923,959 research outputs found
The effects of content familiarity and language ability on reading comprehension performance of low-and high-ability Saudi tertiary students studying English as a foreign language
No full textThis study investigates the effects of content familiarity and language ability (defined as general L2 proficiency) on the comprehension performance of low- and high-ability Saudi students of English as a foreign language. One hundred and thirty-two male and female university students participated in this study, performing two reading comprehension tests on two different types of text (familiar and unfamiliar). The results showed that content familiarity and language ability had significant effects on the students' comprehension performance. They indicated that content familiarity facilitated reading comprehension, and that language ability had a significant effect on the comprehension performance of students at different levels. Language ability level may have played a compensatory role in facilitating the comprehension of the unfamiliar text. Educators designing and implementing reading courses need to consider these related factors.Corresponding Author:
Dr. Yousif A. N. AL-Shumaimeri, Assistant Professor, Department of Curricula and Instructions, College of Education, King Saud University, P.O.Box: 2458, Riyadh: 11451, Saudi Arabia. Email: [email protected]
Upgrading Of Elhaj Yousif Sewage Treatment Plant
No full textThis research deals with the new Elhaj Yousif Sewage Treatment Plant, which
serves Khartoum North Industrial areas and is proposed to serve the Residential area
of Khartoum Bahri.
From site visits, personal interview, and relevant documents and drawings,
Elhaj Yousif Treatment Plant is anticipated to be overloaded and as a result the
effluent quality will be deteriorated. The Treatment Plant was designed based on
BOD equal to 300 mg/l, TSS equal to 300 mg/l, and average flow rate of 40000 m3/d,
although the actual BOD influent equal to 1500 mg/l and TSS influent equal to 716.4
mg/l. The plant’s final effluent of BOD and TSS should equal to 20 mg/l and 30 mg/l
respectively as assigned by the Environment Health law, Sudan, 1975. Hence, the
treatment plant needs to undergo significant modifications and improvements.
In order to reduce the high BOD, the raw sewage must be composed of at
least two thirds domestic wastes blended with one third industrial waste. That means
the flow rate from industrial area should equal to 13000 m3/d and from residential
area should equal to 27000 m3/d. Blending domestic waste with industrial waste will
also guarantee the sufficiency of nutrients for bacteria to act expeditiously. For further
reduction in BOD and TSS it is recommended to put the old headwork or old
preliminary treatment system into action. Since the concrete state and dimensions of
the preliminary treatment system is in good condition and can serve future needs,
however some mechanical and electrical components need some maintenance. With
regard to primary treatment it is better to add two more sedimentation tanks with the
same dimension of the existing ones. The removed BOD and TSS through the
headwork and the sedimentation tanks will be approximately equal to 800 mg/l and
337.6 mg/l respectively.
To avoid the organic shock loading and flow rates variation in the new
treatment plant, Equalization Basin unit must be introduced. As a consequence of the
overloaded Treatment Plant, the aeration basin of the biological Activated Sludge unit
should be modified. Fortunately the aeration basin volume accommodates BOD
removal but it needs to be supplied by 10 additional blowers. The aeration basin
process will act as extended aeration process.
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The wastewater effluent is planned to be reused for irrigation, therefore
disinfection is required as stated by WHO and FAO. However for effective
disinfection wastewater must be filtered whether through biological filters or physical
filters.
In addition to wastewater treatment, sludge must also be treated. The sludge
that is produced by the sedimentation tanks is solved by the addition of drying beds
for dewatering. Before dewatering, Bacteria must be destructed. This comes through
utilizing existing aerobic digester tanks. Due to energy shortage it is recommended to
convert the existing Aerobic Digester Tanks to Anaerobic Digester Tanks that
produce Methane gas which can be used as energy source
Photograph of Joe Solo, also known as Sulieman Yousif Saleh.
No full textA photograph of Joe Solo or Sulieman Yousif Saleh
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Re-Design of El Haj Yousif sewage treatment plant
No full textIn the Recent years Sudan has experienced a very big industrial
development, but this has not been accompanied with interest to avoid
environmental problems due to the insufficient expansion &
development in sewer system. Sewerage systems are only present in
the capital city where there are only two operating wastewater
treatment plants at El Haj Yousif and Soba .
In Khartoum North Industrial Area which accommodates simple
and light industries like foods, soap, and textiles, which produce a few
waste, the quality and quantities of industrial waste have changed over
the years resulting in treatment and mechanical problems that effected
El Haj Yousif treatment plant badly, and its efficiency decreased since
1975 till it stopped totally in 1998.
