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Journal articles on the topic "Plumbers and designer"
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Bega, Anna G., Denis N. Loginov, Mikhail I. Gordeev, et al. "On the expansion of the ecological niche of the hollow malaria mosquito Anopheles plumbeus Stephens, 1828 in Russia and Belarus." Vestnik Tomskogo gosudarstvennogo universiteta. Biologiya, no. 69 (2025): 9–19. https://doi.org/10.17223/19988591/69/2.
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The malaria mosquito, Anopheles plumbeus Stephens, 1828, is the only species in Europa, capable of transmitting the pathogen of the most deadly tropical malaria. Until recently, it was considered a species that rarely attacks humans, is confined to broadleaved forests and does not form high-density populations. The aim of the present work was to study changes in the ecological preferences and geographical distribution ofAn. plumbeus in Russia and Belarus. Our team studied breeding sites and collected An. plumbeus in natural and anthropogenic habitats between 2017 and 2024. Species affiliation was determined by morphological parameters, using standard keys. A part of randomly selected individuals from each sample was subjected to molecular genetic analysis. We obtained fragments of ITS2 ribosomal DNA sequence and BOLD-fragments of mitochondrial gene coxl. We developed primers for molecular genetic identification of An. plumbeus using the Primer3 programme (https://primer3.ut.ee/). ITS2 sequence fragments of An. plumbeus ribosomal DNA were obtained from primers of 5,8S (5'-TGTGAACTGCAGGACACAT-3') and 28S (5'-ATGCTTAAATTTAGGGGGTA-3'). BOLD fragments of the mitochondrial cox1 gene of An. plumbeus were obtained using our designed primers An.pl_F (5'-TTTCAACAAA TCATAAGGATATTGG-3') and An.pl_R (5'-TATACTTCTGGGTGTCCAAAA AATCA-3'). Until 2019, we found An. plumbeus larvae only in natural brood sites such as fallen large leaves, old stumps, forks and tree hollows. Starting from 2019, we started to find An. plumbeus larvae in urbanized areas. The number of detected brood sites in anthropogenic habitats increased from year to year: in 2019, 1; 2020, 6; 2021, 14. - 6; 2021 - 14; 2024 - 50. Some populations of An. plumbeus have retained their predilection for laying eggs in tree hollows in urban parks and alleys. Other populations in urbanised areas began to lay eggs only in containers of anthropogenic origin. In 2024, as a result of an expedition, we confirmed the presence of An. plumbeus in the Republic of Belarus. An. plumbeus larvae were found in a car tyre in the city park in Mogilev on the border of broad-leaved forest.Together with changes in preferences for choosing egglaying sites, we observe changes in behavioural preferences for selecting a feeder. In 2020 and 2021, we captured 2 and 4 adults of An. plumbeus on our own during 30 minutes of counting, respectively. All captured adults swarmed without attack. In a similar survey in 2024, we captured 8 adults, including 5 attacking females and 3 males. We believe that the observed transition to synanthropic existence of An. plumbeus mosquitoes may be a prerequisite for the formation of potentially invasive populations in the future. By transitioning to synanthropic existence, the population gets rid of a number of biotopic constraints that determine its range. Previously, the range of An. plumbeus was highly fragmented due to its attachment to humid broadleaved forests. The limited number of larval habitats, low humidity and seasonal irregularity of precipitation may have acted as factors limiting the population size of this species. The large number of potential breeding sites for An. plumbeus clutches, high humidity in many areas where irrigation systems are developed, and the presence of a large number of people as potential feeders are present in urbanised environments. Synanthropisation has allowed the species to expand its ecological niche, spread beyond its native range, which was previously restricted to broadleaved forests, and greatly increase its numbers. The observed transformation of the ecological niche of An. plumbeus is similar to the changes that occurred in a number of mosquito species of the genus Aedes of the subgenus Stegomyia. We believe that synanthropization involves a sustained change in biotopic preferences that presumably has a genetic basis. The data obtained on the ecological preferences of An. plumbeus require reconsideration of the status of the species as a potential vector of tropical malaria and attention of anti-epidemiological services to this species. The Authors declare no conflict of interest.
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Campbell, John Y. "AN INTERVIEW WITH ROBERT J. SHILLER." Macroeconomic Dynamics 8, no. 5 (2004): 649–83. http://dx.doi.org/10.1017/s1365100504040027.
