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Artykuły w czasopismach na temat "Cedar resin"
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Ramzy, Hamed, Kazzi Yolla, and Awada Houssein. "Phenolic Foam Reinforced by Cedar's Resin." Chemical Science International Journal 19, no. 1 (2017): 1–6. https://doi.org/10.9734/CSIJ/2017/33377.
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Recently phenolic foams have been received much attention because of their excellent properties including flame resistance, low density, high thermal stability over a broad temperature range and low generation of toxic gases during combustion. Cedar resin was used as a toughening agent to modify the brittleness of phenolic foam. The cedar resin was first introduced to the phenol formaldehyde resin. The mixture was successfully used to prepare phenolic foam using appropriate combinations of flowing agent. Benzene Sulfonic acid was employed as a curing agent. Orthophosphoric acid and nonionic surfactant polyoxyethylene were used as foaming agent and surfactant respectively. The mechanical properties results showed that the incorporation of cedar resin into phenolic foam dramatically improved the compressive strength indicating the excellent toughening effect of cedar resin. In addition this property is depended to the percentage of the cedar resin. The apparent density data indicated that the addition of cedar resin can increase the apparent density of phenolic foam.
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De Moraes Gomes Pereira, Maria Aparecida, Maria José Alves de Oliveira, Larissa Otubo, Vagner Fernandes, and Pablo Antônio Salvador Vasquez. "Restoration of culturally significant wooden artifacts using gamma radiation curable polyester resins." Brazilian Journal of Radiation Sciences 12, no. 4A (Suppl.) (2025): e2653. https://doi.org/10.15392/2319-0612.2024.2653.
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The preservation of cultural artifacts, particularly those made of wood, is a significant concern for conservators due to their susceptibility to damage from xylophagous organisms, fungi, and bacteria. This study investigates the use of gamma radiation to cure polymeric resins for the consolidation of three wood species: cedar (Cedrela spp.), canafistula (Peltophorum dubium), and ivorywood (Balfourodendron riedelianum). Various resins, including polyester LP 8847® combined with styrene, were subjected to gamma radiation to induce cross-linking without the need for catalysts. The results demonstrated that gamma radiation effectively cured the resin, filling wood pores and enhancing structural integrity. The analysis of apparent density showed that cedar, canafistula, and ivorywood exhibit different absorption capacities, with cedar absorbing the most resin and canafistula the least. Optical and Scanning Electron Microscopy confirmed the efficient penetration of resin into the wood samples, indicating that gamma radiation can be a viable technique for wood consolidation and protection against degrading agents
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Messier, Christian, and James P. Kimmins. "Growth of western red cedar seedlings in relation to microtopography, forest floor nutrient status, and fireweed and salal on clear-cut sites in coastal British Columbia." Canadian Journal of Forest Research 22, no. 3 (1992): 273–78. http://dx.doi.org/10.1139/x92-036.
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The growth of western red cedar (Thujaplicata Donn) seedlings was studied in relation to microtopography, to forest floor nutrient status, and to fireweed (Epilobiumangustifolium L.) and salal (Gaultheriashallon Pursh) abundance on 4-year-old logged and burned sites dominated by salal on northern Vancouver Island, British Columbia. These relationships were sought to determine some possible factors at the microsite level that influence the growth of western red cedar on recently clear-cut sites. Western red cedar growth and fireweed abundance and height were significantly greater in depressions than on flats and mounds, but these differences were not related to any major differences in forest floor pH, cellulose decomposition, total N and P, and available NH4+, NO3−, and phosphate P as measured using resin bags. The ecological significance of and possible reasons for the lack of correlation found between (i) western red cedar and fireweed growth and (ii) many measures of forest floor nutrient status are discussed.
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Tillman-Sutela, Eila, and Anneli Kauppi. "Structures restricting passage of water in the mature seeds of yellow-cedar (Chamaecyparis nootkatensis)." Canadian Journal of Botany 76, no. 8 (1998): 1458–66. http://dx.doi.org/10.1139/b98-135.
