136 research outputs found
Methodology for Optimal Sizing of Hybrid Power System Usingparticle Swarm Optimization and Dynamic Programming
AbstractA methodology for optimal sizing of hybrid battery-ultracapacitor power system (HPS) is presented. The purpose of the proposed methodology is to locate the optimal voltage levelfor HPS used in a plug-in hybrid electric vehicle (PHEV). A combined optimization framework for a HPS is proposed and the optimization problem is solved in a bi-level manner. The framework contains two nested optimization loops. The outer loop evaluates the selected parameters throughparticle swarm optimization (PSO) algorithm, while the inner loop generates the optimal control strategy and calculates the costs through dynamic programming (DP) algorithm. The Chinese Typical City Bus Drive Cycle (CTCBDC) has beenused to verify and evaluate the performance of the proposed methodology. The optimization result shows that higher voltage degree usually means better performance and the battery tends to provide a constant power for the HPS. It is noted that the constant powercloses to the high efficiency district of the battery and DC/DC convertor. After that the optimal result is further analyzed undervarious optimization goals andbattery charge/discharge current constrains
Energy Management Optimization for a Hybrid Tracked Vehicle Using the Radau Pseudospectral Method
AbstractThis study explored the feasibility of using the Radau pseudospectral method (RPM) to optimize the energy management strategy for a hybrid tracked vehicle. The engine–generator set and the battery pack of the serial hybrid tracked vehicle were modeled and validated through the bench test. A DC-DC converter was equipped between the battery pack and the DC bus in this hybrid powertrain, which increased the flexibility of energy distribution between the engine–generator set and the battery. The optimal control problem was formulated to minimize the fuel consumption through regulating the power distribution properly between the engine–generator set and battery pack during a typical driving schedule. The RPM was applied to transform the optimal control problem to a finite-dimensional constrained nonlinear programming problem. A comparison of the solutions from RPM and dynamic programming showed that the former offers the higher computation efficiency and better fuel economy
Ultra-compact Silicon Multimode Waveguide Bends Based on Special Curves for Dual Polarizations
The multimode waveguide bends (MWBs) with very compact sizes are the key
building blocks in the applications of different mode-division multiplexing
(MDM) systems. To further increase the transmission capacity, the silicon
multimode waveguide bends for dual polarizations are of particular interest
considering the very distinct mode behaviors under different polarizations in
the silicon waveguides. Seldom silicon MWBs suitable for both polarizations
have been studied. In this paper we analyze several dual-polarization-MWBs
based on different bending curve functions. These special curve-based silicon
MWBs have the advantages of easy fabrication and low loss compared with other
structures based on the subwavelength structures such as gratings. A comparison
is made between the free-form curve, Bezier curve, and Euler curve, which are
used in the bending region instead of a conventional arc. The transmission
spectra of the first three TE and TM modes in the silicon multimode waveguide
with a core thickness of 340 nm are investigated. The simulation results
indicate that in the premise of the same effective radius which is only 10 in
this paper, the 6-mode MWB based on the free-form curve has the optimal
performances, including an extremely low loss below 0.052dB and low crosstalk
below -25.97dB for all six modes in the wide band of 1500-1600 nm. The MWBs
based on the Bezier and Euler curve have degraded performances in terms of the
loss and crosstalk. The results of this paper provide an efficient design
method of the polarization insensitive silicon MWBs, which may leverage the
researches for establishing complicated optical transmission systems
incorporating both the MDM and polarization-division multiplexing (PDM)
technology.Comment: 18 page
Offline and Online Blended Machine Learning for Lithium-Ion Battery Health State Estimation
This article proposes an adaptive state of health (SOH) estimation method for lithium-ion batteries using machine learning. Practical problems with feature extraction, cell inconsistency, and online implementability are specifically solved using a proposed individualized estimation scheme blending offline model migration with online ensemble learning. First, based on the data of pseudo-open-circuit voltage measured over the battery lifespan, a systematic comparison of different incremental capacity features is conducted to identify a suitable SOH indicator. Next, a pool of candidate models, composed of slope-bias correction (SBC) and radial basis function neural networks (RBFNNs), are trained offline. For online operation, the prediction errors due to cell inconsistency in the target new cell are then mitigated by a proposed modified random forest regression (mRFR) based ensemble learning process with high adaptability. The results show that compared to prevailing methods, the proposed SBC-RBFNN-mRFR-based scheme can achieve considerably improved SOH estimation accuracy (15%) with only a small amount of early-age data and online measurements are needed for practical operation. Furthermore, the applicability of the proposed SBC-RBFNN-mRFR algorithms to real-world operation is validated using measured data from electric vehicles, and it is shown that a 38% improvement in estimation accuracy can be achieved
