TiO2-HDPE Composite: Bone Bonding Ability and Biocompatibility

2006 ◽  
Vol 309-311 ◽  
pp. 415-418 ◽  
Author(s):  
Tomonori Nasu ◽  
Shunsuke Fujibayashi ◽  
Masashi Neo ◽  
Takashi Nakamura
Keyword(s):  
High Density Polyethylene ◽  
Bone Substitute ◽  
Failure Load ◽  
The Other ◽  
Ability Test ◽  
Polyethylene Composite ◽  
Tio2 Particles ◽  
Novel Material ◽  
Lower Ability ◽  
Biocompatibility Test

A novel material, namely, TiO2-HDPE (TiO2/high density polyethylene) composite was developed by our research group. Its mechanical properties are similar to those of the human cortical bone; hence, we examined the possibility of using it as a bone substitute. We prepared two groups of TiO2-HDPE; one was subjected to ultraviolet irradiation for 0.1 h and the other for 9 h. In bone bonding ability test, the former indicated a lower ability than the latter, which showed approximately 7 to 8 N of failure load. The bone bonding ability of the latter group alone is not sufficient for clinical application; on the other hand, the biocompatibility test was carried out. In the biocompatibility test, the group that was irradiated for 9 h revealed neither a major inflammatory response nor formation of neoplasm. We have to further examine alternate types of polyethylene or TiO2 particles in order to improve the bone bonding ability.

Selective Education in Guyana: Comparing the Psychosocial Well-Being of Students Across Schools

2020 ◽  
Vol 42 (1&2) ◽  
pp. 110-138
Author(s):  
Charlotte Shaw ◽  
Janelle Levesque ◽  
Katrina McKie
Keyword(s):  
Education Research ◽  
Ability Grouping ◽  
School Attendance ◽  
Well Being ◽  
The Other ◽  
Future Research ◽  
High Ability ◽  
Student Attendance ◽  
Lower Ability ◽  
Low Ability

Selective education research has demonstrated that students are aware of the low status of being allocated to a low-ability school. Recent data in Guyana has shown that low-ability school attendance is associated with low rates of student attendance, retention, and graduation. This study aims to understand the effects of ability grouping on students by comparing the psychosocial well-being of students from different ability schools. Data was collected from a sample of 193 adolescents (70 males and 123 females) aged 13-18 from four secondary schools; representing the four school ability rankings. It was hypothesised that student psychosocial well-being would be significantly lower in low-ability schools compared to high-ability schools. Unexpectedly, the results indicated that the highest ability school had significantly lower psychosocial well-being than the other lower ability schools. The results may be potentially explained by the theory of Big-Fish-Little-Pond Effect, however confirmation in future research is warranted.

The Effect of Implicit Racial Bias on Recognition of Other-Race Faces

2021 ◽  
Author(s):  
Tobiasz Trawinski ◽  
Araz Aslanian ◽  
Olivia S. Cheung
Keyword(s):  
Face Recognition ◽  
Racial Bias ◽  
Recognition Performance ◽  
Implicit Bias ◽  
Memory Task ◽  
The Other ◽  
Extensive Experience ◽  
Ability Test ◽  
Implicit Racial Bias ◽  
Recognition Ability

Previous research has established a possible link between recognition performance, individuation experience, and implicit racial bias of other-race faces. However, it remains unclear how implicit racial bias might influence other-race face processing in observers with relatively extensive experience with the other race. Here we examined how recognition of other-race faces might be modulated by observers’ implicit racial bias, in addition to the effects of experience and face recognition ability. Caucasian participants in a culturally diverse city completed a memory task for Asian and Caucasian faces, an implicit association test, an experience questionnaire towards Asians and Caucasians, and a face recognition ability test. Overall, participants showed significantly better recognition performance for other- than own-race faces. More importantly, recognition performance for other-race faces was positively predicted by increased face recognition ability, experience with Asians, and negatively predicted by increased positive bias towards Asians, which was modulated by an interaction between face recognition ability and implicit bias, with the effect of implicit bias observed predominantly in observers with high face recognition ability. Moreover, significant differences were observed among the positions of the first two fixations when participants learned the other-race faces, with the first fixation modulated by the effect of experience and the second fixation modulated by the interaction between implicit bias and face recognition ability. Taken together, these findings suggest the complexity in understanding the perceptual and socio-cognitive influences on the other-race effect, and that observers with high face recognition ability may more likely evaluate racial features involuntarily when recognizing other-race faces.

scholarly journals Influence of cultivar on the content of selected minerals in red beet roots (Beta vulgaris L.)

