The Effect of Homogenization Conditions on Extrusion Texture and Microstructure Evolution in AA3003

2014 ◽  
Vol 794-796 ◽  
pp. 1127-1132 ◽  
Author(s):  
Jing Qi Chen ◽  
Warren J. Poole ◽  
Nick C. Parson
Keyword(s):  
Microstructure Evolution ◽  
Extrusion Ratio ◽  
High Density ◽  
The Other ◽  
Low Density ◽  
Fibre Texture

Two different conditions were used to study the effect of homogenization on extrusion texture and microstructure evolution in AA3003. The first condition considered homogenization for 8 h at 500°C to obtain a high density of dispersoids and the other condition was homogenized for 24 h at 600°C to produce a sample with a very low density of dispersoids. After uniaxial extrusion at 400°C with a speed of 32 mm/s and an extrusion ratio of 70:1, the material with a high density of dispersoids formed <001> and <111> double fibre texture in the centre of extrusion rod and a smeared texture from <011> to <111> near the surface. For the material without dispersoids, only <001> texture fibre is observed in the centre of extrusion rod and a strong <011> fibre is observed near the surface.

scholarly journals Radio Recombination Lines from Starburst Galaxies: High and Low Density Ionized Gas

2002 ◽  
Vol 199 ◽  
pp. 243-244
Author(s):  
N.R. Mohan ◽  
K.R. Anantharamaiah ◽  
W.M. Goss
Keyword(s):  
Flux Density ◽  
Hii Regions ◽  
Starburst Galaxies ◽  
High Density ◽  
The Other ◽  
Low Density ◽  
Ionized Gas ◽  
Density Measurements ◽  
Radio Recombination Lines ◽  
Upper Limits

Radio recombination lines (RRL) at 8 GHz and 15 GHz detected from four starburst galaxies are shown to arise in compact high density HII regions, which are undetectable below ∼4 GHz. Detection of an RRL at 1.4 GHz towards one galaxy and upper limits in the other three are consistent with the presence of an equal amount of low density diffuse gas. Continuum flux density measurements using the GMRT will be important in constraining the properties of the diffuse gas.

Plant and animal responses of elephant grass pasture-based systems mixed with pinto peanut

2019 ◽  
Vol 157 (1) ◽  
pp. 63-71
Author(s):  
A. C. Vieira ◽  
C. J. Olivo ◽  
C. B. Adams ◽  
J. C. Sauthier ◽  
L. R. Proença ◽  
...  
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Nutritive Value ◽  
High Density ◽  
Forage Yield ◽  
The Other ◽  
Low Density ◽  
Elephant Grass ◽  
Herbage Yield ◽  
Grazing Systems

AbstractThe effects of growing pinto peanut mixed with elephant grass-based pastures are still little known. The aim of the current research was to evaluate the performance of herbage yield, nutritive value of forage and animal responses to levels of pinto peanut forage mass mixed with elephant grass in low-input systems. Three grazing systems were evaluated: (i) elephant grass-based (control); (ii) pinto peanut, low-density forage yield (63 g/kg of dry matter – DM) + elephant grass; and (iii) pinto peanut, high-density dry matter forage yield (206 g/kg DM) + elephant grass. The experimental design was completely randomized with the three treatments (grazing systems) and three replicates (paddocks) in split-plot grazing cycles. Forage samples were collected to evaluate the pasture and animal responses. Leaf blades of elephant grass and the other companion grasses of pinto peanut were collected to analyse the crude protein, in vitro digestible organic matter and total digestible nutrients. The pinto peanut, high-density dry matter forage yield + elephant grass treatment was found to give the best results in terms of herbage yield, forage intake and stocking rate, as well as having higher crude protein contents for both elephant grass and the other grasses, followed by pinto peanut with low-density forage yield + elephant grass and finally elephant grass alone. Better results were found with the grass–legume system for pasture and animal responses.

Effects of population density on female and male burrow characteristics in the fiddler crab, Uca bengali Crane, 1975

Crustaceana ◽  
2015 ◽  
Vol 88 (12-14) ◽  
pp. 1283-1299 ◽  
Author(s):  
Fahmida Wazed Tina ◽  
Mullica Jaroensutasinee ◽  
Krisanadej Jaroensutasinee
Keyword(s):  
Body Size ◽  
Population Density ◽  
Fiddler Crab ◽  
High Density ◽  
The Other ◽  
Low Density ◽  
Density Effects ◽  
Egg Incubation ◽  
Other Hand ◽  
Males And Females

We examined the effects of population density on body size and burrow characteristics ofUca bengaliCrane, 1975. We predicted that (1) males in high-density areas (HD) should be larger in size and build higher quality burrows than males in low-density areas (LD), and (2) HD females should be larger in size, but build lower quality burrows than LD females, as HD females can find higher numbers of good quality male burrows around them for breeding and egg incubation. Our results showed that males and females in HD were larger in size than those in LD. Since HD males were larger in size, they built higher quality burrows than males in LD. On the other hand, even though LD females were smaller in size than HD ones, they built higher quality burrows than HD females. Our results thus indicate that density effects both body size and burrow characteristics.

An experimental study of the behavior of blue grouse (Dendragapus obscurus). I. Differences between the founders from three populations

1975 ◽  
Vol 53 (9) ◽  
pp. 1222-1237 ◽  
Author(s):  
Arthur T. Bergerud ◽  
H. Dennis Hemus
Keyword(s):  
Vancouver Island ◽  
Mirror Image ◽  
High Density ◽  
The Other ◽  
Low Density ◽  
Single Population ◽  
High Density Population ◽  
Dendragapus Obscurus ◽  
Field Workers ◽  
Density Population

In 1970 the authors compared the behavior of two low-density populations of blue grouse (Dendragapus obscurus) with the behavior of a high-density population on Vancouver Island. They then introduced individuals from these populations onto four islands and compared the behavior of these founders in 1971 and 1972.One island received founders from all three populations, while the other three islands each received founders from a single population. Birds from two low-density populations were quite observable, and displayed frequently when approached by field workers, both at their capture sites on Vancouver Island and in different habitats on the release sites on islands. The high-density population was much less observable, and displayed less frequently than did the two low-density populations, both at the capture sites and on the release islands. Male founders from the low-density populations were more aggressive in interacting with their mirror image than were males from the high-density population. Male founders from the high-density population dispersed less from the release sites, had smaller territories, and settled closer together than did males from the two low-density populations. These findings are consistent with the view that animals have a form of behavior that spaces them out as numbers rise, and so prevents unlimited increase in numbers.

The effect of other organisms on the survival rate of Aphodius tasmaniae Hope (Scarabaeidae) in the lower south east of South Australia.

1962 ◽  
Vol 10 (4) ◽  
pp. 617 ◽  
Author(s):  
DA Maelzer
Keyword(s):  
Survival Rate ◽  
High Mortality ◽  
South Australia ◽  
High Density ◽  
The Other ◽  
Low Density ◽  
Competition For Food ◽  
Lower South

The survival rate of the univoltine species Aphodius tasmaniae in improved pastures in the lower south-east of South Australia is influenced by individuals of the same species (i.e. by density) and by individuals of many other species. The species is distributed patchily with areas of high density interspersed with more extensive areas of low density. In the areas of high density, competition for food occurs and larvae may "fight". Such fights result in deaths, but there is little evidence of high mortality resulting from competition and little evidence that "density-induced combat" governs the number of the species. Of the other species which influence A. tasmaniae it is considered that the entomophagous fungus Cordyceps aphodii Mathieson is the only one which, in conjunction with water in winter, causes a sufficiently variable mortality from year to year to contribute significantly towards changes in numbers of A. tasmaniae from generation to generation.

Biochemical Changes in Mild Hypothyroidism and its Affiliation with Dyslipidemia in Pakistan

2021 ◽  
Vol 15 (9) ◽  
pp. 2890-2892
Author(s):  
Ayesha Zubair ◽  
Sabahat Fatima ◽  
Saleha Akram , Nizami ◽  
Anas Khalil ◽  
Rabia Sattar ◽  
...  
Keyword(s):  
Thyroid Function ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
High Density ◽  
The Other ◽  
Medical Society ◽  
Low Density ◽  
Group I ◽  
Lipid Abnormalities ◽  
Mild Hypothyroidism

