高灵敏度的

So the paper is mainly study the rapid detection of pesticide with electrochemical and solid phase extraction techniques.A Single-sweep polarography was described for the determination of trace dichlorvos with sodium perborate and benzidine. The detection limit and the linear range were 1.0ug /mL and 3.0ug/L~7.5mg/mL (R2=0.9992) respectively.

利用敌敌畏可以催化过硼酸钠氧化联苯胺反应的特性，建立测定DDVP的单扫描极谱分析方法，此方法的灵敏度高，其对应的线性范围是3.0μg／L～7.5mg／L(R~2=0.9992)，检测限为1.0μg／L。

Talking about the days when he got to Beijing, Xiao Yu was fledgling guy. He was a stranger in flairtending. Flairtending needs not only the skill, but also practitioners' force, patience, sensitivity and pliancy.

谈起刚到北京，晓宇还是个初出茅庐的半大小子，身材都没长开呢，对于调酒这个行当完全陌生，调酒并不仅仅是需要技巧上的灵活，它对人的力量、耐力、灵敏度以及柔韧性的要求相当高。

The precision is improved by selecting the proper frequency and bandwidth, calibrating the initial parameter and compensating the errors. Compared with the conventional method, it has high sensitivity and rapid responsibility. Experimental measurements show that it is fit for practical engineering application.

通过选择合适的测量频率和带宽、对初始参数校准和误差补偿等方法提高了测量的精确度，与传统的倾角仪相比具有很高的灵敏度和响应速度，实验表明可满足实际工程应用要求。

The new method has higher sensitivity and better selectivity, which was used to determine water and satisfying results were obtained.

新方法具有较高的灵敏度、较好的选择性，在水的测定中获得满意的结果。

Simulation results prove that so long as both busbar stray capacitance and sampling frequency satisfy a certain condition, the proposed scheme can judge the fault accurately under various fault conditions. The proposed scheme possesses good selectivity and strong ability of anti-transition resistance, besides, it is more sensitive to the fault occurred at the end of transmission line.

仿真试验表明，只要母线杂散电容和采样频率满足一定的条件，该方法在各种故障条件下均能准确判断故障，具有很好的选择性，并且有很强的抗过渡电阻能力，对末端短路故障的反应灵敏度更高。

Result The detection limit of the two systems were 0.1fg, equal to 2.31×10^4 copies, which was 10^2-10^3 fold higher than conventional PCR. By the constructed detection systems, the TCK and Tilletia cariesTul could be distinguished. The teliospore and mycelium of TCK in the infected wheat plant tissue also could be identified accurately and rapidly.

建立的两套定量PCR检测体系的检测下限相当，可达到0.1fg，对应的拷贝数为2.31×10^4个，检测灵敏度比常规PCR高2~3个数量级，均可成功鉴别出TCK与小麦网腥黑穗病菌Tilletia caries (DC Tul， TCT，并可快速准确检测小麦矮腥黑穗菌冬孢子和检测罹病小麦植株体内的侵染菌丝体。

The RRS intensity was enhanced obviously after the drugs and DNA reacting with each other, which indicated the formation of new products for the maximum peak appeared at around 375 nm with slight red shift. Then the Cu ion was added into the system to form a ternary system, and the RRS intensity was enhanced significantly, when the enhanced spectral value was directly proportional to the concentration of the DNA. Thus a highly sensitive method could be obtained for determining DNA and the detection limit of the experiment reached 9.7 ng/mL for the RFSV system.

两者反应形成结合产物后其RRS明显增强，并在375 nm左右出现最大散射峰，且有不同程度的红移和散射增强，说明两者结合成新的产物；加入Cu2＋离子后， Cu2＋与利福霉素抗生素及DNA形成三元复合物，此时将导致RRS进一步剧增，而且RRS光谱增强值与DNA浓度呈正比，因而可用于DNA测定具有较高的灵敏度，实验对ctDNA的检出限为9.7 ng/mL (RFSV-Cu2＋- ctDNA体系)。

objective to determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of edaravone, by gas chromatography.methods sample solution was injected on a gdx column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.the residue was calculated by the external standard method.results the linearity was good over the range of 25 μg/ml～400 μg/ml,with the correlation coefficient of acetone being 0.996 and the average recovery 96.8%.conclusions the method was proved to be simple,rapid,practical and highly sensitive.it is an efficient method for the quality control of acetoacetic ester.

摘要］ 目的：用气相色谱法测定依达拉奉合成起始原料乙酰乙酸乙酯中丙酮的残留量。方法：采用固定相为二乙烯苯乙基乙烯苯型高分子多孔小球（直径为0.18 mm～0.25 mm），氮气为载气，用外标法测定乙酰乙酸乙酯中残留丙酮的含量。结果：该方法在丙酮浓度范围在25 μg/ml～400 μg/ml内呈良好的线性关系，响应曲线相关系数为0.996，平均回收率为96.8%。结论：本法简便，快速、实用，灵敏度高，可有效地用于乙酰乙酸乙酯的质量控制。

Through computer simulation of azeotropy rectification dehydration tower with benzene as entrainer, the optimal technical parameters were obtained as follows:①the output quantity of top tower was 69 kg／h, return benzene phasor as 58 kg／h and reflux ratio as 3, alcohol concentration in charge the higher the better, however, its maximum value influenced by water content at azeotropy point;②sensitivity analysis results indicated that the sensitivity of output quantity of top tower was the highest, alcohol concentration in charge the second and return benzene phasor and reflux ratio the lowest.

对以苯作为夹带剂的共沸精馏脱水塔进行了计算机模拟，得到了最佳工艺参数：①塔顶采出量为69 kg／h，返回苯相量为58 kg／h，回流比为3，进料乙醇浓度越高越好，但其最大值受共沸点水含量的影响。②敏感性分析的结果为塔顶采出量的灵敏度最大，进料乙醇浓度次之，而返回苯相量和回流比较小。

BAW is used to on-line monitor the effluent from IC column.

在实际中，以SPQC-BAW技术对离子色谱流出物进行在线监测，可得到响应信号为频率的色谱图，具有很高的灵敏度；利用本室设计的频率/电压转换电路可将频率数字信号转化为模拟电压信号，从而为常用的色谱工作站或色谱数据处理设备接收、利用和处理，实现IC-BAW自动化分析。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