scholarly journals PENGARUH TEMPERATUR AIR CAMPURAN TERHADAP KUAT TEKAN BETON

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Khairul Miswar
Keyword(s):  
Water Temperature ◽  
Key Words ◽  
Test Object ◽  
Concrete Mixture ◽  
Temperature Level ◽  
Water Factor ◽  
Degradation Ratio ◽  
Temperature Water

This research is to know effect of variation of semen water and the temperature toward pressure strength of concrete with a few temperature level that is normal temperature (24oC), 50oC, 75oC, and 100oC. Cemen water factor ( FAS) used 0,45 and 0,55. Test object at this research is selinder of concrete of standard with diameter 15 cm and high 30 cm amount to the this 24 sample. This research evaluate the slump mortar and pressure strength the concrete. Result of examination show that degradation ratio assess the maximum slump for the FAS 0,45 and FAS 0,55 are 80,64 % and 90,33 %. It is happened when concrete mixture with the water temperature is 100oC. Result of research also show that concrete mixture with the normal temperature water (24oC) pressure strength maximum is 33,83 MPa for the FAS 0,45 and 20,80 MPa for the FAS 0,55.Key words: cemen water factor, pressure strength, temperature, degradation ratio, slump

scholarly journals The Effect Of Seawater Use On Concrete Mixtures With Variations In Semen Water Factor

2020 ◽  
Vol 6 (2) ◽  
pp. 44
Author(s):  
Muh. Sayfullah S.
Keyword(s):  
Fresh Water ◽  
Test Object ◽  
Concrete Mixture ◽  
Fine Aggregate ◽  
Concrete Mixtures ◽  
Water Factor ◽  
The Press ◽  
Test Objects

The purpose in this study was to know the characteristic properties of fine aggregate materials and rough aggregates derived from Badene Village batauga sub-district as well as to know the strong press produced by concrete against seawater mixture with variations of cement water factor. In this study the material was mixed using laur water and fresh water with variations in cement water factor which is 0.45, 0.50, and 0.55. Testing is carried out at the age of concrete 3 days, 7 days and 28 days, using the dimensions of the slinder test object 15 cm x 30 cm. The total number of test objects is 54 pieces. The stronger the concrete press by using seawater as a concrete mixture can increase the strong press of concrete when compared to fresh water, as well as the smaller the value of the cement water factor used then the greater the strong value of the press. Strong press concrete with seawater mixture using cement water factor 0.55, 0.50, and 0.45 at age 28 days produce strong concrete presses respectively 15.82 MPa, 18.65 MPa, and 20.85 MPa, while strong concrete press with freshwater mixture using cement water factor 0.55, 0.50, and 0.45 at 28 days old produce strong concrete press 15.70 MPa respectively 18.40 MPa and 20.00 MPa. The results showed the influence of seawater use on concrete mixtures can increase the strength of the press compared to the use of concrete mixtures using fresh water.

scholarly journals Pengaruh Pemanfaatan Abu Tumbuhan Perumpung Terhadap Peningkatan Kuat Tekan Beton K300

Jurnal Tekno ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 11-20
Author(s):  
Ahmad Junaidi ◽  
R Dewo Hiraliyamaesa Hariyanto
Keyword(s):  
Compressive Strength ◽  
Test Object ◽  
Concrete Mixture ◽  
Wild Plant ◽  
Concrete Compressive Strength ◽  
Normal Concrete ◽  
Compressive Strength Of Concrete ◽  
Test Objects

