[Objectives]To explore a new method for induction of allergic rhinitis in mice,and compare and evaluate it with common modeling methods.[Methods]36 mice were randomly divided into the control group,blank group and exp...[Objectives]To explore a new method for induction of allergic rhinitis in mice,and compare and evaluate it with common modeling methods.[Methods]36 mice were randomly divided into the control group,blank group and experimental group,and there were 12 mice in each group.The mice in the control group were conventionally induced.That is,the mice were first injected intraperitoneally with the mixture composed of OVA 50μg,[Al(OH)3]5 mg and 1ml of normal saline once every other day,and then since the 15 th d,20μL of 5%OVA solution was dropped into each nasal cavity once a day,which lasted for 7 d.The blank group was treated with the same amount of normal saline according to the control group,and received intraperitoneal injection and bilateral nasal drip respectively.In the experimental group,mice were first given intraperitoneal injection of the mixture composed of ovalbumin(OVA)75μg,aluminum hydroxide gel[Al(OH)3]8 mg and normal saline 1.5 mL for basic sensitization.On the 26 th d,20μL of 3%OVA solution was dropped into each nasal cavity once a day,which lasted for 10 d.The number of sneezes,the number of nose scratching,the amount of nasal discharge,and the activity of mice in each group were observed,and the behavior of allergic reaction was scored.Meanwhile,the number of eosinophils in the nasal discharge of mice and the IgE content in serum were measured.[Results]The score of nasal stimulation symptoms,the number of eosinophils and serum IgE level of mice in the control group and the experimental group were higher than those in the blank group(P<0.05),and there was no statistical significance between the two groups in the three indicators(P>0.05).[Conclusions]The modeling method was more suitable for the development of allergic rhinitis patients condition,and reduced the probability of death of mice due to modeling,and simplified the experimental operation.展开更多
In this study, biologically inspired silk fibroin grafted polyacrylonitrile(SF-g-PAN) filtration membrane was prepared using ZnCl_2 aqueous solution as solvent, avoiding the use of organic solvents. Phase inversion oc...In this study, biologically inspired silk fibroin grafted polyacrylonitrile(SF-g-PAN) filtration membrane was prepared using ZnCl_2 aqueous solution as solvent, avoiding the use of organic solvents. Phase inversion occurred when Zn^(2+)and Cl-ions gradually diffused into water, creating a well-connected ion channel network and the SF-g-PAN filtration membrane was obtained. The membranes were observed by SEM and 3D ultra-depth microscope. The hydrophilic property, pore size distribution and dye rejection of the membrane were investigated. Results showed that the membrane has no finger hole formation because ZnCl_2 aqueous solution has a lower curing rate parameter compared with organic solvents. SF-gPAN membrane possessed good anti-fouling properties and pH sensitivity. The pore size distribution of the SF-g-PAN membrane was 0.25–1.04 nm. The rejection of direct yellow 27(Mw = 662.6) and amaranth(Mw = 604.5) was 96.51% and 30.63%, with the flux of 72.32 L m^(-2) h^(-1) and 73.83 L m^(-2) h^(-1) respectively at0.1 MPa. The SF-g-PAN membrane has a wide range of applications prospect in fine separation, dye desalination, waste water treatment and biomedical fields.展开更多
Future variations in precipitation due to the effects of topography and possible trends in land-use change in Central Asia are evaluated by utilizing numerical experiments based on a case study.Considering possible ch...Future variations in precipitation due to the effects of topography and possible trends in land-use change in Central Asia are evaluated by utilizing numerical experiments based on a case study.Considering possible changes in land cover,oasification leads to a 0.23 mm increase in regional-averaged precipitation,accounting for 3.0%of the total.Meanwhile,desertification and urbanization decrease precipitation,by about−5.3%and−4.7%proportionally,mainly through changing the near-surface humidity and thermal environment and related upward transport of heat fluxes in the boundary layer.Relatively,varied terrain height produces a more prominent impact on precipitation(up to−13.1%and−24.9%in