scholarly journals Stability and Volumetric Properties of Colored Asphalt Mixtures Containing Iron Oxide

2021 ◽  
Vol 24 (2) ◽  
pp. 130-136
Author(s):  
Samer Ali Naji ◽  
Alaa H. Abed
Keyword(s):  
Iron Oxide ◽  
The Other ◽  
Volumetric Properties ◽  
Oxide Content ◽  
Test Results ◽  
Other Hand ◽  
Marshall Test ◽  
The Stability ◽  
Limestone Dust ◽  
Marshall Stability

The objective of this paper is find the effect of using iron oxide as a filler on the Marshall stability, flow and the volumetric properties of HMA and compared the results with conventional HMA using limestone dust. Three blends were used: coarse, mid and fine with neat bitumen (AC 40-50). One aggregate type (crushed) with two types of fillers: limestone and iron oxide III (α- ) with three different filler content 6%, 8% and 10%. The Marshall mix design was conducted on the three blends and the optimum binder content is computed for each blend. The Marshall stability test results and the volumetric properties analysis showed that increasing the iron oxide content from 6% to 10%  increases the stability about 28%, 17% , 16% for the coarse , mid and fine mixtures respectively. This increment in stability of mixtures using iron oxide related to the increment in specific gravity of the mix (Gmb) by (1.3% to 1.5% about 30 to 50 kg/m3). On the other hand, the flow of mixtures is decreased about (5%) for mixes using iron oxide than the ones that used limestone as filler. The fine blend with 10% iron oxide exhibit the highest stability of 13.3 kN. While the coarse blend stability was 10 kN for the same filler type and content. Generally, the Marshall Test results of HMA using iron oxide as filler showed better resistance to plastic deformation, also produce denser HMA with higher stiffness. On the other hand, the volumetric properties analysis showed lesser values as compared with conventional mixture where the void in mineral aggregates and void filled with asphalt has decreased but within the acceptable limits.

Interpretation of 25-OH-D3, NEFA, and calcium correlations among cow and calf pairs

2025 ◽  
Vol 77 (04) ◽  
pp. 6511-2025
Author(s):  
SONGUL ERDOGAN ◽  
KEREM URAL ◽  
HASAN ERDOGAN ◽  
DENIZ ALIC URAL ◽  
MEHMET GULTEKIN ◽  
...  
Keyword(s):  
Energy Balance ◽  
Vitamin D3 ◽  
Colorimetric Method ◽  
Negative Energy ◽  
The Other ◽  
Negative Energy Balance ◽  
Test Results ◽  
Blood Samples ◽  
Other Hand ◽  
Cow Calf

In the present study, the aim was to determine alteration of NEFA, calcium and vitamin D3 levels in cow and calf pairs at parturition as well as correlation between each parameter levels. For this purpose, a cow-side device employing the enzymatic colorimetric method was used for measurement of NEFA and calcium levels. On the other hand, serum 25(OH)D3 analysis was performed using the fluorescence immunochromatographic method at the laboratory in the Faculty. Blood samples were taken from Vena jugularis of 15 Simmental cow and calf pairs immediately after parturition and placed in serum and heparinized tubes. In cow and calf pairs, concentration of vitamin D3 (15.6-120 and 31.8-120 ng/mL, respectively), NEFA (0.12-1.2 and 0.09-0.8 mmol/L, respectively) and calcium (1.8 ± 0.9 and 2.2 ± 0.6 mmol/L, respectively) were determined. There was no significant correlation between NEFA, Ca, and vitamin D3 in cows and calf pairs. Taking into account several co-factors that influenced test results, which could not easily be excluded, further studies may be warranted with larger cow-calf pair populations. In conclusion, vitamin D3 concentration in calves is not affected by the negative energy balance of dams in the parturition period.

