cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Flexible conditioning in generative models of images and video
Creators: name: Harvey, William
Publisher: name: University of British Columbia
Year: 2024

description: Recent advances in the field of deep generative modelling are leading to increasingly faithful models of real-world data including images and videos. Of particular practical interest are conditional generative models, which parameterise conditional probability distributions given data features. Flexibly-conditional generative models are more flexible than conventional conditional models in the sense that they allow any data features to be conditioned on. This makes them applicable to tasks like image inpainting where we want the same model that can, e.g., inpaint the top half of an image, to also be capable of, e.g., inpainting the bottom half. Flexible conditioning has previously been demonstrated for data types including fixed-size images and short videos, but our thesis is that it can be enabled in a much broader variety of settings. The first setting we will consider is long-video generation, which is normally problematic because the data is high-dimensional and compute constraints can prevent our model from conditioning on all possible frames. The second is where the data dimensionality (e.g. number of frames in a video) is stochastic and can depend on what we condition on. We present techniques to enable flexible conditioning in both of these settings. We further show that the resulting models can sometimes improve on baselines in terms of sample quality even for conventional generation tasks. Another barrier to flexibly-conditional modelling has been the computational cost of training any high-quality generative models on moderate- or high-resolution visual data. We therefore end by presenting the first technique to mitigate this cost for the training of flexibly-conditional variational auto-encoders by incorporating pretrained unconditional model weights.
Coronal Holes
Creators: name: Cranmer, Steven R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Coronal holes are the darkest and least active regions of the Sun, as observed both on the solar disk and above the solar limb. Coronal holes are associated with rapidly expanding open magnetic fields and the acceleration of the high-speed solar wind. This paper reviews measurements of the plasma properties in coronal holes and how these measurements are used to reveal details about the physical processes that heat the solar corona and accelerate the solar wind. It is still unknown to what extent the solar wind is fed by flux tubes that remain open (and are energized by footpoint-driven wave-like fluctuations), and to what extent much of the mass and energy is input intermittently from closed loops into the open-field regions. Evidence for both paradigms is summarized in this paper. Special emphasis is also given to spectroscopic and coronagraphic measurements that allow the highly dynamic non-equilibrium evolution of the plasma to be followed as the asymptotic conditions in interplanetary space are established in the extended corona. For example, the importance of kinetic plasma physics and turbulence in coronal holes has been affirmed by surprising measurements from UVCS that heavy ions are heated to hundreds of times the temperatures of protons and electrons. These observations point to specific kinds of collisionless Alfven wave damping (i.e., ion cyclotron resonance), but complete models do not yet exist. Despite our incomplete knowledge of the complex multi-scale plasma physics, however, much progress has been made toward the goal of understanding the mechanisms responsible for producing the observed properties of coronal holes.
description: 61 pages, 12 figures. Accepted by the online journal "Living Reviews in Solar Physics." The abstract has been abbreviated slightly, and some figures are degraded in quality from the official version, which will be available at http://solarphysics.livingreviews.org/
title: Ð£Ð¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ðµ ÑÐ¸ÑÐºÐ°Ð¼Ð¸ Ð² ÑÑÐ°Ð½ÑÐ¿Ð¾ÑÑÐ½Ð¾-ÑÐºÑÐ¿ÐµÐ´Ð¸ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÐºÐ¾Ð¼Ð¿Ð°Ð½Ð¸Ð¸
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
Creators: name: ÐÐ¾Ð²Ð¸ÐºÐ¾Ð²Ð°, ÐÐ¾Ð»Ð¸Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: Ð»Ð¾Ð³Ð¸ÑÑÐ¸ÐºÐ°
ÑÑÐ°Ð½ÑÐ¿Ð¾ÑÑÐ½Ð¾-ÑÐºÑÐ¿ÐµÐ´Ð¸ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÐºÐ¾Ð¼Ð¿Ð°Ð½Ð¸Ñ
Ð³ÑÑÐ·Ð¾Ð¿ÐµÑÐµÐ²Ð¾Ð·ÐºÐ¸
ÑÑÐ°Ð½ÑÐ¿Ð¾ÑÑ
ÑÐºÑÐ¿ÐµÐ´Ð¸ÑÐ¸Ñ
ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ðµ ÑÐ¸ÑÐºÐ°Ð¼Ð¸

description: ÐÐ±ÑÐµÐºÑÐ¾Ð¼ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ ÑÐ²Ð»ÑÐµÑÑÑ ÐÐÐ Â«ÐÐ¢ÐÂ». Ð¦ÐµÐ»ÑÑ Ð²ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ ÑÐ²Ð»ÑÐµÑÑÑ Ð°Ð½Ð°Ð»Ð¸Ð· ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ ÑÐ¸ÑÐºÐ°Ð¼Ð¸ Ð² ÐÐÐ Â«ÐÐ¢ÐÂ» Ð´Ð»Ñ Ð¿ÑÐ¸Ð½ÑÑÐ¸Ñ ÑÐµÑÐµÐ½Ð¸Ñ Ð¾ Ð¼ÐµÑÐ°Ñ Ð¿Ð¾ ÐµÑ ÑÐ»ÑÑÑÐµÐ½Ð¸Ñ. Ð ÑÐ°Ð±Ð¾ÑÐµ Ð±ÑÐ»Ð° Ð´Ð°Ð½Ð° ÑÐ°ÑÐ°ÐºÑÐµÑÐ¸ÑÑÐ¸ÐºÐ° ÑÑÐ½ÐºÐ° ÑÑÐ°Ð½ÑÐ¿Ð¾ÑÑÐ½Ð¾-ÑÐºÑÐ¿ÐµÐ´Ð¸ÑÐ¸Ð¾Ð½Ð½ÑÑ ÑÑÐ»ÑÐ³. ÐÑÐ¾Ð¸Ð·Ð²ÐµÐ´ÐµÐ½ Ð°Ð½Ð°Ð»Ð¸Ð· Ð¾ÑÐ½Ð¾Ð²Ð½ÑÑ Ð¿Ð¾ÐºÐ°Ð·Ð°ÑÐµÐ»ÐµÐ¹ ÐºÐ¾Ð¼Ð¼ÐµÑÑÐµÑÐºÐ¾Ð¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ ÑÑÐ°Ð½ÑÐ¿Ð¾ÑÑÐ½Ð¾-ÑÐºÑÐ¿ÐµÐ´Ð¸ÑÐ¸Ð¾Ð½Ð½Ð¾Ð³Ð¾ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ, Ð¸ Ð´Ð°Ð½Ð° ÐµÐ³Ð¾ Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ð¾Ð½Ð½Ð¾-ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ°Ñ ÑÐ°ÑÐ°ÐºÑÐµÑÐ¸ÑÑÐ¸ÐºÐ°. ÐÑÐ½Ð¾Ð²ÑÐ²Ð°ÑÑÑ Ð½Ð° Ð½Ð°Ð±Ð»ÑÐ´ÐµÐ½Ð¸ÑÑ Ð¸ Ð¼ÐµÑÐ¾Ð´Ðµ ÑÐºÑÐ¿ÐµÑÑÐ½ÑÑ Ð¾ÑÐµÐ½Ð¾Ðº, Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¸Ð»Ð°ÑÑ Ð¸Ð´ÐµÐ½ÑÐ¸ÑÐ¸ÐºÐ°ÑÐ¸Ñ Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»ÑÐ½ÑÑ ÑÐ³ÑÐ¾Ð· ÐÐÐ Â«ÐÐ¢ÐÂ» Ð¿ÑÑÐµÐ¼ ÑÐ¾ÑÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ ÐºÐ°ÑÑÑ ÑÐ¸ÑÐºÐ¾Ð², Ð½Ð°Ð³Ð»ÑÐ´Ð½Ð¾ Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÑÑÑÐµÐ¹ ÑÑÐµÐ¿ÐµÐ½Ñ Ð²ÐµÑÐ¾ÑÑÐ½Ð¾ÑÑÐ¸ Ð¸ Ð·Ð½Ð°ÑÐ¸Ð¼Ð¾ÑÑÐ¸ Ð¾Ð±Ð½Ð°ÑÑÐ¶ÐµÐ½Ð½ÑÑ ÑÐ³ÑÐ¾Ð·. Ð Ð´Ð°Ð½Ð½Ð¾Ð¼ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ð¸ Ð±ÑÐ» Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½ Ð°Ð½Ð°Ð»Ð¸Ð· Ð¸Ð¼ÐµÑÑÐµÐ¹ÑÑ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ ÑÐ¸ÑÐºÐ°Ð¼Ð¸, Ð±ÑÐ»Ð¸ Ð²ÑÐ´ÐµÐ»ÐµÐ½Ñ ÐµÐµ Ð½ÐµÐ´Ð¾ÑÑÐ°ÑÐºÐ¸ Ð¸ Ð¿ÑÐµÐ¸Ð¼ÑÑÐµÑÑÐ²Ð°, ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ñ Ð¼ÐµÑÑ Ð´Ð»Ñ ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð²ÐµÑÐ¾ÑÑÐ½Ð¾ÑÑÐ¸ Ð²Ð¾Ð·Ð½Ð¸ÐºÐ½Ð¾Ð²ÐµÐ½Ð¸Ñ ÐºÐ°Ð¶Ð´Ð¾Ð³Ð¾ Ð¸Ð· Ð½Ð°Ð¸Ð±Ð¾Ð»ÐµÐµ Ð·Ð½Ð°ÑÐ¸Ð¼ÑÑ Ð¸ Ð²ÐµÑÐ¾ÑÑÐ½ÑÑ ÑÐ¸ÑÐºÐ¾Ð². ÐÐ°Ð½Ñ ÑÐµÐºÐ¾Ð¼ÐµÐ½Ð´Ð°ÑÐ¸Ð¸ Ð¿Ð¾ ÑÐ¾ÑÐ¼Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ ÑÐ¸ÑÐºÐ°Ð¼Ð¸.
Unmasking the Missing Links in the Discourses of HIV/AIDS Prevention and Control Policy on the Ground in South Wollo, Ethiopia
Creators: name: Getahun, Abate
Publisher: name: Abyssinia Journal of Business and Social Sciences
Year: 2016

