The Inversion of the Real Kinematic Properties of Coronal Mass Ejections by Forward Modeling

The kinematic properties of coronal mass ejections (CMEs) suffer from the projection effects, and it is expected that the real velocity should be larger and the real angular width should be smaller than the apparent values. Several attempts have been tried to correct the projection effects, which however led to a too large average velocity probably due to the biased choice of the CME events. In order to estimate the overall influence of the projection effects on the kinematic properties of the CMEs, we perform a forward modeling of the real distributions of the CME properties, such as the velocity, the angular width, and the latitude, by requiring their projected distributions to best match the observations. Such a matching is conducted by Monte Carlo simulations. According to the derived real distributions, it is found that (1) the average real velocity of all non-full-halo CMEs is about 514 km s$^{-1}$, and the average real angular width is about 33$^\circ$, in contrast to the corresponding apparent values of 418 km s$^{-1}$ and 42.7$^\circ$ in observations; (2) For the CMEs with the angular width in the range of $20^\circ- 120^\circ$, the average real velocity is 510 km s$^{-1}$ and the average real angular width is 43.4$^\circ$, in contrast to the corresponding apparent values of 392 km s$^{-1}$ and 52$^\circ$ in observations.Comment: 8 pages, 4 figures, to be published in Res. Astron. Astrophys. (RAA

China’s Challenging the “Ricardo Law” Circle： Is world development inevitably antagonistic or conflictive

World historical development, especially the development of modern and contemporary globalization, tends to be antagonistic, conflictive and non-harmonious. Its theoretical demonstration is “Ricardo Law” circle, namely the rule that social productivity development and historical progress are at the expense of certain social classes and strata. Western countries after the Second World War have hence changed partly in certain ideas, productivity and specific regulations. Will China be fettered by “Ricardo Law” circle in our transformational socialism and has to apply the antagonistic, conflictive and non-harmonious method to achieve the alienating “development”? This paper analyzes the harmony and conflict thoughts and policies of the western economics represented by “Ricardo Law” in order to probe into our socialist social and economic harmony theory. Key words: Ricardo Law, harmony and conflict thoughts of western economics, Harmonious Society Theory Résumé: Le développement historique du monde, notamment le développement de la globalisation moderne et contemporaine, tend à s’avérer antagoniste, conflictuel et non harmonieux. La démonstration théorique est le cercle de la « loi de Ricardo », à savoir la règle que le développement de la force productive sociale et le progrès social sont aux dépens de certaines classes et souches sociales. Après le Seconde guerre mondiale, les pays occidentaux ont changé en partie certaines idées et des régulations spécifiques. Est-ce que la Chine sera enchaînée par la loi de Ricardo dans notre socialisme transformationnel et aura à appliquer la méthode antagoniste, conflictuelle et non harmonieuse pour accomplir le développement aliéné ? Le présent article analyse les pensées et politiques d’harmonie et de conflit des pays occidentaux, représentées par la loi de Ricardo, dans le but d’explorer la théorie d’harmonie économique et sociale socialiste de notre pays. Mots-Clés: loi de Ricardo, pensées d’harmonie et de conflit des pays occidentaux, théorie de la société harmonieus

An Advanced Simulation Framework of an Integrated Vehicle-Powertrain Eco-Operation System for Electric Buses

vities of transit buses traveling along arterial roads and city streets consist of frequent stops and idling events at many predictable occasions, e.g., loading/unloading passengers at bus stops, approaching traffic signals or stop signs, and going through recurrent traffic congestion, etc. Besides designing transit buses with electric powertrain systems that can save a noticeable amount of energy thanks to regenerative breaking, this urban traffic environment also unfolds a number of opportunities to further improve their energy efficiency via vehicle connectivity and autonomy. Therefore, this paper proposes a complete and novel simulation framework of integrated vehicle/powertrain eco-operation system for electric buses (Eco-bus) by co-optimizing the vehicle dynamics and powertrain (VD&PT) controls. A comprehensive evaluation of the proposed system on mobility benefits and energy savings has been conducted over various traffic conditions. Simulation results are presented to showcase the superiority of the proposed simulation framework of the Eco-bus compared to the conventional bus, particularly in terms of mobility and energy efficiency aspects

Characterizations and representations of left and right hybrid (b, c)-inverses in rings

Let R be an associative ring with unity 1 and let a, b ,c is an element of R. In this paper, several characterizations for left and right hybrid (b, c)-inverses of a are derived. Moreover, their formulae are given by regularities of certain elements. Then, we give characterizations of right (b, c)-inverses and right annihilator (b, c)-inverses of the product of three elements. Finally, relations among the right hybrid (b, c)-inverse of paq, the right (qb, c)-inverse of aq and the right annihilator (b, cp)-inverse of aq are given.This research is supported by the National Natural Science Foundation of China (No. 11801124), the Natural Science Foundation of Anhui Province (No. 1808085QA16), the Fundamental Research Funds for the Central Universities (No. JZ2018HGTB0233) and was partially financed by Portuguese Funds through FCT (Fundação para a Ciência e a Tecnologia) within the Projects UIDB/00013/2020 and UIDP/00013/2020

Comparative study of model updating methods using frequency response function data

Constructing accurate finite element models for engineering structures plays a key role in structural dynamic design and analysis. Finite element model updating using frequency response function data arises great attention. In this paper, a comparison of two model updating approaches by using frequency response function data is investigated. The first method is based on sensitivity analysis, which has been regarded as one of the most successful approaches in model updating. The second one is based on the representation of modeling errors as linear combinations of the individual element matrices, which can be used for both error locating and model updating. The basic formulations of these two methods are introduced and the possible solution strategies are discussed. Numerical simulations are conducted to compare the two model updating methods employing the GARTEUR Truss, two aspects effect on the updating solution including magnitude of initial modeling errors and the completeness of measured coordinates are studied. At last, an experimental cantilever beam is updated by adopting the sensitivity method with tested frequency response function, it is shown that the sensitivity method is effective even when the test data are extremely incomplete