http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
EXERGY ANALYSIS OF A VAPOR ABSORPTION HEAT TRANSFORMER USING MODIFIED GUOY–STODALA EQUATION
J. PASTOR,G. SACHDEVA,R. BILASH 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.3
In the present work, thermodynamic analysis of a Lithium bromide–water-based absorption heat transformer (AHT) is done using a mathematical model. The study includes exergy analysis with the introduction of external fluid arrangements working as the interface of heat exchange for the various components of the model. Quantitative results are obtained for a set of inputs and modified Guoy–Stodala equation is used to include the real heat exchange temperatures in the study. These results are compared to the classical approach. It is observed that the total irreversibility calculated by the modified approach comes out to be 26.1% more than the exergy destruction obtained by the classical approach. Next, different operating parameters are varied to understand the effect of these on exergy destruction using a computer programme code. Thus, a conclusion is drawn in the form of graphs, as to how the system performance can be improved. Using the concept of irreversibility, the study finds that the performance of the system can be enhanced by decreasing the temperature of evaporator and generator or by increasing the temperature of condenser and absorber.
J. V. PASTOR,R. PAYRI,J. M. SALAVERT,J. MANIN 한국자동차공학회 2012 International journal of automotive technology Vol.13 No.5
Spray sizing that records fluorescent emission and scattered light has been widely applied to spray diagnostics over the last two decades. Different experimental strategies have been developed, but comparing the different solutions offered has remained of interest to experimentalists. In this work, a comparison of two fluorescence strategies for measuring droplet size in the liquid phase of a last-generation DI diesel spray is conducted. The natural fluorescent emission of a commercial diesel fuel and the fluorescence emitted by a tracer (Rhodamine B) are compared using theoretical and experimental approaches. The LIF/Mie ratio commonly called Planar Droplet Sizing (PDS) technique is applied in two different ways to elucidate the possible advantages of using a fluorescent dopant. The sprays were injected under non-evaporative conditions into a constant pressure vessel that simulates densities present at the moment of injection in currently used passenger car diesel engines. Characterization of the signal properties was performed by measuring the absorption coefficient, fluorescence emission spectrum, quantum yield and lifetime of both configurations. The scattered light and fluorescence intensities were calculated to verify the dependencies of the droplet surface and volume. When applying the two techniques to quantify droplet size in dense diesel sprays, the results show that signal weakness and lack of control over the properties of natural fluorescence produce distortion in the shape of the spray and cause measurements to be unreliable.
Minimal perceptrons for memorizing complex patterns
Pastor, M.,Song, J.,Hoang, D.T.,Jo, J. North-Holland Pub. Co 2016 PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIO Vol.462 No.-
Feedforward neural networks have been investigated to understand learning and memory, as well as applied to numerous practical problems in pattern classification. It is a rule of thumb that more complex tasks require larger networks. However, the design of optimal network architectures for specific tasks is still an unsolved fundamental problem. In this study, we consider three-layered neural networks for memorizing binary patterns. We developed a new complexity measure of binary patterns, and estimated the minimal network size for memorizing them as a function of their complexity. We formulated the minimal network size for regular, random, and complex patterns. In particular, the minimal size for complex patterns, which are neither ordered nor disordered, was predicted by measuring their Hamming distances from known ordered patterns. Our predictions agree with simulations based on the back-propagation algorithm.
Deep probing of the photospheric sunspot penumbra: no evidence of field-free gaps
Borrero, J. M.,Asensio Ramos, A.,Collados, M.,Schlichenmaier, R.,Balthasar, H.,Franz, M.,Rezaei, R.,Kiess, C.,Orozco Suá,rez, D.,Pastor, A.,Berkefeld, T.,von der Lü,he, O.,Schmidt, D.,Schmid Springer-Verlag 2016 Astronomy and astrophysics Vol.596 No.-
Upper chromospheric magnetic field of a sunspot penumbra: observations of fine structure
Joshi, J.,Lagg, A.,Solanki, S. K.,Feller, A.,Collados, M.,Orozco Suá,rez, D.,Schlichenmaier, R.,Franz, M.,Balthasar, H.,Denker, C.,Berkefeld, T.,Hofmann, A.,Kiess, C.,Nicklas, H.,Pastor Yabar, A Springer-Verlag 2016 Astronomy and astrophysics Vol.596 No.-
E. Ferrer-Polonio,J.A. Mendoza-Roca,A. Iborra-Clar,J.L. Alonso-Molina,L. Pastor-Alcañiz 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-
Biological treatment of hypersaline wastewaters such as fermentation brine from table olive processing(FTOP), was carried out using four sequential biological reactors (SBRs). These wastewaters werecharacterized by conductivities higher than 90 mS cm 1 together with COD and total phenolsconcentration values of more than 15 g L 1 and 1000 mg L 1, respectively. In order to increase theorganic removal efficiency and to reduce the hydraulic retention time (HRT), extra nutrients were addedand pre-treatment by adsorption was performed. Results showed that the COD/N/P relationship, in theFTOP, of 250/5/1 was appropriate for the biological process reaching COD removal efficiencies of around80%. The FTOP adsorption pre-treatment with powder activated carbon for the reduction of phenolsconcentration to 400 mg L 1 led to a HRT reduction from 40 to 15 days, maintaining the COD and totalphenols removal percentages around 78% and 97%, respectively. On the other hand, g-Proteobacteria wasthe main bacterial class, representing around 74% of the microbial community in the reactors.
