The forbidden pitch "dip" in the critical dimension (CD) through the pitch curve is a well-known optical proximity effect. The CD and CD process window near the "dip",usually found near a pitch range of 1.1 to 1...The forbidden pitch "dip" in the critical dimension (CD) through the pitch curve is a well-known optical proximity effect. The CD and CD process window near the "dip",usually found near a pitch range of 1.1 to 1.4 wavelength/ NA (numerical aperture),is smaller when compared with other pitches. This is caused by inadequate imaging contrast for an unequal line and space grating. Although this effect is relatively well-known, its relationship with typical process condition parameters,such as the effective image blur caused by the photo-acid diffusion during the post exposure bake or the aberration in the imaging lens, has not been systematically studied. In this paper, we will examine the correlation between the image blur and the effect on the CD, including the decrease in the CD value (the depth of the "dip") and the CD process window. We find that both the decrease in the CD value and the focus latitude near the forbidden pitch correlate very well with the effective Gaussian image blur. Longer effective diffusion length correlates well with a smaller process window and a deeper CD "dip". We conclude that the dip depth is very sensitive to the change in image contrast.展开更多
Gelatinase A (MMP-2) is considered to play a critical role in cell migration and invasion. The proteinase is secreted from the cell as an inactive zymogen. In vivo it is postulated that activation of progelationase A ...Gelatinase A (MMP-2) is considered to play a critical role in cell migration and invasion. The proteinase is secreted from the cell as an inactive zymogen. In vivo it is postulated that activation of progelationase A (proMMP-2) takes place on the cell surface mediated by membrane-type matrix metalloproteinases (MT-MMPs). Recent studies have demonstrated that proMMP-2 is recruited to the cell surface by interacting with tissue inhibitor of metalloproteinases-2 (TIMP-2) bound to MT1MMP by forming a ternary complex. bee MT1-MMP closely located to the ternary complex then activates proMMP-2 on the cell surface. MT1-MMP is found in cultured invasive cancer cells at the invadopodia. The MTMMP/TIMP-2/ MMP- 2 system t bus provides localized expression of proteolysis of the extracellular matrix required for cell migration.展开更多
We have given a semantic extension of lattice-valued propositional logic LP(X) in [6]. In this paper, we investigate its corresponding syntactic extension of LP(X) and give the relations between these two extensions.
In order to ensure the security of the property-based remote attestation scheme, an improved, more efficient, forrml security model of property-based remote attestation is proposed, with which we prove that the user p...In order to ensure the security of the property-based remote attestation scheme, an improved, more efficient, forrml security model of property-based remote attestation is proposed, with which we prove that the user platform satis- fies the security property requirements predefmed by a remote relying party. Under the co-Corrtautational Diffie-Helknan (CDH) assumption, the proposed scheme is proved to be secure in the random oracle model. Compared with the existing schemes, the proposed scheme has a short property certificate and signature size, and requires less computational cost.展开更多
We propose a quantization procedure for the nucleon-scMar meson system, in which an arbitrary mean scalar meson field Ф is introduced. The equivalence of this procedure with the usual one is proven for any given valu...We propose a quantization procedure for the nucleon-scMar meson system, in which an arbitrary mean scalar meson field Ф is introduced. The equivalence of this procedure with the usual one is proven for any given value of qS. By use of this procedure, the scalar meson field in the Walecka's MFA and in Chin's RHA are quantized around the mean field, Its corrections on these theories are considered by perturbation up to the second order. The arbitrariness of Ф makes us free to fix it at any stage in the calculation. When we fix it in the way of Walecka's MFA, the quantum corrections are big, and the result does not converge. When we fix it in the way of Chin's RHA, the quantum correction is negligibly small, and the convergence is excellent. It shows that RHA covers the leading part of quantum field theory for nuclear systems and is an excellent zeroth order approximation for further quantum corrections, while the Walecka's MFA does not. We suggest to fix the parameter Ф at the end of the whole calculation by minimizing the total energy per-nucleon for the nuclear matter or the total energy for the finite nucleus, to make the quantized relativistic mean field theory (QRMFT) a variational method.展开更多
Nowadays, lighting design is the modern attractive field of professional activity. Although its theoretical and methodological bases are in the initial stage of formulation. Though there are standards for regulating i...Nowadays, lighting design is the modern attractive field of professional activity. Although its theoretical and methodological bases are in the initial stage of formulation. Though there are standards for regulating illumination quantitatively, the science has never created a bridge to transfer illumination quantity into illumination quality. How to keep a day image of architectural object without imitating natural lighting? How unrecognizably to change the image, to make it extraordinary and catchy? This paper offers a solution in the form of external illumination designing principles. This paper proposes two conceptual ways of creating artificial lighting of buildings and constructions that pursue different goals: the principle of "tectonic" illumination and the principle of "decorative" illumination. These principles were developed based on the analysis of the state of the art experience of lighting architectural objects and author's empirical study. The latter contained measuring luminosity with luminance meter, processing the data, statistical survey (180 respondents) and lighting modeling in the laboratory of Moscow Architectural Institute.展开更多
Eosinophilic cholangiopathy is a rare condition characterized by eosinophilic infiltration of the biliary tract and causes sclerosing cholangitis. We report a patient with secondary sclerosing cholangitis with eosinop...Eosinophilic cholangiopathy is a rare condition characterized by eosinophilic infiltration of the biliary tract and causes sclerosing cholangitis. We report a patient with secondary sclerosing cholangitis with eosinophilic cholecystitis. A 46-year-old Japanese man was admitted to our hospital with jaundice. Computed tomography revealed dilatation of both the intrahepatic and extrahepatic bile ducts, diffuse thickening of the wall of the extrahepatic bile duct, and thickening of the gallbladder wall. Under the diagnosis of lower bile duct carcinoma, he underwent pyloruspreserving pancreatoduodenectomy and liver biopsy. On histopathological examination, conspicuous fibrosis was seen in the lower bile duct wall. In the gallbladder wall, marked eosinophilic infiltration was seen. Liver biopsy revealed mild portal fibrosis. He was diagnosed as definite eosinophilic cholecystitis with sclerosing cholangitis with unknown etiology. The possible etiology of sderosing cholangitis was consequent fibrosis from previous eosinophilic infiltration in the bile duct. The clinicopathological findings of our case and a literature review indicated that eosinophilic cholangiopathy could cause a condition mimicking primary sclerosing cholangitis (PSC). Bile duct wall thickening in patients with eosinophilic cholangitis might be due to fibrosis of the bile duct wall. Eosinophilic cholangiopathy might be confused as PSC with eosinophilia.展开更多
The objective of this study was characterizing the gelatin from the chicken feet by FTIR (Fourier transform infrared) spectroscopy. Two gelatin samples were prepared for the experiment which were extracted of 200 g ...The objective of this study was characterizing the gelatin from the chicken feet by FTIR (Fourier transform infrared) spectroscopy. Two gelatin samples were prepared for the experiment which were extracted of 200 g of chicken feet by a thermal bath of 4% acetyl acid solution at 60 ℃. A commercial gelatin was used to compare the results. FTIR spectra of gelatin samples were recorded using a Nicolet iS5 FTIR spectrometer equipped with an ATR/iD3 with argon horizontal cell in which the spectra were varied in the range of 400-4,000 cm1 at 16 ~C. The results showed that FTIR spectra of the chicken feet gelatin had the most with the vibration peak at wave numbers of 1,652.01 cm~ to the amide I, of 1,539.87 cm1 to the amide II, of 1,241.29 cm~ to the amide III, of 2,923.72 cm-~ to the amide B and of 3,399.56 cm~ to the amide A. The collagen composition of the chicken feet gelatins was twotimes larger than the commercial gelatin and the vibration bands to beef gelatin have been different from chicken feet gelatins. This demonstrates that chicken feet gelatins are very good nutritional quality when compared to the commercial gelatin.展开更多
In 21st Century, Chinese and American universities are experiencing great development in the number of students studying abroad. This research adopts the method of natural investigation, selecting Chinese student samp...In 21st Century, Chinese and American universities are experiencing great development in the number of students studying abroad. This research adopts the method of natural investigation, selecting Chinese student samples during study abroad program in the University of Minnesota to complete the designed questionnaires to examine the intercultural interventions taken before, during and after this type of study abroad in Chinese universities. Also, after students complete the questionnaires, email communication is made to analyze the reasons for their answers to the questionnaires. The questionnaire results and email communication show that there is a great gap in the practice of intercultural interventions in study abroad programs between Chinese universities and students expectations. It is time for Chinese universities to design appropriate intercultural interventions in order to maximize Chinese university students' intercultural development during study abroad. These intercultural interventions should be run consistently to cover the phrases of pre-departure, during and after the study abroad program. Also, more dynamic and interactive intercultural interventions rather than knowledge-based intercultural instructions or guidance should be the focus for intercultural interventions.展开更多
Objective: To explore the possibility of repairi ng long segmental bone defects and preventing infection with cefazolin loaded bo ne matrix gelatin (C-BMG).Methods: C-BMG was made from putting cefazolin into BMG by va...Objective: To explore the possibility of repairi ng long segmental bone defects and preventing infection with cefazolin loaded bo ne matrix gelatin (C-BMG).Methods: C-BMG was made from putting cefazolin into BMG by vac uum absorption and lyophilization techniques. The sustaining period of effective drug concentration in vitro and in vivo was detected. The time of inhibiting ba cteria,and the drug concentration in local tissues (bone and muscle) and plasma after implantation of C-BMG were examined by high performance liquid chromatog raphy. Results: The effective inhibition time to staphylococcus aureus of C-BMG was 22 days in vitro; while 14 days in vivo. The cefazolin concentrat ion in local tissues was higher in early stage,and later it kept a stable and l ow drug release. C-BMG showed an excellent ability to repair segmental long bon e defects.Conclusions: C-BMG can gradually release cefazolin with effect ive drug concentration and has excellent ability to repair segmental bone defect s. It can be used to repair segmental long bone defects and prevent infection af ter operation.展开更多
Hyaluronan is a widely occurring extracellular matrix molecule,which is not only a supporting structural component,but also an active regulator of cellular functions.The chemophysical and biological properties of hyal...Hyaluronan is a widely occurring extracellular matrix molecule,which is not only a supporting structural component,but also an active regulator of cellular functions.The chemophysical and biological properties of hyaluronan are greatly affected by its molecular size and several hyaluronan-binding proteins,making hyaluronan a fascinating molecule with great functional diversity.This review summarizes our current understanding of the roles of hyaluronan in cardiovascular and nervous system disorders,such as atherosclerosis,myocardial infarction,and stroke,with the aim to provide a foundation for future research and clinical trials.展开更多
Three different nanorod-like gallium oxides with mono/poly-crystalline nature(α, β, and α/β-Ga2O3) were prepared by regulating the amount of polyethylene glycol(PEG) 6000 in the range of 0.2–0.8 g proportionally ...Three different nanorod-like gallium oxides with mono/poly-crystalline nature(α, β, and α/β-Ga2O3) were prepared by regulating the amount of polyethylene glycol(PEG) 6000 in the range of 0.2–0.8 g proportionally via a hydrothermal method combined with further calcination. The bandgap of the products, given by UV-Vis diffuse reflectance spectra(UV-Vis DRS), was in the order of α-Ga2O3 > α/β-Ga2O3 > β-Ga2O3. To further investigate the photocatalysis performance of the catalysts, the decomposition of rhodamine B(Rh B) by Ga2O3 under UV light illumination(λ < 387 nm) was presented and complete degradation could be achieved within 30 min, a result that showed the highest efficiency. The photocatalytic oxidation mechanism is further discussed and prominently related to the active species: hydroxyl radical(·OH) and superoxide radical(O·-2), which were confirmed by electron paramagnetic resonance(EPR).展开更多
