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Investigations of physicochemical properties of dusts generated in mechanical reclamation process of spent moulding sands with alkaline resins

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China Foundry 2014年第2期11卷 132-138页

作者： r.Dańko M.Holtzer J.Dańko AGH University of Science and Technology Faculty of Foundry Engineering

Mechanical reclamation processes of spent moulding sands generate large amounts of postreclamation dusts mainly containing rubbed spent binding agents and quartz dusts. The amount of postreclamation dusts, depending in the reclamation system effi ciency and the reclaim dedusting system, can reach 5%-10% in relation to the total reclaimed spent moulding sand. The proper utilization of such material is a big problem facing foundries these days. This study presents the results of investigations of physicochemical properties of post- reclamation dusts. All tested dusts originated from various Polish cast steel plants applying the mechanical reclamation process of moulding sands with alkaline resins, obtained from different producers. Different dusts, delivered from foundries, were tested to determine their chemical composition, granular characterization, physicochemical and energetic properties. Presented results confi rmed assumptions that it is possible to utilize dusts generated during mechanical reclamation of used sands with organic resins as a source of energy.

关键词： dust recycling environmental protection reclamation moulding and core sands energy

Astrocytes in the cerebral cortex play a role in the spontaneous motor recovery following experimental striatal hemorrhage

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Neural regeneration research 2018年第1期13卷 67-68页

作者： Juliana Dalibor Neves régis Gemerasca Mestriner Carlos Alexandre Netto Graduate Program of Physiology Institute of Basic Health Sciences Universidade Federal do Rio Grande do Sul Department of Biochemistry Institute of Basic Health Science Universidade Federal do Rio Grande do Sul Neurorehabilitation and Neural repair research Group Pontifícia Universidade Católica do Rio Grande do Sul

Intracerebral hemorrhage （ICH） is a stroke subtype caused by spontaneous rupture of small vessels and bleeding into the brain paren- chyma, resulting in cell death and sensorimotor deficits. Despite the greater prevalence of the ischemic form of stroke （87%）, ICH has the highest mortality rate of all stroke subtypes. The striatum is the most affected structure in hemorrhagic stroke （35-70%）, followed by cere- bral cortex （15-30%）, brain stem and cerebellum （5-10%）; patients suffering striatal and/or cortical ICH bear persistent sensorimotor disabilities. Although chronic sensorimotor impairment is established, a considerable amount of patients experience some degree of spontaneous recovery during the first six months after stroke （Qureshi et al., 2009）, and the neurobiological basis of this process is not understood.

关键词： Astrocytes in the cerebral cortex play a role in the spontaneous motor recovery following experimental striatal hemorrhage ICH

Electromagnetic processes in a χEFT framework

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Chinese Physics C 2010年第9期34卷 1368-1371页

作者： L.Girlanda S.Pastore r.Schiavilla M.Viviani Department of Physics University of Pisa INFN-Pisa Department of Physics Old Dominion University Jefferson Lab Newport News INFN-Pisa 56127 PisaItaly

recently,we have derived a two–nucleon potential and consistent nuclear electromagnetic currents in chiral effective field theory with pions and nucleons as explicit degrees of *** calculation of the currents has been carried out to include N 3 LO corrections,consisting of two–pion exchange and contact *** latter involve unknown low-energy constants （LECs）,some of which have been fixed by fitting the np Sand P-wave phase shifts up to 100 MeV lab *** remaining LECs entering the current operator are determined so as to reproduce the experimental deuteron and trinucleon magnetic moments,as well as the np cross *** electromagnetic current operator is utilized to study the nd and n 3 He radiative captures at thermal neutron *** we discuss our results stressing on the important role played by the LECs in reproducing the experimental data.

关键词： chiral effective field theory nuclear electromagnetic currents

The Sedimentary Sequence and Palaeogeographic Changes of the South Yellow Sea Since the Olduvai Subchron

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Acta Geologica Sinica(English Edition) 1994年第2期68卷 195-207页

作者： Yang Zigeng Institute of Marine Geology, MGM r, Qingdao, Shandong Institute of Marine Geology MGMR Qingdao Shandong

According to the alternation of terrestrial beds and transgressive beds, the sedimentary sequence of the South Yellow Sea since the Olduvai subchron can be divided into 15 stratigraphical intervals. According to the facies analysis, there are 7 transgressive beds and one bed with transgression marks, and classical transgressive-regressive facies sequence also appears in the major transgressive *** evolution in the shelf area involved 4 periods: (1) 1.70-0.5 Ma B. P. was the stage for the development of the Palaeo-Yangtze river alluvial plain and delta. Tide influenced -river channel sediments formed during the Olduvai have been found in borehole QC2. The river mouth was located near 124°E and during the transgressive stage from 0.97-0.73 Ma B.P. to the east of 122.2°E, a large-scale undersea delta was formed. In the regressive stage, the shelf area became an alluvial plain. (2) 0.50-0.75 Ma B.P. was a multi-transgressive fluctuation stage during which 3 transgressive beds (HVI, HV, HIV)developed, being dated as 0.50-0.30 Ma B.P., 0.27-0.20 Ma B.P. and 127-75 Ka B.P. respectively, with the extent of transgression increasing gradually. Influenced by southeast monsoons, the eastern China continent began to have a larger moisture source. (3) 75-14 Ka B.P. was the lower sea-level stage during the last glacial period. The downcutting depth of rivers was up to -133 m. The palaeo-Yangtze river system flowed northeastwards into the Sea of Japan through the Sea of Japan through the Tsushima and Korean Straits. The interfluvial area became an eroded, weathered high land. In the cores, two short-lived, relatively high sea-level stages were recorded, corresponding to two interstades in the last glacial period. (4) The period since 14 Ka B.P. is the stage for 'Holocene transgression' and the development of the Yellow river-Huaihe river delta. Before 14 Ka the sea level rose to -68 m, and before 11 Ka to -50 m, and the sea-level was once at a standstill or slight

关键词： South Yellow Sea Quaternary sedimentary sequence palaeogeography

Vegetation change as related to terrain factors at two glacier forefronts, Glacier National Park, Montana, U.S.A.

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Journal of Mountain Science 2020年第1期17卷 1-15页

作者： Callie B.LAMBErT Lynn M・rESLEr Yang SHAO David r.BUTLEr Department of Geography Virginia Tech220 Stanger StreetBlacksburgVA24061USA Texas State University Department of GeographySan MarcosTX 78666USA

Glacier recession is a globally occurring trend. Although a rich body of work has documented glacial response to climate warming, few studies have assessed vegetation cover change in recently deglaciated areas, especially using geospatial technologies. Here, vegetation change at two glacier forefronts in Glacier National Park, Montana, *** quantified through remote sensing analysis,fieldwork validation, and statistical ***, we assessed the spatial and temporal patterns of landcover change at the two glacier forefronts in Glacier National Park and determined the role of selected biophysical terrain factors(elevation, slope, aspect, solar radiation, flow accumulation, topographic wetness index, and surficial geology) on vegetation change(from nonvegetated to vegetated cover) at the deglaciated *** imagery of the study locations in 1991, 2003,and 2015 were classified and validated using visual interpretation. Model results revealed geographic differences in biophysical correlates of vegetation change between the study areas, suggesting that terrain variation is a key factor affecting spatialtemporal patterns of vegetation change. At Jackson Glacier forefront, increases in vegetation over some portion or all of the study period were negatively associated with elevation, slope angle, and consolidated bedrock. At Grinnell Glacier forefront,increases in vegetation associated negatively with elevation and positively with solar *** geospatial and field approaches to the study of vegetation change in recently deglaciated terrain are recommended to understand and monitor processes and patterns of ongoing habitat change in rapidly changing mountain environments.

关键词： Land cover change Physical geography Glacial forefronts Vegetation change Glacier National Park Terrain factors

Spectral Vanishing Viscosity Stabilized LES of the Ahmed Body Turbulent Wake

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Communications in Computational Physics 2009年第2期5卷 635-648页

作者： M.Minguez r.Pasquetti E.Serre Lab.J.A.Dieudonne UMR CNRS 6621Universite de Nice-Sophia Antipolis06200 NiceFrance Lab.MSNM-GP UMR CNRS 6181Universite de Provence13451 MarseilleFrance

The paper addresses the Large-Eddy Simulation(LES)of the turbulent wake of the Ahmed car *** this end we use a Fourier-Chebyshev multi-domain solver and the LES capability is implemented through the use of the Spectral Vanishing Viscosity(SVV)method,completed with a near-wall correction.A“pseudo-penalization”technique is used to model the bluff *** of the present SVV-LES results with the experiments and also with a more classical Finite Volume LES are provided.

