bluuebunny/crossref_metadata_2025 huggingface dataset:
Meningkatkan Kemampuan Siswa Dalam Memecahkan Masalah Matematika Dengan Model Pembelajaran Treffinger
Authors: Permatasari Neng Yani , Margana Akhmad
Published: May 2024

To realize the expectation that students be creative and have a mathematical problem-solving ability is good, of course also needed a learning model based on creative problem solving. Among the learning model in question is the learning model Treffinger. This learning model will make students more active and make learning more fun activities. The author would like to see if an increase in the ability of students to solve problems that get Treffinger models better than the students who received the conventional model? The method that I use in this study is the experimental method, that is by giving the treatment at two different sample classes. Based on the research results of the final test can be concluded there is an increase in the ability of students to solve problems that get better Treffinger models compared with the students who get a conventional model.
Untuk mewujudkan harapan agar siswa menjadi kreatif dan memiliki kemampuan pemecahan masalah matematika yang  baik, tentu dibutuhkan pula model pembelajaran yang berbasis pada pemecahan masalah secara kreatif. Diantaranya model pembelajaran yang dimaksud adalah model pembelajaran Treffinger. Model pembelajaran ini akan menjadikan siswa lebih aktif serta menjadikan kegiatan pembelajaran lebih menyenangkan. Penulis ingin melihat apakah  peningkatan kemampuan siswa dalam memecahkan masalah yang mendapatkan model treffinger lebih baik dibandingkan dengan yang siswa yang mendapatkan model konvensional?. Metode yang penulis gunakan dalam penelitian ini adalah metode eksperimen, yaitu dengan cara memberikan perlakuan pada dua kelas sampel yang berbeda. Berdasarkan hasil penelitian tes akhir dapat diambil kesimpulan terdapat peningkatan kemampuan siswa dalam memecahkan masalah yang mendapatkan model treffinger lebih baik dibandingkan dengan yang siswa yang mendapatkan model konvensional.
Pengaruh Model Pembelajaran Berbasis Masalah Terhadap Kemampuan Koneksi Matematis Siswa Dalam Pembelajaran Matematika
Authors: Sugiarti Sri , Basuki
Published: May 2024

Learning mathematics is meaningful if the students can connect the mathematical ideas, connecting between mathematical topic, connecting mathematics to other disciplines, and connecting mathematics in daily activity. The study quasi experiment with Non-Equivalent Control Groups Design was aimed to find out that the ability of mathematical connections that students gain in problem-based learning were better than getting a conventional learning and students' attitudes toward problem-based learning. The sample of this study was the students at Senior High School 2 Garut. Then, the results showed that: (1) The Ability of mathematical connections that students gain in problem-based learning were better than getting a conventional learning, (2) Students’ attitudes toward problem-based learning were positive.
Pembelajaran matematika akan bermakna apabila siswa dapat menghubungkan ide-ide matematika, menghubungkan antartopik matematika, menghubungkan matematika dengan disiplin ilmu lain, dan menghubungkan matematika dengan kehidupan sehari-hari. Penelitian kuasi eksperimen dengan Nonequivalent Control Group Design. ini bertujuan untuk mengetahui kemampuan koneksi matematis siswa yang mendapatkan pembelajaran berbasis masalah lebih baik daripada yang mendapatkan pembelajaran konvensional, serta sikap siswa terhadap pembelajaran berbasis masalah. Sampel populasi dalam penelitian ini adalah siswa SMA Negeri 2 Garut. Hasil Penelitian menunjukkan bahwa: (1) Kemampuan koneksi matematis siswa yang mendapatkan pembelajaran berbasis masalah lebih baik daripada yang mendapatkan pembelajaran konvensional, (2) Sikap siswa terhadap pembelajaran berbasis masalah adalah positif.
Perbandingan Kemampuan Komunikasi Matematis Siswa Antara Yang Menggunakan Model Pembelajaran Kooperatif Tipe Jigsaw Dengan Konvensional
Authors: Hibattulloh Nanang , Sofyan Deddy
Published: May 2024

