1,340 research outputs found
Estimation of seed production by Myosotis arvensis, Veronica hederifolia and Viola arvensis under different competitive conditions
No full textSeed production by Myosotis arvensis, Viola arvensis, Veronica persica and Veronica hederifolia was estimated in a series of 12 experiments. These species were grown in the field either on their own or in competition with a range of arable crops, though mainly winter wheat. Plants were harvested in summer, as they approached maturity and capsule and flower head numbers and dry weights were recorded. Seeds produced by each capsule (flower head) were also assessed in all experiments. Seed numbers were regressed with plant weight on a log/log basis, and high correlations were achieved in all cases (percentage variance accounted for > 91%). Slopes of the overall regression lines were slightly < 1.0 for all species (0.77-0.92). In the absence of crop competition, M. arvensis was estimated to produce c. 100 000, V. arvensis 3714, V. persica 4100 and V. hederifolia 980 seeds per plant. Competition from winter wheat reduced seed production of three of the species by more than 70%, but only reduced V. hederifolia production by 56%. These data on seed production form a key building block for the construction of population dynamics models to predict the likely consequences of the lower input weed management that is being promoted to reduce the environmental impact of weed control
The Edmonton Latvian Society Imanta
No full textScrapbook page: Includes a B&W photo of Ted & Viola Baker, descriptive history of Imanta in Alberta, Imanta's Mission and Purpose [1947], Updated Imanta Constitution of 2003, Goda Karte (Ted Baker Honourary and Lifetime member of Imanta)1.0 Imanta, 1.1.1 History of Imant
The viola, its foundation, role, and literature including an analysis of the twelve caprices by Lillian Fuchs
No full textDiscussion in this document is directed toward two main areas: Chapters two, three, and four are concerned with the development of the viola as a serious musical instrument in the orchestral, chamber, and solo genres. The history of the instrument is presented on a parallel track with that of the violin, showing how the viola is similar to, and differs from the violin, with respect to the size and most importantly, playing technique. An attempt is made to show that historically there has been a lack of understanding on the part of most pedagogues concerning the subtle differences in performance technique between violin and viola. This is accomplished by a comparison of methods and studies for both instruments from the Harmonie Universelle of Mersenne through the development of the French School, including Kreutzer, Rode, Gavinies, and others. Such comparison leads the author to state that there is little which actually acknowledges the differences between playing violin and viola.The author states that the main problems between the two instruments are mostly a matter of degree with regard to such techniques as extension, shifting, finger percussion, double-stop articulations, and bowing. Such discussion leads to the conclusion that there is a need for technical studies which will provide for this above-stated degree of difference, and put the "finishing touches" on the violist's playing technique.It is the opinion of this author that such technical studies are embodied in the form of Twelve Caprices for Viola by Lillian Fuchs. These caprices were written by Miss Fuchs to help her overcome performance problems with which she was faced.Part two of this dissertation is an analysis of the Twelve Caprices. In preparing this analysis the author approached the principal problems of each hand and addressed himself to the methods for surmounting each separate problem. Each caprice is methodically analyzed in some detail, avoiding redundancy by discussing only new techniques as they occur, and not restating problems which are the same in more than one caprice.Thesis (D.A.
Imanta
No full textImanta is a cultural support organization formed on March 8, 1947 in Edmonton, Alberta. Imanta was founded by Ted Baker and Latvian people previously established in Alberta. Ted Baker's wife Viola Baker, also supported Ted's belief in the value of a formal organization that would serve as a contact point for new Latvian immigrants. Imanta originally helped immigrants connect with other Latvians and settle in the province. Imanta has continued to remain a vital cultural part of Latvian society in Alberta. The Edmonton Latvian Society "Imanta" meets regularly, through many social and cultural gatherings and formal events. The Imanta resource network remains a vital part of Latvian society in Alberta today.Imanta 1.
