924 research outputs found
The Calder\'{o}n problem for nonlocal parabolic operators
We investigate inverse problems in the determination of leading coefficients
for nonlocal parabolic operators, by knowing the corresponding Cauchy data in
the exterior space-time domain. The key contribution is that we reduce nonlocal
parabolic inverse problems to the corresponding local inverse problems with the
lateral boundary Cauchy data. In addition, we derive a new equation and offer a
novel proof of the unique continuation property for this new equation. We also
build both uniqueness and non-uniqueness results for both nonlocal isotropic
and anisotropic parabolic Calder\'on problems, respectively.Comment: 34 pages. All comments are welcom
KINEMATICS ANALYSIS OF THE UPPER EXTREMITY DURING THE TWOHANDED BACKHAND DRIVE VOLLEY FOR FEMALE TENNIS PLAYERS
The purpose of this study was to discuss the motion characteristics of the arms in the two-handed backhand drive volley. Five elite female tennis players participated in this study, their two-handed backhand drive volley strokes were analysed, and all participants are right handed. Motion Analysis System with 10 Eagle Digital inferred high speed cameras at 200Hz were used for this study. The results show a similar elbow and wrist speed strategy in x-axis between two-handed ground stroke and drive volley, our study also found that the rear arm dominates the stroke and mainly provide the topspin that is required for the skill of the drive volley. In order to create better stroke efficiency, the right elbow reached peak velocity first, followed by the right wrist before racket impact with the ball
Alcohol Use, Abuse, and Dependency in Shanghai
The use of alcohol for social and ceremonial occasions was recorded in Chinese history as early as 1760 B.C. during the Yin Dynasty (Ci-Hai Encyclopedia, 1979:936). The cultural tradition of ancient China placed alcoholic beverages at the center of social occasions, which presumably was the origin of the adage: Without wine, there is no li (or etiquette). Thus, the use of alcoholic beverages has always been accompanied by the concept of propriety and the discharging of one\u27s role obligations m social functions, rather than that of personal indulgence
Reduction in nausea and vomiting in children undergoing cancer chemotherapy by either appropriate or sham auricular acupuncture points with standard care
Mass-accretion, spectral, and photometric properties of T Tauri stars in Taurus based on TESS and LAMOST
We present the analysis of 16 classical T Taur stars using LAMOST and TESS
data, investigating spectral properties, photometric variations, and
mass-accretion rates. All 16 stars exhibit emissions in H lines, from
which the average mass-accretion rate of
is derived. Two of the stars, DL Tau and Haro 6-13, show mass-accretion bursts
simultaneously in TESS, ASAS-SN, and/or ZTF survey. Based on these
observations, we find that the mass-accretion rates of DL Tau and Haro 6-13
reach their maximums of and during the TESS observation, respectively. We detect
thirteen flares among these stars. The flare frequency distribution shows that
the CTTSs' flare activity is not only dominated by strong flares with high
energy but much more active than those of solar-type and young low-mass stars.
By comparing the variability classes reported in the literature, we find that
the transition timescale between different classes of variability in CTTSs,
such as from Stochastic (S) to Bursting (B) or from quasi-periodic symmetric
(QPS) to quasi-periodic dipping (QPD), may range from 1.6 to 4 years. We
observe no significant correlation between inclination and mass-accretion rates
derived from the emission indicators. This suggests that inner disk properties
may be more important than that of outer disk. Finally, we find a relatively
significant positive correlation between the asymmetric metric "M" and the cold
disk inclination compared to the literature. A weak negative correlation
between the periodicity metric "Q" value and inclination has been also found.Comment: 39 pages, 22 figures, 8 table
THE EFFECTS Of VOLLEYBALL ATTACKING ON SCORE POINTS: A CASE STUDY OF 2014 TVL IN TAIWAN
Volleyball is a sport in which team tactical and players' attacking skills determine to score points. Therefore, an effective team tactical is achieved by main spikers' and middle blockers' skills. To name but a few, delayed spike, open spike and back-row spike are main spikers' skills, yet quick spike, and individual time difference attack are associated with middle blockers'. Under this aspect, a case study of male teams of Taiwan Top Volleyball League (TVL) was yield out, which aimed at exploring the effects of team tactical and players attacking skills on score points. The results indicated that the attacking point ratio of main spikers and middle blockers in the champion team was higher than others. This was because the middle blockers gave cover to main spikers as attacking. By doing so, it promoted point ratio to main spikers. Furthermore, it found that to strengthen main spikers and middle blockers' skills would increase team's attacking point ratio
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