We present solutions of the holomorphic anomaly equations for compact two-parameter Calabi-Yau manifolds which are hypersurfaces in weighted projective space. In particular we focus on K3-fibrations where due to heterotic type II duality the topological invariants in the fibre direction are encoded in certain modular forms. The formalism employed provides holomorphic expansions of topological s...

Wearing face coverings outside should be normalised because it may reduce transmission of SARS-CoV-2 in some situations—and encourage mask wearing indoors, where risks are greater—say Babak Javid, Dirk Bassler, and Manuel B Bryant. But Muge Cevik, Zeynep Tufekci, Stefan Baral argue that outdoor contributes very little to overall infection rates efforts ...

mathematics curriculum in schools is always a key position and is considered as an essential knowledge. so it is taught in the first years of school curriculum. this knowledge has focused on calculating the initial period. so this part of mathematics play an important role in lives of all people so this knowledge is essential for learning today. in the early years of primary school children, th...

The archaeological site of Shahr-i Sokhta, in the Sistan region south-eastern Iran, is noted for exceptional preservation human remains documented its necropolis. This report describes results a non-destructive multidisciplinary investigation into double burial excavated at preserving two skeletons subadults. first part this study provides an archaeotanatological and bioarchaeological descripti...

introduction: e-learning is one of the most important and common paradigms of ict in educational areas. it may help promote creativity, an important, basic and effective component of human life. the aim of this paper is to study the effect of e-learning on students' creativity at meshkinshahr payame noor university in the 2012-2013 academic year.materials and methods: a quasi experimental ...

This research is action research, because the was conducted to solve learning problems in classroom. also includes descriptive it describes how a technique applied and desired results can be achieved. The observation divided into two rounds, namely rounds 1 2, where each round given same treatment (same flow of activities) discussion sub-subjects which ended with formative test at end round. Ma...

the purpose of the present study was to determine the prevalence rate of mental disorders in factory workers in shahr-e-kord and brojen. following a pilot study and determination of cut-off point for the srq-24 questionnaire, the study was carried out in two stages. in the first stage, 503 subjects were administered the questionnaire and in the second stage, 148 subjects who had scores equal to...