Gradient Index in Wear Debris Image Collection

In order to solve a problem of oil on-line monitoring,this instrument adopts a principium of self-focus lens of Gradient index fiber(GRIN Len)to design optics system and magnetic circuit.For the magnetic circuit,the monitor can catch particle wear debris in oil.And for the optics circuit.GRIN Len can transfer image of debris to apparatus of gather image,e.g,CCD and camera.And the image of debris is transferred to computer for analyzing seize and physiognomy of debris.The character of the monitor is of micro weight,micro volume and curve imaging.And it is directly pluged into oil to catch image of wear particles.

Establishment and application of performance evaluation model for collection and transportation system of municipal solid waste

On the basis of analyzing the typical waste collection and transportation mode,the evaluation index system for performance of the waste collection and transportation system was proposed with three grades,which related to six factors,such as economic evaluation,high efficient evaluation,environmental impact assessment,resource evaluation,evaluation of security and emergency,evaluation of management and society. With the performance evaluation theory,the performance evaluation model of waste collection and transportation system was constructed,which quantified the grading standard of index and determined the index weight in analytic hierarchy process (AHP). After evaluating the waste collection and transportation system of the main districts of Chongqing city,the results show that the it has an excellent performance evaluation grade with very high performance level of three indices involving evaluation of management and society,environmental impact assessment,evaluation of security and emergency and quite low performance level of two indices that include high efficient evaluation and economic evaluation.

A multi-index coupling system of ice slope stability and its application

Based on the Simplified Bishop Method, the minimum safety factor of ice slope both with and without tension cracks is calculated in combination with triaxial compression tests. It is found that there exists a critical depth for each crack. Then, factors influencing ice slope stability such as slope ratio, slope height, ice cohesion, internal friction angle, unit weight and temperature were analyzed. Meanwhile, a regression equation between the aforementioned factors and safety factor is obtained, with which sensitivity analysis is carried out. The performance function is built in combination with random distribution of physical and mechanical parameters to analyze the reliability index. The Advanced First Order Second Moment Method is employed on the solution to the perfor- mance function. The one-way coupling system of ice slope stability is therefore formed based on safety factor and reliability index. Finally, an illustrated example of ice slope is provided, which shows that failure probability is relatively high, up to 6.18%, alt- hough safety factor is 2.77. Thus, it is objective and reasonable to apply the coupled system method to the slope stability rating.

集合空间关键字内聚组查询方法

给定一个道路网络和社交网络,集合空间关键字查询的目的是找到一组兴趣点,该组兴趣点的文本信息包含所有查询关键字,与查询的位置较近且彼此之间的距离较小。内聚组查询的目的是找到在地理位置和社交关系上紧密联系的一组用户;而集合空间关键字内聚组查询的目的是找到满足查询要求的一对最佳匹配的兴趣点集合和用户集合。针对这一问题,提出一种新的集合空间关键字内聚组查询处理模式。首先通过快速贪心查询过程获得候选兴趣点集合,然后使用core-tree结构存储(k,c)-core核心分解的结果,从而提高内聚组查询效率,并且保证查询结果能够同时满足用户之间的社会关系约束和兴趣点之间的空间位置约束。通过在真实数据集上开展实验,结果表明提出的方法比枚举方法的查询效率快1~2个数量级,并且具有较高查询准确性。

冰面放电的纹影图像处理及折射率场重建方法

相比于电流、电压等传统测量方法,利用纹影技术拍摄得到的冰面局部电弧等放电的图像更加直观,其图像处理和折射率场重建是定量分析放电的几何尺寸、密度、粒子分布等物理特性的基础。从放电通道的光偏折特性出发,介绍了利用纹影成像技术测量放电通道的原理;提出了一套覆冰表面放电通道的图像处理和折射率场数值重建方法,通过数值实验验证了算法准确性。实测结果表明,所设计的纹影系统空间分辨率为10~100μm/像素可调、时间分辨率为1~38.45μs可调;提出的折射率场重建方法具有较高精度,能够有效得到冰面局部电弧形成过程中各个放电阶段的折射率场。

不同光谱采集方式对手持式近红外建模效果的影响

对烟叶原烟采取滑动法和六点法2种方式进行扫描,同时对烟末样品采取滑动法,用二阶导数预处理,异常样本剔除、波长选择、剔一交互验证等后用偏最小二乘法分别建立烟碱模型,三者的相关系数分别为0.97、0.98、0.99,三者的校正标准误差(SEC)分别为0.20%、0.25%、0.09%。结果表明烟叶样品采用滑动法扫描优于六点法,检测的烟叶样品更具有代表性和其快速的结果能满足实际应用需求,在应用过程中节省大量的时间,明显提高工作效率。

