Nitriding is a surface treatment technique used to introduce nitrogen into metallic materials to improve their surface hardness, mechanical properties, wear resistance and corrosion resistance. In this research, the effects of plasma nitriding parameters including frequency and duty cycle were investigated on samples with different grooves dimensions. Steel blocks prepared from DIN1.2344 hot wo...

INTRODUCTION The Erection Hardness Score (EHS), recently validated, was developed in 1998 as a simple (one-item) method to quantify erection outcome data. Although it is intuitive that erection hardness and successful sexual intercourse (SSI) are related, the link has not been directly established. OBJECTIVE To evaluate the relationship between erection hardness (assessed by EHS) and SSI, est...

We describe constructions of several cryptographic primitives, including hash functions, public key cryptosystems, pseudo-random bit generators, and digital signatures, whose security depends on the assumed worst-case or average-case hardness of problems involving lattices.

Freshwater molluscs are important components of the fauna of Singapore. However, a perusal of local literature has shown a paucity of information on these animals. A survey was conducted to investigate the occurrence and distribution of the primary (non-brackish) freshwater molluscs of Singapore. Six different types of habitats were sampled from around the island. Four localities were chosen to...

Consider a graph G = (V, E) and a coloring c of vertices with colors from [l]. A vertex v is said to be happy with respect to c if c(v) = c(u) for all neighbors u of v. Further, an edge (u, v) is happy if c(u) = c(v). Given a partial coloring c of V, the Maximum Happy Vertex (Edge) problem asks for a total coloring of V extending c to all vertices of V that maximises the number of happy vertice...

This study focused upon the determination of physicochemical and microbial properties, including metals, selected anions and coliform bacteria in drinking water samples from hand-dug wells in the Kumasi metropolis of the Republic of Ghana. The purpose was to assess the quality of water from these sources. Ten different water samples were taken from different parts of Kumasi, the capital of the ...

The current study focuses on these physico-chemical characteristics of Ghodha pachad reservoir, which is located in Madhya Pradesh's Bhopal District. For a period one year, seasonal fluctuations various physical and chemical parameters, including air temperature, water pH, dissolved oxygen, TDS, total hardness, chlorides, phosphate, nitrate etc, were examined (Nov 2020-Oct 2021). All physicoche...

Characteristics of mosquito larval habitats are important in determining whether they can survive and successfully complete their developmental stages. Therefore, data on the ecological factors affecting mosquito density and abundance especially the physicochemical properties of water of their breeding sites, can possibly be helpful in implementing larval management programs. Mosquito larvae we...