description: Although the whole globe declared war against HIV/AIDS for the last three decades, it has been still infecting and affecting adolescents mainly in sub-Saharan African, including Ethiopia. As a result, it was estimated that over 30 million people were died of HIV/AIDS for the last 30 years up to 2010 in the world. Therefore, this study unmasked the missing links in the Discourses of HIV/AIDS Prevention and Control policy on the ground. To unpack the problem, pragmatic paradigm, mixed research design, and methods were employed. Data were collected in the natural settings of Dessie zuria, Kutaber and Tehuledere districts in south Wollo by using both qualitative and quantitative data gathering techniques. The analysis was done on emerging and existing discourses in connection with Knowledge, Attitude and Practice/Skills (KAP), Abstinence, Be faithful and Condom use (ABC) and People Living with and HIV/AIDS (PLWHA). Moreover, risks posing social practices were given meticulous attention to unpack the subtle power and KAP differences gearing towards the emerging discourses which have been enacted, inculcated, reproduced and consumed in the society. The overall results revealed that there were lacks of potent communication effectiveness in bringing realistic changes in behavior towards sexuality, HIV/AIDS, ABC&PLWHAs. Therefore, pragmatic social vaccines of HIV/AIDS should be designed and implemented through life skills trainings to assure Zero new HIV related infection, Zero HIV/AIDS related discrimination and Zero AIDS related death.
description: Abyssinia Journal of Business and Social Sciences , Vol. 1 No. 1 (2016)
title: ÐÐ¸Ð´ÑÐ¾Ð¼ÐµÑ Ð°Ð½Ð¸ÑÐµÑÐºÐ°Ñ ÑÑÐ°Ð½ÑÐ¼Ð¸ÑÑÐ¸Ñ Ð»ÐµÐ³ÐºÐ¾Ð²Ð¾Ð³Ð¾ Ð°Ð²ÑÐ¾Ð¼Ð¾Ð±Ð¸Ð»Ñ Ñ ÐºÐ¾Ð»ÐµÑÐ½Ð¾Ð¹ ÑÐ¾ÑÐ¼ÑÐ»Ð¾Ð¹ 4Ñ 2
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
Creators: name: ÐÑÐ·Ð½ÐµÑÐ¾Ð², ÐÐ»Ð°Ð´Ð¸Ð¼Ð¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: Ð³Ð¸Ð´ÑÐ¾Ð¼ÐµÑ Ð°Ð½Ð¸ÑÐµÑÐºÐ°Ñ ÑÑÐ°Ð½ÑÐ¼Ð¸ÑÑÐ¸Ñ Ð°Ð²ÑÐ¾Ð¼Ð¾Ð±Ð¸Ð»Ñ
Ð¿Ð»Ð°Ð½ÐµÑÐ°ÑÐ½Ð°Ñ ÐºÐ¾ÑÐ¾Ð±ÐºÐ° Ð¿ÐµÑÐµÐ´Ð°Ñ
ÑÐ¸Ð½ÑÐµÐ· ÑÑ ÐµÐ¼Ñ
ÐºÐ¸Ð½ÐµÐ¼Ð°ÑÐ¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ°ÑÑÑÑ
Ð¿ÑÐ¾ÑÐ½Ð¾ÑÑÐ½ÑÐµ ÑÐ°ÑÑÑÑÑ

