Готові списки джерел за темами / Slab melt

Добірка наукової літератури з теми "Slab melt"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Slab melt"

1

Wei, Bowen, Tao Jiang, Shiju Li, Youyun Zhang, Guangming Xu, Yong Li, and Zhaodong Wang. "Improving element uniformity and mechanical properties of Al–Mg–Si alloy fabricated by twin roll casting with superheat melt treatment." Materials Research Express 9, no. 1 (January 1, 2022): 016516. http://dx.doi.org/10.1088/2053-1591/ac4a2c.

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Abstract The effect of superheat melt treatment(SMT) on microstructure and properties of Al–Mg–Si alloy fabricated by twin roll casting(TRC) was analyzed using optical microscope, scanning electron microscopy, emission electron probe micro analyzer and transmission electron microscopy. SMT increased the subcooling degree of melt during TRC. The solidification microstructure with high dendrite density and small dendrite spacing was obtained. The second phase was evenly distributed between dendrites and the solute concentration gradient was decreased. Intergranular solute aggregation caused by Reynolds’ dilatancy in TRC slab was effectively suppressed. The homogeneous solute distribution of TRC slab with SMT can be realized by short-time homogenization heat treatment. The size of insoluble particles was greatly reduced. The complete decomposition of non-equilibrium eutectic phase increased the solute concentration in α-Al, which promoted the precipitation of precipitates during aging heat treatment. The tensile strength and yield strength of T6 slab were improved, while the uniform elongation are almost not decreased. The strength and uniform of slab in T4P state were both improved. The obtained results can help further shorten the production cycle of TRC slabs and improve mechanical properties.
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2

Nishitsuji, Yohei, Elmer Ruigrok, Martín Gomez, Kees Wapenaar, and Deyan Draganov. "Reflection imaging of aseismic zones of the Nazca slab by global-phase seismic interferometry." Interpretation 4, no. 3 (August 1, 2016): SJ1—SJ16. http://dx.doi.org/10.1190/int-2015-0225.1.

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Obtaining detailed images of aseismic parts of subducting slabs remains a large challenge for understanding slab dynamics. Hypocenter mapping cannot be used for the purpose due to the absence of seismicity, whereas the use of receiver functions might be compromised by the presence of melt. Global tomography can be used to identify the presence of the slab, but it does not reveal the structure in detail. We have determined how detailed images can be obtained using global-phase seismic interferometry. The method provides high-resolution ([Formula: see text] in depth) pseudo zero-offset (i.e., colocated source and receiver) reflection information. We have applied the method to aseismic zones of the Nazca slab in which initiation of possible slab tearing and plume decapitation was identified by global tomography and electrical conductivity, respectively. We have obtained an image of the Moho and the mantle and found an attenuated area in the image consistent with the presence of an aseismic dipping subducting slab. However, our interpretation was not unambiguous. The results confirmed that the method is useful for imaging aseismic transects of slabs.
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3

Samoilovich, Yu A. "Melt circulation in thin solidifying steel slab." Steel in Translation 40, no. 3 (March 2010): 256–60. http://dx.doi.org/10.3103/s0967091210030149.

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4

Sakai, Hideki. "How does a slab-shaped solid melt?" Surface Science 348, no. 3 (March 1996): 387–92. http://dx.doi.org/10.1016/0039-6028(96)01033-3.

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5

Liu, Jiachao, Jie Li, Rostislav Hrubiak, and Jesse S. Smith. "Origins of ultralow velocity zones through slab-derived metallic melt." Proceedings of the National Academy of Sciences 113, no. 20 (May 3, 2016): 5547–51. http://dx.doi.org/10.1073/pnas.1519540113.

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Understanding the ultralow velocity zones (ULVZs) places constraints on the chemical composition and thermal structure of deep Earth and provides critical information on the dynamics of large-scale mantle convection, but their origin has remained enigmatic for decades. Recent studies suggest that metallic iron and carbon are produced in subducted slabs when they sink beyond a depth of 250 km. Here we show that the eutectic melting curve of the iron−carbon system crosses the current geotherm near Earth’s core−mantle boundary, suggesting that dense metallic melt may form in the lowermost mantle. If concentrated into isolated patches, such melt could produce the seismically observed density and velocity features of ULVZs. Depending on the wetting behavior of the metallic melt, the resultant ULVZs may be short-lived domains that are replenished or regenerated through subduction, or long-lasting regions containing both metallic and silicate melts. Slab-derived metallic melt may produce another type of ULVZ that escapes core sequestration by reacting with the mantle to form iron-rich postbridgmanite or ferropericlase. The hypotheses connect peculiar features near Earth's core−mantle boundary to subduction of the oceanic lithosphere through the deep carbon cycle.
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Samoilovich, Yu A. "Melt circulation in a thin solidifying steel slab." Steel in Translation 40, no. 1 (January 2010): 4–8. http://dx.doi.org/10.3103/s096709121001002x.

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7

Zhao, Zhi Hao, Jian Zhong Cui, Qing Feng Zhu, and Gao Song Wang. "Experimental and Numerical Study of the Influence of a Low-Frequency Electromagnetic Field on the As-Cast Structure of Horizontal Direct Chill Casting Aluminum Alloy Slab." Advanced Materials Research 79-82 (August 2009): 1265–68. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1265.

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The influences of low frequency electromagnetic field on the as-cast structure of horizontal direct chill casting aluminum alloy slab were experimental and numerical studied. The results of numerical analysis show that the interaction of the low-frequency electromagnetic field and the melt can generate an electromagnetically induced forced flow in the melt, which, in turn, changes flow pattern and temperature field in the mold. the as-cast structure of slab can be greatly improved by the changes of flow pattern and temperature field. The results of experimental analysis show that the grains of low frequency electromagnetic casting (LFEC) are fine, uniform, equiaxed, rosette-shaped; the surface of the slab of LFEC has no cold shut and less exudations. Moreover, the low-frequency electromagnetic field can improve the distribution of solute elements in the slab. The macrosegregation such as negative segregation and gravity segregation were reduced, which results in the homogenous distributions of the solute elements over the cross-section of the slab.
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8

Drummond, M. S., M. J. Defant, and P. K. Kepezhinskas. "Petrogenesis of slab-derived trondhjemite–tonalite–dacite/adakite magmas." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 87, no. 1-2 (1996): 205–15. http://dx.doi.org/10.1017/s0263593300006611.

