973 research outputs found
Minnesota lamb consumption patterns
No full text1 online resource (PDF, 2 pages)This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu.Dahl, Dale C.; Egertson, Kenneth E.. (1966). Minnesota lamb consumption patterns. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/207513
Simulation of ultrasonic lamb wave generation, propagation and detection for an air coupled robotic scanner
No full textA computer simulator, to facilitate the design and assessment of a reconfigurable, air-coupled ultrasonic scanner is described and evaluated. The specific scanning system comprises a team of remote sensing agents, in the form of miniature robotic platforms that can reposition non-contact Lamb wave transducers over a plate type of structure, for the purpose of non-destructive evaluation (NDE). The overall objective is to implement reconfigurable array scanning, where transmission and reception are facilitated by different sensing agents which can be organised in a variety of pulse-echo and pitch-catch configurations, with guided waves used to generate data in the form of 2-D and 3-D images. The ability to reconfigure the scanner adaptively requires an understanding of the ultrasonic wave generation, its propagation and interaction with potential defects and boundaries. Transducer behaviour has been simulated using a linear systems approximation, with wave propagation in the structure modelled using the local interaction simulation approach (LISA). Integration of the linear systems and LISA approaches are validated for use in Lamb wave scanning by comparison with both analytic techniques and more computationally intensive commercial finite element/difference codes. Starting with fundamental dispersion data, the paper goes on to describe the simulation of wave propagation and the subsequent interaction with artificial defects and plate boundaries, before presenting a theoretical image obtained from a team of sensing agents based on the current generation of sensors and instrumentation
Lamb Wave Propagation in Sandwich Composite Structures for the Detection of Impact Damage
No full textLightweight composite sandwich structures are particularly susceptible to impact damage. Barely Visible Impact Damage (BVID) is known to affect the short and long term load bearing capacities of composite structures. Active acoustic Structural Health Monitoring (SHM) systems have the potential to detect such damages before they lead to structural failure, and could thus be applied in a condition based maintenance approach for the DragonFly fuselage. This study was aimed at increasing the level of understanding on the propagation of ultrasonic (Lamb) waves through sandwich composite media and its response to the DragonFly fuselage structural integrity. These two aspects were combined to arrive at a theoretical prediction on the influence of BVID on the through-transmitted signal in an active acoustic SHM system with a pitch-catch setup. The propagation mode and impact response were verified experimentally. A Finite Element (FE) model was created to verify the predictive power of the FE modelling technique for the specific application of active acoustic SHM. Two Lamb wave propagation modes were identified both theoretically and experimentally: the Global Lamb Wave mode and the Leaky Lamb Wave mode. Occurrence of these modes was dependent on the central frequency of the transmitted acoustic signal and the bulk wave velocities in the sandwich structure’s core compared to the Lamb wave mode propagation velocity in the structure’s skins. Other modes (True modes and Rayleigh modes) were identified theoretically, but could not be experimentally confirmed. It was expected and shown experimentally that the presence of impact damage on the propagation path of a signal with 120kHz central frequency reduced the time travelled by this signal between two points, while increasing the amount of energy lost. The latter effect was shown to be reversed at 160kHz, which was explained by the propagation of the signal at this frequency as Leaky Lamb Wave. The FE model could predict the overall trend at 120kHz, but not the exact magnitude of the influence of impact damage on the through-transmitted signal.Structural Integrity & CompositesAerospace Structures & MaterialsAerospace Engineerin
A Lamb wave-based liquid sensor for biomedical applications
No full textThis study presents an AlN-based Lamb wave (A0 mode) liquid sensing device designed for biomedical applications. The Lamb wave device features a 1.5 μm composite membrane consisting of a 500 nm LPCVD SiN and a 1 μm of a c-axis oriented AlN film. Additionally, an innovative 45° rotated IDT design was explored to minimize edge reflections towards the output IDT. Liquid testing experiments, involving IPA, DI water, and D-PBS, were conducted to see if the devices were able to differentiate between these liquids. Results demonstrate that the fabricated Lamb wave devices exhibit sensitivity to mass loading and can distinguish between liquids based on phase, frequency, and gain characteristics. Devices with the rotated IDT design have shown a significant increase in resonance by 15 dB, as well as enhanced sensitivity compared to those with the normal design. Furthermore, devices with the rotated design demonstrated a higher Q factor of 680, indicating superior performance over the normal design (Q factor of 450). These findings suggest that a Lamb wave device with the 45° rotated IDT design holds considerable potential for applications that demand accurate liquid characterization and detection.Electrical Engineerin
Rockerville CCC Camp F-10, Company 1794 - Sam Lamb, forestry foreman
No full textCaption: "#12b, Summer 1933. Author: E. H. Mason. Sam Lamb Forestry foreman.
