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RISS 인기검색어
- 검색키워드
- 저자 : Hongyu Zhang (검색결과 56 건)
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Review on State of Charge Estimation Methods for Li-Ion Batteries
Zhang, Xiaoqiang,Zhang, Weiping,Li, Hongyu,Zhang, Mao The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.3
The state of charge (SOC) is an important parameter in a battery-management system (BMS), and is very significant for accurately estimating the SOC of a battery. Li-ion batteries boast of excellent performance, and can only remain at their best working state by means of accurate SOC estimation that gives full play to their performances and raises their economic benefits. This paper summarizes some measures taken in SOC estimation, including the discharge experiment method, the ampere-hour integral method, the open circuit voltage method, the Kalman filter method, the neural network method, and electrochemical impedance spectroscopy (EIS. The principles of the various SOC estimation methods are introduced, and their advantages and disadvantages, as well as the working conditions adopted during these methods, are discussed and analyzed.
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Hongyu Zhang,Ling Chen,Baogang Xu,Ping Yang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
The strong band-to-band visible light absorption obtained by changing the bandgap of photocatalysts isdesirable but challenging for TiO2. In this paper, a mechanochemical pre-reaction and subsequent heattreatmentprocess were used to create TiO2/g-C3N4 heterojunctions. Acid-treated H2Ti3O7 nanobelts andsuperior thin g-C3N4 nanosheets (CN) were ground evenly and further heat-treated to grow rhombic TiO2in situ on the nanosheets. The heterojunctions exhibited a band gap with the absorption in visible lightregion. Heterojunction formation effective tunes the surface and electronic structures of the composite,resulting in significant decrease of bandgap. g-C3N4-based heterojunctions (5TCN) exhibited excellent H2generation (4991 lmol/g/h) and NO removal. In contrast, a TiO2-based composite (95TCN) revealed efficientphoto reduction of Cr(Ⅵ) which was 2 times of that of TiO2 sample and 22 times of that of CN. Thephotochemical reaction mechanism of TiO2 and g-C3N4-based composites was discussed with the ratio ofTiO2 and g-C3N4. The excellent performance is ascribed to single crystal rhombic TiO2 nanoparticlesgrown in situ on g-C3N4 to form well-developed heterojunctions which accelerate the carrier transfer. These results inspire the electronic structure engineering of photocatalysts to improve visible lightabsorption and provide a magic strategy for excellent photochemical activities.
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Review on State of Charge Estimation Methods for Li-Ion Batteries
Xiaoqiang Zhang,Wei-ping Zhang,Hongyu Li,Mao Zhang 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.3
The state of charge (SOC) is an important parameter in a battery-management system (BMS), and is very significantfor accurately estimating the SOC of a battery. Li-ion batteries boast of excellent performance, and can only remainat their best working state by means of accurate SOC estimation that gives full play to their performances and raisestheir economic benefits. This paper summarizes some measures taken in SOC estimation, including the dischargeexperiment method, the ampere-hour integral method, the open circuit voltage method, the Kalman filter method,the neural network method, and electrochemical impedance spectroscopy (EIS. The principles of the various SOCestimation methods are introduced, and their advantages and disadvantages, as well as the working conditionsadopted during these methods, are discussed and analyzed.
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Enhanced postoperative cancer therapy by iron-based hydrogels
Haomeng Zhang,Meng Zhang,Xinyu Zhang,Yuan Gao,Yanling Ma,Hongyu Chen,Jipeng Wan,Changzhong Li,Fei Wang,Xiao Sun 한국생체재료학회 2022 생체재료학회지 Vol.26 No.2
Surgical resection is a widely used method for the treatment of solid tumor cancers. However, the inhibition of tumor recurrence and metastasis are the main challenges of postoperative tumor therapy. Traditional intravenous or oral administration have poor chemotherapeutics bioavailability and undesirable systemic toxicity. Polymeric hydrogels with a three-dimensional network structure enable on-site delivery and controlled release of therapeutic drugs with reduced systemic toxicity and have been widely developed for postoperative adjuvant tumor therapy. Among them, because of the simple synthesis, good biocompatibility, biodegradability, injectability, and multifunctionality, ironbased hydrogels have received extensive attention. This review has summarized the general synthesis methods and construction principles of iron-based hydrogels, highlighted the latest progress of iron-based hydrogels in postoperative tumor therapy, including chemotherapy, photothermal therapy, photodynamic therapy, chemo-dynamic therapy, and magnetothermal-chemical combined therapy, etc. In addition, the challenges towards clinical application of iron-based hydrogels have also been discussed. This review is expected to show researchers broad perspectives of novel postoperative tumor therapy strategy and provide new ideas in the design and application of novel iron-based hydrogels to advance this sub field in cancer nanomedicine.
