The Properties and Measurements of Thoron in Buildings

The sources and characters of thoron 220 Rn in the buildings, the pattern of indoor thoron 220 Rn's concentration and the assessment of hazard which it brings to human being are discussed,and the method of measurement of indoor thoron's concentration is expounded and the measure for reducing thoron 220 Rn in the buildings is also pointed out.     

Application of Self-tuning Models to Air Handling Units for Fault Detection

Building management control systems (BMCS) are widely employed in modern buildings. The huge amount of data available on central stations and outstations provide rich information for fault diagnosis of HVAC systems. An online fault diagnosis method for variable air volume air handling units was presented using self-tuning HVAC component models. The model parameters are tuned online by using a genetic algorithm (GA) which minimizes the error between measured and estimated performance data, so high modeling accuracy is assured. If the error between measured and estimated performance data exceeds preset thresholds, it means the occurrence of faults or abnormalities in the air handling unit system. The statistical method of selecting thresholds also is presented. The fault detection method was tested and validated using data collected from real HVAC systems. The results of validation show that the fault detection method can be integrated in BMCS systems to detect faults in air handling unit systems efficiently.     

The Application of Fuzzy Neural Network in the Detection for Moving Object

A fuzzy neural network(FNN) of detection for moving object based on BP algorithm is described in this paper.The correctness of the FNN in signal detection for moving object and fault diagnosis for instrument is proved by experiments.     

Detection and Diagnosis on Plate Heat Exchanger of an Air Conditioning System of a Theatre in Chongqing

A detection and diagnosis has been performed on the bad effect of the central air conditioning system of a theater,and the site test on the actual operating conditions of the plate heat exchanger has also been proceeded. In this paper, based on the correction of the measured heat transfer obtained by actual measurement,the specified logarithmic mean temperature difference heat transfer rate and the specified flow heat transfer has been obtained. By using the specified heat transfer rate as a comparison and regarded as a basis of judging of the performance of plate heat exchanger. Finally, the corresponding recommendations about the actual operation of plate heat exchanger and the steps of the performance diagnostic has been put forward in this article.     

马铃薯中氟啶胺和霜脲氰残留的同步检测及其储藏稳定性研究

建立应用超高效液相色谱串联质谱法同步检测马铃薯中氟啶胺和霜脲氰的残留分析方法,为制定马铃薯中氟啶胺和霜脲氰的残留标准提供参考。样品采用QuEChERS方法处理,经乙腈提取,PSA+C18净化,质谱多反应监测模式扫描,外标法定量。结果表明,在0.02～1.00 mg/kg添加水平范围内,氟啶胺和霜脲氰在马铃薯样品中平均添加回收率分别为84%～97%和85%～101%,相对标准偏差分别为1.6%～2.9%和2.7%～6.8%。在低于-18 ℃条件下储藏16周的试验期间,氟啶胺和霜脲氰的降解率分别为8%～12%和2%～8%。该方法简便高效,准确可靠,是一种较为实用的检测分析方法。储藏稳定性试验结果表明,氟啶胺和霜脲氰在马铃薯匀浆样中均比较稳定。     

马铃薯A病毒液相芯片快速检测方法的建立

旨在建立可检测马铃薯A病毒(Potato virus A,PVA)的液相芯片快速检测技术,用Primer Premier 5.0软件对GenBank中PVA核苷酸序列进行分析,设计其特异性探针并用生物素标记。探针偶联荧光编码微球后与PVA的PCR产物杂交反应,用液相芯片检测仪检测荧光信号。结果显示该法具有较好的特异性,不与侵染马铃薯的番茄黑环病毒(Tomato black ring virus,TBRV)、马铃薯纺锤块茎类病毒(Potato spindle tuber viroid,PSTVd)、马铃薯Y病毒(Potato virus Y,PVY)及番茄斑萎病毒(Tomato spotted wilt virus,TSWV)反应;检测灵敏度约为10 pg/μL总RNA。该方法可用于PVA的快速检测。     

Gold Nanoparticles Preparation and Application in DNA Detection

Several conventional methods for preparing gold nanoparticles and their features are reviewed,Which are separated into physical metnods. The physical methods include vacuum evaporation,soft landing and laser ablation, and chemical methods the chemical ones have colloidal metheds,crystal species generating metheds,reverse micellar methods,phase transmission and model methods,etc..Gold nanoparticles with different size and shape can be produced by different methods. Peculiar physical and chemical properties of gold nanoparticles make them have wide applications in fields of chemistry, biology and medicine, especially in DNA detection. There are optical, electrochemical and piezoelectric methods for detection of DNA. The sensitivity and detection range of these methods can be significantly improved with the using of gold nanoparticles.     

