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Articles by M. Ihsan
Total Records ( 2 ) for M. Ihsan
  I.P. Handayani , P. Prawito and M. Ihsan
  Imperata grassland is recognized as environmental threats causing low land productivity. This has increased the need to assess the effect of grassland conversion to agricultural fields on soil. Undisturbed and disturbed soil samples were collected from Bengkulu Province, Sumatra, Indonesia. We used five different land management practices such as Imperata cylindrica dominated grassland as a reference, cassava field, banana field, legume field and agroforestry. Result shows that 6-year of cassava cultivation decreased 35% of soil water content at field capacity, 23% of water holding capacity, 11% of porosity, 13% of organic C and microbial biomass C, 32% of inorganic N and 10% of mineralizable C. Conversion to banana field only lowered C organic about 6% and soil microbial biomass C up to 8%. Conversion to legume fields and agroforestry significantly increased all the soil properties tested. Agroforestry system has maintained higher soil C and N levels than the other fields. On average, degradation index in cassava field was 11%. The aggradation index has increased from banana field (14%), agroforestry system (37%) and legume field (38%). In conclusion, conversion of Imperata grassland to conservative agricultural land is considered one way to improve soil ecosystem.
  B. Bakri , M. Akbar , S. Pallu , R. Lopa , M. Ihsan and Y. Arai
  As maritime state, most of Indonesian reside in coastal areas or estuaries, leading sanitation and water supply a major concern of the people. The use of groundwater with considerably limited amount is more limited due to seawater intrusions. On the other side, surplus of freshwater from upstream is very abundant near the estuaries. However, morphological condition of river downstream or in estuaries with huge dimension and depth causes expensive cost in order to utilize freshwater in estuaries. One of the solutions to utilize water downstream or near estuaries as raw water for clean water is to build free intakes around river estuaries. However, as the utilizing proceeding it is found a problem that intake capacity is far below their design capacity. The research is an experimental research conducted in the laboratory which aimed to investigate the relationship of flow velocity distribution on no free intake and with free intake condition and its influence to the capacity of free intake structures. The result shows that either on no free intake and with free intake condition minimum velocity occurs around channel bed and increasing upright and decreasing again when approaching surface of the channel. The positioning of intake pipe is highly influencing intake capacity. Maximum condition is achieved when intake pipe is positioned on channel bed and near channel surface while minimum condition is achieved when pipe is around middle part of the channel.
 
 
 
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