On the subdivision strategy in adaptive quadrature algorithms

AbstractThe subdivision procedure used in most available adaptive quadrature codes is a simple bisection of the chosen interval. Thus the interval is divided in two equally sized parts. In this paper we present a subdivision strategy which gives three nonequally sized parts. The subdivision points are found using only available information. The strategy has been implemented in the QUADPACK code DQAG and tested using the “performance profile” testing technique. We present test results showing a significant reduction in the number of function evaluations compared to the standard bisection procedure on most test families of integrands

Electrowinning of Zinc by Mercury Cathode

The problem was the investigation of electrowinning of zinc by using a mercury cathode, employing a neutral solution of zinc sulphate and containing small amounts of zinc, in the order of ten grams zinc per liter and less. The purpose of this study was on the base of the laboratory experiments to investigate the operational data that might possibly be applied in practice or industry

Determinants of Choice of Storage Systems for Root and Tuber Crops in Benue State, Nigeria

Determinants of Choice of Storage Systems for root and tuber crops in Benue State of Nigeria were examined. The specific objectives were to determine the factors affecting choice of storage systems by root and tuber crop farmers; and determine the relationship between choice of storage systems and farm productivity. Data were collected from 288 root and tuber crop producers in eight Local Government Areas and 32 wards, using a multi-stage sampling technique. Structured questionnaire was used to collect the data. Data collected were analysed using logit model and Mann-Whiney U test. The results indicate that total output, gender, educational level, household size, and farm size significantly affect the choice of storage systems by root and tuber crop producers. The results also reveal that the output of farmers who utilized only the local storage systems exceeds those who utilized both the local storage systems in addition to the modern storage techniques. It was recommended that strategies and policies aimed at encouraging root and tuber crops farmers to adopt a particular storage technique should take into consideration their socio-economic characteristics. Also research efforts aimed at improving the effectiveness of the local storage systems using locally sourced materials should be encouraged

Phytoremediation Potential of SENNA OCCIDENTALIS to remove Heavy metals from waste soil in Makurdi, Nigeria

This paper is aim to investigate the capacity of plant (Senna occidentalis) to remove contaminant in waste soil polluted by various heavy metals. The phytoextraction of Cd, Cu, Ni, Pb, Zn from waste dumpsite using Link plant (Senna occidentalis) was investigated under natural phytoextraction (NPE), chelant-assisted phytoextraction (CPE), Poultry manure-assisted phytoextraction (PMPE). Link plants were grown for 8 weeks in soils receiving: no treatment/amendments as NPE, citric acid (0.05 - 2.0 mmol) and EDTA (0.05 - 2.0 mmol) amendments as CPE, Poultry Manure (2.0 - 10.0 % w/w) as PMPE. Post-harvest roots and shoots biomass (g) were 51.29 and 93.33 for NPE, (EDTA) ranged from 23.58 - 39.36 and 66.78 - 83.14, MPE ranged from 49.95 - 87.75 and 95.14 - 170.18. The percentage metal extractability in the various scenario followed the order, NPE; Ni > Cd > Zn > Cu > Pb, CPE (EDTA): Zn > Pb> Cd> Ni > Cu, The BCF and TF was calculated for tissue metal concentrations, NPE showed that BCF for all metals were < 1, TF for Cd (1.10) and Ni (2.59) were > 1 while Cu, Pb and Zn were < 1. EDTA CPE showed that BCF for all metals at all level of treatments were < 1 while the TF were > 1 for Cd (1.23, 1.20, 1.54 and 1.11) Cd (1.30 and 1.07) and Zn( 2.33 and 1.91) while Ni and Pb were all  <1. In general, S.occidentalis was capable of taking up all the Heavy metals under study, accumulating and adequately translocating them to the aboveground harvestable biomass provided the necessary soil amendment is done. Keywords: Example (S.occidentalis, Phytorediation, Heavy metal and Natural Phytoextraction) DOI: 10.7176/CMR/11-4-05 Publication date: April 30th 2019

SB7-21/22: Resolution Establishing ASUM\u27s Demands Regarding COVID-19 Vaccine Requirement

SB7-21/22: Resolution Establishing ASUM\u27s Demands Regarding COVID-19 Vaccine Requirement. This resolution passed on a 16Y-2N-0A vote during the September 8, 2021 meeting of the Associated Students of the University of Montana (ASUM)

Calculation of the Coherent Synchrotron Radiation Impedance from a Wiggler

Most studies of Coherent Synchrotron Radiation (CSR) have only considered the radiation from independent dipole magnets. However, in the damping rings of future linear colliders, a large fraction of the radiation power will be emitted in damping wigglers. In this paper, the longitudinal wakefield and impedance due to CSR in a wiggler are derived in the limit of a large wiggler parameter $K$. After an appropriate scaling, the results can be expressed in terms of universal functions, which are independent of $K$. Analytical asymptotic results are obtained for the wakefield in the limit of large and small distances, and for the impedance in the limit of small and high frequencies.Comment: 10 pages, 8 figure

Patterns of use, perceived benefits and reported effects of access to navigation support systems: an inter-European field operational test

The study presents findings regarding drivers’ patterns of use, attitude towards, and reported effects of access to mature nomadic navigation support systems. Three different systems were tested by 582 drivers in four-field operational tests for a period of six months. A majority of the participants used the support system for trips where the route/destination was unfamiliar but there were also other use scenarios. The main benefits entailed convenience and comfort. Reported effects involved increased possibilities to choose the route according to preferences; a decrease in the time it took to reach destinations and in the distance covered to reach the destination. One in four reported a decrease in fuel consumption attributed an increased compliance with speed limits and/or that driving around and searching for the correct route to reach the desired destination could be avoided. A majority reported ‘no change’ regarding the number of journeys made by car. Reported effects (whether increases or decreases) were however smaller than expected before the trial