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Preparation of Highly Visible-Light Photocatalytic Active N-Doped TiO<sub>2</sub> Microcuboids
Zhao, Kang,Wu, Zhiming,Tang, Rong,Jiang, Yadong Korean Chemical Society 2013 대한화학회지 Vol.57 No.4
N-doped $TiO_2$ microcuboids were successfully prepared by a simple one-pot hydrothermal method. The samples were characterized by X-ray diffraction, scanning electron microscopy, diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. It was found that the N-doped $TiO_2$ microcuboids enhanced absorption in the visible light region, and exhibited higher activity for photocatalytic degradation of model dyes. Based on the experimental results, a visible light induced photocatalytic mechanism was proposed for N-doped anatase $TiO_2$ microcuboids.
Zhiming Xu,Jingtao Wang,Zhimin Han,Yu Zhao 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
In order to study the composite fouling characteristics of crystallization and particulate, the fouling characteristics of calcium carbonate (CaCO 3 ) and nanometer magnesia in the alternating elliptical axis tube were investigated experimentally. The results show that CaCO 3has obvious effect on the inhibition of the formation of particulate fouling. The asymptotic value of fouling resistance of the nanometer magnesia is the highest and the CaCO 3 is the lowest, and the composite fouling is between them. The fouling rate and the asymptotic value of composite fouling resistance decrease with the increase of the CaCO 3 concentration. The time reaches to the asymptotic value of the three experiments are similar. The variation of nanometer magnesia concentration has greater influence than the CaCO 3 concentration on the asymptotic value of composite fouling. The fouling rate and the asymptotic value of composite fouling resistance increase obviously with the increase of the nanometer magnesia concentration.
Zhiming Xu,Hongliang Chang,Bingbing Wang,Jingtao Wang,Qi Zhao 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
The present study examined the effect of electric fields in calcium carbonate (CaCO 3 ) scale formation on a heat transfer surface. The effects of electric fields ranging from 0 V to 4000 V on the fouling properties of CaCO 3 were investigated. Results showed that the optimal electric voltage was approximately 500 V, at which the asymptotic value of fouling resistance and the deposited weight were minimal and corresponded to 52.8 % and 61.3 % reductions, respectively, compared with the results recorded at 0 V. At higher voltages of 3000 V or 4000 V, the asymptotic value of fouling resistance and the weight of fouling deposits increased relative to those obtained at 0 V. The scanning electron microscope images of the fouling deposits obtained at 0 V showed mainly aragonites with sharp and needle-like crystal structures. The structure of CaCO 3 fouling changed from aragonites to spherical vaterites as the applied voltage was increased.
Zhiming Ma,Fangzhi Zhu,Tiejun Zhao 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.2
Surface waterproofing treatment with silane coupling agent is developed to prepare surface modification concrete, in recent years, which possesses an excellent permeability resistance. Freeze-thaw damage inevitable exists in concrete exposed to the cold environment, therefor this paper intensively investigates the effects of surface modification of silane coupling agent on the properties of concrete with freeze-thaw damage. Freeze-thaw cycles, capillary absorption, chloride penetration and carbonization tests were carried out, respectively. The results demonstrate that the surface waterproofing treatment is appropriate for the durability repairing of concrete with freeze-thaw damage, and the penetration depth of silane coupling agent in concrete increases linearly with the rise of freeze-thaw damage. The water and chloride permeability both increase with the increased freeze-thaw cycles for various concrete; however, the surface modification concrete has a better permeability resistance than ordinary concrete with the same freeze-thaw damage. In particular, the permeability resistance increases with the increases of applied amount of silane coupling agent, and there exists a good correlation between the permeability behavior and induced freeze-thaw damage for various concrete. Abrasion significantly decrease the permeability resistance of surface modification concrete, which should be considered carefully in the durability repairing.
A Study on Sybil Attacks in Internet-of-Vehicles
Qiang Zhao,Zhiming He,Haoran Mei,Limei Peng 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1
In this paper, we conduct a study on Sybil attacks under the environment of Internet of Vehicles (IoV). We study various types of Sybil attacks and their solutions in IoV, so as to solicit a novel algorithm to address the Sybil attack.
Sina S. Jamali,Yue Zhao,Zhiming Gao,Huijun Li,Ay Ching Hee 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-
Field application of electrochemical measurements with a non-invasive electrode arrangement has beenused for investigating corrosion damage and protectiveness of a paint coating on an artwork sculpture. For thisfield application solid state probes were designed and used in electrochemical impedancespectroscopy (EIS) and electrochemical noise measurement (ENM) to evaluate the level of corrosionprotection afforded by the paint coating. Samples were also analyzed in laboratory using analyticaltechniques. Results of electrochemical measurements indicated poor protective properties of the paintcoating while analytical examinations revealed an inhomogeneous structure of the coating and a highlyporous structure of the oxide scale.
