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A multisite photometric campaign on the pre-main-sequence<i>δ</i> Scuti pulsator IP Persei
Ripepi, V.,Bernabei, S.,Marconi, M.,Palla, F.,Arellano Ferro, A.,Bonanno, A.,Ferrara, P.,Frasca, A.,Jiang, X. J.,Kim, S.-L.,Marinoni, S.,Mignemi, G.,Monteiro, M. J. P. F. G.,Oswalt, T. D.,Reegen, P.,J EDP Sciences 2006 Astronomy and astrophysics Vol.449 No.1
New perspectives on supercritical methane adsorption in shales and associated thermodynamics
Xu Tang,Nino Ripepi,Sean Rigby,Robert Mokaya,Ellen Gilliland 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Understanding methane adsorption behavior in shales is fundamental for optimizing shale gasdevelopment as the adsorbed methane is a large portion of the subsurface shale gas resource. However,the adsorption mechanism of supercritical methane in shales and associated thermodynamics are poorlyunderstood because the equation of state of the adsorbed methane is unmeasurable. This work analyzedadsorption equilibria (up to 32 MPa and 393.15 K) using a rigorous framework that can account for nonidealgas properties and accurately extrapolate absolute adsorption uptakes from measured adsorptionisotherms. The framework also allowsy a straightforward calculation of thermodynamic potentialsrelevant to adsorption such as enthalpy and entropy. Modelling results show that methane adsorptionisotherms in shale under different pressures and temperatures are represented by a two dimensionaladsorption isotherm surface. The density of the adsorbed methane in shales depends on temperature andpressure, which is always lower than the liquid methane density but higher than the correspondinggaseous methane density. The temperature-dependent and pressure-dependent characteristics ofadsorbed methane density leads to the corresponding temperature-dependent and pressure-dependentmeasured/absolute adsorption isotherms. The maximum adsorption uptake of shales is independent oftemperature and pressure. The isosteric enthalpy/entropy of adsorption and enthalpy/entropy ofadsorbed methane are found to be temperature- and surface coverage-dependent. These newfindingstherefore not only clarify some historical misunderstandings of methane adsorption in shales forengineering application, but also provide a novel framework for interpreting methane adsorptionbehavior in shales and for determining the associated thermodynamics.
Rupture of Giant Superficial Femoral Artery Aneurysm in a Leukemic Patient Submitted to Chemotherapy
Gianfranco Varetto,Claudio Castagno,Matteo Ripepi,Paolo Garneri,Simone Quaglino,Pietro Rispoli 대한흉부외과학회 2014 Journal of Chest Surgery (J Chest Surg) Vol.47 No.4
The superficial femoral artery (SFA) is a relatively rare location for lower limb aneurysmatic disease. In the literature, this disease is described an association between a relatively high growth rate and/or the rupture of aneurysms and chemotherapeutic agents. We report a case of the rupture of a giant SFA aneurysm in a patient during chemotherapy for acute lymphatic leukemia.
Multichannel Intraluminal Impedance and pH Monitoring: A Step Towards Pediatric Reference Values
( Francesco Cresi ),( Elena Andrea Cester ),( Silvia Salvatore ),( Domenico Umberto De Rose ),( Antonio Ripepi ),( Anna Maria Magist ),( Claudia Fontana ),( Elena Maggiora ),( Alessandra Coscia ),( Ru 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2020 Journal of Neurogastroenterology and Motility (JNM Vol.26 No.3
Background/Aims Combined multichannel intraluminal impedance and pH monitoring (MII/pH) is considered the most accurate test to detect gastroesophageal reflux (GER), however lacking reference values. We aim to determine reference values for the pediatric population and to correlate these values with age and postprandial/fasting period. Methods We evaluated MII/pH traces from patients (newborns, infants, and children) admitted to 3 Italian hospitals and who underwent MII/ pH for suspected GER disease. Patients with MII/pH traces that showed significant symptom-reflux associations and/or a pathological reflux index (> 6% for newborns and infants, > 3% for children) were excluded. Traces were analysed in their entirety, and in the postprandial period (first hour after a meal) and the fasting period (the following hours before the next meal) separately. Results A total of 195 patients (46 newborns, 83 infants, and 66 children) were included. Age positively correlated with frequency of acidic GER events (r = 0.37, P < 0.05) and negatively associated with weakly acidic GER events (r = 0.46, P < 0.05). Conclusions This study describes the distribution of MII/pH values in a pediatric population with normally acidic GER exposure and no significant association between GER events and symptoms. These MII/pH values may be used as reference values in clinical practice for a corrected GER disease diagnosis in the pediatric population. (J Neurogastroenterol Motil 2020;26:370-377)