Gas-sensing properties of Ptn-doped WSe2 to SF6 decomposition products

Lingna Xu,Yingang Gui,Wenjun Li,Qiaomei Li,Xianping Chen 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-

Two-dimensional transition metal disulfides (TMDs) has attracted considerable attention due to itsexcellent physicochemical properties. In order to detect the SF6 decomposition products, transition metalPt cluster doping was chosen to enhance the adsorption property of intrinsic WSe2 monolayer. Theadsorption of SO2, SOF2 and SO2F2 on Ptn (n = 1–3) doped WSe2 monolayer is studied based on thefirstprinciplecalculation. The adsorption energy, charge transfer, and density of states of the interactionbetween the target gas molecules and Ptn-WSe2 were studied. The calculation results showed that Pt3doping dramatically enhances the adsorption of WSe2 to SO2 and SOF2 and SO2F2 molecules. Meanwhile,electrons transfer from Ptn-WSe2 surface to these three kinds of target gas molecules, reducing theconductivity of the adsorption system in different degrees. The results of this study not only haveimportant significance for explaining the sensing mechanism of Ptn-WSe2 adsorption to SF6 gasdecomposition products, but also provide a potential material for further development of gas sensingsensors.

16-QAM Periodic Complementary Sequence Mates Based on Interleaving Technique and Quadriphase Periodic Complementary Sequence Mates

Fanxin Zeng,Xiaoping Zeng,Lingna Xiao,Zhenyu Zhang,Guixin Xuan 한국통신학회 2013 Journal of communications and networks Vol.15 No.6

Based on an interleaving technique and quadriphase periodiccomplementary sequence (CS) mates, this paper presents amethod for constructing a family of 16-quadrature amplitudemodulation(QAM) periodic CS mates. The resulting mates arise fromthe conversion of quadriphase periodic CS mates, and the period ofthe former is twice as long as that of the latter. In addition, basedon the existing binary periodic CS mates, a table on the existenceof the proposed 16-QAM periodic CS mates is given. Furthermore,the proposed method can also transform a mutually orthogonal(MO) quadriphase CS set into an MO 16-QAM CS set. Finally,three examples are given to demonstrate the validity of the proposedmethod.

Effects of Acute Sacral Neuromodulation at Different Pulse Widths on Bladder Overactivity in Pigs

Huiling Cong,Limin Liao,Yiming Wang,Lingna Zhao,Zhaoxia Wang,Guang Fu,Guoqing Chen 대한배뇨장애요실금학회 2019 International Neurourology Journal Vol.23 No.2

Purpose: Sacral nerve stimulation has been used to treat overactive bladder. This study evaluated the effects of stimulation using different pulse widths on the inhibition of bladder overactivity by sacral nerve stimulation (SNM) in pigs. Methods: Implant-driven stimulators were used to stimulate the S3 spinal nerve in 7 pigs. Cystometry was performed by infusing normal saline (NS) or acetic acid (AA). SNM at pulse widths of 64 μsec to 624 μsec was conducted at the intensity threshold at which observable perianal and/or tail movement was induced. Multiple cystometrograms were performed to determine the effects of different pulse widths on the micturition reflex. Results: AA-induced bladder overactivity reduced the bladder capacity to 46.9%±7.1% of the NS control level (P<0.05). During AA infusion, SNM at 64 μsec, 204 μsec, and 624 μsec increased the bladder capacity to 126.1%±6.9%, 129.5%±7.3%, and 140.1%±7.6% of the AA control level (P<0.05). No significant differences were found among the results obtained using pulse widths of 64 μsec, 204 μsec, and 624 μsec (P>0.05). The actual intensity threshold varied from 0.7 to 8 V. The mean intensity threshold (T visual) for pulse widths of 64 μs, 204 μs, and 624 μs were 5.64±0.76 V, 3.11±0.48 V, and 2.52±0.49 V. T visual for pulse widths of 64 μsec was larger than the other two T visual for pulse widths of 204 μsec and 624 μsec (P<0.05). No significant differences were found among the T visual for pulse widths of 204 μsec and 624 μsec (P>0.05). Conclusions: This study indicated that different pulse widths could play a role in inhibiting bladder overactivity. It is not yet certain which pulse widths increased bladder capacity compared with AA levels, to minimize energy consumption and maintain patient comfort during stimulation, 204 μsec may be an appropriate pulse width for SNM.

