The frequency and timing shifts associated with dispersion-managed solitons in a wavelength-division multiplexed system are computed by the numerically efficient Poisson sum technique. Analytical formulas are attainable by use of this approach with a Gaussian approximation for the soliton. The results are favorably compared with known results for the frequency shift. The method also applies to quasi-linear return-to-zero transmission formats.
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http://dx.doi.org/10.1364/ol.27.000318 | DOI Listing |
Eur J Neurosci
January 2025
European Brain Council, Brussels, Belgium.
Good brain health plays a significant role in an individual's well-being and profoundly impacts the collective economy and society. Brain development does not stop at birth, and some aspects continue throughout childhood and adolescence, allowing the full development of cognitive functions. Different determinants related to physical health, healthy environments, safety and security, life-long learning and social connection as well as access to quality services influence the way our brains develop, adapt and respond to stress and adversity.
View Article and Find Full Text PDFBackground: The field of formal nursing ethics is not new, with literature primarily from North America, dating back to the 1880s. The establishment of the international journal in 1994 served to stimulate, curate and disseminate research and scholarship in this evolving field. Three decades on, it is timely to review progress and to make recommendations for the future focus of the field.
View Article and Find Full Text PDFHandb Clin Neurol
January 2025
Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA, United States. Electronic address:
The nonimage-forming effects of light are pivotal in regulating cognitive functions, including alertness, sustained attention, and higher-order cognitive processes. These cognitive domains are deeply influenced by the sleep-wake cycle, which are governed by two key processes: the homeostatic process, which builds sleep pressure during wakefulness, and the circadian process, which aligns with environmental light cues to regulate wakefulness and sleep. When these processes fall out of sync-a condition known as circadian misalignment-alertness, sustained attention, and cognitive performance can suffer significantly.
View Article and Find Full Text PDFPharmacoecon Open
January 2025
Department of Health Policy and Medical Technology Research Group, LSE Health, London School of Economics and Political Science, London, UK.
Disparities in access to oncology medicines in European Union (EU) member states can impact patient outcomes profoundly, with availability and timely access varying significantly across and within member states. This paper discusses the intersection of the new European Health Technology Assessment Regulation (HTAR), the provisions of the proposed pharmaceutical legislation and their potential impacts on access to oncology medicines across EU member states. The HTAR, seeking to standardise the clinical evaluation of new medicines, has the potential to streamline the evaluation process but also risks oversimplifying diverse national healthcare needs.
View Article and Find Full Text PDFPolymers (Basel)
January 2025
State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China.
The Bohai oilfield is characterized by severe heterogeneity and high average permeability, leading to a low water flooding recovery efficiency. Polymer flooding only works for a certain heterogeneous reservoir. Therefore, supplementary technologies for further enlarging the swept volume are still necessary.
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