Miracle-dz/UniFAR-FTUs huggingface dataset:
Knowledge sharing by entrepreneurs in a virtual community of practice (VCoP)

PurposeThe purpose of this paper is to examine how entrepreneurs engage in a virtual community of practice (VCoP) to share knowledge. Intensity of engagement is taken as a proxy to measure the strength of knowledge sharing.Design/methodology/approachThe archival data spanning over a three-year period from “Start-up-Nation©” (a VCoP purposefully setup for entrepreneurs) are used for analysis. A set of indices are introduced to measure participants’ intensity of engagement in terms of message length, message frequency and reciprocity in the knowledge sharing process. Content analysis is employed to test a sample of “highly engaged”, “moderately engaged”, “low engaged” and “not engaged” discussion topics as part of the online discourse.FindingsThe authors find that entrepreneurs normally use short (fewer than 100 words) or medium (fewer than 250 words) message size to contribute to the discussions. In addition, the authors find that senior members and discussion moderators play important roles in igniting the “reciprocity” behaviour in stimulating the interest of the community with the topic discussion. The authors also find that highly engaged topics usually lead to further discussion threads.Originality/valueThis is the first study of its kind to explore how entrepreneurs engage in a VCoP to share their knowledge and experiences. The set of measurement indices tested here provide a tool for the owner, designer and moderator of the VCoP to measure the utility of their website in terms of its members’ participation. In addition, the set of textual and subjective interventions identified here enables the moderator (administrator) of a VCoP to design effective interventions to facilitate online discourse and augments the knowledge sharing process amongst its community members.
The Interplay of Superconducting Quantum Circuits and Propagating Microwave States

We study the interplay of superconducting quantum circuits and fundamental properties of microwave states. In particular, we analyze loss mechanisms in coplanar waveguide resonators and in superconducting quantum bits. Using quantum bits as detectors, we show the super-Poissonian photon statistics of weak thermal microwaves. We confirm this result by direct measurements of the microwave fields using near-quantum-limited amplifiers. Finally, we study selection rules for quadrupolar quantum bits via the symmetry of microwave fields.
Young Stars in the Gum Nebula Young Stars in the Gum Nebula

Young stars, with an age typically less that 10 million years, provide a fascinating glimpse into how stars like our Sun were created. A special class of these young stars, called T Tauri stars, have a mass similar to the Sun and are in the final stages of being formed. B. Pettersson identified several T Tauri stars in nearby Gum nebula in a 1986 paper. Using modern techniques and a few recent observations, this project sought to characterize the temperature, luminosity, mass, age, and distance of each these stars. This goal was achieved for eight of Pettersson's T Tauri stars, and it was found that they can be divided into two distinct groups, located on opposite sides of the Gum nebula. In addition, evidence was found that the ninth star may in fact be a binary T Tauri system with a long-lived accretion disk.
Search for a Sterile Neutrino in a 3+1 Framework using the Wire-Cell Inclusive Charged-Current ν e Selection from MicroBooNE

A search for a sterile neutrino is being carried out in the MicroBooNE experiment within the 3+1 (three flavors of active neutrinos + one flavor of sterile neutrino) framework using neutrinos from the Booster Neutrino Beam (BNB) at a baseline of about 470 m with an average neutrino energy of 800 MeV. The sensitivity of this search is built upon high performance inclusive charged-current electron neutrino ( ν e ) and muon neutrino ( ν µ ) event selections, which were utilized in the previous search for a low-energy excess (LEE) in the ν e energy spectrum at MicroBooNE. In this note, we present the results of a 3+1 oscillation fit considering both ν e appearance and ν e / ν µ disappearance. Using the first three years’ BNB data, no evidence of a light sterile neutrino was found and 95% C.L. exclusion limits were calculated in the 3+1 neutrino oscillation parameter space. Notably, the cancellation between ν e disappearance and ν e appearance oscillations leads to a reduced oscillation effect in the ν e energy spectrum resulting in a degeneracy of the oscillation parameters. Such a degeneracy is expected to be mitigated by including the neutrino events from the off-axis Neutrino from the Main Injector (NuMI) beam. The prospect of a 3+1 oscillation analysis using both BNB and NuMI is reported and it is expected to considerably improve the sensitivity to 3+1 neutrino oscillations.
Effectiveness of zilpaterol hydrochloride in lamb finishing: Patent vs. Generic

