人防工程施工问题及注意事项

人防工程是平战结合的建筑,其特殊性尤为重要,施工中的技术要求较高。文章通过对地下室人防工程的防护密闭部位、门框墙、防水及各种配置箱体等在施工中容易出现的问题进行归纳,提出了人防工程施工过程中的注意事项。     

防空导弹装备光学伪装效果的集对评估模型

为解决传统光学伪装效果评估指标考虑不全的问题,从敌方侦察能力、装备隐真能力、装备示假能力以及环境四个方面建立了装备光学伪装效果评估指标体系。首先,采用施密特正交马田系统(MTGS)计算指标的权重,不仅考虑了评估者的知识及经验偏好,同时也消除了指标间的信息交互,权重的确定更加合理。然后建立了基于集对分析的评估模型。最后,通过实例验证了评估模型的可靠性。结果表明该模型在装备光学伪装效果评估及伪装器材选取方面具有一定的应用价值。     

滨海金矿涌水危险评价及涌水量混沌预测研究

针对海底金矿涌水危险评价过程中的不确定性及随机性问题，选择工程地质及水文地质中涉及的10个重要因素构建评价指标体系，建立起涌水危险评价的云模型。基于评价结果，对危险区域的涌水量时间序列进行相空间重构，通过G-P算法及自相关法获得了重构相空间参数；分析了涌水量变化的相点距离演变规律，建立了涌水安全预警机制。结合混沌相空间重构，建立了涌水量预测的RBF神经网络模型。研究表明：涌水危险性的云模型评价结果准确可靠；相空间重构揭示了系统的混沌特性，最邻近相点演化将涌水量的内在细微变化特征放大，为涌水安全预警机制的建立提供了依据；混沌RBF神经网络能够实现涌水量的短期精确预测，为井下安全开采提供了技术保障。     

无线网络的中间人攻击及防御方法

如今WiFi、蜂窝移动数据等各种无线网络已经得到广泛的普及和应用，无线网络的安全问题愈加重要。目前，针对无线网络进行中间人攻击已大量存在，也是一种具有较大威胁的攻击手段。本文将从技术原理、攻击方式、防御方法等角度对无线网络的中间人攻击进行论述。     

Uptake of Radionuclides onto Suspended Particulate Matter in Coastal Water

Distribution coefficients K _ds of several radionuclides on suspended particulate matter (SPM) have been determined with laboratory batch experiments using samples collected in the Kinki district, Japan. Most SPM in coastal water was retained on the initial filter of four sequential filtering stages (20, 5, 1 and 0.45 μm pore size), maximum K _d also being found for the SPM retained in this first stage. When the filtrations were not performed in series, however, but were conducted from the same tracer solution in parallel, the K _d values were identical for the smaller filter sizes (5, 1 and 0.45 μm) and were greater, by ca. 150% than those derived from the 20 μm filter. The degree of association of the radionuclides with SPM was ⁸⁵Sr<¹³⁷Cs<⁶⁵Zn<⁵⁴Mn<⁶⁰Co. The particulate radioactivity fraction of the SPM in coastal water was estimated at most 0.1 for radionuclides with K _d of ca. 5 X 10⁴ ml/g, i.e. which are highly associated with the SPM (2 mg/l). The scavenging effect by SPM seemed to be, however, considerable, the settling velocity being estimated at ca. 25 cm/day for particles of the Stoke's diameter of 30 μm.     

Reactive Oxygen and Nitrogen Species in Defense/Stress Responses Activated by Chitosan in Sycamore Cultured Cells

Chitosan (CHT) is a non-toxic and inexpensive compound obtained by deacetylation of chitin, the main component of the exoskeleton of arthropods as well as of the cell walls of many fungi. In agriculture CHT is used to control numerous diseases on various horticultural commodities but, although different mechanisms have been proposed, the exact mode of action of CHT is still unknown. In sycamore (Acer pseudoplatanus L.) cultured cells, CHT induces a set of defense/stress responses that includes production of H₂O₂ and nitric oxide (NO). We investigated the possible signaling role of these reactive molecules in some CHT-induced responses by means of inhibitors of production and/or scavengers. The results show that both reactive nitrogen and oxygen species are not only a mere symptom of stress conditions but are involved in the responses induced by CHT in sycamore cells. In particular, NO appears to be involved in a cell death form induced by CHT that shows apoptotic features like DNA fragmentation, increase in caspase-3-like activity and release of cytochrome c from the mitochondrion. On the contrary, reactive oxygen species (ROS) appear involved in a cell death form induced by CHT that does not show these apoptotic features but presents increase in lipid peroxidation.     

Allyl Isothiocyanate Inhibits Actin-Dependent Intracellular Transport in Arabidopsis thaliana

Volatile allyl isothiocyanate (AITC) derives from the biodegradation of the glucosinolate sinigrin and has been associated with growth inhibition in several plants, including the model plant Arabidopsis thaliana. However, the underlying cellular mechanisms of this feature remain scarcely investigated in plants. In this study, we present evidence of an AITC-induced inhibition of actin-dependent intracellular transport in A. thaliana. A transgenic line of A. thaliana expressing yellow fluorescent protein (YFP)-tagged actin filaments was used to show attenuation of actin filament movement by AITC. This appeared gradually in a time- and dose-dependent manner and resulted in actin filaments appearing close to static. Further, we employed four transgenic lines with YFP-fusion proteins labeling the Golgi apparatus, endoplasmic reticulum (ER), vacuoles and peroxisomes to demonstrate an AITC-induced inhibition of actin-dependent intracellular transport of or, in these structures, consistent with the decline in actin filament movement. Furthermore, the morphologies of actin filaments, ER and vacuoles appeared aberrant following AITC-exposure. However, AITC-treated seedlings of all transgenic lines tested displayed morphologies and intracellular movements similar to that of the corresponding untreated and control-treated plants, following overnight incubation in an AITC-absent environment, indicating that AITC-induced decline in actin-related movements is a reversible process. These findings provide novel insights into the cellular events in plant cells following exposure to AITC, which may further expose clues to the physiological significance of the glucosinolate-myrosinase system.     

防护工程柴油电站消烟降温技术研究

针对防护工程对柴油发电机尾气排放的特殊要求,研制柴油电站废气余热发电装置。介绍柴油电站尾气降温技术的发展现状;阐述柴油电站废气余热发电装置和核心系统——温差发电余热系统和降温除尘技术的设计方案;比选静电除尘技术及DPF(diesel particulate filter)消烟除尘技术方案优势,给出基于DPF消烟除尘技术的柴油电站废气余热发电装置效果图。