description: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ð° Ð³Ð¸Ð´ÑÐ¾Ð¼ÐµÑÐ°Ð½Ð¸ÑÐµÑÐºÐ°Ñ ÑÑÐ°Ð½ÑÐ¼Ð¸ÑÑÐ¸Ñ Ð´Ð»Ñ Ð»ÐµÐ³ÐºÐ¾Ð²Ð¾Ð³Ð¾ Ð°Ð²ÑÐ¾Ð¼Ð¾Ð±Ð¸Ð»Ñ Ñ Ð¿ÑÐ¸Ð²Ð¾Ð´Ð¾Ð¼ Ð½Ð° Ð¿ÐµÑÐµÐ´Ð½Ð¸Ðµ ÐºÐ¾Ð»ÑÑÐ°. Ð Ð°ÑÑÑÑÐ½Ð°Ñ Ð¼Ð¾ÑÐ½Ð¾ÑÑÑ Ð´Ð²Ð¸Ð³Ð°ÑÐµÐ»Ñ - 112 ÐºÐÑ. Ð¢ÑÐ°Ð½ÑÐ¼Ð¸ÑÑÐ¸Ñ Ð²ÐºÐ»ÑÑÐ°ÐµÑ Ð² ÑÐµÐ±Ñ ÐºÐ¾Ð¼Ð¿Ð»ÐµÐºÑÐ½ÑÐ¹ Ð³Ð¸Ð´ÑÐ¾ÑÑÐ°Ð½ÑÑÐ¾ÑÐ¼Ð°ÑÐ¾Ñ, Ð¿Ð»Ð°Ð½ÐµÑÐ°ÑÐ½ÑÑ ÐºÐ¾ÑÐ¾Ð±ÐºÑ Ð¿ÐµÑÐµÐ´Ð°Ñ, Ð¾Ð±ÐµÑÐ¿ÐµÑÐ¸Ð²Ð°ÑÑÑÑ Ð¿ÑÑÑ Ð¿ÐµÑÐµÐ´Ð°Ñ Ð²Ð¿ÐµÑÑÐ´ Ð¸ Ð¾Ð´Ð½Ñ Ð½Ð°Ð·Ð°Ð´, Ð³Ð»Ð°Ð²Ð½ÑÑ Ð¿ÐµÑÐµÐ´Ð°ÑÑ, Ð¼ÐµÐ¶ÐºÐ¾Ð»ÑÑÐ½ÑÐ¹ Ð´Ð¸ÑÑÐµÑÐµÐ½ÑÐ¸Ð°Ð» Ð¸ Ð²ÐµÐ´ÑÑÐ¸Ðµ Ð²Ð°Ð»Ñ Ð½Ð° Ð¿ÑÐ¸Ð²Ð¾Ð´ Ð¿ÐµÑÐµÐ´Ð½Ð¸Ñ ÐºÐ¾Ð»ÑÑ. ÐÐ¾ÑÐ¾Ð±ÐºÐ° Ð¿ÐµÑÐµÐ´Ð°Ñ, ÑÐºÐ¾Ð¼Ð¿Ð¾Ð½Ð¾Ð²Ð°Ð½Ð½Ð°Ñ Ð² Ð¾Ð´Ð½Ð¾Ð¼ ÐºÐ°ÑÑÐµÑÐµ Ñ Ð³Ð¸Ð´ÑÐ¾ÑÑÐ°Ð½ÑÑÐ¾ÑÐ¼Ð°ÑÐ¾ÑÐ¾Ð¼, Ð³Ð»Ð°Ð²Ð½Ð¾Ð¹ Ð¿ÐµÑÐµÐ´Ð°ÑÐµÐ¹ Ð¸ Ð´Ð¸ÑÑÐµÑÐµÐ½ÑÐ¸Ð°Ð»Ð¾Ð¼ Ð¸Ð¼ÐµÐµÑ ÑÐ»Ð°Ð½ÑÐµÐ²Ð¾Ðµ ÑÐ¾ÐµÐ´Ð¸Ð½ÐµÐ½Ð¸Ðµ Ñ Ð´Ð²Ð¸Ð³Ð°ÑÐµÐ»ÐµÐ¼ ÑÐµÑÐµÐ· Ð¿ÑÐ¾Ð¼ÐµÐ¶ÑÑÐ¾ÑÐ½ÑÑ Ð¿Ð»Ð¸ÑÑ Ð¸ ÑÐ°ÑÐ¿Ð¾Ð»Ð°Ð³Ð°ÐµÑÑÑ Ð² Ð¿Ð¾Ð´ÐºÐ°Ð¿Ð¾ÑÐ½Ð¾Ð¼ Ð¿ÑÐ¾ÑÑÑÐ°Ð½ÑÑÐ²Ðµ Ð°Ð²ÑÐ¾Ð¼Ð¾Ð±Ð¸Ð»Ñ. Ð¢ÑÐ°Ð½ÑÐ¼Ð¸ÑÑÐ¸Ñ Ð¸Ð¼ÐµÐµÑ Ð³Ð¸Ð´ÑÐ°Ð²Ð»Ð¸ÑÐµÑÐºÐ¾Ðµ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ðµ, Ð¿ÑÐµÐ´ÑÑÐ¼Ð¾ÑÑÐµÐ½Ð° Ð±Ð»Ð¾ÐºÐ¸ÑÐ¾Ð²ÐºÐ° Ð³Ð¸Ð´ÑÐ¾ÑÑÐ°Ð½ÑÑÐ¾ÑÐ¼Ð°ÑÐ¾ÑÐ°. ÐÑÐ¿Ð¾Ð»Ð½ÐµÐ½ Ð¿ÑÐ¾ÐµÐºÑÐ¸ÑÐ¾Ð²Ð¾ÑÐ½ÑÐ¹ ÑÑÐ³Ð¾Ð²ÑÐ¹ ÑÐ°ÑÑÑÑ ÑÑÐ°Ð½ÑÐ¼Ð¸ÑÑÐ¸Ð¸, ÑÐ¸Ð½ÑÐµÐ· ÑÑÐµÐ¼Ñ ÐºÐ¾ÑÐ¾Ð±ÐºÐ¸ Ð¿ÐµÑÐµÐ´Ð°Ñ Ñ Ð´Ð²ÑÐ¼Ñ ÑÑÐµÐ¿ÐµÐ½ÑÐ¼Ð¸ ÑÐ²Ð¾Ð±Ð¾Ð´Ñ. ÐÑÐ¾Ð¸Ð·Ð²ÐµÐ´ÑÐ½ ÐµÑ ÐºÐ¸Ð½ÐµÐ¼Ð°ÑÐ¸ÑÐµÑÐºÐ¸Ð¹ Ð¸ ÑÐ¸Ð»Ð¾Ð²Ð¾Ð¹ ÑÐ°ÑÑÑÑÑ. ÐÑÐ¿Ð¾Ð»Ð½ÐµÐ½ Ð¿Ð¾Ð²ÐµÑÐ¾ÑÐ½ÑÐ¹ ÑÑÐ³Ð¾Ð²ÑÐ¹ ÑÐ°ÑÑÑÑ Ð°Ð²ÑÐ¾Ð¼Ð¾Ð±Ð¸Ð»Ñ, Ð¾Ð¿ÑÐµÐ´ÐµÐ»ÐµÐ½Ñ ÑÑÐ³Ð¾Ð²Ð°Ñ Ð¸ ÑÐ°Ð·Ð³Ð¾Ð½Ð½Ð°Ñ ÑÐ°ÑÐ°ÐºÑÐµÑÐ¸ÑÑÐ¸ÐºÐ¸. ÐÑÐ½Ð¾Ð²Ð½ÑÐµ Ð´ÐµÑÐ°Ð»Ð¸ ÑÑÐ°Ð½ÑÐ¼Ð¸ÑÑÐ¸Ð¸ â Ð·ÑÐ±ÑÐ°ÑÑÐµ Ð¿ÐµÑÐµÐ´Ð°ÑÐ¸, Ð²Ð°Ð»Ñ, Ð¿Ð¾Ð´ÑÐ¸Ð¿Ð½Ð¸ÐºÐ¸ Ð¸ ÑÑÐ¸ÐºÑÐ¸Ð¾Ð½Ð½ÑÐµ ÑÐ»ÐµÐ¼ÐµÐ½ÑÑ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ ÑÐ°ÑÑÑÐ¸ÑÐ°Ð½Ñ Ð½Ð° Ð¿ÑÐ¾ÑÐ½Ð¾ÑÑÑ Ð¸ Ð´Ð¾Ð»Ð³Ð¾Ð²ÐµÑÐ½Ð¾ÑÑÑ.
Topological aspects of poset spaces
Creators: name: Mummert, Carl
name: Stephan, Frank
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Topology (math.GN)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 06B35 (Primary), 54A99 (Secondary), 06A10 (Secondary)

