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Artigos de revistas sobre o assunto "Group W Productions"
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Yang, Fengqi, Won-Young Cho, Nayeon Lee, Da-Hee Kim, Jihye Lee, Hyun-Jin Lee, Han Geuk Seo e Chi-Ho Lee. "Effects of Boswellia Serrata and Whey Protein Powders on Physicochemical Properties of Pork Patties". Foods 9, n.º 3 (12 de março de 2020): 334. http://dx.doi.org/10.3390/foods9030334.
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Processed meat products are prone to oxidative damage and quality decline during storage; however, these problems can be mitigated by the proper formulation of meat productions. This study evaluated the effects of natural anti-oxidants found in Boswellia serrata (B), whey protein powder (W), and their combination on pork patties during storage, exploring changes in textural properties and lipid oxidation susceptibility. The 2% whey-added group exhibited a higher crude protein content than the untreated control group. The highest water-holding capacity and lowest cooking losses were observed in mixed-additive groups (WB1 (2% W/0.5% B) and WB2 (2% W/1.0% B), and the highest sensory scores for overall acceptability were obtained for WB1. Adding B. serrata can neutralize the hardness caused by whey powder, thereby improving palatability. From 7 d (days 7), the extents of lipid oxidation, determined using 2-thiobarbituric acid-reactive substances (TBARS) analysis, for the WB1 and WB2 groups were significantly lower than that of the control group. The WB1 and WB2 groups exhibited substantially suppressed total bacterial colony and Escherichia coli counts relative to the control group. Our findings suggest that the additive combination of B. serrata and whey protein powders can suppress lipid oxidation, improve storage stability, and enhance textural properties in the production of functional pork patties.
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Chaney, Carolyn. "Acoustic Analysis of Correct and Misarticulated Semivowels". Journal of Speech, Language, and Hearing Research 31, n.º 2 (junho de 1988): 275–87. http://dx.doi.org/10.1044/jshr.3102.275.
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Four children who produced correct /w,r,l,j/, four children with developmental w/r and w/l substitutions, and four articulation impaired children with w/r and w/l substitutions were subjects. They produced sets of minimally contrasted words with /w,r,l,j/ in word-initial position with four vowels and with /w,r,l/ in two types of consonant clusters. Children's utterances were spectrographically analyzed for three formant frequencies and transition rate of the second formant. Children with correct semivowels produced distinctive formant frequency patterns for semivowels that were similar to those previously reported in the literature for adults and children. Developmental and articulation impaired children produced acoustic features for /j/ that were similar to the /j/ produced by the control group; but neither group differentiated among /w,r,l/ by either formant frequencies or transition rate. Some individuals in both groups produced formant frequency and/or transition rate differences among semivowels in some phonetic contexts. The /w/ produced for target /w/ and in substitution for /r/ and /l/ by three developmental children and two articulation-impaired children did not match the acoustic pattern of control /w/. These productions had higher second formants, occurring between control /w/ and /r,l/ or in the range of correct /r,l/.
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Zhao, Yanbing, Caiqian Yang, Chengyu Yan, Jing Yang e Zhiren Wu. "Design and Properties of Coal Gangue-Based Geopolymer Mortar". Buildings 12, n.º 11 (9 de novembro de 2022): 1932. http://dx.doi.org/10.3390/buildings12111932.
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The feasibility of preparing coal gangue-based geopolymer mortar (CGBGM) with composite-activated coal gangue was experimentally explored in this paper. The effects of water-to-binder ratio (W/B), alkali content (A), and slag content (S) on the fluidity and performances of the CGBGM were experimentally investigated. The ANOVA method was employed to evaluate the significance level of influenced factors. Moreover, the microstructure, element compositions, and qualitative microanalysis of the CGBGM at various curing ages were verified by ESEM-EDS. Test results denoted that the mechanical properties of the CGBGM are superior to that of ordinary Portland cement mortar (OPCM). The flexural and compressive strength of the CGBGM rapidly increases before 7 d and then tends to slow afterward. According to the impact degree on the flexural and compressive strength of the CGBGM, the S is ranked first, followed by the A, and finally the W/B. The flexural and compressive strength of specimens with 40% slag increased by 45.97% and 90.75%, respectively, compared to the control group. However, the A and W/B have little effect on flexural strength. In addition, the hydration productions filled in the crevice and healed the entrapped microcracks in the hardened paste with the increase in curing ages, forming a dense microstructure. The Ca/Si decreased from 0.5 at 3 d to 0.06 at 28 d, and the Ca/Al decreased from 0.25 at 3 d to 0.05 at 28 d. Finally, the difference in drying shrinkage behavior between the CGBGM and OPCM was systematically analyzed.
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Moreno–Torres, Ignacio, e Enrique Nava. "Consonant and vowel articulation accuracy in younger and middle-aged Spanish healthy adults". PLOS ONE 15, n.º 11 (9 de novembro de 2020): e0242018. http://dx.doi.org/10.1371/journal.pone.0242018.
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Children acquire vowels earlier than consonants, and the former are less vulnerable to speech disorders than the latter. This study explores the hypothesis that a similar contrast exists later in life and that consonants are more vulnerable to ageing than vowels. Data was obtained with two experiments comparing the speech of Younger Adults (YAs) and Middle–aged Adults (MAs). In the first experiment an Automatic Speech Recognition (ASR) system was trained with a balanced corpus of 29 YAs and 27 MAs. The productions of each speaker were obtained in a Spanish language word (W) and non–word (NW) repetition task. The performance of the system was evaluated with the same corpus used for training using a cross validation approach. The ASR system recognized to a similar extent the Ws of both groups of speakers, but it was more successful with the NWs of the YAs than with those of the MAs. Detailed error analysis revealed that the MA speakers scored below the YA speakers for consonants and also for the place and manner of articulation features; the results were almost identical in both groups of speakers for vowels and for the voicing feature. In the second experiment a group of healthy native listeners was asked to recognize isolated syllables presented with background noise. The target speakers were one YA and one MA that had taken part in the first experiment. The results were consistent with those of the ASR experiment: the manner and place of articulation were better recognized, and vowels and voicing were worse recognized, in the YA speaker than in the MA speaker. We conclude that consonant articulation is more vulnerable to ageing than vowel articulation. Future studies should explore whether or not these early and selective changes in articulation accuracy might be caused by changes in speech perception skills (e.g., in auditory temporal processing).
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ARNOWITT, R., V. BARGER, M. BARNETT, R. BLAIR, L. CLAVELLI, N. G. DESHPANDE, M. DREES et al. "SUPERSTRINGS: GROUP REPORT". International Journal of Modern Physics A 02, n.º 04 (agosto de 1987): 1097–112. http://dx.doi.org/10.1142/s0217751x87000491.
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A summary is given of the results obtained by the Superstring working group. New physics phenomena arising from superstring models that might be detected at the SSC as well as their possible backgrounds were investigated. Topics examined were models with extra Z bosons and right handed W bosons, detection of Winos, Zinos and gluinos and production of heavy squarkonium.
