WorldWideScience

Sample records for lab based liquid

  1. Oxygen quenching in LAB based liquid scintillator and nitrogen bubbling

    CERN Document Server

    Hua-Lin, Xiao

    2009-01-01

    Oxygen quenching effect in Linear Alkl Benzne (LAB) based liquid scintillator (LAB+3g/L POPOP+ 15 mg Bis--MSB) was studied by measuring the light yield as the function of nitrogen bubbling time. it shows that the light yield of fully purged liquid scintillator would increase of nearly 11% in room temperature and room atmosphere pressure. A simple model of nitrogen bubbling was built to describe the relationship between relative light yield (oxygen quenching factor) and bubbling time.

  2. Aging research of the LAB-based liquid scintillator in stainless steel container

    OpenAIRE

    Chen, Hai-tao; Yu, Bo-Xiang; Shan, Qing; Ding, Ya-yun; Du, Bing; Liu, Shu-tong; Zhang, Xuan; Zhou, Li; Jia, Wen-bao; Fang, Jian; Ye, Xing-Chen; HU, Wei; Niu, Shun-Li; Yan, Jia-qing; Zhao, Hang

    2014-01-01

    Stainless steel is the material used for the storage vessels and piping systems of LAB-based liquid scintillator in JUNO experiment. Aging is recognized as one of the main degradation mechanisms affecting the properties of liquid scintillator. LAB-based liquid scintillator aging experiments were carried out in different material of containers (type 316 and 304 stainless steel and glass) at two different temperature (40 and 25 degrees Celsius). For the continuous liquid scintillator properties...

  3. Timing properties and pulse shape discrimination of LAB-based liquid scintillator

    Institute of Scientific and Technical Information of China (English)

    LI Xiao-Bo; XIAO Hua-Lin; CAO Jun; LI Jin; RUAN Xi-Chao; HENG Yue-Kun

    2011-01-01

    Linear Alkyl Benzene (LAB) is a promising liquid scintillator solvent in neutrino experiments because it has many appealing properties.The timing properties of LAB-based liquid scintillator have been studied through ultraviolet and ionization excitation in this study.The decay time of LAB,PPO and bis-MSB is found to be 48.6 ns,1.55 ns and 1.5 ns,respectively.A model can describe the absorption and re-emission process between PPO and bis-MSB perfectly.The energy transfer time between LAB and PPO with different concentrations can be obtained via another model.We also show that the LAB-based liquid scintillator has good (n,γ) and (α,γ) discrimination power.

  4. Aging research of the LAB-based liquid scintillator in stainless steel container

    CERN Document Server

    Chen, Hai-tao; Shan, Qing; Ding, Ya-yun; Du, Bing; Liu, Shu-tong; Zhang, Xuan; Zhou, Li; Jia, Wen-bao; Fang, Jian; Ye, Xing-chen; Hu, Wei; Niu, Shun-li; Yan, Jia-qing; Zhao, Hang; Zhao, Dao-jin

    2014-01-01

    Stainless steel is the material used for the storage vessels and piping systems of LAB-based liquid scintillator in JUNO experiment. Aging is recognized as one of the main degradation mechanisms affecting the properties of liquid scintillator. LAB-based liquid scintillator aging experiments were carried out in different material of containers (type 316 and 304 stainless steel and glass) at two different temperature (40 and 25 degrees Celsius). For the continuous liquid scintillator properties tests, the light yield and the absorption spectrum are nearly the same as that of the unaged one. The attenuation length of the aged samples is 6%~12% shorter than that of the unaged one. But the concentration of element Fe in the LAB-based liquid scintillator does not show a clear change. So the self aging has small effect on liquid scintillator, as well as the stainless steel impurity quenching. Type 316 and 304 stainless steel can be used as LAB-based liquid scintillator vessel, transportation pipeline material.

  5. Lab-on-chip for liquid biopsy (LoC-LB) based on dielectrophoresis.

    Science.gov (United States)

    Mathew, Bobby; Alazzam, Anas; Khashan, Saud; Abutayeh, Mohammad

    2017-03-01

    This short communication presents the proof-of-concept of a novel dielectrophoretic lab-on-chip for identifying/separating circulating tumor cells for purposes of liquid biopsy. The device consists of a polydimethylsiloxane layer, containing a microchannel, bonded on a glass substrate that holds two sets of planar interdigitated transducer electrodes. The lab-on-chip is operated at a frequency that enables dielectrophoretic force to sort cells, based on type, along the lateral direction. The operating frequency ensures attraction force toward the electrodes on cancer cells and repulsion force toward the center of the microchannel on other cells. Initial tests for demonstrating proof-of-concept have successfully identified/separated green fluorescent protein-labelled MDA-MB-231 breast cancer cells from a mixture of the same and regular blood cells suspended in low conductivity sucrose/dextrose medium.

  6. Temperature dependence of the light yield of the LAB-based and mesitylene-based liquid scintillators

    CERN Document Server

    DongMei, Xia; XiaoBo, Li; XiLei, Sun; YaYun, Ding; Li, Zhou; Jun, Cao; Wei, Hu; XingCheng, Ye; HaiTao, Chen; XueFeng, Ding; Bing, Du

    2014-01-01

    We studied the temperature dependence of the light yield of the linear alkyl benzene (LAB)-based and mesitylene-based liquid scintillators. The light yield increases by 23% for both liquid scintillators when the temperature is lowered from $26\\;^{\\circ}$C to $-40\\;^{\\circ }$C, correcting for the temperature response of the photomultiplier tube. The measurements help to understand the energy response of the liquid scintillator detectors. Especially, the next generation reactor neutrino experiments for neutrino mass hierarchy, such as the Jiangmen Underground Neutrino Observatory (JUNO), require very high energy resolution. As no apparent degradation on the liquid scintillator transparency was observed, lowering the operation temperature of the detector to $\\sim4\\;^\\circ$C will increase the photoelectron yield of the detector by 13%, combining the light yield increase of the liquid scintillator and the quantum efficiency increase of the photomultiplier tubes.

  7. Inexpensive DAQ based physics labs

    Science.gov (United States)

    Lewis, Benjamin; Clark, Shane

    2015-11-01

    Quality Data Acquisition (DAQ) based physics labs can be designed using microcontrollers and very low cost sensors with minimal lab equipment. A prototype device with several sensors and documentation for a number of DAQ-based labs is showcased. The device connects to a computer through Bluetooth and uses a simple interface to control the DAQ and display real time graphs, storing the data in .txt and .xls formats. A full device including a larger number of sensors combined with software interface and detailed documentation would provide a high quality physics lab education for minimal cost, for instance in high schools lacking lab equipment or students taking online classes. An entire semester’s lab course could be conducted using a single device with a manufacturing cost of under $20.

  8. Development and Mass Production of a Mixture of LAB- and DIN-based Gadolinium-loaded Liquid Scintillator for the NEOS Short-baseline Neutrino Experiment

    CERN Document Server

    Kim, Ba Ro; Jeon, Eun-ju; Joo, Kyung Kwang; Kim, H J; Kim, Hyunsoo; Kim, Jinyu; Kim, Yeongduk; Ko, Youngju; Lee, Jaison; Lee, Jooyoung; Lee, Moohyun; Ma, Kyungju; Oh, Yoomin; Park, Hyangkyu; Park, Kang-soon; Seo, Kyungmin; Seon, Gwang-Min; Siyeon, Kim

    2015-01-01

    A new experiment, which is called as NEOS (NEutrino Oscillation at Short baseline), is proposed on the site of Hanbit reactors at Yonggwang, South Korea, to investigate a reactor antineutrino anomaly. A homogeneous NEOS detector having a 1000-L target volume has been constructed and deployed at the tendon gallery ~25 m away from the reactor core. A linear alkylbenzene (LAB) is used as a main base solvent of the NEOS detector. Furthermore, a di-isopropylnaphthalene (DIN) is added to improve the light output and pulse shape discrimination (PSD) ability. The ratio of LAB to DIN is 90:10. PPO (3 g/L) and bis-MSB (30 mg/L) are dissolved to formulate the mixture of LAB- and DIN-based liquid scintillator (LS). Then, ~0.5% gadolinium (Gd) is loaded into the LS by using the solvent-solvent extraction technique. In this paper, we report the characteristics of Gd-loaded LS (GdLS) for the NEOS detector and the handling during mass production.

  9. On-line liquid phase micro-extraction based on drop-in-plug sequential injection lab-at-valve platform for metal determination

    Energy Technology Data Exchange (ETDEWEB)

    Mitani, Constantina [Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University, Thessaloniki 54124 (Greece); Anthemidis, Aristidis N., E-mail: anthemid@chem.auth.gr [Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University, Thessaloniki 54124 (Greece)

    2013-04-10

    Highlights: ► Drop-in-plug micro-extraction based on SI-LAV platform for metal preconcentration. ► Automatic liquid phase micro-extraction coupled with FAAS. ► Organic solvents with density higher than water are used. ► Lead determination in environmental water and urine samples. -- Abstract: A novel automatic on-line liquid phase micro-extraction method based on drop-in-plug sequential injection lab-at-valve (LAV) platform was proposed for metal preconcentration and determination. A flow-through micro-extraction chamber mounted at the selection valve was adopted without the need of sophisticated lab-on-valve components. Coupled to flame atomic absorption spectrometry (FAAS), the potential of this lab-at-valve scheme is demonstrated for trace lead determination in environmental and biological water samples. A hydrophobic complex of lead with ammonium pyrrolidine dithiocarbamate (APDC) was formed on-line and subsequently extracted into an 80 μL plug of chloroform. The extraction procedure was performed by forming micro-droplets of aqueous phase into the plug of the extractant. All critical parameters that affect the efficiency of the system were studied and optimized. The proposed method offered good performance characteristics and high preconcentration ratios. For 10 mL sample consumption an enhancement factor of 125 was obtained. The detection limit was 1.8 μg L{sup −1} and the precision expressed as relative standard deviation (RSD) at 50.0 μg L{sup −1} of lead was 2.9%. The proposed method was evaluated by analyzing certified reference materials and applied for lead determination in natural waters and urine samples.

  10. Ionic Liquids and Green Chemistry: A Lab Experiment

    Science.gov (United States)

    Stark, Annegret; Ott, Denise; Kralisch, Dana; Kreisel, Guenter; Ondruschka, Bernd

    2010-01-01

    Although ionic liquids have been investigated as solvents for many applications and are starting to be used in industrial processes, only a few lab experiments are available to introduce students to these materials. Ionic liquids have been discussed in the context of green chemistry, but few investigations have actually assessed the degree of…

  11. Ionic Liquids and Green Chemistry: A Lab Experiment

    Science.gov (United States)

    Stark, Annegret; Ott, Denise; Kralisch, Dana; Kreisel, Guenter; Ondruschka, Bernd

    2010-01-01

    Although ionic liquids have been investigated as solvents for many applications and are starting to be used in industrial processes, only a few lab experiments are available to introduce students to these materials. Ionic liquids have been discussed in the context of green chemistry, but few investigations have actually assessed the degree of…

  12. Sensitive immunoassay-based detection of Vibrio parahaemolyticus using capture and labeling particles in a stationary liquid phase lab-on-a-chip.

    Science.gov (United States)

    Park, Byunghee; Choi, Suk-Jung

    2017-04-15

    In the present study, a method was developed for detection of Vibrio parahaemolyticus based on a stationary liquid phase lab-on-a-chip (SLP LOC). The present SLP LOC comprises a sample chamber, washing chamber, and detection chamber connected by two channels. The method utilizes two types of particles: capture particles (CPs), which are magnetic nanoparticles functionalized with antibody; and labeling particles (LPs), which are silica nanoparticles functionalized with horseradish peroxidase and antibody. Samples were added to the sample chamber with CPs and LPs, forming a CP-bacteria-LP complex, and the complex was transported to the detection chamber containing chromogenic substrate solution. The method allowed the detection of V. parahaemolyticus in the range of 10(1)-10(5)cfu within 45min. Additionally, contamination of oyster samples with V. parahaemolyticus was detected within 2.5h, including 2h of culturing. The present method has the advantage of being highly rapid and facile, and enabling the detection of bacteria with high sensitivity. Moreover, the LOC and LOC processing device used in this method possess simple structures, making the detection process economical and allowing miniaturization. Therefore, the present SLP LOC detection method is potentially useful for in situ determination of food safety.

  13. Shandong University Key Lab of Liquid Structure and Heredity of Materials, Ministry of Education of China

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    @@ In 1995, the Key Lab of Liquid Structure and Heredity of Metals was set up by the approval of Shandong province, but the research work on the liquid structure and heredity of materials started in the last three decades. In 2000, combining the lab of engineering ceramic and the institute of joining technology in Shandong University, the lab was established as Key Lab of Liquid Structure and Heredity of Materials, by the approval of the Ministry of Education.

  14. Automated microfluidic screening assay platform based on DropLab.

    Science.gov (United States)

    Du, Wen-Bin; Sun, Meng; Gu, Shu-Qing; Zhu, Ying; Fang, Qun

    2010-12-01

    This paper describes DropLab, an automated microfluidic platform for programming droplet-based reactions and screening in the nanoliter range. DropLab can meter liquids with picoliter-scale precision, mix multiple components sequentially to assemble composite droplets, and perform screening reactions and assays in linear or two-dimensional droplet array with extremely low sample and reagent consumptions. A novel droplet generation approach based on the droplet assembling strategy was developed to produce multicomponent droplets in the nanoliter to picoliter range with high controllability on the size and composition of each droplet. The DropLab system was built using a short capillary with a tapered tip, a syringe pump with picoliter precision, and an automated liquid presenting system. The tapered capillary was used for precise liquid metering and mixing, droplet assembling, and droplet array storage. Two different liquid presenting systems were developed based on the slotted-vial array design and multiwell plate design to automatically present various samples, reagents, and oil to the capillary. Using the tapered-tip capillary and the picoliter-scale precision syringe pump, the minimum unit of the droplet volume in the present system reached ~20 pL. Without the need of complex microchannel networks, various droplets with different size (20 pL-25 nL), composition, and sequence were automatically assembled, aiming to multiple screening targets by simply adjusting the types, volumes, and mixing ratios of aspirated liquids on demand. The utility of DropLab was demonstrated in enzyme inhibition assays, protein crystallization screening, and identification of trace reducible carbohydrates.

  15. Attenuation length measurements of liquid scintillator with LabVIEW and reliability evaluation of the device

    CERN Document Server

    Gao, L; Ding, YY; Zhou, L; Wen, LJ; Xie, YG; Wang, ZG; Cai, X; Sun, XL; Fang, J; Xue, Z; Zhang, AW; LÜ, QW; Sun, LJ; Ge, YS; Liu, YB; Niu, SL; Hu, T; Cao, J; LÜ, JG

    2013-01-01

    The attenuation length measuring device was constructed by using oscilloscope and LabVIEW for signal acquisition and processing. The performance of the device has been tested with a variety of ways, the test results show that the set-up has a good stability and high precision (sigma/mean reached 0.4 percent). Besides, the accuracy of the measurement system will decrease by about 17 percent if a filter is used. The attenuation length of gadolinium-loaded liquid scintillator (Gd-LS) was measured as 15.10 plus or minus 0.35 m where Gd-LS was heavily used in Daya Bay Neutrino Experiment. In addition, one method based on the Beer-Lambert law was proposed to investigate the reliability of the measurement device, the R-square reached 0.9995. Moreover, three purification methods for Linear Alkyl Benzene (LAB) production were compared in the experiment.

  16. Lab-on-a-Chip Based Protein Crystallization

    Science.gov (United States)

    vanderWoerd, Mark J.; Brasseur, Michael M.; Spearing, Scott F.; Whitaker, Ann F. (Technical Monitor)

    2001-01-01

    We are developing a novel technique with which we will grow protein crystals in very small volumes, utilizing chip-based, microfluidic ("LabChip") technology. This development, which is a collaborative effort between NASA's Marshall Space Flight Center and Caliper Technologies Corporation, promises a breakthrough in the field of protein crystal growth. Our initial results obtained from two model proteins, Lysozyme and Thaumatin, show that it is feasible to dispense and adequately mix protein and precipitant solutions on a nano-liter scale. The mixtures have shown crystal growth in volumes in the range of 10 nanoliters to 5 microliters. In addition, large diffraction quality crystals were obtained by this method. X-ray data from these crystals were shown to be of excellent quality. Our future efforts will include the further development of protein crystal growth with LabChip(trademark) technology for more complex systems. We will initially address the batch growth method, followed by the vapor diffusion method and the liquid-liquid diffusion method. The culmination of these chip developments is to lead to an on orbit protein crystallization facility on the International Space Station. Structural biologists will be invited to utilize the on orbit Iterative Biological Crystallization facility to grow high quality macromolecular crystals in microgravity.

  17. DryLab® optimised two-dimensional high performance liquid chromatography for differentiation of ephedrine and pseudoephedrine based methamphetamine samples.

    Science.gov (United States)

    Andrighetto, Luke M; Stevenson, Paul G; Pearson, James R; Henderson, Luke C; Conlan, Xavier A

    2014-11-01

    In-silico optimised two-dimensional high performance liquid chromatographic (2D-HPLC) separations of a model methamphetamine seizure sample are described, where an excellent match between simulated and real separations was observed. Targeted separation of model compounds was completed with significantly reduced method development time. This separation was completed in the heart-cutting mode of 2D-HPLC where C18 columns were used in both dimensions taking advantage of the selectivity difference of methanol and acetonitrile as the mobile phases. This method development protocol is most significant when optimising the separation of chemically similar chemical compounds as it eliminates potentially hours of trial and error injections to identify the optimised experimental conditions. After only four screening injections the gradient profile for both 2D-HPLC dimensions could be optimised via simulations, ensuring the baseline resolution of diastereomers (ephedrine and pseudoephedrine) in 9.7 min. Depending on which diastereomer is present the potential synthetic pathway can be categorized.

  18. Euronet Lab : a Cloud Based Laboratory Environment

    OpenAIRE

    Correia, Raúl Cordeiro; Fonseca, José Manuel; Donnellan, Andrew

    2012-01-01

    A large number of virtual and remote labs connected to the internet is already available nowadays. However, they usually are isolated and independent systems, unable to cooperate and complement each other. This lack of interconnection and interoperability leads, consequently, to the duplication of efforts in order to develop what could be easily shared and reused. Therefore, the integration of different platforms can speed up the development of virtual labs and downsize the barriers of usi...

  19. A Lab Experiment to Introduce Gas/Liquid Solubility

    Science.gov (United States)

    Fonsecaa, I. M. A.; Almeida, J. P. B.; Fachada, H. C.

    2008-01-01

    A simplified version of a volumetric apparatus for gas/liquid solubility measurements is proposed. The procedure familiarizes undergraduate students with the experimental study of the solubility of a gas in a liquid and contributes to the understanding of this important phase equilibrium concept. The experimental results report the determination…

  20. Preliminary study of light yield dependence on LAB liquid scintillator composition

    OpenAIRE

    Ye, Xing-Chen; Yu, Bo-Xiang; Zhou, Xiang; Zhao, Li; Ding, Ya-yun; Jie, Quan-lin; Niu, Shun-Li; Liu, Meng-Chao; Ding, Xue-Feng; Zhang, Xuan; Zhou, Li; Fang, Jian; Chen, Hai-tao; HU, Wei; Yan, Jia-qing

    2015-01-01

    Liquid scintillator (LS) will be adopted as the detector material in JUNO (Jiangmen Underground Neutrino Observatory). The energy resolution requirement of JUNO is 3%, which has never previously been reached. To achieve this energy resolution, the light yield of liquid scintillator is an important factor. PPO (the fluor) and bis-MSB (the wavelength shifter) are the two main materials dissolved in LAB. To study the influence of these two materials on the transmission of scintillation photons i...

  1. Attenuation length measurements of a liquid scintillator with LabVIEW and reliability evaluation of the device

    Institute of Scientific and Technical Information of China (English)

    GAO Long; YU Bo-Xiang; DING Ya-Yun; ZHOU Li; WEN Liang-Jian; XIE Yu-Guang; WANG Zhi-Gang

    2013-01-01

    An attenuation length measurement device was constructed using an oscilloscope and LabVIEW for signal acquisition and processing.The performance of the device has been tested in a variety of ways.The test results show that the set-up has a good stability and high precision (sigma/mean reached 0.4 percent).Besides,the accuracy of the measurement system will decrease by about 17 percent if a filter is used.The attenuation length of a gadolinium-loaded liquid scintillator (Gd-LS) was measured as 15.10±0.35 m where Gd-LS was heavily used in the Daya Bay Neutrino Experiment.In addition,one method based on the Beer-Lambert law was proposed to investigate the reliability of the measurement device,the R-square reached 0.9995.Moreover,three purification methods for Linear Alkyl Benzene (LAB) production were compared in the experiment.

  2. Attenuation length measurements of a liquid scintillator with LabVIEW and reliability evaluation of the device

    Science.gov (United States)

    Gao, Long; Yu, Bo-Xiang; Ding, Ya-Yun; Zhou, Li; Wen, Liang-Jian; Xie, Yu-Guang; Wang, Zhi-Gang; Cai, Xiao; Sun, Xi-Lei; Fang, Jian; Xue, Zhen; Zhang, Ai-Wu; Lü, Qi-Wen; Sun, Li-Jun; Ge, Yong-Shuai; Liu, Ying-Biao; Niu, Shun-Li; Hu, Tao; Cao, Jun; Lü, Jun-Guang

    2013-07-01

    An attenuation length measurement device was constructed using an oscilloscope and LabVIEW for signal acquisition and processing. The performance of the device has been tested in a variety of ways. The test results show that the set-up has a good stability and high precision (sigma/mean reached 0.4 percent). Besides, the accuracy of the measurement system will decrease by about 17 percent if a filter is used. The attenuation length of a gadolinium-loaded liquid scintillator (Gd-LS) was measured as 15.10±0.35 m where Gd-LS was heavily used in the Daya Bay Neutrino Experiment. In addition, one method based on the Beer-Lambert law was proposed to investigate the reliability of the measurement device, the R-square reached 0.9995. Moreover, three purification methods for Linear Alkyl Benzene (LAB) production were compared in the experiment.

  3. Recent advances in particle and droplet manipulation for lab-on-a-chip devices based on surface acoustic waves.

    Science.gov (United States)

    Wang, Zhuochen; Zhe, Jiang

    2011-04-07

    Manipulation of microscale particles and fluid liquid droplets is an important task for lab-on-a-chip devices for numerous biological researches and applications, such as cell detection and tissue engineering. Particle manipulation techniques based on surface acoustic waves (SAWs) appear effective for lab-on-a-chip devices because they are non-invasive, compatible with soft lithography micromachining, have high energy density, and work for nearly any type of microscale particles. Here we review the most recent research and development of the past two years in SAW based particle and liquid droplet manipulation for lab-on-a-chip devices including particle focusing and separation, particle alignment and patterning, particle directing, and liquid droplet delivery.

  4. Promoting Metacognition in Introductory Calculus-based Physics Labs

    Science.gov (United States)

    Grennell, Drew; Boudreaux, Andrew

    2010-10-01

    In the Western Washington University physics department, a project is underway to develop research-based laboratory curriculum for the introductory calculus-based course. Instructional goals not only include supporting students' conceptual understanding and reasoning ability, but also providing students with opportunities to engage in metacognition. For the latter, our approach has been to scaffold reflective thinking with guided questions. Specific instructional strategies include analysis of alternate reasoning presented in fictitious dialogues and comparison of students' initial ideas with their lab group's final, consensus understanding. Assessment of student metacognition includes pre- and post- course data from selected questions on the CLASS survey, analysis of written lab worksheets, and student opinion surveys. CLASS results are similar to a traditional physics course and analysis of lab sheets show that students struggle to engage in a metacognitive process. Future directions include video studies, as well as use of additional written assessments adapted from educational psychology.

  5. A Simple Inquiry-Based Lab for Teaching Osmosis

    Science.gov (United States)

    Taylor, John R.

    2014-01-01

    This simple inquiry-based lab was designed to teach the principle of osmosis while also providing an experience for students to use the skills and practices commonly found in science. Students first design their own experiment using very basic equipment and supplies, which generally results in mixed, but mostly poor, outcomes. Classroom "talk…

  6. Unmanned Systems: A Lab-Based Robotic Arm for Grasping

    Science.gov (United States)

    2015-06-01

    A LAB-BASED ROBOTIC ARM FOR GRASPING by Arturo Jacinto II June 2015 Thesis Advisor: Richard M. Harkins Second Reader: Peter Crooker......learning opportunities for various student experiments including the initial selection, startup and development of the Robotic arm and glove controller

  7. Preliminary study of light yield dependence on LAB liquid scintillator composition

    CERN Document Server

    Ye, Xing-Chen; Zhou, Xiang; Zhao, Li; Ding, Ya-Yun; Jie, Quan-Lin; Niu, Shun-Li; Liu, Meng-Chao; Ding, Xue-Feng; Zhang, Xuan; Zhou, Li; Fang, Jian; Chen, Hai-Tao; Hu, Wei; Yan, Jia-Qing; Zhao, Hang; Hong, Dao-Jin

    2015-01-01

    Liquid scintillator (LS) will be adopted as the detector material in JUNO (Jiangmen Underground Neutrino Observatory). The energy resolution requirement of JUNO is 3%, which has never previously been reached. To achieve this energy resolution, the light yield of liquid scintillator is an important factor. PPO (the fluor) and bis-MSB (the wavelength shifter) are the two main materials dissolved in LAB. To study the influence of these two materials on the transmission of scintillation photons in LS, 25 and 12 cm-long quartz vessels were used in a light yield experiment. LS samples with different concentration of PPO and bis-MSB were tested. At these lengths, the light yield growth is not obvious when the concentration of PPO is higher than 4 g/L. The influence from bis-MSB becomes insignificant when its concentration is higher than 8 mg/L. This result could provide some useful suggestions for the JUNO LS.

  8. Characterization of aqueous two phase systems by combining lab-on-a-chip technology with robotic liquid handling stations.

    Science.gov (United States)

    Amrhein, Sven; Schwab, Marie-Luise; Hoffmann, Marc; Hubbuch, Jürgen

    2014-11-07

    Over the last decade, the use of design of experiment approaches in combination with fully automated high throughput (HTP) compatible screenings supported by robotic liquid handling stations (LHS), adequate fast analytics and data processing has been developed in the biopharmaceutical industry into a strategy of high throughput process development (HTPD) resulting in lower experimental effort, sample reduction and an overall higher degree of process optimization. Apart from HTP technologies, lab-on-a-chip technology has experienced an enormous growth in the last years and allows further reduction of sample consumption. A combination of LHS and lab-on-a-chip technology is highly desirable and realized in the present work to characterize aqueous two phase systems with respect to tie lines. In particular, a new high throughput compatible approach for the characterization of aqueous two phase systems regarding tie lines by exploiting differences in phase densities is presented. Densities were measured by a standalone micro fluidic liquid density sensor, which was integrated into a liquid handling station by means of a developed generic Tip2World interface. This combination of liquid handling stations and lab-on-a-chip technology enables fast, fully automated, and highly accurate density measurements. The presented approach was used to determine the phase diagram of ATPSs composed of potassium phosphate (pH 7) and polyethylene glycol (PEG) with a molecular weight of 300, 400, 600 and 1000 Da respectively in the presence and in the absence of 3% (w/w) sodium chloride. Considering the whole ATPS characterization process, two complete ATPSs could be characterized within 24h, including four runs per ATPS for binodal curve determination (less than 45 min/run), and tie line determination (less than 45 min/run for ATPS preparation and 8h for density determination), which can be performed fully automated over night without requiring man power. The presented methodology provides

  9. Reference-based pricing: an evidence-based solution for lab services shopping.

    Science.gov (United States)

    Melton, L Doug; Bradley, Kent; Fu, Patricia Lin; Armata, Raegan; Parr, James B

    2014-01-01

    To determine the effect of reference-based pricing (RBP) on the percentage of lab services utilized by members that were at or below the reference price. Retrospective, quasi-experimental, matched, case-control pilot evaluation of an RBP benefit for lab services. The study group included employees of a multinational grocery chain covered by a national health insurance carrier and subject to RBP for lab services; it had access to an online lab shopping tool and was informed about the RBP benefit through employer communications. The reference group was covered by the same insurance carrier but not subject to RBP. The primary end point was lab compliance, defined as the percentage of lab claims with total charges at or below the reference price. Difference-in-difference regression estimation evaluated changes in lab compliance between the 2 groups. Higher compliance per lab claim was evident for the study group compared with the reference group (69% vs 57%; Ponline shopping tool was used by 7% of the matched-adjusted study group prior to obtaining lab services. Lab compliance was 76% for study group members using the online tool compared with 68% among nonusers who were subject to RBP (P<.01). RBP can promote cost-conscious selection of lab services. Access to facilities that offer services below the reference price and education about RBP improve compliance. Evaluation of the effect of RBP on higher-cost medical services, including radiology, outpatient specialty, and elective inpatient procedures, is needed.

  10. Image-based fingerprint verification system using LabVIEW

    Directory of Open Access Journals (Sweden)

    Sunil K. Singla

    2008-09-01

    Full Text Available Biometric-based identification/verification systems provide a solution to the security concerns in the modern world where machine is replacing human in every aspect of life. Fingerprints, because of their uniqueness, are the most widely used and highly accepted biometrics. Fingerprint biometric systems are either minutiae-based or pattern learning (image based. The minutiae-based algorithm depends upon the local discontinuities in the ridge flow pattern and are used when template size is important while image-based matching algorithm uses both the micro and macro feature of a fingerprint and is used if fast response is required. In the present paper an image-based fingerprint verification system is discussed. The proposed method uses a learning phase, which is not present in conventional image-based systems. The learning phase uses pseudo random sub-sampling, which reduces the number of comparisons needed in the matching stage. This system has been developed using LabVIEW (Laboratory Virtual Instrument Engineering Workbench toolbox version 6i. The availability of datalog files in LabVIEW makes it one of the most promising candidates for its usage as a database. Datalog files can access and manipulate data and complex data structures quickly and easily. It makes writing and reading much faster. After extensive experimentation involving a large number of samples and different learning sizes, high accuracy with learning image size of 100 100 and a threshold value of 700 (1000 being the perfect match has been achieved.

  11. Liquid-infiltrated photonic crystals for lab-on-a-chip applications

    DEFF Research Database (Denmark)

    Xiao, Sanshui; Pedersen, Jesper; Mortensen, Niels Asger

    2007-01-01

    In this paper we theoretically discuss how a strongly dispersive photonic crystals environment may be used to enhance the light-matter interactions, thus potentially compensating for the reduced optical path in typical lab-on- a-chip systems. Combining electromagnetic perturbation theory with ful......-wave electromagnetic simulations we address the prospects for slow-light enhancement of Beer-Lambert absorption and photonic band-gap based refractometry.......In this paper we theoretically discuss how a strongly dispersive photonic crystals environment may be used to enhance the light-matter interactions, thus potentially compensating for the reduced optical path in typical lab-on- a-chip systems. Combining electromagnetic perturbation theory with full...

  12. Constructing a LabVIEW-Controlled High-Performance Liquid Chromatography (HPLC) System: An Undergraduate Instrumental Methods Exercise

    Science.gov (United States)

    Smith, Eugene T.; Hill, Marc

    2011-01-01

    In this laboratory exercise, students develop a LabVIEW-controlled high-performance liquid chromatography system utilizing a data acquisition device, two pumps, a detector, and fraction collector. The programming experience involves a variety of methods for interface communication, including serial control, analog-to-digital conversion, and…

  13. Constructing a LabVIEW-Controlled High-Performance Liquid Chromatography (HPLC) System: An Undergraduate Instrumental Methods Exercise

    Science.gov (United States)

    Smith, Eugene T.; Hill, Marc

    2011-01-01

    In this laboratory exercise, students develop a LabVIEW-controlled high-performance liquid chromatography system utilizing a data acquisition device, two pumps, a detector, and fraction collector. The programming experience involves a variety of methods for interface communication, including serial control, analog-to-digital conversion, and…

  14. EXPLOITING THE LANGUAGE LAB: A WAY TO FIT LAB-BASED LISTENING COURSES INTO THE COMMUNICATIVE FRAMEWORK

    Institute of Scientific and Technical Information of China (English)

    1998-01-01

    This paperlanalyzes why the language laboratory still has an important role to play in ELT in China. Two methods of incorporating lab-based courses into a communicative framework, involving classroom interaction patterns and task-based listening materials, are suggested, and a model lesson applying these two methods is presented.

  15. Can Graduate Teaching Assistants Teach Inquiry-Based Geology Labs Effectively?

    Science.gov (United States)

    Ryker, Katherine; McConnell, David

    2014-01-01

    This study examines the implementation of teaching strategies by graduate teaching assistants (GTAs) in inquiry-based introductory geology labs at a large research university. We assess the degree of inquiry present in each Physical Geology lab and compare and contrast the instructional practices of new and experienced GTAs teaching these labs. We…

  16. Can Graduate Teaching Assistants Teach Inquiry-Based Geology Labs Effectively?

    Science.gov (United States)

    Ryker, Katherine; McConnell, David

    2014-01-01

    This study examines the implementation of teaching strategies by graduate teaching assistants (GTAs) in inquiry-based introductory geology labs at a large research university. We assess the degree of inquiry present in each Physical Geology lab and compare and contrast the instructional practices of new and experienced GTAs teaching these labs. We…

  17. The Design of NetSecLab: A Small Competition-Based Network Security Lab

    Science.gov (United States)

    Lee, C. P.; Uluagac, A. S.; Fairbanks, K. D.; Copeland, J. A.

    2011-01-01

    This paper describes a competition-style of exercise to teach system and network security and to reinforce themes taught in class. The exercise, called NetSecLab, is conducted on a closed network with student-formed teams, each with their own Linux system to defend and from which to launch attacks. Students are expected to learn how to: 1) install…

  18. Computer-based Astronomy Labs for Non-science Majors

    Science.gov (United States)

    Smith, A. B. E.; Murray, S. D.; Ward, R. A.

    1998-12-01

    We describe and demonstrate two laboratory exercises, Kepler's Third Law and Stellar Structure, which are being developed for use in an astronomy laboratory class aimed at non-science majors. The labs run with Microsoft's Excel 98 (Macintosh) or Excel 97 (Windows). They can be run in a classroom setting or in an independent learning environment. The intent of the labs is twofold; first and foremost, students learn the subject matter through a series of informational frames. Next, students enhance their understanding by applying their knowledge in lab procedures, while also gaining familiarity with the use and power of a widely-used software package and scientific tool. No mathematical knowledge beyond basic algebra is required to complete the labs or to understand the computations in the spreadsheets, although the students are exposed to the concepts of numerical integration. The labs are contained in Excel workbook files. In the files are multiple spreadsheets, which contain either a frame with information on how to run the lab, material on the subject, or one or more procedures. Excel's VBA macro language is used to automate the labs. The macros are accessed through button interfaces positioned on the spreadsheets. This is done intentionally so that students can focus on learning the subject matter and the basic spreadsheet features without having to learn advanced Excel features all at once. Students open the file and progress through the informational frames to the procedures. After each procedure, student comments and data are automatically recorded in a preformatted Lab Report spreadsheet. Once all procedures have been completed, the student is prompted for a filename in which to save their Lab Report. The lab reports can then be printed or emailed to the instructor. The files will have full worksheet and workbook protection, and will have a "redo" feature at the end of the lab for students who want to repeat a procedure.

  19. Measurement of α-particle quenching in LAB based scintillator in independent small-scale experiments

    Energy Technology Data Exchange (ETDEWEB)

    Krosigk, B. von [Technische Universitaet Dresden, Institut fuer Kern- und Teilchenphysik, Dresden (Germany); University of British Columbia, Department of Physics and Astronomy, Vancouver, BC (Canada); Chen, M.; Liu, X.; Wright, A. [Queen' s University, Department of Physics, Engineering Physics and Astronomy, Kingston, ON (Canada); Hans, S. [Brookhaven National Laboratory, Upton, NY (United States); Bronx Community College, Bronx, NY (United States); Junghans, A.R. [Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Koegler, T. [Technische Universitaet Dresden, Institut fuer Kern- und Teilchenphysik, Dresden (Germany); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Kraus, C. [Queen' s University, Department of Physics, Engineering Physics and Astronomy, Kingston, ON (Canada); Laurentian University, Sudbury, ON (Canada); Kuckert, L. [Technische Universitaet Dresden, Institut fuer Kern- und Teilchenphysik, Dresden (Germany); Karlsruher Institut fuer Technologie, Institut fuer Experimentelle Kernphysik, Karlsruhe (Germany); Nolte, R. [Physikalisch-Technische Bundesanstalt, Braunschweig (Germany); O' Keeffe, H.M. [Queen' s University, Department of Physics, Engineering Physics and Astronomy, Kingston, ON (Canada); Lancaster University, Physics Department, Lancaster (United Kingdom); Tseung, H.W.C. [University of Washington, Department of Physics, Center for Experimental Nuclear Physics and Astrophysics, Seattle, WA (United States); Mayo Clinic, Department of Radiation Oncology, Rochester, MN (United States); Wilson, J.R. [Queen Mary, University of London, School of Physics and Astronomy, London (United Kingdom); Yeh, M. [Brookhaven National Laboratory, Upton, NY (United States); Zuber, K. [Technische Universitaet Dresden, Institut fuer Kern- und Teilchenphysik, Dresden (Germany)

    2016-03-15

    The α-particle light response of liquid scintillators based on linear alkylbenzene (LAB) has been measured with three different experimental approaches. In the first approach, α-particles were produced in the scintillator via {sup 12}C(n,α){sup 9}Be reactions. In the second approach, the scintillator was loaded with 2 % of {sup nat}Sm providing an α-emitter, {sup 147}Sm, as an internal source. In the third approach, a scintillator flask was deployed into the water-filled SNO+ detector and the radioactive contaminants {sup 222}Rn, {sup 218}Po and {sup 214}Po provided the α-particle signal. The behavior of the observed α-particle light outputs are in agreement with each case successfully described by Birks' law. The resulting Birks parameter kB ranges from (0.0066 ± 0.0016) to (0.0076 ± 0.0003) cm/MeV. In the first approach, the α-particle light response was measured simultaneously with the light response of recoil protons produced via neutron- proton elastic scattering. This enabled a first time a direct comparison of kB describing the proton and the α-particle response of LAB based scintillator. The observed kB values describing the two light response functions deviate by more than 5σ. The presented results are valuable for all current and future detectors, using LAB based scintillator as target, since they depend on an accurate knowledge of the scintillator response to different particles. (orig.)

  20. Integrating Multiple On-line Knowledge Bases for Disease-Lab Test Relation Extraction

    Science.gov (United States)

    Zhang, Yaoyun; Soysal, Ergin; Moon, Sungrim; Wang, Jingqi; Tao, Cui; Xu, Hua

    2015-01-01

    A computable knowledge base containing relations between diseases and lab tests would be a great resource for many biomedical informatics applications. This paper describes our initial step towards establishing a comprehensive knowledge base of disease and lab tests relations utilizing three public on-line resources. LabTestsOnline, MedlinePlus and Wikipedia are integrated to create a freely available, computable disease-lab test knowledgebase. Disease and lab test concepts are identified using MetaMap and relations between diseases and lab tests are determined based on source-specific rules. Experimental results demonstrate a high precision for relation extraction, with Wikipedia achieving the highest precision of 87%. Combining the three sources reached a recall of 51.40%, when compared with a subset of disease-lab test relations extracted from a reference book. Moreover, we found additional disease-lab test relations from on-line resources, indicating they are complementary to existing reference books for building a comprehensive disease and lab test relation knowledge base. PMID:26306271

  1. Laser Coal Analyzer Based on LabVIEW%基于LabVIEW的激光煤质分析仪

    Institute of Scientific and Technical Information of China (English)

    冯晓霞; 张雷; 王乐; 胡志裕; 马维光; 尹王保; 贾锁堂

    2011-01-01

    针对目前煤质分析操作程序繁琐、分析周期长的现状,基于LabVIEW编程设计了一种激光煤质分析仪.该仪器应用激光光谱技术,运用LabVIEW编程实现对激光煤质分析仪中BoxCar,DAQ、光谱仪和激光器等关键部件控制及对光谱数据进行采集与分析.通过实际测试,该仪器碳元素测量精度SD值不超过1.6%,满足了燃煤电厂对煤质的分析要求.这种方法可在地矿、环保、医药、材料、考古、食品安全、生化及冶金等领域推广应用.%A new coal laser analyzer was designed based on the LabVIEW programming to overcome the flaw in the traditional coal analysis with tedious operation sequence and long analysis cycle. The instrument was based on laser spectroscopy technique and the BoxCar, DAQ, spectrometer and other key components controlled by LabVIEW routine while data acquisition and spectral analysis were performed. The carbon element in coal was measured and the SD values of accuracy did not exceed 1. 6%. It fully meets the analysis requirements of the coal fired power plants. This method can be extended to mining, environmental protection, medicine, materials, archeology, food safety, biological, metallurgical and other application areas.

  2. Micromotor-based lab-on-chip immunoassays

    Science.gov (United States)

    García, Miguel; Orozco, Jahir; Guix, Maria; Gao, Wei; Sattayasamitsathit, Sirilak; Escarpa, Alberto; Merkoçi, Arben; Wang, Joseph

    2013-01-01

    Here we describe the first example of using self-propelled antibody-functionalized synthetic catalytic microengines for capturing and transporting target proteins between the different reservoirs of a lab-on-a-chip (LOC) device. A new catalytic polymer/Ni/Pt microtube engine, containing carboxy moieties on its mixed poly(3,4-ethylenedioxythiophene) (PEDOT)/COOH-PEDOT polymeric outermost layer, is further functionalized with the antibody receptor to selectively recognize and capture the target protein. The new motor-based microchip immunoassay operations are carried out without any bulk fluid flow, replacing the common washing steps in antibody-based protein bioassays with the active transport of the captured protein throughout the different reservoirs, where each step of the immunoassay takes place. A first microchip format involving an `on-the-fly' double-antibody sandwich assay (DASA) is used for demonstrating the selective capture of the target protein, in the presence of excess of non-target proteins. A secondary antibody tagged with a polymeric-sphere tracer allows the direct visualization of the binding events. In a second approach the immuno-nanomotor captures and transports the microsphere-tagged antigen through a microchannel network. An anti-protein-A modified microengine is finally used to demonstrate the selective capture, transport and convenient label-free optical detection of a Staphylococcus aureus target bacteria (containing proteinA in its cell wall) in the presence of a large excess of non-target (Saccharomyces cerevisiae) cells. The resulting nanomotor-based microchip immunoassay offers considerable potential for diverse applications in clinical diagnostics, environmental and security monitoring fields.Here we describe the first example of using self-propelled antibody-functionalized synthetic catalytic microengines for capturing and transporting target proteins between the different reservoirs of a lab-on-a-chip (LOC) device. A new catalytic

  3. Web-based versus lab-based studies: A response to Kendall

    NARCIS (Netherlands)

    Honing, H.; Reips, U.-D.

