No Effect of Steady Rotation on Solid 4^4He in a Torsional Oscillator

We have measured the response of a torsional oscillator containing polycrystalline hcp solid $^{4}$He to applied steady rotation in an attempt to verify the observations of several other groups that were initially interpreted as evidence for macroscopic quantum effects. The geometry of the cell was that of a simple annulus, with a fill line of relatively narrow diameter in the centre of the torsion rod. Varying the angular velocity of rotation up to 2\,rad\,s$^{-1}$ showed that there were no step-like features in the resonant frequency or dissipation of the oscillator and no history dependence, even though we achieved the sensitivity required to detect the various effects seen in earlier experiments on other rotating cryostats. All small changes during rotation were consistent with those occurring with an empty cell. We thus observed no effects on the samples of solid $^4$He attributable to steady rotation.Comment: 8 pages, 3 figures, accepted in J. Low Temp. Phy

Fast Label Extraction in the CDAWG

The compact directed acyclic word graph (CDAWG) of a string $T$ of length $n$ takes space proportional just to the number $e$ of right extensions of the maximal repeats of $T$, and it is thus an appealing index for highly repetitive datasets, like collections of genomes from similar species, in which $e$ grows significantly more slowly than $n$. We reduce from $O(m\log{\log{n}})$ to $O(m)$ the time needed to count the number of occurrences of a pattern of length $m$, using an existing data structure that takes an amount of space proportional to the size of the CDAWG. This implies a reduction from $O(m\log{\log{n}}+\mathtt{occ})$ to $O(m+\mathtt{occ})$ in the time needed to locate all the $\mathtt{occ}$ occurrences of the pattern. We also reduce from $O(k\log{\log{n}})$ to $O(k)$ the time needed to read the $k$ characters of the label of an edge of the suffix tree of $T$, and we reduce from $O(m\log{\log{n}})$ to $O(m)$ the time needed to compute the matching statistics between a query of length $m$ and $T$, using an existing representation of the suffix tree based on the CDAWG. All such improvements derive from extracting the label of a vertex or of an arc of the CDAWG using a straight-line program induced by the reversed CDAWG.Comment: 16 pages, 1 figure. In proceedings of the 24th International Symposium on String Processing and Information Retrieval (SPIRE 2017). arXiv admin note: text overlap with arXiv:1705.0864

Composite repetition-aware data structures

In highly repetitive strings, like collections of genomes from the same species, distinct measures of repetition all grow sublinearly in the length of the text, and indexes targeted to such strings typically depend only on one of these measures. We describe two data structures whose size depends on multiple measures of repetition at once, and that provide competitive tradeoffs between the time for counting and reporting all the exact occurrences of a pattern, and the space taken by the structure. The key component of our constructions is the run-length encoded BWT (RLBWT), which takes space proportional to the number of BWT runs: rather than augmenting RLBWT with suffix array samples, we combine it with data structures from LZ77 indexes, which take space proportional to the number of LZ77 factors, and with the compact directed acyclic word graph (CDAWG), which takes space proportional to the number of extensions of maximal repeats. The combination of CDAWG and RLBWT enables also a new representation of the suffix tree, whose size depends again on the number of extensions of maximal repeats, and that is powerful enough to support matching statistics and constant-space traversal.Comment: (the name of the third co-author was inadvertently omitted from previous version

Роль маркетинга в сфере культуры

Сегодня все мы ощущаем завершение очередного этапа развития нашего общества, который выражается в многочисленных кризисах (политическом, экономическом, экологическом и т.д.), что в полной мере отражает художественная культура

Avalanches in Wood Compression

Wood is a multiscale material exhibiting a complex viscoplastic response. We study avalanches in small wood samples in compression. “Woodquakes” measured by acoustic emission are surprisingly similar to earthquakes and crackling noise in rocks and laboratory tests on brittle materials. Both the distributions of event energies and of waiting (silent) times follow power laws. The stress-strain response exhibits clear signatures of localization of deformation to “weak spots” or softwood layers, as identified using digital image correlation. Even though material structure-dependent localization takes place, the avalanche behavior remains scale-free.Peer reviewe

Investigating thermal properties of gas-filled planetary regoliths using a thermal probe

