Literatura científica selecionada sobre o tema "Bear with colander on head"
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Artigos de revistas sobre o assunto "Bear with colander on head"
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Hayashi, Yasuhiko, Hironori Fujisawa, Yasuo Tohma, Junkoh Yamashita e Hideo Inaba. "Penetrating Head Injury Caused by Bear Claws: Case Report". Journal of Trauma: Injury, Infection, and Critical Care 55, n.º 6 (dezembro de 2003): 1178. http://dx.doi.org/10.1097/01.ta.0000025324.27227.d4.
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Thoman, Evelyn B., e Susan E. Graham. "Self-Regulation of Stimulation by Premature Infants". Pediatrics 78, n.º 5 (1 de novembro de 1986): 855–60. http://dx.doi.org/10.1542/peds.78.5.855.
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Premature babies are capable of seeking contact with a source of rhythmic stimulation that reflects their own breathing rhythm. Optional stimulation, in the form of a "breathing" stuffed bear, was made available to premature infants, 32 to 35 weeks' gestational age. The bear's breathing rate was matched to that of each individual infant during quiet sleep. Other infants were exposed to a bear that did not breathe, and some infants were not exposed to a bear. All infants were monitored continuously using time-lapse video. After 2 to 3 weeks' exposure, those infants with a breathing bear-showed significantly more contact with their head, body, or limbs than either of the control groups (for the no-bear group, contact with the area that would have been occupied by the bear was determined to describe the contact that might have been expected by chance). In addition, the infants given the opportunity to self-regulate their stimulation showed greater amounts of quiet sleep than the other two groups.
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Kennedy, John M. "Tom Thomson’s Islands, Canoe Lake, 1916: a rock as the head of a bear". Cognitive Semiotics 15, n.º 1 (1 de maio de 2022): 75–92. http://dx.doi.org/10.1515/cogsem-2022-2008.
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Abstract Tom Thomson is a doyen of Canadian art. Here, I argue one of his well-known pictures contains a hidden figure. In Thomson’s Islands, Canoe Lake, 1916, a blue-gray picture primitive richly affords a rock and a bear, a long-overlooked ambiguity, one that Thomson did not tell us he intended. Its picture primitives are contours and patches. They offer a limited set of scene primitives. A likelihood ratio of less than 1 in 100 supports the contention that the bear is a hidden figure.
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Roka, Yam B., Narayani Roka, Manzil Shrestha, Puspa R. Puri e Hari B. Adhikari. "Penetrating head injury with bilateral eye avulsion due to Himalayan bear bite". Emergency Medicine Australasia 24, n.º 6 (dezembro de 2012): 677–79. http://dx.doi.org/10.1111/1742-6723.12007.
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Gulyaev, V. I. "The Bear Cult and Kurgans of the Scythian Elite". Archaeology, Ethnology & Anthropology of Eurasia 47, n.º 3 (21 de setembro de 2019): 85–93. http://dx.doi.org/10.17746/1563-0110.2019.47.3.085-093.
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This study, based on artifacts from high-ranking kurgans of the northern Black Sea region (700–300 BC), addresses the little-studied bear motif in Scythian culture and its relevance for the ancient inhabitants of this region and of the adjacent territories. It is a wide-held view that the image of the brown bear had been borrowed from the Ananyino culture of the Kama. Variation of this motif is described and its chronology is assessed. Two principal iconographic versions are known in Scythian art—the animal is shown either en face, in the so-called sacrifi cial posture, or drinking (in profi le, with a bowed head). Such representations occur most often on gold-plated ritual bowls and ornaments of the horse harness. Both the chronology and the distribution range of these artifacts disagree with the idea that the bear motif was a loan from forest cultures. Rather, it appears to be inherently Scythian, having originated around 700 BC together with other images of the animal style. Apparently, some form of the bear cult was practiced by the Scythian elite.
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Shivaprasad, Doma, Medipally Surendar, S. Srinivas, Oleti Satyaveni, Chokkampeta Kavya, Mallikarjuna Rao Gundavarapu e Kseniia Iurevna Usanova. "Pro-tech head protector". MATEC Web of Conferences 392 (2024): 01065. http://dx.doi.org/10.1051/matecconf/202439201065.
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Solar-based E-Uniform furnished with better protection to the soldiers who are working in extreme weather. Solar Panels are wont to power up the interior circuitry of the E-uniform. A 12 V DC lead-acid rechargeable battery is employed for storing the energy. We are using a conventional battery charging unit also for giving supply to the circuitry. ATmega16a microcontroller is the heart of the circuit as it controls all the functions. The project is operated in two modes like summer mode and winter mode. By selecting the mode of operation, we are operating the system such that it can drive the body temperature according to heater/cooler. The heater/cooler in turn will help us to provide a cooling or warming effect inside the uniform which helps the soldier to bear any kind of external environment. The metal sensor will detect the metal-like bomb, any other planted weapon in-ground and intimate the soldier with a buzzer indication. The GSM is interfaced with the microcontroller and GPS is additionally interfaced such that the tracking of the whole soldier is observed. And the location is messaged to the particular concerned person /dept. This Uniform will make the soldier work in any kind of environment without any stress or distraction.
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LEIS, JEFFREY M. "Larval development in the lutjanid subfamily Lutjaninae (Pisces): the Indo-Pacific genus Pinjalo". Zootaxa 1760, n.º 1 (30 de abril de 2008): 37. http://dx.doi.org/10.11646/zootaxa.1760.1.3.
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The larvae of the two species of Pinjalo are described for the first time based on seven specimens of P. pinjalo (4.3–7.5 mm) and 23 specimens of P. lewisi (5.6–15.0 mm) captured in plankton tows and midwater trawls in the eastern Indian and western Pacific Oceans. Identification was confirmed by fin meristics. These deep-bodied, compressed larvae share all the characteristics of lutjanid larvae, and have some of the most well-developed head spination and fin spines of any lutjanids. The robust spines of the dorsal, anal and pelvic fins bear strong serrations. The preopercular spines are particularly enlarged, some bear fine serrations, and the anterior end of the maxilla also has fine serrations: these fine serrations are rare in lutjanine lutjanids. The two species of Pinjalo can be distinguished by the meristics of dorsal and anal fins, the relative lengths of the first spine of the dorsal fin and the spine of the pelvic fin. The larvae have distinctive pigment on the dorsal fin, head and caudal peduncle. The body shape, pigment pattern, fin-spine morphology, and the fine serrations on the head spines of the two Pinjalo species are very similar to the larvae of Lutjanus erythropterus and L. malabaricus, and may indicate a close relationship among these four species.
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Garcia-Macias, V., F. Martinez-Pastor, M. Alvarez, P. Paz, S. Borragan, M. Celada, E. Anel e L. Anel. "219 MORPHOMETRIC CHARACTERIZATION OF EPIDIDYMAL AND EJACULATED SPERMATOZOA FROM BROWN BEAR (URSUS ARCTOS)". Reproduction, Fertility and Development 18, n.º 2 (2006): 217. http://dx.doi.org/10.1071/rdv18n2ab219.
