检索结果-南通市图书馆

Nano Research 2015年第12期8卷 3972-3981页

作者： Giampiero Amato Gianluca Milano umberto vignolo Ettore Vittone Quantum Research Laboratory INRIM Strada delle Cacce 91 Torino Italy Department of Physics NIS Research Center University of Torino via Pietro Giuria 1 10125 Torino Italy

The effect of laser irradiation on chemically vapor deposited （CVD） graphene was studied by analyzing the temporal evolution of Raman spectra acquired under various illumination conditions. The spectra showed that the normalized intensity of the defect-related peak increases with the square root of the exposure time and varies almost linearly with the laser power density. Furthermore, the hardness of graphene to radiation damage depends on its intrinsic structural quality. The results suggest that, contrary to the common belief, micro-Raman spectroscopy cannot be considered a noninvasive tool for the characterization of graphene. The experimental observations are compatible with a model that we derived from the interpretative approach of the Staebler-Wronski effect in hydrogenated amorphous silicon; this approach assumes that the recombination of photoexcited carriers induces the breaking of weak C-C bonds.

关键词： chemically vapor deposited (CVD) graphene Raman spectroscopy defect kinetics laser irradiation

Online Unbalance Detection and Diagnosis on Large Flexible Rotors by SVR and ANN trained by Dynamic Multibody Simulations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Dynamics, Monitoring and Diagnostics 2022年第3期1卷 139-147页

作者： Oscar García Peyrano Juan vignolo Rodrigo Mayer Matías Marticorena Balseiro Institute Cuyo National UniversitySan Carlos de BarilocheArgentina GPSignal San Carlos de BarilocheArgentina Vibrations Laboratory Vibration DivisionNational Atomic Energy CommissionSan Carlos de BarilocheArgentina

Multiple-stage steam turbine generators,like those found in nuclear power plants,pose special challenges with regards to mechanical unbalance *** factors contribute to a complex vibrational response,which can lead to incorrect assessments if traditional condition monitoring strategies are used without considering the mechanical system as a ***,in turn,can lead to prolonged machinery *** machine learning techniques can be used to integrally correlate mechanical unbalance along the shaft with transducer signals from rotor ***,this type of machinery has scarce data regarding faulty ***,a variety of fault conditions can be simulated in order to generate these data using computational models to simulate the dynamic response of individual *** the present work,a multibody model of a 640MWsteam turbine flexible rotor is employed to simulate mechanical unbalance in several positions along the *** components of the resulting vibration signals at each bearing are obtained and utilized as training data for two regression models designed for mechanical unbalance *** first approach uses an artificial neural network and the second one utilizes a support vector regression *** order to test their performance,the stiffness of each bearing in the multibody simulation was altered between 50%and 150%of the training model values,random noise was added to the signal and several dynamic unbalance conditions were *** show that both approaches can reliably diagnose dynamic rotor unbalance even when there is a typical degree of uncertainty in bearing stiffness values.

关键词： condition monitoring mechanical unbalance machine learning steam turbine

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

热浸镀锌作业线最新进展

钢铁 2004年第7期39卷 51-53页

作者： L.vignolo 达涅利威恩联合公司

将镀锌作业线与酸洗或彩涂作业线合并为一条联合作业线 ,是一种降低成本。

关键词：热浸镀锌联合作业线技术方案酸洗彩涂

Projected Long-Term Behavior of the CO2 Emission Factor in the Electricity System of Uruguay

在线全文

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2014年第12期8卷 2027-2038页

作者： Fernanda Maciel Mario vignolo Ruben Chaer IMFIA (Institute of Fluids Mechanics and Environmental Engineering) Universidad de la Republica Montevideo ZIP 11300Uruguay HE (Institute of Electric Engineering) Universidad de la Republica Montevideo ZIP 11300 Uruguay

