GeoPyTool:A cross-platform software solution for common geological calculations and plots

GeoPyTool is an open source application developed for geological calculations and plots,such as geochemical classification,parameter calculation,basic statistical analysis and diagrams for structural geology.More than acting as a link from raw data stored in Microsoft Excel■(MS Excel)files to vector graphic files,GeoPyTool includes recently developed routines that have not been included in previous software,such as the calculation of the Ce(Ⅳ)/Ce(Ⅲ)ratio for zircons as a method to examine the temporal evolution of oxygen fugacity in the magmatic source for igneous rocks,and the temperature calculator with titanium in zircon and zirconium in rutile.Besides these routines,GeoPyTool also allows users to load any figure from articles or books as a base map.As a Python-based crossplatform program,GeoPyTool works on Windows?,MacOS X?and GNU/Linux.GeoPyTool can do the whole process from data to results without the dependence of Microsoft Excel?,CorelDraw?and other similar software.It takes Excel?XLSX and CSV(Comma Separated Value)as the formats of both the input data source files and the output calculation results files.The figures generated by GeoPyTool can be saved as portable network graphics(PNG),scalable vector graphics(SVG)or portable document format(PDF).Another highlight of GeoPyTool is the multilingual support,the official versio n of GeoPyTool supports both Chinese and English,and additional languages can be loaded through interface files.GeoPyTool is still in the development stage and will be expanded with further geochemical and structural geology routines.As an open source project,all source code of GeoPyTool are accessible on Github(https://github.com/GeoPyTool/GeoPyTool).Users with Python experience can join in the development team and build more complex functions expanding the capabilities of GeoPyTool.

The Design and Implementation of Qt-based Cross-platform Video Conferencing Remote Control

In order to overcome the defects of the dedicated video conference remote control, this paper designs and implements a Qt-based cross-platform video conferencing remote control. The remote control not only implements a full range of video conferencing control functions with an easy-to-use visual interface;but also implement cross-platform feature to allow users to use remote control software on their own equipment. It is economic, convenient and stylish for users. This paper mainly describes the design and implementation of remote control system framework and cross-platform features. Finally, the result in the paper shows: This remote control is reliable and easy to use.

Cross-coupling integral adaptive robust posture control of a pneumatic parallel platform

A pneumatic parallel platform driven by an air cylinder and three circumambient pneumatic muscles was considered. Firstly, a mathematical model of the pneumatic servo system was developed for the MIMO nonlinear model-based controller designed. The pneumatic muscles were controlled by three proportional position valves, and the air cylinder was controlled by a proportional pressure valve. As the forward kinematics of this structure had no analytical solution, the control strategy should be designed in joint space. A cross-coupling integral adaptive robust controller(CCIARC) which combined cross-coupling control strategy and traditional adaptive robust control(ARC) theory was developed by back-stepping method to accomplish trajectory tracking control of the parallel platform. The cross-coupling part of the controller stabilized the length error in joint space as well as the synchronization error, and the adaptive robust control part attenuated the adverse effects of modelling error and disturbance. The force character of the pneumatic muscles was difficult to model precisely, so the on-line recursive least square estimation(RLSE) method was employed to modify the model compensation. The projector mapping method was used to condition the RLSE algorithm to bound the parameters estimated. An integral feedback part was added to the traditional robust function to reduce the negative influence of the slow time-varying characteristic of pneumatic muscles and enhance the ability of trajectory tracking. The stability of the controller designed was proved through Laypunov's theory. Various contrast controllers were designed to testify the newly designed components of the CCIARC. Extensive experiments were conducted to illustrate the performance of the controller.

A mobile application framework of the BIM-based facility management system under the cross-platform structure

The building information model/modeling （BIM） technology is currently applied in a broad range of applications and research for facility management, while the BIM-based mobile FM is difficult owing to various factors and environments. For example, the mobile applications usually require frequent cross-equipment compatibility. This paper proposes a reasonable BIM-based FM cross-platform framework and develops a mobile application on the basis of an existing BIM-based FM system. The developed mobile application is applied in a case study of a metro station project in Guangzhou to verify its effectiveness in FM practice. It helps maintenance staff in viewing BIMs, accessing related information, and updating maintenance records in a unique platform. The test results demonstrate that the proposed BIM-based cross-platform framework meet the FM application requirements and supports the extension of FM functions.

