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Emiliano Nicolás Jesser,Jorge Omar Werdin-González,Ana Paula Murray,Adriana Alicia Ferrero 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
Essential oils (EOs) have been recognized as an important source of biopesticides. This work investigated the chemical constituents and bioactivity of six essential oils namely lavender (Lavandula angustifolia Mill.), peppermint (Mentha piperita L.), geranium (Geranium maculatum L.), palmarosa (Cymbopogon martinii (Roxb.) Wats), eucalyptus (Eucalyptus globulus Labill.) and bergamot (Citrus bergamia Risso) against adults of the Indian meal moth, Plodia interpunctella, a cosmopolitan pest that infests a wide range of stored products. Analysis by gas chromatography coupled to mass spectrometry (GC–MS) revealed the presence of several compounds, mainly mono- and sesquiterpenes. The contact toxicity assay showed that the EO from palmarosa was the most toxic with a LD50 value of 22.8 μg cm−2. The toxicity order was palmarosa > geranium > peppermint > lavender > bergamot > eucalyptus. In fumigant toxicity assay, the greatest effect was found with the EO from eucalyptus with a KT50 value of 8.34 min. The toxicity order was eucalyptus > peppermint > geranium =lavender > bergamot > palmarosa. The EO from palmarosa showed the highest residual activity when the insects were exposure to its volatiles constituents. Finally, all EOs produce sublethal activity promoting effects in the fecundity. In conclusion, the EOs could be used as potential biopesticides for P. interpunctella control.
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Diletta Acuti,Ada Baldi,Romeo Bandinelli,Emiliano degl’Innocenti,Valentina Mazzoli,Margherita Tufarelli 글로벌지식마케팅경영학회 2015 Global Fashion Management Conference Vol.2015 No.06
This research aims to understand how an interdisciplinary approach could help Italian firms to enhance their offer to the market. In this perspective, authors have studied benefits and obstacles of an interdisciplinary research approach, by describing the case of RITRATTO, a project by University of Florence referents of various disciplines (agronomy, design, engineering, history and marketing).
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Model-based optimization of injection strategies for SI engine gas injectors
Stefano Beccari,Emiliano Pipitone,Marco Cammalleri,Giuseppe Genchi 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
A mathematical model for the prediction of the mass injected by a gaseous fuel solenoid injector for spark ignition (SI) engines hasbeen realized and validated through experimental data by the authors in a recent work [1]. The gas injector has been studied with particularreference to the complex needle motion during the opening and closing phases. Such motion may significantly affect the amount ofinjected fuel. When the injector nozzle is fully open, the mass flow depends only on the upstream fluid pressure and temperature. Thisphenomenon creates a linear relationship between the injected fuel mass and the injection time (i.e. the duration of the injection pulse),thus enabling efficient control of the injected fuel mass by simply acting on the injection time. However, a part of the injector flow chartcharacterized by strong nonlinearities has been experimentally observed by the authors [1]. Such nonlinearities may seriously compromisethe air-fuel mixture quality control and thus increase both fuel consumption and pollutant emissions (SI engine catalytic conversionsystems have very low efficiency for non-stoichiometric mixtures). These nonlinearities arise by he injector outflow area variation causedby needle impacts and bounces during the transient phenomena, which occur in the opening and closing phases of the injector. In thiswork, the mathematical model previously developed by the authors has been employed to study and optimize two appropriate injectionstrategies to linearize the injector flow chart to the greatest extent. The first strategy relies on injection pulse interruption and has beenoriginally developed by the authors, whereas the second strategy is known in the automotive engine industry as the peak and hold injection. Both injection strategies have been optimized through minimum injection energy considerations and have been compared in termsof linearization effectiveness. Efficient linearization of the injector flow chart has been achieved with both injection strategies, and a similarincrease in injector operating range has been observed. The main advantage of the pulse interruption strategy lies on its ease of implementationon existing injection systems because it only requires a simple engine electronic control unit software update. Meanwhile,the peak and hold strategy reveals a substantial lack of robustness and requires expressly designed injectors and electronic components toperform the necessary voltage commutation.