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Xiu-Zhen Zhang,Ling Wang,Dongwu Liu,Guang-Yan Tang,Hongyu Zhang 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.9
This study aims at evaluating the anticancer effects of berberine hydrochloride (berberine) and d-limonene, alone and in combination, on human gastric carcinoma cell line MGC803 to determine whether berberine and d-limonene work synergistically and elucidate their mechanisms. MGC803 cells were treated with berberine and d-limonene, alone and in combination, for 24–48 h. The inhibitory effects of these drugs on growth were determined by MTT assay. The combination index and drug reduction index were calculated with the Chou–Talalay method based on the median-effect principle. Flow cytometry and laser scanning confocal microscopy were employed to evaluate the effects of both drugs on cell-cycle perturbation and apoptosis, generation of reactive oxygen species (ROS), mitochondrial membrane potential, and expression of Bcl-2 and caspase-3 in MGC803 cells. Berberine or d-limonene alone can inhibit the growth of MGC803 cells in a doseand time-dependent manner. Berberine and d-limonene at a combination ratio of 1:4 exhibited a synergistic effect on anti-MGC803 cells. The two drugs distinctly induced intracellular ROS generation, reduced the mitochondrial transmembrane potential (DCm), enhanced the expression of caspase-3, and decreased the expression of Bcl-2. The combination of berberine and d-limonene showed more remarkable effects compared with drugs used singly in MGC803 cells. The combination of berberine and d-limonene exerted synergistic anticancer effects on MGC803 cells by cell-cycle arrest, ROS production, and apoptosis induction through the mitochondria-mediated intrinsic pathway.
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Hongyu Wu,Yuling Zhang,Shaoze Yan 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5
We studied the methods that are used for analyzing and optimizing the dynamic performance of mechanical systems in the startup stage under different driving functions. Especially, we considered the effects of joint clearance and component flexibility. The dynamic model of mechanical system is the basis of our methods. A higher order polynomial was used for describing the driving form of mechanical system, and the initial jerk and accelerating time length were employed to determine the specific driving function. Besides, we presented three performance evaluation parameters for mechanical system and introduced surrogate models to improve performance evaluation efficiency. Then, the optimal driving function was determined by using the surrogate models and a multi-objective optimization algorithm. Finally, a planar slider-crank mechanism with a clearance joint was taken as an example to demonstrate our methods.
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Hongyu Fu,Tao Zhang,Abulikemu Abulizi,Kenji Okitsu,Yalkunjan Tursun 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
It is pressing to explore highly efficient and broad-spectrum photocatalysts to address environmentalissues. In this work, in situ self-assembled hollow BiOIxCly n-n type heterojunction microspheres weresimply synthesized via a one-step hydrothermal method, and the microstructure, morphology, optical,photoelectrochemical, and photocatalytic properties of the samples were researched. The photocatalyticactivity of materials was investigated for Rhodamine B (RhB) degradation and CO2 reduction. The characterizationresults illustrated that the introduction of moderate amounts of Cl in BiOI could promotethe conversion of RhB and CO2, and it improved separation efficiency of photogenerated electrons andholes in BiOI. Specially, when the doping ratio of I and Cl was 2:1, BiOIxCly exhibited the most outstandingphotocatalytic activity for RhB degradation (99.42 %, 20 min) and reduction of CO2 to methanol(1042.12 lmol/gcat, 8 h) and ethanol (264.53 lmol/gcat, 8 h), which were approximately 3.40 and 3.91-times larger than that of BiOI, respectively. This study could describe a potential strategy for assistingwith environmental purification and energy transformation.
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Effect of MMP-2 & -9 on the Improvement of Mouse Pregnancy Potential
Shimin Zhang,Ayman Mesalam,Myeong-don Joo,Ji-Yoon Hwang,Seon-hwa Oh,Muhammad Idress,Hongyu Liu,Il-Keun Kong 한국동물생명공학회(구 한국동물번식학회) 2018 발생공학 국제심포지엄 및 학술대회 Vol.2018 No.06
Matrix metalloproteinases (MMPs) comprise a family of zinc-dependent proteinases. Proteins of the MMPs family are involved in the breakdown of extracellular matrix in normal physiological processes, such as embryonic development. Successful implantation is closely linked to the expression of MMPs which greatly influences ability of an embryo to degrade the basement membrane of the uterine epithelium, mainly composed of type IV collagen, and invade the uterine stroma. The purpose of this study was to determine the MMP-2 & -9, also known as type IV collagenase, concentrations in mouse uterine fluid during implantation window, investigate the roles of MMP-2 & -9 on mouse trophoblastic cells invasion in vitro and study the effect of MMP-2 & -9 cotransfer with mouse embryos on reproductive performances. Protein level was detected by Elisa kit and invasiveness was assessed by an invasion assay. Optimal concentrations of MMP-2 and -9 was co-transferred to 2.5 dpc recipients using the non-surgical embryo transfer. Our results showed that MMP-2 & -9 protein levels in mouse uterine fluid were significantly increased at 2.5 dpc. Moreover, in vitro treatment significantly promoted both spreading and invasion of mouse trophoblastic cells as compared with the non-treated. Embryo transfer results showed that MMP-9 cotransfer enhanced mouse implantation and pregnancy rate compared with the control and MMP-2 cotransfered groups, however, that was not significant. Taken together, our findings imply that MMP-9 cotransfer with embryos can regulate embryo invasion during preimplantation, which may have serious consequence on embryo implantation and can be applied in other mammals so far as human being.
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