Preparation of TiC/Ni_3Al Composites by Upward Melt Infiltration

TiC/Ni_3Al composites have been prepared using upward infiltration method. The densification was performed by both Ni_3Al melt filling and TiC sintering during the infiltration. The dissolution of TiC in liquid Ni_3Al has been evidenced by finding Ni_3(Al,Ti)C after fast cooling in the TiC/Ni_3Al composites. The dissolution may be responsible for the infiltration and sintering. Compared with downward infiltration, the upward infiltration brought about higher strength and fracture toughness and shorter infiltration time. TiC/20 vol. pct Ni_3Al composite processed by upward infiltration had a flexural strength of 1476 MPa with a statistic Weibull modulus of 20.2 and a fracture toughness of 20.4 MPa . Better mechanical properties may be attributed to melt unidirectional movement in upward infiltration.

Subsidence control method by inversely-inclined slicing and upward mining for ultra-thick steep seams

Ultra-thick steep coal seam mining will inevitably lead to the increase of greater and violent ground subsidence and deformation.A subsidence control method by inversely-inclined slicing and upward mining is proposed in this paper.By this method,the sequence of collapse of overlying strata and the direction of propagation of strata movement are changed,the extent of roof-side deformation thereby is lessened,and boundary angle of roof-side subsidence is reduced by 5°-10°.The mechanism of this mining method for control of strata movement has been evidenced by numerical simulation and experiments with similarity materials.A subsidence prediction model based on the variation of mining influence propagation angle can be used to evaluate the surface movement and deformation of the mining method.The application of the method in No.3 Mine in Yaojie mining area has yielded the expected result.

Numerical Simulation to Evaluate the Effects of Upward Lightning Discharges on Thunderstorm Electrical Parameters

A theoretical discussion of the discharge effects of upward lightning simulated with a fine-resolution 2D thunderstorm model is performed in this paper,and the results reveal that the estimates of the total induced charge on the upward lightning discharge channels range from 0.67 to 118.8 C,and the average value is 19.0 C,while the ratio of the induced charge on the leader channels to the total opposite-polarity charge in the discharge region ranges from 5.9%to 47.3%,with an average value of 14.7%.Moreover,the average value of the space electrostatic energy consumed by upward lightning is 1.06×10^9 J.The above values are lower than those related to intracloud lightning discharges.The density of the deposited opposite-polarity charge is comparable in magnitude to that of the preexisting charge in the discharge area,and the deposition of these opposite-polarity charges rapidly destroys the original space potential well in the discharge area and greatly reduces the space electric field strength.In addition,these opposite-polarity charges are redistributed with the development of thunderstorms.The space charge redistribution caused by lightning discharges partly accounts for the complexity of the charge structures in a thunderstorm,and the complexity gradually decreases with the charge neutralization process.

An Upward Shallowing Succession of Gravity Flow Deposits in the Early Cretaceous Lingshandao Formation,Western Yellow Sea

Objective Several well-exposed gravity flow deposits in the Early Cretaceous Lingshandao Formation provide a rare opportunity to study deep-water processes. The main objective of this work is to establish the spatial and temporal relationships between the various gravity flow deposits, and thus to establish their sequence stratigraphic patterns and depositional conditions.

Effect of Upward Internal Flow on Dynamics of Riser Model Subject to Shear Current

Numerical study about vortex-induced vibration （V/V） related to a flexible riser model in consideration of internal flow progressing inside has been performed. The main objective of this work is to investigate the coupled fluid-structure interaction （FSI） taking place between tensioned riser model, external shear current and upward-progressing internal flow （from ocean bottom to surface）. A CAE technology behind the current research which combines structural software with the CFD technology has been proposed. According to the result from dynamic analysis, it has been found that the existence of upward-progressing internal flow does play an important role in determining the vibration mode （/dominant frequency）, vibration intensity and the magnitude of instantaneous vibration amplitude, when the velocity ratio of internal flow against external current is relatively high. As a rule, the larger the velocity of intemal flow is, the more it contributes to the dynamic vibration response of the flexible riser model. In addition, multi-modal vibration phenomenon has been widely observed, for asymmetric curvature along the riser span emerges in the case of external shear current being imposed.

