期刊文献+
共找到17篇文章
< 1 >
每页显示 20 50 100
Interaction Between Ustilaginoidea virens and Rice and Its Sustainable Control
1
作者 ZHANG Fengmin CAO Zhenzhen +3 位作者 ZHENG Xin HE Yuntao CHEN Mingxue LIN Xiaoyan 《Rice science》 SCIE CSCD 2024年第3期269-284,共16页
Ustilaginoidea virens is a common rice pathogen that can easily lead to a decline in rice quality and the production of toxins pose potential risks to human health.In this review,we present a comprehensive literature ... Ustilaginoidea virens is a common rice pathogen that can easily lead to a decline in rice quality and the production of toxins pose potential risks to human health.In this review,we present a comprehensive literature review of research since the discovery of rice false smut.We provide a comprehensive and,at times,critical overview of the main results and findings from related research,and propose future research directions.Firstly,we delve into the interaction between U.virens and rice,including the regulation of transcription factors,the process of U.virens infecting rice panicles,and the plant immune response caused by rice infection.Following that,we discuss the identification and characterization of mycotoxins produced by the pathogenic fungus,as well as strategies for disease management.We emphasize the importance of comprehensive agricultural prevention and control methods for the sustainable management of U.virens.This knowledge will update our understanding of the interaction between U.virens and rice plants,offering a valuable perspective for those interested in U.virens. 展开更多
关键词 rice false smut flower-specific infection MYCOTOXIN food safety plant disease
下载PDF
Effects of temperature, particle size, and air humidity on sensibility of typical high-energetic explosives
2
作者 WU Sanzhen FANG Mingkun +3 位作者 WU Xingliang GUO Guangfei WANG Junhong XU Sen 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2024年第3期408-416,共9页
The production and utilization of high-energetic explosives often pose a range of safety hazards,with sensitivity being a key factor in evaluating these risks.To investigate how temperature,particle size,and air humid... The production and utilization of high-energetic explosives often pose a range of safety hazards,with sensitivity being a key factor in evaluating these risks.To investigate how temperature,particle size,and air humidity affect the responsiveness of commonly used high-energetic explosives,a series of BAM(Bundesanstalt für Materialforschung und-prüfung)impact and friction sensitivity tests were carried out to determine the critical impact energy and critical load pressure of four representative high-energetic explosives(RDX,HMX,PETN and CL-20)under different temperatures,particle sizes,and air humidity conditions.The experimental findings facilitated an examination of temperature and particle size affecting the sensitivity of high-energetic explosives,along with an assessment of the influence of air humidity on sensitivity testing.The results clearly indicate that high-energetic explosives display a substantial decline in critical reaction energy when subjected to micrometre-sized particles and an air humidity level of 45%at a temperature of 90℃.Furthermore,it was noted that the critical reaction energy of high-energetic explosives diminishes with an increase in temperature within 25℃−90℃.In the same vein,as the particle sizes of high-energetic explosives increase,so does the critical reaction energy for micrometre-sized particles.High air humidity significantly affects the sensitivity testing of high-energetic explosives,emphasizing the importance of refraining from conducting sensitivity tests in such conditions. 展开更多
关键词 high-energetic explosives TEMPERATURE particle size air humidity critical reaction energy
下载PDF
Animal Safety Test of Bacillus thuringiensis BT Protein
3
作者 Weimeng NING Dingkuo LIU +6 位作者 Fang LIU Yuan LI Xiaowei YANG Zhenguo GUAN Guijun YANG Bo ZHANG Pengcheng HU 《Asian Agricultural Research》 2024年第2期31-32,35,共3页