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A recent article in The Economist magazine divided economists into “poets” and “plumbers,” the former articulating radical new visions of the field and the latter patiently installing the infrastructure needed to implement those visions. Bob Shiller is the rare economist who is both poet and plumber. Not only that, he is also entrepreneur and pundit. His work has fundamentally changed the theory, econometrics, practice, and popular understanding of finance.Starting in the late 1970's, Bob boldly challenged the prevailing orthodoxy of financial economics. He showed that financial asset prices often deviate substantially from the levels predicted by simple efficient-markets models, and he developed new empirical methods to measure these price deviations. In the early 1980's, Bob went on to argue that economists need a much more detailed understanding of investor psychology if they are to understand asset price movements. He pioneered the emerging field of behavioral economics and its most successful branch, behavioral finance. At the end of the century, Bob articulated his vision of finance in a wildly successful popular book,Irrational Exuberance. He became so well known that TIAA-CREF asked him to appear in a series of full-page advertisements in the popular press.Although Bob does not believe that investors use financial markets in a perfectly rational manner, he does believe that these markets offer great possibilities to improve the human condition. His recent work asks how existing financial markets can be used, and new financial markets can be designed, to improve the sharing of risks across groups of people in different regions, countries, and occupations. He has explored risk-sharing possibilities not only in journal articles, but also in business ventures and a 2003 book,The New Financial Order: Risk in the 21st Century.It was a great privilege for me to interview Bob Shiller. Bob's arrival at Yale when I was a Ph.D. student there set the course of my career as an economist. Bob reinvigorated the Yale tradition of macroeconomics, with its emphasis on the central role of financial markets in the macroeconomy and its idealism about the possibility of improving macroeconomic outcomes. First as a thesis adviser, then as a coauthor, mentor, and friend, Bob showed me how to contribute to this tradition.The interview took place at the 2003 annual meetings of the Allied Social Science Associations in Washington, D.C. We met in a hotel suite, ate a room service meal, and had the enjoyable conversation that is reproduced below.
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Lokesh, S. Sriram. "All Served Service." International Journal for Research in Applied Science and Engineering Technology 13, no. 6 (2025): 1013–15. https://doi.org/10.22214/ijraset.2025.72239.
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This project is all about making home services... less painful. Imagine this—you’ve got a leaking pipe, wires acting weird, or your washing machine suddenly gives up. What do you do? Scroll through contacts? Call random numbers? Nah. This web app got you. Built using HTML, CSS, JavaScript, Django, and SQLite. It brings together customers and service providers—like plumbers, electricians, cleaners, and repair experts—on one simple platform. Register quickly. Book a service. Done. The app handles everything. Real-time service updates, secure logins, smooth UI. It’s like the modern version of calling the handyman, but without the wait or the guesswork. It’s formal where it should be. Chill when it can be. Designed to be scalable, easy to use, and just... smart. The goal? Digitalize the old ways. Make home services faster, easier, and a whole lot better. No more stress. Just help—when you need it.
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Delima, David John Eliezar, and Phoebe Trio. "Method validation for protein quantitation of fish muscle tissues from Lake Taal, Batangas." KIMIKA 30, no. 2 (2019): 5–16. http://dx.doi.org/10.26534/kimika.v30i2.5-16.
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Lake Taal is one of the largest producers of inland fish in the Philippines and has one of the largest freshwater wet markets in Luzon. These unregulated wet markets sell fishes in unreasonable prices and thereby, exploit the knowledge of consumers on the validity of the prices. This study was designed to quantify the proteins in fish muscle tissues and to validate the effectivity of the various protein quantitation methods. Twelve different species of fish samples were freshly collected from Lake Taal. Muscle tissues were removed and lyophilized before subjecting to comparative protein quantitation methods using direct photometry, ovalbumin assay, and Bradford’s assay. These techniques were selected due to their accessibility and the use of photometry for quantitation. The results show that the means were significantly different for all the methods according to ANOVA. These results were confirmed with post-hoc Tukey HSD test, Scheffe test, and Bonferroni and Holm multiple comparison (BHMC) tests with p < 0.01. Bradford’s Assay was the ideal method with an RSD of less than 1% for all the samples, with no negative concentrations, and with concentration ranging from fifteen to twenty percent. P. leopardus had the highest amount of proteins, followed by M. cephalus, L. plumbeus, C. chanos, H. quoyi, and A. semipunctata. Interestingly, the study revealed that O. niloticus, which is one of the species with a high market price had the lowest protein concentration. With these results, the lowly commercialized fishes such as M. cephalus, L. plumbeus, H. quoyi, and A. semipunctata which are used as gamefish, fish bait, and aquarium displays should be commercialized more than the unstable populations of P. leopardus and C. chanos. Overall, this study revealed comparative information on protein quantitation methods, and market price-nutritional values correspondence.
