bluuebunny/crossref_metadata_2025 huggingface dataset:
Homoeopathic Treatment as an Add-On for Minimizing After Effects of Conventionally Treated Cancer Patients: A Simple Randomized Pilot Study—Protocol from Northeast India Perspective
Authors: Sharma Pawan , Sharma Bindu , Aggarwal Tanya , Kalita Manoj
Published: June 2021

The north-eastern region of India accounts for a total of 37,448 cancer cases reported from 11 population-based cancer registries (PBCRs) from 2012 to 2014. Studies suggest that with the holistic approach adopted by homoeopathy, not only the symptoms like cancer pain are alleviated, but also the overall well-being of the patient. Homoeopathy can be beneficial to minimize the treatment-induced adverse effects like radiation-induced mucositis, skin reactions, postoperative seroma, bleeding, and complications associated with the use of surgery, chemotherapy, and radiation therapy. This study intends to provide homoeopathic services as an add-on to conventional treatment to the patients referred for homoeopathic treatment after their due consent. The primary objective is to study the usefulness of homoeopathic medicines for combating the suffering of cancer patients having complaints other than cancer. A sample size of 70 patients per group in two arms (Arm A: standard allopathic drug and Arm B: standard allopathic drug + homoeopathic treatment) will be recruited using simple random sampling without repetition. Cancer patients reporting complaints other than cancer itself and suffering from the after-effects of cancer treatment with chemotherapy and radiation therapy to any reputed cancer institute will be screened and will be recruited according to inclusion and exclusion criteria. After completion of the six months study duration, results will be able to predict the role of homoeopathic treatment as an add-on to conventionally treated cancer patients to minimize the suffering other than cancer and the after-effects of chemotherapy and radiation therapy. If found significant, this could prove to be a contribution in the health care system in handling cancer cases that are very difficult to treat. Further, the cost-effectiveness of homoeopathy will enable developing countries to manage such a disease effectively.
Health Information Exchange between Specialists and General Practitioners Benefits Rural Patients
Authors: Nakayama Masaharu , Inoue Ryusuke , Miyata Satoshi , Shimizu Hiroaki
Published: June 2021

Background Health information exchange (HIE) may improve diagnostic accuracy, treatment efficacy, and safety by providing treating physicians with expert advice. However, most previous studies on HIE have been observational in nature.

Objectives To examine whether collaboration between specialists and general practitioners (GPs) in rural areas via HIE can improve outcomes among patients at low-to-moderate risk of cardiovascular disease, kidney disease, and stroke.

Methods In this randomized controlled trial, the Miyagi Medical and Welfare Information Network was used for HIE. We evaluated the clinical data of 1,092 patients aged ≥65 years living in the rural areas of the Miyagi Prefecture and receiving care from GPs only. High-risk patients were immediately referred to specialists, whereas low-to-moderate risk patients were randomly assigned to an intervention group in which GPs were advised by specialists through HIE (n = 518, 38% male, mean age = 76 ± 7 years) or a control group in which GPs received no advice by specialists (n = 521, 39% male, mean age = 75 ± 7 years).

Results In the intention-to-treat analysis, all-cause mortality and cumulative incidence of serious adverse events (e.g., hospital admission or unexpected referral to specialists) did not differ between the groups. However, per-protocol analysis controlling for GP adherence with specialist recommendations revealed significantly reduced all-cause mortality (p = 0.04) and cumulative serious adverse event incidence (p = 0.04) in the intervention group compared with the control group.

Conclusion HIE systems may improve outcomes among low-to-moderate risk patients by promoting greater collaboration between specialists and GPs, particularly in rural areas with few local specialists.
Insights from a cross-sector review on how to conceptualise the quality of use of research evidence
Authors: Rickinson Mark , Cirkony Connie , Walsh Lucas , Gleeson Jo , Salisbury Mandy , Boaz Annette
Published: June 2021

Recent decades have seen widespread efforts to improve the generation and use of evidence across a number of sectors. Such efforts can be seen to raise important questions about how we understand not only the quality of evidence, but also the quality of its use. To date, though, there has been wide-ranging debate about the former, but very little dialogue about the latter. This paper focuses in on this question of how to conceptualise the quality of research evidence use. Drawing on a systematic review and narrative synthesis of 112 papers from health, social care, education and policy, it presents six initial principles for conceptualising quality use of research evidence. These concern taking account of: the role of practice-based expertise and evidence in context; the sector-specific conditions that support evidence use; how quality use develops and can be evaluated over time; the salient stages of the research use process; whether to focus on processes and/or outcomes of evidence use; and the scale or level of the use within a system. It is hoped that this paper will act as a stimulus for future conceptual and empirical work on this important, but under-researched, topic of quality of use.
Effect of insulator surface conditioning on the pinch dynamics and x-ray production of a Ne-filled dense plasma focus
Authors: Housley D. , Hahn E. N. , Narkis J. , Angus J. R. , Link A. J. , Conti F. , Beg F. N.
Published: June 2021