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Sperm morphology is an useful characteristic for estimating potential fertility. Currently, we are obtaining baseline information on various aspects of reproduction in the brown bear (Ursus arctos) with the intention of using the knowledge to establish a germplasm bank for the species. In the present report, we describe the results obtained using assisted sperm morphology analysis (ASMA, Sperm Class Analyzer®; Microptic S.L, Barcelona, Spain) to analyze the morphological differences in epidydimal (caput, corpus, and cauda) and ejaculated brown bear spermatozoa. A post-mortem epididymal sperm sample was obtained from an adult brown bear after accidental death. The epididymides were excised, washed, and dissected into the three major segments; caput, corpus and cauda. Then multiple incisions were made in the tissue to allow migration of spermatozoa into the surrounding medium. Semen was collected by electroejaculation from five adult brown bears living in a semi-free ranging environment in the Cabarceno Park (Cantabria, Spain). Anesthesia was induced using tiletamine + zolazepan (Zoletil 100®; Virbac, Carras, France; 7 mg/kg), and ketamine (Imalgene 1000®; Rhone Merieux, Lyon, France; 2 mg/kg). The electroejaculation unit (PT Electronics®; Boring, Oregon) was connected to a 3-lateral electrode transrectal probe (26 mm in diameter, 320 mm in length). Ejaculation occurred at 6–10 V/250–300 mA. For head morphometry assessment, sperm samples were fixed in glutaraldehyde and slides were smeared and air-dried for 2 h. The samples were then stained with Diff-Quik® staining (37°C; 10 min in the red component and 15 min in the blue component). The area, perimeter, length and width, and ellipticity (length/width) of heads were measured from at least 100 spermatozoa/slide. As shown in Table 1, values obtained for each measure were similar in both epididymal and ejaculated spermatozoa. These results provide normal morphometry values for brown bear spermatozoa, a potentially useful characteristic for predicting fertility. Table 1. Head morphometry for epididymis and ejaculated bear sperm (mean ± SD) This work was supported in part by CANTUR S.A. and CICYT (CGL 2004–0278/BOS).
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Steffen, Martina L., e C. R. Harington. "Giant short-faced bear (Arctodus simus) from late Wisconsinan deposits at Cowichan Head, Vancouver Island, British Columbia". Canadian Journal of Earth Sciences 47, n.º 8 (agosto de 2010): 1029–36. http://dx.doi.org/10.1139/e10-018.
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A giant short-faced bear ( Arctodus simus ) ulna fragment was found at the base of exposed Quaternary sediments at Cowichan Head, southern Vancouver Island, British Columbia. In this paper, the ulna fragment and its geological context are described and a reasonable taphonomic trajectory is presented. The radiocarbon age of 22 750 ± 140 BP on the bone indicates that these bears were on Vancouver Island during the late Wisconsinan. A likely source for the Cowichan Head A. simus was from the mainland to the southeast.
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Ruparelia, Jigish, Rajnish Patidar, Jaskaran Singh Gosal, Mayank Garg, Suryanarayanan Bhaskar e Deepak Kumar Jha. "An Aberrant Line on CT Head: The Mendosal Suture". Journal of Neurosciences in Rural Practice 11, n.º 03 (16 de junho de 2020): 502–3. http://dx.doi.org/10.1055/s-0040-1713304.
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AbstractA knowledge of variant anatomy is important in clinical practice. The skull bones have several normal anatomical variations, especially in the occipital bone. Accessory sutures have been described in newborns and young children.In this study, we discussed radiological findings of an accessory occipital suture in a 14-year-old child who had presented with mastoiditis and brain abscess. We further describe this “mendosal suture,” and its pathophysiology and clinical implications. It is important to bear this entity in mind to avoid misdiagnosing this as a fracture. The use of CT scans and 3D CT using volume rendering technique (VRT) helps in detection and correct diagnosis.
Teses / dissertações sobre o assunto "Bear with colander on head"
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Akraboff, Nicolina Alden. "Design of transmission mechanisms for the head of the 'Huggable' robotic teddy bear". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43012.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.Includes bibliographical references.
The head of the Huggable teddy bear, a robotic companion for use in hospitals, schools, and other locations, must contain three degrees of freedom. It must contain transmissions allowing it to nod up and down, tilt side to side, and move its eyebrows and ears to convey emotions. In addition to the desired movement, care must be taken to integrate the transmissions such that they do not interfere with each others movement. The transmissions themselves must be silent and back drivable in order to appear more lifelike The resulting design allows for all of the desired degrees of freedom and was designed with silence and back drivability in mind. The transmissions are formed together into one mechanical head mechanism to which all other components in the head, such as speakers and controllers, can be attached. The design is currently being built and tested.
by Nicolina Alden Akraboff.
S.B.
Livros sobre o assunto "Bear with colander on head"
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Corbett, W. J. The bear who stood on his head. London: Methuen Children's, 1988.