16-QAM Periodic Complementary Sequence Mates Based on Interleaving Technique and Quadriphase Periodic Complementary Sequence Mates

Zeng, Fanxin,Zeng, Xiaoping,Xiao, Lingna,Zhang, Zhenyu,Xuan, Guixin The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.6

Based on an interleaving technique and quadriphase periodic complementary sequence (CS) mates, this paper presents a method for constructing a family of 16-quadrature amplitude modulation (QAM) periodic CS mates. The resulting mates arise from the conversion of quadriphase periodic CS mates, and the period of the former is twice as long as that of the latter. In addition, based on the existing binary periodic CS mates, a table on the existence of the proposed 16-QAM periodic CS mates is given. Furthermore, the proposed method can also transform a mutually orthogonal (MO) quadriphase CS set into an MO 16-QAM CS set. Finally, three examples are given to demonstrate the validity of the proposed method.

Adsorption behavior of metal oxides (CuO, NiO, Ag2O) modified GeSe monolayer towards dissolved gases (CO, CH4, C2H2, C2H4) in transformer oil

Yingang Gui,Zhicheng Liu,Chang Ji,Lingna Xu,Xianping Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-

In this study, the adsorption behavior of CuO-GeSe, NiO-GeSe, and Ag2O-GeSe towards the main dissolvedgases CO, CH4, C2H2, and C2H4 in transformer oil was systematically studied based on DFT. The adsorptionstructure, band structure, density of states, deformation charge density, and molecular orbit were analyzedto explore the interaction between the modified monolayers and gases. The results show thatthe adsorption of the four target gases on pristine GeSe belongs to weak physical adsorption. Metal oxidesmodification improves the conductivity of GeSe, and the formation of numerous triangular structuresmakes the modified substrates hard to deform during gas adsorption. Due to the poor gas sensitivityand extremely short recovery time of CH4 on CuO-GeSe, NiO-GeSe, and Ag2O-GeSe, these three modifiedstructures are not suitable to be used as a material for detecting CH4. The conductivity of MO-GeSechanges in different degrees after adsorbing CO, C2H2, and C2H4. The gases can be detected accordingto the different change rule of conductivity upon adsorption. In addition, gas desorption from the substratecan be achieved by controlling the temperature. This study provides a theoretical basis for theapplication of gas sensors used in DGA.

Stable Sheet-Beam Transport in Periodic Nonsymmetric Quadrupole Field

Zhanliang Wang,Yubin Gong,Yanyu Wei,Zhaoyun Duan,Huarong Gong,Zhigang Lu,Lingna Yue,Hairong Yin,Jin Xu,Yuanbao Li,Pukun Liu,Gun-Sik Park IEEE 2010 IEEE transactions on plasma science Vol.38 No.1

<P>Stable sheet electron-beam transport is critical for sheet-beam microwave device which is attractive for high-power millimeter wave to terahertz-regime radiation. This paper studies the stable sheet-beam transport in periodic nonsymmetric quadrupole field. First, the conditions for stable round- and sheet-beam transport in periodic magnetic quadrupole field are deduced. In the deduction, we find that the symmetric quadrupole field and the space-charge field of sheet beam are not well matched. In order to settle this problem, we use periodic nonsymmetric quadrupole field instead of periodic symmetric quadrupole field to transport sheet beam. Finally, 3-D PIC simulations verify the conditions for stable sheet-beam transport and show that periodic nonsymmetric quadrupole field is intrinsically well suited for sheet-beam transport.</P>

New Construction Method for Quaternary Aperiodic, Periodic, and Z-Complementary Sequence Sets

Fanxin Zeng,Xiaoping Zeng,Zhenyu Zhang,Xiangyong Zeng,Guixin Xuan,Lingna Xiao 한국통신학회 2012 Journal of communications and networks Vol.14 No.3