Effect of upward seepage on bedload transport rate

The paper presents an investigation of injection effects on the bedload transport rate. According to dimensional analysis, two dimensionless groups, an Einstein＇s parameter group and a modified densimetric Froude number group, were chosen to examine how injection affects the bedload transport rate. Experimental studies were conducted in an open-channel flume with an upward seepage zone. The sediment particles used for the test were 0.9 mm in diameter. The experimental results show that an increase in the injection velocity causes a reduction in the shear velocity excess, which is defined as the difference between the shear and critical shear velocities, leading to a reduction in the bedload transport rate. The equation for predicting the bedload transport rate in the presence of upward seepage was derived empirically. The proposed prediction method is suitable for engineering practice, since it only requires the undisturbed flow condition, properties of sediment particles, and the injection velocity.

SOME RESULTS ON TOPICAL FUNCTIONS AND UPWARD SETS

The purpose of this paper is to introduce and discuss the concept of topical functions on upward sets. We give characterizations of topical functions in terms of upward sets.

Resorption of upwardly displaced lumbar disk herniation after nonsurgical treatment: A case report

BACKGROUND The spontaneous resorption of lumbar disk herniations(LDHs)has been widely reported.However,the majority of these reports analyze the resorption of LDHs that were displaced backwards or downwards.There have been few reports on the spontaneous resorption of upwardly displaced L4/5 LDH that has caused femoral nerve symptoms.CASE SUMMARY A 55-year-old woman presented to our hospital with acute pain in her left leg.She had been suffering from recurrent lower back pain for approximately 1 year and began to feel pain accompanied with numbness at the anterior aspect of her left leg 7 d previously.On examination,a typical L4 nerve stimulation was noted.An upwardly displaced LDH at the L4/5 level was revealed by magnetic resonance imaging.The patient attained complete relief of her symptoms after 10 wk of nonsurgical treatment and the upwardly displaced herniation almost entirely disappeared.There was no recurrence during a follow-up of 2 years.CONCLUSION Clinicians should be aware that the nerves disturbed by LDHs vary according to the direction of the herniations and the probable resorption of upwardly displaced LDHs should be considered before making a decision on surgery.

Experimental study on upward bubble velocity and pierce length distributions in a water model of copper converter

The upward bubble velocity and the pierce length distributions in a sectionalwater model of the copper converter in Guixi Smelter in Jiangxi, China, were measured using atwo-contact electro-resistivity probe. In the case of using a single tuyere, the bubble velocitydistribution along longitudinal direction was similar to that derived from Guassian function. Beyondthe center of the longitudinal range, the bubble pierce length exhibited a sudden increase. Theupward bubble velocity at a specified location could go up to meters per second. Its probability ata fixed location obeys a lognormal function; the bubble pierce length there varies bellow a fewcentimeters. In the case of using multi-tuyeres, the upward bubble velocity was roughly uniformright above the tuyeres and showed a slow decrease beyond this region. The bubble pierce lengthwithin both of these two regions was roughly uniform. Its average value in the former region,however, was found to he somewhat lower than that in the later.

Storm Deposits of the Sinian Zhangqu Formation in Northern Anhui——An Upward Shallowing Carbonate Sequence

This paper studies. for the first time, the storm deposits of a carbonate sequence in the Sinian ZhangquFormation in northern Anhui. In the formation. a great number of calcareous trider sponge spicules were dis-covered in a distal storm turbidity sequence, which have provided further evidence for the correlation of theSinian Systems in North and South China from a view point of palaeontology.

