Relevant bibliographies by topics / Twin species

Academic literature on the topic 'Twin species'

Author: Grafiati
Published: 14 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Twin species.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Twin species"

1

Bazalová, Denisa, Katarína Botková, Katarína Hegedüšová, Jana Májeková, Jana Medvecká, Mária Šibíková, Iveta Škodová, Mária Zaliberová, and Ivan Jarolímek. "Twin plots – appropriate method to assess the impact of alien tree on understory?" Hacquetia 17, no. 2 (December 1, 2018): 163–69. http://dx.doi.org/10.1515/hacq-2017-0012.

Full text
Abstract:
Abstract Replacing native forests by alien tree plantations can lead to changes in the species composition of the understory. However, differences in the understory species spectrum can also be a part of the natural variability of forest stands. We have tested the suitability of the twin plots method for an evaluation of the impact of alien trees on the species composition of the understory. This research was conducted on an alluvial plain (SW Slovakia) that was originally covered by a hardwood floodplain forest. The study was based on 7 twin plots of black locust (Robinia pseudoacacia) and native forest plots, with a maximum distance of 100 meters between the members of the twins. The dissimilarity of the plots within the black locust forest was significantly lower than the dissimilarity between the twin plots. In addition, the dissimilarity of the plots within the hardwood floodplain forest was also significantly lower than the dissimilarity between the twin plots. Under the same environmental conditions, the higher dissimilarity of the twin plots was caused by major edificators and their impact on the understory vegetation. The twin plots method proved to be a suitable tool for analyses of the impact of alien trees on understory vegetation.
APA, Harvard, Vancouver, ISO, and other styles
2

St Clair, John, Roisin Campbell-Palmer, and Richard Lathe. "Sex Ratios Provide Evidence for Monozygotic Twinning in the Ring-Tailed Lemur,Lemur catta." Twin Research and Human Genetics 17, no. 1 (January 2, 2014): 51–55. http://dx.doi.org/10.1017/thg.2013.84.

Full text
Abstract:
Monozygotic (MZ) twinning is generally considered to be rare in species other than human. We inspected sex ratios in European zoo-bred ring-tailed lemurs (Lemur catta), revealing a significant excess of same-sex twins. Of 94 pairs, 60 (64%) were either both males or both females (p= .004). Application of the Weinberg differential rule argues that 27% of all twins in this species are MZ pairs. In this protected species, where twinning is commonplace (~50% of newborns are twins), the probable existence of frequent MZ twinning has ramifications for breeding programs aimed to maximize genetic diversity, and suggests that twin studies in a species other than human could have potential as a medical research tool.
APA, Harvard, Vancouver, ISO, and other styles
3

Pavan, L., B. Gasser, V. J. C. Santos, M. C. Maronezi, P. Silva, A. R. Assis, P. H. S. Garcia, R. Martins Junior, R. A. R. Uscategui, and M. A. R. Feliciano. "Ultrasonographic diagnosis of twins in two pregnant bitches: case report." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 72, no. 1 (January 2020): 102–6. http://dx.doi.org/10.1590/1678-4162-11331.

Full text
Abstract:
ABSTRACT Multiple pregnancies in humans account for only 3% of pregnancies, 97-98% of which are twin pregnancies and the morbimortality is higher in the monochorionic twins when compared to dichorionic ones. The canine species is naturally multiparous, but the diagnosis of monochorionic twin pregnancy is not common. The objective of this report was to describe the ultrasonographic diagnosis of monochorionic twin pregnancies in two bitches [Pug (case 1) and Shih tzu (case 2)]. It was possible to verify the presence of one gestational vesicle containing two fetuses in each female by observing two heads or two bodies within the same placental site. These fetuses presented adequate viability and normal organogenesis. Their development was similar to the other fetuses. In case 1 they were stillborn and smaller than the other five live-born fetuses. The twins in case 2 were born alive, but they also appeared smaller when compared to the littermates. The gestational risks associated with this condition in pregnant bitches are still unknown, however, there are reports of fetal death in monochorionic pregnancies in this species. Therefore, ultrasonographic exam during pregnancy allows an early monochorionic diagnosis and monitoring the fetal viability could bring health benefits to both the female and the littermates.
APA, Harvard, Vancouver, ISO, and other styles
4

Shaughnessy, P., and E. Erb. "Apparent twin pups of the Weddell seal Leptonychotes weddellii (Carnivora: Phocidae) near Mawson, Antarctica." Australian Mammalogy 25, no. 2 (2003): 197. http://dx.doi.org/10.1071/am03197.