Estimating CO2 emission factor of the electricity system is a key aspect in the calculation of the baseline emissions for projects certified as CDM （Clean Development Mechanism）, which replace energy from the grid. Currently, Uruguay is driving the expansion of the electricity system based on domestic renewable energies, in addition to replacing oil-based fuels for others with lower emission factors. This implies a substantial change of the generation park in the next decade and of the associated CO2 emissions. In this paper, a calculation methodology of the baseline emissions is adapted for its incorporation in the software SimSEE （Electric Energy Systems Simulator）, which is used for modeling the Uruguayan electric system, and therefore, allows modeling the current energy generator park and the future one. Using this tool, the CO2 emission factor＇s evolution is evaluated in the 2012-2020 period. The 2020 scenario is based on an optimal expansion of the electric system. The results indicate a strong reduction of the emission factor between 2012 and 2020, going from average values （for 100 simulations） around 0.60 tCO2/MWh to 0.15 tCO2/MWh. In this possible future scenario, CDM certification will probably not act as a strong incentive in Uruguay for the development of projects based on non-traditional renewable energies.

关键词： Carbon emissions electric system clean development mechanism future energy scenario.

首钢新建达涅利6辊3C轧机冷轧设计创新概念

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

钢铁 2004年第6期39卷 51-54页

作者： L.vignolo G.DelFrate 达涅利威恩联合公司

通过轧辊的交叉和轴向窜动的独创设计 ,达涅利 6辊 3CTM轧机实现了超大范围控制。除了中间辊弯辊和工作辊的正负弯辊外 ,轧机会在处于临界轧制状态时自动执行中间辊交叉。此外 ,机座还配备了工作辊轴向窜动 ,以便有效地控制带钢边部减... 详细信息

通过轧辊的交叉和轴向窜动的独创设计 ,达涅利 6辊 3CTM轧机实现了超大范围控制。除了中间辊弯辊和工作辊的正负弯辊外 ,轧机会在处于临界轧制状态时自动执行中间辊交叉。此外 ,机座还配备了工作辊轴向窜动 ,以便有效地控制带钢边部减薄。轧制力的有利分布 ,也优化了工作辊的磨损 ,从而降低了生产成本 ,提高了效率。

关键词：中间辊交叉板形控制

在线全文

学校读者我要写书评

暂无评论

满足航空应用对电阻性能的新需求

今日电子 2014年第9期 34-36页

作者： Dominique vignolo Vishay公司

推动飞机制造商的两个主要因素是提高燃油效率和符合防治污染的法规。为了提高燃油效率,电子设备被挪到靠近工作区的位置,通过减少电缆用量,达到减轻飞机重量的目的。为符合防治污染法规的要求,在地面上会使用电动引擎来移动飞机。然后... 详细信息

推动飞机制造商的两个主要因素是提高燃油效率和符合防治污染的法规。为了提高燃油效率,电子设备被挪到靠近工作区的位置,通过减少电缆用量,达到减轻飞机重量的目的。为符合防治污染法规的要求,在地面上会使用电动引擎来移动飞机。然后,这些变化对包括电阻在内的电子元器件的性能提出了新的需求。在本文里,我们将讨论用于航空应用的不同类型的电阻,从启动电阻,到高精度片式电阻和电阻网络,以及所要求的性能参数,包括在苛刻工作条件下的耐高温能力、长期稳定性、低TCR和严格的公差。

关键词：电阻性能航空应用飞机制造商防治污染燃油效率电子元器件耐高温能力长期稳定性

在线全文

学校读者我要写书评

暂无评论

满足航空应用对电阻性能的新需求

今日电子 2014年第8期 32-35页

作者： Dominique vignolo Vishay公司

推动飞机制造商的两个主要因素是提高燃油效率和符合防治污染的法规。为了提高燃油效率,电子设备被挪到靠近工作区的位置,通过减少电缆用量,达到减轻飞机重量的目的。为符合防治污染法规的要求,在地面上会使用电动引擎来移动飞机。

关键词：燃油效率飞机制造商飞机重量工作区电阻性防治污染电子设备启动电阻降额标称功率