关键词： Large-eddy simulation spectral vanishing viscosity spectral methods wakes turbulence

Evaluation of forecasting methods from selected stock market returns

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Financial Innovation 2019年第1期5卷 724-739页

作者： M.Mallikarjuna r.Prabhakara rao Doctoral research Scholar Department of EconomicsSri Sathya Sai Institute of Higher LearningVidyagiriPrasanthi NilayamAPIndia

Forecasting stock market returns is one of the most effective tools for risk management and portfolio *** are several forecasting techniques in the literature for obtaining accurate forecasts for investment decision *** empirical studies have employed such methods to investigate the returns of different individual stock ***,there have been very few studies of groups of stock markets or *** findings of previous studies indicate that there is no single method that can be applied uniformly to all *** this context,this study aimed to examine the predictive performance of linear,nonlinear,artificial intelligence,frequency domain,and hybrid models to find an appropriate model to forecast the stock returns of developed,emerging,and frontier *** considered the daily stock market returns of selected indices from developed,emerging,and frontier markets for the period 2000–2018 to evaluate the predictive performance of the above *** results showed that no single model out of the five models could be applied uniformly to all ***,traditional linear and nonlinear models outperformed artificial intelligence and frequency domain models in providing accurate forecasts.

关键词： Financial markets Stock returns Linear and nonlinear Forecasting techniques root mean square error

Consolidation of soft clay foundation improved by geosyntheticreinforced granular columns:Numerical evaluation

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Journal of rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1173-1181页

作者： Nima r.Alkhorshid Gregório L.S.Araujo Ennio M.Palmeira Institute of Integrated Engineering Federal University of Itajubáe Itabira CampusItabiraMinas Gerais35903-087Brazil Department of Civil and Environmental Engineering University of BrasíliaBrasíliaDistrito Federal70910-900Brazil

Soft clays are problematic soils as they present high compressibility and low shear *** are several methods for improving in situ conditions of soft *** on the geotechnical problem’s geometry and characteristics,the in situ conditions may require reinforcement to restrain instability and construction *** columns reinforced by geosynthetic material are widely used to reduce settlements of embankments on soft *** also accelerate the consolidation rate by reducing the drainage path’s length and increasing the foundation soil’s bearing *** this study,the performance of encased and layered granular columns in soft clay is investigated and *** numerical results show the significance of geosynthetic stiffness and the column length on the embankment ***,the results show that granular columns may play an important role in dissipating the excess pore water pressures and accelerating the consolidation settlements of embankments on soft clays.

关键词： Geosynthetic Embankment Granular column Consolidation Soft soil

Cultural Landscape in World Heritage Conservation and Cultural Landscape Conservation Challenges in Asia

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Built Heritage 2018年第3期2卷 3-26页

作者： Mechtild rössler roland Chih-Hung Lin World Heritage Centre United Nations EducationalScientific and Cultural OrganisationParisFrance

UNESCO was the first United Nations agency to deal with landscapes at a global scale,notably through the World Heritage *** 1992,‘Cultural Landscapes’became a new category on the World Heritage List combining works of nature and of humankind:cultural landscapes often illustrate a specific relation between people and nature and can reflect techniques of sustainable land use,fostering strong links between culture and sustainable *** such as the UNESCO-Greece Melina Mercouri International Prize highlight outstanding examples of safeguarding activities at the world’s major cultural landscapes and offer opportunities to share good practices and create *** landscapes face numerous threats across the world,and especially in Asia,with its growing infrastructure development and *** article shares some of the knowledge and experience garnered by UNESCO through its conservation and management activities at cultural landscapes in Asia(Bamiyan Valley in Afghanistan,Bhutan,Silk roads heritage corridors)and highlights the urgent need for a cultural-historical-natural territory approach to address the pressing challenges for the conservation of Cultural Landscapes in ***,the article advocates for a strong focus on the peoples and communities that inhabit these territories and their involvement at all stages.

关键词： cultural landscape World Heritage conservation management Asia Bhutan Bamiyan Silk roads