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Stoddard, Tom. Turnaround: The untold story of Bear Bryant's first year as head coach at Alabama. Montgomery: Black Belt Press, 1996.
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Arnold, J. Douglas, e Zach Meston. Awesome Super Nintendo Secrets 4. Lahaina, HI: Sandwich Islands Publishing, 1995.
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Tchaikovsky, Adrian. Bear Head. Head of Zeus, 2021.
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Tchaikovsky, Adrian. Bear Head. Head of Zeus, 2021.
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Tchaikovsky, Adrian. Bear Head. Head of Zeus, 2021.
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Fry, Stephen. Rescuing the Spectacled Bear Head. Penguin Random House, 2002.
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Burton, Brian J. A Bear with a Sore Head. Hanbury Plays, 1989.
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Rawlins, John. Roast Beef Bear & Mr. Cracker Head. Cochingyan-Rawlins, Sylvia, 2022.
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Rawlins, John. Roast Beef Bear & Mr. Cracker Head. Cochingyan-Rawlins, Sylvia, 2022.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Bear with colander on head"
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Ferrari, Marco, Nausica Montalto e Piero Nicolai. "Novel Approaches in Surgical Management: How to Assess Surgical Margins". In Critical Issues in Head and Neck Oncology, 95–110. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63234-2_7.
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AbstractThe concept of surgical margins was born a long time ago but still lacks a univocal and sound understanding. The current biological rationale behind the recommendations on margins management relies on two pillars: (1) the observation that groups of cancer cells can leave the macroscopic tumor and disseminate throughout adjacent tissues with different degrees of aggressiveness; (2) the belief that removal of all (or most of) cancer cells can cure the patient. However, this background is undermined by some pieces of evidence. For instance, it has been proven that tissues surrounding cancer often bear precancerous traits, which means that cutting through non-cancerous tissues does not equate to cut through healthy tissues. The head and neck exquisitely poses a number of challenges in the achievement of negative margins, with special reference to anatomical complexity, high density in relevant structures, and unique histological heterogeneity of cancers. Currently, intraoperative margins evaluation relies on surgeons’ sight, palpation, ability to map tumor extension on imaging, and knowledge of anatomy, with some optical imaging technologies aiding the delineation of the mucosal margins of excision. Frozen sections are currently used to intraoperatively evaluate margins, yet with debate on whether and how this practice should be performed. Future perspectives on improvement of margins control are threefold: research is oriented towards refinements of understanding of cancers local progression, implementation of technologies to intraoperatively render tumor extension, and employment of optical imaging modalities capable of detecting foci of residual tumor in the surgical bed.
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Waselkov, Gregory A., e J. Lynn Funkhouser. "Bear-Human Relationships in Native Eastern North America". In Bears, 271–310. University Press of Florida, 2020. http://dx.doi.org/10.5744/florida/9781683401384.003.0013.
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This volume’s case studies recognize the black bear (Ursus americanus) to be among the most socially consequent of species in Native Eastern North America, despite meager remains at many archaeological sites. Indeed, that sparseness offers valuable evidence for the social roles long played by bears. Ethnohistorical sources suggest bear population densities in some habitats were greater than seen today in Eastern North America. Most archaeological assemblages of bear skeletal remains have skull parts and foot bones but lack most other postcranial elements, often reflecting ritual off-site discard of post-cranial remains and feasting on head and feet. Differences in quantities of bear remains, their relative proportions to other mammals, and differing representations of various parts of the bear skeleton are sensitive indicators of a society’s relationship with black bears. We apply precepts of the new animism, or the ontological turn, to animate the zooarchaeology of bears in Eastern North America.
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Gaskell, Elizabeth. "Chapter XXVII". In Ruth. Oxford University Press, 2011. http://dx.doi.org/10.1093/owc/9780199581955.003.0031.
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As Ruth went along the accustomed streets, every sight and every sound seemed to bear a new meaning, and each and all to have some reference to her boy’s disgrace. She held her head down, and scudded along dizzy with fear, lest some word...
