期刊文献+
共找到29,087篇文章
< 1 2 250 >
每页显示 20 50 100
激光检测药用蒙脱石粒度的方法 预览
1
作者 柳青 陈超 +1 位作者 杨辑 王海水 《中国粉体技术》 CAS CSCD 2020年第1期41-45,共5页
为解决蒙脱石因吸水膨胀、层状结构在剧烈环境条件下易破碎造成的测试精密度不理想的问题,分别考察超声时间、搅拌时间、搅拌速率和分散时间对颗粒粒度检测结果的影响,建立具有良好精密度的激光散射检测方法。结果表明:超声、长时间高... 为解决蒙脱石因吸水膨胀、层状结构在剧烈环境条件下易破碎造成的测试精密度不理想的问题,分别考察超声时间、搅拌时间、搅拌速率和分散时间对颗粒粒度检测结果的影响,建立具有良好精密度的激光散射检测方法。结果表明:超声、长时间高转速搅拌不适合分散蒙脱石颗粒;搅拌1 min,并在2 min内完成测量,搅拌速率控制在450~1600 r/min之间,能够获得重复性良好的检测结果;与扫描电子显微镜测试进行对比,两者结果相近。 展开更多
关键词 蒙脱石 激光散射法 粒度分析 精密度
在线阅读 下载PDF
基于嵌入式和图像处理技术的精准自动施药平台研究 预览
2
作者 刘英 黄凤辉 《农机化研究》 北大核心 2020年第5期221-225,共5页
介绍了精准自动施药平台的结构及HSI颜色模型,并利用直方图均衡化处理、中值滤波和迭代阈值算法等图像处理技术,实现了杂草目标和背景的分离,从软硬件两方面设计了精准自动施药平台嵌入式控制系统。测试结果表明:精准自动施药平台准确... 介绍了精准自动施药平台的结构及HSI颜色模型,并利用直方图均衡化处理、中值滤波和迭代阈值算法等图像处理技术,实现了杂草目标和背景的分离,从软硬件两方面设计了精准自动施药平台嵌入式控制系统。测试结果表明:精准自动施药平台准确率达到了91.5%以上,说明该平台具有很高的喷药精度和稳定性,能够满足对果园除草喷药的要求。 展开更多
关键词 自动施药 HSI 精准 图像处理 嵌入式
在线阅读 下载PDF
Global precision analysis of carrier phase relative positioning in BeiDou navigation satellite system and United States global positioning system
3
作者 Letao ZHOU Dingfa HUANG +3 位作者 Wei FENG Wu CHEN Xi ZHANG Li YAN 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2019年第4期733-749,共17页
In this paper, we derived a high-efficiency formula for calculating the precision of carrier phase relative positioning,analyzed the various factors that affect the positioning accuracy using the carrier phase, and pr... In this paper, we derived a high-efficiency formula for calculating the precision of carrier phase relative positioning,analyzed the various factors that affect the positioning accuracy using the carrier phase, and proposed the concept of using a frequency dilution of precision to describe the quantitative effect of different frequency combinations on the positioning precision. To this end, we computed and plotted the global spatial distribution map of the relative positioning dilution of precision for single-day solution, half-hour solution, and single-epoch solution of the global positioning system(GPS), regional Beidou navigation satellite system(BDS2), future global Beidou navigation satellite system(BDS3), and their fusion systems.Using processing software with autonomous intellectual property rights(GCN and VENUS/ARSNet), we solved the measurement data and examined the positioning precision of the single-day solution and single-epoch solution of GPS and BDS2.The analysis demonstrated that the B1/B2 frequency positioning precision of BDS2 was better than that of L1/L2 frequency positioning of GPS, but the positioning precision of the BDS2 is worse than that of GPS over most of the service region of the BDS2. Further, the positioning precision of BDS3 is better than that of GPS in the Asia-Pacific region, while it is the opposite in other regions. Based on these conclusions, we put forth some optimization recommendations regarding the signal frequency of the navigation system and GPS measurement standards to serve as references for optimizing the system performance and formulating standards. 展开更多