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ABSTRACT:The prospect of partial melting of the subducted oceanic crust to produce arc magmatism has been debated for over 30 years. Debate has centred on the physical conditions of slab melting and the lack of a definitive, unambiguous geochemical signature and petrogenetic process. Experimental partial melting data for basalt over a wide range of pressures (1–32 kbar) and temperatures (700–1150°C) have shown that melt compositions are primarily trondhjemite–tonalite–dacite (TTD). High-Al (> 15% Al2O3 at the 70% SiO2 level) TTD melts are produced by high-pressure (≥ 5 kbar) partial melting of basalt, leaving a restite assemblage of garnet + clinopyroxene ± hornblende. A specific Cenozoic high-Al TTD (adakite) contains lower Y, Yb and Sc and higher Sr, Sr/Y, La/Yb and.Zr/Sm relative to other TTD types and is interpreted to represent a slab melt under garnet amphibolite to eclogite conditions. High-Al TTD with an adakite-like geochemical character is prevalent in the Archean as the result of a higher geotherm that facilitated slab melting. Cenozoic adakite localities are commonly associated with the subduction of young (<25 Ma), hot oceanic crust, which may provide a slab geotherm (≍9–10°C km−1) conducive for slab dehydration melting. Viable alternative or supporting tectonic effects that may enhance slab melting include highly oblique convergence and resultant high shear stresses and incipient subduction into a pristine hot mantle wedge. The minimum P–T conditions for slab melting are interpreted to be 22–26 kbar (75–85 km depth) and 750–800°C. This P–T regime is framed by the hornblende dehydration, 10°C/km, and wet basalt melting curves and coincides with numerous potential slab dehydration reactions, such as tremolite, biotite + quartz, serpentine, talc, Mg-chloritoid, paragonite, clinohumite and talc + phengite. Involvement of overthickened (>50 km) lower continental crust either via direct partial melting or as a contaminant in typical mantle wedge-derived arc magmas has been presented as an alternative to slab melting. However, the intermediate to felsic volcanic and plutonic rocks that involve the lower crust are more highly potassic, enriched in large ion lithophile elements and elevated in Sr isotopic values relative to Cenozoic adakites. Slab-derived adakites, on the other hand, ascend into and react with the mantle wedge and become progressively enriched in MgO, Cr and Ni while retaining their slab melt geochemical signature. Our studies in northern Kamchatka, Russia provide an excellent case example for adakite-mantle interaction and a rare glimpse of trapped slab melt veinlets in Na-metasomatised mantle xenoliths.
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9

Xu, Lin, Qun-Wu Pei, Ze-Feng Han, Shuo Yang, Jian-Yu Wang, and Yan-Tao Yao. "Modeling Study on Melt Flow, Heat Transfer, and Inclusion Motion in the Funnel-shaped Molds for Two Thin-Slab Casters." Processes 10, no. 12 (December 19, 2022): 2738. http://dx.doi.org/10.3390/pr10122738.

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For the purpose of studying compact strip production (CSP) funnel-shaped mold and flexible thin-slab rolling (FTSR) funnel-shaped mold, a three-dimensional (3D) multi-field coupling mathematical model was established to describe the electromagnetic braking (EMBr) continuous casting process. To investigate the metallurgical effect of EMBr in the CSP and FTSR funnel-shaped thin-slab molds, a Reynolds-averaged Navier–Stokes (RANS) turbulence model, together with an enthalpy–porosity approach, was established to numerically simulate the effect of ruler EMBr on the behaviors of melt flow, heat transfer, solidification, and inclusion movement in high-speed casting. The simulation results indicate that the application of ruler EMBr in the CSP and FTSR molds shows great potential to improve the surface temperature of molten steel and reduce the penetration depth of downward backflow. This contributes to the melting of the slag rim near the meniscus region and facilitates the floating removal of the inclusions in the molten pool. In addition, in comparison with the case of no EMBr, the parametric study shows that the braking effect of ruler EMBr with an electromagnetic parameter of 0.5 T can enhance the upward backflow in the two high-speed thin-slab molds. The enhanced upward backflow can successfully entrain the inclusions to the top of the mold and improve the activity of surface fluctuations to avoid the formation of the slag rim. For instance, for the ruler EMBr applied to the FTSR mold, the maximum amplitude of surface fluctuation and the floatation removal quantity of inclusions with a diameter of 100 μm are increased by 4.6 percent and 51 percent, respectively.
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10

Dilek, Yildirim, and Limei Tang. "Magmatic record of the Mesozoic geology of Hainan Island and its implications for the Mesozoic tectonomagmatic evolution of SE China: effects of slab geometry and dynamics in continental tectonics." Geological Magazine 158, no. 1 (December 10, 2020): 118–42. http://dx.doi.org/10.1017/s0016756820001211.

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AbstractOur field-based geochemical studies of the Triassic, Jurassic and Cretaceous granitoids on Hainan Island indicate that their magmas had different geochemical affinities, changing from alkaline in the Triassic through ocean island basalt (OIB) in the Jurassic, to calc-alkaline in the Cretaceous. We show that these changes in the geochemical affinities of the Mesozoic granitoids on Hainan and in SE China reflect different melt sources and melt evolution patterns through time. Our new geodynamic model suggests that: (1) Triassic geology was controlled by flat-slab subduction of the palaeo-Pacific plate beneath SE China. This slab dynamics resulted in strong coupling between the lower and upper plates, causing push-over tectonics and contractional deformation in SE China. Flat subduction-induced edge flow and aesthenospheric uprising led to the production of high-K granites, syenites and mafic rocks. (2) Slab foundering, accelerated subduction rates and subduction hinge retreat in the Early Jurassic caused rapid rollback of the downgoing slab. Strong decoupling of the upper and lower plates resulted in pull-away tectonics, producing extensional deformation in SE China. Decompression melting of the upwelling aesthenosphere produced OIB-type melts, which interacted with the subcontinental lithospheric mantle (SCLM) to form A- and I-type granitoids. (3) Segmentation of the palaeo-Pacific plate in the Early Cretaceous resulted in steeply dipping slabs and their faster rollback, facilitating lithospheric-scale extension and oceanward migration of calc-alkaline magmatism. This extensional deformation played a significant role in the formation of metamorphic core complexes, widespread crustal melting and development of a Basin and Range-type tectonics and landscape evolution in SE China.
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Більше джерел

Дисертації з теми "Slab melt"

1

Ekengård, Johan. "Slag/Metal Metallurgy in Iron and Steel Melts." Doctoral thesis, KTH, Tillämpad processmetallurgi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187228.

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In this work, the metal and slag phase mixing in three steps of a ladle refining operation of steel melts and for an oxygen balance during cooling of cast iron melts have been studied at two Swedish steel plants and at two Swedish cast iron foundries, respectively. In order to predict the oxygen activity in the steel bulk in equilibrium with the top slag as well as in metal droplets in the top slag in equilibrium with the top slag, three slag models were used. In addition, the assumptions of a sulphur-oxygen equilibrium between steel and slag and the dilute solution model for the liquid steel phase were utilized in the calculations. Measured oxygen activities in steel bulk, which varied between 3.5-6 ppm, were compared to predicted oxygen activities. The differences between the predicted and measured oxygen activities were found to be significant (0-500%) and the reasons for the differences are discussed in the thesis. Slag samples have been evaluated to determine the distribution of the metal droplets. The results show that the relatively largest numbers of metal droplets are present in the slag samples taken before vacuum degassing. Also, the projected interfacial area between steel bulk and top slag has been compared to the interfacial area between the metal droplets and slag. The results show that the droplet-slag interfacial area is 3 to 14 times larger than the flat projected interfacial area between the steel and top slag. Furthermore, the effect of the reactions between top slag and steel and the slag viscosity on the metal droplet formation is discussed. The results show significant differences between the steel bulk and steel droplet compositions and the reasons for the differences are discussed in the thesis. The oxygen activity in different cast irons was studied. Plant trials were performed at three occasions for lamellar, compacted and nodular iron melts. The results show that at temperatures close to the liquidus temperature the oxygen activities were 0.03-0.1 ppm for LGI, around 0.02 ppm for CGI, and 0.001ppm for SGI. In addition, it was found that as the oxygen activities increased with time after an Mg treatment, the ability to form a compact graphite or a nodular graphite in Mg-treated iron melts was decreased. Also, extrapolated oxygen activity differences up to 0.07 ppm were found for different hypoeutectic iron compositions for lamellar graphite iron at the liquidus temperature. Overall, the observed differences in the dissolved oxygen levels were believed to influence how graphite particles are incorporated into the austenite matrix and how the graphite morphology will be in the cast product.

QC 20160518

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2

Jonker-Brash, Robina Ann. "Erosion of refractories : mechanisms for dissolution of graphite by iron-carbon melts." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297215.

