bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Co Ni intercalated vermiculite catalyst in pyrolysis of plastics
Authors: Chen Zicai , Wang Yiqian , Sun Zhipeng 
Published: April 2021

Abstract
Currently, the amount of municipal solid wastes that are hardly degradable in nature keep increasing, of which the waste plastics account for a large proportion. There is no doubt that it will generate severer environmental issues. Therefore, we are expected to develop an efficient way to recycle the useful components in the mixed plastics to reduce the waste of energy and protect the environment. Thermal cracking, as a key technology for plastic recycling, can convert plastics into high value-added fuel products and broaden the sources of raw materials for ethylene, propylene and high value fuel production. For general catalysts, its catalytic activity is affected not only by the specific surface area and pore volume, but also by the acidity. In this paper, we try to construct an adjustable acidity catalyst by adopting vermiculite as the support, and sodium chloride, cetyltrimethylammonium bromide as modifier. That can provide exposed environment for the active sites in the bulk phase. At the same time, cobalt and nickel were used as intercalation to load on vermiculite. Ultimately, we obtained BET, XRD characterization data to determine the structure and properties of the catalyst, and analyzed the cracking products by GC quantitatively and qualitatively to build a reasonable structure-activity relationship.
Analysis for the welding crack leakage of deethanizer
Authors: Jiang Chengjun , Wang Xin , Xue xiaolong , Du Yannan , Wang Wei 
Published: April 2021

Abstract
A deethanizer made of 16MnDR steel was found medium leakage used by a company shortly after weld repair. The cause of the welding crack leakage was analyzed by means of morphology examination, chemical composition analysis and hardness test, residual stress test, metallographic examination, and microscopic metallographic analysis. The results show that the crack produced by the 16MnDR pressure vessel after weld repair is a typical liquefaction crack of weld metal. Improper control of repair operation process results in abnormal microstructure, excessive hardness and excessive residual stress at repair welding position, which leads to the formation of longitudinal microcrack, and further expansion in use to form penetrative crack leakage.
Free vibration of conical shells under arbitrary elastic boundary and simulation verification
Authors: Li Xinghong , Wang Ting , Zhao Yang , Wang Hui 
Published: April 2021

Abstract
This paper presents an analysis of free vibration characteristics of truncated conical shells under complex boundary conditions. Firstly, the geometric equation of conical shells are obtained by using Reissner shell theory. Then, by using Rayleigh- Ritz method with improved Fourier series, the motion equations of modal parameters (modal stiffness, modal mass, natural frequency and model shapes) with elastic boundary are obtained. The mode shapes and natural frequencies of conical shells can be obtained by solving the motion equations. Moreover, by comparing the results for simulation numerical method and finite element method(FEM) respectively, the validity of present methodology has been verified.
Simulation and Parameter Optimization of Pilot Internal Flow Overflow Valve
Authors: Li Guanghui , Wang Lipeng , Qiao Jing , Wei Guanju , Han Xinmiao , Hou Dingqi , Guo Jungang 
Published: April 2021

Abstract
Aiming at the pilot internal overflow valve, the working principle is introduced, and the simulation model is established by AMESim. The pre-compression force of pilot spring is calculated by NLPQL. The influence on the dynamic characteristics of the pilot spring stiffness, damping hole diameter, the diameter of main valve core is analyzed by batch processing. Then the Genetic Algorithm(GA) is used to obtain optimal valve of structural parameters, which can provide a theoretical basis for dynamic characteristics.
Flow Stress Behavior and Microstructural Evolution of DC Cast 7065 Aluminum Alloy During Hot Compression Deformation
Authors: He Kezhun , Tan Zimeng , Zheng Xu , Zhang Xinming , Chen Biao , Zhou Kechao 
Published: April 2021

