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Search Results: 1 - 10 of 353 matches for " AGUS PURWANTO "
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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.

Inconsistency of Probability Density in Quantum Mechanics and Its Solution  [PDF]
Agus Purwanto, Eny Latifah, Bintoro Anang Subagyo
Open Journal of Microphysics (OJM) , 2012, DOI: 10.4236/ojm.2012.22002
Abstract: Probability density and particle conservation in quantum mechanics are discussed. The probability density has inconsistency with particle conservation in any quantum system. The inconsistency can be avoided by maintaining conservation of particle. The conservation coerces, a system should exist in a linear combinations of some eigenstates except ground state. The point is applied to the three exactly solvable quantum systems i.e. a particle in one dimensional well potential, harmonic oscillator and hydrogen atom.
Soy Germed Protein Plus Zn as an Inducer Insulin Secretion on Type-2 Diabetes Mellitus
HAYATI Journal of Biosciences , 2010,
Abstract: Hyperglicemic induces pancreatic cells to produce inadequate insulin. However, previous studies revealed that soy protein induce pancreatic cells to secrete insulin. Hence, this study was aimed to investigate effect of soy germed protein on the insulin and blood glucose level of type-2 diabetes mellitus with Zn enrichment. The research involved twenty four women that characterized with having more blood glucose level than normal, body mass index more than twenty three kg/m2, and age more than fourty years old. They were divided into three groups randomly, eight woman for each group. The first, second and third group were treated respectively with milk containing soy germed protein plus Zn, this product without Zn, and placebo, all for two months. Blood samples were taken at baseline, one and two months after observation. Results showed that two months after observation the insulin level increased from 194.79 to 519.82 pmol/ml (P = 0.033) in group consuming milk containing soy germed protein with or without Zn, supported by significantly reduced blood glucose level. This result might be correlated with the potency of isoflavones in soy germ protein to protect pancreatic beta cellsmembrane from free radicals attack. Therefore, this maintain the cells integrity and to secrete optimal insulin.
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.
Virgin Coconut Oil (VCO) Enriched with Zn as Immunostimulator for Vaginal Candidiasis Patient
HAYATI Journal of Biosciences , 2008,
Abstract: Disturbance on the immune system and deficiency of Zn is two factors which often trigger vaginal candidiasis patient. The aim of the research was to study the effect of virgin coconut oil (VCO) enriched with Zn to the amount of neutrophil and lymphocyte subset cells, and the level of IL-2 and IgG in vaginal candidiasis patient. Thirty women were grouped into three (ten women in each group): A, B and C, and intervened for two months. Women in A group were intervened with two tablespoon/day; those in B group were intervened with one tablespoon/day; while those in C group served as control (placebo). Blood was sampled at baseline time, one and two months after intervention. Hematological test by Micros-OT was done on a part of blood, and the plasma was used for IL-2 and IgG level tests using ELISA. The virgin coconut oil enriched with Zn maintained the number of neutrophil and NK cells, but increased Tc cells from 521 to 649 cells/mm3, increased Th cells from 1.090 to 1.380 cells/mm3. The enriched VCO also increase level of IL-2 from 0.25313 to 0.27337 pg/ml, while the IgG level changed from equivocal to negative. The recommended dosage was one tablespoon each day.
A Supplement Based on Zn-Enriched Virgin Coconut Oil as an Antifungal agent for Vaginal Candidiasis Patients
Microbiology Indonesia , 2008,
Abstract: This research was conducted to investigate the amount of Candida albicans in vaginal secretion of Vaginal Candidiasis patients administered with Zn-enriched virgin coconut oil. Thirty respondents were selected based on several criteria as follows: the number of C. albicans colonies in the vaginal secretion was more than 105 cfu.ml-1, voluntary, healthy, willing to sign the informed consent and resided in Purwokerto. In Group A, 10 women were administered 2 tablespoons per day of Zn-enriched virgin coconut oil. In Group B, 10 women were administered 1 tablespoon per day of Zn-enriched virgin coconut oil; and in Group C, 10 women served as control group. Vaginal secretions were taken 3 times, before intervention (at baseline time), at 1 month and 2 months after intervention. Samples were taken by collecting vaginal secretions from the vaginal proximal region using a sterile cotton bud, which was then put into a tube containing sterile carrier media. The vaginal secretions were tested for the number of total C. albicans using Pour Plate Method. Two months after treatment, the number of colonies decreased from 4.4x106 to 2.5x106 cfu ml-1 (p=0.03) in Group A. There was no significant difference in the number of colonies between Group A and Group B, the number of C. albicans colonies was still above the normal range. Therefore, the recommended dosage of intervention with Zn-enriched virgin coconut oil is one tablespoon a day.
Effect of Zn Supplemented to Immune Status Premenopausal Women Intervented with Isoflavoned Drinking
HAYATI Journal of Biosciences , 2005,
Abstract: The research was conducted to find out the effect of Zn supplement to immune status of premenopausal women intervented with isoflavoned drinking. Respondents were 22 women, more than 40 year of age. They were divided into two groups, i.e. 11 women intervented with isoflavone, and other 11 women intervented with isoflavone and 8 mg Zn. The activities of SOD, catalase and GPX were determined by spectrophotometer, thymulin levels by ELISA, whereas Zn levels by AAS. Result showed that Zn had significantly increased SOD lymphocyte activities (p=0.002) and thymulin plasma (p=0.011). Zn had increased catalase (p=0.103) and GPX (p=0.322) as well, but Zn plasma had decreased (0.163). It was indicated that Zn had improved the immune status by increasing lymphocyte and thymus cells activities.
Soy Germ Protein With or Without-Zn Improve Plasma Lipid Profile in Metabolic Syndrome Women
HAYATI Journal of Biosciences , 2012,
Abstract: The aim of this research was to determine the effect of soy germ protein on lipid profile of metabolic syndrome (MetS) patients. Respondents were 30 women with criteria, i.e. blood glucose level > normal, body mass index > 25 kg/m2, hypertriglyceridemia, low cholesterol-HDL level, 40-65 years old, living in Purwokerto, and signed the informed consent. The project was approved by the ethics committee of the Medical Faculty from Gadjah Mada University-Yogyakarta. Respondents were divided into three randomly chosen groups consisting of ten women each. The first, second, and third groups were treated, respectively, with milk enriched soy germ protein plus Zn, milk enriched soy germ protein (without Zn), and placebo for two months. Blood samples were taken at baseline, one and two months after observation. Two months after observation the groups consuming milk enriched with soy germ protein, both with or without Zn, had their level of cholesterol-total decrease from 215.8 to 180.2 mg/dl (P = 0.03), triglyceride from 240.2 to 162.5 mg/dl (P = 0.02), and LDL from 154.01 to 93.85 mg/dl (P = 0.03). In contrast, HDL increased from 38.91 to 49.49 mg/dl (P = 0.0008). In conclusion, soy germ protein can improve lipid profile, thus it can inhibit atherosclerosis incident.
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