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3

Rahman, Muhammad Mahfuzur Materials Science &amp Engineering Faculty of Science UNSW. "Fundamental investigation of slag/carbon interactions in electric arc furnace steelmaking process." Awarded By:University of New South Wales. Materials Science & Engineering, 2010. http://handle.unsw.edu.au/1959.4/44798.

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This work investigates the interactions of carbonaceous materials (metallurgical coke, natural graphite and HDPE/coke blends) with three EAF slags [FeO: 24% to 32%]. Experiments were conducted using the sessile drop technique (1500??C-1600??C) with off-gases (CO, CO2) measured using an IR analyzer; the wetting behaviour was determined from contact angle measurements. Estimation of slag foaming behaviour was determined from the droplet volume changes calculated using specialized software. At 1550??C, all slags were non-wetting with coke due to increased surface tension due to sulphur. At 1550??C, slag 1 was initially non-wetting on natural graphite due to gas entrapment in the slag droplet; the wetting improved after that. Other slags showed comparatively better wetting. At 1600??C, all slags were non-wetting with coke. Slags showed a shift from non-wetting to wetting behaviour with natural graphite. Slag/coke reactions produced high off-gases levels causing extensive FeO reduction; gas entrapment in the slag was poor (small volume droplets). Slag/natural graphite interactions revealed both slow gas generation rates and FeO reduction, and excellent gas entrapment (higher droplet volumes) with minor changes in slag properties due to low ash levels. The iron oxide reduction rates were determined to be 1.54x10-5 and 4.2x10-6 mol.cm-2/sec (Slag 1, 1550??C) for metallurgical coke and natural graphite respectively. Slag interactions with coke/HDPE blends showed increasing off-gas levels with increasing HDPE levels. Blend#3 produced the highest off-gas levels, extensive FeO reduction and displayed significantly higher slag foaming and better wetting compared to coke. Our line on trends compared well for slag/carbon interactions and resulted in deceased specific energy consumption and carbon usage and increased productivity. These findings have enhanced the possibility of utilizing polymeric wastes in blends with coke in EAF steelmaking for slag/carbon interactions.
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4

Meyer, Julia, and Ashraf Ayash. "Meet new friends – oder wie Fremde zu Freunden werden." SLUB Dresden, 2016. https://slub.qucosa.de/id/qucosa%3A7793.

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„Integration beginnt mit Sprache. Neben dem Spracherwerb ist auch die soziale Praxis unerlässlich, wenn wir Flüchtlinge integrieren wollen. Dies kann nur im Miteinander und im Austausch gelingen und erfordert unseren persönlichen, solidarischen Einsatz. Bibliotheken als öffentlicher kultureller Raum laden zur Begegnung ein.
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5

Murphy, David Thomas. "The effect of deeply subducted oceanic slabs and associated sediment on the chemical evolution of the mantle and on mantle-derived melts /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17244.pdf.

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6

Pirard, Cassian. "Transfer of melts in the sub-arc mantle: Insights from high-pressure experiments and from the New Caledonia ophiolite." Phd thesis, 2010. http://hdl.handle.net/1885/9142.

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High-pressure experiments were aimed to study the interaction between slab melts and the sub-arc mantle at depth of ~100km in a range of P-T condition which are representative of the mantle wedge above subducted slab. Experiments have shown that porous reactive flow induces the formation of micas and amphibole in the pressure range of 25 to 45 kbar for 800 to 1000 degrees. This leads to a strong depletion in LILE and LREE in the residual fluid. The wet solidus obtained in our experiments is 975 degrees at 35 kbar. The composition and the melting conditions of metasomatised peridotite highlight the importance of hydrous phases in the sub-arc mantle. Experimental reproduction of focused flow in the mantle wedge show that orthopyroxenite walls form an interface between slab melt and olivine. The trace element composition of the slab melt is only slightly modified in this transfer process. Therefore, the transfer of slab melt by focused flow to the locus of partial melting in the mantle wedge provides a much more efficient way to conserve the slab signature than porous flow. The New Caledonia ultramafic ophiolite provides further insights on the interactions which can exist between melts and the upper mantle. Here we provide the first recent petrological overview of the Massif du Sud ophiolite on the basis of petrological and geochemical data. This thesis show that this highly depleted ophiolite of 3000m thick mantle section is related to an arc environment associated with a spreading ridge origin. A suite of discordant rocks (dunite, pyroxenite, gabbro) presents in New Caledonia show the evolution of H2O-SiO2 rich melts transferred by focused flow. These melts are feeding the arc crust through a network of channels and dykes. Melt evolution at sub-Moho levels provide critical information in solving the arc paradox as large amount of pyroxenite rocks can be accumulated in the mantle prior to their incorporation in the crust. A late generation of pyroxenite and amphibole dykes has been connected to the emplacement of large felsic intrusions at the crust-mantle boundary. U-Pb dating on separated zircons from these intrusions and associated dykes provides Eocene ages confirming that these rocks are a pre-obductive feature of the Massif du Sud. These rocks represent a late fore-arc igneous activity and provide new information on melt-mantle interaction and the composition of melts in a colder part of the mantle wedge. The relative timing of events recorded in the New Caledonia ophiolite also imposes new constraints on the geodynamics of the South West Pacific from the middle Cretaceous to recent times.
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7

Liu, Chen-Chung, and 劉承宗. "Reinforced concrete slab structural reinforce-ment of discussion." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/87197631305600275813.

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Анотація:
碩士
中華大學
營建管理學系
104
Geologically, Taiwan is located in an island-type climate area where the summer is hot and humid and it is regularly hit by typhoons and earthquakes. During the winter, Taiwan is subjected to strong northeast bound monsoon winds. As Taiwan is surrounded by the sea, the air usually carries salty chloride ion, moisture, oxygen and chloride ion that it tends to cause erosion through structural cracks. This results in the oxidizing corrosion of steel as well as the cracking and peeling of concrete structure. In the early days, the steel bars in RC structure were vulnerable to structural bursting damage. Usually, the cement paste or mortar was used for repairs. Recently, epoxy mortar, or light-mass hollow mortar, has been developed and used in the patch-up applications and it will achieve certain degree of structure repairing effect initially. However, the rusty por-tion deep of the steel bars deep inside the structure cannot be effectively removed and it tends to cause continuous oxidization in the steel bars. As a result, the RC structure will become oxidized from the deeper layer of steel bars and once again lead to volumetric swelling, cracking, and peeling. Furthermore, the repairing layer or the patch-up on the surface will peel off, thus losing the original repairing function and purpose. To prevent the reoccurrence of oxidization or the stress-concentrating phenomenon on the patch-up surface as to cause ineffective repairing result, in addition to thoroughly re-move the rust from the oxidized steel surface, the subbase should be coated with high-penetrating epoxy in order that the poor-quality concrete and oxidized rusty steel bars should be fully soaked to produce the binding layer and repairing link in tiny cracks. In the meantime, the CFRP patch-up material will be used for the beams and slabs. Furthermore, the stressed reinforcing material should be used for both ends, with splicing and overlap-ping method applied at the beams and slab. The corner should be secured at small spacing with L-shape steel and chemical anchoring bolts. The gap between L-shape steel and slab/beams should be filled with epoxy mortar. The shorter side of the slab should be rein-forced with mini H-shape steel (125*125) for every meter. The CFRP should be anchored and reinforced for jointing with L-shape and mini H-shape steels. By coordinating with 8% of volumetric swelling properties from chemical reaction for the epoxy patch-up material, a tight and perfect clamping force will be developed for CFRP and steel members. According to the construction method of this research, the result indicated that it can change the conventional patching method where the steel oxidization phenomenon reoccurs several years after. Such method has been implemented in the community complex and in-dividual house projects in high-humidity area such as Linkou, Tamsui, and Neihu areas as well as the mountainous location in Xindian area and these buildings still maintain their original status after being erected for 7 to 8 years until now. Currently, the visual and tap-bouncing methods are executed for the monitoring and there is not any internal swell-ing or peeling sign. Besides, it also saves the construction cost and minimizes the subse-quent maintenance problem. With correct patch-up method, it can really extend the lifespan of the structure.
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8

Dosanjh, Pinder S. "Microwave surface resistance measurements of YBa2Cu3o6+x single crystals and melt textured slabs employing a niobium double split-ring resonator." Thesis, 2001. http://hdl.handle.net/2429/11518.