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A mathematical model for the prediction of the injected mass diagram of a S.I. engine gas injector
Marco Cammalleri,Emiliano Pipitone,Stefano Beccari,Giuseppe Genchi 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.11
A mathematical model of gaseous fuel solenoid injector for spark ignition engine has been realized and validated through experimental data. The gas injector was studied with particular reference to the complex needle motion during the opening and closing phases, which strongly affects the amount of fuel injected. As is known, in fact, when the injector nozzle is widely open, the mass flow depends only on the fluid pressure and temperature upstream the injector: this allows one to control the injected fuel mass acting on the “injection time” (the period during which the injector solenoid is energized). This makes the correlation between the injected fuel mass and the injection time linear, except for the lower injection times, where we experimentally observed strong nonlinearities. These nonlinearities arise by the injector outflow area variation caused by the needle bounces due to impacts during the opening and closing transients [1] and may seriously compromise the mixture quality control, thus increasing both fuel consumption and pollutant emissions, above all because the S.I. catalytic conversion system has a very low efficiency for non-stoichiometric mixtures. Moreover, in recent works [2, 3] we tested the simultaneous combustion of a gaseous fuel ( compressed natural gas, CNG, or liquefied petroleum gas, LPG) and gasoline in a spark ignition engine obtaining great improvement both in engine efficiency and pollutant emissions with respect to pure gasoline operation mode; this third operating mode of bi-fuel engines, called “double fuel” combustion, requires small amounts of gaseous fuel, hence forcing the injectors to work in the non-monotonic zone of the injected mass diagram, where the control on air-fuel ratio is poor. Starting from these considerations we investigated the fuel injector dynamics with the aim to improve its performance in the low injection times range. The first part of this paper deals with the realization of a mathematical model for the prediction of both the needle motion and the injected mass for choked flow condition, while the second part presents the model calibration and validation, performed by means of experimental data obtained on the engine test bed of the internal combustion engine laboratory of the University of Palermo.
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Xidong Wang,Emiliano Pereira,Iván M. Díaz,Jaime H. García-Palacios 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
Active vibration control via inertial mass actuators has been shown as an effective tool to significantly reduce human-induced vertical vibrations, allowing structures to satisfy vibration serviceability limits. However, a lot of practical obstacles have to be solved before experimental implementations. This has motivated simple control techniques, such as direct velocity feedback control (DVFC), which is implemented in practice by integrating the signal of an accelerometer with a band-pass filter working as a lossy integrator. This work provides practical guidelines for the tuning of DVFC considering the damping performance, inertial mass actuator limitations, such as stroke and force saturation, as well as the stability margins of the closed-loop system. Experimental results on a full scale steel-concrete composite structure (behaves similar to a footbridge) with adjustable span are reported to illustrate the main conclusions of this work.
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Francisco Yumbla,Seungjun Woo,Emiliano Quinones Yumbla,Tuan Luong,Hyungpil Moon 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
This paper aims to analyze the range of motions and characteristics of a quadruped robot for stair climbing and crossing over an obstacle. Humans have a higher range than quadruped animals due to longer legs. We can make fewer steps and reach the same distance, can climb stairs by two or three steps and not only one, and cross over high obstacles thanks to our leg range. However, stability is different because quadruped has four contact points, whereas humans have only. Quadrupeds maintain walking stability because their gravity center falls within the triangle of support from the three legs when one is up, but in the same condition, humans encounter a complex challenge to maintain equilibrium. We propose using these inherent characteristics of a quadruped robot for motion analysis of stair climbing by two or three steps and cross over a big obstacle while maintaining high stability in a quadruped robot. We aboard in the discussion significant aspects of leg dimensions and joint ranges with geometrical analysis to find the optimal position of the feet. The motion effectiveness was verified experimentally by implementing the motions from the preliminary tests to a quadruped robot.
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Wang, Xidong,Pereira, Emiliano,Diaz, Ivan M.,Garcia-Palacios, Jaime H. Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
Active vibration control via inertial mass actuators has been shown as an effective tool to significantly reduce human-induced vertical vibrations, allowing structures to satisfy vibration serviceability limits. However, a lot of practical obstacles have to be solved before experimental implementations. This has motivated simple control techniques, such as direct velocity feedback control (DVFC), which is implemented in practice by integrating the signal of an accelerometer with a band-pass filter working as a lossy integrator. This work provides practical guidelines for the tuning of DVFC considering the damping performance, inertial mass actuator limitations, such as stroke and force saturation, as well as the stability margins of the closed-loop system. Experimental results on a full scale steel-concrete composite structure (behaves similar to a footbridge) with adjustable span are reported to illustrate the main conclusions of this work.
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Potential for probing three-body decays of Long-Lived Particles with MATHUSLA
Ibarra, Alejandro,Molinaro, Emiliano,Vogl, Stefan Elsevier 2019 Physics letters: B Vol.789 No.-
<P><B>Abstract</B></P> <P>Several extensions of the Standard Model predict the existence of Long-Lived Neutral Particles (LLNPs) with masses in the multi-GeV range and decay lengths of O ( 100 m ) or longer. These particles could be copiously produced at the LHC, but the decay products cannot be detected with the ATLAS or CMS detectors. MATHUSLA is a proposed large-volume surface detector installed near ATLAS or CMS aimed to probe scenarios with LLNPs which offers good prospects for disentangling the physics underlying two-body decays into visible particles. In this work we focus on LLNP decays into three particles with one of them being invisible, which are relevant for scenarios with low scale supersymmetry breaking, feebly interacting dark matter or sterile neutrinos, among others. We analyze the MATHUSLA prospects to discriminate between two- and three-body LLNP decays, as well as the prospects for reconstructing the underlying model parameters.</P>
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