Exclusion Principle Research Articles

Teacher Training and Inclusive Physical Education under analysis

The April 1974 50th anniversary is a reminder of the substantial changes in the field of education in which, from the principles of exclusion and discrimination, the concept of education democratization was broadened to represent an important space for social advancement. Alongside the massification of the education system, the ideas of inclusion emphasize the need for schools to recognize the added value of the diversity of their students, finding ways to deal with differences, adjusting teaching processes to the individual characteristics and conditions of each student, challenging teachers to configure inclusive and equitable educational practices. Teacher training should focus on student-centered teaching, fostering inclusive education and collaborative learning.

Problems and prospects of technocratic model of government

The paper deals with technocracy as one of the ways to organize the political life of society and variants of the state system. The paper analyzes the concept of technocracy and provides an overview of the main classical concepts of technocracy. It states that the concept of technocracy does not have an unambiguous definition, but has three basic features. Classical technocracy relies on the principle of exclusivity and the ideal of aristocratic rule laid down in Plato’s writings. The paper describes a new -deliberative model of technocracy, tailored on the principle of inclusiveness. Deliberative technocracy is a kind of technocracy by which political (and, in particular, state) decisions are taken based on expert opinion. Expert opinion is shaped following intellectual operations and is delineated in expert findings. Deliberative technocracy proclaims neither the power of abstract demos (mass men) nor the power of intellectual aristocracy. Deliberative technocracy brings a new force onto the political stage, otherwise referred to as experts. Thus, deliberative technocracy implies the majority rule, not the minority... but it is the rule of a qualified and competent majority.

An exact one-particle theory of bosonic excitations: from a generalized Hohenberg–Kohn theorem to convexified N-representability

Motivated by the Penrose–Onsager criterion for Bose–Einstein condensation we propose a functional theory for targeting low-lying excitation energies of bosonic quantum systems through the one-particle picture. For this, we employ an extension of the Rayleigh–Ritz variational principle to ensemble states with spectrum w and prove a corresponding generalization of the Hohenberg–Kohn theorem: the underlying one-particle reduced density matrix determines all properties of systems of N identical particles in their w -ensemble states. Then, to circumvent the v-representability problem common to functional theories, and to deal with energetic degeneracies, we resort to the Levy–Lieb constrained search formalism in combination with an exact convex relaxation. The corresponding bosonic one-body w -ensemble N-representability problem is solved comprehensively. Remarkably, this reveals a complete hierarchy of bosonic exclusion principle constraints in conceptual analogy to Pauli’s exclusion principle for fermions and recently discovered generalizations thereof.

Limits on the cosmic neutrino background

We present the first comprehensive discussion of constraints on the cosmic neutrino background (CνB) overdensity, including theoretical, experimental and cosmological limits for a wide range of neutrino masses and temperatures. Additionally, we calculate the sensitivities of future direct and indirect relic neutrino detection experiments and compare the results with the existing constraints, extending several previous analyses by taking into account that the CνB reference frame may not be aligned with that of the Earth. The Pauli exclusion principle strongly disfavours overdensities ην ≫ 1 at small neutrino masses, but allows for overdensities ην ≲ 125 at the KATRIN mass bound mν ≃ 0.8 eV. On the other hand, cosmology strongly favours 0.2 ≲ ην ≲ 3.5 in all scenarios. We find that direct detection proposals are capable of observing the CνB without a significant overdensity for neutrino masses mν ≳ 50 meV, but require an overdensity ην ≳ 3 × 105 outside of this range. We also demonstrate that relic neutrino detection proposals are sensitive to the helicity composition of the CνB, whilst some may be able to distinguish between Dirac and Majorana neutrinos.

