Alternative Properties in Liquid Fuels and Blends

This work summarises the results of the research program at the Renewable Energy Group (GER) of the University of Buenos Aires on alternative properties for the characterization of liquid fuels. The study included fossil fuels: diesel fuel, gasoline, and methanol, and biofuels: biodiesel from different feedstocks and bioethanol. Blends of diesel fuel/biodiesel, gasoline/bioethanol, gasoline/methanol, biodiesel/butanol, and diesel fuel/biodiesel/butanol were also studied. The electrical, acoustical, and optical properties of fuels and blends were determined as a function of temperature and composition. From these results, the composition of blends was accurately estimated from measurements of permittivity and temperature. The research program included the study of correlations of the alternative properties with those indicated in the international quality standards for liquid fuels (kinematic viscosity, methanol content, flash point). These correlations make possible to verify the quality of liquid fuels with simpler and more convenient measurements in industrial settings, and also in the laboratory.Fil: Romano, Silvia Daniela. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Ingeniería Mecánica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Tecnologías del Hidrogeno y Energias Sostenibles. Universidad de Buenos Aires. Facultad de Ingeniería. Instituto de Tecnologías del Hidrogeno y Energias Sostenibles; ArgentinaFil: Sorichetti, P. A.. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Física; Argentin

Phosphorus retention and transformation in a dammed reservoir of the Thames River, Ontario: Impacts on phosphorus load and speciation

Extensive efforts are underway to reduce phosphorus (P) export from the Lake Erie watershed. On the Canadian side, the Thames River is the largest tributary source of P to Lake Erie’s western basin. However, the role of dams in retaining and modifying riverine P loading to the lake has not been comprehensively evaluated. We assessed whether Fanshawe Reservoir, the largest dam reservoir on the Thames River, acts as a source or sink of P, using year-round discharge and water chemistry data collected in 2018 and 2019. We also determined how in-reservoir processes alter P speciation by comparing the dissolved reactive P to total P ratio (DRP:TP) in upstream and downstream loads. Annually, Fanshawe Reservoir was a net sink for P, retaining 25% (36 tonnes) and 47% (91 tonnes) of TP in 2018 and 2019, respectively. Seasonally, the reservoir oscillated between a source and sink of P. Net P release occurred during the spring of 2018 and the summers of 2018 and 2019, driven by internal P loading and hypolimnetic discharge from the dam. The reservoir did not exert a strong influence on DRP:TP annually, but ratio increases occurred during both summers, concurrent with water column stratification. Our analysis demonstrates that Fanshawe Reservoir is not only an important P sink on the Thames River, but also modulates the timing and speciation of P loads. We therefore propose that the potential of using existing dam reservoirs to attenuate downstream P loads should be more thoroughly explored alongside source based P mitigation strategies.Canada-Ontario Agreement on Great Lakes Water Quality and Ecosystem Health || Canada First Research Excellence Fund through the Lake Futures project of the Global Water Futures

An innovative approach to compact calorimetry in space, NEUCAL

Abstract Neutron emission during the development of hadronic showers can be used to discriminate between electromagnetic and hadronic interacting particles impinging a calorimeter. A neutron detector based on a high efficiency 'active moderator' is presented and its performance is evaluated with the aid of Monte Carlo simulation

Parametric modeling of wideband piezoelectric polymer sensors:Design for optoacoustic applications

In this work, we present a three-dimensional model for the design of wideband piezoelectric polymer sensors which includes the geometry and the properties of the transducer materials. The model uses FFT and numerical integration techniques in an explicit, semi-analytical approach. To validate the model, we made electrical and mechanical measurements on homemade sensors for optoacoustic applications. Each device was implemented using a polyvinylidene fluoride thin film piezoelectric polymer with a thickness of 25 μm. The sensors had detection areas in the range between 0.5 mm2 and 35 mm2 and were excited by acoustic pressure pulses of 5 ns (FWHM) from a source with a diameter around 10 μm. The experimental data obtained from the measurements agree well with the model results. We discuss the relative importance of the sensor design parameters for optoacoustic applications and we provide guidelines for the optimization of devices.Fil: Fernández Vidal, A.. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: Ciocci Brazzano, Ligia. Universidad de Buenos Aires. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Matteo, Claudia Leda. Universidad de Buenos Aires. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Sorichetti, Patricio Aníbal. Universidad de Buenos Aires. Facultad de Ingeniería; ArgentinaFil: González, Martín Germán. Universidad de Buenos Aires. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Kekule Structure Counting of Single-Walled Boron Nitride Nanotube

氮化硼纳米管(BoronNitrideNanotube)、碳纳米管(CarbonNanotube)以及多环芳烃（PolycyclicAromaticHydrocarbon）等巨大共轭分子，是结构化学的重要研究对象。从图论角度来描述这些大分子的共轭分子系统(包括六角系统)的理论和计算，已得到了很大的发展。但随着所研究分子规模（立体或平面）的增大，手工计算无疑已变得十分艰巨甚至不可胜任。随着计算机软硬件技术的发展，可以设计一个辅助软件研究平台，为研究较大规模分子系统提供便利。我们将以图论与结构化学中相关的现有理论研究结果为基础，结合现代软件技术，提出对这些大分子系统的Kekule结构计数问题的计算...Gigantic conjugated molecules, such as Boron Nitride Nanotubes, Carbon Nanotubes, and Polycyclic Aromatic Hydrocarbons, are important research subjects of structural chemistry. Theories and caculations on conjugated molecule system(include hexagonal system), which is used to represent mathematically these gigantic molecules in organic chemistry, are well developed in recent years. When the size of...学位：工学硕士院系专业：计算机与信息工程学院自动化系_控制理论与控制工程学号：20003100