摘要：
Through gravity/gauge duality, the string breaking and running coupling constant of heavy quarkantiquark pair are investigated in the rotating background. For the meson decay mode QQ -> Qq + Qq, we discuss the string breaking and running coupling in the parallel and transverse case. It is found that the parallel case has a more significant on string breaking and running coupling constant than the transverse case in the confined phase. The string-breaking distance and the maximum value of running coupling will decrease with the increase of angular velocity in the parallel case. Besides, we also investigate the running coupling and screening distance at finite angular velocity in the deconfined phase. It is found that the maximum values of the running coupling and screening distance are decreasing functions of angular velocity. The parallel case has a more significant influence on the running coupling and screening distance than the transverse case in the deconfined phase. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
摘要：
As a common antioxidant and nutritional fortifier in food chemistry, rutin has positive therapeutic effects against novel coronaviruses. Here, Ce-doped poly(3,4-ethylenedioxythiophene) (Ce-PEDOT) nanocomposites derived through cerium-based metal-organic framework (Ce-MOF) as a sacrificial template have been synthesized and successfully applied to electrochemical sensors. Due to the outstanding electrical conductivity of PEDOT and the high catalytic activity of Ce, the nanocomposites were used for the detection of rutin. The Ce-PEDOT/GCE sensor detects rutin over a linear range of 0.02-9μM with the limit of detection of 14.7nM(S/N=3). Satisfactory results were obtained in the determination of rutin in natural food samples (buckwheat tea and orange). Moreover, the redox mechanism and electrochemical reaction sites of rutin were investigated by the CV curves of scan rate and density functional theory. This work is the first to demonstrate the combined PEDOT and Ce-MOF-derived materials as an electrochemical sensor to detect rutin, thus opening a new window for the application of the material in detection.
期刊：
Journal of Manufacturing Processes,2023年101:795-806 ISSN：1526-6125
通讯作者：
Cui, JJ
作者机构：
[Li, Guangyao; Cui, JJ; Zhu, Jiapei; Cui, Junjia; Chen, Chang; Jiang, Hao; Liu, Quanxiaoxiao] Hunan Univ, State Key Lab Adv Design & Mfg Technol Vehicle, Changsha 410082, Peoples R China.;[Chen, Chang] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413000, Peoples R China.;[Li, Guangyao] Beijing Inst Technol, Shenzhen Automot Res Inst, Shenzhen Res Inst, Natl Engn Lab Elect Vehicles, Shenzhen 518118, Peoples R China.
通讯机构：
[Cui, JJ ] H;Hunan Univ, State Key Lab Adv Design & Mfg Technol Vehicle, Changsha 410082, Peoples R China.
关键词：
Magnetic pulse spot welding;Aluminium alloy sheet;Mechanical property;Micro-morphology
摘要：
Magnetic pulse spot welding (MPSW) is a safe, efficient and environmentally friendly process, which is very suitable for joining aluminium alloys. AA5052 aluminium alloy sheets were joined by MPSW. Specifically, the bump on the flyer plate was driven to impact the parent plate at high velocity to achieve metallurgical bonding. The formation process, mechanical properties and micro-morphology of the joint were studied. The results showed that the bump of the flyer plate impacted the parent plate at high velocity caused by Lorentz force to form welding seam. The shape of the welding seam was two incompletely continuous symmetrical elliptical arcs due to the different welding velocities and welding angles in each zone. The strength of the joint was higher than that of the base metal at appropriate process parameters. Specifically, the relatively better process parameters were welding gap of 1.4 mm, welding diameter of 16 mm and discharge energy of 36 kJ. The maximum loads of tensile shear and cross-tension were 4887 N, 1744 N. There were a large amount of dimples at the fracture of welding seam, and the toughness of joint was good.
作者机构：
[Ge, Yaping; Tang, Huang; Yang, Yiming; Li, Hai] Hunan City Univ, Hunan Engn Res Ctr Dev & Applicat Ceramsite Concre, Yiyang 413000, Peoples R China.;[Tang, Huang] Changsha Univ Sci &Technol, Key Lab Safety Control Bridge Engn Minist Educ, Changsha 410114, Peoples R China.;[Xiao, Linfa] East China Jiaotong Univ, Sch Transportat Engn, Nanchang 330013, Jiangxi, Peoples R China.
