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Journal articles on the topic "Transect walk"

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Rojas, Alfredo, Koffi Nomedji, and Colin Thor West. "Walking the Line: Conducting Transect Walks in Burkina Faso." Practicing Anthropology 43, no. 1 (2021): 18–21. http://dx.doi.org/10.17730/0888-4552.43.1.18.

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Abstract In this article we present results from transect walks and participatory mapping done in Burkina Faso. Since the Sahelian drought of the 1970s, researchers have continued to depict the Sahelian region of West Africa as an environment experiencing severe degradation; a narrative that persists over time. Recently, however, analyses of satellite imagery have identified remarkable patterns of greening across the Sahel. The causes of this greening are hotly debated. Through this project we aim to inform these debates with on-the-ground perceptions of local farmers and pastoralists. The transect walk method is a community-based process that collects information on the land-use/land-cover (LULC) features across villages. Transects help triangulate data by combining high-resolution satellite imagery, firsthand observations, and local experiences of ecological processes. We describe the methodology behind transects and discuss how they contextualize an otherwise removed process of environmental analysis. We also describe the challenges that arise throughout the fieldwork process.
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Templ, Barbara, Edina Mózes, Matthias Templ, et al. "Habitat-Dependency of Transect Walk and Pan Trap Methods for Bee Sampling in Farmlands." Journal of Apicultural Science 63, no. 1 (2019): 93–115. http://dx.doi.org/10.2478/jas-2019-0014.

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AbstractBees are the most important group of flower visitors providing an essential ecosystem service, namely pollination. Due to the worldwide decline of bees, there should be standardized sampling methods in place to ensure consistent and comparable results between studies. We compared the two commonly used sampling methods of yellow pan traps and transect walk to determine (i) which habitat variables affect the species composition, abundance and species richness of sampled bee communities, (ii) which method potentially contains sampling bias towards some individuals or groups of bees and (iii) the efficiency of sampling in various habitats. We conducted fieldwork in different agricultural habitats distributed along landscape heterogeneity and topography gradients. Our results showed that the height of vegetation, the average number of flowers and the amount of woody vegetation had the greatest influence on the sampling efficiency. Our survey also demonstrated that sampling by transect walk captured less bees in general, especially in stubble, maize, and cereal fields. We found that Apis mellifera and Bombus spp. were well represented in samples collected by the transect walk method, while the abundance of other genera, especially Dasypoda, Hylaeus and Panurgus was higher in pan traps. Based on the results, we suggest (i) the transect walk method to compare samples of flower-visiting wild bee communities from various habitats of different vegetation and flower characteristics, (ii) application of the transect walk or pan traps to compare similar habitats and (iii) adoption of a comprehensive method which would incorporate both sampling techniques to gain a more complex insight into wild bee species composition.
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Della Rocca, Francesca, Pietro Milanesi, Francesca Magna, et al. "Comparison of Two Sampling Methods to Estimate the Abundance of Lucanus cervus with Application of n-Mixture Models." Forests 11, no. 10 (2020): 1085. http://dx.doi.org/10.3390/f11101085.

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Monitoring programs should be based on the measurement of two main pillars for evaluating the conservation status of a species: population size and geographical distribution. To date, the only way reported in the literature to obtain detailed information on L. cervus population size is to use the capture-mark-recapture method. This is an expensive and time-consuming technique that implies physical capture and handling of individuals, which could affect their survival. Therefore, in this study we tested and compared two non-invasive sampling approaches, namely evening walk transects and diurnal tree trunk surveys, to derive accurate abundance estimates by means of N-mixture models in a Bayesian framework. In our study, both methods showed relatively high detection probability (≥56%). However, tree surveys performed better than walk transects (≈80%), especially with the progression of the sampling season. Tree surveys proved to be more effective than walk transects in providing data for an accurate population density estimate (much smaller 95% Bayesian Confidence Intervals). In light of a cost and benefit assessment, the tree survey is undoubtedly more convenient, as well as more effective, as it is more time consuming but less expensive than a walk transect (one operator for 2–3 h vs. two operators for 30 min each). Moreover, it needs fewer expert operators because of the greater proximity to the species, increasing the probability of correctly identifying it, i.e., reducing type I error (false positive or overestimation of counts). For the first time, we applied N-mixture models for estimating population abundance of L. cervus. Overcoming all the limits imposed by the use of the capture-mark-recapture method, in this study we performed a further step forward in the planning of monitoring aimed at the conservation of L. cervus and the evaluation of its demographic trend.
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Walpole, Matthew J., and Ian R. Sheldon. "Sampling butterflies in tropical rainforest: an evaluation of a transect walk method." Biological Conservation 87, no. 1 (1999): 85–91. http://dx.doi.org/10.1016/s0006-3207(98)00037-8.

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Dongre, Amol R., Pradeep R. Deshmukh, and Bishan S. Garg. "Using the ‘transect walk’ as a public health teaching and learning tool." Medical Education 43, no. 11 (2009): 1093–94. http://dx.doi.org/10.1111/j.1365-2923.2009.03483.x.

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Marchewka, Joanna, Guro Vasdal, and Randi O. Moe. "Identifying welfare issues in turkey hen and tom flocks applying the transect walk method." Poultry Science 98, no. 9 (2019): 3391–99. http://dx.doi.org/10.3382/ps/pez211.

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Dooley, Kim E., Catherine Dobbins, and Leslie D. Edgar. "Using Participatory Rural Appraisal for a Community Needs Assessment in Timor-Leste." Journal of International Agricultural and Extension Education 25, no. 4 (2018): 63–73. http://dx.doi.org/10.5191/jiaee.2018.25405.