the 1/2 and 1/4 original terrain height runs),mainly via varying the wind field and microphysical processes(low-level jet and cloud).Furthermore,the heavier rainfall happens over the mountains,while the more sensitive response of precipitation to varied topography and land use occurs over the plains.As the main microphysical conversion pathways of the rainwater budget,the greater peaks of PSMLT(snow melting into raindrops)and PGMLT(graupel melting into raindrops)present over the mountains but not the plains are responsible for the difference in precipitation between the mountains and plains.However,the more sensitive response of plain rainfall might be related to the rapid transit of rainfall over the plains but prolonged mountainous precipitation lasting together with relatively slowly varying microphysical conversion processes when airflows climb the mountains.The findings of this study have important strategic significance for improving the environment of ecosystems and strengthening the capacity for disaster prevention.展开更多
In order to compare the sensitivity of short-range ensemble forecasts to different land-surface parameters in the South China region,three perturbation experiments related to the land surface model(LSM),initial soil m...In order to compare the sensitivity of short-range ensemble forecasts to different land-surface parameters in the South China region,three perturbation experiments related to the land surface model(LSM),initial soil moisture(ISM),and land–atmosphere coupling coefficient(LCC)were designed,and another control experiment driven by the Global Ensemble Forecast System(GEFS)was also performed.All ensemble members were initiated at 0000 UTC each day,and integrated for 24 h for a total of 40 days from the period 1 April to 10 May 2019 based on the Weather Research and Forecasting model.The results showed that the perturbation experiment of the LSM(LSMPE)had the largest ensemble spread,as well as the lowest ensemble-mean root-mean-square error among the three sets of land-surface perturbed experiments,which indicated that it could represent more uncertainty and less error.The ensemble spread of the perturbation experiment of the ISM(ISMPE)was generally less than that of LSMPE but greater than that of LCCPE(the perturbation experiment of the LCC).In particular,although the perturbation of the LCC could not produce greater spread,it had an effective influence on the intensity of precipitation.However,the ensemble spread of all the land-surface perturbed experiments was smaller than that of GEFSPE(the control experiment).Therefore,in future,land-surface perturbations and atmospheric perturbations should be combined in the design of ensemble forecasting systems to make the model represent more uncertainties.展开更多
[Objectives] To explore the efficacy of different concentrations of Centipeda Herba volatile oil in the treatment of allergic rhinitis (AR) by nasal sniffing and the optimal drug concentration.[Methods] Forty-eight mi...[Objectives] To explore the efficacy of different concentrations of Centipeda Herba volatile oil in the treatment of allergic rhinitis (AR) by nasal sniffing and the optimal drug concentration.[Methods] Forty-eight mice were randomly divided into control group, blank group, alcohol treatment group, low concentration group, medium concentration group and high concentration group, with 8 mice in each group. Except for the blank group, each mouse in the other groups was intraperitoneally injected with 1 mL of a mixture of 50 μgOVA+5 mg [Al(OH)_(3)] +1 mL of normal saline for 14 d. The allergic rhinitis mouse model was successfully established by intranasal instillation of 5% OVA solution on both sides (20 μL per side, once a day) from the 15 th day after stimulation for 7 d. The blank group was treated with the same amount of saline as above. The volatile oil of Centipeda Herba was obtained by steam distillation and petroleum ether extraction, and then was made into 1.25%, 2.5% and 5% volatile oil of Centipeda Herba with 75% alcohol. The control group was stimulated once every other day with reagent 2 after 7 d of stimulation (maintenance) until the end of treatment. The blank group was treated with 5 mL saline by nasal sniffing for 30 d, twice in the morning and evening, 30 min each time. The alcohol treatment group was treated with 5 mL of 75% alcohol, and the low concentration