The Research on the Mechanical Property of CBF/PP Composite Board

2010 ◽  
Vol 150-151 ◽  
pp. 1063-1067
Author(s):  
Fei Fei Zhu ◽  
Zhi Li Zhong ◽  
Zong Fu Guo
Keyword(s):  
Mechanical Property ◽  
Polypropylene Fiber ◽  
Basalt Fiber ◽  
Variance Analysis ◽  
Forming Process ◽  
Composite Board ◽  
Actual Application ◽  
Wide Range ◽  
Significant Difference ◽  
The Difference

The three composite boards which were made of continuous basalt fiber (CBF) and polypropylene fiber (PP) in different fiber ratios were researched on this paper. The manufacturing forming process included blending, carding, web formation, laminating and compression molding orderly. The tension and bending properties were investigated experimentally, and then dual variance analysis was used to show the significant difference of the mechanical property in the transverse and longitudinal orientation as well the appreciable impact of different fiber ratios to the mechanical property. The results show that the difference of the tension and blending strength in the same direction, among composite boards in different fiber proportions, is about 1~10Mpa; the difference in the same fiber proportion, between transverse and longitudinal, vary within a wide range from 10Mpa to 30Mpa. The results of variance analysis have also proved the conclusion, the difference between transverse and longitudinal is more significant than the difference among different fiber proportions. In the similar study, the significance hadn’t been seen sufficiently, so this paper provides reference to the actual application of the composite board.

The Influence of Basalt Fiber Orientation on the Mechanical Property of Composite Board

2011 ◽  
Vol 194-196 ◽  
pp. 283-286
Author(s):  
Fei Fei Zhu ◽  
Zhi Li Zhong ◽  
Hua Wu Liu ◽  
Zong Fu Guo
Keyword(s):  
Mechanical Property ◽  
Fiber Orientation ◽  
Transverse Direction ◽  
Basalt Fiber ◽  
Orientation Angle ◽  
Tensile Tests ◽  
Displacement Curve ◽  
Composite Board ◽  
Bending Modulus ◽  
Actual Application

The composite board was made of chopped basalt and polypropylene fibers. The manufacturing process included blending, carding, web formation, laminating and compression molding. The tension and bending properties were investigated experimentally. The load - displacement curve of the tensile test revealed that the elastic modulus and maximum vertical load in the longitudinal were far greater than these in the transverse direction; and tensile strengths were far apart in the longitudinal and transverse direction as well. In comparison with the tensile tests, the effect of basalt fiber orientation on the bending modulus and strength were relatively insignificant. In addition, from the micro fibril angle, we also verify that the orientation angle of basalt fiber is an important factor of influence to the mechanical property. In the similar study, the influence hadn’t been seen sufficiently, so this paper provides reference to the actual application of the composite board.

Investigation of Epistemological Beliefs and Creativity Fostering Behaviours of Prospective Teachers' in Terms of Various Variables

2021 ◽  
pp. 212-226
Author(s):  
Fatma Alkan
Keyword(s):  
Data Collection ◽  
Prospective Teachers ◽  
Epistemological Beliefs ◽  
Education Programme ◽  
Variance Analysis ◽  
Epistemological Belief ◽  
Significant Difference ◽  
Belief Scale ◽  
The Difference

This study aims to investigate the prospective teachers' epistemological beliefs and creativity fostering behaviour and changes with the same according to various variables. The study was designed based on the relational survey model. The sample of the research consisted of 420 prospective teachers. For the purpose of the study, the epistemological beliefs scale and creativity fostering teacher index were used as data collection tools. The difference between the epistemological beliefs and creativity fostering teacher index sub-dimensions according to gender, programme and university variables was examined by "Multivariate Variance Analysis MANOVA". As a result of the research, the prospective teachers' epistemological belief and creativity fostering behaviour were found to be average. However, when the changes in the sub-dimensions of epistemological belief scale according to gender and university variables were examined, the effect of both variables was significant. The changes in epistemological beliefs according to the class and education programme were not significant. There was also no significant difference in sub-dimensions of creativity fostering teacher index scales according to gender and programme and class and programme.

scholarly journals Superiority of a vitamin B12-containing emollient compared to a standard emollient in the maintenance treatment of mild-to-moderate plaque psoriasis

2017 ◽  
Vol 30 (4) ◽  
pp. 439-444 ◽  
Author(s):  
Ester Del Duca ◽  
Francesca Farnetani ◽  
Nathalie De Carvalho ◽  
Ugo Bottoni ◽  
Giovanni Pellacani ◽  
...  
Keyword(s):  
Plaque Psoriasis ◽  
Severity Index ◽  
Vitamin B ◽  
Psoriasis Area Severity Index ◽  
Wide Range ◽  
Significant Difference ◽  
Therapy Option ◽  
The Difference ◽  
Time Point ◽  
Emollient Cream

Psoriasis is a chronic inflammatory skin disease affecting 2%–3% of the population. The wide range of drugs currently available for its treatment could be associated, in the long term, with organ toxicity and adverse events, thus, clinical monitoring throughout treatment is required. This investigator-initiated trial (IIT) evaluated the efficacy and the safety of a vitamin B12-containing ointment in comparison with glycerol-petrolatum-based emollient cream used twice a day to treat mild-to-moderate plaque psoriasis for a period over 12 weeks followed by a wash-out observation period of 4 weeks. This study was conducted as a randomized, controlled, single-blind, intra-patient left- to right-side trial comparing the efficacy and safety of vitamin B12-containing ointment (M-treatment) with a glycerol-petrolatum-based emollient cream (C-treatment). The Psoriasis Area Severity Index (PASI) was determined at baseline (T0), at time points T2 (14 days), T4 (4 weeks), T8 (8 weeks), T12 (12 weeks) and 4 weeks after the end of the wash-out period (F1). In total, 24 patients with plaque psoriasis were randomized to receive left- or right-side treatment with B12 ointment. From time point T2 to time point F1, there was a statistically significant difference in PASI reduction between M-treatment side and C-treatment side. At time point T 12, the difference between the mean reductions from baseline PASI scores by 5.92 ± 2.49 (87, 6%) in the M-treatment side versus 1.08 ± 1.02 (23, 1%) C-treatment side was statistically highly significant ( PWex < 0.001). On the contemporary panorama in the treatment of psoriasis, we conclude that vitamin B12 ointment will represent a new concrete therapy option and should be considered in the update of therapeutic algorithm for the treatment of psoriasis

Experimental Research on Influences on Mechanical Property of C50 Waterproof Concrete by Basalt Fiber

2013 ◽  
Vol 834-836 ◽  
pp. 755-761
Author(s):  
Hai Liang Wang ◽  
Hai Yang Guo ◽  
Xin Lei Yang ◽  
Quan Chang Ren ◽  
Peng Dong
Keyword(s):  
Mechanical Property ◽  
Experimental Research ◽  
Brittle Failure ◽  
Fracture Resistance ◽  
Test Specimen ◽  
Polypropylene Fiber ◽  
Basalt Fiber ◽  
Experimental Results ◽  
Regular Patterns ◽  
Failure Character

The experiment discussed influences of basalt fiber with different adulterate amount to the compressive and fracture resistance properties of waterproof concrete C50. We also made comparison between experimental results and mechanical property of polypropylene fiber waterproof concrete. The experimental results demonstrated that the brittle failure character of waterproof concrete has been improved to some extent, and the compressive and fracture resistance strength of the test specimen has increased apparently after adulterating basalt fiber and polypropylene fiber. Furthermore, it is mainly unanimous of the influence regular patterns of basalt fiber and polypropylene fiber to waterproof concrete when adulterating the same amount.

scholarly journals Running Performance and Hormonal, Maturity and Physical Variables in Starting and Non-Starting Elite U14 Soccer Players During a Congested Match Schedule

2021 ◽  
Vol 80 (1) ◽  
pp. 287-295
Author(s):  
Vinicius Zanetti ◽  
Marcelo Saldanha Aoki ◽  
Paul Bradley ◽  
Christopher Carling ◽  
Thomas Kisil Marino ◽  
...  
Keyword(s):  
High Speed ◽  
Soccer Players ◽  
Running Performance ◽  
Salivary Testosterone ◽  
Youth Soccer ◽  
Wide Range ◽  
Significant Difference ◽  
The Difference ◽  
Biological Maturity ◽  
Test Level

Abstract This study examined changes in match running performance (MRP) in Under-14 soccer players (13.5 ± 0.7 yrs) during a congested match schedule (CMS) (4 matches played within a 5-day period). It also examined the difference in salivary testosterone (sT) concentration, somatic maturation, jumping tests, and Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IR1) between the players selected to play (SLG; group who participated in all matches) and players non-selected to play (NSG). A significant difference was observed for the frequency of decelerations (DEC) across matches (match 4 vs. matches 1, 2 and 3; p = 0.05; partial ƞ2 = 0.20). No difference between matches was observed for total running distance (TRD), high-speed running distance (HSRD), and frequency of accelerations (ACC) (p > 0.05). A wide range for within-player coefficient of variation (CV) values was observed for all MRP variables (range: 10.5 = TRD to 30.6 = HSRD). No difference between SLG and NSG for any of the assessed variables was observed (p > 0.05). The findings suggest that DEC was the most pertinent variable for monitoring changes in MRP during the CMS. In addition, at an elite youth soccer level, the biological maturity and fitness might not influence selection to play.

scholarly journals Perbedaan kadar caffeic acid phenethyl ester pada propolis ekstrak etanol dan propolis ekstrak air

2013 ◽  
Vol 11 (2) ◽  
pp. 43-47
Author(s):  
RIANI DWI HASTUTI ◽  
DIDING PRASETYO ◽  
SRI HARTATI HADINOTO
Keyword(s):  
Caffeic Acid ◽  
Water Extract ◽  
Ethanol Extract ◽  
Caffeic Acid Phenethyl Ester ◽  
Rat Aorta ◽  
Raw Material ◽  
Wide Range ◽  
Significant Difference ◽  
Post Test ◽  
The Difference

Hastuti RD, Prasetyo D, Hadinoto SH. 2013. The difference of caffeic acid phenethyl ester level in ethanol extract propolis and water extract propolis. Biofarmasi 11: 43-47. Propolis is a natural product derived from plant resin collected by honeybeen and its composition has wide range of biological activity. CAPE is the ester of caffeic acid, a derivative of phenolic acid, a flavonoid-like compound, one of the major components of propolis. CAPE is reported can protect nephrotoxicity due to cisplatin induction, inhibiting the growth of various types of abnormal cells, having an anti-inflammation activity, antioxidant activity, cyclooxygenase activity, vasodilatation activity in rat aorta, potential inhibitor of nitric oxidant, inhibitor oxidative process, and effectively suppress the growth of cataract in rat. Propolis can not be used as raw material, and it must be purified by extraction with solvent. Different solvents may extract different compounds, influencing its activity. The purpose of this research was to determine the difference levels of CAPE in ethanol extract propolis and water extract propolis. This research was a pure experimental research using the post-test only design. The sample of this research was raw propolis taken from bees farming in Gejen RT. 03 RW. 02, Kerjo, Karanganyar. Sampling was performed by a purposive sampling. Sample was extracted with a maserasion method with the solvents of ethanol and water. In each extract propolis was made five samples. The determination of the level of CAPE on propolis was performed by using UV-Vis spectrophotometry with Prussian Blue method. The data of the level of CAPE was analyzed by the statistical test of independent t-test. The results showed that the average of CAPE level in ethanol extract propolis was 12.268±0.658 μg/mL and the average of CAPE level in water extract propolis was 5.564±0.332 μg/mL, with p=0.125 (p>0.05). There was no significant difference between extract ethanol propolis and water extract propolis.

scholarly journals Nutrient Removal by Grain in Modern Soybean Varieties

2021 ◽  
Vol 12 ◽  
Author(s):  
Michel Esper Neto ◽  
Lorena Moreira Lara ◽  
Silas Maciel de Oliveira ◽  
Rayssa Fernanda dos Santos ◽  
Alessandro Lucca Braccini ◽  
...  
Keyword(s):  
Plant Breeding ◽  
Nutrient Removal ◽  
Nutrient Management ◽  
Nutrient Use Efficiency ◽  
Field Trials ◽  
High Yield ◽  
Specific Information ◽  
Wide Range ◽  
Significant Difference ◽  
The Difference

Knowing the nutrient removal by soybean grain harvest in different varieties, locations, and over time is essential to correctly adjust agronomic recommendations, update farmers’ practices, and increase nutrient use efficiency. A field-based research trial was carried out to assess macronutrients [nitrogen (N), phosphorus (P), potassium (K), magnesium (Mg), calcium (Ca), and sulfur (S)] removed in grain by modern soybean varieties from southern Brazil introduced between 2007 and 2016. We examined changes between our set of modern varieties and a dataset of historical values encompassing a wide range of varieties introduced before 2007. Moreover, we undertook a synthesis analysis using scientific literature published after 2007 to investigate nutrient removal by grain among modern Brazilian soybeans and a dataset that included field trials from Argentina, United States, and India. There were no yield gains across the years for modern soybean varieties introduced among 2007 and 2016 in Brazil, although the grain N and Mg concentrations decreased. Modern Brazilian soybeans increased nutrient removal compared with that by soybeans historically planted in Brazil, with 11.1, 26.9, 45.0, and 31.6% more N, P, K, and Mg removed, respectively. Our results indicated that soybean growing in Brazil removed 4.3% less N relative to the values reported in the literature dataset, whereas K removal was 21.4% greater. A significant difference was also recorded for high-yield soybean varieties, and Brazilian varieties removed 11.8% less N and 8.6% more K than varieties in the literature dataset. No differences were found among locations for P removal, averaging 4.9 kg Mg–1 grain. In conclusion, this study indicates that the amounts of nutrients removed by modern soybean varieties were greater relative to the historical values recorded in Brazil, excluding Ca and S. Nonetheless, in the middle to long term (10 years), a significant impact of plant breeding on grain nutrient concentration was recorded only for N and Mg. The difference in nutrient removal patterns between Brazil and other countries indicates an integrated effect of management, genotype, and environment on nutrient removal. These findings provide guidance for optimal nutrient management and specific information for plant breeding programs to understand nutrient variability.

scholarly journals Color Appearance Shifts Depending on Surface Roughness, Illuminants, and Physical Colors

2021 ◽  
Author(s):  
Youngjoo Chae
Keyword(s):  
Surface Roughness ◽  
Three Dimensional ◽  
Color Appearance ◽  
Design Element ◽  
Reflected Light ◽  
Wide Range ◽  
Significant Difference ◽  
The Difference ◽  
True Colors ◽  
Appearance Changes

Abstract Texture is an important synesthetic design element used in textile products. The three-dimensional surface of texture changes the amount and angle of reflected light causing a color appearance change from its original color. In this work, for a wide range of colors, it was quantitatively analyzed how the color appearances change depending on different textures and illumination, such as CIE standard illuminants A, F11, F2, and D65. It was found that strong-textured fabrics (with a surface roughness Ra of 0.46 mm) had larger hue appearance changes and consequent overall color appearance changes from their true colors due to illuminants than non-textured papers (with a surface roughness Ra of 0.03 mm). Between two types of fabrics with different textures of 0.25 and 0.46 mm, however, there was no significant difference in the magnitude of color appearance changes, indicating that the difference in surface roughness greater than 0.43 mm can produce significant differences in color appearance changes induced by illumination. It was also found that the magnitude and direction of color appearance changes under different CIE illuminants differed significantly according to the physical chroma and hue of the surface.

Comparative Effects of High-Tech Visual Scene Displays and Low-Tech Isolated Picture Symbols on Engagement From Students With Multiple Disabilities

2019 ◽  
Vol 50 (4) ◽  
pp. 693-702 ◽  
Author(s):  
Christine Holyfield ◽  
Sydney Brooks ◽  
Allison Schluterman
Keyword(s):  
Language Learning ◽  
Augmentative And Alternative Communication ◽  
Visual Analysis ◽  
Multiple Disabilities ◽  
Visual Scene ◽  
Future Research ◽  
High Tech ◽  
Single Subject ◽  
Wide Range ◽  
The Difference

Purpose Augmentative and alternative communication (AAC) is an intervention approach that can promote communication and language in children with multiple disabilities who are beginning communicators. While a wide range of AAC technologies are available, little is known about the comparative effects of specific technology options. Given that engagement can be low for beginning communicators with multiple disabilities, the current study provides initial information about the comparative effects of 2 AAC technology options—high-tech visual scene displays (VSDs) and low-tech isolated picture symbols—on engagement. Method Three elementary-age beginning communicators with multiple disabilities participated. The study used a single-subject, alternating treatment design with each technology serving as a condition. Participants interacted with their school speech-language pathologists using each of the 2 technologies across 5 sessions in a block randomized order. Results According to visual analysis and nonoverlap of all pairs calculations, all 3 participants demonstrated more engagement with the high-tech VSDs than the low-tech isolated picture symbols as measured by their seconds of gaze toward each technology option. Despite the difference in engagement observed, there was no clear difference across the 2 conditions in engagement toward the communication partner or use of the AAC. Conclusions Clinicians can consider measuring engagement when evaluating AAC technology options for children with multiple disabilities and should consider evaluating high-tech VSDs as 1 technology option for them. Future research must explore the extent to which differences in engagement to particular AAC technologies result in differences in communication and language learning over time as might be expected.

Cranial crassicaudiasis in two coastal dolphin species from South Africa is predominantly a disease of immature individuals

2020 ◽  
Vol 139 ◽  
pp. 93-102 ◽  
Author(s):  
MF Van Bressem ◽  
P Duignan ◽  
JA Raga ◽  
K Van Waerebeek ◽  
N Fraijia-Fernández ◽  
...  
Keyword(s):  
South Africa ◽  
Bone Development ◽  
Bottlenose Dolphins ◽  
Fatal Outcome ◽  
Population Level ◽  
Cape Coast ◽  
Osteolytic Lesions ◽  
Immune Mediated ◽  
Significant Difference ◽  
The Difference

Crassicauda spp. (Nematoda) infest the cranial sinuses of several odontocetes, causing diagnostic trabecular osteolytic lesions. We examined skulls of 77 Indian Ocean humpback dolphins Sousa plumbea and 69 Indo-Pacific bottlenose dolphins Tursiops aduncus, caught in bather-protecting nets off KwaZulu-Natal (KZN) from 1970-2017, and skulls of 6 S. plumbea stranded along the southern Cape coast in South Africa from 1963-2002. Prevalence of cranial crassicaudiasis was evaluated according to sex and cranial maturity. Overall, prevalence in S. plumbea and T. aduncus taken off KZN was 13 and 31.9%, respectively. Parasitosis variably affected 1 or more cranial bones (frontal, pterygoid, maxillary and sphenoid). No significant difference was found by gender for either species, allowing sexes to be pooled. However, there was a significant difference in lesion prevalence by age, with immature T. aduncus 4.6 times more likely affected than adults, while for S. plumbea, the difference was 6.5-fold. As severe osteolytic lesions are unlikely to heal without trace, we propose that infection is more likely to have a fatal outcome for immature dolphins, possibly because of incomplete bone development, lower immune competence in clearing parasites or an over-exuberant inflammatory response in concert with parasitic enzymatic erosion. Cranial osteolysis was not observed in mature males (18 S. plumbea, 21 T. aduncus), suggesting potential cohort-linked immune-mediated resistance to infestation. Crassicauda spp. may play a role in the natural mortality of S. plumbea and T. aduncus, but the pathogenesis and population level impact remain unknown.

Sign in / Sign up

Export Citation Format

Share Document