Penelitian ini merupakan penelitian quasi eksperimen dengan desain Randomized Pretest-Posttest Control Group. Permasalahan dalam penelitian ini adalah apakah kemampuan komunikasi matematis siswa yang menggunakan model pembelajaran kooperatif tipe Jigsaw lebih baik dari pada siswa yang mendapatkan model pembelajaran konvensional. Populasi pada penelitian ini adalah seluruh siswa kelas VII SMPN 2 Bayongbong, dengan sampel diambil secara Purposive Sampling yaitu kelas VII H (kelas eksperimen) dan VII D (kelas kontrol). Berdasarkan tes akhir, terdapat data yang berdistribusi tidak normal pada keduanya sehingga pengolahan data dilanjutkan dengan statistik non parametrik yaitu Uji Mann Whitney. Dari hasil analisis Uji Mann Whitney dengan taraf signifikansi 5% diperoleh zhitung = -2,046 dan ztabel = 1,96 yang mana zhitung berada di luar daerah penerimaan Ho, maka Ho ditolak dengan demikian kemampuan komunikasi matematis siswa yang mendapatkan model pembelajaran kooperatif tipe jigsaw lebih baik dari pada siswa yang mendapatkan model pembelajaran konvensional.
This research was a quasi-experimental design with randomized pretest-posttest control group. The problem in this study is whether the mathematical communication skills of students who use the Jigsaw cooperative learning model better than the students who received conventional learning models. The population in this study were all students of class VII SMP 2 Bayongbong, with samples taken by purposive sampling is class VII H (experimental class) and VII D (control class). Based on the research results of the final test, the data are derived distribution is not normal on both so that the processing of data followed by non-parametric statistical test Mann Whitney. From the analysis of the Mann Whitney test with significance level of 5% result data obtained zcounting = -2.046 and ztable = 1.96 which is outside the reception area Ho, the Ho is rejected thus mathematical communication skills of students who get jigsaw cooperative learning model better than the students who get the model conventional learning.
Sistem Pengambilan Keputusan Untuk Pemilihan Teknisi Lab Dengan Multi Kriteria Menggunakan Metode Ahp (Analytic Hierarchy Process)
Authors: Suryadi Andri , Nurdiana Dian
Published: May 2024

Dalam proses perekrutan calon pegawai ada beberapa kategori kemampuan diambil untuk mendapatkan calon pegawai yang terbaik. Kategori kemampuan yang dimaksud adalah kemampuan hardskills dan softskills. Namun, dengan adanya kategori tersebut menjadi sulit bagi tim seleksi untuk mendapatkan keputusan yang terbaik terutama dalam relasi antar kategori yaitu kolaborasi hardskills dan softskills. Oleh karena itu dibutuhkan suatu metode untuk dapat menyelesaikan pengambilan keputusan dengan banyak kategori. AHP (analytic hierarchy process) merupakan metode yang dapat menyelesaikan masalah pengambilan keputusan berdasarkan banyak kategori. Kemampuan hardskills dan softskills dapat dikolaborasikan menggunakan AHP (analytic hierarchy process) sehingga keterkaitan antara kategori menjadikan proses perekrutan menjadi optimal.
A Machine Vision-Based Edge Detection Method for Belt Lap of Pipe Belt Conveyor
Authors: Hao Nini , Wang Xingyu , Zhang Yuan , Zhang Mengchao , Sun Changzheng , Hu Chengquan
Published: May 2024

The extraction of positional features from the longitudinal lap edge straight line of the conveyor belt in a pipe belt conveyor holds significant importance in the detection of conveyor belt torsion faults. This study presents a proposed algorithm for detecting the longitudinal lap edge on a conveyor belt using machine vision. The algorithm involves several steps, including extracting regions of interest (ROI) from conveyor belt images and converting them to grayscale. Local enhancement is achieved through image stretching, and edge features are extracted using the Prewitt operator. Morphological methods are then applied to address impurities, and the lap edge is detected through straight line detection using the Hough transform. The conducted experiments involving the utilization of OpenCV on authentic images of a cylindrical pipe belt conveyor within an industrial setting demonstrate the algorithm’s proficient ability to accurately recognize the longitudinal lap edges of conveyor belts.
Design of Infrared Automatic Running Water Alarm Device
Authors: Zhang Yong , Yao Panlong , Yu Jiamin
Published: May 2024

In the traditional infusion process, medical staff need to regularly observe the change of liquid level in the infusion bottle to confirm the dressing change time, which not only increases the workload of medical staff, but also increases the risk of emergency. In this paper, a kind of infrared automatic alarm device based on AT89C51 MCU is designed, which can monitor the liquid level change in infusion bottle in real time and remind medical staff to replace infusion set in time. According to the principle of infrared positioning and monitoring, the device collects the liquid level information in real time and gives an alarm when the liquid level is too low. Proteus software is used to simulate the whole control system. Through analysis, it is found that when the liquid level of the infusion set is too low, the infrared signal waveform changes, so the automatic alarm device has a high accuracy.
Belt Rotation in the Pipe Conveyor: Research on a Detection Method Based on Image Processing
Authors: Yuan Chao , Zhang Yuan , Zhang Mengchao , Wang Zhuang , Zhang Dongyue
Published: May 2024

