Blackbody Research Articles

Research on the treatment of black and odorous water bodies in rural areas under the background of rural revitalization

This research addresses the excessive presence of pollutants, such as total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH3-N), and chemical oxygen demand (COD), among others, in rural water bodies that are heavily contaminated and emit a foul odor. The base substrate used in this research consists of nano-particles of ferric chloride. Subsequently, these particles undergo chemical modifications using various agents, such as hydroxybenzoic acid, sodium hydroxide, chitosan, acrylamide, sodium polyacrylate, and zinc sulfate. To alleviate the contamination and foul odor in rural water bodies, the resulting composite material was combined with microbial effective microorganisms (EM) agents and subjected to an aeration process. The findings of this study indicate a significant reduction in the chemical oxygen demand (COD) value over a 70-day experimental period. The COD concentration in the water decreased significantly from 80 mg/L to a mere 15 mg/L, resulting in a reduction percentage of approximately 68.56%. Additionally, the water quality improved from a fifth-class rating, indicating inferior quality, to a third-class rating, denoting a higher quality. The oxidation-reduction potential (ORP) value remained stable at levels below 50 mV, while the redox potential increased fivefold, effectively eliminating black and smelly water. Moreover, the levels of TN and TP also improved from inferior fifth-class to third-class water quality. This research highlights the capacity of using a combination of flocculants and microbial treatments, in aerated environments, to significantly enhance the water quality in heavily contaminated and foul-smelling rural water bodies. The proposed method exhibits the potential to efficiently remediate heavily contaminated and foul-smelling water bodies in small-scale rural regions, indicating its robust scope for future application.

Design of a Single-Element Dynamic Antenna for Secure Wireless Applications

We introduce a new technique for secure wireless applications using a single dynamic antenna. The dynamic antenna supports a constantly and rapidly changing current distribution that generates a radiation pattern that is static in a desired direction and dynamic elsewhere. This imparts additional modulation on the signal and obscures information transmitted or received outside of the information beam, thus achieving directional modulation. Dynamic currents are supported by a single feed that is switched between separate ports on a single antenna, generating two different radiation patterns without changing the physical shape of the antenna. We introduce the theoretical concept by exploring an ideal complex dynamic radiation pattern that remains static in a narrow desired direction and is dynamic elsewhere. The impact on the transmission of information is analyzed, showing that the information beam narrows as the modulation order increases, and design constraints on the spatial width of the information beam as a function of modulation format are determined. We design and analyze a 2.3 GHz two-state dynamic dipole antenna and experimentally demonstrate secure wireless transmission. We demonstrate the ability to change the information beamwidth and steer the information beam experimentally in real time, and to maintain high throughput in the information beam while obscuring the information elsewhere. In contrast to multiport or array-based antennas, our approach introduces a novel rapidly switched single-element technique for secure wireless applications that can be used independently from the rest of the wireless system, essentially operating as a “black box” for an additional layer of security.

Radiation-temperature dependence of water at microwaves

Pure water radiation-temperature dependence at wavelength 8 mm in the temperature range of 30-50 °C has been experimentally investigated. Measurements were made with the microwave radiometer with central frequency 37.5 GHz (wavelength 8 mm). The absolute method of measuring the intensities of distributed radiation was used. A horn with a 30x30 mm opening was used as an antenna. Calibration of the intensity of the received radiation was carried out by its own radiation of a black body at different temperatures. The equipment had a sensitivity (fluctuation threshold) 0.2 K at a time constant τ = 1 sec. An increment of the radio-brightness contrast is about 3 K in this temperature range. The water radio-emission depends non-linearly on the kinetic temperature. It was measured, that effective temperature of the skin-depth layer increases from 0.28 up to 0.4 °C per degree of water heating. It was shown, that the radiation temperature of the water surface for the 8 mm waves and temperature range 30-50 °C is determined not by the bulk kinetic water temperature, but by the effective temperature of the skin-depth layer formed under the influence of heat exchange with the atmosphere.