In order to promote the light output powers of GaN-based light emitting diodes (LEDs), two kinds of novel corrosive liquidshave been developed in this paper to roughen the surface of the indium tin oxide (ITO) current...In order to promote the light output powers of GaN-based light emitting diodes (LEDs), two kinds of novel corrosive liquidshave been developed in this paper to roughen the surface of the indium tin oxide (ITO) current spreading layer of LEDs. As aresult, the textured transparent ITO layer greatly enhanced the external quantum efficiency of the LEDs. Provided that a wafersample was dipped in a kind of corrosive liquid developed by us for only about 60 s, the light output powers of the LEDs canbe promoted by 24.7%, compared with conventional GaN-based LEDs. It is obvious that the presented method is simple, rapidand cost-effective.展开更多
A high performance heterojunction organic ultraviolet photodetector based on NPB and Bphen has been fabricated. A trans- parent conducting polymer PEDOT:PSS coated quartz substrate instead of ITO coated glass substra...A high performance heterojunction organic ultraviolet photodetector based on NPB and Bphen has been fabricated. A trans- parent conducting polymer PEDOT:PSS coated quartz substrate instead of ITO coated glass substrate as anode is propitious to detect shorter wavelength ultraviolet light. As a result, the device shows a low dark current density, a high responsivity of 502 mA/W and a detectivity of 2.67x1012 cm Hz1/Zfw which is illuminated by a 220 nm ultraviolet light with an intensity of 1.6 mW/cm2. Moreover, the performance of the PEDOT:PSS transparent electrode device is better than the semi-transparent A1 electrode device electrode because of the higher transmittance and electrode properties.展开更多
A photochromic rhodamine B-based material containing Cd(Ⅱ) as bridge was facilely prepared. The 4-methoxylsalicylalde hyde rhodamine B bydrazone Cd(Ⅱ) complex displayed unusual ring-open response upon 365 nm UV ...A photochromic rhodamine B-based material containing Cd(Ⅱ) as bridge was facilely prepared. The 4-methoxylsalicylalde hyde rhodamine B bydrazone Cd(Ⅱ) complex displayed unusual ring-open response upon 365 nm UV irradiation, exhibiting long photochromic lifetime and good fatigue resistance. The UV-induced ring-open of the complex led to a distinct color and fluorescence change in acetonitrile. A new mechanism was put forward: salicylaldehyde part in the complex underwent UV-promoted isomerization from enol-form to keto-form, enhancing the chelation of Cd(Ⅱ) and yielding the ring-opening rhodamine B part. Compared to other reported photochromic systems, this new photochromic material offered attractive new insights into the development of low cost photochromic materials with good performance.展开更多
文摘The forbidden pitch "dip" in the critical dimension (CD) through the pitch curve is a well-known optical proximity effect. The CD and CD process window near the "dip",usually found near a pitch range of 1.1 to 1.4 wavelength/ NA (numerical aperture),is smaller when compared with other pitches. This is caused by inadequate imaging contrast for an unequal line and space grating. Although this effect is relatively well-known, its relationship with typical process condition parameters,such as the effective image blur caused by the photo-acid diffusion during the post exposure bake or the aberration in the imaging lens, has not been systematically studied. In this paper, we will examine the correlation between the image blur and the effect on the CD, including the decrease in the CD value (the depth of the "dip") and the CD process window. We find that both the decrease in the CD value and the focus latitude near the forbidden pitch correlate very well with the effective Gaussian image blur. Longer effective diffusion length correlates well with a smaller process window and a deeper CD "dip". We conclude that the dip depth is very sensitive to the change in image contrast.
文摘Gelatinase A (MMP-2) is considered to play a critical role in cell migration and invasion. The proteinase is secreted from the cell as an inactive zymogen. In vivo it is postulated that activation of progelationase A (proMMP-2) takes place on the cell surface mediated by membrane-type matrix metalloproteinases (MT-MMPs). Recent studies have demonstrated that proMMP-2 is recruited to the cell surface by interacting with tissue inhibitor of metalloproteinases-2 (TIMP-2) bound to MT1MMP by forming a ternary complex. bee MT1-MMP closely located to the ternary complex then activates proMMP-2 on the cell surface. MT1-MMP is found in cultured invasive cancer cells at the invadopodia. The MTMMP/TIMP-2/ MMP- 2 system t bus provides localized expression of proteolysis of the extracellular matrix required for cell migration.
