Triboelectric motion sensors, based on the generation of a voltage across two dissimilar materials sliding across each other as a result of the triboelectric effect, have generated interest due to the relative simplicity of the typical grated device structures and materials required. However, these sensors are often limited by poor spatial and/or temporal resolution of motion due to limitations in achieving the required device feature sizes through conventional lithography or printing techniques. Furthermore, the reliance on metallic components that are relatively straightforward to pattern into fine features limits the possibility to develop transparent sensors. Polymers would allow for transparent devices, but these materials are significantly more difficult to pattern into fine features when compared to metals. Here, an aerosol‐jet printing (AJP) technique is used to develop triboelectric sensors using a wide variety of materials, including polymers, which can be directly printed into finely featured grated structures for enhanced sensitivity to displacement and speed of motion. A detailed investigation is presented highlighting the role of material selection and feature size in determining the overall resolution of the resulting motion sensor. A three‐channel rotary sensor is also presented, demonstrating the versatility of the AJP technique in developing more complex triboelectric motion sensors.

A number of energetic ionic liquids (EILs) have been reported as promising hydrazine-replacement fuels for hypergolic rocket propulsion. However, most of these EILs were ignited using corrosive and hazardous concentrated fuming nitric acid. Very significant efforts were recently made to utilize “rocket grade” highly concentrated H2O2 (>90%) as a “green” alternative to fuming nitric acid and N2O4 oxidizers. Although “rocket grade” H2O2 is more challenging to use and less safe for storage than commercially available H2O2 (70%), the latter is not considered as a viable oxidizer for hypergolic propulsion. In this work, we focused on the development of novel iodine-rich promoters, capable of initiating hypergolic ignition reactions between a typical EIL fuel – 3-ethyl-1-methyl-1H-imidazol-3-ium cyanotrihydroborate – and H2O2. Among the prepared and evaluated promoters, the top performing [FcCH2NEtMe2+]2[B12I122−] compound 5 showed ignition delay times of 45 ms in the reaction of the tested EIL with H2O2 (70%) and 17 ms with H2O2 (95%). We believe that these findings provide a platform for the development and utilization of commercially available H2O2 as a potential “green” oxidizer for rocket propulsion.

This study estimates municipal efficiency and economies of scale of municipalities in Bosnia and Herzegovina by employing data envelopment analysis (DEA) with variable (VRS) and constant (CRS) returns to scale. The results indicate low overall municipal efficiency, with economies of scale reached in very few municipalities. The average municipal efficiency score is 0.7115 under DEA VRS assumption, where only 16% of municipalities are found efficient. The average scale efficiency is 0.7458 with full scale efficiency reached by only 11% of municipalities in Bosnia and Herzegovina. Furthermore, the analysis shows strong positive impact of number of inhabitants on overall municipal efficiency. Politically motivated fragmentation of municipalities, aiming to bring peace and stability to the country, did not go hand in hand with improved economic efficiency.

In his research, the author investigates the extent/ratio of abstraction or visualization in affecting the formation of musical thought, which may lead to the question as to what extent the theoretical knowledge helps the performing practice, and vice versa: does the perception of the selected instrument, and if so - to what extent, can help to more confident knowledge of elementary theory of music? The research is based on the author’s personal experience in the years-long teaching practice.

Autor u istraživanju propituje u kojoj mjeri/omjeru apstrakcija ili vizualizacija utječu na formiranje muzičkog mišljenja što može voditi do pitanja u kojoj mjeri teorijsko znanje pomaže u izvođačkoj praksi, ali i obratno: da li i u kojoj mjeri percepcija odabranog instrumenta može pomoći u sigurnijem znanju elementarne teorije muzike? Istraživanje je bazirano na osobnom iskustvu autora iz višegodišnje nastavne prakse.

Internet users may be asked to manually provide their contact details, including city or full postal address. Examples include use of trial/free applications and services, filling out on-line surveys and petitions, and membership registration to loyalty programs. Many users may provide their correct location, whereas others may submit inaccurate data. The provided locations are used for geo-analytical purposes, including the interpretation of survey results, online content personalization, and targeted marketing. In this paper, we analyze differences in user behavior when they provide their location. We work with two data sets of user-submitted locations. These data sets differ in how the locations were submitted: voluntary by purpose-aware users without being asked to or by requesting it from common Internet users. The locations from the purpose-aware users were about $2.5\times $ more accurate than from the other users. We also present data for selected countries. The best result was found for the users in the USA with a median error of 44 km (the difference between the correct and user-submitted location). The results also show different user behavior that depends on the place from which they provide their location. The locations submitted from home were $1.5\times $ more accurate than from the office.

This paper should not be understood as the promotion of a new direction, new ideas, but rather as a kind of reading on what has happened and what is happening in field of the traditional/folk musical opinion in Bosnia and Herzegovina. The focus of our interest is on ethnomusicologists of the older generation, active in the period from 1960s to 1990s, although in the end, instead of the conclusion, we will present what is visible in field of applied ethnomusicology for period from the 1990s to this day.

Ovaj tekst ne treba doživjeti kao promicanje novog smjera, novih ideja, nego kao vrstu iščitavanja onog što je bilo i onog što se zbiva u domeni tradicionalnog/folklornog muzičkog mišljenja u Bosni i Hercegovini. U fokusu ove prezentacije su etnomuzikolozi starije generacije koji su djelovali u vremenu od šezdesetih do devedesetih godina prošlog stoljeća, dok ćemo umjesto zaključka na kraju predstaviti ono što je vidljivo u polju aplikativne etnomuzikologije od devedesetih godina do danas.

BACKGROUND/AIMS The best treatment for an avulsed tooth is immediate replantation. If this is not possible, a proper transport medium is required for the maintenance of viability of the periodontal ligament cells (PDL). The aim was to systematically review the efficacy of different storage media used for the survival of PDL cells of avulsed teeth in the in vitro setting. METHODS The search strategy was based on the MeSH keywords in PubMed/MEDLINE: "Transport media for avulsed teeth," "Storage media for avulsed teeth," "Knocked out teeth," "Tooth avulsion," "Biological transport of avulsed tooth," "Cell survival of avulsed tooth," "Cell viability of avulsed tooth," "Tooth replantation," and "Periodontal ligament in avulsed teeth." The "AND" and "OR" Boolean operators were applied to combine keywords. Each study was evaluated for eight criteria, including use of human PDL, in vitro cell culture models, the number of passages, types of storage media, percentages of surviving PDL cells, pH and osmolality of storage media, and the type of test used to asses PDL viability. RESULTS In 15 selected studies, nine storage media (HBSS, tap water, DMEM, milk, saliva, 10% and 20% propolis, Gatorade, and Viaspan) were analyzed at six time points. For storage up to 2 hours, HBSS, DMEM, milk, 10% propolis, 20% propolis, and Viaspan conserved more than 80% of PDL viability. For storage at 24 hours, Viaspan showed best cell survival at 88.4%, followed by DMEM (70.9%) and 10% propolis (68.3%). Milk and HBSS showed similar PDL survival at 24 hours (57.2% and 57.3%, respectively). CONCLUSIONS Milk remains the most convenient, cheapest, and readily available solution in most situations while also being capable of keeping PDL cells alive. Further studies are required to evaluate the efficacy of more commonly found storage media besides milk.