bluuebunny/crossref_metadata_2025 huggingface dataset:
Deterioration of binocular vision after alcohol intake influences driving performance
Authors: Martino Francesco , Castro-Torres José Juan , Casares-López Miriam , Ortiz-Peregrina Sonia , Ortiz Carolina , Anera Rosario G.
Published: April 2021

In this study, we assessed the influence of moderate alcohol intake on binocular vision, vergence system and simulated driving performance by analyzing the interactions between visual deterioration and driving variables. Thirty young healthy subjects were recruited. For the analysis, we measured: visual function (visual acuity and stereoacuity), phorias and fusional reserves. Also, we checked Sheard’s and Percival’s criteria at near and far. The accommodative convergence/accommodation (AC/A) ratio was calculated and vergence facility was also obtained at near. A driving simulator was used to assess driving performance under natural conditions and after alcohol consumption with a breath alcohol content of 0.40 mg/l. Alcohol intake significantly reduced binocular visual performance and vergence function, except for vertical phorias, horizontal phoria at near and Sheard’s and Percival’s criteria at near. Driving performance parameters also presented a statistically significant deterioration after alcohol consumption. A statistically significant correlation was found between the deterioration in overall visual function and overall driving performance, highlighting the influence of the visual deterioration on the driving performance. Moderate alcohol consumption impairs binocular visual and simulated driving performances, implying a greater safety hazard. In addition, deteriorations in binocular visual function and vergence correlated with simulated driving impairment, which indicates that the deterioration of binocular vision due to alcohol consumption affects driving, thus reducing road safety.
Decreased heritability and emergence of novel genetic effects on pulse wave velocity from youth to young adulthood
Authors: Huang Yisong , Su Shaoyong , Snieder Harold , Treiber Frank , Kapuku Gaston , Wang Xiaoling
Published: April 2021

Increased arterial stiffness measured by pulse wave velocity (PWV) is an important parameter in the assessment of cardiovascular risk. Our previous longitudinal study has demonstrated that carotid-distal PWV showed reasonable stability throughout youth and young adulthood. This stability might be driven by genetic factors that are expressed consistently over time. We aimed to illustrate the relative contributions of genetic and environmental factors to the stability of carotid-distal PWV from youth to young adulthood. We also examined potential ethnic differences. For this purpose, carotid-distal PWV was measured twice in 497 European American (EA) and African American (AA) twins, with an average interval time of 3 years. Twin modelling on PWV showed that heritability decreased over time (62–35%), with the nonshared environmental influences becoming larger. There was no correlation between the nonshared environmental factors on PWV measured at visit 1 and visit 2, with the phenotypic tracking correlation (r = 0.32) completely explained by shared genetic factors over time. Novel genetic influences were identified accounting for a significant part of the variance (19%) at the second measurement occasion. There was no evidence for ethnic differences. In summary, novel genetic effects appear during development into young adulthood and account for a considerable part of the variation in PWV. Environmental influences become larger with age for PWV.
Porous block copolymer separation membranes for 21st century sanitation and hygiene
Authors: Guo Leiming , Wang Yong , Steinhart Martin
Published: April 2021

This review summarizes design strategies for nanoporous state-of-the-art BCP separation membranes, their preparation, their device integration and their use for water purification.
Recent advances in the application of tetrabromomethane in organic synthesis
Authors: Kumar Sandeep , Shah Tariq A. , Punniyamurthy Tharmalingam
Published: April 2021

This review article covers the use of tetrabromomethane as mediator, catalyst and reagents for organic synthesis for the period from 2007 to 2020.
Route to tunable room temperature electric polarization in SrTiO3–CoFe2O4 heterostructures
Authors: Maurel Laura , Herrero-Martín Javier , Motti Federico , Vasili Hari Babu , Piamonteze Cinthia , Heyderman Laura J. , Scagnoli Valerio
Published: April 2021

We show reversible room temperature control of the Ti band structure in SrTiO3–CoFe2O4 heterostructures exploiting CoFe2O4 magnetostriction. Changes as a function of the applied magnetic field suggest the development of a net electric polarization.
Biofilm inhibition in oral pathogens by nanodiamonds
Authors: Zhang Tongtong , Kalimuthu Shanthini , Rajasekar Vidhyashree , Xu Feng , Yiu Yau Chuen , Hui Tony K. C. , Neelakantan Prasanna , Chu Zhiqin
Published: April 2021

Nanodiamonds were demonstrated to have great effects on inhibiting biofilm formation as well as disrupting the preformed biofilm in several selected orally and systemically important organisms.
Photochemical synthesis and device application of acene–phenacene hybrid molecules, dibenzo[n]phenacenes (n = 5–7)
Authors: Zhang Yanting , Eguchi Ritsuko , Hamao Shino , Goto Kenta , Tani Fumito , Yamaji Minoru , Kubozono Yoshihiro , Okamoto Hideki
Published: April 2021

Dibenzo[n]phenacenes (DBnP, n = 5–7) were applied to the active layers of p-channel FETs and their effective mobilities were evaluated to demonstrate that C2h-symmetrical DB6P showed superior performance to the C2v-symmetrical homologues.
Correction: Towards accurate and precise positions of hydrogen atoms bonded to heavy metal atoms
Authors: Woińska Magdalena , Chodkiewicz Michał L. , Woźniak Krzysztof
Published: April 2021

