Dispersion-Assisted Tunable Fluorescence from Carbon Dots

In this study, carbon dots (CDs) synthesized by hydrothermal method with amino-rich surface exhibit tunable fluorescence across entire visible range by simply controlling the concentration. A comprehensive comparison has been performed for the first time between concentration-induced aggregation of the single-type CDs and electrostatic-induced agglomeration of opposite-charged CDs in terms of their fluorescence properties. Experimental results show that both the aggregation of CDs and internal absorption filtration are possible causes of the concentration-dependent fluorescence emission. Subsequently, the inter distance of adjacent CDs in their aggregates was enlarged by forming rigid double-stranded DNA (dsDNA) between adjacent CDs through base pairing. It is clear that the contact of CDs induces the changes of fluorescence emission and light absorption. Through a better understanding of the mechanisms behind concentration-induced multicolor emission, this work can provide a novel strategy to develop the advanced applications of CDs.

GaN-Based Bipolar Cascade Lasers with 25nm Wide Quantum Wells

Utilizing self-consistent numerical simulation in good agreement with measurements, we analyze internal device physics, performance limitations, and optimization options for a unique laser design with multiple active regions separated by tunnel junctions, featuring surprisingly wide InGaN quantum wells. Contrary to common assumptions, these quantum wells are revealed to allow for perfect screening of the strong built-in polarization field, while optical gain is provided by higher quantum levels. However, internal absorption, low p-cladding conductivity, and self-heating are shown to strongly limit the laser performance.

Effect of high bandgap AlAs quantum barrier on electronic and optical properties of In0.70Ga0.03As/Al0.60In0.40As superlattice under applied electric field for laser and detector applications

Effect of high bandgap [Formula: see text] nm AlAs on the electronic and optical properties of the In[Formula: see text]Ga[Formula: see text]As/Al[Formula: see text]In[Formula: see text]As superlattice is investigated by using effective mass approximation under the electric field. Electronic transitions are obtained as [Formula: see text] and [Formula: see text] eV for [Formula: see text] and [Formula: see text] in the gain region. Thin AlAs increases electron confinement in the superlattice and prevents electron leakage in the gain region which mostly results in higher absorption/emission in the superlattice. AlAs has no major effects on transitions energies in the gain region but it is effectively decreasing the total absorption in the injector region and preventing the internal absorption. AlAs also makes the superlattice optically more stable by decreasing the high refractive index change in the injector region by factor 5.

The Determinants of Global Competitiveness of Economy: A Dynamic Panel Approach Applied to the WAEMU Countries

This paper examines the determinants of the global competitiveness of the WAEMU economy applying a dynamic panel approach from 2011 to 2017. After providing a synthesis of the both theoretical and empirical debates on the subject, we derived a dynamic panel model which estimation was reached using the system generalized method of moments (GMM). The result of the estimation shows that competitiveness lagged by one period, financial development, GDP per capita, internal absorption and foreign trade taxes positively and significantly affect the global competitiveness of WAEMU countries, while economic openness, the inflation rate and the quality of institutions have a negative and significant contribution.

The determinants of the global competitiveness of the economy: a dynamic panel approach applied to the WAEMU country

This article examines the determinants of the overall competitiveness of the WAEMU economy from a dynamic panel approach over the period 2011–2017. The estimate by the method of generalized moments in system (GMM) Reveled that the delayed competitiveness of a period financial development, GDP per head, internal absorption and taxes on foreign trade affects positively and significantly the overall competitiveness of the WAEMU countries while economic openness, the rate of inflation and the quality of institutions have contributed negative and significant. It emerges from this work that an improvement in the overall competitiveness of the Union's economy imperatively requires accelerating the process of development of quality, the financial system as well as protecting local industries from external pressure to through a more adequate commercial policy taking into account the constraints linked to commercial agreements.

Synthesis and Biological Activity of Triclopyr Derivatives Containing the Pyridine Group

Background: Triclopyr(Dow-503), whose commercial name was green grass, was an internal absorption and selective novel herbicide, developed by Dow agricultural sciences using the basic structure of 2,4-D. Triclopyr was suitable for preventing broadleaf weeds for removing shrubs, maintaining fireproof lines, raising pine trees and forest areas. Moreover, it could be used in paddy fields to prevent some broad-leaved weeds at the dose of 150-500g/hm. Methods: Two novel Triclopyr derivatives were synthesized based on the structure of commerical herbicide Triclopyr. Their structures were confirmed by 1H NMR melting point and elemental analysis. The preliminary bioassay were also evaluated. Results: The preliminary bioassay results showed that the title compounds had some herbicidal activities at the dosage of 150 g/hm2.The compound 1 and 2 show the 100% inhibition against three kinds of test weeds. Further test revealed that compound 2 showed the 100% inhibition against the Amaranthus. The safety test for crop revealed that the compound 2 was safe for paddy at the dosage of 150 g/hm2. Conclusion: The two compounds can be used as the leading compounds with certain optimized value.

Chromogenic agents built around a multifunctional double-triazine framework for enzymatically triggered cross-linking under physiological conditions

A molecular architecture designed for bioconjugation and internal absorption ratiometry undergoes enzymatically triggered cleavage of glucosyl groups and subsequent oxidative dimerization in aqueous solution to yield indigoid-containing scaffolds.

Influence of hole transport layers on internal absorption, charge recombination and collection in HC(NH2)2PbI3 perovskite solar cells

The internal absorption, charge recombination and collection in HC(NH2)2PbI3 (FAPbI3) perovskite solar cells with P3HT and spiro-OMeTAD as the HTL are investigated. The results show that the HTL can affect the internal absorption spectra of the perovskite layers, and spiro-OMeTAD HTL is beneficial for reducing the recombination and enhancing the charge collection in PeSCs.

Paradox: The Maple Leaf Way Up in Ambient Space

This chapter re-examines some of the phenomena that occurred during an experience of internal absorption. Chapters 5, 6, and 15 have indicated that if the functions of neurons in the parahippocampus and inferior temporal cortex were enhanced, the result could blend these focal and global functions so as to enable an item in the far periphery to be “seen,” in clear focus, in a paradoxical manner.