The dense plasma focus (DPF) can be an intense source of x rays, wherein the insulator sleeve strongly dictates the electrical breakdown, which subsequently affects the formation of a plasma sheath and a collapse phase. Experiments on a 25 kJ DPF (operated at 4.4 kJ) are carried out to demonstrate the influence of insulator surface morphology on the pinch structure, dynamics, and x-ray yield using a Ne fill. Two borosilicate insulators are directly compared, one with a smooth finish and the other machined with four circumferential grooves traversing the perimeter of the exterior insulator surface. Comparisons are made through same-shot imaging diagnostics of the evolving plasma sheath during breakdown, rundown, and at the pinch in addition to the time-resolved measurements of emitted x rays via filtered photodiodes. The presence of structures on the insulator sleeve reduces x-ray production across all fill pressures by a factor of 2.8 ± 2.4 on average and reduces the highest x ray producing shots by a factor of 5.5 ± 1.8. Observations of sheath asymmetry and inhomogeneity at lift-off are observed and correlated with subsequent observations of off-axis radial collapse. Taken together, this suggests that local variations in the insulator surface decrease the spatial uniformity of the sheath, leading to an azimuthally asymmetric focus, reduced electron densities, and, ultimately, degraded x-ray production.
Bouncing and coalescence dynamics during the impact of a falling drop with a sessile drop on different solid surfaces
Authors: Abouelsoud Mostafa , Bai Bofeng
Published: June 2021

The dynamic of an impacting drop with a sessile drop of the same liquid on different solid surfaces is investigated experimentally and theoretically. By controlling the surface wettability and the impact velocity, different regimes were observed, such as complete rebounding, direct coalescence, and coalescence during the retraction phase or the spreading phase. It is observed that the complete rebounding phenomenon has widely occurred during the impact on hydrophilic surfaces. In addition, both the maximum and minimum limits of coalescence/complete rebounding thresholds were determined. During the complete rebounding phenomena, and based on the energy balance, the maximum spreading diameter of the falling drop diameter on the sessile drop was proposed. In addition, the restitution coefficient and the contact time between the falling and sessile drops were studied experimentally, and theoretically, the models show a good agreement with the experimental work.
Near-wall flow structures and related surface quantities in wall-bounded turbulence
Authors: Chen Tao , Liu Tianshu , Dong Zhi-Qiang , Wang Lian-Ping , Chen Shiyi
Published: June 2021

By applying the Taylor-series expansion solution of the Navier–Stokes equations, an analysis is given to elucidate the relationships between near-wall flow structures and the fundamental surface quantities (skin friction and surface pressure). The derived results are used to understand the physical features of near-wall flow structures around a typical strong wall-normal velocity event (SWNVE) in a turbulent channel flow based on the direct numerical simulation data at Reτ=180. The simulation is carefully done using a multiple-relaxation-time lattice Boltzmann method combined with an improved on-wall bounce-back implementation. It is found that both the skin friction divergence and the Laplacian of surface pressure have good correspondence with sweep and ejection motions induced by the quasi-streamwise vortex above the viscous sublayer. Interestingly, the surface pressure variation induced by a quasi-streamwise vortex tends to attenuate the wall-normal velocity magnitude in both the sweep and ejection sides through the Laplacian of surface pressure. Similar physical effects of surface-pressure-related terms are also observed for the near-wall Reynolds stress. The concentrated enstrophy and dissipation are associated with the SWNVE and high skin friction magnitude. It is found that the SWNVE is dynamically important in generating the boundary enstrophy flux, greatly enhancing the intermittency of turbulence inside the viscous sublayer. In addition, by applying the methods of differential geometry, the near-wall Taylor-series expansions are generalized for a stationary curved surface in a general curvilinear coordinate system. The generalized results could be useful in evaluating the curvature effect in the near-wall region for complex flows.
Numerical simulation regarding flow-induced noise in variable cross-section pipelines based on large eddy simulations and Ffowcs Williams–Hawkings methods
Authors: Sun Lihui , Zhe Chuntian , Guo Chang , Cheng Shen , He Suoying , Gao Ming
Published: June 2021

Large eddy simulations and Ffowcs Williams–Hawkings acoustic analogy methods have been adopted to simulate the flow-induced noise for variable cross-section pipelines under variable flow velocity conditions in this paper, and the main influencing factors of flow-induced noise are analyzed numerically, including the flow velocity and variable diameter angle. Results manifested that the flow field distribution, sound source characteristics, and frequency spectrum characteristics of the sound pressure level (SPL) at different flow velocities follow similar trends. The average acoustic source intensity increases gradually with the increase in flow velocity. The maximum of the acoustic source intensity is located near the outlet of the variable diameter angle due to the vortex effect. The flow-induced noise in variable cross-section pipelines is mainly low-frequency noise, and its energy is mainly concentrated below 200 Hz according to the frequency spectrum characteristics. Additionally, the SPL increases with the increase in flow velocity. Compared with v = 1 m/s, the SPL at v = 2 m/s and v = 3 m/s increases by 9.4% and 22.1%, respectively. In addition, there is an approximate linearly increasing relationship between the SPL and the variable diameter angle. The minimum of the SPL appears at φ = 15.2°, and the maximum appears at φ = 25.7° at different flow velocities, which is up to 70.18 dB. Briefly, the flow-induced noise characteristics, including the average acoustic source intensity, the SPL, and the frequency spectra, are revealed in this paper. This provides a theoretical basis for the optimization of variable cross-section piping systems and the investigation of flow-induced noise control techniques.
Phenyl argentate aggregates [AgnPhn+1]− (n = 2–8): Models for the self-assembly of atom-precise polynuclear organometallics
Authors: Daly Steven , Weske Sebastian , Mravak Antonija , Krstić Marjan , Kulesza Alexander , Antoine Rodolphe , Bonačić-Koutecký Vlasta , Dugourd Philippe , Koszinowski Konrad , O’Hair Richard A. J.
Published: June 2021

