Computational modelling of dump combustors flowfield

A computational model aimed at predicting the flowfield of dump combustors is presented. The turbulent combustion model is based on the conserved scalar approach and on a convenient specification of its probability density function, which reduces the computation of the mean density to a closed form. Turbulence is modeled by means of the k-epsilon model. The averaged conservation equations are solved by a technique based on a staggered grid and on the SIMPLE solver. The computational model is applied to a simple dump combustor to assess the computer time requirements and accuracy. The turbulent combustion model is shown to reduce the computer time by an order of magnitude when compared to evaluating the mean density by numerical quadrature

HUBUNGAN KEBIASAN SARAPAN DAN STATUS HIDRASI DENGAN KONSENTRASI BERFIKIR PADA REMAJA

Latar Belakang : Masalah gizi pada remaja akan berdampak negatif pada tingkat kesehatan masyarakat. Masalah gizi tersebut antara lain anemia dan IMT kurang dari batas normal atau kurus. Prevalensi remaja dengan IMT kurus berkisar antara 30 % - 40 %. Keadaan status gizi remaja salah satunya dipengaruhi oleh pola konsumsi makan yaitu keterbatasan makanan atau membatasi sendiri makanannya karena faktor ingin langsing. Selain itu masalah gizi pada remaja adalah rendahnya kebiasaan sarapan. Remaja yang tidak terbiasa melakukan sarapan 79,2% mempunyai prestasi sekolah yang kurang. Tingginya angka remaja yang tidak terbiasa sarapan berpengaruh pada status hidrasi yang berkorelasi terhadap konsentrasi berfikir. Tujuan: Menganalisis hubungan antara kebiasaan sarapan dan status hidrasi dengan konsentrasi berfikir pada remaja Metode:Penelitian ini menggunakan desain cross sectional. Subjek pada penelitian ini adalah remaja perempuan. Jumlah subjek sebanyak 80 remaja dipilih menggunakan metode simple random sampling . Pengambilan data status hidrasi menggunakan indikator berat jenis urin. Data konsentrasi berfikir menggunakan Digit Symbol Test dan Digit Span Test dari subtest WAIS ( Weschler Adult intelegence Scale) yang dilakukan oleh lembaga psikologi terapan yang tersertifikasi. Data kebiasaan sarapan dikumpulkan berdasarkan wawancara dengan kuesioner. Hasil : Sebanyak 52,5 % siswa terbiasa melakukan sarapan dan 47, 5 % subjek tidak terbiasa melakukan sarapan. Dari hasil analisis berat jenis urin didapatkan sebanyak 70 % subjek mengalami dehidrasi dan 30 % tidak dehidrasi (normal). Berdasarkan hasil test konsentrasi tersebut didapat 48,25 % subjek memiliki kemampuan konsentrasi rendah dan 51,75 % memiliki kemampuan konsentrasi tinggi. Terdapat hubungan yang signifikan antara kebiasaan sarapan dan konsentrasi berfikir (p=0,00). Tidak terdapat hubungan antara status hidrasi dengan konsentrasi berfikir (p=0,35) Kesimpulan :Terdapat hubungan antara kebiasaan sarapan dengan konsentrasi berfikir . Tidak terdapat hubungan antara status hidrasi dengan konsentrasi berfikir

Ebola therapy: Developing new drugs or repurposing old ones?

The lack of Ebola therapies has recently kindled the debate about the possible repurposing of approved organotropic (i. e., not etiotropic) drugs for the treatment of this unmet medical emergency [1]. The scientific community is now facing an apparently dichotomal opportunity: focusing efforts on the time-consuming attempt to develop new drugs [2] or preferring the apparently quicker approach of repurposed ones [3]. Of course, each choice would subtract time and resources to the other and some scholars fear the possibility that some of the repurposed drugs might even worsen the viral pathology by changing the immune response [1]. Probably, what we are going to say is trivial, but we wonder if any statistical analysis of the organotropic therapies circumstantially used so far by Ebola patients has been done. This study could suggest which drugs might be more suited to offer beneficial effect against Ebola, if any. For example, some cardiovascular drugs previously demonstrated to be endowed with antiviral properties in vitro [3], might display higher prevalence amongst survived Ebola patients, thus proposing themselves as candidates for repurposing. Conversely, the systematic review of the medicines assumed in unlucky anecdotes might indicate which drugs should be considered as the second choice in the above studies

Investigations on a Bull's Head from Pyrgos/Mavroraki (LM) To Design the Biodiversity of Cyprus in Early-Middle Bronze Age

The site of Pyrgos-Mavroraki near Limassol in Cyprus, destroyed by an earthquake in 1900-1850 B. C., is situated in an elevated position in the center of a vast settlement of the ancient and Middle Bronze Age before the Calcolitic period. The unchanged position of the structures and the finds, that remained unknown for 4000 years near the homonym village, offers a unique opportunity to carry out sedimentological, paleopalinolocical and archeobotanic investigations on totally uncontaminated materials. The results of the sedimentological and paleopalynology investigations and the characterization of other plants micro remains found in the samples from the bull's head SL (PY 09 D.10 B) make it possible to formulate some considerations on the vegetation in the ancient landscape.CNR Institute for Technologies Applied to Cultural Heritage, Via Salaria Km 29,500 P. O. Box 10 - 00015 Monterotondo St., Rome, Italy

Entomofauna e parassiti del mirto

Myrtle pests are mainly represented by Rhinchota homoptera and Thisanoptera. In particular, Saissetia oleae, Partenolecanium corni e Ceroplastes rusci are the most frequent species reported in Sardinia whereas Heliothrips haemorroidalis is a harmful pest in other Italian regions. Pest control in myrtle cultivations is possible only following the plant protection regulation of European organic agriculture. In fact, in Italy there currently are no conventional insecticides authorized for myrtle destined to liquor or essential oil production