group, the medium concentration group and the high concentration group were treated with 5 mL of 1.25%, 2.5% and 5% Centipeda Herba volatile oil, respectively. The treatment time was the same as that of the blank group, and the treatment process was carried out in their respective closed contamination boxes. Before and after the treatment, the frequency of sneezing, the frequency of scratching nose, the amount of nasal discharge, activity and other general characteristics of the mice were observed, and the allergic behavior score was carried out. Besides, the IgE content in the serum of the mice was determined, and the eosinophils in the nasal discharge were counted.[Results] The scores of mice before and after treatment showed that there was no significant difference in the alcohol treatment group before and after treatment ( P >0.05), and there was significant difference in the low, medium and high concentration groups before and after treatment ( P <0.05), except that there was no significant difference between the control group and the alcohol treatment group ( P >0.05), and there was significant difference among the other groups ( P <0.05). The levels of IgE and the number of eosinophils in peripheral serum of mice in the control group, alcohol treatment group, low concentration group, medium concentration group and high concentration group were higher than those in the blank group ( P <0.05), and there was no significant difference between the two groups ( P >0.05).[Conclusions] Volatile oil of Centipeda Herba can be used to treat allergic rhinitis by nasal sniffing, and 5% volatile oil of Centipeda Herba has the best effect. During the treatment, sneezing and runny nose in mice were reduced. The results showed that nasal sniffing was less irritating to the nasal cavity and not easy to produce discomfort, the utilization rate of drugs was higher than that of traditional therapy, and the volatile oil could be preserved longer than that of traditional Chinese medicine.展开更多
We determined the effects of quartz sand(QS),water treatment plant sludge(WTPS),aluminum-based P-inactivation agent(Al-PIA),and lanthanum-modified bentonite(LMB)thin-layer capping on controlling phosphorus and nitroge...We determined the effects of quartz sand(QS),water treatment plant sludge(WTPS),aluminum-based P-inactivation agent(Al-PIA),and lanthanum-modified bentonite(LMB)thin-layer capping on controlling phosphorus and nitrogen release from the sediment,using a static simulation experiment.The sediment in the experiment was sampled from Yundang Lagoon(Xiamen,Fujian Province,China),which is a eutrophic waterbody.The total phosphorus(TP),ammonium nitrogen(NH4+-N),and total organic carbon(TOC)levels in the overlying water were measured at regular intervals,and the changes of different P forms in WTPS,Al-PIA,and sediment of each system were analyzed before and after the test.The average TP reduction rates of LMB,Al-PIA,WTPS,and QS were 94.82,92.14,86.88,and 10.68%,respectively,when the release strength of sediment TP was 2.26–9.19 mg/(m^(2)·d)and the capping strength of the materials was 2 kg/m^(2).Thin-layer capping of LMB,WTPS,and Al-PIA could effectively control P release from the sediment(P<0.05).However,thin-layer capping of LMB,Al-PIA,and QS did not significantly reduce the release of ammonium N and organic matter(P>0.05).Based on our results,LMB,Al-PIA,and WTPS thin-layer capping promoted the migration and transformation of easily released P in sediment.The P adsorbed by WTPS and Al-PIA mainly occurred in the form of NAIP.展开更多
Spatial separation of oxidation/reduction cocatalyst is an effective means to improve the efficiency of charge separation in photocatalytic reaction systems.Herein,a yolk-shell Pd@NH_(2)-UiO-66@Cu_(2)O heterojunction ...Spatial separation of oxidation/reduction cocatalyst is an effective means to improve the efficiency of charge separation in photocatalytic reaction systems.Herein,a yolk-shell Pd@NH_(2)-UiO-66@Cu_(2)O heterojunction was designed and synthesized by integration of electron collector Pd and hole collector Cu_(2)O inside and outside of a photoactive metal-organic framework(MOF)NH_(2)-UiO-66,respectively.The obtained Pd@NH_(2)-UiO-66@Cu_(2)O heterojunction effectively inhibits the electron and hole recombination through the photo-induced electrons and holes flow inward and outward of the composite,and promotes the reduction and