Full text
Abstract:
PHOCID seals give birth annually, generally to a single pup. Twins have been reported occasionally, either from observations made in utero or from observations of live pups in the field. Examples of the former are reports of two embryos in a Weddell seal, Leptonychotes weddellii (Bertram 1940) and of twin foetuses of a southern elephant seal, Mirounga leonina (Bryden 1966). Observations of two pups suckling one adult female have been reported for L. weddellii (e.g., Gelatt et al. 2001). For M. leonina, Carrick et al. (1962) reported an adult female that expelled two placentae and gave birth to a pup while another newborn pup was nuzzling the female. The occurrence of twin pups in several pinniped species is reviewed by Spotte (1982). Here we use the expression 'apparent twins' to refer to reports of twin L. weddellii pups that are based solely on field observations of two pups with the same adult female on several occasions.
APA, Harvard, Vancouver, ISO, and other styles
5

Watkins, D. I., Z. W. Chen, A. L. Hughes, F. S. Hodi, and N. L. Letvin. "Genetically distinct cell populations in naturally occurring bone marrow-chimeric primates express similar MHC class I gene products." Journal of Immunology 144, no. 10 (May 15, 1990): 3726–35. http://dx.doi.org/10.4049/jimmunol.144.10.3726.

Full text
Abstract:
Abstract The cotton-top tamarin (Saguinus oedipus) is a naturally occurring "A" + "B"----"A" bone marrow-chimeric species. These primates usually are born as dizygotic twins and, due to placental vascular anastomoses, develop sharing each others' bone marrow elements. Strikingly, almost 50% of the PBL of a member of a twin pair are derived from the hematopoietic stem cells of its cotwin. To clarify the mechanisms underlying the maintenance of tolerance in these stable chimeras, MHC gene products have been biochemically characterized in cloned, genetically distinct, male and female lymphocytes from two male/female cotton-top tamarin twin pairs. Extensive MHC class II sharing between the genetically distinct cell populations was not seen in the two twin pairs. This was consistent with the MHC class II polymorphism seen in the species. However, the MHC class I gene products expressed by one member of a twin pair were almost identical to those expressed by its cotwin. A human minisatellite probe demonstrated restriction fragment length polymorphism in DNA from these animals, indicating extensive polymorphism. Thus, MHC class I sharing did not occur due to inbreeding in these animals. Additionally, another bone marrow-chimeric primate species, the common marmoset (Callithrix jacchus), expresses MHC class I molecules with low levels of variation. These studies suggest that the stable chimerism of bone marrow-chimeric primates may be facilitated by MHC class I similarity between the genetically distinct bone marrow derived-cell populations in their circulation.
APA, Harvard, Vancouver, ISO, and other styles
6

Britt, Lyle L., Ellis R. Loew, and William N. McFarland. "Visual pigments in the early life stages of Pacific northwest marine fishes." Journal of Experimental Biology 204, no. 14 (July 15, 2001): 2581–87. http://dx.doi.org/10.1242/jeb.204.14.2581.

Full text
Abstract:
SUMMARY Microspectrophotometry was used to measure the visual pigments in the rods and cones of 22 species of marine fish larvae netted from the surface waters off Friday Harbor Laboratories, Washington, USA. 13 species had rods, 12 of which contained visual pigments with a wavelength of maximum absorbance near 500nm, while one, the sand lance (Ammodytes hexapterus), had its absorbance maximum at 482nm. The 22 species of fish larvae possessed varied combinations of single, double and twin cones, ranging in peak absorbance from 353nm to 584nm. Of these, green-sensitive single cones were present in 20 of the 22 species, and were the dominant cone type. Double and twin cones were present in 13 of the species. Most common were identical green-sensitive (twin) cones (in 11 species). Green/yellow-sensitive double cones occurred in four species. In a single instance (Hemilepidotus hemilepidotus) twin blue-sensitive, twin green-sensitive and double blue/yellow-sensitive cones were recorded. Of particular interest was the finding that 18 of the species had ultraviolet- and/or violet-absorbing single cones. It has been suggested that short-wavelength photosensitivity may be beneficial for planktivory by extending the spectral range over which vision can occur. The high percentage (82%) of ultraviolet and violet visual pigments in Pacific northwest fish larvae supports the prediction that short-wavelength sensitivity may be common in marine fish larvae.
APA, Harvard, Vancouver, ISO, and other styles
7

Corby, Patricia M., Walter A. Bretz, Thomas C. Hart, Nicholas J. Schork, J. Wessel, James Lyons-Weiler, and Bruce J. Paster. "Heritability of Oral Microbial Species in Caries-Active and Caries-Free Twins." Twin Research and Human Genetics 10, no. 6 (December 1, 2007): 821–28. http://dx.doi.org/10.1375/twin.10.6.821.

Full text
Abstract:
AbstractOral microbes that colonize in the mouths of humans contribute to disease susceptibility, but it is unclear if host genetic factors mediate colonization. We therefore tested the hypothesis that the levels at which oral microbes colonize in the mouth are heritable. Dental plaque biofilms were sampled from intact tooth surfaces of 118 caries-free twins. An additional 86 caries-active twins were sampled for plaque from carious lesions and intact tooth surfaces. Using a reverse capture checkerboard assay the relative abundance of 82 bacterial species was determined. An integrative computational predictive model determined microbial abundance patterns of microbial species in caries-free twins as compared to caries-active twins. Heritability estimates were calculated for the relative microbial abundance levels of the microbial species in both groups. The levels of 10 species were significantly different in healthy individuals than in caries-active individuals, including,A. defectiva, S. parasanguinis, S. mitis/oralis, S. sanguinis, S. cristatus, S. salivarius, Streptococcussp. clone CH016,G. morbillorumandG. haemolysans.Moderate to high heritability estimates were found for these species (h2= 56%–80%,p< .0001). Similarity of the overall oral microbial flora was also evident in caries-free twins from multivariate distance matrix regression analysis. It appears that genetic and/or familial factors significantly contribute to the colonization of oral beneficial species in twins.
APA, Harvard, Vancouver, ISO, and other styles
8

Mette, Tobias, Susanne Brandl, and Christian Kölling. "Climate Analogues for Temperate European Forests to Raise Silvicultural Evidence Using Twin Regions." Sustainability 13, no. 12 (June 8, 2021): 6522. http://dx.doi.org/10.3390/su13126522.

Full text
Abstract:
Climate analogues provide forestry practice with empirical evidence of how forests are managed in “twin” regions, i.e., regions where the current climate is comparable to the expected future climate at a site of interest. As the twin regions and their silvicultural evidence change with each climate scenario and model, we focus our investigation on how the uncertainty in future climate affects tree species prevalence. We calculate the future climate from 2000 to 2100 for three ensemble variants of the mild (representative concentration pathway (RCP) 4.5) and hard (RCP 8.5) climate scenarios. We determine climatic distances between the future climate of our site of interest ‘Roth’ and the current climate in Europe, generating maps with twin regions from 2000 to 2100. From forest inventories in these twin regions we trace how the prevalence of 23 major tree species changes. We realize that it is not the ‘how’ but the ‘how fast’ species’ prevalence changes that differs between the scenario variants. We use this finding to develop a categorization of species groups that integrates the uncertainty in future climate. Twin regions provide further information on silvicultural practices, pest management, product chains etc.
APA, Harvard, Vancouver, ISO, and other styles
9

Negi, Pitambar. "Occurrence of Polyembryony in Juniperus Polycarpos C. Koch." Indian Journal of Forestry 37, no. 2 (June 1, 2014): 161–64. http://dx.doi.org/10.54207/bsmps1000-2014-gsvahs.

Full text
Abstract:
The natural regeneration in Juniperus polycarpos is quite low due to seed dormancy. While studying the seed germination behaviour of Juniperus polycarpos, a twin seedling was found germinated from a single seed which has been reported. This is the first instance of occurrence of polyembryonic seedlings in Juniperus polycarpos which have been reported in this paper. The twin seedlings have been resulted due to the phenomenon of polyembryony which is of rare occurrence in this species, however, the production of twin seedlings has been reported earlier also in other forest tree species. The twin seedlings were found to be independent having separate taproots and cotyledons. The seedlings were later transplanted in a polybags filled with Soil: Sand: FYM (2:1:1 :) to observe the further growth of twin seedlings. After three months, it was noticed that both the twin seedlings shriveled and died where as normal seedlings continued to grow normally and produced all the essential features of a plant.
APA, Harvard, Vancouver, ISO, and other styles
10

Gunaga, Rajesh, and R. Vasudeva. "A New report on twin seedlings in Semecarpus Kathalekanensis, a critically endangered tree species of the Myrisitca swamps of Western Ghats." Journal of Non-Timber Forest Products 18, no. 4 (December 1, 2011): 331–32. http://dx.doi.org/10.54207/bsmps2000-2011-6yu7cz.

Full text
Abstract:
In this paper, observation on twin seedlings in Semecarpus kathalekanensis is reported. Out of 850 seeds germinated (from seven individuals), two seeds gave out twin seedlings. Further, the growth of twin seedlings with normal seedlings have been recorded and discussed here.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Twin species"

1

Sun, Shang [Verfasser]. "Development of a twin-cuvette measurement system for trace gas flux measurements and its application to various gas species under laboratory conditions / Shang Sun." Mainz : Universitätsbibliothek Mainz, 2016. http://d-nb.info/1120529883/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Latham, Rachel M. "Mothers' and fathers' perceptions of the family context and children's adjustment : coparenting young twins." Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/68391/.