[Objectives]To determine the biological safety of BT protein from Bacillus thuringiensis(Bt)fermentation broth to mammals at high doses.[Methods]Healthy mice were randomly divided into 4 groups with 10 mice in each gr... [Objectives]To determine the biological safety of BT protein from Bacillus thuringiensis(Bt)fermentation broth to mammals at high doses.[Methods]Healthy mice were randomly divided into 4 groups with 10 mice in each group.The experimental groups were fed with Bt fermentation supernatant at 0.2,0.6 and 1.0 mL/kg,respectively,once a day for 7 consecutive days.The blank control group was fed normally without intragastric administration.[Results]There was no significant difference in blood routine and blood biochemical analysis between the experimental group and the control group.After intragastric administration,the mice were dissected,and no obvious pathological changes were found;the heart,liver,spleen,lung and kidney were taken to make tissue sections,and no pathological changes were found by microscopic observation.[Conclusions]Mice can tolerate high doses of BT protein from B.thuringiensis fermentation broth. 展开更多
关键词 Bacillus thuringiensis(Bt) BT protein Biological safety
下载PDF
Study on the Effects of Probiotics on the Growth of Cyprinus carpiod and Water Quality 被引量:1
4
作者 Wanqing GUO Lidan BAI +3 位作者 Hai WANG Xiaowei LI Wei SHI Shuo SUN 《Agricultural Science & Technology》 CAS 2015年第6期1183-1186,1266,共5页
[Objective] The aim was to discuss the effects of probiotics on the growth of Cyprinus carpiod and water quality. [Method] Taking C. carpiod as the research object, probiotics were supplemented in the fodder and water... [Objective] The aim was to discuss the effects of probiotics on the growth of Cyprinus carpiod and water quality. [Method] Taking C. carpiod as the research object, probiotics were supplemented in the fodder and water to study their effects on the growth of C. carpiod and water quality. [Result] Probiotics had promoting effects on the growth of C. carpiod and its optimum dosage was 6%. pH, ammonia nitrogen content and nitrite content in water body in experimental groups were all lower than those in control group. [Conclusion] Compound probiotics had a broad application foreground in the aquatic breeding industry. 展开更多
关键词 Cyprinus carpiod PROBIOTICS GROWTH Ammonia nitrogen NITRITE
下载PDF
Comprehensive Characterization Model of Integrated Cotton Fiber Quality Index 被引量:1
5
作者 刘贵 杨瑜榕 +2 位作者 王明葵 YANG Shouren 于伟东 《Journal of Donghua University(English Edition)》 EI CAS 2011年第4期379-383,共5页
An integrated cotton fiber quality index (ICFQI) model with cotton fiber qualities which can directly express cotton fiber integrated quality and spinning yarn quality was studied. The fiber length, strength, Micron... An integrated cotton fiber quality index (ICFQI) model with cotton fiber qualities which can directly express cotton fiber integrated quality and spinning yarn quality was studied. The fiber length, strength, Micronalre (fiber fineness and fiber maturity), uniformity of fiber length, and short fiber content are the pivotal indexes expressing ICFQI. All of the results above are the basic knowledge to build up the models of ICFQI. According to spinning consistency index (SCI), spinning strength and spinning yarn integrated quality, ICFQI was the best choice. As the methods of ICFQI had quite a lot of advantages like explicit mechanism, few independent variables. The integrated fiber quality index had a significant positive correlation with yarn strength and spinning consistency, significant negative correlation with yarn evenness and yarn thin places. In additional, the model of the relationship between ICFQI and SCI was established as: SCI=0. 235 6·ICFQI +56.153. It was concluded that ICFQI value was the shared reference index for the testing of fiber inspection agency and the selection and distribution of raw cotton bales by textile mills. 展开更多
关键词 fiber quality integrated cotton fiber quality index(ICFQ1) comprehensive characterization model
下载PDF
Effect of vibration frequency on microstructure and performance of high chromium cast iron prepared by lost foam casting 被引量:5
6
作者 Wen-qi Zou Zhi-guo Zhang +1 位作者 Hao Yang Wei Li 《China Foundry》 SCIE 2016年第4期248-255,共8页
