An introduction to heat transfer

Introduction to heat transfer

Review of passive PCM latent heat thermal energy storage systems towards buildings’ energy efficiency

System of experimental design : engineering methods to optimize quality and minimize costs

Ng Y-L, Mann V, Gulabivala K. A prospective study of the factors affecting outcomes of nonsurgical root canal treatment: part 1: periapical health. International Endodontic Journal. Aim To investigate the probability of and factors influencing periapical status of teeth following primary (1! RCTx) or secondary (2! RCTx) root canal treatment. Methodology This prospective study involved annual clinical and radiographic follow-up of 1! RCTx (1170 roots, 702 teeth and 534 patients) or 2! RCTx (1314 roots, 750 teeth and 559 patients) carried out by Endodontic postgraduate students for 2‐4 (50%) years. Pre-, intra- and postoperative data were collected prospectively on customized forms. The proportion of roots with complete periapical healing was estimated, and prognostic factors were investigated using multiple logistic regression models. Clustering effects within patients were adjusted in all models using robust standard error. Results The proportion of roots with complete periapical healing after 1! RCTx (83%; 95% CI: 81%, 85%) or 2! RCTx (80%; 95% CI: 78%, 82%) were similar. Eleven prognostic factors were identified. The conditions that were found to improve periapical healing significantly were: the preoperative absence of a periapical lesion (P = 0.003); in presence of a periapical lesion, the smaller its size (P £ 0.001), the better the treatment prognosis; the absence of a preoperative sinus tract (P = 0.001); achievement of patency at the canal terminus (P = 0.001); extension of canal cleaning as close as possible to its apical terminus (P = 0.001); the use of ethylene-diaminetetra-acetic acid (EDTA) solution as a penultimate wash followed by final rinse with NaOCl solution in 2! RCTx cases (P = 0.002); abstaining from using 2% chlorexidine as an adjunct irrigant to NaOCl solution (P = 0.01); absence of tooth/root perforation (P = 0.06); absence of interappointment flare-up (pain or swelling) (P = 0.002); absence of root-filling extrusion (P £ 0.001); and presence of a satisfactory coronal restoration (P £ 0.001). Conclusions Success based on periapical health associated with roots following 1! RCTx (83%) or 2! RCTx (80%) was similar, with 10 factors having a common effect on both, whilst the 11th factor ‘EDTA as an additional irrigant’ had different effects on the two treatments.

https://www.endoexperience.com/documents/Aprospectivestudyofthefactorsaffectingoutcomesofnonsurgicalrootcanaltreatment-part1-periapic.pdf

A prospective study of the factors affecting outcomes of nonsurgical root canal treatment: part 1: periapical health.

Effects of wavy surface characteristics on natural convection heat transfer in a cosine corrugated square cavity filled with nanofluid

The objective of this paper is computational investigation of the carbon black production through thermal decomposition of waste gases containing CH4 and H2 S, without requiring a H2 S separation process. The chemical reaction model, which involves solid carbon, sulfur compounds and precursor species for formation carbon black, based on an assumed Probability Density Function (PDF) parameterized by the mean and variance of mixture fraction and β-PDF shape. The soot formation is modeled by using the soot particle number density and the mass density based on acetylene concentrations. The effects of feedstock mass flow rate and reactor temperature on carbon black, soot, CO, S2 , SO2 , COS and CS2 formation are investigated. The results show that the major factor influencing CH4 and H2 S conversions is reactor temperature. The results reveal that at any temperature, H2 S conversion is less than that of CH4 . For temperatures higher than 1100°K, the reactor CH4 conversion reaches 100%. At temperatures below 1300°K, H2 S conversion is too low and usually less than 5%. For temperatures higher than 1300°K, H2 S conversion increases sharply with temperature and the major products of the process are S2 and SO2 while COS and CS2 are minor products. The results also show that the production of carbon black from sub-quality natural gas, process involving the formation of carbon monoxide which is occurring in parallel, play a very significant role. For lower values of feedstock flow rate, CH4 mostly burns to CO and consequently, the production of carbon black is low.Copyright © 2008 by ASME

The Effect of H2S on Production of Carbon Black From Sub-Quality Natural Gas

Gasification of heavy fuel oils: A thermochemical equilibrium approach

Effects of nano-additives on pollutants emission and engine performance in a urea-SCR equipped diesel engine fueled with blended-biodiesel

https://profdoc.um.ac.ir/articles/a/1031692.pdf

Mohammad Moghiman

Papers

Effects of wavy surface characteristics on natural convection heat transfer in a cosine corrugated square cavity filled with nanofluid

The Effect of H2S on Production of Carbon Black From Sub-Quality Natural Gas

Gasification of heavy fuel oils: A thermochemical equilibrium approach

Effects of nano-additives on pollutants emission and engine performance in a urea-SCR equipped diesel engine fueled with blended-biodiesel

Fully nonlinear viscous wave generation in numerical wave tanks