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Conducting timely and effective needs assessments in the field is important for international development work. In many cases, a researcher has only a couple of hours to build rapport with a community, visually examine the state of the field, and conduct the needs assessment and achieve open, honest, and valid data. Working with translators further constrains the process by cutting available time. Thus, research focused on conducting these types of international assessments is valuable. This study aimed to identify the key needs of the Fatubesi community in Timor-Leste using a combination of techniques for Participatory Rural Appraisal (PRA)—a transect walk and a small group discussion that included guided questions and ranking priorities. PRA is context specific and emphasizes facilitation of co-learning between local knowledge and outside expertise (Toness, 2005). Water, new fencing, and technical training/seeds were identified as the top three priorities for the community and their gardens, and the transect walk revealed issues with infrastructure that provided visual context for the small group discussion. The results of this study reflect the unique challenges faced by many communities in international development settings. The techniques described in this article are beneficial when used together for PRA to shift roles from expert facilitator to local empowerment.
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Lorenzo, Theresa, and Jane Motau. "A Transect Walk to Establish Opportunities and Challenges for Youth with Disabilities in Winterveldt, South Africa." Disability, CBR & Inclusive Development 25, no. 3 (2014): 45. http://dx.doi.org/10.5463/dcid.v25i3.232.

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Mafuta, Wonder, Jethro Zuwarimwe, and Marizvikuru Mwale. "WASH Financial and Social Investment Dynamics in a Conflict-Arid District of Jariban in Somalia." Sustainability 13, no. 9 (2021): 4836. http://dx.doi.org/10.3390/su13094836.

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The paper investigated the social and financial resources’ interface in WASH programmes for vulnerable communities. Nineteen villages were randomly selected from the Jariban district in Somalia using the random number generator based on the village list. Data was collected in a sequential methodology that started with transect walks to observe and record the WASH infrastructure. Thirty-eight focus group discussions and desktop reviews triangulated transact walk recordings. The findings indicate minimum to zero investments towards WASH infrastructure in Jariban from the state government, with more dependency on the donor community. The study revealed that resources for the construction of latrines and water sources come from the following sources, NGOs (54.3%), diaspora community (34.5%) and community contributions (11.2%). The findings revealed a backlog in the WASH infrastructure, resulting in low access to water supply and sanitation services. The results demonstrate limited resource allocation by both the government and community, affecting the WASH infrastructure’s sustainability and further development. Due to the backlog in investments, particularly on improved latrines, it is concluded that their usage is low and a hindrance to having access to sanitation, hygiene and water as per the SDG goals, of leaving no one behind. While investment towards WASH in Jariban demonstrates multiple potential sources, there is a need to strengthen domestic resource mobilisation and explore governments’ role and capacity to secure WASH infrastructure investments. It is also recommended to explore how to tax the remittances to fund WASH infrastructure development and the private sector’s role in WASH infrastructure investment.
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Chalise, Mukesh K., Hideshi Ogawa, and Bishnu Pandey. "Assamese Monkeys in Nagarjun Forest of Shivapuri Nagarjun National Park, Nepal." Tribhuvan University Journal 28, no. 1-2 (2013): 181–90. http://dx.doi.org/10.3126/tuj.v28i1-2.26240.

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The population distribution of Assamese monkey Macaca assamensis were studied in Nagarjun forest of Shivapuri Nagarjun National Park, Nepal and data collected during Dec. 2013 and January 2014, by scan sampling methods along with transect walk through forest trails and ring-road of forest. Sevenbi sexual troops were observed in subtropical/lower temperate forest of Nagarjun forest especially around Raniban forest area. The observed smallest troop was with 9 individuals while the largest troop had 37 (41) individuals of different age. The average troop size is 20.57. Out of three broad age groups adults were 56.31% and immature 43.06% while infant alone were 18.06%. The sex ratio between male and female was 1:1.34. Plant usage for feeding and resting were also enumerated. Nagarjun forest troops use mostly tall trees for the night halts and resting in day time.
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Dissertations / Theses on the topic "Transect walk"

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Alexander, Patrick James. "Environmental sustainability through participatory approaches : socio-geographic assessment of the Mathenjwa tribal authority landscape, Northern KwaZulu-Natal." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/30957.

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Development, environmental sustainability, agriculture and livelihoods are dimensions that are often considered antagonistic. By thinking at the landscape level however, innovative opportunities arise for simultaneity as these entities manifest spatially and require communication across disciplines. Trans-frontier Conservation Areas (TFCAs) embrace this thinking. These are large areas that cut across two or more international boundaries, include within them at least one Protected Area (PA) and other multiple resource use areas, including human dwellings and cultivated areas. Similarly, ecoagriculture is an innovative approach to land use management as it seeks to spatially synergise agriculture, livelihoods and biodiversity conservation across space and requires an awareness of landscape-level issues by land users, a condition which is not necessarily met. Such landscape thinking stems from the fact that if a piece of land is subject to rigorous conservation, it will fail if the surrounding areas are degraded. Additionally, it has been shown that agriculture often benefits from the nearby presence of natural areas for ecosystem services such as pollination, pest management, and erosion control. As such, multifunctional landscape mosaics together with small scale farmers, not large scale monocultures, are the key to global food security, as the former more effectively links agricultural intensification to hunger reduction. In order to ascertain an integrated understanding of the landscape concept, necessary for the formalisation of ecoagriculture, this study assessed the landscape perceptions and understandings held by local people residing within a TFCA. We employed participatory methods within the Mathenjwa Tribal Area (MTA), an area falling within the Lubombo TFCA and identified as holding ecoagriculture potential. Results revealed that local people perceive landscape as a function of subsistence utility. Local people perceive land-use multifunctionality, necessary for the formalisation of ecoagriculture, but at a smaller scale than expected depending on both social and biophysical interpretations. Landscape scale projects should incorporate local landscape understandings.<br>Dissertation (MA)--University of Pretoria, 2013.<br>Geography, Geoinformatics and Meteorology<br>MA<br>Unrestricted
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Spalding, Eckhart, Andrew Skemer, Philip M. Hinz, and John M. Hill. "Infrared photometry with 'wall-eyed' pointing at the Large Binocular Telescope." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622809.

