Formation of heat and mass transfer bonds when mixing components in a suspended state

The method of preparation of wheat paste based on discrete and impulse influence on components is revealed. The basis of the research of the vapors preparation method is the formation of a liquid mixture of interacting dosing components in a suspended state. The interaction occurs due to the humidification of the pulverulent suspended state of the layer of flour particles by a scattered jet of liquid under pressure. The development of this technological process and equipment is considered. A thorough analysis of the mixing of components in a suspended state. The influence of a set of experimental and theoretical researches is noted, where the results of the theoretical direction are aimed at the creation of mathematical models, simulation of the process with the use of the possibility of computer engineering. The characteristics of thermal processes for the transition region from the surface of the flour to the massive formed medium are given, taking into account the effective thermophysical characteristics of the medium in the form of dependences obtained theoretically and experimentally. Dependencies are taken into account as well as heat and mass transfer processes when the liquid phase interacts with flour: external heat and mass transfer processes when interacting in a suspended state on the flour surface and change of working environment with the formation of bonds, and internal mass transfer processes when moving moisture and heat inside the flour particle.

Analysis of the Influencing Factors of FDM-Supported Positions for the Compressive Strength of Printing Components

Fused deposition modeling (FDM) has the advantage of being able to process complex workpieces with relatively simple operations. However, when processing complex components in a suspended state, it is necessary to add support parts to be processed and formed, which indicates an excessive dependence on support. The stress intensity of the supported positions of the printing components can be modified by changing the supporting model of the parts, their density, and their distance in relation to the Z direction in the FDM printing settings. The focus of the present work was to study the influences of these three modified factors on the stress intensity of the supporting position of the printing components. In this study, 99 sets of compression tests were carried out using a position of an FDM-supported part, and the experimental results were observed and analyzed with a 3D topographic imager. A reference experiment on the anti-pressure abilities of the printing components without support was also conducted. The experimental results clarify how the above factors can affect the anti-pressure abilities of the supporting positions of the printing components. According to the results, when the supporting density is 30% and the supporting distance in the Z direction is Z = 0.14, the compressive strength of the printing component is lowest. When the supporting density of the printing component is ≤30% and the supporting distance in the Z direction is Z ≥ 0.10, the compressive strength of printing without support is greater than that of the linear support model. Under the same conditions, the grid-support method offers the highest compressive strength.

Improvement of the technology for processing siderite ore from the Bakal deposit

The Urals is one of the unique iron ore provinces of the world, including all the variety of iron ores. Siderite ores are represented by the Bakal group of deposits, in which siderite in mineralogical terms is not a chemically pure iron carbonate, but has an isomorphic admixture of magnesium and calcium, forming sideroplesite and pistomesite. The main iron ore mineral of the siderite ore of this deposit is an isomorphic mixture of iron, magnesium and manganese carbonates, which occur in different quantitative ratios. A scheme for ore dressing is proposed, which includes crushing to a size of 10-0 mm and dry magnetic separation in a suspended state at a magnetic field strength of 52 k/m. The study of dry magnetic separation of siderite ore was carried out on a suspended separator with a constant magnetic field and on an electromagnetic separator 138T-SEM. The resulting magnetic fraction is sent to the baking, subsequent crushing to a size of 2-0 mm and dry magnetic separation in the suspended state. To increase the mass fraction of iron and reduce the mass fraction of magnesium oxide, the magnetic fraction is sent for grinding and wet magnetic separation. The results of the experiments have showed that the enrichment using high-intensity dry magnetic separation of siderite ore from various sections of the deposit, the mass fraction of MgO decreased from 9.4-12.3% to 8.0-10.1%, and the mass fraction of iron increased from 28.8-33.4% to 31.4-40.8%. As a result, a product with a mass fraction of iron 59.3-60.1% and magnesium oxide 10.0-11.3% has been obtained. The developed enrichment technology allows us to obtain conditioned raw materials, which can serve as a promising raw material for PJSC Magnitogorsk Iron and Steel Works (PJSC MMK)

The Computer as a Queer Object

There have been many different definitions of queerness: indeterminacy, the other, the becoming yet not quite reaching a conclusion. In some senses, queerness is an animated, yet static and suspended state of metamorphosis in which an unimagined creature never crawls out to be fixed. What would happen if we take this animation and image toward computers? What feats could we accomplish? Computers have been studied in its breadth of militaristic, hierarchical, and binary logics; elements which repel the indeterminate. Nevertheless, in the finer details of computer science exists these queer artefacts; within its communities, its proliferation of software and its ideologies. We examine recent scholarship that has undertaken what it means to queer computer science. From the performativity of Linux, to the algorithms of Facebook's advertisements, to the logics of MySQL we might see and understand computers are might a bit queerer than we conceive.

Peculiarities of Registration of Fungi Spores in the Air with the Help of Aerosol Particles Counters

The applicability of laser aerosol particle counters for the registration of microscopic fungal spores in the airborne state (including in the presence of background concentrations of atmospheric airborne particles) was demonstrated during the experiments, and a technique was developed to transfer large (from one to several tens of microns in diameter) fungal spores to the air-suspended state, and to register them confidently with a resolution ensuring their identification. Despite the relatively large size of spores, their detection by the aerosol particle counter is possible for a period of time sufficient to track the movement of spores over significant (compared to conventional dust particles) distances. At the same time, according to the results of measurements, it is possible to judge not only the presence of spores in the air, their size, quantity and ways of movement, but also to draw some preliminary conclusions about their properties, in particular, about the tendency to glue and form aggregates. fungal spores, aerosol, particle size distribution, aerosol particle counter.

THE PROCESS OF SEDIMENTATION OF SOLID PARTICLES OF THE GRINDING SLUDGE

Thousands of tons of grinding slimes are formed every month at the mechanical engineering enterprises (especially at bearing plants) and metallurgy ones, which are processing metals. Slimes are practically not processed at present, but exported to special landfills or dumps, worsening the environment. Slimes of abrasive metal processing can be a raw material base for powder metallurgy, as they contain 60-80% of metal particles. It is necessary to carry out the solid particles separation by density process at the slimes washing stage to increase the homogeneity of metal powder, which is extracted from grinding slimes of abrasive metal processing. The fluid flow consumption through the vertical nozzles, which allow keeping solid particles in a suspended state, is determined in this work on the basis of theoretical studies of the solid particles deposition process of grinding slimes.

Suspended States in the Long Caribbean, 1791–1861

This chapter examines the suspended state between colonial slavery and postcolonial independence in the “long Caribbean.” Involving the Caribbean, especially Haiti, and other equivalent experiments in black self-rule in Sierra Leone and Liberia, this incomplete transition from slavery to freedom challenged progressivist accounts of a world tending ever closer to emancipation. Instead, it seemed that history had come to an unexpected halt. As such, many individuals conceived of the citizen and sovereign in static terms and grappled with a form of paused political time in which history appeared to have stopped. The “black counterfactual,” which includes “Benito Cereno,” “The Heroic Slave,” Blake; or, The Huts of America, Liberia, and the first Haitian novel, Stella, emerged from this world. This genre, which considered the perils and possibilities of black self-rule and freedom, attempted to imagine the black state into existence. It aimed to intervene in the past to create a cause-and-effect chain of events that would inevitably lead to a better world. However, these fictions found narrative to be every bit as recalcitrant as the long Caribbean world itself. Overall, this chapter challenges a redemptionist note of black historiography, in which eventual liberation orients racial struggles in the nineteenth century.