89,295 research outputs found
Het Festuca ovina-complex in Nederland. 2. F. lemanii Bast. en F. brevipila Tracey
No full textIn de Nederlandse flora’s worden de grofbladige schapengrassen met lange naalden samengevat onder Festuca cinerea Vill. Dit taxon blijkt echter een klein areaal te hebben dat beperkt is tot Zuidoost-Frankrijk. Andere namen die in de literatuur worden genoemd voor deze grofbladige schapengrassen in Nederland zijn F. guestfalica Boenn. ex Reichenb., F. ovina L. subsp. ophioliticola (Kerguélen) M.J. Wilkinson, F. lemanii Bast. en F. brevipila Tracey. Onderzoek aan herbariummateriaal (Nationaal Herbarium Nederland te Leiden (L), Natuurmuseum Nijmegen en het herbarium van de auteur) toonde aan dat F. lemanii en F. brevipila in Nederland te onderscheiden zijn. Ook F. psammophila en F. glauca werden in het materiaal aangetoond; het betreft geïntroduceerde soorten. Het onderscheid tussen F. brevipila en F. lemanii wordt besproken en toegelicht met een figuur. Wellicht dat ook F. guestfalica in Nederland onderscheiden kan worden, maar hiervoor is meer onderzoek nodig aan de overige taxa van het F. ovina-complex.
In the Dutch Floras, Festuca cinerea Vill. encompasses the relatively broad-leaved taxa of the Festuca ovina-complex with long awned lemmas. However, as was shown by Paul Auquier, the real F. cinerea is a species from south-eastern France. Other names which are mentioned in the literature for these broad-leaved sheep-fescues in the Netherlands are F. guestfalica Boenn. ex Reichenb., F. ovina L subsp. ophioliticola (Kerguélen) M.J. Wilkinson, F. lemanii Bast. and F. brevipila Tracey.
A morphometrical study revealed the real identity of the Dutch F. cinerea in the collections of the Nationaal Herbarium Nederland at Leiden (L), the herbarium of the Natuurmuseum at Nijmegen and the authors herbarium. From this study, the occurence of F. lemanii Bast. and F. brevipila Tracey could be ascertained. Beside this, also F. psammophila and F. glauca appeared to have been found once, probably as a result of human introduction. An overview of the characteristics of the first two species is given. Some of the studied specimens show a close resemblance to F. guestfalica; however, the true identity of these individuals can only be revealed after a thorough study of the other members of the F. ovina-group (F. ovina and F. filiformis). Festuca brevipila is very common, especially along roadsides and other antropogenous sites, where it has been sown.
It remains unclear whether this taxon originally belonged to the Dutch flora. Festuca lemanii is a rather rare taxon wich can be found in dry grasslands (Sedo-Cerastion) along the river system of the Meuse and Rhine Rivers
Era of bast fibers-based polymer composites for replacement of man-made fibers
No full textBast fibers are defined as those obtained from the outer cell layers of the bast of various plant families. They are finding use in textile applications and are widely used as reinforcements for green composites, as bast fibers are perceived as “sustainable”. There is a growing demand for bast fibers across the world due to their renewable and biodegradable nature. The bast fibers are mainly composed of cellulose, which potentially considers the growing techniques, harvesting and extraction processes of bast fibers most used to produce fibers with appropriate quality to apply in the daily lives of modern men and women in contemporary society. This review paper looks at many aspects of natural fibers, with a focus on plant bast fibers, including their impact on prehistoric and historical society. This review shows that bast fibers are competitive compared to man-made fibers in many applications, but variability in mechanical properties and low tenacity may limit their use in high-strengthh composites and extend to, particularly in aerospace, automotive, packaging, building industries, insulation, E-composites (Eco composites), geotextiles and many other applications are currently being explored. Considering, important characteristics of bast fibers include physical, mechanical, and chemical properties. This makes bast fibers one of the most important classes of plant fibers to use as reinforcing agents in thermosetting/thermoplastic polymer matrices. And the effect of bast fibers as reinforcement in the properties of ECO-composites, GREEN-composites, BIO-composites, lightweight composites. Bast fibers play an important role in sustainability, the preservation of the health of the environment, the well-being of the next generation, and even the daily lives of men and women in the contemporary world
ACM Transactions on Information Systems : Vol. 32, No. 2, April 2014
No full text1. Efficient Index-Based Snippet Generation / H. Bast, M. Celikik
2. Modelling Term Associations for Probabilistic Information Retrieval / J. Zhao, J.X. Huang, Z. Ye
3. Social-Sensed Image Search / P. Cui, et al.
4. Theoritical, Qualitative and Quantitative Analyses of Small-Document Approaches to Resources Selection / I. Markov, F. Crestan
Acetabularia jalakanyakae Saini & Madhu & Kohli & Gupta & Bast 2021, Sp. Nov.
