花岗岩Sn-W-Nb-Ta-Rb-Cs-Li成矿作用的研究方法——以滇西南大同山稀土矿区土壤化探异常查证为例

滇西南大同山稀土矿区位于临沧花岗岩中南段,基岩主要为三叠纪黑云母二长花岗岩,属“S”型花岗岩,形成于同碰撞环境。临沧花岗岩分布区为Sn、W、Bi、B、Li、Rb、Cs、Pb、As、Sb高丰度区,在矿区内La-Y-Nb组合异常,但未进行检查。在矿区1∶50 000土壤地球化学调查中,圈定了16个综合异常。异常查证中,在13个综合异常区的半风化—微风化花岗岩中共采集19件化学分析样,分析了与综合异常相关的7种元素(Sn、W、Nb、Ta、Rb、Cs、Li)。本研究中总结了4种方法:(1)经岩石类型分析数值比较,除中粗粒黑云母二长花岗岩(ηγ^(c)T)与Cs_(2)O矿化有较密切关系外,其他岩石类型与矿化无明显关系;(2)通过样品分析数值比较,将样品划分为矿化元素、矿化程度不同的4种类型;(3)通过矿化系数分析,矿区可能存在Sn-W矿化、Rb-Cs矿化;(4)通过成矿系数分析,矿种的平均成矿系数由大至小为Rb_(2)O(0.6929)→Nb_(2)O_(5)(0.1445)→Cs_(2)O(0.0626)→Ta_(2)O_(5)(0.0378)→WO_(3 )(0.0195)→Sn(0.0101)→Li_(2)O(0.0098)。这4种研究方法对研究临沧花岗岩的成矿作用、进行成矿预测有较为重要的指导作用。在地质背景相似的地区寻找相似矿种,也可借鉴本文提出的研究方法。

ICU患者耐碳青霉烯类鲍曼不动杆菌感染危险因素的Meta分析

目的系统评价医院重症监护室患者感染耐碳青霉烯类鲍曼不动杆菌(CRAB)的危险因素。方法检索知网、万方、维普、CBM、ScienceDirect、PubMed等中英文数据库,收集国内外ICU患者发生CRAB感染危险因素病例对照研究、横断面研究及队列研究的相关文献,检索时限从建库至2023年7月1日。完成文献筛选后应用Stata15软件进行Meta分析。结果排除不符合纳入标准文献,最终纳入33篇文献,其中中文文献29篇,英文文献4篇,观察组3538例,对照组9730例。Meta分析结果显示,共有23个危险因素,其中年龄、性别、侵入性操作5个、基础疾病5个,抗生素治疗药物3个,使用抗生素时间、联合使用抗生素、其他药物使用、ICU住院天数、入院评分、意识状态、机械通气时间超过1周及白蛋白含量低。结论通过现有结果分析表明,以上诸多危险因素会引起ICU患者发生CRAB感染。因此,临床科室应结合患者发生感染的相关危险因素进行针对性防治措施,以期减少ICU患者发生CRAB感染的风险。

Identification and Analysis of Multi-tasking Product Information Search Sessions with Query Logs

Purpose： This research aims to identify product search tasks in online shopplng ana analyze the characteristics of consumer multi-tasking search sessions. Design/methodology/approach： The experimental dataset contains 8,949 queries of 582 users from 3,483 search sessions. A sequential comparison of the Jaccard similarity coefficient between two adjacent search queries and hierarchical clustering of queries is used to identify search tasks. Findings： （1） Users issued a similar number of queries （1.43 to 1.47） with similar lengths （7.3-7.6 characters） per task in mono-tasking and multi-tasking sessions, and （2） Users spent more time on average in sessions with more tasks, but spent less time for each task when the number of tasks increased in a session. Research limitations： The task identification method that relies only on query terms does not completely reflect the complex nature of consumer shopping behavior.Practical implications： These results provide an exploratory understanding of the relationships among multiple shopping tasks, and can be useful for product recommendation and shopping task prediction. Originality/value： The originality of this research is its use of query clustering with online shopping task identification and analysis, and the analysis of product search session characteristics.