关键词 BEIDOU navigation satellite system RELATIVE POSITIONING DILUTION of PRECISION Frequency DILUTION of PRECISION Spatial-temporal AVAILABILITY
Analysis of the Precision of Bispectral Estimation Methods 预览
4
作者 Wenbing Wu 《现代非线性理论与应用(英文)》 2019年第3期62-71,共10页
In order to evaluate the accuracy of bispectral estimation method, signals of cosine function were adopted. Because the cosine signals’ three order moment spectrum and three order cumulant spectrum are zero, Non zero... In order to evaluate the accuracy of bispectral estimation method, signals of cosine function were adopted. Because the cosine signals’ three order moment spectrum and three order cumulant spectrum are zero, Non zero part of the bispectrum estimated by no matter which method is the estimation error. Through the comparison of three kinds of estimation methods: the direct method, indirect method and AR parameter method, errors of various estimation methods were obtained, then changing the values of different parameters in all methods, and observing the bispectral error values changes with the parameters, so as to provide a basis for the various bispectrum estimation method and the selection. 展开更多
关键词 HIGH Order MOMENT Bispectral ESTIMATION ERROR PRECISION
在线阅读 免费下载
Method Development and Validation for the Quantification of Acrylamide in Potato Chips and Other Locally Available Food by LC-MS/MS in Bangladesh 预览
5
作者 Mala Khan Md. Moniruzzaman Mamudul Hasan Razu 《食品与营养科学(英文)》 2019年第7期876-892,共17页
A sensitive, precise, accurate and simple in house validated Liquid Chromatography and Tandem mass spectrometric (LC-MS/MS) analytical method was developed for the quantification of acrylamide in potato chips, a proba... A sensitive, precise, accurate and simple in house validated Liquid Chromatography and Tandem mass spectrometric (LC-MS/MS) analytical method was developed for the quantification of acrylamide in potato chips, a probable carcinogenic and neurotoxic compound in fried food items. Acrylamide was extracted and cleaned up by QuEChERS method, then analyzed by triple quadrupole mass spectrophotometer using positive electrospray-ionization mode and d3-Acrylamide internal standard. The analyte and internal standard were separated on a reversed-phase C18 column (100 × 2.0 mm, 2.5 μm) by gradient elution with water and methanol containing 0.1% formic acid as mobile phase. The analytical method was fully validated by assessment of linearity, specificity, precision, accuracy, selectivity and robustness with relative standard deviation of less than 4%. The calibration curves were found linear with correlation coefficient (r2) of 0.9997 over the concentration range 5 - 500 μg/L. The recoveries of Acrylamide in the concentration of 250, 400, and 500 μg/L were 97% to 104%. Based on the signal to noise ratio, the lower limit of detection (LOD) and lower limit of quantification (LOQ) were achieved 2.0 μg/L and 4.0 μg/L respectively. The proposed method was also applied to other available most popular 24 types of food (265 number of sample) first time in Bangladesh. The highest level of acrylamide has been found in fried products with the range of 197.04 μg/L to 114.63 μg/L, protein-rich food lies between 79.76 to 89.14 μg/L whereas baked food products exhibited less content in the range of 35.23 to 51.17 μg/L. 