1,695 research outputs found
Optimizing Hybrid Ventilation Control Strategies Toward Zero-Cooling Energy Building
No full textOptimal ventilation strategies are fundamental to achieve net/nearly-zero energy buildings. In this study, three hybrid ventilation control strategies are proposed to minimize the cooling need in an open-plan office building, located in the center of Glasgow (Scotland). The performance of the three proposals is assessed by IDA ICE (a whole building performance simulation tool) and compared to a traditional fully mechanical ventilation system. The performance comparison includes different criteria (i.e., indoor temperature and predicated percentage of dissatisfied (PPD) for assessing the indoor comfort and CO2 level for assessing the indoor air quality). The results show that the three proposed hybrid ventilation strategies are able to minimize the cooling need to zero. They can also imply a drastic reduction of AHU heating power, compared with a mechanical ventilation system without heat recovery (or with low efficiency heat recovery). In addition, they significantly save the fan energy. The only drawback of the proposed strategies is that they might increase the space heating demand. For instance, the first and second strategies save about 75% and 50% of AHU (air handling unit) fan energy; however, the space heating increases by about 4.2 and 2.2 kWh/m2a, respectively. The third strategy features as the best proposal because it saves around 68% of fan energy with less increase (1.3 kWh/m2a) in space heating demand. Moreover, it ensures higher thermal comfort and indoor air quality levels compared to the first and second proposals.publishedVersionCopyright © 2019 Hamdy and Mauro. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms
Operations research : an introduction / Hamdy A. Taha.
No full textIncludes bibliographical references and index.xx, 813 pages. :Never HIGHLIGHT a Book Again! Includes all testable terms, concepts, persons, places, and events. Cram101 Just the FACTS101 studyguides gives all of the outlines, highlights, and quizzes for your textbook with optional online comprehensive practice tests. Only Cram101 is Textbook Specific. Accompanies: 9780131889231. This item is printed on demand
sj-docx-1-mpp-10.1177_23814683221115416 – Supplemental material for Gist Representations and Decision-Making Processes Affecting Antibiotic Prescribing for Children with Acute Otitis Media
No full textSupplemental material, sj-docx-1-mpp-10.1177_23814683221115416 for Gist Representations and Decision-Making Processes Affecting Antibiotic Prescribing for Children with Acute Otitis Media by Deniz Marti, Rana F. Hamdy and David A. Broniatowski in MDM Policy & Practice</p
Mapping Connections between Neighborhoods in Response to Community-Based Social Needs
No full textGeographic proximity might not be the only factor influencing the connections between neighborhoods within the same city. Most likely, the community’s needs and behaviors play a role in facilitating or hindering any connections between these urban areas. Accordingly, relationships between communities may differ or be similar based on their respective characteristics. This paper aims to demonstrate that communities are close based on the needs they share, regardless of their ethnicity or geographic location. In this study, a time series analysis of neighborhoods’ needs is explored to gain a deeper understanding of the communities’ network. The study takes into account the co-occurrence of complaints/reports from residents regarding the same issue. The dataset was retrieved from the Boston Area Research Initiative (BARI) and the 311 system that describe the features of neighborhoods regarding non-emergency issues. Subsequently, the connection between neighborhoods in the City of Boston was analyzed using a mixture of PCA, K-means, association rule mining, and a network creation tool. Moreover, clustering coefficients and degrees of centrality were used as significant factors in identifying the members of groups and marking crucial nodes in the network. A series of graphs were generated to show how the neighborhoods are linked based on their socioeconomic concerns. The results prove that even geographically disconnected neighborhoods within Boston have similar social needs, despite their distance from one another. Furthermore, it revealed that some neighborhoods can act as linking bridges for other neighborhoods, while others may be isolated within the network graph. This study has increased awareness of urban aspects. The authorities may consider other dimensions than the traditional ones regarding neighborhood development and addressing problems. Finally, it helps to identify common characteristics between neighborhoods, which facilitates the policy making process
Sheep research and development, 1966
