471 research outputs found
Numerical Simulation of the Thermomechanical Behavior of a Hot Stamping Die
For studying the temperature field of hot stamping, the effect of the distance between cooling pipes, the distance between the cooling pipe and mold surface, and the water cooling pipe diameter were evaluated with ANSYS software. The results showed that the maximum temperature was about 50°C, and the maximum temperature difference of hot stamping was less than 35°C. The maximum temperature and the uniformity of stamping temperature can be improved by controlling the size and spacing of cooling pipes.Определен эффект расстояния между трубами охлаждения, расстояния между трубой охлаждения и поверхностью формы и диаметра трубы водяного охлаждения на температурное поле горячей штамповки с использованием программного обеспечения ANSYS. Показано, что максимальная температура составляет примерно 50°С, а максимальный перепад температуры горячей штамповки менее 35°С. Регулирование размеров и расстояния между трубами охлаждения позволяет увеличить максимальную температуру и равномерность распределения
температуры штамповки
Revealing the atomistic origin of the disorder-enhanced Na-storage performance in NaFePO4 battery cathode
Multiple sources of infection and potential endemic characteristics of the large outbreak of dengue in Guangdong in 2014
A large outbreak of dengue, with the most documented cases, occurred in Guangdong China in 2014. Epidemiological studies and phylogenetic analysis of the isolated dengue virus (DENV) showed this outbreak was attributed to multiple sources and caused by at least two genotypes of DENV-1 (Genotypes I and III) and two genotypes of DENV-2 (Cosmopolitan and Asian I Genotypes). A retrospective review and phylogenetic analysis of DENV isolated in Guangdong showed that DENV-1 Genotype I strains were reported continuously during 2004-2014, Genotype III strains were reported during 2009-2014 ; DENV-2 Cosmopolitan and Asian I Genotype strains were reported continuously during 2012-2014. At least 45,171 cases were reported in this outbreak, with 65.9% of the patients in the 21-55-year-old group. A trend toward a decrease in the daily newly emerged cases lagged by approximately 20 days compared with the mosquito density curve. Several epidemiological characteristics of this outbreak and the stably sustained serotypes and genotypes of DENV isolated in Guangdong suggest that Guangdong has been facing a threat of transforming from a dengue epidemic area to an endemic area. The high temperature, drenching rain, rapid urbanization, and pandemic of dengue in Southeast Asia may have contributed to this large outbreak of dengue
Study on the Correlation between the Structure and Toxicity of Amines, Mercaptans and Halohydrocarbons
The aim of the present work was to understand the structure of amines, mercaptans and halohydrocarbons and their cell toxicity effect on rat liver BRL-3A cells. BRL-3A cells were seeded into each well of 96-well plates and treated with amines, mercaptans and halohydrocarbons (total 18 kinds) in DMEM culture medium containing 10% fetal calf serum. 24h later, the growth viability in vitro of BRL3A cells was measured using the MTT assay. The results show that the cytotoxic of propane diamine> ethidene diamine> n-butylamine> n-propylamine> ethylamine, butyl mercaptan> propanethiol> disulfide propane> dithioglycol, n-Butyl iodide> n-Propyl iodide> iodoethane, propylene bromide> 1, 2-dibromoethane> ethyl bromide, ethylene dichloride> butyl chloride> chloropropane. We can conclude that among amines, when the length of carbon chain is fixed, the more amidogen, the stronger the toxicity; when the number of hydroxyl group is fixed, the longer carbon chain, the stronger the toxicity. Among mercaptans, when the length of carbon chain is the same, the more hydrosulphonyl, the weaker the toxicity; when the number of hydrosulphonyl is the same, the longer carbon chain, the weaker the toxicity. Among halohydrocarbons, when the length of carbon chain is fixed, the more halogen, the stronger the toxicity; when the number of halogen is fixed, the longer carbon chain, the stronger the toxicity. Under the same conditions, the toxicity of mercaptans is greater than amines and halohydrocarbons
The development of pharyngeal taste buds in Hucho taimen (Pallas, 1773) larvae
This study aims to investigate the relationship between the development of pharyngeal taste buds (TBs) and first feeding of Hucho taimen. Larvae were fed with live food (water flea and tubifex) for 8 weeks. TBs of larval pharynx were histologically examined using light microscopy during the rearing experiment. The results showed that the first few TBs primordia were visible within the pharynx 27 days after hatch (DAH), which coincides with the onset of feeding, and the first few TBs with open receptor areas appear 45 DAH. TBs of pharynx were well developed 76 DAH. The number and size of TBs were quantified during larval development. The average number of pharynx was 8.63±1.15, 11.29±0.50, 14.50±1.06, and 17.78±0.47 TBs at 27, 36, 45, and 76 DAH, respectively. The number of TBs increased in both the upper and lower pharynx. The ratio of height to width of TBs showed an increase tendency, ranging from 0.81 to 1.11. The height of TBs showed an increase tendency after 29 DAH during the development. However, the width of TBs exhibited a low at 35 DAH. In conclusion, the development of pharyngeal TBs coincides with the first feeding, and this should lead to a better understanding of improvement of larval rearing in H. taimen hatcheries
Direct Measurements of the Branching Fractions for and and Determinations of the Form Factors and
The absolute branching fractions for the decays and
are determined using singly
tagged sample from the data collected around 3.773 GeV with the
BES-II detector at the BEPC. In the system recoiling against the singly tagged
meson, events for and events for decays are observed. Those yield
the absolute branching fractions to be and . The
vector form factors are determined to be
and . The ratio of the two form
factors is measured to be .Comment: 6 pages, 5 figure
Search for the Lepton Flavor Violation Processes and
The lepton flavor violation processes and are
searched for using a sample of 5.8 events collected with
the BESII detector. Zero and one candidate events, consistent with the
estimated background, are observed in and
decays, respectively. Upper limits on the branching ratios are determined to be
and at the 90% confidence level (C.L.).Comment: 9 pages, 2 figure
The pole in
Using a sample of 58 million events recorded in the BESII detector,
the decay is studied. There are conspicuous
and signals. At low mass, a large
broad peak due to the is observed, and its pole position is determined
to be - MeV from the mean of six analyses.
The errors are dominated by the systematic errors.Comment: 15 pages, 6 figures, submitted to PL
Observation of the decay \psip\rar\kstark
Using 14 million events collected with the BESII detector,
branching fractions of \psip\rar\kstarkpm and \kstarknn are determined to
be: \calB(\psip\rar\kstarkpm)=(2.9^{+1.3}_{-1.7}\pm0.4)\times 10^{-5} and
\calB(\psip\rar\kstarknn)=(13.3^{+2.4}_{-2.7}\pm1.9)\times 10^{-5}. The
results confirm the violation of the "12%" rule for these two decay channels
with higher precision. A large isospin violation between the charged and
neutral modes is observed.Comment: 5 pages, 3 figure
Improved protocols of secure quantum communication using W states
Recently, Hwang et al. [Eur. Phys. J. D. 61, 785 (2011)] and Yuan et al.
[Int. J. Theo. Phys. 50, 2403 (2011)] have proposed two efficient protocols of
secure quantum communication using 3-qubit and 4-qubit symmetric W state
respectively. These two dense coding based protocols are generalized and their
efficiencies are considerably improved. Simple bounds on the qubit efficiency
of deterministic secure quantum communication (DSQC) and quantum secure direct
communication (QSDC) protocols are obtained and it is shown that dense coding
is not essential for designing of maximally efficient DSQC and QSDC protocols.
This fact is used to design maximally efficient protocols of DSQC and QSDC
using 3-qubit and 4-qubit W states.Comment: 8 page
- …