Induction of intelligence into molecules by using spinor radiation: an alternative to water memory

<abstract> <p>By injecting a string of spinors within a membrane, it becomes sensitive to external magnetic fields. Without external magnetic fields, half of the spinors in this string have opposite spins with respect to the other half and become paired with them within membranes. However, any external magnetic field could have a direct effect on this system because a magnetic field could make all spinors parallel. According to the exclusion principle, parallel spinors repel each other and go away. Consequently, they force the molecular membrane to grow. By removing external fields, this molecule or membrane returns to its initial size. An injected string of spinors could be designed so that this molecule or membrane is sensitive only to some frequencies. Particularly, membranes could be designed to respond to low frequencies below 60 Hz. Even in some conditions, frequencies should be lower than 20 Hz. Higher frequencies may destroy the structure of membranes. Although, by using some more complicated mechanisms, some membranes could be designed to respond to higher frequencies. Thus, a type of intelligence could be induced into a molecule or membrane such that it becomes able to diagnose special frequencies of waves and responses. We tested the model for milk molecules like fat, vesicles, and microbial ones under a 1000x microscope and observed that it works. Thus, this technique could be used to design intelligent drug molecules. Also, this model may give good reasons for observing some signatures of water memory by using the physical properties of spinors.</p> </abstract>

Other, Change, Time

The theme of the Other remains relevant for both researchers and ordinary people. In the current world of information, characterized by increased social variability, the dynamics of becoming different (which is present in the life of any social subject) is regarded by author as an additional argument in favor of an empathic approach to the Other. Comprehension of one's own internal searches and various social relations is inscribed in the multi-layered social dynamics determined by various actors and their conceptualization (including ideological) of what is happening in the running time. The correlation of the problem of the Other with the theme of change in time is fruitful both ethically, psychologically, and politically, because it is consistent with the request for social integration both within certain groups and on a global scale. The grounds for integration largely determine its character. The shift in the public focus of evaluation, criticism (up to prohibition) from the social actor to his/her specific actions is justified by the democratic tendency in operating with the principle of social exclusion

Development of TiO2/polyvinyl alcohol-cellulose acetate nanocomposite reverse osmosis membrane for groundwater-surface water interfaces purification

The conventional water treatment processes have limits to overcome the gap between available water sources and the water demand. So desalination is required to face this challenge. In this study, polyvinyl alcohol (PVA) blended cellulose acetate (CA) membranes incorporated nano-rods TiO2 (NRTiO2) using various concentrations from 0.1 to 0.7 wt%. Membrane hydrophilicity increased as NRTiO2 loading increased, whereas tiny additions of NRTiO2 0.5 wt% resulted in higher tensile strength (8.7 MPa) and tensile modulus (67 MPa). A 10,000 mg/L NaCl solution was used to evaluate fabricated membranes, optimized membrane performance was achieved with 0.5 wt% NRTiO2, with a salt rejection (Rs) 99.52 % and a flux increase of 34.2 %. As a result, adding (NRTiO2) to the polymer solution creates water paths that make water flow easier. Furthermore, the PVA-CA-NRTiO2 membranes had a significant salt rejection due to the (NRTiO2) irregular's crystal shape, the size exclusion principle, and the ion exchange mechanism. NRTiO2membrane was applied for surface water treatment and was recommended for this water source. This membrane reached the highest removal percent with 100 % for COD and BOD5. In addition the dissolved solids and chlorides were exceeding 90 %. As well as this membrane will be promising for groundwater-surface water interfaces.

One hundred years ago Alfred Landé unriddled the Anomalous Zeeman Effect and presaged electron spin

In order to commemorate Alfred Landé’s unriddling of the anomalous Zeeman Effect a century ago, we reconstruct his seminal contribution to atomic physics in light of the atomic models available at the time. Landé recognized that the coupling of quantized electronic angular momenta via their vector addition within an atom was the origin of all the apparent mysteries of atomic structure as manifested by the anomalous Zeeman effect. We show to which extent Landé’s ideas influenced the development of quantum physics, particularly Wolfgang Pauli’s path to the exclusion principle. We conclude with Landé’s brief biography.