: The objective of this study was to compare the effect of the patent vs. generic sources of zilpaterol hydrochloride (ZH) on the productive performance, carcass characteristics, primary cut yields, and meat quality of lambs finished in feedlot. Thirty (30) Dorper×Pelibuey male lambs were distributed into 10 blocks, each with three lambs of similar initial live weight which were randomly assigned to the following treatments: 1) without ZH (control), 2) with patent ZH (PZH), and 3) with generic ZH (GZH). Treatment means were compared through two orthogonal contrasts: control vs. ZH (PZH+GZH) and PZH vs. GZH. ZH did not affect ( P ≥0.15) the productive performance, carcass weight, backfat thickness, or fat percentages (kidney-pelvic-heart, mesenteric or omental), but increased ( P ≤0.05) Longissimus dorsi muscle area and yields of carcass, shoulder, leg, and plain loin. As for the meat quality, ZH did not affect ( P ≥0.24) pH and shear force, but reduced ( P <0.05) redness, yellowness, and chroma color values at 24 h post mortem , as well as the redness value ( P <0.01) at 14 days of aging. With exception of carcass yield which tended ( P =0.07) to increase with PZH, all measured variables were similar ( P  0.14) between PZH and GZH. It has been concluded that both types of ZH at a dose of 0.10 mg per kg of live weight promote muscular hypertrophy in finishing lambs; however, this dosage is not sufficient to result in a better productive performance or carcass weight.
THE USE OF ACCOUNTING INFORMATION IN THE MANAGEMENT OF MICRO AND SMALL ENTERPRISES IN THE MUNICIPALITY OF POÇÃO/BRAZIL

The objective of this study has been to investigate the use of accounting information in the management of micro and small enterprises in the municipality of Poção, located in the State of Per-nambuco, Brazil. By establishing this objective, the research intends to contribute to the study of the use of accounting information in the management of micro and small enterprises. The research is characterized as descriptive with a quantitative approach, and it has involved field research with the application of a questionnaire to micro and small entrepreneurs in the municipality of Poção. The results have revealed, among other aspects, that most micro and small entrepreneurs who have an accountant in their company use accounting information for decision-making. On the other hand, although 87.9% of the respondents recognize the importance of accounting information for management, 36.4% do not have an accountant. Furthermore, although managers of micro and small enterprises in the municipality of Poção consider accounting information to be important, its use in the decision-making process is not widespread given that their managers generally rely more on their own experience and, in some cases, even on intuition, thus failing to enjoy the benefits that this information can bring to the management of the company.
Standardization of Offshore Surface Wind Speeds

Wind measurement offers an essential data source for a wide range of practices in the ﬁelds of meteo- rology and wind engineering. However, records of surface winds are usually inﬂuenced by terrain/topo-graphic effects, and direct usage of raw data may bring in nonignorable errors for follow-up applications. A data-driven standardization scheme was recently proposed by the authors to convert the surface wind measurements over rugged terrain into their potential values corresponding to reference conditions, that is, for neutral winds at a height of 10 m above open ﬂat terrain ( z 0 5 0.03 m). As a complementary part of the preceding work, this study focuses on the standardization of surface wind speeds with marine exposures. The effect of wind strength on the roughness of the sea surface is further taken into account, with emphasis on the difference between deep-ocean and shallow-water cases. As an application example, wind mea- surements at a buoy site near the coastal line (water depth is 14 m) are adjusted to their potential values, which are then compared with those at a nearby station. The good agreement between the two sets of results demonstrates the accuracy and effectiveness of the standardization method. It is also found that the behavior of roughness length scale over shallow water may differ noticeably from that over deep ocean, especially under strong wind conditions, and an inappropriate usage of marine roughness predictors may result in signiﬁcant estimation errors.
Analysis of central transfer funds and the probability of corruption at the local government level using the Zero-Inflated Poisson method