Electrospray ionization of phenyl argentates formed by transmetalation reactions between phenyl lithium and silver cyanide provides access to the argentate aggregates, [AgnPhn+1]−, which were individually mass-selected for n = 2–8 in order to generate their gas-phase Ultraviolet Photodissociation (UVPD) “action” spectra over the range 304–399 nm. A strong bathochromic shift in optical spectra was observed with increasing size/n. Theoretical calculations allowed the assignment of the experimental UVPD spectra to specific isomer(s) and provided crucial insights into the transition from the 2D to 3D structure of the metallic component with the increasing size of the complex. The [AgnPhn+1]− aggregates contain neither pronounced metallic cluster properties nor ligated metallic cluster features and are thus not superatom complexes. They therefore represent novel organometallic characteristics built from Ag2Ph subunits.
Martensitic transformations of β-phase in zirconium
Authors: Gandi Appala Naidu , Zhu Jiajie
Published: June 2021

Martensitic transformations in the body-centered cubic β-phase (Im3¯m) of zirconium are studied using first-principles calculations, group-theoretical methods, and symmetry analysis. Phonon dispersion relations in the β-phase calculated within the harmonic approximation predicted an unstable phonon at wave vector 2πa[12,12,0](N) and a soft phonon at wave vector 2πa[23,23,23](Λ). The symmetry of the unstable phonon is the same as the symmetry of the N4− irreducible representation, and the symmetry of the soft phonon is the same as the symmetry of the Λ1 irreducible representation. Martensitic transformations are simulated considering two steps. Frozen phonon calculations are used to determine the first step, i.e., the transformation of the β-phase to an intermediate phase due to phonon motion. Structure relaxation is used to determine the second step, i.e., the transformation of the intermediate phase to the final phase. The unstable N4− phonon transforms the β-phase into an intermediate orthorhombic phase (Cmcm), which further transforms to a hexagonal close packed α-phase (P63/mmc) after structure relaxation. The soft Λ1 phonon transforms the β-phase into an intermediate trigonal phase (P3¯m1), which further transforms to a hexagonal close packed ω-phase (P6/mmm) after structure relaxation. The intermediate phase space group (Cmcm/P3¯m1) is a common subgroup of the parent phase (β) space group and the final phase (α/ω) space group. Therefore, the martensitic transformations in zirconium are reconstructive transformations of the second kind. Symmetry characterization of the martensitic transformations is also presented.
Accurate exploration of synergistic thermal effect: Low-grade-heat-promoted charge recombination coupled with spherical incidence for efficient sunlight-driven photocatalysis
Authors: Xiang Houkui , Wang Zhijian , Chen Jiazang
Published: June 2021

The major objective of the emerging photo-thermo-catalysis is using waste heat to boost the photocatalytic reaction, especially that powered by sunlight. Because of the complex composition of light-intensity-dependent apparent activation energies, the issue that principally hinders the synergistic thermal effect to photocatalysis has hardly been accurately explored. In this work, by virtue of mutual match of theoretical simulation and experimental behaviors, we demonstrate that photocatalytic reaction rates exhibit a sensitively positive correlation with temperature under weak illumination, in which charge recombination predominates the rate-determining step of semiconductor–cocatalyst interfacial electron transfer. Under high-intensity irradiation, however, the aggravation of charge leakage inherently accompanied by thermionic emission severely weakens the synergistic thermal effect or even slows down the reaction by raising the temperature. Inspired by these, we manage to maximize the photocatalytic solar utilization by spherical incidence of sunlight with the assistance of low-grade heat.
Aligned Carbon Nanotube Films for Immobilization of Glucose Oxidase and its Application in Glucose Biosensor
Authors: Jiang Chunbo , Zheng Lianxi , Liu Yang
Published: June 2021

Glucose oxidase (GOx) was immobilized between aligned carbon nanotube films (ACNTFs) using a cross-stacking method without any purification and functionalization processes. Direct electron transfer of GOx was achieved on the ACNTFs with reversible redox peaks observed at the formal potential of –0.448 V. When applied to the determination of glucose by cyclic voltammetry, the prepared enzymatic electrode exhibited a linear range from 1 to 5 mM under mediator-free physiological conditions, which makes it a promising candidate for the development of third-generation glucose biosensors.
Characterizing public perceptions of social and cultural impacts in policy decisions
Authors: Dieckmann Nathan F. , Gregory Robin , Satterfield Terre , Mayorga Marcus , Slovic Paul
Published: June 2021