description: We study two classes of spaces whose points are filters on partially ordered sets. Points in MF spaces are maximal filters, while points in UF spaces are unbounded filters. We give a thorough account of the topological properties of these spaces. We obtain a complete characterization of the class of countably based MF spaces: they are precisely the second-countable T_1 spaces with the strong Choquet property. We apply this characterization to domain theory to characterize the class of second-countable spaces with a domain representation.
description: 29 pages. To be published in the Michigan Mathematical Journal
Secrecy capacity of a class of orthogonal relay eavesdropper channels
Creators: name: Aggarwal, Vaneet
name: Sankar, Lalitha
name: Calderbank, A. Robert
name: Poor, H. Vincent
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The secrecy capacity of relay channels with orthogonal components is studied in the presence of an additional passive eavesdropper node. The relay and destination receive signals from the source on two orthogonal channels such that the destination also receives transmissions from the relay on its channel. The eavesdropper can overhear either one or both of the orthogonal channels. Inner and outer bounds on the secrecy capacity are developed for both the discrete memoryless and the Gaussian channel models. For the discrete memoryless case, the secrecy capacity is shown to be achieved by a partial decode-and-forward (PDF) scheme when the eavesdropper can overhear only one of the two orthogonal channels. Two new outer bounds are presented for the Gaussian model using recent capacity results for a Gaussian multi-antenna point-to-point channel with a multi-antenna eavesdropper. The outer bounds are shown to be tight for two sub-classes of channels. The first sub-class is one in which the source and relay are clustered and the and the eavesdropper receives signals only on the channel from the source and the relay to the destination, for which the PDF strategy is optimal. The second is a sub-class in which the source does not transmit to the relay, for which a noise-forwarding strategy is optimal.
description: Submitted to Eurasip Journal on Wireless Communications and Networking special issue on Wireless physical layer security, Dec. 2008, Revised Jun. 2009
Impacts of Recreational Cannabis Legalization on Cannabis Use and Outcomes
Creators: name: Zellers, Stephanie
name: VRIEZE, SCOTT
name: Ross, J. Megan
name: Ellingson, Jarrod
name: Hewitt, John
name: hopfer, christian
name: McGue, Matt
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Clinical Psychology
subject: Psychiatry and Psychology
subject: Medicine and Health Sciences
subject: Developmental Psychology
subject: Life Sciences
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology
subject: Genetics and Genomics
subject: cannabis
subject: marijuana
subject: recreational marijuana legalization

description: Our project will evaluate similarities and differences in cannabis use, dependence, and consequences of use before and after recreational cannabis legalization. We will utilize data from two sites (Minnesota and Colorado; collectively referred to as the CO-MN project) with different cannabis laws and comparably assessed longitudinal twin samples spanning the years prior to and after changes to the legal status of cannabis. Earlier assessments from Minnesota and Colorado were conducted entirely independently, and the CO-MN project assesses the two samples identically to facilitate the study of legalization effects. The rich prospective data prior to legalization will allow for the examination of changes in use following legalization, as well as evaluation of pre-existing differences. We will contextualize our results by studying the sources (genetic, familial environment, and other environment), magnitude, and direction of these relationships in various legal environments. We will also examine the degree to which cannabis dependence and consequences of use vary as a function of legal landscape. We will use individual level regressions adjusting for family stratification, co-twin control regressions, and biometric analyses. The file named "DATE_LegalizationPreregstration" contains background, gaps in research we will fill, research questions and project aims, sample information and measures, analytic plan including equations and covariates, illustrative figures, and references.
Stemonitis fusca var. nigrescens Torrend 1908
Creators: name: Kluša, Julita
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Protozoa
Mycetozoa
Myxomycetes
Stemonitidales
Stemonitidaceae
Stemonitis
Stemonitis fusca
Stemonitis fusca var. nigrescens (rex) torrend

description: ● Stemonitis fusca var. nigrescens (Rex) Torrend,
tumsnējsīkā vālenīte (šokolādes gļotsēne)
- leg. V.Sīmansone, 22 Aug 2023, Sēja p., on leaf litter in an aspen-spruce forest, det. J. Kluša, 2023; (JK), one locality.
description: Published as part of Kluša, Julita, 2023, Complete Checklist Of Myxomycetes In Latvia, pp. 127-151 in Acta Biologica Universitatis Daugavpiliensis 23 (2) on pages 127-151, DOI: 10.59893/abud.23(2).002, http://zenodo.org/record/12650118
title: Ð¡Ð¾Ð²ÐµÑÑÐµÐ½ÑÑÐ²Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð±Ð°Ð·Ñ Ð´Ð°Ð½Ð½ÑÑ Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»ÑÐ½Ð¾ Ð¾Ð¿Ð°ÑÐ½ÑÑ Ð¾Ð±ÑÐµÐºÑÐ¾Ð² Ð² ÑÐµÐ²ÐµÑÐ¾-Ð·Ð°Ð¿Ð°Ð´Ð½Ð¾Ð¼ ÑÐµÐ³Ð¸Ð¾Ð½Ðµ
title: Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÑÐºÐ°Ñ ÑÐ°Ð±Ð¾ÑÐ°
titleType: Subtitle
Creators: name: ÐÐ¸ÐºÐ¸ÑÐ¸Ð½Ð°, ÐÐ°ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2017
Subjects: Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»ÑÐ½Ð¾ Ð¾Ð¿Ð°ÑÐ½ÑÐµ Ð¾Ð±ÑÐµÐºÑÑ
Ð¾Ð¿Ð°ÑÐ½ÑÐµ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²ÐµÐ½Ð½ÑÐµ Ð¾Ð±ÑÐµÐºÑÑ
Ð±Ð°Ð·Ð° Ð´Ð°Ð½Ð½ÑÑ
ÑÐµÐ»ÑÑÐ¸Ð¾Ð½Ð½Ð°Ñ Ð±Ð°Ð·Ð° Ð´Ð°Ð½Ð½ÑÑ
Ð°ÑÑÐ¸Ð±ÑÑ

description: Ð ÑÐ°Ð±Ð¾ÑÐµ Ð¿ÑÐ¾Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ñ Ð½Ð¾ÑÐ¼Ð°ÑÐ¸Ð²Ð½Ð¾-Ð¿ÑÐ°Ð²Ð¾Ð²ÑÐµ Ð´Ð¾ÐºÑÐ¼ÐµÐ½ÑÑ Ð¾ Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»ÑÐ½Ð¾ Ð¾Ð¿Ð°ÑÐ½Ð¾Ð¼ Ð¾Ð±ÑÐµÐºÑÐ°Ñ, ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ ÐºÐ»Ð°ÑÑÐ¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¸ Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»ÑÐ½Ð¾ Ð¾Ð¿Ð°ÑÐ½ÑÑ Ð¾Ð±ÑÐµÐºÑÐ¾Ð² Ð¸ Ð±Ð°Ð· Ð´Ð°Ð½Ð½ÑÑ, ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ð° Ð¾Ð±Ð¾Ð»Ð¾ÑÐºÐ° Ð¸ ÑÐ¾Ð´ÐµÑÐ¶Ð°Ð½Ð¸Ðµ ÑÐµÐ»ÑÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ Ð±Ð°Ð·Ñ Ð´Ð°Ð½Ð½ÑÑ Ð´Ð»Ñ Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»ÑÐ½Ð¾ Ð¾Ð¿Ð°ÑÐ½ÑÑ Ð¾Ð±ÑÐµÐºÑÐ¾Ð² Ð² Ð¡ÐµÐ²ÐµÑÐ¾-ÐÐ°Ð¿Ð°Ð´Ð½Ð¾Ð¼ ÑÐµÐ³Ð¸Ð¾Ð½Ðµ.
Additional file 1 of Clinical findings and genetic analysis of patients with copy number variants involving 17p13.3 using a single nucleotide polymorphism array: a single-center experience
Creators: name: Liang, Bin
name: Yu, Donghong
name: Zhao, Wantong
name: Wang, Yan
name: Wu, Xiaoqing
name: Chen, Lingji
name: Lin, Na
name: Huang, Hailong
name: Xu, Liangpu
Publisher: name: figshare
Year: 2023
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1: Single nucleotide polymorphism array results of eight cases with 17p13.3 copy number variants identified in our study.
Habitable Zones for Earth-mass Planets in Multiple Planetary Systems
Creators: name: Jianghui, Ji
name: Lin, Liu
name: Kinoshita, H.
name: Guangyu, Li
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We perform numerical simulations to study the Habitable zones (HZs) and dynamical structure for Earth-mass planets in multiple planetary systems. For example, in the HD 69830 system, we extensively explore the planetary configuration of three Neptune-mass companions with one massive terrestrial planet residing in 0.07 AU $\leq a \leq$ 1.20 AU, to examine the asteroid structure in this system. We underline that there are stable zones of at least $10^5$ yr for low-mass terrestrial planets locating between 0.3 and 0.5 AU, and 0.8 and 1.2 AU with final eccentricities of $e < 0.20$. Moreover, we also find that the accumulation or depletion of the asteroid belt are also shaped by orbital resonances of the outer planets, for example, the asteroidal gaps at 2:1 and 3:2 mean motion resonances (MMRs) with Planet C, and 5:2 and 1:2 MMRs with Planet D. In a dynamical sense, the proper candidate regions for the existence of the potential terrestrial planets or HZs are 0.35 AU $< a < $ 0.50 AU, and 0.80 AU $< a < $ 1.00 AU for relatively low eccentricities, which makes sense to have the possible asteroidal structure in this system.
description: 4 pages, 1 figures, accepted to IAU 249. Proceeding of IAU S249: Exoplanets: Detection, Formation and Dynamics, in press
Automatic Early Detection and Classification of Leukemia from Microscopic Blood Image
Creators: name: Dese Gebremeskel, Kokeb
name: Chung Kwa, Timothy
name: Raj, K. Hakkins
name: Ayana Zewdie, Gelan
name: Yemaneh Shenkute, Tilahun
name: Addisu Maleko, Wondimagegn
Publisher: name: Abyssinia Journal of Engineering and Computing
Year: 2021

