To provide the first nationwide reconnaissance of the occurrence of pharmaceuticals, hormones, and other organic wastewater contaminants (OWCs) in water resources, the U.S. Geological Survey used five newly developed analytical methods to measure concentrations of 95 OWCs in water samples from a network of 139 streams across 30 states during 1999 and 2000. The selection of sampling sites was bi...

In this work, the critical diameter for detonation was measured for Nitromethane (NM) sensitized with two different amines: Diethylenetriamine (DETA) and Triethylamine (TEA). The critical diameter in glass and polyvinylchloride tubes is found to decrease rapidly as the amount of sensitizer is increased, then increase past a critical amount of sensitizer. Thus the critical diameter reaches a min...

It IS well known about the principle of popping at spring loaded safety valves. It is also essential that the valves should operate surely judging by their purposes. In this study, operating tests have been carried out systematically using a safety valve, which belongs to lift type for air service and has a nominal size of 1 inch. In the beginning, we focussed on coiled spring whicl1 is one of ...

0.1. Let X be a smooth compact complex curve, M be a holonomic D-module on X (so outside a finite subset T ⊂ X , our M is a vector bundle with a connection ∇). Denote by dR(M) the algebraic de Rham complex of M placed in degrees [−1, 0]; this is a complex of sheaves on the Zariski topology XZar. Its analytic counterpart dR(M) is a complex of sheaves on the classical topology Xcl. Viewed as an o...

In this paper we consider the formally symmetric differential expression M[·] of any order (odd or even) ≥ 2. We characterise the dimension of the quotient space D(T max)/D(T min) associated with M[·] in terms of the behaviour of the determinants det r,s∈N n [[ f r g s ](∞)] where 1 ≤ n ≤ (order of the expression +1); here [ f g](∞) = lim x→∞ [ f g](x), where [ f g](x) is the sesquilinear form ...

While there is a growing interest in infusing engineering into elementary classrooms, very little is known about how well positioned elementary teachers are to teach engineering. This study examined elementary teachers’ perceptions of and familiarity with design, engineering, and technology (DET). We collected data from 192 elementary teachers using the DET teacher survey. While these elementar...

The present paper provides an enumeration of leguminous taxa of Balaghat Ranges of Maharashtra along with their habits, phenological deta and voucher specimen numbers. During the present work, a total of 123 species, 4 subspecies and 17 varieties of Fabaceae have been recorded for Balaghat Ranges of Maharashtra, of which 119 taxa are occurring in wild while 25 are under cultivation. The members...

In the theory of random matrices for unitary ensembles associated with Hermitian matrices,m−point correlation functions play an important role. We show that they possess a useful variational principle. Let μ be a measure with support in the real line, and Kn be the nth reproducing kernel for the associated orthonormal polynomials. We prove that for m ≥ 1, det [Kn (μ, xi, xj)]1≤1,j≤m = m! sup P ...

of Public Health highlights two special papers addressing environmental exposures along the border shared by Mexico and the United States of America. In one paper, Bass et al. (1) examine the use and storage of pesticides in households with young children in Douglas, a small Arizona border community; these pesticide practices reflect the risks as perceived by the Douglas residents. In the secon...

Tick-borne zoonoses are considered as emerging diseases. Tick repellents represent an effective tool for reducing the risk of tick bite and pathogens transmission. Previous work demonstrated the repellent activity of the phenylpropanoid eugenol against Ixodes ricinus; here we investigate the relationship between molecular structure and repellency in a group of substances related to that compoun...