oxidation abilities for the oxidative coupling of benzylamine to imines.Compared with Pd/NH_(2)-UiO-66@Cu_(2)O,Pd@NH_(2)-UiO-66,and Pd/NH_(2)-UiO-66,Pd@NH_(2)-UiO-66@Cu_(2)O exhibits the highest photocatalytic activity.More importantly,Pd@NH_(2)-UiO-66@Cu_(2)O shows a conversion rate of benzylamine up to 99%either by oxidation under aerobic conditions or by strong adsorption of H atom(Hads)under anaerobic conditions.In addition,the catalyst shows good stability and can be recycled at least ten times.This work provides useful guidance on construction of MOFs-based composites with spatially separated photoinduced charge carriers to realize efficient oxidation coupling of benzylamine in both aerobic and anaerobic conditions.展开更多
Objective:The purpose of the current study was to discuss the interrelation among alexithy-mia and negative psychology of nursing personnel and their coping style,so as to provide a theoret-ical basis for better menta...Objective:The purpose of the current study was to discuss the interrelation among alexithy-mia and negative psychology of nursing personnel and their coping style,so as to provide a theoret-ical basis for better mental health education and psychological intervention for nursing personnel.Methods:A questionnaire survey was administered to 503 nursing personnel sampled from a hospital in Henan Province between May and June 2010 by means of survey instruments of the Toronto Alexithymia Scale-20 Items(TAS-20),the Trait Coping Style Questionnaire(TCSQ),and the General Health Questionnaire(GHQ-20).Results:(1)Alexithymia and a negative coping style had a positive correlation with negative psychology(P<0.01),while a positive coping style had a negative correlation with negative psy-chology(P<0.01).(2)The model fitting indices of coping style as intermediate variables between alexithymia and negative psychology were χ^(2)/df=1.459,RMSEA=0.030,CFI=0.995,IFI=0.995,RFI=0.966,TCI=0.989,and NEI=0.985,indicating a good model fitting.Ninety-nine percent of the total variation of negative psychology could be explained by alexithymia and coping style,of which the indirect effect affecting negative psychology by coping style accounted for 94.59%of the total.Conclusion:Alexithymia and coping style were very important factors for improvement of current mental status of the nursing personnel,especially for a change in negative coping style and selection of good coping style.展开更多
基金the National Innovation and Entrepreneurship Project for University Students(202110599012).
文摘[Objectives]To explore a new method for induction of allergic rhinitis in mice,and compare and evaluate it with common modeling methods.[Methods]36 mice were randomly divided into the control group,blank group and experimental group,and there were 12 mice in each group.The mice in the control group were conventionally induced.That is,the mice were first injected intraperitoneally with the mixture composed of OVA 50μg,[Al(OH)3]5 mg and 1ml of normal saline once every other day,and then since the 15 th d,20μL of 5%OVA solution was dropped into each nasal cavity once a day,which lasted for 7 d.The blank group was treated with the same amount of normal saline according to the control group,and received intraperitoneal injection and bilateral nasal drip respectively.In the experimental group,mice were first given intraperitoneal injection of the mixture composed of ovalbumin(OVA)75μg,aluminum hydroxide gel[Al(OH)3]8 mg and normal saline 1.5 mL for basic sensitization.On the 26 th d,20μL of 3%OVA solution was dropped into each nasal cavity once a day,which lasted for 10 d.The number of sneezes,the number of nose scratching,the amount of nasal discharge,and the activity of mice in each group were observed,and the behavior of allergic reaction was scored.Meanwhile,the number of eosinophils in the nasal discharge of mice and the IgE content in serum were measured.[Results]The score of nasal stimulation symptoms,the number of eosinophils and serum IgE level of mice in the control group and the experimental group were higher than those in the blank group(P<0.05),and there was no statistical significance between the two groups in the three indicators(P>0.05).[Conclusions]The modeling method was more suitable for the development of allergic rhinitis patients condition,and reduced the probability of death of mice due to modeling,and simplified the experimental operation.