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The brightness and variability of the atmosphere in the thermal infrared poses obstacles to precision photometry measurements. The need to remove atmospheric effects calls for the use of a comparison star, but it is usually impossible to fit both science and comparison targets on current long-wavelength (> 2 mu m) detectors. We present a new pointing mode at the Large Binocular Telescope, which has twin 8.4-m primary mirrors that can be pointed up to similar to 2 arcminutes apart and allow the placement of both targets on a small-field infrared detector. We present an observation of the primary transit of an exoplanet in front of its host star, and use it to provide preliminary constraints on the attainable photometric precision.
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Waldenborg, Micael. "Echocardiographic measurements at Takotsubo cardiomyopathy : transient left ventricular dysfunction." Doctoral thesis, Örebro universitet, Institutionen för hälsovetenskap och medicin, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-35798.

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Takotsubo cardiomyopathy (TTC) is a disease characterized by transient left ventricular (LV) dysfunction and typical wall motion abnormalities in apical parts, without obvious signs of coronary influence. Due to its elusive natural cause and the lack of clarified pathology, further studies are needed. Thirteen patients presented with an episode of TTC, and referred to Örebro University Hospital (USÖ), were prospectively included and investigated by comparisons made at onset (acute phase) against at follow-up three months later (recovery phase). Including echocardiographic measurements, focused on biventricular systolic long-axis function and conventional diastolic function (DF) variables. Systolic improvement was shown, while most DF data were unchanged, suggesting that TTC is mainly a systolic disease affecting both ventricles. Diagnosis should include multidisciplinary engagement, as TTC associates both with emotional stress and pathological markers of physiological stress. In this thesis, such approach was offered to the aforementioned patients; to see if a common denominator could be found, thus, contributing to better handling. Emotional state was assessed, along with an array of cardiac investigations in addition to echocardiography. Acutely, imbalance in the autonomic cardiac control was shown, as well as a trend toward posttraumatic stress, but specific findings allowing conclusions on differential diagnosis could not be demonstrated. By adding another 15 TTC patients (i.e. 28 in total), through collaboration with observers from USA, a retrospective echocardiographic analysis could be done to further study DF; concluding that TTC associates with impairment of conventional DF variables which tends to parallel the systolic recovery, in contrary to the initial result but in line with other causesof LV dysfunction. Magnetic resonance imaging (MRI) is another method of choice at TTC. The USÖ patients had cardiac MRI, thus, a retrospective analysis was done to investigate the effect on LV geometry, both echocardiographic and by MRI; suggesting that TTC is consistently associated with increased LV mass, due to a local impact that seems to follow the change in LVconcentric wall motion.
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Diaz, de Leon Cardenas Alejandra Beatriz del Carmen. "A 'pueblo' that walks together : trust and bonding among Central American transit migrants in Mexico." Thesis, University of Essex, 2018. http://repository.essex.ac.uk/22656/.

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This thesis focuses on the role of social networks, trust, and bonding during the transit of Central American migrants in Mexico. It has two main research questions: first, do existing social networks of Central American transit migrants in Mexico help them overcome the journey through this country? And second, can and do new social bonds, trust, and cooperation emerge in this context of extreme scarcity, stress, and violence? It draws on over five months of multi-sited ethnographic fieldwork on the southern border of Mexico in Tenosique and Palenque; in the northern border in Saltillo and Nogales, and in Tucson in the United States. The dissertation finds that most migrants do not receive emotional help or resources from their kinship ties while in Mexico. It is possible to form social ties with strangers that yield solidarity during volatile contexts, in contrast to what most authors have observed. Migrants on the road form what I call a “transient community of migrantes,” an accidental community that gives everyone a migrante collective identity, a common narrative, and a sense of belonging. This shared understanding favours solidarity, even when migrants do not trust each other. Male migrants react to the violence and stress by forming closer groups that I call familias del camino, road families. These familias quickly create trust and deep bonds and provide practical support for each other. These ties are solid and enable cooperation but are also temporary. These bonds had not been defined previously by the literature. While most authors had assumed that kin or kin-like ties are most useful while migrating, I show that during transit, social networks with non-family members become more relevant. Migrants who travel with their families react to the violence by attempting to reproduce a safe domestic sphere while migrating. In the reproduction of power dynamics that defines the realm of the public and the private, patriarchal gender identities are also reproduced and through those, men are depicted as protectors of the family and women as vulnerable.
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Tamtomo, Kiono Berkah Fajar. "Study of wall velocity gradient and mass transfer on rotating cylinder and finned-cylinder in crossflow." Valenciennes, 2002. https://ged.uphf.fr/nuxeo/site/esupversions/2de35dda-200e-4237-8d4b-574007c70bf2.

