Identification of refactoring opportunities for source code based on class association relationships

In order to deal with the complex association relationships between classes in an object-oriented software system,a novel approach for identifying refactoring opportunities is proposed.The approach can be used to detect complex and duplicated many-to-many association relationships in source code,and to provide guidance for further refactoring.In the approach,source code is first transformed to an abstract syntax tree from which all data members of each class are extracted,then each class is characterized in connection with a set of association classes saving its data members.Next,classes in common associations are obtained by comparing different association classes sets in integrated analysis.Finally,on condition of pre-defined thresholds,all class sets in candidate for refactoring and their common association classes are saved and exported.This approach is tested on 4 projects.The results show that the precision is over 96%when the threshold is 3,and 100%when the threshold is 4.Meanwhile,this approach has good execution efficiency as the execution time taken for a project with more than 500 classes is less than 4 s,which also indicates that it can be applied to projects of different scales to identify their refactoring opportunities effectively.

Distribution Characteristics of Effective Source Rocks and Their Control on Hydrocarbon Accumulation: A Case Study from the Dongying Sag, Eastern China

The exploration conducted in the Bohai Bay basin, eastern China has demonstrated that the abundant petroleum resources have close affinities to the hydrocarbon kitchen with rich organic matter. A number of oil-generating associations with various characteristics of organic geochemistry and assemblages of multiple reservoir facies are developed due to the multi-center sedimentation, multi-source supply and multi-cycle evolution of filling, which have resulted in the formation of multiple oil and gas accumulation zones of various layers and trap styles. Among them the Paleogene Shahejie Formation is the most important hydrocarbon accumulation combination in the Dongying sag. Heretofore, its proved reserve has reached nearly 1.8×109t, which accounts for more than 90% of the total proved reserves of the Dongying sag. Based on previous studies, more than 600 source rock samples and 186 crude oil samples of the Shahejie Formation, collected from 30 oilfields, have been treated with organic geochemical testing. By combining the sedimentary sequence characteristics and geochemical analysis results, the source rocks of the Shahejie Formation can be divided into three genetic types, i.e. the saline lake facies (the upper ES4, brackish water deep lake facies (the lower ES3) and fresh-water lake facies (the middle ES3), which correspond to the under-filling, balanced-filling and over-filling lake types respectively and represent the three most essential genetic models for source rocks of non-marine fault basins in China. Based on a thorough oil-source correlation, the source rocks of the saline lake and brackish deep lake facies are determined to be the most contributive source rocks in the Dongying sag. Furthermore, by probing into the accumulation of organic matter and hydrocarbon migration pattern, it can be inferred that the hydrocarbons, generated from source rocks of the saline lake facies with relatively low maturity, have mainly accumulated in the uplifted parts of the basin's margin via lateral migration and the reservoirs are dominated by the buried hill and stratigraphic types, while hydrocarbons generated from source rocks of the brackish lake facies are mainly distributed in the basin's center via vertical migration and characterized by forming lithologic reservoirs. Also, the reservoirs located in the transitional belts have complex types and mostly controlled by faults, characterized by block (structural-lithologic) reservoirs, and the crude oils mainly come from source beds of Es31 and Es42 respectively.

Passive Localization of Multiple Sources Using Joint RSS and AOA Measurements in Spectrum Sharing System

In spectrum sharing systems,locating mul-tiple radiation sources can efficiently find out the in-truders,which protects the shared spectrum from ma-licious jamming or other unauthorized usage.Com-pared to single-source localization,simultaneously lo-cating multiple sources is more challenging in prac-tice since the association between measurement pa-rameters and source nodes are not known.More-over,the number of possible measurements-source as-sociations increases exponentially with the number of sensor nodes.It is crucial to discriminate which measurements correspond to the same source before localization.In this work,we propose a central-ized localization scheme to estimate the positions of multiple sources.Firstly,we develop two computa-tionally light methods to handle the unknown RSS-AOA measurements-source association problem.One method utilizes linear coordinate conversion to com-pute the minimum spatial Euclidean distance sum-mation of measurements.Another method exploits the long-short-term memory(LSTM)network to clas-sify the measurement sequences.Then,we propose a weighted least squares(WLS)approach to obtain the closed-form estimation of the positions by linearizing the non-convex localization problem.Numerical re-sults demonstrate that the proposed scheme could gain sufficient localization accuracy under adversarial sce-narios where the sources are in close proximity and the measurement noise is strong.