展开更多
关键词 LC-MS/MS ACRYLAMIDE LINEARITY Accuracy Precision LOD LOQ
在线阅读 免费下载
空气自动监测仪器精密度、准确度分析 预览
6
作者 张凌玮 《环境科学导刊》 2019年第A02期123-128,共6页
对空气质量自动监测子站二氧化硫、氮氧化物空气自动监测仪器进行了性能检查、精密度与准确度分析。通过分析,判断该设备性能符合中国环境空气质量自动检测技术规范。
关键词 空气自动监测仪器 二氧化硫 氮氧化物 精密度 准确度
在线阅读 下载PDF
基于无人机倾斜摄影的建筑规划验收测量方法探讨 预览
7
作者 赵海强 《地理信息世界》 2019年第3期128-131,共4页
规划验收测量成果是城市规划行政主管部门对已批准建设工程进行规划验收的重要依据。在传统竣工规划验收测量技术基础上,研究采用基于无人机倾斜摄影测量进行规划验收的方法,阐述该方法在建筑规划验收竣工测量中的作业流程,介绍数据采... 规划验收测量成果是城市规划行政主管部门对已批准建设工程进行规划验收的重要依据。在传统竣工规划验收测量技术基础上,研究采用基于无人机倾斜摄影测量进行规划验收的方法,阐述该方法在建筑规划验收竣工测量中的作业流程,介绍数据采集和处理关键技术,并与传统测量方法进行对比分析。结果表明:在本文所讨论的测量条件下,采用无人机倾斜摄影的规划验收测量方法在高程方面具有可行性,受模型精度等影响,平面精度误差存在分布不均匀的情况,尚需进一步研究、改进。 展开更多
关键词 规划验收测量 无人机 倾斜摄影测量 精度
在线阅读 下载PDF
Sequencing XMET genes to promote genotype-guided risk assessment and precision medicine
8
作者 Yaqiong Jin Geng Chen +8 位作者 Wenming Xiao Huixiao Hong Joshua Xu Yongli Guo Wenzhong Xiao Tieliu Shi Leming Shi Weida Tong Baitang Ning 《中国科学:生命科学英文版》 SCIE CAS CSCD 2019年第7期895-904,共10页
High-throughput next generation sequencing (NGS) is a shotgun approach applied in a parallel fashion by which the genome is fragmented and sequenced through small pieces and then analyzed either by aligning to a known... High-throughput next generation sequencing (NGS) is a shotgun approach applied in a parallel fashion by which the genome is fragmented and sequenced through small pieces and then analyzed either by aligning to a known reference genome or by de novo assembly without reference genome.This technology has led researchers to conduct an explosion of sequencing related projects in multidisciplinary fields of science.However,due to the limitations of sequencing-based chemistry,length of sequencing reads and the complexity of genes,it is difficult to determine the sequences of some portions of the human genome,leaving gaps in genomic data that frustrate further analysis.Particularly,some complex genes are difficult to be accurately sequenced or mapped because they contain high GC-content and/or low complexity regions,and complicated pseudogenes,such as the genes encoding xenobiotic metabolizing enzymes and transporters (XMETs).The genetic variants in XMET genes are critical to predicate interindividual variability in drug efficacy,drug safety and susceptibility to environmental toxicity.We summarized and discussed challenges,wet-lab methods,and bioinformatics algorithms in sequencing "complex" XMET genes,which may provide insightful information in the application of NGS technology for implementation in toxicogenomics and pharmacogenomics. 展开更多