A selection from Elia: an annotated translation of essays by Charles Lamb (1775-1834)
No full textO objetivo principal desta pesquisa de doutorado foi a execução da tradução comentada de uma seleção de ensaios do inglês Charles Lamb (1775-1834), publicados na London Magazine entre 1820 e 1822, assinados sob a persona Elia, e posteriormente reunidos no volume The Essays of Elia (1823). O valor desses ensaios está no próprio texto, sagaz e agradável, escrito num estilo que mescla traços antiquados e eruditos com uma linguagem coloquial, contemporânea a ele: um destilado de humor, ironia, lirismo, com certa zombaria livresca e arcaica. A tradução desses ensaios multifacetados, de tons e estilos heterogêneos que variam de ensaio a ensaio, e muitas vezes de um parágrafo a outro, exige abordagens e estratégias variadas. Complementam a pesquisa um estudo sobre os ensaios de periódicos no romantismo inglês, e uma análise sobre o estilo do autor e das complexidades de sua personaThe main objective of this doctoral research was to compose an annotated translation into Portuguese of the essays by Charles Lamb (1775-1834) published in The London Magazine between 1820 and 1822, under the persona of Elia, and then collected in the volume The Essays of Elia (1823). The value of these essays lies in the text itself, which are witty and humorous, written in a style that mixes old-fashioned and erudite traits with conversational language, contemporary to him: a distillate of humor, irony, lyricism, with some bookish and archaic mockery. Translating these multifaceted essays, with heterogeneous tones and styles that vary from essay to essay, and often from one paragraph to another, requires various approaches and strategies. Complementing this research is a study on periodical essays in English Romanticism, and an analysis about the author\'s style and the complexities of his person
The call to retrieval: Kenneth Cragg's Christian vocation to Islam
No full textThe career of the Anglican scholar and bishop, Kenneth Cragg, focusses attention on the Christian understanding of other faiths in general and of Islam in particular. Cragg has been a leading exponent of a particular missionary approach to Islam, emphasizing that there is a 'mission to Islam' as much as a mission to Muslims. To this end he interprets Islam as pointing in its deepest meaning towards Christianity, a course which has aroused both admiration and opposition among Christians and Muslims alike. I attempt to show that his theology is strongly influenced by distinctive Anglican traditions, and nourished by one particular Arab Christian source. Cragg, however, resists any easy classification, and faces the accusation of theological evasiveness as well as hermeneutic sleight of hand. His writings show a remarkable consistency over thirty years and point to possibilities for reconciliation between deeply rooted religious antagonisms. A further significance of Cragg is his awareness of contemporary secularity in its interaction with and impact upon religious belief. Here again his conviction that the deepest convictions of unbelief are at heart religious needs to be tested. The central question is whether he illegitimately 'christianises' Islam, and by extension, other faiths and ideologies. His keyword is 'retrieval', but there are attitudes and beliefs that cannot be retrieved, only abandoned. Few would quarrel with the ethics he advocates, but the question remains whether his theological method can be accepted as valid
Increasing lamb survival in Prince Edward Island sheep flocks
No full textThe overall objective of this program of research was to describe patterns in lamb mortality in sheep flocks in Prince Edward Island (PEI), Canada, and to identify the most influential flock-level factors associated with lamb mortality risk. Data were collected retrospectively from 385 lamb post-mortem submissions (2005 to 2014), and prospectively over one year for 51 distinct lambing groups from 37 sheep flocks. The retrospective data revealed the importance of infectious causes of lamb mortality in PEI sheep flocks. The prospective data revealed that the mean group-level lamb mortality was 11.14% (± 6.64%), with 25 groups having lamb mortality greater than 10%, which is considered higher than acceptable. The following management factors most strongly contributed to decreased lamb mortality: using flock management goal-setting; seeking veterinary advice for medical treatment; using benzimidazole-derivative anthelminthics; feeding higher quality forage (higher crude protein, digestible energy, net energy for maintenance, and lower acid detergent fiber), applying visual lamb identification, feeding a coccidiostat to lambs, administering clostridial vaccination to lambs, and avoiding separation of hypothermic lambs from their dams. A history of neurological problems in ewes contributed to increased mortality in lambs. Gastrointestinal parasite infections, and selenium and vitamin E deficiencies, were widespread in the study flocks. These research findings suggest that, to improve lamb survival in PEI flocks, producers should work with their veterinarians to set flock performance goals, enhance the nutritional management of late-gestation ewes, and improve the preventative health management of ewes and lambs, especially related to gastrointestinal parasitism and infectious diseases
Benchmark of lamb quality in U.S. retail and foodservice markets
No full textQuality is an accumulation of attributes that satisfy customer preferences and expectations. Lamb quality is a moving target that means different things to the supply chain and sheep/lamb industry stakeholders. The objectives of this research were to determine the rank, definition, relative preference, and willingness to pay (WTP) for seven quality attributes and quantify product attributes of lamb at U.S. retail markets. Structured interviews of retail and foodservice respondents were conducted from May 2014 to March 2015 via face-to-face or telephone with lamb/protein purchaser representatives of retail (n = 60), foodservice (n = 45), and purveyor (n = 15) marketing sectors. Shares of preference (relative percentage of preference) in best/worst evaluation for all interviews indicated that eating satisfaction (38.9%) was the most important attribute. Shares of preference for all seven specified quality attributes were statistically different from each other (P 0.05). Additionally, this research indicated that lamb loin and rib chops purchased at U.S. retail markets originating from U.S. lamb were the most muscular. Loin eye area of loin chops from U.S. origin were greater (19.55 cm2) than Australian chops (16.77 cm2), and chops from New Zealand (14.52 cm2) were the least muscular (P < 0.05). Also, Australian lamb (0.64 cm) had a trimness advantage of external fat of loin chops compared to lamb originating from either the U.S (0.84 cm) or New Zealand (0.86 cm; P < 0.05). Lamb producers should strive to place a strategic emphasis on quality attributes identified in this research to ensure eating satisfaction and lamb flavor are optimized for American Lamb, and to produce lamb with product authenticity attributes requested by retail and foodservice sectors, and inevitably American lamb consumers. An important application of the research included the development of an American lamb quality mission to: improve the consistency of quality, cutability, and marketability of American lamb with a consumer driven focus. The final phase of this project was a sheep/lamb industry strategy workshop that identified goals to: 1) Address factors contributing to lamb flavor, their impact on consumer satisfaction, and align flavor characteristics with target markets; 2) Improve lamb management to hit market-ready targets for product size, composition, and eating satisfaction while reducing production costs; and 3) Identify and capitalize on market opportunities for American lamb. A continuous improvement mentality is essential to lamb quality management throughout the supply chain in order to maintain (and increase) market share and demand for American lamb
ECONOMICS OF THE FOOD ANIMAL INDUSTRY IN THE U.S.
No full textThis paper has the objective of describing briefly the food animal industry in the U.S. from an economic perspective so as to aid in the subsequent identification of critical research needs relating to production, marketing and distribution. It focuses on beef, pork, lamb-mutton and poultry meats produced from human consumption. In addition it considers two other major animal product food sources, dairy products and eggs.Livestock Production/Industries,
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