Pipe belt conveyors provide sustainable solutions for environmentally sensitive or topographically complex powdered and bulk-solid handling processes; belt rotation is one of the most common faults of pipe belt conveyor, and the current pipe belt conveyor project commonly adopts manual periodic inspection method to detect faults, which has the disadvantages of high danger, low efficiency, high labor intensity of inspection staff, and untimely fault discovery leading to serious engineering accidents. In view of the above problems, this paper investigates the research of conveyor belt torsion detection method of the pipe belt conveyor based on image processing, analyzes the mechanism of conveyor belt rotation determination, puts forward an edge detection method based on OUST-Canny operator, and extracts straight line features of conveyor belt edges by using Hough transform and analyzes the processing, and ultimately realizes the detection of belt torsion faults of the pipe belt conveyor. This method greatly simplifies the process of linear feature extraction in complex environments and helps to realize the intelligentization of the pipe belt conveyor, which ensures the safe and efficient transportation of the pipe belt conveyor and at the same time realizes the green, energy-saving and sustainable development.
Two Modes of Compressive Buckling Instability of Bilayer Structures
Authors: Ma Lijun , Zhou Shichen , Xue Shifeng
Published: May 2024

The bilayer structure with hard upper layer and soft lower layer is widely used in many fields, and these applications have raised considerable interests in recent years. The two modes of compressive buckling instability, deformation mechanism, and evolution law of the bilayer structure need to be studied in depth. To solve these problems, the following research was carried out. Based on the pre-stretching method and thermal induction method, the ordered one-dimensional wrinkle structure and disordered random wrinkle structures was experimentally prepared in the Au/PDMS and Au/PS bilayer structure surfaces, and surface morphology, cracks, and interface were characterized. Based on the nonlinear Von Karmen plate theory, the buckling behaviors of bilayer structure was analyzed. The two modes of compressive buckling with and without delamination of the interlayer interface between film and substrate is studied for the bilayer structure using finite element numerical simulation. The results reveal that the amplitude and required load of bilayer structures have the same evolution laws with compressive strain under the conditions of interface delamination and non-delamination.
Kinematic Performance Optimization of Double Wishbone Suspension Based on ADAMS
Authors: Sun Shihao , Zhu Yan , Du Juan , Jiang Zhaozhuang
Published: May 2024

Use ADAMS software to optimize the suspension kinematic parameters to make a certain double wishbone suspension have superior kinematic performance. Firstly, establish a suspension simulation model in ADAMS/Car and make wheel jump simulations for the model. Upon completion of the simulation, ADAMS/PostProcessor delivers the change range of the 4 main kinematic parameters of double wishbone suspension: Toe Angle, Camber Angle, Kingpin Caster Angle, and Kingpin Inclination Angle. Secondly, choose the variable points coordinates. ADAMS/Car and ADAMS/Insight jointly optimized the coordinates. Thirdly, the two wheel jump simulations of the coordinate-optimized suspension are carried out again, and after the simulations, the optimization data of the 4 kinematic parameters are obtained. Finally, analyze the optimization data and evaluate the kinematic performance of the optimized double wishbone suspension. After the optimization, four suspension kinematic parameters change range are basically within the ideal range. This optimization has achieved the excellent results, and at the same time, it provides ideas and reference significance for the optimization of other types of suspensions.
Research on Dynamic Characteristics Analysis Method of Rotary Drilling Rig Mast
Authors: Wang Yongquan , Wu Hongen , Yu Xiaoqing , Guo Haiyong
Published: May 2024

Aiming at the problem that the methods in the field of rotary drilling rig mast dynamic characteristic analysis are limited to theoretical modal analysis, this paper carries out theoretical modal analysis of rotary drilling rig mast and verifies the results by experimental modal analysis methods. Firstly, the theoretical modal analysis of the drilling rig mast was carried out by using ANSYS analysis module to obtain its intrinsic frequency and vibration pattern, and determine the main deformation modes. Subsequently, the experimental modal analysis based on the Cov-SSI algorithm was used to obtain the modal frequencies of each order of the rig mast. Afterwards, the steady state diagram was used to distinguish the pseudo-modes and physical modes of the rig mast, and the modal ordering was completed. Finally, the experimental modal analysis results are compared with the finite element theoretical modal analysis results to verify the correctness of the theoretical modal analysis results, provide experimental data support for the theoretical modal analysis, and fill the gap in the field of experimental modal analysis.
Study on the Impact Damage Characteristics of the Middle Slot of the Scraper Conveyor
Authors: Zhang Qiang , Liu Yang , Wang Cong , Wang Gangcai , Ma Yanzong
Published: May 2024

The scraper conveyor is vital for mine production but is susceptible to impact damage from falling coal during shearing. However, scholars have conducted limited research on wear patterns in the middle trough of scraper conveyors. This paper began by modeling and assembling the SGZ630/220 double-chain scraper conveyor. We then used the wear depth of the middle trough as a measurement parameter and employed EDEM software to study the impact wear patterns in the middle trough during coal transport under different working conditions, including lateral incline angle (5°, 0°, -5°), forward incline angle (5°, 0°, -5°), chain spacing (110mm, 320mm, 450mm), and particle size (20mm, 30mm, 40mm). The simulation demonstrated that adjusting the laying angle, reducing chain spacing, and optimizing coal particle size effectively minimize impact damage to the middle trough. These findings hold paramount importance for retrofitting scraper conveyors, enhancing their operational longevity.
Dynamic Analysis of Two-Point Drive Scraper Conveyor
Authors: Tian Ying , Ma Shouxiang , Yang Wenlong
Published: May 2024

