bluuebunny/crossref_metadata_2025 huggingface dataset:
Multi-modal artificial dura for simultaneous large-scale optical access and large-scale electrophysiology in non-human primate cortex
Authors: Griggs Devon J , Khateeb Karam , Zhou Jasmine , Liu Teng , Wang Ruikang , Yazdan-Shahmorad Azadeh
Published: March 2021

Objective. Non-human primates (NHPs) are critical for development of translational neural technologies because of their neurological and neuroanatomical similarities to humans. Large-scale neural interfaces in NHPs with multiple modalities for stimulation and data collection poise us to unveil network-scale dynamics of both healthy and unhealthy neural systems. We aim to develop a large-scale multi-modal interface for NHPs for the purpose of studying large-scale neural phenomena including neural disease, damage, and recovery. Approach. We present a multi-modal artificial dura (MMAD) composed of flexible conductive traces printed into transparent medical grade polymer. Our MMAD provides simultaneous neurophysiological recordings and optical access to large areas of the cortex (∼3 cm2) and is designed to mitigate photo-induced electrical artifacts. The MMAD is the centerpiece of the interfaces we have designed to support electrocorticographic recording and stimulation, cortical imaging, and optogenetic experiments, all at the large-scales afforded by the brains of NHPs. We performed electrical and optical experiments bench-side and in vivo with macaques to validate the utility of our MMAD. Main results. Using our MMAD we present large-scale electrocorticography from sensorimotor cortex of three macaques. Furthermore, we validated surface electrical stimulation in one of our animals. Our bench-side testing showed up to 90% reduction of photo-induced artifacts with our MMAD. The transparency of our MMAD was confirmed both via bench-side testing (87% transmittance) and via in vivo imaging of blood flow from the underlying microvasculature using optical coherence tomography angiography. Significance. Our results indicate that our MMAD supports large-scale electrocorticography, large-scale cortical imaging, and, by extension, large-scale optical stimulation. The MMAD prepares the way for both acute and long-term chronic experiments with complimentary data collection and stimulation modalities. When paired with the complex behaviors and cognitive abilities of NHPs, these assets prepare us to study large-scale neural phenomena including neural disease, damage, and recovery.
Deep learning for robust detection of interictal epileptiform discharges
Authors: Geng David , Alkhachroum Ayham , Melo Bicchi Manuel A , Jagid Jonathan R , Cajigas Iahn , Chen Zhe Sage
Published: March 2021

Objective. Automatic detection of interictal epileptiform discharges (IEDs, short as ‘spikes’) from an epileptic brain can help predict seizure recurrence and support the diagnosis of epilepsy. Developing fast, reliable and robust detection methods for IEDs based on scalp or intracranial electroencephalogram (iEEG) may facilitate online seizure monitoring and closed-loop neurostimulation. Approach. We developed a new deep learning approach, which employs a long short-term memory network architecture (‘IEDnet’) and an auxiliary classifier generative adversarial network (AC-GAN), to train on both expert-annotated and augmented spike events from iEEG recordings of epilepsy patients. We validated our IEDnet with two real-world iEEG datasets, and compared IEDnet with the support vector machine (SVM) and random forest (RF) classifiers on their detection performances. Main results. IEDnet achieved excellent cross-validated detection performances in terms of both sensitivity and specificity, and outperformed SVM and RF. Synthetic spike samples augmented by AC-GAN further improved the detection performance. In addition, the performance of IEDnet was robust with respect to the sampling frequency and noise. Furthermore, we demonstrated the cross-institutional generalization ability of IEDnet while testing between two datasets. Significance. IEDnet achieves excellent detection performances in identifying interictal spikes. AC-GAN can produce augmented iEEG samples to improve supervised deep learning.
Plasma steering to avoid disruptions in ITER and tokamak power plants
Authors: Boozer Allen H.
Published: March 2021

Steering tokamak plasmas is commonly viewed as a way to avoid disruptions and runaway electrons. Plasma steering sounds as safe as driving to work but will be shown to more closely resemble driving at high speed through a dense fog on an icy road. The long time required to terminate an ITER discharge compared to time over which dangers can be foreseen is analogous to driving in a dense fog. The difficulty of regaining plasma control if it is lost resembles driving on an icy road. Disruptions and runaways are associated with three issues—a solution to one tends to complicate the solution to the other two: loss of plasma position control, excessive heat deposition, and wall melting due to runaway electrons. All three risks must be addressed for ITER to achieve its mission and essentially eliminated before tokamak power plants can be deployed.
MEMS-based electric field sensor with environmental adaptability consideration and its application in the near-ground atmosphere
Authors: Xiaolong WEN , Yang Pengfei , Zhaozhi CHU , Peng Chunrong , Yutao LIU , Shuang WU
Published: March 2021

