390,820 research outputs found
Homodyne coherent detection of ASK and PSK signals performed by a subcarrier optical phase-locked loop
No full textOptical transmission systems based on homodyne coherent detection of 2-ASK and pilot carrier 2-PSK signals have been implemented. ASK data has been transmitted at 2.5 Gbps, while 2.5 Gbps and 10 Gbps PSK systems have been tested. The proposed architecture is based on a new optical phase locked loop founded on sub-carrier modulation and leads to new compact integrated receivers and new transmission formats, thus opening new opportunities for future optical systems
Loop detection of mobile robots using interval analysis
No full textThis paper proposes an original set-membership approach for loop detection of mobile robots in the situation where proprioceptive sensors only are available. To detect loops, the new concepts of the t-plane (which is a two dimensional space with time coordinates) are introduced. Intervals of functions (or tubes) are then used to represent uncertain trajectories and tests are provided in order to eliminate parts of the t-plane that do not correspond to any loop. An experiment with an actual underwater robot is proposed in order to illustrate the principle and the efficiency of the approach
oocytes and HeLa cells requires complex formation with mPER1
No full textSeveral transcription factors with the function of setting the biological clock in vertebrates have been described. A detailed understanding of their nucleocytolasmic transport properties may uncover novel aspects of the regulation of the circadian rhythm. This assumption led us to perform a systematic analysis of the nuclear import characteristics of the different murine PER and CRY proteins, using Xenopus oocytes and HeLa cells as experimental systems. Our major finding is that nuclear import of mPER3 requires complex formation with mPER1. We further show that the nuclear localization signal (NLS) function of mPER1 and not activation of a masked NLS in mPER3 is critical for the import of the mPER1-mPER3 complex. Finally, and as previously described in other cell systems, nuclear import of mPER proteins in Xenopus oocytes correlates positively with their phosphorylation
2.5-Gb/s BPSK Ultradense WDM Homodyne Coherent Detection Using a Subcarrier-Based Optical Phase-Locked Loop
No full textModification of Loop 1 Affects the Nucleotide Binding Properties of Myo1c, the Adaptation Motor in the Inner Ear
No full textMyo1c is one of eight members of the mammalian myosin I family of actin-associated molecular motors. In stereocilia of the hair cells in the inner ear, Myo1c presumably serves as the adaptation motor, which regulates the opening and closing of transduction channels. Although there is conservation of sequence and structure among all myosins in the N-terminal motor domain, which contains the nucleotide- and actin-binding sites, some differences include the length and composition of surface loops, including loop 1, which lies near the nucleotide-binding domain. To investigate the role of loop 1, we expressed in insect cells mutants of a truncated form of Myo1c, Myo1c1IQ, as well as chimeras of Myo1c1IQ with the analogous loop from other myosins. We found that replacement of the charged residues in loop 1 with alanines or the whole loop with a series of alanines did not alter the ATPase activity, transient kinetics properties, or Ca2+ sensitivity of Myo1c1IQ. Substitution of loop 1 with that of the corresponding region from tonic smooth muscle myosin II (Myo1c1IQ-tonic) or replacement with a single glycine (Myo1c1IQ-G) accelerated the release of ADP from A.M 2?3-fold in Ca2+, whereas substitution with loop 1 from phasic muscle myosin II (Myo1c1IQ-phasic) accelerated the release of ADP 35-fold. Motility assays with chimeras containing a single ?-helix, or SAH, domain showed that Myo1cSAH-tonic translocated actin in vitro twice as fast as Myo1cSAH-WT and 3-fold faster than Myo1cSAH-G. The studies show that changes induced in Myo1c via modification of loop 1 showed no resemblance to the behavior of the loop donor myosins or to the changes previously observed with similar Myo1b chimeras
Loop Leaping with Closures
No full textLoop leaping is the colloquial name given to a form of program analysis in which summaries are derived for nested loops starting from the innermost loop and proceeding in a bottom-up fashion considering one more loop at a time. Loop leaping contrasts with classical approaches to finding loop invariants that are iterative; loop leaping is compositional requiring each stratum in the nest of loops to be considered exactly once. The approach is attractive in predicate abstraction where disjunctive domains are increasingly used that present long ascending chains. This paper proposes a simple and an efficient approach for loop leaping for these domains based on viewing loops as closure operators
Smarandache Idempotents in Loop Rings
No full textIn this paper we establish the existence of S-idempotents in case of loop rings
Two-loop Sudakov form factor in ABJM
No full textThis article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited
Closed loop supply chain for end of life textiles
No full textPurpose: This paper aims to summarise current closed loop supply chain systems available in the literature and identify key characteristics for efficient closed loop supply chains with specific reference to the textile industry. With the aim to reduce the environmental impact of waste textile, this work is looking to identify if this can be achieved by incorporating closed loop elements within the design of a textile supply chain system. This paper also examines supply chain networks and designs required within the context of end of life (Eol) management of textiles.
Research Approach: The initial approach considered here is based on a detailed investigation of current literature from logistics, textile and system engineering journals which tackle the issue of closed loop supply chain systems. Concepts such as Extended Producer Responsibility, Industrial Ecology and Zero Waste will be detailed within this evaluation. The objective here is to understand how issues identified in the literature relate to a specific automotive interiors textile company. Therefore the following step in our approach is to consider a specific case study using Sage Automotive Interiors.
Findings and Originality: Closed loop supply chain analyses were carried out by many researchers to aid product development, logistics and supply chain management. Most studies have centred their attention on chemicals, pharmaceuticals or food industries where few have tackled the textiles industry specifically because of its complex supply chain design, logistics, raw materials definitions and fibre mix issues. This work will capture current and specific details from an end of life closed loop supply chain system.
Research Impact: This evaluation is looking to highlight potential sustainability issues from product, process and supply chain design and provide a research agenda in relation to these issues.
Practical Impact: Many companies see sustainability not only from the type of products they use within their process, but also from the operations, procedures, materials used and the recycle opportunities offered by their final product. All these can be captured within the analysis of a complex closed loop supply chain system. This investigation aims to highlight key problem areas in closed loop supply chain systems and provide an evaluation for the benefit of the textile industry
TDM-to-WDM conversion from 130 Gbit/s to 3 × 43 Gbit/s using XPM in a NOLM switch
No full textWe report the first demonstration of OTDM-to-WDM conversion from 130 Gbit/s simultaneously to 3 × 43 Gbit/s WDM channels in a nonlinear optical loop mirror (NOLM). The scheme is exploiting the ultra-fast Kerr based XPM in a NOLM and gives full flexibility for selecting the output WDM channel wavelengths. For the success of the experiment we rely crucially on a new specially designed highly nonlinear fiber (HNLF) exhibiting low dispersion and low dispersion slope such that low walk-off operation across the C-band is possible. Error free performance is achieved with penalties ranging from 0.5 dB to 3.5 dB for all three WDM channels.</p
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