new data phase equilibrium. The study continued with the application development methodology for systems of viscera from fish oil + carbon dioxide oil, fish viscera + carbon dioxide + ethanol, corn oil + carbon dioxide and corn oil + ethanol + carbon dioxide at temperatures of 40, 50, 60, 70, 80, 90 and 110 ° C for systems without ethanol at temperatures of 40, 60, 80 and 110 ° C, for others. The phase diagrams obtained for all systems studied were of type IV according to the classification of Von Konynen and Scott, which is similar to that found in literature phase diagrams for systems consisting of triglycerides and carbon dioxide, showing the ability development of new data for the set-apparatus developed methodology
O objetivo desta dissertação foi montar um aparato experimental PVT hábil ao trabalho na obtenção de equilíbrio de fases em altas pressões e a determinação de metodologia eficiente. Testes de montagem no aparato foram realizados com o intuito de desenvolver a metodologia. Durantes estes testes, dados do ponto de bolha do dióxido de carbono puro foram determinados em temperaturas de 25, 26, 27 e 28 °C e comparados com dados obtidos para equipamentos similares, fornecendo desvio médio de 0,4 Bar, 0,6 % relativo à medida, sendo da mesma ordem de grandeza em relação a equipamentos similares. Para testes de sistemas em que um componente líquido à pressão ambiente fosse introduzido nas análises de equilíbrio de fases o binário etanol-CO2 foi analisado a 40 °C, e também comparado com dados da literatura. Os resultados obtidos nas etapas de análises preliminares mostraram que o sistema estava apto a desenvolver novos dados de equilíbrio de fases. Os estudos prosseguiram com o desenvolvimento da aplicação da metodologia para os sistemas de óleo de víscera de peixe + dióxido de carbono, óleo de víscera de peixe + etanol + dióxido de carbono, óleo de milho + dióxido de carbono e óleo de milho + etanol + dióxido de carbono nas temperaturas de 40, 50, 60, 70, 80, 90 e 110 °C para os sistemas sem etanol e nas temperaturas de 40, 60, 80 e 110 °C, para os demais. Os diagramas de fases obtidos para todos os sistemas estudados foram do tipo IV de acordo com a classificação de Von Konynen e Scott, o que se assemelha ao encontrado na literatura de diagramas de fase para sistemas constituídos de triglicerídeos e dióxido de carbono, mostrando a capacidade de desenvolvimento de novos dados para o conjunto metodologia-aparato desenvolvido
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ASSIS, G. J. A. "Análise Estatística de Correlações de Propriedades PVT de Petróleos." Universidade Federal do Espírito Santo, 2008. http://repositorio.ufes.br/handle/10/4127.

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Uma estimação precisa do comportamento do reservatório é necessária para a avaliação das reservas de hidrocarbonetos, previsão de desempenho futuro desenvolvimento das instalações de produção e planejamento de métodos eficazes de recuperação de óleo. No entanto, a medição de todas as propriedades do petróleo durante a operação de um poço exploratório é inviável por causa do tempo demandado para a completa caracterização. O problema é contornado com a medição de algumas propriedades, a partir das quais se estimam outras. Com esta finalidade diversos modelos foram desenvolvidos nos últimos anos para relacionar, de forma eficiente, as propriedades do fluido do reservatório como, por exemplo, fator volume de formação, razão de solubilidade, pressão de saturação, temperatura, grau API, densidade etc. Estes modelos são conhecidos na literatura e indústria como correlações PVT, dentre as quais as mais conhecidas são de Standing, Glaso e Vazquez-Beggs. Diversas modificações dessas correlações têm sido introduzidas nos últimos anos por De Ghetto, Al Marroun, Petrosky, dentre outros. Neste trabalho apresentamos, com aplicação de um ferramental estatístico adequado, uma análise destas das correlações PVT que estimam a pressão de saturação propostas por Standing, Glaso e Vazquez-Beggs. Os dados experimentais utilizados são os apresentados por De Ghetto et al. (1995). Palavras chaves: Correlações, Propriedades PVT, Reservatórios de Petróleo.
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Lämmle, Manuel [Verfasser], and Hans-Martin [Akademischer Betreuer] Henning. "Thermal management of PVT collectors : : development and modelling of highly efficient glazed, flat plate PVT collectors with low emissivity coatings and overheating protection." Freiburg : Universität, 2018. http://d-nb.info/1168145651/34.

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Books on the topic "Pvt"

1

McLure, James. Pvt. wars. New York, N.Y. (440 Park Ave. S., New York 10016): Dramatists Play Service, 1990.

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Schloat, Don T. Freedom!: Bataan, POW, PVT. Valley Center, CA (29326 The Yellow Brick Road, Valley Center 92082): D.T. Schloat, 1995.