Behaviorally mediated coexistence of ocelots, bobcats and coyotes using hidden Markov models

The competitive exclusion principle states that ecologically similar species will be unable to coexist due to competition for resources, however, similar species coexist across a variety of ecosystems. Understanding mechanisms of coexistence is essential for managing a target species. Advances in monitoring technology have provided the ability to obtain reliable, high‐frequency data on wildlife. From these data, behavioral states can be approximated by analyzing turning angles and distances between locations. We monitored 8 ocelots Leopardus pardalis, 13 bobcats Lynx rufus and 5 coyotes Canis latrans on the East Foundation's El Sauz Ranch and the Yturria San Francisco Ranch in south Texas, USA, which were fitted with GPS collars that collected locations every 30 min. We characterized behavioral states using hidden Markov models. We assumed low turning angles and longer steps to represent patrolling territory, larger turning angles with shorter steps would represent hunting behavior, and low angles and minimal movement would indicate periods of rest. If differences in timing and space use exist between species, these differences may help facilitate coexistence. We predicted 1) each species exhibits three behavioral states: resting, hunting and territory patrolling; 2) ocelots moved farther (i.e. territory patrolling) in open areas and rested in dense cover; and 3) bobcats and coyotes would remain in more open areas than ocelots. We found ocelots and bobcats remained closer to heavy cover when resting and foraging and used open areas more when patrolling territory while coyotes rested in the open and selected for cover when hunting or patrolling. Further, we found evidence of temporal partitioning of behaviors both within and across species. Our study provides a novel approach to examining coexistence and identifies behaviorally mediated spatial and temporal differences in habitat use that may facilitate coexistence between ocelots, bobcats and coyotes.

Full counting statistics in the many-body Hatano-Nelson model

We study non-hermitian many-body physics in the interacting Hatano-Nelson model with open boundary condition. The violation of reciprocity, resulting from an imaginary vector potential, induces the non-hermitian skin-effect and causes exponential localization for all single particle eigenfunctions in the non-interacting limit. Nevertheless, the density profile of the interacting system becomes only slightly tilted relative to the average filling. The Friedel oscillations exhibit a beating pattern due to the modification of the Fermi wavenumber. The probability distribution of particles over any finite interval is the normal distribution, whose mean scales with the imaginary vector potential and the variance is symmetric to the center of the chain. This is confirmed by several numerically exact methods even for relatively small systems. These features are expected to be generic not only for fermions, which naturally repel each other due to Pauli's exclusion principle, but for interacting bosons as well. Our findings indicate that many-body effects can significantly alter and conceal the single particle properties and the skin effect in non-hermitian systems.

Particle Production in Strong Electromagnetic Fields and Local Approximations

We investigate the phenomenon of electron–positron pair production in intense external backgrounds within the strong-field regime. We perform nonperturbative calculations by solving the quantum kinetic equations, and obtain the momentum distributions of particles created and the total number of pairs. In particular, we analyze the validity of the locally constant field approximation (LCFA), which represents a powerful method for treating inhomogeneous external backgrounds. We consider a combination of two consecutive time-dependent Sauter pulses and thoroughly examine the effects of quantum interference and the role of the Pauli exclusion principle. It is shown that the latter can be approximately incorporated within the LCFA when computing the momentum distributions, while the closed-form LCFA expression for the total particle yield completely disregards Pauli blocking. It is demonstrated that in the presence of multiple turning points of classical electron trajectories, one observes interference patterns in the particle spectra, and the LCFA may significantly overestimate the number of pairs. To further elaborate this issue, we perform the analogous calculations in the case of scalar QED. It is shown that the quantum statistics effects enhance the number of bosons produced.

Interspecific interactions among three species of sea turtle using a common resting area.

Interspecific interactions among three species of sea turtle using a common resting area.