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Ce travail porte sur la mesure du frottement pariétal et du transfert de masse, sur un cylindre nu et sur un cylindre muni d'une ailette en rotation perpendiculairement à un écoulement, à l'aide de la méthode polarographique. Les mesures ont été réalisées pour différents nombres de Reynolds et pour différentes valeurs du paramètre α, représentant le rapport entre la vitesse périphérique du cylindre et celle de l'écoulement au loin. Une méthode inverse de transfert de masse a pemis la correction directe des signaux électrochimiques. Le frottement pariétal ainsi obtenu sur le cylindre tourne dans le sens inverse de l'écoulement moyen. La mesure du transfert de masse local autour du cylindre en rotation a permis d'établir une corrélation qui tient compte des effets combinés de la rotation du cylindre et de l'écoulement. Cette corrélation permet d'étendre celle établie dans le cas du transfert de chaleur à une gamme plus grande du nombre de Reynolds. La deuxième partie de ce travail concerne la mesure locale du frottement sur une ailette fixée au cylindre. Les valeurs locales élevées du frottement pariétal sur l'ailette sont interprétées à l'aide du modèle de tourbillon en "fer à cheval". On montre que pour les faibles valeurs de α, l'évolution du frottement instationnaire sur l'ailette est semblable à celle observée dans le cas stationnaire. Lorsque la vitesse de rotation su cylindre augmente, la distribution du frottement pariétal tend vers celle obtenue dans le cas du fluide au repos. L'analogie de Reynolds a permis d'atablir une corrélation entre le nombre de Reynolds de rotation et le nombre de Nusselt moyen calculé sur l'ailette<br>This works deals with the measurement of the wall shear stress and mass transfer around a rotating cylinder alone and a rotating finned cylinder in cross flow by using the polarographic method for different Reynolds numbers and different α (peripheral speed/streamwise velocity). An inverse mass transfer method permits to correct the electronical signal. The corrected wall hear stress around the rotating cylinder show the presence of complex structures, especially in the upstream moving wall region. The mass transfer measured on the rotating cylinder leads to a correlation that takes into account the combined effects of rotation and cross flow. The second part of this work concerns the local measurement of the wall shear stress on the fin fixed to the cylinder. The high values of the wall shear stress measured on the fin are attributed to "horseshoe" vortices. It is shown that for low values of α, the distribution of the unsteady wall shear stress on the fin is similar to that observed in the steady case. Whan the rotation speed increases, the distribution of the wall shear stress tends towards that obtained in fluid at rest. A correlation between the rotation Reynolds number and mean Nusselt number on the fin is proposed by using a Reynolds analogy
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Slabaugh, Carson. "HEAT TRANSFER AUGMENTATION IN A NARROW RECTANGULAR DUCT WITH DIMPLES APPLIED TO A SINGLE WALL." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2172.

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Establishing a clean and renewable energy supply is the preeminent engineering challenge of our time. Turbines, in some form, are responsible for more than 98 percent of all electricity generated in the United State and 100 percent of commercial and military air transport. The operation of these engines is clearly responsible for significant consumption of hydrocarbon fuels and, in turn, emission of green house gases into the atmosphere. With such wide-scale implementation, it is understood that even the smallest increase in the operating efficiency of these machines can lead to enormous improvements over the current energy situation. These effects can extend from a reduction in the emission of greenhouse gases to lessening the nation s dependence of foreign energy sources to lower energy prices for the consumer. The prominent means of increasing engine efficiency is by raising the  Turbine Inlet Temperature  the temperature of the mainstream flow after combustion, entering the first stage of the turbine section. The challenge is presented when these temperatures are forced beyond the allowable limits of the materials inside the machine. In order to protect these components, active cooling and protection methods are employed. The focus of this work is the development of more efficient means of cooling  hot turbine components. In doing so, the goal is to maximize the amount of heat removed by the coolant while minimizing the coolant mass flow rate: by removing a greater amount of heat with a lower coolant mass flow rate, more compressed air is left in the mainstream gas flow for combustion and power generation. This study is an investigation of the heat transfer augmentation through the fully-developed portion of a narrow rectangular duct (AR=2) characterized by the application of dimples to the bottom wall of the channel. Experimental testing and numerical modeling is performed for full support and validation of presented findings. The geometries are studied at channel Reynolds numbers of 20000, 30000, and 40000. The purpose is to understand the contribution of dimple geometries in the formation of flow structures that improve the advection of heat away from the channel walls. Experimental data reported includes the local and Nusselt number augmentation of the channel walls and the overall friction augmentation throughout the length of the duct. Computational results validate local Nusselt number results from experiments, in addition to providing further insight to local flow physics causing the observed surface phenomena. By contributing to a clearer understanding of the effects produced by these geometries, the development of more effective channel-cooling designs can be achieved.<br>M.S.M.E.<br>Department of Mechanical, Materials and Aerospace Engineering<br>Engineering and Computer Science<br>Mechanical Engineering MSME
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Nordgaard, Håvard Bersås. "TRANSIT-TIME FLOWMETRY AND WALL SHEAR STRESSANALYSIS OF CORONARY ARTERY BYPASS GRAFTS : – A clinical and experimental study." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for sirkulasjon og bildediagnostikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11828.

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Haltz, Eloi. "Domain wall dynamics driven by spin-current in ferrimagnetic alloys." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS607.

