Some new nitrogen bridge-head pyrido[1,2-b][1,2,4]triazepines incorporating 6methylchromone moiety have been synthesized from the reaction of 1,6-diamino-4-(6methyl-4-oxo-4H-chromen-3-yl)-2-oxo-1,2-dihydropyridine-3,5-dicarbonitrile (4) with some α,γ-bifunctional electrophiles including 2-cyano-3,3-bis(methylthio)acrylonitrile, 2cyano-3,3-bis(methylthio)prop-2-enamide, 5-chloro-3-methyl-1-pheny...

The regional research is conducted on the mechanical properties and performance of loess in slop northern Shaanxi Province, China. On precondition conforming to related technical regulations, equipment was purchased or selfdesigned machined conduct large-scale in-situ direct shear test participatory a high slope Through multiple field tests red soils four-level platform side engineering tunnel,...

This document contains requirements for an interoperable public safety broadband communications nationwide network to serve all local, tribal, state, and federal first responder communications.

Under certain circumstances, the collision of magnetic monopoles, topologically locked-in regions of false vacuum, leads to topological inflation and the creation of baby universes. The future evolution of initial data represented by the two incoming monopoles may contain a timelike singularity but this need not be the case. We discuss the global structure of the spacetime associated with monop...

Analysis of low flow is one of the important considerations in any water resource project. Meanwhile, as a general idea it seems that flow control is more important than drought mitigation but it is necessary to pay more attention to drought problem in future projects. In this paper, available data for 28 selected watersheds were analyzed and then Flow Duration Curve was drew, and discharge of ...

A co-ordinated empirical European work (Project REPRESENTATION, MM 1045) has been led in six countries, with the aim of getting an insight of pupils’representations regarding ICT. A common protocol was defined. According to it, the pupils of one classroom in each country (fourth and fifth graders) were asked to draw a computer, to label its parts and to write short texts about computer uses. Re...