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DAMAZIAK, Krzysztof, Monika MICHALCZUK e Anna KUREK. "Comparsion of production performance of two genetic groups of turkeys reared in the Semi-intensive system". Journal of Central European Agriculture 13, n.º 3 (2012): 403–15. http://dx.doi.org/10.5513/jcea01/13.3.1064.
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Yun, Mi-Young, e Hye-Won Kim. "Effects of Trichosanthis Radix Extract on Collagen Production". Journal of the Korean Society of Cosmetology 30, n.º 2 (30 de abril de 2024): 408–14. http://dx.doi.org/10.52660/jksc.2024.30.2.408.
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This study was conducted to study the effects of Trichosanthis Radix water extract (TR-W) and Trichosanthis Radix 60% ethanol extract (TR-E) on collagen production. As a result of conducting a cytotoxicity experiment on HDFn cells and RAW 264.7 cells, the experiment was conducted at a concentration of TR-W and TR-E at 100 mg/ml, which does not significantly affect the survival rate in HDF and RAW 264.7 cells. The effect on collagen synthesis ability showed an increase of 52% for the positive control group L-AA (vitamin C) 52% for TR-W 25% and TR-E 36% at 100 mg/ml proving its effect on collagen synthesis ability. In terms of inhibition of MMP-1 expression related to collagen damage L-AA (vitamin C) a positive control group, showed an inhibitory effect of 54%, and TR-W and TR-E showed an inhibitory effect of 72% and 68% at 100 mg/ml, thereby inhibiting collagen decomposition enzyme. MMP-1 was stably inhibited. Compared to Control, the free radical scavenging activity of L-AA (vitamin C) a positive control group, showed a scavenging activity of 108.4%, and in TR-W and TR-E, it showed an inhibitory effect of 93.4% and 98.2% at 100 mg/ml. In NO related to inflammation, showed an anti-inflammatory effect of 67.4% and 50.2% at a concentration of 100 mg/ml of TR-W and TR-E compared to the control group, which is expected to have a positive effect on collagen production due to inflammation. This study The results are judged to have the highest utility value as a functional cosmetic material considering the stability of the skin in the future.
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Kulykovets, Olena, Maria Jeznach, Małgorzata Kosicka-Gębska e Anna Kudlińska-Chylak. "Kształtowanie się rynku miodu w krajach Unii Europejskiej w latach 2001–2013". Zeszyty Naukowe SGGW - Ekonomika i Organizacja Gospodarki Żywnościowej, n.º 120 (29 de dezembro de 2017): 111–20. http://dx.doi.org/10.22630/eiogz.2017.120.42.
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The article presents changes in honey production in the countries of EU in years 2001–2013. The method used in the article divided honey producers by size of the production: large, medium and small. Honey production in the group of small producers was the most dynamically growing, where the average annual growth rate was 2.93% in the considered period. Identified large volatility of honey production in the EU, which indicates the uncertainty and strong reactions of producers to the market situation. Therefore it is very important to support apiculture programs as contribution to the increasing of honey production and consumption in the respective countries.
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Priyanto, Slamet, Anansya Putri Intan, Bambang Rianto, Tutuk Djoko Kusworo, Bambang Pramudono, Edi Untoro e Puspa Ratu. "The Effect of Acid Concentration (H2SO4) on the Yield and Functional Group during Lignin Isolation of Biomass Waste Pulp and Paper Industry". Reaktor 19, n.º 4 (31 de dezembro de 2019): 162–67. http://dx.doi.org/10.14710/reaktor.19.4.162-167.
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Declining oil production in Indonesia lately has been much discussed by industrial practitioners, especially from the petroleum industry. The decrease is due to the age of old drilling wells with high water cut (> 90%), so it is necessary to pursue a production method that can increase the production of these old wells. The EOR (Enhanced Oil Recovery) method is one way of extracting oil from oil wells that cannot be further retrieved by injecting materials that are not in the reservoir. One ingredient that can be injected is Sodium Ligno Sulfonate (SLS) surfactant derived from lignin. Lignin was obtained from the lignin isolation process from Black Liquor, which in this study came from the pulp and paper mill waste of PT. Indah Kiat, Pekanbaru, Sumatra, Indonesia. This study aims to determine the effect of variations in H2SO4 concentrations (concentrations of 15%, 20%, 25%, 30% w/w) on the yield of lignin isolation results, and to compare the functional groups between dirty lignin, clean lignin, and pure lignin using FT-IR. Based on the research results, it was found that the best lignin is lignin with an H2SO4 concentration of 20%, with the highest yield and the color of lignin produced tends to be similar to pure lignin. In addition, it was found that the peak of the net lignin group had more similarity with commercial lignin compared to crude lignin. Keywords: Lignin, Black Liquor, Enhanced Oil Recovery (EOR), FTIR
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Popczyk, Magdalena, Julian Kubisztal, Bożena Łosiewicz e A. Budniok. "Production and Electrochemical Characterization of Nickel Based Composite Coatings Containing Chromium Group Metal and Silicon Powders". Solid State Phenomena 228 (março de 2015): 219–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.228.219.
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The Ni+Cr+Si, Ni+Mo+Si and Ni+W+Si composite coatings were obtained by electrodeposition of crystalline nickel from an electrolyte containing suspension of suitable metallic and non-metallic components (Cr, Mo, W and Si). These coatings were obtained galvanostatically at the current density of jdep = -0.100 A cm-2 and at the temperature of 338 K. Chemical composition of the coatings was determined by energy dispersive spectroscopy (EDS). The electrochemical activity of these electrocatalysts was studied in the process of hydrogen evolution reaction (HER) in 5 M KOH solution using steady-state polarization and electrochemical impedance spectroscopy (EIS) methods. The kinetic parameters of the HER on particular electrode materials were determined. It was found that Ni+Mo+Si composite coatings are characterized by enhanced electrochemical activity towards the HER as compared with Ni+W+Si and Ni+Cr+Si coatings due to the presence of Mo and increase in electrochemically active surface area.
Livros sobre o assunto "Group W Productions"
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Singleton, Jermaine. Introduction. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252039621.003.0001.
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This introductory chapter provides an overview of the book's main themes. This book explores the disavowed claims of the past on the present through a group of cultural productions—literature, drama, and film—focused on racialized subject-formations and cultural formations. Investigating the intersection of categories of social difference, nation making, and buried social memory, it uncovers a host of hidden dialogues for the purpose of dismantling the legacy effects of historical racial subjugation and inequality. The book brings psychoanalytic paradigms of mourning and melancholia and discussions of race and performance by W. E. B. Du Bois, Frantz Fanon, Julian Carter, Diana Taylor, and Kimberly Benton into conversation with literary work on post-Emancipation America's everyday life and ritual practice to challenge scholarship that calls for the clinical separation of ethnic studies and psychoanalysis as well as the divorce of psychoanalysis and socioeconomic history, and presumes that this disengagement is central to American nationhood's continued relationship with unresolved racial grievances. This study develops a theory of “cultural melancholy” that uncovers the ideological and psychical claims of the history of slavery and ongoing racial subjugation on contemporary racialized subject-formations and dominant American culture.