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Klien, Kevin. Pvt Joe Snuffy goes guard. [Washington, D.C.?: National Guard Bureau, 1991.

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Pvt. wars: Full-length version. New York, N.Y: Dramatists Play Service, 1990.

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Messres Dickens, Doyle & Wodehouse Pvt. Ltd. Allahabad: Halcyon Books, 2005.

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Ltd, Central Depository Systems Pvt. Central Depository Systems Pvt. Ltd.: Rules. [Colombo: Central Depository Systems, Pvt. Ltd.], 2000.

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Max, Thorn, and Assange Julian, eds. The United States vs. Pvt. Chelsea Manning. New York: OR Books, 2014.

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Krishnamurthy, A. G. The invisible CEO: My Mudra years, including AGKspeak. New Delhi: Tata McGraw-Hill Pub. Co., 2005.

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PVT and phase behaviour of petroleum reservoir fluids. Amsterdam: Elsevier, 1998.

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World Travel & Tourism Council. Trinity Excursion Pvt Ltd: Progress and priorities 1995. [Oxford]: The Council, 1995.

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Book chapters on the topic "Pvt"

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Braun-Falco, Markus, Henry J. Mankin, Sharon L. Wenger, Markus Braun-Falco, Stephan DiSean Kendall, Gerard C. Blobe, Christoph K. Weber, et al. "PVT." In Encyclopedia of Molecular Mechanisms of Disease, 1788. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-29676-8_6604.

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Gooch, Jan W. "PVT Relationship." In Encyclopedic Dictionary of Polymers, 598. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9649.

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Sayil, Selahattin. "PVT Variations." In Noise Contamination in Nanoscale VLSI Circuits, 131–34. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12751-9_8.

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Bhushan, Manjul, and Mark B. Ketchen. "Embedded PVT Monitors." In CMOS Test and Evaluation, 159–99. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1349-7_5.

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Rachid, Ahmed, Aytac Goren, Victor Becerra, Jovana Radulovic, and Sourav Khanna. "Solar PVT Systems." In Power Systems, 83–104. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-20830-0_5.

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Shinde, Suhas Vishwasrao. "PVT Insensitive IREF Generation." In Transactions on Engineering Technologies, 195–204. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9588-3_15.

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Pionteck, J., and M. Pyda. "Introduction to pVT Data." In Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_1.

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Pionteck, J., and M. Pyda. "pVT Data of Polysiloxanes." In Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 162–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_27.

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Pionteck, J., and M. Pyda. "pVT Data of Polystyrenes." In Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 191–202. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_35.

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Tewari, Raj Deo, Abhijit Y. Dandekar, and Jaime Moreno Ortiz. "EOS and PVT Simulations." In Petroleum Fluid Phase Behavior, 355–70. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2019. | Series: Emerging trends & technologies in petroleum engineering: CRC Press, 2018. http://dx.doi.org/10.1201/9781315228808-11.

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Conference papers on the topic "Pvt"

1

Islam, A. K. M. Mahfuzul, and Hidetoshi Onodera. "PVT 2." In ICCAD '18: IEEE/ACM INTERNATIONAL CONFERENCE ON COMPUTER-AIDED DESIGN. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3240765.3243491.

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Fritzsche, Ulrich. "PVT Performance Prediction." In ISES Solar World Conference 2017 and the IEA SHC Solar Heating and Cooling Conference for Buildings and Industry 2017. Freiburg, Germany: International Solar Energy Society, 2017. http://dx.doi.org/10.18086/swc.2017.19.04.

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Bouett, L. W., A. Sageev, and F. M. Orr. "Simulation of PVT Experiments." In Petroleum Industry Application of Microcomputers. Society of Petroleum Engineers, 1987. http://dx.doi.org/10.2118/16502-ms.

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De Ghetto, Giambattista, and Marco Villa. "Reliability Analysis on PVT Correlations." In European Petroleum Conference. Society of Petroleum Engineers, 1994. http://dx.doi.org/10.2118/28904-ms.

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Cherukuri, Venkata Snehith, and Kasim Selçuk Candan. "Propagation-vectors for trees (PVT)." In Proceeding of the 2008 ACM workshop. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1458469.1458481.

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Molla, Shahnawaz, and Farshid Mostowfi. "Microfluidic Platform for PVT Measurements." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2014. http://dx.doi.org/10.2118/170910-ms.

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Brakstad, F., T. Bu, O. P. Bjorlykke, and K. Mykkeltvedt. "A Complex PVT Modeling Study." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1988. http://dx.doi.org/10.2118/18314-ms.

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Furbo, Simon, Bengt Perers, Janne Dragsted, Sahand Hosouli, João Gomes, Jovita Kaziukonytė, Evaldas Sapeliauskas, et al. "Best Practices for PVT Technology." In ISES Solar World Congress 2021. Freiburg, Germany: International Solar Energy Society, 2021. http://dx.doi.org/10.18086/swc.2021.22.04.

