长期演进系统基于加权平均时延的下行资源调度

针对长期演进（LTE）移动通信系统下行链路传输中多用户的实时（RT）与非实时（NRT）业务传输性能需求问题，提出一种基于用户加权平均时延的改进型的最大加权延时优先（MLWDF）资源调度算法。该算法在考虑信道感知与用户服务质量（QoS）感知的基础上引入反映用户缓冲区状态的加权平均时延因子，该因子通过用户缓冲区中待传输数据与已发送数据的平均时延均衡得到，使具有较大时延和业务量的实时业务优先调度，提升了用户的性能体验。理论分析与链路仿真表明，提出算法在保证各业务时延及公平性的基础上，提升了实时业务的QoS性能，在用户数量达到50的条件下，对比MLWDF算法实时业务的丢包率降低了53.2%，其用户平均吞吐量提升了44.7%，虽牺牲了非实时业务的吞吐量，但仍优于VT-MLWDF算法。实验结果表明，所提算法在多用户多业务传输条件下提升了实时业务的传输性能，并在QoS性能上明显优于对比算法。     

Porous ceramics with tailored pore size and morphology as substrates for coral larval settlement

The growing demand for stony corals as ornamental aquarium animals requires defined aquacultural breeding strategies. For the sexual propagation of corals, material substrates are needed, that attract larvae and support their settlement and development. In this study, five types of highly porous ceramic materials were developed following the example of coral skeleton. The applicability of these settlement substrates was tested using larvae of the stony coral Pocillopora damicornis. Partial sintering of pressed clay pellets, freeze casting of clay and alumina-mullite based slurries and direct foaming of high alkane phase emulsified suspensions (HAPES) using alumina were employed. By the addition of mm-sized spherical polystyrene beads as sacrificial templates during freeze casting (alumina-mullite), superficial pores in the size of the larvae were created. The inorganic substrates featured open porosities between 35% (pressed clay) and 83% (foamed alumina), pore sizes ranging from nm to mm-scale and pore morphologies dominated by interparticle porosity (pressed), lamellar pores (freeze casting) and cellular pore types (direct foaming). The ceramic substrates were incubated in artificial sea water for 3 months to induce necessary biofilm formation and algae growth. Afterwards, individual substrates were exposed to 5 coral larvae, and their settlement behavior was monitored over 14 days. At the end of this period, all ceramic materials were successfully accepted as settlement substrates, with a mean settlement rate of 46.2%, and no significant differences between the substrate types. On samples with large surface superficial pores, a significantly reduced survival of settled larvae (79%) compared to the other porous materials (93–98%) was determined, suggesting a non-ideal surface topography. While alumina foam samples (HAPES) exhibit the most promising results in terms of settlement and survival of larvae, clay-based substrates provide a more economic solution for the sexual propagation of corals in aquaculture.     

如何根据ASME规范产品RT标记确定焊接接头系数

用焊接方法建造的ASME规范产品,其焊接接头系数与焊接接头的无损检测程度密切相关。在ASME规范压力容器卷中明确规定了焊接接头系数选取规则,但在一些较为复杂的情况下却很容易引起误解而选错系数。通过详细分析ASME规范中关于RT标记的要求和应用,探讨在实际应用中如何根据产品的RT标记来确定焊接接头系数。     

Effects of porosity,dry unit weight,cement content and void/cement ratio on unconfined compressive strength of roof tile waste-silty soil mixtures

One of the conventional ways to improve the mechanical behavior of soils is to mix them with cementing agents such as cement, lime and fly ash. Recently, introduction to alternative materials or sub-products that can be adopted to improve the soil strength is of paramount importance. Therefore, the present study aims to investigate the effects of porosity (η), dry unit weight (γ_d) of molding, cement content (C) and porosity/volumetric cement content ratio (η/C_iv) or void/cement ratio on the unconfined compressive strength (q_u or UCS) of silty soil–roof tile waste (RT) mixtures. Soil samples are molded into four different dry unit weights (i.e. 13 kN/m³, 13.67 kN/m³, 14.33 kN/m³ and 15 kN/m³) using 3%, 6% and 9% cement and 5%, 15% and 30% RT. The results show that with the addition of cement, the strength of the RT–soil mixtures increases in a linear manner. On the other hand, the addition of RT decreases q_u of the samples at a constant percentage of cement, and the decrease in porosity can increase q_u. A dosage equation is derived from the experimental data using the porosity/volumetric cement content ratio (η/C_iv) where the control variables are the moisture content, crushed tile content, cement content and porosity.     

基于RT Thread的便携式健康监测仪的设计

随着社会的发展、生活水平的不断提高,人们对自身健康问题更为重视,而传统的健康监测设备缺乏有效的健康管理功能。为此,介绍了一种便携式健康监测仪的软硬件设计,该设计采用基于Cortex M4内核的32位低功耗处理器作为系统的控制核心,采用RT Thread实时操作系统作为系统的软件平台。系统可实现心率测量、额温测量、计步与能耗监测、健康任务管理等功能。进而通过健康检测—干预方案生成—干预方案执行监测—干预效果评估（健康再检测）的闭环管理模式,不断改善和促进健康。     

Construction of the mutant strain in Aspergillus oryzae 3.042 for abundant proteinase production by the N+ ion implantation mutagenesis

Because of secreting large amounts of enzymes, Aspergillus oryzae was widely used in the fermentation of soy sauce in many Asian countries. Here, N⁺ ion implantation mutagenesis was applied to improve the ability of A. oryzae to secrete acid protease. Several mutants were screened using three kinds of plates (Casein medium, Czapek’s medium and carboxymethyl cellulose medium agar plates). Compared with the other mutants, the mutant A100‐8 could secrete the most protease. Acid protease activity of A100‐8 was enhanced about 44.1% at 36 h by koji fermentation test. In addition, A100‐8 was stable by periodically subculturing and maintaining on the agar slant. The mRNA expression levels of two kinds of acid protease (serine carboxypeptidase and aspartyl protease) were measured by RT‐PCR at different periods. Serine carboxypeptidase and some kinds of aspartyl protease of A100‐8 were significantly (P < 0.01) expressed higher than the control at all times.     

基于ETS系统的航空数据采集系统及协议解析

目前航空飞行过程中对于飞行数据的采集方法比较单一,大多是使用传统DAQ(data acquisition)数据采集卡进行采集,由于操作系统的延迟和多任务的执行可能导致采集任务的优先级得不到保证,此种方法难以保证系统运行效率和数据准确性.针对这种现状,设计了基于Real-Time模块和ETS(embedded tool ...     

Assessment of thermal aging embrittlement in a cast stainless steel valve and its effect on the structural integrity

This paper analyzes the thermal aging embrittlement occurred in a cast stainless steel valve, which is part of the reactor water clean-up (RWCU) system of a Spanish boiling water reactor (BWR) nuclear power plant. The aim is to estimate the current and future state of the material and the corresponding structural integrity of the valve. Given that there is no data available for the experimental characterization of the material, the evolution of the mechanical properties (fracture toughness, yield stress, flow stress and Ramberg-Osgood parameters) has been estimated using the ANL procedure.With the obtained estimations, the critical crack size has been calculated using the European procedure FITNET FFS and the ASME Code.This analysis considers not only the evolution of the mechanical properties up to now but also its future evolution in case there is a life extension of the plant until year 2029.     

核电管道承插焊口的射线透照工艺

承插焊接的连接形式主要用于小口径阀和管道、管件和管道焊接，其结构形式为管道的插入角接型式，接头属于角接接头，由于其厚度的不同和其结构的特殊性，和厚度差变化范围较大，此种接头的内部检验给射线检测带来了一定难度泰文针对承插焊口的拍片过程及其特点，提出了采用自设自装的一种可提高插套拍片效率、准确度的焦距堆直器，在检测过程中，采用背屏及滤光板进行散射线控制，结合透照厚度的计算确定检测工艺参数的透照检测工艺参数，包括曝光时间，曝光，焦距以及胶片尺寸的大小。此种工艺的提出，可适应核电各系统的插套的检测，检测技术及工艺的应用在其他工程建设方面也有较强的借鉴推动作用。     

Evaluation of aJile aJ-80 Real-Time embedded platform for RT-Java parameters

The purpose of this project is the evaluation of Real-Time (RT) features of an aJ-80 embedded JAVA processor from aJile company. This product combines qualities of of high level programming language and RT feature in area of embedded applications. For any safety and critical embedded application is detailed specification of RT features very important. For this reason we have developed task examples which examine RT features of this processor and provide relevant results for evaluation of RT features. Implementation of the program code that enables digital filtration on aJ-80 processor is demonstrated on several examples. To ensure a correct processing of digital filtration we need a fastest calculation along with the greatest accuracy. Next, it is almost always necessary for the results to be available after the same time from the sample upload. These matters determine the digital filtration as a RT problem which is suitable for testing of the processor aJ-80 and its RT features. We also discuss results and provide their evaluation. Based on the evaluation, the performance of the hardware program of the processor aJ-80 is very effective. In this respect, the product is recommended to use in many hard RT areas.