To adapt to the diversity of hybrid rice and meet its requirements precision seeding, a pneumatic seeder with adjustable seeding rates was designed in this study. The employed an independent vortex pump provide air source for seed metering device. According flow device, sub-pipeline general pipeline were designed. performances two types pipelines verified by pressure uniformity tests. results s...

This study is aimed at the special working conditions of seeding on sloping land, combining advanced precision technology and structure rotary hole filling corn metering device seed rowers home abroad, studying soil entry characteristics, characteristics particles transport pattern in puncture process, order to improve dispersal qualified index reduce coefficient variation process seeding. The ...

Specific-purpose microfluidic devices have had considerable impact on the biological and chemical sciences, yet their use has largely remained limited to specialized laboratories. Here we present a general-purpose software-programmable microfluidic device which is capable of performing a multitude of lowand high-level functions without requiring any hardware modifications. To demonstrate the ap...

The pressurized metered-dose inhaler (pMDI) was introduced to deliver asthma medications in a convenient and reliable multi-dose presentation. The key components of the pMDI device (propellants, formulation, metering valve, and actuator) all play roles in the formation of the spray, and in determining drug delivery to the lungs. Hence the opportunity exists to design a pMDI product by adjusting...

Aiming at the lack of accurate and reliable discrete element simulation parameters for design buckwheat metering devices seeders based on method, an seed model was obtained by calibrating parameters. In this study, particle models were established manual automatic filling methods. order to improve accuracy models, calibrated, static cylinder-lifting test dynamic seed-metering used verify result...

High crop production with limited energy resources is always the priority area of developing countries. Conventional agricultural experimenting and methods are time-consuming, challenging, laborious, intensive. Various developments experimental studies have been carried out for advancement in agriculture technologies. This study mainly focused on design development a unique high-efficiency seed...

The Multi-Center Traffic Management Advisor (McTMA) is a research prototype system which seeks to bring time-based metering into the mainstream of air traffic control (ATC) operations. Time-based metering is an efficient alternative to traditional air traffic management techniques such as distance-based spacing (miles-in-trail spacing) and managed arrival reservoirs (airborne holding). While ti...