Analytical Solution of Time-Fractional Advection Dispersion Equation

In this paper, we get exact solution of the time-fractional advection-dispersion equation with reaction term, where the Caputo fractional derivative is considered of order α ϵ (0,2]. The solution is achieved by using a function transform, Fourier and Laplace transforms to get the formulas of the fundamental solution, which are expressed explicitly in terms of Fox’s H-function by making use of the relationship between Fourier and Mellin transforms. As special cases the exact solutions of time-fractional diffusion and wave equations are also obtained, and the solutions of the integer order equations are mentioned

Optical Properties of Organometallic Perovskite: An ab initio Study using Relativistic GW Correction and Bethe-Salpeter Equation

In the development of highly efficient photovoltaic cells, solid perovskite systems have demonstrated unprecedented promise, with the figure of merit exceeding nineteen percent of efficiency. In this paper, we investigate the optical and vibrational properties of organometallic cubic perovskite CH3NH3PbI3 using first-principles calculations. For accurate theoretical description, we go beyond conventional density functional theory (DFT), and calculated optical conductivity using relativist quasi-particle (GW) correction. Incorporating these many-body effects, we further solve Bethe-Salpeter equations (BSE) for excitons, and found enhanced optical conductivity near the gap edge. Due to the presence of organic methylammonium cations near the center of the perovskite cell, the system is sensitive to low energy vibrational modes. We estimate the phonon modes of CH3NH3PbI3 using small displacement approach, and further calculate the infrared absorption (IR) spectra. Qualitatively, our calculations of low-energy phonon frequencies are in good agreement with our terahertz measurements. Therefore, for both energy scales (around 2 eV and 0-20 meV), our calculations reveal the importance of many-body effects and their contributions to the desirable optical properties in the cubic organometallic perovskites system.Comment: 5 pages, 4 figure

A model for time-dependent cosmological constant and its consistency with the present Friedmann universe

We use a model where the cosmological term can be related to the chiral gauge anomaly of a possible quantum scenario of the initial evolution of the universe. We show that this term is compatible with the Friedmann behavior of the present universe.Comment: 5 pages, Revtex 4, twocolumn (minor corrections and improved reference list. To appear in Classical and Quantum Gravity

The orbit of the star S2 around SgrA* from VLT and Keck data

Two recent papers (Ghez et al. 2008, Gillessen et al. 2009) have estimated the mass of and the distance to the massive black hole in the center of the Milky Way using stellar orbits. The two astrometric data sets are independent and yielded consistent results, even though the measured positions do not match when simply overplotting the two sets. In this letter we show that the two sets can be brought to excellent agreement with each other when allowing for a small offset in the definition of the reference frame of the two data sets. The required offsets in the coordinates and velocities of the origin of the reference frames are consistent with the uncertainties given in Ghez et al. (2008). The so combined data set allows for a moderate improvement of the statistical errors of mass of and distance to Sgr A*, but the overall accuracies of these numbers are dominated by systematic errors and the long-term calibration of the reference frame. We obtain R0 = 8.28 +- 0.15(stat) +- 0.29(sys) kpc and M(MBH) = 4.30 +- 0.20(stat) +- 0.30(sys) x 10^6 Msun as best estimates from a multi-star fit.Comment: submitted to ApJ

Evaluation of civil flight deck design using fuzzy logic approach

A good ergonomic design for cockpit can greatly help to improve pilots’ task efficiency and reduce potential human errors, hence increasing safety of flight operations. The ergonomics aspect should be more emphasized nowadays as the cockpit system moves towards more flight automation, particularly regarding the human-machine interactions. In this study, the main objective is to highlight whether there is potential improvement for current cockpit system design. The evaluation process is done using fuzzy logic pattern recognition approach and three evaluation objects have been chosen, which are instrument panel, pedestal panel and pilot's seat. 14 experts are involved in evaluating these objects through a survey that has been distributed to them. 10 evaluation criteria are established for the study and cockpit designs of two existing aircraft series are used in the example case study. All in all, the results highlight that there exists some rooms for improvement for the current cockpit design that should be considered in the future to enhance its efficiency