Perumpung (Eulalia japonica) is a wild plant that usually grows on the banks of river. The locals consider this plant as a waste/pest, but the authors are interested in researching perumpung because they are similar to bamboo, sugarcane and other fibrous plants. In this study, the authors aims to compare the compressive strength of normal concrete with the compressive strength of concrete added with Perumpung ash at 28-days-old K-300. The study used a cube-shaped test object (15 x 15 x 15 cm) with 6 samples for each condition. The total number of test objects is 48, which consists of 8 conditions, namely normal conditions and 5%, 7.5%, 10%, 12.5%, 15%, 17.5% and 20% addition of perumpung ash by cement weight. The results obtained that the compressive strength of 28-days-old concrete under normal conditions was 316,060 kg/cm2 and the addition of 5% ash was 331.583 kg/cm2, 7.5% was 337.181 kg/cm2, 10% was 341.813 kg/cm2, 12 ,5% is 347,045 kg/cm2, 15% is 353,889 kg/cm2, 17.5% is 311,160 kg/cm2 and 20% is 298.44 kg/cm2. From the results above it can be concluded that the addition of 15% Perumpung Ash to the concrete mixture increases the maximum characteristic concrete compressive strength by 353.889 kg/cm2.

scholarly journals Macro benthic fauna in relation to limnological variables in a migratory bird visiting lake at Jahangirnagar University, Bangladesh

2018 ◽  
Vol 4 (2) ◽  
pp. 99-106
Author(s):  
S Sharmin ◽  
SH Rahman ◽  
MN Naser ◽  
S Hoque
Keyword(s):  
Water Temperature ◽  
Diversity Index ◽  
Winter Season ◽  
Benthic Fauna ◽  
Migratory Bird ◽  
Soil Parameters ◽  
Benthic Organisms ◽  
Wiener Diversity Index ◽  
Water Ph ◽  
Temperature Water

The abundance of macro benthic organisms was observed from a migratory bird visiting lake in Jahangirnagar University, Savar for a period from July 2016 to June 2017. A total of 22 species belonging to three phyla (viz. Mollusca, Annelida and Arthropoda) and 14 families was recorded with maximum abundance in summer season and minimum in winter season. Molluscan population (37%) was dominant in benthos, followed by Annelida (31%) and Arthropoda (28%). Average values of water temperature, dissolved oxygen and water pH were within standard permissible ranges in the aquatic habitats of the country. Water and soil parameters were in suitable ranges for the growth and abundance of benthos. Correlation indicated that Mollusca and Annelida were closely dependent on water temperature, water pH, water depth, soil organic carbon and soil organic matters, whereas Arthropoda had less dependency on them. In the present study lower Shanon-Wiener diversity index (2.55-2.92) and low species richness (18-24) clearly demonstrated that the lake is moderately polluted. J. Biodivers. Conserv. Bioresour. Manag. 2018, 4(2): 99-106

Effects on the Transparency of Corn Starch Dumpling Wrappers

2012 ◽  
Vol 554-556 ◽  
pp. 1049-1052
Author(s):  
Jun He Zhang ◽  
Guang Lei Li ◽  
Jie Zeng
Keyword(s):  
Water Temperature ◽  
Corn Starch ◽  
Design Method ◽  
Orthogonal Experimental Design ◽  
Water Addition ◽  
Range Analysis ◽  
Technical Parameters ◽  
Experimental Design Method ◽  
Dumpling Wrappers ◽  
Temperature Water

Effects of the water temperature, water addition, sucrose and the phosphate monoester starch on the transparency of corn starch dumpling wrappers were investigated by orthogonal experimental design method. Range analysis and variance analysis methods were carried out to analyse the test results. The results showed that the phosphate monoester starch significantly affected the transparency of corn starch dumpling wrappers (p=0.0414＜0.05), then followed by water temperature, water addition and sucrose in sequence. The optimal technical parameters of corn starch dumpling wrappers were as follows: water temperature 90°C, water addition100%, sucrose 1~1.5%, and phosphate monoester starch 7% (count as corn starch ).

