Pub Date : 2022-09-20DOI: 10.2174/2210298102666220920110106
Wen-bing Sheng, Bin Li, Yilin Peng, Ni Zeng, Qing-ying Yao, Cai-yun Peng, Wen Wang
The genus Flueggea Willd. belongs to the Euphorbiaceae family, and is widely distributed in Asia, South America, Oceania and Europe, with sixteen species. Several species, such as Flueggea suffruticosa and Flueggea virosa, have been used as traditional medicines in southeast Asia and Africa for a long time for their good medicinal effects in treating rheumatoid arthritis, traumatic injury and gastrointestinal disease etc. The characteristic chemical constituents of this genus are alkaloids and diterpenoids, which show antiviral, anti-inflammatory, analgesic, antitumor, antibacterial, antioxidant and neuroprotective activities. This review summarizes the traditional medicinal values, chemical constituents and pharmacological activities of genus Flueggea, in order to provide a useful reference for the follow-up research and application of the genus.
{"title":"A review of the medicinal uses, phytochemistry and pharmacology of genus Flueggea","authors":"Wen-bing Sheng, Bin Li, Yilin Peng, Ni Zeng, Qing-ying Yao, Cai-yun Peng, Wen Wang","doi":"10.2174/2210298102666220920110106","DOIUrl":"https://doi.org/10.2174/2210298102666220920110106","url":null,"abstract":"\u0000\u0000The genus Flueggea Willd. belongs to the Euphorbiaceae family, and is widely distributed in Asia, South America, Oceania and Europe, with sixteen species. Several species, such as Flueggea suffruticosa and Flueggea virosa, have been used as traditional medicines in southeast Asia and Africa for a long time for their good medicinal effects in treating rheumatoid arthritis, traumatic injury and gastrointestinal disease etc. The characteristic chemical constituents of this genus are alkaloids and diterpenoids, which show antiviral, anti-inflammatory, analgesic, antitumor, antibacterial, antioxidant and neuroprotective activities. This review summarizes the traditional medicinal values, chemical constituents and pharmacological activities of genus Flueggea, in order to provide a useful reference for the follow-up research and application of the genus.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"290 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116584533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-14DOI: 10.2174/2210298102666220914094544
C. Hajiyev, Demet Cilden‐Guler
Tuning the system noise covariance Q matrix for the single-frame method aided Kalman filtering algorithm. The covariance matching procedure of the measurement noise covariance, namely the R matrix, was processed in singular value decomposition (SVD), which is one of the single-frame methods. Develop the R and Q double covariance matching rule for the single-frame method aided Kalman filtering algorithm. The matching procedure of the measurement noise covariance, namely the R matrix, is processed in singular value decomposition (SVD), which is one of the single-frame methods. The second matching rule is defined in the second stage of the proposed EKF design. The matching rules are run simultaneously, which makes the filter capable of being robust against initialization errors, system noise uncertainties, and measurement malfunctions at the same time without an external filter design necessity. A single-frame method aided Kalman filtering algorithm based double covariance matching rule is presented in this paper. First, the measurement noise covariance matching is introduced using the SVD method that processes the R-adaptation inherently for the filtering stage. Second, the system noise covariance matching is described so as to have double covariance matching at the same time during the estimation procedure. The SVD-Aided AEKF becomes R- and Q-adaptive simultaneously by applying the Q-adaptation rule to the intrinsically R-adaptive SVD-aided EKF.
{"title":"Covariance Matching Based Adaptive Attitude Estimation of a Nano-Satellite Using SVD-Aided EKF","authors":"C. Hajiyev, Demet Cilden‐Guler","doi":"10.2174/2210298102666220914094544","DOIUrl":"https://doi.org/10.2174/2210298102666220914094544","url":null,"abstract":"\u0000\u0000Tuning the system noise covariance Q matrix for the single-frame method aided Kalman filtering algorithm.\u0000\u0000\u0000\u0000The covariance matching procedure of the measurement noise covariance, namely the R matrix, was processed in singular value decomposition (SVD), which is one of the single-frame methods.\u0000\u0000\u0000\u0000Develop the R and Q double covariance matching rule for the single-frame method aided Kalman filtering algorithm.\u0000\u0000\u0000\u0000The matching procedure of the measurement noise covariance, namely the R matrix, is processed in singular value decomposition (SVD), which is one of the single-frame methods. The second matching rule is defined in the second stage of the proposed EKF design.\u0000\u0000\u0000\u0000The matching rules are run simultaneously, which makes the filter capable of being robust against initialization errors, system noise uncertainties, and measurement malfunctions at the same time without an external filter design necessity.\u0000\u0000\u0000\u0000A single-frame method aided Kalman filtering algorithm based double covariance matching rule is presented in this paper. First, the measurement noise covariance matching is introduced using the SVD method that processes the R-adaptation inherently for the filtering stage. Second, the system noise covariance matching is described so as to have double covariance matching at the same time during the estimation procedure. The SVD-Aided AEKF becomes R- and Q-adaptive simultaneously by applying the Q-adaptation rule to the intrinsically R-adaptive SVD-aided EKF.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130534016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-09DOI: 10.2174/2210298102666220909110222
P. Ghosh, A. Nazir, Thamizharasan Sakthivel, M. A. Khan
Spatial variability of stable isotope ratios in water from River Ganges is preserved in aragonite or calcite present in otoliths and formed at equilibrium with ambient water. This technique is used in a set of long-whiskered catfish aragonite otoliths from four different locations along the course of River Ganges. Acid digestion of otolith and analysis of 13C and18O in these carbonates using an isotope ratio mass spectrometer allowed distinction of fish habitat and to provide an idea about environmental condition of water along the Ganges River. The 18O signature of otolith carbonate revealed distinct compositional trend denoting glacial water input in the upstream segment of Ganges, close to the water reservoir at Narora. However, the 13C values remained constant suggesting similar bicarbonate composition and food intake along the stream length. The 18O signature in otolith from Varanasi was unexpectedly lighter and showed tendency of catfish population to migrate upstream segment of the river. The fish from the Narora location, showed the lowest 18O values, denoting signature of water derived from the melting of glacier. The heavier 18O values were seen in the stock from Kanpur. The upstream migration of fish population is indicated from the 18O values of fish otolith from Varanasi and Bhagalpur. The Varanasi location shows aberration in 18O signature in otoliths and this exists because this catfish moves to other places to avoid anthropogenic stress at this location. The δ18O of otolith carbonate covary with average environmental temperature recorded at individual location and serve as an important thermometry for marking environmental condition and stress in changing climatic parameters along stream length of River Ganges and its tributaries.
{"title":"Stable isotopic analysis of long-whiskered catfish (Sperata aor) otoliths for characterization of their habitat and relationship with water temperature in the Ganges River","authors":"P. Ghosh, A. Nazir, Thamizharasan Sakthivel, M. A. Khan","doi":"10.2174/2210298102666220909110222","DOIUrl":"https://doi.org/10.2174/2210298102666220909110222","url":null,"abstract":"\u0000\u0000Spatial variability of stable isotope ratios in water from River Ganges is preserved in aragonite or calcite present in otoliths and formed at equilibrium with ambient water. This technique is used in a set of long-whiskered catfish aragonite otoliths from four different locations along the course of River Ganges.\u0000\u0000\u0000\u0000Acid digestion of otolith and analysis of 13C and18O in these carbonates using an isotope ratio mass spectrometer allowed distinction of fish habitat and to provide an idea about environmental condition of water along the Ganges River. The 18O signature of otolith carbonate revealed distinct compositional trend denoting glacial water input in the upstream segment of Ganges, close to the water reservoir at Narora. However, the 13C values remained constant suggesting similar bicarbonate composition and food intake along the stream length.\u0000\u0000\u0000\u0000The 18O signature in otolith from Varanasi was unexpectedly lighter and showed tendency of catfish population to migrate upstream segment of the river. The fish from the Narora location, showed the lowest 18O values, denoting signature of water derived from the melting of glacier. The heavier 18O values were seen in the stock from Kanpur. The upstream migration of fish population is indicated from the 18O values of fish otolith from Varanasi and Bhagalpur. The Varanasi location shows aberration in 18O signature in otoliths and this exists because this catfish moves to other places to avoid anthropogenic stress at this location.\u0000\u0000\u0000\u0000The δ18O of otolith carbonate covary with average environmental temperature recorded at individual location and serve as an important thermometry for marking environmental condition and stress in changing climatic parameters along stream length of River Ganges and its tributaries.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116311517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-09DOI: 10.2174/2210298102666220909113827
Qingshuang Xie, Xing Liu, Lin Guan
This work reported a 405 nm photodetector based on the thermal evaporated CsPbBr3-CsPb2Br5 compound thin film. The post-annealing process of the CsPbBr3-CsPb2Br5 compound thin film prepared by thermal evaporation method has been improved in this work. To enhance the crystallization and photoresponse properties of the thin films, dimethyl sulfoxide (DMSO) steam was used in post-annealing process, instead of using the previous way that increased the annealing temperature. The CsPbBr3-CsPb2Br5 compound powder was deposited directly on surface glass substrate by thermal evaporation to form CsPbBr3-CsPb2Br5 compound thin film. The thin films were post-annealed at 150 oC for 15 min to crystallize. The DMSO liquid was dropped on the substrate, and then the liquid would be evaporated completely to become DMSO steam during 150 oC post-annealing. The DMSO steam would cover the thin film completely to help the crystallization. Finally, the gold electrodes were deposited on surface of thin films with a conductive channel of 1 mm * 100 µm. Results showed that the crystalline quality of the thin film after DMSO steam annealing was greatly improved compared with that of thin film without DMSO steam annealing. The energy gap was between 2.355 eV and 2.293 eV, which was similar to the previous report. In addition, under 405 nm excitation, the photocurrent of the thin film annealed in DMSO steam showed the rapid response (35 ms), good light radiation power dependence of the photocurrent and the improved responsivity. Especially, the responsivity at 3 V bias of the thin film annealed in DMSO steam increased to 1.5 times that of the thin film without DMSO steam annealing and even 4.5 times that of as-deposited film. A 405 nm photodetector based on the thermal evaporated CsPbBr3-CsPb2Br5 compound thin film was prepared successfully. The newest report has improved the preparation process of CsPbBr3-CsPb2Br5 compound thin films, where low annealing temperature with the DMSO steam assisted post-annealing process was used. The thin film annealed in DMSO steam possesses high crystalline quality and enhanced photoresponse performances, compared with thin film without DMSO steam annealing.
{"title":"A 405 nm photodetector based on the CsPbBr3-CsPb2Br5 compound thin film","authors":"Qingshuang Xie, Xing Liu, Lin Guan","doi":"10.2174/2210298102666220909113827","DOIUrl":"https://doi.org/10.2174/2210298102666220909113827","url":null,"abstract":"\u0000\u0000This work reported a 405 nm photodetector based on the thermal evaporated CsPbBr3-CsPb2Br5 compound thin film.\u0000\u0000\u0000\u0000The post-annealing process of the CsPbBr3-CsPb2Br5 compound thin film prepared by thermal evaporation method has been improved in this work. To enhance the crystallization and photoresponse properties of the thin films, dimethyl sulfoxide (DMSO) steam was used in post-annealing process, instead of using the previous way that increased the annealing temperature.\u0000\u0000\u0000\u0000The CsPbBr3-CsPb2Br5 compound powder was deposited directly on surface glass substrate by thermal evaporation to form CsPbBr3-CsPb2Br5 compound thin film. The thin films were post-annealed at 150 oC for 15 min to crystallize. The DMSO liquid was dropped on the substrate, and then the liquid would be evaporated completely to become DMSO steam during 150 oC post-annealing. The DMSO steam would cover the thin film completely to help the crystallization. Finally, the gold electrodes were deposited on surface of thin films with a conductive channel of 1 mm * 100 µm.\u0000\u0000\u0000\u0000Results showed that the crystalline quality of the thin film after DMSO steam annealing was greatly improved compared with that of thin film without DMSO steam annealing. The energy gap was between 2.355 eV and 2.293 eV, which was similar to the previous report. In addition, under 405 nm excitation, the photocurrent of the thin film annealed in DMSO steam showed the rapid response (35 ms), good light radiation power dependence of the photocurrent and the improved responsivity. Especially, the responsivity at 3 V bias of the thin film annealed in DMSO steam increased to 1.5 times that of the thin film without DMSO steam annealing and even 4.5 times that of as-deposited film.