Z-GAL: A NOEMA spectroscopic redshift survey of brightHerschelgalaxies

We present the dust properties of 125 brightHerschelgalaxies selected from thez-GAL NOEMA spectroscopic redshift survey. All the galaxies have precise spectroscopic redshifts in the range 1.3 <z< 5.4. The large instantaneous bandwidth of NOEMA provides an exquisite sampling of the underlying dust continuum emission at 2 and 3 mm in the observed frame, with flux densities in at least four sidebands for each source. Together with the availableHerschel250, 350, and 500 μm and SCUBA-2 850 μm flux densities, the spectral energy distribution (SED) of each source can be analyzed from the far-infrared to the millimeter, with a fine sampling of the Rayleigh-Jeans tail. This wealth of data provides a solid basis to derive robust dust properties, in particular the dust emissivity index (β) and the dust temperature (Tdust). In order to demonstrate our ability to constrain the dust properties, we used a flux-generated mock catalog and analyzed the results under the assumption of an optically thin and optically thick modified black body emission. The robustness of the SED sampling for thez-GAL sources is highlighted by the mock analysis that showed high accuracy in estimating the continuum dust properties. These findings provided the basis for our detailed analysis of thez-GAL continuum data. We report a range of dust emissivities withβ ∼ 1.5 − 3 estimated up to high precision with relative uncertainties that vary in the range 7%−15%, and an average of 2.2 ± 0.3. We find dust temperatures varying from 20 to 50 K with an average ofTdust ∼ 30 K for the optically thin case andTdust ∼ 38 K in the optically thick case. For all the sources, we estimate the dust masses and apparent infrared luminosities (based on the optically thin approach). An inverse correlation is found betweenTdustandβwithβ ∝ Tdust−0.69, which is similar to what is seen in the local Universe. Finally, we report an increasing trend in the dust temperature as a function of redshift at a rate of 6.5 ± 0.5 K/zfor this 500 μm-selected sample. Based on this study, future prospects are outlined to further explore the evolution of dust temperature across cosmic time.

Re-reading Fatima Meer's Prison Diary and art through the lens of Saidiya Hartman's concept of ‘stealing away’

ABSTRACT This paper interprets and analyses the concept of stealing away, as a redemptive act, that can be embodied in alternative modes such as writing, painting and drawing. The paper articulates how the pained body – which in this case is understood as the black body – emerges in an oppressive environment. This paper considers prison letters and artwork as redefinition, redress, and reconfiguration of the pained body. The core of this discussion is founded on how Fatima Meer steals away through her writing and artwork while she is imprisoned. These actions constitute self-affirmation over oppression which essentially exemplifies how Saidiya Hartman expresses stealing away as a concept. It is through acts of stealing away that Meer experiences embodied writing, which is about bringing the finely textured experiences of the body to the art of writing. In so doing the pained experiences of the body [Meer] are reclaimed from oppression through writing, drawing and painting.

LA INERCIA DE LA LUZ. VERIFICACIÓN DE LA SEGUNDA LEY DE NEWTON POR PARTE DE UN FLUJO DE RADIACIÓN CONFINADO EN UNA CAVIDAD REFLECTANTE

In 1904, the Austrian physicist Fritz Hasenöhrl examined by means of mental experiments the black body radiation in a reflecting cavity. By calculating the work required to keep the cavity moving at constant velocity in opposition to the radiation pressure, he calculated for the radiation energy a value equivalent to E =38mc2 relation corrected in 1905 to E=34mc2. This relation establishes an equivalence between mass m and radiation energy E and was finally corrected to the present known form E = mc2 by Einstein. The conclusion from these deductions is that light has mass and inertia. Based on a thought experiment inspired by Hasenöhrl’s, in which we accelerate a reflecting cavity containing an internal radiation flux, we conclude that, under certain conditions of motion, light verifies Newton’s 2nd Law of Inertia

Advanced efficient strategy for detection of dark objects based on spiking network with multi-box detection

Advanced efficient strategy for detection of dark objects based on spiking network with multi-box detection

Reading emotion, reading joy: South Africa’s literary non-scenes

ABSTRACT #Fallism has taken South African literature to a precipice. A growing mistrust in the country’s postcolonial politics and the continuing physical and economic oppression of black bodies – captured in the spirit of #RhodesMustFall – has led to a questioning of the rational desire to ‘put into words’. The radical social and political change required, critics imply, can no longer be adequately understood through the certainty of the written form: The path to a true decolonial future is in live art. This paper uses these suggestions as a springboard but refuses to accept the ‘death of the text’ that is implied. Rather I utilise interventions from the 1980s to once again encourage the academy to recognise the power of ‘literary non-scenes’ where the performed and the written interact. Moreover, I argue that scholars should begin to read for emotion and, in so doing, open the space for the expression of Black joy.

The common fundamental plane of X-ray emissions from pulsars and magnetars in quiescence

ABSTRACT Magnetars are a unique class of neutron stars characterized by their incredibly strong magnetic fields. Unlike normal pulsars whose X-ray emission was driven by rotational energy loss, magnetars exhibit distinct X-ray emissions thought to be driven by their strong magnetic fields. Here, we present the results of magnetar X-ray spectra analysis in their quiescent state. In the sample studied in this paper, spectra of 17 magnetars can be fitted well with a model consisting of a power-law and a blackbody component. We found that the luminosity of the power-law component can be described by a function of blackbody temperature and emission-region radius. The same relation was seen in pulsars whose X-ray emission mechanism is thought to be different. The fact that these magnetars and pulsars share a common fundamental plane in the space spanned by non-thermal X-ray luminosity, surface temperature, and the radius of the thermally emitting region presents both challenges and hints to theoretical models for a complete comprehension of the magnetospheric emissions from these two classes of neutron stars.

Gaia BH1: A Key for Understanding the Demography of Low-q Binaries in the Milky Way Galaxy

The recently discovered Gaia BH1 binary system, a Sun-like star and a dark object (presumably a black hole), may significantly change our understanding of the population of binaries. The paper presents the components mass ratio (q) distributions of binary systems of different observational classes. They all show a significant shortage of low-q systems. In this work, I demonstrate (quantitatively) how our ignorance extends, and point out the importance of discovering and studying systems like Gaia BH1. In addition, an approximate mass–temperature relation and mass ratio–magnitude difference relation for main-sequence stars are presented here.

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[Title Erased] 
 [Name author Erased]
 Abstract 
 In this paper I describe the collective performance entitled [Titleerased] [reference erased]. The performance was part of the programme [“”], an event on black feminisms. The particular performance(s) performed at [author+title erased] are in this sense rehearsals of the particular positioning of upside down and a web of other various positionings and performances that emerged under this context. The performance assumed the performative conversational form in a long table with the participants. Departing from the idea of positioning as performative or even more mundanely as a position assumed in, with or within black bodies the conversational performance framed questions and speculated about particular positionings.
 In this regard, the performative table echoes Glissant’s (2010) sensibility in a belief that things, concepts, ideas do not necessarily follow a transparent deductive course but are often the product of intuitively complex networks in relation. In other respects, these performance(s) reflect a relevant aspect of dance practice. As a praxis – without forgetting its highly oral facet – dance is characterized by “a radical hospitality” towards unfamiliar “languages, unknown processes without evident protocols or contracts” [erased] and in many respects opaque. Opaque to the body, the performers and other various intervenients under choreographic performative processes or trainings.

Badanie skuteczności materiałów siatek maskujących w aspekcie obserwacji z pozycji BSP

This article presents the results of aerial observations conducted using infrared airborne surveillance platforms. The observation conditions closely resembled real battlefield conditions. The observation results were compared with laboratory studies that utilized a black body reference to measure the radiative transmission of 11 different masking nets materials. The research referred to the measured transparency coefficient of the tested materials. The conducted research indicates that there is no consistent correlation between transparency in visible light and infrared radiation passing through the masking material for the tested materials. Considering that camouflage meshes and the materials from which they are made have become highly sought-after equipment on the modern battlefield, with many entities initiating their production, there is a strong need to develop a rapid method for assessing the suitability of such materials in terms of thermal camouflage. The study proposes the utilization of a simple camouflage evaluation index based on transparency in two spectral ranges.

