基于系统级封装(SiP)的信息安全芯片集成设计

为了解决信息安全系统中,逻辑运算芯片与存储器难以实现集成的问题,并更充分地满足信息安全系统高性能、低功耗、高可靠性的要求,本文提出了"基于SiP的信息安全芯片集成"的概念及具体设计方案.根据此方案设计实现了一款集成CPU、Flash存储器、密码算法芯片的小型信息安全系统的SiP成品实例,该成品的功能和性能验证结果均满足系统的目标需求,从而证实了该设计方案的可行性.该方案也符合今后电子技术和信息安全系统的主要发展方向.     

Potential advantages in combining smart and green infrastructure over silo approaches for future cities

Cities are incorporating smart and green infrastructure components in their urban design policies, adapting existing and new infrastructure systems to integrate technological advances to mitigate extreme weather due to climate change. Research has illustrated that smart green infrastructure (SGI) provides not only climate change resilience but also many health and wellbeing benefits that improve the quality of life of citizens. With the growing demand for smart technology, a series of problems and challenges, including governance, privacy, and security, must be addressed. This paper explores the potential to transition from grey, green, or smart silos to work with nature-based solutions and smart technology to help change cities to achieve considerable environmental and socio-economic benefits. The concepts of grey, green, and smart infrastructure are presented, and the needs, benefits, and applications are investigated. Moreover, the advantages of using integrated smart, green nature-based solutions are discussed. A comprehensive literature review is undertaken with keyword searches, including journal papers, stakeholder and case study reports, and local authority action plans. The methodology adopts multimethod qualitative information review, including literature, case studies, expert interviews, and documentary analysis. Published data and information are analysed to capture the key concepts in implementing SGI systems, such as storm-water control, flood and coastal defense, urban waste management, transportation, recreation, and asset management. The paper investigates the elimination of silo approaches and the alleviation of the destructions caused by extreme weather events using these interdependent SGI systems supported by novel data-driven platforms to provide nature-based solutions to boost the health and wellbeing of the residents.     

基于PCA-RA的滨海矿井水源识别技术研究

煤炭开采过程中矿井水害的发生,严重威胁着煤矿的安全生产,确定水源数量和类型对于矿井水害的防治具有重要意义。为了明确滨海煤矿矿井水补给来源的数量和类型,以龙口梁家煤矿为例,对矿区内不同水体(矿井水、第四系水和地表塌陷区积水)分别进行取样,并基于水化学和主成分分析-残差分析(PCA-RA)进行矿井水源识别。结果表明:梁家煤矿区内第四系水、地表塌陷区积水和矿井水中的主要化学组分含量差别较大,且受到了海水入侵作用的影响。就均值而言,矿井水中的阳阴离子质量浓度分别存在着ρ(Na⁺)>ρ(Ca²⁺)>ρ(Mg²⁺)>ρ(K⁺)和ρ(HCO₃^-)>ρ(Cl-)>ρ(SO₄²)>ρ(Cl-)的关系。不同水体中,Cl-和Na+均为优势阴、阳离子,水化学类型以Na-Cl型为主,并且3种水体之间存在着一定的水力联系。选取的水化学数据适合进行PCA,但仅根据特征值大于1或是累计方差贡献率大于85%来确定主成分的数量,并不能很好地表征原始数据的全部信息。基于水化学和PCA-RA方法,确定了梁家煤矿矿井水共有5个补给来源,即海水、富HCO3基岩水、塌陷区积水、混合水和第四系水。PCA-RA法能有效地处理和表征原始水质数据信息,可更加合理地确定矿井水的补给来源类型和数量。研究结果可为滨海煤矿区的水害防治提供科学依据。     

浆液法聚乙烯连续聚合过程中牌号过渡的优化

针对淤浆法乙烯聚合工艺串联生产过程,以切换时间最短和产生废料量最少为目标,对“反应釜-反应釜-造粒机”三者串联过程,建立了包括后处理过程在内的牌号切换优化模型.并利用迭代动态规划法对目标函数求解,得到各反应釜中聚合温度、氢气与乙烯单体浓度比(［H₂］/［C₂］)、共聚单体丁烯与乙烯单体浓度比(［C₄］/［C₂］)、催化剂进料流率4个操作变量和聚合物产品各性能指标的变化轨迹以及造粒机中聚合物熔融指数(MI)的变化轨迹.研究表明,聚合物的性能指标由反应过程和造粒过程共同决定.在目标函数中考虑造粒过程的影响后,能够有效抑制操作变量的剧烈变化,使其变化轨迹趋于平缓,保证切换生产过程的安全进行.     