description: Leukemia is a form of blood cancer that affects white blood cells, and is one of the leading causes of death among humans. Currently, diagnosis of leukemia is done through visual inspection of microscopic images of blood cell, which is time consuming, tedious, and requires trained human experts. Therefore, the lack of an automatic, early, and effective leukemia detection system is a great challenge in Ethiopian hospitals. The main objective of this research is to develop an automatic early detection, and classification system to diagnose leukemia from blood image using machine learning and image processing algorithm. To do the research, 400 leukemic blood images and 50 normal blood images had acquired from Jimma University Specialized Hospital using digital microscope, and preprocessed with contrast enhancement. K-means image segmentation and feature extraction were applied by the system. Multi Class Support Vector Machine has used to provide detection and classification of leukemia disease based on the extracted features parameter. The leukemia disease detection and classification accuracy achieved by developed system is 94.62%. Moreover, 94.17% sensitivity and 100% specificity level has been gained by the system. It takes an average of one minute to provide the diagnosis result. The potential of digital image analysis for leukemia disease diagnosis using artificial intelligence; which is not tedious and time consuming is very beneficial when compared to the manual method. In the future, direct diagnosing system of leukemia without staining process is recommended.
description: Abyssinia Journal of Engineering and Computing, Vol. 1 No. 1 (2021)
Organic Feed Grains and Livestock: Factors That Influence Outcomes in Thinly Traded Markets
Creators: name: Hadachek, Jeffrey
name: Saitone, Tina L.
name: Sexton, Richard J.
name: Raszap Skorbiansky, Sharon
name: Thornsbury, Suzanne
name: Effland, Anne
name: Hadachek, Jeffrey
name: Saitone, Tina L.
name: Sexton, Richard J.
name: Raszap Skorbiansky, Sharon
name: Thornsbury, Suzanne
name: Effland, Anne
Publisher: name: Unknown
Year: 2022
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: Industrial Organization
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Productivity Analysis
subject: Public Economics
subject: Risk and Uncertainty
subject: contracts
subject: coordination
subject: competition
subject: modern agricultural markets
subject: organic
subject: thin markets
subject: dairy
subject: beef

description: Even as organic products have become more widely available, most organic growers in the United States still participate in niche markets, with few buyers and sellers and few trades being executed at a given area or point in time, relative to conventional segments of the market. Despite an increase in both organic production and available information to support decision making, growers continue to face challenges related to the thinness of organic markets. This report examines organic dairy and beef markets, including major feed inputs, to assess the current competitive status of these markets. Specifically, in each market, this report considers factors fundamental to determining whether buyers and sellers can form long-term, mutually beneficial buyer/seller relationships that may limit thin market challenges that might otherwise arise.
Optimization of Phototherapy Machine for Advanced Treatment of Neonatal Jaundice
Creators: name: Daba Nemomssa, Hundessa
name: Lingaiha, Bheema
name: Alemayehu, Wasihun
Publisher: name: Abyssinia Journal of Engineering and Computing
Year: 2021

description: Neonatal Jaundice is a medical condition in which high number of unconjugated bilirubin exists in infant’s blood resulting in yellowish colour of baby’s skin and whites of the eye. Unconjugated bilirubin is potentially toxic to neural tissue both brain and spinal cord. Entry of unconjugated bilirubin into the brain can cause both short-term and long-term neurological dysfunction, bilirubin encephalopathy, which needs serious attention. Even though hospitals use phototherapy machine to treat jaundice, there are a number of gaps on the machine related to its effectiveness. Among the gaps long hospitalization time, biological hazards from strong optical radiation and limitation to higher hospitals are the major ones. The main objective of this research was to optimize phototherapy machine for advanced treatment of neonatal jaundice. Before optimization activities, necessary clinical study was performed and the results from the clinical study were used as an input for optimization work. The optimization work included integration of non-invasive bilirubin measurement, light intensity measurement, back treatment and different power supply options to overcome the gaps. The actual device using 465 nm light emitting diode was developed and tested against specifications. Non-invasive measurement system avoids invasive bilirubin measurement, comfortable and makes tracking treatment progress easier. Addressing all skin surface of a baby by the device improves treatment efficiency and plays vital role in baby to mother bond as it reduces treatment time.
description: Abyssinia Journal of Engineering and Computing, Vol. 1 No. 1 (2021)
A Hilbert space approach to effective resistance metric
Creators: name: Jorgensen, Palle E. T.
name: Pearse, Erin P. J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Functional Analysis (math.FA)
subject: Dynamical Systems (math.DS)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 05C75, 31C20, 46E22, 47B25, 47B32, 60J10 (Primary) 31C35, 47B39, 82C41 (Secondary)

description: A resistance network is a connected graph $(G,c)$. The conductance function $c_{xy}$ weights the edges, which are then interpreted as conductors of possibly varying strengths. The Dirichlet energy form $\mathcal E$ produces a Hilbert space structure (which we call the energy space ${\mathcal H}_{\mathcal E}$) on the space of functions of finite energy. We use the reproducing kernel $\{v_x\}$ constructed in \cite{DGG} to analyze the effective resistance $R$, which is a natural metric for such a network. It is known that when $(G,c)$ supports nonconstant harmonic functions of finite energy, the effective resistance metric is not unique. The two most natural choices for $R(x,y)$ are the ``free resistance'' $R^F$, and the ``wired resistance'' $R^W$. We define $R^F$ and $R^W$ in terms of the functions $v_x$ (and certain projections of them). This provides a way to express $R^F$ and $R^W$ as norms of certain operators, and explain $R^F \neq R^W$ in terms of Neumann vs. Dirichlet boundary conditions. We show that the metric space $(G,R^F)$ embeds isometrically into ${\mathcal H}_{\mathcal E}$, and the metric space $(G,R^W)$ embeds isometrically into the closure of the space of finitely supported functions; a subspace of ${\mathcal H}_{\mathcal E}$. Typically, $R^F$ and $R^W$ are computed as limits of restrictions to finite subnetworks. A third formulation $R^{tr}$ is given in terms of the trace of the Dirichlet form $\mathcal E$ to finite subnetworks. A probabilistic approach shows that in the limit, $R^{tr}$ coincides with $R^F$. This suggests a comparison between the probabilistic interpretations of $R^F$ vs. $R^W$.
description: 31 pages, 4 figures
Effect of Reinforment of Particles on the Mechanical Properties of Al6065-SiC, Al6065- Al2O3, Hybrid Composites by Modified Stir Casting Method
Creators: name: N, Ashok.
name: Mulu, Tikilt
Publisher: name: Abyssinia Journal of Engineering and Computing
Year: 2021