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Malgré les grands succès de la spintronique de ces dernières années, plusieurs questions demeurent quant à l'efficacité et la rapidité de la manipulation électrique de l’aimantation. Ces problèmes semblent pouvoir être résolus en considérant des nouveaux matériaux plus exotiques mélangeant différents sous-réseaux magnétiques. Les alliages ferrimagnétiques de type terres rares-métaux de transitions sont composés de deux populations magnétiques couplées antiferromagnétiquement. Dans ces matériaux, deux configurations particulièrement intéressantes se distinguent : les points de compensation magnétique et angulaire auxquels l'aimantation ou le moment angulaire totale de l'alliage s’annulent. Dans ces configurations, ces matériaux ferrimagnétiques présentent de nouvelles propriétés très intéressantes tant sur le plan fondamental que technologique. Dans cette thèse, la dynamique d’aimantation dans ces matériaux a été étudié expérimentalement et théoriquement à travers la dynamique de paroi de domaine magnétique par application de courants de spin.Les alliages ferrimagnétiques (comme le TbFeCo ou le GdFeCo) ont été déposés en couche mince par co-évaporation et étudiés en combinant plusieurs méthodes : magnétiques, électriques et optiques ce qui révéla leur grand intérêt spintronic. Des techniques d'imagerie ont montré une organisation en domaines magnétiques, séparés par des parois facilement manipulables. Cette étude des propriétés statiques a également montré l’existence d’un gradient chimique en épaisseur induisant des effets habituellement surfaciques dans la zone centrale de films comme le DMI.La dynamique de paroi sous courant de spin (par couple de transfert de spin et spin-orbite) a été étudiée dans deux études qui ont mis en évidence l'efficacité et la rapidité du contrôle électrique de l’aimantation. L’une d’elles a également révélé une dynamique particulière qui est la signature directe d’un retournement magnétique sans précession à la compensation angulaire.Enfin, un modèle théorique effectif des propriétés statique et dynamique des alliages ferrimagnétiques a été développé et a révélé de nouveaux modes de propagation de paroi comme le retournement sans précession ou la disparition des régimes transitoires<br>Despite the large success of spintronics, several questions remain concerning the improvement of efficiency and speed of the magnetization manipulation by electrical current. Those issues can be addressed through the study of new exotic materials that mix different magnetic sub-lattices. Rare earth-transition metal ferrimagnetic alloys are composed of two different magnetic sub-lattices that are antiferromagneticaly coupled. Specifically, two interesting configurations can emerge called the magnetic and the angular compensation points at which the alloy’s net magnetization or net angular momentum independently vanishes. In these configurations, ferrimagnets seem to present new and very convenient properties which makes them promising for both fundamental and technological point of view. In this thesis, these materials were experimentally and theoretically studied through the prism of magnetic domain wall dynamics driven by spin-currents.Ferrimagnetic alloys (such as TbFeCo or GdFeCo) were grown in thin films by co-evaporation. Their structural and magnetic properties were studied by combining magnetization, electrical and optical methods which have revealed their spintronic value. Imaging techniques showed a perpendicularly magnetized domain organization separated by easily handled domain walls. These statics properties studies also showed a chemical depth gradient which induces surface-like effects in the bulk region of films such as DMI à définir.The domain wall dynamics driven by spin current were investigated in two studies revealing very high efficiency and speed of their electrical manipulation. First, the efficiency of the current manipulation via spin-transfer torque was measured by studying the domain wall motion under combined effects of field and current in the creep regime. Secondly, the domain wall dynamics driven by spin-orbit torque was fully characterized using in-plane fields. This measurement revealed a singular dynamic of the domain wall at the angular compensation point which is the direct signature of the precession-free reversal of the magnetization.Finally, an effective theoretical model of both the static and dynamic properties of ferrimagnets was developed. It allows the description of all the observed experimental results. Using this formalism, we analytically and numerically studied the domain wall dynamics driven by field or spin-currents thus revealing new propagation regimes such as precession-free dynamics or the vanishing of transient motions
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Grollier, Julie. "Renversement d' aimantation par injection d' un courant polarise en spin." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00003941.

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Cette thèse est consacrée à l'étude expérimentale du phénomène de transfert de spin. Ce mécanisme, introduit théoriquement en 1996 par J. Slonczewski, permet d'orienter l'aimantation d'un matériau ferromagnétique sans champ appliqué, mais seulement par injection d'un courant polarisé en spin et transfert de spin vers le matériau considéré. Les fortes densités de courant à injecter pour observer l'effet, de l'ordre de 107 A.cm-2, imposent le recours à des nanostructures. Nous avons suivi deux voies pour caractériser cet effet nouveau de transfert de spin depuis un courant vers une aimantation. D'une part, à l'instar des tout premiers résultats expérimentaux obtenus à Cornell University en 2000, nous avons étudié cet effet dans des piliers magnétiques submicroniques de Co/Cu/Co. Nous avons pu clairement mettre en évidence le renversement d'aimantation par un courant polarisé en spin a champ nul. Ensuite, nous nous sommes intéressés à la dépendance en champ des courants critiques. Cette étude approfondie nous a permis de tracer le diagramme de phase champ-courant, nous fournissant des informations importantes quant aux mécanismes microscopiques à l'origine du phénomène de renversement d'aimantation par injection de spin. La deuxième partie de ma thèse concerne le cas des barreaux de vanne de spin Co/Cu/NiFe dans lesquels la modification d'aimantation est due au déplacement de paroi magnétique induit par transfert de spin à partir d'un courant polarisé en spin. Pour des champs proche de zéro, une paroi magnétique peut être déplacée uniquement sous l'action du courant entre des centres de piégeage et, en accord avec les conclusions du modèle de Berger, le déplacement s'effectue dans des directions opposées pour des courants opposés. La densité de courant critique requise pour déplacer la paroi est de l'ordre de quelques 106 A/cm², un ordre de grandeur plus faible que les courants nécessaires pour entraîner un renversement d'aimantation dans les structures multicouches de type piliers. Ces mesures constituent la première mise en évidence directe et en temps réel de déplacement de parois par transfert de spin dans des nanostructures magnétiques.
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Lamiel, Quentin. "Analysis of spray-wall impingement, fuel film spreading and vaporisation for reciprocating engine applications." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0092/document.