Full text
Abstract:
Mothers' and fathers' perceptions of the quality of coparenting – the way in which they work together in their role as parents – forms the focus of three papers that comprise this thesis. Using a novel sample of ‘intact' families with young twins, this research extends the existing coparenting literature beyond its typical focus on first-born children, to include more complex families. Participants were families who were part of the Twins, Family and Behaviour (TFaB) Study, a longitudinal, multimethod study of UK families with twins born in 2009/10 conducted by myself and my colleague over a two-year period. Paper 1 examines bidirectional associations between coparenting and the marital relationship during the transition-to-school period. Controlling for cross-sectional associations and temporal stability, parents' perceptions of higher quality coparenting were associated with their subsequent report of a higher quality marital relationship. Reciprocal associations between the marital relationship and subsequent coparenting, however, were not evidenced. These findings highlight the salience of coparenting for the marital relationship, and suggest that interventions seeking to improve the couples' marital relationship should pay close attention to their coparenting. Paper 2 focuses on parenting sense of competence (PSOC), examining the role of children's disruptive behaviour, coparenting, and their interaction. For both mothers and fathers there was a significant interaction between their perceptions of coparenting and children's disruptive behaviour such that high quality coparenting may protect the PSOC of parents dealing with high levels of children's disruptive behaviour. These findings imply that practitioners and interventions concerned with promoting PSOC should pay due attention to the quality of coparenting as an important family context. Paper 3 examines family-wide and child-specific effects of coparenting and coercive parenting on the development of children's disruptive behaviour. Mothers' perceptions of coparenting interacted with maternal overall coercive parenting such that high quality coparenting intensified the toxicity of maternal coercive parenting for children's disruptive behaviour. This novel – and unexpected – finding indicates that the influence of high quality coparenting is not necessarily always positive. Coparenting interventions aiming to improve child outcomes would therefore be well-advised to also consider parenting strategies. Further research is encouraged to explore these research questions within samples of socioeconomic diversity and across family types, as well as studies designed to examine twin and non-twin family differences.
APA, Harvard, Vancouver, ISO, and other styles
3

Mark, Katharine Mary. "Sibling relationship quality : a longitudinal study of twins and their families." Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/66935/.

Full text
Abstract:
The overarching goal of this thesis was to examine sibling relationship quality in young twin children, as well as the ways in which this key bond is associated with other familial relationships within the home environment. The three articles included were part of a longitudinal and multi-method study, run by myself and my colleague - the Twins, Family and Behaviour study. Accounts were collected from 282 mothers and 132 fathers of twins, over a two-year time period. Parents completed postal questionnaires and a telephone interview, and observations via Skype recorded them interacting with each of their children. The research was unique, as it employed a number of novel measures and sophisticated analyses that have not yet been used within a longitudinal twin sample such as this. Results showed that, contrary to expectations, no mean level differences emerged when monozygotic twin pairs, dizygotic twin pairs, and non-twin pairs were compared on their sibling relationship quality (Paper 1). Behavioural genetic modelling also revealed that sibling interactions were mainly influenced by the shared environment, common to both children within the dyad, but also by the genetic propensities of the siblings themselves (Paper 1). Using the innovative Preschool Five Minute Speech Sample interview, we found that mothers who expressed more family-wide positive, and less family-wide negative, emotion towards their children reported more positivity within the sibling relationship – even when controlling for questionnaire measures of the mother-child relationship (Paper 2). Finally, opposing the majority of past literature, cross-lagged tests evidenced that earlier positivity within the sibling bond was predictive of later marital satisfaction, and of positivity within both the mother-child and the father-child bond (Paper 3). The implications of the findings include: the generalisability of studies of twins in childhood to the wider non-twin sibling population (Paper 1); the usefulness of maternal speech sample measures in capturing unique variance in sibling relationship quality (Paper 2); and the impact of affectionate sibling exchanges on entire family systems (Paper 3). Future research would benefit from exploring the nature of the relationship between twin brothers and sisters further, using both younger and older children's reports of their family interactions, within a more ethnically and socioeconomically diverse sample.
APA, Harvard, Vancouver, ISO, and other styles
4

Prakash, Aruna [Verfasser]. "Computational micromechanics of polycrystals: Special emphasis on twinning and recrystallization in Mg alloys and TWIP steels / Aruna Prakash." Aachen : Shaker, 2010. http://d-nb.info/1122546300/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Darrow, Leslie L. "A program to begin the spiritual formation of the Twain Harte Evangelical Free Church through special and corporate occasions." Theological Research Exchange Network (TREN), 1989. http://www.tren.com.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Kuo, Chang-Yen, and 郭嫦燕. "Parents’ Involvement in Transition Services for Students with Disabilities in Special Education Classroom of Vocational High Schools in Taipei Twin Cities." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/87165260439114133756.