动物饲料中有害微生物的快速检测方法

饲料中有害微生物病原体的污染影响着饲料全球化自由贸易的发展和动物食品的安全,并成为关注的焦点。主要介绍了饲料中有害微生物的危害及其快速检测方法,为了更好地控制饲料生产和销售全过程的安全,从饲料生产的源头控制有害微生物对动物的危害,进而减少有害微生物通过动物进入人的食物链。     

食品中亚硝酸盐检测的研究进展

亚硝酸盐是食品中重要的检测项目。本文重点介绍了比色法、离子色谱法、催化光度法、核固红共振光散射法、极谱法等食品中亚硝酸盐检测方法的测定原理、检出限及特点,综述了不同检测方法的研究进展。     

传感器在致病菌检测上的应用

生物传感器因其具有灵敏、专一、微量、快速、准确、经济实用的特点,在工业、农业、环境监测及生物医学等领域的生物传感器相继得到开发。它是利用抗原或抗体检测相应的抗体或抗原的一种传感器技术。本文就生物传感器在细菌的应用进行综述性报道,并就其发展进行展望。     

生物传感器在微生物毒素检测中的应用研究

对近年来生物传感器测定微生物毒素的研究进展进行了概括,主要包括在细菌毒素和真菌毒素检测中的应用,并对生物传感器的发展前景作了预测和展望。因生物传感器检测的专一性好、测量快速准确、设备简单,在市场上有极强的竞争力。     

甘薯线虫病品种抗性的PCR检测

根据甜菜抗线虫病基因序列,人工合成了三条上游引物和三条下游引物,从中筛选出一对引物,对11份经抗线虫病常规鉴定的甘薯品种(包括6份高抗,2份抗病,3份感病)进行了PCR检测.结果表明:6份高抗品种和1份抗病品种出现了一条630 bp左右大小的特异片段,而3份感病品种未出现任何条带.这与常规鉴定的结果基本吻合,证明分子检测的可行     

燃烧加热污染空气对超燃冲压发动机性能影响研究

针对燃烧加热地面试验设备存在的工质污染问题,采用数值模拟方法研究了燃烧加热污染空气对氢燃料超燃冲压发动机性能的影响。以飞行马赫数Ma=6.5,当量油气比ER=0.6为计算基准状态,分别对纯净空气和污染空气来流下氢燃料超燃冲压发动机的整机流场和性能进行了对比计算分析。燃烧化学反应模拟采用了改进的H₂/O₂七组分八方程模型,湍流模型为标准的 k-ε模型,并采用直连式燃烧室试验数据进行了数值方法的验证。研究结果表明:(1)相对于纯净空气来流,污染空气来流下的超燃冲压发动机推力和比冲均有所下降。(2)采用酒精燃烧加热器的前提下,来流参数匹配静温、静压、马赫数时,发动机性能与纯净空气来流下的结果最为接近,而匹配总温、总压、马赫数时相差最大。(3)来流参数匹配总焓、静压、马赫数的前提下,采用氢燃烧加热器时发动机性能与纯净空气来流下的结果最为接近,而采用甲烷燃烧加热器时相差最大。      

植物病毒检测技术研究进展

介绍了常用植物病毒的检测方法,包括生物学检测法、电镜技术、血清学方法和分子生物学方法中一些较常用的病毒检测方法,同时对各种方法的优缺点进行了比较。     

The Calculation of Electromagnetic Fields in Sapce Around Lightning Path

This thesis studies mathematical model for calculating electromagnetic fields in space around lightning path.The calculating method which can more exactly calculate the distribution of electrocmagnetic fields in space around lightning path is developed.The results are consistent with results of refereces and simulating test.It supplies references for interference protection desigh of electronics such as computers ect.     

禽蛋安全性检测研究

综述了国内外有关禽蛋安全性检测方面的研究内容及进展,以期为蛋品方面的研究和技术推广应用提供参考。     

马铃薯上PVY、PVS和PLRV的三重RT-PCR检测

根据PVY、PVS和PLRV外壳蛋白(Coat protein,CP)基因序列的保守区域设计各自的引物,利用三重RTPCR技术实现了在同一反应体系中同时扩增出3种病毒产物.PVY、PVS和PLRV扩增产物测序长度均与目的片段的长度相符,分别为781,181,364 bp;各种病毒产物的测序结果同GeneBank中的序列...     

油脂检测技术的发展现状

随着科学技术和检测仪器的发展,多种快速、灵敏、可视化的检测仪器已被广泛运用到对油料和油脂的检测过程中。综述了快速、简便、灵敏、准确的检测技术,主观检测指标客观化的检测技术,油脂品质多指标同时测定技术在国内外油料、油脂检测中应用的最新进展。     

浅议乳品微生物检测技术

乳品微生物检测技术对乳制品的质量安全、营养健康及疾病预防具有重要作用,其方法已由培养水平向分子水平迈进。主要介绍了几种乳品微生物检测的技术及方法,并展望了其检测技术的发展方向。     

黄曲霉毒素的检测技术及预防措施

黄曲霉毒素是危害较大的毒素之一,给食品、饲料和畜牧等行业造成了极大的损失。由于它的强致病性及强致癌性,很早就受到了广大科学家及国际粮农组织的广泛关注。针对黄曲霉毒素的众多检测技术进行了归纳和总结,并比较了优缺点,为更好的检测黄曲霉毒素提供了理论依据。针对黄曲霉毒素的高度毒性,提出防治措施,以期保护公众健康、减少经济损失。