3.5代通信中链路自适应技术的研究和仿真

3.5代移动通信中的链路自适应技术使用自适应调制编码和快速混合重传技术替代了3代中使用的功率控制技术。仿真结果比较了这两种新技术与功率控制技术的性能,证明了这两个新技术显著地提高了网络平均的吞吐量。     

出租车拼车计费系统的设计

出租车拼车计费系统硬件设计采用单片机PK10N512VLL10为主控芯片,TPC7062KW组态触摸屏为监控操作界面,显示部分为64*16点阵;在软件上将乘车状态划分为单乘状态和拼车状态,同时根据当地物价水平设定计费方案,计算出不同乘客的车费,车内车费的显示采用实时刷新的方法;该系统样机已经成型,经测试操作简单、稳定且成本较低。     

基于速龙码的WSNs传输功率控制重编程协议

为了降低节点能耗,提高能量的利用率,提出了一种高效节能的基于速龙码（ RC）的传输功率控制（ RC-TPC）重编程协议。该协议分两个阶段完成数据传输,第一阶段各个节点更新自己的位置信息,形成最优化的拓扑结构。进入第二阶段后,根据优化的拓扑结构通过调整发送节点的传输功率和中继节点的累计选择次数,Sink节点选择适当的中继节点,使中继节点的传输功率和RC的开销达到最优化。此外,RC的编码方式使传输数据包发生的错误概率更小,减少了重编程过程中的冗余以保证网络负载的均匀分布,有效地实现了高效节能,从而提高整个网络的生存周期。理论分析与实验结果表明：与MNP协议和ATPC协议相比,RC-TPC协议用于传输的平均能量消耗降低17.2%。     

Antioxidant and α-glucosidase inhibitory activities of eight neglected fruit extracts and UHPLC-MS/MS profile of the active extracts

The 70% ethanolic extracts from eight neglected fruits; Muntingia calabura, Leucaena leucocephala, Spondias dulcis, Syzygium jambos, Mangifera caesia, Ardisia elliptica, Cynometra cauliflora and Ficus auriculata were evaluated for their 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging, α-glucosidase inhibitory activities as well as total phenolic content. The results of this study revealed that M. caesia fruit extract demonstrated the most potent radical scavenging activity. Among the fruits examined for α-glucosidase inhibitory activity, M. calabura and F. auriculata exhibited strong activity with no significant difference. The Pearson correlation indicated that the activities of M. caesia and F. auriculata contributed by phenolic compounds. A total of 65 metabolites were tentatively identified by using ultra-high-performance liquid chromatography tandem mass spectrometry (UHLPC-MS/MS). These findings suggested that the possible application of M. caesia and F. auriculata as a functional food with antioxidant and α-glucosidase inhibitory properties.     

Decalcification of activated paper sludge – Fly ash-Portland cement blended pastes in pure water

Decalcification in pure water of ternary Portland cement (TPC) pastes, containing thermally activated paper sludge and fly ash, has been evaluated from the leaching of Ca²⁺ in pure water at the temperature of 20 °C during 90 days. Monitoring of calcium loss showed that the leaching kinetics are controlled by diffusion. The degradation of the material over time is estimated from the calcium effective diffusivity. A similar study of plain ordinary Portland cement (OPC) pastes was carried out for comparison. The results showed lower effective diffusion coefficients of calcium in the case of the TPC pastes. This behaviour is related to its microstructure, which is denser than that of OPC as a result of the pozzolanic activity of both additions.     

Solvent and Extraction Conditions Control the Assayable Phenolic Content and Antioxidant Activities of Seeds of Black Beans,Canola and Millet

The effects of extraction solvent and conditions on the total phenolic content (TPC) and antioxidant activity of black beans, canola and foxtail millet were investigated. The antioxidant activity was assayed using 2,2‐diphenyl‐1‐picrylhydrazyl radical scavenging activity (DRSA) and oxygen radical absorbance capacity (ORAC). Four solvent systems, namely 70 % acetone, 80 % ethanol, 80 % methanol and a mixture of acetone/methanol/water (7:7:6, v/v/v) were used. The extraction methods adopted in this study included refluxing, homogenization, cold extraction and sonication. The TPC as measured using the Folin Ciocalteu's method were 12.35–28.39, 2.43–16.73, and 1.78–5.06 µmol catechin equivalents/g dry matter (dm) for canola, black beans and foxtail millet, respectively. Aqueous acetone afforded the highest TPC for black beans and canola. Within the same solvent system used, the TPC, DRSA and ORAC obtained from different extraction techniques differed for black beans, canola and foxtail millet. The results demonstrated that the solvent system as well as method influenced the extraction of phenolic compounds and their antioxidant activities, depending on the type of matrix in which phenolics were embedded.     

TPC单元及其在步进电机调速中的应用

介绍瑞萨公司的16位单片机H8／3062F中可编程定时式样控制器TPC的结构功能,以及如何利用TPC实现对异步电机的启动和加减速控制的硬件结构原理和软件程序设计。     

Evaluation of the antioxidant and antiproliferative activities of extracted saponins and flavonols from germinated black beans (Phaseolus vulgaris L.)

Flavonoids and saponins from common beans have been widely studied due to their bioactivity. This research evaluated the effect of germination of black beans (Phaseolus vulgaris L.) on the antioxidant capacity and antiproliferative activity against cancer cell lines of saponins and flavonoids extracted from seed coats, cotyledons and sprouts. Principal component analysis was performed to achieve punctual associations between the black bean saponins and flavonoids concentrations to the antioxidant capacity and the antiproliferative activities. Total phenolic content and antioxidant capacity of extracts were higher when obtained from seed coats, mainly from the 3rd germination day. The extracts obtained from seed coats after 3 and 5 germination days inhibited all cancer cell lines proliferation with no cytotoxicity against control cells. Genistein was related with the activity against mammary cancer cells but flavonols and group B saponins were more related with hepatic and colon cancers. Non-glycosilated flavonols were related with antioxidant capacity.     

基于IP core的3/4 TPC编解码器的设计

基于XILINX公司的TPC IP core设计了码率为3/4的TPC编解码器。此3/4Turbo乘积码(Turbo productcode,TPC)编码是在码率为(64,57)×(64,57)的二维TPC编码的基础上截短得到的。该编码采用IEEE802.16和IEEE802.16a标准中规定的生成多项式。设计中采用了周期为220-1的二进制伪随机序列作为信源,利用AWGN IP core生成数字高斯白噪声,对3/4TPC的性能进行了测试。采用BPSK调制在Eb/N0为4.0dB时,测得的信道的误码率为2×10-6,信息速率可以达到49Mbps,与Matlab的仿真结果相比大约有0.2dB左右的误差。所有程序都在一片FPGA VirtexII2000中完成。