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Sun, Shizhen,Zhang, Hongjuan,Wang, Xiaoji,Gao, Yan,Jin, Baoquan The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.10
In dual-motor drive systems, a supercapacitor is connected to a common direct current (DC) bus through a DC/DC converter for the storage and utilization of regenerative energy, which is an effective energy saving method. However, the uncoordinated control of this type of system results in undesirable power circulation and reduced energy utilization efficiency. In this paper, an optimal power tracking control strategy based on a power flow predictive model is proposed. The power flow of the system is analyzed and a power flow predictive model is established. In addition, an objective function is deduced from the perspective of optimal performance tracking and minimum grid side energy consumption. The reference power of a supercapacitor is obtained in real time under constraints. The power flows among the grid side, the motors, and the energy storage unit are fully coordinated to realize a reasonable energy distribution. Experimental results indicate that the energy utilization efficiency of the system is improved by 25.4% in comparison with double closed-loop control in one working period.
Yet another Hybrid Strategy for Auto-tuning SpMV on GPUs
Zhaohui Wang,Xiaojie Qiu,Aimin Zhang,Yichao Cheng,Yi Peng,Sun Sun 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.5
Sparse matrix-vector multiplication (SpMV) is a key linear algebra algorithm and is widely used in many application domains. Besides multi-core architecture, there is also extensive research focusing on accelerating SpMV on many-core Graphics Processing Units (GPUs). SpMV computations have many indirect and irregular memory accesses, and load imbalance could occur while mapping computations onto single-instruction, multiple-data (SIMD) GPUs. SpMV is highly memory bandwidth-bound, though GPUs have massive computational resources, the performance of SpMV on GPUs is still unsatisfying. In this paper, we present a new hybrid strategy for auto-tuning SpMV on GPUs. Our strategy combines the advantages of row-major storage and column-major storage. Like many other strategies, we reordered a given sparse matrix according to row lengths in decreasing order. In order to be more adaptive and efficient, we proposed a new hybrid Blocked CSR and JDS (BCJ) format based on original CSR and JDS. BCJ splits a sparse matrix into a denser part and a sparser part after reordering and uses different kernels to process the corresponding part. And we proposed corresponding auto-tuning framework to help transforming matrix and launching kernels according to the sparsity characteristics of the matrix. A CUDA implementation of BCJ outperforms the original formats significantly on a broad range of unstructured sparse matrices.
Feng, Chao,Song, Ruixi,Sun, Guohui,Kong, Ming,Bao, Zixian,Li, Yang,Cheng, Xiaojie,Cha, Dongsu,Park, Hyunjin,Chen, Xiguang American Chemical Society 2014 Biomacromolecules Vol.15 No.3
<P>We have designed and evaluated coacervate microcapsules-immobilized multilayer sodium alginate beads (CMs-M-ALG-Beads) for oral drug delivery. The CMs-M-ALG-Beads were prepared by immobilization of doxorubicin hydrochloride (DOX) loaded chitosan/carboxymethyl coacervate microcapsules (DOX:CS/CMCS-CMs) in the core and layers of the multilayer sodium alginate beads. The obtained CMs-M-ALG-beads exhibited layer-by-layer structure and rough surface with many nanoscale particles. The swelling characteristic and drug release results indicated that 4-layer CMs-M-ALG-Beads possessed favorable gastric acid tolerance (the swelling rate <5%, the cumulative drug release rate <3.8%). In small intestine, the intact DOX:CS/CMCS-CMs were able to rapidly release from CMs-M-ALG-Beads with the dissolution of ALG matrix. Ex vivo intestinal mucoadhesive and permeation showed that CMs-M-ALG-Beads exhibited continued growth for <I>P</I><SUB>app</SUB> values of DOX, which was 1.07–1.15 folds and 1.28–1.38 folds higher than DOX:CS:CMCS-CMs in rat jejunum and ileum, respectively, demonstrating that CMs-M-ALG-Beads were able to enhance the absorption of DOX by controlled releasing DOX:CS/CMCS-CMs and prolonging the contact time between the DOX:CS/CMCS-CMs and small intestinal mucosa.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2014/bomaf6.2014.15.issue-3/bm401890x/production/images/medium/bm-2013-01890x_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bm401890x'>ACS Electronic Supporting Info</A></P>
Microcapsules derived from Pickering emulsions as thermal latent curing accelerator for epoxy resins
Bowen Zhang,Yingying Zhao,Xin Sun,Xiaoma Fei,Weiwei Wang,Xiaojie Li,Xiaoya Liu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
Organic-inorganic hybrid microcapsules encapsulating 2-phenylimidazole (2-PhIm) were prepared byPickering emulsion polymerization of styrene and divinyl benzene using methacryloyloxy silanemodifiedsilica particles as the stabilizer, and served as a thermal latent curing accelerator fordiglycidylether of bisphenol A epoxy/anhydride system. The one-component curing compositioncontaining 5 wt% of the microcapsules exhibited an excellent storage stability. The pot life at roomtemperature was as long as 30 days, while which of 2-PhIm curing system was only 2 days. At elevatedtemperature, the encapsulated 2-PhIm could be released from microcapsules effectively, and instantlyaccelerated the curing reaction. Meanwhile, the addition of microcapsules did not cause an adverse effecton the thermomechanical performance of the epoxy thermosets. In addition, the latency and curingbehavior could be facilely regulated at a wide range of temperature by adjusting monomer ratios of thepolymer matrix, to match different process temperatures. The microcapsules with robust cross-linkedpolystyrene matrix structure also showed good resistance to shearing forces, indicating their feasibilityfor high-speed mixing or kneading process in practical applications. It is suggested that the novel latentcuring accelerator is potential for high-performance one-pot epoxy formulations, particularlyrecommended for application in electronic packagingfields.