    2008-01-01

    While in an earlier commentary (Honing & Ladinig, 2008) we stressed the potential of Web-delivered experiments for music perception research, the ongoing discussion on Web-based versus lab-based studies seems to circle around issues of method and control (Mehler, 1999; Kendall, 2008). We agree with

  4. Magnetic particles as liquid carriers in the microfluidic lab-in-tube approach to detect phase change.

    Science.gov (United States)

    Blumenschein, Nicholas A; Han, Daewoo; Caggioni, Marco; Steckl, Andrew J

    2014-06-11

    Magnetic beads (MBs) with ∼1.9 μm average diameter were used to transport specific microliter-scale volumes of liquids between adjacent reservoirs within a closed tube under the influence of a magnetic field. The tube's inner surface is coated with a hydrophobic layer, enabling the formation of a surface tension valve by inserting an air gap between reservoirs. This transfer process was implemented by keeping the MBs stationary with a fixed external magnet while the liquid reservoirs were translated by a computer-controlled syringe pump system. The magnet induces the aggregation of MBs in a loosely packed cluster (void volume ∼90-95%) against the tube's inner wall. The liquid trapped in the MB cluster is transported across the air gap between reservoirs. Fluorescence intensity from a dye placed in one reservoir is used to measure the volume of liquid transferred between reservoirs. The carry-over liquid volume is controlled by the mass of the MBs within the device. The typical volume of liquid carried by the MB cluster is ∼2 to 3 μL/mg of beads, allowing the use of small samples. This technique can be used to study the effect of small compositional variation on the properties of fluid mixtures. The feasibility of this "lab-in-tube" approach for binary phase diagram determination in a water-surfactant (C12E5) system was demonstrated.

  5. Developing Inquiry-Based Labs Using Micro-Column Chromatography

    Science.gov (United States)

    Barden-Gabbei, Laura M.; Moffitt, Deborah L.

    2006-01-01

    Chromatography is a process by which mixtures can be separated or substances can be purified. Biological and chemical laboratories use many different types of chromatographic processes. For example, the pharmaceutical industry uses chromatographic techniques to purify drugs, medical labs use them to identify blood components such as cholesterol,…

  6. 基于LabVIEW的测试软件的研制%Test Software Design Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    李志谭; 辛彦红

    2006-01-01

    简要介绍虚拟仪器和LabVIEW开发系统的功能特点和发展情况,并开发出了在LabVIEW环境下的虚拟测试软件.实践证明,基于LabVIEW的测试软件系统更为高效、易行.

  7. The Design of DataBase Management System Base on LabVIEW%LabVIEW数据库系统

    Institute of Scientific and Technical Information of China (English)

    陈文

    2004-01-01

    文中在介绍最新技术-虚拟仪器及其开发环境LabVIEW的特点的基础上,分析并实现将LabVIEW与数据库系统的连接调用的高级技术,它是在大规模测量系统中使用的重要技术.实践证明该技术得到了广泛的应用.

  8. Liquid-infiltrated photonic crystals for lab-on-a-chip applications

    DEFF Research Database (Denmark)

    Xiao, Sanshui; Pedersen, Jesper; Mortensen, Niels Asger

    2007-01-01

    In this paper we theoretically discuss how a strongly dispersive photonic crystals environment may be used to enhance the light-matter interactions, thus potentially compensating for the reduced optical path in typical lab-on- a-chip systems. Combining electromagnetic perturbation theory with full...

  9. Liquid nitrogen tests of a Torus coil for the Jefferson Lab 12GeV accelerator upgrade

    Energy Technology Data Exchange (ETDEWEB)

    Fair, Ruben J. [JLAB; Ghoshal, Probir K. [JLAB; Bruhwel, Krister B. [JLAB; Kashy, David H. [JLAB; Machie, Danny [JLAB; Bachimanchi, Ramakrishna [JLAB; Taylor, William; Fischer, John W. [JLAB; Legg, Robert A. [JLAB; Powers, Jacob R. [JLAB

    2015-06-01

    A magnet system consisting of six superconducting trapezoidal racetrack-type coils is being built for the Jefferson Lab 12-GeV accelerator upgrade project. The magnet coils are wound with Superconducting Super Collider-36 NbTi strand Rutherford cable soldered into a copper channel. Each superconducting toroidal coil is force cooled by liquid helium, which circulates in a tube that is in good thermal contact with the inside of the coil. Thin copper sheets are soldered to the helium cooling tube and enclose the superconducting coil, providing cooling to the rest of the coil pack. As part of a rigorous risk mitigation exercise, each of the six coils is cooled with liquid nitrogen (LN2) to 80 K to validate predicted thermal stresses, verify the robustness and integrity of electrical insulation, and evaluate the efficacy of the employed conduction cooling method. This paper describes the test setup, the tests performed, and the findings.

  10. Immunoassay of paralytic shellfish toxins by moving magnetic particles in a stationary liquid-phase lab-on-a-chip.

    Science.gov (United States)

    Kim, Myoung-Ho; Choi, Suk-Jung

    2015-04-15

    In this study, we devised a stationary liquid-phase lab-on-a-chip (SLP LOC), which was operated by moving solid-phase magnetic particles in the stationary liquid phase. The SLP LOC consisted of a sample chamber to which a sample and reactants were added, a detection chamber containing enzyme substrate solution, and a narrow channel connecting the two chambers and filled with buffer. As a model system, competitive immunoassays of saxitoxin (STX), a paralytic shellfish toxin, were conducted in the SLP LOC using protein G-coupled magnetic particles (G-MPs) as the solid phase. Anti-STX antibodies, STX-horseradish peroxidase conjugate, G-MPs, and a STX sample were added to the sample chamber and reacted by shaking. While liquids were in the stationary state, G-MPs were transported from the sample chamber to the detection chamber by moving a magnet below the LOC. After incubation to allow the enzymatic reaction to occur, the absorbance of the detection chamber solution was found to be reciprocally related to the STX concentration of the sample. Thus, the SLP LOC may represent a novel, simple format for point-of-care testing applications of enzyme-linked immunosorbent assays by eliminating complicated liquid handling steps.

  11. Microfluidics-Based Lab-on-Chip Systems in DNA-Based Biosensing: An Overview

    OpenAIRE

    Sabo Wada Dutse; Nor Azah Yusof

    2011-01-01

    Microfluidics-based lab-on-chip (LOC) systems are an active research area that is revolutionising high-throughput sequencing for the fast, sensitive and accurate detection of a variety of pathogens. LOCs also serve as portable diagnostic tools. The devices provide optimum control of nanolitre volumes of fluids and integrate various bioassay operations that allow the devices to rapidly sense pathogenic threat agents for environmental monitoring. LOC systems, such as microfluidic biochips, offe...

  12. Microfluidic interface technology based on stereolithography for glass-based lab-on-a-chips.

    Science.gov (United States)

    Han, Song-I; Han, Ki-Ho

    2013-01-01

    As lab-on-a-chips are developed for on-chip integrated microfluidic systems with multiple functions, the development of microfluidic interface (MFI) technology to enable integration of complex microfluidic systems becomes increasingly important and faces many technical difficulties. Such difficulties include the need for more complex structures, the possibility of biological or chemical cross-contamination between functional compartments, and the possible need for individual compartments fabricated from different substrate materials. This chapter introduces MFI technology, based on rapid stereolithography, for a glass-based miniaturized genetic sample preparation system, as an example of a complex lab-on-a-chip that could include functional elements such as; solid-phase DNA extraction, polymerase chain reaction, and capillary electrophoresis. To enable the integration of a complex lab-on-a-chip system in a single chip, MFI technology based on stereolithography provides a simple method for realizing complex arrangements of one-step plug-in microfluidic interconnects, integrated microvalves for microfluidic control, and optical windows for on-chip optical processes.

  13. Emulation Based on LabVIEW And Multisim%基于LabVIEW结合Multisim的仿真

    Institute of Scientific and Technical Information of China (English)

    刘俊

    2008-01-01

    介绍了LabVIEW与Multisim的基本功能和进行交互仿真的方法.运用LabVIEW和Muhisim测试了三极管输出特性曲线,仿真结果验证了外围测试电路和软件编程的正确性.

  14. A user friendly Lidar system based on LabVIEW

    Energy Technology Data Exchange (ETDEWEB)

    Andersson, Mats; Weibring, P.

    1996-09-01

    Mobile differential absorption lidar (DIAL) systems have been used for the last two decades. The lidar group in Lund has performed many DIAL measurements with a mobile lidar system which was first described in 1987. This report describes how that system was updated with the graphical programming language LabVIEW in order to get a user friendly system. The software controls the lidar system and analyses measurement data. The measurement results are shown as maps of species concentration. New electronics to support the new lidar program have also been installed. The report describes how all supporting electronics and the program work. A user manual for the new program is also given. 19 refs, 79 figs, 23 charts

  15. LabVIEW based Condition Monitoring of Induction Machines

    Directory of Open Access Journals (Sweden)

    K.Vinoth Kumar

    2012-04-01

    Full Text Available This paper focuses on experimental results to prove that motor current signature analysis (MCSA can diagnose shorted turns in low voltage stator windings of 3-phase induction motors using LabVIEW. The diagnostic strategy is presented and variables that influence the diagnosis are discussed. Current spectra from motors with short-circuited turns (with and without short circuit current limiting resistors are presented and fully analyzed. Results from motors tested to failure are reported. The results in this paper were from industrial motors of different pole numbers with concentric and lap wound winding designs. Since stator failures account for a high percentage of failures the results are particularly relevant to industry.

  16. An Algebra-Based Introductory Computational Neuroscience Course with Lab.

    Science.gov (United States)

    Fink, Christian G

    2017-01-01

    A course in computational neuroscience has been developed at Ohio Wesleyan University which requires no previous experience with calculus or computer programming, and which exposes students to theoretical models of neural information processing and techniques for analyzing neural data. The exploration of theoretical models of neural processes is conducted in the classroom portion of the course, while data analysis techniques are covered in lab. Students learn to program in MATLAB and are offered the opportunity to conclude the course with a final project in which they explore a topic of their choice within computational neuroscience. Results from a questionnaire administered at the beginning and end of the course indicate significant gains in student facility with core concepts in computational neuroscience, as well as with analysis techniques applied to neural data.

  17. The experiment editor: supporting inquiry-based learning with virtual labs

    Science.gov (United States)

    Galan, D.; Heradio, R.; de la Torre, L.; Dormido, S.; Esquembre, F.

    2017-05-01

    Inquiry-based learning is a pedagogical approach where students are motivated to pose their own questions when facing problems or scenarios. In physics learning, students are turned into scientists who carry out experiments, collect and analyze data, formulate and evaluate hypotheses, and so on. Lab experimentation is essential for inquiry-based learning, yet there is a drawback with traditional hands-on labs in the high costs associated with equipment, space, and maintenance staff. Virtual laboratories are helpful to reduce these costs. This paper enriches the virtual lab ecosystem by providing an integrated environment to automate experimentation tasks. In particular, our environment supports: (i) scripting and running experiments on virtual labs, and (ii) collecting and analyzing data from the experiments. The current implementation of our environment supports virtual labs created with the authoring tool Easy Java/Javascript Simulations. Since there are public repositories with hundreds of freely available labs created with this tool, the potential applicability to our environment is considerable.

  18. Measurement of $\\alpha$-particle quenching in LAB based scintillator in independent small-scale experiments

    CERN Document Server

    von Krosigk, B; Hans, S; Junghans, A R; Kögler, T; Kraus, C; Kuckert, L; Liu, X; Nolte, R; O'Keeffe, H M; Tseung, H S Wan Chan; Wilson, J R; Wright, A; Yeh, M; Zuber, K

    2015-01-01

    The $\\alpha$-particle light response of liquid scintillators based on linear alkylbenzene (LAB) has been measured with three different experimental approaches. In the first approach, $\\alpha$-particles were produced in the scintillator via $^{12}$C($n$,$\\alpha$)$^9$Be reactions. In the second approach, the scintillator was loaded with 2% of $^{\\mathrm{nat}}$Sm providing an $\\alpha$-emitter, $^{147}$Sm, as an internal source. In the third approach, a scintillator flask was deployed into the water-filled SNO+ detector and the radioactive contaminants $^{222}$Rn, $^{218}$Po and $^{214}$Po provided the $\\alpha$-particle signal. The behavior of the observed $\\alpha$-particle light outputs are in agreement with each case successfully described by Birks' law. The resulting Birks parameter $kB$ ranges from $(0.0071\\pm0.0003)$ cm/MeV to $(0.0076\\pm0.0003)$ cm/MeV. In the first approach, the $\\alpha$-particle light response was measured simultaneously with the light response of recoil protons produced via neutron-proto...

  19. Intercomparison of Lab-Based Soil Water Extraction Methods for Stable Water Isotope Analysis

    Science.gov (United States)

    Pratt, D.; Orlowski, N.; McDonnell, J.

    2016-12-01

    The effect of pore water extraction technique on resultant isotopic signature is poorly understood. Here we present results of an intercomparison of five common lab-based soil water extraction techniques: high pressure mechanical squeezing, centrifugation, direct vapor equilibration, microwave extraction, and cryogenic extraction. We applied five extraction methods to two physicochemically different standard soil types (silty sand and clayey loam) that were oven-dried and rewetted with water of known isotopic composition at three different gravimetric water contents (8, 20, and 30%). We tested the null hypothisis that all extraction techniques would provide the same isotopic result independent from soil type and water content. Our results showed that the extraction technique had a significant effect on the soil water isotopic composition. Each method exhibited deviations from spiked reference water, with soil type and water content showing a secondary effect. Cryogenic extraction showed the largest deviations from the reference water, whereas mechanical squeezing and centrifugation provided the closest match to the reference water for both soil types. We also compared results for each extraction technique that produced liquid water on both an OA-ICOS and IRMS; differences between them were negligible.

  20. A LabVIEW based Remote DSP Laboratory

    Directory of Open Access Journals (Sweden)

    Athanasios Kalantzopoulos

    2008-07-01

    Full Text Available Remote laboratories provide the students with the capability to perform laboratory exercises exploiting the relevant equipment any time of the day without their physical presence. Furthermore, providing the ability to use a single workstation by more than one student, they contribute to the reduction of the laboratory cost. Turning to advantage the above and according to the needs of post graduate modules in the fields of DSP Systems Design and Signal Processing Systems with DSPs, we designed and developed a Remote DSP Laboratory. A student using a Web Browser has the ability via internet to turn to account the R-DSP Lab and perform experiments using DSPs (Digital Signal Processors. For now, there is the opportunity to carry out laboratory exercises such as FIR, IIR digital filters and FFT as well as run any executable file developed by the user. In any case the observation of the results is carried out through the use of specially designed Graphical User Interfaces (GUIs.

  1. Design of Keyboard Based on LabVIEW%基于LabVIEW可弹奏电子琴的设计

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

      本文主要阐述利用LabVIEW软件实现可弹奏电子琴的设计,通过对声音的频率设置,以及LabVIEW中的常用编程控件,来实现电子琴发声,本设计能实现电子琴基本演奏功能,调试效果较好。%This paper describes the realization of keyboard design by using LabVIEW software. Through the sound frequency settings,and programming controls commonly used in LabVIEW to achieve the keyboard.This design can realize the basic functions of keyboard playing.Debugging result is good.

  2. Project-based physics labs using low-cost open-source hardware

    CERN Document Server

    Bouquet, F; Fuchs-Gallezot, M; Maurines, L

    2016-01-01

    We describe a project-based physics lab, which we proposed to third-year university students. Theses labs are based on new open-source low-cost equipment (Arduino microcontrollers and compatible sensors) which allows a complete autonomy for the students. The students develop their own experimental setup and study the physics topic of their choice. Based on the results obtained by the students and on various surveys, we discuss how these projects let the students discover the reality of experimental physics and how engaging these new tools are. Technical specifications of the acquisition material and case studies are also presented for practical implementation in other universities.

  3. Feasibility of Storing Latent Heat with Liquid Crystals. Proof of Concept at Lab Scale

    Directory of Open Access Journals (Sweden)

    Rocío Bayón

    2016-04-01

    Full Text Available In this work, the first experimental results of thermotropic liquid crystals used as phase change materials for thermal storage are presented. For that purpose, the n = 10 derivative from the family of 4′-n-alkoxybiphenyl-4-carboxylic acids has been prepared. Different techniques like polarized-light microscopy, differential scanning calorimetry, thermogravimetric analysis and rheological measurements have been applied for its characterization. Having a mesophase/isotropic transition temperature around 251 °C, a clearing enthalpy of 55 kJ/kg, a thermal heat capacity of around 2.4 kJ/kg and a dynamic viscosity lower than 0.6 Pas, this compound fulfills the main requirements for being considered as latent heat storage material. Although further studies on thermal stability are necessary, the results already obtained are both promising and encouraging since they demonstrate de viability of this new application of liquid crystals as thermal storage media.

  4. A New Project-Based Lab for Undergraduate Environmental and Analytical Chemistry

    Science.gov (United States)

    Adami, Gianpiero

    2006-01-01

    A new project-based lab was developed for third year undergraduate chemistry students based on real world applications. The experience suggests that the total analytical procedure (TAP) project offers a stimulating alternative for delivering science skills and developing a greater interest for analytical chemistry and environmental sciences and…

  5. A New Project-Based Lab for Undergraduate Environmental and Analytical Chemistry

    Science.gov (United States)

    Adami, Gianpiero

    2006-01-01

    A new project-based lab was developed for third year undergraduate chemistry students based on real world applications. The experience suggests that the total analytical procedure (TAP) project offers a stimulating alternative for delivering science skills and developing a greater interest for analytical chemistry and environmental sciences and…

  6. Project-based physics labs using low-cost open-source hardware

    Science.gov (United States)

    Bouquet, F.; Bobroff, J.; Fuchs-Gallezot, M.; Maurines, L.

    2017-03-01

    We describe a project-based physics lab, which we proposed to third-year university students. These labs are based on new open-source low-cost equipment (Arduino microcontrollers and compatible sensors). Students are given complete autonomy: they develop their own experimental setup and study the physics topic of their choice. The goal of these projects is to let students to discover the reality of experimental physics. Technical specifications of the acquisition material and case studies are presented for practical implementation in other universities.

  7. An Update on ConSys Including a New LabVIEW FPGA Based LLRF System

    DEFF Research Database (Denmark)

    Worm, Torben; Nielsen, Jørgen S.

    ConSys, the Windows based control system for ASTRID and ASTRID2, is now a mature system, having been in operation for more than 15 years. All the standard programs (Console, plots, data logging, control setting store/restore etc.) are fully general and are configured through a database or file. Con......Sys is a standard publisher/subscriber system, where all nodes can act both as client and server. One very strong feature is the easy ability to make virtual devices (devices which do not depend on hardware directly, but combine hardware parameters.) For ASTRID2 a new LabVIEW based Low-Level RF system has been made...... live plots from the regulation loops are implemented in a host program on Windows. All three levels have been implemented with LabVIEW. The LLRF system is interfaced to ConSys through LabVIEW shared variables....

  8. ADVANTAGES OF THE PROGRAM-BASED LOGBOOK SUBMISSION GUI AT JEFFERSON LAB

    Energy Technology Data Exchange (ETDEWEB)

    T. McGuckin

    2006-10-24

    DTlite is a Tcl/Tk script that is used as the primary interface for making entries into Jefferson Lab's electronic logbooks. DTlite was originally written and implemented by a user to simplify submission of entries into Jefferson Lab?s electronic logbook, but has subsequently been maintained and developed by the controls software group. The use of a separate, script-based tool for logbook submissions (as opposed to a web-based submission tool bundled with the logbook database/interface) provides many advantages to the users, as well as creating many challenges to the programmers and maintainers of the electronic logbook system. The paper describes the advantages and challenges of this design model and how they have affected the development lifecycle of the electronic logbook system.

  9. Reaction time effects in lab- versus Web-based research: Experimental evidence.

    Science.gov (United States)

    Hilbig, Benjamin E

    2016-12-01

    Although Web-based research is now commonplace, it continues to spur skepticism from reviewers and editors, especially whenever reaction times are of primary interest. Such persistent preconceptions are based on arguments referring to increased variation, the limits of certain software and technologies, and a noteworthy lack of comparisons (between Web and lab) in fully randomized experiments. To provide a critical test, participants were randomly assigned to complete a lexical decision task either (a) in the lab using standard experimental software (E-Prime), (b) in the lab using a browser-based version (written in HTML and JavaScript), or (c) via the Web using the same browser-based version. The classical word frequency effect was typical in size and corresponded to a very large effect in all three conditions. There was no indication that the Web- or browser-based data collection was in any way inferior. In fact, if anything, a larger effect was obtained in the browser-based conditions than in the condition relying on standard experimental software. No differences between Web and lab (within the browser-based conditions) could be observed, thus disconfirming any substantial influence of increased technical or situational variation. In summary, the present experiment contradicts the still common preconception that reaction time effects of only a few hundred milliseconds cannot be detected in Web experiments.

  10. Experiment Based Teaching of Solar Cell Operation and Characterization Using the SolarLab Platform

    DEFF Research Database (Denmark)

    Spataru, Sergiu; Sera, Dezso; Kerekes, Tamas

    2014-01-01

    Experiment based teaching methods are a great way to get students involved and interested in almost any topic. This paper presents such a hands-on approach for teaching solar cell operation principles along with characterization and modelling methods. This is achieved with the SolarLab platform...... interfaces for exploring different solar cell principles and topics. The exercises presented in the current paper have been adapted from the original exercises developed for the SolarLab platform and are currently included in the Photovoltaic Power Systems courses (MSc and PhD level) taught at the Department...

  11. Competence-Based, Research-Related Lab Courses for Materials Modeling: The Case of Organic Photovoltaics

    Science.gov (United States)

    Schellhammer, Karl Sebastian; Cuniberti, Gianaurelio

    2017-01-01

    We are hereby presenting a didactic concept for an advanced lab course that focuses on the design of donor materials for organic solar cells. Its research-related and competence-based approach qualifies the students to independently and creatively apply computational methods and to profoundly and critically discuss the results obtained. The high…

  12. Island Explorations: Discovering Effects of Environmental Research-Based Lab Activities on Analytical Chemistry Students

    Science.gov (United States)

    Tomasik, Janice Hall; LeCaptain, Dale; Murphy, Sarah; Martin, Mary; Knight, Rachel M.; Harke, Maureen A.; Burke, Ryan; Beck, Kara; Acevedo-Polakovich, I. David

    2014-01-01

    Motivating students in analytical chemistry can be challenging, in part because of the complexity and breadth of topics involved. Some methods that help encourage students and convey real-world relevancy of the material include incorporating environmental issues, research-based lab experiments, and service learning projects. In this paper, we…

  13. The Robotic Decathlon: Project-Based Learning Labs and Curriculum Design for an Introductory Robotics Course

    Science.gov (United States)

    Cappelleri, D. J.; Vitoroulis, N.

    2013-01-01

    This paper presents a series of novel project-based learning labs for an introductory robotics course that are developed into a semester-long Robotic Decathlon. The last three events of the Robotic Decathlon are used as three final one-week-long project tasks; these replace a previous course project that was a semester-long robotics competition.…

  14. A Study of the Literature on Lab-Based Instruction in Biology

    Science.gov (United States)

    Puttick, Gillian; Drayton, Brian; Cohen, Eliza

    2015-01-01

    We analyzed the practitioner literature on lab-based instruction in biology in "The American Biology Teacher" between 2007 and 2012. We investigated what laboratory learning looks like in biology classrooms, what topics are addressed, what instructional methods and activities are described, and what is being learned about student…

  15. Students Dig Deep in the Mystery Soil Lab: A Playful, Inquiry-Based Soil Laboratory Project

    Science.gov (United States)

    Thiet, Rachel K.

    2014-01-01

    The Mystery Soil Lab, a playful, inquiry-based laboratory project, is designed to develop students' skills of inquiry, soil analysis, and synthesis of foundational concepts in soil science and soil ecology. Student groups are given the charge to explore and identify a "Mystery Soil" collected from a unique landscape within a 10-mile…

  16. A Study of the Literature on Lab-Based Instruction in Biology

    Science.gov (United States)

    Puttick, Gillian; Drayton, Brian; Cohen, Eliza

    2015-01-01

    We analyzed the practitioner literature on lab-based instruction in biology in "The American Biology Teacher" between 2007 and 2012. We investigated what laboratory learning looks like in biology classrooms, what topics are addressed, what instructional methods and activities are described, and what is being learned about student…

  17. Students Dig Deep in the Mystery Soil Lab: A Playful, Inquiry-Based Soil Laboratory Project

    Science.gov (United States)

    Thiet, Rachel K.

    2014-01-01

    The Mystery Soil Lab, a playful, inquiry-based laboratory project, is designed to develop students' skills of inquiry, soil analysis, and synthesis of foundational concepts in soil science and soil ecology. Student groups are given the charge to explore and identify a "Mystery Soil" collected from a unique landscape within a 10-mile…

  18. The TriLab, a Novel ICT Based Triple Access Mode Laboratory Education Model

    Science.gov (United States)

    Abdulwahed, Mahmoud; Nagy, Zoltan K.

    2011-01-01

    This paper introduces a novel model of laboratory education, namely the TriLab. The model is based on recent advances in ICT and implements a three access modes to the laboratory experience (virtual, hands-on and remote) in one software package. A review of the three modes is provided with highlights of advantages and disadvantages of each mode.…

  19. The Robotic Decathlon: Project-Based Learning Labs and Curriculum Design for an Introductory Robotics Course

    Science.gov (United States)

    Cappelleri, D. J.; Vitoroulis, N.

    2013-01-01

    This paper presents a series of novel project-based learning labs for an introductory robotics course that are developed into a semester-long Robotic Decathlon. The last three events of the Robotic Decathlon are used as three final one-week-long project tasks; these replace a previous course project that was a semester-long robotics competition.…

  20. Island Explorations: Discovering Effects of Environmental Research-Based Lab Activities on Analytical Chemistry Students

    Science.gov (United States)

    Tomasik, Janice Hall; LeCaptain, Dale; Murphy, Sarah; Martin, Mary; Knight, Rachel M.; Harke, Maureen A.; Burke, Ryan; Beck, Kara; Acevedo-Polakovich, I. David

    2014-01-01

    Motivating students in analytical chemistry can be challenging, in part because of the complexity and breadth of topics involved. Some methods that help encourage students and convey real-world relevancy of the material include incorporating environmental issues, research-based lab experiments, and service learning projects. In this paper, we…

  1. Design of an Incubator for Premature Infant Based on LabVIEW.

    Science.gov (United States)

    Zhang, Lina; Zhou, Runjing

    2005-01-01

    This paper introduces the system structure, hardware circuits, control algorithms, and software program of the incubator for premature infant based on LabVIEW. The main advantages of this device are that preheating is less time than others, the capability of meeting of emergency is provided, control track of temperature and humidity are visible, operation is easy to clinical practice, and maintainability is possessed.

  2. ASK4Labs: A Web-Based Repository for Supporting Learning Design Driven Remote and Virtual Labs Recommendations

    Science.gov (United States)

    Zervas, Panagiotis; Fiskilis, Stefanos; Sampson, Demetrios G.

    2014-01-01

    Over the past years, Remote and Virtual Labs (RVLs) have gained increased attention for their potential to support technology-enhanced science education by enabling science teachers to improve their day-to-day science teaching. Therefore, many educational institutions and scientific organizations have invested efforts for providing online access…

  3. Design of experiment system based on LabVIEW%基于LabVIEW的实验系统设计

    Institute of Scientific and Technical Information of China (English)

    仲志燕

    2015-01-01

    提出构建远程实验室的概念,采用B/S结构设计,利用LabVIEW 8.6和Microsoft Office Access 2007开发该实验系统。运用LabVIEW编程语言,建立友好的人机界面,实现注册、登录,虚拟实验,资源链接等功能,实现在局域网内信息的动态、交互的管理,并为培养学生自主性学习提供一种有效的实现方案。%This thesis puts forward the concept of remote laboratory construction,using B/S structure design to devel-op the experimental system with Lab VIEW 8.6 and Microsoft Office Access 2007.A friendly man-machine interface is established by LabVIEW programming language to implement the registration login management,conduct experi-ments,resource links and other functions and achieve a dynamic,interactive information management within the LAN.This thesis provides an effective implementation scheme for the cultivation of students'autonomous learning.

  4. CANape and LabVIEW-based data acquisition system built DCT%基于CANape与LabVIEW搭建DCT数据采集系统

    Institute of Scientific and Technical Information of China (English)

    李向兵

    2015-01-01

    本文以某国产自主湿式双离合自动变速箱(Wet Dual Cluth Transmission,WDCT)为研究对象,结合LabVIEW与CANape搭建DCT数据采集系统,为DCT产品开发和性能测试提供数据参考。%The paper took a domestic Wet Dual Cluth Transmission as research object and aimed to build a DCT data acquisition system based on CANape and LabVIEW to provide data reference for DCT product development and performance test.

  5. Utilizing Problem-Based Learning in Qualitative Analysis Lab Experiments

    Science.gov (United States)

    Hicks, Randall W.; Bevsek, Holly M.

    2012-01-01

    A series of qualitative analysis (QA) laboratory experiments utilizing a problem-based learning (PBL) module has been designed and implemented. The module guided students through the experiments under the guise of cleaning up a potentially contaminated water site as employees of an environmental chemistry laboratory. The main goal was the…

  6. Building lab-scale x-ray tube based irradiators

    Science.gov (United States)

    The construction of economical x-ray tube based irradiators in a variety of configurations is described using 1000 Watt x-ray tubes. Single tube, double tube, and four tube designs are described, as well as various cabinet construction techniques. Relatively high dose rates were achieved for small s...

  7. Remote Labs and Game-Based Learning for Process Control

    Science.gov (United States)

    Zualkernan, Imran A.; Husseini, Ghaleb A.; Loughlin, Kevin F.; Mohebzada, Jamshaid G.; El Gaml, Moataz

    2013-01-01

    Social networking platforms and computer games represent a natural informal learning environment for the current generation of learners in higher education. This paper explores the use of game-based learning in the context of an undergraduate chemical engineering remote laboratory. Specifically, students are allowed to manipulate chemical…

  8. Remote Labs and Game-Based Learning for Process Control

    Science.gov (United States)

    Zualkernan, Imran A.; Husseini, Ghaleb A.; Loughlin, Kevin F.; Mohebzada, Jamshaid G.; El Gaml, Moataz

    2013-01-01

    Social networking platforms and computer games represent a natural informal learning environment for the current generation of learners in higher education. This paper explores the use of game-based learning in the context of an undergraduate chemical engineering remote laboratory. Specifically, students are allowed to manipulate chemical…

  9. Droplet-based Biosensing for Lab-on-a-Chip, Open Microfluidics Platforms

    Directory of Open Access Journals (Sweden)

    Piyush Dak

    2016-04-01

    Full Text Available Low cost, portable sensors can transform health care by bringing easily available diagnostic devices to low and middle income population, particularly in developing countries. Sample preparation, analyte handling and labeling are primary cost concerns for traditional lab-based diagnostic systems. Lab-on-a-chip (LoC platforms based on droplet-based microfluidics promise to integrate and automate these complex and expensive laboratory procedures onto a single chip; the cost will be further reduced if label-free biosensors could be integrated onto the LoC platforms. Here, we review some recent developments of label-free, droplet-based biosensors, compatible with “open” digital microfluidic systems. These low-cost droplet-based biosensors overcome some of the fundamental limitations of the classical sensors, enabling timely diagnosis. We identify the key challenges that must be addressed to make these sensors commercially viable and summarize a number of promising research directions.

  10. Droplet-based Biosensing for Lab-on-a-Chip, Open Microfluidics Platforms.

    Science.gov (United States)

    Dak, Piyush; Ebrahimi, Aida; Swaminathan, Vikhram; Duarte-Guevara, Carlos; Bashir, Rashid; Alam, Muhammad A

    2016-04-14

    Low cost, portable sensors can transform health care by bringing easily available diagnostic devices to low and middle income population, particularly in developing countries. Sample preparation, analyte handling and labeling are primary cost concerns for traditional lab-based diagnostic systems. Lab-on-a-chip (LoC) platforms based on droplet-based microfluidics promise to integrate and automate these complex and expensive laboratory procedures onto a single chip; the cost will be further reduced if label-free biosensors could be integrated onto the LoC platforms. Here, we review some recent developments of label-free, droplet-based biosensors, compatible with "open" digital microfluidic systems. These low-cost droplet-based biosensors overcome some of the fundamental limitations of the classical sensors, enabling timely diagnosis. We identify the key challenges that must be addressed to make these sensors commercially viable and summarize a number of promising research directions.

  11. Web-Based Learning and Training for Virtual Metrology Lab

    CERN Document Server

    Al-Zahrani, Fahad

    2010-01-01

    The use of World Web Wide for distance education has received increasing attention over the past decades. The real challenge of adapting this technology for engineering education and training is to facilitate the laboratory experiments via Internet. In the sciences, measurement plays an important role. The accuracy of the measurement, as well as the units, help scientists to better understand phenomena occurring in nature. This paper introduces Metrology educators to the use and adoption of Java-applets in order to create virtual, online Metrology laboratories for students. These techniques have been used to successfully form a laboratory course which augments the more conventional lectures in concepts of Metrology course at Faculty of Engineering, Albaha University, KSA. Improvements of the package are still undergoing to incorporate Web-based technologies (Internet home page, HTML, Java programming etc...). This Web-based education and training has been successfully class-tested within an undergraduate prel...

  12. Brewing for Students: An Inquiry-Based Microbiology Lab

    OpenAIRE

    Sato, Brian K.; Usman Alam; Samantha J Dacanay; Amanda K. Lee; Shaffer, Justin F.

    2015-01-01

    In an effort to improve and assess student learning, there has been a push to increase the incorporation of discovery-driven modules and those that contain real-world relevance into laboratory curricula. To further this effort, we have developed, implemented, and assessed an undergraduate microbiology laboratory experiment that requires students to use the scientific method while brewing beer. The experiment allows students to brew their own beer and characterize it based on taste, alcohol co...

  13. Frequency spectrum analysis of 252Cf neutron source based on LabVIEW%基于LabVIEW的252Cf中子源频谱分析

    Institute of Scientific and Technical Information of China (English)

    米德伶; 李鹏程

    2011-01-01

    The frequency spectrum analysis of 252Cf Neutron source is an extremely important method in nuclear stochastic signal processing.Focused on the special “0” and “1” structure of neutron pulse series, this paper proposes a fast-correlation algorithm to improve the computational rate of the spectrum analysis system.And the multi-core processor technology is employed as well as multi-threaded programming techniques of LabVIEW to construct frequency spectrum analysis system of 252 Cf neutron source based on LabVIEW.It not only obtains the auto-correlation and cross correlation results, but also auto-power spectrum,cross-power spectrum and ratio of spectral density.The results show that:analysis tools based on LabVIEW improve the fast auto-correlation and cross correlation code operating efficiency about by 25% to 35%, also verify the feasibility of using LabVIEW for spectrum analysis.%从252 Cf中子源频谱测量系统的基本原理出发,针对中子脉冲序列本身"0,1"数据结构的特点,设计了自、互相关快速算法.采用LabVIEW多核处理器、多线程编程技术构建了基于LabVIEW的"52 Cf中子源频谱分析系统,不仅获得了自、互相关的快速计算结果,而且获得了自、互功率谱及谱密度比.研究结果表明:基于LabVIEW分析工具,既提升了自、互相关算法代码25%-35%的执行效率,又验证了LabVIEW用于进行频谱系统分析的可行性.

  14. Fermentation Characteristics of Rice Crop Residue-Based Silage Treated by Epiphytic and Commercial LAB

    Directory of Open Access Journals (Sweden)

    B. Santoso

    2012-04-01

    Full Text Available Two experiments were conducted to investigate the effects of addition of lactic acid bacteria (LAB inoculant from king grass and a commercial inoculant of L. plantarum on fermentation characteristics and nutrient digestibility of rice crop residue-based silage. In experiment 1, mixture of rice crop residue (RC, soybean curd residue (SC and cassava waste (CW in a 80 : 10 : 10 (on dry matter basis ratio was used as silage material. Four treatments silage were (A RC + SC + CW as a control; (B RC + SC + CW + LAB inoculant from king grass (2%, v/w ; (C RC + SC + CW + LAB inoculant from king grass (3%, v/w; (D RC + SC + CW + L. plantarum inoculant (2%, v/w. In experiment 2, six Kacang goats were used in a 6 × 3 Youden square experiment and fed elephant grass, rice straw, and rice crop residue-based silage. The results showed that crude protein (CP content in silages B, C, and D was slightly higher than silage A. Lactic acid concentration was significantly higher (P<0.01 in silages B and C compared to silage D. The pH value of control silage (A was higher (P<0.05 than silage treated with LAB inoculant. Rice crop residue-based silage had higher (P<0.01 digestibility of dry matter (DM, organic matter (OM, and CP than rice straw. It was concluded that addition of epiphytic LAB inoculant from king grass to rice crop residue resulting in a good fermentation quality of silage compared to addition of L. plantarum inoculant.

  15. Office-based vascular lab: is it worth the effort?

    Science.gov (United States)

    Mansour, M Ashraf; Zwolak, Robert M

    2009-03-01

    The vascular laboratory is an essential part of any contemporary clinical vascular practice. The prototype of the vascular laboratory consisted mainly of instruments designed to understand the hemodynamics of the vascular tree. Earlier versions also played important roles in clinical research. Currently, sophisticated imaging equipments enable clinicians to evaluate the whole range of arterial and venous diseases in the outpatient setting. Both patients and physicians have found this to be very practical and convenient. Furthermore, income generated from performing diagnostic tests in the vascular laboratory helps support a variety of clinical activities and research. However, recent cost-cutting measures by medical insurance carriers are threatening the viability of office-based vascular laboratories

  16. Connecting Lab-Based Attosecond Science with FEL research

    CERN Document Server

    CERN. Geneva

    2011-01-01

    In the last few years laboratory-scale femtosecond laser-based research using XUV light has developed dramatically following the successful development of attosecond laser pulses by means of high-harmonic generation. Using attosecond laser pulses, studies of electron dynamics on the natural timescale that electronic processes occur in atoms, molecules and solids can be contemplated, providing unprecedented insight into the fundamental role that electrons play in photo-induced processes. In my talk I will briefly review the present status of the attosecond science research field in terms of present and foreseen capabilities, and discuss a few recent applications, including a first example of the use of attosecond laser pulses in molecular science. In addition, I will discuss very recent results of experiments where photoionization of dynamically aligned molecules is investigated using a high-harmonics XUV source. Photoionization of aligned molecules becomes all the more interesting if the experiment is perfo...

  17. PDMS based micro-optics and microchannels for lab-on-a-chip application

    Science.gov (United States)

    Pardelova, M.; Pudiš, D.; Jandura, D.; Gaso, P.

    2015-05-01

    We describe new technologies for a fabrication of microfluidics and micro-optics components for lab-on-a-chip applications based on polydimethylsiloxane. We use combination of direct laser writing (DLW) lithography for channel patterning in photoresist layer with PDMS imprinting process. Unique imprinting and optical properties favors PDMS for fabrication of different microchannels and microlens arrays. This technology allows the fabrication of different PDMS channel structures. Also PDMS based microlens arrays were patterned in photoresist layer by DLW process and also by interference lithography and imprinted in PDMS layer. Spontaneous microlens array based on polystyrene microspheres was also prepared by spin-coating of dispersed microspheres in photoresist and for organized microlens array we used predefined two-dimensional grid prepared by interference lithography. Final structures were investigated by confocal and optical microscope. The prepared PDMS and polystyrene based microdevices can be used in lab-on-a-chip applications in sensing and biological measurements.

  18. Microfluidics-Based Lab-on-Chip Systems in DNA-Based Biosensing: An Overview

    Directory of Open Access Journals (Sweden)

    Sabo Wada Dutse

    2011-05-01

    Full Text Available Microfluidics-based lab-on-chip (LOC systems are an active research area that is revolutionising high-throughput sequencing for the fast, sensitive and accurate detection of a variety of pathogens. LOCs also serve as portable diagnostic tools. The devices provide optimum control of nanolitre volumes of fluids and integrate various bioassay operations that allow the devices to rapidly sense pathogenic threat agents for environmental monitoring. LOC systems, such as microfluidic biochips, offer advantages compared to conventional identification procedures that are tedious, expensive and time consuming. This paper aims to provide a broad overview of the need for devices that are easy to operate, sensitive, fast, portable and sufficiently reliable to be used as complementary tools for the control of pathogenic agents that damage the environment.

  19. Microfluidics-based lab-on-chip systems in DNA-based biosensing: an overview.

    Science.gov (United States)

    Dutse, Sabo Wada; Yusof, Nor Azah

    2011-01-01

    Microfluidics-based lab-on-chip (LOC) systems are an active research area that is revolutionising high-throughput sequencing for the fast, sensitive and accurate detection of a variety of pathogens. LOCs also serve as portable diagnostic tools. The devices provide optimum control of nanolitre volumes of fluids and integrate various bioassay operations that allow the devices to rapidly sense pathogenic threat agents for environmental monitoring. LOC systems, such as microfluidic biochips, offer advantages compared to conventional identification procedures that are tedious, expensive and time consuming. This paper aims to provide a broad overview of the need for devices that are easy to operate, sensitive, fast, portable and sufficiently reliable to be used as complementary tools for the control of pathogenic agents that damage the environment.

  20. 基于LabVIEW的汽车AMT数据采集仪%Design of Data Acquisition Instrument for Vehicle AMT Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    薛大为; 杨春兰; 程荣龙

    2012-01-01

    In order to solve the design problem of data acquisition for vehicle AMT,designed the data acquisition instrument for vehicle AMT based on LabVIEW. Introduced the makeup module and the design process of data acquisition instrument for vehicle AMT based on LabVIEW in detail. By practice, the strong graphical interfaces function makes the developed system franker and friendlier,the operation easier and the graphical program language greatly promotes the efficiency of the making program.%为了解决汽车AMT系统设计过程中的数据采集问题,设计了基于LabVIEW的汽车AMT数据采集仪.详细介绍了数据采集仪组成模块和设计过程,并给出了每个功能模块的程序流程和程序代码.实践证明,LabVIEW强大的图形界面交互功能使得开发的系统更加直观、友好、易于操作,而图形化的编程语言也大大提升了编程效率.

  1. 基于LabVIEW与Access的虚拟实验教学系统%A virtual experiment teaching system based on LabVIEW and Access

    Institute of Scientific and Technical Information of China (English)

    宁芬; 周庆华; 唐立军; 邓敏; 罗雪伦; 王广鹏

    2016-01-01

    基于LabVIEW开发环境与Access数据库构建了一个虚拟实验教学系统。该系统应用教育电子身份号( e2 ID)实现系统用户的实名制,基于LabSQL访问Access数据库的方法实现了用户登录与管理功能,并采用可扩展的实验模块设计。以信号调制解调实验为例介绍了实验模块的设计与实现。%The paper builds a virtual experiment teaching system based on the LabVIEW development environment and Access database. The system applied educational electronic identity( e2 ID) to realize system users’ real⁃name system. The paper realizes the function of the user login and management based on the method of LabSQL accessing Access database. Meanwhile, taking signal demodulation experiment as an example, this paper also presents the design and implementation of experiment module.