The near-ground electric field (E-field) is an important parameter needed to be measured for lightning warning systems. Yet, most of the E-field sensors are based on bulky and expensive rotate-vane mills. This paper presents a novel MEMS(Micro-electro-mechanical Systems)-based sensor and its application in near-ground atmospheric E-field long-term monitoring. We solve the problem of environmental adaptability by means of a novel macromolecular polymer package and moisture-proof design. To enhance the electric field resolution, a Φ 36mm×17mm probe is mounted separately from the signal processing circuit. Both finite element simulation and experimental results prove that this sensor could detect the electric field as small as 5V/m. The real-time monitoring data have a good consistency with those of the commercial electric field mill.
Piston Error Evaluation and Correction for Multi-aperture Imaging System
Authors: Junhong Qian , Hewei Liu , Ting Liu , Xiugang Ma , Ye Tao , Yulong Ji , Rongzhu Zhang
Published: March 2021

In this paper, the imaging quality of a three-aperture Golay3 imaging system is studied. The formula of point spread function (PSF) is derived when piston errors exist among each subaperture. The 1951 resolution target is used to analyze the imaging quality under the influence of different piston errors. To evaluate the imaging quality quantificationally, the Tenengrad function based on image gradient definition is employed. The fast steering mirror (FSM) controlled by PZT is used to eliminate the phase error in the optical structure of the Golay3 imaging system. The principle and formula of piston error correction are introduced. Using the Tenengrad function, the relationship between the movement of PZT and the image sharpness is obtained. Through the simulation of piston error correction, the piston error p = λ/2 in the system can be completely corrected when the PZT movement p’ = 0.35λ.
Pulsed laser deposition of high-quality diamond-like carbon films under an inhomogeneous magnetic field
Authors: Huang Guojun , Lu Yimin , Wang Sai , Ding Fangzheng , Wei Shangfang , Mi Chaowei , Tian Fangtao , Chu Hua , Cheng Yong
Published: March 2021

High-quality diamond-like carbon film was deposited on silicon substrate by magnetic field-enhanced pulsed laser deposition. The motion tracks of carbon ions in the inhomogeneous magnetic field were simulated. The thickness and surface morphology of carbon film were characterized by surface profilometer and atomic force microscopy, respectively. Mechanical property was evaluated by an indenter. The results showed that the deposition rate of the carbon film prepared under the magnetic field increased 1.7 times than that of the carbon film without magnetic field. The surface of the carbon films constructed of columnar particle arrays with the size ranging from 20 nm to 30 nm was improved and the roughness was decreased from 3.22 nm to 0.93 nm. The nano-hardness of the carbon film was 53.4 GPa, which increased by 18.1% than that of carbon film deposited without magnetic field. The experiment and simulation on the magnetic field-enhanced pulsed laser deposition proved that the new method of film preparation by magnetic filtration laser plasma deposition is feasibility.
Comparative study of internal force at lecture building in special region of Yogyakarta between 2D and 3D models with response spectrum method based on SNI 1726-2019
Authors: Utami S , Widodo S , Jaya D J
Published: March 2021

One of the important things in structural planning is structural analysis. Indonesia has earthquake resistance guidelines for building structures starting from SNI 1726-1989 to the latest version, namely SNI 1726-2019. Yogyakarta Special Region is an active and complex seismic area due to tectonic plate collision activity accompanied by local fault activity on the mainland, so it has a high level of seismic activity, therefore structural planning must pay attention to seismic aspects. Not all buildings in the special area of Yogyakarta use the latest earthquake-resistant building structure guidelines, so a review of the structure must be reviewed. In analyzing the structure, there are two models, namely, 2D and 3D structural analysis using structural analysis software to obtain the internal force value. The study of internal force comparison between 2D and 3D models of dynamic response spectrum method according to SNI 1726-2019 is carried out on the 4-floor lecture building structure used to determine the advantages and disadvantages of the two models. The results of the internal force structure analysis show that the value of the internal force with the 2D model is greater than the 3D model due to differences in the distribution of the working load.
Implementation of construction supply chain flow based on SCOR 12.0 performance standards
Authors: Sholeh M N , Nurdiana A , Dharmo B , Suharjono
Published: March 2021

Supply Chain Operations Reference (SCOR) is a supply chain performance measurement model that has been widely used in the manufacturing industry with the latest model version 12.0. This article presents the adoption and development of a construction supply chain performance measurement framework in Indonesia based on SCOR 12.0. The supply chain supply for ready mix concrete and steel as a case study consists of contracts, on-site inspection, material usage, and payment. Simulations were carried out on Project X with precast concrete supplied by ready mix concrete and steel with three suppliers each. Performance indicators from SCOR are analyzed and simulated to be implemented in the supply chain flow. The result is a contract phase with overall value at riks (OVAR), on-site inspection with perfect order fulfillment (POF) and order fulfillment cycle time (OFCT), use of materials with upside supply chain adaptability (USCA) and downside supply chain adaptability (DSCA), payment with total supply chain management costs (TSCMC) and the cost of goods sold (COGS), and overall flow with cash-to-cash cycle time (CCT), return on supply chain fixed assets (RSCFA), return on working capital (ROWC).
Training needs analysis for management of facilities and infrastructure learning automotive engineering
Authors: Hardiyanta R A P , Suyanto W , Arifin Z , Mujaki A , Saputro R D A
Published: March 2021

This study aims to: (1) identify problems of management of facilities and infrastructure practices of the automotive engineering department at Muhammadiyah Gamping Vocational School, (2) find the causes of problems management facilities and infrastructure practices of the automotive engineering department at Muhammadiyah Gamping Vocational School, and (3) formulate solutions to solve problems facility management and infrastructure practices majoring in automotive engineering at Muhammadiyah Gamping Vocational School. This research was conducted in March 2020. This research is a descriptive research using questionnaires and interviews to retrieve data. The population in this study were: (1) the principal, (2) the vice principal in the field of facilities and infrastructure, (3) the head of expertise competence, (4) the head of the workshop, and (5) the technician/toolman. Data analysis techniques using descriptive analysis techniques. The results showed that: (1) Problems that exist in the management of facilities and infrastructure practices of the automotive engineering department at Muhammadiyah Gamping Vocational School : (a) lack of motivation to work, (b) facilities and infrastructure are not well organized, (c) taste lacking, (d) low work discipline, and (d) low technical competence; (2) the causes of problems that occur include: (a) educational qualifications that are not appropriate, (b) do not have relevant expertise certificates, (c) there is no education and training that is in line with expectations; (3) an alternative solution that can be held is training of facilities and infrastructure managers in the practice of automotive majors at the Muhammadiyah Gamping Vocational School with competencies: (a) technical competence, (b) communication, and (c) workshop management.
Shape ande space: Banyuwangi opera house with a coastal enviromental approach
Authors: Kristiani E , Widjajanti W W , Hendra F H
Published: March 2021

Banyuwangi is a city with natural beauty and cultural uniqueness. One its cultures is Osing. Because it has many art performances, Banyuwangi does not yet have a special place to accommodate all art activities. Tourism in coastal areas has a high potential because it offers the beauty of natuew in every corner as its main atrraction. Banyuwangi Opera House is a combination of Banyuwangi Gandrung dance, patrol music, and Umbul-Umbul Blambangan song. Descriptive method was employed in this study using the results of comparative studies on art performance buildings that have cultural history. This design was made as an icon to describe the characteristics of Banyuwangi. The shape is an analogy from the typology of Osing Architecture consisting of tikel, baresan, and cerocogan by modifying the planes. Osing spatial planning includes bale, jrumah, and pawon with a space arrangement from front to back combine with colors identical to the distinctive Gandrung Sewu dance attire, namely red, yellow, and black. From the results of this study, it is expected that young generations can protect and preserve the wisdom of local culture through works of art.
Development and validation of learning media on combustion engine
Authors: Badu M R , Widarto  , Uno H B , Dako R D R , Uloli H
Published: March 2021

The research aims to develop learning media on fuel motor lesson concerning the aspects of media, material and media design. It is conducted in mechanical engineering education study program of State University of Gorontalo with the method and development of ADDIE model adopted from Lee and Owens. The research stage consists of analysis, design, development and implementation and evaluation. The development of learning media is carried out only to the stage of development and implementation. It shows that the product of interactive multimedia-based learning media on fuel motor lesson is feasible to be applied, it is based on the expert validation with the percentage of 85% (media design expert), 75% (media expert), and 87% (material expert). The average of all aspects achieved is 82.333% (very feasible)
The innovation of intelligent system e-consultant learning to improve student mindset of vocational education in the disruptive Era 4.0
Authors: Putra A B N R , Insani N , Winarno A , Puspitasari P , Kiong T T , Habibi M A , Tuwoso  , Subandi M S
Published: March 2021

In this disruptive 4.0 era, the student mindset has decreased significantly. This mindset is related to the ability to become a professional teacher. This is due to the very limited number of innovations in the form of an expert system as a means of direct consultation regarding vocational education. This study aims to: 1) analyze the factors that influence the student mindset of vocational education in the disruptive era; 2) developing the innovation of intelligent e-consultant learning system, and 3) testing the level of attractiveness of the innovation of intelligent system e-consultant learning. The method used in this study is the research and development (R&D) method. The informants in this study were all vocational education students at State Universities in East Java. Expert testing was carried out by experts in online learning media and material experts in the field of vocational education. The results of this study include: 1) the factors that affect the student mindset of vocational education in the disruptive era, namely internal factors (problems manipulate abilities, education perceptions, thinking tenacity, social interaction, high curiosity, experiment ability, and reliable creator), and external factors (work environment, association with the society, belief systems, family relationships, and educational policies); 2) the innovation of intelligent e-consultant learning system developed has a high level of attractiveness and is well based on experts in online learning media and material experts in the field of vocational education; and 3) the product innovation of intelligent system e-consultant learning developed can be used as an alternative learning media in a disruptive era.
Technology to develop student writing skill: a portrait of english language teaching in remote area
Authors: Yulia Y , Amirudin S
Published: March 2021