基金Supported by the National Natural Science Foundation of China(60474022)
文摘We have given a semantic extension of lattice-valued propositional logic LP(X) in [6]. In this paper, we investigate its corresponding syntactic extension of LP(X) and give the relations between these two extensions.
基金This work was supported by the National Natural Science Foundation of China under Crants No. 60842002, No. 61272542, No. 60903018, No. 61103183, No. 61103184 the National High- Tech Research and Development Plan of China under Ca'ant No. 2007AA01Z409+1 种基金 the Fundamental Research Funds for the Central Universities under Crants No. 2009B21114, No. 20101307114 the "Six Talent Peaks Program" of Jiangsu Province of China under Crant No. 2009182 and Program for New Century Excellent Talents in Hohai University.
文摘In order to ensure the security of the property-based remote attestation scheme, an improved, more efficient, forrml security model of property-based remote attestation is proposed, with which we prove that the user platform satis- fies the security property requirements predefmed by a remote relying party. Under the co-Corrtautational Diffie-Helknan (CDH) assumption, the proposed scheme is proved to be secure in the random oracle model. Compared with the existing schemes, the proposed scheme has a short property certificate and signature size, and requires less computational cost.
基金Supported by the Nature Science Foundation of China under Grant Nos.10875003 and 10811240152the calculations are supported by CERNET High Performance Computing Center in China
文摘We propose a quantization procedure for the nucleon-scMar meson system, in which an arbitrary mean scalar meson field Ф is introduced. The equivalence of this procedure with the usual one is proven for any given value of qS. By use of this procedure, the scalar meson field in the Walecka's MFA and in Chin's RHA are quantized around the mean field, Its corrections on these theories are considered by perturbation up to the second order. The arbitrariness of Ф makes us free to fix it at any stage in the calculation. When we fix it in the way of Walecka's MFA, the quantum corrections are big, and the result does not converge. When we fix it in the way of Chin's RHA, the quantum correction is negligibly small, and the convergence is excellent. It shows that RHA covers the leading part of quantum field theory for nuclear systems and is an excellent zeroth order approximation for further quantum corrections, while the Walecka's MFA does not. We suggest to fix the parameter Ф at the end of the whole calculation by minimizing the total energy per-nucleon for the nuclear matter or the total energy for the finite nucleus, to make the quantized relativistic mean field theory (QRMFT) a variational method.
文摘Nowadays, lighting design is the modern attractive field of professional activity. Although its theoretical and methodological bases are in the initial stage of formulation. Though there are standards for regulating illumination quantitatively, the science has never created a bridge to transfer illumination quantity into illumination quality. How to keep a day image of architectural object without imitating natural lighting? How unrecognizably to change the image, to make it extraordinary and catchy? This paper offers a solution in the form of external illumination designing principles. This paper proposes two conceptual ways of creating artificial lighting of buildings and constructions that pursue different goals: the principle of "tectonic" illumination and the principle of "decorative" illumination. These principles were developed based on the analysis of the state of the art experience of lighting architectural objects and author's empirical study. The latter contained measuring luminosity with luminance meter, processing the data, statistical survey (180 respondents) and lighting modeling in the laboratory of Moscow Architectural Institute.
文摘Eosinophilic cholangiopathy is a rare condition characterized by eosinophilic infiltration of the biliary tract and causes sclerosing cholangitis. We report a patient with secondary sclerosing cholangitis with eosinophilic cholecystitis. A 46-year-old Japanese man was admitted to our hospital with jaundice. Computed tomography revealed dilatation of both the intrahepatic and extrahepatic bile ducts, diffuse thickening of the wall of the extrahepatic bile duct, and thickening of the gallbladder wall. Under the diagnosis of lower bile duct carcinoma, he underwent pyloruspreserving pancreatoduodenectomy and liver biopsy. On histopathological examination, conspicuous fibrosis was seen in the lower bile duct wall. In the gallbladder wall, marked eosinophilic infiltration was seen. Liver biopsy revealed mild portal fibrosis. He was diagnosed as definite eosinophilic cholecystitis with sclerosing cholangitis with unknown etiology. The possible etiology of sderosing cholangitis was consequent fibrosis from previous eosinophilic infiltration in the bile duct. The clinicopathological findings of our case and a literature review indicated that eosinophilic cholangiopathy could cause a condition mimicking primary sclerosing cholangitis (PSC). Bile duct wall thickening in patients with eosinophilic cholangitis might be due to fibrosis of the bile duct wall. Eosinophilic cholangiopathy might be confused as PSC with eosinophilia.