: The majority of corruption in the regions in Indonesia is carried out on Regional Budget funds, which the main source of Regional Budget revenue comes from Central Government transfers. Based on the characteristics of their use, transfer funds can be classified into General Purpose Transfers (DTU) and Specific Purpose Transfers (DTK). This study was conducted to see the influence of DTU and DTK on the probability of corruption in the regions. The method used is Zero-Inflated Poisson (ZIP) regression because there is an overdispersion problem and excess zero in the dependent variable. With a sample of 519 Regency and City Governments in Indonesia in the 2010-2019 period, DTU was found to have a positive relationship to the level of corruption. The flexibility in managing the DTU budget is the cause that triggers an increase in corruption in the regions. Meanwhile, DTK shows a negative relationship with the level of corruption. The local government does not have the flexibility to use the DTK budget for other programs, and the supervision in the realization of the DTK program is also tighter.
Fast and accurate model for a coax-fed rectangular patch antenna with varying aspect ratio, feed location and substrate electrical parameters

ABSTRACT An improved closed-form model based on cavity model and single resonant parallel R-L-C circuit analysis is proposed to predict the resonant frequency, quality factor, bandwidth, gain and input impedance of a coax-fed rectangular patch antenna as a function of aspect ratio, feed location and substrate electrical parameters. The computed values employing the present model are compared with our experimental results and experimental results available in open literature. We have also employed electromagnetic high-frequency structure simulator (HFSS) software to validate the model. The present model shows very close agreements with the experimental and simulation results compared to the other models. This model is very simple, fast and accurate. The present model can be directly applied to CAD program.
Threats to Human Security and Migration in Guatemala

This study uses survey data gathered in Guatemala in 2006, 2008, 2010, and 2012 to investigate the effects of crime victimization, personal insecurity, family income, personal economic situation, and national economic situation on Guatemalans’ intentions to migrate to another country. Findings from a logistic regression model suggest that Guatemalans who have been victims of crime and live in neighborhoods controlled by gangs are more likely to consider leaving for another country. The study also finds that a low total monthly household income and negative perceptions of the national economy increase intentions to migrate. Given these results, this study discusses important policy implications and offers suggestions for future research.
The Music and Literacy Connection

Is there a connection between music and literacy development? If so, what is this connection? Does the study of or exposure to lllusic have a positive impact on children's literacy development? Finally, if there is a positive relationship, how can elementary classroom and music teachers use music to enhance their students' literacy development? In an attempt to answer such questions, I assembled a literature review of books and articles pertaining to this topic, conducted interviews of professionals in the field (i.e., general music educators and researchers), and collected suggestions for classroom teachers based on this research. After gathering data from the literature review and the interviews, I compared the findings. Both have identified specific connections between literacy and music, and have confirmed that using musical activities is a valid way to support children's literacy development. However, I suggest that further research is needed to strengthen the arguments in favor of a music-literacy connection.
Ultra-Miniaturized Low-Profile Angularly-Stable Frequency Selective Surface Design