The significant change of technology drives teachers to have much better teaching performance. Teachers need to incorporate technology into classrooms. It is widely discussed as Technology Pedagogical Content Knowledge (TPACK). The objectives of this research are to describe technology - Aegisub - in developing students writing competence of vocational school including its strengths and weaknesses. This research belongs to Classroom Action Research (CAR) and it was conducted at grade 10th of private vocational school in remote area. Observation, semi structured interviews as well as document are employed to gain data. Finding shows that teachers used technology to develop students writing competence. Procedures of teaching and learning activity referred to Indonesian’s Education Minister Decree, the so-called, scientific approach - observing, questioning, experimenting, associating, and communicating - to teach descriptive texts. Students do installing the software, selecting video using Aegisub and eventually modify the text using features provided by Aegisub. The strengths of the use of Aegisub application is students’ engagement in learning process. Meanwhile, the error system and automatic grammar correction become the weaknesses of the application. Overall, technology can be a means of students to increase students’ motivation and creativity in the teaching-learning process, in particular to develop writing skills.
Green skills in vocational learning through the project citizen model
Authors: Fitriyanto M N , Diplan  , Pribadi A
Published: March 2021

The problem in this research is effort to increase green skills implementation in vocational school. The purpose of research is how green skills implementation through the project citizen model. The method used is Classroom Action Research (CAR). The subjects of the study were students of SMK Muhammadiyah Palangka Raya and SMKN 1 Palangka Raya in class XI. The results of this study indicate that the planning carried out in this study is to sort waste according to the type of waste. Another thing when implementing is the need for deeper explanation to students in identifying green skills problems, explaining solutions in applying green skills, and efforts to apply green skills to students when practicing in a laboratory or workshop. In this study an increase in green skills in the aspects of the ability to sort waste, the ability to analyze costs, and the ability to process products that will be made with used waste. This can be seen from the results that have been described where from each cycle from cycle I to cycle III increased in aspects of waste management with a score of 82 (good), the ability to make products from used mate-rials with a score of 3.7 (very good) and the ability to analyze the production costs of the product to be made with a score of 3.70 (very good) related to green skills in students practicum in vocational education.
Developing an android-based learning media of making shirt collar for vocational school students
Authors: Apsari A , Budiastuti E
Published: March 2021

This research aims to produce an android-based learning media for making shirt collar for vocational school student and determine its feasibility level based on the assessment of theoretical experts, media experts, and students. This research was done reffering to the research and development procedure using 4D development models by Thiagarajan. Data collection method with observation and interview to obtain preliminary data and questionnaires to find out the results of the feasibility. The subjects of this research were 2 material experts, 2 media expert and 34 fashion students in SMK N 1 Depok. Android-based media learning was created using Android Studio software. The results of this research and development were developed product of android-based learning media for making shirt collar with file size 9.3 MB and the result of the feasibility of android-based learning media based on assesment of material expert and media expert obtained 100% (very feasible), small-scale trial result obtained 85.95% (very feasible), and the large-scale test result obtained 85,05% (very feasible). Based on these results, android-based learning media of making shirt collar was feasible for use to help teachers and students in learning activities.
Formulation of pomade with atisiri oil pandan wangi leaves (pandanus amaryllifolius roxb.)
Authors: Siregar I P , Marliati N
Published: March 2021

This research aims to: 1) know the formulation of pomade making from aromatic pandan wangi leaf essential oil, 2) know the characteristics of pomade from the essential oil of pandan wangi leaves, and 3) know the quality of pomade from the essential oil of fragrant pandan leaves, and 4) the anti-fungal activity of pomade from the essential oil of pandan wangi leaves. Research methods used by research and development (R&d) models. Formulation of pomade manufacture of pandan wangi leaf essential oil is carried out based on the results of research that produces a stable formula that is pomade with the appropriate quality SNI with the base of pomade type oil based and not petrol based with a concentration of 34% of the total weight of pomade. Pomade formula is added to the essential oil of pandan wangi leaves with different concentrations of 2.5% (formula 1), 5% (formula 2) and 7.5% (formula 3). The characteristics and quality of pomade are known from organoleptic and hedonic tests that 47% of respondents strongly agree with pomade has the aroma of essential oil of pandan wangi leaves, 52% of respondents strongly agree with the color of pomade in dark green, 45% of respondents strongly agree with the texture of pomade very smooth without any granules, the respondent’s response after pomade is on a smooth impression as much as 90.56% and the impression is moist as much as 90.00%. Formula 1 to formula 3 provide homogeneous results. Formulas 1 through 3 have a pH balance with pH range of hair and oil on the scalp which is 5.5 between pH 4.5 -5.5. The largest antifungal activity is in formula 3 (essential oil content 7.5%) with an inhibithor zone diameter of 37 mm. This indicates that the greater the concentration of pandan wangi leaf essential oil, the stronger the antifungal activity against niger’s Aspergillus.
Instructional media using video scribe for training industrial electronics teachers
Authors: Mashoedah
Published: March 2021

One of the weaknesses in the teacher training program is the minimum use of instructional media and unsuitability of teaching method while in fact those two are really needed. the research is aimed at developing the instructional media using Video Scribe application for teacher trainings. It employed the Design and Development Research (DDR). The data were collected through questionnaires using the rating scale and analysed quantitatively descriptively. The results obtained indicate that the learning media using video scribe for teacher training is very feasible to use.
Fabrication, Thermal and Sound Absorption Properties of Porous Polyimide Reinforcing by SiO2 Nanoparticles
Authors: Zhao Yalin , Geng Mingxin , Ma Jiangang , Peng Longgui
Published: March 2021

Special requirements of the service environment put forward higher requirements for the comprehensive performances of porous sound-absorbing materials. In this study, the polyimide/nano-SiO2 composite foams were prepared based via the sol-gel and foaming methods. The effect of different addition of SiO2 nanoparticles on the pore structure, sound absorption properties as well as the thermal properties of polyimide/SiO2 nanocomposite foams are studied. Results indicate that: the addition of the nano-SiO2 particles not only could improve the thermal stability of the composites, but also increase the sound absorption performances. Particularly, the samples with 2% addition of SiO2 nanoparticles shows the optimal thermal and sound absorption performance. Therefore, adding the SiO2 nanoparticles into the polyimide foams is an efficient way to improve its thermal and sound absorption performance, which would give insights into designing sound-absorbing materials with excellent comprehensive performance to curb the noise pollution.
A Simple Method to Reversibly Switch the Reflectance Spectrum of a Layered Structure Consists of an Ultra-Thin Film Phase-Change Material GST
Authors: Ding Jianping , Xu Ziquan , Ghosh Pintu , Li Qiang
Published: March 2021

By applying pulsed laser and CW laser to irradiate the top layer phase-change material GST, we realized reversible optical switching of reflectance of a layered structure. The FTIR measured reflectance spectrum proved that the reflectivity at 8 μm could be changed reversibly from 0.19 to 0.90. Our research may have some inspiration for active thermal control and other applications.
Hot Deformation Behavior and Processing Map of 5356 Aluminum Alloy
Authors: Zhou Tianguo , Ke Changfen , Chen Tiantian
Published: March 2021

The hot compression deformation of 5356 aluminum alloy was performed with the deformation temperature 300∼500°Cand the strain rate 0.01∼10s−1 by using Gleeb1e-3500 thermal mechanical simulator. The microstructure of the alloy was analyzed by ZEISS metallographic microscope. The results show that the flow stress of 5356 aluminum alloy decreases with the increase of deformation temperature and increases with the increase of strain rate. 5356 aluminum alloy is mainly dynamic recovery under low strain rate conditions, such as 0.01 S−1, 0.1 S−1. The alloy is discontinuous dynamic recrystallization under high strain rate conditions, such as 1 S−1, 10 S−1. The hot processing map of 5356 aluminum alloy was established with the strain of 0.2∼0.5, can provide an effective data reference for the development of high-end 5356 aluminum alloy wire continuous rolling process.
Research Overview on Calculation of Shear Strength of Reinforced Concrete Bridge Piers
Authors: Ran Longhua , You Lihui , Liu Wei , Wang Zhongqiang , Zhong Tieyi
Published: March 2021

In this paper, the present research status on the shear capacity of piers at home and abroad was reviewed, and the principles and methods of the nine formulas for calculating the shear capacity presented by domestic and foreign codes and scholars were introduced in detail. The nine formulas were compared with the test data from Chenglan railway bridge piers to discuss the existing problems. The results show that the calculation formulas proposed by some scholars are more complicated and more factors are taken into account, while the calculation formulas proposed by the codes are simpler and more conservative. The existing formulas for calculating the shear capacity of bridge piers are mostly acquired by fitting of the experimental data and it is too simple to consider reduction effect of the stress distribution and shear capacity of section concrete with the increase of displacement ductility, so it is difficult to evaluate the applicability. Therefore, further research on the calculation formula of shear strength for bridge piers is needed.
Study on Modeling Method of Reinforced Concrete Pier Based on OpenSees
Authors: Yang Zhihui , Li Chuanfu , Liu Lei , Yang Haiyang , Zhong Tieyi
Published: March 2021

In this paper, the method of model established on reinforced concrete pier based on OpenSees was studied, and the parameter sensitivity analysis to OpenSees was carried out according to the test data. On the basis of introducing the related material model and element type, how to determine material model and element division as well as section meshing were studied, and the method of model established both reasonable and effective was given. The model of concrete material which can improve the convergence of calculation and the model of reinforced materials which can simulate elastic and reinforced plastic stage accurately were given in this paper. The results show that the distributed plastic beam-column element based on displacement can get higher calculation precision. At the same time, the bridge pier structure should be meshed sufficient number of elements and girds to meet the requirement of calculated accuracy.
Experimental Study on Friction Coefficient of Strands for Large Cross-Section ACSR in Transmission Lines
Authors: Qin Jian , Wan Jiancheng , Qiao Liang , Liu Chen
Published: March 2021