OPTIMAL SCHEME FOR SEQUENTIAL COMPUTATIONS OF F_m(z) INTEGRALS IN AB INITIO CALCULATIONS----COMBINATORY USE OF UPWARD AND DOWNWARD RECURSIONS

The quantitative rules of the transfer and variation of errors,when the Gaussian integral functions F.(z) are evaluated sequentially by recurring,have been expounded.The traditional viewpoint to negate the applicability and reliability of upward recursive formula in principle is amended.An optimal scheme of upward-and downward-joint recursions has been developed for the sequential F(z) computations.No additional accuracy is needed with the fundamental term of recursion because the absolute error of Fn(z) always decreases with the recursive approach.The scheme can be employed in modifying any of existent subprograms for Fn<z> computations.In the case of p-d-f-and g-type Gaussians,combining this method with Schaad's formulas can reduce,at least,the additive operations by a factor 40%;the multiplicative and exponential operations by a factor 60%.

The Upward Issue of Agricultural Products Based on Farmer Cooperatives in the Context of Internet

In recent years,the development of rural e-commerce has been rapid but not balanced,and the upward scale of agricultural products is much smaller than the downward scale of industrial products.In the upward process of agricultural products,there are different models of e-commerce with farmers as the main body or cooperatives as the main body.Comparatively speaking,the difficulties in developing e-commerce for agricultural products with farmers as the main body are more prominent,while the development of e-commerce in agricultural products with cooperatives as the main body has more significant advantages.At present,there are still urgent problems to be solved,such as insufficient cold chain logistics facilities,insufficient scale and strength of cooperatives,and lack of systematic planning of local government's support policies for agricultural products.However,generally speaking,the upward trend for agricultural products based on cooperatives will be the mainstream of the development of agricultural electronic commerce in the future.

Upward Transition Probabilities B(E2)↑ Properties Study of Even-Even ^104-114Ru Nuclei

In this research work, the upward transition probabilities for the transition levels, 0+ → 2+, 2+ → 4+, 4+ → 6+ and 6+ → 8+ levels of even-even neutron rich 104-114Ru isotopes have been calculated by using the Global Best Fit (GBF) method. In addition, the associated parameters such as, Quadrupole moment and Deformation parameter of even-even 104-114Ru have been calculated. The dependency of these nuclear parameters shows the nuclear magic number tendency.

The Effect of WeChat Usage on Upward Social Comparison in Undergraduates

To explore the status of undergraduates’WeChat usage and upward social comparison,and analyze the relationship between the above two variables.Totally 754 WeChat undergraduates were selected through poster recruitment from 5 colleges in Guangdong Province.They were investigated with Access Frequency to Social Networking Site Scale(AFSNSS),Upward Social Comparison Subscale of Iowa-Nwtherlands Comparison Orientation Measure(INCOM-USCS).The score of overall emotional engagement(OEE)of AFSNSS and the total standard score of INCOM–USCS(TSSI-U)were(22.41±4.70)and(0±4.5),respectively.The correlation between WeChat frequency and TSSI-U was not significant.TSSI-U was significantly positively correlated with the score of OEE and other items of AFSNSS(r=0.161~0.413,P<0.01).Multiple linear regression analysis showed that The scores of item 1,7and 8 of AFSNSS,as well as family economic status,grade ranking of academic performance(GRAP)and the purpose of WeChat use were postively correlated with TSSI-U(β=.104~.234,P<.05).Class cadre or not and origin were negatively correlated with TSSI-U(β=-.089,-.130,P<.05).Conclusion:It suggests that WeChat usage may be a related factor for undergraduates’upward social comparison.