Abstract
The deformation behavior and microstructure evolution of DC cast 7065 aluminum alloy was investigated in the temperature range of 340-460 ℃ and strain rate range of 0.1-8 s-1. The flow stresses of the 7065 alloy are forceful function of deformation strain rate and temperature. The peak stress raises with reducing compression temperature, and at a designated deformation temperature, the peak stress increases with the increasing of strain rate. The hot deformation equation of the alloy is generated, and the deformation activation energy of the alloy is 117.869 kJ/mol. When the samples were deformed above 380℃, the α-aluminum dendrite in the initial microstructure was replaced by recrystallized grains, dynamic recrystallisation occurred during compression.
Effects of Sloped Trench Casing Treatment Combined with Air Injection on Aerodynamic Performance of a 1.5 Stage Axial Flow Compressor
Authors: Kai-kai Zou , Yong-bao Liu , You-hong Yu , Xing He 
Published: April 2021

Abstract
A new mode, sloped trench casing treatment combined with air injection, was designed and introduced in a 1.5 stage axial compressor. To reveal the effects of this mode on the aerodynamic performance, a three-dimensional numerical simulation was carried out. Three air injection configurations were set to reflect the influence of injected flow velocity and injected mass flow rate. Results show that sloped trench casing treatment combined with air injection could improve the stall margin, total pressure ratio, and adiabatic efficiency of the compressor simultaneously. Moreover, injected flow velocity has a more significant influence on the effectiveness of extending stability than the injected mass flow rate. The optimal configuration obtains the stall margin improvement of 8.37% by using only 0.69% of the whole annulus mass flow rate. Based on a detailed analysis of the rotor flow field, it is found that the high-speed jet causes axial momentum of the incoming flow upstream the rotor blade tip to increase and load of the forepart chord of the rotor blade tip to reduce. The blockage in the tip region of the rotor passage is thus suppressed effectively, which results in the stall margin of the compressor enhanced.
Computational Fluid Dynamics(CFD) of Drag Force for Bullet’s Shape Design
Authors: Gan Chenjie 
Published: April 2021

Abstract
The factors in bullet’s shape design which affect the drag force of bullets are important in aerodynamics, especially in ballistics. In this paper, based on traditional researches about different bullet shape designs, nose cone design of the bullet is mainly discussed, as well as the hollow tip and the rifling on the appearance of the bullet are also included. This paper adopts Fusion 360 and Ansys fluent to calculate and model. This research verifies the similarity of the drag coefficient of different bullet shape design at a low speed and figures out the best shape characteristic coefficient in Haack series design, while some problems still exists in the influence of hollow tips of the bullet to the drag force.
An Empirical Study on Process Management System using YOLO-Based Parts Recognition
Authors: Park Jongcheol , Jang Wonho , Yoo Namhyun 
Published: April 2021

Abstract
The process of assembling the engines used in medium and large ships appears to be a continuous production process, but it is not the process through which numerous workers perform work with automated equipment or simple assembly work, but rather a process through which skilled workers, who can effectively perform various tasks, perform multiple aspects of the assembly process. Due to this characteristic, it was difficult to assess the work process rate during the engine assembly process through real-time analysis of the process because it was difficult to shorten the lead time or improve the process, and most of stages of the process depend on manual reports or operators’ work data input. Therefore, in this study, we developed and applied a system capable of recognizing the current process rate by identifying specific engine parts using YOLO.
Numerical investigations of the minimum-B effect in Electron Cyclotron Resonance Ion Source
Authors: Mironov V. , Bogomolov S. , Bondarchenko A. , Efremov A. , Loginov V. , Pugachev D. 
Published: April 2021

Abstract
The three-dimensional particle-in-cell model NAM-ECRIS is used for investigation of how the DECRIS-PM Electron Cyclotron Resonance Ion Source is reacting to changes in the source magnetic configuration. The accent is made on changes in the magnetic field at the magnetic trap center, the minimum-B value. It is calculated that the optimal normalized value of the field is ∼0.8, close to the experimental observations. The reasons for existence of the optimum are discussed. It is observed that the electron energies are increasing with the increased minimum-B values due to enhanced confinement of the energetic electrons in the plasma. Bumps in energy spectra of the radially lost electrons are observed and explained to be due to nonadiabatic losses of electrons.
Study on secondary deepening design of exterior wall panel of Substation Prefabricated Building
Authors: Wang Yamin , Wu Hailiang , Zhang Wuchen , Liu Zhong , Cheng Nan , Su Jizhi 
Published: April 2021

Abstract
With the continuous progress of the manufacturing industry and the urgent demand for new building forms in the electric power industry, the prefabricated steel structure buildings have been widely applied in the substation design of State Grid Corporation of China, which can effectively reduce the wet operation on site and the project cost. This paper takes the exterior panel design of prefabricated steel structure building in substation as the research object, and explores the technical application of the secondary design of exterior panel of prefabricated steel structure building through combining the actual project and the existing wall panel type, which provides a reference for the development direction of prefabricated building in the future.
Three problems of the spatial organization of urbanized territories
Authors: Krasheninnikov A V 
Published: April 2021

Abstract
The article examines the methodological problems of modern urban planning exemplified by the next “new” initiative. The weakness of the declared goals, of methods and means of the modern urban planning practice is shown. The root of the problem lies in the elimination of professionally trained people from all spheres of urban planning. The problems of the spatial organization of urbanized areas are concentrated today around the issues of social comfort of the urban environment. Therefore, the study of the peculiarities of people’s perception of the surrounding architectural space can become a methodological platform for overcoming urgent problems of urban planning. The path to the development of a comfortable urban environment runs through the development of a program to obtain a meaningful, expressive, memorable system of images. Cognitive urban studies allow one to give a systematic assessment of models of urban spaces and add a humanitarian aspect to the algorithms for the spatial organization of urbanized territories.
“Poetics of the urban environment” in the context of the global aestheticization
Authors: Rukavishnikov A G , Ganat S A 
Published: April 2021

Abstract
The article focuses on the importance of using the developments of aesthetics as a theoretical framework for applied urban research. The need for this is prompted by the internal logic of the process of “global aestheticization” now taking place in the field of the humanities. According to a number of reputable scientists (in particular, one of the most famous modern German philosophers Wolfang Welsch), in the context of the revision of the usual forms of experience and the spread of virtual communication practices, aesthetics has the potential to become a kind of a synthetic science, interpreting the rapidly spreading “derealization of “reality”. At the same time, it is obvious that aesthetics can no longer remain within the narrow framework of philosophical discourse, but is called upon to go beyond it into the realm of existence and conduct a comprehensive analysis of specific manifestations of the sociocultural life of a modern person, in particular, heterogeneous urban processes, “poetics of the urban environment.”
Contemporary geniuses of place as a phenomenon of urban development
Authors: Markwart E , Vinogradov I , Guryanov G 
Published: April 2021

Abstract
The concept of genius loci has been widely studied in the scientific literature, mainly in relation to the “spirit of place” concept, and outstanding personalities of the past. The paper examines the phenomenon of the “genius of place” as a living person acting here and now, and highlights a specific role he plays in the development of “place”. The authors argue that the role of the “geniuses” is especially noticeable in small towns and settlements. A number of studied cases allow us to identify found “geniuses of places” mostly as “varangians” (outlanders). The paper draws initial conclusions regarding the interaction of “genius” and “place”, formulates possible hypotheses and directions for further research.
“Smart” nuclear cities and training
Authors: Putilov A V , Chervyakov V N , Kolykhalov P I 
Published: April 2021

Abstract
New innovative approaches to educational activities in “smart” nuclear cities are described. Examples of using the developed system of online control over student perception of materials of a particular discipline are given. Processing the results of monitoring the educational process allows you to draw preliminary conclusions about the abilities (giftedness) of students for certain types of activities, described, including in the course materials. The software and hardware complex can be used for other educational programs, which, depending on the subject area of study, allows you to form a kind of “digital portrait” of each student.
The productivity of a high-tech municipality: basic parameters and factors (based on the material of nuclear cities)
Authors: Polosin A V , Chikharev I A , Kostyuchenko M I , Ganat S A , Samoilova E S 
Published: April 2021

Abstract
Technological (digital) transformation, the evolution of the socio-demographic structure, profound changes in the economy of cities and the urban environment in the modern world determine the relevance of the search for new approaches to urban development. At the same time, high-tech municipalities, and in particular - Russian nuclear cities, possess significant features against the background of global trends. Using the methodology of systems analysis, expert surveys and comparative case studies, the article analyzes the productivity parameters of a high-tech municipality and approaches to urban development based on the material of Russian nuclear cities.
Retraction: An Empirical Study on the Driving Path of Optimizing the Resources Allocation of Foreign Trade Enterprises from the Perspective of Energy Supply-side Reform (IOP Conf. Ser.: Earth Environ. Sci.
94 012054)
Authors: You Yu-cong , Yi Lu-xia 
Published: April 2021

