Composite estimator based on the recursive ratio for an arbitrary rotation scheme

2018 ◽  
Vol 25 (4) ◽  
pp. 227-247
Author(s):  
Barbara Kowalczyk ◽  
Dorota Juszczak
Keyword(s):  
Rotation Scheme ◽  
Composite Estimator

scholarly journals A Low-Cost MEMS Missile-Borne Compound Rotation Modulation Scheme

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4910
Author(s):  
Xiaoqiao Yuan ◽  
Jie Li ◽  
Xi Zhang ◽  
Kaiqiang Feng ◽  
Xiaokai Wei ◽  
...  
Keyword(s):  
Rotation Axis ◽  
Low Cost ◽  
Roll Angle ◽  
Modulation Scheme ◽  
Navigation Systems ◽  
Rotation Scheme ◽  
Compound Rotation ◽  
Error Accumulation ◽  
Axis Rotation ◽  
Single Axis Rotation

Rotation modulation (RM) has been widely used in navigation systems to significantly improve the navigation accuracy of inertial navigation systems (INSs). However, the traditional single-axis rotation modulation cannot achieve the modulation of all the constant errors in the three directions; thus, it is not suitable for application in highly dynamic environments due to requirements for high precision in missiles. Aiming at the problems of error accumulation and divergence in the direction of rotation axis existing in the traditional single-axis rotation modulation, a novel rotation scheme is proposed. Firstly, the error propagation principle of the new rotation modulation scheme is analyzed. Secondly, the condition of realizing the error modulation with constant error is discussed. Finally, the original rotation modulation navigation algorithm is optimized for the new rotation modulation scheme. The experiment and simulation results show that the new rotation scheme can effectively modulate the error divergence of roll angle and improve the accuracy of roll angle by two orders of magnitude.

The rotation scheme of quantum states based on EPR pairs

2022 ◽  
Author(s):  
Si-Yu Xiong ◽  
Liang Tang ◽  
Qun Zhang ◽  
Dan Xue ◽  
Ming-Qiang Bai ◽  
...  
Keyword(s):  
Ground State ◽  
Short Distance ◽  
Small Range ◽  
Transmission Scheme ◽  
Single Qubit ◽  
Unknown State ◽  
Rotation Scheme ◽  
Complete State ◽  
State Formula ◽  
Bidirectional Transmission

In this paper, we give a further discussion of short-distance teleportation. We propose bidirectional, rotation and cyclic rotation teleportation schemes for short-distance participants, respectively. In our bidirectional transmission scheme, the quantum channel is still an EPR pair and an auxiliary qubit in the ground state [Formula: see text], and two participants can transmit an unknown single-qubit state to each other. In the rotation and cyclic rotation schemes, bidirectional transmission is performed between two adjacent participants in turn. The unknown state qubits of the participants collapse into the ground state after one bidirectional transmission, and can be used as auxiliary qubits in subsequent bidirectional transmission. After a complete state rotation, each participant has held the unknown state of the other participants, and the last one owned by the participant is still the original unknown state. Although the schemes we proposed are applicable to a small range of transmission, they have certain advantages in saving quantum resources.

scholarly journals Laterality in artistic gymnastics

2016 ◽  
Vol 30 (1) ◽  
pp. 19-27
Author(s):  
Flavio BESSI
Keyword(s):  
Years Of Experience ◽  
Upright Stance ◽  
Rotation Scheme ◽  
The Relationship ◽  
Different Levels

Abstract Worldwide trainers ask if there is a rotation scheme, which facilitate the learning of the elements with longitudinal rotations. Although there are some research on it, they did not attempt to verify a total scheme, but merely to see the relationship between two elements or four elements. In this study we analyse the appreciation of experts N = 161 coaches (age: 34.9 ± 10.9) from different levels of expertise and from different countries (ARG, BOL, BRA, CHI, ECU, ELS, GER, GUA, HON, MEX, PAN, PER, URU, VEN) with 12 ± 8.8 years of experience regardinghow gymnasts should execute 27 different elements in 5 male apparatus. We chose these elements, because we wanted to have movements with rotation in upright stance, upside down and in combination with transversal rotation. Through a questionnaire for coaches, we tried to verify if there are differences, coincidences or even immovable rules in the rotation scheme that gymnasts use (or should use). The answers were typologized with three categories of rotational preference: unilateral consistent twister, bilateral consistent twister and inconsistent twister. The study aimed to answer several questions: Do coaches agree on how the rotation scheme should be in gymnastics? How do coaches (former gymnasts) determined which way to turn? Do the handedness or the footedness influence on the direction of rotation? Does the personal rotation scheme influence on the concept of appropriate rotation scheme? Do the national practices influence the rotation scheme? Are there differences in appreciation between coaches at different levels? Are unambiguous rules among the elements?

scholarly journals When mountains weep: psychological care for those affected by the earthquake in northern Pakistan

2006 ◽  
Vol 30 (12) ◽  
pp. 454-456 ◽  
Author(s):  
Murad M. Khan
Keyword(s):  
Group Dynamics ◽  
Substance Misuse ◽  
Interpersonal Relationship ◽  
Day Hospital ◽  
Northern Pakistan ◽  
Psychological Care ◽  
Reality Testing ◽  
Rotation Scheme ◽  
To Come ◽  
The Uk

Fate, it seems, conjures up all sorts of ways for us to be in a certain place at a certain time. In 1982 as a trainee psychiatrist in the UK, I found myself co-facilitating a group at the Castlewood Day Hospital, then part of the Bexley psychiatric rotation scheme, in the south-east of London. Group psychotherapy was part of our training. Held thrice a week the groups were open-ended and patients ranged from those with interpersonal relationship and personality problems to those with anxiety and substance misuse problems. At the time the experience was somewhat baffling. Not only was I from a different country and culture, my exposure to psychiatry was limited to about 12 months. More often than not I felt lost as I tried to come to terms with ‘group dynamics', ‘reality testing’, ‘transference’, ‘multiple transference’, ‘group cohesion’, ‘group pressure’, etc.

Unconstrained global simulations of ocean tides up to degree 3 for satellite gravimetry

2021 ◽  
Author(s):  
Roman Sulzbach ◽  
Henryk Dobslaw ◽  
Maik Thomas
Keyword(s):  
Signal To Noise Ratio ◽  
Relative Accuracy ◽  
Ocean Tide ◽  
Groundwater Depletion ◽  
Altimetry Data ◽  
Satellite Gravity ◽  
Tidal Model ◽  
Rotation Scheme ◽  
Gravimetric Data ◽  
High Level

<p>Tidal de-aliasing of satellite gravimetric data is a critical task in order to correctly extract gravimetric signatures of climate signals like glacier melting or groundwater depletion and poses a high demand on the accuracy of the employed tidal solutions (Flechtner et al., 2016). Modern tidal atlases that are constrained by altimetry data possess a high level of accuracy, especially for partial tides exhibiting large open ocean signals (e.g. M2, K1). Since the achievable precision directly depends on the available density and quality of altimetry data, the accuracy relative to the tidal amplitude drops for minor tidal excitations (worse signal-to-noise ratio) as well as in polar latitudes (sparse satellite-data). In contrast, this drop in relative accuracy can be reduced by employing an unconstrained tidal model acting independently of altimetric data.<br>We will present recent results from the purely-hydrodynamic, barotropic tidal model TiME (Weis et al., 2008) that benefit from a set of recently implemented upgrades. Among others, these include a revised scheme for dynamic feedbacks of self-attraction and loading; energy-dissipation by parametrized internal wavedrag; partial tide excitations by the tide-generating potential up to degree 3; and a pole-rotation scheme allowing for simulations dedicated to polar areas. Benefiting from the recent updates, the obtained solutions for major tides are on the same level of accuracy as comparable modern unconstrained tidal models. Furthermore, we show that the relative accuracy level only drops moderately for tidal excitations with small excitation strength (e.g. for minor tides), thus narrowing down the accuracy gap to data-constrained tidal atlases. Exemplarily for this, we introduce solutions for minor tidal excitations of degrees 2 and 3 that represent valuable constraints for the expected ocean tide dynamics. While they are currently not considered for GRACE-FO de-aliasing we demonstrate that third-degree tides can lead to relevant aliasing of satellite gravity fields and correspond closely to recently published empirical solutions (Ray, 2020).</p>

Lobbying cycles in Brussels: Evidence from the rotating presidency of the Council of the European Union

2018 ◽  
Vol 19 (4) ◽  
pp. 597-616 ◽  
Author(s):  
Michelle Hollman ◽  
Zuzana Murdoch
Keyword(s):  
European Union ◽  
Member State ◽  
Interest Groups ◽  
National Interest ◽  
The European Union ◽  
European Level ◽  
Eu Member States ◽  
Rotation Scheme ◽  
Council Presidency ◽  
Unique Dataset

The Council presidency holds direct responsibility for the Council’s functioning and moves between EU member states via a six-month rotation scheme. We argue that this rotating Council presidency causes a lobbying cycle among interest groups at the European level, whereby national interest groups from the country holding the presidency temporarily become active at the European level. Using a unique dataset including almost 16,500 registrations of interest groups in the European Transparency Register over the 2008–2017 period, we confirm that holding the Council presidency increases the number of interest groups from that member state in the Transparency Register. We also find that national interest groups generally have a higher likelihood to exit the register following the end of their country’s presidency.

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