Correction for ‘Towards accurate and precise positions of hydrogen atoms bonded to heavy metal atoms’ by Magdalena Woińska et al., Chem. Commun., 2021, 57, 3652–3655, DOI: 10.1039/D0CC07661A.
Radical trifluoromethylation
Authors: Xiao Haiwen , Zhang Zhenzhen , Fang Yewen , Zhu Lin , Li Chaozhong
Published: April 2021

Radical trifluoromethylation has been emerging as a versatile tool for the synthesis of trifluoromethylated compounds that play increasingly important roles in pharmaceuticals, agrochemicals and materials science.
Direct excitation strategy for radical generation in organic synthesis
Authors: Sumida Yuto , Ohmiya Hirohisa
Published: April 2021

This tutorial review encompasses the radical generation based on classical methods and photoredox catalysis. It will also focus on radical generation only demanding visible-light, which involves EDA complex and direct photo-excitation strategy.
Short- and long-term effects of capsaicin supplementation on glycemic control: a systematic review and meta-analysis of controlled trials
Authors: Foshati Sahar , Moradi Sajjad , Tavassoly Mohammad , Rouhani Mohammad Hossein
Published: April 2021

Capsaicin supplementation had no significant short- and long-term effects on glycemic control.
Direct synthesis of a jet fuel range dicycloalkane by the aqueous phase hydrodeoxygenation of polycarbonate
Authors: Wang Lulin , Li Guangyi , Cong Yu , Wang Aiqin , Wang Xiaodong , Zhang Tao , Li Ning
Published: April 2021

A jet fuel range high-density C15 dicycloalkane was directly synthesized in a high overall yield (∼90%) by the aqueous phase hydrodeoxygenation of polycarbonate.
Correction: Measured and simulated thermoelectric properties of FeAs2−xSex (x = 0.30–1.0): from marcasite to arsenopyrite structure
Authors: Perez Christopher J. , Devlin Kasey P. , Skaggs Callista M. , Tan Xiaoyan , Frank Corey E. , Badger Jackson R. , Kang Chang-Jong , Emge Thomas J. , Kauzlarich Susan M. , Taufour Valentin , Kotliar Gabriel , Lapidus Saul H. , Greenblatt Martha
Published: April 2021

Correction for ‘Measured and simulated thermoelectric properties of FeAs2−xSex (x = 0.30–1.0): from marcasite to arsenopyrite structure’ by Christopher J. Perez et al., Mater. Adv., 2020, 1, 1390–1398, DOI: 10.1039/D0MA00371A.
Substituted polynorbornene membranes: a modular template for targeted gas separations
Authors: Wang Xinyi , Wilson Trevor J. , Alentiev Dmitry , Gringolts Maria , Finkelshtein Eugene , Bermeshev Maxim , Long Brian K.
Published: April 2021

This perspective focuses on substituted polynorbornenes as a promising modular platform to access advanced gas separation membranes, and highlights their synthetic versatility and robust performance.
Experimental validation of eosin-mediated photo-redox polymerization mechanism and implications for signal amplification applications
Authors: Yee Emma H. , Kim Seunghyeon , Sikes Hadley D.
Published: April 2021

When eosin-mediated, photo-redox polymerization is used to amplify signals in biosensing, oxygen has dual, opposing roles.
‘Proton escalator’ PEI and phosphotungstic acid containing nanofiber membrane with remarkable proton conductivity
Authors: Sun Xiuwei , Liu Shumei , Wu Qingyin , Zhang Shan , Tian Hongrui , Bai Xue , Li Zhuo , Lu Ying , Liu Shuxia
Published: April 2021

Polyethyleneimine (PEI) and phosphotungstic acid (HPW) build an efficient proton transmission path. The segmental movement of flexible PEI speeds up the migration of protons, which acts as a ‘proton-escalator’.
Laser-induced graphene for environmental applications: progress and opportunities
Authors: Cheng Le , Guo Weihua , Cao Xiaohu , Dou Yubing , Huang Libei , Song Yun , Su Jianjun , Zeng Zhiyuan , Ye Ruquan
Published: April 2021

Recent advances in laser-induced graphene (LIG) for environmental applications are comprehensively reviewed. Challenges and opportunities in solving environmental issues using LIG are discussed.
Palladium-catalyzed asymmetric [3 + 2] cycloaddition of vinyl aziridines and α,β-unsaturated imines generated in situ from aryl sulfonyl indoles
Authors: Xiao Shan , Chen Bo , Jiang Qin , He Long , Chu Wen-Dao , He Cheng-Yu , Liu Quan-Zhong
Published: April 2021

The first palladium-catalyzed asymmetric formal [3 + 2] cycloaddition of vinyl aziridines and in situ generated unsaturated imines has been established.
Aziridine used as a vinylidene unit in palladium-catalyzed [2 + 2 + 1] domino annulation
Authors: Zhu Wen-Qing , Zhang Zi-Wei , Han Wen-Yong , Fang Yu-Chen , Yang Ping , Li Lin-Qiang , Chen Yong-Zheng
Published: April 2021