Explicit Correlation Model of Multi-source Constraints for Re-design Parts with Complex Curved Surface

In precision machining of complex curved surface parts with high performance, geometry accuracy is not the only constraint, but the performance should also be met. Performance of this kind of parts is closely related to the geometrical and physical parameters, so the final actual size and shape are affected by multiple source constraints, such as geometry, physics, and performance. These parts are rather difficult to be manufactured and new manufacturing method according to performance requirement is urgently needed. Based on performance and manufacturing requirements for complex curved surface parts, a new classification method is proposed, which divided the complex curved surface parts into two categories： surface re-design complex curved surface parts with multi-source constraints（PRCS） and surface unique complex curved surface parts with pure geometric constraints（PUCS）. A correlation model is constructed between the performance and multi-source constraints for PRCS, which reveals the correlation between the performance and multi-source constraints. A re-design method is also developed. Through solving the correlation model of the typical paws performance-associated surface, the mapping relation between the performance-associated surface and the related removal amount is obtained. The explicit correlation model and the method for the corresponding related removal amount of the performance-associated surface are built based on the classification of surface re-design complex curved surface parts with multi-source constraints. Research results have been used in the actual processing of the typical parts such as radome, common bottom components, nozzle, et al., which shows improved efficiency and accuracy of the precision machining for the surface re-design parts with complex curved surface.

Reconstruction of the Indigenous Sources of Gold of the Glu-Kharinsky Placer (Kolyma River Basin, Magadan Region, Russia)

A comparative analysis of typomorphic features of gold placers and indigenous sources of gold was carried out for the Glukharinsky ore-placer node (the Nadezhda deposit and Glukharinskoye, Tyomnoye, and Tyi-Jurye ore occurrences). A correlation between fineness of placer native gold and composition of relic minerals preserved inside gold particles was obtained for the first time. This made it possible to establish mineral parageneses of native gold from potential indigenous sources. The study of placer gold fineness in combination with com-position of mineral inclusions allowed us to identify seven types of gold paragenesis: petzite-hessite with a fineness of 855‰, pyrite-polybasite-galena (a fineness of 670‰), bismuth telluride (900‰), cosalite-vikingite (790‰), galena (870‰), glaucodot (950‰), and hydrohematite (840‰). It was also shown that the placer contains the material from ore occurrences of different formation: gold-quartz-porphyry occurrences in granitoids (Au-Te-Bi type) and gold-silver occurrences. The method developed by us allows one to estimate the percentage of each ore source in placer formation.

中国散裂中子源伴生质子辐照实验平台及其技术参数的确定

为了利用负氢离子加速器中伴随产生的质子成分,中国散裂中子源(China Spallation Neutron Source,CSNS)在直线加速器末端建设了伴生质子辐照实验平台(associated protons experimental platform,APEP)。为了确定其性能参数,采用散射测量、束斑照相、同位素活化法等实验方法对伴生质子辐照实验平台的主要参数进行了刻度。实验证实,该辐照平台可以提供的质子能量范围为10~80 MeV,束斑分布均匀,束流强度范围为1.2×10^(7)~4.0×10^(9) cm^(-2)·s^(-1)。伴生质子辐照实验平台运行稳定,每年提供超过5000 h的束流时间,可以满足宇航器件可靠性测试、探测器刻度、辐照育种以及材料抗辐照特性测试等多种应用需求。

中国散裂中子源伴生质子束实验平台及其应用

基于中国散裂中子源(China Spallation Neutron Source,CSNS)建设的伴生质子束实验平台(associated proton beam experiment platform,APEP)主要用于宇航器件及设备的辐照损伤研究。质子能量在10~80 MeV之间连续可调,束流能散小于10%,束斑尺寸和束流流强也能够根据实验需求进行调节。自2021年10月投入运行以来,APEP已经开展了电子元器件辐照损伤实验、探测器标定实验、各类材料辐照损伤研究等百余项多学科实验研究,为我国多学科特别是辐照损伤效应领域的科学研究和应用研究提供了一个重要的质子束实验平台。