According to the structural characteristics of aluminum conductor steel reinforced (ACSR), an experimental system is developed for the contact friction between steel and aluminum strands. The test parameters such as contact force and cross angle between strands are determined by the ACSR structure of JL1/G3A-1250/70-76/7. The curves of frictional force are obtained from the contact friction tests between steel core and aluminum strand, aluminum strand and aluminum strand under different conditions. The friction coefficient of strands under different contact conditions is obtained by statistical analysis, which provides support for further research on contact deformation analysis of strands in ACSR.
Evaluation of Groundwater Exploitation Scheme in Water Source Area of Kang Ping Power Plant Based on GMS
Authors: Zhao Xueqiong , Ding Fengfeng , Xu Jun , Zhang Jie
Published: March 2021

On the basis of finding out the existing conditions of groundwater in the source area of Kang Ping power plant, GMS is used to construct the 3D perspective of aquifer structure and the numerical simulation model of groundwater flow system. According to the water demand of the water source area, two mining schemes are proposed. Based on GMS software, the groundwater flow field evolution of the two mining schemes in the study area from 2019 to 2022 is simulated by using the model. The results show that the overall groundwater level in the study area presents a stable situation under the mining condition of scheme I 9600 m3 / d, and under the mining condition of scheme II 12000 m3/d, the groundwater depression funnel is expanding. It is suggested to adopt scheme I comprehensively, the water supply capacity can be guaranteed, and the mining volume can be appropriately expanded in case of large water demand, but it should not exceed 12000 m3 / d.
Experimental Study on Influence of Vegetation Roots on Hydraulic Characteristics of Slope under Rainfall
Authors: Meng Suyun , Zhao Guoqing , Yang Yuyou
Published: March 2021

The water uptake by roots can change the soil permeability of slope. However, the affect mechanism of roots on hydraulic characteristics of slope under rainfall is insufficient. A laboratory test of vegetated slope and bare slope under rainfall was conducted to investigate the variety and distribution of suction. The influence of root water uptake on soil suction and water content of slope was studied. The soil water characteristic curve of bare slope and vegetated slope was established to study the influence of root water uptake on the water-holding capacity of soil. The results show that the influence range of root water uptake on the soil suction can reach twice the root depth, and the suction in the downhill position is smaller than that in the upward position induced by the lateral flow of water. In addition, root water uptake makes the suction of vegetated slope higher than that of bare slope, which will improve the water-holding capacity of soil, and then enhance the shallow stability of slope.
Numerical Simulation Research on Multi-field Coupling of Underground Energy Pile
Authors: Zhou Qihui , Huang Zhanjun , Wu Yong , Zhang Huipeng , Shi Yufeng , He Xiaohui , Chen Qianshen , Yao Wangjing , Liu Weiting
Published: March 2021

The bearing capacity of the pile foundation determines the safety and stability of the upper structure. However, during the thermal cycling of the energy pile, the stress of the pile will be changed due to temperature changes., which will affect the bearing capacity of the energy pile foundation. In order to analyze the mechanical properties of the energy pile under multi-field coupling, the finite element software COMSOL Multiphysics is used to establish the thermal-mechanical coupling analysis model of the energy pile. We apply thermal load on the pile body and vertical load on the top of the pile. The results show that: Under the multi-field coupling of temperature and mechanical load, the energy pile body expands when heated, and the displacement of the pile top decreases; this will cause uneven settlement between the energy pile foundation laying the heat exchange tube and other pile foundations, which will lead to the tilt and damage of the superstructure; the stress of the pile during the heating of the energy pile will increase.
A Critical-analysis on the Development of Micro Grid in China
Authors: Wang Junhai , Yin Jianbing , Chen Lin , Chen Zhiyuan , Gong Yingfei , Tan Qingkun
Published: March 2021

With the combination of Internet, information technology and energy, micro grid plays an important role in the adjustment of energy structure with its abundant resources and friendly environmental benefits. This paper introduces the status of micro grid and renewable Energy of the status quo, In the second part, the development status of the micro-grid is introduced in the second part. In the third part, the future development trend of micro-grid is given. The conclusion of this paper and the suggestion of micro-grid development are given.
Design of Ackerman Mobile Robot System Based on ROS and Lidar
Authors: Dong Mingze , Chen Donghong , Ye Nan , Chen Xiai
Published: March 2021

An ackerman mobile robot system based on ROS and lidar was developed in this research. The i5 industrial control computer was taken as the core controller, and the Ubuntu system was installed inside, the control core of the driving part was the STM32 microcontroller. Using the external environment information obtained by lidar and IMU sensors, the corresponding SLAM algorithm was developed and designed under the Linux system based on the distributed framework of ROS operating system. Through establishing the feature map of environment, the system can locate position and posture of vehicle body in real time, and generate optimal path according to the given target point automatically identify and avoid surrounding obstacles. According to the state of the robot and the commands of the user, it can realize the functions of human-computer interaction, SLAM map scanning and drawing, Wi-fi remote control, real-time positioning, autonomous navigation, etc. efficiently and quickly.
Design of Double Carrying Rope Material Ropeway System
Authors: Liu Chen , Qin Jian , Qiao Liang , Jia Ning
Published: March 2021

