258 research outputs found
Social Responsibility Or Development Responsibility - What Is the Environmental Impact of Chinese Investments in Africa: What Are Its Drivers, and What Are the Possibilities for Action
Social Responsibility Or Development Responsibility - What Is the Environmental Impact of Chinese Investments in Africa: What Are Its Drivers, and What Are the Possibilities for Action
Hopf bifurcation and stability analysis of flexible rotor-bearing system
Analytical model of a long bearing was used to study the self-excited vibration of a single disc flexible rotor-bearing system on sliding bearing support. A shooting method was applied to track and acquire periodic solution of flexible rotor system after the Hopf bifurcation. Stability of periodic solution was analyzed on the basis of Floquet theory. Gas film eddying, oscillation and other nonlinear features were considered. High-speed air hybrid bearing test-bed was used to verify gas film oscillation arising from coupling between natural frequency and gas film eddying frequency. The “bounded” nature of chaotic vibration and the process of rubbing caused by instability of air film were observed. Finally, a distinguishing criterion named “practical stability” was provided
Research on static and dynamic characteristics of a compound bearing with tilting pads and rolling bearing
According to the high stiffness requirement of bearings on spindle systems of precision machine tools, a kind of compound bearing composed of tilting pads and rolling bearing is proposed in this paper. In the start and stop process, the weight of rotor parts is borne by the rolling bearing, and the tilting pads avoid wear. When the spindle is reaching a certain speed, the rolling elements is disengaged from the outer ring of the rolling bearing, and the load is carried by the tilting pad bearing alone. The pivot position of the tilting pads can be defined by two characteristic parameters: Radial Pivot Position Coefficient (RPPC) and Circumferential Pivot Position Coefficient (CPPC). The influence laws of the pivot position parameters on the performance of compound bearing are synthetically analyzed. The results show that the stiffness of compound bearing can be effectively improved by proper design of the two pivot position parameters. The theoretical researches on this new compound bearing in this paper provide reference for bearing design of high stiffness spindle system
Simulated identification on dynamic characteristics of large heavy-load bearing
It’s difficult to test repeatedly for large heavy-load bearings (LHLBs) with full-scale and real load due to complexity and costliness, so simulated identification on dynamic characteristics of 1750 MW nuclear generator bearing with diameter 800 mm and specific pressure 3.3 MPa is provided in this paper. The identification model of bearing dynamic characteristic is established, the calculating method of positive and negative dynamic problems is provided, and effects of signal disturbances on identification precision are analyzed. The results show that the LHLBs’ permitted displacement disturbance should not be over 5 μm and the permitted ratio of dynamic load and static load is about 1 %-2 %, which is different from common knowledge of 15 %-20 % for small light-load bearings. If identification error of the main stiffness and main damping coefficients is less than 5 %, the amplitude of periodical disturbance of the dynamic load and displacement signals should be less than 5 %. If identification error of the main damping coefficients is less than 10 %, the phase of these two signals should be less than 1°. The roundness error and rotation error of the large shaft should be eliminated
Happiness Maximizing Sets under Group Fairness Constraints (Technical Report)
Finding a happiness maximizing set (HMS) from a database, i.e., selecting a
small subset of tuples that preserves the best score with respect to any
nonnegative linear utility function, is an important problem in multi-criteria
decision-making. When an HMS is extracted from a set of individuals to assist
data-driven algorithmic decisions such as hiring and admission, it is crucial
to ensure that the HMS can fairly represent different groups of candidates
without bias and discrimination. However, although the HMS problem was
extensively studied in the database community, existing algorithms do not take
group fairness into account and may provide solutions that under-represent some
groups.
In this paper, we propose and investigate a fair variant of HMS (FairHMS)
that not only maximizes the minimum happiness ratio but also guarantees that
the number of tuples chosen from each group falls within predefined lower and
upper bounds. Similar to the vanilla HMS problem, we show that FairHMS is
NP-hard in three and higher dimensions. Therefore, we first propose an exact
interval cover-based algorithm called IntCov for FairHMS on two-dimensional
databases. Then, we propose a bicriteria approximation algorithm called
BiGreedy for FairHMS on multi-dimensional databases by transforming it into a
submodular maximization problem under a matroid constraint. We also design an
adaptive sampling strategy to improve the practical efficiency of BiGreedy.
Extensive experiments on real-world and synthetic datasets confirm the efficacy
and efficiency of our proposal.Comment: Technical report, a shorter version to appear in PVLDB 16(2
2DMatPedia: An open computational database of two-dimensional materials from top-down and bottom-up approaches
Two-dimensional (2D) materials have been a hot research topic in the last
decade, due to novel fundamental physics in the reduced dimension and appealing
applications. Systematic discovery of functional 2D materials has been the
focus of many studies. Here, we present a large dataset of 2D materials, with
more than 6,000 monolayer structures, obtained from both top-down and bottom-up
discovery procedures. First, we screened all bulk materials in the database of
Materials Project for layered structures by a topology-based algorithm, and
theoretically exfoliate them into monolayers. Then, we generated new 2D
materials by chemical substitution of elements in known 2D materials by others
from the same group in the periodic table. The structural, electronic and
energetic properties of these 2D materials are consistently calculated, to
provide a starting point for further material screening, data mining, data
analysis and artificial intelligence applications. We present the details of
computational methodology, data record and technical validation of our publicly
available data (http://www.2dmatpedia.org/)
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