Search results for "hands"
showing 10 items of 87 documents
Revisit of RTS/CTS Exchange in High-Speed IEEE 802.11 Networks
2005
IEEE 802.11 medium access control (MAC), called distributed coordination function (DCF), provides two different access modes, namely, 2-way (basic access) and 4-way (RTS/CTS) handshaking. The 4-way handshaking has been introduced in order to combat the hidden terminal phenomenon. It has been also proved that such a mechanism can be beneficial even in the absence of hidden terminals, because of the collision time reduction. We analyze the effectiveness of the RTS/CTS access mode, in current 802.11b and 802.11a networks. Since the rates employed for control frame transmissions can be much lower than the rate employed for data frames, the assumption on the basis of the 4-way handshaking introd…
Besprechung: Ps.-Manethonis Apotelesmatica, kritische Ausgabe von C. De Stefani, Wiesbaden 2017
2018
Inest iudicium de nova ps.-Manethonis editio a Claudio De Stefani nuper parata. Quaedam nova de manuscriptis proposui necnon multas emendationes.
Teaching Inorganic Photophysics and Photochemistry with Three Ruthenium(II) Polypyridyl Complexes: A Computer-Based Exercise
2015
Among computational methods, DFT (density functional theory) and TD-DFT (time-dependent DFT) are widely used in research to describe, inter alia, the optical properties of transition metal complexes. Inorganic/physical chemistry courses for undergraduate students treat such methods, but quite often only from the theoretical point of view. In the calculation exercise herein described, students are guided step by step through the computational study of the photophysics and photochemistry of polypyridyl Ru(II) d6-metal complexes. In particular, by means of DFT and TD-DFT calculations, they are asked to examine and interpret a set of experimental data describing the absorption, emission, and ph…
Hands-on tasks in CLIL science classrooms as sites for subject-specific language use and learning
2015
This paper is concerned with content and language integrated learning (CLIL), i.e. classrooms where a foreign or second language (L2) is used as the means of instruction and where content and language learning objectives merge. More specifically, it explores the potential of hands-on tasks in CLIL chemistry and physics lessons to serve as sites for using and learning subject-specific language, conceptualised as both special concepts and terminology as well as subject-specific ways of constructing meaning. Using discourse analysis, attention was directed to hands-on tasks as well as pre-task and post-task phases. The findings indicate that despite the evident content orientation in the tasks…
Jurista Dītriha Andreja Lēbera personālais fonds Latvijas Akadēmiskajā bibliotēkā
2004
Global trends of hand and wrist trauma: A systematic analysis of fracture and digit amputation using the Global Burden of Disease 2017 Study
2020
BackgroundAs global rates of mortality decrease, rates of non-fatal injury have increased, particularly in low Socio-demographic Index (SDI) nations. We hypothesised this global pattern of non-fatal injury would be demonstrated in regard to bony hand and wrist trauma over the 27-year study period.MethodsThe Global Burden of Diseases, Injuries, and Risk Factors Study 2017 was used to estimate prevalence, age-standardised incidence and years lived with disability for hand trauma in 195 countries from 1990 to 2017. Individual injuries included hand and wrist fractures, thumb amputations and non-thumb digit amputations.ResultsThe global incidence of hand trauma has only modestly decreased since…
Building large molecular models with plastic screw-on bottle caps and sturdy connectors
2016
An improved method of connecting atoms formed with screw-on bottle caps is described. Fishing line (artificial polymer), steel wire, and countersunk bolts with nyloc nuts are proposed as sturdy connectors. Advantages and disadvantages of each method are described. The molecular models are stable while handling, can be built in a relatively short time at low cost, and can be useful at every level of education. The method is an alternative to professional model kits, in particular in construction of large models for long-term usage.
Blisters and calluses from rowing : prevalence, perceptions and pain tolerance
2022
Background and Objectives: Rowing is a sport that involves constant gripping, pulling/pushing, and rotational movements of the hands, in a cyclic periodic manner with every stroke, with hundreds of strokes being taken within a short period of time. Dermatological issues on rowers’ hands (fingers and palms) in the form of blisters and calluses are common knowledge within the community, but their prevalence and the rower’s perceptions and pain tolerance to them has never been systematically evaluated. This work addresses these lacunae. Materials and Methods: Analysis of data collected from a survey on a sample of competitive (117) and noncompetitive rowers (28) who row on-water (total 145). R…
Placing links in mobile banking application
2005
This study compares two alternative ways to organize links as navigation elements in mobile banking applications. For the comparison, two alternative banking applications were tested. The applications that were tested had the same content but different ways to navigate with links. One of them provided a system where the user was required to use specific menu pages for navigation and where there were no cross-navigation enabling links on content pages. The other application had cross-navigation enabling links on content pages. The comparison was done by conducting a usability test with 30 test users. The users' performance and subjective feedback were measured in the test. The application wi…
Dirty Hands? No (Moral) Problem!
2018
In his famous 1973 paper, Michael Walzer introduced “The Problem of Dirty Hands” to political philosophy. A decision-maker, according to Walzer, is “trapped” in a dirty hands-situation if his decision and ensuing actions “may be exactly the right thing to do […] and yet leave the man guilty of a moral wrong. The innocent man, afterwards, is no longer innocent” (Walzer 1973: 160).