Background: Primary hypothyroidism is associated with the synthesis, metabolism and lipid abnormalities of thyroid hormones. Individuals with hypothyroidism have been shown to have high low density cholesterol and low high density cholesterol. In individuals with normal thyroid the association is usually observed between total cholesterol and thyroid stimulating hormone. Due to lipid abnormalities one group of experts is of the opinion that individuals with TSH ≤10 mIU/L having features of hypothyroidism should be started with thyroxine medication. Whereas, the other group does not support this idea making the topic controversial. In Pakistan the association between thyroid function and lipid abnormalities have so far not been studied which leaves a room for research at this topic. Aim: To explore the association between mild hypothyroidism and lipid abnormalities in Pakistani population. Methodology: This cross sectional study is carried out at Alfalah Welfare Medical Society, Lahore as part of their medical checkup, all the subjects gave written informed consent. The study was done from January 2021 to July 2021. Results: Thyroid function test of 2312 (85.4%) of the subjects was found to be normal. Subjects with mild hypothyroidism among Group-I were 324 (11.9%) whereas mild hypothyroidism in group-II were 36(1.3%). Triglyceride (3.99±0.80 compared to 3.79±0.70 mmol/L, p˂0.0001), low density lipoprotein (2.59±0.60 compared to 2.29±0.39mmol/L, p˂0.0001) and high density lipoprotein was (1.10±0.14 compared to 1.14±0.15 mmol/L). Conclusion: In patients with mild hypothyroidism due to deranged lipid profile atherogenesis was observed. In continuation to it low high density lipoproteins were also observed in children and a raised triglyceride and low density lipoprotein in the adult population. On the other hand, in patients with mild hypothyroidism having low TSH levels no such abnormalities were observed. Keywords: Dyslipidemia, Subclinical Hypothyrodism, Thyroid

Quantitative defect studies in semiconductor TEM samples prepared by low angle ion milling

1995 ◽  
Vol 53 ◽  
pp. 512-513
Author(s):  
L. Mulestagno ◽  
J.C. Holzer ◽  
P. Fraundorf
Keyword(s):  
Sample Preparation ◽  
Milling Time ◽  
High Density ◽  
Low Density ◽  
Ion Milling ◽  
High Quality ◽  
Variable Angle ◽  
Major Disadvantage ◽  
Induced Defects

Due to the wealth of information, both analytical and structural that can be obtained from it TEM always has been a favorite tool for the analysis of process-induced defects in semiconductor wafers. The only major disadvantage has always been, that the volume under study in the TEM is relatively small, making it difficult to locate low density defects, and sample preparation is a somewhat lengthy procedure. This problem has been somewhat alleviated by the availability of efficient low angle milling.Using a PIPS® variable angle ion -mill, manufactured by Gatan, we have been consistently obtaining planar specimens with a high quality thin area in excess of 5 × 104 μm2 in about half an hour (milling time), which has made it possible to locate defects at lower densities, or, for defects of relatively high density, obtain information which is statistically more significant (table 1).

Scanning Electron Microscopic and Electrophoretic Observations on Barium Sulphate Used to Adsorb Clotting Factors

1975 ◽  
Vol 33 (02) ◽  
pp. 256-270
Author(s):  
R. M Howell ◽  
S. L. M Deacon
Keyword(s):  
Electron Microscopy ◽  
Factor Xa ◽  
Barium Sulphate ◽  
High Density ◽  
Low Density ◽  
Factor X ◽  
Clotting Factors ◽  
Electron Microscopic ◽  
Complementary Techniques ◽  
Scanning Electron

SummaryElectron microscopy and particle electrophoresis were found to be complementary techniques with which to complete the physical data from an earlier study on barium sulphates used to adsorb clotting factors from serum. The differences revealed by scanning electron microscopy (S. E. M.) in the physical shape of low and high density grades of barium sulphate particles appear to be of greater significance than charge as expressed by electrophoretic mobility, in determining whether or not precursor or preformed factor Xa is eluted.This conclusion was based on the finding that at pH values close to 7, where the adsorption from serum occurs, all samples with the exception of natural barytes were uncharged. However as the high-density, or soil-grade, was found by S. E. M. to consist of large solid crystals it was suggested that this shape might induce activation of factor X as a result of partial denaturation and consequent unfolding of the adsorbed protein. In contrast, uptake of protein into the centre of the porous aggregates revealed by S. E. M. pictures of low-density or X-ray grade barium sulphate may afford protection against denaturation and exposure of the enzyme site.The porous nature of particles of low-density barium sulphate compared with the solid crystalline forms of other grades accounts not only for its lower bulk density but also for its greater surface/gram ratio which is reflected by an ability to adsorb more protein from serum.Neither technique produced evidence from any of the samples to indicate the presence of stabilising agents sometimes used to coat particles in barium meals.

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