文摘The objective of this study was characterizing the gelatin from the chicken feet by FTIR (Fourier transform infrared) spectroscopy. Two gelatin samples were prepared for the experiment which were extracted of 200 g of chicken feet by a thermal bath of 4% acetyl acid solution at 60 ℃. A commercial gelatin was used to compare the results. FTIR spectra of gelatin samples were recorded using a Nicolet iS5 FTIR spectrometer equipped with an ATR/iD3 with argon horizontal cell in which the spectra were varied in the range of 400-4,000 cm1 at 16 ~C. The results showed that FTIR spectra of the chicken feet gelatin had the most with the vibration peak at wave numbers of 1,652.01 cm~ to the amide I, of 1,539.87 cm1 to the amide II, of 1,241.29 cm~ to the amide III, of 2,923.72 cm-~ to the amide B and of 3,399.56 cm~ to the amide A. The collagen composition of the chicken feet gelatins was twotimes larger than the commercial gelatin and the vibration bands to beef gelatin have been different from chicken feet gelatins. This demonstrates that chicken feet gelatins are very good nutritional quality when compared to the commercial gelatin.
文摘In 21st Century, Chinese and American universities are experiencing great development in the number of students studying abroad. This research adopts the method of natural investigation, selecting Chinese student samples during study abroad program in the University of Minnesota to complete the designed questionnaires to examine the intercultural interventions taken before, during and after this type of study abroad in Chinese universities. Also, after students complete the questionnaires, email communication is made to analyze the reasons for their answers to the questionnaires. The questionnaire results and email communication show that there is a great gap in the practice of intercultural interventions in study abroad programs between Chinese universities and students expectations. It is time for Chinese universities to design appropriate intercultural interventions in order to maximize Chinese university students' intercultural development during study abroad. These intercultural interventions should be run consistently to cover the phrases of pre-departure, during and after the study abroad program. Also, more dynamic and interactive intercultural interventions rather than knowledge-based intercultural instructions or guidance should be the focus for intercultural interventions.
基金ThisprojectwassupportedbyagrantfromtheMinistryofHealth (No .96 1 14 5 )
文摘Objective: To explore the possibility of repairi ng long segmental bone defects and preventing infection with cefazolin loaded bo ne matrix gelatin (C-BMG).Methods: C-BMG was made from putting cefazolin into BMG by vac uum absorption and lyophilization techniques. The sustaining period of effective drug concentration in vitro and in vivo was detected. The time of inhibiting ba cteria,and the drug concentration in local tissues (bone and muscle) and plasma after implantation of C-BMG were examined by high performance liquid chromatog raphy. Results: The effective inhibition time to staphylococcus aureus of C-BMG was 22 days in vitro; while 14 days in vivo. The cefazolin concentrat ion in local tissues was higher in early stage,and later it kept a stable and l ow drug release. C-BMG showed an excellent ability to repair segmental long bon e defects.Conclusions: C-BMG can gradually release cefazolin with effect ive drug concentration and has excellent ability to repair segmental bone defect s. It can be used to repair segmental long bone defects and prevent infection af ter operation.
基金Project supported by the Key Research and Development Program of the Ministry of Science and Technology(No.2017YFC0111902)the Shanghai Natural Science Foundation(No.13ZR1404700),China
文摘Hyaluronan is a widely occurring extracellular matrix molecule,which is not only a supporting structural component,but also an active regulator of cellular functions.The chemophysical and biological properties of hyaluronan are greatly affected by its molecular size and several hyaluronan-binding proteins,making hyaluronan a fascinating molecule with great functional diversity.This review summarizes our current understanding of the roles of hyaluronan in cardiovascular and nervous system disorders,such as atherosclerosis,myocardial infarction,and stroke,with the aim to provide a foundation for future research and clinical trials.
