Alexander Oliva

Massachusetts Institute of Technology

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Georg Wachtmeister

Technical University of Munich

G. Ambrosi

Istituto Nazionale di Fisica Nucleare, Sezione di Perugia

Xin Liu

Chinese Academy of Sciences

Weiran Cao

San’an Optoelectronics (China)

P. Betti

Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

J. Casaus

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

Congwei Liao

Peking University

L. Di Venere

Polytechnic University of Bari

Zhe Chen

Aalborg University

G. Bigongiari

University of Siena

Cooperative Institutions

Chinese Academy of Sciences

Istituto Nazionale di Fisica Nucleare

Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

Institute of High Energy Physics

University of Chinese Academy of Sciences

University of Florence

University of Trieste

Istituto Nazionale di Fisica Nucleare, Sezione di Trieste

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

Istituto Nazionale di Fisica Nucleare, Sezione di Bari

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Multi-source energy harvesting for lightweight applications

Alexander Oliva

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Experimental and simulative research advances in the piston assembly of an internal combustion engine

Tribology International (2016)

Claus Kirner Johannes Halbhuber Benedict Uhlig Alexander Oliva Stefan Graf

Piston (optics)

Piston ring

Crank

10.1016/j.triboint.2016.03.005

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Citations (31)

Numerical multiphase simulation and validation of the flow in the piston ring pack of an internal combustion engine

Tribology International (2016)

Alexander Oliva Stefan Held

Piston (optics)

Piston ring

10.1016/j.triboint.2016.04.003

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Citations (25)

General Analysis of Fibonacci Charge Pump SSL Output Characteristics With Parasitic Capacitances

IEEE Transactions on Power Electronics (2019)

Alexander Oliva Jeffrey H. Lang

A closed-form analytic formula for the output characteristics of a Fibonacci charge pump model in the slow-switching limit generalized to any number of switching capacitor stages is derived for the first time. The model incorporates bottom-plate and closed-switch parasitic capacitances. Thus, the derived formula gives insight into the effects of parasitics on the output characteristics and their deviation from the ideal, including the limit of the output resistance and gain as the number of stages grows to infinity. The limits of this generalized formula reduce to previously published results of special cases, and simulations confirm the results. The calculation complexity of the output characteristics using the model is completely independent of the size of the converter, whereas the computational complexity of previous works grows linearly with converter size.

Parasitic extraction

Infinity

10.1109/tpel.2019.2900468

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Performance assessment of the HERD calorimeter with a photo-diode read-out system for high-energy electron beams

arXiv (Cornell University) (2024)

O. Adriani G. Ambrosi M. Antonelli Yonglin Bai Xiaohong Bai

The measurement of cosmic rays at energies exceeding 100 TeV per nucleon is crucial for enhancing the understanding of high-energy particle propagation and acceleration models in the Galaxy. HERD is a space-borne calorimetric experiment that aims to extend the current direct measurements of cosmic rays to unexplored energies. The payload is scheduled to be installed on the Chinese Space Station in 2027. The primary peculiarity of the instrument is its capability to measure particles coming from all directions, with the main detector being a deep, homogeneous, 3D calorimeter. The active elements are read out using two independent systems: one based on wavelength shifter fibers coupled to CMOS cameras, and the other based on photo-diodes read-out with custom front-end electronics. A large calorimeter prototype was tested in 2023 during an extensive beam test campaign at CERN. In this paper, the performance of the calorimeter for high-energy electron beams, as obtained from the photo-diode system data, is presented. The prototype demonstrated excellent performance, e.g., an energy resolution better than 1% for electrons at 250 GeV. A comparison between beam test data and Monte Carlo simulation data is also presented.

Calorimeter (particle physics)

10.48550/arxiv.2410.03274

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Cogeneraciones de motores diesel con fuelóleo pesado

Energía: Ingeniería energética y medioambiental (1999)

Alexander Oliva

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Numerical Simulation of the Gas Flow through the Piston Ring Pack of an Internal Combustion Engine

SAE technical papers on CD-ROM/SAE technical paper series (2015)

Alexander Oliva Stefan Held Anatoli Herdt Georg Wachtmeister

Piston (optics)

Piston ring

Internal flow

10.4271/2015-01-1302

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Citations (10)

Performance assessment of the HERD calorimeter with a photo-diode read-out system for high-energy electron beams

Journal of Instrumentation (2025)

O. Adriani G. Ambrosi M. Antonelli Yonglin Bai Xiaohong Bai

Abstract The measurement of cosmic rays at energies exceeding 100 TeV per nucleon is crucial for enhancing the understanding of high-energy particle propagation and acceleration models in the Galaxy. HERD is a space-borne calorimetric experiment that aims to extend the current direct measurements of cosmic rays to unexplored energies, such as protons exceeding one PeV. The payload is scheduled to be installed on the Chinese Space Station in 2027. The primary peculiarity of the instrument is its capability to measure particles coming from all directions, with the main detector being a deep, homogeneous, 3D calorimeter. The active elements are read out using two independent systems: one based on wavelength shifter fibers coupled to CMOS cameras, and the other based on photo-diodes read-out with custom front-end electronics. A large calorimeter prototype was tested in 2023 during an extensive beam test campaign at CERN. In this paper, the performance of the calorimeter for high-energy electron beams, as obtained from the photo-diode system data, is presented. The prototype demonstrated excellent performance, e.g., an energy resolution better than 1% for electrons at 250 G e V. A comparison between beam test data and Monte Carlo simulation data is also presented.

Calorimeter (particle physics)

10.1088/1748-0221/20/02/p02015

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Kostensenkung durch Virtualisierung - Partikelbasierte CFD-Simulation einer Wasserdurchfahrt

ATZ - Automobiltechnische Zeitschrift (2024)

Kevin Posch Alexander Oliva Sanjin Šarić Herbert Annerer

10.1007/s35148-024-2123-9

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Numerical simulation of the multiphase flow phenomena in the crankcase of an internal combustion engine

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering (2017)

Alexander Oliva Georg Wachtmeister

The flow processes in the crankcase of an internal combustion engine are essential for many sub areas of a combustion engine. Piston cooling, oil transport through the main and conrod bearings or the tribology of the piston assembly are some of them and take place in the crankcase. The oil supply of the liner plays an important role for the friction losses of an engine. Additionally oil aerosols are emerging in the crankcase. The sizes of the droplets are crucial for the oil separator dimensioning. Due to blow-by a part of the crankcase gas flows back to the intake manifold (via the oil separator) and the containing oil in the flow is responsible for additional emissions of the engine. This study introduces a simulation method for the calculation of the multiphase flow phenomena in the crankcase of a four-cylinder diesel engine. All relevant effects have been identified and modeled numerically. The detailed geometry of the crankcase volume and all moving parts of the piston assembly have been considered in the model. To calculate the multiphase flow in the crankcase a discrete particle method has been chosen, where the gas flow is described continuously and the oil flow is modeled with the discrete droplet method. With this method the oil flow and the interaction with the gas flow can be calculated. The computational fluid dynamics results enable new insights into the crankcase flow of an internal combustion engine and therefore statements about the oil distribution in the crankcase can be made. That leads to further knowledge of the transport processes in the crankcase.

Crankcase

Piston (optics)

Separator (oil production)

10.1177/0954407016685194

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Citations (3)