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ELECTROCHEMICAL Co 3 O 4 NANOPOROUS THIN FILMS SENSOR FOR HYDROGEN PEROXIDE DETECTION
GUANG SHENG CAO,RUILIN WANG,PEILONG WANG,XIN LI,YUE WANG,JUNPING LI,GUILONG WANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.4
The nanoporous Co 3 O 4 thin ¯lms were prepared on indium tin oxide (ITO) glasses by anelectrodeposition method. The surface morphology and composition of the nanoporous Co 3 O 4¯lms were characterized by scanning electron microscopy (SEM), energy-dispersive X-rayanalysis (EDS) and X-ray photoelectron spectroscopy (XPS). The results show that the as-deposited nanoporous Co 3 O 4 ¯lm is constructed by many interconnected nano°akes withthickness of about 40 nm. The cyclic voltammetry (CV) measurement indicates that thenanoporous Co 3 O 4 ¯lms exhibit remarkable electrocatalytic activities for the hydrogen peroxide(H 2 O 2 ) reduction which shows that it is a good candidate to be employed as electrode materialsfor electrochemical sensing of H 2 O 2 . Further analysis indicated that the detection sensitivityof the sensor was 1.357 mA mM? 1 cm? 2 and the detection limit was estimated to be about0.2 mM.
Partial Pole Assignment via Constant Gain Feedback in Two Classes of Frequency-domain Models
Guo-Sheng Wang,Guo-Zhen Yang,Guang-Ren Duan 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.2
The design problem of partial pole assignment (PPA) in two classes of frequency-domain MIMO models by constant gain feedback is investigated in this paper. Its aim is to design a constant gain feedback which changes only a subset of the open-loop eigenvalues, while the rest of them are kept unchanged in the closed-loop system. A near general parametric expression for the feedback gain matrix in term of a set of design parameter vectors and the set of the closed-loop poles, and a simple parametric approach for solving the proposed problem are presented. The set of poles do not need to be previously prescribed, and can be set undetermined and treated together with the set of parametric vectors as degrees of design freedom provided by the approach. An illustrative example shows that the proposed parametric method is simple and effective.
H₂-optimal Control with Regional Pole Assignment via State Feedback
Guo-Sheng Wang,Bing Liang,Guang-Ren Duan 대한전기학회 2006 International Journal of Control, Automation, and Vol.4 No.5
The design of H₂-optimal control with regional pole assignment via state feedback in linear time-invariant systems is investigated. The aim is to find a state feedback controller such that the closed-loop system has the desired eigenvalues lying in some desired stable regions and attenuates the disturbance between the output vector and the disturbance vector. Based on a proposed result of parametric eigenstructure assignment via state feedback in linear systems, the considered H₂-optimal control problem is changed into a minimization problem with certain constraints, and a simple and effective algorithm is proposed for this considered problem. A numerical example and its simulation results show the simplicity and effectiveness of this proposed algorithm.
Hao, Guang-Wei,Chen, Yu-Sheng,He, De-Ming,Wang, Hai-Yu,Wu, Guo-Hao,Zhang, Bo Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.5
Background: Tumors are largely unable to metabolize ketone bodies for energy due to various deficiencies in one or both of the key mitochondrial enzymes, which may provide a rationale for therapeutic strategies that inhibit tumor growth by administration of a ketogenic diet with average protein but low in carbohydrates and high in fat. Materials and Methods: Thirty-six male BALB/C nude mice were injected subcutaneously with tumor cells of the colon cancer cell line HCT116. The animals were then randomly split into three feeding groups and fed either a ketogenic diet rich in omega-3 fatty acids and MCT (MKD group; n=12) or lard only (LKD group; n=12) or a standard diet (SD group; n=12) ad libitum. Experiments were ended upon attainment of the target tumor volume of $600mm^3$ to $700mm^3$. The three diets were compared for tumor growth and survival time (interval between tumor cell injection and attainment of target tumor volume). Results: The tumor growth in the MKD and LKD groups was significantly delayed compared to that in the SD group. Conclusions: Application of an unrestricted ketogenic diet delayed tumor growth in a mouse xenograft model. Further studies are needed to address the mechanism of this diet intervention and the impact on other tumor-relevant parameters such as invasion and metastasis.