Pauli blocking of stimulated emission in a degenerate Fermi gas

The Pauli exclusion principle in quantum mechanics has a profound influence on the structure of matter and on interactions between fermions. Almost 30 years ago it was predicted that the Pauli exclusion principle could lead to a suppression of spontaneous emission, and only recently several experiments confirmed this phenomenon. Here we report that this so-called Pauli blockade not only affects incoherent processes but also, more generally, coherently driven systems. It manifests itself as an intriguing sub-Doppler narrowing of a doubly-forbidden transition profile in an optically trapped Fermi gas of 3He. By actively pumping atoms out of the excited state, we break the coherence of the excitation and lift the narrowing effect, confirming the influence of Pauli blockade on the transition profile. This insight into the interplay between quantum statistics and coherent driving is a promising development for future applications involving fermionic systems.

Lessons from the famous 17th‐century paradox of the Chevalier de Méré

AbstractWe take advantage of a combinatorial misconception and the famous paradox of the Chevalier de Méré to present the multiplication rule for independent events; the principle of inclusion and exclusion in the presence of disjoint events; the median of a discrete‐type random variable, and a confidence interval for a large sample. Moreover, we pay tribute to our original bibliographic sources by providing two computational tools to facilitate the students' insights on these topics.

Investigation of Amperometric Sensing Mechanism in Gold–C60–Gold Molecular Dot

We investigate through simulations the gold–C60–gold molecular junction as a novel single-molecule amperometric gas sensor. We find it promising for NO and NO2 detection in air and at room temperature, with current variations of the order of the microampere, and presenting the potential capability of achieving the single-molecule sensitivity along with selectivity in the presence of common atmospheric gases. Furthermore, and for the first time, we investigate the current modulation mechanism due to target–sensor intermolecular interactions, providing theoretical insights into the functioning and exclusive properties of this novel device. In particular, we show and motivate the peculiar voltage-dependent response of the sensor that we relate to the distinctive mechanism of transport modulation occurring in the presence of a specific target. Finally, we discuss sensing reliability in air and the effects of probable fabrication process variability on sensing performance. Our results motivate future works on molecular dot-based chemical sensors in terms of the sensor–target exclusive interactions and detection principles, oriented to device-level engineering to find optimal operating conditions.

Competitive exclusion in a model with seasonality: Three species cannot coexist in an ecosystem with two seasons

Chan, Durrett, and Lanchier introduced a multitype contact process with temporal heterogeneity involving two species competing for space on the d-dimensional integer lattice. Time is divided into two seasons. They proved that there is an open set of the parameters for which both species can coexist when their dispersal range is sufficiently large. Numerical simulations suggested that three species can coexist in the presence of two seasons. The main point of this paper is to prove that this conjecture is incorrect. To do this we prove results for a more general ODE model and contrast its behavior with other related systems that have been studied in order to understand the competitive exclusion principle.

Competitive exclusion of two viral strains of COVID-19.

The pandemic COVID-19 has caused severe losses in public health and economy. One of the most difficult problems in prevention of the disease spread is the emergence of new variants. In this paper, a mathematical model is formulated, which captures the main feature of COVID-19 spread with two viral strains. It is shown by analytical method that the model exhibits the competitive exclusion principle, where one viral strain with the larger basic reproduction number is dominant and the viral strain with the smaller reproduction number is excluded. The results are important for the deployment of prevention policy of COVID-19.

Acid-Modified ZnO Nanoparticles Embedded Polysulfone Membranes for Separation of Copper from Industrial Wastewater

Copper is one of the crucial materials for the biological activity of human beings and is known for antimicrobial properties during wound management. Hence its presence in the effluent is overlooked although it is reported to be detrimental at higher concentrations. Its effect on humans varies from simple dizziness, diarrhea to liver/kidney damage, etc. Various techniques are reported for separation of these toxic pollutants from effluent. This article focuses on development of polysulfone-based membranes with use of additives: polyethylene glycol (PEG) and ZnO nanoparticles (NPs) (nascent and modified with HCl) for separation of copper from effluent by Donnan Exclusion principle. The incorporation of acid treated ZnO NPs in membrane matrix provides surface charge to membrane. This results in repulsive interaction with copper salts from process which retained in retentate as per Donnan exclusion principle. The membrane formed with 40% PSF- 0.8% ZnO NPs shows the rejection of copper up to 40%, which raises to 61% when instead of nascent NPs, HCl treated NPs were used. The rejection efficiency of the membrane raises up to 90% when PEG was used along with PSF and ZnO NPs (acid treated). The use of modified NPs in membrane matrix has strong impact on membrane morphology and rejection efficiency. The modification of surface charge properties and morphological distribution of NPs is supported by FTIR and EDX. Further the separation works upon physical distribution of NPs, which would help to maintain the stability properties of PSF based membrane enhancing its applicability in actual process conditions.