No full textAcetabularia jalakanyakae Sp. Nov. (Fig. 1) Description The main body is comprised into three regions: a basal part with a rhizoidal holdfast, a middle region with a long stalk, and the topmost upper part with an umbrella-shaped circular cap. It consists of an unbranched cylindrical stalk. Stalk length is 20 – 40 mm with a cap diameter of 5 – 13 mm. The cap is completely fused, having 40 – 60 cap rays. The outer end of each ray forms a pointed structure. The outer ring (Corona inferior) consists of slender lobes with bifurcation. The inner ring (Corona superior) has 40 – 60 lobes without bifurcations. The inner ring comprised of 6 or 7 hairs per lobe and shows protrusions inside. The developing cap shows a swollen lobe inside and early partition at inner and outer rings. Holotype Collected from intertidal rocks at Port Blair, Andaman and Nicobar Islands, India. Herbarium voucher is deposited at Agharkar Research Institute, Pune, India, (Index Herbarium code: AHMA), under voucher no. AHMA - 32437. The DNA sequence of 18S rDNA partial region of the isolate generated and deposited at GenBank under accession # MT371394. Isotype Isotype deposited at the Central University of Punjab, Bathinda (Index Herbarium code: CUPB), under voucher no. CUPB-ACT-2019-1. Etymology Specific epithet which is feminine noun in genitive means ‗mermaid‘ in Sanskrit to refer the aesthesis of the cap that resembles mermaid‘s umbrella. Limitations The study analysed only a few algal samples from one site in Andaman Islands. More efforts to study the species biogeography would have added value to this report. The study did not analyse the life cycle patterns as the investigation did not involve any algal culturing. As life cycle and ontogeny are highly informative, this would have significantly improved the manuscript. Additionally, the length of generated sequence is only 234 bp and all four mismatches with the closest hit (A. dentata) were all ambiguities (N or R). However, strength of morphological synapomorphies stands valid for the description of new species.Published as part of Saini, K C, Madhu, A, Kohli, R K, Gupta, K & Bast, F, 2021, Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India, pp. 701-708 in Indian Journal of Geo Marine Sciences 50 (9) on pages 706-707, DOI: 10.5281/zenodo.634408
Acetabularia jalakanyakae Saini & Madhu & Kohli & Gupta & Bast 2021, Sp. Nov.
No full textAcetabularia jalakanyakae Sp. Nov. (Fig. 1) Description The main body is comprised into three regions: a basal part with a rhizoidal holdfast, a middle region with a long stalk, and the topmost upper part with an umbrella-shaped circular cap. It consists of an unbranched cylindrical stalk. Stalk length is 20 – 40 mm with a cap diameter of 5 – 13 mm. The cap is completely fused, having 40 – 60 cap rays. The outer end of each ray forms a pointed structure. The outer ring (Corona inferior) consists of slender lobes with bifurcation. The inner ring (Corona superior) has 40 – 60 lobes without bifurcations. The inner ring comprised of 6 or 7 hairs per lobe and shows protrusions inside. The developing cap shows a swollen lobe inside and early partition at inner and outer rings. Holotype Collected from intertidal rocks at Port Blair, Andaman and Nicobar Islands, India. Herbarium voucher is deposited at Agharkar Research Institute, Pune, India, (Index Herbarium code: AHMA), under voucher no. AHMA - 32437. The DNA sequence of 18S rDNA partial region of the isolate generated and deposited at GenBank under accession # MT371394. Isotype Isotype deposited at the Central University of Punjab, Bathinda (Index Herbarium code: CUPB), under voucher no. CUPB-ACT-2019-1. Etymology Specific epithet which is feminine noun in genitive means ‗mermaid‘ in Sanskrit to refer the aesthesis of the cap that resembles mermaid‘s umbrella. Limitations The study analysed only a few algal samples from one site in Andaman Islands. More efforts to study the species biogeography would have added value to this report. The study did not analyse the life cycle patterns as the investigation did not involve any algal culturing. As life cycle and ontogeny are highly informative, this would have significantly improved the manuscript. Additionally, the length of generated sequence is only 234 bp and all four mismatches with the closest hit (A. dentata) were all ambiguities (N or R). However, strength of morphological synapomorphies stands valid for the description of new species.Published as part of Saini, K C, Madhu, A, Kohli, R K, Gupta, K & Bast, F, 2021, Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India, pp. 701-708 in Indian Journal of Geo Marine Sciences 50 (9) on pages 706-707, DOI: 10.5281/zenodo.634408