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Rosenblum, Joshua. "“The Bear, the Tiger, the Hamster and the Mole”". In Closer than Ever, 159–68. Oxford University Press, 2024. http://dx.doi.org/10.1093/oso/9780197758236.003.0019.
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Abstract This chapter features a close analysis of “The Bear, the Tiger, the Hamster and the Mole,” a quintessential Maltby/Shire number, plus an interview with the writers about the song. It was written for but cut from the musical Baby, then resurrected for the revue Closer Than Ever. Sung by an animal scientist with a frustrating love life, this number explores in highly enjoyable detail the enduring conflict between the head and the heart that numerous Maltby/Shire protagonists grapple with. Maltby discusses the challenge involved in building a comic number so that each punchline tops the previous one. He also notes that as a lyric gets closer to a specific truth, available vocabulary expands, and potential new rhymes reveal themselves.
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Satapathy, Suchismita. "An Integrated Approach for Selection and Design of Sustainable Farmers' Protective-Hat in India". In Advances in Environmental Engineering and Green Technologies, 142–72. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-9975-7.ch008.
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Normally, the farmers in India are required to work in adverse climatic conditions while performing their agricultural activities. Though a number of preventive measures are available for the protection of farmers, the nominal and small scale farmers are still unable to bear these expenses. Therefore, an attempt was made in this study to the select the most appropriate material using Fuzzy-TOPSIS method to carry out the design of the head-cap for farmers in terms of parameters like stiffness, cost, durability, and availability in India. Further, for a sustainable design of these head-cap, the genetic algorithm (GA) as well as Sun Flower Optimization (SFO) method were use to obtain the best fitness values based on the anthropometric dimensions of farmers' head.
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Adger, David. "Functional Categories 1—TP". In Core Syntax, 155–203. Oxford University PressOxford, 2003. http://dx.doi.org/10.1093/oso/9780199243709.003.0005.
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Abstract One of our initial primary aims was to characterize the notion of sentence in I-language terms. We are now in a position to do this: we know that sentences consist of constituents, which may be embedded within each other, and which bear 0-relations, selectional relations, and modification relations to each other; we know that these constituents are characterized by features that are projected from the lexical items which head them, and we have developed in some detail a view of the particular elements that go into making up 𝓋P.
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Ghisotti, Gianni Deho` Daniela. "The Satellite Phage P4". In The Bacteriophages, 391–408. Oxford University PressNew York, NY, 2005. http://dx.doi.org/10.1093/oso/9780195168778.003.0026.
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Abstract In the early 1960s Erich Six isolated a temperate bacteriophage, P4, that formed plaques only on Escherichia coli strains lysogenic for P2 or a P2-related phage (90, 91). Before long, it was established that P4 depended on the P2 helper phage for all morphopoietic and lysis ‘‘late’’ functions, and that the head and tail proteins of P4 virions were encoded by P2 (51, 92). Interestingly, the smaller P4 genome, encapsidated into a smaller head (figure 26-1), did not bear any substantial similarity to P2 DNA and was independent of the helper for DNA replication and host lysogenization (68, 91, 92). The functional and structural unrelatedness of the two replicons clearly indicated that P4 was not a defective P2 but an independent entity and the prototype of ‘‘satellite viruses,’’ genetic elements that exploit unrelated viruses for viral propagation.
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Deho, Gianni, e Daniela Ghisotti. "The Satellite Phage P4". In The Bacteriophages, 391–408. Oxford University PressNew York, NY, 2005. http://dx.doi.org/10.1093/oso/9780195148503.003.0026.
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Abstract P4, the Satellite Phage, the PlasmidIn the early 1960s Erich Six isolated a temperate bacteriophage, P4, that formed plaques only on Escherichia coli strains lysogenic for P2 or a P2-related phage (90, 91). Before long, it was established that P4 depended on the P2 helper phage for all morphopoietic and lysis ‘‘late’’ functions, and that the head and tail proteins of P4 virions were encoded by P2 (51, 92). Interestingly, the smaller P4 genome, encapsidated into a smaller head (figure 26-1), did not bear any substantial similarity to P2 DNA and was independent of the helper for DNA replication and host lysogenization (68, 91, 92). The functional and structural unrelatedness of the two replicons clearly indicated that P4 was not a defective P2 but an independent entity and the prototype of ‘‘satellite viruses,’’ genetic elements that exploit unrelated viruses for viral propagation.