Application of Task-Oriented Method of Serial Robot for Mechanism Analysis and Evaluation

Revealing the relations among robotic comprehensive performance,configuration,scales and working tasks is the basis to optimize robotic mechanism. Due to the correlation and diversity of the single performance indexes,statistical principles of linear dimension reduction and nonlinear dimension reduction are introduced into comprehensive performance analysis and evaluation for typical serial robot. The robotic mechanism's configuration,scales and task with the best comprehensive performance can be obtained by principal component analysis( PCA) and kernel principal component analysis( KPCA) respectively. The results show that KPCA can reveal the nonlinear relations among different single performance indexes more effectively and provide more comprehensive performance information than PCA. Thus,task-oriented method of serial robot for mechanism analysis and evaluation is proposed,which also provides scientific research basis for the mechanism synthesis and optimum task order.

Task analysis approach based on perceptual control theory

Based on perceptual control theory,a task analysis approach is proposed to describe more accurately user tasks in dynamic environments,which is of more powerful and flexible descriptive ability. Theoretically,a task meta model is established to describe the interactive process in an individual,dynamic,and flexible way.Methodologically,an implementation framework is illustrated to map the user-oriented description into implementation-oriented models,which will be as a technical tool to transform from a task model to a user interface prototype.

A Study on the Task Analysis and Performance Evaluation of Carved Lacquer Craft Inheritors in Novice Stage

The carved lacquer craft,a gem of traditional Chinese crafts,boasts a history of over 2,000 years and features craftsmanship of a superior order.This study attempts to investigate the typical tasks and learning result evaluation of carved lacquer apprentices at the novice stage by the method of qualitative research with 11 carved lacquer craft inheritors of a studio of a carved lacquer master.It is discovered that the design of carved lacquer draft sketches,the design of carved lacquer patterns,and the making and use of carved lacquer tools are typical tasks of novice apprentices,while the modeling and aesthetics of works,carving skills,and the level of interaction with the carved lacquer community are important criteria for evaluating the development of the skills of novice apprentices.

A method for measuring pilot workload based on task analysis

This paper presents a method for measuring pilot workload based on task analysis in order that the cockpit can be designed more reasonably. In addition, a prototype system is developed to use this method for the assessment of pilot workload. The method breaks the pilot's mission into several phases, segments, functions and tasks. And break pilot workload into 6 components using Wickens' 'multi-resource theory', which are vision(V), vision goggles(G), auditory sensation(A), cognitive activity(C), psychomotor activity(P) and kinesthesis(K). All missions consist of those tasks and each task have 6 workload components. The workload components for each task have been acquired by a study on many pilots, so workload can be assessed. A mission analysis database is built, and the prototype system can simulate pilot's flight process and evaluate workload.

An Analysis of Li's Prose The Great Goal with Gee's "the Seven Building Tasks"

This paper,by using the theory of Seven Building Tasks to analyze the Prose The Great Goal2 which was ever analyzed from the perspective of theme and rheme structure,aims to demonstrate the application of the new theory Severn Building Tasks to analyzing an essay,and thus provide a fresh theory and approach for English learners to analyze prose and learn the English language.

Task-Specific Gait Analysis: Faller versus Non-Faller Comparative Study

In this paper, a comparative analysis of walking patterns during different cognitive states is conducted, followed by the classification of our database into Fallers and Non-fallers;by Fallers we describe subjects with repeated falling history. Vertical Ground Reaction Forces (VGRF) acquired from underneath the heel and toes of both feet are processed and analyzed for that endeavor. The subjects underwent three levels of tasks: 1) Single task: Walking at self-selected-speed (MS), 2) Dual task: Walking while performing a verbal fluency task (MF) and 3) Complex Dual task: Walking while counting backwards (MD).The ultimate objective of our research is fall prediction among the elderly by characterizing the variation of time-domain feature of Gait signals. For that, walking VGRF is analyzed and tested for the existence of indicators of the effect of dual task on subject falling susceptibility, whether parametric or pattern-wise analysis. As a result to our work, dual task in Fallers VGRF signals were recognized at 74% while at those non-fallers were recognized at 85%. Most importantly, subjects with history of fall have shown more potential to change the way they walk while performing mathematical cognitive task.