IOP Publishing Limited ("IOPP") is retracting this paper following an investigation which revealed that sections of the manuscript are computer generated. IOP Publishing is investigating why this was not identified during the submission and peer review process by the conference. As a member of the Committee for Publication Ethics (COPE) this has been investigated in accordance with COPE guidelines and it was agreed the article should be retracted.
IOPP expresses its thanks to the independent advisors who have shared their thoughts regarding this paper during the course of the investigation.
Retraction published: 28 April 2021
Effects of Fe-Doped Electrolyte and Feed Flow Rate Evaluation in Home Made Solid Oxide Fuel Cell
Authors: Devianto Hary , Nurdin Isdiriyani , Widiatmoko Pramujo , Adi Prasetya Kafi , Pradipta Basil 
Published: April 2021

Abstract
Solid Oxide Fuel Cell (SOFC) is one type of fuel cell that has several advantages over other types of fuel cells. To achieve low cost SOFC, the materials used are nickel oxide (NiO) for the anode, Calcia Stabilized Zirconia (SCZ) for the electrolyte and Calcia Cobalt Oxide Zinc Oxide (CCZO) as cathode. Fe2O3 is a doping agent to form a denser electrolyte. The cell with and without Fe doping was tested using hydrogen and ambient air. Additionally, the effect of the amount of fuel flow rate is also investigated using Aspen Plus Modelling. Based on physical characterization, it is determined that 3%-mole Fe doping on the electrolyte increases the electrolyte density from 83% to 90%. Using electrochemical impedance spectroscopy, it can be concluded that SOFC with Fe doped electrolyte has a lower resistance than SOFC without Fe doping. On the other hand, using a correction factor, an equation of power correlated to fuel flow for the SOFC is generated to show increasing fuel flow enhanced SOFC performance.
Circular Economy on Organic Waste Management with MASARO Technology
Authors: Abidin A Z , Bramantyo H , Baroroh M K , Egiyawati C 
Published: April 2021

Abstract
MASARO technology presents a solution in solving the waste problem through an organic waste processing unit, known as IPPO (Organic Fertilizer and Feed Industry). The Masaro system characterises solid waste into five catagories including organic waste, low value plastic waste, incenerated waste, recycled waste, and hazardous waste. The organic waste will be separated into an organic fast-decaying waste to produce POCI (Special Liquid Organic Fertilizer) and KOCI (Special Liquid Organic Concentrate), and an organic slow-decaying waste to produce a compost. POCI is used as an organic fertilizer and its farming produces a higher production number, higher quality product, faster production rate while its production cost is lower. KOCI and compost is applied in the farm industry where the organic waste with low economic value is used as a raw material to produce new materials with higher economic value. These products can produce an environmentally friendly system and reflect the circular economy principle application. The organic waste is used as raw material for IPPO and its products form a circular economy through aplication in the farm industry that create lower cost production and sustainable development.
Isomerization of Raw Turpentine Using Various Combination of Strong and Weak Acid Catalyst for Eucalyptol Production
Authors: Elka Yudhatama Nicolaus , Almira Chairany Diva , Mufti Azis Muhammad , Indarto Antonius 
Published: April 2021

Abstract
There has been large interest to isomerize raw turpentine to produce a number of derivative products that has higher economic value. This process is often conducted using homogenous acid catalysts. Catalyst screening is often challenging to target a certain derivative product, such as cineole. The aim of present work is investigate various combination of strong and weak acid catalyst to obtain cineole. Strong acids used in this research were PTSA, hydrochloric acid, sulfuric acid. In addition, the weak acids were oxalic acid dihydrate, citric acid, and formic acid. Commercial turpentine was mixed with strong and weak acid with 4:1:6 ratio respectively, heated up to 85oC for 6 hours for each combination of strong and weak acid. The result from GC-MS analysis shows that combination of hydrochloric acid and formic acid gave the highest eucalyptol yield around 9.67% along with other valuable product such as camphene, limonene, and a-terpinolene.
Activity Test of CuO/γ-Al2O3 as Catalyst of Methanol Dehydration to Dimethyl Ether at Atmospheric Pressure
Authors: Susanto Edi , Ardy Aisyah , Susanto Herri 
Published: April 2021

