In a generic synthesis approach, all three CsPbX
(X=Cl, Br and I) perovskite nanocrystals having near unity quantum yields is reported. This has been achieved by injecting the desired amount of ...preformed alkylammonium halide salts which acted as a dual source providing halide ions and the capping agent to an equimolar amount of non-halide Pb and Cs precursors in a reaction flask at an optimized reaction temperature. The composition sensitivity of Pb to Cs ratio, high temperature reaction, and injection of ammonium halide remained the key parameters for obtaining the high quantum yields. Details of the reaction process, use of different reagents and setting up the reaction parameters are reported.
Indonesia is facing various challenges because some people do not use religious and cultural values as a source of ethics in the nation and state. Socio-cultural conflicts have occurred due to ...ethnic, cultural, and religious pluralism that the government and society are not appropriately managed and fair. Based on that, Pancasila is needed by all generations of the nation. The type of research method used in this research is normative research, namely research on library materials which are primary data in science is classified as secondary data, which relies on data collection tools in the form of library studies or document studies. The research concludes that generations need Pancasila to unify the nation. Even though the Indonesian people are now united, it does not mean that Pancasila is no longer needed. Because what is called the Indonesian nation is what is currently there and what will exist in the future. As long as the regeneration process continues, we still need Pancasila as a unifying nation.
This article discusses standard Radial Basis Function (RBF) partition of unity method and an enhanced version known as the direct RBF partition of unity method. We introduce the framework of these ...methods for the effective and accurate numerical analysis of certain two-dimensional time-dependent Partial Differential Equations (PDEs). Additionally, we conduct a convergence analysis of these methods and establish error bounds for local approximations. These error bounds are determined based on conditions associated with the eigenvalues of the Laplacian operator matrices generated by the proposed methods. To validate the accuracy and reliability of these approaches, we provide several numerical examples. We assess the consistency between theoretical and numerical results. The localized techniques introduced in this research demonstrate a significant reduction in computational cost and algorithmic complexity, achieved through the direct local procedure. Despite this computational advantage, both versions of the RBF partition of unity method exhibit a similar level of accuracy. Finally, we conduct a comparative analysis between the RBF partition of unity local methods and the RBF-generated finite differences method, offering valuable insights into the strengths and limitations of each approach.
There has been longstanding interest from both experimental psychologists and cognitive neuroscientists in the potential modulatory role of various top-down factors on multisensory ...integration/perception in humans. One such top-down influence, often referred to in the literature as the 'unity assumption,' is thought to occur in those situations in which an observer considers that various of the unisensory stimuli that they have been presented with belong to one and the same object or event (Welch and Warren, 1980). Here, we review the possible factors that may lead to the emergence of the unity assumption. We then critically evaluate the evidence concerning the consequences of the unity assumption from studies of the spatial and temporal ventriloquism effects, from the McGurk effect, and from the Colavita visual dominance paradigm. The research that has been published to date using these tasks provides support for the claim that the unity assumption influences multisensory perception under at least a subset of experimental conditions. We then consider whether the notion has been superseded in recent years by the introduction of priors in Bayesian causal inference models of human multisensory perception. We suggest that the prior of common cause (that is, the prior concerning whether multisensory signals originate from the same source or not) offers the most useful way to quantify the unity assumption as a continuous cognitive variable.
Abstract
Given a topological group
X
with unity
e
. Suppose that
X
satisfies semilocally simply connected, locally path connected and connected condition. For every connected covering space (
X
˜
, ...q) of
X
, there is a binary operation such that
X
˜
becomes a topological group with unity
r
,
q
(
r
) =
e
and
q
becomes a group homomorphism. In this paper, we show that there is a unique binary operation on
X
˜
such that it is a topological group with unity
r
and
q
is a group homomorphism.
An optimal single-photon source should deterministically deliver one, and only one, photon at a time, with no trade-off between the source’s efficiency and the photon indistinguishability. However, ...all reported solid-state sources of indistinguishable single photons had to rely on polarization filtering, which reduced the efficiency by 50%, fundamentally limiting the scaling of photonic quantum technologies. Here, we overcome this long-standing challenge by coherently driving quantum dots deterministically coupled to polarization-selective Purcell microcavities. We present two examples: narrowband, elliptical micropillars and broadband, elliptical Bragg gratings. A polarization-orthogonal excitation–collection scheme is designed to minimize the polarization filtering loss under resonant excitation. We demonstrate a polarized single-photon efficiency of 0.60 ± 0.02 (0.56 ± 0.02), a single-photon purity of 0.975 ± 0.005 (0.991 ± 0.003) and an indistinguishability of 0.975 ± 0.006 (0.951 ± 0.005) for the micropillar (Bragg grating) device. Our work provides promising solutions for truly optimal single-photon sources combining near-unity indistinguishability and near-unity system efficiency simultaneously.
At the pinnacles of organizations, comparative tests of unity of command and shared command are nearly impossible because only one individual sits atop most organizations. In organizations led by ...co-CEOs, however, such a test is possible because co-CEOs can truly share power. But do they? Our research pits the unity-of-command principle against the shared-command principle and finds overall support for the former, even within the co-CEO context. Our sample of 71 co-CEO pairs at publicly traded U.S. firms shows that increasing power gaps between co-CEOs are positively associated with firm performance. This positive association wanes and turns negative, however, as power gaps become very large. We conclude that whatever benefits the co-CEO structure might offer likely lie outside the shared command paradigm.
In the article, the author analyzes the development of the idea of the unity of Ukraine, contradictions and heterogeneity in interpretive and normative approaches, which were explicitly or latently ...aimed at forming the value orientations of the Ukrainian nation, starting from 1991 until 2014, when the Revolution of Dignity took place. It was revealed that the specified period was characterized by the relentless search and production of new meanings, which had a contradictory nature, on the one hand, they were aimed at the rehabilitation of national history, and on the other hand, they served as a manipulative tool for the formation of public opinion and had a disintegrating effect on Ukrainian society. Special attention was paid to the issue of highlighting the idea of unity in normative and legal acts, in particular those that regulated the rehabilitation of national history and the restoration in the public field of the country of the discourse on the Day of Unity of Ukraine as an event that directly symbolized the aspirations of the Ukrainian people for the establishment of a sovereign and independent state. The article also reveals modifications of the concept of unity in the context of the ideological foundations of the work of a number of public organizations at the national and local levels. It was revealed that the period 1991–2014 was fundamental for the production of new meanings and orientations in nation-building, which ideologically prepared the ground for the events of 2014, the Euromaidan and the Revolution of Dignity, as well as the annexation of Crimea and the occupation of part of Donbas, which marked a new stage a test of the stability of the Ukrainian nation, in particular its unity not only in the symbolic dimension, but also in the practical plane of a direct military conflict, when the context of previous worldview contradictions was removed for the sake of preserving the political unity of the Ukrainian nation, which was subjected to a direct external attack from кussian federation. It was stressed that speculative discussions, discriminatory rhetoric surrounding the concept of the unity of the Ukrainian political nation over time transformed into a political technology of undermining the unity of Ukraine, in particular at the level of popularizing the idea of „incompatibility” and „mutual exclusivity” of the West and East of Ukraine, their economic, cultural, and foreign policy orientations. Political manipulations, multiplied by significant financial and organizational resources, led to the emergence and strengthening of regional political regimes, the actualization of disintegrating separatist political projects.
Stochastic restart may drastically reduce the expected run time of a computer algorithm, expedite the completion of a complex search process, or increase the turnover rate of an enzymatic reaction. ...These diverse first-passage-time (FPT) processes seem to have very little in common but it is actually quite the other way around. Here we show that the relative standard deviation associated with the FPT of an optimally restarted process, i.e., one that is restarted at a constant (nonzero) rate which brings the mean FPT to a minimum, is always unity. We interpret, further generalize, and discuss this finding and the implications arising from it.
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