Phonon emission and absorption in the fractional quantum Hall effect

We investigate the time dependent thermal relaxation of a two-dimensional electron system in the fractional quantum Hall regime where ballistic phonons are used to heat up the system to a non-equilibrium temperature. The thermal relaxation of a 2DES at $\nu=1/2$ can be described in terms of a broad band emission of phonons, with a temperature dependence proportional to $T^4$. In contrast, the relaxation at fractional filling $\nu=2/3$ is characterized by phonon emission around a single energy, the magneto-roton gap. This leads to a strongly reduced energy relaxation rate compared to $\nu=1/2$ with only a weak temperature dependence for temperatures 150 mK $< T <$ 400 mK.Comment: 4 pages, 3 figures; 14th International Conference on High Magnetic Fields in Semiconductor Physics, September 24-29, 2000, Matsue, Japa

In This Issue [of \u3ci\u3eTESOL Quarterly\u3c/i\u3e, on Language Teacher Identity]

Our decision to propose a special issue of TESOL Quarterly on language teacher identity (LTI) grew out of our growing recognition of the profound embeddedness of LTI within the research, teaching, and policy practices of (multi)lingual professionals and the immense interest generated by LTI work within the disciplines that engage with language education. We use (multi) in (multi)lingual to underscore our desire to move beyond a monolingual lens in TESOL and to highlight potential extensions to the notion of multilingualism, such as (pluri), (trans), (ethno), and (racio). This allows us to complicate the ever-changing, situated, and fluid nature of LTI beyond the essentialist categories often associated with the profession. These extensions, in particular, acknowledge language teachers (LTs) as denizens and creators of conversational borderlands (Anzaldúa, 1987). As such, each of us came to our individual understandings of this embeddedness in our personal and professional lives by different paths, as illustrated by the following narratives from each co-editor. ... Exploring our language teacher identities means understanding our lived and living history. It is to understand and unravel the complexities that are at the core of who we are on all levels—for instance, as multilinguals, scholars, children, teachers, parents, community members, language users, and activists and their intersectionality, all of which shape our classroom practices and pedagogy, which in turn fuel and circle back to shape our language teacher identities. After taking initial steps toward this end, this special issue and the articles herein are intended as an invitation for our readers to join us as we take further steps forth

Tuning the insertion properties of pHLIP

The pH (low) insertion peptide (pHLIP) has exceptional characteristics: at neutral pH it is an unstructured monomer in solution or when bound to lipid bilayer surfaces, and it inserts across a lipid bilayer as a monomeric alpha-helix at acidic pH. The peptide targets acidic tissues in vivo and may be useful in cancer biology for delivery of imaging or therapeutic molecules to acidic tumors. To find ways to vary its useful properties, we have designed and analyzed pHLIP sequence variants. We find that each of the Asp residues in the transmembrane segment is critical for solubility and pH-dependent membrane insertion of the peptide. Changing both of the Asp residues in the transmembrane segment to Glu, inserting an additional Asp into the transmembrane segment, or replacing either of the Asp residues with Ala leads to aggregation and/or loss of pH-dependent membrane insertion of the peptide. However, variants with either of the Asp residues changed to Glu remained soluble in an aqueous environment and inserted into the membrane at acidic pH with a higher pKapp of membrane insertion

Фармакоінформатика: новітні іт-технології в освітньому процесі, науковій та практичній фармації

It has been established that the developed information systems and databases make it possible to create a single information space that will unite drug manufacturers, intermediaries, pharmacies and consumers, government structures, pharmaceutical enterprises and pharmaceutical companies. Such a unified information space will create an opportunity to conduct various researches in real time. It has been proven that the study of the course "Pharmacoinformatics" in higher education institutions of Ukraine for students of specialty 226 "Pharmacy, industrial pharmacy" of two specializations 226.01 "Pharmacy" and 226.02 "Industrial pharmacy" is a fundamental process on the way to the realization of future specialists in the pharmaceutical industry.Встановлено, що розроблені інформаційні системи та бази даних дозволяють створити єдиний інформаційний простір, який об'єднає виробників ліків, посередників, аптеки та споживачів, державні структури, фармацевтичні підприємства та фармацевтичні компанії. Такий єдиний інформаційний простір створить можливість проводити різноманітні дослідження в режимі реального часу. Доведено, що вивчення курсу «Фармакоінформатики» в закладах вищої освіти України для студентів спеціальності 226 «Фармація, промислова фармація» двох спеціалізацій 226.01 «Фармація» та 226.02 «Промислова фармація» є фундаментальним процесом на шляху до реалізації майбутніх спеціалістів фармацевтичної галузі

Investigation of sandwich material surface created by abrasive water jet (AWJ) via vibration emission

The paper presents research a of abrasive waterjet cutting of heterogeneous “sandwich“ material with different Young modulus of elasticity of the cutted surface geometry by means of vibration emission. In order to confirm hypothetical assumptions about direct relation between vibration emission and surface quality an experiment in heterogeneous material consisting of stainless steel (DIN 1.4006 / AISI 410) and alloy AlCuMg2 has been provided

Condition Monitoring of Kaplan Turbine Bearings Using Vibro-diagnostics

Vibration diagnostics is an indispensable method to evaluate the technical condition of machinery. If the conditions of machines are regularly monitored, the problems can be corrected even before they arise. The most often overloaded components of the turbine are bearings that similarly like other machinery are subject to degradation wear. The article deals with the bearings´ condition of the Kaplan turbine. Within the research, the frequencies at which maximum accelerations were achieved and their impact on plant operation were observed. Time records were converted to the frequency domain by means of Fast Fourier Transformation and the records were processed by means of filters. Acceleration peaks have determined the frequencies responsible for the outer and inner ring damages, but based on an evaluation of the operating state of the bearing using Root Mean Square (RMS) values could be concluded that that damage to any part of the bearing is not demonstrable and the turbine is operability

In This Issue [of \u3ci\u3eTESOL Quarterly\u3c/i\u3e, on Language Teacher Identity]

Our decision to propose a special issue of TESOL Quarterly on language teacher identity (LTI) grew out of our growing recognition of the profound embeddedness of LTI within the research, teaching, and policy practices of (multi)lingual professionals and the immense interest generated by LTI work within the disciplines that engage with language education. We use (multi) in (multi)lingual to underscore our desire to move beyond a monolingual lens in TESOL and to highlight potential extensions to the notion of multilingualism, such as (pluri), (trans), (ethno), and (racio). This allows us to complicate the ever-changing, situated, and fluid nature of LTI beyond the essentialist categories often associated with the profession. These extensions, in particular, acknowledge language teachers (LTs) as denizens and creators of conversational borderlands (Anzaldúa, 1987). As such, each of us came to our individual understandings of this embeddedness in our personal and professional lives by different paths, as illustrated by the following narratives from each co-editor. ... Exploring our language teacher identities means understanding our lived and living history. It is to understand and unravel the complexities that are at the core of who we are on all levels—for instance, as multilinguals, scholars, children, teachers, parents, community members, language users, and activists and their intersectionality, all of which shape our classroom practices and pedagogy, which in turn fuel and circle back to shape our language teacher identities. After taking initial steps toward this end, this special issue and the articles herein are intended as an invitation for our readers to join us as we take further steps forth

Real-time on-board obstacle avoidance for UAVs based on embedded stereo vision

In order to improve usability and safety, modern unmanned aerial vehicles (UAVs) are equipped with sensors to monitor the environment, such as laser-scanners and cameras. One important aspect in this monitoring process is to detect obstacles in the flight path in order to avoid collisions. Since a large number of consumer UAVs suffer from tight weight and power constraints, our work focuses on obstacle avoidance based on a lightweight stereo camera setup. We use disparity maps, which are computed from the camera images, to locate obstacles and to automatically steer the UAV around them. For disparity map computation we optimize the well-known semi-global matching (SGM) approach for the deployment on an embedded FPGA. The disparity maps are then converted into simpler representations, the so called U-/V-Maps, which are used for obstacle detection. Obstacle avoidance is based on a reactive approach which finds the shortest path around the obstacles as soon as they have a critical distance to the UAV. One of the fundamental goals of our work was the reduction of development costs by closing the gap between application development and hardware optimization. Hence, we aimed at using high-level synthesis (HLS) for porting our algorithms, which are written in C/C++, to the embedded FPGA. We evaluated our implementation of the disparity estimation on the KITTI Stereo 2015 benchmark. The integrity of the overall realtime reactive obstacle avoidance algorithm has been evaluated by using Hardware-in-the-Loop testing in conjunction with two flight simulators

Protocol for culturing and imaging of ectodermal cells from Xenopus

The Xenopus embryo provides an advantageous model system where genes can be readily transplanted as DNA or mRNA or depleted with antisense techniques. Here, we present a protocol to culture and image the cell biological properties of explanted Xenopus cap cells in tissue culture. We illustrate how this protocol can be applied to visualize lysosomes, macropinocytosis, focal adhesions, Wnt signaling, and cell migration. For complete details on the use and execution of this protocol, please refer to Tejeda-Muñoz et&nbsp;al. (2022)