Mosses on Geopolymers: Preliminary Durability Study and Chemical Characterization of Metakaolin-Based Geopolymers Filled with Wood Ash
No full textBurning wood is estimated to produce about 6–10% of ash. Despite the possibility of recycling wood ash (WA), approximately 70% of the wood ash generated is landfilled, causing costs as well as environmental pollution. This study aims to recycle WA in an alternative way by inserting it as filler in geopolymeric materials. Here, metakaolin, NaOH, sodium silicate, and WA are used to realize geopolymers. Geopolymers without and with 10, 20 and 30% of WA are synthesized and characterized after 7, 14, 28 and 56 days. The article’s study methods are related to geopolymers’ chemical, biological and mechanical properties. The geopolymers synthesized are compact and solid. The pH and conductivity tests and the integrity and weight loss tests have demonstrated the stability of materials. The FT-IR study and boiling water test have confirmed the successful geopolymerization in all samples. The antibacterial analysis, the moss growing test and the compressive strength test have given a first idea about the durability of the materials synthesized. Furthermore, the compressive strength test result has allowed the comparison from the literature of the specimens obtained with the Portland cement (PC). The results obtained bode well for the future of this material
Filling Fresh Metakaolin‐Based Geopolymer Paste with Wood Ash: Chemical and Mechanical Characterization
No full textThe significance of selected compositions by Ralph Vaughan Williams which feature the viola
No full textThe main body of this document includes discussion of the background, analysis, and significance of eight compositions by Ralph Vaughan Williams which feature the viola. These works were selected from those which give the viola unusual prominence. Solo works include Flos Campi, Suite for viola and small orchestra, and Romance for viola and piano. Two transcriptions for viola and piano, Six Studies in English Folk Song and Fantasia on Greensleeves, are also discussed. The remaining works are Four Hymns for tenor, string orchestra or piano, and viola obbligato, the String Quartet in A Minor in which the viola leads, and the Phantasy Ouintet which uses two violas and evolves from a viola melody.Chapters two through eight discuss each work. Chapters two through four cover Flos Campi, the Suite, and the quartet. Chapter two includes additional sections about problems resulting from the extra-musical associations in Flos Campi and various theories as to how they are reflected in the music. The next three chapters discuss Romance, Four Hymns, and the quintet. Chapter eight discusses the transcriptions.Musical analyses were completed for each composition by the author. Theirdepth was determined by the overall importance of each work. The most detailed analyses are for Flos Campi, the Suite,and the quartet; the briefest are for the transcriptions.A section discussing pedagogical significance follows the discussion of each composition. This includes information regarding the difficulty of each work and its value as teaching material.The introductory chapter addresses Vaughan Williams' love for the viola, his partiality to it in compositions, and the problem of limited research in light of the seeming significance of this music.The conclusion reviews the significance of each composition. Flos Campi was found to be the most significant historically and musically; the Suite has the most pedagogical value. A need to study a variety of these works was discovered due to their diversity of style and value. The conclusion is followed by an appendix of the author's performance suggestions for selected passages from each composition.Thesis (D.A.)School of Musi
Metakaolin-Based Geopolymers Filled with Industrial Wastes: Improvement of Physicochemical Properties through Sustainable Waste Recycling
No full textThe increasing global demand for cement significantly impacts greenhouse gas emissions and resource consumption, necessitating sustainable alternatives. This study investigates fresh geopolymer (GP) pastes incorporating 20 wt.% of five industrial wastes—suction dust, red mud from alumina production, electro-filter dust, and extraction sludges from food supplement production and from partially stabilized industrial waste—as potential replacements for traditional cement. Consistent synthesis methods are used to prepare the geopolymers, which are characterized for their physicochemical, mechanical, and biological properties. Ionic conductivity and pH measurements together with integrity tests, thermogravimetry analysis (TGA), and leaching analysis are used to confirm the stability of the synthesized geopolymers. Fourier-transform Infrared (FT-IR) spectroscopy is used to follow geopolymerization occurrences. Results for ionic conductivity, pH, and integrity revealed that the synthesized GPs were macroscopically stable. TGA revealed that the main mass losses were ascribable to water dehydration and to water entrapped in the geopolymer networks. Only the GP filled with the powder of the red mud coming from alumina production experienced a mass loss of 23% due to a partial waste degradation. FT-IR showed a red shift in the main Si-O-(Si or Al) absorption band, indicating successful geopolymer network formations. Additionally, most of the GPs filled with the wastes exhibited higher compressive strength (37.8–58.5 MPa) compared to the control (22 MPa). Only the GP filled with the partially stabilized industrial waste had a lower mechanical strength as its structure was highly porous because of gas formation during geopolymerization reactions. Despite the high compressive strength (58.5 MPa) of the GP filled with suction dust waste, the concentration of Sb leached was 25 ppm, which limits its use. Eventually, all samples also demonstrated effective antimicrobial activity against Escherichia coli and Staphylococcus aureus due to the alkaline environment and the presence of metal cations able to react with the bacterial membranes. The findings revealed the possibility of recycling these wastes within several application fields
Giving shape to time: An investigation into mixed-media installation
No full textThis research investigates ways of shaping time and identifying the characteristics of time that evolve in my art practice with reference to a synthesis of two and three-dimensional material, sound, and video. The nature of this study is a three-way material exchange between theoretical discourses, my practice, and audience response. The theoretical discourse includes a survey of the notions of time from different fields of knowledge from science, literature, anthropology, and memory studies. Additionally, an analysis of two contemporary installations, Normal & Nature by a Thai artist, Kamin Lertchaiprasert, and Going Forth by Day by an American artist, Bill Viola, is included.