Linear Stability of a Plasma Diode

1969 ◽  
Vol 24 (8) ◽  
pp. 1235-1243 ◽  
Author(s):  
M Dobrowolny ◽  
F Engelmann ◽  
A Sestero
Keyword(s):  
Boundary Conditions ◽  
Linear Stability ◽  
Plane Waves ◽  
The Other ◽  
Other Hand ◽  
Free Particles ◽  
Plasma Diode ◽  
The Stability

AbstractThe stability of a plasma diode with respect to longitudinal oscillations is investigated. If there are free particles emitted by the electrodes, the perturbations do not have the same dynamics as they would in an infinite plasma, contrary to the case where only particles trapped in the diode are present. This can be interpreted as due to a coupling of plane waves of different wave lengths, introduced by the boundary conditions at the electrodes. The occurrence of resonant-particle effects, on the other hand, is subjected to precisely the same conditions as in an infinite plasma.

On Wake-Induced Flutter of a Circular Conductor in the Wake of Another

1980 ◽  
Vol 102 (2) ◽  
pp. 125-137 ◽  
Author(s):  
Y. T. Tsui ◽  
C. C. Tsui
Keyword(s):  
Transmission Line ◽  
Coupling Coefficient ◽  
Frequency Ratio ◽  
Horizontal Axis ◽  
The Other ◽  
Two Dimensional ◽  
Coupling Ratio ◽  
Aeroelastic Stability ◽  
Other Hand ◽  
The Stability

This paper, which is an extension of [1], treats two-dimensional aeroelastic stability of two coupled conductors. It is found that the wake-induced flutter is symmetric with respect to the horizontal axis of the wake for all cases provided that the sign of the static coupling coefficient, ε = kxy/kxx, is changed. It appears that the spacer coupling ratio, K/kxx = Ω/ωx, is the most important factor in determining stability. For practical purposes, the system is almost always stable for K/kxx = Ω/ωx = 0.8, because the frequency ratio, κ = ωy/ωx, deviates less than ten percent from unity for a typical transmission line. On the other hand, within our range of interest, damping has little or no effect on the stability of coupled conductors. When the windward conductor is fixed, i.e., K = 0, then damping does influence the stability of the leeward conductor.

Isoprene and Rubber. XVIII. Viscosity Studies on Balata

1930 ◽  
Vol 3 (3) ◽  
pp. 516-518 ◽  
Author(s):  
H. Staudinger ◽  
E. O. Leupold
Keyword(s):  
Colloidal Particles ◽  
Colloidal Particle ◽  
Colloidal Solution ◽  
Elementary Particles ◽  
The Other ◽  
Colloidal Solutions ◽  
Specific Viscosity ◽  
Micellar Structure ◽  
Other Hand ◽  
The Stability

Abstract Varied views prevail as to the structure of the colloidal particles present in a rubber solution. According to Harries, Pummerer, and many others, these colloidal particles are formed through the association or aggregation of smaller molecules. According to Meyer and Mark they have a micellar structure, the micelles forming through the apposition of main valence chains. On the other hand, it was assumed by one of the present authors that the elementary particles in a colloidal solution of rubber are identical with the rubber molecules, these large, especially labile molecules being called macromolecules. Thus the existence of much larger molecules than any hitherto known was postulated. This view was confirmed by the conversion of rubber to hydro-rubber capable of forming colloidal solutions, and also by the pyrogenic decomposition of rubber. In order to decide definitely between the two conceptions, the stability of the colloidal particle in a rubber solution was studied by means of viscosity measurements at various temperatures as was done in the case of the polystyrols. If these colloidal particles form aggregates or if they have a micellar structure, they should decrease in size with increase in temperature, and this change should be evidenced by a diminution of the specific viscosity of the colloidal solution. On the other hand, if such a solution is composed of molecules, the specific viscosity at various temperatures is the same, provided that the molecules are not decomposed at higher temperatures. This line of research led to an explanation of the constitution of the colloidal particles in a polystyrol solution and was now applied to balata, since the latter is especially easily purified.

