More than the Quantity: The Value of Editorial Reviews for a User-Generated Content Platform

We investigate an editorial review program for which a review platform supplements user reviews with editorial ones written by professional writers. Specifically, we examine whether and how editorial reviews influence subsequent user reviews (reviews written by noneditor reviewers). A quasiexperiment conducted on a leading review platform in Asia, based on several econometric and natural language processing techniques, yields empirical evidence of an overall positive effect of editorial reviews on subsequent user reviews from the platform’s perspective. First, more reviews are provided for restaurants that receive editorial reviews. In addition, these reviews discuss substantive topics while also including a discussion on other topics, leading to a net increase in content length and variety. They also are more neutral in sentiment and are associated with lower rating valences. Further analysis of the mechanism reveals that the subsequent user reviews of the restaurants that receive editorial reviews become more similar to the editorial reviews in regard to topics, sentiment/rating, length, and readability, indicating a herding effect in how to write a review as the main driver of the change in the subsequent reviews. We further empirically isolate this herding effect among long-time reviewers. The findings suggest that review platforms could use an editorial review program not only to boost the quantitative aspect of user reviews but also, to manage the qualitative aspect as well. This paper was accepted by Kartik Hosanagar, information systems.

Influence of Sports Games on Coordination Abilities of Adolescents as a Component of Physical Development: Neuropsychological Features

The article reveals perspectives on sports games aimed at physical development and development of coordination skills of adolescents. Physical exercise has a positive effect on such psychological properties of students as memory, thinking, attention, speed and accuracy of reactions, logic, perception of motoric of one’s own body and the sense of external space. The basic statement of neuropsychology that the basic intelligence of a person being physical intelligence is revealed. Development of coordination skills is an important qualitative aspect of motor activity, reflecting the level of physical fitness. Purposeful formation of coordination abilities enables to solve a number of problems of physical, aesthetic and intellectual improvement of adolescent students. The use of sports games in the process of physical education promotes a favourable development of motor coordination, and thus helps increase the level of motor readiness of adolescents during sports activities, as well as provides the highest efficiency in the process of physical development.

Einstein's Elevator: World Lines, Michelson-Morley Experiment and Relativistic Paradox

We all have in mind Einstein's famous thought experiment in the elevator where we observe the free fall of a body, and then the trajectory of a light ray. Simply here, in addition to the qualitative aspect, we carry out the exact calculation, and for the first time the worldlines equations are given. We consider a uniformly accelerated reference frame in rectilinear translation, and we show that the trajectories of the particles are semi-ellipses with the center on the event horizon. The frame of reference is non-inertial, the space-time is flat, and the computations are performed within the framework of special relativity. Some experimental consequences are discussed, especially the experiment with the accelerated Michelson-Morley interferometer is solved, and we described an experiment where a new relativistic paradox appears --- a particle of matter seems to go faster than light. The differences, compared to the classical case, are important at large scale and close to the horizon, but they are small in the lift where the interest is above all theoretical. The concepts of metric, coordinated velocity and horizon are discussed, and the analogy with the black hole is made.

World Lines in Einstein's Elevator

We all have in mind Einstein's famous thought experiment in the elevator where we observe the free fall of a body, and then the trajectory of a light ray. Simply here, in addition to the qualitative aspect, we carry out the exact calculation. We consider a uniformly accelerated reference frame in rectilinear translation, and we show that the trajectories of the particles are semi-ellipses with the center on the event horizon. The frame of reference is non-inertial, the space-time is flat, the metric is non-Minkowskian, and the computations are performed within the framework of special relativity. Some experimental consequences are discussed, such as the deviation of trajectories, the desynchronization of a falling clock, the accelerated Michelson-Morley experiment, and, finally, an experiment where a paradox appears — a particle of matter seems to go faster than light. The differences, compared to the classical case, are important at large scale and close to the horizon, but they are small in the lift where the interest is above all theoretical. The concepts of metric, coordinated velocity and horizon are discussed, and the analogy with the black hole is made.

World Lines in Einstein's Elevator

We all have in mind Einstein’s famous thought experiment in the elevator where we observe the free fall of a body, and then the trajectory of a light ray. Simply here, in addition to the qualitative aspect, we carry out the exact calculation. We consider a uniformly accelerated reference frame in rectilinear translation, and we show that the trajectories of the particles are ellipses centered on the event horizon. The frame of reference is non-inertial, the space-time is flat, the metric is non-Minkowskian, and the computations are performed within the framework of special relativity. Some experimental consequences are discussed, such as the deviation of trajectories, the desynchronization of a falling clock, the accelerated Michelson-Morley experiment, and, finally, an experiment where a paradox appears — a particle of matter seems to go faster than light. The differences, compared to the classical case, are important at large scale and close to the horizon, but they are small in the lift where the interest is above all theoretical and pedagogical. The study helps the student to become familiar with the concepts of metric, coordinate velocity, horizon, and, to do the analogy with the black hole.

World Lines in Einstein's Elevator

We all have in mind Einstein's famous thought experiment in the elevator where we observe the free fall of a body and then the trajectory of a light ray. Simply here, in addition to the qualitative aspect, we carry out the exact calculation. We consider a uniformly accelerated reference frame in rectilinear translation and we show that the trajectories of the particles are ellipses centered on the horizon of the events. The frame of reference is non-inertial, the space-time is flat, the metric is non-Minkowskian and the computations are performed within the framework of special relativity. Some experimental consequences are discussed such as trajectory deviation, desynchronization of a falling clock and the Michelson interferometer. The differences, compared to the classical case, are important at large scale and close to the horizon, but they are small in the box where the interest is above all theoretical and pedagogical. The study helps the student to become familiar with the concepts of metric, coordinate velocity, horizon, and, to do the analogy with the black hole.

Coniferous forest crops wave growth theory grounding

The results of long-term observations on the dynamics of mortality and the dynamics of the current growth in artificial plantations of conifers are presented. In pine forest plantations, the mortality rate was analyzed depending on the planting density and on the method of creating an artificial plantation (sowing, planting). Shown is the qualitative aspect of mortality at different age stages and phases of growth of forest cultures. A conclusion is made about the natural phenomenon of the course of wave periods in relation to the number of dying trees and the dynamics of the current growth of growing trees. The undulation of the process of natural thinning of forest cultures is confined to qualitatively new restructuring of the vital structure of the tree community. It has been established that with age, the wave-like process acquires the character of attenuation and in the phase of ripeness it smoothes out significantly, finally fading out in the phase of decay.

Exploring Existential Anxiety among Indian Youth: Prevalence and Gender Differences

Background: Existential anxiety (EA) refers to the feeling of uncertainty regarding life and its meaning. It is gaining increasing attention on social media in the form of existential humour. The present study aimed to explore the prevalence of EA among Indian youth and gender differences among those experiencing EA. Method: The sample consisted of 30 males and 39 females (N = 69) falling in the age range of 17-29 years. The quantitative tool used was the Existential Concerns Questionnaire. For the qualitative aspect, three open-ended questions were given at the end of the scale. Result: Upon analysing the quantitative data, it was found that there existed no significant differences (p = 0.24) between the EA levels of males (M = 52.53, SD = 16.73; moderate) and females (M = 56.97, SD = 14.20; moderate). Thematic network analysis of the qualitative data revealed common themes amongst the genders (uncertainty, negative emotions, competition/ success, meaning-making, social media, and life events). The only theme that was present among females was that of social pressures. Conclusion: There is a medium-low EA prevalence rate among the participants. Furthermore, major gender differences don’t seem to exist in the experience of such anxiety, barring the theme of social pressures which affects the females.