基金supported by the National Natural Science Foundation of China (Nos. 51678409, 145 708407, 21476172)Tianjin Science Technology Research Funds of China (Nos. 16JCZDJC37500, 15JCZDJC38300)+1 种基金Program for Innovative Research Team in University of Tianjin (No. TD13-5042)Science Foundation for the Youth Teachers of Peking Union Medical College (No. 2014ZLGC0754)
文摘In this study, biologically inspired silk fibroin grafted polyacrylonitrile(SF-g-PAN) filtration membrane was prepared using ZnCl_2 aqueous solution as solvent, avoiding the use of organic solvents. Phase inversion occurred when Zn^(2+)and Cl-ions gradually diffused into water, creating a well-connected ion channel network and the SF-g-PAN filtration membrane was obtained. The membranes were observed by SEM and 3D ultra-depth microscope. The hydrophilic property, pore size distribution and dye rejection of the membrane were investigated. Results showed that the membrane has no finger hole formation because ZnCl_2 aqueous solution has a lower curing rate parameter compared with organic solvents. SF-gPAN membrane possessed good anti-fouling properties and pH sensitivity. The pore size distribution of the SF-g-PAN membrane was 0.25–1.04 nm. The rejection of direct yellow 27(Mw = 662.6) and amaranth(Mw = 604.5) was 96.51% and 30.63%, with the flux of 72.32 L m^(-2) h^(-1) and 73.83 L m^(-2) h^(-1) respectively at0.1 MPa. The SF-g-PAN membrane has a wide range of applications prospect in fine separation, dye desalination, waste water treatment and biomedical fields.
基金The authors were supported by the National Key Research and Development Program on the Monitoring,Early Warning and Prevention of Major Natural Disasters[grant number 2018YFC1507104]the Flexible Talents Introducing Project of Xinjiang(2019).
文摘Future variations in precipitation due to the effects of topography and possible trends in land-use change in Central Asia are evaluated by utilizing numerical experiments based on a case study.Considering possible changes in land cover,oasification leads to a 0.23 mm increase in regional-averaged precipitation,accounting for 3.0%of the total.Meanwhile,desertification and urbanization decrease precipitation,by about−5.3%and−4.7%proportionally,mainly through changing the near-surface humidity and thermal environment and related upward transport of heat fluxes in the boundary layer.Relatively,varied terrain height produces a more prominent impact on precipitation(up to−13.1%and−24.9%in the 1/2 and 1/4 original terrain height runs),mainly via varying the wind field and microphysical processes(low-level jet and cloud).Furthermore,the heavier rainfall happens over the mountains,while the more sensitive response of precipitation to varied topography and land use occurs over the plains.As the main microphysical conversion pathways of the rainwater budget,the greater peaks of PSMLT(snow melting into raindrops)and PGMLT(graupel melting into raindrops)present over the mountains but not the plains are responsible for the difference in precipitation between the mountains and plains.However,the more sensitive response of plain rainfall might be related to the rapid transit of rainfall over the plains but prolonged mountainous precipitation lasting together with relatively slowly varying microphysical conversion processes when airflows climb the mountains.The findings of this study have important strategic significance for improving the environment of ecosystems and strengthening the capacity for disaster prevention.
基金This work was supported by the National Key R&D Program on the Monitoring,Early Warning and Prevention of Major Natural Disasters[grant number 2017YFC1502103]the Key Special Project for the Introducing Talents Team of the Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)[grant number GML2019ZD0601]the National Natural Science Foundation of China[grant numbers 41875136,41305099,and 41801019].
文摘In order to compare the sensitivity of short-range ensemble forecasts to different land-surface parameters in the South China region,three perturbation experiments related to the land surface model(LSM),initial soil moisture(ISM),and land–atmosphere coupling coefficient(LCC)were designed,and another control experiment driven by the Global Ensemble Forecast System(GEFS)was also performed.All ensemble members were initiated at 0000 UTC each day,and integrated for 24 h for a total of 40 days from the period 1 April to 10 May 2019 based on the Weather Research and Forecasting model.The results showed that the perturbation experiment of the LSM(LSMPE)had the largest ensemble spread,as well as the lowest ensemble-mean root-mean-square error among the three sets of land-surface perturbed experiments,which indicated that it could represent more uncertainty and less error.The ensemble spread of the perturbation experiment of the ISM(ISMPE)was generally less than that of LSMPE but greater than that of LCCPE(the perturbation experiment of the LCC).In particular,although the perturbation of the LCC could not produce greater spread,it had an effective influence on the intensity of precipitation.However,the ensemble spread of all the land-surface perturbed experiments was smaller than that of GEFSPE(the control experiment).Therefore,in future,land-surface perturbations and atmospheric perturbations should be combined in the design of ensemble forecasting systems to make the model represent more uncertainties.
