996 research outputs found
Interview with Ruba Salih, by Nadeem Karkabi and Sonia Boulos
No full textOn the occasion of publishing a special issue of Palestine/
Israel Review (PIR) on the decolonization of the city of Haifa, PIR interviewed Ruba Salih, a professor of anthropology at the Department of
Arts, University of Bologna. Salih’s research focuses on transnational
migration and diasporas across Europe, the Middle East, and North
Africa; Islam and gender; the Palestine question and refugees; and
trauma and conflict in the Middle East. She is the author of numerous academic works, including the book Gender in Transnationalism:
Home, Longing and Belonging among Moroccan (Routledge, 2003), and
the article “Bodies That Walk, Bodies That Talk, Bodies That Love: Palestinian Women Refugees, Affectivity, and the Politics of the Ordinary” (Antipode, 2017). Currently, she is working on a book on waiting and the politics of return among Palestinian refugees (Cambridge University Press). Ruba herself is the daughter of a Palestinian refugee from
Haifa, and her mother was born in Yafa/Jaffa. PIR held an interview
with her to talk about her work and her own experience of refuge as a
descendant of Palestinian refugees from Haifa. Nadeem Karkabi and
Sonia Boulos conducted the interview for PIR
El Hadidi, M. et Boulos, L. — Street trees in Egypt. Giza, Publications of the Cairo University Herbarium, n° 1, 1968
No full textBourlière François. El Hadidi, M. et Boulos, L. — Street trees in Egypt. Giza, Publications of the Cairo University Herbarium, n° 1, 1968. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 23, n°2, 1969. p. 219
Numerical and experimental study of transferred arc in argon
No full textThe bidimensional model of the electric arc is enhanced with the
plasma–electrodes interaction to predict the properties and the energy distribution of an argon arc operating with current intensities between 100 and 200A and electrode gaps of 10 and 20 mm. An adaptive numerical insulation is applied to the cathode, to properly simulate its thermionic emission mechanism and overcome the dependence on empirical distributions of the current density at its tip. The numerical results are quantitatively compared with the data obtained from calorimetric and spectroscopical measurements, performed on a device
which generates a transferred arc between a water cooled copper anode and a thoriated tungsten cathode enclosed in a stainless steel chamber. The calculation of the heat fluxes towards the electrodes permits to determine the amount of power delivered to each component of the arc system (the anode, the cathode assembly and the chamber) and to evaluate the overall efficiency of the process for different configurations. The agreement between theory and data, over the range of parameters
investigated, is sensible both in the temperature profiles and in the energy distributions. In such configurations, the conduction from the hot gas is the most relevant term in the overall heat transferred to the anode, but it is the electron transfer which rules the heat transfer in the arc attachment zone.
The arc attachment radius is also dependent on the process parameters and increases with the arc current (from approximately 5mm at 100A to 7mm at 200 A) and the arc length. However the maximum heat flux reached on the axis decreases increasing the gap between the electrodes, although
more power is delivered to the anode due to the radial spreading of the plasma. A 10mm 200A argon arc releases to the anode about 2.6kW, which corresponds to 75% of the total arc power available. If the arc is extended to 20mm the power transferred rises by nearly 350 W, but the overall efficiency drops to 65% due to the increased losses towards the chamber.
The power delivered to the anode increases almost linearly with the arc current, presenting a slope of about 15WA−1, independent of the arc length
Modelling and Comparison of Different Design Solutions for DC Transferred Arc Plasma Cutting Torches
No full textModelling and Comparison of Different Design Solutions for DC Transferred Arc
Plasma Cutting Torches
V. Colombo, E. Ghedini
Department of Mechanical Engineering (D.I.E.M.) and Research Center for Applied Mathematics (C.I.R.A.M.)