description: Aluminum and its alloys are the most essential considerations as base metal in metal matrix composites. The aluminum alloys are reasonably attracted by various researchers owing to their decrease in weight, high quality corrosion resistance, maximum thermal and electrical conductivity, and on precipitation, they exhibit higher strength and superior damping capacity. The strong requirement for weight reduction in automobile and aerospace industries insists on the optimization of the design of products to make use of less weight materials. MMCs production has numerous challenges like porosity formation, attainment of good wettability and inappropriate distribution of reinforcement. Homogenous distribution of reinforcement in the metal matrix composites is the most important challenge among the other parameters and obtained by twostep stir casting method. In this present research work Al6065 & Hybrid composites with four different reinforcement particles such as SiC, alumina, SiC-fly ash, alumina-fly ash in three different weight fractions (2, 4, and 6 %) were fabricated by modified stir casting method. The mechanical properties of the Al6065 & hybrid composites and unreinforced alloy have been investigated. The enhancement in the mechanical properties of Al6065 composites due to the reinforcement of particles is obtained.
description: Abyssinia Journal of Engineering and Computing, Vol. 1 No. 1 (2021)
title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° ÑÐ¸ÑÑÐµÐ¼Ñ ÐºÐ»ÑÑÐµÐ²ÑÑ Ð¿Ð¾ÐºÐ°Ð·Ð°ÑÐµÐ»ÐµÐ¹ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ Ð´Ð»Ñ Ð¼Ð°Ð»ÑÑ Ð¸Ð½Ð½Ð¾Ð²Ð°ÑÐ¸Ð¾Ð½Ð½ÑÑ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¹ Ð¡ÐÐ±ÐÐ£
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
Creators: name: Ð£ÑÑÑÑÐ½ÑÐµÐ²Ð°, ÐÐºÑÐ°Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: Ð¼Ð°Ð»ÑÐµ Ð¸Ð½Ð½Ð¾Ð²Ð°ÑÐ¸Ð¾Ð½Ð½ÑÐµ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ
Ð±ÑÑ Ð³Ð°Ð»ÑÐµÑÑÐºÐ°Ñ Ð¾ÑÑÐµÑÐ½Ð¾ÑÑÑ
KPI
ÑÑÑÐ°ÑÐµÐ³Ð¸ÑÐµÑÐºÐ¾Ðµ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ðµ

description: ÐÐ±ÑÐµÐºÑÐ¾Ð¼ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ ÑÐ²Ð»ÑÐµÑÑÑ Ð¢ÐµÑÐ½Ð¾ÐÐ°ÑÐº Â«ÐÐ¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹Â». Ð¦ÐµÐ»ÑÑ Ð²ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ ÑÐ²Ð»ÑÐµÑÑÑ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° ÑÐ¸ÑÑÐµÐ¼Ñ ÐºÐ»ÑÑÐµÐ²ÑÑ Ð¿Ð¾ÐºÐ°Ð·Ð°ÑÐµÐ»ÐµÐ¹ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ Ð´Ð»Ñ Ð¼Ð°Ð»ÑÑ Ð¸Ð½Ð½Ð¾Ð²Ð°ÑÐ¸Ð¾Ð½Ð½ÑÑ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¹. ÐÐ° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð±ÑÑÐ³Ð°Ð»ÑÐµÑÑÐºÐ¾Ð¹ Ð¾ÑÑÐµÑÐ½Ð¾ÑÑÐ¸ Ð±ÑÐ» Ð¿ÑÐ¾Ð¸Ð·Ð²ÐµÐ´ÐµÐ½ Ð°Ð½Ð°Ð»Ð¸Ð· ÑÐµÑÐ½Ð¸ÐºÐ¾-ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ñ Ð¿Ð¾ÐºÐ°Ð·Ð°ÑÐµÐ»ÐµÐ¹ ÐÐÐ ÐÐ¦ÐÐ Â«ÐÐ¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹Â».
Development and Analysis of the Thermal Behaviour of Non-Woven Fabric made with Cotton and Acrylic Blend
Creators: name: Nachiappan, Sukumar
name: Hussien, Mohammed
Publisher: name: Abyssinia Journal of Engineering and Computing
Year: 2021

description: Thermal insulators are composed of fibres that have greater resistance towards heat, light radiation, chemicalresistance, and other related properties in their specified area of application. Major applications of thermal insulators in the form of non-woven fabrics are apparel, interlinings, blanket and sleeping rugs, automobiles, shoe covers,carpets, building insulators, and industrial packing equipment. In this research work, we have developed an engineered non-woven thermal insulator fabric from Cotton/Acrylic blend by stitch bonding process by the laying offibres during web preparation. Here, we selected fibres cotton and acrylic for the production of non-woven thermalinsulation because of their comparatively lower cost, availability, better thermal stability, for its attractive physical and mechanical properties. Different blending ratios, GSM and stitch density were taken into consideration as the main factors focused during sample preparation. Then, the non-woven fabrics were taken for laboratory testing of itsGSM, stitch density, thickness, air permeability, and thermal conductivity tests. The thermal conductivity tests werecarried out using static or gravitational method with WL 372 radial and linear heat conduction instruments. As perthe test results, the thermal conductivity of the developed fabrics shows increment with the reduction of fabricweight, stitch density, air permeability and cotton fibre content in the blending composition.
description: Abyssinia Journal of Engineering and Computing, Vol. 1 No. 1 (2021)
Rocking ratchet induced by pure magnetic potentials with broken reflection symmetry
Creators: name: de Lara, D. Perez
name: Castano, F. J.
name: Ng, B. G.
name: Korner, H. S.
name: Dumas, R. K.
name: Gonzalez, E. M.
name: Liu, Kai
name: Ross, C. A.
name: Schuller, Ivan K.
name: Vicent, J. L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A ratchet effect (the rectification of an ac injected current) which is purely magnetic in origin has been observed in a superconducting-magnetic nanostructure hybrid. The hybrid consists of a superconducting Nb film in contact with an array of nanoscale magnetic triangles, circular rings or elliptical rings. The arrays were placed into well-defined remanent magnetic states by application of different magnetic field cycles. The stray fields from these remanent states provide a magnetic landscape which influences the motion of superconducting vortices. We examined both randomly varying landscapes from demagnetized samples, and ordered landscapes from samples at remanence after saturation in which the magnetic rings form parallel onion states containing two domain walls. The ratchet effect is absent if the rings are in the demagnetized state or if the vortices propagate parallel to the magnetic reflection symmetry axis (perpendicular to the magnetic domain walls) in the ordered onion state. On the other hand, when the vortices move perpendicular to the magnetic reflection symmetry axis in the ordered onion state (parallel to the domain walls) a clear ratchet effect is observed. This behavior differs qualitatively from that observed in samples containing arrays of triangular Ni nanostructures, which show a ratchet of structural origin.
description: 16 pages, 6 figures and 1 table
title: Consumer research with application of statistical methods on the purposes of positioning and promotion
title: Ð¼Ð°Ð³Ð¸ÑÑÐµÑÑÐºÐ°Ñ Ð´Ð¸ÑÑÐµÑÑÐ°ÑÐ¸Ñ
titleType: Subtitle
title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð¿Ð¾ÑÑÐµÐ±Ð¸ÑÐµÐ»ÐµÐ¹ Ñ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸ÐµÐ¼ ÑÑÐ°ÑÐ¸ÑÑÐ¸ÑÐµÑÐºÐ¸Ñ Ð¼ÐµÑÐ¾Ð´Ð¾Ð² Ð´Ð»Ñ ÑÐµÐ»ÐµÐ¹ Ð¿Ð¾Ð·Ð¸ÑÐ¸Ð¾Ð½Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¸ Ð¿ÑÐ¾Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ
Creators: name: Tibina, Elena
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2016
Subjects: Ð¿Ð¾Ð²ÐµÐ´ÐµÐ½Ð¸Ðµ Ð¿Ð¾ÑÑÐµÐ±Ð¸ÑÐµÐ»ÐµÐ¹
ÑÐµÐºÐ»Ð°Ð¼Ð°
Ð¸Ð¼Ð¸Ð´Ð¶ÐµÐ²Ð°Ñ ÑÐµÐºÐ»Ð°Ð¼Ð°
ÑÐ°ÐºÑÐ¾ÑÐ½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð·
ÐºÐ»Ð°ÑÑÐµÑÐ½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð·
Ð¼Ð½Ð¾Ð³Ð¾Ð¼ÐµÑÐ½Ð¾Ðµ ÑÐºÐ°Ð»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ
consumer behavior
advertising
image advertising
factor analysis
cluster analysis
multidimensional scaling

