1.Introduction Silicon photonic integration is considered to be one of the most promising techniques in realizing high-density photonic integrated circuits because of its compact device size and CMOS compatible fabric...1.Introduction Silicon photonic integration is considered to be one of the most promising techniques in realizing high-density photonic integrated circuits because of its compact device size and CMOS compatible fabrication process.However,due to the large index contrast of silicon waveguides,silicon photonic devices are affected by the large polarization mode dispersion,polarization dependent loss and polarization dependent wavelength characteristics.Polarization transparent circuits and polarization diversity schemes,which have polarization rotators and splitters as common key devices,have been proposed to solve this issue[1–3].展开更多
The trust as a social relationship captures similarity of tastes or interests in perspective. However, the existent trust information is usually very sparse, which may suppress the accuracy of our personal product rec...The trust as a social relationship captures similarity of tastes or interests in perspective. However, the existent trust information is usually very sparse, which may suppress the accuracy of our personal product recommendation algorithm via a listening and trust preference network. Based on this thinking, we experiment the typical trust inference methods to find out the most excellent friend-recommending index which is used to expand the current trust network. Experimental results demonstrate the expanded friendships via superposed random walk can indeed improve the accuracy of our personal product recommendation.展开更多
The physical and chemical properties have significant differences for the positive and negative charged particles generated by discharge.In this work,a positive and negative corona discharge system was established,and...The physical and chemical properties have significant differences for the positive and negative charged particles generated by discharge.In this work,a positive and negative corona discharge system was established,and two discharge reactors for charged particles restraining and acting were designed by a needle electrode covered with a quartz tube and a plate electrode filled with water.The corona discharges happened within the needle-plate electrodes were excited by a positive and negative high voltage source,and the characteristics of both water volatilization and oxides generation were examined within influence of the distances of both quartz tube inside and outside.The results show that the characteristics of both the water volatilization and oxides generation can be affected by the distances of both quartz tube inside and outside.When the distances of tube inside were increased from 5.00 to 13.00 mm,the water volatilizations decreased under negative corona,and increased firstly and declined immediately under positive corona.The maximum value of the water volatilization appeared in the distances of tube inside with 6.00–8.00 mm.In addition,the concentrations of the HNO_(x) and H_(2)O_(2)in treated water decreased with increasing the distances of tube inside.Moreover,with increasing the distances of tube outside from 4.00 to 14.00 mm,the change trends of both the water volatilizations and oxides presented the same as the distances of tube inside,and the maximum value of the water volatilization and oxides appeared in the distance of tube outside with about 9.00 mm.Overall,the positive corona can generate more water volatilizations and oxides in water than negative corona,and non H_(2)O_(2)can be produced by negative corona.The results reflect the difference between positive and negative corona interaction with water,which can provide reference for plasma application.展开更多
Pb_(0.82)Sr_(013)Ba_(0.05)(Sb_(1/3)Nb_(2/3))_(0.02)(Zr_(1/2)Ti_(1/2))_(0.98)O_3(abbreviated as PSN-PZT)piezoelectric ceramicswere synthesized by conventional solid-state reaction meth-od.The effect of Bi3^+ and Ce4^+ ...Pb_(0.82)Sr_(013)Ba_(0.05)(Sb_(1/3)Nb_(2/3))_(0.02)(Zr_(1/2)Ti_(1/2))_(0.98)O_3(abbreviated as PSN-PZT)piezoelectric ceramicswere synthesized by conventional solid-state reaction meth-od.The effect of Bi3^+ and Ce4^+ doped on electrical properties were investigated.The ceramics展开更多