Università di Bologna, Via Saragozza 8, 40123 Bologna, Italy
S. Dallavalle, M. Vancini,
Cebora S.p.A., Via Andrea Costa 24, 40057 Cadriano di Granarolo, Italy
The aim of this work is to investigate by means of a 2-D and 3-D FLUENT© based numerical model the behaviour of different types of transferred arc dual gas plasma torches used for cutting of metallic materials, putting into evidence the physical reasons for the industrial success of various design and process solutions appeared over the last years, such as: secondary gas swirl injections with different directions, various different approaches for the geometry of the plasma chamber, the effect of externally superimposed magnetic fields. Flow and heat transfer equations are solved with coupled electromagnetic ones, for a LTE optically thin plasma, while turbulence phenomena are taken into account by means of a k-ε RNG model. Simulations include a prediction of the thermal behaviour of the solid components of the torch head, including electrode and hafnium insert, thermal histories and trajectories of hafnium oxide particles emitted from it under idealized conditions and the efficiency of nozzle and electrode cooling systems in various operating conditions including gas mixtures (O2/air, H35/N2, N2/N2). Radiation is included in the calculation of heat transfer to the surfaces of the components using a customized Discrete Ordinate (DO) model. Results obtained from the simulations of one of the plasma torches here considered are also compared with experimental measurements in order to perform a validation of the model for what concerns pressure values in different regions of the device, and the gas mass flow rate during the working phase. For this purpose two suitably modified plasma torches with pressure and temperature measurement systems have been designed and used during realistic cutting conditions.
V. Colombo, E. Ghedini, S. Dallavalle, M. Vancini, 3-D Fluidynamic and Plasma Characterization of DC Transferred Arc Plasma Torches for Metal Cutting. 17th International Symposium on Plasma Chemistry (ISPC-17). Toronto, august 2005.
V. Colombo, E. Ghedini, G. Masini, D. Russo, S. Dallavalle, M. Vancini, 2-D And 3-D Fluidynamic And Plasma Characterization Of Dc Transferred Arc Plasma Torches For Metal Cutting, High Technology Plasma Processes 9 -HTPP9, St. Petersburg (2006); in press on Journal of High Temperature Material Processes
Nerve sheath tumor with degenerative atypia and multivacuolated lipoblasts
No full textLipoblastic nerve sheath tumor is a recently described benign soft tissue tumor consisting of lipoblasts in a neural-schwannian background. The 6 reported cases have exclusively comprised signet ring lipoblasts and showed no cellular atypia. The authors describe the first lipoblastic nerve sheath tumor to harbor multivacuolated lipoblasts and degenerative atypia, underscoring its important differential diagnosis with well-differentiated liposarcoma. The purpose of this report is to expand the morphologic spectrum of this unusual neoplasm, and reemphasize the potential of benign nonadipocytic tumors to harbor multivacuolated lipoblasts and mimic liposarcoma. © 2012 The Author(s).Ayad T, 2007, EUR ARCH OTO-RHINO-L, V264, P93, DOI 10.1007-s00405-006-0119-6; Ceballos KM, 1999, ARCH PATHOL LAB MED, V123, P941; Chen E, 2010, AM J SURG PATHOL, V34, P707, DOI 10.1097-PAS.0b013e3181d74bdb; Coffin CM, 2009, AM J SURG PATHOL, V33, P1705, DOI 10.1097-PAS.0b013e3181b76462; Dei Tos Angelo P., 1994, American Journal of Surgical Pathology, V18, P913, DOI 10.1097-00000478-199409000-00006; Fukunaga M, 1998, PATHOL INT, V48, P562, DOI 10.1111-j.1440-1827.1998.tb03950.x; Hornick JL, 2004, AM J SURG PATHOL, V28, P1257, DOI 10.1097-01.pas.0000135524.73447.4a; Khalifa MA, 2000, AM J CLIN PATHOL, V114, P123; Lae ME, 2002, HISTOPATHOLOGY, V40, P505, DOI 10.1046-j.1365-2559.2002.01409.x; Mentzel T, 2010, MODERN PATHOL, V23, P729, DOI 10.1038-modpathol.2010.66; Plaza JA, 2006, AM J SURG PATHOL, V30, P337; Vecchio G M, 2010, Pathologica, V102, P108; Weiss SW, 2008, ENZINGER WEISSS SOFT; Weiss S W, 1996, Monogr Pathol, V38, P2070
Phenotyping of type II and IV hyperlipoproteinemias by a simple, quantitative agarose gel lipoprotein electrophoresis
No full textFrom the statistical analysis of the densitometric percentage counts derived from 97 lipoprotein electrophoreses from patients with Type II or Type IV hyperlipoproteinemia, we developed a simple sequential screening approach. The method is highly accurate in assigning patients to their proper diagnostic classification. Also, the method is nonparametric, i.e., distribution-free, and considers one variable at a time for discrimination. This method, apart from sampling errors, does not give misclassified patients, but may give some undecided cases
Prevalence of overweight and obesity in adults from North Africa