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Goldfinger, Eliot. "Four-Legged Animals Skeleton & Superficial Muscles (Side View)". In Animal Anatomy for Artists. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780195142143.003.0012.
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Domestic cat characteristics: Rounded skull, short snout. Long whiskers. Large canines, small incisors. Cheek teeth with sharp edges for shearing. Large temporalis and masseter muscles of skull. Eyes shifted slightly forward for binocular vision. Large eyes in domestic cats. Constricted pupil in domestic cats is vertical; round in large cats. Top edge of scapula usually higher than tips of thoracic vertebrae. Small rib cage. Five digits on front limb (thumb reduced); four digits on hind limb—may have very reduced first metatarsal or reduced first digit with claw (dewclaw). Walks on toes. Sharp, curved, retractile claws (which keeps them sharp—they don’t walk on them). Forearm rotates (pronates/supinates). Hairy tail. Very flexible body. Spine (back) straight or arched. Can walk in crouched position, as when stalking prey. Bear characteristics: Large, powerful body; powerful limbs appear relatively short. Rear feet wide. Walks on sole and heel of rear foot and usually on digits of front foot. Five digits per limb with long, curved, nonretractile claws. Front claws longer than rear claws. Large head, small eyes. Small, round, erect, furry ears. Large canines; flat, grinding molars. Short tail. Arched back, high shoulder. Grizzly has most prominent shoulder hump and dished, slightly concave face (in profile). Can have very thick layer of fur. Grizzly and brown bear belong to the same species, but differ in geographical range and size. The giant panda is now considered to be a member of the bear family, not the raccoon family.
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Cornell, Saul. "Introduction". In A Well-Regulated Militia, 1–8. Oxford University PressNew York, NY, 2008. http://dx.doi.org/10.1093/oso/9780195341034.003.0001.
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Abstract Whipping the crowd into a frenzy at the National Rifle Association annual convention, Charlton Heston, the group’s charismatic president, raised an antique rifle above his head and challenged gun control proponents to pry his weapon from his “cold, dead hands.” This defiant gesture, repeated on numerous occasions by the chisel-jawed actor known for his portrayals of key figures in history, has become a powerful symbol in America’s bitter debate over the right to bear arms. To dramatize his rebellious stance, Heston did not wave a modern assault rifle, but a Revolutionary-era rifle, an iconic symbol that adorns progun Web sites, tee shirts, and bumper stickers.
Trabalhos de conferências sobre o assunto "Bear with colander on head"
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Pi, Yue, e Ting Hou. "Resistance and Thermal Stress Analysis of Mini-Flow Pipeline of Residual Heat Removal System in Pressurized Water Reactor". In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-64401.
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Abstract During the start-up and shutdown of Pressurized Water Reactor (PWR), the residual heat removal system is responsible for taking the decay heat out of the reactor core. The heat-up of the residual heat removal system before it is connected to the primary circuit is of great significance for the integrity and reliability of the residual heat removal system and the primary circuit. The mini-flow pipeline in the residual heat removal system is the main component of the system heat-up. Due to its small diameter and fast flow speed, the mini-flow pipeline bear all the pressure head loss under heat-up conditions. In this paper, ANSYS-FLUENT is used to model the mini-flow pipeline, and the resistance characteristics of the pipeline under heat-up condition are analyzed with the change of the flow rate. The results show that FLUENT can accurately predict the pressure drop of the mini-flow pipeline. The results provides the basis for the future optimization. Also, ANSYS is used to analyze the hot and cold fluid mixing between the mini-flow pipeline and the main pipeline and the thermal stress generated. The analysis shows that the stress zones, mainly concentrated in the tee pipe and its upstream, are obvious at the beginning of heat-up and negligible at the end.
