An anomalous total dose effect that the long length device is more susceptible to total ionizing dose than the short one is observed with the 0.13？μm partially depleted silicon-on-insulator technology. The measured ...An anomalous total dose effect that the long length device is more susceptible to total ionizing dose than the short one is observed with the 0.13？μm partially depleted silicon-on-insulator technology. The measured results and 3D technology computer aided design simulations demonstrate that the devices with different channel lengths may exhibit an enhanced reverse short channel effect after radiation. It is ascribed to that the halo or pocket implants introduced in processes results in non-uniform channel doping profiles along the device length and trapped charges in the shallow trench isolation regions.展开更多
A study of the quenching of pyrene fluorescence by a series of alkyltriphenylphosphonium bromides indi- cated the coiling conformation of ionic surfactant in aqueous solution.Formation of pyrene excimer in cetyltriph-...A study of the quenching of pyrene fluorescence by a series of alkyltriphenylphosphonium bromides indi- cated the coiling conformation of ionic surfactant in aqueous solution.Formation of pyrene excimer in cetyltriph- enylphosphonium solution strengthened the conclusion.展开更多
For different external cavity lengths, lasing wavelength variation of fiber grating external cavity semiconductor laser (FGECSL) with ambient temperature has been investigated theoretically, and the theoretical result...For different external cavity lengths, lasing wavelength variation of fiber grating external cavity semiconductor laser (FGECSL) with ambient temperature has been investigated theoretically, and the theoretical results are in agreement with reported experimental observations.展开更多
To reveal the properties of ZrO2 at the atom and electron levels,the valence elec-tron structures of three ZrO2 phases were analyzed on the basis of the empirical electron theory of solids and molecules.The results sh...To reveal the properties of ZrO2 at the atom and electron levels,the valence elec-tron structures of three ZrO2 phases were analyzed on the basis of the empirical electron theory of solids and molecules.The results showed that the hybridization levels of Zr and O atoms in the m-ZrO2 were the same as those in the t-ZrO2,while those in the c-ZrO2 rose markedly.The electron numbers and bond energies on the strongest covalent bonds in the m-ZrO2 phase were the greatest,the values were 0.901106 and 157.5933 kJ/mol,respectively.Those in the t-ZrO2 phase took second place,which were 0.722182 and 123.9304 kJ/mol,and those in the c-ZrO2 phase were the smallest,which were 0.469323 and 79.0289 kJ/mol.According to the product of the bond energy on the strongest covalent bond and equivalent bond number(this value reflected the crystal cohesive energy),the order from the greatness to smallness was the c-ZrO2>t-ZrO2>m-ZrO2.This showed that the m-phase bonds were the tightest,their energy was the smallest,the crystal cohe-sive energy of the m-phase was the largest,and the m-phase existed most stably at room temperature.So it must need energy or higher temperature to take apart the stronger covalent bonds to form a new phase.展开更多
To reveal the properties of stabilizers in ZrO2 on nanoscopic levels,the valence electron structures of four stable ZrO2 phases and c-ZrO2 were analyzed on the basis of the empirical electron theory of solids and mole...To reveal the properties of stabilizers in ZrO2 on nanoscopic levels,the valence electron structures of four stable ZrO2 phases and c-ZrO2 were analyzed on the basis of the empirical electron theory of solids and molecules.The results showed that the hybridization levels of Zr atoms in c-ZrO2 doped with Ca and Mg dropped from B17 to B13,the hybridization levels of Zr atoms in c-ZrO2 doped with Y and Ce dropped from B17 to B15,and that the four stabilizing atoms all made the hybridization levels of O atoms drop from level 4 to level 2.The numbers of covalent electrons in the strongest covalent bond in the descending order are c-ZrO2>Zr0.82Ce0.18O2>Zr0.82Y0.18O1.91>Zr0.82Mg0.18O1.82>Zr0.82Ca0.18O1.82.The bond energies of the strongest covalent bond and the melting points of the solid solutions in the descending order are Zr0.82Ce0.18O2>c-ZrO2>Zr0.82Y0.18O1.91>Zr0.82Mg0.18O1.82>Zr0.82Ca0.18O1.82.The percent-ages of the total number of covalent electrons in the descending order are c-ZrO2>Zr0.82Y0.18O1.91>Zr0.82Ce0.18O2>Zr0.82Mg0.18O1.82>Zr0.82Ca0.18O1.82.From the above analysis,it can be concluded that the stabilizing degrees of the four stabilizers in the descending order are CaO>MgO>Y2O3>CeO2.展开更多
基金Supported by the Weapon Equipment Pre-Research Foundation of China under Grant No 9140A11020114ZK34147the Shanghai Municipal Natural Science Foundation under Grant Nos 15ZR1447100 and 15ZR1447200
文摘An anomalous total dose effect that the long length device is more susceptible to total ionizing dose than the short one is observed with the 0.13？μm partially depleted silicon-on-insulator technology. The measured results and 3D technology computer aided design simulations demonstrate that the devices with different channel lengths may exhibit an enhanced reverse short channel effect after radiation. It is ascribed to that the halo or pocket implants introduced in processes results in non-uniform channel doping profiles along the device length and trapped charges in the shallow trench isolation regions.
文摘A study of the quenching of pyrene fluorescence by a series of alkyltriphenylphosphonium bromides indi- cated the coiling conformation of ionic surfactant in aqueous solution.Formation of pyrene excimer in cetyltriph- enylphosphonium solution strengthened the conclusion.
文摘For different external cavity lengths, lasing wavelength variation of fiber grating external cavity semiconductor laser (FGECSL) with ambient temperature has been investigated theoretically, and the theoretical results are in agreement with reported experimental observations.
基金the Major Project of the National Natural Science Foundation of China(Grant No.90505015)
文摘To reveal the properties of ZrO2 at the atom and electron levels,the valence elec-tron structures of three ZrO2 phases were analyzed on the basis of the empirical electron theory of solids and molecules.The results showed that the hybridization levels of Zr and O atoms in the m-ZrO2 were the same as those in the t-ZrO2,while those in the c-ZrO2 rose markedly.The electron numbers and bond energies on the strongest covalent bonds in the m-ZrO2 phase were the greatest,the values were 0.901106 and 157.5933 kJ/mol,respectively.Those in the t-ZrO2 phase took second place,which were 0.722182 and 123.9304 kJ/mol,and those in the c-ZrO2 phase were the smallest,which were 0.469323 and 79.0289 kJ/mol.According to the product of the bond energy on the strongest covalent bond and equivalent bond number(this value reflected the crystal cohesive energy),the order from the greatness to smallness was the c-ZrO2>t-ZrO2>m-ZrO2.This showed that the m-phase bonds were the tightest,their energy was the smallest,the crystal cohe-sive energy of the m-phase was the largest,and the m-phase existed most stably at room temperature.So it must need energy or higher temperature to take apart the stronger covalent bonds to form a new phase.
基金the Major Project of the National Natural Science Foundation of China(Grant No.90505015)
文摘To reveal the properties of stabilizers in ZrO2 on nanoscopic levels,the valence electron structures of four stable ZrO2 phases and c-ZrO2 were analyzed on the basis of the empirical electron theory of solids and molecules.The results showed that the hybridization levels of Zr atoms in c-ZrO2 doped with Ca and Mg dropped from B17 to B13,the hybridization levels of Zr atoms in c-ZrO2 doped with Y and Ce dropped from B17 to B15,and that the four stabilizing atoms all made the hybridization levels of O atoms drop from level 4 to level 2.The numbers of covalent electrons in the strongest covalent bond in the descending order are c-ZrO2>Zr0.82Ce0.18O2>Zr0.82Y0.18O1.91>Zr0.82Mg0.18O1.82>Zr0.82Ca0.18O1.82.The bond energies of the strongest covalent bond and the melting points of the solid solutions in the descending order are Zr0.82Ce0.18O2>c-ZrO2>Zr0.82Y0.18O1.91>Zr0.82Mg0.18O1.82>Zr0.82Ca0.18O1.82.The percent-ages of the total number of covalent electrons in the descending order are c-ZrO2>Zr0.82Y0.18O1.91>Zr0.82Ce0.18O2>Zr0.82Mg0.18O1.82>Zr0.82Ca0.18O1.82.From the above analysis,it can be concluded that the stabilizing degrees of the four stabilizers in the descending order are CaO>MgO>Y2O3>CeO2.
