信息摆渡系统解决物理隔离下的信息交互问题

物理隔离是很多电子政务系统建设的先决条件,如何在物理隔离条件下建设基于数据库的信息应用系统是一个难题.把电子政务系统网络分成政务外网、摆渡网、政务内网,利用网络电子开关进行网络连接切换,利用信息摆渡系统进行政务内网、政务外网间数据的同步处理是解决物理隔离条件下数据库交互应用的一种有效的方法.从网络及系统架构、网络开关、对信息摆渡系统信息处理过程、与应用系统的配合以及安全措施等方面全面的对信息摆渡系统建设进行阐述.     

基于异步通信协议的地理空间信息服务访问机制

目前访问涉密网中地理空间信息服务的传统做法,是使用网闸、防火墙等安全手段实现公网与涉密网的通讯连接。但由于涉密网与公网之间的物理隔离被逾越,必然造成涉密网络的安全隐患。在某省级空地一体化土地动态监测项目中,提出了一种基于短信的异步通信协议,采用对地理空间信息数据压缩加密的处理方法,降低数据敏感度和被监听风险,保障了数据安全,实现了在野外数据通信严苛条件下对涉密网络内的地理空间信息服务的有效访问。     

强化资源保密意识

资源保密关系到经济安全和国家安危，是国土资源部门必须高度警惕的大问题。 随着高科技、信息化的迅速发展和办公自动化的普及，保密与窃密的斗争显得更加突出。微机、传真机、复印机这些办公设备的使用，一方面为我们提高工作效率、保证工作质量提供了方便，但同时也给保密工作提出了新的课题。一些单位把大量的资源信息，如资源储量报告、勘探部署、资源分布图、地质研究报告等存储在微机中，并制做成多媒体；与许多网络联接在一起，而不采取物理隔离措施，结果造成了大量高密级的资源数据和战略信息被无意泄露。再加上我们防范和反窃密…     

河南：停产停建矿山加强安全监管

日前,河南省有关部门下发通知,要求全省各地切实加强对长期停产停建金属非金属矿山的安全监管,防止矿山危险源失控发生安全生产事故。通知要求,停产停建的矿山企业在停产停建期间要严格履行安全生产主体责任。地下矿山停产停建时要封闭井口,采取措施确保外来人员无法自行人井。露天矿山、排土场停产停建时要封闭通道,采取防塌方、防滑坡技术措施,其他危险区域要设置隔离措施。     

不动产登记跨网数据交换系统设计与实现

结合山东省不动产登记“一网通办”便民服务平台建设实际，为解决不动产登记系统跨网数据交换技术问题，本文通过安全标记技术、多维动态标记和多机隔离技术等关键技术，使不动产登记跨网数据交换系统具有等级保护定制、跨级主客体访问控制和跨网应用实时监控三大系统特色，解决了数据传输安全的关键技术难题，保障了在不动产登记数据从电子政务外网交换到自然资源业务网过程中，数据从低密到高密的传输安全。     

青海省地勘局跑出城市民生地质项目复工复产加速度

正按照自然资源部、青海省委省政府决策部署和青海省自然资源厅党组工作要求,青海省地勘局坚决做到守土有责、守土尽责、守土负责,一手抓疫情防控,一手抓复工生产,"隔离病毒,不隔离工作;防控疫情,不放松生产",在确保防控安全的前提下,复工复产各项工作有序推进。截至目前,全局122个地勘项目正在开展设计编写审查,7个项目已复工,47个项目做好出队准备。重点工作任务倒排工期、挂图作战,层层压实责任,见事见人见行动见成效,最大程度降低疫情带来的影响,加     