Project 1, A solo show by Toeingam Srisubut, featured three art pieces: time-scape, container site, and ... and a real TV. The first project explored the potential media that can give shape to time and make the characteristics of time explicit. My evaluation of this project focuses on analysing the characteristics of time that grow out of my three works, and examining the audience's multiple readings of time that reveal various indicators, e.g. spaces, narratives, audience's and my memories, and certain Thai social and economic elements.
In Project 2, a sound and performance installation Rush Hour, narrative, space, and audience participation are considered specifically. I am testing out how effective the three indicators can give shape to time, and identifying the different characteristics of time of the installation placed in a specific environment of Koh Samui.
Project 3, a mix-media installation, When I grow rich, say the bells of Shoreditch, re-tested the three indicators. This project demonstrates my personal, cultural engagements and interpretations of these indicators. The research identifies further areas for potential studies within various aspects of time as well as practical ways of giving shape to it
Assessing the carbonation potential of wood ash for CO2 sequestration
No full textAbstract
Wood ash, a byproduct of wood combustion, poses environmental challenges when disposed of in landfills. This study explores a sustainable alternative by investigating the carbonation of wood ash, a process converting CO2 into stable carbonate minerals. With increasing concerns about waste management, this research aims to identify optimal carbonation conditions by varying relative humidity, liquid-to-solid ratio (L/S), and temperature. Results demonstrate that the ideal conditions for wood ash carbonation involve a moderate relative humidity of 55%, room temperature at 25 °C, and a lower L/S ratio. Thermogravimetric analysis (TGA) indicates that extended curing times increase CaCO3 formation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) confirm the presence of carbonate phases. Mechanical strength tests reveal that samples with lower porosity and higher carbonation products exhibit superior strength. This study contributes to the understanding of wood ash carbonation but also emphasizes its potential practical applications in construction materials as light aggregates in cement concrete. The research explores the implications for sustainable waste management, offering insights into environmentally and economically viable solutions for wood ash recycling.摘要
草木灰是木材燃烧的副产品，直接填埋会导致环境问题。本文提出了一种可持续的替代方案，通过调控草木灰的碳化过程，将CO 转化为稳定的碳酸盐。在废弃物处理日益受到关注的背景下，本文通过调节相对湿度、液固比(L/S)和温度，确定了最佳碳化条件。研究结果显示，草木灰碳化的理想条件是相对湿度55%、室温25℃以及较低的液固比。热重分析(TGA)表明，延长养护时间可以促进CaCO 的生成；扫描电镜(SEM)和X射线衍射(XRD)证实了碳酸盐相的存在。力学性能试验表明，孔隙率低且碳化程度高的试件具有更高的强度。本研究不仅有助于理解草木灰的碳化过程，还强调了其在制备轻质骨料等建筑材料中的应用价值，提供了一种可行的、环保且经济的草木灰回收解决方案。Abstract
Wood ash, a byproduct of wood combustion, poses environmental challenges when disposed of in landfills. This study explores a sustainable alternative by investigating the carbonation of wood ash, a process converting CO2 into stable carbonate minerals. With increasing concerns about waste management, this research aims to identify optimal carbonation conditions by varying relative humidity, liquid-to-solid ratio (L/S), and temperature. Results demonstrate that the ideal conditions for wood ash carbonation involve a moderate relative humidity of 55%, room temperature at 25 °C, and a lower L/S ratio. Thermogravimetric analysis (TGA) indicates that extended curing times increase CaCO3 formation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) confirm the presence of carbonate phases. Mechanical strength tests reveal that samples with lower porosity and higher carbonation products exhibit superior strength. This study contributes to the understanding of wood ash carbonation but also emphasizes its potential practical applications in construction materials as light aggregates in cement concrete. The research explores the implications for sustainable waste management, offering insights into environmentally and economically viable solutions for wood ash recycling.摘要
草木灰是木材燃烧的副产品，直接填埋会导致环境问题。本文提出了一种可持续的替代方案，通过调控草木灰的碳化过程，将CO 转化为稳定的碳酸盐。在废弃物处理日益受到关注的背景下，本文通过调节相对湿度、液固比(L/S)和温度，确定了最佳碳化条件。研究结果显示，草木灰碳化的理想条件是相对湿度55%、室温25℃以及较低的液固比。热重分析(TGA)表明，延长养护时间可以促进CaCO 的生成；扫描电镜(SEM)和X射线衍射(XRD)证实了碳酸盐相的存在。力学性能试验表明，孔隙率低且碳化程度高的试件具有更高的强度。本研究不仅有助于理解草木灰的碳化过程，还强调了其在制备轻质骨料等建筑材料中的应用价值，提供了一种可行的、环保且经济的草木灰回收解决方案
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