通讯机构：
[Yang, YM ] H;Hunan City Univ, Hunan Engn Res Ctr Dev & Applicat Ceramsite Concre, Yiyang 413000, Peoples R China.
关键词：
Chloride salt erosion;Freeze-thaw cycle;Interface shear strength;Self-compacting concrete
摘要：
Self-compacting concrete (SCC) has been widely used for concrete jacketing to strengthen RC structures due to its high workability, fluidity, and segregation resistance. In this study, a test was carried out to study the effects of substrate curing including chloride salt erosion and the freeze–thaw cycle on the interface shear strength between ordinary concrete and the SCC. Eighty-four Z-type specimens were designed and tested through direct shear experiments, and the influence of interface treatment (implanting steel bar and cutting groove), concrete type, and substrate curing on the interface shear strength were analyzed. Four calculation models of interface shear strength based on different codes are compared, the applicability of these models is also analyzed. The results show that: For close the substrate concrete and the SCC strength, the effect of chloride salt erosion and freeze–thaw cycle will cause a slight decrease in the interface shear strength compared with the specimen that substrate is not cured, the influence of chloride ion erosion and freeze–thaw cycle on the degeneration of interface shear strength for specimen with implanting steel bar is not more obviously than specimen with cutting groove. Any single code model can not accurately predict the interface shear strength of all specimens with different interface treatments and substrate curing. The fib model can accurately predict interface shear strength of specimens which the average compressive strength of old and new concrete is less than 40 MPa and the substrate is not cured. Whether the substrate is cured or not, EC2 and CSA A23.3–14 models can quite accurately predict the interface shear strength of specimens with an implanting steel bar, but for specimens with cutting groove, the modified AASHTO model can accurately predict the interface shear strength. Except modified AASHTO model, the factor considering the effect of interface treatment should be taken into account when using fib, EC2 and CSA A23.3–14 models to calculate the interface shear strength.
摘要：
Most plants belonging to the widely distributed genus Dianthus are used for gardening. Interspecific hybridization of different Dianthus species leads to blurred genetic backgrounds. To obtain more genomic resources and understand the phylogenetic relationships among Dianthus species, the chloroplast genomes of 12 Dianthus species, including nine Dianthus gratianopolitanus varieties, were analyzed. The chloroplast genomes of these 12 species exhibited similar sizes (149,474-149,735 bp), with Dianthus caryophyllus having a chloroplast genome size of 149,604 bp marked by a significant contraction in inverted repeats. In the chloroplast genome of Dianthus, we identified 124-126 annotated genes, including 83-84 protein-coding genes. Notably, D. caryophyllus had 83 protein-coding genes but lacked rpl2. The repeat sequences of the chloroplast genome were consistent among species, and variations in the sequence were limited and not prominent. However, notable gene replacements were observed in the boundary region. Phylogenetic analysis of Dianthus indicated that D. caryophyllus and D. gratianopolitanus were most closely related, suggesting that the degree of variation within nine Dianthus varieties was no less than the variation observed between species. These differences provide a theoretical foundation for a more comprehensive understanding of the diversity within Dianthus species.
期刊：
IEEE Transactions on Intelligent Transportation Systems,2023年25(3):3128-3139 ISSN：1524-9050
通讯作者：
Teh, J
作者机构：
[Su, Yi; Teh, Jiashen] Univ Sains Malaysia USM, Sch Elect & Elect Engn, Nibong Tebal 14300, Penang, Malaysia.;[Chen, Changqing] Hunan City Univ, Key Lab Energy Monitoring & Edge Comp Smart City, Yiyang 413002, Peoples R China.
通讯机构：
[Teh, J ] U;Univ Sains Malaysia USM, Sch Elect & Elect Engn, Nibong Tebal 14300, Penang, Malaysia.
