Asphalt concrete is used in the surface layer of road paving and is widely used around the
world. Asphalt concrete consists of coarse aggregate , fine aggregate, filler and asphalt
binder. Fly ash FA is one of the main wastes of coal-fired thermal
and coal-fired power
plants and is available in large quantities and has no use. The aim of this study is to
evaluate the possibility of using fly ash as a filler material in hot asphalt mixtures and to
use it as an alternative to natural fillers by performing laboratory work in which the asphalt
mixture is designed and the optimal ratio of asphalt is determined . Then replace the filler
material with 0, 25, 50, 75 and 100% with fly ash . The results showed that Marshall's
stability values increased with increased replacement ratio and observed that Marshall's
hardness values were decreased while remaining within the tolerable limits of the
specifications. The study concluded that fly ash can be used as a filler in asphalt mixtures.
It is necessary when designing removable partial dentures to be fixed,
stable and well supported for improving patient comfort, and decreasing
damages on soft tissues and dental abutments, the alveolar ridge has a
strong influence in planning for
treatment and interpretations
biomechanical when treated with removable partial dentures, and have
four shapes in the sagittal plane which are horizontal shape, concave
shape, distal ascending shape and descending shape.
this study was conducted to compare the stability of the
lower denture in edentulous treated with traditional complete
dentures and dentures manufactured by silicon materials.
The present study describes a simple stability-indicating reversed-phase HPLC assay
for pentoxifylline in its pharmaceutical dosage forms. Separation of the drug and the
degradation products، under stress conditions was successfully achieved on a C
18 column
utilizing water: MeOH (60:40 v/v)، pumped at a flow rate of 1 ml min-1 with UV detection
at 272 nm. The retention time of pentoxifylline was about 14 min. The method was
satisfactorily validated with respect to linearity، precision، accuracy and selectivity. The
response was linear in the range of 0.6-3.5 μg/ml with R2 0.994. The method was accurate
(recovery 100.1%) and precise (RSD < 2%). Detection and quantification limit were 0.2
μg/ml and 0.4 μg/ml respectively. The suggested method was successfully applied for the
analysis of pentoxifylline in extended release tablets available in Syrian market.
تم استخدام العديد من الطرق لتحسين ثبات الزرعة مع ذلك توجد دلائل غير كافية لدعم العلاقة بين المعالجة بالليزر اللين وثبات الزرعة
Additive migration levels in food simulants from polymeric materials that
are intended to be into contact with food can be affected by additive stability
under the migration test conditions. In this work, the stability of Dibutyl
adipate (DBA), Di
isobutyl adipate(DIBA), Diisobutyl phthalate (DIBP), Di-noctyl
phthalate (DnOP),and Diethylhexyl sebacate (DEHS).,was studied in
aqueous food simulants A, B, C and ethanol 95% (as a substitute for olive oilwhich
is a fatty food simulant, simulant D), at different temperatures 20, 40 and
70 ºC, during 20 days. Samples were analyzed by high performance liquid
chromatography (HPLC) with UV detector at 270 nm. The stability of the
studied compounds appeared to be least of all in simulant B, then in simulant
A, and finally in simulant C., When temperature and exposure time increase.,
on the other hand, the increase in temperature and exposure time have greatly
less effect on the stability of plasticizers in ethanol %95,as a substitute for olive
oil-which is a fatty food simulant.
Additive migration levels in food simulants from polymeric materials that
are intended to be into contact with food can be affected by additive stability
under the migration test conditions. In this work, the stability of four
antioxidants: Butyle
ted hydroxy toluene (BHT), Bisphenol A (BPA),
Pentaerythritol tetrakis (3,5-di-tert-butyl-4-hydroxyhydrocinnamate) (Irganox
1010), and Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate
(Irganox 1076), was studied in aqueous food simulants A, B, C and ethanol 95%
(as a substitute for olive oil- which is a fatty food simulant- simulant D), at
different temperatures 20, 40 and 70 ºC, during 20 days. Samples were
analyzed by high performance liquid chromatography (HPLC) with UV
detector. In general, the studied compounds appeared to be more stable in both
Ethanol (95%) and simulant B than in simulants A and C.
Cephalometric superimpositions are the most commonly means used to assess
the orthodontic teeth movement – especially- in cases of extraction - with their attendant risks and
difficulty, therefore dental casts were an alternative way for serial ass
essment. So the aim was to evaluate
the stability of the medial end of the third palatal ruga as a landmark in maxilla in extraction cases, and
the possibility of using it in the mandible.
Additive migration levels in food simulants from polymeric materials that
are intended to be into contact with food can be affected by additive stability
under the migration test conditions. In this work, the stability of two
plasticizers: Diethyl
hexyl phthalate (DEHP) and Dibutyl phthalate (DBP) was
studies in aqueous food simulants A, B, C and ethanol 95% (as a substitute for
olive oil- which is a fatty food simulant- simulant D), at different temperatures
20, 40 and 70 C0, during 20 days. Samples were analyzed by high performance
liquid chromatography (HPLC) with UV detector.
In general, DEHP and DBP plasticizers appeared to be more stable in both
Ethanol (95%) and simulant C than in simulants A and B, while, they are less
stable, even at low temperatures, in Simulant B than in simulant A .