Pengembangan Model Peningkatan Daya Saing Gula Merah Untuk Memperkuat Ekonomi Masyarakat Pedesaan

Penelitian ini bertujuan untuk merumuskan model peningkatan daya saing gula merah sebagai upaya memperkuat ekonomi masyarakat pedesaan. Untuk mencapai tujuan penelitian digunakan metode PRA, FGD, RRA, indept interview dan survei. Sampel ditentukan melalui stratified random sampling sebanyak 150 orang. Teknik analisis data secara kuantitatif dan kualitatif. Analisis kuantitatif menggunakan DRCR dan PCR. Analisis kualitatif adalah fenomenologis dan pola kecenderungan yang dilakukan sepanjang rentang waktu penelitian. Penelitian dilakukan di dua kecamatan penghasil gula merah di Kabupaten Jember sejak bulan Pebruari 2016 sampai Juni 2016. Hasil penelitian pada agroindustri rumah tangga gula merah di Kabupaten Jember menunjukkan: (1) Keuntungan per 25 pohon/bulan sistem kemitraan Rp 1.014.575, sistem non mitra sebesar Rp 301.408 (skala kecil), Rp 668.113 (menengah) dan Rp 691.369 (besar); (2) pendapatan USAha gula merah/bulan sistem kemitraan Rp 4.426.688, sistem non mitra sebesar Rp 2.545.469 (skala kecil), Rp 3.467.260 (menengah) dan Rp 4.355.938 (besar), dengan kontribusi terhadap pendapatan total keluarga sebesar 94,36% pada sistem kemitraan, dan non mitra 85,83% (skala kecil), 90,52% (menengah) dan 93,36% (besar); (3) Daya saing kompetitif termasuk dalam kategori rendah (nilai PCR mitra= 0,84; non mitra skala menengah =0,92; besar = 0,90) bahkan skala kecil non mitra masuk dalam kategori sangat rendah (PCR =1,031); (4) Daya saing komparatif baik sistem kemitraan maupun non mitra termasuk dalam kategori sedang (nilai DRCR mitra = 0,65; non mitra skala kecil= 0,72; menengah= 0,70; besar= 0,67)

Eosinophilia in a patient with cyclical vomiting: a case report

BACKGROUND: Eosinophilic gastritis is related to eosinophilic gastroenteritis, varying only in regards to the extent of disease and small bowel involvement. Common symptoms reported are similar to our patient's including: abdominal pain, epigastric pain, anorexia, bloating, weight loss, diarrhea, ankle edema, dysphagia, melaena and postprandial nausea and vomiting. Microscopic features of eosinophilic infiltration usually occur in the lamina propria or submucosa with perivascular aggregates. The disease is likely mediated by eosinophils activated by various cytokines and chemokines. Therapy centers around the use of immunosuppressive agents and dietary therapy if food allergy is a factor. CASE PRESENTATION: The patient is a 31 year old Caucasian female with a past medical history significant for ulcerative colitis. She presented with recurrent bouts of vomiting, abdominal pain and chest discomfort of 11 months duration. The bouts of vomiting had been reoccurring every 7–10 days, with each episode lasting for 1–3 days. This was associated with extreme weakness and cachexia. Gastric biopsies revealed intense eosinophilic infiltration. The patient responded to glucocorticoids and azathioprine. The differential diagnosis and molecular pathogenesis of eosinophilic gastritis as well as the molecular effects of glucocorticoids in eosinophilic disorders are discussed. CONCLUSIONS: The patient responded to a combination of glucocorticosteroids and azathioprine with decreased eosinophilia and symptoms. It is likely that eosinophil-active cytokines such as interleukin-3 (IL-3), granulocyte macrophage colony stimulating factor (GM-CSF) and IL-5 play pivotal roles in this disease. Chemokines such as eotaxin may be involved in eosinophil recruitment. These mediators are downregulated or inhibited by the use of immunosuppressive medications