\u0000\u0000\u0000\u0000A 405 nm photodetector based on the thermal evaporated CsPbBr3-CsPb2Br5 compound thin film was prepared successfully. The newest report has improved the preparation process of CsPbBr3-CsPb2Br5 compound thin films, where low annealing temperature with the DMSO steam assisted post-annealing process was used. The thin film annealed in DMSO steam possesses high crystalline quality and enhanced photoresponse performances, compared with thin film without DMSO steam annealing.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128887177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-07DOI: 10.2174/1573399819666220907140754
Ö. Arar, Cesur Mehenktaş
The primary sources of nitrate contamination in groundwater resources are excessive fertilizer use and unregulated land discharges of treated wastewater. Because of its harmful nature to human health and its contribution to eutrophication, the removal of nitrate from water has been of great interest in the last decades. Various techniques such as adsorption, ion exchange, catalytic and biological denitrification, and membrane processes have been applied for NO3- removal. In this review paper, the removal of NO3- by membrane processes, including electrodialysis (ED), electrodeionization (EDI), reverse osmosis (RO), and ultrafiltration, have been reviewed. The pressure-driven membrane and electro-membrane processes applications to NO3- removal have been reviewed. The effect of process parameters, interferences, and limitations of membrane processes have been summed up. Membrane processes could be a promising alternative for NO3- removal. After suitable membrane preparation/modification, the nitrate removal rate could reach >99%.
{"title":"Application of Membrane Processes for Nitrate (NO3-) Removal","authors":"Ö. Arar, Cesur Mehenktaş","doi":"10.2174/1573399819666220907140754","DOIUrl":"https://doi.org/10.2174/1573399819666220907140754","url":null,"abstract":"\u0000\u0000The primary sources of nitrate contamination in groundwater resources are excessive fertilizer use and unregulated land discharges of treated wastewater. Because of its harmful nature to human health and its contribution to eutrophication, the removal of nitrate from water has been of great interest in the last decades. Various techniques such as adsorption, ion exchange, catalytic and biological denitrification, and membrane processes have been applied for NO3- removal.\u0000\u0000\u0000\u0000In this review paper, the removal of NO3- by membrane processes, including electrodialysis (ED), electrodeionization (EDI), reverse osmosis (RO), and ultrafiltration, have been reviewed.\u0000\u0000\u0000\u0000The pressure-driven membrane and electro-membrane processes applications to NO3- removal have been reviewed.\u0000\u0000\u0000\u0000The effect of process parameters, interferences, and limitations of membrane processes have been summed up.\u0000\u0000\u0000\u0000Membrane processes could be a promising alternative for NO3- removal. After suitable membrane preparation/modification, the nitrate removal rate could reach >99%.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114324586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-29DOI: 10.2174/2210298102666220829121101
J. Rezaeian, R. A. Foroutan, Mahmoud Gholami Sarokolaei
Although many scholars have argued that the key factor for success in e-commerce is the deployment of the trusted and reliable process for the buyer, the meaning of the customer trust in e-commerce and factors affecting it are not still well-known and to be investigated. Understanding how customers build their trust and developing a trust model is beneficial to increase the ability to do so. The aim of this study was to investigate whether the factors such as cognitive and affective trust can affect customer behavior in online shopping or not. Questionnaire was used to collect data and to check their normality, the Kolmogorov–Smirnov test was applied. Cronbach’s alpha was employed to test the reliability and the Structural Equation Model (SEM) was utilized to confirm or reject the hypotheses. Inferential statistical analysis was performed using SmartPLS software. While perceived website quality can affect cognitive trust, variables like security and privacies policy, and shared value of a website can influence affective trust. In addition, there are variables like prior-interaction experience, and perceived reputation of an e-tail which can impact on both cognitive and affective trust. On the other hand, it was shown that both cognitive and affective trust can influence customer satisfaction; a variable which along with internet usage experience, and online shopping experience affect loyalty intention. The empirical results show that cognitive and affective trust are prominent variables in online retailing. They mediate between PWQ, SPP, PIE, PETR, and SV on the one hand and CS on the other hand. In addition, CS influences LI. The same is true for OSE and IE.
