Investigation was carried out to assess the effect of cement dust deposition on the physico-chemical properties of soil near some cement plants in Jaintia Hills, Meghalaya. Soil samples were collected and analysed and compared with the control site. Comparison of various soil physico-chemical parameters revealed that cement dust emanating from cement plants has changed the soil quality in the surrounding areas of cement plants. The normal soil pH in the area is generally acidic. However, due to the continuous deposition of cement dust soil pH was found slightly alkaline near the cement plants. The higher values of soil parameters such as electrical conductivity and bulk density were also noticed near the cement plants. However, lower values of water holding capacity, soil moisture content, soil organic carbon and total nitrogen content were found compared to the control sites. The effect of cement dust deposition on soil is more in areas nearer to the cement plants. At present the changes may not be so serious but if this trend continues, soil properties of a vast area around the cement plants are likely to change leading to multiple effects on flora, fauna and socio-economy of the area.
Lukha River (Wah Lukha) is one of the major rivers of Meghalaya situated in the southern part of East Jaintia Hills District. Activities such as mining of coal and limestone, manufacturing of cement, deforestation etc. have been taking place in the catchment area of the river leading to changes in water quality. This is evident from the deep blue appearance of water of Lukha River during winter months for the last 7-8 years. Till date no convincing and conclusive reason has been given for this annual change in physical appearance. To get insight, we studied the physico-chemical water quality parameters of this river in different seasons and found that the water quality has started deteriorating due to activities occurring in the catchment area. Based on Canadian Council of Ministers of the Environment-Water Quality Index (CCME-WQI) the water of the river at some locations was found of 'poor' quality.
Resumo-Neste trabalho, apresentamos técnicas iterativas de seleção de pontos de acesso (PAs) (SPA), pré-codificação linear minimum mean-square error (MMSE) e alocação de potência para sistemas de múltiplas antenas livres de células (cell-free). Consideramos o downlink com usuários com uma antena e PAs com múltiplas antenas. Desenvolvemos uma estratégia, onde usamos um pré-codificador MMSE junto com alocação de potência uniforme ou ótima que maximiza a mínima taxa por usuário. Resultados mostram que a técnica proposta supera os précodificadores existentes, Conjugate Beamforming (CB) e Zero-Forcing (ZF) e que o desempenho se mantém excelente com SPA, na presença de conhecimento perfeito e imperfeito de canal. Palavras-Chave-sistemas de múltiplas antenas livres de células, pré-codificação MMSE, alocação de potência, seleção de PA, sistemas de antenas distribuídas.
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