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The microwave surface impedance of YBa2Cu3O6+x was measured using a new niobium split-ring resonator. For the first time it is shown that this resonator geometry allows one to measure both small single crystals and large area slabs employing the same resonator assembly. By careful polishing of the niobium surfaces the niobium split-ring resonator has achieved a resolution of 0.2µΩ at 2.079GHz, about a factor of 5 better than its predessesor. Results are presented on both the a and b axis at 2.079GHz and 2.942GHz for a high quality YBa2Cu3O6.5 OrthoII single crystal as well as results on two YBa2Cu3O6+x top seeded melt textured slabs. The single crystal results show significant frequency dependence over the narrow range studied, an indication that the width of the Drude peak is less than what has been observed in optimally doped YBa2Cu3O6+x. The scattering rates for both the a and b axis are not well described by a single rate; this is suggestive of two processes contributing to the scattering. As well, the scattering rate in the b direction seems to be impurity limited. Measurements on the two melt textured slabs show that changing the Y2Ba1Cu1O5 concentration from 15-3% has little effect on the surface resistance in the superconducting state. At 77K, the surface resistance for the best slab is only a factor of 1.3 higher than that reported for the best Tl2Ba2Ca1Cu2OΔ thin films. [Scientific formulae used in this abstract could not be reproduced.]
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9

Jooste, Cecilia Petronella. "Machadodorp tot en met dorpstigting in 1904 (Afrikaans)." Diss., 2008. http://hdl.handle.net/2263/29462.

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Die verhandeling begin met 'n beknopte oorsig oor die plek en aard van plaaslike geskiedenis in Westerse en Suid-Afrikaanse historiografie. Machadodorp se geografiese ligging, sowel as fisiese faktore soos geografie en klimaat was bepalend tydens die vroeë vestigingsgeskiedenis. Uit argeologiese navorsing wat in die groter streek gedoen is, is vasgestel dat Steentydperkmense, Ystertydperkmense en swart gemeenskappe soos die Koni, Pedi en Swazi van die vroegste inwoners van die gebied was. Gedurende die laaste helfte van die negentiende eeu het die eerste wit setlaars die gebied binnegekom. Die bou van die hoofspoorlyn, die Oosterlijn, na die Portugese hawe Delagoabaai was belangrik vir die behoud van die politieke en ekonomiese onafhanklikheid van die ZAR. Die geskiedenis van die opmeet, bou en ontwikkeling van hierdie spoorlyn en die ontstaansgeskiedenis van Machadodorp is nou verweef. Aanvanklik was albei nedersettings, Machadodorp en Carolina, deel van die Lydenburglanddrosdistrik. Toe Carolina in 1893 tot onafhanklike landdrosdistrik geproklameer is, moes die ZAR-regering uitsluitsel gee tot watter distrik Machadodorp sou hoort. Die uiteindelike besluit dat dit deel van die Lydenburg-landdrosdistrik moes bly, sou vir Machadodorp en omgewing langdurende administratiewe gevolge inhou. Die Anglo-Boereoorlog was die mees ingrypende gebeurtenis in Machadodorp se geskiedenis voor 1904. Nadat Pretoria, die hoofstad van die ZAR, deur die Britse magte beset is, het Machadodorp die tydelike regeringsetel van die ZAR geword (5 Junie 1900 tot 27 Augustus 1900). Die Britse troepe het Machadodorp op 28 Augustus 1900 beset en op 1 September 1900 het lord Roberts, die opperbevelhebber van die Britse troepe in suider-Afrika, die Transvaal as deel van die Britse ryk geproklameer. Britse troepe was op die dorp tot na die vredesluiting in 1902. Die verhandeling word afgesluit met 'n bespreking van die administratiewe proses waarvolgens Machadodorp tot dorp geproklameer is. Hierdie proses, wat deur die uitbreek van die oorlog onderbreek is, is tydens die koloniale tydperk voltooi. Op 30 Desember 1904 is Machadodorp tot dorp geproklameer en het die eerste fase in die dorp se ontwikkelingsgeskiedenis tot 'n einde gekom. ENGLISH : The dissertation begins with a brief review of the nature and status of local history in Western and South African historiography. The geographic location of Machadodorp as well as physical factors, such as geology and climate, determined early settlement patterns. From archaeological research in the area it was determined that the earliest inhabitants of the greater Machadodorp area were Stone Age people, Iron Age people and black communities, such as the Koni, Pedi and Swazi. During the last half of the nineteenth century the first whites settled in the region of Machadodorp. To retain their political and economic independence the ZAR had to obtain a non- British route to the outside world. This idea could only be realized if a railway line, the Oosterlijn, was built to the Portuguese harbour of Delgoa Bay. There is a very close link between the surveying, planning, building and development of this railway line and the history of the establishment of Machadodorp. Initially, the two settlements, Machadodorp and Carolina were part of the Lydenburg magisterial district. When Carolina was proclaimed an independent magisterial district in 1893, the ZAR government had to make a decision regarding the district to which Machadodorp would belong. The eventual decision that Machadodorp should remain part of the Lydenburg magisterial district resulted in long term administrative consequences for the Machadodorp area. The Anglo Boer War was the most influential event in the history of Machadodorp prior to 1904. After Pretoria, the capital of the ZAR was occupied by the British forces Machadodorp became the temporary seat of the ZAR government (5 June 1900 – 27 August 1900). On 28 August 1900 the town was occupied by the British troops and on 1 September 1900 Lord Roberts, Commander-in-chief of the British troops in Southern Africa, proclaimed the Transvaal as part of the British Empire. The British troops remained in Machadodorp until after the peace negotiations in 1902. The dissertation concludes with a discussion of the process by which Machadodorp was proclaimed a town. This process which started before the outbreak of the war was disrupted by the war and was only completed after the war. On 30 December 1904 Machadodorp was proclaimed a town, whereby the first phase in Machadodorp’s developmental history was concluded.
Dissertation (MA)--University of Pretoria, 2011.
Historical and Heritage Studies
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Lindvall, Mikael. "A Study on Vanadium Extraction from Fe-V-P Melts Derived from Primary and Secondary Sources." Doctoral thesis, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-213747.