Pb(Ni_(1/3)Nb_(2/3))_(0.10)(Sb_(1/2)Nb_(1/2))_(0.015)(Mg_(1/3)Nb_(2/3))_(0.035)(Zr_xTi_(1-x))_(0.85)O_3 piezoelectric ceramics(abbreviated as PNN-PSN-PMN-PZT)were synthesized by conventional solid-state reaction metho...Pb(Ni_(1/3)Nb_(2/3))_(0.10)(Sb_(1/2)Nb_(1/2))_(0.015)(Mg_(1/3)Nb_(2/3))_(0.035)(Zr_xTi_(1-x))_(0.85)O_3 piezoelectric ceramics(abbreviated as PNN-PSN-PMN-PZT)were synthesized by conventional solid-state reaction method.The effects of R(Zr)/R(Ti)on phase structure,microstructure,dielectric,piezoelectric and ferroelectric properties of the ceramics展开更多
A silicon-on-insulator-based adiabatic waveguide taper with a high coupling efficiency and small footprint is presented.The taper was designed to reduce the incidence of mode conversion to higher-order and radiation m...A silicon-on-insulator-based adiabatic waveguide taper with a high coupling efficiency and small footprint is presented.The taper was designed to reduce the incidence of mode conversion to higher-order and radiation modes inside the waveguide.In connecting a 0.5-μm-wide output waveguide and a 12-μm-wide input waveguide of a grating coupler,a compact 120-μm-long taper was demonstrated,achieving a transmission of 98.3%.Previously,this transmission level could only be achieved using a conventional linear taper with a length of more than 300μm.展开更多
The electrical nonlinearity of silicon modulators based on reversed PN junctions was found to severely limit the linearity of the modulators.This effect,however,was inadvertently neglected in previous studies.Consider...The electrical nonlinearity of silicon modulators based on reversed PN junctions was found to severely limit the linearity of the modulators.This effect,however,was inadvertently neglected in previous studies.Considering the electrical nonlinearity in simulation,a 32.2 dB degradation in the CDR3(i.e.,the suppression ratio between the fundamental signal and intermodulation distortion)of the modulator was observed at a modulation speed of 12 GHz,and the spurious free dynamic range was simultaneously degraded by 17.4 dB.It was also found that the linearity of the silicon modulator could be improved by reducing the series resistance of the PN junction.The frequency dependence of the linearity due to the electrical nonlinearity was also investigated.展开更多
Silicon based optical modulators with improved extinction ratio （ER） of 25 dB were demon- strated on complementary metal oxide semiconductor （CMOS） platform. It was proposed that the effect of optical absorption d...Silicon based optical modulators with improved extinction ratio （ER） of 25 dB were demon- strated on complementary metal oxide semiconductor （CMOS） platform. It was proposed that the effect of optical absorption due to free carriers accumulated in silicon should be considered in the analysis of device configuration. Experimental results presented in this study were identical with the proposed analyses. The modulators were operated with the data transmission rate of 3.2 Gbps.展开更多
基金supported by the National Key Research and Development Program of China (No. 2016YFB0402505)the National Science Foundation of China (NSFC) (No. 61575189 and No. 61635011)
文摘1.Introduction Silicon photonic integration is considered to be one of the most promising techniques in realizing high-density photonic integrated circuits because of its compact device size and CMOS compatible fabrication process.However,due to the large index contrast of silicon waveguides,silicon photonic devices are affected by the large polarization mode dispersion,polarization dependent loss and polarization dependent wavelength characteristics.Polarization transparent circuits and polarization diversity schemes,which have polarization rotators and splitters as common key devices,have been proposed to solve this issue[1–3].
文摘The trust as a social relationship captures similarity of tastes or interests in perspective. However, the existent trust information is usually very sparse, which may suppress the accuracy of our personal product recommendation algorithm via a listening and trust preference network. Based on this thinking, we experiment the typical trust inference methods to find out the most excellent friend-recommending index which is used to expand the current trust network. Experimental results demonstrate the expanded friendships via superposed random walk can indeed improve the accuracy of our personal product recommendation.