2016 ◽  
Vol 28 (2) ◽  
pp. 143-150 ◽  
Author(s):  
Zofia Nizioł-Łukaszewska ◽  
Maria Gawęda
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Content ◽  
The Other ◽  
Red Beet ◽  
Lower Ability ◽  
Growing Conditions ◽  
Set Up ◽  
The University ◽  
The Impact

Abstract Beetroot is a vegetable that accumulate heavy metals. This is largely dependent on the cultivar, methods and growing conditions. The aim of the study was to determine the composition of elements in the roots of 15 cultivars of red beet. The analysis assessed the content of macroelements (Na, P) and heavy metals (Cd, Cr, Mn, Zn). Most soils of the Lesser Poland region are exposed to the impact of industrial and transportation pollution. The soils of this region are characterized by strong acidification as well as natural or increased heavy metal content. The experiment was set up at the experimental field of the Department of Vegetable and Medicinal Plants of the University of Agriculture in Krakow, in 2009-2010. On the basis of the performed analysis, ‘Opolski’ was chosen as the cultivar that was characterized by a high content of macroelements and lower ability to accumulate heavy metals than the other tested cultivars. The lowest ability to accumulate heavy metals (Cd and Cr) was found in the cases of cultivars with cylindrical root shapes, such as Rywal or Opolski. One can indicate such cultivars as Astar F1 or Nabab F1 as cultivars recommended for cultivation in ecologically threatened areas.

Effects of conductive graphite filler loading on physical properties of high-density polyethylene composite

2012 ◽  
Vol 33 (7) ◽  
pp. 1071-1076 ◽  
Author(s):  
I. Tavman ◽  
I. Krupa ◽  
M. Omastova ◽  
M. Sarikanat ◽  
I. Novak ◽  
...  
Keyword(s):  
Physical Properties ◽  
High Density Polyethylene ◽  
Filler Loading ◽  
High Density ◽  
Polyethylene Composite

Research on Plastic Wood Composite Materials Production Technology

2012 ◽  
Vol 182-183 ◽  
pp. 274-277
Author(s):  
Fang Huang
Keyword(s):  
Composite Material ◽  
High Density Polyethylene ◽  
Wood Flour ◽  
Wood Fiber ◽  
Waste Recycling ◽  
High Density ◽  
Natural Material ◽  
Wood Composite ◽  
Polyethylene Composite ◽  
Environmental Material

Wood flour is inexpensive, and can be used as a reinforcing agent to improve the mechanical properties of high density polyethylene, reduce cost. Wood fiber as a renewable natural material, biodegradation, therefore, high filling wood powder high density polyethylene composite material with certain environmental compatibility, at the same time, high density polyethylene can be a source of waste recycling materials, therefore plastic-wood composite material is a kind of can reduce the "white pollution" environmental material. [1-5]

Synthesis and Characterization of Porous Nano-Crystalline Barium Hexaferrite

2012 ◽  
Vol 622-623 ◽  
pp. 860-863
Author(s):  
S. Hamidizadeh ◽  
A. Ataie ◽  
Amin Nozari
Keyword(s):  
High Density Polyethylene ◽  
Single Phase ◽  
Barium Hexaferrite ◽  
Weight Percent ◽  
High Energy ◽  
High Density ◽  
Synthesis And Characterization ◽  
Polyethylene Composite ◽  
Nano Crystalline

Barium hexaferrite/high density polyethylene composite was prepared from synthesized barium hexaferrite as matrix with 0, 10, 20, 30, 40 wt.% of high density polyethylene via a high energy planetary ball milling for 10 h. The milling products were isostatically pressed and finally sintered at 1250 °C for 1 h. Effect of HDPE content on morphology of the products were investigated using scanning electron microscope (SEM). Vibrating samplemagnetometer (VSM) analysis of single phase BaFe12O19 indicates saturation magnetization and coercivity of 52 emu/g and 4300 Oe, respectively. Visually, as the weight percent of the HDPE increases, more porous structure was observed. Moreover, the density of the sintered sampleslinearly decreased from 4.16 to 1.41 g/cm3 by increasing the amount of HDPE from 0 to 40 wt.%.

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