Universal Properties of Cuprate Superconductors: T_c Phase Diagram, Room-Temperature Thermopower, Neutron Spin Resonance, and STM Incommensurability Explained in Terms of Chiral Plaquette Pairing

We report that four properties of cuprates and their evolution with doping are consequences of simply counting four-site plaquettes arising from doping, (1) the universal T_c phase diagram (superconductivity between ~0.05 and ~0.27 doping per CuO_2 plane and optimal T_c at ~0.16), (2) the universal doping dependence of the room-temperature thermopower, (3) the superconducting neutron spin resonance peak (the “41 meV peak”), and (4) the dispersionless scanning tunneling conductance incommensurability. Properties (1), (3), and (4) are explained with no adjustable parameters, and (2) is explained with exactly one. The successful quantitative interpretation of four very distinct aspects of cuprate phenomenology by a simple counting rule provides strong evidence for four-site plaquette percolation in these materials. This suggests that inhomogeneity, percolation, and plaquettes play an essential role in cuprates. This geometric analysis may provide a useful guide to search for new compositions and structures with improved superconducting properties

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

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

Pengaruh Posisi Matahari Dan Letak Geografis Terhadap Rasydul Qiblah Harian Di Indonesia

Rasyd al-qiblah ada dua macam yakni rasyd al-qiblah global atau tahunan dan rasyd al-qiblah global atau tahunan dan rasyd al-qiblah lokal atau harian. Di Indonesia bagian Barat (Selatan khattulistiwa) rasyd al-qiblah harian terjadi sepanjang tahun dari 1 januari samapi 31 desember, meskipun ada perbedaan waktunya antara daerah dan antara bulan. Fokus seberapa besar pengaruh posisi matahari dan letak geografis suatu tempat dari kakbah terhadap saat terjadinya rasyd al-qiblah harian di Indonesia? Dengan tujaun untuk mengetahui seberapa besar pengaruh posisi  matahari dan letak geografis suatu tempat tehadap rasyd al-qiblah harian di Indonesia. Penelitian ini menggunakan sampel purpossifAda fenomena lain yang menarik di daerah yang letak geografisnya di sekitar khattulistiwa seperti Bukit Tinggi dan sekitarnya ketika posisi matahari berada di sekitar garis balik selatan saat rasyd al-qiblah lebih awal dibandingkan dengan daerah yang relatif jauh dari khattulistiwa seperti Bayuwangi. Demikian juga dengan daerah yang bujurnya lebih dekat dengan Mekah misalnya Indonesia Bagian Barat (WIB) sepanjang tahun terjadi rasyd al-qiblah lokal, sedangkan daerah yang bujurnya jauh dari Mekah Seperti Indonesian Bagian Tengah dan Bagian Timur; pada saat posisi matahari jauh di sekitar garik balik Utara dan Selatan tidak terjadi rasyd al-qiblah bahkan bisa mencapai kurun waktu satu bulan lebih untuk masing-masing posisi.Posisi matahari dan letak geografis dari kakbah mempengaruhi saat peristiwa rasyd al-qiblah dan pengaruh posisi matahari lebih dominan dibandingkan letak geografis karena letak geografis bersifat tetap sedangkan peristiwa rasyd al-qiblah dilokasi yang sama waktunya berbeda-beda disebabkan posisi matahari yang selalu berubah-ubah sepanjang waktu

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