无人艇-机协同定位起降关键技术与验证

无人艇(USV)单平台执行水面任务易受平台限制,构建无人艇-机跨平台系统能实现平台优势互补。文章通过研究无人艇-机起降及补能技术,实现无人艇-机持久协同作业。首先,针对无人机(UAV)在动态USV上起降问题,开展无人艇-机协同定位起降技术研究,研究了无人艇-机速度、位置状态信息动态更新模型,实现了UAV在USV端高精度的起降;其次,针对UAV续航时间短的问题,开展UAV在USV端补能研究,研究了UAV端起降机构和USV端充电网机构,实现了UAV着艇快速补能;最后,在海面验证该无人艇-机跨平台起降补能系统性能,试验结果中,无人艇-机系统能在3.0 m/s的高速运动状态下,实现UAV在USV端的成功降落和补能,满足海上无人艇-机跨平台系统执行任务场景的需求。

A Scalable Method for Cross-Platform Merging of SNP Array Datasets

Single nucleotide polymorphism (SNP) array is a recently developed biotechnology that is extensively used in the study of cancer genomes. The various available platforms make cross-study validations/comparisons difficult. Meanwhile, sample sizes of the studies are fast increasing, which poses a heavy computational burden to even the fastest PC.Here, we describe a novel method that can generate a platform-independent dataset given SNP arrays from multiple platforms. It extracts the common probesets from individual platforms, and performs cross-platform normalizations and summari-zations based on these probesets. Since different platforms may have different numbers of probes per probeset (PPP), the above steps produce preprocessed signals with different noise levels for the platforms. To handle this problem, we adopt a platform-dependent smoothing strategy, and produce a preprocessed dataset that demonstrates uniform noise levels for individual samples.To increase the scalability of the method to a large number of samples, we devised an algorithm that split the samples into multiple tasks, and probesets into multiple segments before submitting to a parallel computing facility. This scheme results in a drastically reduced computation time and increased ability to process ultra-large sample sizes and arrays.

黄-鱼原油管道海对海定向钻穿越技术浅析

海对海定向钻穿越是指定向钻的入、出土点都在海上,管道预制也在海上,可以减少对管线路由上的航道、交叉管缆等设施的影响,并有效保护环境,缩短施工周期,节省投资,满足不断发展的海上管道工程建设需要,市场应用前景广阔。基于此,以2022年的黄泽山—鱼山原油管道海对海定向钻穿越工程为例,介绍海上施工的工艺措施,为今后的海对海定向钻穿越工程积累宝贵经验。

海洋平台GNSS RTK监测数据的CVCEEMDAN-WT-SSA去噪算法

针对GNSS-RTK技术在海洋平台变形位移监测过程中的多路径效应误差与随机噪声,本文提出一种基于交叉证认改进的具有自适应白噪声的完整集成经验模态分解(CVCEEMDAN)、小波阈值(WT)降噪方法及奇异谱分析(SSA)相结合的联合去噪算法。首先对原始信号进行CEEMDAN分解,使用交叉证认方法识别噪声与有效信号IMF分量;然后利用WT和SSA分别对噪声和有效信号分量作去噪处理,重构处理后的信号,获得真实变形监测结果。结果表明:本文算法具有自适应性,且相比EMD、EEMD、CEEMDAN、ACCEEMDAN-WT-SSA算法具有更好的去噪效果,可有效去除海洋平台变形监测中的多路径误差及随机噪声,成功获取真实的监测信号结果。

基于uni-app框架的一部手机管生产APP的开发和应用

随着工业信息技术和互联网技术的不断发展,现在已经进入物联网和5G网络时代,手机、平板电脑等移动终端成为人们必不可少的使用工具,在工厂的生产过程管理中的应用逐渐增强,提高了工厂的管理效率和丰富了工厂的管理手段。一部手机管生产APP就是通过移动应用平台的搭建,将工厂的生产过程数据进行实时展示和统计,通过手机进行展示,方便现场生产人员和工厂各级管理人员及时掌控生产过程数据和运行情况,准确地做出决策和判断,指导工厂生产运行,提高工厂数字化水平。文章着重从APP技术设计、功能设计以及应用效果等方面进行该课题的探讨。

Variance Reduction Technique for Estimating Value-at-Risk based on the Cross - Entropy

Value-at-Risk （VaR） estimation via Monte Carlo （MC） simulation is studied here. The variance reduction technique is proposed in order to speed up MC algorithm. The algorithm for estimating the probability of high portfolio losses （more general risk measure） based on the Cross - Entropy importance sampling is developed. This algorithm can easily be applied in any light- or heavy-tailed case without an extra adaptation. Besides, it does not loose in the performance in comparison to other known methods. A numerical study in both cases is performed and the variance reduction rate is compared with other known methods. The problem of VaR estimation using procedures for estimating the probability of high portfolio losses is also discussed.

First assessment of Noise-Equivalent Sigma-Zero in GF3-02 TOPSAR mode with sea surface wind speed retrieval

Gaofen-3-02(GF3-02)is the first C-band synthetic aperture radar(SAR)satellite with terrain observation with progressive scans of SAR(TOPSAR)imaging mode in China,which plays an essential role in marine environment monitoring.Given the weak scattering characteristics of the ocean,the system thermal noise superimposed on SAR images has significant interference,especially in cross-polarization channels.Noise-Equivalent Sigma-Zero(NESZ)is a measure of the sensitivity of the radar to areas of low backscatter.The NESZ is defined to be the scattering cross-section coefficient of an area which contributes a mean level in the image equal to the signal-independent additive noise level.For TOPSAR,NESZ exhibits the shape of the SAR scanning gain curve in the azimuth and the shape of the antenna pattern in the range.Therefore,the accurate measurement of NESZ plays a vital role in the application of spaceborne SAR sea surface cross-polarization data.This paper proposes a theoretical calculation method for the NESZ curve in GF3-02 TOPSAR mode based on SAR noise inner calibration data and the imaging algorithm.A method for correcting the error existing in the theoretical curve of NESZ is also proposed according to the relationship between sea surface backscattering and wind speed and the same characteristics of target scattering in the overlapping area of adjacent sub-swaths.According to assessment with wide-swath TOPSAR cross-polarization data,the GF3-02 TOPSAR mode has a very low thermal noise level,which is better than−33 dB at the edge of each beam,and controlled below−38 dB at the center of the beam.The two-dimensional reference curves of the NESZ of each beam are provided to the GF3-02 TOPSAR users.After discussing the relationship between normalized radar cross section(NRCS)and wind speed,we provide a formula for NRCS related to wind speed and radar incidence angle.Compared with the NRCS derived from this formula and the NESZ-subtracted NRCS of SAR images,the bias is−0.0048 dB,the Root Mean Square Error is 1.671 dB and the correlation coefficient is 0.939.

联动共创:情境差异下基于播客的跨平台知识交流研究

[研究目的]聚焦情境差异下基于播客的用户跨平台知识交流行为,对其行为规律和特征进行分析,揭示此过程所呈现的跨平台知识共创模式及效果,有助于完善网络平台知识共创机制,为平台及用户提供实践指导。[研究方法]以1 169档播客为研究对象,分别获取垂直类平台150 497条和综合类平台7 494条知识交流数据,并实现跨平台用户对齐,从跨平台用户特征、知识交流主题、情感倾向等方面开展跨平台知识交流前后的比较分析。[研究结论]垂直类播客平台与综合类平台基于跨平台用户实现联动,产生了行为复杂度和内容创新度不同的五类跨平台知识共创模式,提升了播客的知识价值和正向传播效应;跨平台知识共创效果与平台情境差异关联密切,亦存在用户类型差异的影响,其中高影响力生产者用户在跨平台过程中表现出更高的创新性、正向情感倾向性以及跨平台身份表征相似性。

知识交流生态视角下的用户跨平台知识交流行为偏好研究

[目的/意义]从知识交流生态视角出发,探究基于视频资源的用户跨平台知识交流行为偏好规律,为用户利用多平台开展交互、实现高价值知识交流提供有效指导。[方法/过程]通过对齐在B站和微博上进行跨平台知识交流的用户,并获取他们在两个平台发布的全量视频内容7215条和同质化视频的330367条评论文本,基于知识生态系统框架,分别针对知识生产者和知识分解者进行内容发布和评论互动等跨平台知识交流偏好的探究。[结果/结论]知识生产者会在不同平台规律性地发布同质化视频以获得知识消费者更好的互动反馈,且根据平台定位和平台功能差异进行标题差异化展示;跨平台知识交流中,知识分解者的评论互动偏好与平台特性相关。[局限]仅选择B站和微博中高影响力知识生产者群体进行研究,后续研究中可对更为多元的知识交流平台以及更丰富的大众知识生产者行为规律进行拓展分析。

基于fsQCA的事件信息跨平台传播效果影响因素研究

[目的/意义]当前,网络媒体已经成为信息传播的主要渠道。探究事件信息跨平台传播的影响因素对于增强信息传播效果具有重要意义。[方法/过程]文章基于多案例研究提炼出一般性事件的信息跨平台传播模式,旨在为信息发布者优化传播策略、有效应对网络舆情提供理论参考。结合场域理论和假设性新闻图式结构提出事件信息场域,基于注意力分配理论、两级传播理论等构建事件信息跨平台传播影响因素框架,并运用fsQCA方法对30个案例在高覆盖平台数、低覆盖平台数、高传播热度和低传播热度4个结果下的条件组态进行了分析。[结果/结论]发现环境热度是事件信息跨平台传播的关键驱动因素,意见领袖在拓宽传播广度和提高传播热度中发挥重要作用,较少的情节反转有助于控制事件信息跨平台传播效果。非环境热度(反向测量)和非情节反转是低覆盖平台数和低传播热度的必要条件。对于正面事件的信息传播可从避开重大热点事件、营造复杂情节设置、细化传播策略等方面加以改善,对于负面事件可从提高环境热度、实施缓和的情感动员策略、及时回应避免谣言等方面进行干预,避免造成舆情和不良社会影响。

融合跨平台用户偏好与异质信息网络的推荐算法研究

[目的/意义]本文基于跨平台用户的异构大数据,提出一种融合跨平台用户偏好与异质信息网络的推荐算法(CPHAR),对于缓解个性化推荐的稀疏性和冷启动问题具有重要意义。[方法/过程]首先,根据跨平台用户信息构建核心兴趣朋友圈,使用卷积神经网络和自注意力机制捕捉用户在源平台和目标平台中的信息偏好特征;其次,根据核心兴趣网络以及推荐项目之间的关系构建异质信息网络,使用异质图注意力网络模型进行特征聚合;最后,将以上特征嵌入改进后的矩阵分解模型,计算推荐得分。[结果/结论]模型在自主构建的4个跨平台数据集中均表现出优越的性能,本文不仅弥补了推荐领域中跨平台多属性和细粒度数据集的空缺,而且通过引入跨平台特征进一步完善了推荐系统相关的理论与方法体系。

多学科融合背景下综合开放创新化学实验教学体系及平台建设与实践

基于“四新学科”建设需求,根据山东大学多学科特色,基于化学与各学科交叉融合发展趋势,化学实验教学中心构建了多学科融合的综合开放创新化学实验教学体系,并重构中心管理框架,在实验室建设和管理、实验技术队伍建设等方面进行探索,取得了良好的效果。

我国跨境电商服务行业发展趋势研究

近年来,跨境电商服务行业受到了广泛关注。新时期,企业成本结构发生了较大变化、行业合规化趋势愈演愈烈,供需关系也发生了深刻变革。跨境服务商通过跨地区、多平台的形式不断拓宽业务范围,提升服务价值内涵,巩固自身竞争地位。此外,当前TikTok平台的流行和语言障碍的破除为跨境服务商提供了新的发展机遇。相关服务商依托专业资源为跨境卖家创造和传递价值,探索跨境电商共赢模式。同时,服务商还通过创新的技术和服务,为卖家提供更高效、更便捷的服务,帮助卖家降低成本、提高效率。综上,服务商在跨境电子商务领域中扮演着越来越重要的角色,为卖家提供了更多的机会和更好的服务。

产能分享平台企业的盈利模式选择与定价研究

在分享经济背景下,考虑交叉网络外部性效用及平台匹配率,研究产能分享平台的盈利模式选择与定价问题。基于两阶段博弈方法,分析并比较了平台在利润最大化和社会福利最大化条件下选择服务费模式与注册费模式时获得的最大利润。研究发现,在目标时间段内,当平台以利润最大化为目标时,多数情况下选择注册费模式获得的最大利润高于选择服务费模式获得的利润。在特定条件下,也存在平台采取两种盈利模式会获得相同利润的情况。此外,平台最大利润在一定条件下与交叉网络外部性系数和平台对制造能力供应方的匹配率正相关,与对制造能力需求方的匹配率负相关。当平台以社会福利最大化为目标时,选择服务费模式获得的利润高于选择注册费模式时的利润。最后,通过数值算例对上述结果进行了验证。

随动辊压型低应力精密断料教学实验平台开发

为了增强学生对先进成形装备及低应力精密断料技术的理解,开发了随动辊压型低应力精密断料教学实验平台。该实验平台综合利用机械设计、传感器技术及计算机控制技术,将应力集中效应和随动辊压技术引入管料的精密分离断料工序中,设计了管料断面质量评价方法,对带有V型槽的45#钢及304不锈钢管料进行了裂纹可控式低应力精密下料实验,验证了断料效果。该实验平台不仅使低应力断料过程更加直观,还提升了学生对低应力精密成形技术的认识,增强了学生对“机械制造工程基础”“切削原理与刀具”及“先进制造技术”等课程的学习兴趣。

跨区域重症远程协同服务平台设计与应用

目的:建设跨区域重症远程协同服务平台,推动优质医疗资源下沉与均衡分布,探索专科医联体建设新路径。方法:依托5G技术、KVM等技术建设跨区域重症远程协同服务平台。结果:四川大学华西医院重症医学学科与信息中心,联合第三方医学信息服务商共同建设华西医院重症医学学科联盟远程重症协同系统,破解医疗信息跨院安全传输障碍,开发远程监护、远程会诊、远程实操、远程教育、远程质控5大功能模组,服务13省140家成员单位,提供会诊查房约250例/年,教学直播约200场/年。结论:现有通信相关技术可以成功建设跨区域重症远程协同服务平台,保障患者数据安全,提高远程协同效率,实现医疗资源、教学资源共享。