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Hugh-Jones, Martin E. Animal Health and Production at Extremes of Weather: Reports of the Cagm Working Groups on Weather and Animal Disease and Weather and Animal Health (W M O (Series)). World Meteorological, 1989.
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Mitchell, Koritha. From Slave Cabins to the White House. University of Illinois Press, 2020. http://dx.doi.org/10.5622/illinois/9780252043321.001.0001.
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This book argues for a new reading practice. Rather than approach art and literature from marginalized groups as examples of protest or as responses to “dominant” culture, it demonstrates the power of reading through the lens of achievement, using case studies from black expressive culture. Even while bombarded with racist and sexist violence, African Americans remain focused on defining, redefining, and pursuing success. By examining canonical examples of black women’s cultural production, this study reveals how African Americans keep each other oriented toward accomplishment through an ongoing, multivalent community conversation. Analyzing widely taught and discussed works from the 1860s to the present (via Michelle Obama’s public persona), the book traces “homemade citizenship”—the result of practices of making-oneself-at-home, practices of affirming oneself while knowing violence will answer one’s achievements and assertions of belonging. The texts examined include Harriet Jacobs’s Incidents in the Life of a Slave Girl (1861), Elizabeth Keckley’s Behind the Scenes; Or, Thirty Years a Slave and Four Years in the White House (1868), Frances E. W. Harper’s Iola Leroy (1892), Pauline Hopkins’s Contending Forces (1900), Nella Larsen’s Quicksand (1928), Zora Neale Hurston’s Their Eyes Were Watching God (1937), Lorraine Hansberry’s A Raisin in the Sun (1959), Alice Childress’s Wine in the Wilderness (1969), Octavia Butler’s Kindred (1979), Toni Morrison’s Beloved (1987), and Michelle Obama’s first lady persona. [220 of 225 words]
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Sobczyk, Eugeniusz Jacek. Uciążliwość eksploatacji złóż węgla kamiennego wynikająca z warunków geologicznych i górniczych. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN, 2022. http://dx.doi.org/10.33223/onermin/0222.
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Hard coal mining is characterised by features that pose numerous challenges to its current operations and cause strategic and operational problems in planning its development. The most important of these include the high capital intensity of mining investment projects and the dynamically changing environment in which the sector operates, while the long-term role of the sector is dependent on factors originating at both national and international level. At the same time, the conditions for coal mining are deteriorating, the resources more readily available in active mines are being exhausted, mining depths are increasing, temperature levels in pits are rising, transport routes for staff and materials are getting longer, effective working time is decreasing, natural hazards are increasing, and seams with an increasing content of waste rock are being mined. The mining industry is currently in a very difficult situation, both in technical (mining) and economic terms. It cannot be ignored, however, that the difficult financial situation of Polish mining companies is largely exacerbated by their high operating costs. The cost of obtaining coal and its price are two key elements that determine the level of efficiency of Polish mines. This situation could be improved by streamlining the planning processes. This would involve striving for production planning that is as predictable as possible and, on the other hand, economically efficient. In this respect, it is helpful to plan the production from operating longwalls with full awareness of the complexity of geological and mining conditions and the resulting economic consequences. The constraints on increasing the efficiency of the mining process are due to the technical potential of the mining process, organisational factors and, above all, geological and mining conditions. The main objective of the monograph is to identify relations between geological and mining parameters and the level of longwall mining costs, and their daily output. In view of the above, it was assumed that it was possible to present the relationship between the costs of longwall mining and the daily coal output from a longwall as a function of onerous geological and mining factors. The monograph presents two models of onerous geological and mining conditions, including natural hazards, deposit (seam) parameters, mining (technical) parameters and environmental factors. The models were used to calculate two onerousness indicators, Wue and WUt, which synthetically define the level of impact of onerous geological and mining conditions on the mining process in relation to: —— operating costs at longwall faces – indicator WUe, —— daily longwall mining output – indicator WUt. In the next research step, the analysis of direct relationships of selected geological and mining factors with longwall costs and the mining output level was conducted. For this purpose, two statistical models were built for the following dependent variables: unit operating cost (Model 1) and daily longwall mining output (Model 2). The models served two additional sub-objectives: interpretation of the influence of independent variables on dependent variables and point forecasting. The models were also used for forecasting purposes. Statistical models were built on the basis of historical production results of selected seven Polish mines. On the basis of variability of geological and mining conditions at 120 longwalls, the influence of individual parameters on longwall mining between 2010 and 2019 was determined. The identified relationships made it possible to formulate numerical forecast of unit production cost and daily longwall mining output in relation to the level of expected onerousness. The projection period was assumed to be 2020–2030. On this basis, an opinion was formulated on the forecast of the expected unit production costs and the output of the 259 longwalls planned to be mined at these mines. A procedure scheme was developed using the following methods: 1) Analytic Hierarchy Process (AHP) – mathematical multi-criteria decision-making method, 2) comparative multivariate analysis, 3) regression analysis, 4) Monte Carlo simulation. The utilitarian purpose of the monograph is to provide the research community with the concept of building models that can be used to solve real decision-making problems during longwall planning in hard coal mines. The layout of the monograph, consisting of an introduction, eight main sections and a conclusion, follows the objectives set out above. Section One presents the methodology used to assess the impact of onerous geological and mining conditions on the mining process. Multi-Criteria Decision Analysis (MCDA) is reviewed and basic definitions used in the following part of the paper are introduced. The section includes a description of AHP which was used in the presented analysis. Individual factors resulting from natural hazards, from the geological structure of the deposit (seam), from limitations caused by technical requirements, from the impact of mining on the environment, which affect the mining process, are described exhaustively in Section Two. Sections Three and Four present the construction of two hierarchical models of geological and mining conditions onerousness: the first in the context of extraction costs and the second in relation to daily longwall mining. The procedure for valuing the importance of their components by a group of experts (pairwise comparison of criteria and sub-criteria on the basis of Saaty’s 9-point comparison scale) is presented. The AHP method is very sensitive to even small changes in the value of the comparison matrix. In order to determine the stability of the valuation of both onerousness models, a sensitivity analysis was carried out, which is described in detail in Section Five. Section Six is devoted to the issue of constructing aggregate indices, WUe and WUt, which synthetically measure the impact of onerous geological and mining conditions on the mining process in individual longwalls and allow for a linear ordering of longwalls according to increasing levels of onerousness. Section Seven opens the research part of the work, which analyses the results of the developed models and indicators in individual mines. A detailed analysis is presented of the assessment of the impact of onerous mining conditions on mining costs in selected seams of the analysed mines, and in the case of the impact of onerous mining on daily longwall mining output, the variability of this process in individual fields (lots) of the mines is characterised. Section Eight presents the regression equations for the dependence of the costs and level of extraction on the aggregated onerousness indicators, WUe and WUt. The regression models f(KJC_N) and f(W) developed in this way are used to forecast the unit mining costs and daily output of the designed longwalls in the context of diversified geological and mining conditions. The use of regression models is of great practical importance. It makes it possible to approximate unit costs and daily output for newly designed longwall workings. The use of this knowledge may significantly improve the quality of planning processes and the effectiveness of the mining process.
