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Search Results: 1 - 10 of 7187 matches for " MUHAMMAD AGUS SUPRAYUDI "
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Phospholipids Effect on Survival and Molting Synchronicity of Larvae Mud Crab Scylla serrata
HAYATI Journal of Biosciences , 2012,
Abstract: Effect of phospholipids on survival and molting synchronicity of mud crab larvae Scylla serrata were examined using Artemia enriched with five treatments of emulsion oil i.e. treatment with different level of soybean lecithin (SL) together with a level of DHA70G (referred to as DHA-SL0, 20 and 40) and treatment with SL and cuttle fish phospholipids (CPL) at 40 uL/L without DHA70G (referred to as WDHA-SL and WDHA-CPL). Survival rate, intermolt period, carapace width, and molting synchronicity were evaluated. Additionally, lipid classes and fatty acid composition of enriched Artemia were analyzed. Survival rate, intermolt period, and carapace width at the first crab (FC) stage of mud crab larvae fed DHA-SL0 to 40 were similar to that of WDHA-CPL but higher than that of WDHA-SL (P < 0.05). Moreover, mud crab larvae fed DHA-SL20, DHA-SL40, and WDHA-CPL had a significantly higher molting synchronicity index compared to that of larvae fed WDHA-SL and DHA-SL0. It can be concluded that combination of phospholipids and essential fatty acids exhibited an additive effect in improving molting synchronicity of mud crab larvae.
Cholesterol Effect on Survival and Development of Larval Mud Crab Scylla serrata
HAYATI Journal of Biosciences , 2012,
Abstract: The effect of cholesterol on the survival and development of larval mud crab Scylla serrata were examined by feeding larvae with Artemia enriched with different level of cholesterol. Artemia enriched with four stated levels of cholesterol i.e., 0, 5, 10, and 20 ul/l (Chol 0, 5, 10, and 20). All treatments were mixed with DHA70G at 25 ul/l. All the oil was adjusted to 100 ul/l by adding the oleic acid. Survival rate, intermolt period, and carapace width at the fisrt crab stage of mud crab larvae fed Chol 0, 5, and 10 were higher compared to that of Chol 20 (P < 0.05). We suggest that free sterol contained in Artemia at 1.37% was harmful to the growth performance of mud crab larvae. This study suggests that mud crab larvae required at least 0.61% cholesterol for maintaining good survival and development and therefore no need to enrich Artemia by cholesterol for the practical purpose.
Two Scenarios on the Relativistic Quantum Heat Engine  [PDF]
Agus Purwanto, Heru Sukamto, Bintoro Anang Subagyo, Muhammad Taufiqi
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.47144
Abstract: We compare two different scenarios at relativistic quantum heat engine by considering three-level energy, and two non-interacting fermion in one-dimensional potential well. The difference between the scenarios is about mechanism to get into excited state by two fermions. We apply iso-energetic cycle that consists of two iso-energetic and two iso-entropic processes, and then compute and compare the efficiency at both scenarios. We also compare it with non-relativistic case. The result is that one scenario has larger efficiency than the other that does not happen at non-relativistic case.
A Nonstandard Finite Difference Scheme for SIS Epidemic Model with Delay: Stability and Bifurcation Analysis  [PDF]
Agus Suryanto
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.36080
Abstract: A numerical scheme for a SIS epidemic model with a delay is constructed by applying a nonstandard finite difference (NSFD) method. The dynamics of the obtained discrete system is investigated. First we show that the discrete system has equilibria which are exactly the same as those of continuous model. By studying the distribution of the roots of the characteristics equations related to the linearized system, we can provide the stable regions in the appropriate parameter plane. It is shown that the conditions for those equilibria to be asymptotically stable are consistent with the continuous model for any size of numerical time-step. Furthermore, we also establish the existence of Neimark-Sacker bifurcation (also called Hopf bifurcation for map) which is controlled by the time delay. The analytical results are confirmed by some numerical simulations.
Multiple-State Quantum Carnot Engine  [PDF]
Eny Latifah, Agus Purwanto
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.211169
Abstract: A multiple-state quantum Carnot engine based on single particle in one dimensional potential well is evaluated. The general forms of adiabatic and isothermal force as well as work are given. We apply them first to the simplest case of two-state system, and then to three-state and general n-state system. The first isothermal expansion starts from single ground state and cease to single highest state. In Addition to the simplest case, isothermal expansions may terminate not to highest state but an intermediate state but with the same of the total expansion. The result is that the efficiency of the multi-state machine could be enhanced by reducing the volume of isothermal expansion for the same of the total volume expansion.
Quantum Heat Engines; Multiple-State 1D Box System  [PDF]
Eny Latifah, Agus Purwanto
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.48146

We evaluate quantum Otto, Diesel and Brayton cycles employing multiple-state 1D box system instead of ideal gas filled cylinder. The work and heat are extracted using the change in the expectation of Hamiltonian of the system which leads to the first law of thermodynamics to quantum system. The first law makes available to redefine the force which is in fact not well defined in a quantum mechanical system and then it is applied to define the quantum version of thermodynamic processes, i.e. isobaric, isovolume and adiabatic. As the results, the efficiency of quantum Otto engine depends only on the compression ratio and will be higher than the efficiency of quantum Diesel which can decrease by the widening of expansion under isobaric process. The efficiency of quantum Brayton engine may reach maximum on certain combination between the wide of box under isobaric expansion and compression, under certain conditions. The amount of levels participated in the quantum heat engine system will potentially reduce the performance of the quantum heat cycles consisting isobaric process, but it can be resisted using isobaric process controller.