description: Ð Ð¼Ð°Ð³Ð¸ÑÑÐµÑÑÐºÐ¾Ð¹ Ð´Ð¸ÑÑÐµÑÑÐ°ÑÐ¸Ð¸ Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ñ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÑ Ð°Ð½Ð°Ð»Ð¸Ð·Ð° Ð¸ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ Ð¼ÐµÑÐ¾Ð´Ð¾Ð² ÑÑÐ°ÑÐ¸ÑÑÐ¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð°Ð½Ð°Ð»Ð¸Ð·Ð° Ñ ÑÐµÐ»ÑÑ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ¸ ÐºÐ¾Ð½ÑÐµÐ¿ÑÐ¸Ð¹ Ð¿Ð¾Ð·Ð¸ÑÐ¸Ð¾Ð½Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ. Ð ÑÐ°ÑÑÐ½Ð¾ÑÑÐ¸, ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ Ð¸ Ð¿ÑÐ¾ÑÐµÑÑÐ¸ÑÐ¾Ð²Ð°Ð½Ñ Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ ÐºÐ¾Ð¼Ð¿Ð°Ð½Ð¸Ð¹ ÑÑÐ½ÐºÐ° Ð½ÐµÐ´Ð²Ð¸Ð¶Ð¸Ð¼Ð¾ÑÑÐ¸ Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³Ð° Q-Ð¼ÐµÑÐ¾Ð´ Ð¸ Ð¼Ð½Ð¾Ð³Ð¾Ð¼ÐµÑÐ½Ð¾Ðµ ÑÐºÐ°Ð»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ.
description: Master thesis is aimed to present the results of investigation and application of statistical analysis methods to use them in positioning concepts development. In particular, Q-method and MDS analysis were examined and tested. The research is made on the basis of the companies on Saint-Petersburg real-estate market.
Development of NIR/VIS 3D optical imaging systems for ocular tissue imaging
Creators: name: Hu, Yujie
Publisher: name: University of British Columbia
Year: 2024

description: Research and surgery in ophthalmology demand precise details about ocular tissues to study the causes of diseases, examine possible therapies, and assess the suitability of donated tissues. Mouse were commonly studied in preclinical research, which offers significant benefits as research subjects due to their ready availability and the wide array of pathological models they represent. Meanwhile, human corneal transplants require a comprehensive examination of the donor cornea to guarantee the success of the transplant. Optical coherence tomography (OCT) is a noninvasive imaging method that captures high-resolution three-dimensional structures. It has been extensively used in ophthalmology for several years and has progressed to provide details such as cellular structures, melanin distribution, and vascular distribution for ocular tissues. The thesis explores two micro-optical coherence tomography systems in NIR and VIS. Utilizing these two systems, the study examined the mouse model and human and obtained cellular-resolution images of the posterior segment of the eye. These images offer crucial insights for understanding eye diseases and assessing potential treatment approaches. Additionally, high-resolution images of mouse and human corneas were captured to assess the integration of corneal layers and to help increase the effectiveness of corneal transplant procedures.
Mechanisms for higher $T_C$ in copper oxide superconductors; Ideas from band calculations
Creators: name: Jarlborg, T.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Band calculations for the hole doped La$_2$CuO$_4$ system show that artificial periodicities of Ba dopants can give the material different properties than from a uniform distribution of dopants. A periodicity within the planes make static pseudogaps which could be tuned to raise the density-of-states (DOS) at $E_F$ and the superconducting $T_C$. A periodic doping dependence perpendicular to the CuO planes can increase the matrix element for spin fluctuations.
description: 1 Figure
Characterization of Petroleum Oil Seepage Using Modern Spectroscopic Techniques: In Case of Were Ilu-Legeheda, Ethiopia
Creators: name: Awoke, Sisay
name: Gezahegn, Dessalegn
Publisher: name: Abyssinia Journal of Engineering and Computing
Year: 2021

