基于船舶机舱监控网络的实时数据管理

介绍了基于船舶机舱监控网络的实时数据管理系统架构,论述了实时数据采集方法、存储策略设计思想、数据压缩要素和软件基本结构及主要模块的功能。     

Novel metasurface phase-modulation mechanism

The past few years have witnessed exciting develop-ments in non-Hermitian physics, showing unconventional phenomena and unique features associated with excep-ti...     

新型耐海水腐蚀低合金钢10CrCuSiV锈层分析研究报告

新型耐海水腐蚀低合金钢10CrCusiV,在大连海域全浸区挂片试验7a后的腐蚀率为0.23mm/a.通过金相、岩相、X射线衍射及扫描电镜、电子能谱等分析,都证明了10CrCuSiV钢的锈层致密,附着牢固,粘附性系数小;内锈层以Fe₃O₄为主,有良好保护性;而合金元素在蚀坑内的富集有效地抑制了局部腐蚀作用.     

Preliminary analysis of tritium fuel cycle in Z-pinch-driven fusion–fission hybrid reactor

Attaining tritium self-sufficiency is indispensable in a Z-pinch-driven fusion–fission hybrid reactor(ZFFR).In this paper,a conceptual design is presented in which the Z-FFR tritium cycle system was divided into eight subsystems.A theoretical analysis of tritium inventory based on the mean residence time was performed to quantitatively obtain the tritium distribution in each subsystem.Tritium self-sufficiency judgment criteria were established using a tritium mass flow analysis method.The dependency relationships between the burning rate,tritium breeding ratio,extraction efficiency,and tritium self-sufficiency were also specified for the steady state.     

Schrifttumsberichte

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城市轨道交通光伏发电系统的总体设计方案与并网模式分析

城市轨道交通已逐渐成为人们日常出行的重要交通工具,将光伏发电系统接入城市轨道交通直流牵引供电系统,不仅可以节能降耗,推动能源供应结构的转型,同时还能促进当地太阳能资源的利用和开发。首先概述了城市轨道交通光伏发电系统的总体设计方案,然后对光伏发电系统几种并网模式展开了讨论,最后对其今后的应用前景及发展方向进行了分析,以供该领域相关人员参考。     

焦炉机车液压油及密封件的选择与应用

水乙二醇具有良好的抗燃性、低温流动性以及黏温特性,稳定性好,使用寿命较长.济钢机械设备制造厂在为多家钢厂设计的焦炉机车中使用水乙二醇作为液压系统的液压油,使用效果良好,得到用户的肯定.丁腈橡胶耐油性极好,耐磨性较高,耐热性较好,其与水乙二醇有良好的相容性,可作为其密封材料.     

自动站气压记录异常原因的诊断分析

通过实例对莒县自动站气压记录异常的原因进行了分析.试验表明:采集器更换后对气压记录有0.5 hPa的影响;气压传感器在高温高湿环境下工作也会引起气压记录的异常.     

CRISPR-Cas Controls Cryptic Prophages

The bacterial archetypal adaptive immune system, CRISPR-Cas, is thought to be repressed in the best-studied bacterium, Escherichia coli K-12. We show here that the E. coli CRISPR-Cas system is active and serves to inhibit its nine defective (i.e., cryptic) prophages. Specifically, compared to the wild-type strain, reducing the amounts of specific interfering RNAs (crRNA) decreases growth by 40%, increases cell death by 700%, and prevents persister cell resuscitation. Similar results were obtained by inactivating CRISPR-Cas by deleting the entire 13 spacer region (CRISPR array); hence, CRISPR-Cas serves to inhibit the remaining deleterious effects of these cryptic prophages, most likely through CRISPR array-derived crRNA binding to cryptic prophage mRNA rather than through cleavage of cryptic prophage DNA, i.e., self-targeting. Consistently, four of the 13 E. coli spacers contain complementary regions to the mRNA sequences of seven cryptic prophages, and inactivation of CRISPR-Cas increases the level of mRNA for lysis protein YdfD of cryptic prophage Qin and lysis protein RzoD of cryptic prophage DLP-12. In addition, lysis is clearly seen via transmission electron microscopy when the whole CRISPR-Cas array is deleted, and eliminating spacer #12, which encodes crRNA with complementary regions for DLP-12 (including rzoD), Rac, Qin (including ydfD), and CP4-57 cryptic prophages, also results in growth inhibition and cell lysis. Therefore, we report the novel results that (i) CRISPR-Cas is active in E. coli and (ii) CRISPR-Cas is used to tame cryptic prophages, likely through RNAi, i.e., unlike with active lysogens, active CRISPR-Cas and cryptic prophages may stably co-exist.     

Genome-Wide Identification of the CER Gene Family and Significant Features in Climate Adaptation of Castanea mollissima

The plant cuticle is the outermost layer of the aerial organs and an important barrier against biotic and abiotic stresses. The climate varies greatly between the north and south of China, with large differences in temperature and humidity, but Chinese chestnut is found in both regions. This study investigated the relationship between the wax layer of chestnut leaves and environmental adaptation. Firstly, semi-thin sections were used to verify that there is a significant difference in the thickness of the epicuticular wax layer between wild chestnut leaves in northwest and southeast China. Secondly, a whole-genome selective sweep was used to resequence wild chestnut samples from two typical regional populations, and significant genetic divergence was identified between the two populations in the CmCER1-1, CmCER1-5 and CmCER3 genes. Thirty-four CER genes were identified in the whole chestnut genome, and a series of predictive analyses were performed on the identified CmCER genes. The expression patterns of CmCER genes were classified into three trends—upregulation, upregulation followed by downregulation and continuous downregulation—when chestnut seedlings were treated with drought stress. Analysis of cultivars from two resource beds in Beijing and Liyang showed that the wax layer of the northern variety was thicker than that of the southern variety. For the Y-2 (Castanea mollissima genome sequencing material) cultivar, there were significant differences in the expression of CmCER1-1, CmCER1-5 and CmCER3 between the southern variety and the northern one-year-grafted variety. Therefore, this study suggests that the CER family genes play a role in environmental adaptations in chestnut, laying the foundation for further exploration of CmCER genes. It also demonstrates the importance of studying the adaptation of Chinese chestnut wax biosynthesis to the southern and northern environments.