Hydroponic lettuce was prone to pest and disease problems after transplantation. Manual identification of the current growth status each hydroponic not only consumed time errors but also failed meet requirements high-quality efficient cultivation. In response this issue, paper proposed a method called YOLO-EfficientNet for identifying lettuce. Firstly, video data were processed obtain individual frame images. And 2240 images selected from these frames as image dataset A. Secondly, YOLO-v8n...

Abstract The reliability of the shifting mechanism is crucial for comfort and stability heavy-duty commercial vehicles. How to reduce local deformation maximum stress through structural optimization key improving service life vehicle devices. To improve fracture problem shift forks, a topology method based on finite element analysis was applied. results serve as constraints design, optimizing areas that are difficult manufacture produce better structures. This mainly three judgment...

In order to improve the control effect of each environmental factor conventinal glasshouse, a realistic nonlinear glasshouse system feedback linearization decoupling arithmetic has been reported. The multi-input, multi-output which is turned into two detached single-input, single-transport stepwise linear systems by implementing encoder algorithm, and relation ambient components, strong coupling, such as temperature humidity, alleviated. simulation results show that if target value within...

Excess water seriously affects the performance and lifetime of proton exchange membrane fuel cells (PEMFCs). This study proposes a novel compound flow field, which is named active drainage field (ADFF). The new design enhances by under-ribs flow, while output very close to that conventional serpentine (CSFF). Additionally, ADFF bipolar plate has been taken as cathode retaining CSFF an anode; combination shows good under high relative humidity. peak power density reached 0.59 W/cm2, 13%...

When cleaning the surface of a glass greenhouse, washing machine often encounters slippery tracks or strong winds, in which case is very likely to deviate from axis greenhouse. In order improve stability and reliability greenhouse cleaner under different working conditions, this paper studies controller puts forward fuzzy PID control scheme optimized by PSO algorithm. Using Adams Matlab jointly simulate model, results show that particle swarm has best effect can make adaptable variety...

In order to address the time-consuming and labor-intensive challenges as well suboptimal operational quality encountered in conventional processes of fruit bagging within expansive orchards, an innovative end-of-bagging actuator is proposed, which can be installed on a fruit-production robot. Due excessive power sources required complete operation, while also taking into account cost end effector, we have implemented clutch transmission system control individual motors, thereby achieving...

Abstract The oceans occupy nearly 71% of the Earth’s surface area. ocean is rich in energy, and wave energy one its important components. Therefore, study generation devices an issue. In this paper, we analyze effect size air chamber structure on OWC (oscillating water column) conversion device under action unidirectional regular waves. To performance real sea conditions, climate at Sanmenxia used as experimental parameter. characteristic response with variation incident height, width front...

In order to grasp the particle flow characteristics and energy consumption of industrial fluidized spouted beds, we conduct numerical simulations on basis a Computational Particle Fluid Dynamics (CPFD) approach. particular, traction model Wen-Yu-Ergun is used different inlet conditions are considered. Using low-speed fluidizing gas, state particles better amount accumulated at bottom bed wall becomes smaller. For same air intake, loss circular nozzle larger than that square nozzle.

Sowing accuracy is a critical factor in evaluating the precision of sowing equipment, and rate equipment developed at home abroad cannot reach 100 %, so this paper designs seed reseeding device, aiming to improve secondly. Firstly, structural composition device introduced; secondly, according production object selected paper, kale (Jingfeng No.1), best combination factors levels suction nozzle 8 m/s inlet speed, 1.8 mm aperture, 18 lead V-shaped by using orthogonal experiment; then, EDEM...

In this paper, a method to improve the performance of PEMFCs using porous material as flow channel baffle is proposed. The results show that with four baffles channels have better at high current density compared traditional channel. structural parameters explored in study include porosity, thickness and number baffles, their influence on PEMFCs. Sensitivity analysis most sensitive thickness, could be appropriately adjusted. plates porosity are adjusted

Abstract The glass greenhouse roof cleaning machine is driven by dual motors, and there are problems with deflection inconsistent speed of the two wheels during operation, to solve these problems, a joint simulation method based on Adams Matlab used in this project. Firstly, build detailed 3D models using SolidWorks software software, set necessary constraints material properties for models; then, control system modeled Fuzzy-Proportion Integration Differentiation (PID) algorithm...

As the most advanced vegetable cultivation technology adopted all over world, tray seedling is key link of vegetables to increase crop yield and economic benefit. whole production process, precision seedlings directly related survival rate seeds. Combining small scale domestic industry, low level mechanization, profit sowing equipment, a seeder proposed in this paper ADAMS software used carry out dynamic analysis on main stressed parts. The results showed possible problems design type...

A computational study of the stretching mechanism a liquid bridge and effect properties on DPN (dip-pen nanolithography) process is presented. The results show that viscosity contact angle can have an appreciable influence these processes. greater viscosity, harder to break, which allows more molecular transfer during spotting process. Besides, when between substrate less than 60 degrees, time required stretch break it grows with angle. During process, pressure in midsection (along vertical...

Water management in proton exchange membrane fuel cells (PEMFC) is a topic of great importance for the optimization these systems. Effective conductivity calls moderate moisture content membrane, while uneven water distribution can lead to instability whole flow field, thereby decreasing performance cell. In present study, simplified two-tier hybrid structure used investigate impact dynamic behavior liquid on current density PEMFC. Simulation results show that droplets attached wall sides...

Graphite is expected to be a common choice for basic microelectromechanical-system (MEMS) material in the future. However, order become MEMS material, it very important graphite adapted commonly-used micro-/nanoprocessing technology. Therefore, this paper used directly lithography and etching process study micro-, /nanoprocessing on graphite. The results show that surface suitable lithography, different shapes sizes of photoresist patterns can fabricated surface. In addition, micro-meter...

To address the issues of existing dry granulation process, which mostly relies on manual adjustments based empirical experience and lacks analysis theoretical data, a simplified model tablet pressing modified Drucker–Prager Cap (DPC) material constitutive was proposed to simulate analyze forming process tablets, study impacts feeding speed, roller friction coefficient clearance density distribution pressed tablets via ABAQUS. The results show that speed significantly lower higher are...

Abstract A three-dimensional two-phase mathematical model is used to investigate the entry conditions effects on performance of proton exchange membrane fuel cells (PEMFC) with an interdigitated flow field. Analogy parallel and serpentine fields, better than other two in comprehensive, should be preferred. Comparison different relate humidity (RH) indicates that RH significantly affect cell performance, while cathode more. Current density increases increased hydrogen 100%, however, slightly...

In developing a proton exchange membrane fuel cell, high current density is encountered, thus requiring novel flow field with great drainage performance. Our previous study proposed compound called an active three inlets, which has excellent output and Furthermore, the influence of muti-inlet reactant gas allocation on inlets discussed in this study. The results showed that small mass (AD) channel causes waste area, while large AD under-ribs convection. Considering performance, 15% case...