关键词：
AC/DC hybrid distribution system;Behavioral sciences;cloud-edge-device;Computer architecture;cyber-physical-social system;Dispatching;electric vehicles;Generators;optimal distributed dispatch;Optimization;Real-time systems;Renewable energy sources
摘要：
By taking into account the social behaviors of renewable distributed generations (RDGs) and electric vehicles (EVs), the multi-operator AC/DC hybrid distribution system (HDS) has evolved into a cyber-physical-social system (CPSS), necessitating an appropriate architecture. In this paper, a distributed CPSS architecture is proposed for the multi-operator AC/DC HDS using a cloud-edge-device cooperation. The architecture incorporates a model that distinguishes different types of EVs, enabling the demonstration of the interaction among the cyber, physical, and social systems. To address issues of transmission delay and noisy, a Non-ideal Communication Alternating Direction Method of Multipliers is employed. The proposed framework consists of three stages: day-ahead economic dispatch, intra-day security dispatch, and real-time adjustment. This enables efficient dispatching of EVs based on economic and node voltage considerations while optimizing the performance of renewable distributed generators for each operator. Case studies are conducted to demonstrate the effectiveness of the CPSS structure in achieving distributed dispatching the HDS.
作者机构：
[Ren, Ke; Huang, Zhiliang; Li, Hangyang; Zhang, Wenfang; Li, Zehai; Li, HY; Yang, Tongguang; Chen, Mingjie] Hunan City Univ, Smart City Energy Percept & Low Carbon Mfg Sci Pop, Yiyang, Hunan, Peoples R China.
通讯机构：
[Li, HY ] H;Hunan City Univ, Smart City Energy Percept & Low Carbon Mfg Sci Pop, Yiyang, Hunan, Peoples R China.
摘要：
This empirical research creates and assesses a community interaction open-source learning framework. The framework established an efficient open-source learning environment for engineering courses to develop undergraduates' sustainability competencies. The teaching practice of the framework was designed into three stages: course preparation, theory lecture, and project practice. In the teaching practice, community interaction elements were embedded, including community/student two-way selection, systemic teaching and difficulty discussion, expert/student negotiation on teaching forms, teacher/expert coordination on teaching contents, and expert/student two-way feedback on schedules. The interaction elements between students, teachers, and experts enhanced the effectiveness of open-source learning in engineering courses. The experimental results showed that the students exhibited a positive attitude and high participation in the learning procedure and reported a sense of achievement in the project practice. The open-source learning framework significantly improved systemic thinking, conceptual understanding, interdisciplinary collaboration and professional skills. It enhanced students' key sustainability competencies and laid the foundation for them to become expertise-based innovators and open-source community contributors.
期刊：
INTERNATIONAL JOURNAL OF EXERGY,2023年40(4):365-391 ISSN：1742-8297
通讯作者：
Xiang, XA
作者机构：
[Peng, Deyong; Zhou, Jun; Xiang, Xianan; Zhou, Xuehua; Deng, Zhiya; Li, Yongsuo] Hunan City Univ, Sch Municipal & Geomat Engn, Yiyang 413000, Hunan, Peoples R China.;[Wang, Chenhua] Univ Tianjin, Sch Civil Engn, Tianjin 300072, Peoples R China.
通讯机构：
[Xiang, XA ] H;Hunan City Univ, Sch Municipal & Geomat Engn, Yiyang 413000, Hunan, Peoples R China.
关键词：
exergy;AHP-FCE;rural solid waste;gasification;fixed bed
摘要：
An analytic hierarchy process-fuzzy comprehensive evaluation method (AHP-FCE) based on exergy analysis is proposed to evaluate the rural solid waste fixed-bed gasification process. The influence of gasification temperature, equivalence ratio (ER) and gasification agent on the gasification evaluation score are studied. Firstly, the exergy efficiency of gasification system is calculated by exergy analysis. Secondly, the AHP method is used to establish the optimal gasification process model, and the weight of the selected evaluation indexes is determined. The evaluation indexes include exergy efficiency, gas production rate, lower heating value (LHV) of producer gas, greenhouse gas emissions and waste residue emissions. Finally, the priority ranking of different gasification processes is obtained by the FCE method. The results show that when the gasification temperature is 1,000 degrees C and the ER is 0.35, the gasification score is the highest. The oxygen/steam gasification is better than steam gasification and air gasification.
