A pilot unit was constructed and operated to study the ability of treating polluted water
using biological treatment. The experimental unit consists of water sprayer unit that ensure
wetting of the filtered media and distributing water in a homogen
ous manner as well as
increasing the dissolved oxygen concentration in water. The sprayer unit is followed by a
biological filter; the area of the filtered media was (13) m2. The developed biological film
placed on the filtered media will dismantle the organic matter, which reduce nitrates to
nitrite then to a nitrogen gas. The filter was connected to an aeration basin where the
suspended growth was archived. The pilot unit was operated depending on the water was
taking from a manhole nearby the residential unit number 18. The average efficiency of
BOD5 removing was 69.4% and of nitrate, removing was 34%. The results showed that
this system can improve water's characteristics.
The aim of this work is the preparation of a biodegradable polymeric blend
(LDPE/AD+S) to be used for eco-friendly packaging purposes. The polymer matrix
consists mainly of low density polyethylene( LDPE), starch (S), and low quantities of
additiv
es (AD) as compatibilizers. The additives are: maleic acid, acetic acid, benzoyl
peroxide, and zinc stearate. The polymer blend LDPE/AD+S was prepared by extrusion, in
three compositions according to the percentage of starch (15,20,40%). Then, films were
prepared from the blend by thermal hydraulic compression to study their microstructure by
optical microscopic at magnification of 055 The results showed that the starch granules
were homogeneously distributed within the polymer matrix, and the compatibility
additives played an important role in enhancing the microstructure of the prepared blends.
The results also indicate that the starch promotes the onset of the bioegradation process.
this paper presents a solution of non-linear viscoelastic bar systems transversal vibrations
problems in presence of biological factor. Governing differential equations were built, then
analytical expressions of the solution of this equations were found, which describe
transversal vibrations of a thin finite length bar
The research was carried out during 2015 and 2016 seasons at Arab El-Mulk village,
Banias district, in Tartous Governorate, to study the effect of planting peanut seeds
size (mixture, small, medium and large), and spraying plants with bread yeast
(Saccaromyces serevisiae) concentration of (4%) in three treatments (control, once
and twice), on biological yield (BY), Economic yield (EY) and some physiological
indicators; yield index (YI), Harvest index (HI), crop index (CI) and seed index
(SI). The experiment design was set as split plot in a randomized complete block
with four replications. The seeds size considered the main factor, while spraying
yeast allocated the sub plots. The results showed that seed size caused significant
increases in all of the studied indicators. The large seeds gave better values of (BY)
210 g, (HI) 30.56%, (CI) 44.12%, (SI) 74.85 g, except (EY) compared with mix,
small and med seeds. Also the results showed that there were no significant increase
between mixture and medium seed size in (YE) and (HI), but there was a significant
increase in (BY) and (SI), on the other hand the treatments; spray yeast for once and
twice had significant increases compared to the control, and the twice yeast spraying
gave better values (215.22 g ,63.98 g, 29.64%, 42.37 % and 73.45g ) of (BY , EY
,HI, CI and SI) respectively, compared to the control. The interaction between seeds
size and bread yeast spraying caused a significant increase which achieved 15.78 %
in (BY), 23.99 % in (EY), 9.74 in (HI), 13.68% in (CY) and 7.87g in (SI) compared
to the interaction between untreated treatment and small seeds size.
The goal of the presented research in this paper is finding a unified way to solve cross vibration problems in nonlinear elastic fields with a biological factor. We obtained the equations of cross vibration for elastic systems by using known mathemat
ical models, and then we solved the nonlinear cross harmonic vibration problem for a finite length of effective bar.
The main goal of the presented research in this paper is to find a unified way to solve longitudinal vibration problems in nonlinear viscoelastic media with a biological factor and solve the problem in a bar of finite length.
The main goal of the presented research in this paper is to find a general way to solve longitudinal vibration problems. This way must solve these problems in nonlinear elastic bar systems with a biological factor.
We applied longitudinal vibration
equations in a nonlinear elastic bar with biological factor, the bar material was taken non-linear. and solve the problem in a bar of finite length.