Capítulos de livros sobre o assunto "Group W Productions"
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Sambor, Barbara. "Niepożądane cechy fonetyczne samogłosek a zaburzenia czynności prymarnych u osób dorosłych". In Problemy badawcze i diagnostyczne w logopedii. Wydawnictwo Uniwersytetu Łódzkiego, 2016. http://dx.doi.org/10.18778/8088-476-2.11.
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The author carried out her research in an attempt to analyse the concomitance between the tongue’s primary motor patterns (based on primary functions, like swallowing and breathing) and non‑normative features in the articulation of vowels in adults. The presented study has been conducted on two groups of adults; the study group consisted of 42 patients with an incorrect swallowing and tongue at rest posture but without any coexisting structural impairments; the control group (n = 35) had no structural nor functional abnormalities. The obtained results indicate that abnormal swallowing and tongue at rest posture may lead to some disruption in vowel production, manifested by undesirable dorsality and/or nasal resonance.
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Curry, Niall, e Elaine Riordan. "Intelligent CALL Systems for Writing Development". In CALL Theory Applications for Online TESOL Education, 252–73. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-6609-1.ch011.
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Technological innovation in supporting feedback on writing is well established in computer-assisted language learning (CALL) literature. Regarding writing development, research has found that intelligent CALL systems that respond instantly to learners' language can support their production of better-written texts. To investigate this claim further, this chapter presents a study on learner use of Write & Improve (W&I). The study, based on learner engagement with W&I and learner and teacher surveys and focus groups, demonstrates that learners find W&I to be engaging and motivating. Moreover, there is evidence of improvements in learner writing practices and written language proficiency. For teachers, W&I can render feedback more efficient, allowing them to focus on more complex aspects of learner texts, while spelling and syntactic accuracy are addressed by W&I. Issues also emerge in the use of W&I, which present problem areas for teachers and learners and which signal important future considerations for CALL research.
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Gajewska, Klaudia. "Gry jako źródło mowy spontanicznej w kontekście ćwiczenia wymowy przez polskich średnio zaawansowanych uczniów języka angielskiego jako obcego". In Ludyczność w (glotto)dydaktyce. Wydawnictwo Uniwersytetu Łódzkiego, 2020. http://dx.doi.org/10.18778/8220-114.7.06.
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The objective of the current article is to find out which of the three genres differing in the level of the spontaneity – a read-aloud task, presentation or spontaneous speech – has a positive influence on the quality of the students’ pronunciation with regard to a set of selected lexical items. Moreover, it aims to discover whether the types of utterances produced by EFL learners affect their emotional well-being during foreign language speech production. The article has been divided into two complementary parts. The first one introduces theoretical background to the issue of speaking, pronunciation and elicitation of oral language with the help of visuals and storytelling. The second one, on the other hand, describes the procedure as well as the results of the experimental study and a questionnaire survey that were conducted with a group of 15 secondary school students. The data point to the advantage of presentations over other types of oral performance both with respect to speaking and pronunciation practice as well as the students’ mental state. However, further research is necessary to prove the correctness of the above-mentioned statement.
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Żak, Marek. "Kino w powojennej Legnicy (1945–1950)". In Okno na przeszłość: Szkice z historii wizualnej, T. 4, 149–92. Ksiegarnia Akademicka Publishing, 2021. http://dx.doi.org/10.12797/9788381386197.09.
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CINEMA IN POST-WAR LEGNICA (1945-1950) The publication focuses on the activity of the following cinemas in Legnica from the spring of 1945 to the end of 1950: Polonia [Polish Diaspora] (later Ognisko [Hearth]), Bałtyk [The Baltic] and Piast [Piast], as well as cinemas organised and run by the Group of Northern Forces. So far, this subject has not been adequately discussed, which constitutes a significant gap in the knowledge of the culture and entertainment in Legnica after the war. The publication describes the circumstances of the cinemas’ establishment, organisational changes (including changes of location), as well as their activity and the problems it caused. As far as the available sources allowed, the cinema repertoire of the time has also been analysed. Information on the year of production, original title and director (or directors) are provided for each of the films that were successfully identified.
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Luckhurst, Roger. "Making Connections: W. T. Stead’s Occult Economies". In The Invention of Telepathy 1870-1901, 117–47. Oxford University PressOxford, 2002. http://dx.doi.org/10.1093/oso/9780199249626.003.0004.
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Abstract In many histories of the fin de siècle one dominant concern has been to outline the Modern formation of high and low culture-indeed, of the very terms ‘high’ and ‘low’ as discriminations. A new mass market serviced a burgeoning urbanized and literate population that had increasing surplus wages and leisure hours. Spectator sports, music halls, seaside resorts, cheap transport, and patterns of holidays generated new mass entertainment and rhythms of living. The economics of massification required heavy capitalization and triggered a revolution in consumption. The logic of mass production also prompted new types of politics. Spectacles of patriotic and imperial fervour in ceremonial marches, public exhibitions, and displays were shadowed by oppositional demonstrations, from anarchist ‘outrages’ and mass marches of the unemployed to socialist groups and trade unions.
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Ślosarski, Bartosz. "Abstrakcyjna i konkretna definicja pracy opiekuńczej w Polsce". In Kobiety niepokorne. Reformatorki – buntowniczki – rewolucjonistki. Wydawnictwo Uniwersytetu Łódzkiego, 2015. http://dx.doi.org/10.18778/7969-873-8.16.
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The main aim of the article is reflection on the definition of ca ring labour. In reference to the broad definition of work, which is focused on the workforce (re)production, I want to investigate aspects of organizing revolt by representatives of caring labour. In my article, I akcept the marxist and postoperaist perspective to define reproductive/caring labor. Postoperaists are looking for basis of struggles in the objective process of production, but they also assume that the full constitution of workers comes only during the common struggle. In the first part of my article I am recalling an abstract definition of reproductive labor, and then, in further parts, I will consistently build the concrete analysis - and therefore introduce a historical aspect (related to the history of the welfare sector in Poland), formal-legal (related to the current reform of the caring labour), local aspect (ie referring to the conditions labor and workers protest of caring labour in Poznan). I will use the encountered materials, in particular manifestos, proclamations and media statements – it will lead me to determine not only the items listed above, but also how these workers cooperate with other groups in the city.
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Barmawi Khairurrijal, M. "Microwave plasma chemical vapour deposition: a model for the production of thin carbon films, with possible extension to silicon". In Chemistry and Technology of Silicon and Tin, 405–10. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198555803.003.0032.
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Abstract A simple plasma CVD reactor has been built using a 500 W, 2.45 GHz microwave oven as a plasma generator. The reactor has been used to deposit carbon from liquid natural gas onto glass plates. The rate of deposition is 34 As-1 and films typically of 6 |xm thickness can be conveniently obtained. The carbon films have been analysed by FT-IR spectroscopy and found to contain sp, sp2, and sp3 hybridized carbon fragments; there are also indications of the presence of C=O and C=S groups. The reactor offers much scope for similar studies on thin silicon films.