  2. Brewing for Students: An Inquiry-Based Microbiology Lab

    Directory of Open Access Journals (Sweden)

    Brian K. Sato

    2015-08-01

    Full Text Available In an effort to improve and assess student learning, there has been a push to increase the incorporation of discovery-driven modules and those that contain real-world relevance into laboratory curricula. To further this effort, we have developed, implemented, and assessed an undergraduate microbiology laboratory experiment that requires students to use the scientific method while brewing beer. The experiment allows students to brew their own beer and characterize it based on taste, alcohol content, calorie content, pH, and standard reference method. In addition, we assessed whether students were capable of achieving the module learning objectives through a pre-/posttest, student self-evaluation, exam-embedded questions, and an associated worksheet. These objectives included describing the role of the brewing ingredients and predicting how altering the ingredients would affect the characteristics of the beer, amongst others. By completing this experimental module, students accomplished the module objectives, had greater interest in brewing, and were more likely to view beer in scientific terms. Editor's Note:The ASM advocates that students must successfully demonstrate the ability to explain and practice safe laboratory techniques. For more information, read the laboratory safety section of the ASM Curriculum Recommendations: Introductory Course in Microbiology and the Guidelines for Biosafety in Teaching Laboratories, available at www.asm.org. The Editors of JMBE recommend that adopters of the protocols included in this article follow a minimum of Biosafety Level 1 practices.

  3. Brewing for Students: An Inquiry-Based Microbiology Lab

    Science.gov (United States)

    Sato, Brian K.; Alam, Usman; Dacanay, Samantha J.; Lee, Amanda K.; Shaffer, Justin F.

    2015-01-01

    In an effort to improve and assess student learning, there has been a push to increase the incorporation of discovery-driven modules and those that contain real-world relevance into laboratory curricula. To further this effort, we have developed, implemented, and assessed an undergraduate microbiology laboratory experiment that requires students to use the scientific method while brewing beer. The experiment allows students to brew their own beer and characterize it based on taste, alcohol content, calorie content, pH, and standard reference method. In addition, we assessed whether students were capable of achieving the module learning objectives through a pre-/posttest, student self-evaluation, exam-embedded questions, and an associated worksheet. These objectives included describing the role of the brewing ingredients and predicting how altering the ingredients would affect the characteristics of the beer, amongst others. By completing this experimental module, students accomplished the module objectives, had greater interest in brewing, and were more likely to view beer in scientific terms. Journal of Microbiology & Biology Education PMID:26753030

  4. Brewing for Students: An Inquiry-Based Microbiology Lab.

    Science.gov (United States)

    Sato, Brian K; Alam, Usman; Dacanay, Samantha J; Lee, Amanda K; Shaffer, Justin F

    2015-12-01

    In an effort to improve and assess student learning, there has been a push to increase the incorporation of discovery-driven modules and those that contain real-world relevance into laboratory curricula. To further this effort, we have developed, implemented, and assessed an undergraduate microbiology laboratory experiment that requires students to use the scientific method while brewing beer. The experiment allows students to brew their own beer and characterize it based on taste, alcohol content, calorie content, pH, and standard reference method. In addition, we assessed whether students were capable of achieving the module learning objectives through a pre-/posttest, student self-evaluation, exam-embedded questions, and an associated worksheet. These objectives included describing the role of the brewing ingredients and predicting how altering the ingredients would affect the characteristics of the beer, amongst others. By completing this experimental module, students accomplished the module objectives, had greater interest in brewing, and were more likely to view beer in scientific terms. Journal of Microbiology & Biology Education.

  5. Optical Character Recognition Based Speech Synthesis System Using LabVIEW

    Directory of Open Access Journals (Sweden)

    S.K. Singla

    2014-10-01

    Full Text Available Knowledge extraction by just listening to sounds is a distinctive property. Speech signal is more effective means of communication than text because blind and visually impaired persons can also respond to sounds. This paper aims to develop a cost effective, and user friendly optical character recognition (OCR based speech synthesis system. The OCR based speech synthesis system has been developed using Laboratory virtual instruments engineering workbench (LabVIEW 7.1.

  6. Air-condition Control System of Weaving Workshop Based on LabVIEW

    Science.gov (United States)

    Song, Jian

    The project of air-condition measurement and control system based on LabVIEW is put forward for the sake of controlling effectively the environmental targets in the weaving workshop. In this project, which is based on the virtual instrument technology and in which LabVIEW development platform by NI is adopted, the system is constructed on the basis of the virtual instrument technology. It is composed of the upper PC, central control nodes based on CC2530, sensor nodes, sensor modules and executive device. Fuzzy control algorithm is employed to achieve the accuracy control of the temperature and humidity. A user-friendly man-machine interaction interface is designed with virtual instrument technology at the core of the software. It is shown by experiments that the measurement and control system can run stably and reliably and meet the functional requirements for controlling the weaving workshop.

  7. Motor Type Test Data Acquisition System Based on LabVIEW%基于LabVIEW的电机型式试验数据采集系统

    Institute of Scientific and Technical Information of China (English)

    孟超群

    2013-01-01

    设计了一种以LabVIEW作为开发工具的电机型式试验的数据采集系统.应用智能仪器对试验过程中的电参量和非电参量数据进行采集,通过相应的通信接口标准实现LabVIEW环境下上位机数据的传输与控制.实践表明该系统自动化程度高、操作简单、测试精度高、投入使用后效果良好.%The motor type test data acquisition system based on LabVIEW was designed.The Intelligent instruments were used to acquire the electrical parametric and non-electrical parameters during the test and the corresponding communication interface standard were adapted to fulfill the data transfer and instrument control in the LabVIEW environment.It was proved that this system had the advantages of high automation,simple operation and high accuracy and efficiency.Good effects were proved during the test.

  8. Optofluidic elements in liquid-based sensor systems; Optofluidische Komponenten in der Fluessigkeitssensorik

    Energy Technology Data Exchange (ETDEWEB)

    Rosenauer, Michael; Weber, Emanuel; Vellekoop, Michael J. [Technische Univ. Wien (Austria). Inst. fuer Sensor- und Aktuatorsysteme; Stampfl, Juergen [Technische Univ. Wien (Austria). Inst. fuer Werkstoffwissenschaft und Werkstofftechnologie

    2010-07-01

    Adaptive optical components in integrated sensor systems are critical for the excitation and detection of luminescence signals in bioassay applications. In this work two types of optofluidic elements with the ability to increase the sensitivity and applicability of these lab-on-a-chips are discussed. First a hydrodynamic shapeable liquid microlens based on a microfluidic channel structure is presented. It allows a three-dimensional alteration of the focal length in-plane to the substrate. The second sensor system comprises an adaptive liquid-core/liquid-cladding waveguide. The prototypes are fabricated by micro-stereolithography in a transparent photopolymer. (orig.)

  9. Web-based e-learning and virtual lab of human-artificial immune system.

    Science.gov (United States)

    Gong, Tao; Ding, Yongsheng; Xiong, Qin

    2014-05-01

    Human immune system is as important in keeping the body healthy as the brain in supporting the intelligence. However, the traditional models of the human immune system are built on the mathematics equations, which are not easy for students to understand. To help the students to understand the immune systems, a web-based e-learning approach with virtual lab is designed for the intelligent system control course by using new intelligent educational technology. Comparing the traditional graduate educational model within the classroom, the web-based e-learning with the virtual lab shows the higher inspiration in guiding the graduate students to think independently and innovatively, as the students said. It has been found that this web-based immune e-learning system with the online virtual lab is useful for teaching the graduate students to understand the immune systems in an easier way and design their simulations more creatively and cooperatively. The teaching practice shows that the optimum web-based e-learning system can be used to increase the learning effectiveness of the students.

  10. System for electrochemical investigations based on a PC and the Lab VIEW package

    Directory of Open Access Journals (Sweden)

    Stević Zoran

    2007-01-01

    Full Text Available This paper describes an electrochemical research system based on the Lab VIEW computer software package. An overview of well known electrochemical methods, such as potential measurements, chronopotentiometry, chronoamperometry, cyclic voltammetry and EIS is given. Electrochemical impedance spectroscopy has been adapted for systems containing large capacitances. For signal generation and recording of the response of the investigated electrochemical cell, a measurement and control system was developed, based on a PC P4 computer. The rest of the hardware consists of a commercially available AD-DA converter and an external interface for analog signal processing. The interface is a result of the authors own research. The software platform for the desired measurement methods is Lab VIEW package, which is regarded as a high standard in the area of modern virtual instruments. The developed system was adjusted, tested and compared with other commercially available systems. One such system is in constant use at the Technical Faculty in Bor.

  11. A Comparison of Field-Based and Lab-Based Experiments to Evaluate User Experience of Personalised Mobile Devices

    Directory of Open Access Journals (Sweden)

    Xu Sun

    2013-01-01

    Full Text Available There is a growing debate in the literature regarding the tradeoffs between lab and field evaluation of mobile devices. This paper presents a comparison of field-based and lab-based experiments to evaluate user experience of personalised mobile devices at large sports events. A lab experiment is recommended when the testing focus is on the user interface and application-oriented usability related issues. However, the results suggest that a field experiment is more suitable for investigating a wider range of factors affecting the overall acceptability of the designed mobile service. Such factors include the system function and effects of actual usage contexts aspects. Where open and relaxed communication is important (e.g., where participant groups are naturally reticent to communicate, this is more readily promoted by the use of a field study.

  12. Sales and database system for pump station based on LabVIEW%基于LabVIEW的输油站运销系统

    Institute of Scientific and Technical Information of China (English)

    吴宏斌

    2011-01-01

    输油站日常工作需要记录各罐的收输油数据.在LabVIEW环境下设计了一个输油站运销系统,并详细介绍了数据库及报表生成部分的开发方法.所开发的系统使用LabVIEW数据库工具包进行数据库操作,使用LabVIEW Office报告生成工具包生成报表.系统具有数据记录、存储历史数据的查询、修改、报表输出等功能.经应用检验,该系统可以完成输油站日常的数据录入、历史数据管理、日报表生成等工作.%The data saving of oil transportation is needed in pump station. In this paper sales and database system for pump station is built up based on LabVIEW and developing method of database system and report generation system is introduced in detail. LabVIEW Database Connectivity Toolkit is used for database operation. Report Generation Toolkit for Microsoft is applied for report generation. A series of functions is provided:data saving, history data searching,modifying, report generating. Evaluated by application, the system meets the requirements of the daily work such as record saving, history data management, daily report generation of the pump station.

  13. Research on expermiental teaching of mobile communication based on LabVIEW%基于LabVIEW的移动通信实验教学研究

    Institute of Scientific and Technical Information of China (English)

    刘严

    2013-01-01

    为了提高移动通信实验教学质量,减少实验室建设投入,提出了基于仿真软件LabVIEW的实验教学方法.通过应用LabVIEW图形化工程软件包,开发了多个综合虚拟仪器,用于开展验证性和综合性实验题目教学.控件模板提供了仿真度较高的各种仪器面板、按钮等电路器件,并且还可根据学生的需要自定义模块.实验结果表明基于LabVIEW软件仿真实验内容灵活、设计性强,既与基本理论相互补充,又能与硬件实验相互弥补,并节省了大量的设备资金,具有很好的推广价值.%To improve the teaching quality of the mobile communication experiment, and reduce the laboratory construction investment, an experimental teaching method is proposed based on the simulation software LabVIEW. Through the application of LabVIEW which is a graphical engineering software package, many comprehensive virtual instrument are designed, a lot of confirmatory and comprehensive experiment subjects are carried out . The control templates provide many circuit device such as instrument panel, button. The students can define the module according to their needs. The experimental results show that the software simulation experiment is with a flexible content, and not only combines with the basic theory, but also is complementary to hardware experiments. It saves a lot of equipment funds and has promotional value.

  14. Study on Hydraulic Control System of Rolling Mill Based on LabVIEW%基于LabVIEW的轧钢机液压控制系统研究

    Institute of Scientific and Technical Information of China (English)

    李文华; 张建卓; 李康康

    2012-01-01

    提出一种基于LabVIEW控制高速阀全开占空比,通过LabVIEW实时采集辊缝大小以作为反馈控制,同采集到的温度信号参数一起作为输入量,对轧钢机辊缝进行精确控制的思想.设计了流量控制策略与算法,并开发了LabVIEW程序框图和前面板.测试结果表明:高速阀全开过程中流过高速阀的液压油体积与实际所需的液压油体积拟合精度高,且形成了控制轧钢机辊缝的闭环控制系统.%A thought of controlling roll gap of rolling mill by controlling the duty cycle of full open of high-speed valve and collecting the roll gap as a feedback control together with the temperature signal as the input based on LabVIEW was proposed. The strategy and algorithm were designed. The LabVIEW block diagram and front panel were developed. The experiment shows that the volume of hydraulic oil flowing through the valve in the full open is closed to the practical required. And a closed-loop controlling system of controlling the roll gap of the rolling mill is formed.

  15. Vision Lab

    Data.gov (United States)

    Federal Laboratory Consortium — The Vision Lab personnel perform research, development, testing and evaluation of eye protection and vision performance. The lab maintains and continues to develop...

  16. GridLAB-D: An Agent-Based Simulation Framework for Smart Grids

    Directory of Open Access Journals (Sweden)

    David P. Chassin

    2014-01-01

    Full Text Available Simulation of smart grid technologies requires a fundamentally new approach to integrated modeling of power systems, energy markets, building technologies, and the plethora of other resources and assets that are becoming part of modern electricity production, delivery, and consumption systems. As a result, the US Department of Energy’s Office of Electricity commissioned the development of a new type of power system simulation tool called GridLAB-D that uses an agent-based approach to simulating smart grids. This paper presents the numerical methods and approach to time-series simulation used by GridLAB-D and reviews applications in power system studies, market design, building control system design, and integration of wind power in a smart grid.

  17. A New PC and LabVIEW Package Based System for Electrochemical Investigations.

    Science.gov (United States)

    Stević, Zoran; Andjelković, Zoran; Antić, Dejan

    2008-03-15

    The paper describes a new PC and LabVIEW software package based system forelectrochemical research. An overview of well known electrochemical methods, such aspotential measurements, galvanostatic and potentiostatic method, cyclic voltammetry andEIS is given. Electrochemical impedance spectroscopy has been adapted for systemscontaining large capacitances. For signal generation and recording of the response ofinvestigated electrochemical cell, a measurement and control system was developed, basedon a PC P4. The rest of the hardware consists of a commercially available AD-DA converterand an external interface for analog signal processing. The interface is a result of authorsown research. The software platform for desired measurement methods is LabVIEW 8.2package, which is regarded as a high standard in the area of modern virtual instruments. Thedeveloped system was adjusted, tested and compared with commercially available systemand ORCAD simulation.

  18. [The research in a foot pressure measuring system based on LabVIEW].

    Science.gov (United States)

    Li, Wei; Qiu, Hong; Xu, Jiang; He, Jiping

    2011-01-01

    This paper presents a system of foot pressure measuring system based on LabVIEW. The designs of hardware and software system are figured out. LabVIEW is used to design the application interface for displaying plantar pressure. The system can realize the plantar pressure data acquisition, data storage, waveform display, and waveform playback. It was also shown that the testing results of the system were in line with the changing trend of normal gait, which conformed to human system engineering theory. It leads to the demonstration of system reliability. The system gives vivid and visual results, and provides a new method of how to measure foot-pressure and some references for the design of Insole System.

  19. 基于LabVIEW的火炮振动测试分析系统%Artillery Vibration Measurement and Analysis System Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    张华; 管红根; 桂成兵

    2012-01-01

    Aiming at the influence problem of traditional artillery vibration test system to various interference factor under adverse launch environment, a vibration testing analysis system based on LabVIEW is designed. Adopt virtual programming software LabVIEW, based on the process vibration signal acquisition and processing technology, supplemented by the virtual instrument technology and computer technology, design the virtual vibration test and analysis of artillery system constitution and software constitution, and use hammer hitting method to make hammer hitting test for artillery's pipeline. The experimental results indicate that the virtual artillery vibration test system is well of artillery running, with higher precision and stability, can reduce the cost of artillery vibration test.%针对在恶劣的发射环境下,各种干扰因素对火炮的传统测试系统影响较大等问题,设计一种基于LabVIEW的振动测试分析系统.采用虚拟编程软件LabVIEW,以工程振动信号采集和处理技术为基础,辅以虚拟技术和计算机技术,对虚拟火炮振动测试分析系统的构成及软件构成进行设计,并用锤击法对火炮身管进行锤击测试验证.实验结果表明:该虚拟火炮振动测试分析系统运行结果良好,具有较高的测试精度和稳定性,能降低火炮振动测试成本.

  20. Craniux: A LabVIEW-Based Modular Software Framework for Brain-Machine Interface Research

    Directory of Open Access Journals (Sweden)

    Alan D. Degenhart

    2011-01-01

    Full Text Available This paper presents “Craniux,” an open-access, open-source software framework for brain-machine interface (BMI research. Developed in LabVIEW, a high-level graphical programming environment, Craniux offers both out-of-the-box functionality and a modular BMI software framework that is easily extendable. Specifically, it allows researchers to take advantage of multiple features inherent to the LabVIEW environment for on-the-fly data visualization, parallel processing, multithreading, and data saving. This paper introduces the basic features and system architecture of Craniux and describes the validation of the system under real-time BMI operation using simulated and real electrocorticographic (ECoG signals. Our results indicate that Craniux is able to operate consistently in real time, enabling a seamless work flow to achieve brain control of cursor movement. The Craniux software framework is made available to the scientific research community to provide a LabVIEW-based BMI software platform for future BMI research and development.

  1. Design, fabrication and characterization of drug delivery systems based on lab-on-a-chip technology.

    Science.gov (United States)

    Nguyen, Nam-Trung; Shaegh, Seyed Ali Mousavi; Kashaninejad, Navid; Phan, Dinh-Tuan

    2013-11-01

    Lab-on-a-chip technology is an emerging field evolving from the recent advances of micro- and nanotechnologies. The technology allows the integration of various components into a single microdevice. Microfluidics, the science and engineering of fluid flow in microscale, is the enabling underlying concept for lab-on-a-chip technology. The present paper reviews the design, fabrication and characterization of drug delivery systems based on this amazing technology. The systems are categorized and discussed according to the scales at which the drug is administered. Starting with the fundamentals on scaling laws of mass transfer and basic fabrication techniques, the paper reviews and discusses drug delivery devices for cellular, tissue and organism levels. At the cellular level, a concentration gradient generator integrated with a cell culture platform is the main drug delivery scheme of interest. At the tissue level, the synthesis of smart particles as drug carriers using lab-on-a-chip technology is the main focus of recent developments. At the organism level, microneedles and implantable devices with fluid-handling components are the main drug delivery systems. For drug delivery to a small organism that can fit into a microchip, devices similar to those of cellular level can be used.

  2. Robust thermal control for CMOS-based lab-on-chip systems

    Science.gov (United States)

    Martinez-Quijada, Jose; Ma, Tianchi; Hall, Gordon H.; Reynolds, Matt; Sloan, David; Caverhill-Godkewitsch, Saul; Glerum, D. Moira; Sameoto, Dan; Elliott, Duncan G.; Backhouse, Christopher J.

    2015-07-01

    The need for precise temperature control at small scales has provided a formidable challenge to the lab-on-chip community. It requires, at once, good thermal conductivity for high speed operation, good thermal isolation for low power consumption and the ability to have small (mm-scale) thermally independent regions on the same substrate. Most importantly, and, in addition to these conflicting requirements, there is a need to accurately measure the temperature of the active region without the need for device-to-device calibrations. We have developed and tested a design that enables thermal control of lab-on-chip devices atop silicon substrates in a way that could be integrated with the standard methods of mass-manufacture used in the electronics industry (i.e. CMOS). This is a significant step towards a single-chip lab-on-chip solution, one in which the microfluidics, high voltage electronics, optoelectronics, instrumentation electronics, and the world-chip interface are all integrated on a single substrate with multiple, independent, thermally-controlled regions based on active heating and passive cooling.

  3. A digital frequency stabilization system of external cavity diode laser based on LabVIEW FPGA

    Science.gov (United States)

    Liu, Zhuohuan; Hu, Zhaohui; Qi, Lu; Wang, Tao

    2015-10-01

    Frequency stabilization for external cavity diode laser has played an important role in physics research. Many laser frequency locking solutions have been proposed by researchers. Traditionally, the locking process was accomplished by analog system, which has fast feedback control response speed. However, analog system is susceptible to the effects of environment. In order to improve the automation level and reliability of the frequency stabilization system, we take a grating-feedback external cavity diode laser as the laser source and set up a digital frequency stabilization system based on National Instrument's FPGA (NI FPGA). The system consists of a saturated absorption frequency stabilization of beam path, a differential photoelectric detector, a NI FPGA board and a host computer. Many functions, such as piezoelectric transducer (PZT) sweeping, atomic saturation absorption signal acquisition, signal peak identification, error signal obtaining and laser PZT voltage feedback controlling, are totally completed by LabVIEW FPGA program. Compared with the analog system, the system built by the logic gate circuits, performs stable and reliable. User interface programmed by LabVIEW is friendly. Besides, benefited from the characteristics of reconfiguration, the LabVIEW program is good at transplanting in other NI FPGA boards. Most of all, the system periodically checks the error signal. Once the abnormal error signal is detected, FPGA will restart frequency stabilization process without manual control. Through detecting the fluctuation of error signal of the atomic saturation absorption spectrum line in the frequency locking state, we can infer that the laser frequency stability can reach 1MHz.

  4. Craniux: a LabVIEW-based modular software framework for brain-machine interface research.

    Science.gov (United States)

    Degenhart, Alan D; Kelly, John W; Ashmore, Robin C; Collinger, Jennifer L; Tyler-Kabara, Elizabeth C; Weber, Douglas J; Wang, Wei

    2011-01-01

    This paper presents "Craniux," an open-access, open-source software framework for brain-machine interface (BMI) research. Developed in LabVIEW, a high-level graphical programming environment, Craniux offers both out-of-the-box functionality and a modular BMI software framework that is easily extendable. Specifically, it allows researchers to take advantage of multiple features inherent to the LabVIEW environment for on-the-fly data visualization, parallel processing, multithreading, and data saving. This paper introduces the basic features and system architecture of Craniux and describes the validation of the system under real-time BMI operation using simulated and real electrocorticographic (ECoG) signals. Our results indicate that Craniux is able to operate consistently in real time, enabling a seamless work flow to achieve brain control of cursor movement. The Craniux software framework is made available to the scientific research community to provide a LabVIEW-based BMI software platform for future BMI research and development.

  5. AirLab: a cloud-based platform to manage and share antibody-based single-cell research.

    Science.gov (United States)

    Catena, Raúl; Özcan, Alaz; Jacobs, Andrea; Chevrier, Stephane; Bodenmiller, Bernd

    2016-06-29

    Single-cell analysis technologies are essential tools in research and clinical diagnostics. These methods include flow cytometry, mass cytometry, and other microfluidics-based technologies. Most laboratories that employ these methods maintain large repositories of antibodies. These ever-growing collections of antibodies, their multiple conjugates, and the large amounts of data generated in assays using specific antibodies and conditions makes a dedicated software solution necessary. We have developed AirLab, a cloud-based tool with web and mobile interfaces, for the organization of these data. AirLab streamlines the processes of antibody purchase, organization, and storage, antibody panel creation, results logging, and antibody validation data sharing and distribution. Furthermore, AirLab enables inventory of other laboratory stocks, such as primers or clinical samples, through user-controlled customization. Thus, AirLab is a mobile-powered and flexible tool that harnesses the capabilities of mobile tools and cloud-based technology to facilitate inventory and sharing of antibody and sample collections and associated validation data.

  6. Phosphonium-based ionic liquids and uses

    Energy Technology Data Exchange (ETDEWEB)

    Del Sesto, Rico E; Koppisch, Andrew T; Lovejoy, Katherine S; Purdy, Geraldine M

    2014-12-30

    Phosphonium-based room temperature ionic liquids ("RTILs") were prepared. They were used as matrices for Matrix-Assisted Laser Desorption Ionization (MALDI) mass spectrometry and also for preparing samples of dyes for analysis.

  7. Data Collection System for Laser Power Based on LabVIEW%基于LabVIEW的激光功率数据采集系统

    Institute of Scientific and Technical Information of China (English)

    薛竣文; 裴雪丹; 苏秉华; 孙鲁; 赵慧元; 苏禹

    2012-01-01

    Based on LabVIEW graphic design language a data collection system for laser power is designed to solve the problem of diode-pumped all-solid-state laser long term stability of laser power.Laser power meter used to convert optical parameter to electric parameter is designed by silicon photocell.The filter,attenuation glass and ground glass have to be selected carefully in order to make the photocell work in the unsaturated linear region.A micro control unit of STC89C52RC is used to manage the signal.The computer communicates with micro control unit by serial mode.Data collection interface is programmed by LabVIEW.The data collection system for the long term stability of laser power is realized at last.%针对全固体激光器的长期功率稳定性检测问题,设计并实现了基于LabVIEW图形设计语言的激光功率数据采集系统。采用光电池制作的激光功率计来实现光功率到电学参量的转换,通过合理的选取激光功率计的滤光片、衰减片和毛玻璃,保证光电池工作在非饱和的线性区。使用STC89C52RC单片机对采集到的信号进行处理,计算机与单片机采用串口通讯,数据采集界面程序采用LabVIEW编写,最终实现了激光功率长期稳定性监测系统的设计、调试与制作。

  8. 基于LabVIEW的电机自动测试系统%Motor Automatic Testing System Based on the LabVIEW

    Institute of Scientific and Technical Information of China (English)

    刘龙; 于忠亚

    2011-01-01

    虚拟仪器是现代计算机技术和仪器技术相结合的产物,把虚拟仪器引入实验教学已成为一种必然趋势。基于虚拟仪器技术,针对目前电机性能测试中存在的操作复杂,准确度和效率低等问题,提出了一种基于LabVIEW的硬件组成和软件设计的电机试验系统。该系统通过采集电机的电压和电流等参数,利用LabVIEW软件设计开发了电机调速和测速系统,得到电机的各项性能参数。实践证明该系统具有操作简单,准确度高和效率高等特点。%Virtual instrument is the outcome of modern computer technology and instrument technique,and the introduction of virtual instrument into the experimental teaching has become an inevitable trend.With the virtual instrument technology,this paper proposes the motor testing system based on the LabVIEW hardware composition and software design,in view of the drawbacks of present motor performance testing,such as complex operation,low accuracy and efficiency.Various performance parameters of motor can be got through collecting the parameters of electric pressure and current,using the LabVIEW software and developing motor speed control and gun system.It is proved that this system has the advantages of simple operation,high accuracy and efficiency.

  9. Remote experimental platform for motor based on LabVIEW%基于 LabVIEW 的远程电机实验台的构建

    Institute of Scientific and Technical Information of China (English)

    罗建; 雷勇; 黄昊; 李蓉; 张茜

    2014-01-01

    Aiming at the teaching reform of the motor laboratory ,a remote experimental system is built based on LabVIEW as the software platform with TCP/IP and DataSocket communication protocol and single-chip technology to realize remote monitoring and control .Different functions and types of experiment to the system with LabVIEW subpanel technology and modular programming ideas can be added easily .Experimental results show that the system runs stably and it can complete a variety of different types of motor experiment .Also it can extend to other teaching experiments .The system has a good interactive interface and it can provide new ideas and means for the construction of modern laboratory and experimental teaching reform .%针对电机实验室的教学改革,利用TCP/IP、DataSocket通信协议、单片机技术实现远程检测和控制建立了以LabVIEW为软件平台的远程实验系统。利用LabVIEW子面板技术和模块化编程思想,能方便地对不同类型的功能和实验进行添加。实验结果表明:系统运行稳定,能够完成多种不同类型的电机实验,能扩展到其他课程的教学实验中,系统具有良好的人机界面,同时也为现代化实验室建设和实验教学改革提供了新思路和手段。

  10. Measure, Then Show: Grasping Human Evolution Through an Inquiry-Based, Data-driven Hominin Skulls Lab.

    Science.gov (United States)

    Bayer, Chris N; Luberda, Michael

    2016-01-01

    Incomprehension and denial of the theory of evolution among high school students has been observed to also occur when teachers are not equipped to deliver a compelling case also for human evolution based on fossil evidence. This paper assesses the outcomes of a novel inquiry-based paleoanthropology lab teaching human evolution to high-school students. The inquiry-based Be a Paleoanthropologist for a Day lab placed a dozen hominin skulls into the hands of high-school students. Upon measuring three variables of human evolution, students explain what they have observed and discuss findings. In the 2013/14 school year, 11 biology classes in 7 schools in the Greater New Orleans area participated in this lab. The interviewed teacher cohort unanimously agreed that the lab featuring hominin skull replicas and stimulating student inquiry was a pedagogically excellent method of delivering the subject of human evolution. First, the lab's learning path of transforming facts to data, information to knowledge, and knowledge to acceptance empowered students to themselves execute part of the science that underpins our understanding of deep time hominin evolution. Second, although challenging, the hands-on format of the lab was accessible to high-school students, most of whom were readily able to engage the lab's scientific process. Third, the lab's exciting and compelling pedagogy unlocked higher order thinking skills, effectively activating the cognitive, psychomotor and affected learning domains as defined in Bloom's taxonomy. Lastly, the lab afforded students a formative experience with a high degree of retention and epistemic depth. Further study is warranted to gauge the degree of these effects.

  11. Vapor cell based sodium laser guide star mechanism study lab-bench

    Science.gov (United States)

    Wang, Hongyan; Li, Lihang; Luo, Ruiyao; Li, Lei; Ning, Yu; Xi, Fengjie; Xu, Xiaojun

    2016-07-01

    Sodium laser guide star (LGS) is the key for the success of modern adaptive optics (AO) supported large ground based telescopes, however, for many field applications, Sodium LGS's brightness is still a limited factor. Large amounts of theoretical efforts have been paid to optimize Sodium LGS exciting parameters, that is, to fully discover potential of harsh environment surrounding mesospheric extreme thin sodium atoms under resonant excitation, whether quantum or Monte Carlo based. But till to now, only limited proposals are demonstrated with on-sky test due to the high cost and engineering complexities. To bridge the gap between theoretical modeling and on-sky test, we built a magnetic field controllable sodium cell based lab-bench, which includes a small scale sum-frequency single mode 589nm laser, with added amplitude, polarization, and phase modulators. We could perform quantitative resonant fluorescence study under single, multi-frequency, side-band optical re-pumping exciting with different polarization, also we could perform optical field modulation to study Larmor precession which is considered as one of devils of Sodium LGS, and we have the ability to generate beams contain orbital angular moment. Our preliminary sodium cell based optical re-pumping experiments have shown excellent consistence with Bloch equation predicted results, other experimental results will also be presented in the report, and these results will give a direct support that sodium cell based lab-bench study could help a Sodium LGS scientists a lot before their on-sky test.

  12. A LabVIEW based template for user created experiment automation.

    Science.gov (United States)

    Kim, D J; Fisk, Z

    2012-12-01

    We have developed an expandable software template to automate user created experiments. The LabVIEW based template is easily modifiable to add together user created measurements, controls, and data logging with virtually any type of laboratory equipment. We use reentrant sequential selection to implement sequence script making it possible to wrap a long series of the user created experiments and execute them in sequence. Details of software structure and application examples for scanning probe microscope and automated transport experiments using custom built laboratory electronics and a cryostat are described.

  13. New photomultiplier active base for Hall C Jefferson Lab lead tungstate calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Popov, Vladimir E. [JLAB; Mkrtchyan, Hamlet G. [Artem Alikhanian National Laboratory

    2012-11-01

    A new photomultiplier tube active base was designed and tested. The base combines active voltage division circuit and fast amplifier, powered by the current flowing through voltage divider. This base is developed to upgrade older photomultiplier bases of Jefferson Lab lead-tungsten calorimeter (about ˜1200 crystals of PbWO{sub 4} from the PrimEx experimental setup). This is needed for the extension of detectors' rate capability to meet requirements of new Hall C proposal PR12-11-102 of measurements of the L/T separated cross sections and their ratio R = πL/πT in neutral-pion p(e,e'π0)p deep exclusive and p(p(e,e'π{sup 0})p)X semi-inclusive scattering regions. New active base is direct replacement of older passive base circuit without adding of additional power or signal lines. However, it extends detectors rate capability with factor over 20. Moreover, transistorized voltage divider improves detector's amplitude resolution due to reduction of photomultiplier gain dependence from tube anode current. The PMT active base is the invention disclosed in V. Popov's U.S. Patent No. 6,791,269, which successfully works over ten years in several Jefferson Lab Cherenkov detectors. The following design is a new revised and improved electronic circuit with better gain stability and linearity in challenge to meet requirements of new Hall C experimental setup. New active base performance was tested using fast LED light source and Pr:LuAG scintillator and gamma sources. Electronics radiation hardness was tested on JLab accelerator. Results of testing R4125 Hamamatsu photomultiplier tube in new active base are presented.

  14. Lab-chip HPLC with integrated droplet-based microfluidics for separation and high frequency compartmentalisation.

    Science.gov (United States)

    Kim, Jin-Young; Cho, Soong-Won; Kang, Dong-Ku; Edel, Joshua B; Chang, Soo-Ik; deMello, Andrew J; O'Hare, Danny

    2012-09-21

    We demonstrate the integration of a droplet-based microfluidic device with high performance liquid chromatography (HPLC) in a monolithic format. Sequential operations of separation, compartmentalisation and concentration counter were conducted on a monolithic chip. This describes the use of droplet-based microfluidics for the preservation of chromatographic separations, and its potential application as a high frequency fraction collector.

  15. WPAN and PSO based Water Quality Monitoring with LabVIEW as data logger

    Directory of Open Access Journals (Sweden)

    Anita Gehlot

    2015-10-01

    Full Text Available Earth is only resource for drinking water, with a huge amount of unexploited elements which lies under the earth. This water purifies by using different purifying techniques at the government end also at consumers end. But the most of the purifiers which are used by the middle class families of India, does not provides any mean of monitoring the quality of water. As a result most of the people use the same purifier for years without service, which ultimately results in more contaminated water. This paper proposes a WPAN based system for monitoring the water quality of the water purifier, and real time data acquisition on LabVIEW. An automated procedure is proposed to determine the total dissolved in the water and the data collected from the system is displayed on LCD as well as the same data acquired by the handheld device. Then whole data is analysed using LabVIEW. This system indicates the danger level on the bases of input range of the sensor. The system has advantages such as early warning of the contaminated water and the same time purifier services person can collect the data and on time service of the water purifier can be maintained.

  16. Radial pressure sensor of sucker rod based on LabVIEW

    Science.gov (United States)

    Wang, Zhongyu; Yan, Hu; Li, Qiang

    2013-10-01

    The eccentric wear, fracture and other phenomena often occur to the sucker rod in major oil fields. It turns out that the radial pressure of sucker rod suffered is the main reason for its eccentric wear. It is necessary to analyze the eccentric wear and fracture of sucker rod in the pumping process. It is also important to measure the radial pressure for the downhole sucker rod accurately. The radial pressure could be analyzed when sucker rod is extruded, collided or sustained friction based on the material mechanics and the fluid dynamics. The mechanical structure is designed for measuring the radial pressure. The data processing system for radial pressure of down-hole sucker rod based on LabVIEW is developed in this paper. The functions are real-time data acquisition and processing for sucker rod radial pressure. The communication of LabVIEW and Access database had been realized. The database management system for radial pressure of sucker rod is built, which could be used to achieve the data storage, historical data retrieval analysis, data organization and calculation. The computer simulation is carried out to verify the reasonability of the theoretical analysis and structure design.

  17. Development of LabVIEW web-based simulator for RELAP5

    Energy Technology Data Exchange (ETDEWEB)

    Macedo, Luiz A.; Torres, Walmir M.; Sabundjian, Gaiane; Andrade, Delvonei A.; Belchior Junior, Antonio; Umbehaun, Pedro E.; Conti, Thadeu N.; Mesquita, Roberto N. de; Masotti, Paulo H.F.; Angelo, Gabriel, E-mail: lamacedo@ipen.b, E-mail: wmtorres@ipen.b, E-mail: gdjian@ipen.b, E-mail: delvonei@ipen.b, E-mail: abelchior@ipen.b, E-mail: umbehaun@ipen.b, E-mail: tnconti@ipen.b, E-mail: rnavarro@ipen.b, E-mail: , E-mail: masotti@ipen.b, E-mail: gabriel.angelo@usp.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2011-07-01

    This work presents the development of a LabVIEW web-based simulator using the output results of the best estimate nuclear system analysis code, RELAP5, for graphical user interfaces and web-casting. A numerical based model designed for natural circulation studies on the thermal hydraulic experimental facility called Natural Circulation Circuit, was developed with RELAP5 code. Specific output results from RELAP5 simulation are displayed in a user friendly graphical format. The temperatures are shown as a function of time in a XY graphic. Temperatures, levels and void fractions are displayed in color-coded scale which change in time on the graphical interface representing the circuit. An alarm is set for the case of onset boiling temperature occurrence at the heater outlet. This simulator allows an easy visual understanding of the thermal hydraulic circuit behavior. It can be shared, via Web, with researchers in any geographical location and, at the same time, it can be used in learning for distance educational purposes. In future work, this LabVIEW simulator will be coupled with RELAP5 code through dll's. Simultaneous graphical displaying and code calculations will be possible. Results are presented and discussed. (author)

  18. Design of Monitoring System for Air Compressors Based on LabVIEW%基于LabVIEW的压风机组监控系统设计

    Institute of Scientific and Technical Information of China (English)

    李高磊; 郑晓亮

    2015-01-01

    Mainly research the monitoring system for mine air compressors ,with the base of the analysis of characteristics of the existing unit air compressors on the basis of the monitoring system, a compressed air unit online monitoring system based on LabVIEW has been set up. The system consists of sensors, signal acquisition card, PLC, inverter and PC monitor screen. Realization of the state unit of the wind pressure parameters real-time online acquisition, real-time control, storage, display and warning, and rely on DataSocket technology enables remote monitoring.%以煤矿压风机组监控系统为研究对象,在分析现有压风机组监控系统特点的基础上,搭建了基于LabVIEW的压风机组在线监控系统。该系统包括传感器、信号采集卡、PLC、变频器和上位机监控界面。实现了对压风机组的状态参数的实时在线采集、实时控制、存储、显示与预警,并依靠DataSocket技术实现了远程监控。

  19. Design and Application of Strain Measurement System Based on LabVIEW%基于LabVIEW的应变测量系统的设计与应用

    Institute of Scientific and Technical Information of China (English)

    马志燕

    2014-01-01

    A system of strain measurement based on virtual instrument is designed,and it com-bines the advantages of virtual instrument and Lab VIEW software.Based on the principle of strain measurement,hardware and software framework of strain measurement system is designed case study in test of warp tension,and The advantages of this measuring system is verified over traditional sys-tems.Results show that the system has advantages of simple structure,convenient operation,and which can give full play to the powerful advantage of computer in data calculation,transmission,stor-age and display.%结合虚拟仪器及其 LabVIEW软件的优点,设计了一种基于虚拟仪器的应变测量系统。在应变测量原理的基础上,以经纱张力测试为例设计了应变测量系统的软硬件结构,验证了该测量系统较传统系统的优越性。结果表明,系统硬件结构简单,操作方便,同时能够充分发挥计算机在数据计算、传输、存储和显示等方面的巨大优势。

  20. Bio-based liquid crystalline polyesters

    Science.gov (United States)

    Wilsens, Carolus; Rastogi, Sanjay; Dutch Collaboration

    2013-03-01

    The reported thin-film polymerization has been used as a screening method in order to find bio-based liquid crystalline polyesters with convenient melting temperatures for melt-processing purposes. An in depth study of the structural, morphological and chemical changes occurring during the ongoing polycondensation reactions of these polymers have been performed. Structural and conformational changes during polymerization for different compositions have been followed by time resolved X-ray and Infrared spectroscopy. In this study, bio-based monomers such as vanillic acid and 2,5-furandicarboxylic acid are successfully incorporated in liquid crystalline polyesters and it is shown that bio-based liquid crystalline polymers with high aromatic content and convenient processing temperatures can be synthesized. Special thanks to the Dutch Polymer Institute for financial support

  1. Continuous Sensing Photonic Lab-on-a-Chip Platform Based on Cross-Linked Enzyme Crystals.

    Science.gov (United States)

    Conejero-Muriel, Mayte; Rodríguez-Ruiz, Isaac; Verdugo-Escamilla, Cristóbal; Llobera, Andreu; Gavira, José A

    2016-12-06

    Microfluidics or lab-on-a-chip technology offer clear advantages over conventional systems such as a dramatic reduction of reagent consumption or a shorter analysis time, which are translated into cost-effective systems. In this work, we present a photonic enzymatic lab-on-a-chip reactor based on cross-linked enzyme crystals (CLECs), able to work in continuous flow, as a highly sensitive, robust, reusable, and stable platform for continuous sensing with superior performance as compared to the state of the art. The microreactor is designed to facilitate the in situ crystallization and crystal cross-linking generating enzymatically active material that can be stored for months/years. Thus, and by means of monolithically integrated micro-optics elements, continuous enzymatic reactions can be spectrophotometrically monitored. Lipase, an enzyme with industrial significance for catalyzed transesterification, hydrolysis, and esterification reactions, is used to demonstrate the potential of the microplatforms as both a continuous biosensor and a microreactor for the synthesis of high value compounds.

  2. [A quick algorithm of dynamic spectrum photoelectric pulse wave detection based on LabVIEW].

    Science.gov (United States)

    Lin, Ling; Li, Na; Li, Gang

    2010-02-01

    Dynamic spectrum (DS) detection is attractive among the numerous noninvasive blood component detection methods because of the elimination of the main interference of the individual discrepancy and measure conditions. DS is a kind of spectrum extracted from the photoelectric pulse wave and closely relative to the artery blood. It can be used in a noninvasive blood component concentration examination. The key issues in DS detection are high detection precision and high operation speed. The precision of measure can be advanced by making use of over-sampling and lock-in amplifying on the pick-up of photoelectric pulse wave in DS detection. In the present paper, the theory expression formula of the over-sampling and lock-in amplifying method was deduced firstly. Then in order to overcome the problems of great data and excessive operation brought on by this technology, a quick algorithm based on LabVIEW and a method of using external C code applied in the pick-up of photoelectric pulse wave were presented. Experimental verification was conducted in the environment of LabVIEW. The results show that by the method pres ented, the speed of operation was promoted rapidly and the data memory was reduced largely.

  3. Interactive Appl ication Based on Arduino and LabVIEW+LINX%Arduino 和 LabVIEW + LINX 的互动应用

    Institute of Scientific and Technical Information of China (English)

    俞新农; 俞健雄

    2014-01-01

    上位机使用 LabVIEW 软件,下位机使用 Arduino 控制板,借助于 LabVIEW Hacker LINX 工具包,可以很方便地使用 LabVIEW 软件与 Arduino 控制板实现交互设计。把这个工具包和 LabVIEW 软件结合起来,通过 LabVIEW 软件就可以实现对 Arduino 控制板的控制或者与 Arduino 控制板交换数据,并且 Arduino 控制板只需写入固件(Firmware),不需要用户编应用程序。由于 LINX 只需要对 LabVIEW 图形化编程,而无需 Arduino 编程,甚至不需要底层硬件知识,因此适合了解 LabVIEW 编程而不懂 Arduino 编程的使用者。%When host computer uses LabVIEW and lower computer uses Arduino control plate,it is quite easy to make use of LabVIEW and Arduino control plate to realize the interactive design by LabVIEW Hacker LINX toolkit.Combining the toolkit and LabVIEW, control of Arduino control plate or data exchange with Arduino control plate can be implemented via LabVIEW so long as Arduino is written in Firmware.Because nothing but LabVIEW graphical programming is needed by LINX,LINX is suitable for the users who know about LabVIEW programming and do not understand Arduino programming.

