Theory of the Quantum Critical Fluctuations in Cuprates

The statistical mechanics of the time-reversal and inversion symmetry breaking order parameter, possibly observed in the pseudogap region of the phase diagram of the Cuprates, can be represented by the Ashkin-Teller model. We add kinetic energy and dissipation to the model for a quantum generalization and show that the correlations are determined by two sets of charges, one interacting locally in time and logarithmically in space and the other locally in space and logarithmically in time. The quantum critical fluctuations are derived and shown to be of the form postulated in 1989 to give the marginal fermi-liquid properties. The model solved and the methods devised are likely to be of interest also to other quantum phase transitions

Linearity and Scaling of a Statistical Model for the Species Abundance Distribution

We derive a linear recursion relation for the species abundance distribution in a statistical model of ecology and demonstrate the existence of a scaling solution

Kajian Karakteristik, Persebaran dan Kebijakan Reog Ponorogo di Kabupaten Ponorogo Provinsi Jawa Timur

Indonesia kaya akan khasanah budaya, salah satunya kesenian Reog Ponorogo. Kekhasan dan perkembangan kesenian Reog di daerah asalnya, menarik untuk dipelajari. Berdasarkan data yang diperoleh dengan indepth interview terhadap narasumber terpilih, dan dikaji dengan pendekatan kualitatif, dapat dirumuskan, (1) Kesenian Reog memiliki karakteristik dalam bentuk sendratari jathil, warok, gemblakan, barongan, dan caplokan. Terjadi pergeseran makna dan fungsi Reog, dari ritual budaya menjadi industri pertunjukan, sehingga kelompok yang bertahan adalah yang sering mendapat kesempatan untuk pentas. (2) Persebaran kesenian Reog dalam perkembangannya dipengaruhi oleh akses menuju lokasi dari pusat pertumbuhan (kota). Hal ini berkaitan dengan intensitas pertunjukan yang lebih banyak di kota. Persebaran Reog di luar Ponorogo seperti di kota Deli Serdang, Salatiga, Yogyakarta, Bandung, dan bahkan luar negeri, Malaysia, Amerika, Rusia, Jerman dan Belanda. Terjadi akulturasi dengan kesenian setempat. (3) Kebijakan yang disarankan adalah dilakukan pembinaan yang lebih intensif, pembuatan museum Reog dan memasukkan kesenian Reog dalam kurikulum pendidikan sekolah

Universality of the single-particle spectra of cuprate superconductors

All the available data for the dispersion and linewidth of the single-particle spectra above the superconducting gap and the pseudogap in metallic cuprates for any doping has universal features. The linewidth is linear in energy below a scale $\omega_c$ and constant above. The cusp in the linewidth at $\omega_c$ mandates, due to causality, a "waterfall", i.e., a vertical feature in the dispersion. These features are predicted by a recent microscopic theory. We find that all data can be quantitatively fitted by the theory with a coupling constant $\lambda_0$ and an upper cutoff at $\omega_c$ which vary by less than 50% among the different cuprates and for varying dopings. The microscopic theory also gives these values to within factors of O(2).Comment: 4 pages, 4 figures; accepted by Phys. Rev. Let

Adolescent Sexual Behaviour and Practices in Nigeria: A Twelve Year Review

Background: Adolescence is a time of opportunity and risk. During this time, attitudes, values and behaviours that forms a young person's future begin to develop and take shape. The World Health Organization (WHO) estimates that 70% of premature deaths among adults are largely due to behaviours initiated during adolescence. Age of sexual debut is generally low, yet there is dearth of knowledge on sexuality.Objective: The article reviewed the sexual practices and behaviours of Nigerian adolescents in the last twelve years.Methods: Available publications in local and international journals on adolescent sexual behaviour and practices covering a twelve-year period from January 2000 to December 2011 were retrieved from the Library (NAUTH Medical Library). Additional search for published articles was done on the internet from Pubmed/Medline and other search engines.Results: Adolescents engage in unhealthy sexual behaviours, characterized by early age at sexual initiation, unsafe sex and multiple sex partners. Reasons given for this include curiosity, peer influence, pleasure and financial benefit, amongst others.Conclusion: The strategies given in this review have the potential to increase sexual awareness in adolescents, encourage contraceptive use and improve adolescent reproductive and sexual health in the country.Keywords: Adolescent sexual behaviour, Adolescent health and development, secondary school students, adolescent pregnancy

Hubungan Kehalusan, Strength Activity Index, Berat Jenis Fly Ash Dengan Kuat Tekan Mortar Menggunakan Artificial Neural Network

Kehalusan, strength activity index dan berat jenis fly ash mempunyai pengaruh yang signifikan terhadap hasil kuat tekan mortar. Perlu dilakukan penelitian untuk mencari pengaruh sifat-sifat tersebut dengan mengetahui hubungan antara sifat fisik fly ash dengan kuat tekan mortar. Artificial Neural Network (ANN) merupakan suatu model komputasi yang bekerja seperti sel saraf biologis pada otak manusia, dipakai untuk mencari hubungan tersebut melalui proses pembelajaran Back-Propagation. Langkah-langkah penelitian meliputi pengumpulan data, pemodelan, dan pengujian pemodelan yang sudah dibuat. Kehalusan, berat jenis dan strength activity index dipakai sebagai input dan kuat tekan mortar umur 28 hari sebagai target output dalam pemodelan. Pengujian dilakukan untuk mencari performa ANN yang paling optimal pada proses pelatihan dengan nilai Mean Square Error (MSE) validation terkecil. Dari penelitian yang telah dilakukan disimpulkan bahwa ANN dapat digunakan untuk membentuk hubungan antara kehalusan, strength activity index dan berat jenis fly ash dengan hasil kuat tekan mortar dengan kesalahan antara 0%-0.054%. Pada pengujian parameter pelatihan, didapatkan bahwa performa yang optimal dihasilkan dengan 1 hidden layer dengan 3 node dengan prosentase data 70% training, 15% testing, dan 15% validation dan MSE rata-rata 5.57x10-5

Laporan Kasus: Manifestasi Oral Penderita Hipertensi berupa Ginggival Enlargement

Hypertension presents an increase in blood pressure following the oral manifestations, such as gingival enlargement. A 42-year-old woman came to the General Sudirman University Dental and Oral Hospital complaining of enlarged front gums seven years ago. The patient had a history of hypertension and regularly consumed drugs, amlodipine 5 mg. Extraoral examination revealed no lymphadenopathy and no swelling of the head and neck area. Intraoral examination revealed a gingival enlargement involving the papilla to the gingival margin present on the entire upper and lower labial gingival surface. The patient's diagnosis was gingival enlargement caused by gingival enlargement due to the use of amlodipine. Gingival enlargement has been noted with long-term or high-dose amlodipine use. The mechanism of amlodipine in causing gingival enlargement is through the role of fibroblasts with abnormal susceptibility to the drug, resulting in increased levels of protein synthesis, especially collagen. The role of pro-inflammatory cytokines occurs through an increase in interleukin-1β (IL-1β) and IL-6 in the inflamed gingival tissue due to the gingival fibrogenic response to drugs. Therapies were DHE and scaling and root planning as phase I in periodontal treatment. Plaque elimination is vital to reduce gingival inflammation that may occur. Substitution of the drug amlodipine may be needed if there is no improvement. Based on case reports, hypertension patients who took amlodipine could have gingival enlargement. The therapy given was plaque elimination in the form of DHE and Scaling and regular check-ups with the dentist

Efektivitas Penambahan Getah Pelepah Pisang Kepok (Musa Mcuminata Balbisianacolla) Pada Pigmen Kunyit (Curcuma Domestica Valet) Untuk Mengatasi Kelunturan Kain

Penambahan volume getah pisang kepok pada pigmen alami kunyit dalam mempertahankan warna dari kelunturan pada kain dilakukan dengan perbandingan pemberian volume getah pisang kepok : pigmen kunyit (80%:20%, 70%:30%, 60%:40%, 50%:50%, 40%:60%, 30%:70%). Efektifitas penambahan getah pelepah pisang Kepok diperoleh dari hasil karakterisasi material dengan mencari nilai trasmitansi yang dihasilkan cahaya laser yang dikenakan luxmeter melalui limbah pencucian sabun dengan detergen dan material kain, sehingga di dapatkan nilai transmitasi terbaik sebesar 0.68, di hasilkan dari penambahan getah pelepah pisang kepok sebesar 40%. Getah pisang kapok mampu sebagai pengikat pigmen alami kunyit, dalam mempertahankan kelunturan pada kain