Optimasi Produksi pada PAD G-76 dengan Program Terintegrasi Sumur dan Jaringan Pipa Produksi

Pad G-76 terdapat 5 sumur gas didalamnya. Fluida dari sumur dialirkan menuju sistemreceiverHigh Pressure(HP)di permukaan, akan tetapi terdapat 2 sumur yang tidak bisa dialirkankarena mempunyai tekanan yang kurang untuk dapat memasuki sistem receiver HP sehinggatersisa 3 sumur yang aktif pada Pad G-76 ini.Sumur-sumur tersebut kemudian dioptimasikanproduksinya dengan menggantikan fasilitas produksi yang ada dalam Pad G-76 dengan sistemreceiver LP agar 2 sumur dapat tersebut diproduksikan kembalipembuatan model pada softwaredimana model tersebut di run kemudian dievaluasi dan dilakukan optimasi produksinya. Kemudiandilakukan analisa nodal mencari choke optimal dengan keadaan seperti model software yang telahdievaluasi.Dari model program sistem receiver LP yang telah dijalankan, dilihat bahwa sumur padaG-91 dapat diproduksikan.Sementara untuk sumur G-78 masih tidak dapat diproduksikan sehinggaditambah model kompresor GC200A. Pertambahan laju produksi setelah pergantian sistemreceiver adalah 5.04 MMSCFD. Sedangkan pertambahan produksi yang didapat dari pergantiansistem receiver dan kompresor adalah 5.12 MMSCFD.Choke optimal yang didapat dari setiapsumur yaitu adalah 56/64” (sumur G-76), 32/64” (sumur G-78), 52/64” (sumur G-89), 32/64” (sumurG-91), dan 48/64” (sumur G-92).Hasil pertambahan laju produksi optimasiproduksikeseluruhansebesar 9.76 MMSCFD

Deformation Projected RMF Calculation for Cr and Fe nuclei in Hybrid Derivative Coupling Model

The ground state properties of even mass Cr and Fe isotopes are studied using the generalized hybrid derivative coupling model. The energy surface of each isotope is plotted as a function of the mass quadrupole moment. The neutron numbers N=20 and N=40 are seen to remain magic numbers but N= 28 and 50 are predicted to be non-magic. The neutron number N=70 turns out to be a magic number according to the present calculation. In all the isotopes studied the calculated binding energy values are less than those obtained from experiment while the deformation is in better agreement.Comment: To appear in Int. Jour. Mod. Phys.

Median Road Revitalization as an Alternative Way to Overcome Flood on Jalan Asrama, Helvetia, Medan - Indonesia

Jalan Asrama, Helvetia Medan, is one of the areas in Medan that is often flooded. The puddle of water on Jalan Asrama, especially at the intersection of Gaperta Street, is already very alarming because the puddles that occur can reach heights of up to 0.5 meters so that it greatly disrupts traffic activity at that location. The cause is the inadequate condition of infrastructure facilities; one of the infrastructures referred to is the drainage and utilization of the Median Road that is not optimal. The purpose of this research is to find out the factors that cause flood inundation on the road bodies around Jalan Asrama-Medan following offer a solution by revitalizing the median Road as one way to overcome the flood. The research method used descriptive qualitative research methods. Namely by conducting research directly into the field and conducting library studies on various types of reading material related to the object of study in this study, among others in the form of books, journals, articles, and written works in the form of print media and internet media. This study concludes that the occurrence of inundation in the bodies of roads around Jalan Asrama, Helvetia, is caused by several factors. First, high rainfall, the two dimensions of drainage channels are not suitable in some parts; third is sedimentation and rubbish, which reduce the dimensions of the channel and inhibit the flow rate of water. Moreover, one solution that can be done is to revitalize the median of the road, which hopes can overcome the flood

Beta decay of 115-In to the first excited level of 115-Sn: Potential outcome for neutrino mass

Recent observation of beta decay of 115-In to the first excited level of 115-Sn with an extremely low Q_beta value (Q_beta ~ 1 keV) could be used to set a limit on neutrino mass. To give restriction potentially competitive with those extracted from experiments with 3-H (~2 eV) and 187-Re (~15 eV), atomic mass difference between 115-In and 115-Sn and energy of the first 115-Sn level should be remeasured with higher accuracy (possibly of the order of ~1 eV).Comment: 9 pages, 3 figures; talk at the NANP'05 Conferenc