  4. Collection and Pretreatment of Transient Electromagnetic Data Based on LabVIEW%基于LabVIEW的瞬变电磁数据采集及预处理

    Institute of Scientific and Technical Information of China (English)

    许婕; 娄奔月; 张剑英; 袁源; 郭英兰; 童敏明

    2011-01-01

    采用瞬变电磁法勘探到的信号中包含大量的强干扰信号,如不剔除强干扰信号,反演得到的计算结果误差较大.针对该问题,提出了一种基于LabV砸W的瞬变电磁数据采集及预处理系统的设计方案.该系统采用数据采集卡USB2089采集二次涡流场信号,并将其转换为计算机能处理的数字信号,然后通过LabVIEW平台的功能流程、功能算法剔除数字信号中的强干扰信号,从而实现对瞬变电磁数据的有效采集.仿真结果表明,该系统可剔除瞬变电磁数据中的强干扰信号,保证了数据采集的准确性.%It has a lot of strong interference signals in signals explored by transient electromagnetic method. If the strong interference signals can't be eliminated, error of calculating result will be big. So the paper proposed a design scheme of collection and pretreatment system of transient electromagnetic data based on LabVIEW. The system uses data collection card USB2089 to collect secondary turbulence field signal and transfer the signal to digital signal that can be processed by computer, then uses function flow and function algorithm of LabVIEW platform to eliminate strong interference signal of the digital signal,so as to realize effective collection of transient electromagnetic data. The simulation result showed that the system can eliminate strong interference signal in transient electromagnetic data and ensures accuracy of collected data.

  5. Liquid-infiltrated photonic crystals - enhanced light-matter interactions for lab-on-a-chip applications

    CERN Document Server

    Mortensen, Niels Asger; Pedersen, Jesper

    2007-01-01

    Optical techniques are finding widespread use in analytical chemistry for chemical and bio-chemical analysis. During the past decade, there has been an increasing emphasis on miniaturization of chemical analysis systems and naturally this has stimulated a large effort in integrating microfluidics and optics in lab-on-a-chip microsystems. This development is partly defining the emerging field of optofluidics. Scaling analysis and experiments have demonstrated the advantage of micro-scale devices over their macroscopic counterparts for a number of chemical applications. However, from an optical point of view, miniaturized devices suffer dramatically from the reduced optical path compared to macroscale experiments, e.g. in a cuvette. Obviously, the reduced optical path complicates the application of optical techniques in lab-on-a-chip systems. In this paper we theoretically discuss how a strongly dispersive photonic crystal environment may be used to enhance the light-matter interactions, thus potentially compen...

  6. The Mysterious Death: An HPLC Lab Experiment. An Undergraduate Forensic Lab

    Science.gov (United States)

    Beussman, Douglas J.

    2007-01-01

    A high-performance liquid chromatography (HPLC) laboratory experiment based on the separation of four prescription drugs (disopyramide, lidocaine, procainamide, and quinidine) is presented. The experiment is set within the forensic science context of the discovery of a patient's mysterious death where a drug overdose is suspected. Each lab group…

  7. The Mysterious Death: An HPLC Lab Experiment. An Undergraduate Forensic Lab

    Science.gov (United States)

    Beussman, Douglas J.

    2007-01-01

    A high-performance liquid chromatography (HPLC) laboratory experiment based on the separation of four prescription drugs (disopyramide, lidocaine, procainamide, and quinidine) is presented. The experiment is set within the forensic science context of the discovery of a patient's mysterious death where a drug overdose is suspected. Each lab group…

  8. 基于LabVIEW的CAN总线UDS诊断工具开发%Development of CAN bus UDS diagnostic tool based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    游长能

    2016-01-01

    CAN总线是汽车上应用最广泛的通讯总线之一,在带CAN总线ECU的软硬件开发、产线测试、整车组装与调试过程中诊断协议是不可或缺的一种工具,通过诊断协议可以实现ECU的在线程序烧录、功能校准、内部错误和诊断码的读取和清除等功能.目前应用最广泛的诊断协议是UDS诊断协议.本文介绍了一种基于LabView的CAN总线UDS诊断工具开发.%CAN bus communication bus is one of the most widely used diagnostic protocol,assembled in hardware and software development,CAN bus ECU production line test,vehicle and debugging process is an indispensable tool, through the diagnostic protocol ECU can achieve the online program recording function, calibration, and internal error diagnosis codes read and clear functions.At present,the most widely used diagnostic protocol is UDS diagnostic protocol. In this paper, a LabView based CAN bus UDS diagnostic tool is introduced.

  9. 基于LabVIEW的人体生理参数采集系统设计%Design of LabVIEW-based acquisition system for human physiological parameters

    Institute of Scientific and Technical Information of China (English)

    张凌飞; 王圣禹; 郑黄敏; 王雪梅

    2014-01-01

    In order to enable people to understand their own physiological parameters in time,a human physiological pa-rameter acquisition system based on virtual instrument was designed. The method to compile system software with LabVIEW, the system hardware composed of sensor,alignment circuit and data acquisition card as well as the method to display the temper-ature,pulse wave and heart rate on the PC screen are described in this paper briefly. Experimental results shows that this sys-tem achieves good effect.%为了使人们能更加及时地了解自己的一些生理参数,设计了一种基于虚拟仪器的人体生理参数采集系统。在此简单叙述了利用LabVIEW编写系统软件,由传感器、调理电路和数据采集卡构成系统硬件,并将采集到体温、脉搏波和心率显示在PC机上的原理和方法。通过实践,系统达到了较好的效果。

  10. Based on LabVIEW's Malus' Law Experiment%基于LabVIEW的“马吕斯定律验证”实验

    Institute of Scientific and Technical Information of China (English)

    王建中; 黄林; 王伶俐; 王应辉

    2011-01-01

    In this paper,the author makes an improvement in based on Pasco's the "Malus Law" experiment.The researcher has taken the experiment with the LabVIEW program control PASCO system Science Work shop 750 data acquisition in conjunction with the application of the optical sensor CI-6504 to verify the Malus law.The experimental data has been processed by the Origin software.As the result,the experimental curve is in good agreement with the theoretical relationship.%对基于PASCO的"马吕斯定律验证"实验进行了改进。利用编写的LabVIEW程序控制PASCO实验系统的ScienceWorkshop 750数据采集器,同时结合光传感器CI-6504验证马吕斯定律,实验数据用Origin软件进行处理,所得实验曲线与理论关系符合较好。

  11. 基于Lab VIEW的虚拟光伏实验系统设计%Design of virtual photovoltaic experimental system based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    李志军; 刘爽; 张轩涛; 秦晓雪; 刘汉征

    2016-01-01

    The experimental system of virtual photovoltaic was built based on virtual LabVIEW software technology,by using the characteristics of photovoltaic cell and its mathematical model,and the photovoltaic cell characteristics,photovoltaic power generation process,virtual photovoltaic MPPT and other teaching links to demonstrate the process of experiment were designed and implemented.The virtual photovoltaic experimental system is convenient and reliable,and the image of the experimental interface is friendly.Because it gets rid of the hardware limit,it is safe and economical to realize the experimental teaching and scientific research work.%基于 LabVIEW软件技术,利用光伏电池的特性及其数学模型,构建了虚拟光伏实验系统,设计并实现了光伏电池特性、光伏发电过程、虚拟 MPPT等多种教学环节演示实验。虚拟光伏实验系统使用方便、可靠,实验界面形象、友好。由于不受硬件条件限制,可以安全、经济地进行各项实验教学和科研工作。

  12. Research of GIPB bus test and control system based on LabVIEW%基于LabVIEW的GPIB总线测控系统研究

    Institute of Scientific and Technical Information of China (English)

    马辉; 邢超

    2012-01-01

    在实验研究中经常会同时需要用到多种不同性质的仪器,完成电源控制、信号发生器、数据采集和显示等实际任务,在此详述了一种基于基于LabVIEW的GPIB总线测控系统的组成与程序设计,与传统方法相比该系统提高了测试速度,方便了分析、存储数据.对从事自动测试软件设计者具有极高的参考价值.%a variety of different nature instruments are often needed simultaneously during the experimental study to complete the actual tasks of power control, signal generation, data acquisition and display, etc. The composition and program design of GPIB bus test and control system based on LabVIEW are elaborated in this paper. Compared with traditional methods, this system enhanced the testing speed and simplified the data analysis and storage. The research result has a certain reference value to the relevant designers engaged in autometic testing software design.

  13. A PC-based shutter glasses controller for visual stimulation using multithreading in LabWindows/CVI.

    Science.gov (United States)

    Gramatikov, Ivan; Simons, Kurt; Guyton, David; Gramatikov, Boris

    2017-05-01

    Amblyopia, commonly known as "lazy eye," is poor vision in an eye from prolonged neurologic suppression. It is a major public health problem, afflicting up to 3.6% of children, and will lead to lifelong visual impairment if not identified and treated in early childhood. Traditional treatment methods, such as occluding or penalizing the good eye with eye patches or blurring eye drops, do not always yield satisfactory results. Newer methods have emerged, based on liquid crystal shutter glasses that intermittently occlude the better eye, or alternately occlude the two eyes, thus stimulating vision in the "lazy" eye. As yet there is no technology that allows easy and efficient optimization of the shuttering characteristics for a given individual. The purpose of this study was to develop an inexpensive, computer-based system to perform liquid crystal shuttering in laboratory and clinical settings to help "wake up" the suppressed eye in amblyopic patients, and to help optimize the individual shuttering parameters such as wave shape, level of transparency/opacity, frequency, and duty cycle of the shuttering. We developed a liquid crystal glasses controller connected by USB cable to a PC computer. It generates the voltage waveforms going to the glasses, and has potentiometer knobs for interactive adjustments by the patient. In order to achieve good timing performance in this bidirectional system, we used multithreading programming techniques with data protection, implemented in LabWindows/CVI. The hardware and software developed were assessed experimentally. We achieved an accuracy of ±1Hz for the frequency, and ±2% for the duty cycle of the occlusion pulses. We consider these values to be satisfactory for the purpose of optimizing the visual stimulation by means of shutter glasses. The system can be used for individual optimization of shuttering attributes by clinicians, for training sessions in clinical settings, or even at home, aimed at stimulating vision in the

  14. A Discovery-Based Experiment Involving Rearrangement in the Conversion of Alcohols to Alkyl Halides: Permanent Magnet [to the thirteenth power]C NMR in the First-Semester Organic Chemistry Lab

    Science.gov (United States)

    Kjonaas, Richard A.; Tucker, Ryand J. F.

    2008-01-01

    The use of permanent magnet [to the thirteenth power]C NMR in large-section first-semester organic chemistry lab courses is limited by the availability of experiments that not only hinge on first-semester lecture topics, but which also produce at least 0.5 mL of neat liquid sample. This article reports a discovery-based experiment that meets both…

  15. A New Remote Monitoring System Application in Laser Power Based on LabVIEW

    Directory of Open Access Journals (Sweden)

    Liu Gaoqiang

    2016-01-01

    Full Text Available In this paper, a new remote monitoring system based on LabVIEW was proposed to measure laser power automatically and remotely. This system consists of four basic components: an DH-JG2 optical power meter, a NI-USB 6008 data acquisition card, a personal computer (PC, and HP laserJet 1020 Plus printer. Since power output of laser is generally so unstable that abnormal work situation could not retroaction to inspectors right away, new system was designed to solve this problem. The detection system realized function of remote control by TCP protocol and mobile phone. Laser power curve that is measured by detection system demonstrated that the design has a good performance in real-time detection and operability.

  16. A novel blinding digital watermark algorithm based on lab color space

    Science.gov (United States)

    Dong, Bing-feng; Qiu, Yun-jie; Lu, Hong-tao

    2010-02-01

    It is necessary for blinding digital image watermark algorithm to extract watermark information without any extra information except the watermarked image itself. But most of the current blinding watermark algorithms have the same disadvantage: besides the watermarked image, they also need the size and other information about the original image when extracting the watermark. This paper presents an innovative blinding color image watermark algorithm based on Lab color space, which does not have the disadvantages mentioned above. This algorithm first marks the watermark region size and position through embedding some regular blocks called anchor points in image spatial domain, and then embeds the watermark into the image. In doing so, the watermark information can be easily extracted after doing cropping and scale change to the image. Experimental results show that the algorithm is particularly robust against the color adjusting and geometry transformation. This algorithm has already been used in a copyright protecting project and works very well.

  17. Wet Lab Accelerator: A Web-Based Application Democratizing Laboratory Automation for Synthetic Biology.

    Science.gov (United States)

    Bates, Maxwell; Berliner, Aaron J; Lachoff, Joe; Jaschke, Paul R; Groban, Eli S

    2017-01-20

    Wet Lab Accelerator (WLA) is a cloud-based tool that allows a scientist to conduct biology via robotic control without the need for any programming knowledge. A drag and drop interface provides a convenient and user-friendly method of generating biological protocols. Graphically developed protocols are turned into programmatic instruction lists required to conduct experiments at the cloud laboratory Transcriptic. Prior to the development of WLA, biologists were required to write in a programming language called "Autoprotocol" in order to work with Transcriptic. WLA relies on a new abstraction layer we call "Omniprotocol" to convert the graphical experimental description into lower level Autoprotocol language, which then directs robots at Transcriptic. While WLA has only been tested at Transcriptic, the conversion of graphically laid out experimental steps into Autoprotocol is generic, allowing extension of WLA into other cloud laboratories in the future. WLA hopes to democratize biology by bringing automation to general biologists.

  18. A lab-based ambient pressure x-ray photoelectron spectrometer with exchangeable analysis chambers

    Energy Technology Data Exchange (ETDEWEB)

    Newberg, John T., E-mail: jnewberg@udel.edu; Arble, Chris; Goodwin, Chris; Khalifa, Yehia; Broderick, Alicia [Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716 (United States); Åhlund, John [Scienta AB, Box 15120, 750 15 Uppsala (Sweden)

    2015-08-15

    Ambient pressure X-ray photoelectron spectroscopy (APXPS) is a powerful spectroscopy tool that is inherently surface sensitive, elemental, and chemical specific, with the ability to probe sample surfaces under Torr level pressures. Herein, we describe the design of a new lab-based APXPS system with the ability to swap small volume analysis chambers. Ag 3d(5/2) analyses of a silver foil were carried out at room temperature to determine the optimal sample-to-aperture distance, x-ray photoelectron spectroscopy analysis spot size, relative peak intensities, and peak full width at half maximum of three different electrostatic lens modes: acceleration, transmission, and angular. Ag 3d(5/2) peak areas, differential pumping pressures, and pump performance were assessed under varying N{sub 2}(g) analysis chamber pressures up to 20 Torr. The commissioning of this instrument allows for the investigation of molecular level interfacial processes under ambient vapor conditions in energy and environmental research.

  19. A mirror for lab-based quasi-monochromatic parallel x-rays.

    Science.gov (United States)

    Nguyen, Thanhhai; Lu, Xun; Lee, Chang Jun; Jung, Jin-Ho; Jin, Gye-Hwan; Kim, Sung Youb; Jeon, Insu

    2014-09-01

    A multilayered parabolic mirror with six W/Al bilayers was designed and fabricated to generate monochromatic parallel x-rays using a lab-based x-ray source. Using this mirror, curved bright bands were obtained in x-ray images as reflected x-rays. The parallelism of the reflected x-rays was investigated using the shape of the bands. The intensity and monochromatic characteristics of the reflected x-rays were evaluated through measurements of the x-ray spectra in the band. High intensity, nearly monochromatic, and parallel x-rays, which can be used for high resolution x-ray microscopes and local radiation therapy systems, were obtained.

  20. Model-based strategy for cell culture seed train layout verified at lab scale.

    Science.gov (United States)

    Kern, Simon; Platas-Barradas, Oscar; Pörtner, Ralf; Frahm, Björn

    2016-08-01

    Cell culture seed trains-the generation of a sufficient viable cell number for the inoculation of the production scale bioreactor, starting from incubator scale-are time- and cost-intensive. Accordingly, a seed train offers potential for optimization regarding its layout and the corresponding proceedings. A tool has been developed to determine the optimal points in time for cell passaging from one scale into the next and it has been applied to two different cell lines at lab scale, AGE1.HN AAT and CHO-K1. For evaluation, experimental seed train realization has been evaluated in comparison to its layout. In case of the AGE1.HN AAT cell line, the results have also been compared to the formerly manually designed seed train. The tool provides the same seed train layout based on the data of only two batches.

  1. A mirror for lab-based quasi-monochromatic parallel x-rays

    Energy Technology Data Exchange (ETDEWEB)

    Nguyen, Thanhhai; Lu, Xun; Lee, Chang Jun; Jeon, Insu, E-mail: i-jeon@chonnam.ac.kr [School of Mechanical Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757 (Korea, Republic of); Jung, Jin-Ho [Pro-optics Co., Ltd., 475 Ami-ri, Bubal-eup, Icheon 467-866 (Korea, Republic of); Jin, Gye-Hwan [Department of Radiology, Nambu University, 76 Chumdan Jungang 1-ro, Gwangsan-gu, Gwangju 506-706 (Korea, Republic of); Kim, Sung Youb [School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology, 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan 689-798 (Korea, Republic of)

    2014-09-15

    A multilayered parabolic mirror with six W/Al bilayers was designed and fabricated to generate monochromatic parallel x-rays using a lab-based x-ray source. Using this mirror, curved bright bands were obtained in x-ray images as reflected x-rays. The parallelism of the reflected x-rays was investigated using the shape of the bands. The intensity and monochromatic characteristics of the reflected x-rays were evaluated through measurements of the x-ray spectra in the band. High intensity, nearly monochromatic, and parallel x-rays, which can be used for high resolution x-ray microscopes and local radiation therapy systems, were obtained.

  2. A Smart Mobile Lab-on-Chip-Based Medical Diagnostics System Architecture Designed For Evolvability

    DEFF Research Database (Denmark)

    Patou, François; Dimaki, Maria; Svendsen, Winnie Edith

    2015-01-01

    Unprecedented knowledge levels in life sciences along with technological advances in micro- and nanotechnologies and microfluidics have recently conditioned the advent of Lab-on-Chip (LoC) devices for In-Vitro Medical Testing (IVMT). Combined with smart-mobile technologies, LoCs are pervasively...... giving rise to opportunities to better diagnose disease, predict and monitor personalised treatment efficacy, or provide healthcare decision-making support at the Point-of-Care (PoC). Although made increasingly available to the consumer market, the adoption of LoC-based PoC In-Vitro Medical Testing (IVMT......) systems is still in its infancy. This attrition partly pertains to the intricacy of designing and developing complex systems, destined to be used sporadically, in a fast-pace evolving technological paradigm. System evolvability is therefore key in the design process and constitutes the main motivation...

  3. A LabVIEW-Based Virtual Instrument System for Laser-Induced Fluorescence Spectroscopy.

    Science.gov (United States)

    Wu, Qijun; Wang, Lufei; Zu, Lily

    2011-01-01

    We report the design and operation of a Virtual Instrument (VI) system based on LabVIEW 2009 for laser-induced fluorescence experiments. This system achieves synchronous control of equipment and acquisition of real-time fluorescence data communicating with a single computer via GPIB, USB, RS232, and parallel ports. The reported VI system can also accomplish data display, saving, and analysis, and printing the results. The VI system performs sequences of operations automatically, and this system has been successfully applied to obtain the excitation and dispersion spectra of α-methylnaphthalene. The reported VI system opens up new possibilities for researchers and increases the efficiency and precision of experiments. The design and operation of the VI system are described in detail in this paper, and the advantages that this system can provide are highlighted.

  4. Remote Fault Information Acquisition and Diagnosis System of the Combine Harvester Based on LabVIEW

    Science.gov (United States)

    Chen, Jin; Wu, Pei; Xu, Kai

    Most combine harvesters have not be equipped with online fault diagnosis system. A fault information acquisition and diagnosis system of the Combine Harvester based on LabVIEW is designed, researched and developed. Using ARM development board, by collecting many sensors' signals, this system can achieve real-time measurement, collection, displaying and analysis of different parts of combine harvesters. It can also realize detection online of forward velocity, roller speed, engine temperature, etc. Meanwhile the system can judge the fault location. A new database function is added so that we can search the remedial measures to solve the faults and also we can add new faults to the database. So it is easy to take precautions against before the combine harvester breaking down then take measures to service the harvester.

  5. Controlling software development of CW terahertz target scattering properties measurements based on LabVIEW

    Science.gov (United States)

    Fan, Chang-Kun; Li, Qi; Zhou, Yi; Zhao, Yong-Peng; Chen, De-Ying

    2016-10-01

    With the development of terahertz technology and increasing studies on terahertz target scattering properties, research on terahertz target scattering properties measurements attracts more and more attention. In this paper, to solve problems in the detection process, we design a controlling software for Continuous-Wave (CW) terahertz target scattering properties measurements. The software is designed and programmed based on LabVIEW. The software controls the whole system, involving the switch between the target and the calibration target, the rotation of target, collection, display and storage of the initial data and display, storage of the data after the calibration process. The experimental results show that the software can accomplish the expected requirement, enhance the speed of scattering properties measurements and reduce operation errors.

  6. Monitoring Software Design Based on Linux and LabWindows/CVI%基于Linux和LabWindows/CVI的监控软件设计

    Institute of Scientific and Technical Information of China (English)

    王斌; 强盛; 张雪; 李巍

    2013-01-01

    针对传统监控系统监控对象单一、网络服务不完善、智能化程度不高等问题,设计并实现了一种下位机以i.MX53处理器为核心,嵌入式Linux作为嵌入式操作系统;上位机采用LabWindows/CVI开发,上下位机遵照自拟的网络通信协议通信的远程监控系统.采用Linux下进程间通信、LabWindows/CVI与MySQL数据库通信、多线程和基于ActiveX生成报表等技术,实现了信号采集、报文传输、数据存储和实时显示等功能.测试结果表明,该系统用户界面仿Win8风格,远程视频监控平均延时1.45 s,报警正确率达98.2%,具有一定的推广和使用价值.%The traditional monitoring system was only applicable to a monitoring object,poor in network services and not high degree of intelligence.In order to solve these questions,a remote monitoring system based on i.MX53 as the core microcontroller was designed and realized.Linux was used as its operating system in the lower computer part,and LabWindows/CVI was used as development platform in the upper computer part.The two parts was communicated through the private network communication protocol.Several technologies were adopted such as inter-process communication under the Linux,MySQL database communication,multithread technology,and generating data report based on ActiveX etc.The system realizes the signal collection,message transmission,data storage and real-time display and other functions.Test results show that the system has imitation Win8 style of user interface,the average delay of 1.45 s in remote control,and alarm accuracy of 98.2%,so it has some practical value.

  7. 基于FPGA和LabVIEW的双通道示波器设计%Design of Dual-channel Oscilloscope Based on FPGA and LabVIEW

    Institute of Scientific and Technical Information of China (English)

    叶凯

    2012-01-01

    As the traditional oscilloscope is more expensive and it is difficult to preserve data for a long time,the design of dual -channel oscilloscope, which is based on LabVIEW and FPGA, is proposed. By way of signal attenuation and the AD9288 analog-digital conversion, the Cyeione series FPGA is adopted as its core to collect value of dual-channel inputting signal. Through the computer parallel port,the dynamic link library is invoked to the corresponding driver to achieve the communication between acquisition board and PC. Through the virtual oscilloscope based on LabVIEW, waveform curve can be collected by real-time program-controlled display, which reads the history of the acquired waveform. The system is user-defined on design parameters. A single - chip in the system, lest range from - 20 to + 20V, which runs stably, is used to fulfill the main logic function and the interface is use - friendly.%针对传统示波器价格昂贵且采集数据不能长久保存等问题,设计了一种基于FPGA和LabVIEW的双通道示波器.以Cyclone系列FPGA为核心,通过信号衰减及AD9288模数转换,采集双通道输入信号值;通过计算机并口,调用动态链接库对应驱动程序,实现采集板与PC机通信;通过LabvIEW设计的虚拟示波器实时程控显示采集的波形曲线和读取历史的采集波形.整个系统设计参数自定义,单芯片完成系统主要逻辑功能,测试范围为-20~+20 V,运行稳定性强,且方便用户操作使用.

  8. Vibration test system for finisher cantilever based on LabVIEW%基于LabVIEW的光饰机悬臂梁振动测试系统

    Institute of Scientific and Technical Information of China (English)

    侯志敏; 邓东花; 夏薇

    2012-01-01

    Based on the graphical virtual instrument programming platform of American NI Company, a virtual vibration measurement instrument is developed for cantilever of finisher. The design of the programming is introduced, including the hardware and software. The system has function of real-time data acquisition, time-frequency domain analysis, data storage and playback.%以基于美国NI公司的LabVIEW为开发平台,针对光饰机悬臂梁的振动,开发了虚拟机械振动信号测试仪,包括虚拟振动仪器的软硬件组成及程序设计,可完成振动信号的实时采集、时域频域分析,以及数据存储和回放功能.

  9. Ionic liquid based dispersive liquid-liquid microextraction of aromatic amines in water samples

    Institute of Scientific and Technical Information of China (English)

    Yun Chang Fan; Zheng Liang Hu; Mei Lan Chen; Chao Shen Tu; Yan Zhu

    2008-01-01

    In this work, a new microextraction method termed ionic liquid based dispersive liquid-liquid microextraction (IL-DLLME) was demonstrated for the extraction of 2-methylaniline, 4-chloroaniline, 1-naphthylamine and 4-aminobiphenyl in aqueous matrices. After extraction the ionic liquid (IL) phase was injected directly into the high performance liquid chromatography (HPLC) system for determination. Some parameters that might affect the extraction efficiency were optimized. Under the optimum conditions, good linear relationship, sensitivity and reproducibility were obtained. The limits of detection (LOD, S/N = 3) for the four analytes were in the range of 0.45-2.6 μg L-1. The relative standard deviations (R.S.D., n = 6) were in the range of 6.2-9.8%. This method was applied for the analysis of the real water samples. The recoveries ranged from 93.4 to 106.4%. The main advantages of the method are high speed, high recovery, good repeatability and volatile organic solvent-free.

  10. Optofluidic-Tunable Color Filters And Spectroscopy Based On Liquid-Crystal Microflows

    Energy Technology Data Exchange (ETDEWEB)

    Cuennet, J. G. [Swiss Federal Institute of Technology in Lausanne (EPFL) (Switzerland); Vasdekis, Andreas E. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Psaltis, D. [Swiss Federal Institute of Technology in Lausanne (EPFL) (Switzerland)

    2013-05-24

    The integration of color filters with microfluidics has attracted substantial attention in recent years, for on-chip absorption, fluorescence, or Raman analysis. We describe such tunable filters based on the micro-flow of liquid crystals. The filter operation is based on the wavelength dependent liquid crystal birefringence that can be tuned by modifying the flow velocity field in the microchannel. The latter is possible both temporally and spatially by varying the inlet pressure and the channel geometry respectively. We explored the use of these optofluidic filters for on-chip absorption spectroscopy; by integrating the distance dependent color filter with a dye-filled micro-channel, the absorption spectrum of a dye could be measured. Liquid crystal microflows simplify substantially the optofluidic integration, actuation and tuning of color filters for lab-on-a-chip spectroscopic applications.

  11. Developing a new power quality analysis software based on LabVIEW%基于LabVIEW的新型电能质量分析软件开发

    Institute of Scientific and Technical Information of China (English)

    韩烨; 刘志刚; 李文帆

    2012-01-01

    传统电能质量检测装置大多采用DSP技术,开发周期长,功能单一.基于LabVIEW虚拟仪器开发平台,开发一种新型的电能质量分析软件,可利用FFT、STFT、WT、HHT等多种现代信号处理方法对电能质量信号进行分析,并利用状态机结构实现人机交互.检测结果表明,软件既能分析电能质量的稳态指标,又能检测电能质量的暂态扰动,操作简单,多种功能,界面友好,具有广泛的使用前景.%DSP technology is used in most of traditional power quality detection devices, with long development cycle and limited functions. Based on Lab VIEW virtual instrument development platform, a new type of power quality analysis software is developed. Transformation-based methods such as FFT, STFT and HHT are adopted to analyze power quality signals, using state machine architecture to achieve human-computer interaction. The test results show that the software can not only analyze the steady-state indexes of power quality, but also detect the transient disturbance signal. There are some advantages such as simple operations, friendly interface, multi-functions and so on, which make the software have an extensive application prospect.

  12. Livinggreen Labs: A report on the development of a co design-based engagement method

    NARCIS (Netherlands)

    Franken, V.; Geelen, D.V.; Meijer, S.A.; Kersten, W.C.

    2013-01-01

    The publication in front of you presents the full results of the six Livinggreen Labs that have been organised during the course of the Livinggreen.eu project. The primary goal of these Labs was to develop and test a methodology to engage stakeholders, including end-users, in sustainable renovation

  13. MethLAB: a graphical user interface package for the analysis of array-based DNA methylation data.

    Science.gov (United States)

    Kilaru, Varun; Barfield, Richard T; Schroeder, James W; Smith, Alicia K; Conneely, Karen N

    2012-03-01

    Recent evidence suggests that DNA methylation changes may underlie numerous complex traits and diseases. The advent of commercial, array-based methods to interrogate DNA methylation has led to a profusion of epigenetic studies in the literature. Array-based methods, such as the popular Illumina GoldenGate and Infinium platforms, estimate the proportion of DNA methylated at single-base resolution for thousands of CpG sites across the genome. These arrays generate enormous amounts of data, but few software resources exist for efficient and flexible analysis of these data. We developed a software package called MethLAB (http://genetics.emory.edu/conneely/MethLAB) using R, an open source statistical language that can be edited to suit the needs of the user. MethLAB features a graphical user interface (GUI) with a menu-driven format designed to efficiently read in and manipulate array-based methylation data in a user-friendly manner. MethLAB tests for association between methylation and relevant phenotypes by fitting a separate linear model for each CpG site. These models can incorporate both continuous and categorical phenotypes and covariates, as well as fixed or random batch or chip effects. MethLAB accounts for multiple testing by controlling the false discovery rate (FDR) at a user-specified level. Standard output includes a spreadsheet-ready text file and an array of publication-quality figures. Considering the growing interest in and availability of DNA methylation data, there is a great need for user-friendly open source analytical tools. With MethLAB, we present a timely resource that will allow users with no programming experience to implement flexible and powerful analyses of DNA methylation data.

  14. Lab-on-a-chip based biosensor for the real-time detection of aflatoxin.

    Science.gov (United States)

    Uludag, Yıldız; Esen, Elif; Kokturk, Guzin; Ozer, Hayrettin; Muhammad, Turghun; Olcer, Zehra; Basegmez, H Imge Oktay; Simsek, Senay; Barut, Serkan; Gok, M Yagmur; Akgun, Mete; Altintas, Zeynep

    2016-11-01

    Polymers were synthesized and utilized for aflatoxin detection coupled with a novel lab-on-a-chip biosensor: MiSens and high performance liquid chromatography (HPLC). Non-imprinted polymers (NIPs) were preferred to be designed and used due to the toxic nature of aflatoxin template and also to avoid difficult clean-up protocols. Towards an innovative miniaturized automated system, a novel biochip has been designed that consists of 6 working electrodes (1mm diameter) with shared reference and counter electrodes. The aflatoxin detection has been achieved by a competition immunoassay that has been performed using the new biochips and the automated MiSens electrochemical biosensor device. For the assay, aflatoxin antibody has been captured on the Protein A immobilized electrode. Subsequently the sample and the enzyme-aflatoxin conjugate mixture has been injected to the electrode surfaces. The final injection of the enzyme substrate results in an amperometric signal. The sensor assays for aflatoxin B1 (AFB1) in different matrices were also performed using enzyme link immunosorbent assay (ELISA) and HPLC for confirmation. High recovery was successfully achieved in spiked wheat samples using NIP coupled HPLC and NIP coupled MiSens biosensor [2ppb of aflatoxin was determined as 1.86ppb (93% recovery), 1.73ppb (86.5% recovery), 1.96ppb (98% recovery) and 1.88ppb (94.0% recovery) for immunoaffinity column (IAC)-HPLC, NIP-HPLC, Supel™ Tox SPE Cartridges (SUP)-HPLC and NIP-MiSens, respectively]. Aflatoxin detection in fig samples were also investigated with MiSens biosensor and the results were compared with HPLC method. The new biosensor allows real-time and on-site detection of AFB1 in foods with a rapid, sensitive, fully automated and miniaturized system and expected to have an immense economic impact for food industry.

  15. 基于LabVIEW的随动系统仿真平台的实现%Realization of a Simulation Platform for the Servo System Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    崔平; 田作华; 马彦

    2001-01-01

    Based on LabVIEW, a development platform of virtual instrumentsoftware by National Instruments Co., U.S. and Runge Kutta algorithm of ordinary differential equations, this paper proposses a method for developing anexperimental simulation platform for servo systems using the basic library functions of LabVIEW. This method proves inexpensive as it does not require Control and Simulation Toolbox of LabVIEW. Keyword following-up system LabVIEW Runge Kutta algorithm%基于美国NI公司的虚拟仪器软件开发平台LabVIEW及微分方程的龙格库塔算法,本文介绍了利用LabVIEW的基本库函数开发随动系统仿真实验平台的方法。该方法不需要借助LabVIEW昂贵的仿真工具箱,节省了开发费用。

  16. 基于LabVIEW的PCI数据采集系统设计%Design of PCI data acquisition system based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    贾佳

    2012-01-01

    A virtual instrument system is established by using Lab VIEW and PCI data acquisition card. This paper introduced the operation process of calling PCI data acquisition card driving function by Lab VIEW CLF node, and the development of Lab VIEW block diagram. The instrument has the ability of data acquisition, waveform display, overload alarm, data storage, and so on.%利用虚拟仪器技术与PCI数据采集卡构建了一个虚拟仪器系统.详细介绍了通过LabVIEW CLF节点调用PCI数据采集卡驱动函数的操作过程,以及LabVIEW程序框图的开发流程.该仪器具有数据采集、波形显示、超限报警、数据存储等功能.

  17. Virtual Instrument Design Based on LabVIEW and MATLAB%基于LabVIEW和MATLAB设计的虚拟仪器

    Institute of Scientific and Technical Information of China (English)

    仇成群

    2008-01-01

    虚拟仪器编程软件LabVIEW结合计算功能强大的MATLAB将大大提高虚拟仪器的设计功能.专业工具箱是MATLAB的特色,功能强大.在虚拟编程软件LabVIEW中结合MATLAB工具箱就能够设计出独具特色的虚拟仪器.分析了LabVIEW中如何调用MATLAB脚本节点以及MATLAB工具箱的应用.还给出了MATLAB在LabVIEW设计机器人六维腕力传感器系统的动态标定虚拟仪器中的应用,表明了MATLAB工具软件使LabVIEW设计虚拟仪器更为方便有效.

  18. Advanced applications of the LabVIEW based on dynamic link libraries%基于动态链接库的LabVIEW高级应用

    Institute of Scientific and Technical Information of China (English)

    叶子郁; 朱目成

    2005-01-01

    本文论述了基于动态链接库的LabVIEW两种高级应用,一是在LabVIEW中使用 Call Library Function函数来调用其它语言产生的动态链接库函数;二是利用LabVIEW生成各种动态链接库函数,方便其它语言程序调用.并结合具体实例,介绍了调用方法.基于该种方法可以扩充LabVIEW的应用范围和扩展LabVIEW的功能.

  19. A communication between LabVIEW and Word based on ActiveX technology%基于ActiveX技术的LabVIEW与Word通信实现

    Institute of Scientific and Technical Information of China (English)

    张仁辉

    2007-01-01

    本文介绍了一种使用ActiveX技术完成LabVIEW与Word通信的方法.文中首先介绍了相关的概念,然后对LabVIEW中通过ActiveX调用Word进行了介绍,介绍了常用Word对象模型,并对Word文档在LabVIEW中的显示以及LabVIEW对Word事件的响应进行了详细介绍,最后在前文基础上给出了一个较完整的实例具体阐述了使用ActiveX实现LabVIEW与Word通信的实现方法.

  20. Design of Stress Test System Based on LabVIEW%基于LabVIEW的应力检测系统设计

    Institute of Scientific and Technical Information of China (English)

    霍淑珍

    2014-01-01

    During modern production process of electronic product,there are many operations on the bare PCB boards such as programming or testing. In those operations,there may be some stress to PCB which making the PCB damage. In order to test this stress,a stress test system based on NI LabVIEW and SCXI DAQ was designed. This system could be used to measure the stress on the PCB,when it was manufactured on the production line. Monitoring the stress on the production line can minimize the damage caused by big stress.%在现代化的电子产品生产过程中,经常需要对已经焊接好元器件的PCB板进行操作,如测试编程等,这些操作中的较大的应力会对PCB产品产生破坏作用。为了检测该应力的大小,以NI公司的图像化软件LabVIEW及该公司的SCXI等数据采集单元为基础开发了PCB产品的应力检测系统,该系统能够检测PCB生产过程中各个环节对所操作的PCB产品产生的应力的大小,控制PCB产品所受应力在允许的范围内。

  1. 基于LabVIEW平台的网球鹰眼系统%Tennis Hawkeye system based on LabVIEW platform

    Institute of Scientific and Technical Information of China (English)

    常超

    2016-01-01

    To overcome the limitation and blind area of human vision,and improve the fairness of the tennis match,a ten⁃nis Hawkeye system based on LabVIEW platform was designed. The camera is calibrated by quantum particle swarm optimiza⁃tion algorithm to shoot the image. The filtering,denoising and discrete centralization of the image is conducted by Matlab,and then 3D matching is conducted to the image. The tennis motion locus is obtained by Gauss fitting to establish the virtual scene of the tennis motion. The experimental results show that the system has fast computation speed and high accuracy,and can meet the design requirements.%为了克服人类视觉的极限和盲区,提高网球比赛的公允性,设计了一种基于LabVIEW平台的网球鹰眼系统。通过量子粒子群优化算法对摄像机进行标定,拍摄图像,利用Matlab对图像进行滤波、去噪及离散中心化,并对其进行三维匹配,最后通过高斯拟合获得网球运动轨迹,完成对网球运动虚拟场景的搭建。实验结果表明,该系统计算速度快,准确率高,满足设计要求。

  2. 基于LabVIEW的SAW滤波器测试系统%SAW Filter Testing System Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    2016-01-01

    以虚拟仪器的核心技术PXI总线为基础,利用LabVIEW作为软件开发平台,设计了一种SAW(声表面波)滤波器测试系统,并详细介绍了系统的硬件结构及软件设计.通过实验验证,系统可以有效地测试SAW滤波器的中心频率、插入损耗、带外抑制、通带纹波等主要性能指标,以及实现数据的自动存储,平均每支滤波器的测试时间为3.2~4 s.该系统测试方法简单,可靠性高,在SAW滤波器的工业化生产测试中具有良好的应用前景.%A testing system for SAW filter was introduced taking LabVIEW as the software development platform and the hard-ware based on PXI bus technology.The structure of the hardware and function characteristic of the software were described.Through experiment,the system can test the main performance of the SAW filter such as center frequency,insertion loss,band rejection,rip-ple and so on,realizing automatic storage of data.The time of testing one filter was 3.2~4 s.The system features convenient opera-tion,reliable testing and has a good prospect in SAW filter industrial production.

  3. Design of Virtual Digital Storage Oscilloscope based on LabVIEW%基于LabVIEW的虚拟数字存储示波器的设计

    Institute of Scientific and Technical Information of China (English)

    部德才; 张永平

    2014-01-01

    A virtual digital storage oscilloscope based on sound card is designed and developed by using the powerful data acquisition, processing and program design features of LabVIEW. This virtual digital storage oscilloscope consists of signal input, data processing and waveform-display and wave storage modules, and realizes the display and measurement and other functions through software programming. It also integrates with a virtual signal generator which can be switched between sound card input and virtual signal input. The experiment results show that the virtual oscilloscope has realized the functions of traditional oscilloscope and performs better in precision and reliability and that it can be used for ordinary laboratory with normal requirements.%利用 LabVIEW 强大的数据采集、处理和程序设计功能,设计、开发了一款数字存储示波器。它主要是由信号输入模块、数据处理模块和波形显示及存储模块组成,是通过软件编程实现信号的显示和测量等功能的。在虚拟示波器上集成的虚拟信号发生器可以在声卡采集和虚拟信号输入之间切换。实验结果表明,该虚拟示波器基本实现了传统示波器的功能,并且运行可靠、性能良好,能够满足普通实验室正常的使用需求。

  4. Recent advancements in chemical luminescence-based lab-on-chip and microfluidic platforms for bioanalysis.

    Science.gov (United States)

    Mirasoli, Mara; Guardigli, Massimo; Michelini, Elisa; Roda, Aldo

    2014-01-01

    Miniaturization of analytical procedures through microchips, lab-on-a-chip or micro total analysis systems is one of the most recent trends in chemical and biological analysis. These systems are designed to perform all the steps in an analytical procedure, with the advantages of low sample and reagent consumption, fast analysis, reduced costs, possibility of extra-laboratory application. A range of detection technologies have been employed in miniaturized analytical systems, but most applications relied on fluorescence and electrochemical detection. Chemical luminescence (which includes chemiluminescence, bioluminescence, and electrogenerated chemiluminescence) represents an alternative detection principle that offered comparable (or better) analytical performance and easier implementation in miniaturized analytical devices. Nevertheless, chemical luminescence-based ones represents only a small fraction of the microfluidic devices reported in the literature, and until now no review has been focused on these devices. Here we review the most relevant applications (since 2009) of miniaturized analytical devices based on chemical luminescence detection. After a brief overview of the main chemical luminescence systems and of the recent technological advancements regarding their implementation in miniaturized analytical devices, analytical applications are reviewed according to the nature of the device (microfluidic chips, microchip electrophoresis, lateral flow- and paper-based devices) and the type of application (micro-flow injection assays, enzyme assays, immunoassays, gene probe hybridization assays, cell assays, whole-cell biosensors). Copyright © 2013 Elsevier B.V. All rights reserved.

  5. LabVIEW-based control software for para-hydrogen induced polarization instrumentation

    Energy Technology Data Exchange (ETDEWEB)

    Agraz, Jose, E-mail: joseagraz@ucla.edu; Grunfeld, Alexander; Li, Debiao [Department of Bioengineering, University of California, Los Angeles, California 91791 (United States); BIRI, Cedars Sinai Medical Center, West Hollywood, California 90048 (United States); Cunningham, Karl [Ectron Corp, San Diego, California 92111 (United States); Willey, Cindy [Harris Corp, San Diego, California 92154 (United States); Pozos, Robert [Department of Biology, San Diego State University, San Diego, California 92182 (United States); Wagner, Shawn [BIRI, Cedars Sinai Medical Center, West Hollywood, California 90048 (United States)

    2014-04-15

    The elucidation of cell metabolic mechanisms is the modern underpinning of the diagnosis, treatment, and in some cases the prevention of disease. Para-Hydrogen induced polarization (PHIP) enhances magnetic resonance imaging (MRI) signals over 10 000 fold, allowing for the MRI of cell metabolic mechanisms. This signal enhancement is the result of hyperpolarizing endogenous substances used as contrast agents during imaging. PHIP instrumentation hyperpolarizes Carbon-13 ({sup 13}C) based substances using a process requiring control of a number of factors: chemical reaction timing, gas flow, monitoring of a static magnetic field (B{sub o}), radio frequency (RF) irradiation timing, reaction temperature, and gas pressures. Current PHIP instruments manually control the hyperpolarization process resulting in the lack of the precise control of factors listed above, resulting in non-reproducible results. We discuss the design and implementation of a LabVIEW based computer program that automatically and precisely controls the delivery and manipulation of gases and samples, monitoring gas pressures, environmental temperature, and RF sample irradiation. We show that the automated control over the hyperpolarization process results in the hyperpolarization of hydroxyethylpropionate. The implementation of this software provides the fast prototyping of PHIP instrumentation for the evaluation of a myriad of {sup 13}C based endogenous contrast agents used in molecular imaging.