Coal, as one of the important energy resources, plays a significant role in China’s energy supply and development. In order to better understand the operational characteristics and performance of a scraper conveyor, this article uses ADAMS software to simulate and analyze the dynamic characteristics and mechanical characteristics of a two-point drive scraper conveyor during startup. The torque of the sprocket shaft and the force curve of the round chain when the two-point drive conveyor starts are obtained, providing scientific references and basis for further optimal design and performance improvement of the scraper conveyor.
Analysis of Positive Pressure Characteristics in Transition Section of the Pipe Belt Conveyor
Authors: Hao Nini , Yi Xiaoting , Zhang Yuan , Wang Xingyu , Sun Xinming , Sun Changzheng , Zhang Mengchao
Published: May 2024

The pipe belt conveyor is a kind of mechanical equipment widely used in the field of material transportation. The stable operation of the transition section plays an important role in material transportation. It is of great significance to study the positive pressure of the roller to improve the stability of the transition section. Firstly, the calculation formulas of the positive pressure of the hexagon roller group, the pentagon roller group and the groove roller group are deduced theoretically. Then, the positive pressure of the transition section is simulated to verify the accuracy of the formula. The results show that the positive pressure is the largest when the transition section is just rolled into a circular pipe, and the edge along the width direction is less stressed than the middle, which provides a reference for the stability study of the transition section of the pipe belt conveyor.
The Influence of a Novel Air Column Regulating Device on the Separation Performance of Hydrocyclones
Authors: Zhang Baoling , Tian Shubing , Hao Yongkang , Liu Peikun , Li Xiaoyu
Published: May 2024

Hydrocyclones are the irreplaceable separation device in the industry. However, in the process of using, the hydrocyclone has an air column, which reduce the separation efficiency. In this study, a novel air column regulating device was designed to enhance the stability of the air column during hydrocyclone operation and minimize its impact on the separation performance. A comparative study of the flow field characteristics between traditional hydrocyclones and hydrocyclones with the novel air column regulating device was carried out by numerical simulation. The novel air column regulating device could effectively reduce the air column diameter within the hydrocyclone, resulting in lower pressure loss and higher tangential velocity compared to traditional hydrocyclones. Thus, the separation efficiency could be further improved.
Dynamic Characteristics and Experimental Study of Rail Belt Conveyor Operation Process
Authors: Shi Hao , Li Zhengli , Liu Jinshan , Sun Changzheng , Jia Xianghui , Hou Yupeng
Published: May 2024

Based on the wheel-rail belt conveyor of a new type of mining machinery conveying equipment as the research object, the mechanical properties of the operation process are studied. The differential motion equation between the trolley and the track was established by using D’Alembert’s principle, and the dynamic simulation analysis was carried out by Recurdyn to obtain the contact force between the trolley and the track during operation. The static analysis of the bracket, track and slewing part was carried out with COMSOL to explore the weak position of the overall structure. Finally, the dynamic simulation and static analysis are compared with experiments to verify the feasibility of the theory and simulation. The results show that the contact force of the trolley on the upper track is significantly greater than that of the lower track, and the trolley has a large impact force in the in-and out slewing part, which is the main component that generates noise. The position of the carrier at the seams of the rails, the connection between the track and the bracket, and the position of the inlet and exit slewing part are the places where the maximum stress occurs.
Effect of Cylindrical Height of a Hydrocyclone for the Flow Field and Separation Performance
Authors: Zhang Yuekan , Zhang Qingyun , Xu Mingyuan , Hu Wei , Xu Xiangxi
Published: May 2024

This paper investigates the influence of cylindrical height of a hydrocyclone for the separation performance and flow field utilizing RSM turbulence model, VOF and Mixture model. The VOF model’s prediction results indicate that under the same feeding conditions, The air column stability time and diameter gradually increase when the cylindrical height increases, and increasing the height of cylinder can reduce the static pressure and pressure drop, thereby increasing the treatment capacity and reducing energy consumption; at the same time, with the height of the cylinder increases, the peak tangential velocity of the column section decreases; the peak tangential velocity of the conical section is the largest when L=1.5D, which is beneficial to improving the hydrocyclone’s separation performance. The prediction results of the MIXTURE model suggested that: when the hydrocyclone is used for fine particle grading operation, an appropriate column height of L=1.5∼2.0D is recommended; whereas, for coarse particle grading operation, a smaller column height should be considered.
Research on Digging Anchor Parallel Operation Efficient Excavating Technology and Equipment
Authors: Zhu Aixiang , Jia Yongmin , Yin Fenglan
Published: May 2024

