196,114 research outputs found
Nitrates Removal from Groundwater via Selective Anion-Exchange Resins of IONAC Type
No full textW pracy omówiono wyniki badań nad możliwością usuwania azotanów z wód podziemnych przeznaczonych do spożycia. W badaniach określono przydatność procesu wymiany jonowej na selektywnych żywicach anionowymiennych do usuwania azotanów z wody, na przykładzie żywicy IONAC SR-7. Procesowi wymiany jonowej poddano wodę o zawartości azotanów 15÷30 gN/m3, w obecności jonów chlorkowych około 50 gCl-/m3 i siarczanowych około 90 gSO42-/m3. Prędkość przepływu wody przez kolumnę z żywicą jonowymienną wynosiła 10÷25 m/h. W badaniach wyznaczono zdolność wymienną żywicy w stosunku do azotanów na poziomie 0,5 val/dm3. Ustalono także wydajność procesu wymiany jonowej do wyczerpania zdolności jonowymiennej żywicy, jako stosunek objętości oczyszczonej wody do objętości żywicy, na poziomie 200-280.The IONAC SR-7 resin was used to substantiate the applicability of ion exchange on selective anion-exchange resins to the removal of nitrates from groundwater which was to serve for drinking purposes. The concentration of nitrates in the groundwater treated by the ion-exchange process varied from 15 to 30 gN/m3, in the presence of chloride ions (50 gCl-/m3) and sulfate ions (90 gSO42-/m3). The velocity of water flow through the ion-exchange column ranged between 10 and 25 m/h. The exchange capacity of the resin with respect to nitrates determined in the experimental study was 0.5 val/dm3. The efficiency of the ion-exchange process up to the exhaustion of the ion-exchange capacity of the resin (expressed as the ratio of the treated water volume to the resin volume) was found to vary from 200 to 400
Subsets of migrating intestinal dendritic cells
Get PDFDendritic cells (DCs) in the intestine are heterogeneous. Phenotypically different populations of conventional DCs have been identified in the intestinal lamina propria, Peyer's patches, and in the draining mesenteric lymph nodes, to which these DCs constitutively migrate. Markers used to identify these populations include major histocompatibility complex class II, CD11c, CD8α, CD11b, and CD103. Extensive studies in rats, summarized here, which involved collection of migrating DCs by thoracic duct cannulation after mesenteric lymphadenectomy, have clearly demonstrated that the subsets of migrating intestinal lymph DCs have different functional properties. The subsets might play different roles in the induction of oral tolerance and in driving systemic immune responses after vaccination or intestinal stimulation with Toll-like receptor ligands. The use of these surgical techniques allows investigation of the functions of purified subsets of migrating DCs. However, in the rat, these studies are limited by the range of available reagents and are difficult to compare with data from other species in this fast-moving field. Recent refinements have enabled the collection of migrating intestinal DCs from mice; our initial results are described here. We believe that these studies will generate exciting data and have the potential to resolve important questions about the functions of migrating intestinal DC subsets
Mastering Lymphatic Microsurgery
No full textBackground: Advanced microsurgical techniques have emerged as a promising
approach for the treatment of lymphedema, but achieving international standards
is limited by a scarcity of adequate training models. The purpose of this report is
to describe our in vivo porcine training model for microsurgery.
Study Design: Five female common-breed pigs (Sus scrofa domesticus)
weighing 20 to 28 kg were placed under general anesthesia, and blue patent violet
dye was injected to highlight lymphatic structures and prepare the pigs for anatomical
exploration andmicrosurgery. The number and type of patent anastomoses
achieved and lymph node flaps created and any anatomical differences between
porcine and human vessels were noted, in light of evaluating the use of pigs as a
training model for microsurgery in living tissue.
Results: Multiple lymphatic-venous anastomoses were created at the site of a
single incision made at the subinguinal region, running medial and parallel
to the saphenous vessels. Ten multiple lymphatic-venous anastomoses were
created in total, and all were demonstrated to be patent. Four lymph node flaps
were prepared for lymph node transfer. The superficial lymphatic collector system
in the caudal limb of the pig was identified and described with particular reference
to the superficial, medial (dominant), and lateral branches along the saphenous
vein and its accessory.
Conclusions: The authors present a safe and adaptable in vivo experimental
microsurgical porcine model that provides the opportunity to practice several
advanced lymphatic microsurgical techniques in the same animal. The ideal
lymph node transfer training model can be developed fromthis anatomical detail,
giving the opportunity to use it for artery-to-artery anastomoses, vein-to-vein
anastomoses, and lymphatic-to-lymphatic anastomoses
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
The removal of toxic metals from liquid effluents by ion exchange resins. Part X: Antimony(III) /H+/IONAC SR7
No full textThe present work investigates the removal of Sb(III) from acidic aqueous solution by the ion exchange resin Ionac SR7. Several experimental parameters were considered in the study: stirring speed of the system (280-1000 min), temperature (20-60 °C), aqueous acidity (0.1-2 M HCl), resin dosage (2.5-20 g·L) and the source of the aqueous ionic strength. The load of Sb(III) onto the resin is attributable to an anion exchange reaction, being this process exothermic and spontaneous. Based in the experimental data, several modes were tested to explain loading kinetics, loading mechanism and loading isotherm, which respectively are the pseudo-second order kinetic model, the particle-diffusion controlled model and the Freundlich isotherm. The performance of the resin with respect to antimony load was compared against other anion exchanger resins and multiwalled.carbon nanotubes. It was found that water is an effective medium to remove antimony(III) from the metal-loaded resin.To the CSIC (Spain) for support
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
Get PDFFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Intern experience at CH���M Hill, Inc.: an internship report
Get PDFIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical referencesA review of the author's internship experience with CH���M HILL, Inc.
during the period September 1975 through May 1976 is presented. During this nine month
internship the author worked as an Engineer II in the Industrial Processes discipline of this
large consulting engineering firm... The author's prime responsibility was as one of three
lead design engineers on the design of a large wastewater treatment facility for a pulp mill
in Hoquiam, Washington owned by ITT Rayonier Inc. The work generally consisted of the design
of individual treatment units and associated piping and pumping. The purpose of the project
was to provide wastewater treatment capabilities that would satisfy the effluent limitations
(standards) imposed upon the mill by the State of Washington Department of Ecology and the
U.S. Environmental Protection Agency. The author's assignment also entailed necessary
interaction with the project manager and other CH���M HILL design engineers and support staff
members, the client's representatives, and representatives of two other consulting engineering
firms working on the project. Thus, the internship position at CH���M HILL provided considerable
experience coordinating the author's work with the work of other engineers, guiding the design
and administrative efforts of a support staff, and interacting regularly with the client and
other consulting firms. This broad exposure to a variety of engineering and organizational
problems provided a valuable educational experience
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