scholarly journals STUDIES ON OXIDATION AND REDUCTION BY PNEUMOCOCCUS

1924 ◽  
Vol 39 (5) ◽  
pp. 745-755 ◽  
Author(s):  
Oswald T. Avery ◽  
James M. Neill
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Oxygen ◽  
Hemolytic Activity ◽  
Active Agent ◽  
Organic Peroxide ◽  
Cell Extract ◽  
The Other ◽  
Cell Extracts ◽  
Other Hand ◽  
The Stability

In the present work on oxidation and reduction by sterile extracts of pneumococcus, the preparations employed contain among other constituents, a hemolytic substance the properties of which have been described by Cole (1, 2) in his studies on pneumococcus hemotoxin. Pneumococcus extracts prepared by the methods described are actively hemolytic, 0.005 cc. of extract causing complete lysis of 2.5 cc. of a 1 per cent suspension of red cells from rabbit blood. This hemolytic property of pneumococcus extracts is destroyed by 10 minutes exposure to 55°C. When pneumotoxin-containing extracts are protected from the action of molecular oxygen, their hemolytic activity remains unimpaired for considerable periods of time. In the presence of air, on the other hand, the stability of the hemolytic substance depends upon whether the particular type of extract contains a "complete" or "incomplete" oxidation-reduction system. Sterile broth extracts of unwashed pneumococci are reactive with molecular oxygen, and as a result of this union peroxide is formed whenever these extracts are exposed to air. The hemolytic activity of "complete" extracts of this type is rapidly decreased and finally destroyed in the presence of molecular oxygen. On the other hand, the "incomplete" type of extract prepared by saline extraction of washed pneumococci may be exposed to air with little or no loss of hemolytic power. This "incomplete" washed cell extract, unless reactivated, does not undergo autoxidation in the presence of air; under these circumstances peroxide is not formed and the hemolytic activity of this type of extract is not impaired by exposure to air. The stability of the hemolytic agent in the "incomplete" type of extract is evidence that this substance is itself not reactive with or affected by molecular oxygen, even in the presence of the cell enzymes. The destruction of the same hemolytic substance in extracts capable of undergoing autoxidation may be ascribed to the action of some peroxide formed by the union of molecular oxygen with easily oxidized or autoxidizable substances of the extract. It is now known that a peroxide, having the reactions of hydrogen peroxide, accumulates in sterile pneumococcus extracts during oxidation. It has been shown in the present study that the addition of preformed hydrogen peroxide destroys the hemolytic activity of pneumococcus extracts, although higher concentrations were required than were detected in oxidized extracts themselves. These facts and the known action of superoxides in analogous types of reaction make it seem not unlikely that the active agent in the destruction of pneumotoxin in oxidized cell extracts may be a peroxide; either hydrogen peroxide or some higher organic peroxide formed during autoxidation of the extract.

Improvement of Flange Tightening Method for Small Bore Low Rating Bolted Flanges

2010 ◽  
Author(s):  
Masako Mori ◽  
Akira Nebu ◽  
Takashi Kanno
Keyword(s):  
Axial Force ◽  
The Other ◽  
Test Results ◽  
Other Hand ◽  
Sealing Performance ◽  
Bolted Flange ◽  
Seating Surface ◽  
Spiral Wound

An appropriate flange tightening methods for small bore and low rating piping flange joints are clarified to improve the sealing performance of the bolted flange joints and the workability of flange tightening work. It is said that lubricant on the screw of the bolts and the nut-seating surface can minimize the variability of axial force acting on flange bolts, while this process might make it harder to tight the bolts uniformly especially for small bore low rating flanges. So, in this paper the appropriate condition to apply lubricant is clarified by a series of bolt tightening tests and sealing tests results. On the other hand, for the bolted flanges applying spiral wound gaskets, measuring the gasket compress dimensions help us to prevent uneven tightening balance and to perform the appropriate tightening work. Appropriate gasket compress dimensions are also clarified to ensure the sealing performance for the flanges based on the sealing tests results. Based on these test results, recommended flange-tightening methods have been summarized as an instruction and tightening work procedure to improve the sealing performance of the bolted flanges and the workability of flange tightening work.