基金partially supported by Natural Science Foundation of the Jiangsu Province(No.BK20191162)Fundamental Research Funds for the Central Universities(No.B210203006)+1 种基金National Natural Science Foundation of China(No.11874140)Changzhou Science and Technology Program(No.CJ20190046)。
文摘The physical and chemical properties have significant differences for the positive and negative charged particles generated by discharge.In this work,a positive and negative corona discharge system was established,and two discharge reactors for charged particles restraining and acting were designed by a needle electrode covered with a quartz tube and a plate electrode filled with water.The corona discharges happened within the needle-plate electrodes were excited by a positive and negative high voltage source,and the characteristics of both water volatilization and oxides generation were examined within influence of the distances of both quartz tube inside and outside.The results show that the characteristics of both the water volatilization and oxides generation can be affected by the distances of both quartz tube inside and outside.When the distances of tube inside were increased from 5.00 to 13.00 mm,the water volatilizations decreased under negative corona,and increased firstly and declined immediately under positive corona.The maximum value of the water volatilization appeared in the distances of tube inside with 6.00–8.00 mm.In addition,the concentrations of the HNO_(x) and H_(2)O_(2)in treated water decreased with increasing the distances of tube inside.Moreover,with increasing the distances of tube outside from 4.00 to 14.00 mm,the change trends of both the water volatilizations and oxides presented the same as the distances of tube inside,and the maximum value of the water volatilization and oxides appeared in the distance of tube outside with about 9.00 mm.Overall,the positive corona can generate more water volatilizations and oxides in water than negative corona,and non H_(2)O_(2)can be produced by negative corona.The results reflect the difference between positive and negative corona interaction with water,which can provide reference for plasma application.
文摘Pb_(0.82)Sr_(013)Ba_(0.05)(Sb_(1/3)Nb_(2/3))_(0.02)(Zr_(1/2)Ti_(1/2))_(0.98)O_3(abbreviated as PSN-PZT)piezoelectric ceramicswere synthesized by conventional solid-state reaction meth-od.The effect of Bi3^+ and Ce4^+ doped on electrical properties were investigated.The ceramics
文摘Pb(Ni_(1/3)Nb_(2/3))_(0.10)(Sb_(1/2)Nb_(1/2))_(0.015)(Mg_(1/3)Nb_(2/3))_(0.035)(Zr_xTi_(1-x))_(0.85)O_3 piezoelectric ceramics(abbreviated as PNN-PSN-PMN-PZT)were synthesized by conventional solid-state reaction method.The effects of R(Zr)/R(Ti)on phase structure,microstructure,dielectric,piezoelectric and ferroelectric properties of the ceramics
基金This work is supported by the National Basic Research program of China(Grant No.2012CB933502).
文摘A silicon-on-insulator-based adiabatic waveguide taper with a high coupling efficiency and small footprint is presented.The taper was designed to reduce the incidence of mode conversion to higher-order and radiation modes inside the waveguide.In connecting a 0.5-μm-wide output waveguide and a 12-μm-wide input waveguide of a grating coupler,a compact 120-μm-long taper was demonstrated,achieving a transmission of 98.3%.Previously,this transmission level could only be achieved using a conventional linear taper with a length of more than 300μm.
基金National Natural Science Foundation of China(NSFC)(61575189,61635011)
文摘The electrical nonlinearity of silicon modulators based on reversed PN junctions was found to severely limit the linearity of the modulators.This effect,however,was inadvertently neglected in previous studies.Considering the electrical nonlinearity in simulation,a 32.2 dB degradation in the CDR3(i.e.,the suppression ratio between the fundamental signal and intermodulation distortion)of the modulator was observed at a modulation speed of 12 GHz,and the spurious free dynamic range was simultaneously degraded by 17.4 dB.It was also found that the linearity of the silicon modulator could be improved by reducing the series resistance of the PN junction.The frequency dependence of the linearity due to the electrical nonlinearity was also investigated.
基金Acknowledgements This work was supported in part by the National Program on Key Basic Research Project of the Ministry of Science and Technology of China （Nos. 2006CB302803 and 2011CB301701） and the National Natural Science Foundation of China （Grant No. 60877036）.
文摘Silicon based optical modulators with improved extinction ratio （ER） of 25 dB were demon- strated on complementary metal oxide semiconductor （CMOS） platform. It was proposed that the effect of optical absorption due to free carriers accumulated in silicon should be considered in the analysis of device configuration. Experimental results presented in this study were identical with the proposed analyses. The modulators were operated with the data transmission rate of 3.2 Gbps.