  6. A proposed VUV oscillator-based FEL upgrade at Jefferson Lab

    Energy Technology Data Exchange (ETDEWEB)

    Benson, S. V. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Douglas, D. R. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Evtushenko, P. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Hannon, F. E. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Hernandez-Garcia, C. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Klopf, J. M. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Legg, R. A. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Neil, G. R. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Shinn, M. D. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Tennant, C. D. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Zhang, S. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Williams, G. P. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

    2011-09-20

    Advances in superconducting linac technology offer the possibility of an upgrade of the Jefferson Lab Free Electron Laser (JLab FEL) facility to an oscillator-based VUV-FEL that would produce 6 x 10{sup 12} coherent 100 eV photons per pulse at multi-MHz repetition rates in the fundamental. At present JLab operates a pair of oscillator-based continuous-wave Free Electron Lasers (FELs) as a linac-based next generation light source in the IR and UV, with sub-picosecond pulses up to 75 MHz. Harmonics upwards of 10 eV are produced and the fully coherent nature of the source results in peak and average brightness values that are several orders of magnitude higher than storage rings. The accelerator uses an energy recovered linac design for efficiency of operation. New style superconducting linac cryomodules with higher gradient, combined with a new injector and beam transport system allow the development of the FEL to higher photon energies.

  7. LabVIEW-based control software for para-hydrogen induced polarization instrumentation.

    Science.gov (United States)

    Agraz, Jose; Grunfeld, Alexander; Li, Debiao; Cunningham, Karl; Willey, Cindy; Pozos, Robert; Wagner, Shawn

    2014-04-01

    The elucidation of cell metabolic mechanisms is the modern underpinning of the diagnosis, treatment, and in some cases the prevention of disease. Para-Hydrogen induced polarization (PHIP) enhances magnetic resonance imaging (MRI) signals over 10,000 fold, allowing for the MRI of cell metabolic mechanisms. This signal enhancement is the result of hyperpolarizing endogenous substances used as contrast agents during imaging. PHIP instrumentation hyperpolarizes Carbon-13 ((13)C) based substances using a process requiring control of a number of factors: chemical reaction timing, gas flow, monitoring of a static magnetic field (Bo), radio frequency (RF) irradiation timing, reaction temperature, and gas pressures. Current PHIP instruments manually control the hyperpolarization process resulting in the lack of the precise control of factors listed above, resulting in non-reproducible results. We discuss the design and implementation of a LabVIEW based computer program that automatically and precisely controls the delivery and manipulation of gases and samples, monitoring gas pressures, environmental temperature, and RF sample irradiation. We show that the automated control over the hyperpolarization process results in the hyperpolarization of hydroxyethylpropionate. The implementation of this software provides the fast prototyping of PHIP instrumentation for the evaluation of a myriad of (13)C based endogenous contrast agents used in molecular imaging.

  8. PMMA to SU-8 bonding for polymer based lab-on-a-chip systems with integrated optics

    DEFF Research Database (Denmark)

    Olsen, Brian Bilenberg; Nielsen, Theodor; Clausen, Bjarne Hans

    2004-01-01

    We present an adhesive bonding technique developed for SU-8 based "lab-on-a-chip"- systems with integrated optical components. Microfluidic channels and optical components (e.g. wave-guides) are defined in SU-8 photoresist on a Pyrex glass substrate. The microfluidic channels are sealed by a second...

  9. PMMA to SU-8 Bonding for Polymer Based Lab-on -a-chip Systems with Integrated Optics

    DEFF Research Database (Denmark)

    Clausen, Bjarne

    2003-01-01

    An adhesive bonding technique for wafer-level sealing of SU-8 based lab-on-a-chip microsystems with integrated optical components is presented. Microfluidic channels and optical components, e.g. waveguides, are fabricated in cross-linked SU-8 and sealed with a Pyrex glass substrate by means...

  10. Digital signal processing system design LabVIEW-bases hybrid programming

    CERN Document Server

    Kehtarnavaz, Nasser; Peng, Qingzhong

    2008-01-01

    Reflecting LabView's new MathScripting feature, the new edition of this book combines textual and graphical programming to form a hybrid programming approach, enabling a more effective means of building and analyzing DSP systems. The hybrid programming approach allows the use of previously developed textual programming solutions to be integrated into LabVIEW's highly interactive and visual environment, providing an easier and quicker method for building DSP systems.Features * The only DSP laboratory book that combines both textual and graphical programming * 12 lab experime

  11. PD Lab

    NARCIS (Netherlands)

    Bilow, Marcel; Entrop, Alexis Gerardus; Lichtenberg, Jos; Stoutjesdijk, Pieter

    2015-01-01

    PD Lab explores the applications of building sector related product development. PD lab investigates and tests digital production technologies like CNC milled wood connections. It will also act as a platform in its wider meaning to investigate the effects and influences of file to factory

  12. Determination of pyrethroid pesticides in tomato using ionic liquid-based dispersive liquid-liquid microextraction.

    Science.gov (United States)

    Han, Dandan; Tang, Baokun; Row, Kyung Ho

    2014-03-01

    A sensitive determination method was developed for the analysis of pyrethroid pesticide residues in tomato samples using ionic liquid-based dispersive liquid-liquid microextraction. A hydrophobic ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) and acetonitrile were used as the extraction solvent and dispersive solvent, respectively. The following experimental parameters affecting the extraction efficiency were examined: types of extraction solvent and volume of extraction solvent, types of dispersive solvent and volume of dispersive solvent and pH and ion strength of the sample solution. Under the optimum conditions, the extraction recoveries ranged from 83.9 to 96.7%. Moreover, the enrichment factors for esbiothrin, fenpropathrin and cyhalothrin were 42, 48 and 45, respectively. The calibration curves were linear with correlation coefficients ranging from 0.9997 to 0.9999 at concentrations of 0.05-1.5 µg/kg. The relative standard deviation (n = 5) was 1.7-4.5%. The limits of detection for esbiothrin, fenpropathrin and cyhalothrin were 8.1, 9.9 and 14.3 µg/kg, respectively.

  13. Functional electrical stimulation: a MatLab based tool for designing stimulation patterns.

    Science.gov (United States)

    Dosen, Strahinja; Popović, Dejan B

    2006-01-01

    We developed user-friendly software that generates stimulation profiles by using user-customized model-based control of walking. The model is a multi-segment structure with pin and ball joints. A pair of an agonist and an antagonistic muscles acts at each joint. Each muscle is modeled by a three-compartment multiplicative model. The control is based on optimization that uses a cost function that minimizes the tracking error of the joint angles and levels of muscles activations. The inputs to the simulation are trajectories and user characteristic model parameters. The outputs of the simulation are levels of muscle activations vs. time. The software allows for interactive testing of various walking trajectories and model parameters since the simulation is integrated into a database of individuals and reference trajectories. The simulation was realized in the MatLab environment with multiple windows graphical user interface. Here we present an example: stimulation patterns for the shank-foot system that is applicable for walking control in hemiplegic individuals.

  14. Optical biosensor based on a silicon nanowire ridge waveguide for lab on chip applications

    Science.gov (United States)

    Gamal, Rania; Ismail, Yehea; Swillam, Mohamed A.

    2015-04-01

    We propose a novel sensor using a silicon nanowire ridge waveguide (SNRW). This waveguide is comprised of an array of silicon nanowires on an insulator substrate that has the envelope of a ridge waveguide. The SNRW inherently maximizes the overlap between the material-under-test and the incident light wave by introducing voids to the otherwise bulk structure. When a sensing sample is injected, the voids within the SNRW adopt the refractive index of the material-under-test. Hence, the strong contribution of the material-under-test to the overall modal effective index will greatly augment the sensitivity. Additionally, the ridge structure provides a fabrication convenience as it covers the entire substrate, ensuring that the etching process would not damage the substrate. Finite-difference time-domain simulations are conducted and showed that the percentage change in the effective index due to a 1% change in the surrounding environment is more than 170 times the change perceived in an evanescent-detection based bulk silicon ridge waveguide. Moreover, the SNRW proves to be more sensitive than recent other, non-evanescent sensors. In addition, the detection limit for this structure was revealed to be as small as 10-8. A compact bimodal waveguide based on SNRW is designed and tested. It delivers high sensitivity values that offer comparable performance to similar low-index light-guiding sensing configurations; however, our proposed structure has much smaller footprints and allows high dense integration for lab-on-chip applications.

  15. The comparison of manual and LabVIEW-based fuzzy control on mechanical ventilation.

    Science.gov (United States)

    Guler, Hasan; Ata, Fikret

    2014-09-01

    The aim of this article is to develop a knowledge-based therapy for management of rats with respiratory distress. A mechanical ventilator was designed to achieve this aim. The designed ventilator is called an intelligent mechanical ventilator since fuzzy logic was used to control the pneumatic equipment according to the rat's status. LabVIEW software was used to control all equipments in the ventilator prototype and to monitor respiratory variables in the experiment. The designed ventilator can be controlled both manually and by fuzzy logic. Eight female Wistar-Albino rats were used to test the designed ventilator and to show the effectiveness of fuzzy control over manual control on pressure control ventilation mode. The anesthetized rats were first ventilated for 20 min manually. After that time, they were ventilated for 20 min by fuzzy logic. Student's t-test for p < 0.05 was applied to the measured minimum, maximum and mean peak inspiration pressures to analyze the obtained results. The results show that there is no statistical difference in the rat's lung parameters before and after the experiments. It can be said that the designed ventilator and developed knowledge-based therapy support artificial respiration of living things successfully.

  16. Study on the Engine Electronic Ignition System Based on SCM and LabVIEW

    Directory of Open Access Journals (Sweden)

    Shanzhen Xu

    2013-05-01

    Full Text Available To improve the operating performance of the electronic control ignition system and meet the requirement of the experiment teaching, an electronic control ignition system based on Lab VIEW and micro-controller was developed in this study. The system was composed of the ignition control circuit, signal processing circuits of various sensors and system software, which combined the functions of data acquisition, analysis and control. According to the working principle of the ignition system and working parameters, the cylinder block temperature signal, throttle position signal and power supply voltage signal were used as the correction references for the ignition advance angle. So the processing circuits of the sensors were designed based on the selection of the sensors and analysis their working principle or characteristic. The software of the host computer was visual and easy to control the slave computer, which realized the control for the ignition timing and dwell time. The experiment results indicated that the system developed in this study was reliable and that the data communication between the host computer and the slave computer reached the expected requirement. The research results provided a foundation for the further study and performance optimization.

  17. Optofluidic router based on tunable liquid-liquid mirrors.

    Science.gov (United States)

    Müller, Philipp; Kopp, Daniel; Llobera, Andreu; Zappe, Hans

    2014-02-21

    We present an electrically tunable 1 × 5 optofluidic router for on-chip light routing. The device can redirect light from an optical input channel into five output channels by exploiting total internal reflection (TIR) at a liquid-liquid interface. The liquid-liquid mirrors, demonstrated for the first time, are tuned using integrated electrowetting-on-dielectrics (EWOD) actuators. The router is assembled from two chips fabricated by standard MEMS techniques. Through a combination of microfluidic with micro-optical components on chip, reliable light routing is achieved with switching times of [1.5-3.3] s, efficiencies of coupling into channels of up to 12%, optical cross-talk as low as -24 dB, a required drive voltage of 50 V, and a low power consumption of router could thus lead to novel laboratory measurement systems.

  18. Implementation of gradients of organic solvent in micellar liquid chromatography using DryLab(®): separation of basic compounds in urine samples.

    Science.gov (United States)

    Rodenas-Montano, J; Ortiz-Bolsico, C; Ruiz-Angel, M J; García-Alvarez-Coque, M C

    2014-05-30

    In micellar liquid chromatography (MLC), chromatographic peaks are more evenly distributed compared to conventional reversed-phase liquid chromatography (RPLC). This is the reason that most procedures are implemented using isocratic elution. However, gradient elution may be still useful in MLC to analyse mixtures of compounds within a wide range of polarities, decreasing the analysis time. Also, it benefits the determination of moderately to low polar compounds in physiological fluids performing direct injection: an initial micellar eluent with a low organic solvent content, or a pure micellar (without surfactant) solution, will provide better protection of the column against the proteins in the physiological fluid, and once the proteins are swept away, the elution strength can be increased using a positive linear gradient of organic solvent to reduce the analysis time. This work aims to encourage analysts to implement gradients of organic solvent in MLC, which is rather simple and allows rapid analytical procedures without pre-treatment or the need of re-equilibration. The implementation of gradient elution is illustrated through the separation of eight basic compounds (β-blockers) in urine samples directly injected into the chromatograph, the most hydrophobic showing large retention in both conventional RPLC and MLC. The use of the DryLab(®) software to optimise gradients of organic solvent with eluents containing a fixed amount of surfactant above the critical micellar concentration is shown to provide satisfactory predictions, and can facilitate greatly the implementation of gradient protocols.

  19. Implementation of a research-based lab module in a high school chemistry curriculum: A study of classroom dynamics

    Science.gov (United States)

    Pilarz, Matthew

    For this study, a research-based lab module was implemented in two high school chemistry classes for the purpose of examining classroom dynamics throughout the process of students completing the module. A research-based lab module developed for use in undergraduate laboratories by the Center for Authentic Science Practice in Education (CASPiE) was modified and implemented in two high school settings. This module consisted of four phases: Skill Building, Experimental Design, Independent Research, and Results and Poster Presentation. Classroom dynamics were studied by considering the students' and teachers' perceptions of their experiences during the completion of the module and by examining the interactions between students and teachers that took place throughout the module. The results reveal that there are shifts in classroom dynamics throughout the four phases of the module. In the Skill Building phase there was a great deal of dependence on the teacher for help in completing tasks. However, there is a slight contrast to what the students and teachers reported about their experiences during this phase. The teachers describe the students as being very dependent on them and asking questions constantly during the Skill Building experiments. The students report that they tried to figure out their problems with their lab partners and students in other lab groups before asking the teacher for help. The teachers perceived that students came to them immediately for help and did not realize that students were coming to them as sort of a last resort when they could not solve problems on their own. In the Experimental Design phase the students and teachers both report that the lab groups were working together as groups to design their experiments, and rarely had interactions with anyone outside of their lab group. For the Independent Research phase both students and teachers report that lab groups worked very independently of any outside assistance and that they began to

  20. 基于LabVIEW/Matlab的AUV半实物仿真系统设计%Design of AUV simulation system based on LabVIEW/Matlab

    Institute of Scientific and Technical Information of China (English)

    赵兴; 李健; 李一博

    2014-01-01

    In order to solve the problem of the establishment of actual experimental environment of large AUV(Autono-mous Underwater Vehicle), and for the testing need of different units of AUV control system, a new AUV semi-physical simulation system is designed based on LabVIEW/Matlab under Windows platform. The simulation system realizes the real-time calculation of AUV’s position and posture based on three-dimensional hydrodynamic model; meanwhile, it makes serial port and Ethernet communication with deck system and master control system by imitating Phins, GAPS, fixed high altimeter, obstacle avoidance sonar, and other sensors, which realizes AUV’s motion simulation and also pro-vides evidences for determining motion control strategy. Experimentation shows that the system model is reasonable, and the given software design is feasible. The established simulation system is flexible to be extended or reduced, which is used successfully in testing experiment of AUV’s control system.%为解决大型自主式水下航行器(Autonomous Underwater Vehicle,AUV)实际实验环境搭建的困难,以及AUV控制系统各单元功能测试的需要,设计了一套新的Windows平台下基于LabVIEW/Matlab的AUV半实物仿真系统。该仿真系统基于三维空间的水动力模型,来实时计算AUV的位置和姿态等信息;同时,模仿Phins、GAPS、定高高度计、避障声呐等传感器,和AUV甲板、主控以及运动控制单元进行串行和以太网络通信,实现了AUV的运动仿真,同时也为制定运动控制策略提供相关依据。大量实验表明,该系统模型较合理,软件设计可行,具有灵活的扩展性和伸缩性,在AUV控制系统测试实验中成功应用。

  1. A system of motor imaging brain-computer interface based on LabVIEW%基于LabVIEW运动想象的脑机接口系统

    Institute of Scientific and Technical Information of China (English)

    周雅; 何庆华; 焦晓波

    2011-01-01

    BACKGROUND: The brain-computer interface (BCI) based on event-related potential can be widely used in the rehabilitation ofdisabled patients, showing its importance and the feasibility of future implementation.OBJECTIVE: To present the realization of BCI based on motor imaging under LabVIEW.METHODS: The critical parts of the solution are the realization of the visual stimulation and the feature extraction ofelectroencephalogram (EEG). The testee fixates on playback images of the left and right hand on the screen, which can induceEEG. The band pass filtering is used to improve the signal-to-noise ratio (SNR). The EEG data intercepted with the sliding windowhave been analyzed from the perspective of time-domain energy and obtained the feature extraction of motor imaging E EG.On-line feature extraction lays the foundation for the realization of real-time system.RESULTS AND CONCLUSION: The program can effectively extract the features of motor imagery, and effectively conduct aclassification by off-line pattern recognition, with classification results achieving 82%.%背景:基于事件相关电位的脑-机接口,可广泛应用于残障患者的康复,显示出其重要性和未来实现的可行性.目的:提出基于LabVIEW 环境下的运动想象脑-机接口系统的实现方案.方法:研究的关键部分是视觉刺激器的设计和脑电特征信号的特征提取两部分.测试者通过观察视觉刺激器上的左右手连续播放图像刺激产生脑电信号,采用带通滤波提高信噪比,用滑动窗截取脑电数据并且对截取的数据从能量的角度分析得到运动想象特征,同时可以在线提取特征,为实现实时系统打下了基础.结果与结论:该方案能有效地提取出运动想象特征,并且通过离线模式识别进行了有效的分类,分类效果达到了82%.

  2. 基于LabVIEW的定光栅摄谱仪的实现研究%Development of grating spectrograph based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    雷轶鸣; 陈小娟

    2008-01-01

    为了实现对LED光谱特性参数的自动测量,利用虚拟仪器的设计思想及LabVIEW软件强大的信号处理功能,设计实现了基于LabVIEW的定光栅摄谱仪.系统以LabVIEW为软件平台,定光栅摄谱仪为硬件平台,获取信号通过PC机的控制和处理,实现了自动控制、测量信号、分析、显示等功能.实验表明,基于LabVIEW的定光栅摄谱仪具有界面友好、操作简单、测量精度高等特点,具有广阔的应用前景.

  3. PLC Control Program for Air Conditioning Unit Based on LabVIEW%LabVIEW环境下空调机组PLC控制程序的编制

    Institute of Scientific and Technical Information of China (English)

    冯营伟; 张少军; 刘合良

    2013-01-01

    本文介绍如何运用LabVlEW图形模块化的编程环境并使用PLC对空调机组的运行进行控制,编制基于LabVlEW的梯形图PLC控制程序,实现对空调机组送风温、湿度的控制.

  4. 基于LabVIEW的虚拟示波器仿真实验设计%Simulation Experiment of Oscillograph is Designed Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    戴志超

    2010-01-01

    该文介绍了虚拟仪器的特点与组成,虚拟仪器软件开发工具LabVIEW.进而介绍了基于LabVIEW的虚拟示渡器的设计,并且通过虚拟示渡器完成了两个相关的仿真实验.

  5. LabVIEW Based Remote Virtual Instrument Multiple Thread Technology%基于LabVIEW的远程虚似仪器多线程技术

    Institute of Scientific and Technical Information of China (English)

    林康红

    2003-01-01

    在简要介绍虚拟仪器开发平台LabVIEW的基础上,对多线程技术作了说明.结合具体实例,着重分析了远程虚拟仪器系统中多线程技术的实现方法--LabVIEW多任务并行程序.

  6. Lab-on-a-chip-based high-throughput screening of the genotoxicity of engineered nanomaterials.

    Science.gov (United States)

    Vecchio, Giuseppe; Fenech, Michael; Pompa, Pier Paolo; Voelcker, Nicolas H

    2014-07-09

    The continuous increasing of engineered nanomaterials (ENMs) in our environment, their combinatorial diversity, and the associated genotoxic risks, highlight the urgent need to better define the possible toxicological effects of ENMs. In this context, we present a new high-throughput screening (HTS) platform based on the cytokinesis-block micronucleus (CBMN) assay, lab-on-chip cell sorting, and automated image analysis. This HTS platform has been successfully applied to the evaluation of the cytotoxic and genotoxic effects of silver nanoparticles (AgNPs) and silica nanoparticles (SiO2NPs). In particular, our results demonstrate the high cyto- and genotoxicity induced by AgNPs and the biocompatibility of SiO2NPs, in primary human lymphocytes. Moreover, our data reveal that the toxic effects are also dependent on size, surface coating, and surface charge. Most importantly, our HTS platform shows that AgNP-induced genotoxicity is lymphocyte sub-type dependent and is particularly pronounced in CD2+ and CD4+ cells.

  7. Experimental investigation of fuel regression rate in a HTPB based lab-scale hybrid rocket motor

    Science.gov (United States)

    Li, Xintian; Tian, Hui; Yu, Nanjia; Cai, Guobiao

    2014-12-01

    The fuel regression rate is an important parameter in the design process of the hybrid rocket motor. Additives in the solid fuel may have influences on the fuel regression rate, which will affect the internal ballistics of the motor. A series of firing experiments have been conducted on lab-scale hybrid rocket motors with 98% hydrogen peroxide (H2O2) oxidizer and hydroxyl terminated polybutadiene (HTPB) based fuels in this paper. An innovative fuel regression rate analysis method is established to diminish the errors caused by start and tailing stages in a short time firing test. The effects of the metal Mg, Al, aromatic hydrocarbon anthracene (C14H10), and carbon black (C) on the fuel regression rate are investigated. The fuel regression rate formulas of different fuel components are fitted according to the experiment data. The results indicate that the influence of C14H10 on the fuel regression rate of HTPB is not evident. However, the metal additives in the HTPB fuel can increase the fuel regression rate significantly.

  8. Black hole based quantum computing in labs and in the sky

    Energy Technology Data Exchange (ETDEWEB)

    Dvali, Gia [Arnold Sommerfeld Center for Theoretical Physics, Department fuer Physik, Ludwig-Maximilians-Universitaet Muenchen (Germany); Max-Planck-Institut fuer Physik, Muenchen (Germany); Center for Cosmology and Particle Physics, Department of Physics, New York University, New York, NY (United States); Panchenko, Mischa [Arnold Sommerfeld Center for Theoretical Physics, Department fuer Physik, Ludwig-Maximilians-Universitaet Muenchen (Germany)

    2016-08-15

    Analyzing some well established facts, we give a model-independent parameterization of black hole quantum computing in terms of a set of macro and micro quantities and their relations. These include the relations between the extraordinarily-small energy gap of black hole qubits and important time-scales of information-processing, such as, scrambling time and Page's time. We then show, confirming and extending previous results, that other systems of nature with identical quantum informatics features are attractive Bose-Einstein systems at the critical point of quantum phase transition. Here we establish a complete isomorphy between the quantum computational properties of these two systems. In particular, we show that the quantum hair of a critical condensate is strikingly similar to the quantum hair of a black hole. Irrespectively whether one takes the similarity between the two systems as a remarkable coincidence or as a sign of a deeper underlying connection, the following is evident. Black holes are not unique in their way of quantum information processing and we can manufacture black hole based quantum computers in labs by taking advantage of quantum criticality. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  9. Loss of Flow Accident (LOFA) analyses using LabView-based NRR simulator

    Energy Technology Data Exchange (ETDEWEB)

    Arafa, Amany Abdel Aziz; Saleh, Hassan Ibrahim [Atomic Energy Authority, Cairo (Egypt). Radiation Engineering Dept.; Ashoub, Nagieb [Atomic Energy Authority, Cairo (Egypt). Reactor Physics Dept.

    2016-12-15

    This paper presents a generic Loss of Flow Accident (LOFA) scenario module which is integrated in the LabView-based simulator to imitate a Nuclear Research Reactor (NRR) behavior for different user defined LOFA scenarios. It also provides analyses of a LOFA of a single fuel channel and its impact on operational transactions and on the behavior of the reactor. The generic LOFA scenario module includes graphs needed to clarify the effects of the LOFA under study. Furthermore, the percentage of the loss of mass flow rate, the mode of flow reduction and the start time and transient time of LOFA are user defined to add flexibility to the LOFA scenarios. The objective of integrating such generic LOFA module is to be able to deal with such incidents and avoid their significant effects. It is also useful in the development of expertise in this area and reducing the operator training and simulations costs. The results of the implemented generic LOFA module agree well with that of COBRA-IIIC code and the earlier guidebook for this series of transients.

  10. Laser Research Lab

    Data.gov (United States)

    Federal Laboratory Consortium — The Laser Research lab is thecenter for the development of new laser sources, nonlinear optical materials, frequency conversion processes and laser-based sensors for...

  11. Design of network experimental platform based on LabVIEW%基于 LabVIEW 的网络实验平台设计

    Institute of Scientific and Technical Information of China (English)

    康守强; 王玉静; 王鹏; 宋立新; 刘芬

    2016-01-01

    应用模块化的设计思想,对基于虚拟技术的网络实验平台进行设计。从实验仪器、通信原理课程实验、信号处理课程实验三方面着手开发,使学生能够在一个平台上进行多种实验,同时 LabVIEW 的程序框图面板使学生能够更清楚地了解实验的处理过程。该网络实验平台的开发节省了空间和高昂的仪器费用,并且网络共享能够实现远程操作和资源共享,打破了时间和空间的局限,有助于培养自主学习能力,提高学习和工作效率,为师生带来诸多便利。%The design of the network experimental platform based on the virtual technology uses the modular design concept.It is to develop from the following three aspects:the laboratory instruments,the experiment of Principles of Communication course,and the experiment of Signal Processing course,which can make the students carry out a variety of experiments on the same platform,besides,the block diagram panel of LabVIEW can also make the students understand the process of the experiment more clearly.Compared to traditional laboratory,the development of network experiment platform saves space and the high equipment costs,and network sharing enables to realize the remote operation and resource sharing, breaking the limitations of time and space,helping to develop self-learning ability and improve learning and work efficiency, bringing a lot of convenience for teachers and students.

  12. Development of new Polysiloxane Based Liquid Scintillators

    Energy Technology Data Exchange (ETDEWEB)

    Dalla Palma, M.; Quaranta, A. [Department of Industrial Engineering, University of Trento,Via Sommarive, 9, 38123 Trento (Italy); INFN, Laboratori Nazionali di Legnaro,Viale dell' Universita, 2, 35020 Legnaro - Padova (Italy); Gramegna, F.; Marchi, T.; Cinausero, M. [INFN, Laboratori Nazionali di Legnaro,Viale dell' Universita, 2, 35020 Legnaro - Padova (Italy); Carturan, S.; Collazuol, G.; Checchia, C. [INFN, Laboratori Nazionali di Legnaro,Viale dell' Universita, 2, 35020 Legnaro - Padova (Italy); Department of Physics and Astronomy, University of Padova, Via Marzolo, 8, 35131 Padova (Italy); Degerlier, M. [Department of Physics, Nevsehir Haci Bektas Veli University, Science and Art Faculty, 50300 Nevsehir (Turkey)

    2015-07-01

    In the last decade, attention toward neutron detection has been growing in the scientific community, driven by new requirements in different fields of application ranging from homeland security to medical and material analysis, from research physics, to nuclear energy production. So far neutron detection, with particular attention to fast neutrons, has been mainly based on organic liquid scintillators, owing to their good efficiency and pulse shape discrimination (PSD) capability. Most of these liquids have however some main drawbacks given by toxicity, flammability, volatility and sensitivity to dissolved oxygen that limits the duration and the quality of their performances with worse handiness and increased costs. Phenyl-substituted polysiloxanes could address most of these issues, being characterized by low toxicity, low volatility and low flammability. Their optical properties can be tailored by changing the phenyl distribution and concentration thus allowing to increase the solubility of organic dyes, to modify the fluorescence spectra and to vary the refractive index of the medium. Furthermore, polysiloxanes have been recently exploited for the production of plastic scintillators with very good chemical and thermal stability and very good radiation hardness and the development of polysiloxane liquid scintillators could allow to combine these interesting properties with the supremacy of liquid scintillators as regarding PSD over plastics. For these reasons, the properties of several phenyl-substituted polysiloxane with different phenyl amounts and different viscosities have been investigated, with particular attention to the scintillation response and the pulse shape discrimination capability, and the results of the investigation are reported in this work. More in details, the scintillation light yield towards gamma rays ({sup 60}Co and {sup 137}Cs) of several polysiloxane liquids has been analyzed and compared with the light yield of a commercial non

  13. PD Lab

    OpenAIRE

    Bilow, Marcel; Entrop, Bram; Lichtenberg, Jos; Stoutjesdijk, Pieter

    2015-01-01

    PD Lab explores the applications of building sector related product development. PD lab investigates and tests digital production technologies like CNC milled wood connections. It will also act as a platform in its wider meaning to investigate the effects and influences of file to factory production, to explore the potential in the field of sustainability, material use, logistics and the interaction of stakeholders within the chain of the building process.

  14. Electromagnetic liquid pistons for capillarity-based pumping.

    Science.gov (United States)

    Malouin, Bernard A; Vogel, Michael J; Olles, Joseph D; Cheng, Lili; Hirsa, Amir H

    2011-02-07

    The small scales associated with lab-on-a-chip technologies lend themselves well to capillarity-dominated phenomena. We demonstrate a new capillarity-dominated system where two adjoining ferrofluid droplets can behave as an electronically-controlled oscillator or switch by an appropriate balance of magnetic, capillary, and inertial forces. Their oscillatory motion can be exploited to displace a surrounding liquid (akin to an axial piston pump), forming electromagnetic "liquid pistons." Such ferrofluid pistons can pump a precise volume of liquid via finely tunable amplitudes (cf. pump stroke) or resonant frequencies (cf. pump speed) with no solid moving parts for long-term operation without wear in a small device. Furthermore, the rapid propagation of electromagnetic fields and the favorable scaling of capillary forces with size permit micron sized devices with very fast operating speeds (∼kHz). The pumping dynamics and performance of these liquid pistons is explored, with experimental measurements showing good agreement with a spherical cap model. While these liquid pistons may find numerous applications in micro- and mesoscale fluidic devices (e.g., remotely activated drug delivery), here we demonstrate the use of these liquid pistons in capillarity-dominated systems for chip-level, fast-acting adaptive liquid lenses with nearly perfect spherical interfaces.

  15. Protein functionalized carbon nanotubes-based smart lab-on-a-chip.

    Science.gov (United States)

    Ali, Md Azahar; Solanki, Pratima R; Srivastava, Saurabh; Singh, Samer; Agrawal, Ved V; John, Renu; Malhotra, Bansi D

    2015-03-18

    A label-free impedimetric lab on a chip (iLOC) is fabricated using protein (bovine serum albumin) and antiapolipoprotein B functionalized carbon nanotubes-nickel oxide (CNT-NiO) nanocomposite for low-density lipoprotein (LDL) detection. The antiapolipoprotein B (AAB) functionalized CNT-NiO microfluidic electrode is assembled with polydimethylsiloxane rectangular microchannels (cross section: 100 × 100 μm). Cytotoxicity of the synthesized CNTs, NiO nanoparticles, and CNT-NiO nanocomposite has been investigated in the presence of lung epithelial cancer A549 cell line using MTT assay. The CNT-NiO nanocomposite shows higher cell viability at a concentration of 6.5 μg/mL compared to those using individual CNTs. The cell viability and proliferation studies reveal that the toxicity increases with increasing CNTs concentration. The X-ray photoelectron spectroscopy studies have been used to quantify the functional groups present on the CNT-NiO electrode surface before and after proteins functionalization. The binding kinetic and electrochemical activities of CNT-NiO based iLOC have been conducted using chronocoulometry and impedance spectroscopic techniques. This iLOC shows excellent sensitivity of 5.37 kΩ (mg/dL)(-1) and a low detection limit of 0.63 mg/dL in a wide concentration range (5-120 mg/dL) of LDL. The binding kinetics of antigen-antibody interaction of LDL molecules reveal a high association rate constant (8.13 M(-1) s(-1)). Thus, this smart nanocomposite (CNT-NiO) based iLOC has improved stability and reproducibility and has implications toward in vivo diagnostics.

  16. Lab on a chip genotyping for Brucella spp. based on 15-loci multi locus VNTR analysis

    Directory of Open Access Journals (Sweden)

    Marianelli Cinzia

    2009-04-01

    Full Text Available Abstract Background Brucellosis is an important zoonosis caused by the genus Brucella. In addition Brucella represents potential biological warfare agents due to the high contagious rates for humans and animals. Therefore, the strain typing epidemiological tool may be crucial for tracing back source of infection in outbreaks and discriminating naturally occurring outbreaks versus bioterroristic event. A Multiple Locus Variable-number tandem repeats (VNTR Analysis (MLVA assay based on 15 polymorphic markers was previously described. The obtained MLVA band profiles may be resolved by techniques ranging from low cost manual agarose gels to the more expensive capillary electrophoresis sequencing. In this paper a rapid, accurate and reproducible system, based on the Lab on a chip technology was set up for Brucella spp. genotyping. Results Seventeen DNA samples of Brucella strains isolated in Sicily, previously genotyped, and twelve DNA samples, provided by MLVA Brucella VNTR ring trial, were analyzed by MLVA-15 on Agilent 2100. The DNA fragment sizes produced by Agilent, compared with those expected, showed discrepancies; therefore, in order to assign the correct alleles to the Agilent DNA fragment sizes, a conversion table was produced. In order to validate the system twelve unknown DNA samples were analyzed by this method obtaining a full concordance with the VNTR ring trial results. Conclusion In this paper we described a rapid and specific detection method for the characterization of Brucella isolates. The comparison of the MLVA typing data produced by Agilent system with the data obtained by standard sequencing or ethidium bromide slab gel electrophoresis showed a general concordance of the results. Therefore this platform represents a fair compromise among costs, speed and specificity compared to any conventional molecular typing technique.

  17. Fuzzy logic type 1 and type 2 based on LabVIEW FPGA

    CERN Document Server

    Ponce-Cruz, Pedro; MacCleery, Brian

    2016-01-01

    This book is a comprehensive introduction to LabVIEW FPGA™, a package allowing the programming of intelligent digital controllers in field programmable gate arrays (FPGAs) using graphical code. It shows how both potential difficulties with understanding and programming in VHDL and the consequent difficulty and slowness of implementation can be sidestepped. The text includes a clear theoretical explanation of fuzzy logic (type 1 and type 2) with case studies that implement the theory and systematically demonstrate the implementation process. It goes on to describe basic and advanced levels of programming LabVIEW FPGA and show how implementation of fuzzy-logic control in FPGAs improves system responses. A complete toolkit for implementing fuzzy controllers in LabVIEW FPGA has been developed with the book so that readers can generate new fuzzy controllers and deploy them immediately. Problems and their solutions allow readers to practice the techniques and to absorb the theoretical ideas as they arise. Fuzzy L...

  18. 基于LabVIEW的状态机模型研究%Research on State Machine Model Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    聂影; 冯向军; 廖瑛; 李磊

    2007-01-01

    LabVIEW采用图形化编程语言(G语言),与传统的文本编程语言有显著的区别,很多在文本语言上比较成熟的架构模式却不适用于LabVIEW;通过引入状态机的基本原理,归纳总结状态机在LabVIEW中的实现方法,以及对总装维修项目"便携式舰载导弹舰面测试监控系统"的编程实践,证明了状态机是一种适用于LabVIEW的架构模式;采用状态机模型编写的LabVIEW程序,具有很好的可读性、扩展性、维护性和代码重用性.

  19. LabVIEW and PCI DAQ Card Based HTS Test and Control Platforms

    Institute of Scientific and Technical Information of China (English)

    Hui-Bin Zhao; Jian-Xun Jin; Pu-Chun Jiang; Wen-Hui Gao; Zi-Lu Liang

    2008-01-01

    This paper introduces the relevant parameters and related characteristics of the LabVIEW and PCI6221 data acquisition (DAQ) card, describes in detail the approach of building the measure and control platform of virtual instrument (VI) using LabVIEW and PCI6221, specifically discusses the system's application in high temperature superconductor (HTS) research including the test of HTS volt-ampere characteristics and the HTS magnetic energy storage. The experiments prove that the VI test and control system is easy to build and convenient to use.

  20. A Lab Assembled Microcontroller-Based Sensor Module for Continuous Oxygen Measurement in Portable Hypoxia Chambers.

    Directory of Open Access Journals (Sweden)

    Saroj P Mathupala

    Full Text Available Hypoxia-based cell culture experiments are routine and essential components of in vitro cancer research. Most laboratories use low-cost portable modular chambers to achieve hypoxic conditions for cell cultures, where the sealed chambers are purged with a gas mixture of preset O2 concentration. Studies are conducted under the assumption that hypoxia remains unaltered throughout the 48 to 72 hour duration of such experiments. Since these chambers lack any sensor or detection system to monitor gas-phase O2, the cell-based data tend to be non-uniform due to the ad hoc nature of the experimental setup.With the availability of low-cost open-source microcontroller-based electronic project kits, it is now possible for researchers to program these with easy-to-use software, link them to sensors, and place them in basic scientific apparatus to monitor and record experimental parameters. We report here the design and construction of a small-footprint kit for continuous measurement and recording of O2 concentration in modular hypoxia chambers. The low-cost assembly (US$135 consists of an Arduino-based microcontroller, data-logging freeware, and a factory pre-calibrated miniature O2 sensor. A small, intuitive software program was written by the authors to control the data input and output. The basic nature of the kit will enable any student in biology with minimal experience in hobby-electronics to assemble the system and edit the program parameters to suit individual experimental conditions.We show the kit's utility and stability of data output via a series of hypoxia experiments. The studies also demonstrated the critical need to monitor and adjust gas-phase O2 concentration during hypoxia-based experiments to prevent experimental errors or failure due to partial loss of hypoxia. Thus, incorporating the sensor-microcontroller module to a portable hypoxia chamber provides a researcher a capability that was previously available only to labs with access to

  1. A Lab Assembled Microcontroller-Based Sensor Module for Continuous Oxygen Measurement in Portable Hypoxia Chambers.

    Science.gov (United States)

    Mathupala, Saroj P; Kiousis, Sam; Szerlip, Nicholas J

    2016-01-01

    Hypoxia-based cell culture experiments are routine and essential components of in vitro cancer research. Most laboratories use low-cost portable modular chambers to achieve hypoxic conditions for cell cultures, where the sealed chambers are purged with a gas mixture of preset O2 concentration. Studies are conducted under the assumption that hypoxia remains unaltered throughout the 48 to 72 hour duration of such experiments. Since these chambers lack any sensor or detection system to monitor gas-phase O2, the cell-based data tend to be non-uniform due to the ad hoc nature of the experimental setup. With the availability of low-cost open-source microcontroller-based electronic project kits, it is now possible for researchers to program these with easy-to-use software, link them to sensors, and place them in basic scientific apparatus to monitor and record experimental parameters. We report here the design and construction of a small-footprint kit for continuous measurement and recording of O2 concentration in modular hypoxia chambers. The low-cost assembly (US$135) consists of an Arduino-based microcontroller, data-logging freeware, and a factory pre-calibrated miniature O2 sensor. A small, intuitive software program was written by the authors to control the data input and output. The basic nature of the kit will enable any student in biology with minimal experience in hobby-electronics to assemble the system and edit the program parameters to suit individual experimental conditions. We show the kit's utility and stability of data output via a series of hypoxia experiments. The studies also demonstrated the critical need to monitor and adjust gas-phase O2 concentration during hypoxia-based experiments to prevent experimental errors or failure due to partial loss of hypoxia. Thus, incorporating the sensor-microcontroller module to a portable hypoxia chamber provides a researcher a capability that was previously available only to labs with access to sophisticated (and

  2. A LabVIEW(®)-based software for the control of the AUTORAD platform: a fully automated multisequential flow injection analysis Lab-on-Valve (MSFIA-LOV) system for radiochemical analysis.

    Science.gov (United States)

    Barbesi, Donato; Vicente Vilas, Víctor; Millet, Sylvain; Sandow, Miguel; Colle, Jean-Yves; Aldave de Las Heras, Laura

    2017-01-01

    A LabVIEW(®)-based software for the control of the fully automated multi-sequential flow injection analysis Lab-on-Valve (MSFIA-LOV) platform AutoRAD performing radiochemical analysis is described. The analytical platform interfaces an Arduino(®)-based device triggering multiple detectors providing a flexible and fit for purpose choice of detection systems. The different analytical devices are interfaced to the PC running LabVIEW(®)VI software using USB and RS232 interfaces, both for sending commands and receiving confirmation or error responses. The AUTORAD platform has been successfully applied for the chemical separation and determination of Sr, an important fission product pertinent to nuclear waste.

  3. 基于LabVIEW高频焊管温度采集系统%High-frequency Welded Pipe Temperature Acquisition System Based on LabView

    Institute of Scientific and Technical Information of China (English)

    何世权; 徐德怀; 石玗; 樊丁; 徐德茹; 林建

    2010-01-01

    介绍了基于LabVIEW高频焊管温度采集系统,该系统采用LabVIEW图形化编程开发平台, 利用LabVIEW编写串口程序,对比色测温仪测得的高频焊管的温度信号进行采集.将该系统应用到高频焊管的生产实践中,可以实时采集温度信号,对温度信号进行检测.最后提出了影响高频焊管温度采集系统的因素.

  4. Experiences of citizen-based reporting of rainfall events using lab-generated videos

    Science.gov (United States)

    Alfonso, Leonardo; Chacon, Juan

    2016-04-01

    Hydrologic studies rely on the availability of good-quality precipitation estimates. However, in remote areas of the world and particularly in developing countries, ground-based measurement networks are either sparse or nonexistent. This creates difficulties in the estimation of precipitation, which limits the development of hydrologic forecasting and early warning systems for these regions. The EC-FP7 WeSenseIt project aims at exploring the involvement of citizens in the observation of the water cycle with innovative sensor technologies, including mobile telephony. In particular, the project explores the use of a smartphone applications to facilitate the reporting water-related situations. Apart from the challenge of using such information for scientific purposes, the citizen engagement is one of the most important issues to address. To this end effortless methods for reporting need to be developed in order to involve as many people as possible in these experiments. A potential solution to overcome these drawbacks, consisting on lab-controlled rainfall videos have been produced to help mapping the extent and distribution of rainfall fields with minimum effort [1]. In addition, the quality of the collected rainfall information has also been studied [2] by means of different experiments with students. The present research shows the latest results of the application of this method and evaluates the experiences in some cases. [1] Alfonso, L., J. Chacón, and G. Peña-Castellanos (2015), Allowing Citizens to Effortlessly Become Rainfall Sensors, in 36th IAHR World Congress edited, The Hague, the Netherlands [2] Cortes-Arevalo, J., J. Chacón, L. Alfonso, and T. Bogaard (2015), Evaluating data quality collected by using a video rating scale to estimate and report rainfall intensity, in 36th IAHR World Congress edited, The Hague, the Netherlands

  5. [Realization of Heart Sound Envelope Extraction Implemented on LabVIEW Based on Hilbert-Huang Transform].

    Science.gov (United States)

    Tan, Zhixiang; Zhang, Yi; Zeng, Deping; Wang, Hua

    2015-04-01

    We proposed a research of a heart sound envelope extraction system in this paper. The system was implemented on LabVIEW based on the Hilbert-Huang transform (HHT). We firstly used the sound card to collect the heart sound, and then implemented the complete system program of signal acquisition, pretreatment and envelope extraction on LabVIEW based on the theory of HHT. Finally, we used a case to prove that the system could collect heart sound, preprocess and extract the envelope easily. The system was better to retain and show the characteristics of heart sound envelope, and its program and methods were important to other researches, such as those on the vibration and voice, etc.

  6. Miniaturized preconcentration methods based on liquid-liquid extraction and their application in inorganic ultratrace analysis and speciation: A review

    Science.gov (United States)

    Pena-Pereira, Francisco; Lavilla, Isela; Bendicho, Carlos

    2009-01-01

    Liquid-liquid extraction (LLE) is widely used as a pre-treatment technique for separation and preconcentration of both organic and inorganic analytes from aqueous samples. Nevertheless, it has several drawbacks, such as emulsion formation or the use of large volumes of solvents, which makes LLE expensive and labour intensive. Therefore, miniaturization of conventional liquid-liquid extraction is needed. The search for alternatives to the conventional LLE using negligible volumes of extractant and the minimum number of steps has driven the development of three new miniaturized methodologies, i.e. single-drop microextraction (SDME), hollow fibre liquid-phase microextraction (HF-LPME) and dispersive liquid-liquid microextraction (DLLME). The aim of this paper is to provide an overview of these novel preconcentration approaches and their potential use in analytical labs involved in inorganic (ultra)trace analysis and speciation. Relevant applications to the determination of metal ions, metalloids, organometals and non-metals are included.

  7. Miniaturized preconcentration methods based on liquid-liquid extraction and their application in inorganic ultratrace analysis and speciation: A review

    Energy Technology Data Exchange (ETDEWEB)

    Pena-Pereira, Francisco; Lavilla, Isela [Departamento de Quimica Analitica y Alimentaria, Area de Quimica Analitica, Facultad de Quimica, Universidad de Vigo, Campus As Lagoas-Marcosende s/n, 36310 Vigo (Spain); Bendicho, Carlos [Departamento de Quimica Analitica y Alimentaria, Area de Quimica Analitica, Facultad de Quimica, Universidad de Vigo, Campus As Lagoas-Marcosende s/n, 36310 Vigo (Spain)], E-mail: bendicho@uvigo.es

    2009-01-15

    Liquid-liquid extraction (LLE) is widely used as a pre-treatment technique for separation and preconcentration of both organic and inorganic analytes from aqueous samples. Nevertheless, it has several drawbacks, such as emulsion formation or the use of large volumes of solvents, which makes LLE expensive and labour intensive. Therefore, miniaturization of conventional liquid-liquid extraction is needed. The search for alternatives to the conventional LLE using negligible volumes of extractant and the minimum number of steps has driven the development of three new miniaturized methodologies, i.e. single-drop microextraction (SDME), hollow fibre liquid-phase microextraction (HF-LPME) and dispersive liquid-liquid microextraction (DLLME). The aim of this paper is to provide an overview of these novel preconcentration approaches and their potential use in analytical labs involved in inorganic (ultra)trace analysis and speciation. Relevant applications to the determination of metal ions, metalloids, organometals and non-metals are included.

  8. Two dimensional, electronic particle tracking in liquids with a graphene-based magnetic sensor array

    Science.gov (United States)

    Neumann, Rodrigo F.; Engel, Michael; Steiner, Mathias

    2016-07-01

    The investigation and control of liquid flow at the nanometer scale is a key area of applied research with high relevance to physics, chemistry, and biology. We introduce a method and a device that allows the spatial resolution of liquid flow by integrating an array of graphene-based magnetic (Hall) sensors that is used for tracking the movement of magnetic nanoparticles immersed in a liquid under investigation. With a novel device concept based on standard integration processes and experimentally verified material parameters, we numerically simulate the performance of a single sensor pixel, as well as the whole sensor array, for tracking magnetic nanoparticles having typical properties. The results demonstrate that the device enables (a) the detection of individual nanoparticles in the liquid with high accuracy and (b) the reconstruction of a particle's flow-driven trajectory across the integrated sensor array with sub-pixel precision as a function of time, in what we call the ``Magnetic nanoparticle velocimetry'' technique. Since the method does not rely on optical detection, potential lab-on-chip applications include particle tracking and flow analysis in opaque media at the sub-micron scale.The investigation and control of liquid flow at the nanometer scale is a key area of applied research with high relevance to physics, chemistry, and biology. We introduce a method and a device that allows the spatial resolution of liquid flow by integrating an array of graphene-based magnetic (Hall) sensors that is used for tracking the movement of magnetic nanoparticles immersed in a liquid under investigation. With a novel device concept based on standard integration processes and experimentally verified material parameters, we numerically simulate the performance of a single sensor pixel, as well as the whole sensor array, for tracking magnetic nanoparticles having typical properties. The results demonstrate that the device enables (a) the detection of individual

  9. Detecting System of Auto Oxygen Sensor Based on LabVIEW%基于LabVIEW的氧传感器的测试系统

    Institute of Scientific and Technical Information of China (English)

    王晓光; 潘明

    2009-01-01

    为检测车用氧传感器性能参数,基于LabVIEW语言编写了数据采集程序、与LabVIEW和NiosⅡ接口程序,采用NiosⅡ进行数据采集,通过RS-232串口发送数据,对氧传感器电压信号、内阻及响应时间检测方法.结果表明该系统能可靠地对氧传感器进行参数进行检测.

  10. 基于LabVIEW的远程监控系统设计%The Design Of LabVIEW-based Remote Monitoring System

    Institute of Scientific and Technical Information of China (English)

    邵晓娟

    2013-01-01

    Using the Lab VIEW software that realized important Treasury of temperature and humidity systems remote monitoring,And analyzed and discussed the system of some key technologies such as data acquisition,cal subsystem and remote parameter settings.%  本文主要利用LabVIEW软件对重要库房的温湿度系统实现远程化监控,对于远程实现中的一些关键技术如数据采集、调用子系统及远程参数设置等进行分析讨论。

  11. The Design of a Chemical Virtual Instrument Based on LabVIEW for Determining Temperatures and Pressures.

    Science.gov (United States)

    Wang, Wen-Bin; Li, Jang-Yuan; Wu, Qi-Jun

    2007-01-01

    A LabVIEW-based self-constructed chemical virtual instrument (VI) has been developed for determining temperatures and pressures. It can be put together easily and quickly by selecting hardware modules, such as the PCI-DAQ card or serial port method, different kinds of sensors, signal-conditioning circuits or finished chemical instruments, and software modules such as data acquisition, saving, proceeding. The VI system provides individual and extremely flexible solutions for automatic measurements in physical chemistry research.

  12. Arduino-Based Data Acquisition into Excel, LabVIEW, and MATLAB

    Science.gov (United States)

    Nichols, Daniel

    2017-01-01

    Data acquisition equipment for physics can be quite expensive. As an alternative, data can be acquired using a low-cost Arduino microcontroller. The Arduino has been used in physics labs where the data are acquired using the Arduino software. The Arduino software, however, does not contain a suite of tools for data fitting and analysis. The data…

  13. Validation of a fully autonomous phosphate analyser based on a microfluidic lab-on-a-chip

    DEFF Research Database (Denmark)

    Slater, Conor; Cleary, J.; Lau, K.T.

    2010-01-01

    This work describes the design of a phosphate analyser that utilises a microfluidic lab-on-a-chip. The analyser contains all the required chemical storage, pumping and electronic components to carry out a complete phosphate assay. The system is self-calibrating and self-cleaning, thus capable...

  14. Of Mice and Meth: A New Media-Based Neuropsychopharmacology Lab to Teach Research Methods

    Science.gov (United States)

    Hatch, Daniel L.; Zschau, Tony; Hays, Arthur; McAllister, Kristin; Harrison, Michelle; Cate, Kelly L.; Shanks, Ryan A.; Lloyd, Steven A.

    2014-01-01

    This article describes an innovative neuropsychopharmacology laboratory that can be incorporated into any research methods class. The lab consists of a set of interconnected modules centered on observations of methamphetamine-induced behavioral changes in mice and is designed to provide students with an opportunity to acquire basic skills…

  15. "OpenLAB": A 2-Hour PCR-Based Practical for High School Students

    Science.gov (United States)

    Bouakaze, Caroline; Eschbach, Judith; Fouquerel, Elise; Gasser, Isabelle; Kieffer, Emmanuelle; Krieger, Sophie; Milosevic, Sara; Saandi, Thoueiba; Florentz, Catherine; Marechal-Drouard, Laurence; Labouesse, Michel

    2010-01-01

    The Strasbourg University PhD school in Life and Health Sciences launched an initiative called "OpenLAB." This project was developed in an effort to help high school teenagers understand theoretical and abstract concepts in genetics. A second objective of this program is to help students in defining their future orientation and to…

  16. Towards an Online Lab Portal for Inquiry-Based STEM Learning at School

    NARCIS (Netherlands)

    Govaerts, Sten; Cao, Yiwei; Vozniuk, Andrii; Holzer, Adrian; Zutin, Danilo Garbi; San Cristobal Ruiz, Elio; Bollen, Lars; Manske, Sven; Faltin, Nils; Salzmann, Christophe; Wang, Jhing-Fa; Rynson, Lau

    2013-01-01

    Nowadays, the knowledge economy is growing rapidly. To sustain future growth, more well educated people in STEM (science, technology, engineering and mathematics) are needed. In the Go-Lab project we aim to motivate and orient students from an early age on to study STEM fields in their future educat

  17. The Study on Virtual Medical Instrument based on LabVIEW.

    Science.gov (United States)

    Chengwei, Li; Limei, Zhang; Xiaoming, Hu

    2005-01-01

    With the increasing performance of computer, the virtual instrument technology has greatly advanced over the years, and then virtual medical instrument technology becomes available. This paper presents the virtual medical instrument, and then as an example, an application of a signal acquisition, processing and analysis system using LabVIEW is also given.

  18. "OpenLAB": A 2-Hour PCR-Based Practical for High School Students

    Science.gov (United States)

    Bouakaze, Caroline; Eschbach, Judith; Fouquerel, Elise; Gasser, Isabelle; Kieffer, Emmanuelle; Krieger, Sophie; Milosevic, Sara; Saandi, Thoueiba; Florentz, Catherine; Marechal-Drouard, Laurence; Labouesse, Michel

    2010-01-01

    The Strasbourg University PhD school in Life and Health Sciences launched an initiative called "OpenLAB." This project was developed in an effort to help high school teenagers understand theoretical and abstract concepts in genetics. A second objective of this program is to help students in defining their future orientation and to attract them to…

  19. SU-8 as a material for lab-on-a-chip-based mass spectrometry.

    Science.gov (United States)

    Arscott, Steve

    2014-10-07

    This short review focuses on the application of SU-8 for the microchip-based approach to the miniaturization of mass spectrometry. Chip-based mass spectrometry will make the technology commonplace and bring benefits such as lower costs and autonomy. The chip-based miniaturization of mass spectrometry necessitates the use of new materials which are compatible with top-down fabrication involving both planar and non-planar processes. In this context, SU-8 is a very versatile epoxy-based, negative tone resist which is sensitive to ultraviolet radiation, X-rays and electron beam exposure. It has a very wide thickness range, from nanometres to millimetres, enabling the formation of mechanically rigid, very high aspect ratio, vertical, narrow width structures required to form microfluidic slots and channels for laboratory-on-a-chip design. It is also relatively chemically resistant and biologically compatible in terms of the liquid solutions used for mass spectrometry. This review looks at the impact and potential of SU-8 on the different parts of chip-based mass spectrometry - pre-treatment, ionization processes, and ion sorting and detection.

  20. DAQ System Based on LabVIEW and DSP Serial Port%基于LabVIEW与DSP串口的数据采集系统

    Institute of Scientific and Technical Information of China (English)

    杨笑鹤; 杨昊; 黄惟公

    2004-01-01

    利用DSP(Digital Signal Processor)采集数据,LabVIEW作为开发平台,二者之间通过串口实现数据通讯,开发了一套经济实用的数据采集系统,并详细介绍了软、硬件设计方案.

  1. Design of Virtual EEG Experimental Instrument Based on LabVIEW%基于LabVIEW的虚拟脑电实验仪设计

    Institute of Scientific and Technical Information of China (English)

    付静; 高莉

    2011-01-01

    Aiming at the characteristics of curriculum of biomedical engineering and functions of LabVIEW software, this paper proposed the application of LabVIEW in biomedical engineering teaching by combining hardware with virtual experiments. A virtual EEG experimental instrument was designed. Firstly, EEG signal is magnified and filtered via weak signal processing box, and then virtual instrument is used to achieve the acquisition, storage, display and frequency domain analysis of EEG signal.%利用LabVIEW软件的功能,采用硬件实验和虚拟实验相结合的形式,将LabVIEW应用于生物医学实验教学中.设计了虚拟脑电实验仪,首先通过微弱信号处理实验箱对脑电信号放大滤波,然后利用虚拟仪器技术实现脑电信号的采集、存储、显示和频域分析.

  2. Selective functionalisation of PDMS-based photonic lab on a chip for biosensing.

    Science.gov (United States)

    Ibarlucea, Bergoi; Fernández-Sánchez, César; Demming, Stefanie; Büttgenbach, Stephanus; Llobera, Andreu

    2011-09-07

    A comparative study of different approaches for the selective immobilisation of biomolecules on the surface of poly(dimethylsiloxane) (PDMS) is reported. The motivation of this work is to set a robust and reliable protocol for the easy implementation of a biosensor device in a PDMS-based photonic lab-on-a-chip (PhLoC). A hollow prism configuration, previously reported for the colorimetric detection of analytes was chosen for this study. Here, the inner walls of the hollow prism were initially modified by direct adsorption of either polyethylene glycol (PEG) or polyvinyl alcohol (PVA) linear polymers as well as by carrying out a light chemical oxidation step. All these processes introduced hydroxyl groups on the PDMS surface to a different extent. The hydroxyl groups were further silanised using a silane containing an aldehyde end-group. The interaction between this group and a primary amine moiety enabled the selective covalent attachment of a biomolecule on the PDMS surface. A thorough structural characterisation of the resulting modified-PDMS substrates was carried out by contact angle measurements, X-ray photoelectron spectroscopic (XPS) analysis and atomic force microscopy (AFM) imaging. Using horseradish peroxidase as a model recognition element, different biosensor approaches based on each modification process were developed for the detection of hydrogen peroxide target analyte in a concentration range from 0.1 µM to 100 µM. The analytical performance was similar in all cases, a linear concentration range between 0.1 µM and 24.2 µM, a sensitivity of 0.02 a.u. µM(-1) and a limit of detection around 0.1 µM were achieved. However, important differences were observed in the reproducibility of the devices as well as in their operational stability, which was studied over a period of up to two months. Considering all these studies, the PVA-modified approach appeared to be the most suitable one for the simple fabrication of a biosensor device integrated in a

  3. Teaching and implementing autonomous robotic lab walkthroughs in a biotech laboratory through model-based visual tracking

    Science.gov (United States)

    Wojtczyk, Martin; Panin, Giorgio; Röder, Thorsten; Lenz, Claus; Nair, Suraj; Heidemann, Rüdiger; Goudar, Chetan; Knoll, Alois

    2010-01-01

    After utilizing robots for more than 30 years for classic industrial automation applications, service robots form a constantly increasing market, although the big breakthrough is still awaited. Our approach to service robots was driven by the idea of supporting lab personnel in a biotechnology laboratory. After initial development in Germany, a mobile robot platform extended with an industrial manipulator and the necessary sensors for indoor localization and object manipulation, has been shipped to Bayer HealthCare in Berkeley, CA, USA, a global player in the sector of biopharmaceutical products, located in the San Francisco bay area. The determined goal of the mobile manipulator is to support the off-shift staff to carry out completely autonomous or guided, remote controlled lab walkthroughs, which we implement utilizing a recent development of our computer vision group: OpenTL - an integrated framework for model-based visual tracking.

  4. A text input system developed by using lips image recognition based LabVIEW for the seriously disabled.

    Science.gov (United States)

    Chen, S C; Shao, C L; Liang, C K; Lin, S W; Huang, T H; Hsieh, M C; Yang, C H; Luo, C H; Wuo, C M

    2004-01-01

    In this paper, we present a text input system for the seriously disabled by using lips image recognition based on LabVIEW. This system can be divided into the software subsystem and the hardware subsystem. In the software subsystem, we adopted the technique of image processing to recognize the status of mouth-opened or mouth-closed depending the relative distance between the upper lip and the lower lip. In the hardware subsystem, parallel port built in PC is used to transmit the recognized result of mouth status to the Morse-code text input system. Integrating the software subsystem with the hardware subsystem, we implement a text input system by using lips image recognition programmed in LabVIEW language. We hope the system can help the seriously disabled to communicate with normal people more easily.

  5. A LabVIEW based user-friendly nano-CT image alignment and 3D reconstruction platform

    CERN Document Server

    Wang, Shenghao; Wang, Zhili; Gao, Kun; Wu, Zhao; Zhu, Peiping; Wu, Ziyu

    2014-01-01

    X-ray nanometer computed tomography (nano-CT) offers applications and opportunities in many scientific researches and industrial areas. Here we present a user-friendly and fast LabVIEW based package running, after acquisition of the raw projection images, a procedure to obtain the inner structure of the sample under analysis. At first, a reliable image alignment procedure fixes possible misalignments among image series due to mechanical errors, thermal expansion and other external contributions, then a novel fast parallel beam 3D reconstruction performs the tomographic reconstruction. The remarkable improved reconstruction after the image calibration confirms the fundamental role of the image alignment procedure. It minimizes blurring and additional streaking artifacts present in a reconstructed slice that cause loss of information and faked structures in the observed material. The nano-CT image alignment and 3D reconstruction LabVIEW package significantly reducing the data process, makes faster and easier th...

  6. TELECOM LAB

    CERN Multimedia

    IT-CS-TEL Section

    2001-01-01

    The Telecom Lab is moving from Building 104 to Building 31 S-026, with its entrance via the ramp on the side facing Restaurant n°2. The help desk will thus be closed to users on Tuesday 8 May. On May 9, the Lab will only be able to deal with problems of a technical nature at the new address and it will not be able to process any new subscription requests throughout the week from 7 to 11 May. We apologise for any inconvenience this may cause and thank you for your understanding.

  7. Design and implementation of ATLAS compiler based on LabVIEW%基于LabVIEW的ATLAS编译器设计与实现

    Institute of Scientific and Technical Information of China (English)

    吴奈; 潘文平; 王剑楠

    2016-01-01

    Facing on the problem of less domestic ATLAS compiler and the one abroad which is expensive and difficult to popular-ize ,this article proposed a ATLAS compiler which compiled the ATLAS test statement under the LabVIEW development environ-ment .The compiler adopted LabVIEW object-oriented programming approach to the development of various parts ,reducing repeti-tive tasks and satisfying scalability and maintainability of the compiler .Simultaneously ,the compiler adopted IVI norms to achieve the management of each instrument driver function ,which completed the conversion of ATLAS test statement to the executable statements .Practice has proved that the compiler possessed short development cycle ,scalability and lower development costs ,which has significant reference for the further development of ATLAS language compiler .%针对目前ATLAS语言编译器国内开发较少,而国外ATLAS 编译器价格昂贵不易普及的问题,提出一种在LabVIEW开发环境下进行ATLAS 测试语句编译的ATLAS 编译器,该编译器采用LabVIEW面向对象的编程方式对各个部分进行开发,减少ATLAS编译器开发的重复性工作,满足编译器的扩展性与可维护性.同时,采用IVI规范实现编译器对各个仪器驱动函数的管理,完成了ATLAS 测试语句到实际LabVIEW可执行语句的转化.实践证明,该编译器开发周期短,扩展性强,开发成本较低,对于ATLAS语言编译器的进一步开发具有借鉴意义.

  8. Wave-based liquid-interface metamaterials

    Science.gov (United States)

    Francois, N; Xia, H; Punzmann, H; Fontana, P W; Shats, M

    2017-01-01

    The control of matter motion at liquid–gas interfaces opens an opportunity to create two-dimensional materials with remotely tunable properties. In analogy with optical lattices used in ultra-cold atom physics, such materials can be created by a wave field capable of dynamically guiding matter into periodic spatial structures. Here we show experimentally that such structures can be realized at the macroscopic scale on a liquid surface by using rotating waves. The wave angular momentum is transferred to floating micro-particles, guiding them along closed trajectories. These orbits form stable spatially periodic patterns, the unit cells of a two-dimensional wave-based material. Such dynamic patterns, a mirror image of the concept of metamaterials, are scalable and biocompatible. They can be used in assembly applications, conversion of wave energy into mean two-dimensional flows and for organising motion of active swimmers. PMID:28181490

  9. Liquid-crystal-based hyperspectral image projector

    Science.gov (United States)

    Linnenberger, Anna; Masterson, Hugh; Rice, Joseph P.; Stockley, Jay

    2010-04-01

    A hyperspectral image projector (HIP) is introduced that is built with liquid crystal based spatial light modulators (SLM) as opposed to micromirror arrays. The use of an SLM as a broadband intensity modulator presents several benefits to this application. With slight modifications to the SLM design, SLMs can be built for a wide range of spectral regimes, ranging from the ultraviolet (UV) to the long-wavelength infrared (LWIR). SLMs can have a large pixel pitch, significantly reducing diffraction in the mid-wavelength infrared (MWIR) and LWIR. Liquid crystal based devices offer direct analog intensity modulation, thus eliminating flicker from time sequential drive schemes. SLMs allow for an on-axis configuration, enabling a simple and compact optical layout. The design of the HIP system is broken into two parts consisting of a spectral and spatial engine. In the spectral engine a diffraction grating is used to disperse a broadband source into spectral components, where an SLM modulates the relative intensity of the components to dynamically generate complex spectra. The recombined output is fed to the spatial engine which is used to construct two-dimensional scenes. The system is used to simulate a broad range of real world environments, and will be delivered to the National Institute of Standards and Technology as an enabling tool for the development of calibration standards and performance testing techniques for multispectral and hyperspectral imagers. The focus of this paper is on a visible-band HIP system; however, related work is presented with regard to SLM use in the MWIR and LWIR.

  10. Arduino-Based Data Acquisition into Excel, LabVIEW, and MATLAB

    Science.gov (United States)

    Nichols, Daniel

    2017-04-01

    Data acquisition equipment for physics can be quite expensive. As an alternative, data can be acquired using a low-cost Arduino microcontroller. The Arduino has been used in physics labs where the data are acquired using the Arduino software. The Arduino software, however, does not contain a suite of tools for data fitting and analysis. The data are typically gathered first and then imported manually into an analysis program. There is a way, however, that allows data gathered by the Arduino to be imported in real time into a data analysis package. Illustrated in this article are add-ins for Excel, MATLAB, and LabVIEW that import data directly from the Arduino and allow for real-time plotting and analysis.

  11. Accessible morphohistochemical labs-on-a-chip based on different counting chambers' grids: microfluidic morphodynamical workstations

    OpenAIRE

    Gradov O.V.; Notchenko A.V.

    2012-01-01

    An accessible design of autonomous labs on the chip which do not require a special reader is developed. The proposed device uses hemocytometric counting chambers for determinati on of concentration of cells, isolated by a special device for cell sedimentation. A system of automated Rf-identification of chambers in the long-term storage is proposed which provides new morphometric data at various stages of cultivation or biomonitoring. A ne w diffraction method of calcu-lation and fingerprinti...

  12. Integrated lab-on-chip biosensing systems based on magnetic particle actuation--a comprehensive review.

    Science.gov (United States)

    van Reenen, Alexander; de Jong, Arthur M; den Toonder, Jaap M J; Prins, Menno W J

    2014-06-21

    The demand for easy to use and cost effective medical technologies inspires scientists to develop innovative lab-on-chip technologies for point-of-care in vitro diagnostic testing. To fulfill medical needs, the tests should be rapid, sensitive, quantitative, and miniaturizable, and need to integrate all steps from sample-in to result-out. Here, we review the use of magnetic particles actuated by magnetic fields to perform the different process steps that are required for integrated lab-on-chip diagnostic assays. We discuss the use of magnetic particles to mix fluids, to capture specific analytes, to concentrate analytes, to transfer analytes from one solution to another, to label analytes, to perform stringency and washing steps, and to probe biophysical properties of the analytes, distinguishing methodologies with fluid flow and without fluid flow (stationary microfluidics). Our review focuses on efforts to combine and integrate different magnetically actuated assay steps, with the vision that it will become possible in the future to realize integrated lab-on-chip biosensing assays in which all assay process steps are controlled and optimized by magnetic forces.

  13. ABrIL - Advanced Brain Imaging Lab : a cloud based computation environment for cooperative neuroimaging projects.

    Science.gov (United States)

    Neves Tafula, Sérgio M; Moreira da Silva, Nádia; Rozanski, Verena E; Silva Cunha, João Paulo

    2014-01-01

    Neuroscience is an increasingly multidisciplinary and highly cooperative field where neuroimaging plays an important role. Neuroimaging rapid evolution is demanding for a growing number of computing resources and skills that need to be put in place at every lab. Typically each group tries to setup their own servers and workstations to support their neuroimaging needs, having to learn from Operating System management to specific neuroscience software tools details before any results can be obtained from each setup. This setup and learning process is replicated in every lab, even if a strong collaboration among several groups is going on. In this paper we present a new cloud service model - Brain Imaging Application as a Service (BiAaaS) - and one of its implementation - Advanced Brain Imaging Lab (ABrIL) - in the form of an ubiquitous virtual desktop remote infrastructure that offers a set of neuroimaging computational services in an interactive neuroscientist-friendly graphical user interface (GUI). This remote desktop has been used for several multi-institution cooperative projects with different neuroscience objectives that already achieved important results, such as the contribution to a high impact paper published in the January issue of the Neuroimage journal. The ABrIL system has shown its applicability in several neuroscience projects with a relatively low-cost, promoting truly collaborative actions and speeding up project results and their clinical applicability.

  14. Coupling paper-based microfluidics and lab on a chip technologies for confirmatory analysis of trinitro aromatic explosives.

    Science.gov (United States)

    Pesenti, Alessandra; Taudte, Regina Verena; McCord, Bruce; Doble, Philip; Roux, Claude; Blanes, Lucas

    2014-05-20

    A new microfluidic paper-based analytical device (μPAD) in conjunction with confirmation by a lab on chip analysis was developed for detection of three trinitro aromatic explosives. Potassium hydroxide was deposited on the μPADs (0.5 μL, 1.5 M), creating a color change reaction when explosives are present, with detection limits of approximately 7.5 ± 1.0 ng for TNB, 12.5 ± 2.0 ng for TNT and 15.0 ± 2.0 ng for tetryl. For confirmatory analysis, positive μPADs were sampled using a 5 mm hole-punch, followed by extraction of explosives from the punched chad in 30 s using 20 μL borate/SDS buffer. The extractions had efficiencies of 96.5 ± 1.7%. The extracted explosives were then analyzed with the Agilent 2100 Bioanalyzer lab on a chip device with minimum detectable amounts of 3.8 ± 0.1 ng for TNB, 7.0 ± 0.9 ng for TNT, and 4.7 ± 0.2 ng for tetryl. A simulated in-field scenario demonstrated the feasibility of coupling the μPAD technique with the lab on a chip device to detect and identify 1 μg of explosives distributed on a surface of 100 cm(2).

  15. Experimental Investigations on the Interactions Between Liquids and Structures to Passively Control the Surface-Driven Capillary Flow in Microfluidic Lab-On Systems to Separate the Microparticles for Bioengineering Applications

    Science.gov (United States)

    Mukhopadhyay, Subhadeep

    In this research paper, total 246 individual microfluidic devices have been fabricated by maskless lithography, hot embossing lithography and direct bonding technique. The effect of surface area to volume ratio on the surface-driven capillary flow of different liquids has been experimentally investigated in these microfluidic devices fabricated by polymethylmethacrylate (PMMA). Also, the individual effects of liquid viscosity and surface wettability on the surface-driven capillary flow of different liquids are experimentally investigated. The polystyrene particles of 10μm diameters have been separated from the aqueous microparticle suspensions in the microfluidic lab-on-a-chip systems with 100% separation efficiency. Also, the polystyrene particles of 5μm diameters have been separated from a different set of aqueous microparticle suspensions in the microfluidic lab-on-a-chip systems with 100% separation efficiency. The individual designs of the microfluidic lab-on-a-chip systems are a novel approach in this research paper. The effect of surface area to volume ratio on the separation time is experimentally investigated as another novel approach of this research paper.

  16. 基于LabVIEW的风洞试验控制系统设计%Design of Wind Tunnel Test Control System Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    李娜; 王晓荣

    2011-01-01

    According to requirements of wind tunnel test, a performance test system for compact heat exchangers was presented. The system has the function of test, data acquisition, data storage and analysis, and takes LabVIEW as the developer tool to have virtual instrument and testing technology combined.%按照风洞试验系统的试验要求,使用LabVIEW作为开发工具,将虚拟仪器技术与测试技术结合起来,建立了集试验系统、数据采集、存储与分析为一体的紧凑式换热嚣性能测试系统.

  17. Neuromuscular Electrical Stimulation and Recording System Based on Lab VIEW%基于LabVIEW的神经肌肉电刺激与记录系统

    Institute of Scientific and Technical Information of China (English)

    沈强; 蒋大宗

    2001-01-01

    神经肌肉电刺激在康复工程、神经科学等许多领域有重要意义.本文给出了一种基于LabVIEW的神经肌肉电刺激与记录系统.该系统可以输出可控的电脉冲刺激,并利用LabVIEW简单方便地实现了数据的采集和刺激器控制信号的产生.该系统体积小、使用方便灵活、可以很方便地实现其它类似功能.该系统在神经肌肉刺激的研究和神经及肌肉系统疾病的临床诊断中都有很大的应用价值.

  18. 基于LabVIEW RT的硬件在环仿真%The Simulation of Hardware-in-the-Loop based on LabVIEW RT

    Institute of Scientific and Technical Information of China (English)

    吴海东; 郭孔辉; 卢荡

    2010-01-01

    利用实时仿真环境LabVIEW RT,构建了包括整车转向盘转角、油门、制动物理信号的硬件在环仿真系统.采用实时车辆动力学软件CarSim RT建立了车辆模型,并利用所搭建的试验台架进行了HIL仿真.结果表明,利用LabVIEW RT和CarSim RT能快速搭建面向整车开发的HIL系统,所建系统性价比高,而且有很好的实时性和扩展性.

  19. 基于LabVIEW的独立光伏监测系统%The stand-alone photovoltaic supervision system based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    余章平; 谷刚; 张维威

    2008-01-01

    介绍了独立光伏监测系统的结构及工作原理.针对独立光伏系统的特性,在LabVIEW环境下应用NI公司的Fieldpoint 系列I/O模块和网络模块构建监测系统,对独立光伏系统的参数进行实时记录存储并绘制成历史曲线,通过LabVIEW的网络功能进行网上发布,用户可以通过浏览器对独立光伏系统进行在线监测和维护.

  20. Research on the Method Based on LabVlEW for Automatically Generating Detection Report%基于LabVIEW的检测报告自动生成方法研究

    Institute of Scientific and Technical Information of China (English)

    李磊; 杨峰; 何耀

    2012-01-01

    In order to automatically printout the detection results and judgment conclusion from certain composite detector that is developed based on LabVIEW platform for radar receiver in accordance with designated template format and sequence, the global variable technology and Word document report generation technology have been researched. By adopting Report Generation Toolkit and LabVIEW programming technology, the automatic report generation program for composite detection report is designed. Various detection results and judgment conclusion can be recorded in real time; and the report based on the format of designated Word template can be generated automatically with this program.%为了将检测结果和判别结论按照给定的模版格式和顺序自动地打印出来,研究了LabVIEW中的全局变量技术和Word文档检测报告生成技术.利用Report Generation Toolkit 工具包和LabVIEW编程技术,设计了组合检测报告自动生成程序.该程序能够实时记录各种检测结果和判别结论,并自动生成基于指定Word模板格式的检测报告.

  1. Detergent-Based Isolation of Yeast Membrane Rafts: An Inquiry-Based Laboratory Series for the Undergraduate Cell Biology or Biochemistry Lab

    Science.gov (United States)

    Willhite, D. Grant; Wright, Stephen E.

    2009-01-01

    Lipid rafts have been implicated in numerous cellular processes including cell signaling, endocytosis, and even viral infection. Isolation of these lipid rafts often involves detergent treatment of the membrane to dissolve nonraft components followed by separation of raft regions in a density gradient. We present here an inquiry-based lab series…

  2. Detergent-Based Isolation of Yeast Membrane Rafts: An Inquiry-Based Laboratory Series for the Undergraduate Cell Biology or Biochemistry Lab

    Science.gov (United States)

    Willhite, D. Grant; Wright, Stephen E.

    2009-01-01

    Lipid rafts have been implicated in numerous cellular processes including cell signaling, endocytosis, and even viral infection. Isolation of these lipid rafts often involves detergent treatment of the membrane to dissolve nonraft components followed by separation of raft regions in a density gradient. We present here an inquiry-based lab series…

  3. Two dimensional, electronic particle tracking in liquids with a graphene-based magnetic sensor array.

    Science.gov (United States)

    Neumann, Rodrigo F; Engel, Michael; Steiner, Mathias

    2016-07-14

    The investigation and control of liquid flow at the nanometer scale is a key area of applied research with high relevance to physics, chemistry, and biology. We introduce a method and a device that allows the spatial resolution of liquid flow by integrating an array of graphene-based magnetic (Hall) sensors that is used for tracking the movement of magnetic nanoparticles immersed in a liquid under investigation. With a novel device concept based on standard integration processes and experimentally verified material parameters, we numerically simulate the performance of a single sensor pixel, as well as the whole sensor array, for tracking magnetic nanoparticles having typical properties. The results demonstrate that the device enables (a) the detection of individual nanoparticles in the liquid with high accuracy and (b) the reconstruction of a particle's flow-driven trajectory across the integrated sensor array with sub-pixel precision as a function of time, in what we call the "Magnetic nanoparticle velocimetry" technique. Since the method does not rely on optical detection, potential lab-on-chip applications include particle tracking and flow analysis in opaque media at the sub-micron scale.

  4. Base stable quaternary ammonium ionic liquids

    OpenAIRE

    Lethesh, Kallidanthiyil Chellappan; Dehaen, Wim; Binnemans, Koen

    2014-01-01

    Ionic liquids with the bis(2-ethylhexyl)dimethylammonium cation, [BEDMA]+, were prepared by a halide-free route starting from the readily available secondary amine bis(2-ethylhexyl)amine. The following anions were considered: chloride, bromide, iodide, nitrate, hydrogensulphate, dihydrogenphosphate, formate, acetate, propionate, trifluoroacetate, methyl sulphate, methanesulphonate, tosylate, isonicotinate, nicotinate and picolinate. Several of the compounds are room-temperature ionic liquids,...

  5. Lab architecture

    Science.gov (United States)

    Crease, Robert P.

    2008-04-01

    There are few more dramatic illustrations of the vicissitudes of laboratory architecturethan the contrast between Building 20 at the Massachusetts Institute of Technology (MIT) and its replacement, the Ray and Maria Stata Center. Building 20 was built hurriedly in 1943 as temporary housing for MIT's famous Rad Lab, the site of wartime radar research, and it remained a productive laboratory space for over half a century. A decade ago it was demolished to make way for the Stata Center, an architecturally striking building designed by Frank Gehry to house MIT's computer science and artificial intelligence labs (above). But in 2004 - just two years after the Stata Center officially opened - the building was criticized for being unsuitable for research and became the subject of still ongoing lawsuits alleging design and construction failures.

  6. The Image Recognition of Mobile Robot Based on CIE Lab Space

    Directory of Open Access Journals (Sweden)

    Xuan Zou

    2014-01-01

    Full Text Available The image recognition of mobile robot is to extract the effective target information. The essence of image extraction is image segmentation. By extracting and distinguishing planar objects and three-dimensional objects, we propose two new algorithms. The color image is extracted by using CIE Lab Space. Then we propose a comparison method through the collection of two image samples. According to the principle of geometric distortion in the geometric space, we can easily distinguish the planar object in the environment. Therefore, Experimental results show that the combination of these two methods is accurate and fast in the color image recognition.

  7. [A design of simple ventilator control system based on LabVIEW].

    Science.gov (United States)

    Pei, Baoqing; Xu, Shengwei; Li, Hui; Li, Deyu; Pei, Yidong; He, Haixing

    2011-01-01

    This paper designed a ventilator control system to control proportional valves and motors. It used LabVIEW to control the object mentioned above and design ,validate, evaluate arithmetic, and establish hardware in loop platform. There are two system' s hierarchies. The high layer was used to run non-real time program and the low layer was used to run real time program. The two layers communicated through TCP/IP net. The program can be divided into several modules, which can be expanded and maintained easily. And the harvest in the prototype designing can be seamlessly used to embedded products. From all above, this system was useful in employing OEM products.

  8. LabVIEW-based control and data acquisition system for cathodoluminescence experiments.

    Science.gov (United States)

    Bok, J; Schauer, P

    2011-11-01

    Computer automation of cathodoluminescence (CL) experiments using equipment developed in our laboratory is described. The equipment provides various experiments for CL efficiency, CL spectra, and CL time response studies. The automation was realized utilizing the graphical programming environment LabVIEW. The developed application software with procedures for equipment control and data acquisition during various CL experiments is presented. As the measured CL data are distorted by technical limitations of the equipment, such as equipment spectral sensitivity and time response, data correction algorithms were incorporated into the procedures. Some examples of measured data corrections are presented.

  9. Workspace: LAB

    DEFF Research Database (Denmark)

    Binder, Thomas; Lundsgaard, Christina; Nørskov, Eva-Carina

    2007-01-01

    På mange arbejdspladser viger man tilbage fra at inddrage medarbejderne når der igangsættes større forandringer. Workspace:lab er et bud på en inddragende udviklingsproces hvor dialog og eksperimenter står i centrum. Ved at samle såvel medarbejdere som ledelse og rådgivere på et mindre antal...

  10. 基于LabVIEW的光伏发电监测系统通信差错控制%Error-control in Monitoring System of Stand-alone Photovoltaic Power System Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    张杰; 张轶; 刘志辉

    2011-01-01

    The purpose of communication in monitoring system is to send information reliably and fast.The communication systems adopt error-controLThis paper presents error-control principle of CRC (cyclical redundancy check),gives the CRC-16 algorithm software flow chart, designs the software procedure using LabVIEW language,and finally makes a confirmation in a real-time photovoltaic monitoring system based on LabVIEW.Practical applications and experiments show that the system has higher system reliability, stronger site environmental adaptability, and their application fields were extended.%光伏发电监测系统通信必须快速可靠,因此采用了差错控制.分析了CRC循环冗余校验的差错控制原理,给出了算法的程序流程图,着重介绍了基于图形化编程的LabVIEW语言环境下的查表法校验程序,程序已应用于独立光伏发电实时监测系统中.现场应用和实验表明,该系统具有较高的数据可靠性和较强的环境适应性,可广泛应用于基于LabVIEW的监测系统中.

  11. 基于 LabVIEW 的叶片厚度远程监控系统%Design of a Monitoring System with Remote Access Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    刘九庆; 朱福安; 王楠; 熊美芳; 于博

    2015-01-01

    网络技术经过近现代的高速发展已经成为一种非常成熟、具有高稳定性的应用技术,基于浏览器可以通过网络技术进行远程通信的优势已经被广泛应用。为此,基于该模式,利用虚拟仪器软件开发工具 LabVIEW设计出了植物叶片厚度微增量检测仪远程监控系统。该监控系统服务器端利用虚拟仪器软件开发工具LabVIEW设计出植物叶片厚度微增量检测仪的监测系统,并且利用所熟知的 TCP 网络协议通过 G 语言编程进行网络通信,实现客户端通过浏览器对植物叶片厚度微增量检测仪数据变化进行远程监控。最后,对基于 LabVIEW 的植物叶片厚度微增量仪远程监控系统的优势进行了说明。%With the high-speed development of internet technology ,the telecommuncation which based on the browser/server mode shows unique advatage .In this paper , we designed a monitoring system with remote access for a Non -de-structive Contact Measuring Instrument .And we made use of the Virtual Instrument-LabVIEW design this monitoring sys-tem .The server side of the monitoring system is designed by the LabVIEW .Because there are a TCP communications pro-tocols in the LabVIEW ,we made use of the TCP communications protocols to realize the remote supervisory .Then we can monitor and sontrol the variation in thickness of the plant leaves with remote access .At last,the article introduce the ad-vantage of the mondtoring system with remote access based on the LabVIEW .

  12. A molecularly imprinted polymer based a lab-on-paper chemiluminescence device for the detection of dichlorvos

    Science.gov (United States)

    Liu, Wei; Guo, Yumei; Luo, Jing; Kou, Juan; Zheng, Hongyan; Li, Baoxin; Zhang, Zhujun

    2015-04-01

    In this work, a new molecularly imprinted polymer (MIP) based lab-on-paper device with chemiluminescence (CL) detection of dichlorvos (DDV) was designed. With the circle-shaped device, the MIP layer with certain depth was synthesized and adsorbed on the paper surface and DDV can be selectively imprinted on it. The adsorption and washing procedures can be achieved well on the paper-based chip. The paper-based device was fabricated by a simple cutting method and many chips can be made at the same time. On the basis of DDV enhancing CL of luminol-H2O2 greatly, the proposed MIP based lab-on-paper CL device showed better selectivity to DDV and it has been applied to the determination of DDV in vegetables in the range of 3.0 ng/mL-1.0 μg/mL with the detection limit of 0.8 ng/mL. This study has made a successful attempt in the development of highly selective and sensitive monitoring of DDV in real samples and will provide a new approach for sensitive and specific assay in environmental monitoring.

  13. Microalgae based biorefinery: evaluation of oil extraction methods in terms of efficiency, costs, toxicity and energy in lab-scale

    Directory of Open Access Journals (Sweden)

    Ángel Darío González-Delgado

    2013-06-01

    Full Text Available Several alternatives of microalgal metabolites extraction and transformation are being studied for achieving the total utilization of this energy crop of great interest worldwide. Microalgae oil extraction is a key stage in microalgal biodiesel production chains and their efficiency affects significantly the global process efficiency. In this study, a comparison of five oil extraction methods in lab-scale was made taking as additional parameters, besides extraction efficiency, the costs of method performing, energy requirements, and toxicity of solvents used, in order to elucidate the convenience of their incorporation to a microalgae-based topology of biorefinery. Methods analyzed were Solvent extraction assisted with high speed homogenization (SHE, Continuous reflux solvent extraction (CSE, Hexane based extraction (HBE, Cyclohexane based extraction (CBE and Ethanol-hexane extraction (EHE, for this evaluation were used the microalgae strains Nannochloropsis sp., Guinardia sp., Closterium sp., Amphiprora sp. and Navicula sp., obtained from a Colombian microalgae bioprospecting. In addition, morphological response of strains to oil extraction methods was also evaluated by optic microscopy. Results shows that although there is not a unique oil extraction method which excels in all parameters evaluated, CSE, SHE and HBE appears as promising alternatives, while HBE method is shown as the more convenient for using in lab-scale and potentially scalable for implementation in a microalgae based biorefinery

  14. Cone-beam micro-CT system based on LabVIEW software.

    Science.gov (United States)

    Ionita, Ciprian N; Hoffmann, Keneth R; Bednarek, Daniel R; Chityala, Ravishankar; Rudin, Stephen

    2008-09-01

    Construction of a cone-beam computed tomography (CBCT) system for laboratory research usually requires integration of different software and hardware components. As a result, building and operating such a complex system require the expertise of researchers with significantly different backgrounds. Additionally, writing flexible code to control the hardware components of a CBCT system combined with designing a friendly graphical user interface (GUI) can be cumbersome and time consuming. An intuitive and flexible program structure, as well as the program GUI for CBCT acquisition, is presented in this note. The program was developed in National Instrument's Laboratory Virtual Instrumentation Engineering Workbench (LabVIEW) graphical language and is designed to control a custom-built CBCT system but has been also used in a standard angiographic suite. The hardware components are commercially available to researchers and are in general provided with software drivers which are LabVIEW compatible. The program structure was designed as a sequential chain. Each step in the chain takes care of one or two hardware commands at a time; the execution of the sequence can be modified according to the CBCT system design. We have scanned and reconstructed over 200 specimens using this interface and present three examples which cover different areas of interest encountered in laboratory research. The resulting 3D data are rendered using a commercial workstation. The program described in this paper is available for use or improvement by other researchers.

  15. 基于LabVIEWd的xPC-Target人机界面的研究综述%Research and Application of Electric Power System Monitoring Interface Based on the LabVIEW and xPC

    Institute of Scientific and Technical Information of China (English)

    袁威

    2016-01-01

    针对实时仿真器xPC传统界面单一;难操作;不友好和不能独立脱离Simulink运行问题,本文分析基于LabVIEW开发出一种能够解决以上问题的人机界面。探讨了xPC实时仿真平台界面的开发原理,分别对xPC的接口函数API、LabVIEW的调用库函数节点和界面实现过程及原理进行详细分析,并且在C语言环境开发编写加载和释放API的DLL文件。最后LabVIEW通过调用API构建xPC仿真平台实时控制功能的图形化界面,分析表明利用LabVIEW开发的界面与xPC自带的传统界面相比,更友好,美观,易操作并能脱离MATLAB/Simulink运行,具有一定的工程实践意义。%Because the traditional interface of real-time simulator xPC is single, difficult to operate, not friendly and cannot run without Simulink, the intention of this paper is to develop a Man-interface to solve the above problems based on LabVIEW. The paper discusses the development principle of the interface of xPC hardware simulation platform. The interface functions of API, library function node of LabVIEW, the process and principle of the interface are analyzed in detail, and the xPCInitAPI and xPCFreeAPI dynamic link library are developed to achieve the function of loading and unloading of .DLL files in C language environment. Finally, the graphical interface of real time control function of xPC simulation platform is constructed by calling API. The analysis show that the use of LabVIEW development of the interface is friendlier and more beautiful than the traditional interface of xPC, and easy to operate. Most importantly, it can run without MATLAB/Simulink and has a certain practical significance.

  16. Design of Real-time ECG Acquisition System Based on LabVIEW%基于LabVIEW的实时心电信号采集系统的设计

    Institute of Scientific and Technical Information of China (English)

    成清清; 吴蒙

    2013-01-01

    In order to acquire real-time ECG data and reduce costs,design a system of ECG data acquisition based on LabVIEW. The sys-tem is composed of hardware and software. Hardware is made up of signal acquisition and processing circuit and MSP430 microcontroller for AD conversion. The software mainly contains configuring LabVIEW communication module to realize serial communication with MSP430 and uses robust signal processing capabilities of LabVIEW and wavelet transformation to remove noise,multi-resolution decom-posing,and then reconstruct noiseless QRS,detect peak of R wave and finally calculate the heart rate. It also uses LabVIEW friendly user interface for real-time displaying received data to make the data more intuitive and read more easily. The designed system runs stably and achieves good result in the experiment.%  为了实现对心电信号实时监测,且尽可能节约成本,文中设计了一套基于LabVIEW的心电信号采集系统。系统的设计分为硬件和软件两部分:硬件部分主要包括信号采集、信号调理及MSP430单片机的AD转换电路;软件部分主要是通过配置LabVIEW通信模块与单片机实现串口通信,并利用其功能强大的高级信号处理包,借助于小波变换的优势对心电信号进行去噪、多分辨率分解等处理,最后重建无噪的QRS波,并检测R波峰值,从而计算心率。文中还利用LabVIEW友好的用户界面对接收的数据及处理过程进行实时波形显示,使数据更直观、读取更方便。本系统在实验的过程中,运行较稳定,取得了良好的结果。

  17. Photoresponsive Liquid Crystals Based on Dihydroazulene

    DEFF Research Database (Denmark)

    Petersen, Anne Ugleholdt

    alignment between the transition dipole moment and the direction of the nematic host,showing that azulene could be a useful dye for doping into liquid crystalline host materials.As esters are a commonly used linking group in liquid crystalline chemistry, it was chosen toinvestigate the physical properties...... of a series of thioester analogues. Only few examples of liquidcrystalline thioesters have been reported in the literature. It was shown that these materials haveindeed been overlooked in the field of liquid crystal chemistry, as they were found to showinteresting properties.Chiral azulenes were made......, and a synthesis of alinear “double DHA”. As these projects did not end up being viable strategies for liquid crystallinematerials, they are not included in the thesis but the articles are attached in the appendix....

  18. 基于USB串口的LabVIEW与MSP430通信实现%Realization of the Communication Between LabVIEW and MSP430 Based on Serial Port USB

    Institute of Scientific and Technical Information of China (English)

    张杰; 张轶; 王晓刚; 刘志辉

    2011-01-01

    为了对小型独立光伏发电装置进行状态监测,设计了一种基于LabVIEW和MSP430单片机的USB串口通信系统.用高精度的USB-UAKT桥接器CP2102将MSP430的UART0转换成USB口,通过USB电缆实现上层监测和下位控制器间的数据通信.通信采用Modbus-RTU协议并结合CRC校验方式,下位机为从站,上位机为主站,在LabVIEW和C51编程环境下编写了通信程序.现场应用和实验表明,该系统具有较高的数据可靠性和较强的环境适应性,可广泛应用于测控系统中.%In order for independet photovoltaic power generation device status monitoring,a communication system is designed between LabVIEW and MSP430 Based on serial port USB.This paper utilizes CP2102 to upgrade UART for use with USB,and the data communication is executed through USB serial port between LabVIEW and MSP430.Under the Modbus-RTU communication protocol, the software procedure using LabVIEW language and C51 language is designed, and finally makes a confirmation in a real-time photovoltaic monitoring system.Practical application and experiments show that the system has higher system reliability, stronger site environmental adaptability, and their application fields were extended.

  19. 基于LabVIEW的汽车ABS测试系统设计%Design of ABS Testing System Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    张文广; 杜春臣; 司利增

    2012-01-01

    ABS是汽车的一种重要主动安全装置.以图形化编程软件LabVIEW为核心,结合数据采集卡,设计了汽车ABS测试系统.该系统能够实现制动车速、制动距离、角速度、滑移率等性能参数的实时显示与存储,便于对ABS性能进行分析以及对控制算法进行优化改进,从而为开发和研制汽车防抱死制动系统提供了测试依据.%ABS is an important active safety device in a vehicle. This paper uses the graphical programming software LabVIEW as the core and combines the data acquisition card to design the car ABS testing system. The braking performance real-time display and storage such as braking speed, braking distance, angular velocity and slip rate can be realized ,in order analyze the ABS performance and improve the control algorithm. Form this the testing basis is provided for the development of automobile anti-lock braking system and its research.

  20. Design of Bar Code Automatic Printing System Based on LabVIEW%基于LabVIEW的条码自动打印系统设计

    Institute of Scientific and Technical Information of China (English)

    周先飞; 李敏; 杨会伟

    2016-01-01

    汽车行业中各个设备都来自不同的供应商,要实现产品溯源需从条码去区别。针对汽车大灯产品检测系统之后的自动打印条码,实现检测过程的自动化要求。提出了采用单片机制作的数据采集卡和LabVIEW建立的上位机软件,实现对检测完好的产品进行条码的自动打印输出,在上位机中可以对不同型号的产品进行条码的切换,在生产线上具有完全自动化功能,经现场使用,稳定性良好。%In automotive industry ,each equipment comes from different suppliers ,it needs bar codes to distinguish the products. Towards the automatic printing of bar codes after testing of headlight product , the paper realizes the automation of testing process. This paper presents MCU for DAQ and labVIEV for upper computer softwave ,to realize the automatic printing of bar codes tested ,it can change the bar codes in upper computer for differen products. The system has automation function ,and has good stability proved by field use.

  1. Development of a Rocket Control Box Tester Based on LabVIEW%基于LabVIEW的某型火箭控制盒测试仪的研制

    Institute of Scientific and Technical Information of China (English)

    刘艳菲

    2012-01-01

    本文介绍了一款基于LabVIEW开发平台下的火箭控制盒测试仪的开发过程,主要从硬件构建和软件开发两方面进行论述,利用虚拟仪器技术开发的该测试仪能够有效地实现火箭控制盒所有性能指标的测试任务。%This article introduces the development process of a rocket control box tester based on LabVIEW, and mainly discusses the construction of hardware and software development. The tester based on virtual instru- ments technology can effectively carry on overall examination to the rocket control box.

  2. Profile based motion generation for actuators using LabVIEW software

    Science.gov (United States)

    Yaragal, Bhagyashree M.; Desai, Abilash; Dhadoti, Deepak; Prabhu, Vijay

    2016-09-01

    Now a day's simulation has become great tool for designing of complex problems and to get the accurate results. Simulating something will give the appropriate result without actually building the model. LabVIEW software is used for the actuator simulation and to move the actuator on the path generated by this software. Defining of the path for the actuator is known as motion profile and it can be achieved by using the motion controllers. One of the prior control techniques used is a PID (proportional integral derivative) control and it is broadly utilized as a part of criticism control of mechanical procedures in early years and continued to be the main generally utilized controller in procedure controls till today.

  3. SplitRFLab: A MATLAB GUI toolbox for receiver function analysis based on SplitLab

    Science.gov (United States)

    Xu, Mijian; Huang, Hui; Huang, Zhouchuan; Wang, Liangshu

    2016-02-01

    We add new modules for receiver function (RF) analysis in SplitLab toolbox, which includes the manual RF analysis module, automatic RF analysis and related quality control modules, and H- k stacking module. The updated toolbox (named SplitRFLab toolbox), especially its automatic RF analysis module, could calculate the RFs quickly and efficiently, which is very useful in RF analysis with huge amount of seismic data. China is now conducting the ChinArray project that plans to deploy thousands of portable stations across Chinese mainland. Our SplitRFLab toolbox may obtain reliable RF results quickly at the first time, which provide essentially new constraint to the crustal and mantle structures.

  4. Ionic-liquid-based dispersive liquid-liquid microextraction for high-throughput multiple food contaminant screening.

    Science.gov (United States)

    Ho, Yee-Man; Tsoi, Yeuk-Ki; Leung, Kelvin Sze-Yin

    2013-12-01

    This paper describes an innovation of dispersive liquid-liquid microextraction enabling multiple-component analysis of eight high-priority food contaminants in two chemically distinctive families: Sudan dyes and phthalate plasticizers. To provide convenient sample handling for solid and solid-containing matrices, a modified dispersive liquid-liquid microextraction procedure used an extractant precoated frit to perform simultaneous filtration, solvent mixing, and phase dispersion in one simple step. A binary ionic liquid extractant system was carefully tuned to deliver high quality analysis based only on affordable LC with diode array detector instrumentation. The method is comprehensively validated for robust quantification with good precision (6.9-9.8% RSD) in a linear 2-1000 μg/L range. Having accomplished enrichment factors up to 451, the treatment enables sensitive detection at 0.09-1.01 μg/L levels. Analysis of six high-risk solid condiments and sauces further verified its practical applicability within a 70-120% recovery range. Compared to other approaches, the current dispersive liquid-liquid microextraction treatment offers major advantages in terms of minimal solvent (1.5 mL) and sample (0.1 g) consumption, ultra-high analytical throughput (6 min), and the ability to handle complex solid matrices. The idea of performing simultaneous analysis for multiple contaminants presented here fosters a more effective mode of operation in food control routines.

  5. A user-friendly nano-CT image alignment and 3D reconstruction platform based on LabVIEW

    Science.gov (United States)

    Wang, Sheng-Hao; Zhang, Kai; Wang, Zhi-Li; Gao, Kun; Wu, Zhao; Zhu, Pei-Ping; Wu, Zi-Yu

    2015-01-01

    X-ray computed tomography at the nanometer scale (nano-CT) offers a wide range of applications in scientific and industrial areas. Here we describe a reliable, user-friendly, and fast software package based on LabVIEW that may allow us to perform all procedures after the acquisition of raw projection images in order to obtain the inner structure of the investigated sample. A suitable image alignment process to address misalignment problems among image series due to mechanical manufacturing errors, thermal expansion, and other external factors has been considered, together with a novel fast parallel beam 3D reconstruction procedure that was developed ad hoc to perform the tomographic reconstruction. We have obtained remarkably improved reconstruction results at the Beijing Synchrotron Radiation Facility after the image calibration, the fundamental role of this image alignment procedure was confirmed, which minimizes the unwanted blurs and additional streaking artifacts that are always present in reconstructed slices. Moreover, this nano-CT image alignment and its associated 3D reconstruction procedure are fully based on LabVIEW routines, significantly reducing the data post-processing cycle, thus making the activity of the users faster and easier during experimental runs.

  6. Real Time Implementation of PID and Fuzzy PD Controllers for DC-Servo Motor Based on Lab View Environment

    Directory of Open Access Journals (Sweden)

    Safaa M. Z. Al-Ubaidi

    2012-06-01

    Full Text Available This paper presents an implementation of conventional PID (CPID controller using Ziegler-Nichols rules and fuzzy PD (FPD controller for position servo motor control based on Lab View (Laboratory Virtual Instrument Engineering Workbench Environment through Data Acquisition (DAQ Device PCI- 6521 of National Instrument's and Data Acquisition Accessory Board Model (CB-68LP.CPID controller is perhaps the most well-known and most widely used in industrial applications. However, it has been known that CPID controller generally don’t work well for non-linear systems, higher order and time-delayed linear system and particularly complex and vague system. To overcome these difficulties, this paper proposes to use the FPD controller for a servo motor system instead of CPID. The parameters of servo motor used are completely unknown. The FPD structure has two-input single-output and fairly similar characteristic to its conventional counterpart and provides good performance. Simple rules base are used for FPD (nine rules only. Performance evaluation was carried out via a comparison study for the proposed control scheme and other existing control scheme, such as CPID controller. The critical point for this experiment on position system is a steady state error and settling time.  The performance showing that the FPD has less settling time and zero steady state error over its CPID. The algorithms of FPD and CPID controllers are implemented using PID, Fuzzy Logic and simulation toolkits of the Lab View environment.

  7. Thermoreversible (Ionic-Liquid-Based) Aqueous Biphasic Systems.

    Science.gov (United States)

    Passos, Helena; Luís, Andreia; Coutinho, João A P; Freire, Mara G

    2016-02-04

    The ability to induce reversible phase transitions between homogeneous solutions and biphasic liquid-liquid systems, at pre-defined and suitable operating temperatures, is of crucial relevance in the design of separation processes. Ionic-liquid-based aqueous biphasic systems (IL-based ABS) have demonstrated superior performance as alternative extraction platforms, and their thermoreversible behaviour is here disclosed by the use of protic ILs. The applicability of the temperature-induced phase switching is further demonstrated with the complete extraction of two value-added proteins, achieved in a single-step. It is shown that these temperature-induced mono(bi)phasic systems are significantly more versatile than classical liquid-liquid systems which are constrained by their critical temperatures. IL-based ABS allow to work in a wide range of temperatures and compositions which can be tailored to fit the requirements of a given separation process.

  8. Image analysis for a microfluidic paper-based analytical device using the CIE L*a*b* color system.

    Science.gov (United States)

    Komatsu, Takeshi; Mohammadi, Saeed; Busa, Lori Shayne Alamo; Maeki, Masatoshi; Ishida, Akihiko; Tani, Hirofumi; Tokeshi, Manabu

    2016-11-28

    The combination of a microfluidic paper-based analytical device (μPAD) and digital image analysis is widely used for quantitative analysis with μPADs because of its easy and simple operation. Herein, we have demonstrated a quantitative analysis based on multiple color changes on a μPAD. The CIE L*a*b* color system was employed to analyse the digital images obtained with the μPAD. We made pH measurements using a universal pH-indicator showing multiple color changes for various pH values of aqueous test solutions. The detectable pH range of this method was wider than the typical grayscale-based image analysis, and we succeeded in the measurements for a wide pH range of 2-9.

  9. Implement of Artificial Neural Networks BP Algorithm Based on LabWindows/CVI%基于LabWindows/CVI的人工神经网络BP算法的实现

    Institute of Scientific and Technical Information of China (English)

    曾祥学; 罗卫华; 张斌

    2005-01-01

    提出了一种BP学习算法的改进算法,与传统BP算法相比,本算法针对传统BP算法收敛速度较慢的缺点,提出了两点改进:一是选用奇函数作为激励函数;二是改进了学习过程中不随误差变化的误差反向传播因子,并给出了该算法在LabWindows/CVI环境下的实现方法.程序运行表明,本算法使学习速度有了较显著的提高.

  10. 基于LabVIEW的蓄电池内阻测试仪的设计%Design of Battery Internal Resistance Measuring Instrument Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    刘登峰; 邵天章; 王琳

    2011-01-01

    采用暂态直流小电流电量比较法对蓄电池内阻进行测试,设计了上位机数据采集控制软件,构建了基于LabVIEW组成的实时内阻测量系统.实际运行表明,该系统实现并提高了蓄电池内阻测试的准确性和稳定性.%The battery resistance was tested by the transient DC of small current method. The data collection and control software used on upper PC was designed, and the real-time battery resistance measurement system was established. Actual operation shows that the system improved the accuracy and stability of battery resistance testing.

  11. Design of threshold denoising system for broadband time-varying signal based on LabVIEW%基于LabVIEW的宽频时变信号阈值去噪系统设计

    Institute of Scientific and Technical Information of China (English)

    张俊涛; 曹梦娜; 张涛

    2014-01-01

    A virtual denoising system w hich is fast and efficient is designed for broadband time‐varying signal by using the powerful signal processing function library based on Lab‐VIEW .The power spectrum of broadband time‐varying signal containing gaussian noise is analyzed in the paper and wavelet threshold denoising is used based on their spectral fea‐tures .The optimal parameters of thresholding methods is searched by analyzing and compa‐ring the results of different thresholding criteria and the hard and soft threshold denosing . The results show that thresholding method based on LabVIEW for broadband time‐varying signal achieves good effect and present excellent characteristics in the time‐frequency do‐m ain .%针对含有高斯噪声的宽频时变信号,利用LabVIEW强大的信号处理函数库设计了基于LabVIEW的虚拟去噪系统,该系统去噪快捷高效。对含有高斯噪声的宽频时变信号进行功率谱分析,根据其频谱特性进行小波阈值去噪,通过对各种不同阈值去噪准则及软硬阈值去噪结果进行对比分析,寻找阈值去噪方法的最优参数。结果表明,基于LabVIEW阈值去噪法对含有高斯噪声的宽频时变信号具有较好的效果,在时频域都表现了优良的特征。

  12. Design of CRDM noise waveform recording test bench based on LabVIEW%基于LabVIEW的CRDM噪声录波试验台设计

    Institute of Scientific and Technical Information of China (English)

    王斌; 高夫领; 张立蕊

    2015-01-01

    控制棒驱动机构(CRDM)是控制棒的驱动装置,它是核反应堆压力容器内惟一的可动部件,也是关键部件之一。为了提高大亚湾核电站在大修期间CRDM噪声录波试验的效率、简化试验的过程,通过对CRDM噪声录波试验进行分析研究,合理设计CRDM噪声录波试验台结构,并采用LabVIEW软件编程实现信息采集、数据记录、分析等多种功能,设计一种新的CRDM噪声录波试验台。该试验台解决了试验数据分析困难等问题,简便易行,对大亚湾核电站大修期间的CRDM试验具有重要意义。%Control rod drive mechanism (CRDM) is the driving device of control rod. It is the moveable part only and also one of the key components in nuclear reactor pressure vessel. To improve the efficiency of CRDM noise waveform recording test and simplify the test process during overhaul of Daya Bay nuclear power plant,the structure of CRDM noise waveform recording test bench was designed by analyzing the CRDM noise waveform recording test. Functions of information acquisition,data record and analysis were realized by using LabVIEW software. Then a new CRDM noise waveform recording test bench was designed, which solves the problems that is hard to analyze the test data. This test bench is meaningful for CRDM test of Daya Bay nuclear power plant.

  13. Implementation of SPI serial bus interface based on LabVIEW%基于LabVIEW的SPI串行总线接口的实现

    Institute of Scientific and Technical Information of China (English)

    赵骁; 周斌; 赵华

    2014-01-01

    In order to debug the device with SPI serial bus interface conveniently,the standard modular device of National Instruments(NI)was used to simulate SPI serial bus interface signals,LabVIEW was used to get the SPI signals in digital wave-form format,a program was designed to analysis these signals,and the hardware equipments of NI was utilized to realize the in-put and output of these signals. The experimental testing result shows that the frequency range of the output signal from the SPI interface is 0.5 Hz to 500 kHz,the input frequency range is 0.5 Hz to 900 kHz,the error is less than 10 ns. This method can be used to debug SPI serial bus interface device.%为了便于具有SPI串行总线接口设备的调试,使用美国国家仪器公司(NI)的标准模块化设备模拟SPI串行总线接口信号;采用图形化编程语言LabVIEW得到数字波形格式的SPI信号,并设计程序对此格式的信号进行解析,利用NI公司的硬件设备实现该信号的输入与输出。经过实验测试,输出SPI接口信号的频率范围是0.5 Hz~500 kHz,输入的频率范围是0.5 Hz~900 kHz,误差小于10 ns,该方法可以用于SPI串行总线接口设备的调试中。

  14. 基于LabVIEW的切削力采集和建模系统%The Acquisition and Modeling System of Cutting Force Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    陈雪华; 岳文辉

    2012-01-01

    With back cutting depth,spindle speed,feeding and cutting width as design variables,and cutting force as response,a second-order mathematical model of cutting force is built using the response surface method of statistics.The hardware test system of cutting experiment for 45 steel is built.The response surface method is incorporated in LabVIEW 8.6 programming to design the software system.By inputting the number of impact factor and the factor value scope,the software system can automatically generate a center combination experimental design scheme and it can collect,calculate and analyze the experimental data,and,finally build the response surface model.%应用统计学中的响应面方法,以背吃刀量,主轴转速,进给量和切削宽度为设计变量,切削力为响应,建立切削力的二阶数学模型。以45钢铣削试验为例搭建硬件测试系统。将响应面方法融入到LabVIEW8.6编程之中,设计软件系统。该系统功能丰富,输入影响因子的个数,给定因子的取值范围,就能自动生成中心组合设计试验方案,并对试验数据进行采集、计算和分析,得到切削力响应面模型。

  15. Automobile Engine Vibration Test Based on LabVIEW Software%基于LabVIEW的汽车发动机振动测试系统

    Institute of Scientific and Technical Information of China (English)

    杨正才; 张庆永; 邓召文

    2012-01-01

    开发了一套以PC机为硬件平台、以LabVIEW软件为开发平台,配合必要的传感器、信号调理器和数据采集卡组成的振动测试和分析系统.该系统具备数据采集、处理分析和结果显示的功能,用户可以在计算机上对汽车的振动信号进行模块化的操作.软件功能主要有信号采集、历史数据读取、数据滤波、信号分析等.该系统性能稳定,功能全面,操作简单、具有良好的扩展性和较高的性价比.%A set of vibration measurement and analysis system was researched. It took the PC as the hardware platform and the LabVIEW as the software platform,coordinating with necessary sensors,signal conditioning and data acquisition card to constitute of the whole system. It has data collection, processing analysis and results show function. The users can carry on modular operation to the vibration signal of vehicle on the computer. Software function mainly includes signal acquisition,historical data access,data-filtering, signal analysis and so on. The system is stable,full-featured and easy to operate; it has good scalability and high performance with low cost.

  16. On-line Over-voltage Detector Based on LabVIEW%基于LabVIEW的过电压在线检测仪

    Institute of Scientific and Technical Information of China (English)

    程刚; 王肖剑

    2012-01-01

    过电压在线检测仪主要用于变电站过电压在线检测,能自动追踪、并以较高的采样速率和采样深度记录内外过电压的波形、幅值及相关信息,并可查询已保存的过电压历史数据,同时实现对波形的多种操作;过电压在线检测仪采用电容分压器和NI公司的图形化编程软件LabVIEW等组成;经过运行证明该装置运行正常、稳定、可靠,能在过电压发生时完整、准确地同时记录下六路瞬态过电压信号,为更好的绝缘配合、修订绝缘水平提供有力参考.%On-Line over-voltage detector is mainly used for detection over -voltage of substation, automatic tracking, with higher sampling rate and sampling depth of the wave, both inside and outside record over voltage amplitude and related information, and inquires the historical overvoltage data, to realize the varied waveform operation. On-line over-voltage detector composed by capacitive divider and NI's Lab VIEW graphical programming software etc. The device run normally, stable and reliable, it can accurate record six channel transient overvoltage signals at the same time, it provide powerful reference for better insulation coordination and revise insulation level.

  17. Lab-scale Technology for Biogas Production from Lignocellulose Wastes

    Directory of Open Access Journals (Sweden)

    Lukáš Krátký

    2012-01-01

    Full Text Available Currently-operating biogas plants are based on the treatment of lignocellulose biomass, which is included in materials such as agriculture and forestry wastes, municipal solid wastes, waste paper, wood and herbaceous energy crops. Lab-scale biogas technology was specially developed for evaluating the anaerobic biodegrability and the specific methane yields of solid organic substrates. This technology falls into two main categories – pretreatment equipments, and fermentation equipments. Pretreatment units use physical principles based on mechanical comminution (ball mills, macerator orhydrothermal treatment (liquid hot water pretreatment technology. The biochemical methane potential test is used to evaluate the specific methane yields of treated or non-treated organic substrates. This test can be performed both by lab testing units and by lab fermenter.

  18. Hollow fiber-based liquid-liquid-liquid micro-extraction with osmosis: I. Theoretical simulation and verification.

    Science.gov (United States)

    Wu, Qian; Wu, Dapeng; Geng, Xuhui; Shen, Zheng; Guan, Yafeng

    2012-07-27

    Osmosis in hollow fiber-based liquid-liquid-liquid micro-extraction (HF-LLLME) was validated and utilized to improve enrichment factor of extraction in this study. When donor phase (sample solution) with higher ion strength than acceptor phase (extraction phase) was used, osmosis was established from acceptor phase, through organic membrane to donor phase. The mass flux expression of analytes across the organic membrane was established based on the convective-diffusive kinetic model, and the kinetic process for HF-LLLME with osmosis was simulated. Simulation results indicated that osmosis from acceptor phase to donor phase can increase enrichment factor of HF-LLLME, accelerate extraction process, and even result in the distribution ratio of analytes between donor and acceptor phase exceeding their partition coefficient. This phenomenon was verified by the experimental data of extraction with six organic acids and four organic bases as the model analytes.

  19. 基于LabVIEW的圆度误差测量分析系统研究%Roundness Error Measurement and Analysis System Study Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    万文

    2011-01-01

    In order to realize measurement analysis of roundness error, the system is studied, which adopted with virtual instrument graphic program language of LabVlEW development platform and based on roundness error for collection and analysis. The least-squares round program for evaluation of roundness error was designed. Roundness error measurement and assessment are realized.%为了实现圆度误差测量分析,采用LabVIEW作为软件开发平台,研究了基于虚拟仪器的圆度误差采集和分析系统,设计了圆度误差评定的最小二乘圆法程序,实现了圆度误差测量评定.

  20. 基于LabVIEW的嵌入式系统实验平台设计与实现%Design and realization of embedded system experimental platform based on Lab VIEW

    Institute of Scientific and Technical Information of China (English)

    齐羽

    2011-01-01

    This article describes the design and realization of embedded system experimental platform based on graphical programming language. This system uses ADI Blackfin series embedded processor as the CPU, expands a variety of peripheral modules, and is developed with LabVIEW graphical programming language.%介绍了一种基于图形化编程语言的嵌入式系统实验平台的设计,叙述了平台的开发环境、硬件的构成,并以具体实验为例详细介绍了开发与调试过程.该平台以ADI公司Blaekfin系列嵌入式处理器作为CPU,扩展多种外设模块,采用LabVIEW图形化编程语言进行开发.

  1. Lab-on-DVD: standard DVD drives as a novel laser scanning microscope for image based point of care diagnostics.

    Science.gov (United States)

    Ramachandraiah, Harisha; Amasia, Mary; Cole, Jackie; Sheard, Paul; Pickhaver, Simon; Walker, Chris; Wirta, Valtteri; Lexow, Preben; Lione, Richard; Russom, Aman

    2013-04-21

    We present a novel "Lab-on-DVD" system and demonstrate its capability for rapid and low-cost HIV diagnostics by counting CD4+ cells isolated from whole blood. We show that a commercial DVD drive can, with certain modifications, be turned into an improved DVD-based laser scanning microscope (DVD-LSM). The system consists of a multi-layered disposable polymer disc and a modified commercial DVD reader with rotational control for sample handling, temperature control for optimized bioassay, a photodiode array for detection, and software for signal processing and user interface - all the necessary components required for a truly integrated lab-on-a-chip system, with the capability to deliver high-resolution images down to 1 μm in size. Using discs modified with antibodies, we specifically captured CD4+ cells from whole blood, demonstrating single cell resolution imaging. The novel integrated DVD platform with sub-micron image resolution brings, for the first time, affordable cellular diagnostic testing to the point-of-care and should be readily applicable at resource-limited settings.

  2. A lab-on-chip cell-based biosensor for label-free sensing of water toxicants.

    Science.gov (United States)

    Liu, F; Nordin, A N; Li, F; Voiculescu, I

    2014-04-07

    This paper presents a lab-on-chip biosensor containing an enclosed fluidic cell culturing well seeded with live cells for rapid screening of toxicants in drinking water. The sensor is based on the innovative placement of the working electrode for the electrical cell-substrate impedance sensing (ECIS) technique as the top electrode of a quartz crystal microbalance (QCM) resonator. Cell damage induced by toxic water will cause a decrease in impedance, as well as an increase in the resonant frequency. For water toxicity tests, the biosensor's unique capabilities of performing two complementary measurements simultaneously (impedance and mass-sensing) will increase the accuracy of detection while decreasing the false-positive rate. Bovine aortic endothelial cells (BAECs) were used as toxicity sensing cells. The effects of the toxicants, ammonia, nicotine and aldicarb, on cells were monitored with both the QCM and the ECIS technique. The lab-on-chip was demonstrated to be sensitive to low concentrations of toxicants. The responses of BAECs to toxic samples occurred during the initial 5 to 20 minutes depending on the type of chemical and concentrations. Testing the multiparameter biosensor with aldicarb also demonstrated the hypothesis that using two different sensors to monitor the same cell monolayer provides cross validation and increases the accuracy of detection. For low concentrations of aldicarb, the variations in impedance measurements are insignificant in comparison with the shifts of resonant frequency monitored using the QCM resonator. A highly linear correlation between signal shifts and chemical concentrations was demonstrated for each toxicant.

  3. A comparison of liquid-based cytology with conventional cytology.

    Science.gov (United States)

    Celik, C; Gezginç, K; Toy, H; Findik, S; Yilmaz, O

    2008-02-01

    To evaluate the 2 methods of cytologic screening to detect abnormalities of the cervical epithelium. This study with 3 groups of women was performed at Selcuk University Meram Medical School between January 2004 and March 2006. In one group (paired sample for specimen collection) women were screened with conventional cytology; in another group (paired sample for specimen collection) they were screened with liquid-based cytology; and in the third group (split sample for specimen collection) they were screened by both methods. The rate of unsatisfactory results was lower in the liquid-based than in the conventional cytology group (6.1% vs. 2.6%; Pliquid-based method, but the difference was not statistically significant. Also, no statistically significant differences between liquid-based and conventional cytology were observed in the detection of other epithelial abnormalities (P>0.05). The liquid-based and conventional cytology methods were found to be equivalent in the detection of cervical epithelial abnormalities.

  4. Detection and quantification of the toxic microalgae Karenia brevis using lab on a chip mRNA sequence-based amplification.

    Science.gov (United States)

    Loukas, Christos-Moritz; McQuillan, Jonathan S; Laouenan, Florian; Tsaloglou, Maria-Nefeli; Ruano-Lopez, Jesus M; Mowlem, Matthew C

    2017-08-01

    Now and again, the rapid proliferation of certain species of phytoplankton can give rise to Harmful Algal Blooms, which pose a serious threat to marine life and human health. Current methods of monitoring phytoplankton are limited by poor specificity or by the requirement to return samples to a highly resourced, centralised lab. The Lab Card is a small, microfluidic cassette which, when used in tandem with a portable Lab Card Reader can be used to sensitively and specifically quantify harmful algae in the field, from nucleic acid extracts using RNA amplification; a sensitive and specific method for the enumeration of potentially any species based on their unique genetic signatures. This study reports the culmination of work to develop a Lab Card-based genetic assay to quantify the harmful algae Karenia brevis using mRNA amplification by the Nucleic Acid Sequence Based Amplification (NASBA) method. K. brevis cells were quantified by amplification of the rbcL gene transcript in nucleic acid extracts of K. brevis cell samples. A novel enzyme dehydration and preservation method was combined with a pre-existing reagent Gelification method to prepare fully preserved Lab Cards with a shelf-life of at least six weeks prior to use. Using an internal control (IC), the Lab Card-based rbcL NASBA was demonstrated for the quantification of K. brevis from cell extracts containing between 50 and 5000 cells. This is the first demonstration of quantitation of K. brevis using IC-NASBA on a Lab Card. Copyright © 2017. Published by Elsevier B.V.

  5. Design of LabVIEW®-based software for the control of sequential injection analysis instrumentation for the determination of morphine

    Science.gov (United States)

    Lenehan, Claire E.; Lewis, Simon W.

    2002-01-01

    LabVIEW®-based software for the automation of a sequential injection analysis instrument for the determination of morphine is presented. Detection was based on its chemiluminescence reaction with acidic potassium permanganate in the presence of sodium polyphosphate. The calibration function approximated linearity (range 5 × 10-10 to 5 × 10-6 M) with a line of best fit of y=1.05x+8.9164 (R2 =0.9959), where y is the log10 signal (mV) and x is the log10 morphine concentration (M). Precision, as measured by relative standard deviation, was 0.7% for five replicate analyses of morphine standard (5 × 10-8 M). The limit of detection (3σ) was determined as 5 × 10-11 M morphine. PMID:18924729

  6. Design of LabVIEW-based software for the control of sequential injection analysis instrumentation for the determination of morphine.

    Science.gov (United States)

    Lenehan, Claire E; Barnett, Neil W; Lewis, Simon W

    2002-01-01

    LabVIEW-based software for the automation of a sequential injection analysis instrument for the determination of morphine is presented. Detection was based on its chemiluminescence reaction with acidic potassium permanganate in the presence of sodium polyphosphate. The calibration function approximated linearity (range 5 x 10(-10) to 5 x 10(-6) M) with a line of best fit of y=1.05(x)+8.9164 (R(2) =0.9959), where y is the log10 signal (mV) and x is the log10 morphine concentration (M). Precision, as measured by relative standard deviation, was 0.7% for five replicate analyses of morphine standard (5 x 10(-8) M). The limit of detection (3sigma) was determined as 5 x 10(-11) M morphine.

  7. LabVIEW-based auto-timing counts virtual instrument system with ORTEC 974 Counter/Timer

    Institute of Scientific and Technical Information of China (English)

    YAN Jie; LIU Rong; LI Cheng; JIANG Li; LU Xinxin; ZHU Tonghua; WANG Mei; WEN Zhongwei; LIN Jufang

    2009-01-01

    In order to achieve the auto-timing counts measurement of nuclear radiation using ORTEC 974 Counter/Timer,an auto-timing counts virtual instrument system based on the LabVIEW virtual instrument development platform and GPIB instrument control and transmission bus protocol is designed in this paper.By introducing software timing technique,the minimum time base of factory setting improves from 0.1 s to 0.03 s.The timing counts performance and longtime stability are also discussed in detail.The automatic data recording and saving facilitates data analysis and processing.Its real-time display and statistic function is very convenient for monitoring the nuclear radiation.

  8. PC-LabView Based Control System in SAGA-LS

    CERN Document Server

    Ohgaki, Hideaki; Koda, Shigeru; Takabayashi, Yuichi; Tomimasu, Takio; Toyokawa, Hiroyuki; Yoshida, Katuhide

    2005-01-01

    A control system for SAGA Synchrotron Light Source (SAGA-LS) has been constructed. SAGA-LS is a small-medium size light source and is run by local government, which means there are a few number of staff in the laboratory. Thus the control system must be simple and robust, while inexpensive, easy to develop and maintain. The basic ideas of the system are 1) using PCs to build a low cost control system, 2) using off-shelf devices, FieldPoint (National Instrument) and PLCs, (FA-M3, Yokogawa), for robust and replaceable system, 3) using LabView for a quick in-house system development, 4) using channel access protocol between server and client to transparent from regular EPICS utilities, 5) using ActiveX CA to emulate the CA protocol. About 1,000 PVs are employed to control the magnet power supplies, the RF control sub-system, vacuum monitors, BPM data and several LCW data. The system has been operated and tuned at the beginning of the commissioning, spring 2004. MySQL database system also archives data to assist ...

  9. Developing a Standard Based Advanced Lab Course that Fulfills COM3 Requirements

    Science.gov (United States)

    Michalak, Rudi

    2015-03-01

    An advanced physics lab has been developed into a course that fulfills the requirements for a university studies program `COM3' course using Standard Teaching (ST) methods. The COM3 course is a capstone course under the new USP2015 study requirements for all majors. It replaces the WC writing requirement, typically filled in the English Dept., and adds the teaching of oral and digital communication skills. ST is a method that replaces typical assessments (homework / exam grades) with new assessments that measure certain specified learning outcomes. In combination with oral assessments and an oral final exam, the ST proves an efficient tool to implement the USP Learning Outcomes into a physics course. COM3 requires an unprecedented seven learning outcomes in a single course. Variety of learning outcomes: interdisciplinary goals, levels of writing (with drafting steps), organizational structure, standard language metrics, research and presentation deliverance skills, appropriate addressing of a variety of audiences, etc. With other assessment approaches than ST this variety would be difficult to meet in a physics course. An extended ST rubric has been developed for this course and will be presented and discussed in some detail.

  10. Multi-Level Security for Automotive–RFID Based Technology with Lab VIEW Implementation

    Directory of Open Access Journals (Sweden)

    Priya Darshini .V

    2013-03-01

    Full Text Available Security has become a prominent parameter for all the electronic gadgets. This proposed paper aims at securing the automotive and also preventing the unauthorized persons from accessing it. The technologies such as Radio Frequency Identification (RFID, thumb registration system and face recognition will be applied for the security measures. This proposed system will also be implemented in LabVIEW using Educational Laboratory Virtual Instrumentation Suite II (ELVIS. Initially, the RFID system will be authenticated .The importance of this system is that, it gets verification from the Road Transportation Office (RTO.The user will require an authentication to get proceed to the thumb registration module by which the efficiency of the thumb is enhanced using Pattern Matching Algorithm (PMA. Face recognition system is a technique which will be used after the thumb registration system. At last, this system allows the user to drive the car. For emergency, a key insertion slot will be placed in the system through which the user can insert the key. During this emergency mode of operation the camera captures the driver’s image and sends it to the owner’s mobile as Multimedia Messaging Service (MMS. The owner will provide the authentication password; this in turn allows the user to drive the vehicle. Global System for Mobile communication (GSM module is also kept inbuilt for tracking purpose. Among the different technologies proposed, RFID technique is briefly discussed in this paper.

  11. A LabVIEW® based generic CT scanner control software platform.

    Science.gov (United States)

    Dierick, M; Van Loo, D; Masschaele, B; Boone, M; Van Hoorebeke, L

    2010-01-01

    UGCT, the Centre for X-ray tomography at Ghent University (Belgium) does research on X-ray tomography and its applications. This includes the development and construction of state-of-the-art CT scanners for scientific research. Because these scanners are built for very different purposes they differ considerably in their physical implementations. However, they all share common principle functionality. In this context a generic software platform was developed using LabVIEW® in order to provide the same interface and functionality on all scanners. This article describes the concept and features of this software, and its potential for tomography in a research setting. The core concept is to rigorously separate the abstract operation of a CT scanner from its actual physical configuration. This separation is achieved by implementing a sender-listener architecture. The advantages are that the resulting software platform is generic, scalable, highly efficient, easy to develop and to extend, and that it can be deployed on future scanners with minimal effort.

  12. A Microwave-Based Chemical Factory in the Lab: From Milligram to Multigram Preparations

    Directory of Open Access Journals (Sweden)

    Laura Rinaldi

    2015-01-01

    Full Text Available Microwave technology is changing the way we design and optimize synthetic protocols and their scaling up to multigram production levels. The latest generation of dedicated microwave reactors enables operators to quickly screen reaction conditions by means of parallel tests and select the best catalyst, solvent, and conditions. Pilot scale synthetic procedures require flow-through conditions in microwave flow reactors which can be obtained by adapting classic batch protocols. Microwave-assisted chemical processes play a pivotal role in the design of sustainable multigram preparations which address the double requirement of process intensification and competitive production costs. Although most researchers are likely to be acquainted with the great potential of dielectric heating, the advantages and disadvantages of a particular device or the conditions needed to maximize efficiency and functionality are often overlooked. The double aims of the present review are to provide a panoramic snapshot of commercially available lab microwave reactors and their features as well as highlighting a few selected applications of microwave chemistry of particular relevance.