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Terranova, Francesco. "The electroweak theory". In A Modern Primer in Particle and Nuclear Physics, 347–67. Oxford University PressOxford, 2021. http://dx.doi.org/10.1093/oso/9780192845245.003.0012.
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Abstract The unification of weak and electromagnetic interactions is described here. The unified theory (electroweak theory) is presented starting from the V-A in analogy with QED and QCD since it is based on the SU(2)xU(1) gauge group. We emphasize the experimental confirmations of such a great achievement: the discovery of neutral currents by the Gargamelle experiment and the on-shell observation of the W and Z bosons at CERN. The chapter provides readers with modern tools for the production of neutrino beams and the identification of high-mass particles at hadron colliders. Finally, precision electroweak physics, where the existence of new particles can be inferred by quantum corrections, is introduced. This statement is substantiated with an amazing finding from the Large Electron–Positron (LEP) collider: the number of light-active neutrinos cannot be greater than three.
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Michnik, Monika, e Karol Dzięgielewski. "Chronologia i rozwój przestrzenny nekropoli / Chronology and spatial development of the cemetery". In Cmentarzysko w wczesnej epoki żelaza w Świbiu na Górnym Śląsku. Tom 2, 114–26. Wydawnictwo Profil-Archeo, 2022. http://dx.doi.org/10.33547/swibie2022.2.4.
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By applying the seriation method to a group of 129 assemblages distinguished by a ‘non-male’ model of grave furnishing and containing at least two distinctive metal objects, it was possible to divide the lifespan of the cemetery into three chronological stages. These were characterised by stylistically different (but interlocking) sets of ornaments and dress items. An attempt to relate these phases to the periodisation systems developed for the areas to the north, west, and south confirmed contacts with the Oder zone as early as during the early phase, which we synchronise with Ha C1b. What has also emerged in the course of the present study is another factor characteristic of this early phase, one that has not been taken into account in previous studies, namely the evidence of contacts with the northern lowland zone. These are legible mainly in the distinctive style of neck and hand ornaments: necklaces of the Wendelringe or unidirectionally twisted type, with loops or fastened with a hook, usually occurring no further south than Greater Poland, and bracelets with distant Pomeranian references. The presence of this style seems to have contributed in subsequent phases to the production of local types of ring ornaments (e.g., pointed necklaces of the Mąkolice type). The presence of northern bronzes of possibly such an early chronology (Ha C1) in the Polish Plain, especially at its southern edge, has so far been only sporadically reported, especially in the range of the Upper Silesian-Lesser Poland group. Nevertheless, contacts with the north at the turn of the Bronze Age and early Iron Age have already been suggested in the context of the northwards ‘diffusion’ of the idea of inhumation. early phase reveal strong influences coming evidently from the south, from the Moravian Gate region. This is indicated by the appearance of bracelets with thickened ends (e.g., Kietrz type) or richly decorated necklaces fastened with a hook (Domasław type) in many graves of this phase. The exact temporal relationship between the two groups of finds is difficult to determine – they appear inseparable on the seriation diagram (Figs. 4.1–2), with the Silesian Hallstatt style continuing much longer, into the middle phase. In addition, the early phase provides evidence that the Świbie community had access to very valuable goods from southern Europe, such as beads made of vitreous materials (glass and glassy faience, still scarce at the time) or flat iron axes with broad heads (Ärmchenbeile of type III3). It is with this phase that the most impressive burial in Świbie, grave 102, is connected. It belonged to a woman furnished with a local button diadem and the largest set of imports in the cemetery, comprising of a glass bead necklace with a unique ‘star’ shaped bead, a bronze harp fibula decorated with chains, a bronze necklace, and perhaps also bracelets (Garbacz-Klempka et al., Chapter 15). Another noteworthy burial from the early phase is grave 125, in which a dyed fabric of dense yarn, undoubtedly imported from eastern Alpine region, was found (Słomska-Bolonek, Antosik, Chapter 12). A phenomenon typical of the early phase is emphasising the status of some women (but from many families) by furnishing their burials not only with prestigious imports but also with sumptuous local ornaments. Among the latter, the most important markers of status and local identity (of traditional dress?) were headbands with sewn-on bronze (less often lead) buttons. In the burial ritual, the primacy of inhumation is evident. This means that an exclusively local population substrate, cultivating traditions derived from previous eras, continued to play significant role, while the role of exogamy was perhaps still limited. Most likely before the end of the early phase, and certainly in the middle phase (Ha C2), we observe a gradual disappearance of northern stylistic inspiration in ornament making. Meanwhile, permanent contacts with the strongly Hallstattized communities from the right-bank Upper Silesia and Central Silesia continued, noticeable mainly in the spectrum of ornaments. Some references to the necropolis at Domasław are evident (decorated necklaces, painted pottery), but there are also clear differences, including the lack of adoption of costume fastened with a brooch or brooches (Fibeltracht) and the absence of aristocratic burials furnished with swords. There are also no direct parallels in Świbie for sumptuous tomb constructions (chambered graves), although this may be due to the well- established local traditions of lining the bottoms of graves with wood, building grave boxes, or using coffins. The increasing occurrence of cremation, sometimes as burials added to earlier inhumation graves (resulting in ‘biritual graves’), may be seen as an expression of the increasing openness of the local population to external influences or as a move away from endogamy. All these phenomena become more pronounced in the late phase, which we synchronise with the developed Ha C2 and Ha D1. From this stage come most of the glass beads found in Świbie. This applies to both complete necklaces and beads placed to graves in smaller numbers, and the number of burials furnished with such beads is higher than in the early phase. Silesian painted vessels, essentially absent in the early phase, now appear in more than a dozen graves, both with and without indicators of high status (Chapter 5). Most of the graves with amber come from this phase. The growing frequency of these middle-class imports is indicative of increasing egalitarianism, which is also reflected by the insignificant proportion of late phase assemblages among the richest grave furnishings in the ranking developed for the cemetery as a whole (Fig. 5.2). This was not due to the disappearance of local ways of prestige signalling – traditional headbands (diadems), for example, are still present, and are even richer (up to 140 buttons). At the same time, from the late phase onwards, all locally manufactured types of ornaments (necklaces, pins, bracelets, ankle-rings) are basically made of iron. Morphologically, these are familiar types, but the raw material from which they are made gradually changes during the middle phase. The change in raw material is often accompanied by a simplification of the original patterns. Given all the evidence for long-distance networks becoming increasingly accessible for a growing proportion of the local community, the rise in popularity of cremation, evident in the late phase and especially towards the end of cemetery’s lifespan, should come as no surprise (Fig. 6.1), as this phenomenon remains, in our view, linked to the growing role of exogamy in marital exchange. The natural and increasingly important partners in this exchange were the Silesian populations, who were also the providers of the above-mentioned goods, and who had for centuries been traditionally following cremation as their burial rite. The most recent burials deposited at Świbie are cremation burials in large pots as urns, such as grave 486 with an iron belt clasp, dated to the turn of the Ha D1/D2 period, deposited on the northern edge of the necropolis.