Li Xiang,Peng Zhiming,Long Lingli,Lu Xiaofang,Zhu Kai,Tuo Ying,Chen Ningning,Zhao Xiaoyang,Wang Le,Wan Yong 생화학분자생물학회 2020 Experimental and molecular medicine Vol.52 No.-
Traditional therapeutic strategies for spinal cord injury (SCI) are insufficient to repair locomotor function because of the failure of axonal reconnection and neuronal regeneration in the injured central nervous system (CNS). Neural stem cell (NSC) transplantation has been considered a potential strategy and is generally feasible for repairing the neural circuit after SCI; however, the most formidable problem is that the neuronal differentiation rate of NSCs is quite limited. Therefore, it is essential to induce the neuronal differentiation of NSCs and improve the differentiation rate of NSCs in spinal cord repair. Our results demonstrate that both Wnt5a and miRNA200b-3p could promote NSC differentiation into neurons and that Wnt5a upregulated miRNA200b-3p expression through MAPK/JNK signaling to promote NSC differentiation into neurons. Wnt5a could reduce RhoA expression by upregulating miRNA200b-3p expression to inhibit activation of the RhoA/Rock signaling pathway, which has been reported to suppress neuronal differentiation. Overexpression of RhoA abolished the neurogenic capacity of Wnt5a and miRNA200b-3p. In vivo, miRNA200b-3p was critical for Wnt5a-induced NSC differentiation into neurons to promote motor functional and histological recovery after SCI by suppressing RhoA/Rock signaling. These findings provide more insight into SCI and help with the identification of novel treatment strategies.
The Single Center Experience of One Thousand Cases of Robotic Pancreatectomy
( Rong Liu ),( Sai Chou ),( Zhiming Zhao ),( Guodong Zhao ),( Yuanxing Gao ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Operation plan for pancreatic tumor used to be divided in four main type,pancreaticoduodenectomy (PD),central pancreatectomy,distal pancreatectomy (DP) and pancreatic enucleation. To evaluate the value of da Vinci robotic surgery system in pancreatectomy. Methods: The clinical data of a consecutive of 1000patients who underwent robotic-assisted pancreatectomy from Novem-ber, 2011 to September 2017 were retrospectively reviewed. All the operations were performed by the same team, which mainly approach in Da Vinci robotic system Si. The demographic characteristics, intraoperative blood loss, operative duration, post-operative hospital stay, blood transfusion details, and conversion rate were all analyzed. Results: A total of 1000 patients were included in this study, with an average age of 54.0, and 486 cases of them were male. The average operative time was 3.5 hours (2-7 h), the estimated blood loss was 100ml (20-1200 ml), and the postoperative hospital stay was 9.3 days in average. Overall complication morbidity was 7.9% (79/1000) and 6.7%(67/1000) cases suffered from grade B-C Pancreatic fistula, with the conversion rate of 3.2% and 30-Day mortality rate of 0.42%. Conclusions: Robotic pancreatectomy could be successfully performed with the assistance of da Vinci surgery system, the operative duration, post-operative hospital stay and intraoperative blood loss were satisfying, with very patients died in 30 days and very operations converted.
Grid-Connected Dual Stator-Winding Induction Generator Wind Power System for Wide Wind Speed Ranges
Kai Shi,Peifeng Xu,Zengqiang Wan,Feifei Bu,Zhiming Fang,Rongke Liu,Dean Zhao 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4
This paper presents a grid-connected dual stator-winding induction generator (DWIG) wind power system suitable for wide wind speed ranges. The parallel connection via a unidirectional diode between dc buses of both stator-winding sides is employed in this DWIG system, which can output a high dc voltage over wide wind speed ranges. Grid-connected inverters (GCIs) do not require booster converters; hence, the efficiency of wind energy utilization increases, and the hardware topology and control strategy of GCIs are simplified. In view of the particularities of the parallel topology and the adopted generator control strategy, we propose a novel excitation–capacitor optimization solution to reduce the volume and weight of the static excitation controller. When this excitation–capacitor optimization is carried out, the maximum power tracking problem is also considered. All the problems are resolved with the combined control of the DWIG and GCI. Experimental results on the platform of a 37 kW/600 V prototype show that the proposed DWIG wind power system can output a constant dc voltage over wide rotor speed ranges for grid-connected operations and that the proposed excitation optimization scheme is effective.