Acoustic analysis of aft noise reduction techniques measured on a subsonic tip speed 50.8 cm (twenty inch) diameter fan

Sound data which were obtained during tests of a 50.8 cm diameter, subsonic tip speed, low pressure ratio fan were analyzed. The test matrix was divided into two major investigations: (1) source noise reduction techniques; and (2) aft duct noise reduction with acoustic treatment. Source noise reduction techniques were investigated which include minimizing second harmonic noise by varying vane/blade ratio, variation in spacing, and lowering the Mach number through the vane row to lower fan broadband noise. Treatment in the aft duct which includes flow noise effects, faceplate porosity, rotor OGV treatment, slant cell treatment, and splitter simulation with variable depth on the outer wall and constant thickness treatment on the inner wall was investigated. Variable boundary conditions such as variation in treatment panel thickness and orientation, and mixed porosity combined with variable thickness were examined. Significant results are reported

Household inventions

Citation: Clemons, L. Ethel. Household inventions. Senior thesis, Kansas State Agricultural College, 1905.Morse Department of Special CollectionsIntroduction: It is within relatively a few years that inventions to be used in the home have received any important consideration. Comparing the household with other industries it has been obviously belated in labor-saving devices. Farming has been made more successful by science and invention; the life of the agriculturist has been changed from that of drudgery to one of progressive enterprise, and "the evolutions and revolutions in commerce and manufactures are truly marvelous". It is true that much work has gone out of the house to be done by machines at the factory. However until about the middle of the nineteenth century the housewife had to do her own spinning, weaving and dyeing and each girl of the family had to weave the linen for her future use. As the kitchen is the room in which the woman of the house spends a large portion of her time, it is a room worthy of careful consideration. "While the parlor is the crown of the home, the kitchen is the heart". "As the heart by its ceaseless throbbing sends the streams of life through every part of the human system carrying disease or health, so the influence from the kitchen brings to the entire household weal or woe". The first kitchen of which we have record was that of the savages. It was the forest with a mat of leaves for a floor and the sky as a roof. The usual modes of cooking were either by placing the victuals in the ashes, on heated tones, or by braising them on sticks over the fire, while the few utensils used were of the crudest handmolded pottery. The Egyptian kitchen was a large circular room which was used for all purposes. In the center of the room was built a large fireplace and as there was no chimney the smoke had to escape through any outlet that it could penetrate

The Repository as Publisher: Opportunities and Challenges in a Dual Role

In tandem with increasing support for open access worldwide, academic libraries of all sizes have expanded their support of public dissemination of research beyond their walls. Through the establishment of institutional repositories, libraries are openly sharing articles, presentations, dissertations, media, and data files published elsewhere. In a related — but in some ways strikingly different — role, libraries are acting as publishers of new content through journals, monographs, and new media. Presenters will discuss questions and opportunities emerging from this dual role many libraries now fill, and describe strategies employed at their institutions to meet these challenges

Reaching Modern Students Through Amazing Screencasts

Are you frustrated with “one-shot” library sessions? Overcome this time limitation by creating great screencasts, allowing students to gain essential research skills at their own pace in their own place. You will learn how to create engaging screencasts and choose the best affordable screencasting software. Screencasting is a valuable addition to a librarian’s toolkit because: --Students have immediate access to research assistance --Content can be embedded in course management systems --It strengthens the library’s role in student and faculty research processes --It emulates a tiered reference model --Students can get to know librarians Our approach emphasizes the design of amazing screencasts using powerful software. Screencasting is a newer technique that librarians are using to deliver asynchronous library instruction. Unlike tutorials, these screencasts complement face-to-face interactions because students can develop prior knowledge of specific skills. This enhances library instruction and librarians can spend less time on basic information to focus on sophisticated research skills. Screencasts also extend learning outside of the classroom to reinforce skills taught in class. This workshop will help attendees focus their attention on the best approach to screencasts. First, we will provide some examples of exemplar screencasts. Then we will discuss what makes a “good” or “bad” screencast. Finally, we will spend most of the workshop in small groups creating screencasts

Reaching Modern Students Through Amazing Screencasts

Are you frustrated with “one-shot” library sessions? Overcome this time limitation by creating great screencasts, allowing students to gain essential research skills at their own pace in their own place. You will learn how to create engaging screencasts and choose the best affordable screencasting software. Screencasting is a valuable addition to a librarian’s toolkit because:--Students have immediate access to research assistance--Content can be embedded in course management systems--It strengthens the library’s role in student and faculty research processes--It emulates a tiered reference model--Students can get to know librariansOur approach emphasizes the design of amazing screencasts using powerful software.Screencasting is a newer technique that librarians are using to deliver asynchronous library instruction. Unlike tutorials, these screencasts complement face-to-face interactions because students can develop prior knowledge of specific skills. This enhances library instruction and librarians can spend less time on basic information to focus on sophisticated research skills. Screencasts also extend learning outside of the classroom to reinforce skills taught in class. This workshop will help attendees focus their attention on the best approach to screencasts. First, we will provide some examples of exemplar screencasts. Then we will discuss what makes a “good” or “bad” screencast. Finally, we will spend most of the workshop in small groups creating screencasts

Twice-Exceptional Black girls: A case study in early childhood

Twice-exceptional (2e) refers to children who are gifted or talented in one or more areas and also have a disability or learning difference. Despite the increasing awareness of 2e learners in recent years, many still lack recognition and support, particularly those from marginalized communities. Black girls are among the groups that are least likely to receive accurate identification and appropriate services for their 2e needs. This case study aims to shed light on the experiences of a 2E Black girl in early childhood and offer recommendations for school counselors to better support them

Climate Change and International Deforestation: Legislative Analysis

Deforestation accounts for nearly 20% of anthropogenic greenhouse gas emissions in the world. Deforestation results in carbon emissions when trees and underlying vegetation are burning or decomposing. Deforested areas that are later cultivated also release carbon to the atmosphere when soil carbon is oxidized. Further, deforested areas converted to other land uses (e.g., pastures) might sequester less carbon than forests, enabling greater levels of CO2 in the atmosphere. Providing incentives to prevent deforestation in foreign countries has been proposed in climate change legislation. An objective of this legislation is to provide funding from carbon markets to assist foreign countries in reducing deforestation and increasing forest restoration and afforestation. Challenges to this approach include implementing deforestation reduction activities in developing countries that may lack the capacity to monitor and enforce measures, avoiding harm to indigenous communities who rely on forest resources, and matching policies with the various drivers of deforestation in different regions around the world. Legislative policies on deforestation and climate change are analyzed in this report, and challenges for restoring forests in the tropics are discussed

Observations of neck-collared Canada geese near John F. Kennedy International Airport, New York

Canada geese (Branta canadensis) often cause significant damage when they strike aircraft. They are responsible for a reported minimum of $2.6 million in damage per year to civil aviation in the United States. Knowledge of goose movements in relation to airports would allow wildlife managers to allocate time and funds to manage those populations that pose the greatest threat to aircraft. We placed alpha-numeric neck collars on 300 Canada geese within 8 km of both John F. Kennedy International Airport (JFKIA) and LaGuardia Airport in New York, New York. We conducted weekly observations for 2 years within a 12- km radius of JFKIA at locations used by the geese. At the conclusion of the study, 45% of the collared geese remained within an 8-km radius of JFKIA, and four were killed at JFKIA during wildlife control operations. We observed birds at their original banding sites 75% of the time, and within 5 km of the banding location 95% of the time. Geese that remained in the study area were re-sighted at a mean straight-line distance of 3.6 (±3.1) km from their original banding location. We note that 78% of the re-sighting locations used by geese were within 8 km of JFKIA and that movements of these geese could take them over or onto JFKIA. Oiling goose eggs to kill the embryos, rounding up of flightless birds within 8 km of the airport, and bird-control activities at JFKIA and nearby areas all should be continued to reduce the probability of a catastrophic bird strike between aircraft using JFKIA and local Canada geese

Acoustic performance of a 50.8-cm (20-inch) diameter variable-pitch fan and inlet. Volume 2: Acoustic data

Results from acoustic tests on a 50.8 cm (20 inch) QCSEE Under-the-Wing (UTW) engine, variable pitch fan and inlet simulator are tabulated. Tests were run in both forward and reverse thrust mdoes with a bellmouth inlet, five accelerating inlets (one hardwall and four treated), and four low Mach number inlets (one hardwall and three treated). The 1/3 octave-band acoustic data are presented for the model size on the measured 5.2 m (17.0 ft) arc and also data scaled to full QCSEE size 71:20 on a 152.4 m (500 ft) sideline