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Zhu, Jianwei, Shiyi Bao, Yuebing Li e Zengliang Gao. "Creep Analysis of Hemisphere Shell Structure Under High Temperature Gradient". In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-29078.
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The In-Vessel Retention (IVR) of molten core debris has been part of the severe accident management strategy for advanced pressurized water reactor (PWR) plant. Generally, the pressure is supposed to successfully be released, and the externally cooled lower head wall mainly experiences the temperature difference which may be more than 1000°C. However, the Fukushima accident shows that a certain pressure (up to 8.0MPa) still exists inside the reactor pressure vessel (RPV). Therefore, in order to make the IVR succeed, it is necessary to investigate the structural integrity of the RPV under the combined internal pressure and the thermal load on the lower head. Therefore, it is supposed that the lower head of RPV is a Hemisphere Shell Structure (HSS) with 2150mm external radius and 25mm wall thickness. Similarly, the outer wall temperature is supposed to be 127°C, the wall temperature difference 1200°C, and the material properties (i.e., thermal conductivity, specific heat capacity, yield strength, and so on) are dependent on the temperature. In this paper, the main subjects discussed are as below. First, the heat transfer analysis is carried out to obtain the temperature distribution of the HSS wall. Due to the high temperature gradient, there may present different failure modes along the HSS wall thickness, i.e., plastic failure and creep failure. Then, the stress and strain distributions along the wall thickness are analyzed by ANSYS finite element method where the Norton-Bailey type creep law is adopted. The result shows that the stress in the lower temperature part (LTP) whose temperature is lower than 405°C is lower than the yield stress of the material with the corresponding temperature. That is to say, the LTP still can bear a certain internal pressure. At last, to consider the combined impact of internal pressure and temperature difference on the HSS, the finite element analysis is carried out by adopting the isochronous stress-strain curves of the Chinese RPV material. The relationship between the stress in the LTP at 100 hours and the internal pressure is discussed, and the limit internal pressure is determined. It is concluded that HSS still can maintain its integrity under IVR, even if there exists a certain internal pressure.
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Han, Jialin, Sota Kanno, Akito Mochizuki, Daisuke Kitazawa, Teruo Maeda e Hiroshi Itakura. "Study on Attitude Control of a Cabin-Suspended Catamaran by Using a Double-Loop Control System". In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95827.
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Abstract A series of cabin-suspended ships, named Wave Harmonizer, has been developed since 2008. The model ship consists of cabin part, hull part and conjunction part which is mounted in-between the cabin and the hull. The possibility and feasibility of introducing suspensions into small vessels are investigated. Effectiveness evaluations are made in two aspects: motion reduction of the cabin and wave energy harvesting through the oscillating cabin. According to the research results obtained in 2015 and 2016, it was found that the deck of the cabin may bear obvious inclination while weights were loading or unloading from it. Moreover, in relative long waves, the effectiveness of the motion reduction of the skyhook controller was insufficient. To solve those problems, an attitude control strategy is proposed. It is adopted as an outer-loop of the existing controller. Inclination sensors are employed to collect the rotational angle of the cabin in terms of pitch and roll. After finishing the design and construction of the double-loop control system, open loop tests are carried out in dry and wet conditions. The chain mechanism of the ship is investigated. Then a bench test is operated to validate the control concept and performance of the double-loop control system. Finally, tank tests are implemented to examine the inclination reduction of the cabin at regular head waves. In this paper, the development of the double-loop control system is described, experimental results are demonstrated with respect to the heave and pitch motion reduction of the cabin at the condition of with/without the outer control loop. It shows that the inclination reduction at the loading/unloading condition and the walking-on-deck condition are significant. However, in waves the effectiveness is not clearly verified. It suggests that the influence of the apparent gravity on the inclination measurement in waves should be investigated and solutions to accurately detect the inclination of the cabin should be sought.
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Alfaro, Jose´ A., A. Lecuona, J. Roa e E. Ferru´s. "Integrated Pressurized Gasification of Biomass for Small Gas Turbines". In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90125.