基于改进蚁群算法的无人机低空公共航路构建方法

日益增加的无人机数量和飞手自由规划航线给航空安全带来极大隐患。构建一个安全、高效的航空飞行环境,可以为无人机活动设立隔离空域,并在隔离空域内规划无人机低空公共航路,以提高低空空域利用率,为无人机交通管理提供决策依据。本研究充分考虑无人机近地表飞行及其即时通讯等特点,以天津市为例,基于地理信息技术构建以多源地理空间数据为基础的无人机低空飞行环境,包括低空蜂窝网络环境、大气环境和政策空域环境等,并改进传统蚁群算法以搜索无人机最优路径,得到该区无人机低空公共航路网。研究结果表明,改进的蚁群算法大大提高了路径搜索效率,满足无人机航路规划的高时效性、动态更新等要求;并且天津市航路长度符合市场上现有的无人机最远航程要求,基本满足现有的无人机运输要求。本研究描述的无人机低空公共航路研究的核心算法和关键技术,可以为无人机管控系统提供核心技术支撑。     

测绘地理信息网络安全及其防护

测绘地理信息是国家重要的基础性、战略性信息资源,事关国家战略安全和核心利益.测绘地理信息网络作为数据生产、管理与服务的信息化物理载体,是安全保密防护的重点.针对近年来测绘地理信息行业安全保密建设存在的问题,依据国家有关安全保密管理政策标准要求,紧密结合测绘地理信息业务特点,提出测绘地理信息网络安全防护目标,并从意识和技术方面分析网络安全隐患,查找不足确定改进对象.在此基础上,全面分析测绘地理信息网络安全建设的主要技术与管理措施,重点就摸清涉密家底、落实管理制度和防护策略、严管涉密数据输入输出和移动存储介质等方面给出具体可行的安全防护方法,对测绘地理信息行业建设涉密网络安全防护环境具有参考价值.     

"健康住宅":你了解吗?

随着生活水平的日益提高,人们对居住环境的要求也日益高涨——向往健康、安全和舒适的居住环境。所谓“健康住宅”,就是“以人为本”,不仅包括与居住相关联的物理量值,诸如:温度、湿度、通风换气     

扶贫工作队变身抗“疫”先锋队

“请大家放心,隔离期间,一切生活用品我们一定及时保障到位。”近日,在伊川县平等乡上元村,河南省煤田地质局驻该村第一书记王立峰对从外地务工返乡人员承诺,并叮嘱驻村队员做好隔离人员的健康监管。面对突如其来的新型冠状病毒感染的肺炎疫情,王立峰迎难而上、冲锋在前,用敢于担当和勇于奉献,为广大村民筑起了一道坚固的防线。     

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联合GRACE与GRACE-FO反演2002～2020年长江流域陆地水储量变化

探讨采用不同激励函数的BP和RBF神经网络方法填补GRACE与GRACE-FO卫星空缺数据的精度及可行性,并基于最优方案对缺失数据进行填充;利用ITSG-Grace2018和ITSG-Grace_operational时变重力场模型反演2002～2020年长江流域陆地水储量变化,并结合GLDAS模型、降水、气温及长江流域水资源公报等数据对该区域的陆地水储量变化进行综合分析。结果表明：1）隐含层激励函数为线性整流函数（ReLU）的BP神经网络算法具有较好的拟合效果,可用于填充GRACE与GRACE-FO卫星任务间的数据空缺;2）长江流域的陆地水储量变化具有一定的区域差异性,主要表现为上游东部与中游大部分地区陆地水储量以5 mm/a左右的速率上升,上游中西部区域下降,下游基本保持不变;长时间序列的GRACE/GRACE-FO时变模型能够反映长江流域2019年的干旱与2017年、2019年的洪涝等灾害。     

地震前兆特征与岩样剪切应变率异常数值模拟

利用拉格朗日元法(FLAC)模拟了岩样的宏观力学行为、剪切应变率异常及演化。在峰值强度岩石的本构模型分别取线弹性模型及应变软化模型的条件下,得到如下结论：1)在弹性阶段之后,应力-时步曲线具有一定的周期性。与地震复发的周期性类似。在加载过程中,形变场由均匀逐渐向不均匀转变．最终形成交叉的剪切带网络。被该网络所包围的试样中部可视为背景空区．在空区之外,地震群比较活跃。在应变硬化阶段。可以从未来震源观测到前兆一剪切应变率异常条带。2)在中期阶段之后,空区内地震活动的开始增强明显要比空区外地震活动增强晚。地震的迁移是由外向内。3)短期阶段则相反：在硬化阶段．剪切带内外的剪切应变率的差别不很显著。试样处于相对平静状态。在软化阶段,若采用剪切应变率最大的位置作为震源．可确定震源在试样的中部。源兆和场兆都集中在老断层上。     

Applying systematic conservation planning to constitute a protection strategy for broad-leaved Korean pine forests in Changbai Mountains,China

The broad-leaved Korean pine (Pinus koraiensis) forest is one of the most biodiverse zonal communities in the North Temperate Zone and an important habitat for many endangered species. Broad-leaved Korean pine forests (BKPFs) are shrinking quickly due to deforestation and rapid urbanization. Thus, scientific protection strategies are urgently needed to change this status. Changbai Mountains contains one of the largest BKPFs and is considered a priority biodiversity conservation area in China. Guided by systematic conservation planning (SCP) methods and procedures, we chose representative species and communities in BKPFs ecosystem as priority conservation objects, and set quantitative conservation target, which is in the light of the biodiversity characteristic of BKPFs. The watershed area is used as planning unit. We used C-Plan software to calculate the irreplaceability (Ir) value of each planning unit and the contribution value (T _i ) of each conservation object to (1) assess the conservation efficiency; (2) identify the conservation gap of the existing conservation network. Then we calculated a human disturbance index (HDI) for planning units in the conservation gaps and combine this with the Ir value to design three conservation scenarios to optimize the conservation network. Results show that planning units with high conservation value 14.16% of the total area, with 3084.36 km² were covered by the existing conservation network. 79.28% of planning units with high conservation value have not been protected which were concentrated mainly in the eight gap areas. Only 25.3% of protection objects achieved their conservation target with the existing conservation network. Conservation efficiency is low. Three conservation scenarios are constituted, each prioritizing a different aim: (1) ecological value; (2) species rescue; and (3) economical avoidance. The three conservation schemes potentially enable 93%, 88% and 51% of conservation objects, respectively, to achieve identified conservation targets, thereby improving conservation efficiency significantly.     

等时线模型支持下的深圳市综合医院空间可达性测度分析

可达性是在空间分布格局、设施约束等综合条件下的空间决策问题,等时线模型为该决策分析可提供方法支持,它是以时间地理为框架,用时间成本来衡量时空可达性的重要模型。面向兴趣点（Point of Interest, POI）可达性分析通常包括2种形式：① 基于“供给”角度从特定POI出发的服务可达分析;② 基于“需求”角度从任意空间位置出发获得最近服务的便利度分析。目前的研究从“供给”角度探求特定POI的服务范围居多,对“需求”角度的等时线分析关注不够。本研究针对这一缺陷,开展面向服务需求的兴趣点可达性等时线分析,考察任意位置达到某类服务设施最近点的时间代价。在几何度量方法上,本研究利用了网络空间Voronoi图模型,与传统欧氏空间Voronoi图相比,本方法顾及了街道网络对空间通达的直接影响。本研究发现了等时线的形态、坡度等特征能够反映POI的疏密分布和道路网的通达性。     

Canopy gap characteristics and spatial patterns in a subtropical forest of South China after ice storm damage

The divergent gap characteristics and spatial patterns of canopy gaps created by natural or artificial disturbances can exert a dominant influence on forest structure and composition.However,little research has been conducted on the effects of ice storm damage on canopy gaps in subtropical mature forests of South China.In this study,one semi-natural site was dominated by a broad-leaf forest and two managed sites were representative of plantations with coniferous forests.Based on airborne laser scanning data and field evidence across sites,statistical analyses were used to examine gap characteristics following ice storms of moderate severity.Generalized Ripley's K-function analysis was applied to test gap spatial patterns at a range of scales,and spatial point pattern analysis was used to quantitate the relative importance of specific influences on patterns of gap occurrence.The results revealed that the average gap size was 75.7 m~2 and that 12.2 gaps occurred per hectare.Most gaps were single-tree fall events.In addition to more gaps,the mean gap size was smaller and the shape was more complex in the semi-natural site than in two managed sites.Large differences in gap characteristics were observed among snapped,uprooted,snag,and artificial gap damage types.Gaps generally showed a clustered distribution at large scales(e.g.70 m),whereas spatial patterns varied with gap damage types at different sites.The occurrence of gaps was strongly related to slope and topographic position at the semi-natural site,whereas slope,stem density,and human accessibility(proximity to pathways) were the most important factors affecting gap occurrence at the managed sites.We suggest that gap-based silvicultural treatments and natural disturbances regimes conjoin,highlighting interactions with other factors such as microsite conditions,non-tree vegetation and more.     