基于“伏气学说”探讨新型冠状病毒感染相关糖尿病的病机及防治

[目的]基于“伏气学说”对新型冠状病毒感染相关糖尿病进行中医理论探讨,为其防治拓宽思路。[方法]以“伏气学说”理论为基石,结合古今文献,从病因病机、发病机制及治疗方法等方面,对新型冠状病毒感染相关糖尿病进行分析论述。[结果]“伏气学说”是阐述机体感邪内伏,过时而发的学说,包含治未病和整体观的中医理念。新型冠状病毒感染相关糖尿病是由疫疠邪气、药石之毒伏匿体内,郁久而发的杂病,其潜伏性、易复发性与伏气致病特点具有共通性。其主要病机为湿毒之邪从口鼻入,内陷膜原,流连三焦,散漫不收,郁久化热,耗伤气阴;发病机制主要与胰岛β细胞损伤、炎症因子释放、类固醇药物诱导等有关,皆与“伏气学说”有内在联系。治疗上感染期以扶正祛邪为要,透达膜原,清化三焦,阻止伏邪内生;恢复期则应清热益气养阴与化痰祛瘀并重,及早祛除伏邪,防止病情进展。[结论]伏气与新型冠状病毒感染相关糖尿病发病关系密切,基于“伏气学说”探讨新型冠状病毒感染相关糖尿病,为其临床防治开辟了新的思路。

云南磷酸盐伴生放射性普查成果分析

基于云南省磷酸盐行业企业的伴生放射性普查数据,结合云南磷酸盐资源分布,对云南磷酸盐天然放射性水平进行了统计和分析。结果表明:云南省磷酸盐保有资源储量居全国第2位,磷酸盐企业主要分布于昆明市(占比80%)、玉溪市、曲靖市、昭通市及红河州;云南省磷酸盐γ辐射剂量率监测平均值为152 nGy/h,高出对照点γ辐射剂量率约1倍;放射性核素伴随整个工艺流程均有不同程度的转移;磷酸盐原矿、废石废渣、普钙重钙及废料等固体污染物放射性水平相当,U-Ra基本平衡,U-Th明显偏U,^(232)Th含量较低;磷酸盐原料中,大部分^(238)U和^(226)Ra活度浓度集中在120~300 Bq/kg。

柴达木盆地南翼山油田伴生水特征及来源分析

柴达木盆地在南翼山a、b、c等井发现高产富锂钾硼卤水。为了推进油田伴生水勘查评价及综合开发利用,通过整理地震、测井、测试、分析化验等资料,掌握了南翼山伴生水水质、分布层位、储层特征,利用卤水特征系数、元素相关性、同位素特征等方法,对南翼山油田伴生水元素成因及来源进行了分析。分析认为,该区背斜核部的古近系地层埋藏深、封闭条件好,构造圈闭及地应力条件有利于卤水富集,明确该区油田伴生水为深层封闭环境下的沉积变质成因。卤水的元素特征系数、分布规律及微量离子组成揭示,南翼山油田伴生卤水是大气降水后,淋滤溶解盆地周围岩浆岩、火成岩,经火山热泉补给,汇至古、新近系湖盆中,经蒸发浓缩,封存于地层中的沉积变质卤水。

面向地表覆盖处理服务的知识图谱建模方法研究

随着开放地理空间联盟(Open Geospatial Consortium,OGC)标准的广泛应用,各种地表覆盖处理服务不断涌现,在自然资源调查监测、生态保护修复和防灾减灾等领域发挥了重要的作用。地表覆盖处理服务具有典型的多源异构特点,信息碎片化严重,使得各处理服务之间难以建立有效关联,用户无法有效地获取个性化的处理服务资源。本文提出一种地表覆盖处理服务领域的知识图谱建模方法。首先,构建地表覆盖处理服务知识图谱概念框架;其次,抽取地表覆盖处理服务实体信息并分析服务实体之间的语义关系,构建地表覆盖处理服务知识图谱;最后,开发地表覆盖处理服务知识图谱原型系统,以济南市天桥区黄河流域信息提取为例,进行验证分析。结果表明,通过构建地表覆盖处理服务领域的知识图谱,可有效解决各处理服务之间缺乏关联和信息碎片化的问题,满足用户对服务的个性化选择需求。

统一地址库建设方案研究

以精准到户语义地址为纽带,汇聚融合各政务大数据,为新型智慧城市建设提供鲜活的统一地址库,全面赋能社会治理、城市管理、民生服务等应用。本文从统一地址库的数据结构设计、多源数据标准化处理、地址数据匹配、行业部门数据关联、数据更新等方面,进行了初步的探讨。

水源井伴生气综合利用

渤海某采油平台水源井产液量进入生产污水系统处理达标后回注到地层,随着开采时间的推移,水源井产出物流中的伴生气不断增多,因污水处理系统不具备处理天然气的能力,使得污水系统液位波动剧烈,水源井伴生气通过污水系统外溢和放空,既存在安全隐患,又造成天然气资源浪费,同时制约水源井产能释放。通过对水源井伴生气回收方式进行实验并对气液分离技术进行分析和论证,在水源井至污水流程之间增加伴生气脱气装置,可实现对水源井伴生气的综合回收利用。既保证了污水系统的稳定运行,又实现日回收伴生气1.05×10^(4)m^(3),日增产水量可达950 m^(3),效果显著,实现了“提质增效”与“节能减排”融合发展,具有借鉴意义。

某伴生放射性矿开发利用企业伴生放射性废渣源项调查及治理对策建议

针对伴生放射性矿开发利用过程中,放射性废渣的最终处置去向问题,论文调查了某伴生放射性矿开发利用企业的伴生放射性废渣源项情况,给出了环境管理限值,分析了其污染情况,核算了废物量并提出治理对策建议,以减少放射性废渣对环境造成的污染,并推动伴生放射性矿开发利用企业的发展。

COMPARISON OF LINEAR AND NONLINEAR WAVES ASSOCIATED WITH STEADY-STATE FORCING SOURCES

Low-frequency phenomena in the atmosphere are intimately related to stationary waves and, in a sense, the former may even be viewed as the time-varying part of the quasi-stationary waves themselves, Much attention has been focused on nonlinear interactions in the conceptual study on stationary waves. Linear and nonlinear primitive-equation baroclinic spectral models are adopted to investigate the response of stationary waves to large- scale mechanical forcing and steady-state thermal forcing, both idealized and realistic, followed by calculations of the EP fluxes and three-dimensional wave activity fluxes (Plumb, 1985) for both the linear and nonlinear solu- tions. Results show that when the forcing source grows intense enough to be comparable to the real one, non- linear interaction becomes very important, especially for the maintenance of tropical and polar stationary waves. Care should be taken, however, in using the EP flux and Plumb's 3-D flux for diagnostic analysis of observational data as they are highly sensitive to nonlinear interaction.

多数据源关联规则挖掘算法研究

现行的关联规则挖掘算法大多只针对单一数据源进行挖掘,但在实验应用中,往往碰到多个数据源的情况.前面的工作已经就多数据源的挖掘做了一些基础性的研究,取得了一定的成果.在此提出一个多数据源关联规则挖掘算法,能够较好的解决在多个数据源的情况下,关联规则挖掘中所涉及的问题,并在实验部分验证了此种算法的正确性和效率.

关于辉钼矿中Re含量示踪来源的讨论

对近年来国内已发表的744个辉钼矿Re-Os同位素测年数据进行了汇总,发现所有样品辉钼矿中的Re含量具有混合分布的特征。按照岩性和共生矿物种类对所有数据进行了分类统计分析,结果显示辉钼矿中Re含量（质量分数,下同）与岩性和共生矿物种类存在密切的关系：长英质脉和花岗岩中辉钼矿的Re含量最低,几何平均值分别为7.41×10^-6和7.99×10^-6,多在n×10^-6-n×10^-5;矽卡岩中辉钼矿Re含量中等,几何平均值为58.1×10^-6,多在n×10^-5^-n×10^-4;碳酸岩中辉钼矿Re含量最高,几何平均值为231×10^-6,多在n×10^-4左右。辉钼矿的共生矿物种类影响其Re含量的变化,仅与白钨矿（或黑钨矿）和（或）方铅矿、闪锌矿、自然金和自然银共生时辉钼矿Re含量最低,几何平均值为n×10^-7,多在n×10^-8-n×10^-6;仅与黄铜矿和（或）磁铁矿（或磁黄铁矿）共生时辉钼矿Re含量最高,几何平均值为n×10-4,多在n×10^-5-n×10^-3;同时与黄铜矿（磁铁矿或磁黄铁矿）和白钨矿（或黑钨矿、方铅矿、闪锌矿、自然金和自然银）共生时辉钼矿Re含量处在前两者之间,几何平均值为n×10^-6,多在n×10^-7-n×10^-5。综合分析说明,辉钼矿与白钨矿（或黑钨矿、方铅矿、闪锌矿、自然金和自然银）共生或产在长英质脉和花岗岩中可能促使其Re含量降低,与黄铜矿、黄铁矿和磁铁矿（或磁黄铁矿）共生或产在矽卡岩和碳酸岩中可能促使其Re含量升高,辉钼矿Re含量的级数变化可能与其产出状态（岩性和共生矿物种类）密切相关,以及结合近年来辉钼矿Re含量示踪和其他同位素示踪结果间矛盾的存在,认为辉钼矿Re含量的级数变化似乎不能有效地反映出其成矿物质来源。

板桥凹陷沙三段沉积体系与物源分析

板桥凹陷位于黄骅坳陷中北部 ,老第三系沙河街组沙三段是主要生储油岩系。根据沉积环境、沉积特征及重矿物组合分布 ,板桥凹陷沙三段沉积期在湖盆的陡岸发育扇三角洲—深水浊积扇—深湖沉积体系以及近岸水下扇—深湖沉积体系 ,不同的物源区通过边界断层的运动控制着沉积体系的发育。在盆地的裂陷兴盛期 ,北部燕山褶皱带物源经过北塘凹陷和海河断层 ,于长芦一带形成扇三角洲 ,并进一步向板桥凹陷中央推进 ,形成板桥深水浊积扇沉积体 ;西北部的沧县隆起物源则沿着不同的入口 ,在沧东大断裂下降盘形成近岸水下扇和扇三角洲 ,它们也可进一步向凹陷深处推进而形成深水浊积体。应用沉积体系分布与油气聚集的规律 ,处于沉积体系的中间相带的扇三角洲和深水浊积扇 ,具有良好的油气生储盖组合 ,是断陷湖盆中有利的勘探目标。

重庆大佛岩铝土矿床地质特征、矿床成因及伴生矿产综合利用

重庆大佛岩铝土矿床位于渝南—黔北成矿带内。铝土矿含矿岩系分布在二叠系栖霞组灰岩或二叠系梁山组炭质页岩之下、志留系韩家店组粉砂质页岩或石炭系黄龙组灰岩之上,为一套含铝黏土岩组合,矿体一般在含矿岩系中部,平面上连续分布;矿石以土状和致密状铝土矿为主,含少量砾屑状和土豆状铝土矿;矿石矿物主要由硬水铝石组成,次为高岭石。通过对含矿岩系微量以及稀土元素的分析,认为重庆大佛岩铝土矿床主要是在弱酸性、氧化环境中形成的具陆相沉积特点的铝土矿床,铝土矿物源主要来自陆源;从含矿岩系中稀土元素与基底页岩中稀土元素相关系数、稀土元素配分模式曲线来看,成矿物质来源主要为下伏志留系韩家店组粉砂质页岩。大佛岩铝土矿床不仅具丰富的铝土矿资源,同时伴生有REO(rare earth oxides)、Ga、Sc、Li以及V等多种有益元素。铝土矿中伴生Ga、V等的综合利用可同主元素铝的利用结合起来,但REO、Sc、Li等因受到多方制约,目前尚无综合开发利用的可行性。因此在开发铝土矿的同时,开展伴生元素综合利用研究具有重要意义。

中国中西部4种组合类型前陆盆地成藏研究:Ⅰ.油气成藏地质条件分析

前陆盆地是中国重要的油气勘探领域。中国中西部前陆盆地从盆地结构和演化特征可以分为早衰型、改造型、新生型和叠加型等4种组合类型。分别以准西北缘前陆盆地(早衰型)、川西前陆盆地(改造型)、柴北缘冲断带(新生型)和准南前陆盆地(叠加型)为例,探讨了不同类型前陆盆地生储盖等成藏地质条件的差异,并分析了不同组合类型前陆盆地主要烃源岩的热演化过程,其中喜山晚期前陆发育对新生型和叠加型前陆盆地烃源岩演化具有明显的控制作用。