Detection Some Trace Elements in Human Milk and Effect of Some Factors on its Concentrations

Study aim to determination some trace elements in lactating mothers human milk and study effect different factors on its concentration, Age , Body mass index, Home and Smoking habitat, atomic absorption flame less used to measured (Mn, Cd, Co and Zn) in 70 sample of lactating mothers milk which digested using tricolor acetic acid 24%. Result show that concentration of these elements increasing than normal value of these elements,Mn was 1801.40, Cd was 114.64, Co was 288.52 and Zn was 212.10.Also factors were studied effect on minerals concentration,  increasing age was  non effected on minerals concentration, over weight causes increasing it, urban resident causesincreasing in Mn concentration while rural residence causes increasing in others minerals, negative smoking habitat causes increasing in Cd and Co concentrations. Key words: trace element, lactating mother’s human milk, atomic absorptio

THERMAL CHARACTERISTICS OF PHASE CHANGE MATERIAL USED AS THERMAL STORAGE SYSTEM BY USING SOLAR ENERGY

In this paper, the melting processes of phase change material in a shell and tube heat exchanger by using solar thermal energy have been investigated numerically and experimentally. All experimental were outdoor tested at AL-Mussaib city-Babylon-Iraq (Lat 32.5 º North, and long 44.3 º East) with N-S collector direction at tilt angle of 32.5 º with the horizontal. The phase change material used in this work is black color Iraqi origin pure Paraffin with amount of 12 kg. In the experimental setup evacuted tube solar collector is employed for melting phase change material in shell regime. Different volume flow rates for the water flow inside the inner tube of heat exchanger namely (200, 300, and 500 LPH) for Reynolds number namely (15000, 23000, 38000) respectively were used for each season from August 2016 to January 2017. The numerical investigation involves a three dimension numerical solution of model by a commercial package ANSYS FLUENT 15.0. The boundary conditions of the model that solved by the numerical solution have been taken from the experimental tests. The experimental results indicated that the inner tube inlet and ambient temperatures has a significant effects on the melting process compared with the volume flow rates. Studying phase change material temperature distribution, it is exposed that a melting temperature of the phase change material in summer season needed time of (3-4) hours only, while it needed more time; (14-16) hours in winter season. Increasing solar radiation and ambient temperature reduces the melting time of phase change material. Increasing water temperature difference of inner tube increased the heat gained for phase change material. The results obtained from numerical solution presented the static temperature contours and showed that the temperature distribution of phase change material give good validations with experimental results with percentage deviation of 2.7%. The present experimental results have been compared with the previous studies and give a good agreement with increasing for present work of 25.9 %

Patricia Douglas Interview, December 20, 1976

Patricia Douglas offers her definition of what the University of Montana is and what a liberal arts education is. She details the University’s main sources of funding, and explains why the Montana University System made its largest funding request, as of 1976, due to inflation. Douglas summarizes trends in enrollment at the University and clarifies why forecasting enrollment is difficult to predict. She emphasizes the University’s importance in her life, and the opportunities that she feels the institution presents to young Montanans and non-traditional students. Douglas details her role as Assistant to the President, and her work with President Bowers communicating with Montanans about how the University could serve them.https://scholarworks.umt.edu/umhistory_interviews/1024/thumbnail.jp