This research aims to detect the correlation between the meaning of life and rigidity psychological among a sample of Third-year
students from the University of Damascus - the colleges of education, architecture, economics, fine arts, where the numb
er of
members of the research sample (120) students, and tries to find the knowledge of the differences in the performance of individuals the research sample attributable to the variables of sex and jurisdiction, has been relying on the scale of the meaning of life for young people, which was prepared by Mohammed Hassan White (2010). The scale of hardness psychological preparation Mukhaimar (2002), and after testing the hypotheses was reached following results:
1 There is a strong positive correlation statistically significant at the 0.05 level between the Life Of Meaning and Psychological
Hardiness.
2 Enemy and there are statistically significant differences at the 0.05 level in the meaning of life and psychological Hardiness
depending on the variable sex.
3 Presence of statistically significant differences at the 0.05 level in the meaning of life according to the variable specialization for
students of the economy.
4 Presence of statistically significant differences at the 0.05 level of mental toughness in psychological Hardiness on the specialization for students of Fine Arts.
The research project sample consisted of 30 blocks of composite resin , these blocks where divided into three equal groups , 10 of composite resin Z-250 from 3M ESPE Company , 10 of the composite resin Supreme from 3M ESPE Company ,10 of the composit
e resin Quixfil of Dentsply company, and has been testing the hardness Number, each sample individually. The aim of the previous procedures was to show the role of composite resin structure in determining the hardness number Through differences in the hardness number and the role of this hardness determining the mechanical properties for composite resin restorations cause of the importance of this property to understand the mechanical properties for a lot of restorative materials. And the result is that there is a statistically significant between the resin Quixfil and the Z-250 on the one hand and the Supreme resin on the other hand.
We have studied in this paper the effect of thermal gaseous using NH3 – gas at some
diffusion layers properties of tool steel 20 in temperature range (550 ,650 ,750, 850) 0C ,
4h at each one . The purpose of this heat treatment is to get and determ
ine the microhardness,
fatigue and corrosion resistance.
The micro-hardness was determined using Vickers's tester with values ranged
between ( 130-435 ) HV.
In order to verify these results, we studied the microstructure if the surface layers
using metallurgical microscope and SEM (Scanning Electron Microscope). Furthermore
the corrosion resistance was studied after immersing it in sea water for two year.
since teeth whitening is very important procedure in dental office. the effect
of peroxides on enamel tissue is of great interest in research. The aim of this in vitro study was to perform
a qualitative analysis of the human enamel microhardness af
ter the application of high concentration of
hydrogen peroxide (38%)with and without light activation, using Vickers microhardness tests.
This study aimed to investigate curing efficiency of a second generation - light
emitting diode(LED) curing unit to polymerise two kinds of resin ,one depends upon camphorquinone as a
single photo initiator while the other uses co-initiator besides camphorquinone .
The influence of thermomechanical treatments on the microstructural properties of stainless steel D9 alloy
steel was studied.
Aluminum alloys have got extreme industrial importance since 19th century
until now. They enter into several light and heavy industries. aluminum is
hardened by impurity due to industrial application. In this study, aluminumcupper
alloys (with 0.5
% Mg) were prepared, where cupper amount was added
to aluminum in different percentages (2.5%,4%,4.5%) ,no overtaking degree of
saturation 6% of the weight of cupper. After adding definite percentage of
cupper to aluminum, the compounds are fusioned for complete blending, where
cupper atoms diffuse into aluminum. Samples are infusioned by definite
methods and circumstances. The prepared alloys were thermally treated during
8-30 hours for hardening. In this research we will concentrate on the influence
of cupper content on hardening of aluminum and other basic conditions, which
are needed to obtain higher hardness for aluminum alloys.
The current research aims to study the effect of chemical disinfectants
on the roughness and hardness of the surface of the cobalt chrome
alloy, where the use of cleansing Sodium hypochlorite 5.25%
and distilled water (the control sample), Been ma
nufacturing 20
structure metal of the alloy cobalt chrome, each group containing 10
samples and was doused with samples intravenously cleared, then it
was measured surface roughness using an Atomic force microscope, and
measuring the hardness of the surface using a Vickers measuring device
hardness.
In this research the effect of Nickel addition by various
percentages on the mechanical properties of
Aluminum-Copper alloy was studied. After
adding Nickel the alloys was artificially aged for different
times, and the effect of Nickel on
the re
sponse of alloy to precipitation hardening was studied.
Where the effect of Nickel on the microscope structure was
studied, and on the mechanical properties as hardness, tensile
strength, yield strength and elongation. The results showed that
the increase of Nickel improve this properties, where the highest
values were obtained when the Nickel's percentage was 5% Wt.