For temporary support unreliable form empty homework often cause safety accidents, restricting the construction speed of roadway, the paper introduces a mine roadway comprehensive mechanization digging anchor parallel operation efficient excavation technology and equipment, that has lots of outstanding advantages, such as digging anchor parallel operation, tunnel temporary support mechanization and hydraulic automation, that improves the machine open probability and reduces the labor intensity of workers. The relevant parameters, basic structure and working principle, key technologies of digging anchor parallel operation efficient excavating equipment were illuminated detailedly in this paper.
Research on the Control System of an Automatic Pellet Loading Equipment
Authors: Meng Tiansheng , Li Yingjun , Wang Guicong , Meng Xiangzhou
Published: May 2024

With the development of various detection sensors, more and more physical quantities can be digitised through sensors. Through the reasonable use of various sensors, motors and control chips, the control system of various equipment is more and more perfect. This paper is based on 51 microcontroller control system design and HMI serial touch screen interface design of a particle automatic loading equipment, and through the Protues simulation experiments. Through the design of the control system, it can provide a feasible programme for the automatic control of the automatic loading equipment.
Mining Vibrating Screen Modal Analysis
Authors: Zhu Lijun , Wu Guangliang , Yang Zhenwei , Zhang Kuoyue
Published: May 2024

Coal is the main source of energy in China, and coal washing and processing can reduce the impurities in coal, which is particularly important for environmental protection and efficient utilization of coal. Mining vibrating screen in the coal selection process plays an important role, due to the harsh working environment of the coal plant, the work intensity is large, making the mining vibrating screen is very easy to fail, resulting in huge economic losses, which can cause serious injuries. Therefore, the monitoring and diagnosis of mining vibrating screen failure research is of great significance. In this paper, the mining vibrating screen SOLIDWORKS three-dimensional modeling, the use of ANSYS software for modal analysis, through the modal analysis, the mining vibrating screen to get the first 12 orders of modes, to determine the mining vibrating screen in the first 12 orders of modal vibration under the intrinsic frequency and intrinsic vibration pattern, for the mining vibrating screen research provides an important basis.
Study on Automatic Locking System of Explosion-Proof Cover of Fan in Coal Mine
Authors: Tian Ying , Wang Gangcai , Zhang Hezhe , Liu Yang , Ma Yanzong
Published: May 2024

Explosion-proof cover locking system is an important part of explosion-proof cover work. The existing platen type air back locking system has some problems, such as manual operation, complicated steps and long time. In this paper, the mechanical structure of the automatic locking system of explosion-proof cover is studied by analyzing the requirement of the system. Through the finite element analysis of the box, it is proved that the designed box structure and strength meet the requirements. The system control program is designed to realize the function of automatic locking of explosion-proof cover, improve efficiency and reduce the probability of workers being injured.
Research on High-Altitude Estimation Method Based on Fusion of Semantic Information with ElasticFusion
Authors: Lu Qinghua , Zhang Guanhong , Mao Xueqian , Xu Xia
Published: May 2024

In the context of autonomous exploration and real-time 3D reconstruction in complex indoor environments for quadruped robots, the accurate extraction of elevation information in different terrains is a crucial technology. Currently, in elevation estimation solutions that utilize visual sensors, directly processing dense point cloud map data results in a massive computational load, which is not suitable for robot navigation applications. On the other hand, using 2D occupancy grid maps, while having a smaller data scale, struggles to accurately represent complex terrain features and limits the robot’s autonomy when exploring unknown environments.In this article, addressing the elevation estimation problem in complex indoor terrain environments within buildings, we employ the ElasticFusion SLAM (Simultaneous Localization and Mapping) approach for real-time, high-quality 3D reconstruction and localization. We then process and analyze the reconstructed point cloud map to identify terrain features such as steps, stairs, obstacles, etc. Furthermore, by processing the point cloud information, we extract accurate semantic information. This information serves as the basis for obtaining local elevation data, enabling quadruped robots to create dense maps in a global terrain context and make judgments by integrating semantic information with real-time local elevation data. This facilitates backend decision-making and allows robots to autonomously perform tasks such as crossing thresholds, crawling, climbing stairs, and maneuvering around obstacles. These capabilities provide essential data support for quadruped robots to autonomously navigate and explore dynamic indoor unfamiliar environments in the future.
Parametric Research on the Mechanophysical Properties of Coconut Leaves
Authors: Li Zunxiang , Huang Xiaohong , Jiao Jing , Wu Yi , Liu Xinpeng , Du Jihua , Zheng Jing
Published: May 2024