Reducing Unnecessary Testing in the Intensive Care Unit by Choosing Wisely
Ruth M. Kleinpell,J. Christopher Farmer,Stephen M. Pastores 대한중환자의학회 2018 Acute and Critical Care Vol.33 No.1
Overuse of laboratory and X-ray testing is common in the intensive care unit (ICU). This review highlights focused strategies for critical care clinicians as outlined by the Critical Care Societies Collaborative (CCSC) as part of the American Board of Internal Medicine Foundation’s Choosing Wisely® campaign. The campaign aims to promote the use of judicious testing and decrease unnecessary treatment measures in the ICU. The CCSC outlines five specific recommendations for reducing unnecessary testing in the ICU. First, reduce the use of daily or regular interval diagnostic testing. Second, do not transfuse red blood cells in hemodynamically stable, non-bleeding ICU patients with a hemoglobin concentration greater than 7 mg/dl. Third, do not use parenteral nutrition in adequately nourished critically ill patients within the first 7 days of ICU stay. Fourth, do not deeply sedate mechanically ventilated patients without a specific indication and without daily attempts to lighten sedation. Finally, do not continue life support for patients at high risk of death without offering patients and their families the alternative of comfort focused care. A number of strategies can be used to reduce unnecessary testing in the ICU, including educational campaigns, audit and feedback, and implementing prompts in the electronic ordering system to allow only acceptable indications when ordering routine testing. Greater awareness of the lack of outcome benefit and associated costs can prompt clinicians to be more mindful of ordering tests and procedures in order to reduce unnecessary testing in the ICU.
MicroRNAs and periodontal disease: a qualitative systematic review of human studies
Pablo Micó-Martínez,Pedro J. Almiñana-Pastor,Francisco Alpiste-Illueca,Andrés López-Roldán 대한치주과학회 2021 Journal of Periodontal & Implant Science Vol.51 No.6
Purpose: MicroRNAs (miRNAs) are epigenetic post-transcriptional regulators that modulate gene expression and have been identified as biomarkers for several diseases, including cancer. This study aimed to systematically review the relationship between miRNAs and periodontal disease in humans, and to evaluate the potential of miRNAs as diagnostic and prognostic biomarkers of disease. Methods: The review was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines (reference number CRD42020180683). The MEDLINE, Scopus, Cochrane Library, Embase, Web of Science, and SciELO databases were searched for clinical studies conducted in humans investigating periodontal diseases and miRNAs. Expression levels of miRNAs across the different groups were analysed using the collected data. Results: A total of 1,299 references were identified in the initial literature search, and 23 articles were finally included in the review. The study designs were heterogeneous, which prevented a meta-analysis of the data. Most of the studies compared miRNA expression levels between patients with periodontitis and healthy controls. The most widely researched miRNA in periodontal diseases was miR-146a. Most studies reported higher expression levels of miR-146a in patients with periodontitis than in healthy controls. In addition, many studies also focused on identifying target genes of the differentially expressed miRNAs that were significantly related to periodontal inflammation. Conclusions: The results of the studies that we analysed are promising, but diagnostic tests are needed to confirm the use of miRNAs as biomarkers to monitor and aid in the early diagnosis of periodontitis in clinical practice.
MicroRNAs and periodontal disease: a qualitative systematic review of human studies
Mico-Martinez, Pablo,Alminana-Pastor, Pedro J.,Alpiste-Illueca, Francisco,Lopez-Roldan, Andres Korean Academy of Periodontology 2021 Journal of Periodontal & Implant Science Vol.51 No.-
Purpose: MicroRNAs (miRNAs) are epigenetic post-transcriptional regulators that modulate gene expression and have been identified as biomarkers for several diseases, including cancer. This study aimed to systematically review the relationship between miRNAs and periodontal disease in humans, and to evaluate the potential of miRNAs as diagnostic and prognostic biomarkers of disease. Methods: The review was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines (reference number CRD42020180683). The MEDLINE, Scopus, Cochrane Library, Embase, Web of Science, and SciELO databases were searched for clinical studies conducted in humans investigating periodontal diseases and miRNAs. Expression levels of miRNAs across the different groups were analysed using the collected data. Results: A total of 1,299 references were identified in the initial literature search, and 23 articles were finally included in the review. The study designs were heterogeneous, which prevented a meta-analysis of the data. Most of the studies compared miRNA expression levels between patients with periodontitis and healthy controls. The most widely researched miRNA in periodontal diseases was miR-146a. Most studies reported higher expression levels of miR-146a in patients with periodontitis than in healthy controls. In addition, many studies also focused on identifying target genes of the differentially expressed miRNAs that were significantly related to periodontal inflammation. Conclusions: The results of the studies that we analysed are promising, but diagnostic tests are needed to confirm the use of miRNAs as biomarkers to monitor and aid in the early diagnosis of periodontitis in clinical practice.
Inference of magnetic fields in the very quiet Sun
Martí,nez Gonzá,lez, M. J.,Pastor Yabar, A.,Lagg, A.,Asensio Ramos, A.,Collados, M.,Solanki, S. K.,Balthasar, H.,Berkefeld, T.,Denker, C.,Doerr, H. P.,Feller, A.,Franz, M.,Gonzá,lez EDP Sciences 2016 Astronomy and astrophysics Vol.596 No.-