关键词 next generation SEQUENCING PRECISION MEDICINE XENOBIOTIC metabolizing enzymes and transporters TOXICOGENOMICS PHARMACOGENOMICS
国产MWP967KV型地基微波辐射计探测精度 预览
9
作者 刘晓璐 刘东升 +2 位作者 郭丽君 雷连发 冯金燕 《应用气象学报》 CSCD 北大核心 2019年第6期731-744,共14页
MWP967KV型地基微波辐射计是我国自主研发,拥有完整自主知识产权的新型大气微波遥感探测设备,为了实现国产设备在气象业务中的应用,需对设备的探测精度进行对比分析。利用2015年8月-2018年3月四川盆地南部山区的无线电探空数据和地基微... MWP967KV型地基微波辐射计是我国自主研发,拥有完整自主知识产权的新型大气微波遥感探测设备,为了实现国产设备在气象业务中的应用,需对设备的探测精度进行对比分析。利用2015年8月-2018年3月四川盆地南部山区的无线电探空数据和地基微波辐射计数据,分析晴空和有云天气条件下温度廓线、相对湿度廓线和水汽密度廓线及相关物理参数的精度。结果表明:晴空、层积云和高积云的微波辐射计与探空仪的温度、水汽密度和相对湿度相关系数整体上分别在0.9890,0.9665,0.5868以上,均达到0.01显著性水平。3种参数廓线的相关系数整体均呈地面大于高空,仅温度廓线相关系数达到0.01显著性水平,相对湿度廓线和水汽密度廓线在高空的相关系数未达到0.01显著性水平。3种参数的相关性整体上温度最高,水汽密度次之,相对湿度最低。温度、相对湿度和水汽密度的均方根误差平均值分别为2.8℃,22%和1.38 g·m^-3,温度廓线和相对湿度廓线在层积云和高积云的云中及云上的精度明显降低,均方根误差较云层下温度升高1℃~2℃,相对湿度增大10%~20%。逆温层会影响廓线及物理参数的精度。晴天或云天等大范围相似天气条件下,探空气球飘移距离与温度廓线、相对湿度廓线和水汽密度廓线偏差的相关性较弱。 展开更多
关键词 地基微波辐射计 /无线电探空 /廓线 /精度
在线阅读 下载PDF
The challenges of precision radiotherapy technology to the traditional theory of radiobiology
10
作者 Ma Shumei Liang Zhenzhen +3 位作者 Chen Qiao Liu Rui Guo Yutian Liu Xiaodong 《中华放射医学与防护杂志》 CAS CSCD 北大核心 2019年第8期563-571,共9页
With the development of modern computing technology and medical physics,radiotherapy has made great progress.The theoretical basis of radiobiology seems to lag behind the clinical application of radiotherapy,which ham... With the development of modern computing technology and medical physics,radiotherapy has made great progress.The theoretical basis of radiobiology seems to lag behind the clinical application of radiotherapy,which hampers the further improvement of treatment efficacy and the optimization of treatment modality.In this paper,some emerging challenges of precision radiotherapy technology to the traditional theory of radiobiology,such as radiosensitivity,dose-response curve and survival curve,linear-quadratic model,4Rs theory,as well as the interaction between cancer and microenvironment,radiation-induced second primary cancers(RISPC),will be discussed.The interplay between precision radiotherapy and traditional radiobiology theories will be addressed with the aim to potentially solve some of the challenging problems. 展开更多
关键词 PRECISION RADIOTHERAPY RADIOBIOLOGY Linear-quadratic model Biological equivalent DOSE RADIOSENSITIVITY
酿酒粮食杂质及不完善粒检验方法的适用性研究 预览
11
作者 怀闪闪 郭乾玲 +4 位作者 董婉婉 丁小亮 张平平 汤有宏 孙珍坤 《酿酒科技》 2019年第5期79-82,共4页
采用《粮油检验粮食、油料的杂质、不完善粒检验》GB/T5494—2008的检验方法,测定酿酒原料的杂质及不完善粒含量。通过不同人员对同一批粮食的杂质、不完善粒进行检测,对比不同人员分析检测结果误差是否符合国标《粮油检验粮食、油料的... 采用《粮油检验粮食、油料的杂质、不完善粒检验》GB/T5494—2008的检验方法,测定酿酒原料的杂质及不完善粒含量。通过不同人员对同一批粮食的杂质、不完善粒进行检测,对比不同人员分析检测结果误差是否符合国标《粮油检验粮食、油料的杂质、不完善粒检验》GB/T5494—2008中要求,验证其方法应用于酿酒原料的杂质及不完善粒含量测定的重复性、准确性、可行性和可靠性,以及确认《粮油检验粮食、油料的杂质、不完善粒检验》在本公司实验室适用且能成功运行。 展开更多
关键词 酿酒原料 杂质 不完善粒 准确度 精密度
在线阅读 下载PDF
板坯连铸机扇形段对弧精度的控制研究
12
作者 刘长伟 《冶金设备》 2019年第A01期32-34,共3页