Full text
Abstract:
碩士
國立臺灣師範大學
復健諮商研究所
103
This study aimed to (1)investigate parents with disabilities students in special education classroom of vocational high schools about their understanding and involvement in transition services , and to (2)explore the impact of the demographic backgrounds and family variables on their understanding and involvement. Two hundred and nine parents from Taipei twin cities returned the survey questionnaires. By using the method of descriptive statistics, t-test, one-way ANOVA and multiple regression to analyze the data, results showed that: 1. Most parents had good understanding of transition services. 2. About 60% of parents involved in transition service meeting, but searching for transition services resources is less than 50%. 3. There were no significant differences among parents’ understanding of the transition service. 4. Parents with high school and college degree involved in the transition services at a higher level than parents with lower education background. 5. There was a moderately positive correlation between parents’ understanding and involvement in transition service. Mothers’ level of education, types of children disability, family income and understanding of transition service could be used to explain 38.8% variance in parents’ involvement in transition services for special education in vocational high schools. Based on the research results, researcher provided recommendations for transition service institution, special education schools, teachers, parents, and researchers for further studies.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Twin species"

1

Bently, Peter. Twin trouble. Mankato, Minn: QEB Pub., 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Fields, David. Twins. Philadelphia: Running Press, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Ruth, Sandweiss, and Sandweiss Rachel Dana, eds. Twins. Philadelphia: Running Press, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

McLaury, Barry A. Wilmarth Lake and Twin Lake Watershed assessment final report. [Pierre, S.D.]: South Dakota Dept. of Environment & Natural Resources, Division of Financial & Technical Assistance, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Wallace, Marjorie. The silent twins. South Yarmouth, Ma: J. Curley, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Frost, Scott. The autobiography of FBI special agen Dale Cooper: My life, my tapes. London: Penguin Books, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Wallace, Marjorie. The silent twins. Harmondsworth: Penguin, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

The silent twins. New York: Prentice Hall Press, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Wallace, Marjorie. The silent twins. London: Penguin Books, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

The silent twins. London: Chatto & Windus, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Twin species"

1

Gobeawan, Like, Daniel J. Wise, Sum Thai Wong, Alex T. K. Yee, Chi Wan Lim, and Yi Su. "Tree Species Modelling for Digital Twin Cities." In Transactions on Computational Science XXXVIII, 17–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-63170-6_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Günther, Helmut. "The Twin Paradox." In Elementary Approach to Special Relativity, 167–96. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3168-2_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Nochimson, Martha P. "Substance Abuse: Special Agent Dale Cooper, “What’s the Matter?”." In Return to Twin Peaks, 47–69. New York: Palgrave Macmillan US, 2016. http://dx.doi.org/10.1007/978-1-137-55695-0_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Heltberg, A. "Genetics in Multiple Sclerosis — with Special Emphasis on Twin Studies." In Virology and Immunology in Multiple Sclerosis: Rationale for Therapy, 78–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73032-0_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Wang, Ruiyang, and Matthew S. Bonney. "Novel Data Acquisition Utilising a Flask Python Digital Twin Operational Platform." In Special Topics in Structural Dynamics & Experimental Techniques, Volume 5, 7–13. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-031-05405-1_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Traphöner, Heinrich, Qing Yin, and A. Erman Tekkaya. "Sheet Material Characterization with the In-Plane Torsion Test: Cyclic Loading, Grooved Specimen and Twin Bridge Specimen." In 60 Excellent Inventions in Metal Forming, 17–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46312-3_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bonney, Matthew S., and David Wagg. "Historical Perspective of the Development of Digital Twins." In Special Topics in Structural Dynamics & Experimental Techniques, Volume 5, 15–20. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75914-8_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Newnham, Robert E. "Ferroic crystals." In Properties of Materials. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780198520757.003.0018.

Full text
Abstract:
Twinned crystals are normally classified according to twin-laws and morphology, or according to their mode of origin, or according to a structural basis, but there is another classification that deserves wider acceptance, one that is based on the tensor properties of the orientation states. An advantage of such a classification is the logical relationship between free energy and twin structures, for it becomes immediately apparent which forces and fields will be effective in moving twin walls. The domain patterns in ferroelectric and ferromagnetic materials are strongly affected by external fields, but there are many other types of twinned crystals with movable twin walls and hysteresis. These materials are classified as ferroelastic, ferrobielastic, and various other ferroic species. As explained in the next section, each type of switching arises from a particular term in the free energy function. Ferroic crystals possess two or more orientation states or domains, and under a suitably chosen driving force the domain walls move, switching the crystal from one domain state to another. Switching may be accomplished by mechanical stress (X), electric field (E), magnetic field (H), or some combination of the three. Ferroelectric, ferroelastic, and ferromagnetic materials are well known examples of primary ferroic crystals in which the orientation states differ in spontaneous polarization (P(s)), spontaneous strain (x(s)), and spontaneous magnetization (I(s)), respectively. It is not necessary, however, that the orientation states differ in the primary quantities (strain, polarization, or magnetization) for the appropriate field to develop a driving force for domain walls. If, for example, the twinning rules between domains lead to a different orientation of the elastic compliance tensor, a suitably chosen stress can then produce different strains in the two domains. This same stress may act upon the difference in induced strain to produce wall motion and domain reorientation. Aizu suggested the term ferrobielastic to distinguish this type of response from ferroelasticity, and illustrated the effect with Dauphine twinning in quartz. Other types of secondary ferroic crystals are listed in Table 16.1, along with the difference between domain states, and the driving fields required to switch between states.
APA, Harvard, Vancouver, ISO, and other styles
9