A survey of Higher Vocational Students' upward Comparative Parenting

This study is aim at investigate the current situation of higher vocational students receiving upward comparative parenting and the differences in upward comparative parenting among higher vocational college students with different demographic variables.By using the self-designed upward comparative parenting questionnaire to survey 1075 higher vocational college students,the results show that:In general,higher vocational college students receive the highest frequency of upward Comparative Parenting(2.95±1.57)on the level of learning diligence,and the frequency of upward Comparative Parenting(2.62±1.27)for male higher vocational students is higher than that for female students(2.39±1.17).The subjects from urban areas(2.56±1.29)were significantly higher than those from rural areas(2.39±1.14).Conclusion:upward comparat ive parenting is a common phenomenon among higher vocational college students in China.

The Periodic Table of Elementary Particles for Baryonic Matter and Dark Matter: Upward-Going ANITA Events

This paper posits that the upward-going ANITA events are derived from the cosmic ray of the baryonic-dark matter (BDM) Higgs boson. In the extended standard model (ESM) for baryonic matter and dark matter, the spontaneous symmetry breaking through the Higgs mechanism for the symmetrical massless baryonic matter left-handed neutrinos and massless dark matter right-handed neutrinos produced massless baryonic matter left-handed neutrinos, sterile massive dark matter neutrinos, and the BDM Higgs boson. The BDM Higgs boson is the composite of the high-mass tau neutrino and the high-mass dark matter neutrino. During the passage through the high-density part of the Earth, the BDM Higgs boson is transformed into the oscillating BDM Higgs boson between the composite of the high-mass tau neutrino and the high-mass dark matter neutrino and the composite of the high-mass tau neutrino and the low-mass dark matter neutrino. The oscillating BDM Higgs boson decays into the high-mass tau neutrino with the extra energy and the low-mass dark matter neutrino (27 eV) in the low-density water-ice layer of the Earth. The high-mass tau neutrino is converted into ultra-high-energy tau neutrino which decays into tau lepton through the charged-current interactions, and tau lepton emerges from the surface of ice. Based on the periodic table of elementary particles, the calculated value for the high-mass tau neutrino with the extra energy is 0.47 EeV in good agreement with the observed 0.56 and 0.6 EeV. The periodic table of elementary particles for baryonic matter, dark matter, and gravity is based on the seven principal mass dimensional orbitals for stable baryonic matter leptons (electron and left-handed neutrinos), gauge bosons, gravity, and dark matter and the seven auxiliary mass dimensional orbitals for unstable leptons (muon and tau) and quarks, and calculates accurately the masses of all elementary particles and the cosmic rays by using only five known constants.

Consumption of Three Main Products Continues Upward Climb

China’s retail sales maintain fast growth since Apr., thanks to the nation’s consumption-boosting policies. From January to August, the total industrial production value of statistics-worthy Chinese textile enterprises edged up 11.67 percent year-on-year.

Upward Ever Upward

＂THE world is small,＂ said Confucius.When he made that comment he was standing 1,545 meters above sea level on the top of Taishan Mountain（Mount Tai）.Standing on the same spot,one wonders if the great sage had a premonition about globalization,or he just marveled at the bird＇s eye view.

Climate Warming-induced Upward Shift of Moso Bamboo Population on Tianmu Mountain,China

Although increasing attention has been paid to upward shift of plant species in altitude as a response to global warming,research on this phenomenon at low altitudinal and low latitudinal zones did not receive enough attention.In this study,an investigation was carried out to test the relationship between the upward spread of Moso bamboo(Phyllostachys pubescens) along altitudinal gradient and the increasing air temperature over the past decade within the Tianmu Mountain region,situated in southeastern China.Results showed that the peak elevation of Moso bamboo population establishment rose by an average of 9.8 m(±2.7 m) during the past decade and significant correlation existed with mean annual temperature(P < 0.0001,n = 339) but not with annual precipitation(P = 0.7,n = 339),indicating that the upward shift of Moso bamboo along altitudinal gradients was driven primarily by warming temperatures.This upward shift could potentially reduce biodiversity by altering the species composition of the ecosystem.However,there is also the potential for increased carbon sequestration capacity of local forest systems,which would produce an additional carbon sink to combat rising atmospheric CO 2 concentrations and future global warming.