No full textFactors associated with the ram influence on ewe fertility / C. F. Parker and D. S. Bell -- Observations on shrinkage in lambs -- Stocking rate and companion grazing on Kentucky Bluegrass-Trefoil pastures / R. W. Van Keuren -- Interrelationship of certain lamb carcass characteristics / B. D. VanStavern, C. F. Parker and J. K. Judy -- The importance of progeny differences among creep-fed slaughter lambs from selected Shropshire sires / C. F. Parker, J. K. Judy and B. D. VanStavern -- Effect of vitamin C on lamb pneumonia and mortality / A. H. Hamdy, W. D. Pounden, A. L. Trapp, D. R. Redman and D. S. Bell -- The effect of antibiotic treatment on mortality and growth rate of Columbia and Targhee lambs / D. S. Bell, A. H. Hamdy, C. F. Parker and D. R. Redman -- Practices used in Ohio for producing three lamb crops in two years / C. F. Parker and R. H. Grimsha
Digital holographic microscopy for the study of nano-fibers
No full textThe advantages of digital holographic microscopy to record not only the intensity but also the optical phase are employed. The experimental arrangement comprises a Mach-Zehnder type interferometer with a microscopic objective of magnification 100x. The used camera is a 5 Mpixels Allied Vision Guppy Pro F-503 with a pixel pitch of 2.2 μm. The lateral magnification is set to about 200x based on the standard MIL-STD-150A 1951 USAF resolution test target. The dimensions of the aggregated natural cellulose nanowhisker fibers used are in the range of some hundreds of nanometers, which are positioned in the front of the microscopic objective using a 3D translation stage in the object arm of the holographic setup. The recorded off-axis holograms are refocused using the angular spectrum method. The reconstructed complex field is used to calculate optical phase and intensity distributions of the object at different reconstructions depths. The dimensions and orientation of the fibers can be evaluated from the optical field at different depths. Then, the shape and textures along the aggregated natural cellulose nanowhisker fiber can be presented in 3D space. The nano fiber found to have the dimensions of mean width 223 nm, depth 308 nm and length of 8.1 μm. Further, the mean local refractive index of the nano fibers can be calculated (n=1.501).</p
Risk Factors for Complications in Children with Staphylococcus aureus Bacteremia
No full textObjectives: To determine risk factors for complications in children with Staphylococcus aureus (S aureus) bacteremia, including methicillin resistance. Study design: Single center, retrospective cohort study of children ≤18 years of age hospitalized with S aureus bacteremia. We compared clinical characteristics and outcomes between those with methicillin-sensitive S aureus (MSSA) and methicillin-resistant S aureus (MRSA) bacteremia. Multivariate regression models identified risk factors associated with developing complications and with longer duration of bacteremia. Results: We identified 394 episodes of S aureus bacteremia, 279 (70.8%) with MSSA, and 115 (29.2%) with MRSA. Primary site of infection was catheter-related in 34%, musculoskeletal in 30%, skin/soft tissue in 10.2%, pneumonia in 6.4%, and endovascular in 6.6%. Eight children (2.0%) died within 30 days because of S aureus bacteremia, 15 (3.5%) had recurrence within 30 days, and 38 (9.6%) had complications including septic emboli or a metastatic focus of infection. Methicillin resistance was associated with development of a complication (aOR 3.31; 95% CI 1.60-6.85), and catheter-related infections were less likely to be associated with a complication (aOR 0.40; 95% CI 0.15-1.03). In a Poisson regression analysis on duration of bacteremia, methicillin resistance, musculoskeletal infection, endovascular infection, black race, and delayed intervention for source control were significantly associated with longer duration of bacteremia. Conclusions: In this cohort of children with S aureus bacteremia, MRSA infections ere associated with longer duration of bacteremia and a higher likelihood of complications
Zone size interpretive criteria for novobiocin susceptibility testing on Mueller Hinton agar containing blood [with reference to Staphylococcus aureus, Streptococcus agalactiae, S. dysgalactiae and S. uberis]
No full textRE: 15 ref.; SC: ZA; CA; VE; 0ISource type: Electronic(1) http://upei-resolver.asin-risa.ca?sid=SP:CABI&id=pmid:&id=&issn=&isbn=&volume=&issue=&spage=99&pages=99-110&date=1981&title=Proceedings%20of%20the%20Annual%20Meeting%20of%20the%20American%20Association%20of%20Veterinary%20Laboratory%20Diagnosticians&atitle=Zone%20size%20interpretive%20criteria%20for%20novobiocin%20susceptibility%20testing%20on%20Mueller%20Hinton%20agar%20containing%20blood%20%5bwith%20reference%20to%20Staphylococcus%20aureus%2c%20Streptococcus%20agalactiae%2c%20S.%20dysgalactiae%20and%20S.%20uberis%5d.&aulast=Hamdy&pid=%3Cauthor%3EHamdy%2c%20A%20H%3bKratzer%2c%20D%20D%3bBarnes%2c%20F%20D%3bCone%2c%20J%3bHayes%2c%20G%3bHeider%2c%20L%20E%3bWard%2c%20G%3C%2Fauthor%3E%3CAN%3E19832228416%3C%2FAN%3E%3CDT%3EJournal%20article%3C%2FDT%3
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