Public Security Risk m Large Scale Activities and the Standardization Prospects

This paper generalizes the definition and its scope of large scale activity based on its current practice and supervision system in China, makes risk analysis during activities, and puts forward proposals on carrying out relevant standardization works after discussions about the actuality and prospect of social security on large scale activities in China.

Decentralized Stabilization of Large-scale Uncertain Systems with State-Delays——LMIs Approach

This paper deals with the problem of decentralized robustcontrol for a class of interconnected uncertain systemswith state delays.The parameter uncertainties are un-known but norm-bounded.A new sufficient condition isobtained for each subsystem and overall system to be sta-bilizable via linear memoryless state feedback robust de-centralized controllers.The results depend on the size of the delays and are given in terms of linear matrix ine-qualities,so they are less conservative than those of delay-independent.Moreover,matching condition is not a necessary condition.Finally,an example is presented to illustrative the effectiveness of the proposed method.

Utilization Survey of Livestock Manure Resources in Large-scale Farms of Yangzhou

Based on surveying the conditions of large -scale farms and commercial manure in the each county of Yangzhou city, the situations and problems for utilization of livestock manure resources were grasped. After an analysis of the potential value of livestock manure, the suggestion and strategy for utilization of livestock manure resources were proposed based on the actual conditions in Yangzhou city.

Formation conditions and exploration direction of large natural gas reservoirs in the oil-prone Bohai Bay Basin, East China

The Bohai Bay Basin is a typical oil-prone basin, in which natural gas geological reserves have a small proportion. In this basin, the gas source rock is largely medium-deep lake mudstone with oil-prone type Ⅱ2-Ⅱ1 kerogens, and natural gas preservation conditions are poor due to active late tectonic movements. The formation conditions of large natural gas fields in the Bohai Bay Basin have been elusive. Based on the exploration results of Bohai Bay Basin and comparison with large gas fields in China and abroad, the formation conditions of conventional large-scale natural gas reservoirs in the Bohai Bay Basin were examined from accumulation dynamics, structure and sedimentation. The results show that the formation conditions of conventional large natural gas reservoirs in Bohai Bay Basin mainly include one core element and two key elements. The core factor is the strong sealing of Paleogene "quilt-like" overpressure mudstone. The two key factors include the rapid maturation and high-intensity gas generation of source rock in the late stage and large scale reservoir. On this basis, large-scale nature gas accumulation models in the Bohai Bay Basin have been worked out, including regional overpressure mudstone enriching model, local overpressure mudstone depleting model, sand-rich sedimentary subsag depleting model and late strongly-developed fault depleting model. It is found that Bozhong sag, northern Liaozhong sag and Banqiao sag have favorable conditions for the formation of large-scale natural gas reservoirs, and are worth exploring. The study results have important guidance for exploration of large scale natural gas reservoirs in the Bohai Bay Basin.

大型活动踩踏事故“态-势”情景构建与组合推演方法

为解决大型活动踩踏事故形成过程情景描述困难,决策者对大型活动踩踏事故情景演化不易掌握等问题,提出大型活动踩踏事故“态-势”情景构建与组合推演方法。首先,从影响大型活动形成的人、场地、管理、环境4因素提取大型活动踩踏事故情景要素,建立对大型活动研究的“态”“势”形式化表达方法;其次,基于马尔可夫模型,给出情景“态-势”转化的推演描述与计算方法;最后,以上海外滩事故为例进行实证分析。结果表明:提出的大型活动踩踏事故“态-势”情景构建与推演方法,能够提供情景结构化表达的统一方式和突发事件情景之间演化进程的重构还原。实证分析结果显示,推演结果与外滩事故实际发展过程基本一致,证明所提方法具有一定的科学性和有效性。

A Dynamic Active-Set Method for Linear Programming

An efficient active-set approach is presented for both nonnegative and general linear programming by adding varying numbers of constraints at each iteration. Computational experiments demonstrate that the proposed approach is significantly faster than previous active-set and standard linear programming algorithms.

Lp-PLA2、HDAC3、TAFI水平对大面积半球脑梗死患者预后的评估价值

目的探究脂蛋白相关磷脂酶A2(Lp-PLA2)、组蛋白脱乙酰酶(HDAC)3、凝血酶活化纤维蛋白溶解抑制物(TAFI)在大面积半球脑梗死患者预后评估中的价值。方法选取2020年3月—2023年3月河南科技大学附属黄河医院120例大面积半球脑梗死患者(大面积半球脑梗死组),另选取同期120名体检健康者(正常对照组)。采用酶联免疫吸附试验检测所有研究对象Lp-PLA2、HDAC3、TAFI水平。对所有大面积半球脑梗死患者进行90 d的随访,其中预后不良组45例、预后良好组75例。采用Spearman相关分析评价Lp-PLA2、HDAC3、TAFI水平与美国国立卫生研究院卒中量表(NIHSS)评分的关系。采用受试者工作特征(ROC)曲线评估Lp-PLA2、HDAC3、TAFI判断大面积半球脑梗死患者预后的效能。采用多因素Logistic回归分析评估大面积半球脑梗死患者预后不良的影响因素。结果与正常对照组比较,大面积半球脑梗死组Lp-PLA2、HDAC3、TAFI水平显著升高(P<0.001)。大面积半球脑梗死患者Lp-PLA2、HDAC3、TAFI水平与NIHSS评分呈正相关(r_(s)值分别为0.542、0.620、0.597,P<0.05)。与预后良好组比较,预后不良组NIHSS评分、Lp-PLA2、HDAC3、TAFI水平显著升高(P<0.001)。NIHSS评分、Lp-PLA2、HDAC3、TAFI是大面积半球脑梗死患者预后不良的危险因素(P<0.01)。Lp-PLA2、HDAC3、TAFI和NIHSS评分单项检测和联合检测判断大面积半球脑梗死患者预后不良的曲线下面积(AUC)分别为0.790、0.795、0.780、0.908和0.964。结论大面积半球脑梗死患者Lp-PLA2、HDAC3、TAFI水平显著升高,Lp-PLA2、HDAC3、TAFI和NIHSS评分联合检测对大面积半球脑梗死患者预后评估有较高的价值。

浅议大型健康传播活动的品牌建设--以广州市健康教育周为例

大型健康传播活动是一种广泛使用的健康教育形式。本文通过分析2001—2023年连续举办了23届的广州市健康教育周大型健康传播活动,探索品牌建设对于大型健康传播活动增强传播效果的积极意义和经验。

基于Multi-agent的大型会展活动的游客协调控制方法

从活动组织者的角度出发提出了两种基于multi-agent的应用于大型会展活动的游客协调控制方法,其中,方法一是基于个体决策-群体协调机制的游客行程的全路线设计,方法二是基于择优选择机制的逐次决定游客下一参观点的路线设计.对两种协调控制方法进行了计算机仿真检验,仿真结果表明两种方法都能在满足实时响应要求的情况下显著改善排队拥挤状况,同时得出两种方法各有不同的适用情境,方法一更适用于客流量适中或稍多的场景,而方法二更适用于客流量很大的场景,两种方法的结合应用可以带来更好的效果.

活化-溶解法规模化生产硝酸钯的工艺研究

通过对稀王水控量溶解钯的条件、活性钯粉的还原条件、硝酸溶解钯的条件研究,解决了部分钯粉不能完全溶解的困难,建立了活化-溶解法规模化生产硝酸钯的工艺条件。对活化前后钯粉的粒度、比表面积和表面形貌分析的结果表明,活化后钯粉颗粒变小,表面积增大,扫描电镜显示,活化后钯粉粒径变小,呈海绵状,钯的溶解活性提高,有利于钯粉的完全溶解。

产磷脂酶菌株蜡样芽胞杆菌AF-1发酵条件的研究

以蜡样芽胞杆菌(Bacillus cereus)AF-1为发酵菌株,对其发酵产磷脂酶培养基和发酵条件进行优化。结果表明,最佳培养基组成为:葡萄糖2%,蛋白胨3%,磷酸氢二钠1.5%,磷酸二氢钾0.3%,硫酸镁0.06%,氯化钙0.01%;15 L发酵罐发酵条件为发酵时间30 h,装液系数为0.67,接种量为10%,初始p H值为7.5,发酵温度为35℃,通气量为0.3 m3/h,在此最佳条件下得到的发酵液磷脂酶活力为41.57 U/m L。

西安全运会大型活动警务保障策略研究——基于SWOT-PEST分析法

2021年第十四届全运会在陕西举办,西安市作为全运会的主赛场,需保障全运会的社会公共安全,公安机关要加强对大型活动警务保障的工作认识,选择安全保障策略。本文基于SWOT-PEST分析法,对西安全运会大型活动警务保障现状进行了分析,并根据分析结果提出以规章制度保障全运会的安全,优化产业布局、提高西安市经济发展水平,建立公安机关内部统一协调联动机制等,最终形成分工有序、协作密切的大西安警务保障体系。

Compositional Shifts in Ammonia-Oxidizing Microorganism Communities of Eight Geographically Different Paddy Soils —Biogeographical Distribution of Ammonia-Oxidizing Microorganisms

Soil nitrification is mediated by ammonia-oxidizing archaea (AOA) and bacteria (AOB), which occupy different specialized ecological niches. However, little is known about the diversification of AOA and AOB communities in a large geographical scale. Here, eight paddy soils collected from different geographic regions in China were selected to investigate the spatial distribution of AOA and AOB, and their potential nitrification activity (PNA). The result showed that the abundance of AOA was predominant over AOB, indicating that the rice fields favor the growth of AOA. PNA highly varied from 0.43 to 3.57 μg NOX-N·g·dry·soil·h-1, and was positively related with soil NH3 content, the abundance of AOA community, and negatively related with the diversity of AOB community (P amoA genes revealed remarkable differences in the compositions of AOA and AOB community. Phylogenetic analyses of amoA genes showed that Nitrosospiracluster-3-like and Nitrosomonas cluster 7-like AOB extensively dominated the AOB communities, and 54d9-like AOA within the soil group 1.1b predominated in AOA communities in paddy soils. Redundancy analysis suggested that the spatial variations of AOA community structure were influenced by soil TN content (P < 0.01), while no significant correlation between AOB community structure and soil properties was found. Findings highlight that ammonia oxidizers exhibit spatial variations in complex paddy fields due to the joint influence of soil variables associated with N availability.

Diversification of ammonia-oxidizing microorganisms in seven geographically different paddy soils in Sichuan

The diversification of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) communities and their potential nitrification activity (PNA) on a large scale have not been well documented. In this work, seven paddy soils from different geographic regions in Sichuan, P. R. China were selected to determine the spatial distribution of the activities, abundances and community compositions of AOB and AOA. PNA varied greatly among paddy soils, and was positively correlated with soil pH (P< 0.05). The abundance of AOA was 81.1 to 1 670.0 times more than that of AOB, which indicates paddy soil environments favor the growth of AOA. Denaturing gradient gel electrophoresis fingerprints of amoA genes exhibited distinct spatial differences in AOA compositions rather than in AOB compositions. Sequencing analysis revealed that acidic soils were dominated by AOA within marine group 1.1 a-associated lineage, whereas the soil group 1.1b lineage AOA predominated in neutral and alkaline soils. Both nitrosopira cluster 3-like and Nitrosomonas cluster 7-like AOB dominated the AOB communities in the paddy soils. Redundancy analysis suggested that soil NH4^+-N content was the most significant driver determining the AOB community structure, while no significant correlation between AOA community structure and soil properties was found. The findings highlight that the activity and composition of ammonia oxidizers exhibit spatial variations in complex paddy fields due to the joint influence of soil variables associated with pH and N availability.

全球50km分辨率SNU-AGCM模式模拟热带气旋活动

为了验证50 km分辨率的SNU-AGCM模式(Seoul National University Atmospheric General Circulation Model)模拟TC活动的能力,利用Hadley中心月平均海温资料驱动模式,模拟了1980—2009年全球热带气旋的活动特征。与观测资料对比分析,两组利用不同对流参数化方案的试验,都能够模拟与观测类似的TC结构以及全球TC活动的主要特点,包括全球生成总频数、各海区路径分布和TC活动的季节变化。但是各个海域TC生成的年平均频数与观测还存在明显差异。模式中西北太平洋和南太平洋两组试验平均的TC频数较观测分别偏多21.5%和31.3%;而北大西洋、南北印度洋分别偏少11.4%、41.1%和50%。模拟的东北太平洋TC比观测少了将近88%,而观测中TC极少的南大西洋在两组试验中平均每年却有1.5个TC生成。模拟的TC频数较观测的差异主要与模拟的北印度洋季风、西北太平洋季风槽、垂直风切变、850 h Pa相对涡度与观测的差异有关。

大型活动火灾风险评估方法研究及应用--以北京某大型活动为例

以北京某大型活动为例进行火灾风险评估,对停车区、建筑展馆等7个区域进行风险辨识,根据辨识结果,采用德尔菲法以火灾危险源、建筑防火、人员状况及消防力量构建火灾风险评估指标体系,运用层次分析法确定火灾风险评估指标权重,最后采用专家打分法得出北京某大型活动的火灾风险等级及风险值较高的指标。结果表明,提出的相应对策措施为安全管理部门提供监管方向,为保障大型活动的安全稳定运行提供一种切实可行的技术参考。

DESIGN AND ANALYSIS OF NOVEL ACTIVE ACTUATOR TO CONTROL LOW FREQUENCY VIBRATIONS OF SHAFT SYSTEM

Aiming at providing with high-load capability in active vibration control of large-scale rotor system, a new type of active actuator to simultaneously reduce the dangers of low frequency flexural and torsional vibrations is designed. The actuator employs electro-hydraulic system and can provide a high and circumferential load. To initialize new research, the characteristics of various kinds of active actuators to control rotor shaft vibration are briefly introduced. The purpose of this paper is to introduce the preliminary results via presenting the structure, functions and operating principles, in particular, the working process of the electro-hydraulic system of the new actuator which includes a set of high speed electromagnetic valves and a series of sloping cone-shaped openings, and presenting the transmission relationships among the control parameters from control signals into the valves to active load onto shaft. The course of the work is dynamic, and a series of spatial forces and moments are put on the shaft to get an external resultant force to reduce excitations that induce vibration of shafts. By checking states of vibration, the actuator can control the impulse width and the interval of injection time for applying different control force to a vibration shaft in two circumference directions through the regulating action of a set of combination directional control valves. The results from simulating analysis and experiment show evidence of that this design can satisfy the case of active process of decreasing of flexural and torsional vibrations.

Active Probing Based Method for Fault Diagnosis Using Bayesian Network

Fault diagnosis on large-scale and complex networks is a challenging task, as it requires efficient and accurate inference from huge data volumes. Active probing is a cost-efficient tool for fault diagnosis. However almost all existing probing-based techniques face the following problems: 1) performing inaccurately in noisy networks; 2) generating additional traffic to the network; 3) high cost computation. To address these problems, we propose an efficient probe selection algorithm for fault diagnosis based on Bayesian network. Moreover, two approaches which could significantly reduce the computational complexity of the probe selection process are provided. Finally, we implement the new proposed algorithm and a former representative probing-based algorithm (BPEA algorithm) on different settings of networks. The results show that, the new algorithm performs much faster than BPEA does without sacrificing the diagnostic quality, especially in large, noisy and multiple-fault networks.

多因素协同的大型活动场馆周边路段速度预测

大型活动会引起举办场馆周边区域路网出现交通流短时骤增与消散,导致周边区域路网交通运行呈现偶发性与不确定性波动,而现有预测方法通常难以捕捉特殊事件下交通流受多维因素复杂影响及其演变机理。为充分挖掘路段速度的时间序列和影响因素特征,揭示速度预测中不同影响特征间的耦合作用机理,提出了一种结合可解释机器学习与长短时记忆网络的速度预测模型(MC-LSTM)。结合大型活动的特点构建影响因素集,采用XGBoost算法评价活动规模、性质等因素特征对场馆周边路段速度的影响相对重要度,量化多元因素对场馆周边路网运行状态的协同效用,融合LSTM网络,考虑交通状态的时间依赖关系,捕获不同历史时期的时间相关性,实现对活动期间场馆周边路段速度的精确预测。以北京市连续6个月的大型活动期间周边路网为例进行模型验证,结果表明:所构建的MC-LSTM模型的预测精度可达94.5%以上,优于考虑多因素协同的XGBoost模型、只考虑单因素特征的LSTM模型及未考虑外部特征的LSTM模型,证明该研究所提出的模型有效性与稳定性更优,可为大型活动场馆周边路网交通组织优化和制定针对性交通管控与保障措施提供定量化的决策依据。

西藏波密地区深部密度结构与地震活动的关系

西藏波密地区位于南迦巴瓦构造结东北部,是研究喜马拉雅东构造结演化的关键地区。本文首次获得波密地区1:20万布格重力数据,并利用小波变换多尺度分解方法、刻痕分析方法和重力三维反演方法,获得了不同尺度的重力异常、断层分布和密度结构。结果分析表明,波密地区整体地壳密度变化明显,与断裂分布密切相关。同时结合区域地质资料,在波密地区推断了20条断裂,发现了4处较大的横向密度不均匀带,并推断了贯穿研究区的嘉黎断裂带的产状。在此基础上利用该地区地震及余震活动记录,本文分析了深部密度结构与地震的关系。通过对研究区的断裂构造、地震活动与重力异常的密度横向变化可知,该地区地震活动、断裂带与岩石密度扰动的横向不均匀性密切相关,地震主要位于密度差异带整体的垂向的高密度区域。最后讨论了深部密度结构对波密地区大型工程建设的潜在影响。