Transient Marangoni convection in hanging evaporating drops

Abstract. A combined experimental and numerical analysis has been carried out to study Marangoni effects during the evaporation of droplets. The experiments are performed with pendant drops of silicone oils (with different viscosities) and hydrocarbons. The temperature of the disk sustaining the drop is rapidly increased or decreased in order to study transient heating or cooling processes. The velocity field in the droplet is evaluated monitoring the motion of tracers in the meridian plane, using a laser sheet illumination system and a video camera. Surface temperature distributions of the drops are detected by infrared thermocamera. The numerical model is based on axisymmetric Navier-Stokes equations, taking into account the presence of Marangoni shear stresses and evaporative cooling at the liquid-air interface. Marangoni flows cause a larger, more uniform surface temperature, increasing heat transfer from disk to droplet, as well as evaporation rate. When Marangoni effects are negligible, larger surface temperature differences occur along the drop surface and heat transfer is relatively small. The role of Marangoni and buoyancy flows in silicone oils with different viscosities and hydrocarbons is discussed and correlations are presented between experimental and numerical results. Keywords: Viscosity of liquids; diffusive momentum transport, Evaporation and condensation, Surface tension and related phenomena, Flows in ducts, channels, nozzles, and conduit

A parallel compact-TVD method for compressible fluid dynamics employing shared and distributed-memory paradigms

A novel multi-block compact-TVD finite difference method for the simulation of compressible flows is presented. The method combines distributed and shared-memory paradigms to take advantage of the configuration of modern supercomputers that host many cores per shared-memory node. In our approach a domain decomposition technique is applied to a compact scheme using explicit flux formulas at block interfaces. This method offers great improvement in performance over earlier parallel compact methods that rely on the parallel solution of a linear system. A test case is presented to assess the accuracy and parallel performance of the new method

Una estructura espacial recurrente en el libro I de la Eneida

Fil: La Fico Guzzo, María Luisa

El espacio representado como símbolo del espacio literario en el libro 6 de la Eneida

El objetivo del presente trabajo es el análisis del carácter simbólico del espacio representado en el libro 6 de la Eneida, específicamente, de uno de sus sentidos indirectos o simbólicos: el literario o poético.The aim of this paper is the analysis of the symbolic character of the space represented in Aeneid 6, specifically, of one of its indirect or symbolic senses: the literary or poetic

Short and long term results of the laparoscopic Heller–Dor myotomy. The influence of age and previous conservative therapies

Analisi dei risultati della terapia chirurgica dell'acalasia esofagea con tecnica di Heller-Dor laparoscopica in pazienti anziani con e senza dilatazione pneumatica pregress

Action of HMGB1 on miR221/222 cluster in neuroblastoma cell lines

microRNA (miR/miRNA) are small non-coding RNAs that control gene expression at the post-transcriptional level by targeting mRNAs. Aberrant expression of miRNAs is often observed in different types of cancer. Specific miRNAs function as tumor suppressors or oncogenes and interfere with various aspects of carcinogenesis, including differentiation, proliferation and invasion. Upregulation of miRNAs 221 and 222 has been shown to induce a malignant phenotype in numerous human cancers via inhibition of phosphatase and tensin homolog (PTEN) expression. Neuroblastoma is the most common extracranial solid malignancy in children, which is characterized by cellular heterogeneity that corresponds to different clinical outcomes. The different cellular phenotypes are associated with different gene mutations and miRs that control genetic and epigenetic factors. For this reason miRs are considered a potential therapeutic target in neuroblastoma. The aim of the present study was to investigate the mechanisms by which extracellular high mobility group box 1 (HMGB1) promotes cell growth in neuroblastoma. SK-N-BE(2) and SH-SY5Y neuroblastoma derived cell lines were transfected with the antisense oligonucleotides, anti-miR-221 and -222, followed by treatment with HMGB1 to investigate the expression of the oncosuppressor PTEN. In this study, it was demonstrated that HMGB1, which is released by damaged cells and tumor cells, upregulates miR-221/222 oncogenic clusters in the two human neuroblastoma derived cell lines. The results revealed that the oncogenic cluster miRs 221/222 were more highly expressed by the most undifferentiated cell line [SK-N-BE(2)] compared with the the less tumorigenic cell line (SH-SY5Y) and that exogenous HMGB1 increases this expression. In addition, HMGB1 modulates PTEN expression via miR-221/222, as demonstrated by transiently blocking miR-221/222 with anti-sense oligonucleotides. These results may lead to the development of novel therapeutic strategies for neuroblastoma

Acerca del uso de deícticos en la Eneida

El objetivo de este trabajo es realizar un acercamiento al análisis del empleo de la deixis en la Eneida. Nuestra hipótesis es que los deícticos cumplen la compleja función de ubicar al lector en el interior de una estructura, que no sólo es significativa en el ámbito espacio – temporal representado, sino que también proyecta su sentido en múltiples dimensiones, tales como la semántica, la genérica y la textual o metaliteraria.The aim of this paper is to approach the analysis of «deixis» in the Aeneid. Our hypothesis is that deictics locate the reader in a complex structure, not only significant at the spatial-temporal level, but also in other dimensions, such as the semantic, the generic, and the textual or «metaliterary» level

A multidisciplinary reference framework to support implementation and assessment of diabetes care in community settings: study design

Diabetes is a disease presenting multifaceted challenges. A holistic approach is needed to properly address it. The Chronic Care Model, worldwide reference for managing chronic disease in community settings, support implementation at micro-meso--macro level. We present a multi-disciplinary framework that support the uptake of the Chronic Care Model. This framework was tested to support the implementation of a research project focused on Diabetes Management through personal health systems

Analisa dan Perancangan Sistem Informasi Pengarsipan Berkas Pertanggungjawaban Anggaran APBD pada Dinas Pemuda dan Olahraga Provinsi Kepulauan Bangka Belitung

Sistem pengelolaan arsip memegang peranan penting bagi jalannya suatu organisasi yang dapat bermanfaat sebagai sumber informasi yang dapat dijadikan bahan penilaian dan pengambilan keputusan untuk penyusunan program pengembangan organisasi. Pengarsipan berkas pertanggungjawaban anggaran belanja derah yang dilakukan di Dinas Pemuda dan Olahraga Provinsi Kepulauan Bangka Belitung belum begitu baik dimana sering terjadi kehilangan berkas dan tidak pernah dilakukan backup data sehingga berkas harus dibuat ulang. Untuk itu dirasakan perlu adanya sebuah sistem informasi yang dapat membantu mengatasi permasalahan yang ada. Analisa dan perancangan sistem dalam penelitian ini menggunakan metode berorientasi objek dengan pemodelan UML dan menggunakan tools Rational Rose. Penelitian ini menghasilkan desain sistem informasi pengarsipan yang mampu menghasilkan informasi yang cepat dan akurat bagi pengambilan keputusan