We introduce a general purpose penetrator, fitted with a heater, for measuring temperature and thermal diffusivity. Due to its simplicity of deployment and operation the penetrator is well suited for remote deployment by spacecraft into a planetary regolith. Thermal measurements in planetary regoliths are required to determine the surface energy balance and to measure their thermal properties. If the regolith is on a planet with an atmosphere a good understanding of the role of convection is required to properly interpret the measurements. This could also help to identify the significant heat and mass exchange mechanisms between the regolith and the atmosphere. To understand the role of convection in our regolith analogues we use a network of temperature sensors placed in the target. In practical applications a penetrator will push material out of the way as it enters a target possible changing its thermal properties. To investigate this effect a custom built test rig, that precisely controls and monitors the motion of the penetrator, is used. The thermal diffusivity of limestone powder and sand is derived by fitting a numerical thermal model to the temperature measurements. Convection seems to play an important role in the transfer of heat in this case. Firstly a diffusion-convection model fits the laboratory data better than a diffusivity-only model. Also the diffusivity derived from a diffusivity-convection model was found to be in good agreement with diffusivity derived using other methods published in the literature. Thermal diffusivity measurements, inspection of the horizontal temperature profiles and visual observations suggests that limestone powder is compacted more readily than sand during entry of the penetrator into the target. For both regolith analogues the disturbance of material around the penetrator was determined to have an insignificant effect on the diffusivity measurements in this case

Suffix Tree of Alignment: An Efficient Index for Similar Data

We consider an index data structure for similar strings. The generalized suffix tree can be a solution for this. The generalized suffix tree of two strings $A$ and $B$ is a compacted trie representing all suffixes in $A$ and $B$. It has $|A|+|B|$ leaves and can be constructed in $O(|A|+|B|)$ time. However, if the two strings are similar, the generalized suffix tree is not efficient because it does not exploit the similarity which is usually represented as an alignment of $A$ and $B$. In this paper we propose a space/time-efficient suffix tree of alignment which wisely exploits the similarity in an alignment. Our suffix tree for an alignment of $A$ and $B$ has $|A| + l_d + l_1$ leaves where $l_d$ is the sum of the lengths of all parts of $B$ different from $A$ and $l_1$ is the sum of the lengths of some common parts of $A$ and $B$. We did not compromise the pattern search to reduce the space. Our suffix tree can be searched for a pattern $P$ in $O(|P|+occ)$ time where $occ$ is the number of occurrences of $P$ in $A$ and $B$. We also present an efficient algorithm to construct the suffix tree of alignment. When the suffix tree is constructed from scratch, the algorithm requires $O(|A| + l_d + l_1 + l_2)$ time where $l_2$ is the sum of the lengths of other common substrings of $A$ and $B$. When the suffix tree of $A$ is already given, it requires $O(l_d + l_1 + l_2)$ time.Comment: 12 page

Developing LCA-based benchmarks for sustainable consumption - for and with users

This article presents the development process of a consumer-oriented, illustrative benchmarking tool enabling consumers to use the results of environmental life cycle assessment (LCA) to make informed decisions. Active and environmentally conscious consumers and environmental communicators were identified as key target groups for this type of information. A brochure presenting the benchmarking tool was developed as an participatory, iterative process involving consumer focus groups, stakeholder workshops and questionnaire-based feedback. In addition to learning what works and what does not, detailed suggestions on improved wording and figures were obtained, as well as a wealth of ideas for future applications

Propagation of thermal excitations in a cluster of vortices in superfluid 3He-B

We describe the first measurement on Andreev scattering of thermal excitations from a vortex configuration with known density, spatial extent, and orientations in 3He-B superfluid. The heat flow from a blackbody radiator in equilibrium rotation at constant angular velocity is measured with two quartz tuning fork oscillators. One oscillator creates a controllable density of excitations at 0.2Tc base temperature and the other records the thermal response. The results are compared to numerical calculations of ballistic propagation of thermal quasiparticles through a cluster of rectilinear vortices.Comment: 6 pages, 4 figure

Mikä Kunto? -viestintäkampanja : Nuorten kuntoutuspalveluiden viestintäkampanjan onnistuneisuus