Extra Dimensions Corrections for Fermionic Casimir Effect in Three Dimensional Box  [PDF]
Heru Sukamto, Agus Purwanto
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.45085

We want to show extra-dimensions corrections for Fermionic Casimir Effect. Firstly, we determined quantization fermion field in Three dimensional Box. Then we calculated the Casimir energy for massless fermionic field confined inside a three-dimensional rectangular box with one compact extra-dimension. We use the MIT bag model boundary condition for the confinement and M4 × S1 as the background spacetime. We use the direct mode summation method along with the Abel-Plana formula to compute the Casimir energy. We show analytically the extra-dimension corrections to the Fermionic Casimir effect to forward a new method of exploring the existence of the extra dimensions of the universe.

Agus Justianto
Jurnal Manajemen & Agribisnis , 2006,
Abstract: The objective of this study is to evaluatethe impact of selected forest policies on the incomes of the poor in East Kalimantan. A Social Accounting Matrix Approach of1995 and 2003 for Kalimantan Timur wasdeveloped to analyze linkages among socio-economic factors within the region,including poverty, income distribution, and economic development. Nine policyalternatives for the period 1995-2003 were then simulated using the Model toevaluate which would be most suitable for improving the income of the poor wholive in or near forest areas. Based on the comparison of economic performancein Kalimantan Timur before and after the decentralization era (1995 and 2003),the results indicate that the forest sector's contribution to the GDP of Kalimantan Timur decreased after the onset of thedecentralization era. The average disposable income of forest households in1995 and 2003 is the lowest of all household groups. By using poverty mapping,it was found that most of the population living in protection forests are poor,while that living in production forest areas and forest lands intended to beset aside for other purposes is relatively better off. Forestry activitieswhich had the most significant effect in generating income for poor people in Kalimantan Timur were small-scale forest industries ofvarious types. However, in general, forest households did not receive much inthe way of benefits from forestry activities and there is a very low multiplierof forestry sector activities for forest households. Small-scale forestindustries have provided a better income distribution to all groups of foresthouseholds, especially for the poor.
Agus Ristono
Jurnal Teknik Industri , 2006,
Abstract: In this paper, plant layouts is designed by considering the influence of the environment, i.e., the variability of demand. It also considers the new Total of Material Handling Cost (TMHC), which captures the inventory carrying costs. Moreover, the comparison between the distributed and the modular layout performance is presented. Those two types of layout are called as the next generation layout. It shows that the modular layout, which is done by using graph theory, i.e., modified Hamiltonian chain, gives flexibility as good as the distributed layout. Abstract in Bahasa Indonesia : Dalam makalah akan dipaparkan suatu rancangan tata letak yang memperhatikan pengaruh dari lingkungan berupa permintaan yang selalu berubah dari waktu ke waktu. Selain itu digunakan juga ukuran Ongkos Material Handling (OMH) yang baru dengan mengakomodasi ongkos simpan selama penanganan bahan. Selanjutnya diberikan juga perbandingan performansi antar tata letak generasi baru, yaitu tata letak terdistribusi dan tata letak modular. Hasil penelitian menunjukkan bahwa tata letak modular dengan menggunakan teori graph, yaitu rantai Hamilton yang dimodifikasi, dapat dikatakan sama fleksibelnya dengan tata letak terdistribusi. Kata kunci: tata letak terdistribusi, tata letak modular, Total Ongkos Material Handling (TOMH), tata letak generasi masa depan
Agus Mulyanto
Jurnal Informatika , 2013,
Abstract: Efektivitas berbagi pengetahuan merupakan perkara fundamental dalam organisasi. Berbagi pengetahuan tidak hanya dosen kepada mahasiswa tetapi juga kepada sesama kolega. Penelitian ini bertujuan untuk mengetahui persepsi dosen dalam berbagi pengetahuan. Dosen sebagai salah satu sumber daya internal Perguruan Tinggi, selain memiliki pengetahuan yang bersifat objektif, rasional, dan teknis berupa data ataupun dokumen (explicit knowledge), juga memiliki pengetahuan yang bersifat subjektif, kognitif, berbasis pengalaman (tacit knowledge). Dua ranah pengetahuan ini merupakan aset penting dalam organisasi yang harus dikomunikasikan antar individu/organisasi. Hal ini dimaksud agar proses berbagi pengetahuan (knowledge sharing) berjalan baik untuk mendukung berbagai keputusan. Penelitian ini menggunakan kuesioner online untuk mendapatkan data. Ada tujuh indikator untuk mengetahui persepsi dosen tentang berbagi pengetahuan, dan selanjutnya diekplorasi ke dalam 20 pernyataan. Skala likert digunakan untuk mengukur pernyataan tersebut. Hasil penelitian ini adalah dosen memiliki persepsi postif tehadap proses berbagi pengetahuan. Namun demikian dosen menjadi enggan berbagi pengetahuan ketika pengetahuan itu disalahgunakan dan dikomersialisasikan. Selain itu, model penyimpanan pengetahuan yang mudah dan terstruktur dipandang sebagai perkara penting dalam proses berbagi pengetahuan. Hal ini harus didukung dengan media/sarana yang memadai.
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