De Rújula, Alvaro. "The Three Relativities." In Enjoy Our Universe, 19–22. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198817802.003.0005.

Full text
Abstract:
Galileo’s and Einstein’s Special and General Relativity are introduced. So is the equivalence principle between gravity and acceleration, the basic assumption of general relativity. A first encounter with the twin paradox of Einstein’s relativity, also called the clock paradox. The twins are further discussed in a subsequent chapter (16).
APA, Harvard, Vancouver, ISO, and other styles
10

"Twins with special needs." In Twin and Triplet Psychology, 61–67. Routledge, 2003. http://dx.doi.org/10.4324/9780203360712-12.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Twin species"

1

Scheibmeir, Jim, and Yashwant Malaiya. "A Social Media-driven Digital Twin of an Invasive Species." In The 10th International Workshop on Simulation for Energy, Sustainable Development & Environment. CAL-TEK srl, 2022. http://dx.doi.org/10.46354/i3m.2022.sesde.002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Sanchez-Guzman, Guillermo, Washington Velasquez, and Manuel S. Alvarez-Alvarado. "Modeling a simulated Forest to get Burning Times of Tree Species using a Digital Twin." In 2022 IEEE 12th Annual Computing and Communication Workshop and Conference (CCWC). IEEE, 2022. http://dx.doi.org/10.1109/ccwc54503.2022.9720768.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Mai, Holger, and André Kaufmann. "Methodology to Evaluate the Characteristics of a Twin-Scroll Turbocharger With Various Approaches for the Computation of Thermodynamic Properties." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63462.

Full text
Abstract:
When it comes to evaluating the thermodynamic and fluid dynamic behavior of a turbocharger (TC) and ensuring the best possible matching to the internal combustion engine, a precise measurement of the characteristic maps is required. Measured on a hot-gas test bench under steady-state conditions, the maps of the compressor and turbine give detailed information about the turbocharger performance and provide boundary conditions for simulating the engine processes of a turbocharged engine. At the moment there is no comprehensive standard on how to measure a TC on a test bench. All existing guidelines such as SAE J1826 & J922 and ASME PTC 10 contain more general information with recommendations, but turbocharger mapping on a hot-gas test bench is highly complex and has a large dependence on heat transfer. The characteristics are not determined directly, but have to be computed using the measured quantities and the thermodynamic properties of the working fluid. For that reason, all influences that may occur during the measurement have to be taken into account for the comparability of different turbochargers or the repeatability for the same turbocharger specimen. As a consequence, this paper deals with the methodology of thermodynamic computation for a mono-scroll and a twin-scroll turbocharger in general and the impact of different approaches for computing the thermodynamic properties of the individual species on compressor and turbine efficiencies in particular. For computing the characteristics of a mono-scroll turbocharger, a methodology is used that matches good practice and state-of-the-art technology. For computing the characteristics of a twin-scroll turbocharger, a new methodology is developed to provide a practical approach for the evaluation of pressure ratios and efficiencies of a twin-entry turbine. The use of the closed-loop unit for the extension of the turbine is included. Computing the thermodynamic state changes, power, and efficiencies of the compressor and turbine requires knowledge of the physicochemical properties of the involved fluids. These fluids are humid air (compressor) and exhaust gas (turbine) and depend on the gas composition, pressure, and especially temperature with respect to the relative humidity. Turbocharger efficiencies are very sensitive to deviations in the thermodynamic properties of the individual species. Different forms of polynomials with different levels of complexity and precision are available in literature. In this paper, the most commonly used polynomials for computing the thermodynamic properties such as caloric perfect gas, humid air, VDI 4670, NASA9, CHEMKIN, NIST, and SAE J1826 will be used for the characteristic maps of a twin-scroll turbocharger. The results will be discussed in terms of the impact on turbocharger efficiencies and the relevance to achieving a desired quality level for turbocharger mapping.
APA, Harvard, Vancouver, ISO, and other styles
4

Fontanili, Luca, Massimo Milani, Luca Montorsi, Letizia Scurani, and Francesco Fabbri. "An Engineering Approach to Model Blood Cells Electrical Characteristics: From Biological to Digital-Twin." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23583.