太行肉牛育种指数构成分析

对应太行肉牛育种实践,综合分析太行肉牛新品种选育的目标性状以及各性状在总性能指数构成中的权重。太行肉牛新品种选育的总性能指数由体型结构、适应性、生长发育、繁殖力、泌乳力及牛肉指数等六大目标性状构成,权重分别为16%、18%、25%、25%、6%和10%。同时描述了各目标性状的具体度量与数据采集方法。以期业界同仁共同探讨、批评指正,合力推进太行肉牛的育种进程。

BioTreasury:a community-based repository enabling indexing and rating of bioinformatics tools

The exponential growth of bioinformatics tools in recent years has posed challenges for scientists in selecting the most suitable one for their data analysis assignments.Therefore,to aid scientists in making informed choices,a community-based platform that indexes and rates bioinformatics tools is urgently needed.In this study,we introduce Bio Treasury(http://biotreasury.rjmart.cn),an integrated communitybased repository that provides an interactive platform for users and developers to share their experiences in various bioinformatics tools.Bio Treasury offers a comprehensive collection of well-indexed bioinformatics software,tools,and databases,totaling over 10,000 entries.In the past two years,we have continuously improved and maintained Bio Treasury,adding several exciting features,including creating structured homepages for every tool and user,a hierarchical category of bioinformatics tools and classifying tools using large language model(LLM).Bio Treasury streamlines the tool submission process with intelligent auto-completion.Additionally,Bio Treasury provides a wide range of social features,for example,enabling users to participate in interactive discussions,rate tools,build and share tool collections for the public.We believe Bio Treasury can be a valuable resource and knowledge-sharing platform for the biomedical community.It empowers researchers to effectively discover and evaluate bioinformatics tools,fostering collaboration and advancing bioinformatics research.

六盘山华北落叶松人工林叶面积指数的校准

为了提高植物冠层分析仪在测量森林叶面积指数时的精度和适用范围,在宁夏六盘山北部,选取不同林分特征的华北落叶松人工林,应用凋落物收集法测量华北落叶松人工林真实的叶面积指数,从而确定植物冠层分析仪测量的叶面积指数的误差范围,并进行校准。结果表明:(1)六盘山华北落叶松人工纯林的叶面积指数为0~2.96,在8—10月呈现减小的趋势。(2)在生长季中期(7—9月)植物冠层分析仪测得的叶面积指数偏小,误差范围在0.03~0.38(1.41%~15.89%),而在生长季末期(10月)的测量值则偏大,误差范围在0.04~0.86(1.67%~90.87%)。(3)植物冠层分析仪测量产生误差与林分郁闭度、林分密度、树高、胸径等密切相关。因此,可通过构建林分特征与叶面积指数的多因素耦合模型,从而提高植物冠层分析仪的测量精度和适用范围。

马尾松林叶面积指数季节动态的测定

【目的】评价光学仪器法测定马尾松林叶面积指数(LAI)的精度,为准确监测马尾松林LAI季节动态提供技术支持。【方法】以凋落物法测定值代表马尾松林真实的LAI,对展叶调查、异速生长方程法和光学仪器法(半球摄影法和LAI-2200植物冠层分析仪)获取的马尾松林LAI季节动态进行评估,并量化不同因素包括集聚指数(ΩE)、木质比例(α)和针簇比(γE)对光学仪器测定值的影响。【结果】马尾松林内主要树种的平均叶寿命为1.53~1.94,比叶面积(SLA)差异较大(99.15~278.33 cm^(2)/g)。不同方法测定马尾松林LAI的季节动态均呈单峰形变化模式,且在7月达到峰值。在各调查时期,凋落物法的测定值与异速生长方程法的测定值差异不显著。半球摄影法测定的有效叶面积指数(Le)比凋落物法、异速生长方程法的测定值分别低估了49%~64%和47%~61%;LAI-2200植物冠层分析仪法测定的Le低估了25%~44%和20%~42%。半球摄影法测定的Le经自动曝光、α、ΩE及γE校正后,精度明显提高,比凋落物法、异速生长方程法平均低估了8%和5%;LAI-2200植物冠层分析仪法测定的Le经α、ΩE及γE校正后,其精度大幅度提高,比凋落物法、异速生长方程法平均低估了6%和2%。【结论】考虑影响光学仪器法测定LAI的因素后,半球摄影法和LAI-2200植物冠层分析仪法测定的LAI精度得到明显提高,表明两种光学仪器法均能相对准确地测定马尾松林LAI的季节动态,可为不同区域马尾松林LAI季节动态的研究提供方法参考。