基金funded by the National Natural Science Foundation of China(21377067,21177072,and 21207079)the Natural Science Foundation for the Innovation Group of Hubei Province,China(2009CDA020)
文摘Three different nanorod-like gallium oxides with mono/poly-crystalline nature(α, β, and α/β-Ga2O3) were prepared by regulating the amount of polyethylene glycol(PEG) 6000 in the range of 0.2–0.8 g proportionally via a hydrothermal method combined with further calcination. The bandgap of the products, given by UV-Vis diffuse reflectance spectra(UV-Vis DRS), was in the order of α-Ga2O3 > α/β-Ga2O3 > β-Ga2O3. To further investigate the photocatalysis performance of the catalysts, the decomposition of rhodamine B(Rh B) by Ga2O3 under UV light illumination(λ < 387 nm) was presented and complete degradation could be achieved within 30 min, a result that showed the highest efficiency. The photocatalytic oxidation mechanism is further discussed and prominently related to the active species: hydroxyl radical(·OH) and superoxide radical(O·-2), which were confirmed by electron paramagnetic resonance(EPR).
基金supported by the Natural Science Foundation of Guangdong Province, China (Grant Nos. 8251063101000007, 10151063101000009 and 9451063101002082)the Scientific & Technological Plan of Guangdong Province (Grant Nos. 2008B010200004, 2010B010600030 and 2009B011100003)+2 种基金the National Natural Science Foundation of China(Grant Nos. 61078046 and 10904042)the Key Project of Chinese Ministryof Education (Grant No. 210157)the Scientific & Technological Project of Education Department of Hubei Province (Grant No. D20101104)
文摘In order to promote the light output powers of GaN-based light emitting diodes (LEDs), two kinds of novel corrosive liquidshave been developed in this paper to roughen the surface of the indium tin oxide (ITO) current spreading layer of LEDs. As aresult, the textured transparent ITO layer greatly enhanced the external quantum efficiency of the LEDs. Provided that a wafersample was dipped in a kind of corrosive liquid developed by us for only about 60 s, the light output powers of the LEDs canbe promoted by 24.7%, compared with conventional GaN-based LEDs. It is obvious that the presented method is simple, rapidand cost-effective.
基金supported by the National Natural Science Foundation of China (Grant No. 50972007)the Beijing Municipal Natural Science Foundation (Grant No. 4092035)+3 种基金the National Basic Research Program of China (973 Program) of the Ministry of Science and Technology of China(Grant No. 2011CB932703)the National Science Fund for Distinguished Young Scholars (Grant No. 60825407)the Special Items Fund of the Beijing Municipal Commission of Educationthe Opened Fund of the State Key Laboratory of Integrated Optoelectronics
文摘A high performance heterojunction organic ultraviolet photodetector based on NPB and Bphen has been fabricated. A trans- parent conducting polymer PEDOT:PSS coated quartz substrate instead of ITO coated glass substrate as anode is propitious to detect shorter wavelength ultraviolet light. As a result, the device shows a low dark current density, a high responsivity of 502 mA/W and a detectivity of 2.67x1012 cm Hz1/Zfw which is illuminated by a 220 nm ultraviolet light with an intensity of 1.6 mW/cm2. Moreover, the performance of the PEDOT:PSS transparent electrode device is better than the semi-transparent A1 electrode device electrode because of the higher transmittance and electrode properties.
基金financially supported by the National Natural Science Foundation of China(21175079 and 21375074)
文摘A photochromic rhodamine B-based material containing Cd(Ⅱ) as bridge was facilely prepared. The 4-methoxylsalicylalde hyde rhodamine B bydrazone Cd(Ⅱ) complex displayed unusual ring-open response upon 365 nm UV irradiation, exhibiting long photochromic lifetime and good fatigue resistance. The UV-induced ring-open of the complex led to a distinct color and fluorescence change in acetonitrile. A new mechanism was put forward: salicylaldehyde part in the complex underwent UV-promoted isomerization from enol-form to keto-form, enhancing the chelation of Cd(Ⅱ) and yielding the ring-opening rhodamine B part. Compared to other reported photochromic systems, this new photochromic material offered attractive new insights into the development of low cost photochromic materials with good performance.