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Anatomical structures of seed surface layers and their role in impeding passage of water were studied for mature yellow-cedar (Chamaecyparis nootkatensis D. Don) seeds. The structures of the seed coat, nucellar layers, and megagametophyte of both dry and moistened, sectioned seeds were examined with a field emission scanning electron microscope. The anatomical details of resin-embedded seeds were studied by light or fluorescence microscopy using stained and unstained sections. The permeability of the structures exterior to the megagametophyte was analyzed by placing seeds in a Methylene Blue solution and examining them under a stereomicroscope. Results proved that the seed coat proper had only a minor effect on restricting passage of water. Penetration of staining solution was efficiently directed by the wing and epicuticular wax layer covering it, and by the large, impermeable nucellar cap. These structures, typical for yellow-cedar, essentially differed from those studied in Picea and Pinus seeds. Still, the most effective barrier to the penetration of water was in the junction formed by the megaspore membranes and the strong cuticle of the megagametophyte. These structures together with the phenolic nucellar tissues probably contribute to physiological dormancy in yellow-cedar seeds. Consequently, studies of the localization of dormancy should be focused on these layers rather than on the seed coat.Key words: conifer, seed coat, anatomy, scanning electron microscopy, imbibition.
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Ono, Kenta, Osamu Tanaike, Ryo Ishii, et al. "Solvent-Free Fabrication of an Elastomeric Epoxy Resin Using Glycol Lignin from Japanese Cedar." ACS Omega 4, no. 17 (2019): 17251–56. http://dx.doi.org/10.1021/acsomega.9b01884.
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Bhardwaj, Vibha. "Deodar Cedar (Cedrus Deodara): Efficacy for Potential of Secondary Metabolites and Antibacterial Activity." Biomedical Research and Clinical Reviews 6, no. 5 (2022): 01–09. http://dx.doi.org/10.31579/2692-9406/111.
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The setback of microbial resistance is growing and the use of antimicrobial drugs in the future is still uncertain. Infectious diseases are accountable for millions of global deaths annually. Therefore, necessary steps need to be taken to reduce this problem. In the present study, crude extracts of leaves, bark and resins of Cedrus deodara in methanol was investigated for secondary metabolites (flavonoids, glycosides, phenols, saponins, tannins, terpenoids) and antibacterial effect of Cedrus deodara was evaluated on multidrug resistant (MDR) strains of Bacillus subtilis (ATCC 6633), E. coli (ATCC 8739), Salmonella enterica (ATCC 14028), Staphylococcus aureus (ATCC 6538), Pseudomonas aeruginosa (ATCC 27853) by agar well diffusion method. Ciprofloxacin was used as standard. The methanolic extracts of leaves of C. deodara tested positive for glycosides, flavonoids, phenol, tannins and terpenoids. The Bark was tested positive for glycosides, flavonoids, phenol, tannins but resins was tested positive for terpenoids. Leaves of C. deodara showed zone of inhibition with all the five strains of microorganisms, which were used. C. deodara resin methanolic extract showed maximum zone of inhibition with Bacillus subtilis which are 25 ± 0.1 mm and bark showed maximum zone of inhibition with Staphylococcus aureus 21 ± 0.6 mm. The potency shown by these extracts recommends their use against multidrug resistant microorganisms. Time-kill curve showed a fast and sharp antimicrobial activity. Based on the research experiments, it was identified, that the methanol extract of Cedrus deodara exhibited quite high antimicrobial activity as well as secondary metabolites and this quality together with lots of other values must be considered in green landscape planning of contemporary urban environment and for the other purposes too.
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Lee, Yun-Yun, Wen-Jau Lee, Ling-Ying Hsu, and Han-Min Hsieh. "Properties of molding plates made with various matrices impregnated with PF and liquefied wood-based PF resins." Holzforschung 68, no. 1 (2014): 37–43. http://dx.doi.org/10.1515/hf-2013-0029.
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Abstract Phenol (P) and phenol-liquefied wood (LW; Cryptomeria japonica, Japanese cedar) have been reacted with formalin and ammonium hydroxide as a catalyst to prepare alcohol-soluble phenol-formaldehyde (PF) resins named PF and LWPF, respectively. The resins prepared were dehydrated, diluted with ethanol, and impregnated into wood powders, filter papers, and cloths. The PF resin-impregnated matrix materials were then hot-pressed to form molding plates (MP) and their properties were tested. Differential scanning calorimetric (DSC) analysis shows that both PF and LWPF behave as hot-melting resins and are able to further condensation reactions to form a set resin. However, the maximal temperatures of LWPF are shifted to a higher temperature range compared with PF. MPs made with LWPF-impregnated materials have poorer performance than that of PF. However, the bending strength of MP with filter paper is 96.8 MPa, which fits the request of CNS 10559. The MPs made of filter papers have the best mechanical properties followed by MPs with wood powders and cloths.
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KURIMOTO, Yasuji, Hidefumi YAMAUCHI, Takanobu SASAKI, and Satoru KANETAKA. "PRODUCTION AND APPLICATION OF WOOD-POLYURETHANE RESIN COMPOSITES USING STUBS AND ROOTS OF JAPANESE CEDAR." ENVIRONMENTAL SYSTEMS RESEARCH 34 (2006): 585–90. http://dx.doi.org/10.2208/proer.34.585.
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Jia, Chong, Yang Zhang, Juqing Cui, and Lu Gan. "The Antibacterial Properties and Safety of a Nanoparticle-Coated Parquet Floor." Coatings 9, no. 6 (2019): 403. http://dx.doi.org/10.3390/coatings9060403.
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Floor antibacterial technology prevents the human body from cross-infection with bacterial diseases. The most commonly used approach to endow daily-used floors with antibacterial properties is to apply a thin film of antibacterial agents on the parquet floor surface. In the present study, five commercial antibacterial nanoparticles were first dispersed in melamine resin solution, and then applied on a floor. Afterwards, the antibacterial properties of the nanoparticle-coated floor were investigated, in which Escherichia coli was used as the target bacteria. The impact of the nanoparticle dispersing agents on the ultimate antibacterial properties of the floor were also investigated. The results showed that silver nanoparticle-loaded hydroxyl zirconium sodium phosphate (Ag-HZDP) was most suitable as the antibacterial agent of a melamine coating for parquet flooring. With the help of sodium hexametaphosphate, the antibacterial agent was able to disperse well in the melamine resin solution and was also able to disperse well on the floor surface. When the loading amount of Ag-HZDP was 1 wt % or higher, the prepared antibacterial floor was able kill almost all the bacteria cultivated on its surface. Moreover, the prepared antibacterial floor had a lower toxicity compared with a pristine cedar substrate. The present study provides an effective way to provide daily-used parquet floors with excellent antibacterial properties.
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B, Purevsuren, Davaajav Ya, Batbileg S, et al. "Investigation on pyrolysis of some organic raw materials." Mongolian Journal of Chemistry 17, no. 43 (2017): 5–13. http://dx.doi.org/10.5564/mjc.v17i43.739.
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We have been working on pyrolysis of some organic raw materials including different rank coals, oil shale, wood waste, animal bone, cedar shell, polypropylene waste, milk casein and characterization of obtained hard residue, tar and pyrolytic water and gas after pyrolysis. The technical characteristics of these organic raw materials have been determined and the thermal stability characteristics such as thermal stability indices (T5% and T25%) determined by using thermogravimetric analysis. The pyrolysis experiments were performed at different heating temperatures and the yields of hard residue, tar, pyrolysis water and gaseous products were determined and discussed. The main technical characteristics of hard residue of organic raw materials after pyrolysis have been determined and the adsorption ability of pyrolysis hard residue and its activated carbon of organic raw materials also determined. The pyrolysis tars of organic raw materials were distilled in air condition and determined the yields of obtained light, middle and heavy fractions and bitumen like residue with different boiling temperature. This is the first time to investigate the curing ability of pyrolysis tars of organic raw materials for epoxy resin and the results of these experiments showed that only tar of milk casein has the highest (95.0%), tar of animal bone has certain (18.70%) and tars of all other organic raw materials have no curing ability for epoxy resin.
Rozprawy doktorskie na temat "Cedar resin"
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Hung, Jean Jean, and 洪禎禎. "Effects of Resin Contents and Carbonization Conditions on The Basic Properties and Toxic Gas Absorbability of WoodCeramics Made From Japanese Cedar." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/56190516034368583216.
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碩士<br>國立臺灣大學<br>森林學研究所<br>91<br>The purpose of this study was to investigate the manufacture of Japanese cedar . First, we soaked the materials with various PF concentration to make resin content of the materials 54.9%，62.0%，86.7%，90.5% and 92.1% separately. Then the materials were carbonized under various conditions that carbonization temperature increased from 300℃ to 1100℃ with every 100℃ an interval and the rates of temperature raising was 1℃/min，2℃/min，5℃/min differently. The basic properties of carbon yields，shrinkage rate，soft-x-ray irradiance，electrical resistivity，element yields and specific surface area of carbonized materials were also investigated in the research.
Furthermore, environmental such usage absorption ability for the free formaldehyde and toxic gas by carbonized materials has also been studied. Finally, the goal of this research was the new usage functions of recycle materials.
The results of this research are that the carbon yields of carbonized materials are decreasing with when the increasing carbonization temperature . It decreased rapidly when the temperature was between 300~600℃. The shrinkage rate of carbonized materials increased with increasing carbonization temperature. It became stable when the temperature was higher above 800℃. The shrinkage rate of carbonized materials were 3~23% and 12~30% for parallel to surface direction and for vertical to thickness direction respectively.
The X-ray peak irradiation of carbonized materials approximately occurred at 18。. The peak of carbon approached to 24。 when the carbonization temperature increased. The element carbon yields approximately was 84% when the carbonization temperature was higher above 900℃. The most suitable temperature of carbonization of free formaldehyde absorption ability was 800℃ in Japanese cedar woodceramics. Under this condition, it can effectively reduce formaldehyde consistency 11.31%. The secondary was at 1000℃and the absorbility also get above 10%. Others were not so good and the absorbility of them were under 10%.
The carbonization material at carbonization temperature of 500℃ had the best absorption ability of toxic gas NH3. However, the effect of the rate of temperature rise and resin contents showed in the experiment had no significant impact. The carbonization material at carbonization temperature of 1100℃had the better absorption ability of toxic gas SO2.
Części książek na temat "Cedar resin"
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Valle, Julio del. "Su cuerpo caía como la lluvia : una aproximación estética al encuentro entre culturas a partir de la lectura de El ritual de la serpiente de Aby Warburg." In Postsecularización: nuevos escenarios del encuentro entre culturas. Pontificia Universidad Católica del Perú, 2023. http://dx.doi.org/10.18800/9786123172480.009.
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El asombro es para mí el punto de partida de la filosofía. Se asombra quien se entrega, se abre, se expone. Se asombra quien está dispuesto a ceder. Quien está seguro no se asombra. Quien se coloca por encima de los demás ha perdido todo asombro; le queda solo la pulsión incierta de su caprichosa voluntad. El ser humano debe preocuparse por recuperar el sentido del asombro; debe volver a aprender a tomar distancia de sí mismo. Debe entregarse más. ¿Es una época postsecular un momento propicio para tal asombro, para tal entrega? ¿Estamos en una época postsecular? ¿Qué significa «postsecular»? Espero que la pieza de cerámica de Carlos Runcie Tanaka, que se eligió para el afiche del evento, no implique alguna respuesta anticipada de los organizadores. La pieza se titula Masa informe (2003- 2006, imagen 1). A una estructura circular geometrizante se le ha pegado una especie de resina invasiva y amorfa. La metáfora es clara.
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Gratzer, Walter. "The last of the true amateurs." In Eurekas and euphorias. Oxford University PressNew York, NY, 2002. http://dx.doi.org/10.1093/oso/9780192804037.003.0153.
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Abstract Science, and especially physics, has become too specialized and too expensive to shelter amateurs. The de Broglie brothers, Louis (who first gave expression to the particle-wave duality [113]), and especially his elder brother, the due Maurice de Broglie, were among the last. Louis-Cesar-Victor-Maurice de Broglie (1875-1960) was born into an ancient and illustrious French family; the diplomatic corps and the army were the only careers thought fitting for the scion of such a noble line, and it was only after delicate negotiations with his grandfather, the head of the clan, that he was per mitted to enter the navy. Posted to the Mediterranean fleet, his scientific bent soon asserted itself: it was Maurice de Broglie who installed the first shipboard wireless on a French warship. But he became restless at the limited opportunities for indulging his interests and asked leave to resign from the navy and devote himself to science. The grandfather was scandalized: science was an amusement for old men and not an occupation for a de Broglie. But, after pleading his case, it was agreed that the young Maurice might convert a room in the family hôtel in Paris into a laboratory in which to amuse himself when not at sea. It was only after the patriarch’s death that Maurice, then 33, finally felt able to resign his commission (although he returned to work on submarine communications for the duration of the First world War). He then studied spectroscopy at the College de France and completed a thesis under a distinguished physicist, Paul Langevin, with whom he had worked on the submarine project. Thereafter Maurice de Broglie withdrew to his superbly equipped private laboratory, where he was joined by a succession of assistants, including his brother, Louis, who later won a Nobel prize. The Swiss crystallographer, P. P. Ewald, told in a lecture in 1953 that:
Streszczenia konferencji na temat "Cedar resin"
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Medvedev, Il'ya, Dmitriy Parinov, and Vladimir Shamaev. "CONTINUOUS IMPREGNATION OF WOOD FROM THE END FACE UNDER PRESSURE WITH VARIOUS COMPOSITIONS." In Modern machines, equipment and IT solutions for industrial complex: theory and practice. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2021. http://dx.doi.org/10.34220/mmeitsic2021_245-249.
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Modern impregnating compositions for wood can significantly improve its characteristics. Water-soluble and oily antiseptics, flame retardants, strengthening and plasticizing modifiers, and dyes are used as impregnating compositions. By means of impregnation, substances are introduced into the wood that increase its characteristics such as plasticity, hydrophobicity, bio- fire resistance and shape stability. But, the indicator of certain properties after impregnation of wood with a certain composition depends on the depth of impregnation, on the uniformity of the distribution of the impregnating composition over the entire volume of wood, on the concentration of the impregnating composition in the wood, on the chosen method of impregnation. It also affects which group of impregnability a particular wood belongs to, according to the breed composition, the division is made into 3 groups: 1-easily nourished rocks (birch, alder, beech, aspen sapwood, poplar, pine); 2-moderately impregnated rocks (cedar, oak, ash, maple, linden, pine core); 3-hard- to-impregnate rocks (spruce, larch, fir). Spruce and larch are considered to be almost impervious to deep impregnation of the rocks, because of their clogged pores with resin. In the autoclave method of impregnation with water solutions, the wood must be dried to a humidity of 40% before impregnation, and to a humidity of 30% when impregnated with oily liquids. After impregnation, a re-drying operation follows. Another significant disadvantage of autoclave impregnation is its uneven distribution of the absorbed liquid in the workpieces, in some workpieces too much impregnating liquid penetrates, and in others not enough. In order to avoid two dries and to be able to set the volume of liquid that the wood will absorb, as well as to ensure the uniformity of impregnation over the entire volume of wood, it is proposed to develop a technology and equipment for end-to-end impregnation of coniferous wood from the end under pressure of raw, rounded logs with a diameter of 15-35 cm and a length of 3 m.