No full textThe share of North African immigrants in Europe is growing continuously. In this review, we aimed to systematically analyse and describe the literature on weight status and physical activity in North African adults, both in their home country and after immigration to Europe. Existing data on North African residents and on North African immigrants in Europe were analysed by a systematic search on PUBMED. There is a wide variation among countries in the prevalence of overweight/obesity, with immigrants showing higher values. The overall results revealed a higher prevalence of overweight and obesity in females than in males in North African residents. Females also show higher levels of obesity among immigrants. In particular, literature reports indicate that 1.3-47.8% of North African residents and 3.6-49.4% of North African immigrants in adult age are overweight or obese. Physical inactivity is higher than 20% in males and 40% in females in North African residents. The highest frequency of physically inactive or lightly active people among immigrants was observed in first-generation Sudanese and Moroccans in Amsterdam (males: 57.1%; females: 74.2%), with increasing rates in second-generation females. The results underline a higher health risk in North African immigrants than in residents. Specific public health strategies should be adopted in various populations of North African origin to control the obesity epidemic.The share of North African immigrants in Europe is growing continuously. In this review, we aimed to systematically analyse and describe the literature on weight status and physical activity in North African adults, both in their home country and after immigration to Europe. Existing data on North African residents and on North African immigrants in Europe were analysed by a systematic search on PUBMED. There is a wide variation among countries in the prevalence of overweight/obesity, with immigrants showing higher values. The overall results revealed a higher prevalence of overweight and obesity in females than in males in North African residents. Females also show higher levels of obesity among immigrants. In particular, literature reports indicate that 1.3-47.8% of North African residents and 3.6-49.4% of North African immigrants in adult age are overweight or obese. Physical inactivity is higher than 20% in males and 40% in females in North African residents. The highest frequency of physically inactive or lightly active people among immigrants was observed in first-generation Sudanese and Moroccans in Amsterdam (males: 57.1%; females: 74.2%), with increasing rates in second-generation females. The results underline a higher health risk in North African immigrants than in residents. Specific public health strategies should be adopted in various populations of North African origin to control the obesity epidemic. © 2014 The Author 2014. Published by Oxford University Press on behalf of the European Public Health Association. All rights reserved
Indeterminate and Erroneous Fine-Needle Aspirates of Breast with Focus on the 'True Gray Zone': A Review
No full textObjective: To review our experience and the literature on inconclusive-erroneous fine-needle aspirates (FNAs) of breast with the focus on the 'true gray zone'. To describe the cytology, differential diagnosis, pitfalls and limitations of common and rare lesions. Study Design: We conducted a literature search focusing on breast FNAs with statistical data of C3 and C4 categories including false-positive and false-negative cases. Similar data from 2003 to 2009 was obtained from our institution. Results: C3 and C4 categories account for 3-17percent of breast FNAs. Contributing factors are technical difficulties, inexperienced pathologists interpreting FNAs of breast and overlap of cytologic features of certain benign and malignant conditions; this last, 'true gray zone' accounts for 2percent of cases. Fibroadenoma, proliferative breast lesions, gynecomastia, infiltrating and in situ low-grade adenocarcinomas and tubular, cribriform, lobular and mucinous carcinomas are the most common problematic lesions. Granular cell tumor, adenomyoepithelioma, pregnancy-related lesions, fat necrosis, inflammatory and radiation changes, adenoid cystic carcinoma, spindle-cell lesions and Phyllodes tumor are less common. Conclusion: Inconclusive-erroneous FNAs of breast due to the 'true gray zone' are rare. Most are due to the overlapping cytologic features of some benign and malignant conditions. Practical features that may help arrive at the correct diagnoses are elucidated. Copyright © 2013 S. 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Advanced Modelling of Thermal Plasmas for Industrial Applications
No full textAdvanced Modelling of Thermal Plasmas for Industrial Applications
V. Colombo, E. Ghedini
Department of Mechanical Engineering (D.I.E.M.) and Research Center for Applied Mathematics (C.I.R.A.M.)
Università di Bologna, Via Saragozza 8, 40123 Bologna, Italy
Modeling results are presented for different industrial thermal plasma sources using a customized version of the commercial code FLUENT capable of 2D and 3D transient simulation with advanced CFD models that take into account turbulence effects using different approaches (Reynolds Stress Model and Large Eddy Simulation), species transport and radiation (Discrete Ordinate Model with interaction between radiation and solid surfaces). Simulations results are presented in order to show the capabilities of this modeling tool, which is very useful for the design of a wide range of atmospheric pressure thermal plasmas devices and applications, such as: ICPTs with injection of powders for spheroidization purposes (showing the trajectory and heating history of powders injected in the torch through a carrier gas together with their effect on the plasma discharge for various geometric, electric and operating conditions by means of an improved turbulent version of a 3-D previously developed code where the helicoidal coil and the gas injection section of industrial plasma torches are taken into account without geometry simplifications), twin-torch DC transferred arc plasma systems for waste treatment (showing time-dependent effects arising in the fluid flow and temperature distribution of a plasma transferred electric arc discharge generated between two suspended metallic electrodes used inside a plasma furnace for hazardous waste incineration with turbulence effects taken into account using a RANS approach, as well as the effect on the discharge characteristics of using different types of plasma gas (air and Ar/H2 mixtures), for various geometric and operating conditions), DC non-transferred arc torch for plasma spraying (3-D time dependent model to simulate the behaviour of such a device without any external assumption on the anode restriking and attachment and to simulate also the downstream expansion of the plasma jet after the torch nozzle using a LES turbulence model).
D. Bernardi, V. Colombo, E. Ghedini, A. Mentrelli, Pure and Applied Chemistry, 77, pp. 359 – 372, (2005).
D. Bernardi, V. Colombo, E. Ghedini, A. Mentrelli, T.Trombetti, Czechoslovak Journal of Physics. 54, pp. C489 - C515 (2004).
D. Bernardi, V. Colombo, E. Ghedini, A. Mentrelli, T. Trombetti, IEEE Transactions on Plasma Science, 33, pp. 424–425 (2005).
D. Bernardi, V. Colombo, E. Ghedini, A. Mentrelli, IEEE Transactions on Plasma Science, 33, pp. 426–427 (2005).
D. Bernardi, V. Colombo, E. Ghedini, S. Melini, A. Mentrelli, Three-dimensional time-dependent modelling of magnetically deflected transferred arc, IEEE Transaction On Plasma Science 33, 428-429 (2005).
V. Colombo, E. Ghedini, Time Dependent 3-D Simulation of a DC Non-Transferred Arc Plasma Torch: Anode Attachment and Downstream Region Effects, Proc. of the 17th Int. Symp. on Plasma Chemistry-ISPC17 (2005).
V. Colombo, E. Ghedini, A. Mentrelli, E. Malfa, 3-D Modelling of DC Transferred arc Twin Torch for Asbestos Inertization. In Nuclear Reactor Physics. A collection of papers dedicated to Silvio Edoardo Corno, Torino, C.L.U.T., pp. 169 - 196 (2005).
V. Colombo, E. Ghedini, Time-Dependent 3-D Modelling Of Dc Transferred Arc Twin Torch, High Technology Plasma Processes 9 - HTPP9, St. Petersburg (2006)
Clinical and biological significance of E-cadherin protein expression in invasive lobular carcinoma of the breast
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