In the present research, high chromium cast irons(HCCIs) were prepared using the lost foam casting(LFC) process. To improve the wear resistance of the high chromium cast irons(HCCIs), mechanical vibration was employed... In the present research, high chromium cast irons(HCCIs) were prepared using the lost foam casting(LFC) process. To improve the wear resistance of the high chromium cast irons(HCCIs), mechanical vibration was employed during the solidification of the HCCIs. The effects of vibration frequency on the microstructure and performance of the HCCIs under as-cast, as-quenched and as-tempered conditions were investigated. The results indicated that the microstructures of the LFC-produced HCCIs were refined due to the introduction of mechanical vibration, and the hardness was improved compared to that of the alloy without vibration. However, only a slight improvement in hardness was found in spite of the increase of vibration frequency. In contrast, the impact toughness of the as-tempered HCCIs increased with an increase in the vibration frequency. In addition, the wear resistance of the HCCIs was improved as a result of the introduction of vibration and increased with an increase in the vibration frequency. 展开更多
关键词 high CHROMIUM CAST iron vibration frequency LOST foam CASTING MICROSTRUCTURE WEAR resistance
下载PDF
Generalized distributed four-domain digital twin system for intelligent manufacturing 被引量:4
7
作者 LIU Zhi-feng ZHANG Yue-ze +3 位作者 YANG Cong-bin HUANG Zu-guang ZHANG Cai-xia XIE Fu-gui 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第1期209-225,共17页
Discrete manufacturing workshops are confronted with problems of processing diverse products and strict real time requirements for data service calculation and manufacturing equipment,which makes it difficult to provi... Discrete manufacturing workshops are confronted with problems of processing diverse products and strict real time requirements for data service calculation and manufacturing equipment,which makes it difficult to provide real time feedback and compensation.In this study,a high-availability,high-performance,and high-concurrency digital twin reference model was constructed to satisfy a large number of manufacturing requirements.A multiterminal real-time interaction model and information aging classification rules for virtual and physical models were established.Moreover,a multiterminal virtual interaction model was proposed,and a generalized distributed computing service digital twinning system was developed.This digital twin system was considered a machine tool box processing line as an actual case.Consequently,a full closed-loop manufacturing process digital twin platform for physical request service,real-time response,and quality information feedback from iterations,which provides case guidance for subsequent factory digital twin systems,was realized.The proposed system can satisfy the requirements of multidevice big data computing services in modern manufacturing plants,as well as multiplatform,low-latency,and high-fidelity information visualization requirements for managers.Thus,this system is expected to play an important role in information factories. 展开更多
关键词 digital twin distributed system multiterminal interaction container choreography system
下载PDF
Soft measurement model of ring's dimensions for vertical hot ring rolling process using neural networks optimized by genetic algorithm 被引量:2
8
作者 汪小凯 华林 +3 位作者 汪晓旋 梅雪松 朱乾浩 戴玉同 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第1期17-29,共13页