Significance

Large infrastructure projects such as highways, pipelines, and ports undergo formal impact evaluations to assess the likely impacts to social and cultural priorities, the economy, public health, and the environment. Several scientific and citizen groups have expressed concern that social and cultural impacts are not given sufficient consideration as compared to more tangible impacts such as economic concerns. In two large surveys, we find that the public does differentiate impacts, using qualities such as tangibility and scope, and we provide evidence supporting the widespread public perception that many policy decisions fail to reflect concerns about a range of social and cultural impacts. Knowing more about public perceptions of impacts could help aid the development of more equitable impact assessment procedures.
Enhancing stationary entanglement between two optomechanical oscillators by Coulomb interaction with Kerr medium*
Authors: Yang Tian-Le , Zhu Chen-Long , Liu Sheng , Xu Ye-Jun
Published: June 2021

We theoretically study the stationary entanglement of two charged nanomechanical oscillators coupling via Coulomb interaction in an optomechanical system with an additional Kerr medium. We show that the degree of entanglementbetween two nanomechanical oscillators is suppressed by Kerr interaction dueto photon blockade and enhanced by Coulomb coupling strength. We also show other parameters for adjusting and obtaining entanglement, such as the driving power and the frequencies of the two oscillators, and the entanglement is robust against temperature. Our study proves a way for adjusting stationary entanglement between two optomechanical oscillators by Coulomb interaction and Kerr medium.
Geometric structure of N2O
q+ (q = 5, 6) studied by Ne8+ ion-induced Coulomb explosion imaging*
Authors: Zhao Xi , Shan Xu , Zhu Xiaolong , Chen Lei , Shen Zhenjie , Feng Wentian , Guo Dalong , Zhao Dongmei , Zhang Ruitian , Gao Yong , Huang Zhongkui , Zhang Shaofeng , Ma Xinwen , Chen Xiangjun
Published: June 2021

We report the study on the complete three-body Coulomb explosion (CE) of N2O
q+ (q = 5, 6) induced by 56-keV/u Ne8+ ion collision with N2O gaseous molecule. Six CE channels for N2O5+ and seven for N2O6+ are identified by measuring three ionic fragments and the charge-changed projectile in quadruple coincidence. Correspondingly the kinetic energy release (KER) and momentum correlation angle (MCA) distributions of three ionic fragments for each of the CE channels are also deduced. Numerical computation is presented to reconstruct the geometric structure of N2O
q+ prior to dissociation based on the measured KER and MCA. The N–N and N–O bond lengths and the N–N–O bond angles of N2O
q+ for each of the channels are determined.
The Railway Detection via Adaptive Multi-scale Fusion Processing
Authors: Peng Qian , Ren Shiwei , Wang Weijiang , Shi Yueting
Published: June 2021

One of the main problems for safe autonomous driving vehicles that have not been solved completely is the high-precision and timely lane detection. In this work, we present a novel operator for railway detection to settle these tasks based on lane detection for the first time, called adaptive multi-scale fusion Sobel operators. The new operators can eliminate the noises generated by the environment in the railway image and derive more integrated edge feature information from the 0°, 45°, 90°, and 135° detection via 4 matrixes of 3 * 3 operators for permutation and summation. The image processing for railway detection includes the preprocess for images, railway edge detection, and track line polynomial fitting. Our experiment has validated that this improved detection method has realized the high accuracy and efficiency for rail detection. The dynamic rail detection and identification in the video of the railway track prove that this method has a significant effect on the left and right curved railway detection. It has good robustness and applicability.
Temperature Experiment and Compensation Algorithm Design for Fiber Gyros in Rapid Startup Inertial Navigation System
Authors: Zhuo Chao , He Jinyang , Hao Rui , Ren Lei
Published: June 2021

This article describes a practical thermal experiment and compensation algorithm for fiber gyros in an inertial navigation system with a rapid startup and short time operation characteristic. Multi-position cold startup experiments at discrete temperature points is designed to fully stimulate the thermal error mode. And due to the nonlinear characteristic of the error, a piecewise spline algorithm is applied to precisely identify and build the error model. After the compensation, the gyro instability in the full temperature range is reduced from the level of 5 °/h to better than 1 °/h.
Experimental study on robotic rotary ultrasonic drilling of CFRP/aluminum stacks
Authors: Dong Song , Meng Dan , Zheng Kan , Liao Wenhe
Published: June 2021

In order to solve the problem of significant chatter vibration and large drilling force when drilling stacked materials by industrial robot, a new method is proposed. It combines rotary ultrasonic drilling with robotic machining to achieve high efficiency and low damage for CFRP/aluminum stacks. In this paper, comparative experiments of robotic rotary ultrasonic drilling (RRUD) and robotic conventional drilling (RCD) on drilling CFRP/aluminum stacks are carried out in a KUKA six-axis industrial robot. Drilling force, drilling chatter and aperture deviation are measured and analyzed. The experimental results illustrate that high-frequency vibration can not only reduce drilling force effectively, but also have a good inhibitory effect on robotic drilling flutter. In addition, the improvement effect of ultrasonic vibration on aperture deviation for CFRP is more significant than that for aluminium.
Design and analysis of a single adjustable damping force robotic leg working with magnetorheological technology
Authors: Jiang Yifan , Li Qimin , An Zijian
Published: June 2021

Aiming at the problems of leg’s huge impact faced by legged robot in running movements, an adjustable damping force robotic leg working with magnetorheological technology was designed. The mechanism of how the magnetorheological damper adjusts the damping force of the robotic leg is analyzed. Based on SLIP model, the dynamic of the robotic leg was established. With Foot contact force, the displacement of the hip joint in the vertical direction and the loss of leg’s energy as the optimization objectives, the optimal damping force at different velocity was obtained by weight optimization algorithm, and the curve of the optimal damping force of the leg varying with the speed of the body is fitted. The cushioning capacity of the leg was simulated and verified at a speed of 4 meters per second, and the results showed that the structure with adjustable damping force meet the requirements of high cushion performance in running movements.
Analysis of Technical Performance of PSS2 Based on An Active Power Oscillation Accident of generator
Authors: Zhang Guangtao , Liang Hao , Xie Huan , Wu Tao , Shi Yang , Zhao Yan , Yan Yian , Guo Zhifeng , Guo Jian , Liu Lili , Tan Qibang
Published: June 2021

Low frequency oscillation in power system has become the main factor limited the development of power grid in China. Taking the generator power oscillation accident caused by PSS abnormal operation in a gas power plant of China as an example, the accident process is introduced in detail, and the causes of the accident are preliminarily discussed through the analysis of related data. The generator model is established with RTDS platform, then the influences of the rotational inertia, and speed acquisition methods of the unit and setting of the swing reactance on generator PSS(Power System Stabilizer) suppressing power oscillation effect are simulated and analyzed. According to the research results, the accident causes are further analyzed, and relevant suggestions are given for how to avoid such accidents.
Island Charging Concept in Archipelago of Indonesia
Authors: Sijabat L H , Setiawan E A
Published: June 2021

Indonesia’s archipelago country has enormous diversity, and potential for renewable energy (solar and wind energy), one of which is located on Timor Island, East Nusa Tenggara Province, but the need to use energy is still minimal. This is due to the lack of welfare of the population, which results in low energy production. Here is a great opportunity for Timor Island to become a new force in developing renewable energy in an archipelago as island charging, which is even the largest in the world. Island charging is expected to increase economic growth for the region by creating new benefits for the islands around Timor Island, which have a wealth of natural resources by supplying the energy needs of the mining industry such as those on Wetar Island, Maluku Province. End of this concept’s is the Levelized Cost of Storage (LCOS) on the Mobile Energy Storage System (MESS), which is influenced by both land and sea modes of transportation.
A New DC Microgrid Voltage Regulation Control Strategy for Photovoltaic Power Plant Based on Variable Power Reserve Level
Authors: Hu Pengtao , Gong Ping , Zhua Yongqiang , Xia Ruihua
Published: June 2021

With the gradual increase of photovoltaic power penetration, in order to ensure the voltage quality of DC micro-grid, photovoltaic power plants need to be able to participate in voltage regulation tasks to cope with the impact of photovoltaic power fluctuations and load fluctuations on voltage quality. Researches show photovoltaic power plants under load-reduction operation can participate in voltage regulation without using energy storage equipment. In this paper, a photovoltaic voltage regulation control strategy with variable load-reduction rate considering photovoltaic power fluctuation is proposed, which can change the load-reduction rate of photovoltaic plants according to the fluctuation of photovoltaic. Then, aiming at the problem of fast voltage change caused by small inertia time constant of DC micro-grid, the method of using photovoltaic backup capacity to provide inertia control for the system is adopted, so that photovoltaic power plants can cope with both photovoltaic fluctuation and load fluctuation at the same time. Finally, a simulation model is established in PSCAD/EMTDC. Simulation results verify that under the proposed control strategy, grid-connected converters for the PV can participate in the DC voltage regulation.
Design of DC motor position tracking system based on LQR
Authors: Xiang Zhengrong , Wei Wenbin
Published: June 2021

In order to realize the accurate tracking of the desired position by the DC motor position tracking system, a control method of the DC motor position tracking system based on LQR was proposed. Based on the modeling of the DC motor position tracking system, the stability, controllability and observability of the system are analyzed. Then, the LQR optimal control theory and the design process of the controller are introduced, and the output angular position of the DC motor is taken as the control object, and several common control methods are compared with the controller algorithm designed in this paper through MATLAB software. Experimental results show that the designed controller algorithm can track the desired position, and the system also has the characteristics of short adjustment time, small overshoot and high tracking accuracy.
Reinforced concrete beams subjected to three-point bending using finite element method
Authors: Afanador García N , Guerrero Gómez G , Nolasco Serna C
Published: June 2021

