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Search Results: 1 - 10 of 141 matches for " LUDI PARWADANI AJI "
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Shaking and Blending Effect on Microalgae Concentrates Size
LUDI PARWADANI AJI
HAYATI Journal of Biosciences , 2012,
Abstract: Microalgae concentrates (paste) can be used as an alternative feed to replace live microalgae for aquaculture due to its nutritional value and convenience. However, the clumping of cells and negative buoyancy of algae concentrate can affect bivalve culture as bivalves only capture particles in suspension and ingest a certain size range of particles. This study investigated the effect of shaking and blending treatments on the preparation of food suspensions prepared from algae concentrates (Isochrysis and Pavlova). The results indicated that the higher the shaking time (5, 10, and 15 times) or blending time (10, 30, and 60 seconds), the smaller was the diameter of the resulting algae particles. Moreover, the greater the volume of algae concentrate used in preparation, the larger the diameter of algae particles produced. Shaking may be the best option because it is cheaper and simpler. However, all the treatments provided a suitable particle size range for ingestion by bivalves.
THE USE OF ALGAE CONCENTRATES, DRIED ALGAE AND ALGAL SUBSTITUTES TO FEED BIVALVES
Ludi Parwadani Aji
Makara Seri Sains , 2011,
Abstract: Microalgae have high nutritional value and are used to feed adult and larval stages of bivalves, the larvae of some fish and crustaceans and zooplankton. However, microalgae production for aquaculture animal is very expensive. To overcome this, the use of preserved microalgae such as algae concentrate and dried algae, or algal substitutes has been developed. There are both advantages and disadvantages to this alternative food. For example, even though the cost production for algal substitute yeast-based diet is cheaper, their nutritional value is much lower compared to fresh microalgae. Moreover, there is no significant difference in nutritional value between preserved (concentrated or dried) and fresh microalgae; however, preserving microalgae for long periods will affect their nutritional value. In spite of this problem, preserved microalgae such as algal concentrate and dried algae seem to be more effective to feed bivalves than algal substitutes yeast based diet due to their availability and relatively high nutritional value. Furthermore, algae concentrates are more suitable to replace fresh algae than dried algae.
AN OVERVIEW OF THE METHOD, MANAGEMENT, PROBLEM AND THEIR SOLUTION IN THE PEARL OYSTER (Pinctada margaritifera) CULTURE
Ludi Parwadani Aji
Journal of Coastal Development , 2011,
Abstract: Pearl culture operations can be divided into three categories which are collection/hatchery production, ongrowing and pearl culture. For the hatchery, the pearl oyster industry relies on spat collection at natural production atolls where spat is abundant during the warm season and also from broodstock in the laboratory condition. After that, hatchery grown juveniles are put into the sea on the material which they settle upon. The spat are left to grow for 2 years till an average size of 90 mm. Pearl culture involves the implantation of a spherical nucleus together with a piece of mantle tissue (Saibo) from a sacrificial oyster, into the gonads. Although pearl culture is extensive with little control over weather, the use of good management methods can drastically increase productivity and result in higher profitability. Therefore, management of culture system such as site selection, settlement, feeding, stocking density and pearl culture technique is essential. For example, site selection is the most critical factor affecting pearl oyster productivity and spat collection, as the oysters spend most of their growing time exposed to water elements. Site selection must take into account important water quality parameters like temperature, salinity and turbidity. Moreover, it was identified several problems in pearl oyster culture including predation, disease and biofouling. They can result in massive loss in productivity. However, pearl industries have solution to deal with those problems. For instance, it can be done by cleaning mesh bag, biofouling organisms and pearl oyster regularly. For the future, the genetic approach like to create faster growing oysters, resistance to diseases and production of higher quality pearls has given promising results. Therefore, the productivity of pearl oyster can be improved.