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Garbacz-Klempka, Aldona, Karol Dzięgielewski e Małgorzata Perek-Nowak. "Analizy metaloznawcze wybranych przedmiotów brązowych i ołowianych z cmentarzyska w Świbiu / Metallographic analyses of selected bronze and lead artefacts from the cemetery at Świbie". In Cmentarzysko w wczesnej epoki żelaza w Świbiu na Górnym Śląsku. Tom 2, 288–337. Wydawnictwo Profil-Archeo, 2022. http://dx.doi.org/10.33547/swibie2022.2.15.
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A comprehensive programme of archaeometric research into the chemical composition and manufacturing technology of Early Iron Age artefacts discovered in Świbie, Upper Silesia, has yielded a number of detailed observations and findings. Sixty-six artefacts from a collection of several hundred large bronzes were targeted for study. Energy dispersive X-ray fluorescence spectroscopy and scanning electron microscopy with micro-area composition analysis were used. In selected cases, non-destructive analysis was carried out by digital X-ray radiography. The study was preceded by macroscopic observation of the artefacts. It was shown that most of the large ring ornaments were made from castings subsequently subjected to numerous forging (reforging and shaping) and finishing treatments. Some of the wares, such as the massive ankle rings, retained many of the characteristics of the original cast, indicating that the finishing treatment was only applied when necessary due to the nature of the product (e.g. visual qualities). Decoration was applied using various techniques, often used in combination with each other (e.g. designing a decoration on a wax model and correcting it on the finished product). It was demonstrated that the characteristic constrictions found on the inside of the massive twisted-bar ankle rings of the Upper Silesia and Sącz (Stary Sącz) types could not be the effect of wear and tear, but evidence of intentional reforging, most likely aimed at creating a place to attach an organic strap to fix the ornament in place on the leg. The research has also identified a new category of imports from the circum-Alpine or Mediterranean areas, namely necklaces with a hooked clasp. The extraordinarily precise ornamental technique observed on the necklace, long known in the literature, from grave 102 (in which other imported luxury goods were also found), required the use of a tool in the type of a tap or a threader, and it has never before been identified in an Early Iron Age context in Poland. Above all, however, these studies made it possible to answer the research questions regarding the sample. The first question concerned the raw material and technological variation of the collection across functional and stylistic categories: Did the objects produced and/or used by the population using the cemetery differ in chemical composition of the alloy and manufacturing technique according to function or style? Although the raw material composition was quite similar for the majority of the artefacts (classic Cu-Sn tin bronze), it emerged that some of them had a slightly different composition, most notably an elevated lead content (above 1.5%, exceptionally up to 9.5%), and that this was not coincidental. More often than not, these objects, such as the necklace from grave 217 or the openwork knife handle fitting from grave 495, demanded castings that, due to their small thickness in the mould, required a special alloy with improved castability. This was not required with massive bronzes or those meant for forging sheet metal for the production of coiled ornaments ; these wares are usually characterised by a low proportion of intentionally added lead as an alloying component. No such consistency can be seen in the manufacture of small ornaments such as buttons or spiral pendants, presumably produced on a day-to-day basis from currently available raw material or from recycled raw material. A satisfactory answer was also obtained to the second main question: Whether it was practised to furnish the deceased with sets uniform in style and raw material (possibly including objects produced especially for the funerary ceremony), or whether the objects amassed in the grave were made from raw material from different sources and at different stages of the buried person’s life. Proceeding from a comparison of all the bronzes from three rich burials (graves 102, N=11; 124, N=12; 574, N=9), it was concluded that they were certainly not furnished with complete ceremonial costumes prepared by one workshop, from one batch of raw material. The only objects that they can be considered sets in terms of both style and workshop are pairs of large bronzes (such as ankle rings or massive bracelets), which were most often made from a homogeneous raw material and probably functioned together from manufacture to deposition in the grave. In the group of small bronzes, this contextual approach (as well as the functional one) confirmed a greater range of raw material patterns.
Trabalhos de conferências sobre o assunto "Group W Productions"
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Lutviyani, Alvina, Endaruji Sedyadi e Ihda Novia Indrajati. "Biosynthesis and Characterization of Edible Films from Kepok Banana Peel Starch with a Combination of Glycerol-Sorbitol Plasticizer". In The 6th International Conference on Science and Engineering. Switzerland: Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-otgy4q.
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Research on making edible films from kepok banana peels with glycerol-sorbitol plasticizer aims to analyze the mechanical properties and functional groups of edible films from kepok banana peels with a comparison of the concentration of the plasticizer combination of glycerol-sorbitol. This research consisted of 3 stages, namely making kepok banana peel starch, making edible films, and characterizing kepok banana peel starch and edible films. The yield of kepok banana peel starch obtained was 11.94%. Edible film production was carried out with variations in the glycerol-sorbitol concentration ratio of 100:0, 75:25, 50:50, 25:75 and 0:100 on a basis of 40% (w/w) of total starch weight. Functional group analysis of kepok banana peel starch and edible film was carried out with Fourier Transform Infrared (FTIR). Testing the characteristics of the edible film includes thickness, tensile strength, elongation, and Young's modulus. The results showed that edible film was successfully made with mechanical properties that tended to comply with the Japanese Industrial Standard (JIS) 1975 on the parameters of thickness, tensile strength, and young's modulus.
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Kobayashi, Isao, Katerina Butron Fujiu, Marcos A. Neves e Mitsutoshi Nakajima. "Recent Developments in Micro/Nanochannel Emulsification for Controlled Production of Monodisperse Emulsions". In ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73107.
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Microfluidic techniques for producing emulsions have been proposed over the last decade. Major advantages of microfluidic techniques include the production of monodisperse emulsions with a coefficient of variation (CV) of typically <5%, superior controllability of droplet size and monodispersity, and in situ microscopic monitoring. Microchannel (MC) emulsification, proposed by our research group, is a unique and robust technique to produce monodisperse emulsions with controlled droplet sizes of >1 μm. In MC emulsification, droplet generation via MC arrays does not require any external shear/elongational stress; i.e., the dispersed phase that passed through MCs is transformed spontaneously into uniform droplets due to hydrodynamic instability of the oil-water interface. Here we present some of the recent findings obtained from MC emulsification studies and the controlled production of monodisperse submicron emulsions by novel nanochannel (NC) emulsification. The first topic on MC emulsification is the influence of operating temperature (10 to 70 °C) on production of oil-in-water (O/W) emulsions using a surface-oxidized silicon MC array plate with an MC depth of 8 μm. The droplet generation results were correlated well with the contact angle of the dispersed phase to the MC walls that was measured using a novel method using parallel long MCs. Another topic on MC emulsification is the development of stainless-steel MC emulsification devices. Stainless-steel MC array plates with an MC depth of 100 or 150 μm were mechanically fabricated using an end mill. The use of the stainless-steel MC array plates enabled stably producing monodisperse O/W emulsions with an average droplet diameter of up to 550 μm. We also recently developed silicon NC array plates with the smallest NC depth of 50 nm. NC emulsification experiments demonstrated successful production of monodisperse submicron O/W emulsions with the smallest average droplet diameter of 480 nm. The diameter of the droplets generated by NC emulsification was measured by a novel technique that exploits nanospace.
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Cavasin, A., T. Brzezinski, S. Grenier, M. Smagorinski e P. Tsantrizos. "W and B4C Coatings for Nuclear Fusion Reactors". In ITSC 1998, editado por Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0957.
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Abstract The development of nuclear fusion reactors is presently considered to be the only possible answer to the world's increasing demand for energy, while respecting the environment. Nuclear fusion devices may be broadly divided into two main groups with distinctively different characteristics: magnetic confinement fusion (MCF) and inertial confinement fusion (ICF) reactors. Although the two nuclear fusion technologies show similarities in energy levels (as high as 3 J/cm2) and type of environment (high temperature plasmas) to be contained, the materials of choice for the protective shields (first wall in the ICF and deflectors in the MCF) differ significantly. In ICF reactors, multiple laser beams are used to ignite the fuel in single pulses. This process exposes the first wall to microshrapnel, unconverted light, x-rays, and neutrons. B4C is a low Z material that offers high depth x-ray absorption to minimize surface heating, is not activated by neutrons (will not become radioactive), and offers high hardness and vapour temperature. The long term operation envisioned within MCF reactors, where a continuous nuclear fusion of the fuel is sustained within the confinement of a magnetic field, favours the use of high Z materials, such as W, to protect the plasma exposed deflectors. The reason is a lower erosion rate and a shorter ionization distance in the plasma, which favours the redeposition of the sputtered atoms, both resulting in a lower contamination of the plasma. The production of the first wall and the deflector shields using solid B4C and W materials respectively, is obviously unthinkable. However, ProTeC has developed high density coatings for both ICF and MCF nuclear fusion reactors. W coatings with less than 2% porosity have been produced for both, the Tokamac MCF reactor and its Toroid Fueler. The toroid fueler is a plasma generating device designed to accelerate particles and inject them into the centre of the operating fusion reactor in order to refuel. For the application in an ICF reactor, B4C coatings exhibiting porosity levels below 3% with a hardness above 2500 HV have been deposited directly onto Al substrate. Properties such as outgassing, resistance to erosion and shrapnel, and the influence of x-rays have been studied and showed exceptional results.
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Özkul, Canalp, Ismail Omer Yilmaz, Fethi Bensenouci, Kirill Ezhov, Mehmed Ekrem Yazaroglu e Ahmet Ergun Mengen. "Integrated Approach for Efficient Reservoir Characterization and Completion of the Silurian Unconventional Formation in Southeastern Turkey". In International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-23309-ms.
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Abstract The Silurian age Dadaş Shale in the Diyarbakır basin, SE Anatolian Basin are the most prospective unconventional reservoir in Turkey. However, the potential of this unconventional formation still remained ambiguous. Thus, sedimentological analysis on cores and cuttings, petrographic analysis on thin sections and scanning electron microscope (SEM) images, well log data interpretation, natural fracture characterization using Borehole Images (BHI) and cores are conducted to unlock the potential of Dadaş unconventional reservoir. The results revealed that the Dadaş-I member of the Dadaş formation has potential of source rock for the Paleozoic oil system and has considerable unconventional reservoir potential. Dadaş-I member is characterized and subdivided into four lithofacies L1, L2, L3, and L4 using the well logs information, supported by core data such as porosity, permeability, saturation, pyrolysis, SEM and X-Ray diffraction analysis (XRD) interpretation results. Petrophysical properties of the highlighted lithofacies reveal that L1 (High TOC & Quartz rich zone) and L3 (TOC rich zone) have the highest hydrocarbon potential whereas L4 (Carbonate rich zone) shows reasonable properties. However, hydrocarbon potential of the L2 (Lean Shale zone) is poor and not considered to be a good candidate for unconventional reservoir. Considered as the main permeability driver in unconventional reservoir, natural fractures characterization from logs and cores is performed in the four lithofacies. Borehole images results show that fracture orientations are unique in facies L4, striking parallel to an E-W major faults group whereas fractures in other facies are striking NNE-SSW, parallel to the second group of faults in the area. As the E-W faults are known to be formed first, L4 facies seems to be naturally fractured before the rest of facies, due to its higher elastic properties and brittleness. The two major fault groups are clearly defining the natural fractures orientations in the study area. However, the second faulting episode seems to have more impact on fracture intensity due to higher stress conditions. Many fractures interpreted as open fractures on image logs are in fact fully or partially infilled with calcite in cores. This inconsistency is explained by the different stress conditions near wellbore, where natural fractures can reopen locally under Hoop stresses, and far field conditions captured better in this case by coring. The fracture aperture from borehole images have been corrected after comparison with direct measurements on cores and based on high definition core photos. Overall, the petrophysical and geomechanical properties as well as fracture analysis, show that the four facies behave as distinct mechanical stratigraphy units. The integration of natural fractures and in-situ stresses shows that fractures oriented NNE-SSW with lower dips angles are more critically stressed than the rest. The post-mortem analysis of offset wells has proven that only combination of several factors, like high values of Gross Thickness, Pore Pressure, Dynamic Porosity, Total Organic Carbon (TOC), Brittleness as well as the presence of critically stressed fractures can increase the chance of success by defining the best interval to be targeted by stimulation operation, and enhance production from Dadaş shale reservoirs.
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Wong, Kaufui V., Yading Dai e Brian Paul. "Anthropogenic Heat Release Into the Environment". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89465.
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This work is intended to systematically study an inventory of the anthropogenic heat produced. This research strives to present a better estimate of the energy generated by humans and human activities, and compare this estimate to the significant energy quantity with respect to climate change. Because the Top of Atmosphere (TOA) net energy flux was found to be 0.85±0.15 W/m2 the planet is out of energy balance, as studied by the group from NASA in 2005. The Earth is estimated to gain 431 TW from this energy imbalance. This number is the significant heat quantity to consider when studying global climate change, and not the 78,300 TW, the absorbed part of the primary solar radiation reaching the Earth’s surface, as commonly cited and used at present in the literature. Based on energy supplied to the boilers (in the Rankine cycle) of at least 13 TW, body energy dissipated by 7 billion people and their domestic animals, the value of the total world anthropogenic heat production rate is 15.26 TW or 3.5% of the energy gain by the Earth. Based on world energy consumption and the energy dissipated by 7 billion people and their domestic animals, the value of the total world anthropogenic heat production rate is 19.7 TW or about 5% of the energy gain by the Earth. These numbers are significantly different from 13 TW. More importantly, the figures are 3.5 to 5% of the net energy gained by the Earth, and hence significant. The quantity is not 0.017% of the absorbed part of the main solar radiation reaching the Earth’s surface and negligible.
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Xia, X., J. Y. Mou, Y. C. Zhang, X. M. Li e Y. L. Li. "Testing and Analysis of Potential Damage Factors in Carbonate Reservoir". In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-0963.