Buildings are generally composed of reinforced concrete elements and understanding the response of these elements to the actions to which they are subjected is crucial for the design of a feasible, safe, and economic structure. This paper analyzes 3D finite element modeling using the commercial software ANSYS for a reinforced concrete beam subjected to three-point bending, simply supported with a doubly reinforced cross-section and transverse reinforcement. This work validated the results of a numerical model with theoretical results for a reinforced concrete beam subjected to monotonic loading. This work was carried out for the civil engineering program of Universidad Francisco de Paula Santander, Ocaña, Colombia, in order to reduce student attrition, increase motivation, and broaden the professional skills of future graduates.
Study of factors affecting hardness behavior of biopolymers based on potato and plantain peels: a factorial experimental evaluation
Authors: Castro H F , Farfán H I , Abril I V , Paredes R A , Roa K L
Published: June 2021

The environmental impact caused by generation of plastic wastes at a global level is significant, during the last year, production of plastic increased by 40% due to the Covid-19 pandemic, demanding in an accelerated way the massive use of disposable personal protection elements. This situation has changed drastically the pattern of human behavior, introducing a lifestyle with greater hygiene that makes necessary to use plastic packaging to cover products, utensils, and food, avoiding any risk of transmission. To combat the massive use of plastic it is necessary to activate the transition towards circular economies that make use of environmentally friendly plastics; this is the case of biopolymers, materials that can be synthesized from organic waste rich in starch. Therefore, in this work, the factors that affect the hardness of polymers made from potato and plantain peels are studied through a factorial experimental design. The design establishes the combination of urea, glycerine, acetic acid, and water, to identify the best combination of plasticizer and their effect on the hardness of the material. Using Minitab, the multivariate linear models of hardness behavior were assessed to achieve the highest hardness values.
A RSTUDIO-based modeling program for dispersion of particulate matter emissions using Gaussian plume equation
Authors: Silveira A G , Maués C S , Guimarães C S
Published: June 2021

Mathematical models allow evaluating the air pollutants effects to the environment under several conditions, being a relevant and a low-cost tool for planning and regulatory purposes. Recent studies have shown the effects of particulate matter on environment and human health, especially cardiovascular and respiratory diseases. This study aims to evaluate the air quality of Volta Redonda, Brazil, due to particulate matter emitted by stationary point sources of a steel industry using meteorological data from three monitoring stations. A mathematical model was developed RStudio®, using the Gaussian dispersion equation and Google Maps API to visualize the results. Davidson-Bryant plume rise equation was included. Observed data revealed southeastern, southeastern, northern and eastern light prevailing winds that were used to simulate particulate matter concentrations for 24-hour periods, under stable and unstable conditions according Pasquill-Guifford classification. The results show that the stations exceed the daily standards determined by the legislation in different scenarios, with Santa Cecília station, being the one that violated these standards the most, reaching an average daily value of 3673.04 µgm -3, with an hourly peak of 7712.76 µgm -3, for the scenario of prevailing northwest winds and wind speed of 1 ms -1. Other stations also violated the standards, with the Retiro station showing better results for the north and northwest wind directions.
Modeling and simulation of an improvement proposal through the method mechanized transplanting
Authors: Orjuela Abril M S , Trujillo Toscano L E , Pabón León J A
Published: June 2021

Rice agriculture in Colombia has high costs and low profitability, compared to rice agriculture in leading countries that are supported in different ways by their governments worldwide. Part of these high costs is due to the deficient technification of the processes, the absence of standardized procedures and the farmers’ lack of resources. This article develops modeling and simulation of the implementation of the indirect seeding method by mechanized transplanting; these results are obtained through the study and definition of technologies for the cultivation method, the description of the process, machinery, equipment, and inputs, which determined the necessary capacity of the production plant through modeling and simulation in software Flexsim. Rice cultivation is one of the main incomes of countries with high population density and poor economy, alternatives and improvement actions are of great importance for the growth of the sector. As a result, there is evidence of improved crop productivity, better water consumption efficiencies by physical analysis (comparison of traditional and technician water consumption) and the necessary capacity of a production plant from harvesting to final packaging.
Software to build dynamical systems models from time series with chaotic behavior
Authors: Cruz J L , Gutiérrez R M , Pastrán C G
Published: June 2021

In physics and other sciences there are dynamic systems that exhibit chaotic behavior. Understanding and predicting the behavior of these systems depends on the ability to build models of them. That is why software written in the python language is being developed that allows us to experiment numerically in an agile and precise way with different models of the dynamics of a time series that presents chaotic behavior. This software has a graphical interface divided into three sections. The first section has tools that allow you to interact with the built models. The second section has tools that allow you to establish whether a time series can exhibit chaotic behavior. The third section has tools that allow models to be built from time series. Finally, using the Lorenz system, an example of the use and utility of this software for the construction of models from time series and its possible usefulness in real data is presented.
Curricula framework for a digital transformation master’s in science and engineering
Authors: Vera-Contreras M J , Vera-Rivera F H , Puerto-Cuadros E G
Published: June 2021