基于标准化温度指数的南水北调中线工程沿线地区冷暖冬评估

选择南水北调中线工程沿线邯郸、正定、涿州为代表地区,利用1979-2021年冬季逐日气温数据,分析各代表区气温序列统计频率分布与理论概率分布的拟合情况,提出标准化温度指数(standardized temperature index,STI),并据此建立新的冬季冷暖量化评估模型。结果表明:STI方法与国标法的冬季冷暖评估结果基本一致,但在各代表区强冷冬和强暖冬划定上,STI评估得出的年份数量均少于国标法;各代表区以1月份气温计算得出的冷暖等级阈值对应的气温值均明显低于按整个冬季3个月计算结果。工程所在纬度越高,冬季冷暖等级阈值对应的气温值越低;根据STI评估结果,邯郸、正定、涿州发生强冷冬概率分别为7.14%、9.52%和4.76%,发生弱冷冬及以上的概率分别为38.09%、40.48%和38.09%,发生平冬的概率分别为21.43%、28.57%和21.43%,发生弱暖冬及以上的概率分别为40.48%、30.95%和40.48%,发生强暖冬的概率分别为4.76%、7.14%和2.38%。研究成果与基于正态分布的国标法相比,考虑了气温序列的偏态性概率分布特征,对相对冷暖的判别更科学,有推广应用价值。

基于单片机技术的无人船湿地环境监测系统设计

针对当前湿地环境监测工作耗时耗力、安全系数低、成本高和采样难度大的问题,提出基于STC89C52RC和HC-12的无人船湿地环境监测系统。系统以STC89C52RC单片机为主控单元,使用便携式移动电源供电,通过导线连接由nRF905无线通信模块、HC-12无线通信模块、电机驱动系统、舵机驱动系统、水样采集系统、全球定位系统(global position system,GPS)和水质指标监测系统等构成的湿地环境监测无人船系统硬件部分,通过串口分别连接和烧写使用C#、keil软件制作上位机程序与nRF905单片机驱动程序,实现计算机通过串口通信方式完成单片机之间的无线通信和AT指令集的收发,从而达成计算机远距离实时遥控无人船进行定点水样采集与pH、浊度、温度指标监测的目的。野外实验结果证明,系统运行稳定,且水质指标测定结果精准。

新型农村集体经济政策的量化评价——基于PMC指数模型

新型农村集体经济政策对发展新型农村集体经济具有导向性意义。以2020—2022年出台的5项新型农村集体经济政策为研究对象,基于国内外学者的研究成果,通过文本挖掘方法,对新型农村集体经济政策进行高频词分析,并根据新型农村集体经济的特征,结合PMC指数模型法,构建涵盖多个变量指标的新型农村集体经济政策评价指标体系。该体系包含10个一级变量及45个二级变量。综合考虑多方面因素后,给二级变量赋值,计算各项政策的PMC指数,绘制PMC曲面图。研究结果表明,我国新型农村集体经济政策整体态势良好,设计较为合理,但仍存在管理人才匮乏、政策视角单一、政策前瞻指引力较弱和相关激励措施不足的问题。对此,应建立、完善相关人才引进和培育政策,丰富政策视角,开展新型农村集体经济的前瞻性研究和阶段性评估,加大财政奖补、税费减免等激励措施力度。

压气机叶栅冰晶撞击特性的数值模拟研究

航空发动机吸入冰晶会导致推力损失甚至叶片损坏,对飞行安全构成潜在威胁。为了研究冰晶在压气机叶栅中的撞击特性,建立了一种分别计算颗粒撞击叶片压力面和吸力面时运动轨迹的方法,该方法可以避免冰晶颗粒轨迹交叉。在此基础上,对颗粒等效直径和形状对冰晶撞击特性的影响进行了数值模拟研究。结果表明,总收集系数随颗粒等效直径和长宽比的增加而增加。对于相同形状的颗粒,当颗粒直径从20μm增加到50μm时,总收集系数增加了44.1%;对于相同等效直径的颗粒,当颗粒长宽比从0.1增加到10时,总收集系数增加了39%。叶片压力面收集系数的增加是总收集系数增加的主要原因。冰晶撞击叶片前缘时发生破碎现象,撞击叶片表面时发生反弹现象。在叶片表面的大部分区域,冰晶颗粒发生非弹性反弹。就粒径而言,二次撞击后收集系数的分布趋势与一次撞击近似,二次收集系数的最大值减少了约70%。然而,就颗粒长宽比而言,叶片前缘处二次撞击收集系数的分布趋势与一次撞击相反,细长型冰晶颗粒撞击叶片前缘的二次收集系数反而低于粗短型冰晶颗粒撞击叶片前缘的二次收集系数。

