Comparison of the dielectric properties of Ecoflex® with L,D-poly(lactic acid) or polycaprolactone in the presence of SWCN or 5CB

The main goal of this paper was to study the dielectric properties of hybrid binary and ternary composites based on biodegradable polymer Ecoflex®, single walled carbon nanotubes (SWCN), and liquid crystalline 4′-pentyl-4-biphenylcarbonitrile (5CB) compound. The obtained results were compared with other created analogically to Ecoflex®, hybrid layers based on biodegradable polymers such as L,D-polylactide (L,D-PLA) and polycaprolactone (PCL). Frequency domain dielectric spectroscopy (FDDS) results were analyzed taking into consideration the amount of SWCN, frequency, and temperature. For pure Ecoflex®, two relaxation processes (α and β) were identified. It was shown that the SWCN admixture (in the weight ratio 10:0.01) did not change the properties of the Ecoflex® layer, while in the case of PCL and L,D-PLA, the layers became conductive. The dielectric constant increased with an increase in the content of SWCN in the Ecoflex® matrix and the conductive behavior was not visible, even for the greatest concentration (10:0.06 weight ratio). In the case of the Ecoflex® polymer matrix, the conduction relaxation process at a frequency ca. several kilohertz appeared and became stronger with an increase in the SWCN admixture in the matrix. Addition of oleic acid to the polymer matrix had a smaller effect on the increase in the dielectric response than the addition of liquid crystal 5CB. Fourier transform infrared (FTIR) results revealed that the molecular structure and chemical character of the Ecoflex® and PCL matrixes remained unchanged upon the addition of SWCN or 5CB in a weight ratio of 10:0.01 and 10:1, respectively, while molecular interactions appeared between L,D-PLA and 5CB. Moreover, adding oleic acid to pure Ecoflex® as well as the binary and ternary hybrid layers with SWCN and/or 5CB in a weight ratio of Ecoflex®:oleic acid equal to 10:0.3 did not have an influence on the chemical bonding of these materials

Konflik Muslim Rohingya dalam Bingkai Tiga Media Islam di Indonesia

Rohingya Case in Myanmar attracted the attention for a number of Islamic media in Indonesia, including eramuslim.com site, Republika daily and Sabili magazine. Although all three of Islamic media covering the same case, and even with the same sources, but there are striking differences between all of them. eramuslim.com framing the case as a case of violence involving name of religion. Republika daily saw this case as a organized violation of the law until to be a problem that also resolved by the Non-Aligned Movement. While the Sabili magazine saw as injustice in making policies by Myanmar government that make an oppressed Rohingya by various sides

p-State Luminescence in CdSe Nanoplatelets: The Role of Lateral Confinement and an LO Phonon Bottleneck

We report excited state emission from p-states at excitation fluences well below ground state saturation in CdSe nanoplatelets. Size dependent exciton ground state-excited state energies and dynamics are determined by three independent methods, time-resolved photoluminescence (PL), time-integrated PL and Hartree renormalized k$\cdot$p calculations -- all in very good agreement. The ground state-excited state energy spacing strongly increases with the lateral platelet quantization. Our results suggest that the PL decay of CdSe platelets is governed by an LO-phonon bottleneck, related to the reported low exciton phonon coupling in CdSe platelets and only observable due to the very large oscillator strength and energy spacing of both states

Prozess- und Struktursimulation von endlosfaserverstärkten thermoplastischen Karosseriebauteilen

Experimentelle Ermittlung von Kennwerten für die Simulation des Thermoformenprozesses. Umformsimulation von Karosseriebauteilen (bspw. Dachspriegel BMW 7er oder Batterieträger R8 e-tron) aus endlosfaserverstärkten Thermoplasten. Übertragung der Faserorientierung aus der Umformsimulation in die Struktursimulation zur Bauteildimensionierung sowie Vergleich zu experimentellen Untersuchungen an einem ausgewählten Strukturbauteil

Biodegradable, conductive and flexible substrates for opto-electronic devices

Dokonano analizy porównawczej wpływu zawartości poszczególnych składników na wybrane właściwości warstw hybrydowych dwu- i trójskładnikowych na bazie trzech polimerów biodegradowalnych z domieszką jednościennych nanorurek węglowych (SWCN) i ciekłego kryształu 5CB. Pokazano, że najlepsze właściwości dla zastosowań w opto-elektronice jako biodegradowalna elektroda wykazuje kompozyt L,DPLA:5CB:SWCN (10:1:0,5) o dużej elastyczności oraz dobrej stabilności termicznej.A comparative analysis of the impact of the content of individual components on selected properties of two- and three-component hybrid layers based on three biodegradable polymers with an admixture of single-walled carbon nanotubes (SWCN) and 5CB liquid crystal was carried out. The best one for applications in opto-electronics as a biodegradable electrode turned out to be the L,D-PLA:5CB:SWCN (10:1:0,5) composite with high flexibility and good thermal stability. (Biodegradable, conductive and flexible substrates for opto-electronic devices)

Modulators of CXCR4 and CXCR7/ACKR3 Function

Copyright © 2019 by The Author(s). The two G protein-coupled receptors (GPCRs) C-X-C chemokine receptor type 4 (CXCR4) and atypical chemokine receptor 3 (ACKR3) are part of the class A chemokine GPCR family and represent important drug targets for human immunodeficiency virus (HIV) infection, cancer, and inflammation diseases. CXCR4 is one of only three chemokine receptors with a US Food and Drug Administration approved therapeutic agent, the small-molecule modulator AMD3100. In this review, known modulators of the two receptors are discussed in detail. Initially, the structural relationship between receptors and ligands is reviewed on the basis of common structural motifs and available crystal structures. To date, no atypical chemokine receptor has been crystallized, which makes ligand design and predictions for these receptors more difficult. Next, the selectivity, receptor activation, and the resulting ligand-induced signaling output of chemokines and other peptide ligands are reviewed. Binding of pepducins, a class of lipid-peptides whose basis is the internal loop of a GPCR, to CXCR4 is also discussed. Finally, small-molecule modulators of CXCR4 and ACKR3 are reviewed. These modulators have led to the development of radio- and fluorescently labeled tool compounds, enabling the visualization of ligand binding and receptor characterization both in vitro and in vivo. SIGNIFICANCE STATEMENT: To investigate the pharmacological modulation of CXCR4 and ACKR3, significant effort has been focused on the discovery and development of a range of ligands, including small-molecule modulators, pepducins, and synthetic peptides. Imaging tools, such as fluorescent probes, also play a pivotal role in the field of drug discovery. This review aims to provide an overview of the aforementioned modulators that facilitate the study of CXCR4 and ACKR3 receptors

Evidence for increasing global wheat yield potential

Wheat is the most widely grown food crop, with 761 Mt produced globally in 2020. To meet the expected grain demand by mid-century, wheat breeding strategies must continue to improve upon yield-advancing physiological traits, regardless of climate change impacts. Here, the best performing doubled haploid (DH) crosses with an increased canopy photosynthesis from wheat field experiments in the literature were extrapolated to the global scale with a multi-model ensemble of process-based wheat crop models to estimate global wheat production. The DH field experiments were also used to determine a quantitative relationship between wheat production and solar radiation to estimate genetic yield potential. The multi-model ensemble projected a global annual wheat production of 1050 +/- 145 Mt due to the improved canopy photosynthesis, a 37% increase, without expanding cropping area. Achieving this genetic yield potential would meet the lower estimate of the projected grain demand in 2050, albeit with considerable challenges