Digital transformation is an interdisciplinary work that has the objective to analyze data in real-time for better decision making, where it involves the modeling and the simulation of physical-mathematical and social processes and the monitoring of machinery that using information and communication technologies. Nowadays the fourth industrial revolution technologies are the driver for this transformation and soon will be quantum computing and other physics and mathematics advances. Therefore, in this academic-scientific work, a curricular framework is proposed for a master’s program in digital transformation for science and engineering; the framework follows the literature review and analysis to formulate the denomination and justification for the master’s degree. The results are (i) a general three-level model as a roadmap for the specific curricular design of a master’s in digital transformation for science and engineering; (ii) the recommendation that a master’s program has a research focus in the two categories established by the Colombian standard (research and practitioner); (ii) finally, a political, economic, social, technological, environmental, and legal analysis justifies a master’s in digital transformation for science and engineering. The research model details the phases that were carried out to characterize and identify the curriculum framework that will be the basis for formalizing the master’s degree document.
Design and research on the adsorption system for self-regulating unmanned cleaning aircraft
Authors: Li Wei , Xie Jiali , Liang Yuan , Yue Shaowu , Lei Yao
Published: June 2021

Cleaning robot is one of the main research directions in the field of glass curtain wall cleaning at present. It has important theoretical research significance and practical application value in high altitude work tasks such as glass curtain wall cleaning and crack detection. At present, cleaning robots are prone to reduce their working stability due to the dynamic uncertainty of the high-altitude wind field environment, and even fall from the sky in serious cases, which greatly affects the safety of high-altitude operation. Therefore, an adsorption system applied to unmanned cleaning aircraft is proposed in this paper. The system has two advantages: (1) through the adjustment of the center controller, the system can be detected in dynamic environment according to the parameters change, the influence of adsorption force to adjust output parameters, the corresponding mechanism, control the automatic adjusting system surface adsorption, are keeping their reasonable adsorption range, thus ensuring the system stability; (2) When the adsorption force adjustment parameter exceeds the adjustment threshold, the system will automatically start the motor to make the rotor work and prevent the cleaning equipment from falling, so as to improve the safety performance of the system.
Design of intelligent throwing robot based on machine vision
Authors: Gong Fan , Zhang Yu Mu
Published: June 2021

Absrtact: An intelligent robot system integrating motion, machine vision and throwing function is designed. The system uses STM32 as the main control chip, realizes the motion control of the robot through mcnaum wheel, completes the image acquisition, recognition and processing of the robot with openmv machine vision module, and realizes the throwing function control of the robot through steering gear and motor. The intelligent throwing robot can recognize and grasp the ball of the corresponding color according to the functional requirements, move to the throwing area of the specified color, and complete the fixed-point throwing of the ball. Through the experimental debugging, the results of the intelligent throwing robot based on the design meet the expected requirements.
Research on Electrical Contact Characteristics of Interference Fit Armature Based on Simulation
Authors: Du Xiang-yu , Liu Shao-wei
Published: June 2021

The electrical contact characteristics between the armature and the rail directly affect the current distribution on the armature and the rail during the launch process, which in turn affects key characteristics such as the thrust of the launcher and the distribution of Joule heat. In this paper, based on the Cooper-Mikic-Yovanovich contact theory, the electrical contact characteristics of the quadrupole electromagnetic orbit launcher under the interference fit condition are simulated, and the simulation results closer to the real current distribution are obtained. Based on the results, the electromagnetic characteristics of the launcher are analyzed. An analysis is carried out and it is pointed out that compared with ideal contact conditions, factors such as contact surface roughness will affect the electrical contact efficiency, which in turn affects the electromagnetic thrust and Joule heating of the launcher.
Building Elevator Safety Monitoring System Based on the BIM Technology
Authors: An Ziliang , Bai Dingsong , Huang Yuxin , Ning Wang , Deng Yuji , Gan Ningli , Liu Shaofeng
Published: June 2021

There are many problems in traditional elevator industry, such as, poor maintenance, unclear elevator operation information and single supervision platform. In this paper, a smart elevator management system based on “BIM + IOT” is proposed. This system combines BIM Technology, Internet technology, embedded technology and software management technology with elevator intelligent management system. It realizes the video monitoring of the whole equipment, equipment status monitoring, multi-party joint rescue and multiplatform information sharing of Government, Enterprise, Property and Maintenance. The system is composed of hardware and software, which realizes the functional coupling between elevator safety and intelligent building, and provides a research direction for Intelligent Building.
Model and Optimization of Low-Frequency Sound Absorption Performance of Multilayer Microperforated Panel Absorber
Authors: Yang Fei , Shen Xinmin , Wang Qiang , Zhang Xiaonan , Duan Haiqin
Published: June 2021

Optimization of the low-frequency sound absorption performance of the multilayer microperforated panel (MPP) absorber is favourable to promote its practical application in the noise reduction. Theoretical model of the multilayer MPP absorber was constructed based on the Maa’s theory for the further optimization. For target frequency range of 100-500Hz, parameters of the multilayer MPP absorbers with layer number of 1 to 4 were optimized through the cuckoo search algorithm according to the certain optimization objectives and the constraint conditions. Judging from the achieved optimal structural parameters for the multilayer MPP absorber with the target frequency ranges and the corresponding average sound absorption coefficients, it could be concluded that the parameter optimization was not only effective, but also be quite necessary. Meanwhile, it could be seen that average sound absorption coefficients of the optimal multilayer MPP absorbers decreased gradually along with increase of the layer number from 1 to 4. Through the optimization of structural parameters of the multilayer MPP absorbers, not only the sound absorption performance could be improved, but also the fabrication cost could be reduced. The research results exhibited outstanding low-frequency absorption performance, and it would be favourable to promote their practical applications to reduce the industrial noise in urban area.
Selection and Analysis of Dual-motor Coupling Device Based on Efficiency Power
Authors: Shuyuan Li , Mengnan Liu , Liyou Xu
Published: June 2021

In response to the needs of electric tractors under multiple operating conditions, a dual-motor power coupling drive system is matched. According to its power transmission requirements, a dual planetary gear train dynamic coupling structure scheme and a multi-planetary gear train dynamic coupling structure scheme are proposed. Through example design, the specific parameters of the two schemes are obtained. The transmission efficiency formulas of the two schemes in multiple modes are deduced, the transmission efficiency in each mode is calculated, and the final transmission scheme of the dual-motor power coupling device is optimized based on the transmission efficiency. It provides a theoretical basis and method for the design and analysis of the tractor power coupling device.
Shape analysis and numerical fitting of boneless wiper reed
Authors: Yunpeng Liu , Jingjing Xu , Xin Wang
Published: June 2021

The boneless reed curve of the car wiper has geometric nonlinearity and variable curvature characteristics. In order to design a geometric curve that satisfies the working performance of the boneless wiper reed, the inverse solution function item in the finite element simulation and the addition of appropriate boundary conditions are used to solve the geometric curve of boneless wiper reed before it is stressed, and verify the accuracy through the known actual reed. To prepare for actual processing, the geometric characteristic parameters of different curves are extracted on the basis of the above. Based on the small deformation linear deflection equation of the beam obtained by the superposition method, a large deformation correction item is added to correct the small deformation equation, and the influence of the length of the wiper buckle on the curve is considered. Construct a correction equation including load requirements, reed geometric dimensions, and material parameters to fit the geometric curve of the boneless wiper reed, so as to provide certain guidance for actual production.
Structural Performance of Subway Aluminum Alloy Car Body Analyzed by Abaqus Software
Authors: Wang Ning , An Ziliang , Bai Dingsong , Liu Shaofeng , Yu Xintong
Published: June 2021

In accordance with the structural performance shortages of the lightweight subway, the verification of the strength and stiffness of subway vehicles is proposed. Then the load combination conditions are divided into 9 operating conditions based on EN12663-2010. With the aid of Abaqus software, the strength and stiffness are judged whether it is qualified. The experimental results show that the aluminum alloy car body structure of Shanghai Line 16 can meet EN12663 and TB/T1335. In this paper, it provides a verification process for the reliability of the strength and stiffness of subway aluminum alloy car body.
The Enlightenment on Prediction and Health Management Technology of Elevator System
Authors: An Ziliang , Bai Dingsong , Gan Ningli , Wang Ning , Deng Jiyu , Huang Yuxin
Published: June 2021

In China, the research on detection technology of elevator fault is relatively late, and most of the technologies are only in the research of theoretical stage and have not yet been tested by practical applications. Organize and summarize the relevant literature and personal research. The research status of fault diagnosis, Prediction and Health Management technology at home and abroad is summarized. And the latest research of elevator fault prediction and health management technology is analysed. Finally, the challenges and the development trend of elevator fault health management are expounded.
Discussion on Industrial Internet Platform Construction Based on Power Internet of Things
Authors: Wang Yao , Liu Weiliang , Zhou Jianqi , Liang Yun
Published: June 2021

At present, the development of industrial Internet platform is in a period of large-scale expansion. Since 2017, China has issued a series of documents, such as the Guidance on Deepening “Internet + Advanced Manufacturing” to Develop Industrial Internet, the Action Plan for Industrial Internet Development (2018-2020), and the Industrial Internet App Cultivation Project (2018-2020), which constantly points out the direction for the development of the industrial Internet industry. The power Internet of Things connects the equipment, customers and data in all links of energy production, transmission and consumption in real time, fully bearing the production and operation of power grid, enterprise management and new business development, etc. It has the characteristics of ubiquitous terminal access, open platform sharing, computing cloud collaboration, convenient and flexible application, etc. This paper aims to discuss how the power Internet of Things can help the construction of the industrial Internet, provide strong data resource support and service for the safe and economic operation of the power grid, improve business performance, improve service quality, cultivate and develop strategic emerging industries, and open up a new road for management innovation, business innovation and value creation.