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ABSTRACT: The pollution damage of injected water, fracturing fluid and drilling fluid in carbonate reservoir are mainly studied, however, the potential product precipitation damage have been seldom studied. Majiagou Formation in Daniudi gas field mainly has two kinds of rock samples, one with dolomite as the main component and the other with gypsum as the main component. On the one hand, through mineral composition analysis, the main composition of dolomite sample is CaCl2 and MgCl2. Then the ion concentration of acid rock reaction product solution was tested, the results show that the highest Ca2+ content and the highest Mg2+ content in the four groups are lower than the lowest solubility of Ca2+ and Mg2+, so the products will not reach supersaturated state and precipitate in the solution. On the other hand, for the rock sample dominated by gypsum, the mass of rock plate changes little after water immersion and acid solution corrosion. Then the gypsum samples were subjected to acid displacement, and the surface morphology changes of the samples were observed and the mass changes were measured. The test results showed that the dissolution amount of the samples was small. Therefore, it shows that water and acid will not react with gypsum and will not produce potential precipitation. 1. INTRODUCTION Carbonate reservoir is a part of unconventional oil and gas resources. The key technology of developing carbonate reservoir is acid fracturing. (Arthur B et al., 2010). However, the acid fracturing construction process will also bring negative effects, mainly manifested in the damage to the reservoir. At present, carbonate reservoir damage mainly studies the pollution damage of injected water, fracturing fluid and drilling fluid (Tiner R. L et al., 1974, Moore W. R et al., 1996, and Shi F et al, 2018). Under the action of high differential pressure, some fracturing fluid will leak out and enter the reservoir matrix (Reinicke A et al, 2010, and Fang W et al., 2016). Usually, this part of fracturing fluid is difficult to completely break the gel, which is easy to cause mechanical blockage of matrix pore throat and reduce reservoir permeability. In the process of fracturing fluid invasion, flowback and production, due to the carrying effect of fluid on reservoir particles, when the particles migrate to the hole roar with small radius, they will be blocked, resulting in a certain degree of damage to reservoir permeability (Gray D. H et al, 1996, Wilson M. J ,2014, Q. Zhang et al, 2014, and AlMubarak T. A, 2015).
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Valentine, James, Marc Cremer, Kevin Davis, J. J. Letcavits e Scott Vierstra. "A CFD Model Based Evaluation of Cost Effective NOx Reduction Strategies in a Roof-Fired Unit". In International Joint Power Generation Conference collocated with TurboExpo 2003. ASMEDC, 2003. http://dx.doi.org/10.1115/ijpgc2003-40185.
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To meet aggressive NOx reduction requirements, a range of NOx reduction strategies are currently available for application to pulverized coal fired furnaces. Utilities must assess the benefits and drawbacks of each viable NOx control technology to develop the best strategy for unit specific NOx control that fits within the utilities’ overall compliance plan. The installation of high capital and operating cost NOx reduction technologies, such as selective catalytic reduction, is cost prohibitive on many units. Lower cost technologies, although not capable of SCR level NOx reductions, can provide a more cost-effective approach and still achieve compliance over the fleet. This paper describes how computational fluid dynamic (CFD) modeling has been utilized by an experienced group of combustion engineers to evaluate and design cost effective NOx reduction strategies applied to a relatively unique PC fired unit, a B&W 150 MW roof-fired furnace. The unit fires bituminous coal through 10 multi-tip burners and is equipped with 10 NOx ports located below the burners. A baseline CFD model was first constructed and the predicted model results were compared with available data including NOx and CO emissions, as well as unburned carbon in fly ash. Upon completion of the baseline model, combustion alterations, including deeper staging, were evaluated. Specific burner adjustments were evaluated to allow for the deeper staging without significantly increasing unburned carbon in the fly ash, CO emissions, or near burner slagging. The CFD model was also utilized to evaluate the impact of water injection. AEP has previously utilized water injection to reduce peak combustion temperatures and thermal NOx formation rates in coal fired units for incremental NOx reductions. It is crucial that the NOx production zones in the downstream portion combustion field be identified, since these regions are most likely to produce NOx that will not be subsequently reduced prior to exiting the furnace. The CFD model was utilized to identify the most appropriate regions for water injection combined with the other combustion alterations. The results showed that NOx emissions could be reduced in this unit by approximately 37% from baseline full load emissions with no associated increase in unburned carbon in the fly ash or furnace exit CO. Burner alterations and water injection equipment based on the CFD model evaluation are currently being installed. Comparisons between the model predictions and the post retrofit performance will be provided.
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Roth, Christian, Gina Oberbossel e Philip Rudolf Von Rohr. "Nanoparticle Synthesis in a Plasma Downstream Reactor – From Plasma Parameters to Nanoparticle Properties". In 13th International Conference on Plasma Surface Engineering September 10 - 14, 2012, in Garmisch-Partenkirchen, Germany. Linköping University Electronic Press, 2013. http://dx.doi.org/10.3384/wcc2.112-115.
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In the presented study a tubular plasma reactor is investigated, which is normally used for the continuous plasma surface modification of fine-grained powders. The plasma reactor basically consists of a 1.5 m long glass tube with a gas and precursor feed unit at its top and a particle-gas separation unit at the lower end. The power is coupled inductively into the plasma via a coil which is wrapped around the reactor tube. Substrate powders normally pass the discharge tube with high velocity and are functionalized on their way through the plasma in approximately 0.1 s. Possible plasma surface functionalization processes for powders are illustrated in Figure 1.1. The wettability of powders is increased by the formation of polar groups on the surface. Films are deposited on particle surfaces to protect the substrate from harsh environments or for catalytic applications. In recent years, also a new plasma process, which increases the flowability of fine-grained powders, gained increasing attention. Nanostructured SiOx is formed in the plasma and directly deposited on the substrate particle surface. These nanoparticle structures increase the surface roughness of the substrate particles. Thus, the interparticle van der Waals forces are reduced, which leads to a major improvement of the powder flowability. This process shows promise for companies dealing with cohesive granular materials. The feasibility of this process was shown in the past, but at the same time the need for fundamental research in this field was recognized. Which ion density is required to yield in an effective surface modification? What is the thermal load of a substrate particle during the treatment? Which precursor should be used for a maximum improvement of the flowability? In order to answer such questions, we measured axial profiles of plasma parameters in this continuous reactor and studied the nanoparticle synthesis in detail. No substrate powder was fed during these investigations to facilitate probe measurements and to focus on the produced nanoparticles.Silica-like nanoparticles were produced from the four organosilicon monomers hexamethyldisiloxane (HMDSO), tetramethyldisiloxane (TMDSO), tetraethyl orthosilicate (TEOS), and tetramethyl orthosilicate (TMOS) in argon-oxygen gas mixtures. The chemical composition and morphology of the emerging particles and its production rate were studied as a function of process pressure (100 – 400 Pa), plasma power (200 – 350 W), gas velocity (5 – 16 m/s) and gas composition. Langmuir double probe and calorimetric probe measurements allowed determining the axial profiles of electron temperature, positive ion density, and energy influx along the vertical axis of this tubular reactor.