Vertical hot ring rolling(VHRR) process has the characteristics of nonlinearity,time-variation and being susceptible to disturbance.Furthermore,the ring's growth is quite fast within a short time,and the rolled ri... Vertical hot ring rolling(VHRR) process has the characteristics of nonlinearity,time-variation and being susceptible to disturbance.Furthermore,the ring's growth is quite fast within a short time,and the rolled ring's position is asymmetrical.All of these cause that the ring's dimensions cannot be measured directly.Through analyzing the relationships among the dimensions of ring blanks,the positions of rolls and the ring's inner and outer diameter,the soft measurement model of ring's dimensions is established based on the radial basis function neural network(RBFNN).A mass of data samples are obtained from VHRR finite element(FE) simulations to train and test the soft measurement NN model,and the model's structure parameters are deduced and optimized by genetic algorithm(GA).Finally,the soft measurement system of ring's dimensions is established and validated by the VHRR experiments.The ring's dimensions were measured artificially and calculated by the soft measurement NN model.The results show that the calculation values of GA-RBFNN model are close to the artificial measurement data.In addition,the calculation accuracy of GA-RBFNN model is higher than that of RBFNN model.The research results suggest that the soft measurement NN model has high precision and flexibility.The research can provide practical methods and theoretical guidance for the accurate measurement of VHRR process. 展开更多
关键词 vertical hot ring rolling dimension precision soft measurement model artificial neural network genetic algorithm
下载PDF
Absorption of Iodide Ions in Aqueous Solution by ZIF-67 and ZIF-8 被引量:1
9
作者 Zhen HAN 《Meteorological and Environmental Research》 CAS 2021年第4期68-72,共5页
Two zeolite-like imidazate metal-framework materials ZIF-67 and ZIF-8 were synthesized by using Co(NO_(3))2,Zn(NO_(3))_(2),2-methyl imidazole and methanol as raw materials,and these two materials were used to adsorb i... Two zeolite-like imidazate metal-framework materials ZIF-67 and ZIF-8 were synthesized by using Co(NO_(3))2,Zn(NO_(3))_(2),2-methyl imidazole and methanol as raw materials,and these two materials were used to adsorb iodine ions in water.The impact of pH,contact time and temperature etc.on the adsorption capability of iodide ions in aqueous solutions by the two ZIF materials was investigated.The results show that the optimal adsorption pH was 7,and the optimal adsorption time was 18 h.The adsorption of iodide ions by ZIF-67 was consistent with the Langmuir adsorption isotherm,while the absorption of iodide ions by ZIF-8 was in better consistency with the Freundlich adsorption isotherm.The maximum adsorption capacity of iodide ions by ZIF-67 and ZIF-8 was 141.81 and 474.02 mg/g respectively.The adsorption of iodide ions by the two materials was more in line with the quasi-first-order kinetic model,and the adsorption was monolayer adsorption. 展开更多
关键词 ADSORPTION Iodide ions MOFS ZIF
下载PDF
PAC Addition for MBR Start up in Micro-polluted Water Treatment
10
作者 Quan Zhang Feiyun Sun +2 位作者 Wenyi Dong Rubing Han Lei Liu 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2015年第3期40-47,共8页
In order to improve membrane reactor( MBR) performance for micro-polluted surface water treatment in start-up phase,removals of nitrogen and organic matters especially synthetic organic matters by MBR and a simultaneo... In order to improve membrane reactor( MBR) performance for micro-polluted surface water treatment in start-up phase,removals of nitrogen and organic matters especially synthetic organic matters by MBR and a simultaneous application of powdered activated carbon( PAC) with MBR( PAC-MBR) using flat sheet membrane are investigated. The results confirm that MBR treatment can be effective for the removal of organic matters including trace organics. The added PAC can improve contaminant removal efficiency especially in the beginning of operation when MBR cannot effectively remove contaminants and effluent satisfying quality standards is obtained. Moreover,the removal efficiency of target trace synthetic organics is investigated and the removal mechanism is discussed. Biodegradation by microorganism,rejection by filtration of membrane with biofilm and adsorption all contribute to the removal performance. Furthermore,volatile organic compounds can be removed by aeration. The filtration process is confirmed important for natural organic matters( NOM)removal in both MBR and PAC-MBR systems. Combining with PAC,the MBR can remove all fractions of NOM while the single MBR can hardly reduce fulvic or humic acid in water even during the steady operation. 展开更多
关键词 MBR powdered activated carbon TRICHLOROETHYLENE NITROBENZENE TRICHLOROPHENOL
下载PDF
Properties and Structure of Multi-walled Carbon Nanotubes/Cellulose Composites Fibers Using Ionic Liquid as Solvent
11
作者 蔡涛 杨瑜榕 +1 位作者 王明葵 张慧慧 《Journal of Donghua University(English Edition)》 EI CAS 2011年第6期591-594,共4页
To take advantage of cellulose material and prepare a kind of high performance fiber,multi-walled carbon nanotubes(MWNTs) were used as fillers to produce MWNTs/cellulose composite fibers using ionic liquid as solvent.... To take advantage of cellulose material and prepare a kind of high performance fiber,multi-walled carbon nanotubes(MWNTs) were used as fillers to produce MWNTs/cellulose composite fibers using ionic liquid as solvent.The thermal properties,mechanical properties,and structure of the composite fibers were investigated.The wide angle X-ray diffraction(WAXD) measurements show that MWNTs/cellulose composite fibers have cellulose Ⅱ crystal structure.The results obtained from thermal gravimetric analysis(TGA) indicate that the addition of low nanotubes amounts leads to an increase in the degrade temperature.The tensile mechanical properties show that initial modulus and tensile strength considerably increase in the presence of nanotubes with a maximum for 66.7% and 22.7%. 展开更多
关键词 carbon nanotubes ionic liquid composite fiber mechanical properties
下载PDF
Research on hydraulic-powered roof supports test problems
12
作者 SUN Hong-bo JIANG Jin-qiu MA Qiang 《Journal of Coal Science & Engineering(China)》 2011年第2期201-206,共6页
The load-bearing characters of hydraulic-powered roof support with dual telescopic legs were analyzed. With a specific type hydraulic-powered roof support with dual telescopic legs for research object, the inside load... The load-bearing characters of hydraulic-powered roof support with dual telescopic legs were analyzed. With a specific type hydraulic-powered roof support with dual telescopic legs for research object, the inside load test problems in factories was analyzed, and the correct test methods were given, which can enhance the test efficiency and make the factories away from the error design of hydraulic-powered roof supports and legs. 展开更多
关键词 dual telescopic legs hydraulic-powered roof support LOAD
下载PDF
Effect of Delay Released Welan Gum on the Performance of Cement Mortar
13
作者 赵青林 LIU Ciqi +1 位作者 QU Chengjie ZENG Luping 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第5期1008-1017,共10页
Welan gum is widely applied in environmental admixtures due to its good thickening and rheological properties. With its powerful charge density in the molecular structure, the competitive adsorption between welan gum ... Welan gum is widely applied in environmental admixtures due to its good thickening and rheological properties. With its powerful charge density in the molecular structure, the competitive adsorption between welan gum and other admixtures happened remarkably during the addition process. So controlling the releasing rate of welan gum will be able to improve the competitive adsorption, while having no disadvantages to its thickening and workability at the same time. The investigation of influences of the delay released welan gum(DRWG) on the fluidity and strength of cement mortar, bleeding rate and rheological properties of cement paste, adsorption amount and zeta potential of clinker single mineralogical phases, shows that there will be a better mortar workability and certain improvement in mortar strength with DRWG. For mortar with DRWG, the standing bleeding rate is 0, and there is less thixotropic, less adsorption, and a lower zeta potential value on the surface of clinker mineralogical phases. 展开更多
关键词 delay released welan gum standing bleeding rate rheological properties adsorption zeta potential
下载PDF
Growing Development and Physiological Characteristics of Seeds Harvested Different Days after Pollination and Their 7-day Seedlings of Two Yellow-Seeded Cultivars of Brassica napus L.
14
作者 GAO You-li ZHANG Long-yan +5 位作者 KANG Lei CHEN Xing-ke ZOU Ke WANG Xiang-juan ZHANG Wei TANG Shan-shan 《Agricultural Science & Technology》 CAS 2024年第3期6-13,共8页
This study aimed to understand the growing development and physiological characteristics of seeds harvested different days after pollination and the seedlings emerged from the seeds of yellow-seeded Brassica napus L..... This study aimed to understand the growing development and physiological characteristics of seeds harvested different days after pollination and the seedlings emerged from the seeds of yellow-seeded Brassica napus L..Two yellow-seeded cultivars‘Hongyuan 558’and‘Qinyou 806’were selected in this study,and 50 seeds were collected 30,35,and 40 d after pollination,respectively.The seeds were weighed and placed on filter paper for hydroponic experiments.The seed germination rate was determined 3-5 d later.The physiological indicators including superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT)activities and malondialdehyde(MDA)content were measured for the seeds harvested different days after pollination and the 7-day-seedlings emerged from the seeds.The results showed that the seed dry weights and germination rates of both‘Qinyou 806’and‘Hongyuan 558’increased as the days after pollination increased,especially 30-35 d after pollination.The germination rate and dry and fresh weights of the seeds showed no significant differences between the two cultivars,and almost all the seeds germinated 40 d after pollination.As the days after pollination increased,the SOD activities in the seeds of both cultivars first increased and then decreased,reaching their peaks 35 d after pollination,which may be related to encountering adverse stress.The POD activity in the seeds of‘Qinyou 806’kept declining,and that of‘Hongyuan 558’first increased and then decreased,which may be related to the antioxidant mechanism and adaptive regulation.The CAT activities in the seeds of both cultivars first decreased and then increased.The MDA content in the seeds of‘Qinyou 806’first decreased and then increased,while that of‘Hongyuan 558’kept reducing and was the highest in the seeds 30 d after pollination,which indicated‘Hongyuan 558’was mildly affected by the environment and had strong resistance.The activities of SOD and POD in the seedlings of two cultivars that were emerged from the seeds 35-40 d after pollination became weakened,which may be related to their exposure to stress.The CAT activity in the seedlings of‘Hongyuan 558’was generally higher than that of‘Qinyou 806’,indicating that‘Hongyuan 558’had stronger stress resistance.The MDA content in the seedlings emerged from the seeds 35-40 d after pollination showed a decreasing trend,indicating that the seedlings emerged from the seeds harvested at this stage had mild cell membrane damage and enhanced stress resistance.In conclusion,‘Hongyuan 558’had strong environmental adaptability and stress resistance. 展开更多
关键词 Yellow-seeded Brassica napus Superoxide dismutase Peroxidase Catalase Malondialdehyde
下载PDF
Nucleocapsid protein from porcine epidemic diarrhea virus isolates can antagonize interferon-λ production by blocking the nuclear factor-κB nuclear translocation 被引量:10
15
作者 Ying SHAN Zi-qi LIU +7 位作者 Guo-wei LI Cong CHEN Hao LUO Ya-jie LIU Xun-hui ZHUO Xing-fen SHI Wei-huan FANG Xiao-liang LI 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2018年第7期570-580,共11页
Porcine epidemic diarrhea virus(PEDV) is a highly infectious pathogen that can cause severe diseases in pigs and result in enormous economic losses in the worldwide swine industry. Previous studies revealed that PED... Porcine epidemic diarrhea virus(PEDV) is a highly infectious pathogen that can cause severe diseases in pigs and result in enormous economic losses in the worldwide swine industry. Previous studies revealed that PEDV exhibits an obvious capacity for modulating interferon(IFN) signaling or expression. The newly discovered type III IFN, which plays a crucial role in antiviral immunity, has strong antiviral activity against PEDV proliferation in IPEC-J2 cells. In this study, we aimed to investigate the effect of PEDV nucleocapsid(N) protein on type III IFN-λ. We found that the N proteins of ten PEDV strains isolated between 2013 and 2017 from different local farms shared high nucleotide identities, while the N protein of the CV777 vaccine strain formed a monophyletic branch in the phylogenetic tree. The N protein of the epidemic strain could antagonize type III IFN, but not type I or type II IFN expression induced by polyinosinic-polycytidylic acid(poly(I:C)) in IPEC-J2 cells. Subsequently, we demonstrated that the inhibition of poly(I:C)-induced IFN-λ3 production by PEDV N protein was dependent on the blocking of nuclear factor-κB(NF-κB) nuclear translocation. These findings might help increase understanding of the pathogenesis of PEDV and its mechanisms for evading the host immune response. 展开更多
