The effect of different concentrations of tween-20 combined with rice husk silica on the stability of o/w emulsion: A kinetic study

Emulsion is a thermodynamically unstable system which undergoes destabilization with time. The destabilization kinetics of "food grade" oil-in-water (O/W) emulsions in the presence of both tween-20 and rice husk silica as emulsifiers were studied. Rice husk silica concentration of 2.5% was combined with various concentrations of tween-20 from 0.1 to 1%. Oil phase fraction was 20% relative to the aqueous phase. Emulsification was conducted using a rotor-stator homogenizer at 20,000 rpm. The emulsions tended to destabilize with time. Their destabilization rates were studied using zero order and first order kinetic models. In general, the kinetics of O/W emulsion destabilization followed first order model. Different concentrations of tween-20 combined with rice husk silica influenced the destabilization rate of o/w emulsions. Destabilization rates of emulsions stabilized using mixed emulsifiers of 1% tween-20 and 2.5% silica were ~50 times and ~3 times lower compared to those stabilized using silica alone and tween-20 alone, respectively

Tank Model to See The Effect of Land Use Changes on Runoff, Infiltration and Groundwater in Sub

Water supply is closely related to geographical and climatic factors on the watershed area. Tank model is one of the hydrological models used to analyze the characteristics of river flow using the data of rainfall and climate. This study was aimed  to analyze the flow rate by using a tank model, which can describe the magnitude of hydrological processes, namely runoff rate, infiltration capacity, and ground water content in the sub-watershed of Konaweha. The study site was on the catchment area of ??the Wawotobi dam of Konawe Regency, South East Sulawesi Province, Indonesia. The study results showed that the conservation activity on the catchment area of the Wawotobi dam have a role in increasing the river flow rate and water infiltration into the soil. The pattern of land management that involves the conservation aspects resulted in a lower runoff or discharge rate, a greater value of infiltration and ground water content that can fill into a greater depth. In this case, the land use that takes into account the conservation aspects is very important in keeping the interval between maximum and minimum discharges or river flows, that is, not too big flow. This model of tank can also be used to predict the river flow at various watershed land uses on the sub-watershed area of Konaweha. Keywords: tank model, infiltration, watershed, conservation, rainfal

Desain instalasi pengolah limbah WC komunal masyarakat pinggir sungai desa Lingkar Kampus

Cangkurawok Village is located in the outer of the Bogor Agricultural University area and does not have good sanitation facilities. Disposal of domestic wastewater directly discharges into drainage channels to river. Wastewater treatment plant design from toilets communal divides into three stages. The first stage is determining the location of toilets communal and excreta treatment plant. Location provided by the public is around 5 meters above the surface of the river water. The second stage is the determination of service areas. In this village consists of 70 heads of households as the basic criteria for determining the volume of septic tanks. The last step is determining the design of toilets communal and wastewater treatment unit. This stage requires t he unit options that fits on the selected sites, based on ease of maintenance and no need employ trained operators. Waste treatment facility consists septic tank and infiltration well planning. Septic tank volume is 26.5 m3 with the long dimension of 2.75 m, width of 5.5 m and height of 1.5 m plus 0.3 meters for free board. Septic tank serving four toilets communal is built above it, with the division of space for two men and two spaces for women. infi lt rat ion well constructed to absorb the waste liquid vertically through the soil pores. Layers of sand and gravel is spread throughout the wells to assist the flow pattern. Depth and diameter of infiltration well are 3 m and 1 rn, This wells should be placed lower than the drinking water sources and wells, with a minimum distance of 15 m

Desain instalasi pengolah limbah WC komunal masyarakat pinggir sungai desa Lingkar Kampus

Cangkurawok Village is located in the outer of the Bogor Agricultural University area and does not have good sanitation facilities. Disposal of domestic wastewater directly discharges into drainage channels to river. Wastewater treatment plant design from toilets communal divides into three stages. The first stage is determining the location of toilets communal and excreta treatment plant. Location provided by the public is around 5 meters above the surface of the river water. The second stage is the determination of service areas. In this village consists of 70 heads of households as the basic criteria for determining the volume of septic tanks. The last step is determining the design of toilets communal and wastewater treatment unit. This stage requires t he unit options that fits on the selected sites, based on ease of maintenance and no need employ trained operators. Waste treatment facility consists septic tank and infiltration well planning. Septic tank volume is 26.5 m3 with the long dimension of 2.75 m, width of 5.5 m and height of 1.5 m plus 0.3 meters for free board. Septic tank serving four toilets communal is built above it, with the division of space for two men and two spaces for women. infi lt rat ion well constructed to absorb the waste liquid vertically through the soil pores. Layers of sand and gravel is spread throughout the wells to assist the flow pattern. Depth and diameter of infiltration well are 3 m and 1 rn, This wells should be placed lower than the drinking water sources and wells, with a minimum distance of 15 m

THE APPLICATION OF TRANSMITTER AND RECEIVER TO DETECT THE PLOUGHING DEPTH

Transmitter and receiver were applied in this research to detect the mole plough. Transmitter was placed outside the farm while receiver was attached on the mole plough construction and then pulled by tractor. Mole plough was used to create drainage channel. However, creating drainage channel at slope of 0,02% is a difficult task as mole ploughing depth is strongly affected by the contour of soil surface. The objective of this research was to design a device which had ability to control mole ploughing depth. Transmitter used a modified green laser beam which used to measure the profile of soil surface. Receiver was used to receive signal. Light receiver sensor used photodiode which formed into matrix sized of (1x8), every row consisted of 40 sensor of photodiode with 8 levels of depth. When transmitter was activated, green laser beam transmitted 1.206 Hz frequency and can be transmitted for maximum 50 m. When photodiode sensor received green laser beam at allowable detection range, the light beam was transmitted to Arduino microcontroller. There were two microcontrollers used to control two units of relay. The first microcontroller was used to detect the contour level of soil surfaceand second microcontroller was used to measure the mole ploughing depth. The research found that there was deviation of mole ploughing depth between setpoint and field testing result

Pengaruh pemberian bahan organik pada tanah liat dan lempung berliat terhadap kemampuan mengikat air

Amount of water that obtained soil depend on soil ability to quick absorp and continue water accepted from soil surface. Water holding capacity of soil are influenced by soil texture and organic matter. The purpose of th is research was to study soil water holding capacity on two textures of soils l.e. clay, and clay loam by organic matter application of chicken manure and compost. Those treatments were control, combined of chicken manure different texture soils, and combined of compost different texture soil. Chicken manure and compost application consisted of two levels of 30 9 5 kg-l soil texture and 50 9 5 kg-l soil texture, respectively. Soil texture consisted of two kinds l.e, clay, and clay loam. The research was analyzed according to descriftive method. Result of this research indicated that the highest available water capacity of 17.352 % was given by combined t reatment of 50 9 compost of 5 kg clay textured soils. The lowest evaporation rate had occur at clay texture soils

Pengaruh pemberian bahan organik pada tanah liat dan lempung berliat terhadap kemampuan mengikat air

Amount of water that obtained soil depend on soil ability to quick absorp and continue water accepted from soil surface. Water holding capacity of soil are influenced by soil texture and organic matter. The purpose of th is research was to study soil water holding capacity on two textures of soils l.e. clay, and clay loam by organic matter application of chicken manure and compost. Those treatments were control, combined of chicken manure different texture soils, and combined of compost different texture soil. Chicken manure and compost application consisted of two levels of 30 9 5 kg-l soil texture and 50 9 5 kg-l soil texture, respectively. Soil texture consisted of two kinds l.e, clay, and clay loam. The research was analyzed according to descriftive method. Result of this research indicated that the highest available water capacity of 17.352 % was given by combined t reatment of 50 9 compost of 5 kg clay textured soils. The lowest evaporation rate had occur at clay texture soils

Insights into the chemical composition of Equisetum hyemale by high resolution Raman imaging

Equisetaceae has been of research interest for decades, as it is one of the oldest living plant families, and also due to its high accumulation of silica up to 25% dry wt. Aspects of silica deposition, its association with other biomolecules, as well as the chemical composition of the outer strengthening tissue still remain unclear. These questions were addressed by using high resolution (<1 μm) Confocal Raman microscopy. Two-dimensional spectral maps were acquired on cross sections of Equisetum hyemale and Raman images calculated by integrating over the intensity of characteristic spectral regions. This enabled direct visualization of differences in chemical composition and extraction of average spectra from defined regions for detailed analyses, including principal component analysis (PCA) and basis analysis (partial least square fit based on model spectra). Accumulation of silica was imaged in the knobs and in a thin layer below the cuticula. In the spectrum extracted from the knob region as main contributions, a broad band below 500 cm−1 attributed to amorphous silica, and a band at 976 cm−1 assigned to silanol groups, were found. From this, we concluded that these protrusions were almost pure amorphous, hydrated silica. No silanol group vibration was detected in the silicified epidermal layer below and association with pectin and hemicelluloses indicated. Pectin and hemicelluloses (glucomannan) were found in high levels in the epidermal layer and in a clearly distinguished outer part of the hypodermal sterome fibers. The inner part of the two-layered cells revealed as almost pure cellulose, oriented parallel along the fiber