In this study, an ultra-miniaturized low-profile angularly-stable frequency selective surface (FSS) based on 2.5-dimension convoluted interwoven element is designed. The dimension of FSS element is 0. 014λ0 × 0. 014λ0, where the λ0 represents the free-space wavelength of resonance frequency. The thickness is only 0. 0015λ0. When the FSS is illuminated by electromagnetic wave, the frequency selective properties perform stable under different incident angles up to 85° for both TE and TM polarization. For better understanding, the operation mechanism, the design procedure, distribution of surface current, and equivalent circuit are presented. A prototype of proposed FSS is fabricated, the measurement results prove the validity of simulated ones. To further improve the performance, using the same design procedure, the size and thickness of designed FSS have been reduced to 0. 0053λ0 × 0. 0053λ0 and 0. 00061λ0, respectively. Since the resonance frequency of proposed FSS is adjustable at any desired frequency, an ultra-miniaturized low-profile angularly-stable FSS for GSM 900 band has been designed. The designed FSS can be applied in GSM shielding effectively.
The mass function in biased galaxy formation scenarios

Une recherche de la meilleure facon d'identifier les objets presents dans le champ de densite primordial et de leur attribuer un distribution de taille logique est presentee. Les objets sont identifies en terme de fonction fenetre adaptative localement dont l'echelle est determinee par le voisinage des maxima. Le spectre de masse etabli a une forme tres proche de la forme classique de Press-Schechter. Une critique et une alternative a la derivation standard de Press-Schechter de la fonction de masse est realisee. Une vue alternative de la fonction de masse dans les scenarios de formation de galaxies biaises est developpee.
Topology on the lattice ; 2 d Yang-Mills theories with a theta term

We study two-dimensional U(N) and SU(N) gauge theories with a topological term on arbitrary surfaces. Starting from a lattice formulation we derive the continuum limit of the action which turns out to be a generalisation of the heat kernel in the presence of a topological term. In the continuum limit we can reconstruct the topological information encoded in the theta term. In the topologically trivial cases the theta term gives only a trivial shift to the ground state energy but in the topologically nontrivial ones it remains to be coupled to the dynamics in the continuum. In particular for the U(N) gauge group on orientable surfaces it gives rise to a phase transition at θ = π, similar to the ones observed in other models. Using the equivalence of 2d QCD and a 1d fermion gas on a circle we rewrite our result in the fermionic language and show that the theta term can be also interpreted as an external magnetic field imposed on the fermions. e-mail: kovacs@physics.ucla. edu e-mail: tomboulis@physics.ucla. edu e-mail: schram@tigris.klte. hu 1
On the origin of medium-period ionospheric waves and their possible modelling: a short review

This article introduces the concept of ionospheric waves with periods from about 15 min to about 4 h as one of the acoustic-gravity wave-induced phenomena. The existence of these medium-period ionospheric waves in the various ionospheric layers is supported by the results of a data analysis which has shown remarkable characteristics in occurrence and direction of the waves with a period not longer than about 2 h. The explanation offered is based on the assumption that a unique phenomenon capable to launch acoustic-gravity waves related to such ionospheric waves is the sudden change in physical conditions of the atmosphere due to the passage of the solar terminator.
Reviews and Notices of Publications