Power Consumption Saving of Chiller Water System for Semiconductor Factory in Taiwan

2011 ◽  
Vol 314-316 ◽  
pp. 1492-1501
Author(s):  
Ching Liang Chen ◽  
Yung Chung Chang
Keyword(s):  
Power Consumption ◽  
Water Supply ◽  
Water Temperature ◽  
Cooling Tower ◽  
Reducing Power ◽  
Total Power ◽  
Water Cooling ◽  
Cooling Temperature ◽  
Total Power Consumption ◽  
Temperature Water

Recently, the semiconductor manufacturing industry has exhibited not only fast growth, but intense power consumption. Consequently, reducing power consumption is critical for running reliability. A view of literature reveals that the power consumption of facility system is 56.6 % in the fabs. Among all facility systems, chiller plants are the largest energy users, consuming 27.2 % of the total power consumption. Therefore, saving power consumption for chiller plants involves a considerable economic benefit. In addition, cooling the water temperature further improves the efficiency of chillers. Hence, this report analyzes the optimal temperature between the chiller and cooling tower. Currently, controlling the chiller and cooling tower are separate processes, though, in fact, they should not be. This is because the water cooling temperature affects the efficiency of the chiller. Each reduced degree of the chiller condenser temperature reduces the electrical power by approximately 2 % in the cooling tower, in contrast to the chiller. Therefore, the optimal water cooling water temperature must be analyzed. The analysis method in this report is linear regression. First, determine the equations of power consumption for the chiller and cooling tower with variables representing the water cooling temperature, water supply temperature of the chiller, and outdoor loading and wet-bulb temperatures. Second, add the coefficient of the same variable to obtain the total power consumption equation for the chiller and cooling tower. The result shows the relationships of power consumption with water cooling temperature under identical conditions of the water cooling temperature, water supply temperature of chiller, and outdoor loading and wet-bulb temperatures. Finally, use the differential method to determine the optimal water cooling temperature.

Precocious Sexual Development in Hatchery-Reared and Laboratory-Maintained Male Steelhead Trout (Salmo gairdneri)

1979 ◽  
Vol 36 (1) ◽  
pp. 90-93 ◽  
Author(s):  
Steven P. Schmidt ◽  
Edwin W. House
Keyword(s):  
Water Temperature ◽  
Key Words ◽  
Sexual Maturation ◽  
Sexual Development ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Juvenile Male ◽  
Precocious Males ◽  
Sexually Mature ◽  
Maturation Age

The incidence of precocious steelhead trout (Salmo gairdneri) was determined in several Idaho hatchery steelhead populations. The range of incidence of precocious males was 0–64% of the sampled populations. This variation appeared to be related to age of the trout, water temperature, and photoperiod. The incidence of precocious males greatly exceeded the incidence (0.1% of the population when encountered) of precocious females. Precocious male steelhead trout are apparently lost from the migrating smolt population and display mating behavior similar to sea-run adult male steelhead. Precocious males maintained in laboratory conditions remained sexually mature for at least 6 mo of observation. This was reflected by mean gonadal weights and mean gonadosomatic indices from precocious male steelhead which differed significantly from nonprecocious juvenile male steelhead maintained under similar conditions. No consistent pattern of growth was observed among laboratory-maintained trout. Key words: steelhead trout, reproduction, precocious sexual maturation, age, photoperiod, temperature

scholarly journals PENGARUH FAKTOR LINGKUNGAN TERHADAP KEBERADAAN GASTROPODA PADA EKOSISTEM MANGROVE DI DERMAGA LANTAMAL KELURAHAN KARANG INDAH DISTRIK MERAUKE KABUPATEN MERAUKE

2018 ◽  
pp. 33-48
Author(s):  
Rosiana Sari Mathius ◽  
Bonny Lantang ◽  
Modesta R. Maturbongs
Keyword(s):  
Environmental Factors ◽  
Data Collection ◽  
Water Temperature ◽  
Soil Ph ◽  
Field Data ◽  
Environmental Parameters ◽  
Mangrove Ecosystem ◽  
Field Data Collection ◽  
Water Ph ◽  
Temperature Water

This study aims to determine the type and effect of environmental factors on the presence of gastropods in the mangrove ecosystem. Field data collection is taken by measuring the environmental parameters directly, while gastropod data is obtained by calculating directly the amount obtained by each data collection. The results showed that in Lantamal Pier there were 8 species of gastropods : Littorina scabra, Cerithidea obtusa, Cassidula angulifera, Terebralia sulcata, Terebralia palustris, Ellobium aurisjudae, Telescopium-telescopium and Nerita lineata while environmental factors that affected to gastropods were water temperature, water pH, and soil pH.   Keywords: Gastropods; Environmental parameters.