{"title":"Online Customer Behavior: An Analysis of the Effects of Cognitive and Affective Trust","authors":"J. Rezaeian, R. A. Foroutan, Mahmoud Gholami Sarokolaei","doi":"10.2174/2210298102666220829121101","DOIUrl":"https://doi.org/10.2174/2210298102666220829121101","url":null,"abstract":"\u0000\u0000Although many scholars have argued that the key factor for success in e-commerce is the deployment of the trusted and reliable process for the buyer, the meaning of the customer trust in e-commerce and factors affecting it are not still well-known and to be investigated. Understanding how customers build their trust and developing a trust model is beneficial to increase the ability to do so.\u0000\u0000\u0000\u0000The aim of this study was to investigate whether the factors such as cognitive and affective trust can affect customer behavior in online shopping or not.\u0000\u0000\u0000\u0000Questionnaire was used to collect data and to check their normality, the Kolmogorov–Smirnov test was applied. Cronbach’s alpha was employed to test the reliability and the Structural Equation Model (SEM) was utilized to confirm or reject the hypotheses. Inferential statistical analysis was performed using SmartPLS software.\u0000\u0000\u0000\u0000While perceived website quality can affect cognitive trust, variables like security and privacies policy, and shared value of a website can influence affective trust. In addition, there are variables like prior-interaction experience, and perceived reputation of an e-tail which can impact on both cognitive and affective trust. On the other hand, it was shown that both cognitive and affective trust can influence customer satisfaction; a variable which along with internet usage experience, and online shopping experience affect loyalty intention.\u0000\u0000\u0000\u0000The empirical results show that cognitive and affective trust are prominent variables in online retailing. They mediate between PWQ, SPP, PIE, PETR, and SV on the one hand and CS on the other hand. In addition, CS influences LI. The same is true for OSE and IE.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125298168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-23DOI: 10.2174/2210298102666220823152953
Linrong Meng, T. Hao, Xintai Su, Xue Li, Guofeng Wang
This paper reports a versatile bentonite clay-mediated growth method for selectively synthesizing zero-dimensional -Fe2O3 nanoparticles and one-dimensional -Fe2O3 nanorods. In such a growth process without any other surfactant or additive, the bentonite clay is not only used as the supporter, but also as a shape mediator for -Fe2O3 nanocrystals. The products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The as-prepared products were used to investigate their promising adsorptive and photocatalytic applications in water treatment. According to the Langmuir equation, the maximum adsorption capacity of the -Fe2O3/bentonite composite for Congo red (CR) is calculated to be 96.9 mg•g-1. Furthermore, the -Fe2O3/bentonite nanocomposites also show an excellent photocatalytic property in the degradation of methyl orange (MO). This facile and novel synthesis method has the potential to be applied to prepare the low-cost -Fe2O3/bentonite nanocomposite for the removal of CR and MO.
{"title":"Clay-derived Synthesis of Supported -Fe2O3 Nanoparticles: Shape, Adsorption, and Photo-catalysis","authors":"Linrong Meng, T. Hao, Xintai Su, Xue Li, Guofeng Wang","doi":"10.2174/2210298102666220823152953","DOIUrl":"https://doi.org/10.2174/2210298102666220823152953","url":null,"abstract":"\u0000\u0000This paper reports a versatile bentonite clay-mediated growth method for selectively synthesizing zero-dimensional -Fe2O3 nanoparticles and one-dimensional -Fe2O3 nanorods.\u0000\u0000\u0000\u0000In such a growth process without any other surfactant or additive, the bentonite clay is not only used as the supporter, but also as a shape mediator for -Fe2O3 nanocrystals. The products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM).\u0000\u0000\u0000\u0000The as-prepared products were used to investigate their promising adsorptive and photocatalytic applications in water treatment. According to the Langmuir equation, the maximum adsorption capacity of the -Fe2O3/bentonite composite for Congo red (CR) is calculated to be 96.9 mg•g-1. Furthermore, the -Fe2O3/bentonite nanocomposites also show an excellent photocatalytic property in the degradation of methyl orange (MO).\u0000\u0000\u0000\u0000This facile and novel synthesis method has the potential to be applied to prepare the low-cost -Fe2O3/bentonite nanocomposite for the removal of CR and MO.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127194874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-18DOI: 10.2174/2210298102666220818161156
Júlio Goulart dos Santos, Lenner Santos Rodrigues, R. J. Ramos, A. Marletta, E. M. Therézio
This work investigates the photoluminescence properties of poly(3-octylthiophene), namely P3OT films, under excitation power and time light expositions. When exposed to monochromatic illumination, the degradation mechanism of P3OT films is precise in environmental conditions. However, in some environmental controlled or non-environmental conditions, the quenching luminescence of P3OT subject to monochromatic light excitation is not fully understood. In this context, it is necessary to understand what causes quenching luminescence of P3OT films under environmental conditions. The P3OT was synthesized by chronocoulometry, using tetraethylammonium tetrafluoroborate and lithium perchlorate as supporting electrolytes, and after it is deposited on a conductive substrate of fluoride-doped tin oxide (FTO). The films were synthesized and maintained under an argon atmosphere, and their thickness is dependent on the charge. The characterisation was achieved by applying techniques like UV-Vis absorption spectroscopy, photoluminescence, and emission ellipsometry. The UV-Vis absorption measurements demonstrated a different interaction of polymer/dopant due to the polaronic band. The results showed that photoluminescence quenching with time is a behaviour caused by energy transfer between quinone chains and pristine chains of the P3OT. The polarised emission measurements corroborate the hypothesis of energy transfer between chains. The emission ellipsometry technique was used to understand energy transfer processes and other properties. The self-absorption phenomenon and integrated PL investigation of the P3OT emission elucidated the mechanism involved in the observed properties. Besides that, the results show that the photoluminescence quenching happens in non-environmental and environmental conditions, corroborating the hypothesis that PL quenching occurs because self-absorption phenomena influence the energy transfer mechanism.
{"title":"Is it photodegradation or other electronic mechanisms responsible for photoluminescence quenching under nonenvironmental conditions in poly(3-octyltiophene) electrochemically synthesised?","authors":"Júlio Goulart dos Santos, Lenner Santos Rodrigues, R. J. Ramos, A. Marletta, E. M. Therézio","doi":"10.2174/2210298102666220818161156","DOIUrl":"https://doi.org/10.2174/2210298102666220818161156","url":null,"abstract":"\u0000\u0000This work investigates the photoluminescence properties of poly(3-octylthiophene), namely P3OT films, under excitation power and time light expositions. When exposed to monochromatic illumination, the degradation mechanism of P3OT films is precise in environmental conditions. However, in some environmental controlled or non-environmental conditions, the quenching luminescence of P3OT subject to monochromatic light excitation is not fully understood. In this context, it is necessary to understand what causes quenching luminescence of P3OT films under environmental conditions. The P3OT was synthesized by chronocoulometry, using tetraethylammonium tetrafluoroborate and lithium perchlorate as supporting electrolytes, and after it is deposited on a conductive substrate of fluoride-doped tin oxide (FTO). The films were synthesized and maintained under an argon atmosphere, and their thickness is dependent on the charge. The characterisation was achieved by applying techniques like UV-Vis absorption spectroscopy, photoluminescence, and emission ellipsometry. The UV-Vis absorption measurements demonstrated a different interaction of polymer/dopant due to the polaronic band. The results showed that photoluminescence quenching with time is a behaviour caused by energy transfer between quinone chains and pristine chains of the P3OT. The polarised emission measurements corroborate the hypothesis of energy transfer between chains. The emission ellipsometry technique was used to understand energy transfer processes and other properties. The self-absorption phenomenon and integrated PL investigation of the P3OT emission elucidated the mechanism involved in the observed properties. Besides that, the results show that the photoluminescence quenching happens in non-environmental and environmental conditions, corroborating the hypothesis that PL quenching occurs because self-absorption phenomena influence the energy transfer mechanism.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130148867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-03DOI: 10.2174/2210298102666220803091238
Song Liu, Shufang Ma, Xin Huang, G. Wang, Bo Liu, Dou Wang, Huican Ouyang, Chaoming Xu, Sheng Wei Liu, Guo-Dong Wei, B. Han, X. Hao, Bingshe Xu
Finding a simple, energy-saving and low-cost synthesis method to process gallium oxide nanowires by CVD for solar-blind detector. Due to a bandgap of 4.5 ~ 4.9eV and a high breakdown field strength of 8 MV/cm, gallium oxide (Ga2O3) has great application prospects in solar blind ultraviolet detection and high-power devices. Notably, Ga2O3 NWs are currently the key research objects of solar-blind UV detection materials because of the characteristics of efficient photocarrier separation and collection, and the bandgap width perfectly matches the energy of deep ultraviolet photons. To find a simple method to synthesis Ga2O3 nanowire with smooth surface and uniform diameter, and the prepared single gallium oxide nanowire UV detector has high photoelectric conversion efficiency. Ga2O3 NWs are prepared on the SiO2/Si substrate by chemical vapor deposition (CVD) approach at low reaction temperature with gold particles serveing as the catalyst and gallium arsenide (GaAs) as a gallium source. X-ray diffraction and Raman spectroscopy characterization indicate the crystal structure of NWs is β-Ga2O3, and scanning electron microscope (SEM) characterization proves that the NWs have uniform diameter and smooth surface. Moreover, the high-resolution transmission electron microscopy (HRTEM) characterization shows that the material had high crystal quality. And the photoconductive solar-blind UV detector with a single Ga2O3 NW is prepared, showing the excellent performance of the high responsivity and external quantum efficiency. The effects of growth temperature and the size of gold catalyst on the morphology of β-Ga2O3 NWs have been investigated. The results show that with the reaction temperature is 625℃ and the diameter of Au catalyst is about 30~50 nm, it is more conducive to the formation of NMs with crystal structure, smooth surface and uniform diameter. And the performance of the solar-blind UV photodetector show that the device has higher sensitivity (R=149.82A/W), external quantum efficiency (EQE=73206%), response rate τrise=0.66s, and τdowm=0.45s.
{"title":"CVD approach to a single gallium oxide nanowire for solar-blind UV detector.","authors":"Song Liu, Shufang Ma, Xin Huang, G. Wang, Bo Liu, Dou Wang, Huican Ouyang, Chaoming Xu, Sheng Wei Liu, Guo-Dong Wei, B. Han, X. Hao, Bingshe Xu","doi":"10.2174/2210298102666220803091238","DOIUrl":"https://doi.org/10.2174/2210298102666220803091238","url":null,"abstract":"\u0000\u0000Finding a simple, energy-saving and low-cost synthesis method to process gallium oxide nanowires by CVD for solar-blind detector.\u0000\u0000\u0000\u0000Due to a bandgap of 4.5 ~ 4.9eV and a high breakdown field strength of 8 MV/cm, gallium oxide (Ga2O3) has great application prospects in solar blind ultraviolet detection and high-power devices. Notably, Ga2O3 NWs are currently the key research objects of solar-blind UV detection materials because of the characteristics of efficient photocarrier separation and collection, and the bandgap width perfectly matches the energy of deep ultraviolet photons.\u0000\u0000\u0000\u0000To find a simple method to synthesis Ga2O3 nanowire with smooth surface and uniform diameter, and the prepared single gallium oxide nanowire UV detector has high photoelectric conversion efficiency.\u0000\u0000\u0000\u0000Ga2O3 NWs are prepared on the SiO2/Si substrate by chemical vapor deposition (CVD) approach at low reaction temperature with gold particles serveing as the catalyst and gallium arsenide (GaAs) as a gallium source.\u0000\u0000\u0000\u0000X-ray diffraction and Raman spectroscopy characterization indicate the crystal structure of NWs is β-Ga2O3, and scanning electron microscope (SEM) characterization proves that the NWs have uniform diameter and smooth surface. Moreover, the high-resolution transmission electron microscopy (HRTEM) characterization shows that the material had high crystal quality. And the photoconductive solar-blind UV detector with a single Ga2O3 NW is prepared, showing the excellent performance of the high responsivity and external quantum efficiency.\u0000\u0000\u0000\u0000The effects of growth temperature and the size of gold catalyst on the morphology of β-Ga2O3 NWs have been investigated. The results show that with the reaction temperature is 625℃ and the diameter of Au catalyst is about 30~50 nm, it is more conducive to the formation of NMs with crystal structure, smooth surface and\u0000 \u0000uniform diameter. And the performance of the solar-blind UV photodetector show that the device has higher sensitivity (R=149.82A/W), external quantum efficiency (EQE=73206%), response rate τrise=0.66s, and τdowm=0.45s.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117070330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The existence of cloud pixels reduces the practicability of optical satellite remote sensing data. Existing cloud reconstruction methods generally cannot solve the following problems:(1)Large-scale thick cloud cannot be well reconstructed. (2)There are high requirements for reconstructed data. (3)Most data used to reconstructed are single temporal images. In order to overcome these problems, a new multi temporal weighted aggregation method is proposed. Specifically, we adopt a multi-temporal iterative aggregation method for cloud pixels to reconstruct and a multi-temporal weighted aggregation method for cloud shadow pixels to reconstruct. Finally, the experiment proves that our method can quickly and accurately complete the cloud reconstruction, and under the effective uniform color strategy, a cloud- free image with accurate geometric position and uniform gray scale can be obtained. Experiments prove that the pixel reconstruction method proposed in this paper has achieved good cloud and cloud shadow pixel reconstruction effects in different types of ground objects.
{"title":"Multi-temporal cloud pixels reconstruction method for optical remote sensing satellite images","authors":"Huiqian Liu, Ruofei Zhong, Haiyin Wang, Shiyong Wu, Qingyang Li, Cankun Yang","doi":"10.2174/2210298102666220616114622","DOIUrl":"https://doi.org/10.2174/2210298102666220616114622","url":null,"abstract":"\u0000\u0000The existence of cloud pixels reduces the practicability of optical satellite remote sensing data.\u0000\u0000\u0000\u0000Existing cloud reconstruction methods generally cannot solve the following problems:(1)Large-scale thick cloud cannot be well reconstructed. (2)There are high requirements for reconstructed data. (3)Most data used to reconstructed are single temporal images.\u0000\u0000\u0000\u0000In order to overcome these problems, a new multi temporal weighted aggregation method is proposed. Specifically, we adopt a multi-temporal iterative aggregation method for cloud pixels to reconstruct and a multi-temporal weighted aggregation method for cloud shadow pixels to reconstruct.\u0000\u0000\u0000\u0000Finally, the experiment proves that our method can quickly and accurately complete the cloud reconstruction, and under the effective uniform color strategy, a cloud- free image with accurate geometric position and uniform gray scale can be obtained.\u0000\u0000\u0000\u0000Experiments prove that the pixel reconstruction method proposed in this paper has achieved good cloud and cloud shadow pixel reconstruction effects in different types of ground objects.\u0000","PeriodicalId":184819,"journal":{"name":"Current Chinese Science","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127370283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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