Modified Bethe-Weizsacker mass formula with isotonic shift and new driplines

Nuclear masses are calculated using the modified Bethe-Weizsacker mass formula in which the isotonic shifts have been incorporated. The results are compared with the improved liquid drop model with isotonic shift. Mass excesses predicted by this method compares well with the microscopic-macroscopic model while being much more simple. The neutron and proton drip lines have been predicted using this modified Bethe-Weizsacker mass formula with isotonic shifts.Comment: 9 pages including 2 figure

Excitation energy of superdeformed bands in Relativistic Mean Field Theory

Constrained Relativistic Mean Field (RMF) calculations have been carried out to estimate excitation energies relative to the ground state for superdeformed bands in the mass regions A $\sim$ 190 and A $\sim$ 150. It is shown that RMF theory is able to successfully reproduce the recently measured superdeformed minima in Hg and Pb nuclei.Comment: 7 pages, LaTex, 3 p.s figures, Phys. Lett B. (to appear

The anatomy of the simplest Duflo-Zuker mass formula

The simplest version of the Duflo-Zuker mass model (due entirely to the late Jean Duflo) is described by following step by step the published computer code. The model contains six macroscopic monopole terms leading asymptotically to a Liquid Drop form, three microscopic terms supposed to mock configuration mixing (multipole) corrections to the monopole shell effects, and one term in charge of detecting deformed nuclei and calculating their masses. A careful analysis of the model suggests a program of future developments that includes a complementary approach to masses based on an independently determined monopole Hamiltonian, a better description of deformations and specific suggestions for the treatment of three body forces.Comment: 30 pages, 21 figures, extensives changes to improve presentation and clarity, with an ample discussion of the anomalous term. Accepted for publication in Nuclear Physics

Depleted Energy Charge and Increased Pulmonary Endothelial Permeability Induced by Mitochondrial Complex I inhibition are Mitigated by Coenzyme Q\u3csub\u3e1\u3c/sub\u3e in the Isolated Perfused Rat Lung

Mitochondrial dysfunction is associated with various forms of lung injury and disease that also involve alterations in pulmonary endothelial permeability, but the relationship, if any, between the two is not well understood. This question was addressed by perfusing isolated intact rat lung with a buffered physiological saline solution in the absence or presence of the mitochondrial complex I inhibitor rotenone (20 μM). Compared to control, rotenone depressed whole lung tissue ATP from 5.66±0.46 (SEM) to 2.34±0.15 µmol·g−1 dry lung, with concomitant increases in the ADP:ATP and AMP:ATP ratios. Rotenone also increased lung perfusate lactate (from 12.36±1.64 to 38.62±3.14 µmol·15 min−1 perfusion·g−1 dry lung) and the lactate:pyruvate ratio, but had no detectable impact on lung tissue GSH:GSSG redox status. The amphipathic quinone coenzyme Q1 (CoQ1; 50 μM) mitigated the impact of rotenone on the adenine nucleotide balance, wherein mitigation was blocked by NAD(P)H-quinone oxidoreductase 1 or mitochondrial complex III inhibitors. In separate studies, rotenone increased the pulmonary vascular endothelial filtration coefficient (Kf) from 0.043±0.010 to 0.156±0.037 ml·min−1·cm H2O−1·g−1 dry lung, and CoQ1 protected against the effect of rotenone on Kf. A second complex I inhibitor, piericidin A, qualitatively reproduced the impact of rotenone on Kf and the lactate:pyruvate ratio. Taken together, the observations imply that pulmonary endothelial barrier integrity depends on mitochondrial bioenergetics as reflected in lung tissue ATP levels and that compensatory activation of whole lung glycolysis cannot protect against pulmonary endothelial hyperpermeability in response to mitochondrial blockade. The study further suggests that low-molecular-weight amphipathic quinones may have therapeutic utility in protecting lung barrier function in mitochondrial insufficiency

Fission Cycling in Supernova Nucleosynthesis: Active-Sterile Neutrino Oscillations

We investigate nucleosynthesis in the supernovae post-core bounce neutrino-driven wind environment in the presence of active-sterile neutrino transformation. We consider active-sterile neutrino oscillations for a range of mixing parameters: vacuum mass-squared differences of 0.1 eV^2 < dm^2 < 100 eV^2, and vacuum mixing angles of sin^2(2 theta_v) > 10^-4. We find a consistent r-process pattern for a large range of mixing parameters that is in rough agreement with the halo star CS 22892-052 abundances and the pattern shape is determined by fission cycling. We find that the allowed region for the formation of the r-process peaks overlaps the LSND and NSBL (3+1) allowed region.Comment: 11 pages, 7 figures, Corrected Typo