Research on the mechanophysical properties of naturally shedding coconut leaves has been carried out, which is expected to provide basic theoretical support for the design of key components of the coconut leaves harvester and the determination of operating parameters. The moisture content of “Hainan coconut” was determined to be 68.67 by using a DGF101-1ES electric blast drying oven; Using the weighing method, the density of “Hainan coconut” was measured as 0.8742g/cm3; Through the UTM6503 electronic universal testing machine, three different loading speeds of 5mm/min, 10 mm/min, and 20 mm/min were used respectively, and the compression characteristic parameters of coconut leaves were tested and obtained. Supplemented by theoretical calculations, it was concluded that when the length of the sample was 20mm, the average axial compression modulus and compressive strength of coconut leaves increased with the increase of the loading speed; the average maximum force decreased first and then increased as the loading speed increased. When the length of the sample was 30mm, the average values of the axial compression modulus, compressive strength and maximum force of coconut leaves decreased first and then increased as the loading speed increased; when the loading speed reached 10mm/min, the minimum value of all three shown.
Research on the Third Order Sliding Mode Tracking Control of Unmanned Aircraft Pitch Angle
Authors: Li Hui , Li Heng , Lei Junwei
Published: May 2024

This article focuses on the simplified model of attitude stability in the pitch channel of unmanned aerial vehicles, and designs a nonlinear integral sliding surface based on the pitch attitude angle error. Then, the derivative is obtained based on the nonlinear integral type sliding mode surface, and a third order sliding mode reaching law is designed. The Lyapunov function is selected to ensure the reachability of the sliding mode surface. Based on the sliding mode surface, a new type of integral type nonlinear Lyapunov function is selected. After solving its derivation, the stability of the sliding mode surface is proved according to the Lyapunov stability theorem, thereby ensuring that the pitch angle error signal tends to zero and achieving pitch angle stability and tracking of the aircraft. Finally, its stability was verified through simulation analysis.
Research on Interference Observation and Tracking Control of Pitch Angle for Unmanned Aircraft
Authors: Lei Junwei , Cong Xiao , Li Heng
Published: May 2024

This article focuses on the design of linear and nonlinear disturbance observers for the disturbance term of the attitude angular rate submodel of the simplified model of attitude stability in the pitch channel of unmanned aircraft. and the disadvantages of engineering implementation of nonlinear disturbance observers is analyzed. On this basis, a disturbance observation tracking controller for the pitch attitude angle was designed through nonlinear equivalent control and state feedback. By selecting the hurwitz coefficients of the controller , the stability of the system was ensured. And through simulation analysis in four cases: with integration, without integration, with perturbation of system parameters, and with completely unknown system model, it is shown that the proposed method can estimate interference to a certain extent, but there is a static error in the case of unknown model. At the same time, the proposed method can reduce control gain and increase stability margin compared to traditional PID control.
A Method for Extracting Low Speed Rotor Position of PMSM by Inject High Frequency Square Wave Voltage in Synchronous Rotating Coordinate System
Authors: Zhang Ying , Li Yaoheng , Chen Jiayang , Zhao Xinzhe , Guo Keyu , Zheng Yangjun
Published: May 2024

Generally studied extraction methods of rotor position in low speed condition usually superimpose high frequency rotary sinusoidal voltage or pulse sinusoidal voltage on the fundamental signal. These two methods need to process the response current obtained by the high frequency voltage excitation through the band-pass filter(BPF) and the low-pass filter (HPF). The use of filters can cause time delay, reduce the highest frequency range that can be transmitted between the input and output signals of the control system. As a result, the extracted low speed rotor position lags behind the rotor position information detected by the actual position sensor. Thereby affecting the control system dynamic response speed. To avoid this impact, it is considered to replace high frequency rotary sinusoidal voltage or pulse sinusoidal voltage form with the square wave voltage form to extract information at low speed condition. This avoids the use of filters with its unique signal extraction method. A simulation model is established to test the effect of rotor position extraction algorithm after replacing the voltage form. Analysis of simulation results prove that the proposed method can converge in a short time and narrow the lag and value error between the rotor position information detected by the actual position sensor and the extracted low speed rotor position.
Numerical Study on the Spray Performance of the Nozzle Used for Sludge Drying
Authors: Hao Yongkang , Tian Shubing , Zhang Baoling , Wang Fuyao , Liu Peikun , Li Xiaoyu
Published: May 2024

Reducing the particle size of sludge is beneficial to improve the drying efficiency. In this paper, the spray method was introduced to the sludge drying process, and a new type of jet nozzle for sludge spray drying was designed. The effect of the structure parameters of the nozzle on the spray field at the nozzle outlet was discussed by numerical simulation. The crushing and drying effects of the sludge were improved by optimizing and improving the nozzle spray field. The results show that the pressure inside the nozzle and cylinder decreases with the increase of spray angle. The larger the spray angle, the smaller the maximum speed of air ejection from the nozzle and the wider the ejection width. The research results can provide theoretical support for the optimization design of the sludge spray drying process and have certain engineering significance and practical value.
Numerical Simulation of the Separation Performance of a New Type of Two-Stage Column-Cone Hydrocyclone Based on CFD
Authors: Xu Xiangxi , Liu Peikun , Zhang Yuekan , Hu Wei , Zhang Qingyun
Published: May 2024

