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Register a new userVisual Analysis of Flocculation by Microthrix parvicella
التحليل العياني لتلبد جراثيم Microthrix parvicelle
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Damascus University ورقة بحثية
Publication date
2001
fields
Biology
and research's language is
العربية
Authors
محمد فخري الشهواني( باحث )
Created by
Shamra Editor
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إن التحليل العياني للتلبد الذي تسببه جراثيم ( M. parvicella ) المعزولة من مياه الصرف الصحي، قد أجريت دراسته في المختبر باستعمال أوساط زرعيه مصنعة مضاف إليها مخثرات مختلفة FeCl٣, AlCl٣, Al٢(SO٤)٣, FeSO٤.
Visual analysis of flocculation caused by the bacteria Microthrix parvicella isolated from domestic sewage was studied in the laboratory using synthetic sewage with the addition of different coagulants: FeCl٣, AICI٣, AI٢ (SO٤)٣ and FeSO٤.
References used
Al-Shahwani, M. F. & Jazrawi, S. F. (١٩٨٥). Bioflocculation of the effluents from some agricultural and foodstuff industries. Agricultural Wastes, ١٤, ١٦١-٧١
Al-Shahwani, M. F. & Jazrawi, S. F. Al-Rawi, E. H. & Ayar, N.S. (١٩٨٤). Growth and heavy metal removal by K. aerogenes at different pH and temperature. J. Environ. Sci. Health, A١٩, ٤٤٥-٥٧
Al-Shahwani, M. F., Jazrawi, S. F.& Al-Rawi, E. H. (١٩٨٦). Effect of microbial communities on floc sizes and numbers in industrial and domestic effluents. Agricultural Wastes, ١٦, ٣٠٣-١١
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most of companies wish to decrease maintenance and on the other
hand having the same target with low weight and no friction
although it may cost more, when a machine is built. Using
flexural(also flexure) hinges in a system, at least, leads to all
of
these advantages. Considering a planar mechanical system consists
of double seven bar mechanism with revolute joints, we replace
each revolute joint with super elastic hinge. Doing so, we have a
gate to build a system, strongly recommended, to achieve the same
goal using minimum energy. The main purpose of this paper is to
elaborate a mathematical apparatus able to estimate the deviations
of the considered system before and after replacing revolute joints
taking into account the real performance of the novel system
through large bending displacements in the flexure (flexural) hinges.
يتحدث المحتوى عن طرق الاستيفاء بالتحليل العددي بشكل برمجي وهما طريقتين طريقة استيفاء لاغرانج وطريقة سبلاين الخطية
بلغة c++ والجافا وهما موجودين على شكل تطبيق اندرويد
The demography is a quantitative science that was established on a statistical base,
but it has quickly developed its own methods and research elements in response to the
particularity of demographic phenomenon and to its real need of specific elem
ents of
measuring and analysis that exceed what applied statistics propose. And even if
demography meets with many other sciences, yet it has a particularity that results firstly
from the effect of time on its events, and secondly from the fact that the demographic
events are submitted to a necessary order that must be taken in consideration when we pass
from demographic to social analysis of elements and data.
This research illuminates this particularity of the necessary order in demographic
events, through two access: the first treats time as a demographic concept and how it is
related to the necessary order of demographic events; and the second treats the effect of
this necessary order in the social analysis of the events that both demography and
sociology are interested in, in order to show the importance of gathering demographic and
social analysis when treating different demographic-social events, and to illustrate the
shortfalls that may affect some models of social analysis if it's not preceded by a
demographic analysis of the studied event.
Using data from English cloze tests, in which subjects also self-reported their gender, age, education, and race, we examine performance differences of pretrained language models across demographic groups, defined by these (protected) attributes. We
demonstrate wide performance gaps across demographic groups and show that pretrained language models systematically disfavor young non-white male speakers; i.e., not only do pretrained language models learn social biases (stereotypical associations) -- pretrained language models also learn sociolectal biases, learning to speak more like some than like others. We show, however, that, with the exception of BERT models, larger pretrained language models reduce some the performance gaps between majority and minority groups.
Due to the rapid development in the manufacturing of high
precision mechanism. It is required to reduce spending on its
manufacturing and (due to the friction). On the other it is very
important to achieve the same target with light weight and no
frictions. The all above objectives can be obtained by building the
machine to move as one body by using the elastic hinges.
The main purpose of this research is to accuracy of eight-six bar
mechanism -linked by fixed link , before and after replacing
revolute hinges with elastic ones.
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