Judul: Analisis Karakteristik Parameter-Parameter Atmospheric Boundary Layer dengan Data Radiosonde (Studi Kasus : Kota Serang)
Abstrak: Atmospheric Boundary Layer as the air layer directly affected by the earth’s surface where the surface effects (friction, heating and cooling) felt directly on a time scale less than a day. Case study in this paper is Serang. The data used is the radiosonde data. In describing the atmospheric boundary layer requires a parameter, such as the virtual potential temperature, mixing ratio, and wind speed. Sketch the pattern of vertical virtual potential temperature continued to rise during the day on SL layer, then decreased and more homogeneous in the ML layer, increased in tiitk CI with the result that CI is higher than the night, early morning, or late afternoon. Vertical profiles of Mixing ratio, maximum humidity during the day will continue to decline at the surface and in the lining of SL, when entering the ML layer, as the turbulence becomes homogeneous, and when it reaches the CI. Wind speeds in Region Attacking at night more than early morning (01.00) morning (at 07.00) and afternoon (13:00), it is because there is a strong influence of intense turbulence during the day.
Keyword: 

Judul: Dinamika Lapisan Perbatas pada Dua Wilayah dengan Karakter Berbeda (Studi Kasus: Bandara Soekarno Hatta dan Situ Gede Dramaga Bogor)
Abstrak: Atmospheric boundary layer (ABL) was the layer which affected by the surface's layer underneath. Different characteristics on the surface will affect the dynamics in boundary layer. This study aims to determine the height of ABL which was influenced by differences of surface characteristics at different times and places. This study conducted in two different surface characteristics of area, these are Bandara Soekarno Hatta as urban area and Situ Gede Dramaga Bogor as agricultural area. Meteorological parameters data from radiosonde were analyzed with the approachment from vertical profiles of temperature, humidity, and wind speed also atmospheric stability condition. The average height of ABL in Bandara Soekarno Hatta was higher than Situ Gede Dramaga Bogor, and that was because the differences of surface characteristics, moisture content and temperature between air. Atmospheric conditions at both areas tend to be stable in the morning and evening then unstable during the day. Based on the pattern of vertical profiles ABL parameter, the value of the temperature near the surface was greater at Bandara Soekarno Hatta compared to Situ Gede Dramaga Bogor and inversely proportional to the value of the humidity. Fluctuation for temperature and moisture in each areas had consistency meanwhile the wind speed in both areas had fluctuated. That shows the moisture content and the difference of surface characteristics affect the value of the temperature, humidity, and wind speed.
Keyword: atmospheric boundary layer, humidity, surface characteristics, temperature, wind speed

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
Keyword: