Different scaling behaviors in daily temperature records over China

Long-range correlations of five kinds of daily temperature records (i.e. daily average temperature records, daily maximum temperature records, daily minimum temperature records, diurnal temperature range and the sum of daily maximum and minimum temperature records) from 164 weather stations over China during 1951-2004 are analyzed by means of detrended fluctuation analysis (DFA). These five kinds of fluctuation series are found to be power-law correlated with scaling exponents larger than 0.5. Local changes of scaling exponents are examined and the spatial distributions of these different kinds of temperature records are similar except the diurnal temperature range (DTR for short) records. Furthermore, the differences of the scaling behavior among diurnal temperature records and other kinds of temperature records are discussed.     

Synthesis of Various Types of Silver Nanoparticles Used as Physical Developing Nuclei in Photographic Science

Ag nanoparticles used as physical developing nuclei in photographic science were prepared by reduction method.The as-formed Ag nanoparticle colloid was characterized by UV-Vis absorption spectrum.Atomic Force Microscopy(AFM) and Charge Coupled Device(CCD) technique.It is found that the source of Ag ions,the addition of surfactant and polymer,all have great influence on the size,topography and catalytic activity of Ag nanoparticles.