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Toirov, M., and S. Shavkidinova. "ACHIEVING ENERGY SAVINGS IN PERFORMING HOLE DRILLING ON MAIN WATER PRESSURE PIPES." Danish scientific journal, no. 64 (September 27, 2022): 61–65. https://doi.org/10.5281/zenodo.7140144.
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<strong>Abstract</strong> The main goal of the presented article is to optimize the possibilities of replacing outdated pipeline networks of existing enterprises in our republic, to improve time and quality indicators, and to ensure continuous production process. Creation of a hole-drilling device for connecting an additional pipeline network to surface and underground low-pressure water, oil and gas pipelines passing through the territory of our republic, designing and testing the project in practice, theoretically and mathematically analyzing the parameters of all indicators during the testing process, and finding more optimal method is provided by the current project. In order to prevent the negative effect of the water leaking from the pipe on the welds during the connection of the newly connected low-pressure small-diameter pipe to the low-pressure large-diameter pipes, resulting in the defective bridging of the crystal lattices of the welds. The article mainly provides theoretical information on creating a dry, comfortable workplace for plumbers who repair and install pressure pipes in cold periods of the year.
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Wilderer, P. A., and D. Schreff. "Decentralized and centralized wastewater management: a challenge for technology developers." Water Science and Technology 41, no. 1 (2000): 1–8. http://dx.doi.org/10.2166/wst.2000.0001.
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The traditional wastewater management concept (urban wastewater collection system plus treatment of the wastewater in a central treatment plant) has been successfully applied over many decades in densely populated areas of industrialized countries. Whether this technology is of ultimate wisdom must be questioned, especially considering the urgent need for improved sanitary infrastructures in developing countries. The problem is that the costs for implementing a centralized system in mega-cities, in particular the investment costs for the sewer system, are exorbitant. Decentralized wastewater management systems, with the wastewater treated close to where it is generated, are being considered by various researchers and institutions including the World Bank as an alternative to the traditional centralized system. The degree of technological sophistication that should be applied is under dispute, however. In this paper, we advocate development and application of high-tech on-site treatment plants, designed and fabricated by modern industrial methods. When mass produced, the costs for manufacturing such package plants can presumably be kept at a relatively low level. The plants should be delivered in a “user ready” state. Local plumbers may connect toilet bowls and sinks and washing machines, but may not be involved in the manufacturing of the treatment system. The plant should produce an effluent which is hygienically safe and can subsequently be utilized for toilet flushing, washing clothes, cleaning floors or watering lawns. In order to keep the plants operating properly, they should controlled by remote sensing, and maintained by specialized service enterprises. The conceptual design of such a compact plant is discussed in the form of a case study.
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Walker, Terence I. "Can shark resources be harvested sustainably? A question revisited with a review of shark fisheries." Marine and Freshwater Research 49, no. 7 (1998): 553. http://dx.doi.org/10.1071/mf98017.
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Sharks and other chondrichthyans are often described as long lived, slow growing and producing few offspring. These biological characteristics, together with the common assumption that recruitment is directly related to stock, and pessimistic stock prognoses obtained from application of demographic analysis, have led to doubts that sharks can be harvested sustainably. Developed over the past 40 or so years from studies of only a few shark species, these doubts have been reinforced by declining catch rates in industrial, artisanal and recreational fisheries and in fishing programmes designed to reduce the risk of sharks attacking humans at bathing beaches. However, more recent studies and application of modelling techniques allowing for density-dependent responses to the effects of stock reduction indicate that shark stocks can be harvested sustainably and, if carefully managed, can provide very stable fisheries. It is now understood that some species (such as Galeorhinus galeus, Carcharhinus plumbeus, Carcharodon carcharias and several species of dogfish) have low productivity, whereas other species (such as Mustelus antarcticus, Rhizoprionodon terraenovae, Sphyrna tiburo and Prionace glauca) have higher productivity. This paper reviews the use of shark products, the effects of fishing on shark populations of the world, and recent developments in assessment of shark fishery stocks.