Based on the known binary sequence sets and Gray mapping,a new method for constructing quaternary sequence sets is presented and the resulting sequence sets’ properties are investigated. As three direct applications of the proposed method, when we choose the binary aperiodic, periodic, and Z-complementary sequence sets as the known binary sequence sets, the resultant quaternary sequence sets are the quaternary aperiodic, periodic, and Z-complementary sequence sets, respectively. In comparison with themethod proposed by Jang et al., the new method can cope with either both the aperiodic and periodic cases or both even and odd lengths of sub-sequences, whereas the former is only fit for the periodic case with even length of sub-sequences. As a consequence,by both our and Jang et al.’s methods, an arbitrary binary aperiodic,periodic, or Z-complementary sequence set can be transformed into a quaternary one no matter its length of sub-sequences is odd or even. Finally, a table on the existing quaternary periodic complementary sequence sets is given as well.

New Construction Method for Quaternary Aperiodic, Periodic, and Z-Complementary Sequence Sets

Zeng, Fanxin,Zeng, Xiaoping,Zhang, Zhenyu,Zeng, Xiangyong,Xuan, Guixin,Xiao, Lingna The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.3

Based on the known binary sequence sets and Gray mapping, a new method for constructing quaternary sequence sets is presented and the resulting sequence sets' properties are investigated. As three direct applications of the proposed method, when we choose the binary aperiodic, periodic, and Z-complementary sequence sets as the known binary sequence sets, the resultant quaternary sequence sets are the quaternary aperiodic, periodic, and Z-complementary sequence sets, respectively. In comparison with themethod proposed by Jang et al., the new method can cope with either both the aperiodic and periodic cases or both even and odd lengths of sub-sequences, whereas the former is only fit for the periodic case with even length of sub-sequences. As a consequence, by both our and Jang et al.'s methods, an arbitrary binary aperiodic, periodic, or Z-complementary sequence set can be transformed into a quaternary one no matter its length of sub-sequences is odd or even. Finally, a table on the existing quaternary periodic complementary sequence sets is given as well.

The Biocompatibility of Multi-Source Stem Cells and Gelatin-Carboxymethyl Chitosan-Sodium Alginate Hybrid Biomaterials

Wang Xinzhe,Li Siqi,Yu Honglian,Lv Jianzhi,Fan Minglun,Wang Ximing,Wang Xin,Liang Yanting,Mao Lingna,Zhao Zhankui 한국조직공학과 재생의학회 2022 조직공학과 재생의학 Vol.19 No.3

BACKGROUND: Nowadays, biological tissue engineering is a growing field of research. Biocompatibility is a key indicator for measuring tissue engineering biomaterials, which is of great significance for the replacement and repair of damaged tissues. METHODS: In this study, using gelatin, carboxymethyl chitosan, and sodium alginate, a tissue engineering material scaffold that can carry cells was successfully prepared. The material was characterized by Fourier transforms infrared spectroscopy. In addition, the prepared scaffolds have physicochemical properties, such as swelling ratio, biodegradability. we observed the biocompatibility of the hydrogel to different adult stem cells (BMSCs and ADSCs) in vivo and in vitro. Adult stem cells were planted on gelatin-carboxymethyl chitosan-sodium alginate (Gel/SA/CMCS) hydrogels for 7 days in vitro, and the survival of stem cells in vitro was observed by live/died staining. Gel/SA/CMCS hydrogels loaded with stem cells were subcutaneously transplanted into nude mice for 14 days of in vivo culture observation. The survival of adult stem cells was observed by staining for stem cell surface markers (CD29, CD90) and Ki67. RESULTS: The scaffolds had a microporous structure with an appropriate pore size (about 80 lm). Live/died staining showed that adult stem cells could stably survive in Gel/SA/CMCS hydrogels for at least 7 days. After 14 days of culture in nude mice, Ki67 staining showed that the stem cells supported by Gel/SA/CMCS hydrogel still had high proliferation activity. CONCLUSION: Gel/SA/CMCSs hydrogel has a stable interpenetrating porous structure, suitable swelling performance and degradation rate, can promote and support the survival of adult stem cells in vivo and in vitro, and has good biocompatibility. Therefore, Gel/SA/CMCS hydrogel is a strong candidate for biological tissue engineering materials.