In order to further improve the separation performance of the hydrocyclone. This paper breaks through the traditional column-cone structure, proposed a new type of two-stage column-cone hydrocyclone, using numerical simulation method to study the flow field and separation performance of the new type of two-stage column-cone hydrocyclone with a cylinder diameter of 75mm. It was found that: the static pressure at the hydrocyclone wall increased by 11%, which improved the processing capacity of the hydrocyclone; the extreme value of the tangential velocity at the characteristic height of the cone section increased by 4.28 m/s, which increased the centrifugal strength of the particles and facilitated the migration of particles from the inner to the outer hydrocyclone; the axial velocities in the inner and outer hydrocyclone were increased, which reduced the residence time of the particles and the insufficient separation of the particles; and the new type of two-stage column-cone hydrocyclone further improves the separation performance of the hydrocyclone, improves the particle classification efficiency of the hydrocyclone, and reduces the separation particle size of the hydrocyclone.
Biocontrol of common scab in potato cultivation
Authors: Dzedaev Hetag Totrazovich , Gazdanova Irina , Revazova Zarina , Bekmurzov Batraz
Published: May 2024

An assessment was made of the phytosanitary condition and yield of potatoes when treating tubers with biological fungicides in the Republic of North Ossetia – Alania. Preliminary conclusions have been made about a reduction in the development of tuber infections and an increase in potato yields under the influence of tested biological products. The use of biological control agents increases the biological activity of phytopathogenic organisms by introducing a competitor or inhibitor. This includes reducing the use of chemical pesticides in food production, as well as increasing the sustainability of production areas by increasing microbial populations, reducing production costs and stimulating plant growth. Bacillus subtilis is the most studied microorganism in agriculture for the control of plant diseases. The effect of treating tubers and spraying plants with biological preparations “BisolbiSan”, “Fitodok” and “Baktofit” on the infection of potato tubers with Streptomyces scabies. Was studied in 2021–2023. “Sinkler SK“ was used as the standard fungicide. Scientific novelty is that biological preparations showed excellent field performance against common scab in the foothill zone of RNO-Alania. Therefore, the objective of our study was to evaluate the effect of biological agents in the control of common scab. The tasks included obtaining data on the effects of tuber dressing and spraying plants with biopreparations on potato scab infestation during the vegetation period.The tasks included obtaining data on the effects of tuber dressing and spraying plants with biopreparations on potato scab infestation during the vegetation period. Research were carried out according to the methods accepted in potato breeding according to the recommendations of VNIIKH, VIR and VIZR. The results obtained in field experiments show that in all four years of research these preparations significantly reduced the infestation of tubers with Streptomyces scabies “BisolbiSan” biopreparation, which was used for tuber dressing and spraying of plants four times during the growing season, showed the best protective effect against Streptomyces scabies.
The effectiveness of the use of quercetin on the biochemical parameters of the carcass of Arbor Acres broiler chickens
Authors: KURILKINA M. Ya. , Rahmatullin Shamil' Gafiullovich , Duskaev Galimzhan
Published: May 2024

The purpose of the study was to evaluate the effect of quercetin on the biochemical composition of the carcass of broiler chickens. Methods. The studies were carried out on 100 heads of 7-day-old broiler chickens (cross Arbor Acres, 4 groups, n = 25). Experimental scheme: control group – basic diet (RR); I experienced (OR + quercetin at a dose of 5 mg/kg feed/day); II experimental (OR + quercetin at a dose of 10 mg/kg feed/day); III experimental (OR + quercetin at a dose of 15 mg/kg feed/day). The scientific novelty lies in the fact that for the first time the influence of the use of small molecules of plant origin: quercetin dihydrate on the biochemical composition of muscle tissue and liver of broiler chickens was studied. Results. It was established that the amino acid composition of the muscle tissue of the experimental bird was distinguished by a higher content of: lysine, phenylalanine, leucine-isoleucine, methionine, proline, alanine and glycine in groups I and III (pectoral muscles), as well as a high content of histidine, proline in group III (thigh muscles). In the liver of the experimental groups, an increase in the content of: lysine, tyrosine, phenylalanine, histidine, leucine-isoleucine, valine, proline, alanine and glycine was found. An increase in the concentration of fatty acids in the pectoral muscles was also found: palmitoleic (group III), stearic and linolenic (group II), arachidonic (groups I and III), in the femoral muscles: linolenic (groups I and II), with a decrease in palmitic, palmitoleic (I group) and arachidonic (I–III groups). In the liver tissue, a decrease in the content of palmitoleic (groups I–III), oleic (group III), and an increase in palmitic (group III), linolenic (groups I–III) was recorded. The introduction of the tested herbal preparation into the diet had an ambiguous effect on the mineral profile of the muscles and liver of experimental chickens, which manifested itself in the form of an increase in the level of individual elements with a significant decrease in others.
Factors of competitiveness of Russian grain on the world market and prospects for the development of grain farming in the context of increasing export potential
Authors: Zyukin D.
Published: May 2024

