BcB_{c} →{\to} BPBP, BVBV decays with the QCD factorization approach

We studied the nonleptonic $B_{c}$ ${\to}$ $BP$, $BV$ decay with the QCD factorization approach. It is found that the Cabibbo favored processes of $B_{c}$ ${\to}$ $B_{s}{\pi}$, $B_{s}{\rho}$, $B_{u}\bar{K}$ are the promising decay channels with branching ratio larger than 1\%, which should be observed earlier by the LHCb Collaboration.Comment: 15 pages, revtex4, version appeared in Advances in High Energy Physic

The Correlation Between Snakebites And Meteorological Variations

Background: In the United States, approximately 45,000 snakebites occur annually and affect many people including veterinarians and farmers.1 Snakebites can cause significant pain and morbidity such as severe bleeding and skin necrosis. Better predictive information on snakebite risk could help prevent snakebites by identifying high risk time periods, weather patterns, and locations. Methods: This was a retrospective analysis of the New Mexico State Poison Control Center data between January 1998 and December 2012. Monthly average meteorological data were obtained from the Parameter-elevation Regressions on Independent Slopes Model climate group. Locations of the bites were categorized as urban or rural based on the National Center for Health Statistics urban-rural classification scheme for counties. Poison regression modeling was used to evaluate the influence of urban-rural locations and meteorological factors on snakebite incidence. Results: A total of 928 snakebites was reported and the number per year appeared to be trending up in recent years. The groups most affected by snakebites were males and those aged 45 to 49 years. Most snakebite cases were of moderate medical severity and were reported in the late afternoon or evening. A trend of increasing incidence was noted. A Poisson regression model was constructed, which found a positive association between snakebite incidence and population density in rural areas as well as higher monthly average minimum temperature. Being in an urban location was negatively associated with snakebite incidences. Discussion: In this study, the majority of the reported snakebites resulted in significant morbidity and males were disproportionately affected by snakebites. Snakebites were more common in rural areas, and during times of higher minimum temperature. These findings suggest that predictive models for snakebite risk may be helpful in shaping preventive strategies

Contacts between the Mongols and the Latin West in the Thirteenth Century— Seen from Rabban Sawma’s Westward Mission

The rising of the Mongol Empire made it convenient for missionaries, diplomats and merchants to travel across the Eurasia landmass. Direct contact between the extremes of Eurasia was thus possible. In the thirteenth century, Rabban Sawma from the East journeyed westward as far as Europe and left an account of his travels. Instead of focusing on his depiction of the political and religious situation in Western Asia, this paper looks at the aspects revealing his personal encounter with the Latin West, aiming to fill the gap in our knowledge of East-West encounters in the thirteenth century

Research on Decision Market Model of Public Decision Problems in the Context of Big Data

Decision markets are a method of community information gathering, so that market methods can be used to deal with public decision problems. The decision made by the decision makers can be shown as an equilibrium price. This thesis would design a Public Decision Markets model based on the principles of futures market. By using market principles to gather public decision preferences and use the equilibrium price to represent understandings. This model would be able to represent public intelligence level on public decision making. First transferring the binary decision market into a tradeable contract. Then make personal trading decisions under market environments. Finally, calculate the equilibrium price based on the total demand and total supply, providing a group consensus on the public decision issue. At the end of the thesis, it would provide cases where publicity tactics were decided upon the market acceptance. Proving this public decision model can effectively generate decision under big data context, while the tendency of group consensus was underestimated

Eastern View and Knowledge of Europe in the Thirteenth Century

Infrequent communications between the extremes of Eurasia existed prior to the Mongols, but they were often through intermediaries. Despite of its destructive force, the rise of the Mongol Empire allowed merchants and missionaries to transverse Eurasia. The conquests in many ways changed and enriched Eastern knowledge of Europe. This paper will firstly introduce what was known of Europe from a small quantity of Chinese and Mongol source material, including records mentioning the ‘Franks’ in the Early Yuan Period. The Mongol view and knowledge of Christian Europe in the thirteenth century will be discussed. The paper will be ended by examining Rabban Sawma’s mission to the Latin West