New technologies for time transfer with picoseconds precision and accuracy

2012 ◽  
Author(s):  
Ivan Prochazka ◽  
Josef Blazej ◽  
Jan Kodet
Keyword(s):  
New Technologies ◽  
Time Transfer ◽  
Precision And Accuracy

Two way time transfer with picoseconds precision and accuracy

2012 ◽  
Author(s):  
Jan Kodet ◽  
Ivan Prochazka ◽  
Josef Blazej ◽  
Petr Panek ◽  
Ulrich Schreiber ◽  
...  
Keyword(s):  
Time Transfer ◽  
Precision And Accuracy

Automation Improvements in Batch Cutting Process: The Last Profit Center for Pipelines

2008 ◽  
Author(s):  
Timothy R. Harbert
Keyword(s):  
New Technologies ◽  
Cutting Process ◽  
Government Agencies ◽  
Product Cost ◽  
Power Cost ◽  
Profit Center ◽  
Primary Driver ◽  
Precision And Accuracy ◽  
Low Sulfur ◽  
And Control

Two major developments have recently emerged driving pipeline companies to re-evaluate transmix and regrade generation within their systems, along with the process which is the primary driver of transmix production — batch cutting. Dramatic increases in product cost and the advent of ultra low sulfur (ULS) regulation and ULS products have brought renewed focus on transmix generation and control. Given that pipeline tariffs are generally controlled by government agencies, and power cost can only marginally be controlled, transmix/regrade reduction and the corresponding savings is probably the last great revenue generator for pipelines and shippers. Batch cutting techniques and technology have remained largely unchanged for several decades. However, new technologies and greater automation have created renewed opportunities to significantly reduce transmix/regrade on a system-wide basis. Analysis has shown that projects related to transmix reduction are highly profitable and improve the overall precision and accuracy of batch cutting. This paper reviews the sources of variability in the manual batch cut process and how this variability can be eliminated through automation and new technologies.

New technologies for laser time transfer and their possible application in the Galileo programme

2010 ◽  
Author(s):  
Ivan Prochazka ◽  
Josef Blazej ◽  
Jan Kodet ◽  
Ulrich Schreiber ◽  
Wolfgang Schafer ◽  
...  
Keyword(s):  
New Technologies ◽  
Time Transfer

Precision and accuracy of GPS time transfer

1993 ◽  
Vol 42 (2) ◽  
pp. 474-479 ◽  
Author(s):  
W. Lewandowski ◽  
G. Petit ◽  
C. Thomas
Keyword(s):  
Time Transfer ◽  
Precision And Accuracy

Principles of Low-Vacuum SEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1304-1305
Author(s):  
Klaus-Ruediger Peters
Keyword(s):  
New Technologies ◽  
High Vacuum ◽  
Optical Microscope ◽  
Specimen Surface ◽  
Electrical Field ◽  
Gaseous Environment ◽  
New Information ◽  
Gas Molecules ◽  
New Interactions ◽  
Gas Pressures

Only recently it became possible to expand scanning electron microscopy to low vacuum and atmospheric pressure through the introduction of several new technologies. In principle, only the specimen is provided with a controlled gaseous environment while the optical microscope column is kept at high vacuum. In the specimen chamber, the gas can generate new interactions with i) the probe electrons, ii) the specimen surface, and iii) the specimen-specific signal electrons. The results of these interactions yield new information about specimen surfaces not accessible to conventional high vacuum SEM. Several microscope types are available differing from each other by the maximum available gas pressure and the types of signals which can be used for investigation of specimen properties.Electrical non-conductors can be easily imaged despite charge accumulations at and beneath their surface. At high gas pressures between 10-2 and 2 torr, gas molecules are ionized in the electrical field between the specimen surface and the surrounding microscope parts through signal electrons and, to a certain extent, probe electrons. The gas provides a stable ion flux for a surface charge equalization if sufficient gas ions are provided.

Structural dynamics of P-type ATPase ion pumps

2019 ◽  
Vol 47 (5) ◽  
pp. 1247-1257 ◽  
Author(s):  
Mateusz Dyla ◽  
Sara Basse Hansen ◽  
Poul Nissen ◽  
Magnus Kjaergaard
Keyword(s):  
Structural Dynamics ◽  
Single Molecule ◽  
New Technologies ◽  
Atp Hydrolysis ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Time Resolved ◽  
Dynamics Simulations ◽  
Types Of Information ◽  
P Type

Abstract P-type ATPases transport ions across biological membranes against concentration gradients and are essential for all cells. They use the energy from ATP hydrolysis to propel large intramolecular movements, which drive vectorial transport of ions. Tight coordination of the motions of the pump is required to couple the two spatially distant processes of ion binding and ATP hydrolysis. Here, we review our current understanding of the structural dynamics of P-type ATPases, focusing primarily on Ca2+ pumps. We integrate different types of information that report on structural dynamics, primarily time-resolved fluorescence experiments including single-molecule Förster resonance energy transfer and molecular dynamics simulations, and interpret them in the framework provided by the numerous crystal structures of sarco/endoplasmic reticulum Ca2+-ATPase. We discuss the challenges in characterizing the dynamics of membrane pumps, and the likely impact of new technologies on the field.

Meiotic CENP-C is a shepherd: bridging the space between the centromere and the kinetochore in time and space

2020 ◽  
Vol 64 (2) ◽  
pp. 251-261
Author(s):  
Jessica E. Fellmeth ◽  
Kim S. McKim
Keyword(s):  
Chromosome Segregation ◽  
New Technologies ◽  
Early Prophase ◽  
Unique Role ◽  
Kinetochore Assembly ◽  
M Phase ◽  
In Vivo Analysis ◽  
Meiosis I

Abstract While many of the proteins involved in the mitotic centromere and kinetochore are conserved in meiosis, they often gain a novel function due to the unique needs of homolog segregation during meiosis I (MI). CENP-C is a critical component of the centromere for kinetochore assembly in mitosis. Recent work, however, has highlighted the unique features of meiotic CENP-C. Centromere establishment and stability require CENP-C loading at the centromere for CENP-A function. Pre-meiotic loading of proteins necessary for homolog recombination as well as cohesion also rely on CENP-C, as do the main scaffolding components of the kinetochore. Much of this work relies on new technologies that enable in vivo analysis of meiosis like never before. Here, we strive to highlight the unique role of this highly conserved centromere protein that loads on to centromeres prior to M-phase onset, but continues to perform critical functions through chromosome segregation. CENP-C is not merely a structural link between the centromere and the kinetochore, but also a functional one joining the processes of early prophase homolog synapsis to late metaphase kinetochore assembly and signaling.

Sign in / Sign up

Export Citation Format

Share Document