Accurate Band Gaps for Semiconductors from Density Functional Theory

An essential issue in developing semiconductor devices for photovoltaics and thermoelectrics is to design materials with appropriate band gaps plus the proper positioning of dopant levels relative to the bands. Local density (LDA) and generalized gradient approximation (GGA) density functionals generally underestimate band gaps for semiconductors and sometimes incorrectly predict a metal. Hybrid functionals that include some exact Hartree-Fock exchange are known to be better. We show here for CuInSe_2, the parent compound of the promising CIGS Cu(In_xGa_(1-x))Se_2 solar devices, that LDA and GGA obtain gaps of 0.0-0.01 eV (experiment is 1.04 eV), while the historically first global hybrid functional, B3PW91, is surprisingly better than B3LYP with band gaps of 1.07 and 0.95 eV, respectively. Furthermore, we show that for 27 related binary and ternary semiconductors, B3PW91 predicts gaps with a mean average deviation (MAD) of only 0.09 eV, which is substantially better than all modern hybrid functionals

Effect of Piper betle and Brucea javanica on the Differential Expression of Hyphal Wall Protein (HWP1) in Non-Candida albicans Candida (NCAC) Species

The study aimed to identify the HWP1 gene in non-Candida albicans Candida species and the differential expression of HWP1 following treatment with Piper betle and Brucea javanica aqueous extracts. All candidal suspensions were standardized to 1 x 10(6) cells/mL. The suspension was incubated overnight at 37 degrees C (C. parapsilosis, 35 degrees C). Candidal cells were treated with each respective extract at 1, 3, and 6 mg/mL for 24 h. The total RNA was extracted and reverse transcription-polymerase chain reaction was carried out with a specific primer of HWP1. HWP1 mRNAs were only detected in C. albicans, C. parapsilosis, and C. tropicalis. Exposing the cells to the aqueous extracts has affected the expression of HWP1 transcripts. C. albicans, C. parapsilosis, and C. tropicalis have demonstrated different intensity of mRNA. Compared to P. betle, B. javanica demonstrated a higher suppression on the transcript levels of HWP1 in all samples. HWP1 was not detected in C. albicans following the treatment of B. javanica at 1 mg/mL. In contrast, C. parapsilosis and C. tropicalis were shown to have HWP1 regulation. However, the expression levels were reduced upon the addition of higher concentration of B. javanica extract. P. betle and B. javanica have potential to be developed as oral health product.Article Link : http://www.hindawi.com/journals/ecam/2013/397268

Can a wormhole generate electromagnetic field?

We have considered the possibility of a slowly rotating wormhole surrounded by a cloud of charged particles. Due to slow rotation of the wormhole, the charged particles are dragged thereby producing an electromagnetic field. We have determined the strength of this electromagnetic field and the corresponding flux of radiation.Comment: 9 pages, typos fixe

Quintessential Quartic Quasi-topological Quartet

We construct the quartic version of generalized quasi-topological gravity, which was recently constructed to cubic order in arXiv: 1703.01631. This class of theories includes Lovelock gravity and a known form of quartic quasi-topological gravity as special cases and possess a number of remarkable properties: (i) In vacuum, or in the presence of suitable matter, there is a single independent field equation which is a total derivative. (ii) At the linearized level, the equations of motion on a maximally symmetric background are second order, coinciding with the linearized Einstein equations up to a redefinition of Newton's constant. Therefore, these theories propagate only the massless, transverse graviton on a maximally symmetric background. (iii) While the Lovelock and quasi-topological terms are trivial in four dimensions, there exist four new generalized quasi-topological terms (the quartet) that are nontrivial, leading to interesting higher curvature theories in $d \geq 4$ dimensions that appear well suited for holographic study. We construct four dimensional black hole solutions to the theory and study their properties. A study of black brane solutions in arbitrary dimensions reveals that these solutions are modified from the `universal' properties these solutions have. This result may lead to interesting consequences for the dual CFTs.Comment: 46 pages, 1 figure. Discussion of black branes added to section