ALTERNATIVE PRACTICE FROM COASTAL POND TO RECIRCULATION AQUACULTURE SYSTEM
Ludi Parwadani Aji
Journal of Coastal Development , 2012,
Abstract: Coastal pond aquaculture used solar energy to produce oxygen via phytoplankton with their cultivation can be extensive such as the culture of low value cultured animals. Pond encompasses a larger culture area for juvenile or grow-out culture which is depending on their carrying capacity of the pond. There is no feeding and the amount of food available depends on pond management which can be increased by manuring. As well as in hatcheries that require a very well environmental control, Recirculation aquaculture systems (RAS) tend to occupy a small area to culture high value species at high densities. The key parameter affecting RAS is the biological filtration system that removes metabolic and other waste products. This contains bacteria which break down the ammonia and nitrite in the water. Moreover, the food from RAS is supplied externally from cultured or formulated feed. Recirculation systems offer the advantage over pond aquaculture of being able to control the environment and water quality parameters to optimise fish health. For production of commodity food fish that are low in price, pond aquaculture is better than recirculation system due to their lower overheads and production cost as the environment acts as a natural water reconditioning system compared to money spent on water recirculation technology. In developing countries, pond will still remain dominant due to the ease of culture and the low initial investments. While, in developed countries, the growing concern about environmentally friendly discharges, the high labour costs and the need for controlling niche markets will result in the adoption of recirculation technology and the production of high value species at high densities. In comparison to pond culture, RAS offered more control and independent from the environment influence.
The operation and production in Penaeid farm
ludi parwadani aji
Journal of Tropical Life Science , 2011,
Abstract: Penaeid prawn demand in the world market has brought about a dramatic raise in the price of prawns, so, the aquaculture prawn industry also increase. Prawn farming can be divided by intensive, semi intensive or extensive culture system. Extensive culture system has low stocking densities, whereas, intensive culture (very high stocking densities) has highest level of environmental control such as recirculation system and stable ecological system. Predation and disease is the major obstacles in culture system. To deal with predation, farmers use net for covering the ponds and fencing the ponds. Disease organism such as parasites, bacteria, fungal and viruses may be eliminated through sterilization of the water. The commercial diets made from squid and white fish meal may replace fresh diet in semi-intensive culture as fish diet has a problem with preservation. Moreover, maintaining water quality such as dissolve oxygen, pH, nitrogen (ammonia and ammonium) and temperature is very important to support productivity and profitability in prawn farming. The most prominent aims at harvest are to pack the prawn in a way that avoids physical damage, minimize the quantity of prawn left on the bottom of pond, and directly chill prawn. Therefore, good management of water quality, feeding, disease, predation, and harvesting is important in prawn culture.
The operation and production of the barramundi, Lates calcarifer, at the Good Fortune Bay (GFB) Barramundi Farm Australia
Ludi Parwadani Aji
Journal of Tropical Life Science , 2012,
Abstract: Barramundi (Lates calcarifer) is a commercially important species in Australia and Southeast Asia. Barramundi are not difficult to accept artificial diets, resistant to disease and can grow faster in warm climates. System operation in Good Fortune Bay (GFB) Barramundi Farm in Kelso can be divided into nursery and grow-out management sections. The water source for nursery and grow-out is come from ground water with semi-recirculated system was applied. Every cage in the grow-out ponds has equipment with 4-wheel paddlewheel aeration. Aeration is eminent usually at night when the dissolve oxygen (DO) level in the ponds drop. To prevent predation and disease, each cage is covered by oyster tray lid and nursery tanks are always cleaned to remove pathogens. In the nursery, pellet is given to fish and the pellet size increase depends on the fish size, whereas, fish are feed by floating pellet for grow-out fish. Moreover, farmers measure water quality like DO every morning and also take water sample for ammonia, nitrite, nitrate analysis once a month. GFB Barramundi Farm just sells their product domestically and not import to other country since the price of barramundi from South East Asia such as Indonesia and Vietnam is much cheaper even the quality is lower than Australia product. This is because the labor and production cost in Australia is higher than South East Asia.