According to the transport requirements and structural characteristics of double carrying rope material ropeway, a lever type double carrying rope material ropeway system is proposed. Through lever device and limit device, the tension between two carrying ropes can be adjusted automatically. Combined with the terrain, the stress status of the main components of the material ropeway is obtained through analysis and calculation, and the selection parameters of the components such as working rope, self-adjusting device and saddle are proposed and checked by finite element analysis. The results show that the components meet the structural strength requirements, and the automatic balance adjustment function of the designed material ropeway system can improve the stability of the material ropeway operation, reduce the difficulty of adjustment in the construction process, and improve the construction safety and efficiency.
Mussel-inspired antimicrobial coating on PTFE barrier membranes for guided tissue regeneration
Authors: Nardo Tiziana , Chiono Valeria , Carmagnola Irene , Fracchia Letizia , Ceresa Chiara , Tabrizian Maryam , Ciardelli Gianluca
Published: March 2021

Guided tissue regeneration procedures to treat periodontitis lesions making use of polytetrafluoroethylene (PTFE) membranes exhibit large variability in their surgical outcomes, due to bacterial infection following implantation. This work reports on a facile method to obtain antimicrobial coatings for such PTFE membranes, by exploiting a mussel-inspired approach and in-situ formation of silver nanoparticles (AgNPs). PTFE films were initially coated with self-polymerized 3,4-dihydroxy-DL-phenylalanine (DOPA) (PTFE-DOPA), then incubated with AgNO3 solution. In the presence of catechol moieties, Ag+ ions reduced into Ag0, forming AgNPs of around 68 nm in the polyDOPA coating on PTFE membranes (PTFE-DOPA-Ag). The x-ray photoelectron spectroscopy, atomic force microscopy and scanning electron microscopy analyses indicated that the AgNPs were distributed quite homogeneously in the polymeric membrane. The antimicrobial ability of PTFE-DOPA-Ag membranes against Staphylococcus aureus and Escherichia coli was assessed. In vitro cell assay using NIH 3T3 fibroblasts showed that, although cells were adhered to PTFE-DOPA-Ag membranes, their viability and proliferation were limited demonstrating again the antibacterial activities of PTFE-DOPA-Ag membranes. This work provides proof-of-concept study of a new versatile approach for AgNPs coating, which may be easily applied to many other types of polymeric or metallic implants through exploiting the adhesive behavior of mussel-inspired coatings.
Invasive Phragmites provides superior wave and surge damage protection relative to native plants during storms
Authors: Sheng Y Peter , Rivera-Nieves Adail A , Zou Ruizhi , Paramygin Vladimir A , Angelini Christine , Sharp Sean J
Published: March 2021

Phragmites marshes, which are found in every continent except in Antarctica, are being removed by resource managers in the US because it is considered an invasive species with little ecosystem service value. Here we present a comprehensive study on the ecosystem service value of an invasive Phragmites marsh vs a native Typha marsh for flood protection during tropical cyclones. Using a vegetation-resolving three-dimensional surge-wave model and observed vegetation and building data, we assessed the value of the Piermont Marsh in buffering Piermont Village, New York, USA from wave, flood, and structural damage during Superstorm Sandy in October 2012. Observed and simulated wind and water level data along the Hudson River were used as boundary conditions. Model results showed that the Marsh, with predominantly invasive Phragmites australis, dissipated more than half of the wave energy, but negligible flood, at the Village during Sandy. River-borne debris could not be transported across the Marsh to the Village. If Phragmites were replaced with the shorter, native cattail, Typha angustifolia, simulations of Sandy suggested that Piermont Marsh’s wave and debris buffering capacity would be preserved. However, had Sandy occurred in non-growth season when Typha is much shorter and sparser, the Marsh would be unable to buffer the wave and debris. Simulated residential structure damage during Sandy (>$10 M) agreed well with reported losses. If the Marsh were absent, the total loss would have increased by 26%. Since damage is dependent on the storm characteristics, we estimated the protective value of the Phragmites marsh for a 1% annual chance flood and wave event to be more than $2 M. This confirms the significant value of Piermont Marsh in protecting Piermont Village from flood and wave damage. To develop a balanced restoration plan, marsh managers should consider biodiversity as well as the significant ecosystem service value of Phragmites-dominated marsh for flood protection.
Digital technologies in wine sector: Russian legislator preferences
Authors: Kudryashova Ekaterina , Casetti Michele
Published: March 2021