Pieces Separation Applied to a RV-2AJ Industrial Manipulator

The objective of this work is to create a system for separating types of pieces for didactic purposes. An artificial vision system applied to a manipulator was used to perform this task of classifying and separating the pieces, through the use of digital image processing. The vision system uses a camera attached to the robot's end-effector, whose objective is to identify the area, perimeter and position of the centroid of the pieces to be separated. The separation of objects is performed between two classes: with round and non-round shapes. The tests were carried out with objects such as screws and nuts. After obtaining the positions of the objects to be separated by the vision system, some characteristics of these related to the reference system of the robot base are determined. Some difficulties were observed in the recognition of objects related to the colours and lighting conditions of the separation environment. To reduce these problems, black colour objects were used in order to reduce the reflectance. Another problem encountered in the separation process is related to the relative position of objects. In this case, two or more objects can be identified as a single object, depending on their relative positions. The system classifies with a rate of hits greater than 95%.

Astrophysical and electromagnetic emissivity properties of black holes surrounded by a quintessence type exotic fluid in the scalar–vector–tensor modified gravity

The astrophysical consequences of the presence of a quintessence scalar field on the evolution of the horizon and on the accretion disk surrounding a static black hole, in the scalar–vector–tensor version of modified gravity (MOG), are investigated. The positions of the stable circular orbits of the massive test particles, moving around the central object, are obtained from the extremum of the effective potential. Detailed calculations are also presented to investigate the light deflection, shadow and Shapiro effect for such a black hole. The electromagnetic properties of the accretion disks that form around such black holes are considered in detail. The energy flux and efficiency parameter are estimated analytically and numerically. A comparison with the disk properties in Schwarzschild geometry is also performed. The quantum properties of the black hole are also considered, and the Hawking temperature and the mass loss rate due to the Hawking radiation are considered. The obtained results may lead to the possibility of direct astrophysical tests of black hole type objects in modified gravity theories.

Four new saproxylic species of Paranura Axelson, 1902 (Collembola: Neanuridae: Neanurinae) from Japan.

Four new saproxylic species of the genus Paranura from Nagasaki, Nara, and Niigata provinces of Japan are described and illustrated in this paper. Paranura tsushimaensis sp. nov. is characterized by a dark blue body color, Abd. V four times as long as Abd. VI, 3+3 eyes, three ocular chaetae on the head, four ordinary chaetae De on Th. III, two ordinary chaetae Di on Abd. V, and all dorsal chaetae of Abd. VI in a unique reticulated plate. P. nakamurai sp. nov. is identified by its yellowish white body color, 2+2 eyes, tubercle Af on the head with two reticulated tubercles, and tubercles Di on Abd. V fused. P. alpicola sp. nov. is characterized by its yellow body color, 3+3 eyes, presence of complete chaetotaxy in the central area of the head, Th. IIIII with two and three ordinary chaetae De respectively, and tubercles Di on Abd. V separate. P. convallis sp. nov. is identified by its orange body color, 3+3 eyes, head without chaeta O, three mandibular teeth, and Th. IIIII with three and four ordinary chaetae De respectively. A key for all species of the genus Paranura is provided.

Horrifying Whiteness and Jordan Peele's Get Out

Abstract: Horrifying whiteness is a lens by which to read the paradox of white supremacists rendering Blackness as monstrous even as they terrorize Black people by executing physical and institutional attacks against them. As its name suggests, horrifying whiteness evokes the complex relationship between white supremacy and the horror genre calling attention to the violent white supremacist performances that are enacted on and off the big screen. In this article, I introduce my concept of horrifying whiteness which draws from previous Black scholarship on the gaze such as Frantz Fanon's Black Skin, White Masks (1952) and bell hooks's Black Looks: Race and Representation (1992) but distinguishes itself by rendering white supremacy and the gaze as horrific via the horror genre. As a case in point, Jordan Peele's Get Out (2017) epitomizes horrifying whiteness through its depiction of the Armitages and their clients who mask themselves as good innocent white people while they privately abduct and sell/purchase Black bodies and exploit them. By reading Peele's Get Out through the lens of horrifying whiteness, I consider how horror frameworks not only challenge white denial and white innocence, but provide a lens through which Black vulnerability can perhaps be most clearly seen.

Racial, Gender, and Size Bias in a Medical Graphical Abstract Gallery: A Content Analysis.

Graphical abstracts may enhance dissemination of scientific and medical research but are also prone to reductionism and bias. We conducted a systematic content analysis of the Journal of Internal Medicine (JIM) Graphical Abstract Gallery to assess for evidence of bias. We analyzed 140 graphical abstracts published by JIM between February 2019 and May 2020. Using a combination of inductive and deductive approaches, we developed a set of codes and code definitions for thematic, mixed-methods analysis. We found that JIM graphical abstracts disproportionately emphasized male (59.5%) and light-skinned (91.3%) bodies, stigmatized large body size, and overstated genetic and behavioral causes of disease, even relative to the articles they purportedly represented. Whereas 50.7% of the graphical surface area was coded as representing genetic factors, just 0.4% represented the social environment. Our analysis suggests evidence of bias and reductionism promoting normative white male bodies, linking large bodies with disease and death, conflating race with genetics, and overrepresenting genes while underrepresenting the environment as a driver of health and illness. These findings suggest that uncritical use of graphical abstracts may distort rather than enhance our understanding of disease; harm patients who are minoritized by race, gender, or body size; and direct attention away from dismantling the structural barriers to health equity. We recommend that journals develop standards for mitigating bias in the publication of graphical abstracts that (1) ensure diverse skin tone and gender representation, (2) mitigate weight bias, (3) avoid racial or ethnic essentialism, and (4) attend to sociostructural contributors to disease.

Bloody Edification: The Violence of Education in Sutton Griggs's Imperium in Imperio

Abstract: This article contends that scenes and themes of education in Sutton Griggs's Imperium in Imperio deploy the threat of corporal punishment as a means of reincarnating antebellum plantation systems of surveillance and punishment in the postbellum school space. By copiously tracing the logic and references in a commentary on education by a parson early in the novel, the article shows that Griggs's book makes learning, violence, and space inextricable in Black Reconstruction life. Drawing on theorists like Hortense Spillers and Karen Sanchez-Eppler, who argue that violence on the body renders Black bodies legible, I suggest that Black education manifests itself through the same bodily terror that dictated life for enslaved persons. Griggs, I propose, depicts knowledge accumulation and dissemination as harmful to the Black populace not only physically but politically as well. With an eye towards the book's eponymous Black insurrectionary state, this article argues that the plantation's regime of intimidation, which continues to impose itself through the illusion of academic installation, might be overturned through a motivated manipulation of space.

Under the Influence: Marijuana, the Black Male Athlete, and Alternative Understandings of Humanity

This paper analyzes a series of advertisements from the antidrug campaign Above the Influence and interviews of former National Football League and National Basketball Association players by the website Bleacher Report regarding their marijuana use. Guided by Christina Sharpe’s theoretical concept of the “wake,” I argue that the Above the Influence adverts produce a trope I call Chronic Black male sporting hood. A trope that holds the Black body in a state of dehumanization. The second half of this paper utilizes Sharpe’s Black methodological tool of Black annotation/redaction. Through this Black methodological tool, the testimonial of the athletes, and the influences of Black musicians, I argue that these athletes provide insight into alternative ways of living and being human that arise from the anti-Black practices of sport with marijuana serving as their catalyst.

Application of Problem-Based Learning Model (PBL) as an Effort to Overcome Misconceptions in Black Body Radiation Material

Physics cannot be separated from things that are conceptual. The concept of physics is a description or definition of the physical variables that exist in events in the universe. It's just that, often there is a problem in students' understanding of concepts where there is a discrepancy between the definitions that are understood and those conveyed by experts. This problem is called a misconception. Misconceptions can occur because the concepts that students understand through observation of everyday events are different from the theories obtained in the learning process in class, one of which is on black body radiation material. One learning model that can overcome misconceptions is a problem-based learning model or Problem Based Learning (PBL). The purpose of this study was to reduce misconceptions about black body radiation and to determine the effectiveness of PBL in overcoming misconceptions about black body radiation. This research is a type of experimental research using a pre-experimental design pre-test post-test group. The results showed that PBL can reduce misconceptions and is quite effective as an effort to reduce misconceptions about black body radiation material marked with an N-Gain value of 0.55.