scholarly journals PENGARUH GAYA KEPEMIMPINAN TERHADAP KINERJA KARYAWAN PADA LEMBAGA “BUMI DAMAI“ DESA KUWIRAN KECAMATAN KARE KABUPATEN MADIUN

2013 ◽  
Vol 1 (1) ◽  
Author(s):  
Ninik Srijani
Keyword(s):  
Data Collection ◽  
Statistical Methods ◽  
Leadership Style ◽  
Employee Performance ◽  
Positive Influence ◽  
T Test ◽  
The Other ◽  
Test Results ◽  
Other Hand ◽  
Regression Tests

<p>The purpose of this study was to influence of leadership style on employee performance in institution Bumi Damai Madiun. The sample in this study all existing employees in the institution Bumi Damai Madiun, totaling 34 people. Data collection using questionnaires. In analyzing the data used statistical methods to test the product moment correlation is valid whether or not the instruments used and the method of regression tests for testing the hypothesis put forward in this study. </p>The results showed that leadership style has relationships and a positive influence on the performance of employees at the Institute Bumi Damai Madiun. It is obtained from the correlation test that shows the value of rhitung is rtabel 0.339 0.740 whereas, on the other hand is 0.000 while the magnitude Sighit Sigprob 0.05. This means that the value rhitung ≥ rtabel (0.740 ≥ 0.339) or ≤ Sighit Sigprob (0.000 ≤ 0.05) meaning a rejection of H0 to show that leadership style has a relationship with employee performance on Institute <br /> Bumi Damai Madiun.  Further test results were also obtained Fisher, Fhitung value is 38.843 while the F table at 4.149, on the other hand is 0.000 while the magnitude Sighit Sigprob 0.05. This means that the value Fcount Ftabel ≥ (≥ 38.843 4.149) or ≤ Sighit Sigprob (0.000 ≤ 0.05) meaning a rejection of H0 which indicates that there is the influence of leadership style on the performance of employees at the Institute Bumi Damai Madiun. Besides t test results obtained, is 6.232 whereas tcount ttabel of 2.037, on the other hand is 0.000 while the value Sighit Sigprob 0.05. This means that tcount ≥ TTable (6.232 ≥ 1.694) or ≤ Sighit Sigprob (0.000 ≤ 0.05) meaning a rejection of H0 which shows that there are different leadership style influence on the performance of employees at the Institute Bumi Damai Madiun. R 2 of 0.548 results showed that 54.8% of employees affected by the performance variable leadership style, while the remaining 45.2% is influenced by other factors.

scholarly journals PENGARUH UPAH KERJA TERHADAP PRODUKTIVITAS KARYAWAN PADA HOME INDUSTRI JENANG "MILAH" DI KABUPATEN PONOROGO

2013 ◽  
Vol 1 (2) ◽  
Author(s):  
Safrida Riana Candra
Keyword(s):  
Data Collection ◽  
Positive Influence ◽  
Regression Testing ◽  
The Other ◽  
Employee Productivity ◽  
Test Results ◽  
Testing Method ◽  
Other Hand ◽  
Prevailing Wage ◽  
At Home