Temporal jurisdiction of international judicial and arbitral courts
aji? Sanja
Zbornik Matice Srpske za Drustvene Nauke , 2011, DOI: 10.2298/zmsdn1135011d
Abstract: Author explores different temporal aspects of jurisdiction of International Court of Justice, European Court for Human Rights and international investment arbitrations. Temporal limitations are two-fold: non-retroactivity of international acts, on one hand, and ratione temporis conditions for each and every international forum, on the other. Despite differences courts tend to conceptualize common elements across the borders of different jurisdictional rules. The rule of non-retroactivity will find its application before different fora, but discrepancies will emerge with respect to concepts of continuous and composite acts which potentially may overcome temporal limitations. This article explores intertemporal rule and non-retroactivity within the meaning of Article 28 of the Vienna Convention on the Law of Treaties and Articles 13-15 of ILC Articles on State Responsibility.
Adler-Bell-Jackiw anomaly in Weyl semi-metals: Application to Pyrochlore Iridates
Vivek Aji
Physics , 2011, DOI: 10.1103/PhysRevB.85.241101
Abstract: Weyl semimetals are three dimensional analogs of graphene where the energy of the excitations are a linear function of their momentum. Pyrochlore Iridates $(A_{2}Ir_{2}O_{7})$ with A =yttrium or lanthanide element) are conjectured to be examples of such a system, with the low energy physics described by twenty four Weyl nodes. An intriguing possibility is that these materials provide a physical realization of the Adler-Bell-Jackiw anomaly. In this letter we investigate the properties of pyrochlore iridates in an applied magnetic field. We find that the dispersion of the lowest landau level depends on the direction of the applied magnetic field. As a consequence the magneto-conductivity in an electric field, applied parallel to the magnetic field is highly anisotropic, providing a detectable signature of the semi-metallic state.
Application of Principal Component Regression with Dummy Variable in Statistical Downscaling to Forecast Rainfall  [PDF]
Sitti Sahriman, Anik Djuraidah, Aji Hamim Wigena
Open Journal of Statistics (OJS) , 2014, DOI: 10.4236/ojs.2014.49063
Abstract: Statistical downscaling (SD) analyzes relationship between local-scale response and global-scale predictors. The SD model can be used to forecast rainfall (local-scale) using global-scale precipitation from global circulation model output (GCM). The objectives of this research were to determine the time lag of GCM data and build SD model using PCR method with time lag of the GCM precipitation data. The observations of rainfall data in Indramayu were taken from 1979 to 2007 showing similar patterns with GCM data on 1st grid to 64th grid after time shift (time lag). The time lag was determined using the cross-correlation function. However, GCM data of 64 grids showed multicollinearity problem. This problem was solved by principal component regression (PCR), but the PCR model resulted heterogeneous errors. PCR model was modified to overcome the errors with adding dummy variables to the model. Dummy variables were determined based on partial least squares regression (PLSR). The PCR model with dummy variables improved the rainfall prediction. The SD model with lag-GCM predictors was also better than SD model without lag-GCM.
A Flight Simulator-Based Active Learning Environment  [PDF]
Chadia Affane Aji, M. Javed Khan
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.73016
Abstract:
The U.S. K-12 education continues to face two major challenges, the poor performance of students in math and science in comparison to other industrialized nations of the world and paucity of professional development on integrating technology in teaching for rural school teachers. While there certainly are structural reasons for this situation, pedagogical elements contrib-ute as well. Motivation and engagement in the classroom lead to deeper learning and academic success. The learning environment therefore should engage students affectively, behaviorally and cognitively. However, the design and implementation of a learning environment to engage and motivate students is a major aspect of the pedagogical challenge. Appropriate use of technology can support the design of such a learning environment. This paper provides details of an innovative technology-based learning environment to teach certain math and physics concepts to middle school students. Learning modules using an active-learning approach through the incorporation of flight simulation software were developed. The pedagogical approach was modeled in a teacher professional development workshop. An increase was observed in teaching efficacy and outcomes expectancy of the teachers who participated in the professional development. Post workshop data indicated the teachers’ acceptance of the effectiveness of the pedagogy and self-efficacy in using the approach.
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