Branching Ratio and CP-asymmetry for B-> 1^{1}P_{1}gamma decays

We calculate the branching ratios for B_{d}^{0}->(b_{1},h_{1})gamma at next-to-leading order (NLO) of alpha_{s} where b_{1} and h_{1} are the corresponding radially excited axial vector mesons of rho and omega respectively. Using the SU(3)symmetry for the form factor, the branching ratio for B_{d}^{0}->(b_{1},h_{1})gamma is expressed in terms of the branching ratio of the B_{d}^{0}-> K_{1}gamma and it is found to be B(B_{d}^{0}->b_{1}gamma)=0.71* 10^{-6} and B(B_{d}^{0}-> h_{1}gamma) =0.74*10^{-6}. We also calculate direct CP asymmetry for these decays and find, in confirmity with the observations made in the literature, that the hard spectator contributions significantely reduces the asymmetry arising from the vertex corrections alone. The value of CP-asymmetry is 10% and is negative like rho and omega in the Standard Model.Comment: 10 pages, 2 figure

Power Law Entropy Corrected New-Agegraphic Dark Energy in Ho\v{r}ava-Lifshitz Cosmology

We investigate the new agegraphic dark energy (NADE) model with power-law corrected entropy in the framework of Ho\v{r}ava-Lifshitz cosmology. For a non-flat universe containing the interacting power-law entropy-corrected NADE (PLECNADE) with dark matter, we obtain the differential equation of the evolution of density parameter as well as the deceleration parameter. To study parametric behavior, we used an interesting form of state parameter as function of redshift $\omega_{\Lambda}(z)=\omega_0+\omega_1 z$. We found that phantom crossing occurs for the state parameter for a non-zero coupling parameter, thus supporting interacting dark energy model.Comment: 13 pages, 2 figures, accepted for publication in 'Canadian J. Phys.

Konstruksi Hukum Acara Peradilan Agama Menuju Terwujudnya Putusan yang Adil

Peradilan Agama sejak diakui oleh pemerintah Hindia Belanda pada tahun 1882 untuk Jawa dan Madura sampai dengan tahun 1989 belum mempunyai hukum acara yang tersusun dalam satu kitab. Peradilan Agama baru mempunyai hukum acara setelah berlakunya Undang-Undang No. 7 Tahun 1989 jo Undang-undang No 3 tahun 2006 tentang Peradilan Agama, akan tetapi masih terbagi dalam dua sumber, yaitu: (1) UU No. 7 tahun 1989 jo UU No. 3 tahun 2006 khusus untuk perkawinan, (2) hukum acara perdata pada pengadilan di lingkungan peradilan umum di luar perkara perkawinan. Dalam perkara di luar perkawinan antara konpetensi dan sumber hukum materiilnya dengan hukum acaranya tidak sejalan, sebab kompetensinya perkara Islam, sumber hukum materiilnya juga hukum Islam, sedangkan hukum acaranya adalah acara perdata pada pengadilan di lingkungan peradilan umum yang bersumber dari Het Herziene Indonesisch Reglement (HIR) dan Rechtsreglement Buitengewesten (R.Bg), dan Burgelijk Wetboek (BW) buku IV. Masalah dalam penelitian ini ada dua (1) Bagaimana hakim mengkonstruksi hukum acara Peradilan Agama agar tercapai putusan yang adil ?. (2) Apakah hakim Peradilan Agama dalam proses menyelesaikan perkara di luar perkawinan menerapkan hukum acara lain selain hukum acara perdata pada peradilan umum ?. Tujuan penelitian ini (1) untuk mengkonstruksi hukum acara yang berlaku pada Peradilan Agama, (2) menemukan hukum acara yang diterapkan hakim Peradilan Agama dalam proses penyelesaian perkara di luar perkawinan. Data dalam penelitian ini adalah data kualitatif, oleh karenanya penelitian ini merupakan penelitian kualitatif. Pendekatan yang digunakan adalah Hermeneutika fenomenologi. Hasil penelitian, hakim Peradilan Agama mengkonstruksi hukum acara dalam proses penyelesaian kasus di luar perkawinan adalah gabungan antara hukum acara pada pengadilan di lingkungan peradilan umum dan hukum acara peradilan Islam. Hal ini dilakukan oleh hakim dalam rangka menghasilkan putusan yang adil. Konstruksi putusan yang adil bagi hakim adalah keadilan didasarkan pada nilai tertinggi yang dapat dipertanggungjawabkan kepada tuhan. Untuk menghasilkan putusan yang adil hakim Pengadilan Agama masih mengambil hukum acara Islam dalam proses penyelesaian perkara di luar perkawinan, hakim tidak sepenuhnya menerapkan hukum acara perdata yang berlaku pada pengadilan di lingkungan Peradilan Umum.Kata kunci: Konstruksi, Peradilan Agama, Hukum acara