Aggregated Distribution as an Explanation for the Paradox of Plankton and Collective Animal Behavior.

Simple SummaryECA is similar to a cellular automaton that mimics the evolutionary dynamics of species in metapopulations, simulating the underlying mechanisms of natural selection. In this work, we carry out an in-silico study of the effects of different dispersal strategies on the evolutionary balance of interactions between digital organisms. In ECA we see how a specific type of distribution can significantly influence the dynamics, persistence, distribution, and abundance of populations of different species within a particular habitat. In the first place, we show that an aggregate distribution is more inefficient than a uniform distribution. Still, we verify that this aggregate distribution is essential in predator–prey type interactions so that the species involved do not become extinct. We also show that the aggregate distribution does not comply with the competitive exclusion principle and, for this reason, it results in a general and straightforward explanation for the paradox of plankton and the grouping of animals. Many animals and especially some planktonic species group together in specific spaces, although some travel adrift, leaving other areas or patches free where competitors or their prey can prosper, preventing them from becoming extinct.This work analyzes the evolutionary consequences of different aggregation levels of species distribution with an Evolutionary Cellular Automaton (ECA). We have found that in habitats with the same carrying capacity, aggregated distributions preserve smaller populations than do uniform distributions, i.e., they are less efficient. Nonetheless, we have also found that aggregated distributions, among other factors, can help the evolutionary stability of some biological interactions, such as predator–prey interactions, despite their granting less individual fitness. Besides, the competitive exclusion principle does not usually stand in populations with aggregated distribution. We have applied ECA to study the effects of aggregated distribution in two notorious cases: in the so-called paradox of the plankton and in gregarious animals. In doing so, we intend to ratify long-established ecological knowledge explaining these phenomena from a new perspective. In the first case, due to aggregate distribution, large aggregations of digital organisms mimicking very abundant planktonic species, leave large patches or oceanic areas free for other less competitive organisms, which mimic rare species, to prosper. In this case, we can see how effects, such as ecological drift and the small portion, act simultaneously. In the second case of aggregation, the aggregate distribution of gregarious animals could be explained under specialized predator–prey interactions and interdemic competition. Thus, digital organisms that imitate predators reduce the competitive capacity of their prey, destabilizing their competitiveness against other species. The specialized predator also goes extinct if the prey goes extinct by natural selection. Predators that have an aggregate distribution compensate the prey and thus avoid exclusion. This way there are more predator-free patches in which the prey can prosper. However, by granting greater colonization capacity to its prey, the predator loses competitiveness. Therefore, it is a multilevel selection event in which group adaptation grows to the detriment of the predator as an individual.

Quantum contribution to luminosity of quasars

The accretion of galactic gas is regarded as the source of the giant luminosity of quasars. The gravitational energy converts itself into radiation close to the Schwarzschild horizon of the central supermassive black hole with efficiency of ca. 30% mass to radiation energy conversion rate. Particularities of such an extremely effective mechanism of mass to energy conversion are, however, still obscure. We propose to take into account quantum statistics properties of fermions, which could emit in close outer vicinity of the Schwarzschild zone a giant energy accumulated in the Fermi spheres of electrons and protons in degenerate quantum collective state created in this region by the gravitational compression of plasma. The release of photons is possible due to the local revoking of Pauli exclusion principle constraint induced by the rapid change of the homotopy of multiparticle trajectories beneath the innermost unstable circular orbit of the black hole, which causes the collapse of Fermi spheres of electrons and protons.