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Vanadium extraction methods were developed for iron-vanadium-phosphorus (Fe-V-P) melts derived from processing of V-bearing titanomagnetites and steel slags. Studies on phase relationships of V slags were carried out to provide important understanding of the extraction processes. Phase relationship in vanadiferous slag was investigated experimentally at 1573K, 1673K and 1773K, for the compositional range of 0-6mass% Al2O3, 1-5mass% CaO, 10-17mass% SiO2, with MnO and V2O3 fixed at 5.5mass% and 30mass%, balanced with FeO. The slags were found to be solid-liquid mixtures, of liquid, spinel and in some cases free silica. Alumina was identified as the preferred additive to prohibit precipitation of free silica. A method for V extraction to vanadiferous slag was developed based on Fe-V(2mass%)-P(0.1mass%) melts at 1677K using a semi-industrial scale BOF. Oxidation was carried out with an oxygen enriched air jet and iron ore pellets. The complete dissolution of pellets was achieved by deliberately creating good stirring conditions utilising high momentary decarburisation rates. The P distribution to the slag was low when good stirring conditions was obtained. Phase relationship in Al2O3-CaO(25-35mass%)-SiO2-VOx slag was investigated experimentally at an oxygen partial pressure of 9.37•10-11atm and 1873K. The maximum solubility of V-oxide in the slag was 9-10mass% V2O3. Two solid phases were found, a solid solution of Al2O3 in V2O3 (karelianite) and hibonite with fractionation of V into the crystal structure. V extraction experiments to Al2O3-CaO-SiO2 based slags were carried out in 150kg scale by blowing CO2 gas into the metal bath consisting mainly of 1-10mass% V and 1mass% P. At these conditions, oxidation of V was favoured over Fe. Up to 10-13mass% V2O3 could be dissolved in the slag before a viscous slag saturated in V-oxide was observed. The phosphate capacity in the slag was low and as a result this slag could at once be subjected to a final reduction step for production of ferrovanadium with 40-50mass% V.
Metoder för att utvinna vanadin till högvärdiga vanadinslagger från metallsmältor innehållande främst järn (Fe), vanadin (V) och fosfor (P) utvecklades. Metallsmältorna framställs genom att processa primära V råvaror, såsom titanomagnetit, och sekundära råvaror av i huvudsak vanadinrik stålslagg. Fasstudier av högvärdiga vanadinslagger genomfördes som grund för utvecklingsarbetet. Experimentella fasstudier av vanadinspinellslagg med 30vikt% V2O3 och 5.5vikt% MnO genomfördes vid en temperatur av 1573K, 1673K och 1773K. Övriga komponenter i slaggen varierades inom ett intervall av 0-6vikt% Al2O3, 1-5vikt% CaO och 10-17vikt% SiO2, viktad med järnoxid. Samtliga slagger var sammansatt av både flytande- och fastfas. Den fasta fasen utgjordes främst av en vanadin- och järnrik spinellfas och i vissa fall även av fri SiO2. Genom försök i en stålkonverter i semi-industriell skala utvecklades och validerades en metod för vanadinutvinning från råjärnsmältor innehållande 2vikt% V och 0.1vikt% P, vid en temperatur av 1677K. Oxidationen utfördes med syreanrikad luft via en vattenkyld topplans och genom tillsats av hematit pellets. Omsättningen av pellets säkerhetsställdes genom god omrörning som erhölls under korta perioder med höga gasvolymer som en effekt av hög avkolningstakt. Råjärnet efter behandlingen innehöll cirka 3vikt% C och 0.1vikt% V. Producerad vanadinspinellslagg bestod av upp till 30vikt% V2O3. Fosforfördelningen till slaggen var låg under processbetingelser med god omrörning. Experimentella fasstudier av Al2O3-CaO(25-35vikt%)-SiO2-VOx slagg genomfördes vid en temperatur av 1873K och ett syrepartialtryck av 9.37·10-10atm. Den maximala lösligheten av vanadinoxid i slaggen var 9-10vikt% V2O3. Två fasta faser identifierades, V2O3 (Karelianit) med fast löslighet av Al2O3 och Hibonit med vanadinoxid inlöst i kristallstrukturen. Experimentella försök för att utvinna vanadin från en stålsmälta bestående av 1-10vikt% V och 1vikt% P till en slagg med en initial sammansättning av 7-40vikt% Al2O3, 25-35vikt% CaO och 27-64vikt% SiO2 utfördes i en skala av 150kg. Oxidation av vanadin åstadkoms genom att blåsa in CO2 gas i stålsmältan via en spolsten. Under dessa processförhållanden var oxidationen av vanadin gynnsam framför järn och fosfor. Lösligheten av vanadinoxid i slaggen var upp till 10-13vikt% V2O3. Slagg mättad med vanadinoxid var viskös som en konsekvens av utfällning av V2O3 med inlöst Al2O3. Slaggens gynnsamma vanadin och järn- samt vanadin och fosfor förhållande möjliggör att genom slutreduktion producera ferrovanadin med en vanadinhalt av 40-50vikt% och låg fosforhalt.

QC 20170912

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Книги з теми "Slab melt"

1

Meet Blake Griffin: Basketball's slam dunk king. New York: PowerKids Press, 2014.

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2

MacRae, Sloan. Meet Manny Ramirez: Baseball's grand slam hitter. New York: PowerKids Press, 2009.

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3

F, Matthys Eric, Truckner William G, TMS Solidification Committee., TMS Synthesis and Analysis in Materials Processing Committee., and Minerals, Metals and Materials Society. Meeting, eds. Melt spinning, strip casting, and slab casting: Proceedings of a symposium sponsored by the Materials Design and Manufacturing Division (MDMD), Solidification Committee and the the [sic] joint Extraction and Processing Division (EPD) and MDMD Synthesis Control & Analysis in Materials Processing (SCAMP) Committee of the Materials, Metals & Materials Society (TMS) held during the TMS Annual Meeting in Anaheim, California, February 4-8, 1996. Warrendale, Pa: The Society, 1996.

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4

Metals and Materials Society. Meeting (125th : 1996 : Anaheim, Calif.) Minerals. Melt Spinning, Strip Casting and Slab Casting: Proceedings of a Symposium Sponsored by the Materials Design and Manufacturing Division (Mdmd), Solidification Committee and the the Sic Joint. Minerals, Metals, & Materials Society, 1998.

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5

MacRae, Sloan. Meet Manny Ramirez: Baseball's Grand Slam Hitter. Rosen Publishing Group, 2009.

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6

MacRae, Sloan. Meet Manny Ramirez: Baseball's Grand Slam Hitter. Rosen Publishing Group, 2009.

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7

Slab: On that hallelujah day when tiger & preacher meet : a novel. 2015.

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8

Faas, Maarten. Hoe word ik een goede hardlooptrainer? Didactiek van effectieve duurlooptraining. Uitgeverij SWP, 2021. http://dx.doi.org/10.36254/978-94-6154-028-7.

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nodig om deze sporters en groepen te begeleiden. Een looptrainer moet verstand hebben van trainingsleer en looptechniek. Maar het belangrijkste is dat een trainer een hele goede (op)leider en leraar is. Een training geven is lesgeven. Een trainer wil een hardloper of een loopgroep ‘iets’ leren. Hoe doe je dat? In het onderwijs noemen we dat didactiek. Didactiek is de wetenschap die zich bezighoudt met de vraag hoe je het beste les kunt geven. Dit boekje geeft didactische richtlijnen hoe je een goede looptraining geeft. Veel trainers en trainers in opleiding kunnen zich verbeteren op vaardigheden van les- en instructiegeven, goed organiseren en positief begeleiden. Aan de slag!
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9

Schabas, William A. Aborted Kidnap. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198833857.003.0007.

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Led by a former Senator from Tennessee, Luke Lea, a handful of American soldiers take leave over the New Year’s holiday and drive up to the Netherlands with the aim of kidnapping Kaiser Wilhelm II. The Dutch envoy in Brussels gives them a laissez-passer and authorises them to enter his country in uniform. When they get to Amerongen Castle, they brandish the document but fail to convince Count Bentinck’s son to let them meet the Kaiser in person. The Dutch are suspicious, and surround the castle with troops, forcing the Americans to retreat, stealing a monogrammed ashtray on their way out. The US Army holds a disciplinary inquiry, but Lea and his cohorts get little more than a slap on the wrist. They return to civilian life at home and boast of their adventure.
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Notizbücher, MSED. Mein Grillbuch : ♦ deine eigenen Grillrezepte auf einen Blick ♦ Vorausgefülltes Grillprotokoll für deine eigenen Rezepte und Fleisch-Kreationen ♦ ... ♦ Motiv: Slap my meat 6. Independently published, 2019.

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Частини книг з теми "Slab melt"

1

Sakai, Hideaki. "Study on Renewal Method from Deteriorative RC Slab to Precast PC Slab in the Steel Girder Bridge." In High Tech Concrete: Where Technology and Engineering Meet, 2169–76. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_248.

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Kruijswijk, Wilco, and Ilse de Bruijn. "Aan de slag met mantelzorgers." In Mantelzorgers en vrijwilligers in beeld, 117–42. Houten: Bohn Stafleu van Loghum, 2013. http://dx.doi.org/10.1007/978-90-313-9227-8_6.

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Elferink, Jolanda, and Cecil Scholten. "Aan de slag met vrijwilligers." In Mantelzorgers en vrijwilligers in beeld, 143–65. Houten: Bohn Stafleu van Loghum, 2013. http://dx.doi.org/10.1007/978-90-313-9227-8_7.

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4

Bocklenberg, Lennart, Mark A. Ahrens, and Peter Mark. "Punching Analyses of Symmetrically Reduced Concrete Slab Quarters." In High Tech Concrete: Where Technology and Engineering Meet, 832–40. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_97.

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5

Fuchs, Kerstin, Georg Gaßner, and Johann Kollegger. "Steel- Concrete- Composite Bridges with Innovative Prefabricated Slab Elements." In High Tech Concrete: Where Technology and Engineering Meet, 2590–97. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_295.

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6

Song, Yeong Hwan, Hwan Goo Seong, Soo Han Park, Duck Kyu Ahn, Chang Hwan Seo, and Bo Young Hur. "Fabrication and Characterization of Slag Fiber by Melt Extraction." In Materials Science Forum, 499–502. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-431-6.499.

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7

Verbeek, Ingrid, and Merijn van de Laar. "Aan de slag met automatische gedachten." In Verbeter je slaap, 49–55. Houten: Bohn Stafleu van Loghum, 2010. http://dx.doi.org/10.1007/978-90-313-7522-6_6.

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Verbeek, Ingrid, and Merijn van de Laar. "Aan de slag met automatische gedachten." In Behandeling van langdurige slapeloosheid, 39–41. Houten: Bohn Stafleu van Loghum, 2010. http://dx.doi.org/10.1007/978-90-313-7524-0_6.

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9

Lehmann, Jean, and Michèle Nadif. "15. Interactions Between Metal and Slag Melts: Steel Desulfurization." In Sulfur in Magmas and Melts:, edited by Harald Behrens and James D. Webster, 493–512. Berlin, Boston: De Gruyter, 2011. http://dx.doi.org/10.1515/9781501508370-015.

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10

Einpaul, Jürgen, Robert L. Vollum, and António Pinho Ramos. "On the Distribution of Shear Forces in Non-axisymmetric Slab-Column Connections." In High Tech Concrete: Where Technology and Engineering Meet, 841–48. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_98.

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Тези доповідей конференцій з теми "Slab melt"

1

Brahm, Raimundo, Takeshi Kuritani, Naoya Sakamoto, Hisayoshi Yurimoto, Georg Florian Zellmer, Mitsushiro Nakagawa, and Eiichi Sato. "Slab Temperature Control on Volatile Budgets of Arc Magmas Tracked from Melt Inclusion Halogen Contents." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.253.

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2

Koz, Mustafa, Hamza S. Erden, and H. Ezzat Khalifa. "Numerical Investigation of the Melting of a Phase Change Material in a Thermal Storage Device With Embedded Air Flow Channels." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7412.

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Two time-dependent mathematical and numerical models with different levels of complexity and fidelity were developed to investigate the melting of a phase change material (PCM) configured as a number of aluminum-encased, PCM-filled slabs with embedded micro-channel aluminum tubes, and with parallel air-flow passages interposed between the slabs. Melting was first analyzed with the COMSOL Multiphysics® finite-element model (FEM) in a 2-D domain representing a full-size slab. The melting process is simulated via the apparent heat capacity method. The model captures the effect of natural convection in the PCM melt as well as the conjugate heat transfer through the aluminum tubes. A fast-executing quasi 2-D reduced-order model (ROM) was developed for repetitive design optimization studies. The ROM relies on a time-dependent 1-D closed-form solution of the heat conduction equation in a melting PCM, coupled with variations of the air temperature and heat transfer coefficient. Consequently, the FEM results were employed to develop corrections to the ROM. The corrected ROM was then utilized to study the melting process in a multi-slab thermal storage device that is designed to freeze the PCM at night and release 500 W-h of cooling over a span of ∼10 h during the day.
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3

Roday, Anand P., and Michael J. Kazmierczak. "Phase-Change in Finite Slabs With Time-Dependent Convective Boundary Conditions." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56734.

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The heat balance integral method is used to solve one-dimensional phase-change problem in a finite slab with time-dependent convective boundary condition, [T∞,1(t)], applied at the left face. The temperature, T∞,1(t), decreases linearly with time; the other face of the slab is subjected to a constant convective boundary condition with T∞,2 held fixed at the ambient temperature. Two initial conditions are investigated: temperature of the solid below the melting point (subcooled), and initially at the fusion temperature (Tf). The temperature, T∞,1(t) at time t = 0 is so chosen such that convective heating takes place and the slab begins to melt (i.e., T∞,1(0)> Tf> T∞,2). Thus the solid-liquid interface proceeds forward to the right. As time continues, and T∞,1(t) decreases with time, the phase-change front slows, stops, and may even reverse direction. Hence this problem features sequential melting and freezing of the slab with partial penetration of the solid-liquid front before reversal of the phase-change process. It should, however, be noted that the study is limited to only one solid-liquid interface at any given time during the phase-change process (either melting or freezing) and that slight subcooling of the melt is allowed. The effect of varying the Biot number at the right face of the slab, for both the initial conditions, is also investigated to determine its impact on the growth/recession of the solid-liquid interface. Temperature profiles in both regions (liquid and solid) are reported in detail. The effect of a slower decay rate of T∞,1(t) on the phase-change process is also analyzed for the initial condition of the slab being at the fusion temperature.
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4

Huang, Yong, Qing Gao, Yan Liu, and Y. Y. Yan. "Investigation of Thermal Characteristics on Simultaneous Snow and Melt in Road." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40041.

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An automatically controlled hydronic ice-snow melting (HISM) technology in road coupled with slab solar collection (SSC) and underground thermal energy storage (UTES) has become an increasingly sustainable and important measure in road engineering and heat engineering An experiment on the hydronic snow melting system with coil pipe imbedded in road was implemented to investigate the thermal characteristics of simultaneous snow and melt in road. Research focused on the active sync process of road snow melting in the different pitch pipe, snow melt patterns, surface temperature, unit area heat consumption and unit length temperature difference, etc, and explored factors of impact characteristics, and recognized a synchronous process. The result shows that the smaller pipe pitch of dense arrangement is, the higher snow free area ratio is and the effect of snow removal is better. Actually the short duration of snow melting needs big heat load and heat consumption. The arrangement of small pitch can support big heating intensity. In the simultaneous snow and melt, a short duration of snow melting and timely melting must be fulfilled as quickly as possible and it can significantly shorten the lifetime of snow accumulated on road. But a big heating system will be required and it leads to a large initial investment.
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5

Muth, Michelle, and Paul Wallace. "HOW DOES SLAB-DERIVED SULFUR AFFECT MAGMA REDOX IN THE SOUTHERN CASCADES? INSIGHTS FROM THE MELT INCLUSION RECORD." In 115th Annual GSA Cordilleran Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019cd-329484.

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6

Hasan, Mainul, and Latifa Begum. "A Comparison Between 3-D Thermal Model and 3-D CFD Model for Vertical DC Casting of Rolling Ingots of Aluminum Alloy 7050." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36763.

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In this study, first a 3-D thermal model is developed for an open top, vertical direct chill (DC) casting process of rolling slabs (ingots) by taking into account the casting speed in the form of slag flow in the thermal connective-diffusion equation. The mushy region solidification characteristics of the process are accounted for through the implementation of the enthalpy porosity technique. The thermal model is later extended to a 3-D CFD model to account for the coupled turbulent heat transfer and solidification aspect of the process. Both models simulate an industrial-sized, hot-top type vertical Direct Chill (DC) slab caster for high strength aluminum alloy AA-7050. A staggered control volume based finite-difference scheme is used to solve the modeled equations and the associated boundary conditions. In the CFD model, the turbulent aspects of flow and solidification heat transfer are modeled using a low Reynolds number version of the k–ε eddy viscosity approach. Computed results for the steady-state phase of the casting process are presented for four casting speeds varying from 60 to 180 mm/min for a fixed inlet melt superheat of 32°C. Simulation results of the velocity and temperature fields and heat fluxes along the caster surface are presented for the CFD model and the shell thickness and sump depth are compared between the CFD and thermal models.
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Hasan, Mainul. "Numerical Study of a Direct Chill Slab Caster Fitted With a Porous Filter for Aluminum Alloy AA-2024." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36748.

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The present study is undertaken to model an industrial-sized vertical Direct Chill (DC) slab caster fitted with a porous filter near the melt entry region. The modeled alloy is a high strength aluminum alloy AA-2024 which is extensively used by the aerospace industry. The model has incorporated the 3-D turbulent aspect of the melt flow and heat transfer in the liquid sump and the mushy region solidification aspect of this long solidification range (136° C) alloy. The verified 3-D turbulent CFD in-house code is used to study the effects of various parameters of this casting process in order to gain some fundamental understanding of the melt flow and solidification behavior of the process. The studied caster consists of a popular ‘hot-top’ mold fitted with a porous filter above which molten aluminum alloy is delivered with a constant flow-rate across the entire hot-top. Because of two-fold symmetry, a quarter of the domain of the caster is modeled to save computational costs and time. A staggered control volume based finite-difference scheme is used to solve the non-dimensional modeled equations and the associated boundary conditions. The turbulent aspect of the flow in the porous filter is modeled using the latest suggested version of the Brinkman-Forcheimer extended form of Darcy equation for a porous media. The turbulent melt flow and solidification heat transfer in the clear fluid region are modeled using a low Reynolds number version of the k–ε eddy viscosity model. Computed results for the steady-state phase of the casting process are presented for four casting speeds, varying from 100 to 220 mm/min, for three metal-mold contact regions, varying from 20 to 50 mm and for three metal-mold convective heat transfer boundary conditions, varying from 1.0 to 4.0 kW/m2K and all for a fixed inlet melt superheat of 64° C. The permeability of the filter is also varied to ascertain its influence on the predicted results. Computed results of the velocity and temperature profiles, the sump depth and mushy region at the centre of the caster as well as the solidification shell thickness at the exit of the mold are provided and discussed. The present work can provide some useful guidelines in designing and optimizing a vertical DC slab caster for producing good quality casts for the common aluminum alloy AA-2024.
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Wang, G. X., Chengcai Yao, and B. T. F. Chung. "On Physical Mechanisms of Mushy Zone Formation in Solidification of Pure Semitransparent Materials." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-1039.

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Abstract Two different models, the isothermal mushy zone model and the non-equilibrium planar interface model, are employed to solve the solidification problem of a one-dimensional semitransparent slab subject to radiative and convective cooling at the surface. The mushy zone model is based on the assumption of local equilibrium and predicts the formation of a mushy zone as soon as the temperature of the slab surface reaches the equilibrium melting temperature. The non-equilibrium planar interface model, on the other hand, assumes a stable planar solid/liquid interface during solidification. It allows the existence of melt undercooling at the interface and in the bulk melt. The stability of the planar interface is then examined approximately using the linear stability criterion derived for an opaque material. It is found that a planar interface would be stable even if a large undercooling is generated in the bulk melt in front of the interface. If the rate of external heat transfer is small, however, the planar interface will break down and develop into thermal cells or dendrites. In addition, a transition from a mushy zone to a planar interface is also observed. Based on these results, the thermodynamics and kinetics of crystalline nucleation and growth are examined to illustrate the physical mechanisms of mushy zone formation during solidification of a semi transparent material. It is suggested that the isothermal mushy model and the planar interface model are valid only under corresponding processing conditions, and more research is needed to provide a complete description of the process.
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9

Jensen, Thomas Westergaard, and Linh Cao Hoang. "Numerical Limit Analysis of Slab Bridges with Construction Joints." In IABSE Conference, Copenhagen 2018: Engineering the Past, to Meet the Needs of the Future. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/copenhagen.2018.047.

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The conic yield criteria for reinforced concrete slabs in bending are often used when evaluating the load‐carrying capacity of slab bridges. In the last decades, the yield criteria combined with numerical limit analysis have shown to be efficient methods to determine the load carrying capacity of slabs. However, the yield criteria overestimate the torsion capacity of slabs with high reinforcement ratios and it cannot handle slabs with construction joints. In this paper, numerical limit analysis with the conic yield criteria are compared with yield criteria based on an optimized layer model. The analysis show an increasing overestimation of the load carrying capacity for increasing reinforcement degrees. Furthermore, yield criteria, which combine the conic yield criteria with an extra linear criterion due to friction, are presented for slab bridges with construction joints. The yield criteria for slabs with construction joints are used, in combination with limit analysis, to evaluate a bridge constructed of pre‐cast overturned T‐beams and in‐situ concrete. The analysis show that the load carrying capacity is overestimated, when the construction joints are not considered in the yield criteria.
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10

Arai, Takahiro, Minoru Iwai, and Kosuke Furuichi. "Evaluation of Fatigue Damage in Reinforced Concrete Road Slabs by Acoustic Emission." In IABSE Conference, Copenhagen 2018: Engineering the Past, to Meet the Needs of the Future. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/copenhagen.2018.016.

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Since reinforced concrete (RC) deck slabs are usually damaged by cyclic live load, it is necessary to monitor the deck slab for operation and maintenance purposes. Acoustic emission (AE) is an excellent technique, which can be used for continuous monitoring and detecting fatigue damages of RC structures. First, the AE was applied for evaluating fatigue damage of RC deck slab with truck wheel traveling test in laboratory. The results showed that there was a correlation between the AE energy and damage degree of the slab. Thus, it was able to presume the damage degree by AE energy. In the next step, a test by vehicle with clear mass in a in‐service bridge was performed. The results of the laboratory and in‐service bridge tests imply that the damage degree of RC deck slab are able to evaluate by AE energy.
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Звіти організацій з теми "Slab melt"

1

Piercey, S. J., and J. L. Pilote. Nd-Hf isotope geochemistry and lithogeochemistry of the Rambler Rhyolite, Ming VMS deposit, Baie Verte Peninsula, Newfoundland: evidence for slab melting and implications for VMS localization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328988.