Theoretical Analysis of Task-Based Language Teaching Pedagogy

Since the implementation of English class XinCheng, English teachers actively studying task-based language teaching approach, try to use task-based language teaching in the classroom teaching. This article will combine the implementation of task-based language teaching, and discussed the application of the task-based language teaching in English teaching.

Manufacturing task data chain-driven production logistics trajectory analysis and optimization decision making method

Production logistics(PL)is considered as a critical factor that affects the efficiency and cost of production operations in discrete manufacturing systems.To effectively utilize manufacturing big data to improve PL efficiency and promote job shop floor economic benefits,this study proposes a PL trajectory analysis and optimization decision making method driven by a manufacturing task data chain(MTDC).First,the manufacturing task chain(MTC)is defined to characterize the discrete production process of a product.To handle manufacturing big data,the MTC data paradigm is designed,and the MTDC is established.Then,the logistics trajectory model is presented,where the various types of logistics trajectories are extracted using the MTC as the search engine for the MTDC.Based on this,a logistics efficiency evaluation indicator system is proposed to support the optimization decision making for the PL.Finally,a case study is applied to verify the proposed method,and the method determines the PL optimization decisions for PL efficiency without changing the layout and workshop equipment,which can assist managers in implementing the optimization decisions.

Qualitative analysis for state/event fault trees using formal model checking

A state/event fault tree(SEFT)is a modeling technique for describing the causal chains of events leading to failure in software-controlled complex systems.Such systems are ubiquitous in all areas of everyday life,and safety and reliability analyses are increasingly required for these systems.SEFTs combine elements from the traditional fault tree with elements from state-based techniques.In the context of the real-time safety-critical systems,SEFTs do not describe the time properties and important timedependent system behaviors that can lead to system failures.Further,SEFTs lack the precise semantics required for formally modeling time behaviors.In this paper,we present a qualitative analysis method for SEFTs based on transformation from SEFT to timed automata(TA),and use the model checker UPPAAL to verify system requirements’properties.The combination of SEFT and TA is an important step towards an integrated design and verification process for real-time safety-critical systems.Finally,we present a case study of a powerboat autopilot system to confirm our method is viable and valid after achieving the verification goal step by step.

An Ensemble Methods for Medical Insurance Costs Prediction Task

The paper reports three new ensembles of supervised learning predictors for managing medical insurance costs.The open dataset is used for data analysis methods development.The usage of artificial intelligence in the management of financial risks will facilitate economic wear time and money and protect patients’health.Machine learning is associated withmany expectations,but its quality is determined by choosing a good algorithm and the proper steps to plan,develop,and implement the model.The paper aims to develop three new ensembles for individual insurance costs prediction to provide high prediction accuracy.Pierson coefficient and Boruta algorithm are used for feature selection.The boosting,stacking,and bagging ensembles are built.A comparison with existing machine learning algorithms is given.Boosting modes based on regression tree and stochastic gradient descent is built.Bagged CART and Random Forest algorithms are proposed.The boosting and stacking ensembles shown better accuracy than bagging.The tuning parameters for boosting do not allow to decrease the RMSE too.So,bagging shows its weakness in generalizing the prediction.The stacking is developed using K Nearest Neighbors(KNN),Support Vector Machine(SVM),Regression Tree,Linear Regression,Stochastic Gradient Boosting.The random forest(RF)algorithm is used to combine the predictions.One hundred trees are built forRF.RootMean Square Error(RMSE)has lifted the to 3173.213 in comparison with other predictors.The quality of the developed ensemble for RootMean Squared Error metric is 1.47 better than for the best weak predictor(SVR).

