Search all articles

DTA/SDTG and DSC techniques were used to study the thermal behaviors of citronellol- -D-glucopyranoside (CGLY) . The heating rate was 5, 7.5, 10, and 12.5 K min-1, the samples were heated from 30oC to 500oC. Methods of Friedman and Flynn-Wall-Ozawa were applied to calculate the parameters of thermal...

This paper explores the Swarm Drone System (SDS), focusing on core cooperative control technologies (e.g., Boids model, distributed vs. centralized systems) and key applications like aerial detection, reconnaissance, and logistics. Case studies, such as DARPA’s OFFSET project and urban delivery pilots,...

A new linear 10-undecenoic acid-based diol and a chain extenders with 12C dangling chain length were synthesized via thiol-ene coupling and esterification reaction. In order to investigate the effect of the 10-undecenoic acid-based diol chain extender, the mole percent of the 10-undecenoic acid-based...

Path planning technology is the precondition of unmanned aerial vehicle (UAV) airspace safety. For in the running features of the UAV in 3-D space environment, putting forward using fight level (FL) guiding factor to improve the basic ant colony optimization(ACO), which improved the quality and the operation...

In order to implement high precision time synchronization autonomously in the absence of any external time source, in this paper, the author introduced the synchronize model of fireflies into UAV formation network, and proposed a kind of distributed time synchronization methods based on broadcasting,...

This article from the uav model accuracy, real-time and functional aspects of software of software in the loop simulation software based on PC and semi-physical simulation based on the target software research, validation, and verification results are analyzed.

The paper proposes a method to design ANN dynamic inversion controller through online ANN compensating inversion error. It mainly aims at evident shortage of dynamic inversion controller of UAV. A single hidden layer ANN structure is constructed and the stability of the whole closed loop system is proved....

The rigorous requirement for safety, reliability, maintainability, and miniaturization in microminiature unmanned aerial vehicle (UAV) has motivated significant research in new technology. A dual redundant fault-tolerant flight control platform is designed based on the technology of system on a programmable...

Purpose: to discuss the function of polydatin on regulating blood-lipid and anti-atherosclerosis. Method: feed rats with high-fat diet to establish early atherosclerosis model, after the model is established successfully, feed with high, medium and low dose of polydatin (160 80 40mg•kg-1•d-1), 8 weeks...

With the continuous progress of technology, unmanned aerial vehicles(uav) delivery, as a new logistics mode, has gradually attracted people’s attention. Compared with traditional delivery methods, UAV delivery has advantages such as fast speed, low cost, and high flexibility. However, due to many challenges...

To enrich the basic theory of the reductive decomposition process of PG(phosphogypsum), emphasis was laid on the exploration of the impact of the main impurities on the process. Firstly, the simulation computation was done on the systems of pure gypsum mixed with coal with or without impurities under...

Combined with the advantages of infrared image and visible image, this paper proposes a multi-modal data fusion method for detecting the wire strand defects. The segmentation performance of UNet model in images with poor illumination conditions is improved; it solves the problem that the contrast between...

Reliable attitude information is desired for navigation and control of rotor unmanned aerial vehicles (UAV). Rotor UAV's attitude can be determined by fusing redundant data from MEMS MARG (Magnetic, Angular Rate, and Gravity) sensors with fusion techniques. The extended Kalman filter (EKF)-based fusion...

Rotor unmanned aerial vehicles (UAV) usually adopt MEMS gyros, accelerometers and magnetometers to determine its navigation attitude. Because a MEMS gyro has a drawback of angle drift, its attitude data is often corrected by the data solved with accelerometers and magnetometers. This paper presents a...

The adsorbent H8Nb22O59•8H2O and its precursor Rb8Nb22O59 were prepared to produce high-purify NaCl. Their characteristics were studied by X-ray diffraction (XRD), thermogravimetric and differential scanning calorimetry (TG-DSC) and scanning electron microscope (SEM). Two main calcinations factors of...

Based on the characteristics of the attitude control system, this paper use the neural network predictive model controller which can identify accurately attitude system and obtain real-time control sequence applied to the controlled object through the model prediction, feedback correction and rolling...

Perfluorinated sulfonic acid ion exchange membrane doped the silicotungstic acid thermal stability and thermal degradation kinetics were studied by means of thermal gravimetric analysis in a nitrogen atmosphere, the heating rate used respectively was 5, 10, 20 and 30 /min. Using the Kissinger, Flynn-Wall-Ozawa,...

Eu3+doped -Bi2MoO6 red uminescent powder is prepared by co-precipitation method in this paper. Structure and constitution of powder samples are examined by DTA-TG, XRD and IR. Results showed that: quadrature phase -Bi2Mo3O12 is achieved when anneal temperature is 800 and pH is below 3; while quadrature...

Multi-rotor UAV attitude system has many characteristics such as multi-input multi-output, strong coupling, fast time-varying and non-linearity. Thus, for multi rotor UAV attitude control system, the classic PID has some shortcomings. In this paper, the fuzzy PID controller is established by using fuzzy...

This paper focuses on the preprocessing method of control points in geometric correction for UAV (Unmanned Aerial Vehicle) remote sensing image. Control points preprocessing refers to find out the calibration points from the selected control points, so as to use the calibration points to fit the geometric...

Laser-motive UAV (unmanned aerial vehicles) is a new concept UAV. Based on analysis of conservation equation of photoelectric conversion irradiated by laser energy, UAV load’s demand for power density and heat convection balance, a model is established to analyze the relationship between UAV maximum...

Cationic starch-based hydrogel was synthesized by simultaneous gamma irradiation of starch (St), acrylamide (AAM), allyl triphenyl phosphonium bromide (APB) and N,N'-methylene bisacrylamide (MBA) as cross-linker in aqueous solution. The molecular mass of the un-grafted AAM/APB copolymer, the cationic...

Five kinds of Brønsted-acidic ionic liquids with different nitrogen-contained chemical groups and different anions were synthesized, and were respectively characterized by nuclear magnetic resonance(NMR), infrared spectrum (IR), electrospray ionization mass spectrum (ESI-MS) and thermogravimetry(TG....

A novel sulfur ion exchange fiber - thiosemicarbazide chelating ion exchange fiber (TSCIEF) was prepared by nucleophilic substitution reaction of chloramethylated polypropylene graft styrene (CPP-g-St) fiber and thiosemicarbazide, using anhydrous ethanol as swelling agent. The structure of TSCIEF was...

efective faults in insulator power equipment can affect transmission equipment's normal operation and electricity consumption in the service area. To reduce or avoid transmission faults caused by defective insulator power equipment failures, structural defects of insula-tors need to be detected....

Based on the enterprise life cycle theory, this study constructs an analytical framework of “stage classification-efficiency measurement-driving mechanism” to investigate the dynamic patterns of innovation efficiency. Using a sample of 74 Chinese civilian UAV enterprises, we apply K-means clustering,...

The petroleum pipeline distribution range of PCOC (Petrochina Changqing Oilfield Company) is wide, with a complex terrain and a difficult task for pipeline patrol and protect, at present mainly adopts manual inspection method, single inspection way cause inspection workload is huge, inspection efficiency...

An autonomous identification and planning system is proposed and a flight platform based on Linux embedded control system is developed for a quadrotor unmanned aerial vehicle (UAV) based on vision. In the process of control, through the Zenmuse X3 camera and the Open CV library for real-time image processing,...

Safety is crucial in the shipping industry, however in the current export container activity there are many factors that can cause an accident. To prevent an accident, regulation play an important role. With regulation, safety can be implemented to decrease the risk. Therefore, IMO has amended the SOLAS's...

3-triethoxysilylpropylamine (KH550) polymer was coated on quartz fibers by a simple dipping process without any complex chemical treatments in order to increase the bonding strength between quartz fibers and boron doped silicone resin matrix. The effect of coating on the interface of quartz fiber reinforced...

Polyurethane prodrugs with different drug contents were synthesized using polycaprolactone, hexamethylene diisocyanate and ciprofloxacin. The thermal analysis of the materials was carried out by DSC and TG. Results showed that the crystallinity of the materials reduced as the drug contents increased...

A novel adsorbent was prepared by grafted the Dibenzo-18-Crown-6-Ether (DB18C6) on D564 resins and characterized by Thermogravimetry (TG) and Fourier Transform Infrared Spectroscopy (FTIR). Adsorption of Sr2+ from aqueous solutions was investigated in batch method as a function of contact time, concentration...

In order to study the pyrolysis process of Ethylene Propylene Diene Monomer (EPDM) insulation material and its compression mechanical behaviour under high strain rates, the thermal stability of EPDM was analysed by TGA in the first place. Based on the TG curve and the thermal degradation temperature,...

Flight state is an important research con-tent of UAV technology, it involves many factors, and simulation is very difficult. Based on the knowledge of relevant mathematical knowledge and flight con-trol theory, a UAV flight control simula-tion method is proposed. The method combining sampling step and...

With microcrystal muscovite (MCM) as the carrier, butyl titanate as the source of titanium, acetic acid as the inhibitors, copper nitrate as dopant, Cu-doped nano-TiO2/MCM composites were prepared by the sol–gel method. Then the composites were calcined at 500 oC for 2 hours. The samples were characterized...

To meet the demand of the UAV flight control and maintenance personnel training simulation, this paper proposes the composition of 3d display control comprehensive training system of an unmanned aerial vehicle (UAV) and its working mode, this paper also expounds the module design of the system, implementation...

The purpose of this study is to construct an improved forest fire detection model to improve the accuracy and real-time performance of UAV fire detection in forest environment. By introducing MobileNetv3 into YOLOv7 as the backbone network, its lightweight and efficient feature extraction capabilities...

A small four-rotor UAV transmission line inspection system is designed, which not only can cruise and avoid obstacles automatically, but also can be controlled with the remote. The system carries out data collection of transmission lines by the camera module, makes use of FPV technology to realize the...

MgAl2O4 spinel, as support of the 10Ni/MgAl2O4 catalyst which used for coke oven gas dry reforming, was prepared by sol-gel, coprecipitation and urea hydrolysis method. The catalysts were prepared by impregnation. The MgAl2O4 and 10Ni/MgAl2O4 were both calcined at 800 oC for 5 h and the samples were...

Nowadays, unmanned aerial vehicles (UAVs), commonly referred to as drones, have attracted a lot of attention from varies fields. In the development of recent years, one of the most noticeable developments is the application of computer vision in drones, which provides key technologies for visual navigation,...

The water rescue operations have always faced numerous challenges, such as complex environments and long response times, while the emergence of intelligent UAV systems has brought new opportunities for water rescue. This article reviews the technologies and applications of intelligent UAV systems in...

Several SO3H-functionalized acidic ionic liquids (ILs) were synthesized by two-step method, using 1, 3-propane sulfone and 1, 4-Butanesultone as raw materials, respectively. It is noteworthy that the ionic liquid using 2-ethyl-4-methylimidazole as source has not been reported. Esterification of 1-butanol...

The varieties and interspecies hybrids of potato selected on the basis of Ural Scientific Research Veterinary Institute Federal State Budgetary Scientific Institution "Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Science" (Ural national research institute of...

This system, centered on the YOLOv8 algorithm and designed for UAV platforms, enables efficient identification and positioning of small-sized, long-distance targets in high-altitude environments, with broad applicability in military reconnaissance, civilian inspections, disaster relief, and other scenarios....

Huangmei cross-stitch is one of the traditional handicrafts of Jingchu area in China. Huangmei cross-stitch, also called shelf cross and cross stitch. Because of its unique artistic style and charming pattern, Huangmei cross-stitch was took to be included in the first batch of National Intangible Cultural...

This paper focuses on the stability of landing gear systems for quadrotor UAVs. As drones are increasingly deployed across diverse applications including precision agriculture, emergency logistics, and infrastructure inspection, landing gear stability becomes critical to ensuring safe and reliable operation...

The organosilicon-acrylic resin/LDHs nanocomposite was prepared from acrylate, organosilicon Mg-Al-AA-LDHs as well as emulsifier etc with emulsion polymerization methods. The samples prepared were characterized by optical , thermal and gas barrier capabilities testing, Results show the samples were nanocomposion...

Rigid polyurethane foams (RPUFs) were prepared by heteroaromatic polyol as the matrix polyol, methylphosphonate (DMMP) was added to improve its flame retardancy, and the relative performances were studied. Thermal stability were measured by dynamic mechanical analysis (DMA) and thermo gravimetric analysis...

The main body of PCOC (Petrochina Changqing Oilfield Company) is in the Ordos Basin, exploration with a total area of about 37 square kilometers, and whose exploration area is highly fragmented. The situation of the pipeline rupture emerge in endlessly as the result of natural conditions and human factors...

Sepiolite as catalyst carrier material, now commonly used in low temperature, for high temperature applications was very rare. ZrO2/sepiolite precursor was prepared by Chemical precipitation method, catalyst coating material was prepared at 600 , the samples were aged at 1000 . The powders with and without...