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Wu, R., and L. Rosenegger. "Comparison of PVT Properties From Equation of State Analysis And PVT Correlations For Reservoir Studies." In Annual Technical Meeting. Petroleum Society of Canada, 1999. http://dx.doi.org/10.2118/99-38.

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Ille, Fabian, Hans-Peter Wirth, Radojka Radosavljevic, and Mario Adam. "Market and Simulation Analysis of PVT Applications for the Determination of New PVT Test Procedures." In EuroSun 2014. Freiburg, Germany: International Solar Energy Society, 2015. http://dx.doi.org/10.18086/eurosun.2014.16.09.

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Reports on the topic "Pvt"

1

Kramer, K. Status Quo of PVT Characterization. Edited by Korbinian Kramer,. IEA SHC Task 60, September 2020. http://dx.doi.org/10.18777/ieashc-task60-2020-0004.

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Report B1: This report therefore aims at displaying the Status Quo of PVT Characterization in order to support PVT technology in its further development and applications. The report is hence of interest for researchers as well as public and private sector stakeholders. A key finding is that the reliability and durability of PVT modules are especially challenged at elevated temperatures and higher humidity loads. The test methods available from the IEC and ISO standards are covering the specifics of PV and ST module’s, most of which are similar for PVT modules, too.
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Cho, Herman M., and Richard T. Kouzes. PVT Degradation Studies: NMR Analysis. Office of Scientific and Technical Information (OSTI), June 2017. http://dx.doi.org/10.2172/1411933.

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Dib, Gerges, Brian J. Tucker, Richard T. Kouzes, and Philip J. Smith. PVT Degradation Studies: Acoustic Diagnostics. Office of Scientific and Technical Information (OSTI), April 2017. http://dx.doi.org/10.2172/1411935.

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Mitchell, Dean James, and Charles A. Brusseau. PVT-NG sensor final report. Office of Scientific and Technical Information (OSTI), January 2012. http://dx.doi.org/10.2172/1034884.

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Hadorn, JC, M. Lämmle, K. Kramer, G. Munz, G. Ryan, M. Herrando, and L. Brottier. Design guidelines for PVT collectors. IEA SHC Task 60, July 2020. http://dx.doi.org/10.18777/ieashc-task60-2020-0003.

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Report B2: Here is a one page fact sheet providing many design guidelines for PVT collectors, for covers, encapsulant, rear covers, absorbers, heat transfer medium, insulation, casing, air vents, fluid outlets, sealing, and junction boxes.
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Kouzes, Richard T. PVT Analysis With A Deconvolution Algorithm. Office of Scientific and Technical Information (OSTI), February 2011. http://dx.doi.org/10.2172/1018154.

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Zenhäusern, Daniel. Key Performance Indicators for PVT Systems. IEA SHC Task 60, November 2020. http://dx.doi.org/10.18777/ieashc-task60-2020-0007.

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Report D1: The aim of this report is to provide precise definitions of useful KPI’s for PVT systems. Where possible, these definitions correspond to those used in the technology fields of solar thermal systems and photovoltaic systems. In particular, the KPI's for the thermal performance of PVT systems are to a considerable extent based on the definitions adopted in IEA SHC Task 44 (Hadorn 2015). The stipulation and use of standardized KPI’s and notations will be essential for the comparability of different research results.
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Schubert, Maike, and Daniel Zenhäusern. Performance Assessment of Example PVT-Systems. IEA SHC Task 60, December 2020. http://dx.doi.org/10.18777/ieashc-task60-2020-0009.

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The performance of 26 PVT-Systems was analysed and compared in IEA-SHC Task 60. The systems are located in countries with different climatic conditions. The applications range from direct domestic hot water production and heating of public swimming pools to heat pump systems with PVT as the main heat source of the heat pump. The Key Performance Indicators (KPIs) determined for the different PVT solutions give the possibility to compare the systems despite their diversity. The goal was to show the potential of PVT collectors in different fields of application. The results show that the integration of PVT collectors in different kinds of well-dimensioned systems leads to competitive solutions, both from an energy and a financial perspective. Additionally the answers to a survey about control strategies for PVT systems, showing some main problems and possible solutions, are summarised.
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Jonas, Danny. Visualization of energy flows in PVT systems. IEA SHC Task 62, October 2019. http://dx.doi.org/10.18777/ieashc-task60-2019-0001.

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Mitchell, Dean James, and Charles A. Brusseau. Neutron counting and gamma spectroscopy with PVT detectors. Office of Scientific and Technical Information (OSTI), June 2011. http://dx.doi.org/10.2172/1020503.

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