基于多级索引集群均衡的电力能源大数据采集方法研究

电力能源是现今人们生产、生活使用最为广泛的能源之一,处于持续短缺状态;电力能源产生的数据量级较大,如何在电力能源大数据中精确查询并采集需求数据,对电力能源合理管理与应用至关重要。提出一种基于多级索引集群均衡的电力能源大数据采集方法。深入分析电力能源大数据存储情况(电力能源数据表与元数据表),构建多级索引集群;采用定向任务分配算法均衡处理多级索引集群,确定每个集群节点的任务分配结果;以集群节点任务分配结果为依据,配置并启动多级索引集群;结合电力能源大数据查询需求,对查询数据进行缓存,最终实现电力能源大数据的采集。实验数据表明:相较于对比方法,应用所提方法获得的构建索引耗时和需求数据查询时延均更少,其最小值分别为3 s、12.03 s;数据采集质量参数更大,最大值为9.6,证实了提出方法具有可行性。

农村集体产权改革政策的多维度分析——基于政策一致性指数模型的量化研究

农村集体产权改革是实现乡村振兴战略的基础。研究对2015年以来各地方政府出台的469份改革政策文本进行预处理,分析改革政策在时间、空间和内容多维度上的分布特征,运用政策一致性指标模型,对不同地区改革政策进行分类评价。研究发现,时间维度上,改革政策随着试点批次的变化由政府主导拓展至社会参与,再延伸至市场嵌入。内容维度上,改革政策不断深化实施环境、优化执行路径和细化具体内容。空间维度上,有3份省级和2份地级政策为优秀,东部和西部各有2份政策为优秀,将政策归纳为偏环境型、偏需求型、偏供给型和偏混合型。其中,省级侧重宏观政策实施要求、督促改革过程,地级突出政策支持力度,县级控制改革进程,乡级落实改革内容,但缺乏政策保障和政策激励。改革政策在地方实践中存在空转现象,未来应当在支持力度、资产管护和改革普惠等方面进行强化。

智慧社会发展评价应用探索

智慧社会发展评价分析通过对基础数据分析,利用无量纲测算、分级测算、修正指标测算等方法,采用客观评价和专家综合评估相结合方式,实现对区域智慧社会发展综合评价.本文结合本地区实际,详细阐述了智慧社会评价体系、综合评价算法、综合评价过程以及算法优化,验证了评价结果,为其他城市的智慧社会发展评价提供了可借鉴的经验.

Influence of data analysis when exploiting DFN model representation in the application of rock mass classification systems

Discrete fracture network(DFN) models have been proved to be effective tools for the characterisation of rock masses by using statistical distributions to generate realistic three-dimensional(3 D) representations of a natural fracture network. The quality of DFN modelling relies on the quality of the field data and their interpretation. In this context, advancements in remote data acquisition have now made it possible to acquire high-quality data potentially not accessible by conventional scanline and window mapping. This paper presents a comparison between aggregate and disaggregate approaches to define fracture sets, and their role with respect to the definition of key input parameters required to generate DFN models. The focal point of the discussion is the characterisation of in situ block size distribution(IBSD) using DFN methods. An application of IBSD is the assessment of rock mass quality through rock mass classification systems such as geological strength index(GSI). As DFN models are becoming an almost integral part of many geotechnical and mining engineering problems, the authors present a method whereby realistic representation of 3 D fracture networks and block size analysis are used to estimate GSI ratings, with emphasis on the limitations that exist in rock engineering design when assigning a unique GSI value to spatially variable rock masses.

Impact of Using Stevia on Physicochemical, Sensory, Rheology and Glycemic Index of Soft Ice Cream

The aim of this study was to formulate and develop a low calorie and low glycemic index (GI) of soft ice cream by using mixture of sucrose and Stevia. Five different formulations of ice cream were produced by using different proportions of sucrose and Stevia. Physicochemical characteristics, hedonic sensory evaluations and glycemic index determination of products were carried out by following conventional methods. Replacement of sucrose with Stevia resulted in a significantly lower viscosity and brix with a higher overrun and melting rate in a dose dependent manner. Total replacing of sucrose with Stevia resulted in significant reduction in caloric value from 143.03 to 105.25 Kcal and GI from 79.06 ± 4.0 to 72.18 ± 5.27 as compared to those of sucrose based formulation (p 0.05) indicating a 37.78% and 6.88% reduction, respectively. TB had the best sensory acceptance among all the treatments. We concluded that substitution of sucrose with Stevia may be a choice to produce low caloric and GI ice creams. However, using mixture of the two sweeteners improves sensory acceptance of the formulations.

热烈祝贺我刊被波兰《哥白尼索引》(Index Copemicus，IC)收录

2008年01月10日,我刊编辑部收到了波兰《哥白尼索引》(Index Copernicus)数据库的回复电子邮件,通知我刊以4.4的高分顺利通过评估,已将本刊自2008年第1期开始作为收录刊源。《哥白尼索引》简介: