In the treatment of superficial lesions with 8-13 MeV electrons, lead shields are often used to protect the underlying tissue. Measurements were made with film and ion chamber to analyse various aspects of external and internal shielding in electron beam therapy. Data were obtained on the thickness of lead required for shielding, the effect of blocking on dose-rate, electron-backscattering from...

A class of hyperrings known as divisible will be studied in this paper. It presented each element hyperring is a element. Also shows the relationship between Jacobsen Radical, and set invertible elements gets some results, linked these results with hyperring. After going through concept hypermodule that by Sopon Boriboon Sajee Pianskool 2017, later 2022 Hashem Bordbar, Irina Cristea, related to...

Naḥūm was a Kurdish Jewish prophet who lived in northern Syria the period of Assyrian conquests and internecine wars over 2,500 years ago. Part Naḥūm’s long poem, which is Kurdish-Persian genre Shāḥnāma has since been included canonized Hebrew Bible. The first chapter Book Naḥūm, henceforth Section I song praise (panegyric) introducing main protagonist – this case HaShem. II III carry on with n...

This paper documents the design, implementation, and evaluation of an online learning community (OLC), within Republic Ireland, which set out to support student teachers in a hybrid space during their school placement experience. Guided by qualitative research, data collection methods included interviews analysis students’ forum postings. Key findings illustrated that OLC provided valuable cont...

Several tests of a unit root in Multiple Regime STAR models and in the Time-Varying STAR model are presented. The number of regimes may be set arbitrarily and the transition variable may be endogenously or exogenously determined. The tests are easy to apply and are conducted by OLS under the assumption of weakly dependent heterogeneously distributed errors. Key words: Unit roots, Multiple Regim...

| Neural networks based model-ing often involves trying multiple networks with diierent architectures and/or training parameters in order to achieve acceptable model accuracy. Typically, one of the trained NNs is chosen as best, while the rest are discarded. Hashem and Schmeiser 1] propose using optimal linear combinations of a number of trained neural networks instead of using a single best ne...

Isolation of mesenchymal stromal cells (MSCs) from the umbilical cord blood (UCB) has a success rate of 25% and is frequently contaminated by osteoclast-like cells (OLCs). CD271 is a well-known marker for the enrichment of bone marrow (BM) MSCs. We have assessed the effect of CD271 isolation on the isolation rate of MSCs from UCB. Twenty-one samples of UCB were collected. Ten samples of UCB and...

We thank the editor M. Hashem Pesaran and three anonymous referees for their useful comments. 1 Summary We propose a new method for estimating dynamic panel data models with selection. The method uses backward substitution for the lagged dependent variable, which leads to an estimating equation that requires correcting for contemporaneous selection only. The estimator is valid under relatively ...