scholarly journals Experimental and Numerical Study on the Effect of the Temperature-Control Curtain in Thermal Stratified Reservoirs

2019 ◽  
Vol 9 (24) ◽  
pp. 5354 ◽  
Author(s):  
Jijian Lian ◽  
Peiyao Li ◽  
Ye Yao ◽  
Wei He ◽  
Nan Shao
Keyword(s):  
Water Temperature ◽  
Temperature Control ◽  
Numerical Study ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Engineering Practice ◽  
Maximum Increase ◽  
Study Results ◽  
New Facility ◽  
Temperature Water

The impoundment and power generation of dams cause the temperature of released water much lower than the original rivers in the thermal stratified reservoirs. In addition, the released low-temperature water would damage the downstream habitats of fish and other biological groups seriously. Available facilities, such as stop log gate intakes and multi-level intakes, are built to alleviate the problem. For overcoming the limitations of traditional facilities on construction conditions and the improved effect of water temperature, a new facility of the temperature control curtain (TCC), with the advantages of convenient regulation and no hydropower loss, has been proposed recently. However, to the author’s knowledge, the theory of TCC is not abundant, with incomplete experimental tests and few numerical simulations. In this paper, a rectangular tank is designed specifically to conduct experimental tests to verify the effects of TCC and explore its potential impacts on released water temperature (RWT) under four major influencing factors. The study results show that TCC has significant effects on improving RWT, with a maximum increase of 8.3 °C. In addition, a three-dimensional hydrodynamic model with the same size of experimental model is established for further research. The results show that RWT is mainly related to the temperature distribution of a reservoir and the water-retaining proportion of the curtain. Finally, a basic principle for TCC construction is proposed and all these laid an important theory foundation for its application in engineering practice.

EXTREME DETERIORATION OF WATER QUALITY AND FISH SUFFOCATION PHENOMENA IN THE MARINE ESTUARY

2017 ◽  
Author(s):  
Kira Slepchuk ◽  
Kira Slepchuk ◽  
Tatyana Khmara ◽  
Tatyana Khmara ◽  
Ekaterina Mankovskaya ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Temperature ◽  
River Runoff ◽  
Small River ◽  
Fish Kill ◽  
Water Stratification ◽  
Temperature Water

The factors that provoke fish suffocation in an estuary, namely: natural (small river runoff, high air and water temperature, water stratification) and anthropogenic (regulation of river, etc.) were marked. Taking into account these factors the calculations were carried out and the possible areas of the Dnieper-Bug estuary, where fish kill of different scale and genesis is found out were identified.

Study on one Dimensional Numerical Simulation in Filling Stage of Water-Assisted Injection Molding

2011 ◽  
Vol 179-180 ◽  
pp. 1193-1198 ◽  
Author(s):  
Tang Qing Kuang
Keyword(s):  
Numerical Simulation ◽  
Injection Molding ◽  
Water Temperature ◽  
Water Pressure ◽  
Mold Temperature ◽  
Processing Parameters ◽  
Melt Temperature ◽  
Filling Stage ◽  
Short Shot ◽  
Temperature Water

Water assisted injection molding is a pretty novel way to fabricate hollow or more complicated parts. Its molding window and process control are more critical and difficult since additional processing parameters are involved. A simulation model for the filling stage of a pipe cavity during short-shot water assisted injection molding was proposed. The finite element/finite difference/control volume methods were adopted for the numerical simulation. A numerical study, based on the single factor method, was conducted to characterize the effect of different processing parameters on the short shot water-assisted injection-molding of thermoplastic composites, including short-shot size, melt temperature, mold temperature, water temperature and water pressure. For the factors selected in the simulations, short-shot size was found to be the principal parameters affecting the water penetration length while melt temperature, mold temperature, water temperature, water pressure were found to have little effect on the penetration of water.

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