连铸机扇形段外弧线精度的控制直接关系到铸坯的质量以及后续热轧板的质量,而影响弧度精度的因素包含人员的技能、设备的精度和测量的环境。本文介绍了某钢厂板坯连铸机的主要参数及辐系布置,对扇形段在线对弧的测量方法进行了详细的叙... 连铸机扇形段外弧线精度的控制直接关系到铸坯的质量以及后续热轧板的质量,而影响弧度精度的因素包含人员的技能、设备的精度和测量的环境。本文介绍了某钢厂板坯连铸机的主要参数及辐系布置,对扇形段在线对弧的测量方法进行了详细的叙述.总结出一套完善的扇形段精度的控制方法。 展开更多
关键词 板坯连铸机 弧度 精度 控制方法
特种汽车底盘悬架调平电磁阀泄漏分析 预览
13
作者 王培 李文英 +1 位作者 冯世泽 徐轶群 《液压气动与密封》 2019年第11期79-82,共4页
截止式换向阀是液压系统中常用的元件。在需要精确控制的系统中,截止式换向阀因为其泄漏量小,特别是用于粘度较高的介质时,其泄漏量近似于0,设计人员通常会优先考虑。在实际产品中,截止式换向阀的泄漏故障时有发生,导致系统工作精度下... 截止式换向阀是液压系统中常用的元件。在需要精确控制的系统中,截止式换向阀因为其泄漏量小,特别是用于粘度较高的介质时,其泄漏量近似于0,设计人员通常会优先考虑。在实际产品中,截止式换向阀的泄漏故障时有发生,导致系统工作精度下降甚至瘫痪。 展开更多
关键词 截止式换向阀 泄漏 精度
在线阅读 下载PDF
导板外科应用于下颌骨粉碎性骨折精准复位 预览
14
作者 陆友正 王志勇 +3 位作者 席洪 达明杰 李威 王育新 《口腔医学》 CAS 2019年第8期714-718,共5页
目的探讨应用数字化导板辅助重建钛板精准复位及固定下颌骨粉碎性骨折的方法及效果。方法选取本院2016年1月—2017年12月收治的10例下颌骨粉碎性骨折患者作为研究对象,所有患者术前应用数字化外科技术设计手术导板并行3D打印,术中手术... 目的探讨应用数字化导板辅助重建钛板精准复位及固定下颌骨粉碎性骨折的方法及效果。方法选取本院2016年1月—2017年12月收治的10例下颌骨粉碎性骨折患者作为研究对象,所有患者术前应用数字化外科技术设计手术导板并行3D打印,术中手术导板辅助重建钛板精准复位及固定下颌骨粉碎性骨折,术后行图像融合及临床评价。结果所用患者均一期愈合,图像融合显示与术前虚拟设计偏差度<2 mm,咬合关系恢复及骨折复位愈合情况良好,张口度未见异常。结论数字化导板辅助下颌骨粉碎性骨折复位及固定,缩短了手术时间,能精准复位及固定下颌骨粉碎性骨折,临床应用效果确定。 展开更多
关键词 数字化导板 3D打印 下颌骨粉碎性骨折 精准
在线阅读 下载PDF
燃气内燃机排气流量和排气能量估算方法 预览
15
作者 童航 李国敏 +2 位作者 王宝玉 阮慧锋 孙亮 《华电技术》 CAS 2019年第7期6-9,共4页
针对燃气内燃机出口排气流量和排气能量难以测量的问题,提出了碳平衡法和氧平衡法两种估算方法。以某分布式能源燃气内燃机测试数据为例,对影响其估算精度的各个因素进行分析,得出结论:估算精度主要受烟气成分、天然气流量、CH4含量影响... 针对燃气内燃机出口排气流量和排气能量难以测量的问题,提出了碳平衡法和氧平衡法两种估算方法。以某分布式能源燃气内燃机测试数据为例,对影响其估算精度的各个因素进行分析,得出结论:估算精度主要受烟气成分、天然气流量、CH4含量影响;在烟气成分测量误差相同的情况下,采用碳平衡法估算排气流量和排气能量的误差较氧平衡法小。 展开更多
关键词 燃气内燃机 排气流量 排气能量 碳平衡法 氧平衡法 精度
在线阅读 下载PDF
Reliability Design and Simulation of a Surface-Mount Temperature Compensation Crystal Oscillator
16
作者 SUI Jianping CUI Wei +2 位作者 HASI Tuya ZHENG Wenqiang DUAN Youfeng 《中国航天:英文版》 2019年第2期24-31,共8页
This paper introduces the structure and principle of a surface-mount high-precision temperature compensation crystal oscillator,and specifically describes the reliability design of a quartz-crystal resonator used insi... This paper introduces the structure and principle of a surface-mount high-precision temperature compensation crystal oscillator,and specifically describes the reliability design of a quartz-crystal resonator used inside the surface-mount temperature compensation crystal oscillator,the reliability design of surface-mount ceramic base and the reliability design of hybrid micro-assembly.Finally,the thermal and mechanical simulation results and the experimental verification of this surface-mount temperature compensation crystal oscillator are provided,which prove that this crystal oscillator has high reliability. 展开更多
关键词 temperature COMPENSATION CRYSTAL OSCILLATOR (TCXO) high PRECISION reliability
Characterizing receiver clock behaviors onboard Low Earth Orbiters:A case study of GRACE satellites
17
作者 Tzu-Pang Tseng C.K.Shum Ting-Yi Yang 《大地测量与地球动力学:英文版》 2019年第4期276-281,共6页
