From 20 January to 20 July 2023, a study was carried out on the Lobé Creek, a waterway subject to considerable natural and man-made pressures, with a negative impact on its biodiversity and habitats. The aim was ...From 20 January to 20 July 2023, a study was carried out on the Lobé Creek, a waterway subject to considerable natural and man-made pressures, with a negative impact on its biodiversity and habitats. The aim was to evaluate the growth rate of invasive aquatic macrophytes and their contribution to the use of organic fertilisers: a case of Eicchornia crassipes (Mart.) Solms, 1883 in the Lobé Creek (Littoral-Cameroon) with a view to its appropriate use in agronomy. The specific objective was to examine the impact of anthropogenic actions on Lobé Creek, characterise physico-chemical environment of the study area, and evaluate the growth rate of E. crassipes and its chemical composition with a view to producing an organic biofertiliser. The results show that E. crassipes represents a considerable threat to the populations of these localities. As for the physico-chemical parameters, the temperature values vary from 24 ± 1.41˚C to 26.5 ± 1.13˚C;pH from 6.3 ± 0.1 to 7.2 ± 0.07;conductivity and dissolved oxygen vary respectively from 40.7 ± 1.83 µS/cm to 19.6 ± 3.11 µS/cm and from 7.3 ± 0.14 mg/l to 5.8 ± 1.55 mg/l. Its average growth rate varies from 0.69 feet/day to 0.63 feet/day. With regard to the nitrogen, phosphorus and potassium content of water hyacinth plants, the results show that the average total nitrogen content ranges from 6.11 ± 1.59 g/kg to 5.2 ± 2.03 g/kg;total phosphorus, from 0.52 ± 0.54 g/kg to 0.88 ± 0.38 g/kg;and potassium, from 1.43 ± 0.45 g/kg to 2.61 ± 0.89 g/kg.展开更多
概述了LOBS-HC(labeled optical burst switch with home circuits)技术及其网络的结构,及其能提供带宽保证并提高波长带宽利用率的特性。基于Visual C++设计并实现了LOBS-HC网络仿真平台,包括网络业务流的产生和汇聚、突发包的组装、HC...概述了LOBS-HC(labeled optical burst switch with home circuits)技术及其网络的结构,及其能提供带宽保证并提高波长带宽利用率的特性。基于Visual C++设计并实现了LOBS-HC网络仿真平台,包括网络业务流的产生和汇聚、突发包的组装、HC(home circuit)逻辑链路的建立和撤销过程的模拟。通过吞吐率、网络延时、波长利用率等性能参数对LOBS-HC网络进行评测。仿真结果表明,LOBS-HC能在提供与OCS相同带宽保证的同时,获得更好的网络带宽利用率。展开更多
文摘From 20 January to 20 July 2023, a study was carried out on the Lobé Creek, a waterway subject to considerable natural and man-made pressures, with a negative impact on its biodiversity and habitats. The aim was to evaluate the growth rate of invasive aquatic macrophytes and their contribution to the use of organic fertilisers: a case of Eicchornia crassipes (Mart.) Solms, 1883 in the Lobé Creek (Littoral-Cameroon) with a view to its appropriate use in agronomy. The specific objective was to examine the impact of anthropogenic actions on Lobé Creek, characterise physico-chemical environment of the study area, and evaluate the growth rate of E. crassipes and its chemical composition with a view to producing an organic biofertiliser. The results show that E. crassipes represents a considerable threat to the populations of these localities. As for the physico-chemical parameters, the temperature values vary from 24 ± 1.41˚C to 26.5 ± 1.13˚C;pH from 6.3 ± 0.1 to 7.2 ± 0.07;conductivity and dissolved oxygen vary respectively from 40.7 ± 1.83 µS/cm to 19.6 ± 3.11 µS/cm and from 7.3 ± 0.14 mg/l to 5.8 ± 1.55 mg/l. Its average growth rate varies from 0.69 feet/day to 0.63 feet/day. With regard to the nitrogen, phosphorus and potassium content of water hyacinth plants, the results show that the average total nitrogen content ranges from 6.11 ± 1.59 g/kg to 5.2 ± 2.03 g/kg;total phosphorus, from 0.52 ± 0.54 g/kg to 0.88 ± 0.38 g/kg;and potassium, from 1.43 ± 0.45 g/kg to 2.61 ± 0.89 g/kg.
文摘光突发交换技术和 MPL S的迅速发展产生了一种更加灵活、紧凑的 IP/ DWDM集成方案 L OBS。它综合了光路交换和光分组交换的优点及最先进的 MPL S的强大控制能力 ,是下一代因特网的理想光交换方案 ,并且为光分组交换的实现奠定了基础。文中在全面介绍 L OBS交换网络结构和控制协议的基础上 ,分析了 L OBS流量工程和 Qo S机制 ,最后初步讨论了 L
文摘概述了LOBS-HC(labeled optical burst switch with home circuits)技术及其网络的结构,及其能提供带宽保证并提高波长带宽利用率的特性。基于Visual C++设计并实现了LOBS-HC网络仿真平台,包括网络业务流的产生和汇聚、突发包的组装、HC(home circuit)逻辑链路的建立和撤销过程的模拟。通过吞吐率、网络延时、波长利用率等性能参数对LOBS-HC网络进行评测。仿真结果表明,LOBS-HC能在提供与OCS相同带宽保证的同时,获得更好的网络带宽利用率。
