The epizoic diatoms,especifically those living at the body surface of copepods has not garnered sufficient attention.This study focuses on the copepod Pseudodiaptomus annandalei and three epizoic diatom species isolat...The epizoic diatoms,especifically those living at the body surface of copepods has not garnered sufficient attention.This study focuses on the copepod Pseudodiaptomus annandalei and three epizoic diatom species isolated from its body surface:Pseudofalcula hyalina,Haslea sp.,and Tabularia sp.The research explored the physiological and biochemical characteristics of diatoms under co cultivation conditions with P.annandalei and different species of epizoic diatoms,along with variations in copepod survival rates.Results reveal that the growth rate,cell density,and chlorophyll-a content of the three epizoic diatoms were enhanced by P.annandalei.The photosynthesis of epizoic diatoms,particularly the photochemical efficiency of PSⅡ(F_(v)/F_(m))of P.hyalina was positively influenced by P.annandalei.The impact of P.annandalei on biochemical compositions exhibited species-specific characteristics.Under co-culture conditions,the content of polysaccharides and proteins in the colloidal exopolymeric substance(CEPS)of P.hyalina and Haslea sp.increased,so did the intracellular protein content of Tabularia sp.The attachment of P.hyalina was most significantly influenced by P.annandalei,followed by Haslea sp.,and then Tabularia sp.,likely due to the increased uronic acid content of P.hyalina under co-culture conditions.Moreover,the three epizoic diatoms might have served as food sources for P.annandalei,as evidenced by the higher survival of copepods.The release of nitrate and phosphate from P.annandalei contributed to the nutrition for the growth of epizoic diatoms,indicating that the bottom-up effect resulting from P.annandalei excretion nutrition was greater than the top-down effect from predation.展开更多
The lower head of reactor pressure vessel （RPV） will endure a great temperature gradient above the phase transition temperature, and the creep and fracture will be the primary failure mode for the RPV material in su...The lower head of reactor pressure vessel （RPV） will endure a great temperature gradient above the phase transition temperature, and the creep and fracture will be the primary failure mode for the RPV material in such a situation. The interrupted creep tests were performed on a typical RPV material, SA508 Gr3 steel, at 800 ℃. The microstructure of different creep stages was examined by scanning electron microscopy and transmission electron microscopy. The results showed that the microscopic damage is mainly induced by creep cavities and coarse second-phase particles. Furthermore, the volume fractions of creep cavities and coarse second-phase particles show a linear relationship with the extended creep time. The second-phase particles are determined to be MoC in the second creep stage and Mo2C in the third creep stage, according to the results of selected-area electron diffraction pattern. Combined with energy-dispersive spectrum analysis, the segregation of precipitates caused by the migration of atoms is finally unveiled, which leads to the coarsening of the particles.展开更多
Gear box places an important role rolling mill.Its reliability decides the machine operation.Due to the important role,if the key machine is broken because of gear box′s malfunction,the whole production devices will ...Gear box places an important role rolling mill.Its reliability decides the machine operation.Due to the important role,if the key machine is broken because of gear box′s malfunction,the whole production devices will be influeued.Therefore,it′s very important to monitor the gear box online.Good monitoring system can help companies to better process fault diagnosis.The design sets up a monitoring system with Enwatch polled mode on-line acquisition module and Odyssey software.By calculating the data,the problem of the monitoring system is find,the plans to collect signal is made,the problems of monitoring gear box′s multichannel vibration are solved and the malfunctions initially are estimated according to the signal,which has theoretical basis and practical meanings.展开更多
Large water pump motor,whose operation decides the reliability of the whole production line,plays a very important role.Therefore,its online condition monitoring can help companies better know its operation,process fa...Large water pump motor,whose operation decides the reliability of the whole production line,plays a very important role.Therefore,its online condition monitoring can help companies better know its operation,process fault analysis and protection.The essay mainly studies and designs large water pump motor′s real time vibration monitoring and fault diagnosis system.The essay completes the systems project design,the establishment of the system and performance test.Eddy-currentsensor,XM-120 vibration module,XM-320 axial translation module,XM-362 temperature module,XM-360 process amount module and XM-500 gateway module are used to measure the axial vibration and displacement of main motors.Laboratory tests prove that the system can meet the requirements of motor vibration monitoring.展开更多
The questions concerning vocabulary acquisition have been explored for years.Among all these researches,there is a basic assumption that learners can acquire words from incidental exposure to written texts.Quite a num...The questions concerning vocabulary acquisition have been explored for years.Among all these researches,there is a basic assumption that learners can acquire words from incidental exposure to written texts.Quite a number of empirical studies have testified the hypothesis,in which,the relationship between reading tasks and incidental vocabulary acquisition(IVA) has become an interest in the field of second language acquisition(SLA) studies.The present study presents some theories and studies about the positive effects of reading tasks on IVA and suggests future research on the related topics.展开更多
The Cask of Amontillado, which tells a story of revenge, is one of Edgar Allan Poe's masterpieces. The horrible and darksetting of the story, its theme of revenge, the description of the crazy character Fortunato ...The Cask of Amontillado, which tells a story of revenge, is one of Edgar Allan Poe's masterpieces. The horrible and darksetting of the story, its theme of revenge, the description of the crazy character Fortunato and the use of irony and symbols make it atypical Gothic fiction.展开更多
The study introduces the meanings of the technology on dedust fan′s online detection and fault diagnosis,the ways of fault diagnosis,the common fault analysis and the design of stealmaking gas dedust fan′s online fa...The study introduces the meanings of the technology on dedust fan′s online detection and fault diagnosis,the ways of fault diagnosis,the common fault analysis and the design of stealmaking gas dedust fan′s online fault diagnosis.It shows the whole system′s design,establishment and functional test.XM series modules have been used to realize the online fault diagnosis.The system′s functional requirements are proved by experiment.展开更多
The essay mainly studies a system of low frequency signal′s measurement and the extraction of its characteristic quantity,introduces how matlab analyzes and extracts low frequency signal.MATLAB,a visual programming s...The essay mainly studies a system of low frequency signal′s measurement and the extraction of its characteristic quantity,introduces how matlab analyzes and extracts low frequency signal.MATLAB,a visual programming software,designs testing program for mechanic vibration signal,analyzes and identifies vibration signal.The collected data shows the effectiveness of the system.Based on XM121 modules,the testing system collects and analyzes single channel signal.展开更多
This study analyzes the structural characteristics of wind-driven generator,concludes its comment malfunctions and proposes effective methods by general fault analysis methods,so as to design online detection and faul...This study analyzes the structural characteristics of wind-driven generator,concludes its comment malfunctions and proposes effective methods by general fault analysis methods,so as to design online detection and fault diagnosis system of wind-driven generator in virtual instrument.This work will realize real-time detection,help engineers to proceed remote fault diagnosis,reduce maintenance time and increase production efficiency.This study is meaningful and practical to develop a fault diagnosis system for wind-driven generators,which shows professionalization of fault diagnosis system.展开更多
The development of luminescent materials with excitation-dependent emission is essential for the applications of anti-counterfeiting and information security.However,this unique property has not yet been achieved due ...The development of luminescent materials with excitation-dependent emission is essential for the applications of anti-counterfeiting and information security.However,this unique property has not yet been achieved due to the ubiquitously accepted Kasha’s rule.Herein,cytosine(Cyt)is protonated as a countercation to construct a zero-dimensional(CytH)_(2)SnCl_(6) that emits a green afterglow for up to 1.0 s at room temperature.Upon doping with Te^(4+),(CytH)_(2)SnCl_(6):x%Te exhibits excitation-dependent emission because of the different optimal excitation wavelengths for the dual emissive centers CytH^(+)(approximately 350 nm)and Te^(4+)(approximately 330 and 390 nm).Moreover,the overlapping between the emission of CytH^(+)and absorption of Te^(4+)induces efficient resonant triplet energy transfer from CytH^(+)to Te^(4+),resulting in a tunable persistence time for the green afterglow produced by CytH^(+).Using excitationdependent emission and tunable afterglow persistence time,the potential of(CytH)_(2)SnCl_(6):x%Te was demonstrated in the application of anti-counterfeiting and information encryption.This study provides an effective strategy for endowing metal halide hybrids with multicolor luminescence.展开更多
基金Supported by the National Natural Science Foundation of China(No.42076114)the Second Batch of High-level Professional Groups of Vocational Colleges in Guangdong Province(No.GSPZYQ 2021004)the Guangxi Science and Technology Base and Talent Special Project(No.GUIKE AD 23026041)。
文摘The epizoic diatoms,especifically those living at the body surface of copepods has not garnered sufficient attention.This study focuses on the copepod Pseudodiaptomus annandalei and three epizoic diatom species isolated from its body surface:Pseudofalcula hyalina,Haslea sp.,and Tabularia sp.The research explored the physiological and biochemical characteristics of diatoms under co cultivation conditions with P.annandalei and different species of epizoic diatoms,along with variations in copepod survival rates.Results reveal that the growth rate,cell density,and chlorophyll-a content of the three epizoic diatoms were enhanced by P.annandalei.The photosynthesis of epizoic diatoms,particularly the photochemical efficiency of PSⅡ(F_(v)/F_(m))of P.hyalina was positively influenced by P.annandalei.The impact of P.annandalei on biochemical compositions exhibited species-specific characteristics.Under co-culture conditions,the content of polysaccharides and proteins in the colloidal exopolymeric substance(CEPS)of P.hyalina and Haslea sp.increased,so did the intracellular protein content of Tabularia sp.The attachment of P.hyalina was most significantly influenced by P.annandalei,followed by Haslea sp.,and then Tabularia sp.,likely due to the increased uronic acid content of P.hyalina under co-culture conditions.Moreover,the three epizoic diatoms might have served as food sources for P.annandalei,as evidenced by the higher survival of copepods.The release of nitrate and phosphate from P.annandalei contributed to the nutrition for the growth of epizoic diatoms,indicating that the bottom-up effect resulting from P.annandalei excretion nutrition was greater than the top-down effect from predation.
基金This research was supported by the National Natural Science Foundation of China （51575489） and National 13th Five-Year Key Technologies R＆D Program （No. 2016YFC0801902）.
文摘The lower head of reactor pressure vessel （RPV） will endure a great temperature gradient above the phase transition temperature, and the creep and fracture will be the primary failure mode for the RPV material in such a situation. The interrupted creep tests were performed on a typical RPV material, SA508 Gr3 steel, at 800 ℃. The microstructure of different creep stages was examined by scanning electron microscopy and transmission electron microscopy. The results showed that the microscopic damage is mainly induced by creep cavities and coarse second-phase particles. Furthermore, the volume fractions of creep cavities and coarse second-phase particles show a linear relationship with the extended creep time. The second-phase particles are determined to be MoC in the second creep stage and Mo2C in the third creep stage, according to the results of selected-area electron diffraction pattern. Combined with energy-dispersive spectrum analysis, the segregation of precipitates caused by the migration of atoms is finally unveiled, which leads to the coarsening of the particles.
文摘Gear box places an important role rolling mill.Its reliability decides the machine operation.Due to the important role,if the key machine is broken because of gear box′s malfunction,the whole production devices will be influeued.Therefore,it′s very important to monitor the gear box online.Good monitoring system can help companies to better process fault diagnosis.The design sets up a monitoring system with Enwatch polled mode on-line acquisition module and Odyssey software.By calculating the data,the problem of the monitoring system is find,the plans to collect signal is made,the problems of monitoring gear box′s multichannel vibration are solved and the malfunctions initially are estimated according to the signal,which has theoretical basis and practical meanings.
