First-year computer science (CS1) university students traditionally have difficulties understanding how to program. This paper describes research introducing CS1 programming concepts using a Scratch language guided visual execution environment (VEE). The addressed are those from an introductory course (sequences, variables, operators, conditionals, loops, and events parallelism). VEE guides nov...

The visibility in the Sichuan Basin (SB) was worse than that North China Plain (NCP) for same level of PM2.5. One well-known reason is aerosol extinction enhancement due to hygroscopic growth SB stronger NCP because relative humidity (RH) higher NCP. However, under PM2.5 and RH levels. volume efficiency (VEE) kept between 7 8 different SB, while VEE increased from 4.6 7.2 when 20 180 μg/m3 diff...

In this paper, the wear resistance and antifriction of epsilon phase layer and diffusion layer of gas nitrided D2 steel and M2 steel have been studied. The changes m wear mechanism of epsilon phase under the load from 20N to 200N are analysed. When the load is lighter than 100N, it is mainly oxidizing wear on friction surface. The adhesion, peeling off and abrasive wear appear on friction surfa...

In this paper, we will provide a simple method for starting with a given finite frame for an $n$-dimensional Hilbert space $mathcal{H}_n$ with nonzero elements and producing a frame which is $epsilon$-nearly Parseval and $epsilon$-nearly unit norm. Also, the concept of the $epsilon$-nearly equal frame operators for two given frames is presented. Moreover, we characterize all bounded invertible ...

A model for the enhancement of the primary humoral immune response of rhesus monkeys to marginal or weakly antigenic vaccines is presented. Our procedure used the complexing of formalin-inactivated Venezuelan equine encephalomyelitis (VEE) virus vaccine with specific, homologous, immune gamma globulin (IgG) at equivalence. Equivalence was determined by combining the concentrated, isotopically l...

The antibiotic pyrazofurin, 3-(beta-D-ribofuranosyl)-4-hydroxypyrazole-5-carboxamide, markedly inhibited the in vitro replication of a number of RNA viruses including Rift Valley fever (RVF), Venezuelan equine encephalomyelitis (VEE), Sandfly, Pichinde, Lassa and LCM virus. Plaque formation was reduced by 80% or more with 2-10 micrograms/ml of pyrazofurin while 2 micrograms/ml reduced by 1000-f...

This paper studies some existence results for generalized epsilon-vector equilibrium problems and generalized epsilon-vector variational inequalities. The existence results for solutions are derived by using the celebrated KKM theorem. The results achieved in this paper generalize and improve the works of many authors in references.

Abstract In this paper we reconsider a known technique for constructing strong MIP formulations disjunctive constraints of the form $$x \in \bigcup _{i=1}^m P_i$$ x ? ? i = 1 m </mml:...

The concept mapping and the Vee diagram are important tools for improving the level of conceptual learning of mathematics in all educational levels that can play an important role in the learner's achievement. The purpose of this study is to use a concept mapping and Vee diagram, to calculate the volume of an object by the integral, includes the reaction of what a teacher really knows, the way ...