如何选购和识别合格的电子计价秤

当前,电子计价秤已被广泛采用,为了让广大商家和顾客对电子计价秤的基本常识有一个正确的认识,本文着重介绍有关电子计价秤的选购方法和顾客购物时如何识别合格的电子计价秤,以确保商家信誉和维护广大消费者的切身利益.     

基于C8051F350的超市电子计价秤的设计

介绍了基于C8051F350单片机的超市电子计价秤的设计方案,给出了硬件线路结构图及软件程序模块.本系统将称重与计价相结合,具有实用电子秤和收银机双重功能;通过条码扫描器输入货物名称、单价等参数,提高了电子计价秤的使用效率;具有RS485通信功能,便于上位机的管理,实现了网络化管理,在测量精度、灵敏度、稳定性和性价比上有明显改善.     

浅析电子计价称故障原因分析及处理办法

电子计价秤难免会存在质量隐患,为保护广大消费者的合法权益,维护正常的市场经济秩序。因此,必须对电子计价秤故障进行严格的检查,以对故障进行维修排除。     

电子测量的误差分析及修正措施

本文较为详细地介绍了电子测量中测量误差的基本概念和表示方法,分析了电子测量的误差来源及产生的原因,研究修正测量误差的方法并提出相应的修正措施,为减小测量误差,提高测量准确度提供了有效的途径。     

浅谈数字式电子汽车衡偏载误差调整方法

在对电子汽车衡检定时,发现数字式电子汽车衡,可以通过仪表软件自动调整其偏载,一遍加载即可完成偏载调整,免除了打开接线盒行反复手工调试的麻烦,简单方便,提高了工作效率,也提高了电子汽车衡的准确度.     

电阻分压的10KV电子式电压互感器分析

基于电阻分压器的电子式电压互感器的原理、结构和输出信号等与传统的电压互感器有很大不同,其性能主要受电阻特性和杂散电容的影响。本文从等效电路的角度分析了电阻特性和杂散电容对电子式电压互感器测量准确度的影响;利用Ansoft软件包建立分压器的有限元模型对杂散电容进行了计算分析,并根据杂散电容分布对屏蔽罩进行了设计。在理论分析基础上,研制了一台电阻分压式的10KV电子式电压互感器,并进行了准确度测试。     

基于现场总线的铜鼓风炉配料控制系统

为了提高铜鼓风炉配料的准确度,针对铜鼓风炉配料系统的特点,提出了鼓风炉配料计量新模式,根据所加物料类型的不同,对块状物料采用料斗秤静态计量;对湿粉状物料采用全悬浮式的电子皮带秤动态计量。并以此为核心建立起分布式现场总线控制系统,选用性价比高的SIEMENS PLC作为主控制站,由PLC控制给料设备,利用PROFIBUS—DP总线技术将分布的设备连成整体,采用组态软件对系统进行实时监控,实现了微机自动控制,提高了配料的稳定性和准确度。应用结果表明,设计系统能够使鼓风炉配料系统的准确度、实时性、可靠性等方面得到很大的提高。     

电子信息系统感应雷防护技术探析

针对电子信息系统感应雷防护存在的漏洞,分析了感应雷入侵并破坏电子信息系统的机理;列出了感应雷击入侵通道和侵害方式;对避雷针接闪时产生的感应雷进行了详细介绍,并重点阐述了电子信息系统感应雷防护技术,给出了电子信息系统的具体雷电防护措施。     

它激式电子镇流器的设计

它激式电子镇流器由于电感体积小,重量轻,省电,效率高,无闪烁等诸多优点而得到广泛应用。由于它激式与自激式电子镇流器相比具有频率准确度高等优点,因此我选用它激式电子镇流器进行设计。     

车载视频系统中基于半像素级搜索的电子稳像算法

在车载视频监控与通信系统中,摄像机抖动引起图像序列的不稳定,直接影响监控效果。因此,电子稳像技术在车载视频监控与通信系统中的重要性和必要性十分显著。在简单分析了基于整像素级搜索的几种电子稳像算法的准确性和实时性后,改进了基于半像素级搜索的电子稳像算法,仿真实验结果表明改进算法在准确度和实时性上得到一个很好的权衡。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to