Ginsenosides Rc, as a novel SIRT6 activator, protects mice against high fat diet induced NAFLD
Zehong Yang,Yuanyuan Yu,Nannan Sun,Limian Zhou,Dong Zhang,HaiXin Chen,Wei Miao,Weihang Gao,Canyang Zhang,Changhui Liu,Xiaoying Yang,Xiaojie Wu,Yong Gao The Korean Society of Ginseng 2023 Journal of Ginseng Research Vol.47 No.3
Background: Hepatic lipid disorder impaired mitochondrial homeostasis and intracellular redox balance, triggering development of non-alcohol fatty liver disease (NAFLD), while effective therapeutic approach remains inadequate. Ginsenosides Rc has been reported to maintain glucose balance in adipose tissue, while its role in regulating lipid metabolism remain vacant. Thus, we investigated the function and mechanism of ginsenosides Rc in defending high fat diet (HFD)-induced NAFLD. Methods: Mice primary hepatocytes (MPHs) challenged with oleic acid & palmitic acid were used to test the effects of ginsenosides Rc on intracellular lipid metabolism. RNAseq and molecular docking study were performed to explore potential targets of ginsenosides Rc in defending lipid deposition. Wild type and liver specific sirtuin 6 (SIRT6, 50721) deficient mice on HFD for 12 weeks were subjected to different dose of ginsenosides Rc to determine the function and detailed mechanism in vivo. Results: We identified ginsenosides Rc as a novel SIRT6 activator via increasing its expression and deacetylase activity. Ginsenosides Rc defends OA&PA-induced lipid deposition in MPHs and protects mice against HFD-induced metabolic disorder in dosage dependent manner. Ginsenosides Rc (20mg/kg) injection improved glucose intolerance, insulin resistance, oxidative stress and inflammation response in HFD mice. Ginsenosides Rc treatment accelerates peroxisome proliferator activated receptor alpha (PPAR-α, 19013)-mediated fatty acid oxidation in vivo and in vitro. Hepatic specific SIRT6 deletion abolished ginsenoside Rc-derived protective effects against HFD-induced NAFLD. Conclusion: Ginsenosides Rc protects mice against HFD-induced hepatosteatosis by improving PPAR-α-mediated fatty acid oxidation and antioxidant capacity in a SIRT6 dependent manner, and providing a promising strategy for NAFLD.
Bingbing Qiu,Guo-Feng Wang,Yun-Sheng Fan,Dong-Dong Mu,Xiaojie Sun 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.8
This paper investigates the path following control problem for underactuated unmanned surface vehicle(USV) in the presence of unmodeled dynamics, external disturbances and input saturation. A novel adaptive robustpath following control scheme is proposed by employing trajectory linearization control (TLC) technology andfinite-time disturbance observer, which is composed of a concise yaw rate controller and a surge speed controller. The salient features of the proposed scheme include: a path following guidance law is designed to ensure USVeffectively converging to and following the desired path; TLC is introduced into the field of USV motion controlas new effective technique, and it is the first time used to design path following controller for underactuated USV;a finite-time nonlinear tracking differentiator is constructed not only to avoid the signal jump caused by derivation,but also to filter noise and high frequency interference. A finite-time disturbance observer (FDO) is devised toexactly observe the uncertain dynamics and unknown external disturbances, which improves the tracking accuracyand precise disturbance rejection of the proposed controller; then, an auxiliary dynamic system that is governed bysmooth switching function is developed to compensate for the saturation constraint on actuator. Stability analysisverifies that all signals in the closed-loop system are uniformly ultimately bounded. Finally, simulation results andcomparisons illustrate the superiority of the proposed control scheme.
Qin, Shuanglin,Wang, Pan,Huang, Shuangping,Liu, Shuai,Wang, Gaopeng,Wang, Liping,Sun, Meng,Wang, Xiaoji Korean Chemical Society 2015 대한화학회지 Vol.59 No.6
The reductive amination of cyclohexanone with ammonia over Cu-Cr-a/γ-Al<sub>2</sub>O<sub>3</sub> was investigated. It was found that a proper solvent with high solubility of ammonia and 4Å molecular sieves for the elimination of generated water contributed to the formation of cyclohexylamine in the premixing process. In addition, the addition of ammonia in the fixedbed reactor could obviously improve the conversion of cyclohexanone to cyclohexylamine. Finally, reaction conditions including reaction temperature, hydrogen pressure and charging rate of the premix were optimized. Under the optimized conditions, cyclohexylamine was obtained in 83.06% yield.
Ultrafast epitaxial growth of metre-sized single-crystal graphene on industrial Cu foil
Xu, Xiaozhi,Zhang, Zhihong,Dong, Jichen,Yi, Ding,Niu, Jingjing,Wu, Muhong,Lin, Li,Yin, Rongkang,Li, Mingqiang,Zhou, Jingyuan,Wang, Shaoxin,Sun, Junliang,Duan, Xiaojie,Gao, Peng,Jiang, Ying,Wu, Xiaoson Elsevier 2017 Science bulletin Vol.62 No.15