测定时间

Based on the dating of Late Cenozoic strata and lithology changes analyses, it can infer the ages of layer landforms formation and the time of broken planation surface.

通过对晚新生代沉积地层高分辨率的环境磁学研究可进一步捕捉重大的环境变化事件，测定其形成的年代及变化，并推测剥蚀面形成和抬升的时间以及确定这些层状地貌形成的时代，进而推演六盘山和青藏高原构造隆升的历史。

the digitized mapping technique is to combine the field data collection system with the computer assisted mapping system in surveys by computer technology.it aims to realize the information collected and processed digitally and automaticaity.the digitized mapping technique can cut short the working time,lighten the labor intensity and enhance the precision of the productions.the system consists of three parts,such as data input,data processing and data output.the survey-record digitized mapping technique is widely used in the digitized mapping working pattern.for its superiority over traditional plane-table mapping in accuracy and efficiency,the large scale digital mapping is becoming more and more popular.compared with traditional analogue mapping,digital mapping has more quality control pivotai points,and its contents and methods are more complex.with the appearance of new technology gps ,the coordinate of different levels controlling points may be surveyed in high precision and it has been applied widely in topographic survey.the operation process of gps electronic tachometer is introduced and its application in topographic survey is br

计算机应用论文，计算机论文， rtk ，全站仪，数字测图，地形测量， gps论文摘要：数字测图是在测量工作中利用电子计算机技术将野外数据采集系统与内业机助制图系统相结合，其目标是实现信息采集处理的数字化、自动化、信息化。数字测图可以缩短作业时间，减轻劳动强度，提高成果精度。数字测图系统主要由数据输入、数据处理和数据输出3部分组成，数字测图作业模式中测记式数字测图应用最为广泛。大比例尺数字测图正以其测图精度高，成图速度快等优势逐步的取代传统的，以平板仪为主的模拟测图。与传统的模拟测图相比，数字测图的质量控制关键点更多、内容与方法更为复杂。gps 新技术的出现，可以高精度并快速地测定各级控制点的坐标，在地形测量中已得到广泛地应用。本文介绍了gps 配合全站仪的作业流程，简要阐明了其在地形测量中的应用。在利用实测数据成图的过程中，解决一些常见的问题，并给出解决的办法及依据，同时给出一些有益的结论，以适应实际使用的需要。

Methods:43 patients including 10 with mitral stenosis associated aortic regurgitation, 12 with mixed mitral valve lesions and 21 with mixed mitral valve lesions and combined with aortic regurgitation were studied.MVA determinded by (1) two -dimensional echocardiography with a cross-sectional area in the short-axis view (2DE),(2) pressure half-time using formula of 220/PHT,(3) color Doppler flow imaging with a jet cross-sectional area in the short-axis view with planimetry,(4) CDFI with a color jet width at the mitral valve orifice in the apical four-chamber view and long-axis view, assuming an elliptic mitral orifice, compared with the orifice area of excised mitral valve during mitral valve replacement.

材料与方法∶分别用二维超声(2DE)、压差减半时间、彩色多普勒二尖瓣口血流截面积和椭圆形面积法测定43例风湿性心脏病二尖瓣狭窄拟行人工瓣置换术患者的MVA，其中合并主动脉瓣反流 10例，合并二尖瓣反流 12例， 21例，并与手术标本的实测面积相比较。

The optimum conditions for extraction was proved practicable by condition filtration and orthogonal design with supersonic wave method .The results showed that the optimum conditions for extraction to ultrasonic method is : methanol (φ=40,20ml),and 15℃ for 30 min ,this paper has determined nicotine contents that is 23.50mg/g at absorption peak (λ=262nm) by HPLC with an eluent consisting of methanol –potass Phosphate alleciate (pH=3) with the recovery and coefficient of variation are 101.52% and 0.91%.

通过超声波提取方法进行条件筛选和正交化实验，确定了烟草中尼古丁的最佳提取条件，结果表明，超声波最佳条件是：甲醇浓度40%，固液比1：20，提取时间30 分钟，超声温度15℃，用高效液相色谱方法在波长262nm 处测定尼古丁的含量，流动相组成为甲醇：磷酸二氢钾缓冲溶液=10：90，测得烟草中尼古丁的含量为23.50 mg/g，平均回收率为101.52%，相对偏差为0.91%。

The results showed that the most important factors related to the accuracy were the recrystallized potassium persulfate and the sodium hydroxide.

通过试验发现，过硫酸钾、氢氧化钠的纯度是影响测定准确性的最重要因素，其中分析纯AR级的过硫酸钾(K2S2O8)经纯化处理可以降低空白值；消解时间的延长和消解温度增加对提高实验准确性的影响不显著。

In this article, a new analytical method for determination of the content of active manganese dioxide left in waste Zn-Mn battery was proposed by iodimetry combined with potential titration. The influence of reaction time, temperature and the quantity of potassium iodide were investigated.

本文提出结合电位滴定技术用碘量法测定废旧锌锰干电池锰粉中剩余活性二氧化锰含量的新方法，对方法中反应时间、温度、碘化钾用量等影响因素进行试验，确定了最优实验条件。

In order to solve the problem of potassium iodide Ioss in microelements premixed material and find out the optimal coating method,residual rates of potassium iodide of pretreated feeds using different kinds of coating s in different treating times were determined in the paper.

为解决微量元素预混料中碘化钾损失的问题，采用不同包被物对碘化钾进行预处理，测定碘化钾在不同处理下一定时间的留存率，从而找出较优的包被处理方法。

In this study, Chitosan-Poly complex nanoparticles were prepared by template polymerization of acrylic acid in the chitosan solution. The preparation and characterization of CS-PAA nanoparticles including the yields of the nanoparticles, FT-IR spectrum analysis, dynamic light scattering, zeta potential, and morphology of nanoparticles were concentrated in this study. The effects of temperature, weight ratio of CS and PAA, and pH value on the physicochemical properties of nanoparticles were studied.

本研究中，我们以模板聚合法在几丁聚醣（Chitosan， CS）溶液中聚合丙烯酸（Acrylicacid， AA）以制备几丁聚醣－聚丙烯酸复合奈米颗粒并计算其产率，再以傅利叶红外线光谱仪、动态光散射粒径分析仪（Dynamic light scattering， DLS）、表面电位测定仪及穿透式电子显微镜等仪器分析CS－PAA 复合奈米颗粒之性质，以探讨聚合时温度、聚合反应时间、CS 与AA 之重量比，以及介质pH 值对CS－PAA 复合奈米颗粒结构的影响。

The effects of discharge time ,discharge power and pressure on reactor temperature were measured.

测定了不同放电时间与放电功率时反应室温度的变化方程，发现反应室温度变化是影响聚合产物P性质的主要因素之一。

The organic blend acids preparation were supplemented into basal diet of AVIAA chicken by 5 g/kg、10 g/kg 、15 g/kg.The performance,pH in proventriculus and digestibility of nutrition elements were determined.

在饲料中添加不同浓度(5 g/kg、10 g/kg、15 g/kg)的有机复合酸化剂对艾维茵肉仔鸡进行饲养试验，测定了其营养成分的消化率，并在不同饲养时间检测腺胃pH。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。