Full text
Abstract:
Abstract Some of the most effective methods to separate circulating tumor cells (CTCs) from normal blood cells can be implemented using ultra-filtration, and/or electro-magnetic fields. As well known, each biological cell presents, on both sides of its membrane, different concentrations of ionic species that produce an electric charge concentration with respect to the lipid double layer (impermeable to ions). In this way, the bio-cell can be seen as an electric capacitor, which has the lipid double layer acting as an insulator inserted between two conductive plates, concentrated on the lipid double layer inner and outer surfaces. In this paper, firstly, the electrical capacitor equivalent system is used to treat different types of bio-cells normally flowing in blood vessels (red blood cells, lymphocytes and various types of CTCs-like), and to transform their biological characteristics into digital twin information useful for engineering applications. After, the preliminary 3D geometric analysis of the bio-cells shapes allowed to associate each bio-cell to a different capacitor model, and to predict the electric-equivalent dimensions characterizing its electric behavior. Finally, the equivalent capacitor model is used to study the influence of bio-cells characteristics variation on human blood cells, with particular attention devoted to liver and lung CTCs-like ones.
APA, Harvard, Vancouver, ISO, and other styles
5

Hariharan, P., C. Periasamy, and S. R. Gollahalli. "Aspect Ratio Effects on Partially Premixed Flames From Elliptic Burners in Coflow." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13109.

Full text
Abstract:
In this paper, partially premixed flames of propane-hydrogen blends from elliptic burner geometries in coflow environment have been experimentally studied. Two different elliptic burner geometries with aspect ratios (AR) of 3:1 and 4:1 were used. A circular burner with the same discharge area as that of the elliptic burner was employed for comparison. Measurements were taken at stoichiometric and three other equivalence ratios. Global flame characteristics such as visible height, emission indices, and flame radiation were measured. Flame structure data such as transverse profiles of inflame concentrations of combustion products and local flame temperature were also measured at three axial locations in the flame. Results indicate that elliptic burner flames were shorter, more radiating, and produced lower NO and CO emissions than the corresponding circular burner flames. Results from the inflame measurements of NO and CO were in good agreement with the corresponding global data. Further, the 4:1 AR elliptic burners exhibited a twin-jet flame structure at fuel-rich conditions. The twin-flame structure was evident from the inflame measurements of temperature and combustion species. This study suggests that the combination of elliptic burner geometry and coflow reduces NO and CO emissions from combustion systems, which could potentially lead to cleaner environment.
APA, Harvard, Vancouver, ISO, and other styles
6

Bettermann, Hans, and Peter Fischer. "On-Line In-Situ Diagnostics of Processes Within PEM Fuel Cells by Raman Spectroscopy." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33320.

Full text
Abstract:
This contribution intends to show how Raman spectroscopy can be used to pursue processes inside PEM fuel cells. For this, two experimental setups have been worked out. At first a microscope objective was inserted into one bipolar plate. This enabled the detection of hydrogen, oxygen, nitrogen, vaporous and liquid water as well as changes in gas compositions and water distribution induced by an artificial pinhole within the MEA. A multiple-fiber Raman spectrometer with seven twin fibers was then developed to refine the look inside fuel cells. This setup permits the simultaneous record of gas compositions, liquid water and water vapor and how those species do change locally during operation. Beside the collection of data for modelling fuel cell processes, the multiple-fiber setup is primarily considered to monitor degradation processes and pre-stages of membrane damages.
APA, Harvard, Vancouver, ISO, and other styles
7

Sailly, Manon, Charlotte Sarfati, Christine Jaudoin, Lara Cochetel, Raphaël Huot, and Fanny Teisson. "Twin islands." In SIGGRAPH '18: Special Interest Group on Computer Graphics and Interactive Techniques Conference. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3209800.3232902.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

MATVEEV, VADIM N., and OLEG V. MATVEJEV. "Kinematic Solutions to the Twin Paradox in Special Relativity." In Unified Field Mechanics II: Preliminary Formulations and Empirical Tests, 10th International Symposium Honouring Mathematical Physicist Jean-Pierre Vigier. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813232044_0010.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Gautam, Surya Kumar, and Dinesh N. Naik. "Phase retrieval iterative algorithm for a special object." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jtu4a.69.

Full text
Abstract:
Phase retrieval iterative algorithm suffers from non-uniqueness, non-convergence and often shows twin image problem. A case is presented for a special object where PRA reconstructs output free from all the mentioned problems.
APA, Harvard, Vancouver, ISO, and other styles
10

Vasilyev, Boris, Liubov Magerramova, Anton Salnikov, Nikolay Tsykunov, Vladimir Isakov, and Artem Semenov. "Twin-Web Turbine Discs: Part 2 — Fabrication and Processing." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76310.