The Aim of this Research is to put El Haj Yousif treatment plant
into work. In order to achieve this objective the following has been
assumed:
o The connection of domestic waste water of Khartoum North
Residential area to dilute the industrial waste and improve its
sewage nature because it contains the microorganism and
organic matters needed for biodegradation of the waste.
o Evaluation of the quantities and quality of mixed waste water
(domestic and industrial) to determine the basis for design.
o Rehabilitation of the preliminary facilities (Screens & grid
chamber) and Re-design of primary clarifiers and Design of
aeration tank instead of stabilization ponds.
o Design secondary clarifier tanks for settling of activated sludge
& recycling part of it to the aeration tank and waste the
remaining to digestion.
o Using of effluent water as irrigation water for the cultivated area
in Koko scheme after mixing with the irrigation water in Koko
canal
Imagined Vessels: Ceramics by Paz G, Liz Hernández, Cathy Lu, Maria Porges, and Maryam Yousif
No full textA recording of the opening panel discussion with Paz G, Liz Hernández, Cathy Lu (remote), Maria Porgres, and Maryam Yousif and MUSE grad Anyssa Govea as moderator. Original video streaming on YouTube here :https://youtu.be/GSRnb9SUvB
Molecular genetic and physiological studies to unravel the mystery of Sphingomonas wittichii RW1 dibenzo-p-dioxin degradation
No full textDibenzofuran and dibenzo-p-dioxin are ubiquitous environmental pollutants in soil and sediment. Sphingomonas wittichii RW1 is one of a few strains known for the ability to grow on the related compounds dibenzofuran (DBF) and dibenzo-p-dioxin (DXN) as the sole source of carbon. The genes for the initial steps in the DBF catabolic pathway (ring hydroxylating dioxygenase, ring cleavage dioxygenase, and a hydrolase) which result in the formation of salicylate and a five-carbon fragment have been localized to a mega-plasmid designated pSWIT02 in RW1. Plasmids highly similar to pSWIT02 have been found in other DBF degrading Sphingomonas strains. However, despite having the pSWIT02-encoded DBF degradation pathway these other bacteria are not capable of growth on DXN. This thesis describes involvement of chromosomally encoded genes in dibenzo-p-dioxin degradation by RW1. RW1 lacking the pSWIT02 dbfB gene grows extremely slowly on DBF and accumulates the ring cleavage substrate 2,2',3-trihydroxybiphenyl. The mutant grows normally on DXN as the sole source of carbon indicating that dbfB is not necessary for the DXN catabolic pathway and suggesting involvement of other ring cleavage dioxygenases in DXN pathway. Knockout of gene SWIT3046 resulted in a strain that grows normally on DBF but that does not grow on DXN. The double knockout does not grow on either DBF or DXN. These results prove that separate ring cleavage enzymes are necessary for DBF and DXN degradation.We then examined the third enzymatic step in RW1, the hydrolase. RW1 lacking the pSWIT02 encoded gene dxnB1 or the chromosome encoded gene dxnB2 grow normally on both DBF and DXN. A double knockout of both genes does not grow on DBF but still grows on DXN. We then examined previously published transcriptomic data that showed that the SWIT0910 encoded hydrolase is up regulated during growth on DBF and DXN. A knockout of SWIT0910 grows normally on DBF but does not grow on DXN. Our results demonstrate that a chromosomally encoded hydrolase, SWIT0910, is absolutely required for growth on DXN and that two different hydrolases (chromosomally and plasmid encoded) contribute equally to growth on DBF.Genes for three biphenyl ring cleavage dioxygenases from Burkholderia xenovorans LB400, Sphingomonas yanoikuyae B1, and Pseudomonas putida F1 were moved into a mutant lacking the RW1 DBF and DXN ring cleavage genes. All three ring cleavage dioxygenases allowed the mutant RW1 to grow on DBF at different rates. Interestingly, only bphC from Burkholderia xenovorans LB400 allowed RW1 mutant to grow on DXN.Ph.D.Includes bibliographical reference
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
The construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
Modelling of Shaded and Unshaded Shallow-Ground Heat Pump System for a Residential Building Block in a Mediterranean Climate
No full textHeat pumps may be coupled to shallow-ground geothermal fields and used for the purpose of space heating and cooling of buildings. However, quite often it is not possible to
locate the geothermal field in cleared grounds, especially in cities where building density is high and land has a high premium. This leads to the possibility of burying the geothermal field under the basement of new building blocks, before construction of the building. In the present work, the shaded-unshaded arrangement is numerically studied by coupling the
software DesignBuilder-EnergyPlus to assess the building’s energy requirement with the software FEFLOW to solve the heat transfer equation in porous media. Assuming a standard
residential building block, the coupling between the two software is performed by assigning the thermal energy requirement for air conditioning, as calculated by EnergyPlus, to a flatpanel typology of ground heat exchanger simplified in a 2D FEFLOW’s domain. The results show that it is necessary to opt for a dual-source heat pump (air/geothermal) system
to ensure that the ground is not frozen or over-heated at peak times and to improve the overall performance of the system
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