Self doping effect and successive magnetic transitions in superconducting SrVFeAsO
We have studied a quinary Fe-based superconductor SrVFeAsO by the
measurements of x-ray diffraction, x-ray absorption, M\"{o}ssbauer spectrum,
resistivity, magnetization and specific heat. This apparently undoped
oxyarsenide is shown to be self doped via electron transfer from the V
ions. We observed successive magnetic transitions within the VO layers: an
antiferromagnetic transition at 150 K followed by a weak ferromagnetic
transition at 55 K. The spin orderings within the VO planes are discussed
based on mixed valence of V and V.Comment: One Table and more references are adde
VLBI Astrometry of Radio Stars to Link Radio and Optical Celestial Reference Frames. I. HD 199178 AR Lacertae
To accurately link the radio and optical Celestial Reference Frames (CRFs) at
optical bright end, i.e., with Gaia G band magnitude < 13, increasing number
and improving sky distribution of radio stars with accurate astrometric
parameters from both Very Long Baseline Interferometry (VLBI) and Gaia
measurements are mandatory. We selected two radio stars HD 199178 and AR
Lacertae as the target for a pilot program for the frame link, using the Very
Long Baseline Array (VLBA) at 15 GHz at six epochs spanning about 1 year, to
measure their astrometric parameters. The measured parallax of HD 199178 is
mas and the proper motion is , , while the parallax of
AR Lac is mas and the proper motion is , . Our
VLBI measured astrometric parameters have accuracies about 4-5 times better
than the corresponding historic VLBI measurements and comparable accuracies
with those from Gaia, validating the feasibility of frame link using radio
stars. With the updated astrometric parameters for these two stars, there is a
25% reduction of the uncertainties on the Y axis for both orientation and spin
parameters.Comment: 11 pages, accepted by MNRAS on 2023 April 2
Gene co-expression network analysis identifies BRCC3 as a key regulator in osteogenic differentiation of osteoblasts through a β-catenin signaling dependent pathway
Objective(s): The prognosis of osteoporosis is very poor, and it is very important to identify a biomarker for prevention of osteoporosis. In this study, we aimed to identify candidate markers in osteoporosis and to investigate the role of candidate markers in osteogenic differentiation. Materials and Methods: Using Weighted Gene Co-Expression Network analysis, we identified three hub genes might associate with osteoporosis. The mRNA expression of hub genes in osteoblasts from osteoporosis patients or healthy donor was detected by qRT-PCR. Using siRNA and overexpression, we investigated the role of hub gene BRCC3 in osteogenic differentiation by alkaline phosphatase staining and Alizarin red staining. Moreover, the role of β-catenin signaling in the osteogenic differentiation was detected by using β-catenin signaling inhibitor XAV939.Results: We identified three hub genes that might associate with osteoporosis including BRCC3, UBE2N, and UBE2K. UBE2N mRNA and UBE2K mRNA were not changed in osteoblasts isolated from osteoporosis patients, compared with healthy donors, whereas BRCC3 mRNA was significantly increased. Depletion of BRCC3 promoted the activation of alkaline phosphatase and formation of calcified nodules in osteoblasts isolated from osteoporosis patients and up-regulated β-catenin expression. XAV939 reversed the BRCC3 siRNA-induced osteogenic differentiation. Additionally, inhibited osteogenic differentiation was also observed after BACC3 overexpression, and this was accompanied by decreased β-catenin expression.Conclusion: BRCC3 is an important regulator for osteogenic differentiation of osteoblasts through β-catenin signaling, and it might be a promising target for osteoporosis treatment
Strengthening Cooperation between University and Enterprise
This presentation was part of the session : Universities and Companies Highlight What Works!IACEE 11th World Conference on Continuing Engineering EducationDr. and Professor Jinnan Chen:
Professor, School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing, P.R.China. Fengchun Sun: Vice President at Beijing Institute of Technology (BIT), China.Development of continuing education program is an important approach that helps
establish consummation lifelong education system. The practice of developing continuing
education in cooperation between university and government, university and enterprise is
introduced in this paper. There are three parts: 1) delivering new high technology training
programs in collaboration with government and enterprises, 2) delivering engineering graduate
degree education programs for the working graduates and 3) establishing highly qualified
professional team for teaching in collaboration with enterprises. Both cooperating parties improved the quality of continuing education and sharpened the personnel training ability.Distance Learning and Professional Education ; International Association for Continuing Engineering Educatio
- …