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New high precision lithogeochemistry and Nd and Hf isotopic data were collected on felsic rocks of the Rambler Rhyolite formation from the Ming volcanogenic massive sulphide (VMS) deposit, Baie Verte Peninsula, Newfoundland. The Rambler Rhyolite formation consists of intermediate to felsic volcanic and volcaniclastic rocks with U-shaped primitive mantle normalized trace element patterns with negative Nb anomalies, light rare earth element-enrichment (high La/Sm), and distinctively positive Zr and Hf anomalies relative to surrounding middle rare earth elements (high Zr-Hf/Sm). The Rambler Rhyolite samples have epsilon-Ndt = -2.5 to -1.1 and epsilon-Hft = +3.6 to +6.6; depleted mantle model ages are TDM(Nd) = 1.3-1.5 Ga and TDM(Hf) = 0.9-1.1Ga. The decoupling of the Nd and Hf isotopic data is reflected in epsilon-Hft isotopic data that lies above the mantle array in epsilon-Ndt -epsilon-Hft space with positive ?epsilon-Hft values (+2.3 to +6.2). These Hf-Nd isotopic attributes, and high Zr-Hf/Sm and U-shaped trace element patterns, are consistent with these rocks having formed as slab melts, consistent with previous studies. The association of these slab melt rocks with Au-bearing VMS mineralization, and their FI-FII trace element signatures that are similar to rhyolites in Au-rich VMS deposits in other belts (e.g., Abitibi), suggests that assuming that FI-FII felsic rocks are less prospective is invalid and highlights the importance of having an integrated, full understanding of the tectono-magmatic history of a given belt before assigning whether or not it is prospective for VMS mineralization.
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Zeinstra, Gertrude G., and Saskia Meijboom. Samen aan de slag met groente en fruit op het kinderdagverblijf. Wageningen: Wageningen Food & Biobased Research, 2022. http://dx.doi.org/10.18174/570916.

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Miller, R. L., and G. A. Reimann. Thermodynamics of gas-metal-slag equilibria for applications in in situ and ex situ vitrification melts. Office of Scientific and Technical Information (OSTI), May 1993. http://dx.doi.org/10.2172/10170082.

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4

Guérin, Laurence, Patrick Sins, Lida Klaver, and Juliette Walma van der Molen. Onderzoeksrapport Samen werken aan Bèta Burgerschap. Saxion, 2021. http://dx.doi.org/10.14261/ff0c6282-93e2-41a7-b60ab9bceb2a4328.

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In het TechYourfuture project ‘Samen werken aan Bèta Burgerschap’, dat plaats vond in de periode maart 2015 - maart 2020, gaven de onderzoekers samen met scholen en bedrijven concreet invulling aan burgerschapsonderwijs. De maatschappij en maatschappelijke vraagstukken worden steeds complexer. Politieke, technologische, economische, sociaal-culturele of ecologische aspecten van een vraagstuk zijn met elkaar verweven. Daarnaast spelen ook globale en lokale dimensies een rol. Er zijn alleen hierdoor al meerdere antwoorden mogelijk op een vraagstuk. Gedurende het project hebben basisschoolleerlingen (wereldwijde) maatschappelijk-technologische vraagstukken geanalyseerd, bediscussieerd en daar oplossingen voor bedacht. Leraren hebben in het project geleerd bèta burgerschap activiteiten te ontwikkelen, uit te voeren en te evalueren. In de kern gaat het er in Bèta Burgerschap om dat leerlingen door groepsgewijs vraagstukken op te lossen burgerschapscompetenties ontwikkelen. Het gaat hier om drie hoofdcompetenties: (1.) Collectieve argumentatievaardigheden, (2.) Attituden ten opzichte van maatschappelijk technologische vraagstukken en, (3.) Bèta- en techniekkennis. In het onderzoek ‘Samen werken aan Bèta Burgerschap’ is gekeken naar de ontwikkeling van deze drie hoofdcompetenties bij leerlingen die deelnamen aan Bèta Burgerschap activiteiten, alsook naar de effecten van de training en video-coaching die de leerkrachten in het project gevolgd hebben. De resultaten hiervan zijn in het onderzoeksrapport te lezen. Het onderzoek laat zien dat Bèta Burgerschap een aanpak is die leerlingen mogelijkheden biedt om te oefenen met groepsgewijs probleem oplossen als burgerschapscompetentie. Door op school met maatschappelijk-technologische vraagstukken aan de slag te gaan, doen leerlingen meer kennis op over deze vraagstukken en worden zij zich meer bewust van wat er in de wereld speelt en van hoe zij zich verhouden tot deze vraagstukken. Om met Bèta Burgerschap aan de slag te gaan en het netwerk denken en de discussie doeltreffend te begeleiden, blijkt het professionaliseringstraject van toegevoegde waarde te zijn.
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VIBRO-ACOUSTICAL PERFORMANCE OF A STEEL BEAM OF GROOVE PROFILE: FIELD TEST AND NUMERICAL ANALYSIS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.063.

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To meet the development needs of rail transit, steel beams are more widely used in bridges, which brings more significant vibration and noise problems. In this paper, the dynamic characteristics of a steel beam of groove profile are investigated through field test and numerical analysis. Firstly, under the hammering excitation, the vibration response of the slabs in a descending order are right web, left web and bottom slab. The vibration response is related to the distance from the response position to the excitation source and the stiffness of slabs. Then, a numerical model of the steel beam is established based on the hybrid FE-SEA method. The results of field test are consistent with the numerical simulation, which confirms the effectiveness of the hybrid FE-SEA method when analyzing the steel beam. Finally, by comparing the sound power level radiated from different slabs in three zones, it can be concluded that the sound power level is related to the distance from the test position to the excitation source. The overall sound power level will increase when canceling transverse connection system, and center excitation has a more significant effect than off-center excitation.
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Inleiding: Natuurrapport - Aan de slag met ecosysteemdiensten Technisch rapport - Hoodstuk 1. Instituut voor Natuur- en Bosonderzoek, 2016. http://dx.doi.org/10.21436/inbor.12342758.

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7

Een heldere ecosysteemdienstentaal : Natuurrapport - Aan de slag met ecosysteemdiensten Technisch rapport - Hoodstuk 6. Instituut voor Natuur- en Bosonderzoek, 2016. http://dx.doi.org/10.21436/inbor.12342954.

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Het ecosysteemdienstenconcept als ondersteuning van bovenlokale visievorming : Natuurrapport - Aan de slag met ecosysteemdiensten Technisch rapport - Hoodstuk 3. Instituut voor Natuur- en Bosonderzoek, 2016. http://dx.doi.org/10.21436/inbor.12342876.

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9

Beoordelingskaders van ecosysteemdiensten bij ontbossingen en bebossingen : Natuurrapport - Aan de slag met ecosysteemdiensten Technisch rapport - Hoodstuk 5. Instituut voor Natuur- en Bosonderzoek, 2017. http://dx.doi.org/10.21436/inbor.12567611.

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10

Maatregelen om het ESD-aanbod van landbouw te verhogen : Natuurrapport - Aan de slag met ecosysteemdiensten Technisch rapport - Hoodstuk 7. Instituut voor Natuur- en Bosonderzoek, 2016. http://dx.doi.org/10.21436/inbor.12342977.

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