while Wheeler claimed it was npilum that pierced the skull (181). Similarly, the details of the accurate barrage fired at the oppidum of Hod Hill and the gun-emplacements of the subsequent Roman fort may be added. The siegeworks at Burnswark must be included ; G. Jobey and the reviewer have argued that this site was a Roman artillery range. The examples of deployment at Masada and High Rochester are dismissed too lightly (184, n. 1; 191, n. 4, where reference should be CIL vn or better RIB 1280 and 1281, which notes the rebuilding of the ballistarium ; cf. also RIB 1286). Both sites and Risingham, as well as Burnswark (four sizes), have produced examples of stone shot, which might have been used in the discussion on the weight of the ammunition (79-83). The duty roster of A.D. 87 clearly shows other rank legionaries training with artillery (P. Gen. lot i = ChLA 7); the guns employed by Caligula in A.D. 39 were probably on manoeuvres (181, cf. Historia xv (1966), 124-128); the ballistaria at Woden Law were constructed for training ; Suidas (s.v. £eOyncc) records legionaries using artillery in bridge-building in manoeuvres and battle ; Arrian's cavalry manual mentions riders firing missiles from machines. One may also add the study by R. C. Clephan (AA xxiv (1903), 69-114) and replicas in the Museum of Roman Civilization. Some of M. 's views on the Roman army are questionable. The existence of the optio ballistariorum depends on dubious expansions, while the ballistarius principalis is needlessly invented (193) ; from the contexts the ballistarius is more likely the artificer than the gunner (191-192) and is probably identical with the nxixotvoiroios of Dio LXVIII, 9, 5 (cf. LXVII, 7, 4). It may be suggested that Paternus's bucularum structores manufactured the firing mechanisms. Vendennius is the only architectus with a connection with an armoury (185); legionary ones (there were two grades, engineer and craftsmen) were responsible for camp installations ; praetorian evocati ballistarum (Augusti is a restoration, 194) were attached to a central depot at Rome and at times seconded as technical experts to legions. Neither Vendennius nor Felix was necessarily an architectus or ballistarius before discharge. Similarly, the case of Optatus is unique ; he is the chief artillery technician of a later thirdcentury field army (192). The ballistarius Priscinius is based on a false reading (192, see AE 1937, 102). M. 's dating and interpretation of Vegetius's hotchpotch legion are unconvincing (183). Hyginus states that the second-century contubernium contained eight men ; the other six members of the crew are omitted for clarity (192); for the crew one should note Ammianus xxin, 4, 2. These criticisms of the Roman section of the book must not be thought to detract from its manifold merits. The work will prove of great interest to all students of ancient history and warfare. M. 's enthusiasm for his subject has an impact as striking as that of the ancient artillery.
A I ] 1 1 M ay 2 02 1 Vampire With a Brain Is a Good ITP

Vampire has been for a long time the strongest first-order automatic theorem prover, widely used for hammer-style proof automation in ITPs such as Mizar, Isabelle, HOL, and Coq. In this work, we considerably improve the performance of Vampire in hammering over the full Mizar library by enhancing its saturation procedure with efficient neural guidance. In particular, we employ a recently proposed recursive neural network classifying the generated clauses based only on their derivation history. Compared to previous neural methods based on considering the logical content of the clauses, our architecture makes evaluating a single clause much less time consuming. The resulting system shows good learning capability and improves on the state-of-the-art performance on the Mizar library, while proving many theorems that the related ENIGMA system could not prove in a similar hammering evaluation.
Isometric immersions and the generalized Laplace and elliptic sinh-Gordon equations.

We consider isometric immersions/: M" -» ßf with codimension/? = N— « S£ 2 of a connected n-dimensional Riemannian manifold of constant sectional curvature c into a complete simply connected Riemannian manifold of constant sectional curvature c. The study of the case c < c goes back to E. Cartan ([Ca], [MoJ) who showed that /? = « — ! is the lowest possible codimension and, moreover, in that case the normal bündle must be flat. When O c, a large set of (at least local) isometric immersions äs above can be constructed in any codimension by composing umbilical inclusions of Mc" into Q" * with local isometric immersions of Q" into ßf. In fact, for codimension p^n — 29 it has been recently proved ([DTJ) that/must always be such a composition if restricted to any connected component of the open and dense subset of points where some regularity conditions are satisfied.
RESEARCH NOTE: Propagators and Feynman diagrams for laterally heterogeneous elastic media

SUMMARY The propagator for coupled-mode elastic waves can be cast into a number of different representations, which emphasize particular aspects of the wave propagation in a laterally heterogeneous medium. One representation has the form of a generalized scattering operator and contains a quantity that can be interpreted as the lateral impedance. Another representation reduces naturally to the JWKB approximation for smoothly varying media with no mode coupling. The propagator solution for the fields in a laterally heterogeneous elastic medium with weak random boundary fluctuations leads naturally to the application of Feynman diagram techniques for the derivation of Dyson's equation and the Bethe–Salpeter equation for the propagator mean and covariance, respectively. The diagram techniques are reviewed and their utility for solution of random media elastic wave problems is demonstrated.