Accurate estimation of clocks, for example for the Gravity Recovery And Climate Experiment(GRACE)twin-satellites, is a critical part of precise orbit determination(POD) that ensures temporal gravity inversion. Charact... Accurate estimation of clocks, for example for the Gravity Recovery And Climate Experiment(GRACE)twin-satellites, is a critical part of precise orbit determination(POD) that ensures temporal gravity inversion. Characterizing the periodic variations of the receiver clocks is critical for precise clock modeling and prediction. In this study, the receiver clock is estimated using two different POD procedure: kinematic and reduced-dynamic approaches. Choices and the number of orbital parameters estimated in POD process affect the clock estimates, e.g., there are 8895 and 34,560 total parameters in the reduced-dynamic and kinematic approaches, respectively. In the both cases, the periodic variations of GRACE receiver clock are mainly dominated by the GPS orbit period, as well as once-(1-pr) and twiceper-revolution(2-pr) effects. Here the 1-pr effect is coupled with the relativistic effect, resulting in a difficulty to separate both signals. The clock amplitudes caused by the GPS orbit period, 1-pr and 2-pr are about 0.1, 0.03 and 0.01 ns, respectively. The GPS orbit period is almost one order magnitude larger than the 1-and 2-pr effect. The 0.1-ns amplitude of the 12-h periodic variation is equivalent to a 3-cm error in range. Such a systematic error should be considered in the receiver clock modeling for both the improvement of positioning accuracy and the reduction of number of unknown parameters, if the precise point positioning(PPP) technique is used for the orbit determination of the GRACE. 展开更多
关键词 GPS GRACE Precision ORBIT determination CLOCK modeling
间歇定点精量水稻侧深施肥方法及装置的设计研究 预览
18
作者 董晓威 李伟凯 +3 位作者 衣淑娟 朱春艳 陈长海 刘天祥 《黑龙江八一农垦大学学报》 2019年第3期56-63,共8页
针对我国现有水稻施肥方法及施肥装置,提出一种间歇式定点精量的施肥农艺方法,并进行了理论可行性分析。依据水稻侧深施肥新方法的施肥要求,设计了一种间歇式定点施肥装置。该装置与市场保有量大的延吉925B型插秧机配套使用,采用凸轮机... 针对我国现有水稻施肥方法及施肥装置,提出一种间歇式定点精量的施肥农艺方法,并进行了理论可行性分析。依据水稻侧深施肥新方法的施肥要求,设计了一种间歇式定点施肥装置。该装置与市场保有量大的延吉925B型插秧机配套使用,采用凸轮机构驱动排肥部件实现往复运动、依据凸轮轴上的检测信号,经信号控制装置控制伺服电动机带动螺旋搅龙排肥的工作原理,间歇定点精量完成侧深施肥,设计驱动凸轮转速与插秧机的插秧速度等速匹配的精准定位施肥的控制方法。通过机构零部件的设计,机构的三维运动仿真分析检验了驱动凸轮的轮廓合理性,最后利用台架试验对排肥部件参数进行了优化设计。 展开更多
关键词 定点 精量 水稻 施肥方法 装置设计 试验
在线阅读 免费下载
原子吸收法血铅检测的实验室内质量控制探讨 预览
19
作者 康俊辉 《中国继续医学教育》 2019年第19期68-70,共3页
目的做好血铅检测的实验室内质量控制,保证日常检测结果的精密度、准确度及可比性。方法使用博辉BH-2101S型钨舟原子吸收光谱仪测定血铅,在保证仪器正常使用及对仪器做好日常保养的情况下,严格按照操作规程进行标本采集及处理,仪器定标... 目的做好血铅检测的实验室内质量控制,保证日常检测结果的精密度、准确度及可比性。方法使用博辉BH-2101S型钨舟原子吸收光谱仪测定血铅,在保证仪器正常使用及对仪器做好日常保养的情况下,严格按照操作规程进行标本采集及处理,仪器定标,进行质控,检测样本,绘制质控图,分析质控数据,填写质控报表,并定期参加室间质控。结果室内质控数据无失控,批内变异系数符合行业标准(血铅浓度≥100μg/L时,允许最大误差10%,血铅浓度20~100μg/L时,允许最大误差15%),室内质量控制符合要求,同时参加的卫生部室间质控准确率97.9%,达到优秀水平。结论本实验室血铅的检测数据精密度和准确度均符合要求可接受,为临床提供了可靠结果。 展开更多
关键词 钨舟 原子吸收 血铅 检测 室内质控 精密度 准确度
在线阅读 免费下载
地籍测绘中全站仪与CASS6.0的应用 预览
20
作者 刘蔡斌 《工程建设与设计》 2019年第12期263-264,共2页
全站仪与CASS6.0是地籍测绘的主要设备支撑,不仅有助于的地籍测绘效率的提升,更对测绘结果的精准度具有较大的影响。论文在阐述地籍测绘特征的基础上,对全站仪与CASS6.0绘图软件的应用过程展开分析。
关键词 地籍测绘 全站仪 CASS6.0 精准性
在线阅读 下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部 意见反馈