Russia has revived its vitiviniculture in the beginning of XXI century. Without the burden of old regulation and established reputation the modern technologies including digital technologies could be expected to prosper here. To certain extent it happened and Russian academics and innovators have offered some digital solutions for the wine makers related to the mapping of the vineyards and crop. Still predominantly, the digital technologies in Russia are designed for the control and surveillance. The legislation on viticulture and wine making and its social environment push the technology development toward the vigilance and control of the final product rather than towards the transformation of vineyards management. The renaissance of the viticulture in Russia opens unique opportunity to make Russian vitiviniculture modern and advanced sector of economy. However, this innovative potential is still left unexploited.
Optimization of terms and rate of Puma Plus, EC application on spring wheat crops
Authors: Rendov N A , Nekrasova E V , Mozyleva S I , Lutchenkov A A
Published: March 2021

The data of three-year studies on determination of the optimal terms and rates for the herbicide Puma Plus use, EC on spring wheat crops are presented. The experiments were carried out on meadow-chernozem medium-low-humus medium-loamy soil in the southern forest-steppe of the Omsk region. In the variant without herbicide use, the proportion of weeds in the agrophytocenosis varied over the years from 12.9 to 19.0%, which corresponded to the average degree of infestation. Spraying of wheat crops began with the formation of 2-3 leaves in the culture and continued every 5 days. 20 days after the first period of herbicide application, 2-3 nodes were noted on wheat stalks (a variant with the last treatment period). Three herbicide rates were used – 1.3, 1.4 and 1.5 l/ha. At all treatment periods and herbicide rates, a weak level of contamination was achieved. The share of weeds was in the range of 0.1-5.8 %. Increases in the yield of wheat grain are significant for all terms and rates, which indicates the possibility of using the Puma Plus herbicide, EC from the formation of 2-3 leaves and up to the formation of 2-3 nodes on wheat stalks.
Electrotechnology in the production of phytogenic feed additives
Authors: Basarygina E M , Leshchenko G P , Leshchenko E A , Putilova T A , Torbeev I G
Published: March 2021

In various sectors of the agro-industrial complex, innovations are used to improve production efficiency. For livestock and poultry farming, innovative solutions related to feed additives are especially relevant. A valuable phytogenic additive to the feed rations of farm animals and poultry is hydroponic green fodder obtained by germinating seeds. Off-season obtaining of green forage on a hydroponic basis is associated with significant expenditures of thermal and electrical energy, in connection with which the urgent task is to reduce the energy intensity of production. To increase the energy efficiency of green fodder production, it is proposed to create the necessary conditions for the seeds to realize their potential with the help of methods and means of electrical technology, which make it possible to realize “smart” (controlled) germination and to influence the bioelectric potentials of seeds due to their electrification. As a result of the studies carried out, the maximum charge received by germinating seeds of legumes in the corona discharge field was determined. It was found that the electrification of germinating seeds promotes the activation of growth processes, an increase in the yield and quality of hydroponic green forage, and a decrease in the energy intensity of its production.
Foodnet Market: role of rural schools
Authors: Merzlyakova D R , Miroshnichenko A A , Baranov A A , Morozov V I , Samigullina G Z
Published: March 2021

Existing directions of Foodnet market technologies development were defined. The correlation between the food culture of schoolchildren and Foodnet market development directions is considered. The role of a rural school in training personnel for Foodnet market is defined. The necessity of purposeful work for the formation of a food culture of teaching students Foodnet technologies: traditional food products; group personalized food; alternative sources of raw materials; precision agriculture; food substitutes; individual personalized food; genomics (plants and animals); durable production methods is indicated. A program of teaching students in this area was developed, including familiarity of students with technology will Foodnet, educational actions to ensure the readiness of students to make a conscious choice in favor of nutrition, a system of educational activities with teachers and parents was developed, focuses on the development of a culture of healthy eating in educational organizations. In the survey of rural students priorities in the choice of profession and knowledge of Foodnet technologies were identified.
Environmental-social barriers of the agri-food market as indicators of anthropogenic load on the agro-industrial system
Authors: Shumakova O V , Kryukova O N , Mozzherina T G
Published: March 2021

This article deals with the interaction problems between man, nature and social institutions in the context of changing politics and strategy of the state in this field. Features of anthropogenic load on the agro-industrial complex were studied. The concept of barriers to entry the agri-food market, classification and types of barriers were defined. Ecological-social barriers have been investigated. The article is intended for specialists of the Ministry of agriculture and food of the Omsk oblast and local self-government bodies of regional municipalities, heads of agricultural organizations and processing enterprises, farmers, market specialists, researchers, teachers and students of agricultural universities.
Results of regulation of state agricultural companies activities in Russia
Authors: Yakovlev A
Published: March 2021

In the structure of modern Russian economy state play a key role in many spheres. Agriculture is one of them. The Russian Federation is the owner of the largest agricultural companies. Russian regions are also shareholders of a few hundred join-stock companies in agriculture sphere. A big number of state agricultural companies are ineffective. One of the reasons is the existing regulation system. It’s far from ideal and generates a number of problems. They have different forms, but all lead to a low profit value or even to bankruptcy. This research is one of few scientific papers on the theme of state agricultural companies in Russia.