The impact of task characteristics on the performance of nursing teams

Purpose:This study sought to examine the relationship between team task features and team task performance.Team task performance revolved around the team's technical knowledge and the technical core activities of the organization.On the other hand,team task characteristics include task identity,task significance,and task interdependence.Methods:This study involved a total of 300 nursing teams(1436 individual nurses)from seven state hospitals in Peninsular Malaysia.Data were collected using two sets of questionnaires which were initially distributed to 320 teams.One set was given to the team members and another set was given to the team leaders.Of the 320 sets sent out,300 sets were returned.Responses were then combined and aggregated to the team level to get the team's final score.Analyses of the hypotheses were done using Partial Least Squares(PLS)through assessment of the measurement and structural model.Results:Results from the path analysis revealed that of the three dimensions of team task attributes,only task significance was positively and significantly related to team task performance(β=0.076,P>0.05),while task identity(β=0.076,P>0.05)and task interdependence(β=-0.037,P>0.05)were found unrelated to team task performance.Conclusions:This study demonstrated that task significance is important to predict team task performance.Task significance reflects meaningfulness and nobility of tasks,thus elevate the desire to perform better in each assigned task.

Stress-Induced Precipitation of Fineγ'-Phase and Thermodynamics Analysis

The microstructures of a single crystal Ni-base superalloy with [001] orientation were observed by means of TEM. Results showed that the fine γ' particles were precipitated in the γ matrix channels during the tensile deformation of the alloy. Thermodynamics analysis indicated that the solubility of elements M(Al,Ta) within the γ matrix may be changed when the alloy was deformed by the external applied stress. The tensile stress reduced the solubility of elements Al and Ta so as to occur the over-saturation and agglomeration of them, which promoted the precipitation of fine γ'-phase in the γ matrix.

任务导向性训练治疗卒中后患者平衡功能康复效果的meta分析

目的通过meta分析对比任务导向性训练(task-oriented training,TOT)与常规康复训练治疗卒中后患者平衡功能的疗效差异,探讨TOT治疗卒中患者平衡功能的效果。方法计算机检索Embase、PubMed、Cochrane、Web of Science以及中国知网、万方、维普数据库中从建库至2022年12月正式发表的关于TOT对卒中平衡功能影响的随机对照试验。结局指标包括Berg平衡量表(Berg balance scale,BBS)、起立-行走计时测试(timed up and go test,TUGT)、改良Barthel指数(modified Barthel index,MBI)、6分钟步行测试(6 minute walk test,6MWT)以及Fugl-Meyer评定量表下肢部分(Fugl-Meyer assessment-lower extremity,FMA-LE)。由两名研究者独立筛选文献,使用Cochrane偏倚风险评估工具评估文献质量并提取数据,采用RevMan 5.4软件对各项指标进行meta分析。结果本研究共纳入9项随机对照试验,包括474例受试者,其中TOT组238例,对照组(常规治疗)236例。meta分析结果显示,TOT组BBS评分(MD4.11,95%CI2.76~5.45,P<0.001),TUGT评分(MD-3.24,95%CI-4.72~-1.75,P<0.001),MBI评分(MD9.55,95%CI5.05~14.05,P<0.001),FMA-LE评分(MD3.92,95%CI2.50~5.35,P<0.001)与对照组相比,差异均有统计学意义,TOT组的改善更显著。在6MWT方面,TOT组与对照组的改善差异无统计学意义。结论TOT能改善卒中后患者的平衡控制能力,且比常规训练更有效,对患者下肢运动功能、功能灵活性和日常生活活动能力方面也有积极的影响,但对心肺功能无显著影响。

Effectiveness of Group Therapy Based on Transactional Analysis (TA) in Marital Burnout and Forbearance of Female Students

This research is a semi-experimental study (pretest-posttest design with unequal control group). This study aimed to investigate the effectiveness of the group therapy based on transactional analysis in marital burnout and forbearance of married female students. The research on statistical population comprised all married female students studying in humanities subjects in Neishabour Islamic Azad University in the academic year 2015-16. The sample included 24 of these students, who were selected voluntarily and through Random sampling method and were randomly assigned into two experimental and control groups. Measurement tools consisted of Couple Burnout Measure (CBM) and Evans marital forbearance questionnaire. The experimental group received 10 one-half hour sessions of the treatment based on the transactional analysis whereas in the meantime, the control group received nutritional trainings. The results indicated that the therapy based on the transactional analysis had been effective in reducing marital burnout and increasing the forbearance of couples.

Fabrication and analysis of TIG welding-brazing butt joints of in-situ TiB2/7050 composite and TA2

Lightweight hybrid structures of Al MMCs and titanium alloy dissimilar materials have great prospect in the defence industry application. So, it is necessary to join Al MMCs with Ti metal to achieve this structural design. In this work, in-situ Ti B_(2)/7050 composite and TA2 were firstly attempted to join by TIG welding-brazing technique. The result was that the intact welding-brazing butt joint was successfully fabricated. The joint presents dual characteristics, being a brazing on TA2 side and a welding on Ti B_(2)/7050 side. At brazing joint side, ER4043 filler metal effectively wets on TA2 under TIG heating condition,and a continuous interfacial reaction layer with 1 e3 mm is formed at welded metal/TA2 interface. The whole interfacial reaction layers are composed of Ti(Al Si)3 intermetallic compounds(IMCs), but their morphologies at the different regions present obvious distinguishes. The microhardness of the reaction layers is as much as 141 e190 HV. At welding joints side, the fusion zone appears the equixaed crystal structure, and the grain sizes are much smaller than those of welded metal, which is attributed to the effect of Ti B2 particulates from the melted Ti B_(2)/7050 on acceleration formation and inhibiting growth for the new crystal nucleus. The tensile test results show that average tensile strength of the optimal welding-brazing joint is able to achieve 138 MPa. The failure of the tensile joint occurs by quasi-cleavage pattern, and the cracks initiate from the IMCs layer at the groove surface of TA2 and propagate into the welded metal.

Influence Mechanism,Fundamental Tasks and Key Points of the Construction of New Liberal Arts from the Perspective of Management Majors:A Case Study of Tibet

On the basis of combing domestic and foreign related literature and research practice,the influence mechanism of the construction of new liberal arts was analyzed,and the fundamental tasks of the construction of new liberal arts in Tibet were summarized.Based on 173 field questionnaires in Tibet,factor analysis was used to conduct empirical analysis.It is found that the cumulative contribution of the first,second,third and fourth common factor was 24.921%,21.742%,17.331%,and 14.206%,respectively.Professional orientation,the reform of talent training mode,teacher ability,quality and level of the teaching team,curriculum system reform,teaching content reform,education training service,and other evaluation indicators are the key points of the construction of new liberal arts.The research conclusion is that the construction of new liberal arts needs to highlight the"three positions";it is needed to plan and promote various resources to focus on the ability and level of professional teachers’social services;the managers and professional teachers should be the leaders and participants of the innovation of the talent training model respectively.Finally,relevant policy recommendations were put forward.

双重任务训练对轻度认知障碍患者认知功能影响的meta分析

目的 系统评价双重任务训练(DTT)对轻度认知障碍(MCI)患者认知功能的影响。方法 检索中国知网、万方知识服务平台、维普网、中国生物医学文献数据库、Pub Med、Web of Science、Cochrane Library、护理学数据库和EMbase数据库等从建库至2022年11月有关DTT对MCI患者认知功能干预效果的随机对照试验。采用Rev Man 5.4软件进行meta分析。结果 共纳入14篇文献,总计953例患者。Meta分析结果显示,DTT有助于提高MCI患者的简易精神状态检查评分(SMD=0.71,95%CI:0.23~1.20,P=0.004)和蒙特利尔认知评估评分(SMD=1.45,95%CI:0.73~2.17,P<0.001),降低阿尔茨海默病评定量表认知评分(MD=-1.28,95%CI:-2.06~-0.49,P=0.002)。蒙特利尔认知评估评分漏斗图显示无发表偏倚。结论 DTT可有效改善MCI患者的认知功能,但仍需大样本、高质量研究进一步验证。