文摘Large water pump motor,whose operation decides the reliability of the whole production line,plays a very important role.Therefore,its online condition monitoring can help companies better know its operation,process fault analysis and protection.The essay mainly studies and designs large water pump motor′s real time vibration monitoring and fault diagnosis system.The essay completes the systems project design,the establishment of the system and performance test.Eddy-currentsensor,XM-120 vibration module,XM-320 axial translation module,XM-362 temperature module,XM-360 process amount module and XM-500 gateway module are used to measure the axial vibration and displacement of main motors.Laboratory tests prove that the system can meet the requirements of motor vibration monitoring.
文摘The questions concerning vocabulary acquisition have been explored for years.Among all these researches,there is a basic assumption that learners can acquire words from incidental exposure to written texts.Quite a number of empirical studies have testified the hypothesis,in which,the relationship between reading tasks and incidental vocabulary acquisition(IVA) has become an interest in the field of second language acquisition(SLA) studies.The present study presents some theories and studies about the positive effects of reading tasks on IVA and suggests future research on the related topics.
文摘The Cask of Amontillado, which tells a story of revenge, is one of Edgar Allan Poe's masterpieces. The horrible and darksetting of the story, its theme of revenge, the description of the crazy character Fortunato and the use of irony and symbols make it atypical Gothic fiction.
文摘The study introduces the meanings of the technology on dedust fan′s online detection and fault diagnosis,the ways of fault diagnosis,the common fault analysis and the design of stealmaking gas dedust fan′s online fault diagnosis.It shows the whole system′s design,establishment and functional test.XM series modules have been used to realize the online fault diagnosis.The system′s functional requirements are proved by experiment.
文摘The essay mainly studies a system of low frequency signal′s measurement and the extraction of its characteristic quantity,introduces how matlab analyzes and extracts low frequency signal.MATLAB,a visual programming software,designs testing program for mechanic vibration signal,analyzes and identifies vibration signal.The collected data shows the effectiveness of the system.Based on XM121 modules,the testing system collects and analyzes single channel signal.
基金supported by the following funding projects:Scientific Research Project of Jieyang Polytechnic(Project No.2019JYPCQB02)Science and Technology Project of Jieyang(Project No.sdzx002)。
文摘This study analyzes the structural characteristics of wind-driven generator,concludes its comment malfunctions and proposes effective methods by general fault analysis methods,so as to design online detection and fault diagnosis system of wind-driven generator in virtual instrument.This work will realize real-time detection,help engineers to proceed remote fault diagnosis,reduce maintenance time and increase production efficiency.This study is meaningful and practical to develop a fault diagnosis system for wind-driven generators,which shows professionalization of fault diagnosis system.
基金supported by the Guangdong Basic and Applied Basic Research Foundation(2022A1515110604)the Open Foundation of Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured Materials(2022GXYSOF14).
文摘The development of luminescent materials with excitation-dependent emission is essential for the applications of anti-counterfeiting and information security.However,this unique property has not yet been achieved due to the ubiquitously accepted Kasha’s rule.Herein,cytosine(Cyt)is protonated as a countercation to construct a zero-dimensional(CytH)_(2)SnCl_(6) that emits a green afterglow for up to 1.0 s at room temperature.Upon doping with Te^(4+),(CytH)_(2)SnCl_(6):x%Te exhibits excitation-dependent emission because of the different optimal excitation wavelengths for the dual emissive centers CytH^(+)(approximately 350 nm)and Te^(4+)(approximately 330 and 390 nm).Moreover,the overlapping between the emission of CytH^(+)and absorption of Te^(4+)induces efficient resonant triplet energy transfer from CytH^(+)to Te^(4+),resulting in a tunable persistence time for the green afterglow produced by CytH^(+).Using excitationdependent emission and tunable afterglow persistence time,the potential of(CytH)_(2)SnCl_(6):x%Te was demonstrated in the application of anti-counterfeiting and information encryption.This study provides an effective strategy for endowing metal halide hybrids with multicolor luminescence.