中西方城市中产阶级化的对比研究

辨析了西方中产阶级化原理及特征,剖析了中国的中产阶级化过程,分析了中国中产阶级化产生的历史和社会背景,并对中西方城市的中产阶级社会化与空间化在表现形式与动力机制等方面做了对比研究,强调中国的中产阶级化与西方的中产阶级化过程尽管发展阶段与表现形式存在差异,但中西方城市中产阶级化具有异源同质性。指出随着国际化进程的推进,中国中产阶级化会越来越具有国际化特征,与西方的中产阶级化后续演替具有相当的类似性。     

Optimization of industrial structure： crux of the transition of mining cities

The rise and development of mining cities in our country take an extremely special status and play an important role in the national economy and social development. However, there are many problems in mining cities and their industrial structure. To realize the transition of mining cities, we must optimize the industrial structure. According to the theory of the optimization of industrial structure, the strategy is to organize regional enterprise groups, develop cluster economy, continuing industry and circular economy, and promote the rationalization of cities and regional industrial structure.     

The Interplay of Endothelial P2Y Receptors in Cardiovascular Health: From Vascular Physiology to Pathology

The endothelium plays a key role in blood vessel health. At the interface of the blood, it releases several mediators that regulate local processes that protect against the development of cardiovascular disease. In this interplay, there is increasing evidence for a role of extracellular nucleotides and endothelial purinergic P2Y receptors (P2Y-R) in vascular protection. Recent advances have revealed that endothelial P2Y₁-R and P2Y₂-R mediate nitric oxide-dependent vasorelaxation as well as endothelial cell proliferation and migration, which are processes involved in the regeneration of damaged endothelium. However, endothelial P2Y₂-R, and possibly P2Y₁-R, have also been reported to promote vascular inflammation and atheroma development in mouse models, with endothelial P2Y₂-R also being described as promoting vascular remodeling and neointimal hyperplasia. Interestingly, at the interface with lipid metabolism, P2Y₁₂-R has been found to trigger HDL transcytosis through endothelial cells, a process known to be protective against lipid deposition in the vascular wall. Better characterization of the role of purinergic P2Y-R and downstream signaling pathways in determination of the endothelial cell phenotype in healthy and pathological environments has clinical potential for the prevention and treatment of cardiovascular diseases.     

重要建筑物抗海啸强风的工程减灾措施探讨

对建筑物受海啸、强风作用的破坏特点与破坏机理进行了分析,提出对沿海地区建筑物选址应进行合理规划布局,强化主体结构设计,限制一般结构构件安全度等防海啸强风灾害的原则和工程减灾措施。研究还认为,对海啸、强风等作用下建筑结构的设计荷载和响应应作进一步的试验和理论分析,用科学的发展观来指导海岸工程的设计与建设。上述思想可为沿海地区大型工程项目建设和防灾减灾提供参考。     

基于幂律规则的滨海矿山巷道涌水混合比分析

滨海采矿引起的突涌水灾害对矿山的安全生产构成了极大威胁,计算巷道涌水的混合比,进一步分析其演化规律对于突涌水事故的防治具有重要意义.将幂律规则应用于三山岛金矿巷道涌水混合比数据的统计分析中,根据2个已有的混合比研究结果,采用概率密度函数p(S)对相邻2个监测周期的海水比例波动事件进行了拟合,拟合的相关系数分别达到0.9...     

北海市偏酸性地下水pH值的特点及其影响因素简析

广西北海市滨海平原分布有低矿化度(小于200mg/L)的潜水和承压水,天然状态下地下水的pH值为3.33~7.0,平均值为5.12,其中潜水3.67~7.0,平均值5.17;承压水3.33~6.97,平均值5.07。地下水的pH值没有显著的上升或者下降,部分监测孔有一定的波动,一般在丰水期要略高于枯水期。总体上,雨水的pH值高于潜水,潜水的pH值又略高于承压水,自内陆地区向海边,地下水的pH值呈略减小趋势。pH值较低的大气降水入渗补给和具有多层结构的越流含水系统,有利于这一地区偏酸性地下水的分布。