基金Supported by 2021 National Undergraduate Innovation and Entrepreneurship Project(202110599012).
文摘[Objectives] To explore the efficacy of different concentrations of Centipeda Herba volatile oil in the treatment of allergic rhinitis (AR) by nasal sniffing and the optimal drug concentration.[Methods] Forty-eight mice were randomly divided into control group, blank group, alcohol treatment group, low concentration group, medium concentration group and high concentration group, with 8 mice in each group. Except for the blank group, each mouse in the other groups was intraperitoneally injected with 1 mL of a mixture of 50 μgOVA+5 mg [Al(OH)_(3)] +1 mL of normal saline for 14 d. The allergic rhinitis mouse model was successfully established by intranasal instillation of 5% OVA solution on both sides (20 μL per side, once a day) from the 15 th day after stimulation for 7 d. The blank group was treated with the same amount of saline as above. The volatile oil of Centipeda Herba was obtained by steam distillation and petroleum ether extraction, and then was made into 1.25%, 2.5% and 5% volatile oil of Centipeda Herba with 75% alcohol. The control group was stimulated once every other day with reagent 2 after 7 d of stimulation (maintenance) until the end of treatment. The blank group was treated with 5 mL saline by nasal sniffing for 30 d, twice in the morning and evening, 30 min each time. The alcohol treatment group was treated with 5 mL of 75% alcohol, and the low concentration group, the medium concentration group and the high concentration group were treated with 5 mL of 1.25%, 2.5% and 5% Centipeda Herba volatile oil, respectively. The treatment time was the same as that of the blank group, and the treatment process was carried out in their respective closed contamination boxes. Before and after the treatment, the frequency of sneezing, the frequency of scratching nose, the amount of nasal discharge, activity and other general characteristics of the mice were observed, and the allergic behavior score was carried out. Besides, the IgE content in the serum of the mice was determined, and the eosinophils in the nasal discharge were counted.[Results] The scores of mice before and after treatment showed that there was no significant difference in the alcohol treatment group before and after treatment ( P >0.05), and there was significant difference in the low, medium and high concentration groups before and after treatment ( P <0.05), except that there was no significant difference between the control group and the alcohol treatment group ( P >0.05), and there was significant difference among the other groups ( P <0.05). The levels of IgE and the number of eosinophils in peripheral serum of mice in the control group, alcohol treatment group, low concentration group, medium concentration group and high concentration group were higher than those in the blank group ( P <0.05), and there was no significant difference between the two groups ( P >0.05).[Conclusions] Volatile oil of Centipeda Herba can be used to treat allergic rhinitis by nasal sniffing, and 5% volatile oil of Centipeda Herba has the best effect. During the treatment, sneezing and runny nose in mice were reduced. The results showed that nasal sniffing was less irritating to the nasal cavity and not easy to produce discomfort, the utilization rate of drugs was higher than that of traditional therapy, and the volatile oil could be preserved longer than that of traditional Chinese medicine.
基金supported by the National Natural Science Fund of China(Grant No.51878300)the Natural Science Foundation of Fujian Province of China(Grant No.2019J01052)Project of production,study and research of colleges and universities of Xiamen City(Grant No.3502Z20203044).
文摘We determined the effects of quartz sand(QS),water treatment plant sludge(WTPS),aluminum-based P-inactivation agent(Al-PIA),and lanthanum-modified bentonite(LMB)thin-layer capping on controlling phosphorus and nitrogen release from the sediment,using a static simulation experiment.The sediment in the experiment was sampled from Yundang Lagoon(Xiamen,Fujian Province,China),which is a eutrophic waterbody.The total phosphorus(TP),ammonium nitrogen(NH4+-N),and total organic carbon(TOC)levels in the overlying water were measured at regular intervals,and the changes of different P forms in WTPS,Al-PIA,and sediment of each system were analyzed before and after the test.The average TP reduction rates of LMB,Al-PIA,WTPS,and QS were 94.82,92.14,86.88,and 10.68%,respectively,when the release strength of sediment TP was 2.26–9.19 mg/(m^(2)·d)and the capping strength of the materials was 2 kg/m^(2).Thin-layer capping of LMB,WTPS,and Al-PIA could effectively control P release from the sediment(P<0.05).However,thin-layer capping of LMB,Al-PIA,and QS did not significantly reduce the release of ammonium N and organic matter(P>0.05).Based on our results,LMB,Al-PIA,and WTPS thin-layer capping promoted the migration and transformation of easily released P in sediment.The P adsorbed by WTPS and Al-PIA mainly occurred in the form of NAIP.
基金supported by the National Natural Science Foundation of China(Nos.21771163 and 22171247)Zhongyuan thousand talents project.
文摘Spatial separation of oxidation/reduction cocatalyst is an effective means to improve the efficiency of charge separation in photocatalytic reaction systems.Herein,a yolk-shell Pd@NH_(2)-UiO-66@Cu_(2)O heterojunction was designed and synthesized by integration of electron collector Pd and hole collector Cu_(2)O inside and outside of a photoactive metal-organic framework(MOF)NH_(2)-UiO-66,respectively.The obtained Pd@NH_(2)-UiO-66@Cu_(2)O heterojunction effectively inhibits the electron and hole recombination through the photo-induced electrons and holes flow inward and outward of the composite,and promotes the reduction and oxidation abilities for the oxidative coupling of benzylamine to imines.Compared with Pd/NH_(2)-UiO-66@Cu_(2)O,Pd@NH_(2)-UiO-66,and Pd/NH_(2)-UiO-66,Pd@NH_(2)-UiO-66@Cu_(2)O exhibits the highest photocatalytic activity.More importantly,Pd@NH_(2)-UiO-66@Cu_(2)O shows a conversion rate of benzylamine up to 99%either by oxidation under aerobic conditions or by strong adsorption of H atom(Hads)under anaerobic conditions.In addition,the catalyst shows good stability and can be recycled at least ten times.This work provides useful guidance on construction of MOFs-based composites with spatially separated photoinduced charge carriers to realize efficient oxidation coupling of benzylamine in both aerobic and anaerobic conditions.
基金Natural Science Fund Project of the Education Department of Henan Province[Relationship model between alexithymia and psychosomatic health of medical workers(2011A320010)].
文摘Objective:The purpose of the current study was to discuss the interrelation among alexithy-mia and negative psychology of nursing personnel and their coping style,so as to provide a theoret-ical basis for better mental health education and psychological intervention for nursing personnel.Methods:A questionnaire survey was administered to 503 nursing personnel sampled from a hospital in Henan Province between May and June 2010 by means of survey instruments of the Toronto Alexithymia Scale-20 Items(TAS-20),the Trait Coping Style Questionnaire(TCSQ),and the General Health Questionnaire(GHQ-20).Results:(1)Alexithymia and a negative coping style had a positive correlation with negative psychology(P<0.01),while a positive coping style had a negative correlation with negative psy-chology(P<0.01).(2)The model fitting indices of coping style as intermediate variables between alexithymia and negative psychology were χ^(2)/df=1.459,RMSEA=0.030,CFI=0.995,IFI=0.995,RFI=0.966,TCI=0.989,and NEI=0.985,indicating a good model fitting.Ninety-nine percent of the total variation of negative psychology could be explained by alexithymia and coping style,of which the indirect effect affecting negative psychology by coping style accounted for 94.59%of the total.Conclusion:Alexithymia and coping style were very important factors for improvement of current mental status of the nursing personnel,especially for a change in negative coping style and selection of good coping style.