Kela osallistuu nuorisotakuun toimeenpanoon kuntoutuksen järjestäjänä. Nuoret tuntevat kuntoutusmahdollisuudet huonosti ja kokevat kuntoutuksen palvelujärjestelmän vaikeaselkoiseksi. On arveltu, että monella nuorella saattaisi olla tarvetta opiskelu- ja työkykyä tukevalle kuntoutukselle. Kela toteutti vuosina 2015–2016 Mikä Kunto? -viestintäkampanjan nuorten kuntoutuspalveluista osana kuntoutusviestintänsä kehittämistä. Kampanja oli suunnattu 16–30-vuotiaille nuorille ja niille tahoille, jotka todennäköisimmin ohjaavat nuoria kuntoutuspal-veluihin. Osana kampanjaa perustettiin Mikä Kunto? -verkkosivusto ja tuotettiin mainosvideoita kuntoutuksesta videopalvelu Youtubeen. Kampanjasivustoa mainostettiin muun muassa Facebookissa, internetin mainospaikoilla ja hakusanamainonnalla. Kampanjan tavoitteena oli lisätä nuorten ja nuorten kanssa työskentelevien tietämystä nuorten kuntoutuspalveluista. Tässä tutkimuksessa tarkastellaan, miten Mikä Kunto? -kampanja onnistui sille asetetuissa tavoitteissa. Tutkimuksen informantteina ovat kampanjan kohderyhmänä olleet 16–30-vuotiaat nuoret, kuntoutuksen palveluntuottajat, etsivät nuorisotyöntekijät ja ne Kelan palveluneuvojat, jotka vastaavat Kelan kuntoutuksen palvelunumeroon. Nuorten aineisto (n = 584) kerättiin puhelinhaastatteluna ja kuntoutuksen palveluntuottajien (n = 19), etsivien nuorisotyöntekijöiden (n = 102) sekä Kelan palveluneuvojien (n = 49) aineisto internetkyselynä. Aineisto kerättiin keväällä 2016 eli viisi kuukautta kampanjan viimeisen mainoslähdön jälkeen. Lisäksi tutkimuksessa tarkastellaan kampanjasivuston kävijätietoja, Youtube-videoiden katselukerojen määriä sekä nuorten kuntoutushakemusten määriä. Kampanjasivuston kävijätiedot poimittiin Google Analytics -palvelusta kesäkuussa 2016 ja kuntoutushakemusten määrät Kelan kuntoutuksen ratkaisutilastoista. Enemmistö kuntoutuksen palveluntuottajista ja Kelan palveluneuvojista sekä puolet etsivistä nuorisotyöntekijöistä muisti nähneensä kampanjan. Sen sijaan kolme prosenttia nuorista muisti kampanjan. Kuntoutuksen palveluntuottajat, etsivät nuorisotyöntekijät ja Kelan palveluneuvojat kokivat kampanjan tärkeäksi ja sosiaalisen median hyväksi uudeksi kanavaksi viestiä nuorille kuntoutuspalveluista. Vastaajat antoivat parhaimmat arvosanat kampanjan ilmeelle ja kampanjaviestin ymmärrettävyydelle. He kokivat, että kampanjalla onnistuttiin lisäämään tietoa siitä, miten kuntoutukseen hakeudutaan. Palveluntuottajat, etsivät nuorisotyöntekijät ja Kelan palveluneuvojat kuitenkin kokivat, ettei kampanja ollut tarpeeksi näkyvä ja siitä tiedotettiin heille huonosti. Kampanja ei myöskään juuri näkynyt nuorten yhteydenotoissa heihin. Tilastotarkasteluiden perusteella nuorten kuntoutushakemusten määrissä ei ole havaittavissa merkittävää, kampanjaan yhdistettävissä olevaa kasvua. Tulosten perusteella pelkkä tieto kuntoutuspalveluista ei välttämättä riitä ohjaamaan nuoria kuntoutuspalveluihin. Henkilökohtainen neuvonta ja nykyistä tiiviimpi yhteistyö nuorten kanssa työskentelevien kanssa saattaa olla tehokkaampi tapa saada kuntoutuksesta mahdollisesti hyötyvät nuoret kuntoutuspalveluiden piiriin