On the Mori-Szekely conjectures for the Borel-Cantelli lemma

The purpose of this note is to show by constructing counterexamples that two conjectures of M\'{o}ri and Sz\'{e}kely for the Borel-Cantelli lemma are false.Comment: Accepted by the Studia Scientiarum Mathematicarum Hungarica journa

Ground states solutions for some non-autonomous Schrödinger-Bopp-Podolsky system

In this paper we study the existence of ground states solutions for nonautonomous Schrödinger–Bopp–Podolsky system −∆u + u + λK(x)ϕu = b(x)|u| p−2u in R3 −∆ϕ + a 2∆ 2ϕ = 4πK(x)u 2 in R3 where λ > 0, 2 0 and lim|x|→+∞b(x) = b∞ > 0 and satisfying suitable assumptions, but not requiring any symmetry property on them. We show that the existence of a positive solution depends on the parameters λ and p. We also establish the existence of ground state solutions for the case 3.18 ≈ 1+ 73 3 < p ≤ 4

BIOMECHANICS ANALYSIS OF SNATCHING SKILLS IN WOMEN TOPNOTCH WEIGHT LIFT -A CASE STUDY

This study analyzed the biomechanics characteristics for a Chinese subject's 120 kg snatch skills act mainly through photographing measuring. The result showed: the barbell vertical changes were apparent, the barbell's vertical speed reached its maximum of 1.98 m/s when the barbell was 0.72 s away up the ground, and the barbell reached its highest point of 1.05 m when it was 1.0s away up the ground. It was concluded that the subject's skill showed the characteristic of quick breaking pull

Семантическое поле как метод конструкции языков (на материале китайского и русского языков)

In this article semantic field has been studied as a means of text construction, which is a challenge to the traditional way of study it within the field of lexicology. The research contents that the semantic field reveals promising prospects for the analysis of the semantic relation of lexicon in text, the syntactic semantic relation of text and the semantic construction of text.На протяжении долгого времени использование метода семантического поля ограничивалось рамками описательной лексикологии. По мнению автора данной статьи, семантическое поле обладает также значительным потенциалом в области анализа текста. В статье исследуется вопрос о семантическом поле как методе конструкции стихов и доказывается положение о том, что метод семантического поля открывает новые возможности для построения текста

ELEMENTARY RESEARCH ON THE MOST SUITABLE MODE FOR THE ARCHERS OF THE SHAN DONG TEAM

INTRODUCTION: Archery is an ancient sport. In recent years, the development of archery in China has been quite rapid. The performence of this sport in Shan Dong has also rapidly increased, but it is rare for archers` techniques to be quantitatively analyzed. Therefore the movement strcture, kinematic features and influence on the performence of 6 archers on the Shan Dong team were comprehensively compared and analyzed in order to raise their technical level .The best movement techniques were found and combined in the most suitable mode of these six archers. According to this mode, their techniques were improved individually in training .The more rational movement techniques were performed, followed by an exploration of new ways of scientific training in archery. METHODS: Thirty-six arrow shots of these six archers of the Shan Dong team were analyzed, and the data were processed by the more advanced video analysis system - Bewegungs Analysis System: Pentium 586 computer; 21inch SAMSUNG advanced color monitor (1024%1024); Panasonic Video Cassette Recorder (AG- 7355); the video tape was recorded with time code; the software program to be provided by Germany. The interval between the frames was 0.02 second. The digital filtering method was used for data smothing and a cutoff frequenty of 3 hz was adopted. In measuring, x axis: the direction perpendicular to the target; y axis: the direction perpendicular to the horizontal plane; z axis: the direction of paralleling the target. RESULTS: 1. A comparison and analysis of six archers in each phase period 1.1 The average time for an arrow to be shot by each varies greatly (from 4.812s to 10.956s). The average time for an arrow to be shot by the same archer is relatively stable. The movement rhythm of the six archers is not the same. 1.2 The shooting time of arrows hitting the ten-point ring is ordinarily from 4.78s to 7.84s, and the aiming time is from 2.46s to 5.60s.The shooting time of arrows hitting the eight-point ring is under 4.32s, and the aiming time is under 2.24s. 2. A comparison and analysis of the kinematic features of these six archers was made. CONCLUSION AND SUGGESTION: 1.The movement rhythm of Li Changjun, Tang Huan and Zhu Maodong is relatively fast, The movement rhythm of Xin Lei and Li Ming is relatively slow. The movement techniques of Li Meng and Zhu Maodong in forcing to release period are a bit similar. The movement techniques of Xin Lei and Sun Wei in forcing to release period are a bit similar. 2. The best movement techniques of each can be combined in the most suitable mode to train the archers. 3. In training, the movement technique of some of the archers should be improved with rational technique features. REFERENCES: Jiang Qian et al. (1993). A Study of Elite Chinese Archers’ Aiming Skills. Sports Science of China 1

Coal Mine Gas Emission Gray Dynamic Prediction

AbstractThis paper introduces three kinds of mathematical prediction models: grey prediction, new information, and metabolism. The three prediction models were verified and analyzed by the example of the mine in Hegang, as a result, it is showed that the new information model predictions’ result was more accurate, the information model combines with the monitoring system can realize the dynamics of coal mine gas emission projections

Heatwave Events and Mortality Outcomes in Memphis, Tennessee: Testing Effect Modification by Socioeconomic Status and Urbanicity

Heatwave studies typically estimate heat-related mortality and morbidity risks at the city level; few have addressed the heterogeneous risks by socioeconomic status (SES) and location within a city. This study aimed to examine the impacts of heatwaves on mortality outcomes in Memphis, Tennessee, a Mid-South metropolitan area top-ranked in morbidity and poverty rates, and to investigate the effects of SES and urbanicity. Mortality data were retrieved from the death records in 2008–2017, and temperature data from the Applied Climate Information System. Heatwave days were defined based on four temperature metrics. Heatwave effects on daily total-cause, cardiovascular, and respiratory mortality were evaluated using Poisson regression, accounting for temporal trends, sociodemographic factors, urbanicity, and air pollution. We found higher cardiovascular mortality risk (cumulative RR (relative risk) = 1.25, 95% CI (confidence interval): 1.01–1.55) in heatwave days defined as those with maximum daily temperature \u3e95th percentile for more than two consecutive days. The effects of heatwaves on mortality did not differ by SES, race, or urbanicity. The findings of this study provided evidence to support future heatwave planning and studies of heatwave and health impacts at a coarser geographic resolution

Elucidating the Synergic Effect in Nanoscale MoS\u3csub\u3e2\u3c/sub\u3e/TiO\u3csub\u3e2\u3c/sub\u3e Heterointerface for Na-Ion Storage

Interface engineering in electrode materials is an attractive strategy for enhancing charge storage, enabling fast kinetics, and improving cycling stability for energy storage systems. Nevertheless, the performance improvement is usually ambiguously ascribed to the “synergetic effect”, the fundamental understanding toward the effect of the interface at molecular level in composite materials remains elusive. In this work, a well-defined nanoscale MoS2/TiO2 interface is rationally designed by immobilizing TiO2 nanocrystals on MoS2 nanosheets. The role of heterostructure interface between TiO2 and MoS2 by operando synchrotron X-ray diffraction (sXRD), solid-state nuclear magnetic resonance, and density functional theory calculations is investigated. It is found that the existence of a hetero-interfacial electric field can promote charge transfer kinetics. Based on operando sXRD, it is revealed that the heterostructure follows a solid-solution reaction mechanism with small volume changes during cycling. As such, the electrode demonstrates ultrafast Na+ ions storage of 300 mAh g−1 at 10 A g−1 and excellent reversible capacity of 540 mAh g−1 at 0.2 A g−1. This work provides significant insights into understanding of heterostructure interface at molecular level, which suggests new strategies for creating unconventional nanocomposite electrode materials for energy storage systems

Annual precipitation and daily extreme precipitation distribution: possible trends from 1960 to 2010 in urban areas of China

With global warming, precipitation events are often prone to intensify in some regions. Understanding the changing characteristics of annual and daily extreme precipitation as well as the underlying mechanisms plays an import role for early warning of precipitation-induced disaster (e.g. floods, landslides) and water resources management, especially in densely populated urban areas. In this study, we investigate the long-term trend of annual and daily extreme precipitation in China during 1960–2010 based on daily observations from 539 meteorological stations, and the land cover map with impervious information. We find an overall increasing trend in annual and daily extreme precipitation, particularly in South-East and North-West of China. Moreover, 157 stations located in metropolitan regions experience higher increasing trends of daily extreme precipitation, particularly in Shanghai and Guangzhou metropolitan areas. It is noted that the central urban area of one metropolitan region may have significantly higher increasing trends of daily extreme precipitation than corresponding surrounding areas