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Extraction of Tannic Acid from Kenaf Bast Fibre using Ultrasonic Assisted Extraction
No full textTannic acid or tannin, type of phenolic compound contains in kenaf bast fibre. Conventional extraction has certain limitations in terms of time, energy, and solvent consumption. Ultrasound assisted extraction (UAE) can extract bioactive components in shorter time, low temperature, with lesser energy and solvent requirement. UAE as alternative extraction technique is better equipped to retain the functionality of the bioactive compounds. In this study, the conditions for ultrasound assisted extraction (UAE) of tannic acid from kenaf bast fibre by assessing the effect of sonication time and different duty cycles were optimized. The use of ultrasound to extract tannic acid from kenaf bast fiber was evaluated. Ultrasound-assisted extraction (UAE) was carried out using ethanol as solvent to intensify the extraction efficacy. Phytochemical screening was conducted to identify the presence of tannic acid in extracts. The extracts then were analyzed using High-Performance Liquid Chromatography (HPLC) and Scanning Electron Microscopy (SEM). It was found that 0.2429 mg/mL of tannic acid was obtained under the extraction conditions of extraction temperature of 40℃, sonication time of 20 minutes and duty cycle of 50%. From SEM analysis, it was found that the raw sample demonstrated rough surface and no porous but kenaf bast fibre display smoother surface with less impurities and few pores appeared after the extraction process using UAE. These results indicate that ultrasound-assisted extraction is an efficient method for extracting tannic acid from kenaf bast fibre with the advantages of lower extraction time and higher extraction yield
KENAF BAST FOR FIBER REINFORCED POLYMER COMPOSITES
No full textCellulosic fibers sized from the macro-scale to the nano-scale were prepared hierarchically from kenaf bast fibers using chemicals. The process began with a hermetical alkaline retting followed by a bleaching treatment. The bleached fibers were hydrolyzed using inorganic acid, from which microfibers and cellulose nanowhiskers (CNWs) were fabricated. Inorganic nanoparticle impregnation (INI) was used to treat the retted fibers for the improvement of the interfacial compatibility between the fiber and polypropylene (PP) matrix. The retted fibers and INI-treated fibers were used as reinforcement for the PP polymer composites. Film casting process was used to make CNW/PVA composites. The hermetical retting process used in this study produced fibers with high cellulose contents (81-92%) by removing the lignin and hemicelluloses. Higher retting temperature resulted in higher fiber surface hardness and elastic moduli. The tensile strengths and tensile moduli of the fibers decreased as the temperature increased. The SEM images showed the micropores in the cell wall structure for the fibers retted at over 130°C, providing the possibility to anchor nanoparticles into the cell wall. Surface morphology of the INI-treated fibers was examined with SEM, and showed that the CaCO3 nanoparticle crystals grew onto the fiber surface. Energy-dispersive X-ray spectroscopy (EDS) was used to verify the CaCO3 particle deposits on the fiber surface. As the size scale of the fibers decreased, the fiber crystallinity increased from 49.9% (retted fibers) to 83.9% (CNWs). About 23% á-cellulose in the raw kenaf bast fibers had been converted into CNWs. The retted fibers without INI treatment had poor compatibility with the polypropylene matrix. The INI treatment improved the compatibility between the fibers and the PP matrix, resulting in an improvement in kenaf fiber/PP composite tensile moduli and tensile strengths. The CNWs prepared from kenaf bast fiber gave excellent reinforcement for PVA composites. A nine percent increase of CNWs in the CNW/PVA composites yielded significant improvements in tensile strength and modulus of about 46% and 152%, respectively, compared with pure PVA
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
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