Abstract
Dimethyl ether (DME) is already used as a propellant and intermediate chemicals. Now, Indonesia will use DME as alternative energy for Liquid Petroleum Gas (LPG), as a result of the continued increase in LPG imports. In this study, DME was synthesized by dehydration of methanol process. The y-Al2O3 and modified CuO/y-Al2O3 ITB use as catalysts for the process. The objective of this research was to compare of catalytic activity of two catalysts at methanol dehydration to DME. The catalyst activity test was carried out in a tubular fixed-bed reactor (ID 1 cm and length 21 cm). Methanol dehydration was carried out at 1 bar, GHSV 1,100-2,200/h, methanol 1.9-4 mL/h, N2 10-30 mL/min (27.5°C and 0.93 bar). The downstream gas of the reactor was analyzed using gas chromatography and the condensate was analyzed using a refractometer. The y-Al2O3-ITB catalyst gives the highest performance with 89.6% of methanol conversion, 6.6% of DME yield, and 16.6% of DME selectivity. Whereas CuO/y-Al2O3 catalyst has a lower performance by 85.5% of methanol conversion, 1.4% of DME yield, and 3.7% of DME selectivity.
Theoretical proposal for the experimental realisation of a monochromatic electromagnetic knot
Authors: Cameron R P , Löffler W , Stephan K D 
Published: April 2021

Abstract
We propose an antenna designed to generate monochromatic electromagnetic knots and other ‘unusual electromagnetic disturbances’ in the microwave domain. Our antenna is a spherical array of radiating dipolar elements configured to approximate the desired electromagnetic field near its centre. We show numerically that a specific embodiment of the antenna with a radius of 61.2 cm and only 20 element pairs driven at a frequency of 2.45 GHz can yield linked and torus-knotted electric and magnetic field lines approximating those of an ‘electromagnetic tangle’: a monochromatic electromagnetic knot closely related to the well-known Rañada–Hopf type electromagnetic knots but simpler in its construction. The antenna could be used to locally excite plasmas.
Antimicrobial and antioxidant properties of biosynthesized of NiO nanoparticles using Raphanus sativus (R. sativus) extract
Authors: Haq Sirajul , Dildar Sadaf , Ali Manel Ben , Mezni Amine , Hedfi Amor , Shahzad Muhammad Imran , Shahzad Nadia , Shah Amreen 
Published: April 2021

Abstract
The aim of this study was to explore the antibacterial and antioxidant efficacy of nickel oxide nanoparticles (NiO NPs). The Raphanus sativus (R. sativus) extract mediated NiO NPs were calcined at 100, 300, 600 and 900 ℃ in a muffle furnace for 3 h. The increased intensity of diffraction bands in the X-ray diffraction (XRD) spectrum suggest that the degree of crystallinity increases with increasing calcination temperature. The desired elements was depicted in the energy dispersive X-rays (EDX) spectrum confirm the purity of the NiO Sample. The variation in surface morphology and increase in the particles size from 12.78 to 51.42nm was determined from the transmission electron microscope (TEM) micrographs. The shift toward higher wavelength was observed in the diffuse reflectance spectroscopy (DRS) spectra with increasing calcination temperature, results into a clear decrease in band gap from 3.12 to 2.86 eV. The presence of hydroxyl group along with other organic moieties were confirm through Fourier transform infrared (FTIR) spectroscopy analysis. The biological potential of the calcined NiO NPs was examined during the antibacterial and antioxidant experiments. The antibacterial effect of NiO NPs was studied using the agar well diffusion process, and the ABTS free radical scavenging potential of NiO NPs was also assessed. The activity of NiO NPs calcined at 100 °C is greater than that of those calcined at higher temperatures.