The article analyzes the domestic and export prices for grain in Russia, as well as the analysis of world prices among the top-7 leaders in terms of wheat supplies in the period from 2017 to 2021. The purpose of the study is to study the internal factors of the competitiveness of Russian grain on the world market and search for opportunities to increase the export potential of Russia as an element of the rehabilitation of domestic grain market and incentive to increase the volume of grain production. Methodology and methods. The author conducts a study of changes in export volumes in comparison with gross grain collections, analyzes the ratio of export prices for non-CIS countries and CIS countries in comparison with actual domestic prices, provides a comparison of prices among the largest grain-producing regions. Results. The article notes that price is an important factor in the competitiveness of Russian grain exports, ensuring its availability in countries with limited economic opportunities.. It is noted that in the period under study, domestic prices are growing elastically at the level of world prices, which limits the margin for grain exports from regions remote from ports, however, price increases create incentives for grain producers to increase grain yields, including through increased intensification. To further increase the export potential, the article recommends specifying the mechanisms of the grain damper in the direction of increasing targeted support for direct grain producers and creating conditions for reducing transaction costs as a way to ensure a competitive price of Russian grain on the world market. The scientific novelty it consists in the positioning of the price as a fundamental factor of the competitiveness of Russian grain on the world market, which forms a high export potential and allows it to be used as a tool for the rehabilitation of the domestic grain market, providing favorable price conditions and efficiency to grain-growing organizations and stimulating the increase in grain yields in the regions of Russia.
Formulation and Evaluation of Anti-acne Niosomal Gel Using Isotretinoin and Lincomycin Combination
Authors: Sharma Arushi , Kumar Rajesh , Singh Ajeet Pal , Singh Amar Pal
Published: May 2024

Acne vulgaris is a prevalent dermatological concern affecting adolescents and young adults, often causing psychological distress and potential scarring. This multifactorial disorder involves hormonal changes, increased sebum production, bacterial colonization, and inflammation. To address these diverse factors, a combination of drugs with different mechanisms of action in topical formulations has been explored.
This study focuses on the formulation and evaluation of an anti-acne niosomal gel incorporating isotretinoin, a retinoid with anti-inflammatory properties, and lincomycin, an antibiotic targeting Propionibacterium acne. The objective is to develop a stable and efficacious topical formulation that comprehensively addresses the various aspects of acne pathogenesis. Niosomes are chosen as the carrier system for their ability to enhance drug penetration, reduce side effects, and improve drug stability.
Several studies have highlighted the synergistic action of isotretinoin and lincomycin, providing a comprehensive approach to managing acne lesions by addressing both inflammatory and bacterial components. Moreover, their combination has shown a reduced risk of antibiotic resistance compared to monotherapy with antibiotics.
The research involves a systematic evaluation of the formulated niosomal gel, including physicochemical characteristics, in vitro release, and stability studies. By adopting a topical approach, the study aims to minimize systemic side effects and enhance drug delivery to the target site, ensuring localized and effective treatment. The outcomes of this study are anticipated to contribute valuable insights into the potential of an isotretinoin and lincomycin combination in a topical niosomal gel for the advanced and effective treatment of acne vulgaris.
Keywords: Acne vulgaris, Isotretinoin, Lincomycin, Topical formulation, Niosomes, Multifactorial acne treatment.
Local communities and tourism during the recovery period after the COVID-19 pandemic
Authors: Zinchenko V. A. , Rashkovska I. V.
Published: May 2024

The purpose of the article is to study the influence of local communities on the development of tourism in Ukraine during the recovery period after the COVID-19 epidemic, taking into account the territorial specificity and European experience. The methodological basis of this study is statistical, comparative, graphic, systematic methods of analysis, economic modeling based on statistical data of recent years, analysis and synthesis of optimal theoretical data, induction and deduction of collected information. Scientific novely. It was determined that the global pandemic of the COVID-19 coronavirus had a significant impact on the rethinking of the activities of local authorities and, in particular, on their impact on tourism. A significant feature of the study is that it is based on the activities of the Novosanzhar settlement territorial community, which in 2020 received citizens who arrived from China, the actual epicenter of the coronavirus. Conclusions. It is emphasized that the reforming of the authorities of local communities, which has been carried out in Ukraine since the moment of its European integration, provides an opportunity to expand their powers and implement them in a much wider range of issues, among which tourism occupies far from the last place. It is he, as a unique phenomenon of the end of the 20th – beginning of the 21st century, that actualizes the needs of society in its moral and ethical questions, on the one hand, and on the other – provides new opportunities for employment of citizens and raising the economic level. The results of determining the optimal ways of interaction of local communities and the functioning of tourism in its various manifestations, from local history forms to international business projects aimed at replenishing the budget and popularizing Ukraine in its tourism opportunities, are presented. The work developed recommendations for increasing the effectiveness of the interaction of local communities and their tourism component, in particular, the author’s vision of solving the problems existing in this process was formed and the elements of designing ways to improve the partnership of the authorities and subjects of tourism activity were presented.