Qinqin Wang,Shouxin Liu,Weijuan Sheng,Naer Guang,Xuan Li 한국고분자학회 2015 Macromolecular Research Vol.23 No.7
Novel hydrophilic, temperature responsive, and biodegradable ABA triblock-graft copolymers, [poly(ε- caprolactone)-g-poly(2-(2-methoxyethoxy) ethyl methacrylate-co-oligo(ethylene glycol) methacrylate)]-b-poly(ethylene glycol)-b-[poly(-caprolactone)-g-poly(2-(2-methoxyethoxy) ethyl methacrylate-co-oligo(ethylene glycol) methacrylate)] ([PCL-g-P(MEO2MA-co-OEGMA)]-b-PEG-b-[PCL-g-P(MEO2MA-co-OEGMA)]) (tBGs), were synthesized via a combination of ring-opening polymerization (ROP) of ε-caprolactone (εCL) and α-chloro-ε-caprolactone (αClεCL) in the presence of PEG and atom transfer radical polymerization (ATRP) of MEO2MA and OEGMA. Temperature responsive P(MEO2MA-co-OEGMA) graft chains on the hydrophobic PCL block of PCL-b-PEG-b-PCL not only improved the solubility of PCL-b-PEG-b-PCL in water, but also endowed it with temperature sensitivity. The synthesized temperature responsive triblock-graft copolymers formed well-defined core-shell micelles as the temperature was above their LCST (ca. 35 oC), with hydrophilic PEG block as shell, P(MEO2MA-co-OEGMA) graft chains on the PCL block and hydrophobic PCL block aggregates as core. The micellization induced by temperature for the tBGs in aqueous solutions had been investigated by transmittance measurement, laser particle size measurement, 1H NMR in D2O, DLS and TEM. For a given tBG5 aqueous solution (30 wt%), a weak hydrogel was available at 35 oC, and its sol-gel transition temperature gradually decreased with increasing concentration. In addition, the tBG5 hydrogels loaded with anethole were used for hydrophobic drug release, and in vitro the sustained release of anethole from the tBG5 hydrogels was examined, which is a significant for anethole for their biomedical applications.
Dun Sheng Shang,Guang Fu Bai,Jian Tang,Yan Ling Tang,Guang Xin Wang,Nian Xie 한국광학회 2023 Current Optics and Photonics Vol.7 No.5
A scheme is proposed to generate triangular waveforms with alterable symmetry. The key component is a cascaded single-drive Mach-Zehnder modulator (SD-MZM) and optical polarization beam splittercombiner architecture. In this triangular waveform generator, the bias-induced phase shift, modulation index and controllable delay difference are changeable. To generate triangular waveform signals with different symmetry indexes, different combinations of these variables are selected. Compared with the previous schemes, this generator just contains one SD-MZM and the balanced photodetector (BPD) is not needed, which means the costs and energy consumption are significantly reduced. The operation principle of this triangular waveform generator has been theoretically analyzed, and the corresponding simulation is conducted. Based on the theoretical and simulated results, some experiments are demonstrated to prove the validity of the scheme. The triangular waveform signals with a symmetry factor range of 20–80% are generated. Both experiment and theory prove the feasibility of this method.
Heavy concrete shielding properties for carbon therapy
Jin-Long Wang,Jiade J Lu,Da-Jun Ding,Wen-Hua Jiang,Ya-Dong Li,Rui Qiu,Hui Zhang,Xiao-Zhong Wang,Huo-Sheng Ruan,Yan-Bing Teng,Xiao-Guang Wu,Yun Zheng,Zi-Hao Zhao,Kai-Zhong Liao,Huan-Cheng Mai,Xiao-Dong Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6
As medical facilities are usually built at urban areas, special concrete aggregates and evaluation methods are needed to optimize the design of concrete walls by balancing density, thickness, material composition, cost, and other factors. Carbon treatment rooms require a high radiation shielding requirement, as the neutron yield from carbon therapy is much higher than the neutron yield of protons. In this case study, the maximum carbon energy is 430 MeV/u and the maximum current is 0.27 nA from a hybrid particle therapy system. Hospital or facility construction should consider this requirement to design a special heavy concrete. In this work, magnetite is adopted as the major aggregate. Density is determined mainly by the major aggregate content of magnetite, and a heavy concrete test block was constructed for structural tests. The compressive strength is 35.7 MPa. The density ranges from 3.65 g/cm<sup>3</sup> to 4.14 g/cm<sup>3</sup>, and the iron mass content ranges from 53.78% to 60.38% from the 12 cored sample measurements. It was found that there is a linear relationship between density and iron content, and mixing impurities should be the major reason leading to the nonuniform element and density distribution. The effect of this nonuniformity on radiation shielding properties for a carbon treatment room is investigated by three groups of Monte Carlo simulations. Higher density dominates to reduce shielding thickness. However, a higher content of high-Z elements will weaken the shielding strength, especially at a lower dose rate threshold and vice versa. The weakened side effect of a high iron content on the shielding property is obvious at 2.5 µSv=h. Therefore, we should not blindly pursue high Z content in engineering. If the thickness is constrained to 2 m, then the density can be reduced to 3.3 g/cm<sup>3</sup>, which will save cost by reducing the magnetite composition with 50.44% iron content. If a higher density of 3.9 g/cm<sup>3</sup> with 57.65% iron content is selected for construction, then the thickness of the wall can be reduced to 174.2 cm, which will save space for equipment installation.