Full text
Abstract:
The first part of this paper shows that the implementation of twin-web (hollow) discs can lead to an 8–30% decrease in mass or to a cyclic life increase of up to 300%, depending on the size of the disc and the operating conditions. The second part of this paper describes the results of the development of approaches for the manufacturing and processing of twin-web discs, both with the help of additive and traditional manufacturing methods. Several hollow discs with a closed cavity and a slot in the hub are made from the heat-resistant nickel alloy EI698P with the help of additive manufacturing (AM) and hot isostatic pressing (HIP), respectively. Various welding methods are considered for the production of the twin-web discs. The effect of post-processing on the characteristics of the materials is investigated in specimens that were produced with AM methods. Special attention is paid to the surface treatment methods that should be used for discs manufactured by AM methods. The “printed” discs were controlled using radiographic, ultrasonic, fluorescent penetrant, and eddy current methods, and they were examined using computed tomography. As a result, this paper shows that different approaches can be used for the manufacturing and processing of twin-web discs.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Twin species"

1

Lafrancois, Toben, Mark Hove, and Jay Glase. Zebra mussel (Dreissena polymorpha) distribution in Apostle Islands National Lakeshore: SCUBA-based search and removal efforts: 2019–2020. National Park Service, May 2022. http://dx.doi.org/10.36967/nrr-2293376.

Full text
Abstract:
Invasive zebra mussels (Dreissena polymorpha) were first observed in situ at Apostle Islands National Lakeshore (APIS) in 2015. This report builds on 2018 SCUBA surveys and Environmental Protection Agency (EPA) veliger sampling to: 1) determine whether shoals on APIS borders act as sentinel sites to corroborate veliger drift hypotheses about invasion pathways, 2) evaluate ongoing hand-removal of zebra mussels from easily identified structures, and 3) continue efforts to assess native unionid mussel populations, particularly where zebra mussels are also present. Standard catch per unit effort survey methods by SCUBA teams were used to determine the distribution and relative abundance of zebra or quagga mussels (dreissenids) and native mussels (unionids). Zebra mussels were present at densities between 3 and 42 n/diver/hr (number of mussels per diver per hour), while native unionids were present at densities between 5 and 72 n/diver/hr. Shoal surveys (Eagle Island shoal, Sand Island shoal, York Island shoal, Bear Island shoal, Oak Island shoal, and Gull Island shoal) showed zebra mussels were more abundant on the west side of APIS and absent on the easternmost shoal (Gull Island), corroborating veliger work by the EPA that suggested drift from the Twin Ports of Duluth, Minnesota, and Superior, Wisconsin, is one pathway of invasion. Our results support the use of shallow shoals along the periphery of the park as sentinel sites gauging zebra mussel immigration and population dynamics. Zebra mussel densities in the central islands showed no obvious spatial pattern, and this survey cannot determine whether currents or human transport (or both) are invasion vectors. Given the mussels’ continued presence at heavily used mooring areas and docks where there are no zebra mussels on nearby natural features (e.g., Rocky Island dock, Stockton Island mooring areas), our findings are consistent with multiple invasion pathways (drift from the Twin Ports and anthropogenic sources at mooring areas). SCUBA search and removal of zebra mussels from docks was confirmed to be an effective method for significantly lowering the risk of zebra mussels reproducing and dispersing from these locations. We caution that this work is being done on what look like initial invasions at low densities. Repeated removal of zebra mussels by divers reduced numbers to zero at some sites after one year (South Twin docks, Stockton Island NPS docks, and the Ottawa wreck) or decreased numbers by an order of magnitude (Rocky Island docks). Dreissenid densities were more persistent on the Sevona wreck and longer-term work is required to evaluate removal versus recruitment (local and/or veliger drift). Given the size of the wreck, we have tracked detailed survey maps to guide future efforts. Zebra mussels were again observed attached to native mussels near Stockton Island and South Twin Island. Their continued presence on sensitive native species is of concern. Native unionid mussels were more widely distributed in the park than previously known, with new beds found near Oak and Basswood Islands. The work reported here will form the basis for continued efforts to determine the optimal frequency of zebra mussel removal for effective control, as well as evaluate impacts on native species.
APA, Harvard, Vancouver, ISO, and other styles
2

Yarie, John, and Bert R. Mead. Twig and foliar biomass estimation equations for major plant species in the Tanana River Basin of interior Alaska. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1988. http://dx.doi.org/10.2737/pnw-rp-401.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Preliminary design of a special casing joint for a well equipped twin horizontal drainholes in the Oxnard field. Office of Scientific and Technical Information (OSTI), December 1993. http://dx.doi.org/10.2172/10140206.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Twin species' for particular source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography