Results 41 to 50 of about 44,519 (152)

Induction and Synchronization of Estrus in Gilts with P.G.600

Scientific Papers Animal Science and Biotechnologies, 2023
Recent developments in understanding the physiological mechanisms of reproduction control can be adapted to swine reproductive management. This article points out the procedures that can be used to induce estrus, in prepubescent and anestrus gilts, and ...
Ion Carabă, Nicolae Păcală, Ada Cean, Marioara Nicula, Liliana Ciochina-Petculescu, Silvia Erina, Cosmin Ganţă   +6 more
doaj  

An Islanding Signal-Based Smooth Transition Control in AC/DC Hybrid Micro-Grids

Applied Sciences, 2019
Smooth transition is one of the most important issues of micro-grids. The resulting transition is much impacted by the state step of the regulator. To suppress this mutation, this paper proposes a smooth transition control based on an islanding signal ...
Zhenghong Chen, Tao Zheng, Chang Liu
doaj   +1 more source

Slotted ALOHA on LoRaWAN-Design, Analysis, and Deployment

Sensors, 2019
LoRaWAN is one of the most promising standards for long-range sensing applications. However, the high number of end devices expected in at-scale deployment, combined with the absence of an effective synchronization scheme, challenge the scalability of ...
Tommaso Polonelli, Davide Brunelli, Achille Marzocchi, Luca Benini   +3 more
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Pre-synchronization Control Strategy for Grid Connection of GFM Converter Based on LADRC

Science and Technology for Energy Transition
The grid-forming (GFM) converter simulates the rotor characteristics of a synchronous motor through the application of the virtual synchronous generator control (VSG), providing crucial inertia and damping support for the grid connection of distributed generation (DG). However, in the island mode, when the DG is closed and connected to the grid, due to
Minxiao Han, Wenqiang Xie, zhixiang wang, Mingqi Xia, Luo Tian   +4 more
openaire   +1 more source

Effect of oestrus expression and eCG treatment on reproductive performance in dairy cows subjected to Progesterone plus Ovsynch protocol

Revista Científica
The objectives were to evaluate the effects of equine chorionic gonadotropin on oestrus expression and fertility in dairy cows undergoing a timed artificial insemination protocol.
Baris Guner, Melih Erturk, Buse Ozturk, Aslihan Ayalp-Erkan, Mehmet Dursun, Bekir Aydogan   +5 more
doaj   +1 more source

Joint Simulation Research on Drilling String Lifting Device Based on AMESim and ADAMS

Shiyou jixie
As the drilling technology continues to develop， the requirements for conveying efficiency and automation level of drilling tool becomes increasingly high.
Song Binghao, Wang Hanxiang, Zhang Heng, Liu Yanxin, Cai Wenjun, Chen Zhili   +5 more
doaj   +3 more sources

An Adaptive-Feedforward Power Decoupling for Grid-Forming Converters with Pre-Synchronization via Sliding-Mode Control

Energies
The grid-forming (GFM) converter is an effective solution for grid support. However, mode switching failures and power coupling challenges in weak grids pose significant safety risks.
Qicai Ren, Zefeng Xu, Rongcai Pan, Tong Liu, Yanxu Zhang, Chao Sheng   +5 more
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A solution of High-precision WLAN positioning based on TDOA and PTP

MATEC Web of Conferences, 2016
For indoor WLAN positioning it is difficult to achieve decimeter or centimeter-level precision questions, to IEEE1588v2 (PTP) precision network clock synchronization technology and the arrival time difference principle (TDOA), combined with non line of ...
Zhou Junjie, Ke Yue, Yu Kan, Tian Di
doaj   +1 more source

Design of a new type of pre-charge circuit of single-quadrant frequency converter

Gong-kuang zidonghua, 2013
In view of problems of complex structure and control, high cost and big volume of contactor and charging resistance existed in traditional pre-charge circuit of single-quadrant frequency converter, a new type of pre-charge circuit of single-quadrant ...
TANG Bai-shan, HUANG Cui-bai
doaj  

Analysis of Four-Quadrant Control Characteristics and Parameter Design of Inertia Synchronized Three-Phase PWM Converter

Shanghai Jiaotong Daxue xuebao
One of the mainstream schemes for grid-forming control in new energy power generation units is the inertia synchronization control for pulse width modulation (PWM) converters (ISynC-converter).
GUO Ziteng, WANG Han, WANG Fuwen, CAO Yunfeng, ZHANG Jianwen, CAI Xu
doaj   +1 more source