The calibration of ion chambers in high-energy electron beams in terms of absorbed dose to water at the National Physical Laboratory requires knowledge of the ratio of perturbation factors in graphite and water phantoms. During a review of data required for the NPL calibration procedure an empirical model was developed to calculate the perturbation due to the rear wall, pwall, of a well-guarded...

Climate science has confirmed the alteration of hydrological cycle attributed to global warming. This warming tendency affects monsoon precipitation in Pakistan with an unprecedented intensity, causing severe flooding. Therefore, it is inevitable observe recent spring and summer changes extreme throughout Pakistan. The present study examined 8 indices past 50-year period (1971–2020) (stretched ...

The purpose of this article is to evaluate the accuracy optical coherence tomography (OCT) measurement choroidal thickness in healthy eyes using a deep-learning method with Mask R-CNN model. Thirty EDI-OCT thirty patients were enrolled. A mask region-based convolutional neural network (Mask R-CNN) model composed deep residual (ResNet) and feature pyramid networks (FPNs) standard convolution ful...

The Cyclone Global Navigation Satellite System (CYGNSS) consists of a constellation of eight microsatellites that provide observations of surface wind speed in all precipitating conditions. A method for estimating tropical cyclone (TC) metrics—maximum surface wind speed VMAX, radius of maximum surface wind speed RMAX, and wind radii (R64, R50, and R34)—from CYGNSS observations is developed and ...

The aim of the present study was to prospectively assess the frequency of teeth in which the Reciproc instruments were able to reach the full working length (WL). This case series study enrolled 277 consecutive teeth requiring primary endodontic treatment performed with the Reciproc system (VDW) without a previous glide path by 3 experienced endodontists. Instruments R25, R40 or R50 were select...

Raisins are popular snacks with a favourable nutrient profile, being high in dietary fibre, polyphenols and a number of vitamins and minerals, in addition to being rich in fructose. In light of evidence demonstrating improvements in glycaemic control with moderate fructose intake and low-glycaemic index (GI) fruits, our aim was to determine the GI, insulin index (II) and postprandial responses ...

Abstract This study compared estimates of gale-force wind radii (R30 or R34) and storm-force (R50) tropical cyclones (TC) by three agencies—the Korea Meteorological Administration (KMA), the Regional Specialized Center (RSMC) Tokyo, Joint Typhoon Warning (JTWC)—in western North Pacific during 2015–2018 investigated characteristics these estimates. The results showed that KMA’s R30 R50 were smal...

.............................................................2 INTRODUCTION.....................................................2 BACKGROUND OF DEVELOPMENT OF INDUSTRIAL –USE-UNMANNED HELICOPTERS........................................................2 PROTOTYPE MODEL OF 'RCASS' COUNTERREVOLUTION DUAL-ROTOR HELICOPTER ....3 DEVELOPMENT OF FIRST MODEL 'R50' ..........3 ATTITUDE CONTROL DEVICE,' ...

Aim: To compare the efficacy of various instrumentation techniques for removing obturating material from root canals using Cone Bean Computed Tomography (CBCT). Materials and Methods: Thirty extracted human premolar teeth, each with a single canal were selected. The root canals were prepared upto F4 ProTaper file and obturated with corresponding gutta percha cone. Teeth were divided into three ...

The objective of the present study was to assess the effectiveness of reciprocating instrumentation in disinfecting oval-shaped root canals infected with Enterococcus faecalis. Forty-five human lower premolars were infected with a culture of E. faecalis (ATCC 29212) for 28 days. Five other teeth that were neither contaminated nor instrumented were used as controls. The 45 specimens were divided...