作者机构：
[Yang, Rihua; Wang, Xinzhong; Yang, Yiming] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.;[Yang, Rihua] Hunan City Univ, Hunan Engn Res Ctr Dev & Applicat Ceramsite Concre, Yiyang 413000, Peoples R China.;[Zhang, Xuhui] Xiangtan Univ, Sch Civil Engn & Mech, Xiangtan 411105, Peoples R China.
通讯机构：
[Yang, YM ] H;Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.
关键词：
bond performance;bridge engineering;corrosion fracture;numerical simulation;secondary anchorage
摘要：
In order to explore the secondary bond anchorage performance between prestressed tendons and concrete after the fracture of steel strands in post-tensioned, prestressed concrete (PPC) beams, a total of seven post-tensioned, prestressed concrete specimens with a size of 3 × 7ϕ15.2 mm were constructed firstly, and the steel strands at the anchorage end were subjected to corrosion fracture. Then, the pull-out test of the specimens was conducted to explore the secondary anchorage bond mechanism of the residual stress of prestressed tendons experiencing local fracture. Moreover, the influences of factors such as the embedded length, release-tensioning speed, concrete strength, and stirrup configuration on anchorage bond performance were analyzed. Finally, the test results were further verified via finite element analysis. The results show that the failure of pull-out specimens under different parameters can be divided into two types: bond anchorage failure induced by the entire pull-out of steel strands and material failure triggered by the rupture of steel strands. The bond anchorage failure mechanism between steel strands and the concrete was revealed by combining the failure characteristics and pull-out load-slippage relation curves. The bond strength between prestressed steel strands and concrete can be enhanced by increasing the embedded length of steel strands, elevating the concrete strength grade, and enlarging the diameter of stirrups so that the specimens are turned from bond anchorage failure into material failure.
摘要：
Urban vitality is an important reflection of a city’s development potential and urban quality. This study used exploratory spatio-temporal big data such as social media check-ins to portray the spatio-temporal evolution of urban vitality at the subdistrict scale in Changsha, a city in central China, from 2013 to 2021, finding that urban vitality in Changsha exhibited central agglomeration and outward circling expansion over time, and then we used Geodetector and spatial regression analyses to explain the interactive effects and spatio-temporal heterogeneity of the spatial elements of subdistrict form, subdistrict function, and subdistrict economy on urban vitality. The results show the following: (1) The subdistrict form and subdistrict function dimensions had a significant effect on urban vitality, and the effect of the economic dimension of the subdistrict was not significant. (2) The interaction effect of the density of entertainment and leisure facilities and the density of business office facilities in subdistrict function was the dominant factor in the change of urban vitality. (3) Under the spatio-temporal effect, land use diversity and park facility density had the strongest positive effect on urban vitality; road density and shopping facility density had the weakest effect. The study aimed to provide a reference for the optimization and allocation of spatial elements of subdistricts in sustainable urban development and urban renewal, in order to achieve the purpose of urban vitality creation and enhancement.
作者：
Chi, Nianping;Liu, Jiajun;Lei, Minghua;Feng, Li
期刊：
Environmental Science and Pollution Research,2023年30(5):13079-13093 ISSN：0944-1344
通讯作者：
Li Feng
作者机构：
[Chi, Nianping] Hunan City Univ, Hunan Prov Engn & Technol Res Ctr Rural Water Qua, Sch Municipal & Geomat Engn, Yiyang 413000, Hunan, Peoples R China.;[Lei, Minghua; Feng, Li; Liu, Jiajun] Guangdong Univ Technol, Guangzhou Higher Educ Mega Ctr, Sch Civil & Transportat Engn, 100 Waihuan Xi Rd, Guangzhou 510006, Guangdong, Peoples R China.