关键词 Porcine epidemic diarrhea virus Nucleocapsid protein Interferon-λ(IFN-λ) Nuclear factor-κB(NF-κB) Intestinal epithelial cells
原文传递
Dissipation pattern of azoxystrobin and difenoconazole in red dragon fruit(Hylocereus polyrhizus)cultivated in Indonesian highland(West Java)and coastal area(D.I.Jogyakarta)and its implication for dietary risk assessment 被引量:2
16
作者 Sri Noegrohati Sri Sulasmi +1 位作者 Elan Hernadi Syanti Asviastuti 《Food Quality and Safety》 SCIE CSCD 2019年第2期99-106,共8页
Background:Cultivation of red dragon fruit(Hylocereus polyrhizus)in Indonesian orchards is hampered by anthracnose and stem canker.A mixture of azoxystrobin 200 g/L+difenoconazole 125 g/L is recommended in supporting ... Background:Cultivation of red dragon fruit(Hylocereus polyrhizus)in Indonesian orchards is hampered by anthracnose and stem canker.A mixture of azoxystrobin 200 g/L+difenoconazole 125 g/L is recommended in supporting the obligated integrated pest management.For the consumer safety,dietary intake of the residues from fresh edible part should be assessed;therefore,information on correct dissipation pattern of the applied pesticide is required.Materials and Methods:Field residue trials in Indonesian highland(West Java)and coastal area(Special Region of Yogyakarta)were done at recommended dose was 0.151 kg ai/ha azoxystrobin and 0.094 kg ai/ha difenoconazole,three times at 10 days interval.Whole fruit samples were collected at 70%-100%ripeness at−1,0,1,3,7,10,and 14 days after last application,processed and determined its residue as soon as possible.Result and Discussion:Photoisomerization of azoxystrobin was observed at Day 0,especially in coastal area;however,it has been dissipated to below lowest validated level in the following day.At Day 0,3%-5%of the deposited azoxystrobin and difenoconazole penetrate into the flesh;however,most residues(95%-97%)were retained in peel,and dissipated in prolonged day.The dissipation pattern was non-linear.The dissipation data were better fit with bi-exponential double-first-order in parallel than single first-order kinetics model.The DT50 of both azoxystrobin and difenoconazole was 3 days.At harvest time,seventh day,only azoxystrobin residue was detected in flesh at 0.006 mg/kg;therefore,the long-term dietary risk was 0 per cent acceptable daily intake.Conclusion:Fresh red dragon fruit is safe to consume. 展开更多
关键词 AZOXYSTROBIN DIFENOCONAZOLE red dragon fruit DISSIPATION dietary risk
原文传递
Supramolecular Self-assembly Behaviors of Asymmetric Diblock Copolymer Blends with Hydrogen Bonding Interactions between Shorter Blocks Modelled by Yukawa Potentials 被引量:1
17
作者 Xu Zhang Jialiang Chen +1 位作者 Lin Xu Tianxi Liu 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2021年第11期1502-1509,共8页
We employed the extended self-consistent field theory to investigate the supramolecular self-assembly behaviors of asymmetric diblock copolymer blends(AB/B’C)with hydrogen bonding interactions between shorter B and B... We employed the extended self-consistent field theory to investigate the supramolecular self-assembly behaviors of asymmetric diblock copolymer blends(AB/B’C)with hydrogen bonding interactions between shorter B and B’blocks.The hydrogen bonding interactions are described by Yukawa potentials,where the hydrogen bonding donors and acceptors were modelled as two blocks smeared with opposite screened charges.The hierarchical microstructures with parallelly packed lamellae-in-lamellae(Lam)and 4.8.8 Archimedean tilting pattern(4.8.8)were observed at lower and higher hydrogen bonding density(θ),respectively.The hierarchy of Lam and 4.8.8 were demonstrated by the one-and two-dimensional density profiles and the underlying order of the large-length-scale and small-length-scale microstructures were also clarified.It was found that the 4.8.8 is favorable to the stronger hydrogen bonding density or interactions.Asθincreases,the microphase transition from Lam to 4.8.8 occurs atθ=0.34,which is mainly attributed to the optimization of the electrostatic energy and conformational entropy with sacrificing the interfacial energy.This work can provide a new strategy to understand the supramolecular self-assembly as well as the mechanism behind the formation of complex hierarchical microstructures. 展开更多
关键词 Supramolecular self-assembly Hydrogen bond Block copolymer Self-consistent field theory Hierarchical microstructure
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部