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Le transport routier est responsable d’une partie des émissions de polluants sur la planète. Conscient de ce problème, des lois sur les émissions des véhicules sont régulièrement votées afin de réduire l’impact environnemental du transport automobile. Ces lois de plus en plus restrictives ont poussé les fabricants automobiles à réduire la taille des moteurs essence et à utiliser des procédés d’injection directe afin d’augmenter le ratio puissance/volume des moteurs et réduire la consommation. Cependant avec l’utilisation de l’injection directe, de nouveaux problèmes apparaissent, notamment la production de particules fines, elles-mêmes réglementées. Cette thèse s’inscrit dans ce cadre. En effet, les films liquides engendrés par l’injection de carburant sont identifiés comme principaux responsables de la production de particules. Dans ce contexte, les films liquides sont étudiés expérimentalement à l’aide d’un injecteur haute pression disposant de 3 trous. Les aspects dynamiques de création et d’étalement du film liquides sont étudiés et modélisés. S’en suit une étude thermique de l’interaction entre le spray et la paroi. Afin de caractériser les pertes de chaleur observées lors de l’impact, ces pertes thermiques étant responsables d’un délai dans la vaporisation du carburant et donc d’inhomogénéités du mélange au moment de la combustion, une modélisation de ces pertes et du transfert thermique associé est aussi proposée. Enfin une étude des taux d’évaporation de plusieurs alcanes purs puis de mélanges est proposée. Ces mesures ont servi à la calibration d’un modèle numérique d’évaporation de films fins de carburants sur des parois chaudes. Autour de ces différentes études, une campagne d’essais moteurs a été effectuée. L’objectif est de confirmer que les études expérimentales faites en laboratoires sont bien transposables (moyennant la prise de certaines précautions) aux moteurs automobiles. Les conclusions des différentes études sont finalementproposées<br>The road transport is responsible of a considerable amount of pollutants emissions at the worldwide scale. To tackle this issue, many laws are trying to give a framework to reduce the emissions at the global scale. The law are always more restrictive, and they oriented the car manufacturers to the reduction of their gasoline engine size. This phenomenon, called downsizing, lead to the use of direct injection in order to improve the power/volume ratio of the engine. However, with direct injection the problem of particle emissions arose. Indeed, the liquid film generated during the injection process are responsible of inhomogeneities in the combustion chamber which lead to particles formation. In this context, the study of the fuel films in the combustion chamber is a major concern. To perform this study several experimental apparatus are designed in this thesis. A high-pressure 3-hole solenoid injector is used in order to generate liquid films. The generation and the spreading of the liquid films is observed and modelled. Then the thermal aspects of the spray impingement is studied, to characterise the local heat transfer. These thermal loss are delaying the evaporation of the liquid film, which will lead to inhomogeneities in the combustion chamber and particle generation. A modelling of the heat transfer is also proposed, finally the evaporation rate of alkanes films is proposed. Mono and multicomponents films are studied, these measures were used to calibrate a numerical model for the evaporation of thin liquid films on hot walls. Together with the previous experimental investigationsand models a test campaign on a real engine has been held. The objective is to confirm that, the results produced out of the engine are transposable to the engine (with careful attention). Conclusions on the different aspects are then presented
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Books on the topic "Transect walk"

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Richard, Lee. Get Onboard: Walk in the Shoes of a Transit Operator. Guernica Editions, Incorporated, 2015.

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Nonwork and off-peak trips by transit, walk and bicycle modes: An understanding of existing and potential markets. Illinois Transportation Research Center, 1999.

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Sicari, Rosa, and Raluca Dulgheru. Stress echocardiography: introduction and pathophysiology. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780198726012.003.0011.

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Stress echocardiography is the combination of two-dimensional echocardiography with a physical, pharmacological, or electrical stress. The diagnostic end point for the detection of myocardial ischaemia is the induction of a transient worsening in left ventricular regional function during stress. Among different stress modalities of comparable diagnostic and prognostic accuracy available, semisupine exercise is the most frequently used; dobutamine-the best test for viability assessment; dipyridamole-the safest and simplest pharmacological stress test; and the most suitable for combined wall motion-coronary flow reserve assessment. Identification of viable myocardium and evaluation of severity of valvular heart disease are additional recognized applications of stress echocardiography. In spite of its dependence upon operators’ training, stress echocardiography is today the best (most cost-effective and risk-effective) possible imaging modality to achieve the still elusive target of sustainable cardiac imaging in the field of non-invasive diagnosis of coronary artery disease.
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MacDonald, John, Charles Branas, and Robert Stokes. Changing Places. Princeton University Press, 2019. http://dx.doi.org/10.23943/princeton/9780691195216.001.0001.

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The design of every aspect of the urban landscape—from streets and sidewalks to green spaces, mass transit, and housing—fundamentally influences the health and safety of the communities who live there. It can affect people's stress levels and determine whether they walk or drive, the quality of the air they breathe, and how free they are from crime. This book provides a compelling look at the new science and art of urban planning, showing how scientists, planners, and citizens can work together to reshape city life in measurably positive ways. It demonstrates how well-designed changes to place can significantly improve the well-being of large groups of people. The book argues that there is a disconnect between those who implement place-based changes, such as planners and developers, and the urban scientists who are now able to rigorously evaluate these changes through testing and experimentation. It covers a broad range of structural interventions, such as building and housing, land and open space, transportation and street environments, and entertainment and recreation centers. Science shows we can enhance people's health and safety by changing neighborhoods block-by-block. The book explains why planners and developers need to recognize the value of scientific testing, and why scientists need to embrace the indispensable know-how of planners and developers. It reveals how these professionals, working together and with urban residents, can create place-based interventions that are simple, affordable, and scalable to entire cities.
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Book chapters on the topic "Transect walk"

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Whay, Helen R., Siobhan Mullan, and David C. Main. "Improving animal care and welfare: practical approaches for achieving change." In Improving animal welfare: a practical approach, 3rd ed. CABI, 2021. http://dx.doi.org/10.1079/9781789245219.0314.

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Abstract This chapter addresses the implementation of knowledge to improve animal care and welfare. Topics include the use of animal-based measurements to motivate farmers to reduce lameness and other welfare problems; how to use social marketing methods and innovation methods to promote improvements on the farm; how to use participatory tools such as a seasonal lameness calendar, priority matrix and lameness transect walk; the organization of farmer groups where different farms are visited to share ideas and the effective use of enforcement approaches by either retailers or legislation.
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Momtaz, S., M. Asaduzzaman, and Z. Kabir. "A gendered approach to understanding climate change impacts: lessons from a coastal region of Bangladesh." In Gender, climate change and livelihoods: vulnerabilities and adaptations. CABI, 2021. http://dx.doi.org/10.1079/9781789247053.0002.

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Abstract The purpose of this chapter is to understand the vulnerability of women's livelihoods to climate change impacts in Bangladesh. Data were collected through a survey of 150 randomly selected women from a sample of households. Focus group discussions, key informant interviews, participant observations, and a transect walk, provided supporting information to substantiate the household surveys. The chapter first outlines the theoretical foundation on which the research is based. This is followed by examining women's vulnerability in the study area. The chapter then describes women's coping strategies in the face of climate change-induced disasters. The chapter further explores women's adaptive capacity through the examination of their access to various services. It ends with a set of recommendations for policy makers in order to improve the situation of women's vulnerability.
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Blackshear, Perry L., Gertrude L. Blackshear, and Paul F. Emerson. "Vessel Wall Compliance and Transient Fluid Movement." In Vascular Dynamics. Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-7856-3_16.

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Cebula, Artur. "One-Dimensional Transient Heat Conduction in Plane Wall." In Encyclopedia of Thermal Stresses. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_398.

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Matsumoto, Ayako, and Kouji Yano. "On a Zero-One Law for the Norm Process of Transient Random Walk." In Séminaire de Probabilités XLIII. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15217-7_4.

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Pemantle, Robin, and Yuval Peres. "On which Graphs are All Random Walks in Random Environments Transient?" In Random Discrete Structures. Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4612-0719-1_14.

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Mabhuye, Edmund B., and Pius Z. Yanda. "Locally based responses to impacts of climate change in pastoral landscapes of Northern Tanzania." In Climate change impacts and sustainability: ecosystems of Tanzania. CABI, 2020. http://dx.doi.org/10.1079/9781789242966.0101.

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Abstract The impacts of climate change and variability have manifested themselves throughout the world, but considerable temporal and spatial variations exist across various places and countries. Given the variation in vulnerability, this study was undertaken in pastoral landscapes in northern Tanzania to assess the impacts of climate change, adaptation strategies and their implications to communities' livelihoods and ecosystem integrity. It examined: (i) climate trends and associated impacts on communities' livelihood options; (ii) climate change coping and adaptation strategies adopted by selected communities to reduce the severity of climate change impacts; and (iii) the challenges associated with climate change adaptation strategies in the pastoral landscape. Primary data were collected using household surveys, interviews with key informants, focus group discussions, direct field observation using transect walks and institutional analysis. Secondary data were obtained through documentary review and theme-content analysis. Results indicate that there are slight increases in temperature and wind speed as well as decreasing trends and erratic patterns of rainfall which cause drought and extended dry spells. Fluctuation in temperature and rainfall patterns affects livestock keeping through recurrent drought that has negative implications on pasture and water availability. Communities are responding to the changes through traditional response mechanisms and have embraced a few new adaptation strategies against these climate extremes, particularly drought. Generally, strategies for adaptation are likely to be successful in the near future, subject to review and harmonization of policies, institutional and legal frameworks to harness existing opportunities for management of natural resources for sustainable development and build the long-term balance between ecosystem integrity and human needs.
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Sundfør, Hans Olav, and Peder A. Tyvand. "Transient Free Convection in a Horizontal Porous Cylinder with a Sudden Change in Wall Temperature." In Waves and Nonlinear Processes in Hydrodynamics. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0253-4_23.

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Toksoy, M., and O. Devres. "Integral Transform Solution of a One Dimensional Transient Non-Homogeneous Heat Conduction Problem in the Trombe Wall." In Solar Energy Utilization. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3631-7_33.

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Kato, Masashi, Shun Ichiro Tanaka, Masaya Ichimura, Eisuke Arai, Shun-ichi Nakamura, and Tsunenobu Kimoto. "Optical-Capacitance-Transient Spectroscopy Study for Deep Levels in 4H-SiC Epilayer Grown by Cold Wall Chemical Vapor Deposition." In Materials Science Forum. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-963-6.381.

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Conference papers on the topic "Transect walk"

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Mamoua, Kamal, Ashok Pandit, and Howell H. Heck. "Nutrient Loading in the Indian River Lagoon from Groundwater at the River Walk Transect." In World Environmental and Water Resources Congress 2019. American Society of Civil Engineers, 2019. http://dx.doi.org/10.1061/9780784482346.008.

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Gradeck, Michel, and Michel Lebouche. "LOCAL STRUCTURE OF THE GAS-LIQUID FLOW IN HORIZONTAL CORRUGATED CHANNELS - FLOW PATTERNS AND WALL SHEAR STRESS." In International Symposium on Transient Convective Heat Transfer. Begellhouse, 1996. http://dx.doi.org/10.1615/ichmt.1996.transientconvheattransf.390.

