This research presents an empirical study about the behavior of High Strength Concrete
beams under the static cyclic loading. It determines the influence of cyclic loading on the
moment capacity and deflection of HSC beams. A comparison of the mome
nt capacity and
deflection in both kinds of loading (monotonic and cyclic loading) were achieved.
High Strength Concrete mixture was designed, based on the specifications of the American
code ACI 211.4R-93. Thirty six concrete beams were prepared, nine of them were tested
under monotonic loading and the rest of beams were tested under cyclic loading. The
cyclic loading was performed for (5,10,15) cycles, at a range from zero to 65%, 75%, 85%
of the minimum expected monotonic load.
The results showed that the cyclic loading have positive effect on the flexural behavior of
HSC members, whereas the moment capacity increased and the deflection decreased,
especially at a range from zero to 75% of the minimum expected monotonic load, when
the number of cycles was 5,10,15.
This research presents an empirical relationship between modulus
of elasticity with compressive strength concrete that is prepeard
from localized materials and containing several perecentages of
natural pozzolan (0 ,10 ,15, 20)% , also for tow cem
ent quantity
(350 ,400 ) Kg/m3 and for tow ages(28 ,90 ) day .Then comparing
the experimentally obtained result with the mechanical properties
calculated using the recommend relationship from the various
design codes. A new empirical relationship between elastic
modulus, and compressive strength for concrete containing natural
pozzolan is proposed.
Two hundred and thirty-six E. coli isolates n=236 were collected. Antibiotic susceptibility and ESBL production were studied by disc diffusion and DDST (double disk synergy tests) according to Clinical Laboratory Standards Institute guidelines (CLSI)
and EUCAST for ESBL.
75 (32%)of total isolates demonstrated MDR (multi drug resistance),62 of resistant bacteria (26% of total) were determined as ESBL producers.
In conclusion, we recommend adding this standard, cheap ESBL detection method to the routine microbial susceptibility tests run in Syrian hospitals in order to determine and isolate the sources of MDR infections and do some effort to contain and eliminate those strains.
Using high strength concrete made a big step in designing and
constructing reinforced concrete structures. In this research, shear
resistance of high strength concrete beams with average resistance
of (65Mpa) and without shear reinforcement was ca
lculated by
making Experimental tests, also we studied the effect of cross
section shape on shear resistance, and measured the deflection in the
middle of the beams then we compared these results with the
mathematical results and with results from other researchers, finally
we developed a relationship to determine shear capacity in high
strength concrete T beams.
The purpose of this research to control LED Lamps lightintensitydependent ofoutside
light intensity using electronic board Arduino Uno. control LED lamps analog voltage
achieved by pulse width modulation (PWM) digitally, studying LDR sensorspecific
ation,
designing light meter after founding the relationship between light dependent resistance
and light intensity measured by Lux,constructing a program using Arduino IDE for
microcontroller onArduino Uno that will maintain the desired light intensity selected.
Testing finally all the circuits after it has been completed circuit design and data are
collected. proving that it is possible to maintain the desired intensity of light and calculated
the average power consumption taking into consideration heat loss of LED lamps for 12
hours for tow values of light intensities 200,300 lux with outside light intensity and heights
1m and 1.5 m.It found that when the outside light intensity increases thecurrent intensityis
decreasing through LED lamps automatically and reduce power consumption. Thus, it can
be concluded using this board that it conserves energy.
This study aimed to compare the effects of different enamel
etching techniques for bracket bonding strength. The sample
consisted of eighty human premolars were randomly divided into
four equal groups. The enamel surfaces of the teeth were etched
with 35% orthophosphoric acid in Group 1 , air abraded with
50 μm aluminum oxide prior to acid etching in Group 2, Trans
bond Plus Self-etching Primer (TPSEP) in Group 3 , Er: YAG
laser in Group 4. After enamel etching procedures, brackets were
bonded with Trans bond XT , then shear bonding test was
performed using a testing machine (Tinius Olsen).
The study was conducted to evaluate the efficiency of Pseudomonas chlororaphis MA342,
Serratia plymuthica HRO-C48K, Bacillus subtillis B2g, B. subtillis FZB27 to induce systemic
resistance in Tomato plants against Cucumber mosaic virus (CMV) under
greenhouse conditions.
Tomato seeds submerged in suspension of Pseudomonas chlororaphis MA342, Serratia
plymuthica HRO-C48, Bacillus subtillis B2g and B. subtillis FZB27 9×109cfu . plants emerged
from these seed were inoculated with CMV after 10 days of planting. The time of beginning
symptoms was recorded, Disease incidence, disease severity, area under disease progress curve
AUDPC, progress of infection disease degrees during the study period were calculated using
virtual symptoms . pyroxidas enzyme activity was determined, Some growth parameters such as
Plant height, foliage fresh weight, root fresh weight , foliage dry weight, root dry weight were
observed after 30 DAI. Results of this study showed that seed treatment with Pseudomonas
chlororaphis MA342, Serratia .plymuthica HRO-C48, Bacillus subtillis B2g, B. subtillis FZB27
significantly decreased the diseases incidence on treated and inculated plants which ranged
between 40% - 66.66% ,compared with un treated and inculated control 93.33% Without the
presence of significant differences between the bacterial treatments. significantly decreased the
diseases severity on treated plants which ranged between 45.53 %- 62.2% compared with inculated
and un treated control 88.86% .Without the presence of significant differences between the
bacterial treatments. Peroxidas activity on treated plants increased by Compared with untreated
plants. Seed treatments with bacteria significantly increased the plant growth. The plant height ,
fresh and dry weight of foliage, fresh and dry weight of root on treated plants were significantly
higher than those of inculated and un-treated plants according to LSD 5%.where bacteria reduced
the rate of stunting and the rate of decline mild and dry weight of foliage and mild and dry weight
of the root occurring due to infection with the Cucumber mosaic virus (CMV).
Syrian Steeps has formed the most important ecosystem in
Syria ,in particular on both side , biodiversity vegetation and
wildlife. Despite of this fact, the structure of communities have
been changed by many effects ,thus Syrian steeps has lost it
s
balance .This study aimed to analysis the impact of topography
on characteristics of communities , We found 38% of variance
return back to elevation and landscape ,specially between the
low sites ( often Depression , valleys and Terraces ) and the
high sites (often summit of mountains and plains).
According to the Syrian standard 3411 & European standard EN 197-1, Portland
pozzolana cements and Portland limestone cements can be produced by partial replacement
of pozzolan or limestone up to 35%. Despite of the economical, ecological and techn
ical
benefits of adding natural pozzolan and limestone powder, they are often associated with
shortcomings.
The objective of the study is to investigate the effect of adding natural pozzolan,
limestone powder or both on the mechanical strength development of the prepared cement
mortars. In the study, sixteen types of binders (one OPC, six binary and nine ternary
blended cements) with different replacement levels of natural pozzolan, limestone powder
or both have been produced. The development of the compressive and flexural tensile
strength of all mortar specimens has been investigated after 2,7,28 & 90 days curing,
respectively.
Test results revealed that there was a decrease in strength with increasing amounts of
natural pozzolan. In addition, there was found an increase in the early age strength with
adding limestone powder. The increase in compressive strength when adding both natural
pozzolan and limestone powder has also been noted. Further, based on the results obtained,
an empirical equation was derived to predict the mechanical strengths of binary & ternary
blended cement mortars with curing times. The influence of adding natural pozzolan,
limestone powder or both on some physical properties of binary and ternary blended
cements have been reported, as well.
The determination of sludge characteristics of wastewater treatment process has the
primary role in the treatment and disposal. This research aims to determine the sludge
characteristics by studying specific resistance factor of the sludge on the f
iltration at Merge
Maarban station, so we took samples of sludge from the station and made several
laboratory experiments and we got the time of intensify sludge, moisture and The
concentration of the solid substances. we calculated specific resistance factor values of the
sludge when the moisture values are ( 97.5 , 95.5 , 94 , 92 , 91 , 88 ) %. The research
results showed a decrease in resistivity factor value of sludge on the filtration as its
moisture become less and the sludge drying time takes tow weeks.