A series of chromone fused methylenecyclopentanes are efficiently constructed in moderate to good yields by Pd-catalyzed [2 + 2 + 1] annulation, in which aziridine is used as a vinylidene unit by cleavage of two C–N bonds for the first time.
Readily-fabricated supported MgO catalysts for efficient and green synthesis of diethyl carbonate from ethyl carbamate and ethanol
Authors: Li Fengjiao , Wang Liguo , Xu Shuang , Liang Shuting , Zhang Ningning
Published: April 2021

The 10% MgO/γ-Al2O3 catalyst exhibited superior activities towards DEC synthesis from EC and ethanol in the fixed bed reactor.
First-principles predictions of low lattice thermal conductivity and high thermoelectric performance of AZnSb (A = Rb, Cs)
Authors: Haque Enamul
Published: April 2021

The layered structure, and presence of heavier elements Rb/Cs and Sb induce high anharmonicity, low Debye temperature, intense phonon scattering, and hence, low lattice thermal conductivity.
Effect of surface energy and roughness on cell adhesion and growth – facile surface modification for enhanced cell culture
Authors: Majhy B. , Priyadarshini P. , Sen A. K.
Published: April 2021

In vitro, cellular processing on polymeric surfaces is fundamental to the development of biosensors, scaffolds for tissue engineering and transplantation.
Electrospun and co-electrospun biopolymer nanofibers for skin wounds on diabetic patients: an overview
Authors: Campa-Siqueiros Paola I. , Madera-Santana Tomás J. , Castillo-Ortega María M. , López-Cervantes Jaime , Ayala-Zavala Jesús F. , Ortiz-Vazquez Elizabeth L.
Published: April 2021

Wound healing treatment in diabetic patients worldwide represents around 2.1 trillion dollars to global health sectors.
Unprecedented hour-long residence time of a cation in a left-handed G-quadruplex
Authors: Winnerdy Fernaldo Richtia , Bakalar Blaž , Das Poulomi , Heddi Brahim , Marchand Adrien , Rosu Frédéric , Gabelica Valérie , Phan Anh Tuân
Published: April 2021

An extremely long-lived cation has been detected in left-handed G-quadruplexes.
Acrylic boronate: a multifunctional C3 building block for catalytic synthesis of rare organoborons and chemoselective heterobifunctional ligations
Authors: Lin Shengjia , Wang Lucia , Sharma Abhishek
Published: April 2021

A novel C3 acylboron building block; acrylic boronate has been developed and its versatility for synthesis of several previously inaccessible organoborons and heterobifunctional ligations is described.
Anion mediated, tunable isoguanosine self-assemblies: decoding the conformation influence and solvent effects
Authors: Liu Mengjia , He Ying , Shan Chuan , Wojtas Lukasz , Ghiviriga Ion , Fathalla Omar , Yan Yu , Li Xiaopeng , Shi Xiaodong
Published: April 2021

The first example of multiple-layer deoxy isoG self-assembly was characterized by X-ray crystal structure. Critical solvent and anion effects were revealed, leading to the controllable formation of various stable isoG assemblies.
Phase separation of p53 precedes aggregation and is affected by oncogenic mutations and ligands
Authors: Petronilho Elaine C. , Pedrote Murilo M. , Marques Mayra A. , Passos Yulli M. , Mota Michelle F. , Jakobus Benjamin , Sousa Gileno dos Santos de , Pereira da Costa Filipe , Felix Adriani L. , Ferretti Giulia D. S. , Almeida Fernando P. , Cordeiro Yraima , Vieira Tuane C. R. G. , de Oliveira Guilherme A. P. , Silva Jerson L.
Published: April 2021

Mutant p53 tends to form aggregates with amyloid properties, especially amyloid oligomers inside the nucleus, which are believed to cause oncogenic gain-of-function (GoF).
Photoelectrochemical concurrent hydrogen generation and heavy metal recovery from polluted acidic mine water
Authors: Jones Ben , Davies Katherine R. , Allan Michael G. , Anantharaj S. , Mabbett Ian , Watson Trystan , Durrant James R. , Kuehnel Moritz F. , Pitchaimuthu Sudhagar
Published: April 2021

The feasibility of a solar-driven photoelectrochemical process to generate hydrogen fuel from metal mine polluted water while simultaneously recovering heavy metals has been explored.
Synergetic effects of DMA cation doping and Cl anion additives induced re-growth of MA1−xDMAxPbI3 perovskites
Authors: Luo Gan , Chen Yuetian , Wang Xingtao , Ren Meng , Wei Ning , Shi Jielin , Miao Yanfeng , Zhang Taiyang , Wang Tianfu , Zhao Yixin
Published: April 2021

We report a dual-ion exchange and alloy method using DMACl to significantly improve the stability and performance of MAPbI3 perovskites.
Reply to the Comment on “Phase transitions, screening and dielectric response of CsPbBr3” by Š. Svirskas, S. Balčiūnas, M. Šimėnas, G. Usevičius, M. Kinka, M. Velička, D. Kubicki, M. E. Castillo, A. Karabanov, V. V. Shvartsman, M. R. Soares, V. Šablinskas, A. N. Salak, D. C. Lupascu and J. Banys, J. Mater. Chem. A, 2020, 8, 14015
Authors: Svirskas Šarūnas , Balčiūnas Sergejus , Šimėnas Mantas , Usevičius Gediminas , Kinka Martynas , Velička Martynas , Kubicki Dominik , Escobar Castillo Marianela , Karabanov Andrei , Shvartsman Vladimir V. , Soares Maria de Rosário , Šablinskas Valdas , Salak Andrei N. , Lupascu Doru C. , Banys Jūras
Published: April 2021