Seismic imaging of aftershock gap between Lushan and Wenchuan earthquakes

New Vp and Vs models of the aftershock gap between the 2013 Lushan and 2008 Wenchuan earthquakes were obtained using 7190 events recorded by 102 stations in the southeastern margin of the Tibetan Plateau.The new velocity models and event locations were inverted by the regional-scale version of double-difference tomography algorithm.The new velocity structure shows that the aftershock gap is an obviously low-velocity zone in the upper crust, whereas the aftershock regions of the Lushan and Wenchuan earthquakes show high-velocity anomalies.The low-velocity anomaly of the aftershock gap in the upper crust may indicate that the materials of the gap are weak and ductile, which is not prone to accumulate stress and cause big earthquakes.As a result, it is less likely that the big earthquakes will occur in the gap in the future.     

Migration of mesoscale eddies across a leaping or penetrating western boundary current in the vicinity of a gap

A 1.5-layer quasi-geostrophic reduced gravity ocean circulation model is used to study the propagation of mesoscale eddies across a western boundary current(WBC) either leaping across or penetrating in an anti-cyclonic path through the gap. The steady leaping WBC nearly blocks all eddies from propagating across it through the gap completely. However, both cyclonic and anti-cyclonic eddies can migrate across a penetrating WBC in the vicinity of a gap, while inducing an opposite type of eddies on the cyclonic side of the WBC by weakening or strengthening the intrusion of the WBC. Both type of eddies gained strength from the WBC in the course of the propagation across the WBC in the gap. Eddies approaching the gap from the upstream are found to migrate more easily into the western basin due to the advection of the WBC. The migration speeds of the eddies are almost unchanged by the presence of the WBC in all experiments.     

西安地铁隧道穿越地裂缝带的计算模型探讨

通过对西安地铁隧道穿越地裂缝带的大型物理模型试验成果的分析,提出在地裂缝活动时,穿越地裂缝带的地铁隧道有以下两个方面的变化特征:一是作用于隧道的荷载发生改变;二是在隧道底部产生脱空现象。这种脱空现象无论在整体式隧道还是盾构隧道中都会出现。造成隧道在界面上与土体脱空的原因是隧道和周围地层的变形不协调。脱空区域的大小对地铁隧道的变形与内力计算会产生明显影响。在对隧道变形特征分析的基础上,总结得出了西安地铁穿越地裂缝带隧道变形的4种计算模型:对于整体式长隧道,可以采用一端固定而另一端简支,或一端固定而另一端定向支承的计算模型;对于整体式短隧道,可以采用外伸梁模型;对于盾构隧道,可以采用一端固定而另一端定向支承的计算模型。最后,对脱空条件下隧道数值分析的建模问题进行了讨论。算例分析表明:在数值计算中,对于隧道与土体接触面的界面处理非常关键,否则将造成计算结果的重大误差。     

CHAMP姿态数据间断的处理方法与精度分析

为探究CHAMP加速度计数据的预处理方法,分析了姿态数据间断的各种情况,提出了采用二次插值方法处理姿态数据间断,并用实测的CHAMP加速度计数据进行了验证。统计结果表明采用二次插值方法处理姿态数据间断,精度比线性插值法明显提高,当姿态数据连续间断小于40个历元的情况下,内插姿态数据对加速度的影响小于10-9ms-2,不影响其使用。