通讯机构：
[Feng, Li] S;School of Civil and Transportation Engineering, Guangdong University of Technology, No100, Waihuan Xi Road, Guangzhou, Higher Education Mega Center, Panyu District, Guangzhou, 510006, Guangdong, People's Republic of China.
期刊：
Journal of Materials Research and Technology,2023年23:5181-5192 ISSN：2238-7854
通讯作者：
Hongbo Xia<&wdkj&>Yunwu Ma
作者机构：
[Wang, Qinghang; Wang, Li; Xia, Hongbo; Chen, Shuai; Zhai, Haowei] Yangzhou Univ, Sch Mech Engn, Yangzhou 225127, Peoples R China.;[Wang, Qinghang; Huang, Lixin] CIT Dicastal Co Ltd, Qinhuangdao 066000, Peoples R China.;[Zhao, Jun] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413002, Peoples R China.;[Ma, Yunwu] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai Key Lab Digital Manufacture Thin Walled S, Shanghai 200240, Peoples R China.;[Ma, Yunwu] Shanghai Jiao Tong Univ, Sch Mech Engn, State Key Lab Mech Syst & Vibrat, Shanghai 200240, Peoples R China.
通讯机构：
[Hongbo Xia; Yunwu Ma] S;School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China<&wdkj&>Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China<&wdkj&>State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
摘要：
Friction stir welding (FSW) is a new solid-state joining process for joining light metals, such as magnesium (Mg) alloys. However, the texture-induced softening mechanism (in stir zone, SZ) tends to cause the worsening of mechanical properties in FSW Mg alloys. In this work, multi-pass hot-rolling and subsequent annealing is used to ameliorate the FSW AZ31 alloy plate. The results show that multi-pass hot-rolling leads to the c-axes of most grains in the SZ approximately perpendicular to the normal direction (ND) transforming into these almost parallel to the ND, accompanied with multiple twin types. After subsequent annealing, twins, as nucleation sites, promote the formation of new grains with off-basal texture, resulting in the weak basal texture. Compared with the FSW plate and the initial plate, the rolled-annealed FSW plate exhibits a relatively uniform hardness distribution and a "strength-ductility" synergy, which are mainly attributed to an appropriate texture feature and a homogeneous grain structure. This work provides a new idea for the development of new high-performance FSW Mg alloys. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC
期刊：
Journal of Materials Science: Materials in Electronics,2023年34(15):1-7 ISSN：0957-4522
通讯作者：
Wang, Haiou;Huo, DX
作者机构：
[Su, Kunpeng; Dong, Fuxiao; Hu, Xiaojie; Wang, Haiou; Huo, Dexuan; Zhao, Bojun; Yang, Dexin; Wang, HO; Wang, Yan] Hangzhou Dianzi Univ, Inst Mat Phys, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key L, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China.
通讯机构：
[Huo, DX ; Wang, HO] H;Hangzhou Dianzi Univ, Inst Mat Phys, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.
摘要：
The magnetocaloric and ferromagnetic properties of Pr0.7Sr0.3MnO3 film grown on (001) Pb(Mg1/3Nb2/3)(0.7)Ti0.3O3 (PMN-PT) using pulsed laser deposition technology have been investigated in this work. The X-ray diffraction measurement shows that the (001)-oriented film has been successfully deposited on PMN-PT substrate. The ferromagnetic properties and magnetocaloric effect resulted from ferromagnetic transition are explored via using the magnetic moment versus temperature plots, hysteresis loops, and the magnetic moment versus magnetic field curves. The magnetic moment versus temperature plots (M-T curves) show that with the decrease of temperature, the Pr0.7Sr0.3MnO3 film undergoes a transition from paramagnetic to ferromagnetic phase at temperature close to Curie-Weiss temperature (T-CW). T-CW (approximately 133 K) is determined by the Curie-Weiss law. The Pr0.7Sr0.3MnO3 film reveals the ferromagnetic feature below T-CW, while the film exhibits the paramagnetic state at temperature higher than T-CW. Hysteresis loops also confirm that the film reveals ferromagnetic feature at temperature lower than T-CW (e.g. ferromagnetic behaviors at 10 and 100 K). The result of hysteresis loops is in accordance with the M-T curves. Besides, entropy change has been investigated in our work. The maximum entropy change of Pr0.7Sr0.3MnO3 film reaches about 2.4 J/kg center dot K at around T-CW under 10 kOe field change, that is close to the entropy change of reference sample Gd (approximately 2.8 J/kg center dot K within the field change of 10 kOe), suggesting that the Pr0.7Sr0.3MnO3 film on PMN-PT has a great application prospect in magnetic refrigeration.
作者：
Peng, Li;Alsenani, Theyab R.;Li, Mingkui;Lin, Haitao;Sabeh, Hala Najwan;...
期刊：
Process Safety and Environmental Protection,2023年178:622-641 ISSN：0957-5820
通讯作者：
Alsenani, TR;Li, MK;Alturise, F
作者机构：
[Peng, Li] Hunan City Univ, Key Lab Energy Monitoring & Edge Comp Smart City, Yiyang 413002, Peoples R China.;[Alsenani, Theyab R.; Alsenani, TR] Prince Sattam Bin Abdulaziz Univ, Coll Engn Al Kharj, Dept Elect Engn, Al Kharj 11942, Saudi Arabia.;[Li, Mingkui; Li, MK; Lin, Haitao] Yuxi Normal Univ, Yuxi 653100, Yunnan, Peoples R China.;[Sabeh, Hala Najwan] Tishk Int Univ, Fac Appl Sci, Informat Technol Dept, Erbil, Iraq.;[Alturise, Fahad; Alkhalaf, Salem; Alturise, F; Alkhalifah, Tamim] Qassim Univ, Coll Sci & Arts Ar Rass, Dept Comp, Ar Rass, Qassim, Saudi Arabia.
通讯机构：
[Li, MK ] Y;[Alturise, F ] Q;[Alsenani, TR ] P;Prince Sattam Bin Abdulaziz Univ, Coll Engn Al Kharj, Dept Elect Engn, Al Kharj 11942, Saudi Arabia.;Yuxi Normal Univ, Yuxi 653100, Yunnan, Peoples R China.
摘要：
Adopting innovative technologies like machine learning is crucial for achieving our sustainability goals. It has great potential for improving waste management and energy generation. The development of energy systems with machine learning algorithms is advancing rapidly. By conducting an in-depth comparison between the linear and non-linear regression models, this study makes a significant contribution to the field of waste-to-energy systems. The focus of this research is to forecast the performance of a newly designed solid waste-to-multi-generation energy system. This multi-generational energy system is designed to provide multiple outputs simultaneously, including power, heat, hydrogen, oxygen, and distilled water. In order to estimate the outputs of this system, both linear and non-linear algorithms are utilized and their respective performances are thoroughly analyzed and compared. The linear algorithms demonstrate notable precision through the creation of models that exhibit R-square values exceeding 96 %. In contrast, the non-linear algorithms demonstrate increased precision with R-square values surpassing 97 %, and even suggesting R-square values as impressive as 99 %, thereby attesting to the superior performance of these algorithms. Linear regression models are capable of providing predictions and identifying trends. However, non-linear regression models exhibit enhanced accuracy in predicting outcomes and are more efficient in capturing dynamic trends.
作者机构：
[Liu, Changhui; Wang, Zhiya; Liu, Rong; Yi, Xin; Hu, Yongjun; Fu, Zhifang] Hunan City Univ, Coll Chem & Mat Engn, Hunan Prov Key Lab Dark Tea & Jin Hua, Yiyang 413000, Peoples R China.;[Wu, Zhaoyang; Liu, Rong] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Peoples R China.;[Pan, Dong] Zhejiang Addenda Adv Energy Mat Co Ltd, Huzhou 313000, Peoples R China.
通讯机构：
[Rong Liu; Yongjun Hu] H;[Zhaoyang Wu] S;Hunan Provincial Key Lab of Dark Tea and Jin-hua, College of Chemistry and Material Engineering, Hunan City University, Yiyang, P. R. China<&wdkj&>Hunan Provincial Key Lab of Dark Tea and Jin-hua, College of Chemistry and Material Engineering, Hunan City University, Yiyang, P. R. China<&wdkj&>State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P.R.China<&wdkj&>State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P.R.China
摘要：
Copper plays a key role in the human body; meanwhile, excess Cu(2+) ions can result in various diseases. Nanoclusters (NCs) are often used to measure Cu(2+) ions, but there are two difficulties. On the one hand, a single probe of NCs is easily affected by environmental factors. On the other hand, it is difficult to mask the interference of Pb(2+) ions and Cd(2+) ions in the process of detecting Cu(2+) ions. As a new type of quantum dots (QDs), tungsten disulfide quantum dots (WS(2)-QDs) have some advantages of simple synthesis and stable luminescence properties. Stable WS(2)-QDs with blue fluorescence are used as a reference probe, while gold silver nanoclusters (AuAgNCs) with red fluorescence are used as a response probe. A ratiometric fluorescent sensor was constructed by mixing the two styles of fluorescent probes, which is abbreviated as NCs/QDs. This nano-sensor can be used to detect the concentration of Cu(2+) ions, in which the fluorescence of QDs does not change significantly, while the fluorescence of NCs can be quenched by Cu(2+) ions. The concentration of Cu(2+) ions can be determined as low as 0.12 μM with a linear range from 0.3 to 3 μM. The common interference caused by Pb(2+) and Cd(2+) ions can be eliminated by the phosphate buffer solution (PBS). This sensor was used to detect the concentration of Cu(2+) in river water with satisfactory results.
摘要：
The dissolved organic matter (DOM) in landfill pollutes not only the landfill and surroundings, but also the environment far away from the landfill by infiltrating into the soil and/or flowing on the ground surface. Developing an efficient photocatalyst to degrade DOM is an interesting topic. Herein, the catalysts composed of ZnO and reduced graphene oxide (ZnO-rGO) with different morphologies were fabricated with a two-step hydrothermal method. The phase composite and microstructure were analyzed, and the degradation efficiency of the DOM under ultraviolet light was investigated. Three kinds of ZnO-rGO composite catalysts with different morphologies were successfully synthesized, and rGO was coated on the ZnO surface to form heterostructural composite catalysts. The catalyst powders have similar Raman and FT-IR spectra, but have different specific surface areas and band gaps. The degradation efficiency of DOM by ZnO-rGO composites is higher than that of pure ZnO powder. Compared to pure ZnO, ZnO-rGO composite catalysts contain more oxygen vacancies and a narrower band gap, and the heterostructure is beneficial for accelerating electron separation, inhibiting electron recombination.
摘要：
Real mechanisms that are advancing in a complex network exhibit chaotic behaviour. This behaviour is crucial in physical and complex systems involving numerical modelling frameworks because it essentially determines the framework's evolutionary process. In this context, notwithstanding its difficulty, the potential of intentional oversight of the phenomenon has feasible effects; this is why theoretical approaches are advantageous in such scenarios. This study investigates the functioning of a Willamowski-Rossler (W-R) mechanism, including the synchronization of two minimal W-R structures depending on the responsive suggestion technique for regulation, with the purpose of achieving chaos influence in chemical interactions. We investigate the reliability of the steady state at various fractional order (FO) factors. Employing maximum Lyapunov exponents (MLEs), phase depictions, bifurcation schematics, the 0-1 evaluation and approximated entropy, it is demonstrated that adjusting the FOs causes a system's behavioural pattern to undergo a transition from steady to chaotic. In addition to demonstrating that the proposed scheme fits chaotically under certain circumstances, simulation outcomes demonstrate that mathematical modelling is used to illustrate theoretical debates. To verify that the community detects chaos, the MLE and bifurcation illustrations, whose hallmark factors are plotted, display erratic behaviour while effectively attempting to control the chaos.
