On How High-Latitude Chorus Waves Tip the Balance Between Acceleration and Loss of Relativistic Electrons.

Modeling and observations have shown that energy diffusion by chorus waves is an important source of acceleration of electrons to relativistic energies. By performing long-term simulations using the three-dimensional Versatile Electron Radiation Belt code, in this study, we test how the latitudinal dependence of chorus waves can affect the dynamics of the radiation belt electrons. Results show that the variability of chorus waves at high latitudes is critical for modeling of megaelectron volt (MeV) electrons. We show that, depending on the latitudinal distribution of chorus waves under different geomagnetic conditions, they cannot only produce a net acceleration but also a net loss of MeV electrons. Decrease in high-latitude chorus waves can tip the balance between acceleration and loss toward acceleration, or alternatively, the increase in high-latitude waves can result in a net loss of MeV electrons. Variations in high-latitude chorus may account for some of the variability of MeV electrons

Analitic Investigation of the Regularities of Changing Dust Concentration During the Abrasive Decrease of Stone Structures

In the process of repair or restoration of building structures, it is often necessary to strengthen building structures from limestone-shell rock, concrete, reinforced concrete, hard materials-granite, basalt, etc. by cutting or making cuts of the required size with detachable circles of synthetic diamond and cubic boron nitride (CA and CBN)The cutting process is accompanied by considerable dust formation, which can be both harmful and dangerous factor in the work.The aim of the work is studying the process of dust sedimentation and the regularity of the change in dust concentration during the abrasive cutting of concrete and stone materials.Mathematical models have been developed – dust emission from under the wheel, speed of sedimentation of dust particles depending on their material, size and shape, and also depending on temperature, pressure and humidity, the concentration of dust in the working space and the concentration change during the cutting cycle are calculated.It is shown that the velocity of the sedimentation of particles depends significantly on the shape. The higher the sphericity, the higher the sedimentation rate. The ambient temperature has little effect on the sedimentation rate, in the temperature range (-20 → + 40 °C) at which the operation takes place.The sedimentation rate of dust particles generated by cutting the most common building stone materials also differs slightly. Almost the same sedimentation rate has dust particles obtained by cutting basalt and concrete. A bit higher is the sedimentation rate of particles from granite.The sedimentation rate of particles of generated dust is about 600-700 cm/h or 10-11 cm/min for particles measuring 6 μm. This means that at a production height of about 2 m (200 cm) during the operating cycle (about 3 min), the dust will remain at an altitude of about 1.5 m, i.е. practically remains in the working area. This gives grounds to assert about a high concentration of dust during the cutting cycle (about 4.8 108/m3)

Bounds on Unparticles from the Higgs Sector

We study supersymmetric QCD in the conformal window as a laboratory for unparticle physics, and analyze couplings between the unparticle sector and the Higgs sector. These couplings can lead to the unparticle sector being pushed away from its scale invariant fixed point. We show that this implies that low energy experiments will not be able to see unparticle physics, and the best hope of seeing unparticles is in high energy collider experiments such as the Tevatron and the LHC. We also demonstrate how the breaking of scale invariance could be observed at these experiments.Comment: 9 pages, 3 figure

The Use of “Vocabulous: Vocabulary Various” as a Media with Vss Technique to Improve Vocabulary for Seventh Graders

Vocabulary is one of the language skills that relates with word their meanings, glossaries, and some of word used in language which the students are quite familiar with and used to communicate with others. It consists of eight parts of speech which are adjective, adverb, conjuction, interjection, noun, preposition, pronoun and verb. It becomes vital element to learn and acquire language.Vocabulary mastery is needed to develop their four aspects of communication namely, listening, reading, writing and speaking. The research used Quantitative research that was Experimental design to find and measure the improvement of the vocabulary from the test result. The design of this study was one group pre-posttest design. So this study used one class to be applied with the treatment. The data for this research was collected using test and the result of the learners\u27 tasks. The researcher made conclusion from the result of the test and tasks which showed the improvement of their vocabulary mastery. The findings showed that the learners have improved their vocabulary mastery after this study conducted. The score of the posttest was higher than the pretest. In the first meeting, the learners still faced the difficulty to follow the step in analyzed vocabulary with the chart in VSS, then they could follow all the steps easily in the second meeting. And, the result of the learners\u27 task in the second meeting showed the improvement than the first meeting. This study concluded that this study was succesfull to improve the vocabulary through vocabulous. The researcher suggest that this media can applied in the class to engage the learners to remember than improve their vocabulary through vocabulous