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Nowadays small and micro gas turbines are increasingly used for on-site cogeneration. Although this means a dramatic increase in energy efficiency, liquid or gaseous fossil fuels are used. At the same time, there is interest in using solid biomass for electricity production in a distributed generation scheme. Unfortunately, conventional gas turbines can not burn solid biomass. This paper presents a thermodynamic simulation of a pressurized gasification system integrated into a gas turbine Brayton cycle, in order to study the feasibility of using biomass. The critical process of burning the resulting low-calorific-value gas is experimentally scrutinized for feasibility using a LOWNOX-LPP combustor and a synthetic gas. The results are promising. The thermochemical processing of biomass gasification using air produces a fuel barely suitable for gas turbines. Biomass gasification using air with no cooling provides outlet temperatures in the range from 700 K to 900 K and heat values of around 6 MJ/kg, being the tar content low and in a gaseous state, especially with down-draft moving bed gasifiers. Fuel gas cleaning is possible in a cyclone particle separator without previous cooling. This system requires a special design to bear the high temperature and to separate the ash particles down to turbine tolerance, without causing too much pressure loss and clogging. Additional hot filtering using porous media is also feasible. Two benefits arise due to high temperature cleaning. Firstly, tars do not condense but burn in the combustor increasing the biogas calorific value. Secondly, the thermal enthalpy from gasification is recovered. Therefore, the whole biomass primary energy is injected in the working gases, except heat losses. On the other hand, the gasification reactor needs to work pressurized (at a slightly higher pressure than the combustor pressure) thus requiring an additional power to overcome the head loss caused by the biomass bed and the cyclone particle separator. Thermodynamic analysis shows that under favourable conditions, a fall of around 1% of the overall efficiency appears. The heat value of gas and fuel-to-air ratio of the mixture affect flame stability inside the combustor. Nevertheless, with a swirl stabilized flame it has been demonstrated that it is possible to obtain stable flames down to 6 MJ/kg heating value with low CO and NOx emissions. For these preliminary experiments synthetic gases representing gasifiers output have been used. Using the integrated scheme here studied for feasibility, off-the-shelf gas turbines could be transformed into biomass burning micro-cogenerators, thus contributing to greenhouse gases emission reduction.
Relatórios de organizações sobre o assunto "Bear with colander on head"
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Thomas, M. D. Magnetic and gravity characteristics of the Thelon and Taltson orogens, northern Canada: tectonic implications. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329250.
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Differences of opinion concerning the relationship between the Thelon tectonic zone and the Taltson magmatic zone, as to whether they are individual tectonic elements or two independent elements, have generated various plate tectonic models explaining their creation. Magnetic and gravity signatures indicate that they are separate entities and that the Thelon tectonic zone and the Great Slave Lake shear zone form a single element. Adopting the single-element concept and available age dates, a temporally evolving plate tectonic model of Slave-Rae interaction is presented. At 2350 Ma, an Archean supercontinent rifted along the eastern and southern margins of the Slave Craton. Subsequent ocean closure, apparently diachronous, began with subduction at 2070 Ma in the northern Thelon tectonic zone, followed by subduction under the Great Slave Lake shear zone at 2051 Ma. Subduction related to closure of an ocean between the Buffalo Head terrane and the Rae Craton initiated under the Taltson magmatic zone at 1986 Ma, at which time subduction continued along the Thelon tectonic zone. At 1970 Ma, collision in the northern Thelon tectonic zone is evidenced in the Kilohigok Basin. From 1957 to 1920 Ma, plutonism was active in the Taltson magmatic zone, Great Slave Lake shear zone, and southern Thelon tectonic zone. The plutonism terminated in the northern Thelon tectonic zone at 1950 Ma, but it resumed at 1910 Ma and continued until 1880 Ma. The East Arm Basin witnessed igneous activity as early as 2046 Ma, though this took place more continuously from 1928 to 1861 Ma; some igneous rocks bear subduction-related trace element signatures. These signatures, and the presence of northwest-verging nappes, may signify collision with the Great Slave Lake shear zone as a result of southeastward subduction, completing closure between the Slave and Rae cratons.