Anaerobic digestion technology mitigates agricultural organic waste pollution, thereby alleviating the energy crisis. Biochar materials increase utilisation rate of biomass resources and promote enrichment growth microorganisms. is an effective exogenous additive that stabilises anaerobic digestion, improves efficiency gas production. Herein, biochar were prepared from rice straw utilising sequencing batch process. The microstructure was characterised by scanning electron microscopy (SEM)...

A tungsten-rhenium thin film thermocouple is designed and fabricated, depending on the principle of thermal-electric effect caused by high temperature. The characteristics thermocouples in different temperatures are investigated via numerical analysis analog simulation. working mechanism thermo-electric features analyzed simulation results. Then fabricated calibrated. calibration results show that based material achieve ideal static work well practical applications.

Leaf vein drip irrigation emitter is a new type of emitter. The flow channel achieves energy dissipation through diversion, turning, and sudden contraction. In this study, three design schemes (B1, B2, B3) were proposed by optimizing the structure to improve hydraulic performance, feasibility was verified combining them with experiments. results show that index structural optimization designs 0.52, 0.51, 0.50, errors less than 5% compared measured results. Compared original A1 (with 0.53),...

Drip irrigation with a fertilizer application could effectively alleviate the soil pollution caused by excessive phosphorus fertilizer. Phosphate was dissolved in water and produced chemical reaction ions water. The new precipitates were generated, which more severe complex blockage of drip emitters. Songhua River selected as experiment investigated effects three types fertilizers (urea phosphate, UP; potassium dihydrogen PDP; ammonium polyphosphate, APP) concentrations (0.2, 0.3, 0.4 g/L)...

A thermal stress range analysis of tungsten-rhenium thin film thermocouples based on ceramic substrates is presented to analyze the falling off and breakage problems caused by mismatch stresses in (TFTCs) substrate, nano-indentation experiments are done measure calculate compare with simulation results. Optimal design fabrication TFTCs reported. Static high temperature tests carried out, which show optimization can effectively reduce damage mismatch.

The disposal of livestock wastes is an urgent task in China. Compost highly regarded for its ability to treat and protect arable land. In particular, some problems manure cold regions, such as low efficiency because environmental temperature winter, urgently need be solved. order provide valuable composting information the area at temperatures, experiments were carried out with cow corn stalk substrates. properties bacterial community compost samples different stages investigated. electrical...

Agricultural non-point source pollution has become a matter of increasing public concern, and modern agriculture is gradually transforming into agglomeration, so it important to study the influence agricultural agglomeration on coordinate relationship between resources, environment, economic growth for guidance. With focus 89 prefecture-level cities in main production areas Yangtze River basin China, authors analyzed spatial temporal evolution trends from 2000 2020 then empirically tested...

The core component of a properly functioning drip irrigation system is the emitter. Irrigation water containing impurities and sand particles can easily lead to clogging emitter, reducing efficiency system. In this paper, orthogonal tests were used optimize flow channel structure, combined with computational fluid dynamics–discrete element method (CFD-DEM) analyze index particle motion characteristics. Clear short-cycle anticlogging validate results numerical simulation, relationship between...

The research object was a Francis turbine, and the working conditions at 100%, 75%, 50%, 25%, 1% opening were determined by size of guide vane. Large-Eddy Simulation (LES) adopted as turbulence model method to conduct three-dimensional unsteady turbulent numerical simulation entire flow channel situation various parts turbine under different obtained. characteristics each component analyzed, hydraulic performance part evaluated. factors that affected stability turbines identified, their...

The grain size effect is an important factor in determining the material removal behavior of polycrystalline silicon (p-Si). In present study, to improve understanding nanoscale machining p-Si, we performed molecular dynamics simulation nanometric cutting on a p-Si workpiece and discussed subsurface damage formation. results indicate that when polycrystal workpiece, process becomes unstable compared with single crystals. Higher efficiency, less elastic recovery higher frictional coefficient...

Abstract To improve the hydraulic performance of leaf vein drip irrigation emitters, a combination genetic algorithm and numerical simulation was used to investigate characteristics model. The minimal flow index is as optimization objective obtain best design parameters for channel structure. results show that emitter has 0.53, structural loss coefficient 64.5–70.9 under 50 kPa working pressure, with good energy dissipation effect. Among variables, (denoted x ) influenced in following order:...

Simplified syntheses of polymaleimide employing anionic polymerization (from the melt and from solution) metal compound−alcohol initiators such as PbO, SnO, tin bis(2-ethyl hexanoate) in presence tert-butyl benzyl alcohol are presented. The resulting polymers contain a combination C−N- C−C-connected monomers. Preliminary structures were determined using NMR spectroscopy. ratio monomers was determined, percentage C−N-connected monomer units found to vary 40 80%, with higher polymerization....

In order to solve the problem of unmanned aerial vehicle (UAV) tunnel autonomous flight in GPS-Denied environment, this paper designs ultrasonic environment perception system and introduces algorithm three-dimensional (3D) wall-following navigation. Firstly, framework are presented. Then navigation is combined with PID according dynamic model vehicle. Finally, extensive experiments carried out where optimal control parameters obtained. The experimental results indicate that UAV can fly...

A tungsten-rhenium thin film thermocouples is designed and fabricated, the characteristics of in different temperatures are investigated via numerical analysis analog simulation. Protective was presented to prevent from oxidation evaporation TFTCs at high temperature. The experiment shows sensor with protective have an acceptable linearity up 1370K a suitable voltage output can work for half hour 1370K, however without films break after temperature constant 900K.

In this paper, Nano-indentation technology is used to test the mechanical property of tungsten-rhenium thin film, including hardness, elastic modulus and residual stress. The effects different heat treatment temperature substrates on hardness films were studied. We research three which are silicon carbide ceramic, aluminum oxide ceramic zirconium ceramic. Test results show that shows biggest values smallest However, value Besides, has high influence film. And under substrates, film most...

To investigate the clinical application of three-dimensional (3D) radiomics model CT image in diagnosis and identification ureteral calculus phlebolith.Sixty-one cases 61 phlebolith were retrospectively investigated. The enrolled patients randomly categorized into training set (n = 86) testing 36) with a ratio 7 : 3. plain scan images all samples manually segmented by ITK-SNAP software, followed analysis through Analysis Kit software. A total 1316 texture features extracted. Then, maximum...

This paper deals with the problem of area coverage for gas distribution mapping multiple unmanned aerial vehicles. The has included two aspect: 1) allocation multi micro drones; 2) path planning each UAV in subarea. this is based on conditions environment and performance drones: prior concentrations given flight time UAV. In paper, there are twice divisions. First one used to calculate density function by equal grid division method. Other order pertinently complete task function. Thus, we...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Macrocyclic Ligand Constraints upon the Kinetics Complex Formation and Dissociation Metal Ion Exchange. Copper(II) Complexes with Cyclohexanediyl Derivatives Cyclic Tetrathiaether [14]aneS4 in 80% MethanolLuciana Aronne, Qiuyue Yu, L. A. Ochrymowycz, D. B. RorabacherCite this: Inorg. Chem. 1995, 34, 7, 1844–1851Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March...

Focusing on the background of utilizing magnetic compass in air-ground amphibious robot system, this paper explores error compensation process moving ground and air. Based analysis compass, applies ellipsoid fitting algorithm for identification model coefficient thus calibration is realized flight. Finally, through processing three sets data together with comparison traditional empirical Calibration methods, effectiveness proposed method verified.

The tungsten-rhenium thin film thermocouples (TFTCs) sensor is designed and optimized based on mechanical properties analysis, the process optimal experiment shows working hours of TFTCs with increasing from 10 minutes to 300 at 900K, total work time reach 600 a better output voltage when compared our previously published typically type-S wire thermocouple. Nano-indentation numerical analysis was used get make for dimension parameter TFTCs. Heat treatment improve quality, post-processing...

In the robot development, different developers have to realize their specific software architecture and hardware implementation, which leads complexity of system that design is not same, can make a big difference. If want has other functions on basis original robot, it difficult achieve rapid transfer software, in system, need do more cumbersome, repetitive work module etc. This makes development cycle may be very long. ROS provides similar combination Observer mode Mediator communication...