The purpose  of this study  was to determine  the prevailing  wage  in the home industry porridge  “MILAH”,    to determine  the productivity  of the employees  home industry porridge “MILAH”,    as well  as to determine  whether  or not the effect  of wages  on employee  productivity  at home industry  porridge "MILAH"  in Ponorogo.  The samples  in this  study  using  a sample  that  is saturated  all the  employees   home  industry  porridge “MILAH”, amounting  to 22 people.  Data collection  using documentation   and interview. In analyzing  the data used  for regression   testing  method  examines  the  hypothesis  proposed  in  this  study. The  results  showed  that  wages  have  relationships   and  a positive influence on employee  productivity  at home industry porridge  “MILAH”   in Ponorogo.  It is obtained  from the correlation  test showed  the value rhitung 0.867 whereas  rtable 0.423, on the other  hand  Sig(hit) is 0.000  while  the magnitude   Sig(prob) 0.05. This  means  that the value of rhitung &gt;= rtable (0.867 &gt;= 0.423) or Sig(hit) &lt;= Sig(prob) (0.000 &lt;= 0.05) meaning  a rejection  of H0 which shows  that wages  have a relationship  with  employee  productivity   at borne  industry  porridge  “MILAH”   in Ponorogo.  Further  test results  were also obtained  Fisher, Fhitung value is 60.542 while the value Ftable 4,351, on the other hand is Sig(hit) 0.000 while the magnitude   Sig(prob) 0.05. This  means  that the value  of Fhitung &gt;= Ftable (60.542&gt;= 4.351) or Sig(hit) Sig(prob) (0.000 d" 0.05) meaning  a rejection  of H0 which  indicates  that there are significant wage on employee productivity  at home industry porridge “MILAH”  in Ponorogo. Also  obtained  results  of the t test, thitung is 7,781 while ttable of 2,086, on the other hand Sig(hit) value  is 0.000  while  Sig(prob)  0.05.  this   means  that the value  of thitung &gt; ttable (7.781 &gt; 2.086)  or  Sighit&lt; Sigprob  (0.000  &lt; 0.05)  meaning  a rejection  of H, which  shows  that there are different  effects on the productivity   of the employee  wages at home industry  porridge "MILAH"   in Ponorogo.  Results  R2 of 0.752  indicates  that 75.20/0 of the variable  productivityof employeesaffectedbywagelabor,whiletheremaining24.8%isinfluencedby

scholarly journals RESEARCH ON SHEAR PERFORMANCE OF COMPONENTS CONNECTED BY BEECH AND SELF-TAPPING SCREW COMPOSITE DOWELS

Wood Research ◽  
2021 ◽  
Vol 66 (6) ◽  
pp. 955-968
Author(s):  
XUDONG ZHU ◽  
YINGYING XUE ◽  
XUEWEN ZHANG ◽  
PENGFEI QI ◽  
JIE SHEN ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Linear Equation ◽  
Failure Modes ◽  
Maximum Load ◽  
The Other ◽  
Test Results ◽  
Other Hand ◽  
Shear Performance ◽  
Group B ◽  
Better Than

This study examined the properties of components connected by beech and self-tapping screw composite dowels (group C). As a contrast, the components connected by beech dowels and self-tapping screws individually were tested. The test results indicated that the properties of the components connected by beech dowels (group B) were better than those connected by self-tapping screws (group S), except the ductility coefficient, final displacement, and energy consumption. On the other hand, the main failure modes of groups B and S were the broken beech dowel and the bent self-tapping screw, respectively. For group C, two peak values could be found which were larger than the maximum load of groups B and S, respectively. The properties of group C were better than those of groups B and S, except that the final displacement and energy consumption were located between those of groups B and S. Meanwhile, the linear equation in two unknowns have be found between groups B, S and C.

scholarly journals A comparative Study of Some Physical Fitness Component’s’ Test Results for Players Applying to The National Center for Gifted In Taekwondo, Wrestling and Boxing Aged 10 – 15 Years Old

2021 ◽  
Vol 33 (1) ◽  
pp. 33-44
Author(s):  
Amwaj Mohammed Ali
Keyword(s):  
Physical Fitness ◽  
Comparative Study ◽  
The Other ◽  
Test Results ◽  
Fitness Components ◽  
Explosive Strength ◽  
Other Hand ◽  
Physical Abilities ◽  
Descriptive Method

The research aimed at comparing some physical fitness components (stamina, explosive strength, transitional speed, agility, etc) in players applying for the national center of gifted in taekwondo, wrestling, and boxing aged (10 – 15) years old. The researcher used the descriptive method on (107) divided (26) for taekwondo, (43) for wrestling, (34) for boxing. The data was collected and treated using proper statistical operations to conclude that players applying for taekwondo, wrestling and judo had no significant differences. On the other hand, there are significant differences in stamina, transitional speed, and explosive strength. In general, athletes applying for boxing surpassed other athletes in all physical abilities.

Sign in / Sign up

Export Citation Format

Share Document