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Alemany, Miguel Angel González. "Improving Public Transport Quality Using Accelerating Moving Walks." In 15th International Conference on Automated People Movers and Automated Transit Systems. American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784479797.011.

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Orlande, Helcio, and Humberto Araujo Machado. "ESTIMATION OF THE TIMEWISE AND SPACEWISE VARIATION OF THE WALL HEAT FLUX TO A NON-NEWTONIAN FLUID IN A PARALLEL PLATE CHANNEL." In International Symposium on Transient Convective Heat Transfer. Begellhouse, 1996. http://dx.doi.org/10.1615/ichmt.1996.transientconvheattransf.520.

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Zidouh, H., and L. Elmaimouni. "Wall shear stress in transient turbulent pipe flow." In 2013 International Renewable and Sustainable Energy Conference (IRSEC). IEEE, 2013. http://dx.doi.org/10.1109/irsec.2013.6529695.

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Iida, Norimasa, Kou Hirawo, and G. Takeshi Sato. "Experimental Study of Transient Gas Jet Impinging on a Wall." In International Congress & Exposition. SAE International, 1990. http://dx.doi.org/10.4271/900479.

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Fakoor-Pakdaman, M., and Majid Bahrami. "Transient Internal Forced Convection Under Step Wall Heat Flux Condition." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17146.

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A new closed-form analytical model is developed to predict transient laminar forced convection inside a circular tube following a time-wise step change in the wall heat flux. The proposed all-time model is based on a blending of two asymptotes; i) short-time asymptote: transient pure conduction in an infinite cylinder and ii) long-time asymptote: steady-state convective heat transfer inside a circular duct. Different fluid velocity profiles are taken into consideration and the model covers: i) Slug Flow (SF); ii) Hydrodynamically Fully Developed Flow (HFDF); and iii) Simultaneously Developing Flow (SDF) conditions. The present model is developed for the entire range of the Fourier and Prandtl numbers. As such, short- and long-time asymptotes for the fluid bulk temperature are obtained. The Nusselt number is defined based on the local temperature difference between the tube wall temperature and the fluid bulk temperature. It is shown that irrespective of the velocity profile, at the initial times the Nusselt number is only a function of time. However, at the steady state condition it depends solely upon the axial location. In addition, during the transient period, the Nusselt number is much higher than that of the long-time response. We also performed an independent numerical simulation using COMSOL Multiphysics to validate the present analytical model. The comparison between the numerical and the present analytical model shows good agreement; a maximum relative difference less than 9.1%.
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Hannah, N., V. Marincioni, Z. Chalabi, and H. Altamirano. "Assessing the performance of Internal Wall Insulation considering transient conditions." In 1st International Conference on Moisture in Buildings 2021. ScienceOpen, 2021. http://dx.doi.org/10.14293/icmb210028.

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Qu, Xiaoyi, and Xiaolei Zou. "Efficiency and Applicability of "Stand Right, Walk Left" Escalator Policy at Mass Transit Station." In The Twelfth COTA International Conference of Transportation Professionals. American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412442.184.

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Wilhelmsson, Carl, Andreas Vressner, Per Tunestål, Bengt Johansson, Gustaf Särner, and Marcus Aldén. "Combustion Chamber Wall Temperature Measurement and Modeling During Transient HCCI Operation." In Powertrain & Fluid Systems Conference & Exhibition. SAE International, 2005. http://dx.doi.org/10.4271/2005-01-3731.

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Reports on the topic "Transect walk"

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Slough, John, Fumio Ohuchi, Richard Milroy, DuWayne L. Smith, Samuel Andreason, and Chris Pihl. Materials Analysis of Transient Plasma-Wall Interactions. Defense Technical Information Center, 2014. http://dx.doi.org/10.21236/ada609812.

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Lehua Pan and G.S. Bodvarsson. Modeling Transport in Fractured Porous Media with the Random-Walk Particle Method: The Transient Activity Range and the Particle-Transfer Probability. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/805566.

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Lewis, Sherman, Emilio Grande, and Ralph Robinson. The Mismeasurement of Mobility for Walkable Neighborhoods. Mineta Transportation Institute, 2020. http://dx.doi.org/10.31979/mti.2020.2060.

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The major US household travel surveys do not ask the right questions to understand mobility in Walkable Neighborhoods. Yet few subjects can be more important for sustainability and real economic growth based on all things of value, including sustainability, affordability, and quality of life. Walkable Neighborhoods are a system of land use, transportation, and transportation pricing. They are areas with attractive walking distances of residential and local business land uses of sufficient density to support enough business and transit, with mobility comparable to suburbia and without owning an auto. Mobility is defined as the travel time typically spent to reach destinations outside the home, not trips among other destinations that are not related to the home base. A home round trip returns home the same day, a way of defining routine trips based on the home location. Trip times and purposes, taken together, constitute travel time budgets and add up to total travel time in the course of a day. Furthermore, for Walkable Neighborhoods, the analysis focuses on the trips most important for daily mobility. Mismeasurement consists of including trips that are not real trips to destinations outside the home, totaling 48 percent of trips. It includes purposes that are not short trips functional for walk times and mixing of different trips into single purposes, resulting in even less useful data. The surveys do not separate home round trips from other major trip types such as work round trips and overnight trips. The major household surveys collect vast amounts of information without insight into the data needed for neighborhood sustainability. The methodology of statistics gets in the way of using statistics for the deeper insights we need. Household travel surveys need to be reframed to provide the information needed to understand and improve Walkable Neighborhoods. This research makes progress on the issue, but mismeasurement prevents a better understanding of the issue.
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