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Pirog, Agathe, Sébastien Jaquemet, Antonin Blaison, Marc Soria, and Hélène Magalon. "Isolation and characterization of eight microsatellite loci fromGaleocerdo cuvier(tiger shark) and cross-amplification inCarcharhinus leucas, Carcharhinus brevipinna,Carcharhinus plumbeusandSphyrna lewini." PeerJ 4 (May 17, 2016): e2041. http://dx.doi.org/10.7717/peerj.2041.
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The tiger sharkGaleocerdo cuvier(Carcharhinidae) is a large elasmobranch suspected to have, as other apex predators, a keystone function in marine ecosystems and is currently considered Near Threatened (Red list IUCN). Knowledge on its ecology, which is crucial to design proper conservation and management plans, is very scarce. Here we describe the isolation of eight polymorphic microsatellite loci using 454 GS-FLX Titanium pyrosequencing of enriched DNA libraries. Their characteristics were tested on a population of tiger shark (n= 101) from Reunion Island (South-Western Indian Ocean). All loci were polymorphic with a number of alleles ranging from two to eight. No null alleles were detected and no linkage disequilibrium was detected after Bonferroni correction. Observed and expected heterozygosities ranged from 0.03 to 0.76 and from 0.03 to 0.77, respectively. No locus deviated from Hardy-Weinberg equilibrium and the globalFISof the population was of 0.04NS. Some of the eight loci developed here successfully cross-amplified in the bull sharkCarcharhinus leucas(one locus), the spinner sharkCarcharhinus brevipinna(four loci), the sandbar sharkCarcharhinus plumbeus(five loci) and the scalloped hammerhead sharkSphyrna lewini(two loci). We also designed primers to amplify and sequence a mitochondrial marker, the control region. We sequenced 862 bp and found a low genetic diversity, with four polymorphic sites, a haplotype diversity of 0.15 and a nucleotide diversity of 2 × 10−4.
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Best, M. J., G. Abramowitz, H. R. Johnson, et al. "The Plumbing of Land Surface Models: Benchmarking Model Performance." Journal of Hydrometeorology 16, no. 3 (2015): 1425–42. http://dx.doi.org/10.1175/jhm-d-14-0158.1.
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Abstract The Protocol for the Analysis of Land Surface Models (PALS) Land Surface Model Benchmarking Evaluation Project (PLUMBER) was designed to be a land surface model (LSM) benchmarking intercomparison. Unlike the traditional methods of LSM evaluation or comparison, benchmarking uses a fundamentally different approach in that it sets expectations of performance in a range of metrics a priori—before model simulations are performed. This can lead to very different conclusions about LSM performance. For this study, both simple physically based models and empirical relationships were used as the benchmarks. Simulations were performed with 13 LSMs using atmospheric forcing for 20 sites, and then model performance relative to these benchmarks was examined. Results show that even for commonly used statistical metrics, the LSMs’ performance varies considerably when compared to the different benchmarks. All models outperform the simple physically based benchmarks, but for sensible heat flux the LSMs are themselves outperformed by an out-of-sample linear regression against downward shortwave radiation. While moisture information is clearly central to latent heat flux prediction, the LSMs are still outperformed by a three-variable nonlinear regression that uses instantaneous atmospheric humidity and temperature in addition to downward shortwave radiation. These results highlight the limitations of the prevailing paradigm of LSM evaluation that simply compares an LSM to observations and to other LSMs without a mechanism to objectively quantify the expectations of performance. The authors conclude that their results challenge the conceptual view of energy partitioning at the land surface.
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Versteirt, V., S. Boyer, D. Damiens, et al. "Nationwide inventory of mosquito biodiversity (Diptera: Culicidae) in Belgium, Europe." Bulletin of Entomological Research 103, no. 2 (2012): 193–203. http://dx.doi.org/10.1017/s0007485312000521.
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AbstractTo advance our restricted knowledge on mosquito biodiversity and distribution in Belgium, a national inventory started in 2007 (MODIRISK) based on a random selection of 936 collection points in three main environmental types: urban, rural and natural areas. Additionally, 64 sites were selected because of the risk of importing a vector or pathogen in these sites. Each site was sampled once between May and October 2007 and once in 2008 using Mosquito Magnet Liberty Plus traps. Diversity in pre-defined habitat types was calculated using three indices. The association between species and environmental types was assessed using a correspondence analysis. Twenty-three mosquito species belonging to traditionally recognized genera were found, including 21 indigenous and two exotic species. Highest species diversity (Simpson 0.765) and species richness (20 species) was observed in natural areas, although urban sites scored also well (Simpson 0.476, 16 species). Four clusters could be distinguished based on the correspondence analysis. The first one is related to human modified landscapes (such as urban, rural and industrial sites). A second is composed of species not associated with a specific habitat type, including the now widely distributed Anopheles plumbeus. A third group includes species commonly found in restored natural or bird migration areas, and a fourth cluster is composed of forest species. Outcomes of this study demonstrate the effectiveness of the designed sampling scheme and support the choice of the trap type. Obtained results of this first country-wide inventory of the Culicidae in Belgium may serve as a basis for risk assessment of emerging mosquito-borne diseases.
Books on the topic "Plumbers and designer"
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Brown, Paul Geoffrey. Object-relational database development: A plumber's guide. Prentice Hall, 2001.
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Publishing, Nifty Log Book. Plumber Client Data Log Book: Best Client Record Log Book to Keep Track Your Plumber Client Data - Client Address Book for Plumber, Plumber Business Owner, Plumber Home Repairs, Plumbing Designer. Independently Published, 2020.
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Publishing, Nifty Log Book. Plumber Client Data Log Book: Personal Client Profile Log Book to Keep Track Your Plumber Client Data - Client Record Binder for Plumber, Plumber Business Owner, Plumber Home Repairs, Plumbing Designer. Independently Published, 2019.
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M. E. D. Graph Créativités. Architect Graph Book: Isometric Paper Pad, Architecture Tool, Designers, Artists Graph Paper, Plumbers Book, Engineering and Construction, Notebook for Sketching, 3D Practicing, 8. 5 X 11 Inch. Independently Published, 2021.
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Casa x: Due sposi, moglie e marito, il commerciante di legnami, l'idraulico, sei famiglie, un farmacista, del millenovecentosessanta, due giovani coppie, due farmacisti, la compagna di banco, una sorella, la single, il figlio dell'idraulico, la mia famiglia = House for : the newly weds, the husband and wife, the wood merchant, the plumber, six families, the chemist, from 1960, two young couples, two chemists, a colleague, a sister, a single, the plumber's son, my family. Alinea, 2004.
Find full textBook chapters on the topic "Plumbers and designer"
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Caguay, Marjun E. "Design, Fabrication, and Performance Evaluation of Ayungin (Leiopotherapon Plumbeus) Smoke Dryer." In Advancing Sustainable Science and Technology for a Resilient Future. CRC Press, 2024. http://dx.doi.org/10.1201/9781003490210-86.
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Frankel, Noralee. "Aging Gracefully in Public." In Stripping Gypsy. Oxford University PressNew York, NY, 2009. http://dx.doi.org/10.1093/oso/9780195368031.003.0020.
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Abstract In 1961, Gypsy bought a seventeen-room mansion situated on two acres at 1240 Cerrocrest Drive in Beverly Hills. She paid $63,500 for it and was convinced that she had made a good buy. Built in the 1920s on one of the highest sites in the city, the house was some seventy-five feet above the street and was reached by steep steps. Gypsy wisely built a retaining wall and placed tall cypresses in front. She chose the house in California because she adored its breathtaking view at night and the spaciousness inside. She teasingly referred to it as “early Sunset Boulevard”—a self-conscious parody of the movie about a reclusive former silent film actress’s inability to cope with her aging. But the house required a great deal of remodeling to make it livable. She knew she had her work cut out for her to transform the place into her home. She hired ironworkers, plumbers, and gardeners and an interior designer, Jane Ashley. Even as she labored to give it her own style, she found the setting relaxing. Outside, Gypsy puttered relentlessly and with great satisfaction in her garden, which contained a small moat stocked with fish. Inside, she cleaned to the point of bleeding knuckles and broken fingernails.
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Vargas-Bernal, Rafael. "Role of Two-Dimensional Nanomaterials in Electrodes for Rechargeable Batteries and Supercapacitors." In Innovations in Materials Chemistry, Physics, and Engineering Research. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-6830-2.ch010.
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It has become urgently necessary to develop energy storage technologies and materials due to the rising need for advanced sustainable energies. Among the emerging advances in materials chemistry is the research and development of new electrode materials for rechargeable batteries and supercapacitors. To increase their energy density, service life, specific power, charge and/or discharge capacity, and environmental friendliness, electroactive electrode materials with high surface areas and redox-active mediators are essential. Two-dimensional materials such as MXenes, Xenes, phosphorene, silicene, siloxane, stanene, arsenene, plumbene, bismuthene, antimonene, metallenes, metal-organic frameworks (MOFs), and other materials are being investigated to optimize their performance for various implementations of rechargeable batteries and supercapacitors. This chapter discusses recent progress and future challenges in the design of two-dimensional materials for electrodes of electrochemical energy storage devices.
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Ferguson, R. Brian. "The Second Generation." In Chimpanzees, War, and History. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197506752.003.0002.
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Abstract This chapter cites E.O. Wilson’s extremely influential and controversial book from the 1980s, Sociobiology: The New Synthesis. It talks about the inclusive fitness theory, which explained many aspects of animal and human behavior as strategies designed by evolution to maximize an individual organism’s genes in future generations. It also points out how Jane Goodall’s findings were not inconsistent with the emerging field of sociobiology, as she found it pointless to deny that humans harbor innate aggressive and violent tendencies. The chapter highlights the spread of the perspective on the evolutionary rationale behind “demonic males,” explaining how it plumbed the roots of social structure by seeking to explain it as a result of adaptations to maximize the reproductive success of the social individual. It reviews the main theory of chimpanzee violence and methodology that focused on formulating and testing narrow hypotheses.
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Hamilton, Jennifer A. "Alexa, Disability, and the Politics of Things Not Apprehended." In Technocreep and the Politics of Things Not Seen. Duke University Press, 2025. https://doi.org/10.1215/9781478060239-012.
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This chapter considers how technologies like Amazon’s Alexa are imagined, designed, and realized through entanglements with surveillance culture, the politics of big data, and shifting modes of production, consumption, and disposal in neoliberal capitalism. Such technologies also reflect long entanglements with racialized and gendered labor, planetary degradation, and a deep cultural desire for technofixes that project disability-free futures. Yet they also offer new possibilities for disabled people, especially in terms of reorganizing the putatively private space of the home to expand other relational potentialities in and beyond this space. This chapter plumbs the idea of technocreep in this context, focusing simultaneously on the embodied creative labor required to make technologies like the Alexa speak to the lives, needs, and desires of disabled people in the United States, as well as on the larger affective politics of living and being with artificial intelligence.
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"Shark Nursery Grounds of the Gulf of Mexico and the East Coast Waters of the United States." In Shark Nursery Grounds of the Gulf of Mexico and the East Coast Waters of the United States, edited by CAMILLA T. MCCANDLESS, HAROLD L. PRATT, NANCY E. KOHLER, REBEKA R. MERSON, and CONRAD W. RECKSIEK. American Fisheries Society, 2007. http://dx.doi.org/10.47886/9781888569810.ch4.
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<em>Abstract.</em>—Delaware Bay is one of two principal nursery grounds for the sandbar shark <em>Carcharhinus plumbeus </em>in United States coastal waters, with the second one located in Chesapeake Bay. Tagging studies were conducted for juvenile sandbar sharks in Delaware Bay during their summer nursery seasons from 1995 to 2000 using gill-net (1995–2000) and longline (1997–2000) gears. These studies were designed to aid fishery managers in defining essential fish habitat for juvenile sandbar sharks tagged in Delaware Bay by determining spatial and temporal distributions, overwintering grounds, and philopatry to natal nursery areas. A total of 2,066 juvenile sandbar sharks were caught in Delaware Bay from 1995 to 2000, and 87% of the sharks sampled were tagged before release. Of these tagged sharks, 156 (9%) have been recaptured through 2005. Juvenile sandbar sharks were most abundant along the Delaware coast, with more localized abundances on the shoal areas throughout the bay. Recaptures indicate that the majority of sandbar sharks born in Delaware Bay return to their natal nurseries for up to 5 years following birth (and potentially up to 12 years of age), overwinter off North Carolina, and eventually expand their range south to the east coast of Florida and into the Gulf of Mexico as they get larger. This study also provides the first evidence of mixing between the juvenile sandbar shark populations of Delaware and Chesapeake Bays during the summer nursery season.
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May, Robert M., and Michael J. Crawley. "Communities: patterns." In Theoretical Ecology. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780199209989.003.0012.
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In all areas of ecology, from studies of individual organisms through populations to communities and ecosystems, there have been huge empirical and theoretical advances over the past several decades. Our guess—a testable hypothesis—is that the worldwide research community of ecologists has grown by roughly an order-of-magnitude since the 1960s, as is of course true for other areas of the life sciences. One consequence is that it is harder to put together a book like the present one. And we find it especially hard when we compare this chapter on community patterns with the corresponding chapter in the second edition of Theoretical Ecology. For the chapters on single populations, for example, there has been growth both in understanding the nonlinear dynamical phenomena that can arise, along with a host of well-designed field and laboratory experiments which illustrate these processes. The narrative, however, retains a unifying central thread, and much of the task of overview and compression lies in choosing good examples from an increasing panoply of choice. For communities, on the other hand, we find so many different yet intersecting areas of growth, many of which have recently produced booklength collections of papers, that the task of choosing which topics to emphasize and which to elide is invidious. The result is necessarily quirky. Without further apology, here is an outline. One broad area of community ecology deals with models for the dynamical behaviour of collections of many interacting species—either within a single trophic level or more generally—essentially as a scale-up of models for single and pairwise- interacting populations. This was the subject of the preceding chapter. Here, we begin by emphasizing the importance of work which views communities from, as it were, a plumber’s perspective, looking at patterns of flow of energy or nutrients or other material. But we then move on quickly to other topics. These include: the network structure of food-webs (connectance, interaction strengths, etc.); what determines species’ richness (niche versus null models); relative abundance of species (observed patterns and suggested causes); succession and disturbance; species–area relations; and scaling laws (with suggested connections among some such laws).
Conference papers on the topic "Plumbers and designer"
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Tudor, Andrew H., and Kim R. Mniszewski. "The Nuisance Fire Problem With Acetylene B Cylinders." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0705.
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Abstract On November 19, 1992, a three-story, twenty-two unit condominium project in the Los Angeles area was consumed by fire. The structure, in the framing stages of construction, burnt to the ground. Several adjoining structures sustained varying degrees of fire damage. The fire was caused by a golf ball-sized fire emanating from the threaded connection in a plumber’s air/acetylene piping system, caused by a leak at the threaded connection between the acetylene B tank and the regulator. Unfortunately, a small nuisance fire in this area can quickly become a dangerous and unmanageable fire upon operation of the (safety) fusible plug, which is proximate to this connection. Results of literature searches and reviews of appropriate industry standards indicate that this valve site is prone to these “nuisance” fires. Analysis of other sizes of acetylene tanks indicate a design philosophy significantly different from that used for the subject B tank. These design differences have profound safety implications. Results of analysis and testing of conventional acetylene B tanks have demonstrated inherent defects and have identified existing designs that eliminate these defects. A complete analysis addressing human factors, standards, mechanical, and thermal design issues is presented. Testing further supported and validated the analytical models where necessary. The ultimate objective is to design an acetylene tank which can sustain human error, allow for a means to eliminate or control the nuisance fire and can demonstrate superior fire performance. An alternative design was identified that achieves this. Changes to DOT and CGA standards regarding such tanks are recommended.
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Bernardin, John D., Snezana Konecni, and Roger Wiens. "Design and Testing of a Prototype Atmospheric Gas Collection Apparatus for a Mission to Mars." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14499.
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A novel spacecraft, the Sample Collection for Investigation of Mars (SCIM), was proposed for the collection and return of atmospheric gas and dust samples from the martian atmosphere. The SCIM mission, part of NASA's Mars Exploration Strategy, would allow scientists to greatly enhance our understanding of Mars' water, climate, and geological evolution by studying the element and isotopic composition of the gas and dust. The SCIM spacecraft was proposed to collect its samples during a single high-speed pass through the martian atmosphere at an altitude of 37 km and return the samples back to earth. For the atmospheric gas sampling aspect the SCIM employs the Atmospheric Collection Experiment (ACE), a dual-component apparatus consisting of a passive and a cryogenic sorption gas collection system. Each of these systems possesses a collection vessel that is initially under high vacuum. At the time of entry into the martian atmosphere, valves on SCIM open and gas flows into the parallel-plumbed passive and cryogenic sorption gas collection systems. The passive system simply allows the incoming gas to fill an initially evacuated 1 Liter vessel. The cryogenic sorption system employs a Joule-Thompson cryocooler and sorption medium that initially condenses and captures the incoming gas. As the SCIM begins to exit the atmosphere isolation valves close and trap the gas samples in their collection systems for the return journey back to earth. The minimum SCIM mission goal was to collect 100 cm3 @STP(≈ 0.2 g) of martian atmospheric gas and the ACE was being designed to gather 1000 cm3 @STP (≈ 2.0 g) using both the passive and cryogenic systems. The volumes referred to above correspond to standard temperature and pressure on Earth (e.g., STP). The goals of this study were to prove the gas collection concepts mentioned above and develop the numerical and experimental tools to allow for the optimization of a flight worthy ACE. This paper discusses the design, analysis, and testing of a prototype ACE. First, more specific details on the design and testing methodology for the prototype are presented. Next, the development of a computational fluid dynamics (CFD) model is discussed. Finally, empirical pressure data from the prototype tests are used to assess the performances of the passive and cryogenic sorption gas collection systems and are compared to numerical pressure predictions to provide a benchmark for the CFD model. Results indicate that the prototype ACE is capable of meeting the design goal of 1000 cm3 @STP (2.0 g) of total gas collection.
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Valentim, Juliana. "Participatory Futures Imaginations." In LINK 2021. Tuwhera Open Access, 2021. http://dx.doi.org/10.24135/link2021.v2i1.111.
Full textAbstract:
The contemporary conjuncture of widespread ecological and social crises summons critical thinking about significant cultural changes in digital media design. The selection and classification practices that marked the history of slavery and colonization now rely on all types of nanotechnologies. On behalf of the future, bodies became expanded territory to sovereign intervention, where the role of contemporary powers enable extraction and mining of material, plumbed from the most intimate sphere of the self. This logic requires the state of exception to become the norm, so that the crisis is the digital media’s critical difference: they cut through the constant stream of information, differentiating the temporally valuable from the mundane, offering users a taste of real-time responsibility and empowerment. Thereby, this research aims to explore the dynamic transformations of the mediatic environment and their impacts on the fundamental relationships of human beings with the world, the self, and objects. It unfolds concerns around neocolonial assaults on human agency and autonomy that resonate from structuring patterns emerging from the digital infrastructure of neoliberalism and the relationships of human beings with the world. It disputes the imaginaries, representational regimes, and the possibilities of reality perceptions with universal, patriarchal, and extractive representations. This research also seeks alternative forms of media education and political resistance through its collaborative practice, pursuing an attentive and open-ended inquiry into the possibilities latent for designing new communication and information tools within lived material contexts: How might we represent invisible media infrastructures? How to produce knowledge about this space and present it publicly? How can these representations be politically mobilized as ecological and social arguments to establish a public debate? How can artistic sensibilities, aesthetics and the visual field influence what is thought of this frontier space? Finally, how can art, play and research intervene and participate? For this, the project involves participatory methods to create spaces for dialogue between different epistemologies, questioning the forms of ethical and creative reasoning in the planetary media and communication systems; for fostering the techno-politics imagination through playful, participatory futures and transition design frameworks as an ethical praxis of world-making; and for a reconceptualization of autonomy as an expression of radical interdependence between body, spaces, and materiality. The research aims to provide a framework for designing media tools, which incorporates core design principles and guidelines of agency and collective autonomy. It also engages with the transnational conversation on design, a contribution that stems from recent Latin American epistemic and political experiences and struggles, and the wider debate around alternative forms of restoring communal bonds, conquering public discussion spaces, and techno-political resistances through collaborative research practices and participatory methods.