description: The sedimentary regions of Ethiopia cover a significant portion of the country and comprise five distinct sedimentary basins; namely, Ogaden, Abay, Mekele, Gambela and Southern Rift Basins. The Blue Nile basin is a North West-South East trending branch of the Ogaden intra continental rift basin. The presence of an oil seepage at Were Ilu and Legeheda points to the presence of an active petroleum system. The main aim of this study was to characterize the chemical nature of the seepage oil leaked out from the hard basalt rock of Mechela river. Seepage oil samples were analyzed using ultraviolet (UV), infrared (IR), and nuclear magnetic resonance (NMR) spectroscopic methods. All the chemical analysis obtained from UV, IR and NMR showed that high contents of saturated hydrocarbons were found in the petroleum collected from the stated areas, which is the principal criterion for identification of pure petroleum oil.
description: Abyssinia Journal of Engineering and Computing, Vol. 1 No. 1 (2021)
Abundant Circumstellar Silica Dust and SiO Gas Created by a Giant Hypervelocity Collision in the ~12 Myr HD172555 System
Creators: name: Lisse, C. M.
name: Chen, C. H.
name: Wyatt, M. C.
name: Morlok, A.
name: Song, I.
name: Bryden, G.
name: Sheehan, P.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The fine dust detected by IR emission around the nearby Beta Pic analogue star HD172555 is very peculiar. The dust mineralogy is composed primarily of highly refractory, non-equilibrium materials, with approximately three-quarters of the Si atoms in silica (SiO2) species. Tektite and obsidian lab thermal emission spectra (non-equilibrium glassy silicas found in impact and magmatic systems) are required to fit the data. The best-fit model size distribution for the observed fine dust is dn/da = a-3.95 +/- 0.10. This steep a size distribution, with abundant micron-sized particles, argues for a fresh source of material within the last 0.1 Myr. The location of the dust with respect to the star is at 5.8 +/- 0.6 AU (equivalent to 1.9 +/- 0.2 AU from the Sun), within the terrestrial planet formation region but at the outer edge of any possible terrestrial habitability zone. The mass of fine dust is 4 x 10^19 - 2 x 10^20 kg, equivalent to a 150 - 200 km radius asteroid. Significant emission features centered at 4 and 8 um due to fluorescing SiO gas are also found. Roughly 10^22 kg of SiO gas, formed by vaporizing silicate rock, is also present in the system, and a separate population of very large, cool grains, massing 10^21 - 10^22 kg and equivalent to the largest sized asteroid currently found in the Solar System's main asteroid belt, dominates the solid circumstellar material by mass. The makeup of the observed dust and gas, and the noted lack of a dense circumstellar gas disk, strong primary x-ray activity, or an extended disk of Beta-meteroids argues that the source of the observed circumstellar materials is a giant hypervelocity (> 10 km sec^-1) impact between large rocky planetesimals, similar to the ones which formed the Moon and which stripped the surface crustal material off of Mercury's surface.
description: 48 Pages, 8 Figures, 4 Tables Accepted for Publication in the Astrophysical Journal 13-Jun-2009 References, Figures Updated 16-Jun-2009
title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¿ÑÐ¾ÐµÐºÑÐ° ÑÐ¾Ð·Ð´Ð°Ð½Ð¸Ðµ Ð½Ð¾Ð²ÑÑ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°ÑÐµÐ»ÑÐ½ÑÑ ÐºÑÑÑÐ¾Ð² Ð½Ð° Ð±Ð°Ð·Ðµ Ð¦ÐµÐ½ÑÑÐ° Ð½ÐµÐ¿ÑÐµÑÑÐ²Ð½Ð¾Ð³Ð¾ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°Ð½Ð¸Ñ Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¾Ð³Ð¾ Ð³Ð¾ÑÑÐ´Ð°ÑÑÑÐ²ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð±ÑÐ´Ð¶ÐµÑÐ½Ð¾Ð³Ð¾ Ð¿ÑÐ¾ÑÐµÑÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ð³Ð¾ ÑÑÑÐµÐ¶Ð´ÐµÐ½Ð¸Ñ Â«Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ ÑÐµÑ Ð½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÐºÐ¾Ð»Ð»ÐµÐ´Ð¶ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¸ ÐºÐ¾Ð¼Ð¼ÐµÑÑÐ¸Ð¸Â»
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
Creators: name: ÐÐµÐ²ÑÐµÐ½ÐºÐ¾, Ð¢Ð°ÑÑÑÐ½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°ÑÐµÐ»ÑÐ½ÑÐµ ÐºÑÑÑÑ
Ð¸Ð½Ð²ÐµÑÑÐ¸ÑÐ¸Ð¾Ð½Ð½ÑÐµ Ð¿ÑÐ¾ÐµÐºÑÑ
ÑÐ¸Ð½Ð°Ð½ÑÐ¾Ð²ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð·
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description: Ð¦ÐµÐ»ÑÑ Ð²ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ ÑÐ²Ð»ÑÐµÑÑÑ Ð¸Ð·ÑÑÐµÐ½Ð¸Ðµ Ð°ÑÐ¿ÐµÐºÑÐ¾Ð² Ð¸Ð½Ð²ÐµÑÑÐ¸ÑÐ¸Ð¾Ð½Ð½Ð¾Ð³Ð¾ Ð¿ÑÐ¾ÐµÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ, ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° ÑÑÐµÑ Ð²Ð°ÑÐ¸Ð°Ð½ÑÐ¾Ð² Ð¿ÑÐ¾ÐµÐºÑÐ° Ð¿Ð¾ ÑÐ¾Ð·Ð´Ð°Ð½Ð¸Ñ Ð½Ð¾Ð²ÑÑ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°ÑÐµÐ»ÑÐ½ÑÑ ÐºÑÑÑÐ¾Ð² Ð½Ð° Ð±Ð°Ð·Ðµ ÑÐµÐ½ÑÑÐ° Ð½ÐµÐ¿ÑÐµÑÑÐ²Ð½Ð¾Ð³Ð¾ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°Ð½Ð¸Ñ Ð¡ÐÐ± ÐÐÐÐÐ£ Â«Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÐºÐ¾Ð»Ð»ÐµÐ´Ð¶ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¸ ÐºÐ¾Ð¼Ð¼ÐµÑÑÐ¸Ð¸Â», Ð²ÑÑÐ²Ð»ÐµÐ½Ð¸Ðµ Ð±Ð¾Ð»ÐµÐµ Ð²ÑÐ³Ð¾Ð´Ð½ÑÑ Ð³ÑÑÐ¿Ð¿ ÐºÑÑÑÐ¾Ð² Ð´Ð»Ñ ÑÐ¾Ð·Ð´Ð°Ð½Ð¸Ñ Ð½Ð° Ð±Ð°Ð·Ðµ ÑÐµÐ½ÑÑÐ°.
title: Impact of Land-Applied Biosolids on Forage Quality And Water Movement During Rangeland Restoration Activities
Creators: name: Vasquez, Issaak R
Publisher: name: Utah State University
Year: 2008

description: The land application of biosolids to provide nutrients and organic matter is widely practiced in agricultural applications. However, the potential benefit of applying biosolids to disturbed rangelands has not been adequately evaluated. Thus the main goal of the current study was to evaluate the potential economic and environmental benefits of applying biosolids to disturbed rangeland with the main focus on evaluating the impact on forage quality and quantity as a function of biosolids type and application rate. Three types of biosolids (aerobically, anaerobically, and lime stabilized biosolids) were surface applied with no subsequent tilling at various loading rates (1, 5, 10, and 20 times nitrogen plant requirement) in Skull Valley, Utah. It was demonstrated that forage quality (crude protein and in vitro digestibility) and quantity (biomass) can be improved by biosolids land application. Also, the analyses of the soil and forage for 16 specific metals indicated no measurable accumulation except for a statistical increase of sodium compared with the control. No negative impact on soil moisture infiltration (e.g., drainage) properties were seen. The economic analysis of biosolids land application on disturbed rangeland associated with improvements in forage quality indicated that use of biosolids for land restoration would be profitable. The highest potential financial return was observed when anaerobically digested biosolids were land applied at 20 times the agronomic rate. Finally, despite the numerous benefits associated with biosolids land application, there remain a number of human health and environmental concerns regarding its use on publicly accessible lands that should be addressed in future studies. These concerns are primarily associated with the accumulation of heavy metals and recalcitrant organics (e.g. polychlorinated biphenyls, dioxins, brominated biphenyls, and pharmaceuticals and personal care products) that may be associated with the biosolids.
Theoretical investigation of polarization-compensated II-IV/I-V perovskite superlattices
Creators: name: Murray, Éamonn D.
name: Vanderbilt, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recent work suggested that head-to-head and tail-to-tail domain walls could be induced to form in ferroelectric superlattices by introducing compensating "delta doping" layers via chemical substitution in specified atomic planes [Phys. Rev. B 73, 020103(R), 2006]. Here we investigate a variation of this approach in which superlattices are formed of alternately stacked groups of II-IV and I-V perovskite layers, and the "polar discontinuity" at the II-IV/I-V interface effectively provides the delta-doping layer. Using first-principles calculations on SrTiO3/KNbO3 as a model system, we show that this strategy allows for the growth of a superlattice with stable polarized regions and large polarization discontinuities at the internal interfaces. We also generalize a Wannier-based definition of layer polarizations in perovskite superlattices [Phys. Rev. Lett. 97, 107602 (2006)] to the case in which some (e.g., KO or NbO2) layers are non-neutral, and apply this method to quantify the local variations in polarization in the proposed SrTiO3/KNbO3 superlattice system.
description: 4 pages, 4 figures