In this contribution, more evidence is provided to support the presence of low-temperature anomaly in CsPbBr3 single crystals.
Improving peroxymonosulfate activation by copper ion-saturated adsorbent-based single atom catalysts for the degradation of organic contaminants: electron-transfer mechanism and the key role of Cu single atoms
Authors: Pan Jingwen , Gao Baoyu , Duan Pijun , Guo Kangying , Akram Muhammad , Xu Xing , Yue Qinyan , Gao Yue
Published: April 2021

Nonradical pathway-based persulfate oxidation technology is considered to be a promising method for high-salinity organic wastewater treatment.
Rotor subunits adaptations in ATP synthases from photosynthetic organisms
Authors: Cheuk Anthony , Meier Thomas
Published: April 2021

Driven by transmembrane electrochemical ion gradients, F-type ATP synthases are the primary source of the universal energy currency, adenosine triphosphate (ATP), throughout all domains of life. The ATP synthase found in the thylakoid membranes of photosynthetic organisms has some unique features not present in other bacterial or mitochondrial systems. Among these is a larger-than-average transmembrane rotor ring and a redox-regulated switch capable of inhibiting ATP hydrolysis activity in the dark by uniquely adapted rotor subunit modifications. Here, we review recent insights into the structure and mechanism of ATP synthases specifically involved in photosynthesis and explore the cellular physiological consequences of these adaptations at short and long time scales.
An optimal scheduling method for integrated power and heat system with multiple thermal flexibilities
Authors: Lin Da , Ni Chouwei , Zhang Xuesong , Huang Junhao
Published: April 2021

Integrated power and heat system (IPHS) is a typical multi-energy system which involves power system and district heating system (DHS). The utilization of thermal flexibilities in the joint operation of power system and district heating system has shown the potential to improve energy efficiency and economic performance. In this paper, an optimal scheduling method for IPHS with multiple thermal flexibilities is proposed. Thermal flexibilities of electric boilers and district heating network (DHN) are modelled and analysed, in which the flexibility of DHN is described by a detailed node-based quasi-dynamic model. The proposed scheduling method is to minimize the operation cost of IPHS. Case study is carried out on a typical IPHS with a 6-node power system and a 12-node DHS. Simulation results show that the scheduling method can reduce the operation cost of IPHS and improve wind accommodation.
Research on On-line Tool Wear Monitoring Technology Based on GPR
Authors: Fan Shan , Huang Yi , Zeng Haixia
Published: April 2021

At present, many kinds of sensors are used for on-line monitoring of cutting process, tool identification and timely replacement. However, most of the original monitoring signals extracted from the cutting process are time series signals, which contain too much process noise. As the signal noise is relatively low, it is difficult to establish a direct relationship with the tool wear. Therefore, how to obtain the effective information from the online monitoring signal and extract the characteristics that can directly reflect the tool wear from the complex original signal, so as to establish an effective and reliable tool wear monitoring system, is the key and difficult problem in the research of the online monitoring technology of tool wear. Firstly, an experimental platform based on the force sensor for on-line monitoring of tool wear was built, and the signal obtained by the force sensor was used to monitor the tool wear, and the feature information was extracted and fused. The innovation of the project lies in the use of Gaussian process regression (GPR) method to predict the tool wear, the use of feature dimensional rise technology, to reduce the impact of noise, on the premise of ensuring the prediction accuracy, improve the confidence interval of GPR prediction results, improve the stability and reliability of the monitoring process.
Research on variable speed operation of static frequency converter for pumped storage units
Authors: Li Haoyuan , Li Guanjun , Yang Bo , Ji Liantao
Published: April 2021

Constant speed pumped storage unit is widely used, however it cannot adjust the input power when working in the electric mode, and cannot work in the best efficiency when the head of the reservoir changes greatly. Therefore, it is necessary to study and develop the variable speed pumped storage systems. This paper has studied on variable speed operation of static frequency converter for pumped storage units. Besides, development status of variable speed pumped storage system at home and abroad is investigated. Furthermore, classification and advantages and disadvantages of variable speed pumped storage system are also introduced, mainly including two typical variable speed pumped storage systems, i.e., doubly-fed variable speed system and full power variable speed system.
Investigation on recognition method of acoustic emission signal of the compressor valve based on CNN and LSTM network
Authors: Wang Yanfeng , Wang Jin , Sun Junwei , Liang Enhao , Wang Tao
Published: April 2021

The valve is one of the important parts of the reciprocating compressor, which directly affects the thermodynamic process and reliability of the compressor. In this paper, acoustic emission (AE) technology is used to predict the dynamic characteristics of valves. The AE signal of the compressor valve is analyzed based on the deep learning method, and the mapping relation between the AE signal and the dynamic characteristics of the valve is obtained. The results show that the prediction accuracy of the models trained by Long Short-Term Memory (LSTM) artificial neural network and Convolutional Neural Network (CNN) is 97% and 95%, respectively, which can accurately predict the dynamic characteristics of the valve. Although the prediction results of CNN are slightly lower than that of LSTM network, the calculation speed of CNN is relatively faster.
Research and application of TOPSIS based on AHP in storage mode
Authors: Zeng Haixia , Zhang Ziqing , Chen Yan , Fan Shan
Published: April 2021

In the field of modern logistics, automated warehousing is a very important subject. This paper discusses the layout principles of storage spaces in warehousing, lists different storage methods of goods, and studies how to use the TOPSIS method based on AHP (analytic hierarchy process), summarizes the detailed methods and steps, to find the optimal storage mode, and makes an effective example application of the storage mode of a warehouse management. The research in this paper is suitable for the method choice of similar type of automatic warehouse storage management. The TOPSIS analysis model based on AHP is easy to analyze and calculate, and has universality in the method choice of automatic warehouse storage management.
Polygonal plot scaling method for plant protection of rotor-like UAVs
Authors: Zou Erbiao
Published: April 2021

In this paper, a universal polygonal block boundary method is proposed to solve the problem of integral shrinkage and integral expansion of the boundary of the operation area when facing complex operation area boundary and obstacle boundary in the plant protection process of rotor-wing unmanned aerial vehicles (UAVs). When rotorcraft UAVs carry out plant protection operation, they cannot spray more or miss spraying, and they cannot have any collision with obstacles. Based on the method proposed in this paper, the boundary of the operation area and the boundary of the obstacles can be shrunk and expanded as a whole, so as to improve the safety factor of UAVs and the operation accuracy and efficiency.
Numerical simulation on the characteristics of smoke exhaust effect with different sets of smoke vent in deep buried inclined channel fire
Authors: Yuhan Lu , cheng Weng Miao , Fang Liu
Published: April 2021

Deep buried metro stations require longer and more inclined exit passages to connect with the outside. The fire characteristics of these inclined and narrow passages are significantly different from those of above-ground or shallow buried metro station exit passages, and at the same time fires in those inclined channels have a greater risk. This paper takes a channel of deep buried tunnel station in Chongqing as an example and simplifies the actual passage to establish a 3D model to study the smoke spread characteristics along the passage with different smoke vent characteristics including shape and location by FDS, as well as temperature distribution characteristic under different working conditions. The results show that: after a fire, smoke will spread upwards rapidly under the action of thermal buoyancy, and mechanical smoke exhaust plays a certain role in controlling smoke, which is more obvious at the beginning of the fire; there are differences in the smoke exhaust efficiency of different smoke extraction openings shape, but the differences are small, and square smoke vents have a slightly better effect on smoke control than other shapes of smoke vents; changing the location of smoke outlets has a greater impact on the environment in the tunnel. When the smoke vent is located directly above the fire source, the mechanical smoke control effect is significantly better than other positions, and as the distance between smoke vent and fire source increases, the average temperature along the passage increases. At the same time, because of the pressure difference after the fire, the emergency staircase and the upstream of the fire source are basically unaffected by smoke.
Effect of strain rate on mechanical properties and microstructure of TRIP steel
Authors: Pan Libo , Zhu Wanjun , Deng Zhaojun , Zuo Zhijiang
Published: April 2021

TRIP effect is one of the important features for TRIP steel. A Nb-Mo microalloyed TRIP steel was developed by employing two different soaking time during annealing, and tensile tests at three different strain rate for specimens after annealing were performed. The microstructures and the volume fraction of retained martensite were examined and analyzed. The result indicated that TRIP steel showed significantly different behaviour at different strain rates. The ultimate tensile strength and total elongation decreased with the strain rate increasing. The dynamic strain aging effect might occur at low strain rate. With shorter soaking time during annealing, microstructure with ultra-refined grain size could be achieved. Fracture surfaces were different at different strain rate. As strain rate increases, the fraction of retained austenite to martensite transformation at failure point decreases which leads to the difference of mechanical properties.
Preparation of g-C3N4/AgIn(MoO4)2 and its photocatalytic degradation of tetracycline hydrochloride
Authors: Jia Lijun , Zhang Qianqian , Yan Xu , Zeng Ke
Published: April 2021

Graphite phased carbon nitride and indium silver molybdate [g-C3N4 / AgIn(MoO4)2]photocatalytic materials were prepared by hydrothermal method. X-ray diffraction, transmission electron microscope, scanning electron microscope, X-ray photoelectric spectrum, UV-vis diffuse reflection spectrum and solid fluorescence were used to analyze its structure and morphology. The results showed that the catalytic activity of g-C3N4 / AgIn(MoO4)2 was significantly higher than that of pure g-C3N4 and AgIn(MoO4)2 under visible light irradiation. Under the conditions of g-C3N4 and AgIn(MoO4)2 with a compound ratio of 2:1 and hydrothermal reaction at 120℃ for 6 hours, the degradation efficiency of tetracycline hydrochloride was the best. After 1 hour of light reaction, the degradation rate of tetracycline hydrochloride could reach 75.3%. g-C3N4/AgIn(MoO4)2 is expected to be a promising photocatalyst for wastewater treatment.
Optimal scheduling method based on building virtual energy storage equivalent battery
Authors: He Wei , Li Jia , Zhao Weizhe , Zhang Yaqing
Published: April 2021

In this paper, an optimal scheduling method based on building virtual energy storage equivalent battery is proposed. Firstly, the thermal load prediction model is built based on the thermodynamic model, and then the equivalent battery model of virtual energy storage is established by combining with inverter air conditioning system model. Then, with the goal of minimizing the user’s electricity cost, considering the constraints of energy storage state and charging and discharging power of equivalent battery model, an optimal scheduling method of building virtual energy storage equivalent battery is constructed. The results show that the proposed method can predict the building thermal load, update the building virtual energy storage equivalent battery parameters, formulate the corresponding optimal scheduling strategy, and reduce the electricity cost of users for heating on the premise of ensuring the thermal comfort of users.
The Status quo, challenges and countermeasures of nuclear power development in China
Authors: Dai Mengyuan
Published: April 2021

In China, the proportion of coal in the energy structure is high, and the utilization of coal will cause carbon emission and environmental pollution. Therefore, the adjustment of energy structure and the utilization of new energy has become the focus of China's efforts to comprehensively promote the green development of energy. At present, developing nuclear power has become a key way to break through the bottleneck of new energy power supply and realize economic and ecological benefits. Based on the current situation and existing problems of China's nuclear power industry, this paper puts forward the challenges and measures for the future development of nuclear power.
A Two-Stage Configuration Method of Integrated Community Energy System Considering Demand Response
Authors: Yang Jianfeng , Xie Tianxiang , Zhang Chang , Dong Jie , Zhang Jianhao , Zhang Hequan
Published: April 2021

The integrated community energy system (ICES) has aroused considerable attention for its low emission and high operating efficiency. The existing configuration methods for ICES with multi-energy sectors ignored the controllable load. In this paper, a two-stage configuration method of ICES is developed to achieve the minimum annual investing and operating cost. At the first stage, the capacities of components in ICES are optimized to minimize the annual investment cost of ICES. At the second stage, the annual operating cost including the electricity and gas purchase costs and the component maintenance cost is minimized to satisfy the energy load. The controllable load under the time-of-use energy price in seasonal typical days is considered in the second stage. Relevant simulations are conducted to validate the effectiveness of the proposed configuration method for ICES. Considering the controllable load, comparative simulations illustrate that the proposed configuration method can significantly reduce the battery investment cost.
The Research of Civil Engineering Certification Information Management System
Authors: Cai Hualong , Peng Chen , Zhu Chengyu , Ouyang Ming
Published: April 2021

In recent years, engineering education professional certification is an important direction for the development of engineering education in our country. Colleges and universities across the country have established various professional student training systems in accordance with the requirements of engineering certification. This article gives a brief introduction to the design and development process of civil engineering certification management information system according to the training standards of engineering certification. The aim of this study is to solve the problem of low efficiency of civil engineering professional engineering certification.
Application of comprehensive geophysical exploration technology in the detection of fault structure in geothermal field target area
Authors: Wang Hua-an , Xiao Bo , Li Xue-shan
Published: April 2021

We applied CSAMT and the resistivity method based on Wenner device to the fault structure detection in a geothermal field target area, and carried out hydrogeological drilling in the geophysical anomaly area. The temperature measurement results in the well showed that the groundwater temperature is more than 50°C, which verified the effectiveness of the comprehensive geophysical method in geothermal resource exploration. The conclusions show that the resistivity method and CSAMT are suitable for the detection of thermal storage fault structures, and the comprehensive analysis method combined with the two methods can more accurately determine the plane distribution and occurrence of concealed fault structures.
Quantitative Measuring Analysis Method and Mechanism of Wear Particle Settlement
Authors: Zhang Kaituo , Lv Zhiyong
Published: April 2021

The size and distribution of wear particle in lubricating oil, as important numerical information available in ferrography, is one of the key indexes in wear diagnosis. In this paper, a new method for measuring the size and distribution of abrasive particles is proposed. First, all the abrasive fluid is left standing until all the abrasive particles are precipitated to the bottom. Then, the measuring container is inverted and the whole precipitation process of abrasive particles is recorded by magnetic induction instrument. And according to the precipitation analysis of the wear particle, the following results were obtained:1) At the initial stage of the particle settlement, the gravity, the buoyancy and the drag force of the oil achieve balance quickly, the time and distance of the wear particle moving at a constant velocity can be neglected. 2) The settling velocity is related to the diameter and specific gravity of the wear particle as well as the specific gravity and viscosity of the oil, the distribution of the wear particle is proportional to the square of the diameter of the particle, using the magnetic induction technology, the distribution of particle can be measured by settling time for different sizes of wear particles. 3) Measure the wear particle oil directly, there are different sizes of particles settlement in the bottom at the same time, which causes the difficulty in identifying the size of the particle settlement. The particle should be settled first, and then inverted, settling the particle in accordance with the order from large to small, which facilitates the measurement of different sizes of the particles, different times correspond to different sizes of the particles. 4) The bigger the particle is, the more accurate the measurement and counting is, the smaller the particle is, the bigger the error is.
Rview of phytoremediation of soil contaminated by vanadium
Authors: Wu Zhen zhong , Yang Jin yan , Zhang You xian , Jia Zong qian
Published: April 2021

Vanadium is a nontrivial multi-valent metallic element, which has been increasingly used in modern society. The widespread application of vanadium promotes the rapid and sound development of the economy and society, simultaneously brings out increasingly prominent environmental problems, e.g., soil vanadium pollution. Therefore, the remediation problem of vanadium-contaminated soil has been received growing attention. Phytoremediation has become a significant constituent in vanadium-contaminated soil remediation attributable to its veritable merits such as cleanness, esthetics, cost-effectiveness, convenience, and sustainability. Phytoremediation is mainly dependent on hyperaccumulator plants, even though the actuality that the vast majority of hyperaccumulator plants are characterized by low biomass yield and slow-growing. Consequently, the intensity in screening the undiscovered hyperaccumulators should be strengthened. Meanwhile, it is imperative to further explore the vanadium accumulation and translocation characteristics of some non-hyperaccumulative but tolerant plants with moderate biomass to remediate the soil contaminated with vanadium. Taken together, further comprehensive researches of tolerance mechanisms of remedial plants against vanadium are quite necessary to decontaminate soils contaminated by vanadium efficiently.
Identification of the Oculo-Motor System in the Form Volterra Model Based on Eye-Tracking Data
Authors: Pavlenko Vitaliy D. , Shamanina Tetiana V. , Chori Vladislav V.
Published: April 2021

Instrumental computing and software tools have been developed for constructing a nonlinear dynamic model of the human oculo-motor system (OMS) based on the data of input-output experiments using test visual stimulus and innovative technology. Volterra model in the form of multidimensional transition functions of the 1st, 2nd and 3rd orders, taking into account the inertial and nonlinear properties of the OMS was used as the identification tool. Eye-tracking data developed in the Matlab environment are tested on real datasets from an experimental study of OMS.
Mathematical Modeling of Working Memory in the Presence of Random Disturbance using Neural Field Equations
Authors: Lima Pedro M. , Erlhagen Wolfram , Kulikov Gennady Yu. , Kulikova Maria V.
Published: April 2021

In this paper, we describe a neural field model which explains how a population of cortical neurons may encode in its firing pattern simultaneously the nature and time of sequential stimulus events. Moreover, we investigate how noise-induced perturbations may affect the coding process. This is obtained by means of a two-dimensional neural field equation, where one dimension represents the nature of the event (for example, the color of a light signal) and the other represents the moment when the signal has occurred. The additive noise is represented by a Q-Wiener process. Some numerical experiments reported are carried out using a computational algorithm for two-dimensional stochastic neural field equations.
Design of Water Fire Extinguishing System for Protection of Metro Rolling Stock Stagnation Zones
Authors: Filippov Ilya , Yusupdzhanov Vladimir , Zybina Olga , Klochihin Ilya , Chalovskaya Ekaterina
Published: April 2021

Metro rolling stock stagnation zones are quite long. This causes a number of difficulties in choosing and designing a water fire extinguishing system, as it directly affects the pressure loss in pipelines when water is supplied over such a long distance. That is why the task of this work is to design two different types of water fire extinguishing for metro dead ends and to perform hydraulic calculations, based on the results of which to choose the most suitable system for the object under study. The choice of a fire extinguishing system to ensure fire safety of dead ends of rolling stock sludge is made in the favor of the fire extinguishing system with high-pressure water spray.
Representation of Social Systems as Nonlinear, Complex, Self-Organizing and Closely Related to Biosystems and Mathematical Model of Their Evolution
Authors: Romanova Ekaterina , Uvarova Ludmila
Published: April 2021

On the basis of the systemic and synergistic approaches, the features and regularity of the selforganizing systems, it is concluded that the social systems are nonlinear, open, complex, self-organizing systems. The scheme-model of the general structure of the social system is considered. Much attentions is given to the interactions of the social systems elements with the biosystems. The graphic model-tree, reflecting the association between the social systems and the biosystems. In connection with that the most significant technologies and the scientific trends, connecting with the biosystems: the gens, the genetic engineering, the artificial intellect, the bio- and nanotechnologies, the biomedicine, microbes, viruses are considered. The futures of the dynamics of the social systems are noted. It is shown, that, with a high probability, the spiral evolutionary processes can occur in the social systems. The mathematical model is presented, that describes the spiral structures, based on the Swift-Hohenberg equation.
Integrated Probabilistic Surface Roughness Assessment for Various Processing Methods
Authors: Bobrovskij Igor , Zibrov Petr , Luk’yanov Aleksey , Levitskih Olesja
Published: April 2021

The surface texture characteristics are specified by international standards, which include dozens of parameters, basically geometrical. The probability of filling the rough surface layer with a material from the reference line and through the layer thickness is proposed as a quantitative roughness assessment. It takes account of geometrical parameters, shape, height and frequency of surface irregularities. An example is given of studying a surface with processing defects, and a comparative analysis of surface treatment methods is presented. The calculation results are summarized in a table of probabilistic characteristics of surfaces for various processing methods.
Determination of Rational Design and Geometric Parameters of a High-Performance Drill Based on a Mathematical Model of the Cutting Part
Authors: Pivkin Petr , Grechishnikov Vladimir , Ershov Artem , Kuptsov Vladimir , Jiang Xiaohui
Published: April 2021

Processing of high-precision holes in one technological operation is an urgent problem of advanced manufacturing. Processing of precise holes in parts for aerospace and machine-building industries with a diameter of up to 30 mm is performed during countersinking, deployment or grinding operations. These operations are applied only if there already exists a pre-treated hole. Monolithic three-fluted drills have been becoming common for processing high-precision holes of 7-8 quality over the last few years. The processing of various types of materials such as stainless steels, cast iron and heat-resistant steels requires rational geometric and structural parameters of the cutting tool. The nature of the load distribution between all the teeth during drilling plays a huge role in the processing efficiency. Even load distribution between the three teeth and a positive geometry improves self-centering and reduces the deviation from the specified axis of the hole. The drill sharpening provides positive geometry along the entire main cutting edge. The influence of the geometric parameters of the cutting edge of the screw groove on the shape of the drill bit is equally important. Existing approaches to the design of the thinning do not account for the influence of the geometric parameters of the cutting edge on the section of the screw groove. Analytical approaches to modelling of the main cutting edges are typically married with difficulties associated with achieving a smooth change in the angle of inclination to the tangent of the cutting edge. The complexity of the aforementioned task is largely due to the presence of critical points at the interface of the spiral groove and thinning. Determining the rational shape of two sections of the main cutting edge performed in this study is a complicated task that includes several steps needed to find the number of nodal points. Achieving a positive rake angle in the normal section to the cutting edge at the gash area that was formed via a special sharpening is one of the most important results of this paper. The rational shape of the cutting edge and the front surface provides an increase in the strength of the cutting part by 1.3 times.
Effect of Geometrical Parameter Cutting Edge on the Toroidal Forming Surface of a Solid End Mill
Authors: Pivkin Petr , Minin Ilya
Published: April 2021

Solid end mill with a toroidal forming section are the most productive solutions in the field of processing difficult-to-process materials. The process of forming the cutting geometry of such cutters is performed on grinding machines with CNC with the use of abrasive grinding wheels. The formation of the cutting edge on the toroidal section is carried out by discrete movements of the working bodies of the machine in accordance with the control program. The disadvantage of the stepper drive used in CNC machines is the limited discreteness of the described trajectory resulted in the loss of accuracy when forming radius, arc, spherical and toroidal sections. Loss of accuracy in the formation of elements of the working geometry of a solid end mill can negatively affect the tool life, and the structural strength of the joints of the transition of working surfaces. The study is aimed at identifying the necessary and sufficient number of points that describe the spatial shape of the cutting edge with acceptable loss of accuracy.
Mathematical Modeling of Production Processes of Discrete Machine-Building Enterprises Based on the Interaction of Simulation Systems and Operational Planning Systems
Authors: Dolgov Vitalii A. , Nikishechkin Petr A. , Leonov Aleksandr A. , Ivashin Sergey S. , Dolgov Nikita V.
Published: April 2021

Analysis of production systems (PS) of discrete multi-nomenclature machine-building enterprises is a complex task, its solution is necessary to support decision-making during technical re-equipment, modernization or technological preparation of production. The paper shows a concept of joint use of operational scheduling systems and simulation modeling systems to improve the efficiency and adequacy of PS analysis. The problem of determining the deviation of the planned state of the PS from the simulated state and evaluating the level of stability and stability of the PS behaviour on its basis is considered. It is revealed that the proposed approach allows us to more adequately determine the timing of the production program, assess the stability of the PS behaviour when using various planning logics and algorithms, and choose the best one for subsequent use in a real PS.
Structural features of metal powders obtained by plasma spraying
Authors: Gulikhandanov Evgeny , Ermakov Sergey
Published: April 2021

The development of additive technologies in the Russian Federation is constrained by the lack of indigenous base for the production of metal powders. SPbPU has developed, manufactured and introduced a plasma atomizer. It provides atomization of metal powders and alloys of various chemical compositions. The data on the main technological parameters of atomization of nickel alloy Inconel 718 and titanium alloy Ti-6A1-4V are presented in the paper. It is shown that by optimizing the spraying mode the possibility to obtain alloy powders with a high level of sphericity and a minimum number of particles with surface and internal defects. The chemical compositions of the obtained particles are almost identical to the composition of the initial atomized materials. Samples for the mechanical testing were made from the obtained powders by the SLM method. The results of mechanical properties tests show that the properties of samples made by 3D printing methods from powders sprayed by plasma atomization methods are identical to the properties of materials made and heat-treated by traditional methods.
Soil cracking propagation due to dryness and its relation to suction
Authors: Oliveira Elisangela do Prado , Soecki Karoline , Faro Vitor Pereira , Kormann Alessander Christopher Morales
Published: April 2021

Investigation of Crack Intensity Factor is essential as it affects the mechanical and hydraulic behaviour of soils. Soil water coming from the wet seasons or from the water table, is removed by evaporation during the driest season. The loss of water provokes a significant increase in suction. When it exceeds the tensile strength of the soil, cracks occur that can modify the mechanical and mainly hydraulic properties of the soil, creating preferred paths for water infiltration. Little research is conducted on quantifying cracking in soil relating it to its hydraulic properties. This research aims to investigate the cracking of soils with focus on analysing its relation to water content and soil suction. Soils from a specific region in Brazil with clay predominance are collected and characterized. Unsaturated soil specimens are prepared and subjected to environmental real conditions in order to progressively check the consequences caused by the environment in soils with different clay content during four weeks. The Crack Intensity Factor is measured along the time through image processing. The water content is monitored through volume water content sensors. The measured results are evaluated to correlate crack intensity factor as function of weather variables and soil water content.