Facebook's Rohingya case will turn on legal liability

2021 ◽  
Keyword(s):  
Legal Liability ◽  
Content Type ◽  
Turn On

Headline INT: Facebook's Rohingya case will turn on liability

Wideband modeling and transient analysis of sub-module in modular multilevel converter

2017 ◽  
Vol 36 (6) ◽  
pp. 1792-1805 ◽  
Author(s):  
Lei Qi ◽  
Zhiyuan Shen ◽  
Jianjian Gao ◽  
Guoliang Zhao ◽  
Xiang Cui ◽  
...  
Keyword(s):  
Dynamic Testing ◽  
Extraction Procedure ◽  
Model Parameters ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Content Type ◽  
Insulated Gate Bipolar Transistor ◽  
Module Design ◽  
Turn On ◽  
Module Test

Purpose This paper aims to establish the wideband model of a sub-module in a modular multilevel converter (MMC) and analyze the switch transients of the sub-module. Design/methodology/approach The paper builds an MMC sub-module test circuit and conducts dynamic tests both with and without the bypass thyristor. Then, it builds the wideband model of the MMC sub-module and extracts the model parameters. Finally, based on the wideband model, it simulates the switch transients and analyzes the oscillation mechanism. Findings The dynamic testing shows the bypass thyristor will add oscillations during switch transients, especially during the turn-on process. The thyristor acts like a small capacitor and reduces the total capacitor in the turn-on circuit loop, thus causing under-damped oscillations. Originality/value This paper found that the bypass thyristor will influence the MMC sub-module switch transients under certain circumstances. This paper proposes a partial inductance extraction procedure for the MMC sub-module and builds a wideband model of the sub-module. The wideband model is used to analyze and explain the switch transients, and can be further used for insulated gate bipolar transistor switch oscillation inhibition and sub-module design optimization.

A simple turn-on and turn-off angles searching method for copper loss minimization of the switched reluctance motor

2017 ◽  
Vol 36 (4) ◽  
pp. 1059-1074
Author(s):  
Hai-Jin Chen ◽  
Jin-Yang Li
Keyword(s):  
Switched Reluctance Motor ◽  
Loss Minimization ◽  
Content Type ◽  
Switched Reluctance ◽  
Analytical Computation ◽  
Copper Loss ◽  
Turn On ◽  
Reluctance Motor ◽  
On Line ◽  
Optimal Turn

Purpose The purpose of this paper is to present a simple and effective method to search the optimal turn-on and turn-off angles on-line for the control of the switched reluctance motor (SRM). The optimal turn-on and turn-off angles are defined as the ones that can meet torque production requirements with minimum copper loss. Design/methodology/approach The optimal turn-on and turn-off angles are first defined based on the analysis of the SRM losses and torque production principles. Then the algorithm for optimal angles searching is developed, and the searching parameters are determined through analytical computation. The optimal angles are approached on-line with iterative process. Simulation and experiments are finally performed to verify the proposed method. Findings The presented method can meet torque production requirements while copper loss is minimized. The optimal turn-on and turn-off angles are generally approached within five phase cycles for most of the SRM operation modes. Furthermore, the SRM drive system using the presented method exhibits good dynamics during starting and sudden load operations. Practical implications The presented method is simple, and implementation of it is easy. It is an eligible candidate for industrial applications where energy conversion efficiency is crucial. Originality/value The optimal turn-off angle definition that considers both torque production and copper loss minimization is proposed. The turn-on and turn-off angles are searched independently on-line with little SRM geometrical information. The searching steps are derived through analytical computation and qualitative analysis so that both the searching speed and algorithm convergence are balanced.

Sirisena win spells change and challenge for Sri Lanka

2015 ◽  
Keyword(s):  
Prime Minister ◽  
Policy Reform ◽  
The Political ◽  
Potential Game ◽  
Content Type ◽  
Turn On ◽  
Growth Prospects ◽  
Election Results ◽  
Game Changer

Significance Sirisena's victory is a potential game-changer: instead of entrenching the autocratic tendencies of his predecessor Mahinda Rajapaksa's administration, the election results hold out the promise of democratic consolidation under a new government with a robust mandate for constitutional and policy reform. However, the diversity of the coalition backing Sirisena and the sharing of power with newly appointed Prime Minister Ranil Wickremasinghe augur a period of volatility. Impacts If Tamil parties emerge as 'kingmakers' in April, governance of war-torn Northern and Western provinces is likely to be overhauled. Delhi, Washington and Brussels will welcome the political transition. Long-term growth prospects will turn on the precise rebalancing of budgetary allocations.

Libyan dialogue will turn on municipalities' influence

2015 ◽  
Keyword(s):  
Content Type ◽  
Turn On

Headline LIBYA: Dialogue will turn on municipalities' influence

Lesotho coalition hopes will turn on deputy premier

2015 ◽  
Keyword(s):  
Content Type ◽  
Turn On

Headline LESOTHO: Coalition hopes will turn on deputy premier

U-turn on pact shows Philippine need for US support

2020 ◽  
Keyword(s):  
Content Type ◽  
Turn On

Headline PHILIPPINES/US: U-turn on pact shows Philippine need

Requirements of students for video-annotations in lecture recordings

2014 ◽  
Vol 11 (3) ◽  
pp. 223-234 ◽  
Author(s):  
Rüdiger Rolf ◽  
Hannah Reuter ◽  
Martin Abel ◽  
Kai-Christoph Hamborg
Keyword(s):  
Focus Groups ◽  
Open Source ◽  
Design Methodology ◽  
Requirements Analysis ◽  
Recording System ◽  
Color Coding ◽  
Content Type ◽  
Turn On ◽  
Lecture Recordings ◽  
Different Types

Purpose – Improving the use of annotations in lecture recordings. Design/methodology/approach – Requirements analysis with scenario based design (SBD) on focus groups. Findings – These seven points have been extracted from the feedback of the focus groups: (1) Control of the annotation feature (turn on/turn off). (2) An option to decide who is able to see their comments (groups, lecturer, friends). (3) An easy and paper-like experience in creating a comment. (4) An option to discuss comments. (5) An option to import already existing comments. (6) Color-coding of the different types of comments. (7) An option to print their annotations within the context of the recording. Research limitations/implications – The study was performed to improve the open-source lecture recording system Opencast Matterhorn. Originality/value – Annotations can help to enable the students that use lecture recordings to move from a passive watching to an active viewing and reflecting.

EU U-turn on AstraZeneca vaccines may be too late

2021 ◽  
Keyword(s):  
Content Type ◽  
Turn On

Headline EUROPE: U-turn on AstraZeneca vaccines may be too late

U-turn on farm laws should help Modi’s party

2021 ◽  
Keyword(s):  
Content Type ◽  
Turn On ◽  
On Farm

Headline INDIA: U-turn on farm laws should help Modi’s party

Thai stability to turn on junta's performance in 2016

2016 ◽  
Keyword(s):  
Human Rights ◽  
Political Stability ◽  
Economic Decline ◽  
Military Rule ◽  
Sharp Rise ◽  
Content Type ◽  
Turn On ◽  
National Human ◽  
Political Freedoms

Subject Domestic political outlook. Significance Two reports released at the start of 2016 chart growing military restrictions on political freedoms. The Thai Lawyers for Human Rights reported a sharp rise in the use of military courts to try civilians charged with political crimes, while the Thai Journalists Association documented several incidents of reporters and editors being detained without charge. Meanwhile, in December, the National Human Rights Commission reported a rise in human rights complaints since the 2014 coup. Impacts Infrastructure mega-projects will proceed, but rural economic decline is the greatest risk to political stability. Lack of consensus on a new constitution could create the conditions for extending military rule to 2018. Mishandling of Yingluck's trial could reunite the PTP and its red-shirt base.

Sign in / Sign up

Export Citation Format

Share Document