  13. Pesticide extraction from table grapes and plums using ionic liquid based dispersive liquid-liquid microextraction.

    Science.gov (United States)

    Ravelo-Pérez, Lidia M; Hernández-Borges, Javier; Herrera-Herrera, Antonio V; Rodríguez-Delgado, Miguel Angel

    2009-12-01

    Room temperature ionic liquids (RTILs) have been used as extraction solvents in dispersive liquid-liquid microextraction (DLLME) for the determination of eight multi-class pesticides (i.e. thiophanate-methyl, carbofuran, carbaryl, tebuconazole, iprodione, oxyfluorfen, hexythiazox, and fenazaquin) in table grapes and plums. The developed method involves the combination of DLLME and high-performance liquid chromatography with diode array detection. Samples were first homogenized and extracted with acetonitrile. After evaporation and reconstitution of the extract in water containing sodium chloride, a quick DLLME procedure that used the ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate ([C(6)MIM][PF(6)]) and methanol was developed. The RTIL dissolved in a very small volume of acetonitrile was directed injected in the chromatographic system. The comparison between the calibration curves obtained from standards and from spiked sample extracts (matrix-matched calibration) showed the existence of a strong matrix effect for most of the analyzed pesticides. A recovery study was also developed with five consecutive extractions of the two types of fruits spiked at three concentration levels. Mean recovery values were in the range of 72-100% for table grapes and 66-105% for plum samples (except for thiophanate-methyl and carbofuran, which were 64-75% and 58-66%, respectively). Limits of detection (LODs) were in the range 0.651-5.44 microg/kg for table grapes and 0.902-6.33 microg/kg for plums, representing LODs below the maximum residue limits (MRLs) established by the European Union in these fruits. The potential of the method was demonstrated by analyzing 12 commercial fruit samples (six of each type).

  14. Ionic liquid based dispersive liquid-liquid microextraction for the extraction of pesticides from bananas.

    Science.gov (United States)

    Ravelo-Pérez, Lidia M; Hernández-Borges, Javier; Asensio-Ramos, María; Rodríguez-Delgado, Miguel Angel

    2009-10-23

    This paper describes a dispersive liquid-liquid microextraction (DLLME) procedure using room temperature ionic liquids (RTILs) coupled to high-performance liquid chromatography with diode array detection capable of quantifying trace amounts of eight pesticides (i.e. thiophanate-methyl, carbofuran, carbaryl, tebuconazole, iprodione, oxyfluorfen, hexythiazox and fenazaquin) in bananas. Fruit samples were first homogenized and extracted (1g) with acetonitrile and after suitable evaporation and reconstitution of the extract in 10 mL of water, a DLLME procedure using 1-hexyl-3-methylimidazolium hexafluorophosphate ([C(6)MIM][PF(6)]) as extraction solvent was used. Experimental conditions affecting the DLLME procedure (sample pH, sodium chloride percentage, ionic liquid amount and volume of disperser solvent) were optimized by means of an experimental design. In order to determine the presence of a matrix effect, calibration curves for standards and fortified banana extracts (matrix matched calibration) were studied. Mean recovery values of the extraction of the pesticides from banana samples were in the range of 69-97% (except for thiophanate-methyl and carbofuran, which were 53-63%) with a relative standard deviation lower than 8.7% in all cases. Limits of detection achieved (0.320-4.66 microg/kg) were below the harmonized maximum residue limits established by the European Union (EU). The proposed method, was also applied to the analysis of this group of pesticides in nine banana samples taken from the local markets of the Canary Islands (Spain). To the best of our knowledge, this is the first application of RTILs as extraction solvents for DLLME of pesticides from samples different than water.

  15. 基于LabVIEW的电气教学虚拟实验室应用研究%Electrical Specialty Long distance Virtual Lab Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    邵晓娟; 黎炜

    2014-01-01

    LabVIEW实验室虚拟仪器工程平台是目前最为成功、应用最为广泛的虚拟仪器软件开发环境。近年来,虚拟仪器技术应用的领域逐渐扩散、发展,据统计在全球500强企业中使用了虚拟仪器技术的企业占有85%。它是实验教学的一个新的发展途径,在科研与教育领域发展空间更为广阔。本文旨在探讨将虚拟仪器技术如何应用于电气教学实验中去,弥补传统电器原理实验的不足。%The LabVIEW virtual instrument engineering laboratory is the most successful applied most widely virtual instrument software development environment.In recent years,virtual instrument technology application domain gradually spread development,according to the statistics in the global fortune 500 companies using the virtual instrument technology enterprises accounts for 85%.It is a new development way of experimental teaching,a broader development space in the field of scientific research and education.The purpose of this paper is to explore how to apply the virtual instrument technology to the electric teaching experiment,make up for the inadequacy of traditional electrical principle of the experiment.

  16. Development of bearing lubrication condition monitoring system based on LabVIEW%基于LabVIEW的轴承润滑状态监测系统开发

    Institute of Scientific and Technical Information of China (English)

    彭娅楠; 刘丽冉

    2016-01-01

    Bearing plays an important support role in rotating machinery, but the poor working environment makes the bearing become one of the most easily damaged parts. Whether the rotating machinery can be safe and stable is decided by the bearing running. At the same time, the bearings which are in the car also play an extremely important role in the drive train and running gear , it is very important for working status real-time monitoring to ensure stable operation of the vehicle and to protect the safety of the driver. In this paper, LabVIEW virtual instrument technology has developed a bearing lubrication condition monitoring system, according to the bearing status information collected by sensors in real time to accurately diagnose the bearing lubrication is a important safeguard to improve vehicle operation safety and economy.%轴承是旋转机械中一个重要的支撑部件,其恶劣的工作环境使得轴承成为最容易损坏的部件之一。旋转机械是否能够安全稳定的运行起决定性作用的就是轴承的运行状态。同时由于轴承在汽车的传动系、行驶系中也具有极其重要的作用,对轴承工作状态进行实时监测以保证车辆的稳定运行、保障驾驶员的安全性是非常重要的。文章利用虚拟仪器LabVIEW技术开发了一个轴承润滑状态监测系统,根据传感器采集的轴承状态信息,实时准确地诊断轴承润滑状态,是提高汽车运行安全性和经济性的重要保障措施。

  17. 一种基于LabVIEW控制的电压尖峰发生器%Voltage spike generator based on LabVIEW' s control

    Institute of Scientific and Technical Information of China (English)

    杨鸣强; 陈乾宏; 张超

    2013-01-01

    为实现对机载用电设备进行电压尖峰干扰测试,本文研制了一台符合RTCA-D0160E、GJB181-1986标准的电压尖峰发生器.本文采用全桥逆变电路结合LC谐振实现电压尖峰输出,推导了电路中主要元器件参数与电压尖峰的函数关系,并给出了主电路中脉冲变压器的设计方法.本文阐述了LabVIEW产生驱动信号控制电压尖峰发生器的原理与方法,并设计了驱动逻辑.实验波形验证了分析设计的正确性,完全符合RTCA-DO160E与GJB181-1986对电压尖峰波形的各项规定.%In order to implement the voltage spike interference test of airborne electrical equipment, the paper developed a voltage spike generator that meets the RTCA-DO160E and GJB181-1986 standard by combining the full-bridge inverter circuit with LC resonant and outputs voltage spikes. In the paper, the function of circuit component parameters and voltage spikes is derived, and the design method of pulse transformer in the main circuit is given. By analyzing the main circuit, the paper describes the principle and method of how the Lab VIEW generates the drive signal to control the voltage spike generator, and the switch drive logic. Finally, a voltage spike generator is built and subjected to experiment. The experimental waveform verifies the correctness of the theoretical analysis and is in full compliance with the provisions of voltage spike waveform in the RTCA of DO160E and GJB181-1986.

  18. 基于LabVIEW的牵引逆变器测试参数动态配置方法%A Method of Measurement Parameters Progeammatically Configuring for Traction Inverter Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    陈明奎; 谭利红

    2011-01-01

    研究了一种在LabVIEW环境中实现测试参数动态配置的方法,重点阐述了实现测试界面上参数动态修改的方法.该方法中运用VI引用、属性节点调用、控件引用索引、引用的特定类转换等LabVIEW高级编程技术.测试系统中加入了动态参数配置模块,扩大了软件的适用范围,有利于软件的模块化和复用.%A method of measurement parameters programmatically configuring based on LabVIEW was introduced. The technique of modifying measurement paramerter in human machine interface was discussed in detail, in which many advanced programming techniques. for example, applying VI reference, property node calling, controls references indexing, genetic referece converting to specific reference, were applied The module of measurement parameters programmatically configuring in measurement system extended the software's suitable scope and is beneficial to software's modularzation and reuse.

  19. Liquid refractive index sensor based on a 2D 10-fold photonic quasicrystal

    Science.gov (United States)

    Wang, Shuai; Sun, XiaoHong; Wang, Cong; Peng, Gangding; Qi, Yongle; Wang, XiShi

    2017-09-01

    A liquid refractive index sensor is designed and optimized by using silicon-rods based on a 10-fold photonic quasicrystal without defects. The resonant mode with high Q value is chosen as the sensing wavelength in the transmission spectrum. By changing the radius of the silicon pillars, the sensor size and the refractive index of the background media, different types of sensors are designed and investigated. On the other hand, the performance of the sensor is investigated including the measurement range, sensitivity, etc. In the detection limit of spectral instruments, 0.02 nm, the sensing accuracy is 10-4 refractive index unit with a figure of merit of 1478. The measurement range is from 1.2731 to 1.4185. This will provide a new method for the design and fabrication of lab-on-chip, microfluidic optical elements and integrated optical circuits.

  20. 基于LabVIEW的微波热声信号采集及消噪处理%Acquisition and De-noising of Microwave-induced Thermo-acoustic Signals Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    王华; 焦腾; 张杨; 于霄; 路国华; 吕昊; 张华; 薛慧君

    2012-01-01

    Objective To design a method of multi -channel massive data-recording and de-nosing of thermo-acoustic signals with strong background noise for microwave-induced thermo-acoustic tomography. Methods A program based on LabVIEW was used to resolve the data acquisition and preservation problem. The digital filtering was realized through the mix programming of LabVIEW and C language in order to do the de -noising simulation experiments of the strong background noise in the thermo-acoustic signals. Results The average digital filtering could eliminate efficiently the noise in the microwave-induced thermo-acoustic signals and improve the signal to noise ratio(SNR). Conclusion The de-noising method can be used efficiently for the extraction and elimination of most periodic weak signals. [Chinese M6dicdl Equipment Journal,2012,33(6): 8-10]%目的:研究微波热声成像中多通道的大数据量热声信号的采集保存和消除背景噪声的方法.方法:基于LabVIEW软件编程实现数据的采集与保存,并通过LabVIEW和C语言混合编程实现数字滤波,对热声信号中的强背景噪声进行消噪处理仿真实验.结果:数字平均滤波能够有效消除微波热声信号中的噪声,提高信噪比.结论:该方法可以有效地用于绝大部分具有周期特性的微弱信号提取和消噪处理.

  1. Design of Management System of Electronic Analytical Balance Based on Lab VIEW%基于LabVIEW的电子分析天平管理系统设计

    Institute of Scientific and Technical Information of China (English)

    王宝; 唐求; 滕召胜; 陈良柱; 张章

    2011-01-01

    针对传统的电子天平测数据记录繁琐,测量数据的可操作性差,设计一种基于LabVIEW的高精度电子分析天平管理系统,介绍了利用超低功耗单片机MSP430F449为核心处理器,CS5532为AD转换器的高精度电子分析天平的硬件结构及工作原理,详细阐述了LabVIEW通过VISA通信的软件流程和部分模块结构的实现方法,并对系统的上位机软件安全性做了简要介绍.实测结果表明,该管理系统安全可靠,操作简便,成本低廉,有很强的数据处理能力.%For the trouble data record process and poor data interoperability in traditional halance measurement equipment , this paper designed a high accuracy electronic analytical balance manage system based on LabVIEW,which was equipped with super low power MSP430F449 for information processing and CS5532 for A/D convertion. The software process and implemetation method in which LabVIEW controlled the inscniment by VISA was elaborated, and the design of some block was briefly introduced. The manage system is proved to be accurate and reliable,and easy to operate with strong; data processing; ability.

  2. 基于LabVIEW仿真实现TSP问题的模拟退火算法%Simulated annealing based on LabVIEW simulation for solving traveling salesman problem

    Institute of Scientific and Technical Information of China (English)

    赵敬和; 谢玲

    2011-01-01

    针对旅行商问题(TSP)具有的易于描述却难以处理的NP完全难题、其可能的路径数目与城市数目是呈指数型增长的、求解困难的特点。本文首次采用LabVIEW仿真实现模拟退火算法来求解该问题。仿真结果表明LabVIEW独有的数组运算规则可有效的实现该算法求解TSP问题,相比较其它方法,该方法更简单、实用、计算精度高、速度快,并且适合任意城市数目的TSP问题。%For the NP-complete hard problem which is easy to be described,but hard to be solved and the possible amounts of path increase exponentially with the amounts of city in Traveling Salesman Problem ,both resulting TSP is difficult to solve,this paper uses Simulated Annealing based on LabVIEW simulation to solve the problem for the first time. LabVIEW simulation results show that its unique array algorithms can effectively implement the Simulated annealing for TSP.Compared to other methods,this method is more simple,more practical and more precise.In addition, it has higher speed and is suitable for the TSP with any number of cities.

  3. Application of network communication in simulation systems based on LabVIEW virtual instrument%网络通信在基于LabVIEW虚拟仪器仿真系统中的应用

    Institute of Scientific and Technical Information of China (English)

    刘艳莉; 金文; 陈志敏; 刘宏军; 程泽

    2011-01-01

    The network communication function of virtual Instruments LabVIEW simulation software supplies the experimental teaching with open teaching and learning environment , which is a combination of personalized learning and interactive sharing of resources in practice. With the combination of database technology and software programming techniques and based on LabVIEW, the virtual instrument simulation of electrical and electronic systems can achieve the organization and process management of the groups of students’ experiments in a virtual laboratory, as well as educate innovation and self-design capability of students. At the same time, it can help students solve the practical problems encountered in the experiment through an online interactive features.%虚拟仪器仿真软件LabVIEW所具有的网络通信功能,为实验教学提供了个性化学习与交互式资源共享相结合的开放式实践教学环境.结合数据库技术和软件编程技术所开发的基于LabVIEW"电工电子虚拟仪器仿真系统",在培养学生的创新意识和自主设计能力的同时,可实现虚拟实验室多组学生实验的组织和过程管理,并通过在线交互功能帮助学生解决实验中遇到的实际问题.

  4. Research of Vehicle ABS Test System Based on LabVIEW%基于LabVIEW的汽车ABS试验台检测系统的研究

    Institute of Scientific and Technical Information of China (English)

    姜山; 龙永红; 黄晓峰

    2013-01-01

    ABS(防抱死制动系统)能够极大的提高车辆在制动时的稳定性和可操作性.在深入学习了ABS的工作原理及其测试技术的基础之上设计了一套台架测试装置,它能够很好的模拟实际车辆的制动工况,从而提高测试的准确度.上位机检测系统主要以美国NI公司的虚拟仪器软件LabVIEW8.6完成,它能够对数据进行实时的采集、处理与通信.通过上位机界面可以设置不同的路面工况和制动初始速度,从而检测ABS的动态性能.

  5. Design of monitoring and Control of Rolling Mills based on PXI and LabVIEW%基于PXI和LabVIEW的轧机监控系统设计

    Institute of Scientific and Technical Information of China (English)

    柏春飞; 李彦

    2009-01-01

    随着社会经济的发展,板带产品的质量要求越来越高,对精度的要求也越来越高.很多原有的生产线都已经不能满足要求.本文就镇江鼎胜铝加工厂冷轧铝箔生产线控制系统为例,从系统的总体设计、控制策略、软硬件配置、数据信息流的处理和控制器的设计等方面阐述了如何利用NI LabVIEW RT和PXI硬件开发出基于NI可编程自动控制器fPAC)为核心的板厚监测和控制系统.该系统完成高速数据采集、逻辑控制和数据显示的功能,能进行高精度实时监测并且具有比传统PLC更快的响应时间和保证连续工作.

  6. A novel LabVIEW-based multi-channel non-invasive abdominal maternal-fetal electrocardiogram signal generator.

    Science.gov (United States)

    Martinek, Radek; Kelnar, Michal; Koudelka, Petr; Vanus, Jan; Bilik, Petr; Janku, Petr; Nazeran, Homer; Zidek, Jan

    2016-02-01

    This paper describes the design, construction, and testing of a multi-channel fetal electrocardiogram (fECG) signal generator based on LabVIEW. Special attention is paid to the fetal heart development in relation to the fetus' anatomy, physiology, and pathology. The non-invasive signal generator enables many parameters to be set, including fetal heart rate (FHR), maternal heart rate (MHR), gestational age (GA), fECG interferences (biological and technical artifacts), as well as other fECG signal characteristics. Furthermore, based on the change in the FHR and in the T wave-to-QRS complex ratio (T/QRS), the generator enables manifestations of hypoxic states (hypoxemia, hypoxia, and asphyxia) to be monitored while complying with clinical recommendations for classifications in cardiotocography (CTG) and fECG ST segment analysis (STAN). The generator can also produce synthetic signals with defined properties for 6 input leads (4 abdominal and 2 thoracic). Such signals are well suited to the testing of new and existing methods of fECG processing and are effective in suppressing maternal ECG while non-invasively monitoring abdominal fECG. They may also contribute to the development of a new diagnostic method, which may be referred to as non-invasive trans-abdominal CTG +  STAN. The functional prototype is based on virtual instrumentation using the LabVIEW developmental environment and its associated data acquisition measurement cards (DAQmx). The generator also makes it possible to create synthetic signals and measure actual fetal and maternal ECGs by means of bioelectrodes.

  7. Graphene-based liquid crystal device.

    Science.gov (United States)

    Blake, Peter; Brimicombe, Paul D; Nair, Rahul R; Booth, Tim J; Jiang, Da; Schedin, Fred; Ponomarenko, Leonid A; Morozov, Sergey V; Gleeson, Helen F; Hill, Ernie W; Geim, Andre K; Novoselov, Kostya S

    2008-06-01

    Graphene is only one atom thick, optically transparent, chemically inert, and an excellent conductor. These properties seem to make this material an excellent candidate for applications in various photonic devices that require conducting but transparent thin films. In this letter, we demonstrate liquid crystal devices with electrodes made of graphene that show excellent performance with a high contrast ratio. We also discuss the advantages of graphene compared to conventionally used metal oxides in terms of low resistivity, high transparency and chemical stability.

  8. Integrated ionic liquid-based electrofluidic circuits for pressure sensing within polydimethylsiloxane microfluidic systems.

    Science.gov (United States)

    Wu, Chueh-Yu; Liao, Wei-Hao; Tung, Yi-Chung

    2011-05-21

    This paper reports a novel pressure sensor with an electrical readout based on electrofluidic circuits constructed by ionic liquid (IL)-filled microfluidic channels. The developed pressure sensor can be seamlessly fabricated into polydimethylsiloxane (PDMS) microfluidic systems using the well-developed multilayer soft lithography (MSL) technique without additional assembly or sophisticated cleanroom microfabrication processes. Therefore, the device can be easily scaled up and is fully disposable. The pressure sensing is achieved by measuring the pressure-induced electrical resistance variation of the constructed electrofluidic resistor. In addition, an electrofluidic Wheatstone bridge circuit is designed for accurate and stable resistance measurements. The pressure sensor is characterized using pressurized nitrogen gas and various liquids which flow into the microfluidic channels. The experimental results demonstrate the great long-term stability (more than a week), temperature stability (up to 100 °C), and linear characteristics of the developed pressure sensing scheme. Consequently, the integrated microfluidic pressure sensor developed in this paper is promising for better monitoring and for characterizing the flow conditions and liquid properties inside the PDMS microfluidic systems in an easier manner for various lab on a chip applications.

  9. Microfluidic device based on a micro-hydrocyclone for particle-liquid separation.

    Science.gov (United States)

    Bhardwaj, P; Bagdi, P; Sen, A K

    2011-12-07

    This paper presents theoretical analysis, design, simulation, fabrication and test of a microfluidic device ('Micro-hydrocyclone') for separation of micron and submicron size solid particles from liquid in a particle liquid mixture. A theoretical analysis of the micro-hydrocyclone is performed to understand the physics and develop suitable design models. The structure of the proposed device is designed based on the Bradley model, as it offers lower cut-size thus making it suitable for microfluidics applications. The operational parameters are derived from the dimensional group model. The particle separation process inside the micro-hydrocyclone is simulated by solving fluid flows using Navier-Stokes equations and particle dynamics using a Lagrangian approach in a Eulerian fluid. The influence of inlet velocity and density on separation efficiency is investigated. The device is fabricated with SU-8 photoresist on a PMMA substrate using a combination of photolithography and micro-milling. Experiments are performed to demonstrate particle-liquid separation using polystyrene microbeads suspended in PBS as the feed sample. The influence of inlet velocity and particle size on particle separation efficiency is measured and compared with that obtained from simulations and a good match was found. The proposed device can be easily integrated with micro-environments thus it is suitable for lab-on-chip and microsystems development. The device may have applications in chemical analysis, materials research, point-of-care, blood sample preparation and other biomedical applications.

  10. The Research of Virtual Instruments Based on Labview%基于LabVIEW的虚拟仪器的研究

    Institute of Scientific and Technical Information of China (English)

    陈万里; 王丽霞

    2007-01-01

    LabVIEW被认为是虚拟仪器技术最有影响力和发展前景的软件平台.本文阐述了LabVIEW虚拟仪器的设计原理,详细介绍了LabVIEW的发展历程和研究进展,并举例介绍其应用现状.最后对基于LabVIEW虚拟仪器技术的前景做出展望.

  11. LDRD Final Report - In Operando Liquid Cell TEM Characterization of Nickel-Based Electrocatalyst

    Energy Technology Data Exchange (ETDEWEB)

    Nielsen, M. H. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2016-11-07

    A commercial electrochemistry stage for transmission electron microscopy (TEM) was tested to determine whether to purchase one for the microscopes at Lawrence Livermore National Lab (LLNL). Deposition of a nickel-based electrocatalyst was pursued as a material system for the purpose of testing the stage. The stage was found to be problematic with recurring issues in the electrical connections and vacuum sealing, which has thus far precluded a systematic investigation of the original material system. However, the electrochemical cells purchased through this FS will allow the Lawrence Fellow (Nielsen) to continue testing the stage. Furthermore, discussions with a second vendor, which released a similar electrochemical TEM stage during the course of this FS, have resulted in an upcoming longterm loan of their stage at Lawrence Berkeley National Lab (LBNL) for testing. In addition, low-loss electron energy-loss spectroscopy (EELS) measurements on nickel-bearing electrolyte solutions led to a broader EELS investigation of solvents and salt solutions. These measurements form the basis of a manuscript in preparation on EELS measurements of the liquid phase.

  12. Capillary-driven microfluidic paper-based analytical devices for lab on a chip screening of explosive residues in soil.

    Science.gov (United States)

    Ueland, Maiken; Blanes, Lucas; Taudte, Regina V; Stuart, Barbara H; Cole, Nerida; Willis, Peter; Roux, Claude; Doble, Philip

    2016-03-04

    A novel microfluidic paper-based analytical device (μPAD) was designed to filter, extract, and pre-concentrate explosives from soil for direct analysis by a lab on a chip (LOC) device. The explosives were extracted via immersion of wax-printed μPADs directly into methanol soil suspensions for 10min, whereby dissolved explosives travelled upwards into the μPAD circular sampling reservoir. A chad was punched from the sampling reservoir and inserted into a LOC well containing the separation buffer for direct analysis, avoiding any further extraction step. Eight target explosives were separated and identified by fluorescence quenching. The minimum detectable amounts for all eight explosives were between 1.4 and 5.6ng with recoveries ranging from 53-82% from the paper chad, and 12-40% from soil. This method provides a robust and simple extraction method for rapid identification of explosives in complex soil samples.

  13. LabVIEW 2010 Computer Vision Platform Based Virtual Instrument and Its Application for Pitting Corrosion Study.

    Science.gov (United States)

    Ramos, Rogelio; Zlatev, Roumen; Valdez, Benjamin; Stoytcheva, Margarita; Carrillo, Mónica; García, Juan-Francisco

    2013-01-01

    A virtual instrumentation (VI) system called VI localized corrosion image analyzer (LCIA) based on LabVIEW 2010 was developed allowing rapid automatic and subjective error-free determination of the pits number on large sized corroded specimens. The VI LCIA controls synchronously the digital microscope image taking and its analysis, finally resulting in a map file containing the coordinates of the detected probable pits containing zones on the investigated specimen. The pits area, traverse length, and density are also determined by the VI using binary large objects (blobs) analysis. The resulting map file can be used further by a scanning vibrating electrode technique (SVET) system for rapid (one pass) "true/false" SVET check of the probable zones only passing through the pit's centers avoiding thus the entire specimen scan. A complete SVET scan over the already proved "true" zones could determine the corrosion rate in any of the zones.

  14. [Research on the range of motion measurement system for spine based on LabVIEW image processing technology].

    Science.gov (United States)

    Li, Xiaofang; Deng, Linhong; Lu, Hu; He, Bin

    2014-08-01

    A measurement system based on the image processing technology and developed by LabVIEW was designed to quickly obtain the range of motion (ROM) of spine. NI-Vision module was used to pre-process the original images and calculate the angles of marked needles in order to get ROM data. Six human cadaveric thoracic spine segments T7-T10 were selected to carry out 6 kinds of loads, including left/right lateral bending, flexion, extension, cis/counterclockwise torsion. The system was used to measure the ROM of segment T8-T9 under the loads from 1 Nm to 5 Nm. The experimental results showed that the system is able to measure the ROM of the spine accurately and quickly, which provides a simple and reliable tool for spine biomechanics investigators.

  15. [Research on the range of motion measurement system for spine based on LabVIEW image processing technology].

    Science.gov (United States)

    Li, Xiaofang; Deng, Linhong; Lu, Hu; He, Bin

    2014-08-01

    A measurement system based on the image processing technology and developed by LabVIEW was designed to quickly obtain the range of motion (ROM) of spine. NI-Vision module was used to pre-process the original images and calculate the angles of marked needles in order to get ROM data. Six human cadaveric thoracic spine segments T7-T10 were selected to carry out 6 kinds of loads, including left/right lateral bending, flexion, extension, cis/counterclockwise torsion. The system was used to measure the ROM of segment T8-T9 under the loads from 1 Nm to 5 Nm. The experimental results showed that the system is able to measure the ROM of the spine accurately and quickly, which provides a simple and reliable tool for spine biomechanics investigators.

  16. Control and measuring system of a two-dimensional scanning nanopositioning stage based on LabVIEW

    Science.gov (United States)

    Zhang, Rui-Jun; Gao, Si-Tian; Li, Wei; Chen, Ben-Yong; Shi, Yu-Shu; Li, Qi

    2015-11-01

    A control and measuring system of two-dimensional nanopositioning stage is designed for the multiple selection and combinations control based on LabVIEW. The signal generator of the system can not only generate the commonly used control signals such as sine, square, triangle and sawtooth waves, but also generate special signals such as trapezoidal wave and step wave with DAQ data acquisition card. The step wave can be triggered by the other signals for the strict timing corresponding relation between X-Y control signals. Finally, the performance of the control system of two-dimensional nanopositioning stage is conducted by the heterodyne interferometer. The results show that the operation of the system is stable and reliable and the noise peak - valley value is superior to 2nm while the stage moving with 6nm step. The system can apply to the field requiring the precise control to the positioning stage in nano-measurement and metrology.

  17. A versatile LabVIEW and FPGA-based scanned probe microscope for in-operando electronic device characterization

    CERN Document Server

    Berger, Andrew J; Jacob, Jan; Young, Justin R; Lewis, Jim; Wenzel, Lothar; Bhallamudi, Vidya P; Johnston-Halperin, Ezekiel; Pelekhov, Denis V; Hammel, P Chris

    2014-01-01

    Understanding the complex properties of electronic and spintronic devices at the micro- and nano-scale is a topic of intense current interest as it becomes increasingly important for scientific progress and technological applications. In-operando characterization of such devices by scanned probe techniques is particularly well-suited for the microscopic study of these properties. We have developed a scanned probe microscope (SPM) which is capable of both standard force imaging (atomic, magnetic, electrostatic) and simultaneous electrical transport measurements. We utilize flexible and inexpensive FPGA (field programmable gate array) hardware and a custom software framework developed in National Instrument's LabVIEW environment to perform the various aspects of microscope operation and device measurement. The FPGA-based approach enables sensitive, real-time cantilever frequency-shift detection. Using this system, we demonstrate electrostatic force microscopy of an electrically-biased graphene FET device. The c...

  18. Development and integration of a LabVIEW-based modular architecture for automated execution of electrochemical catalyst testing.

    Science.gov (United States)

    Topalov, Angel A; Katsounaros, Ioannis; Meier, Josef C; Klemm, Sebastian O; Mayrhofer, Karl J J

    2011-11-01

    This paper describes a system for performing electrochemical catalyst testing where all hardware components are controlled simultaneously using a single LabVIEW-based software application. The software that we developed can be operated in both manual mode for exploratory investigations and automatic mode for routine measurements, by using predefined execution procedures. The latter enables the execution of high-throughput or combinatorial investigations, which decrease substantially the time and cost for catalyst testing. The software was constructed using a modular architecture which simplifies the modification or extension of the system, depending on future needs. The system was tested by performing stability tests of commercial fuel cell electrocatalysts, and the advantages of the developed system are discussed.

  19. LabVIEW 2010 Computer Vision Platform Based Virtual Instrument and Its Application for Pitting Corrosion Study

    Directory of Open Access Journals (Sweden)

    Rogelio Ramos

    2013-01-01

    Full Text Available A virtual instrumentation (VI system called VI localized corrosion image analyzer (LCIA based on LabVIEW 2010 was developed allowing rapid automatic and subjective error-free determination of the pits number on large sized corroded specimens. The VI LCIA controls synchronously the digital microscope image taking and its analysis, finally resulting in a map file containing the coordinates of the detected probable pits containing zones on the investigated specimen. The pits area, traverse length, and density are also determined by the VI using binary large objects (blobs analysis. The resulting map file can be used further by a scanning vibrating electrode technique (SVET system for rapid (one pass “true/false” SVET check of the probable zones only passing through the pit’s centers avoiding thus the entire specimen scan. A complete SVET scan over the already proved “true” zones could determine the corrosion rate in any of the zones.

  20. Lab on a chip technologies for algae detection: a review.

    Science.gov (United States)

    Schaap, Allison; Rohrlack, Thomas; Bellouard, Yves

    2012-08-01

    Over the last few decades, lab on a chip technologies have emerged as powerful tools for high-accuracy diagnosis with minute quantities of liquid and as tools for exploring cell properties in general. In this paper, we present a review of the current status of this technology in the context of algae detection and monitoring. We start with an overview of the detection methods currently used for algae monitoring, followed by a review of lab on a chip devices for algae detection and classification, and then discuss a case study based on our own research activities. We conclude with a discussion on future challenges and motivations for algae-oriented lab on a chip technologies.

  1. A LabVIEW-based electrical bioimpedance spectroscopic data interpreter (LEBISDI) for biological tissue impedance analysis and equivalent circuit modelling

    KAUST Repository

    Bera, Tushar Kanti

    2016-12-05

    Under an alternating electrical signal, biological tissues produce a complex electrical bioimpedance that is a function of tissue composition and applied signal frequencies. By studying the bioimpedance spectra of biological tissues over a wide range of frequencies, we can noninvasively probe the physiological properties of these tissues to detect possible pathological conditions. Electrical impedance spectroscopy (EIS) can provide the spectra that are needed to calculate impedance parameters within a wide range of frequencies. Before impedance parameters can be calculated and tissue information extracted, impedance spectra should be processed and analyzed by a dedicated software program. National Instruments (NI) Inc. offers LabVIEW, a fast, portable, robust, user-friendly platform for designing dataanalyzing software. We developed a LabVIEW-based electrical bioimpedance spectroscopic data interpreter (LEBISDI) to analyze the electrical impedance spectra for tissue characterization in medical, biomedical and biological applications. Here, we test, calibrate and evaluate the performance of LEBISDI on the impedance data obtained from simulation studies as well as the practical EIS experimentations conducted on electronic circuit element combinations and the biological tissue samples. We analyze the Nyquist plots obtained from the EIS measurements and compare the equivalent circuit parameters calculated by LEBISDI with the corresponding original circuit parameters to assess the accuracy of the program developed. Calibration studies show that LEBISDI not only interpreted the simulated and circuitelement data accurately, but also successfully interpreted tissues impedance data and estimated the capacitive and resistive components produced by the compositions biological cells. Finally, LEBISDI efficiently calculated and analyzed variation in bioimpedance parameters of different tissue compositions, health and temperatures. LEBISDI can also be used for human tissue

  2. Liquid crystal-based hydrophone arrays

    Science.gov (United States)

    Brodzeli, Zourab; Silvestri, Leonardo; Michie, Andrew; Chigrinov, Vladimir G.; Guo, Qi; Pozhidaev, Eugene P.; Kiselev, Alexei D.; Ladouceur, Francois

    2012-09-01

    We describe a fiber optic hydrophone array system that could be used for underwater acoustic surveillance applications (e.g. military, counter terrorist, and customs authorities in protecting ports and harbors), offshore production facilities or coastal approaches as well as various marine applications. In this paper, we propose a new approach to underwater sonar systems using the voltage-controlled liquid crystals and simple multiplexing method. The proposed method permits measurement of sound under water at multiple points along an optical fiber using the low cost components and standard single mode fiber, without complex interferometric measurement techniques, electronics or demodulation software.

  3. Droplet creator based on electrowetting-on-dielectric for lab on a chip

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Electrowetting-on-dielectric (EWOD) is to directly control the wettability of liquids on the solid surface by applying the electric potential to the microelectrode array under the dielectric layer. The prototype of the EWOD droplet creator with the sandwiched structure is used: the droplet is sandwiched between the top and bottom plates; the bottom plate consists of silicon used as the substrate of the microelectrode array, nitride silicon film deposited by low pressure chemical vapor deposition as the dielectric layer and the fluorocarbon polymer film deposited by inductively coupled plasma chemical vapor deposition as the hydrophobic layer; and the top plate is the transparent electrode covered with the hydrophobic layer. To obtain the required minimum voltage, the process and the criterion of creating droplets are analyzed. At the voltage of 35 V the deionized water droplet surrounded in silicone oil is successfully created.

  4. Measurement of Radiation Damage of Water-based Liquid Scintillator and Liquid Scintillator

    CERN Document Server

    Bignell, Lindsey J; Hans, Sunej; Jaffe, David E; Rosero, Richard; Vigdor, Steven; Viren, Brett; Worcester, Elizabeth; Yeh, Minfang; Zhang, Chao

    2015-01-01

    Liquid scintillating phantoms have been proposed as a means to perform real-time 3D dosimetry for proton therapy treatment plan verification. We have studied what effect radiation damage to the scintillator will have upon this application. We have performed measurements of the degradation of the light yield and optical attenuation length of liquid scintillator and water-based liquid scintillator after irradiation by 201 MeV proton beams that deposited doses of approximately 52 Gy, 300 Gy, and 800 Gy in the scintillator. Liquid scintillator and water-based liquid scintillator (composed of $5\\%$ scintillating phase) exhibit light yield reductions of $1.74 \\pm 0.55 \\%$ and $1.31 \\pm 0.59 \\%$ after $\\approx$ 800 Gy of proton dose, respectively. Whilst some increased optical attenuation was observed in the irradiated samples, the measured reduction to the light yield is also due to damage to the scintillation light production. Based on our results and conservative estimates of the expected dose in a clinical conte...

  5. Ultrasound-assisted ionic liquid-based homogeneous liquid-liquid microextraction high-performance liquid chromatography for determination of tanshinones in Salvia miltiorrhiza Bge. root.

    Science.gov (United States)

    Wang, Zhibing; Cao, Bocheng; Yu, Aimin; Zhang, Hanqi; Qiu, Fangping

    2015-02-01

    The ultrasound-assisted ionic liquid-based homogeneous liquid-liquid microextraction has been developed and applied to the extraction of four tanshinones, including dihydrotanshinone, tanshinone I, cryptotanshinone and tanshinone IIA in Salvia miltiorrhiza Bge. root. High performance liquid chromatography was applied to the separation and determination of the analytes. The ionic liquid was used as extraction solvent and target analytes were extracted with help of ultrasound. Then, ion-pairing agent was added into the sample solution, which resulted in the formation of water-insoluble ionic liquid in the solution. The phase separation was performed by centrifugation. The extraction, concentration and purification of target analytes were performed simultaneously. The experimental parameters, including type and volume of ionic liquid, sample amount, the size of sample particle, pH value of extraction medium, extraction temperature, extraction time, amount of ion-pairing agent and centrifuging time, were investigated and optimized. The calibration curves showed good linear relationship (r>0.9997). The limits of detection and quantification were in the range of 0.052-0.093 and 0.17-0.31 μg mL(-1), respectively. The recoveries were between 70.45% and 94.23% with relative standard deviations lower than 5.31%. The present method is free of volatile organic solvents, and represents lower expenditures of sample, extraction time and solvent, compared with UAE and HRE. There was no obvious difference in the extraction yields of active constitutions obtained by the three extraction methods.

  6. An ionic liquid based strain sensor for large displacement measurement.

    Science.gov (United States)

    Keulemans, Grim; Ceyssens, Frederik; Puers, Robert

    2017-03-01

    A robust and low cost ionic liquid based strain sensor is fabricated for high strain measurements in biomedical applications (up to 40 % and higher). A tubular 5 mm long silicone microchannel with an inner diameter of 310 µm and an outer diameter of 650 µm is filled with an ionic liquid. Three ionic liquids have been investigated: 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl) imide, ethylammonium nitrate and cholinium ethanoate. When the channel is axially stretched, geometrical deformations change the electrical impedance of the liquid channel. The sensors display a linear response and low hysteresis with an average gauge factors of 1.99 for strains up to 40 %. Additionally, to fix the sensor by surgical stitching to soft biological tissue, a sensor with tube clamps consisting of photopatternable SU-8 epoxy-based resin is proposed.

  7. Heterocyclic benzoxazole-based liquid crystals: Synthesis and mesomorphic properties

    Institute of Scientific and Technical Information of China (English)

    Sie Tiong Ha; Kok Leei Foo; Ramesh T. Subramaniam; Masato M. Ito; S. Sreehari Sastry; Siew Teng Ong

    2011-01-01

    New Schiff base liquid crystals containing benzoxazole core and alkanoyloxy chain at the end group of the molecules (Cn-1H2n-1COO-, n= 14,16,18) was synthesized. The present compounds are enantiotropic smectic A liquid crystals. It was also found that the end groups of the molecules and polar chloro substituent at the benzoxazole fragment had effect on the mesomorphic properties.

  8. Ionic liquid-based dispersive liquid-liquid microextraction for the determination of formaldehyde in wastewaters and detergents.

    Science.gov (United States)

    Arvand, Majid; Bozorgzadeh, Elahe; Shariati, Shahab; Zanjanchi, Mohammad Ali

    2012-12-01

    Spectrophotometry in combination with ionic liquid-based dispersive liquid-liquid microextraction (DLLME) was applied for the extraction and determination of formaldehyde in real samples. The method is based on the reaction of formaldehyde with methyl acetoacetate in the presence of ammonia. The variation in the absorbance of the reaction product was measured at 375 nm. An appropriate mixture of ethanol (disperser solvent) and ionic liquid, 1-hexyl-3-methylimidazoliumhexafluoro-phosphate [C(6)MIM][PF(6)] (extraction solvent) was rapidly injected into a water sample containing formaldehyde. After extraction, sedimented phase was analyzed by spectrophotometry. Under the optimum conditions, the calibration graph was linear in the range of 0.1-20 ng mL(-1) with the detection limit of 0.02 ng mL(-1) and limit of quantification of 0.08 ng mL(-1) for formaldehyde. The relative standard deviation (RSD%, n = 5) for the extraction and determination of 0.8 ng mL(-1) of formaldehyde in the aqueous samples was 2.5%. The results showed that DLLME is a very simple, rapid, sensitive, and efficient analytical method for the determination of trace amounts of formaldehyde in wastewaters and detergents, and suitable results were obtained.

  9. Photoresponsive Liquid Crystals Based on Dihydroazulene

    DEFF Research Database (Denmark)

    Petersen, Anne Ugleholdt

    . Irradiation of such a DHA in the nematic phase gave partial conversion to avinylheptafulvene (VHF), not showing any changes in the mesophase, though a higher alignmentwas obtained when this sample was irradiated in its liquid crystalline state.Photomicrographs of the DHA under crossed polarizers before...... into a nematic host material, the conversion fromDHA to VHF upon irradiation did not affect any change in the dielectric anisotropy. However, theorder parameter was strongly affected by the formation of the VHF structure. It was found that thisDHA in a nematic host absorbed light when photons were passed through...... parallel to the alignmentof the nematic phase, while when the incident angle was perpendicular, the absorbance wasdrastically reduced. These differences for parallel and perpendicular absorbances wereindistinguishable for the VHF form. The corresponding azulene systems were also studied, whichshowed good...

  10. Ionic liquid supported acid/base-catalyzed production of biodiesel.

    Science.gov (United States)

    Lapis, Alexandre A M; de Oliveira, Luciane F; Neto, Brenno A D; Dupont, Jairton

    2008-01-01

    The transesterification (alcoholysis) reaction was successfully applied to synthesize biodiesel from vegetable oils using imidazolium-based ionic liquids under multiphase acidic and basic conditions. Under basic conditions, the combination of the ionic liquid 1-n-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMINTf2), alcohols, and K2CO3 (40 mol %) results in the production of biodiesel from soybean oil in high yields (>98%) and purity. H2SO4 immobilized in BMINTf2 efficiently promotes the transesterification reaction of soybean oil and various primary and secondary alcohols. In this multiphase process the acid is almost completely retained in the ionic liquid phase, while the biodiesel forms a separate phase. The recovered ionic liquid containing the acid could be reused at least six times without any significant loss in the biodiesel yield or selectivity. In both catalytic processes (acid and base), the reactions proceed as typical multiphasic systems in which the formed biodiesel accumulates as the upper phase and the glycerol by-product is selectively captured by the alcohol-ionic liquid-acid/base phase. Classical ionic liquids such as 1-n-butyl-3-methylimidazolium tetrafluoroborate and hexafluorophosphate are not stable under these acidic or basic conditions and decompose.

  11. Liquid crystals based sensing platform-technological aspects.

    Science.gov (United States)

    Hussain, Zakir; Qazi, Farah; Ahmed, Muhammad Imran; Usman, Adil; Riaz, Asim; Abbasi, Amna Didar

    2016-11-15

    In bulk phase, liquid crystalline molecules are organized due to non-covalent interactions and due to delicate nature of the present forces; this organization can easily be disrupted by any small external stimuli. This delicate nature of force balance in liquid crystals organization forms the basis of Liquid-crystals based sensing scheme which has been exploited by many researchers for the optical visualization and sensing of many biological interactions as well as detection of number of analytes. In this review, we present not only an overview of the state of the art in liquid crystals based sensing scheme but also highlight its limitations. The approaches described below revolve around possibilities and limitations of key components of such sensing platform including bottom substrates, alignments layers, nature and type of liquid crystals, sensing compartments, various interfaces etc. This review also highlights potential materials to not only improve performance of the sensing scheme but also to bridge the gap between science and technology of liquid crystals based sensing scheme.

  12. Extraction of proteins with ionic liquid aqueous two-phase system based on guanidine ionic liquid.

    Science.gov (United States)

    Zeng, Qun; Wang, Yuzhi; Li, Na; Huang, Xiu; Ding, Xueqin; Lin, Xiao; Huang, Songyun; Liu, Xiaojie

    2013-11-15

    Eight kinds of green ionic liquids were synthesized, and an ionic liquid aqueous two-phase system (ILATPS) based on 1,1,3,3-tetramethylguandine acrylate (TMGA) guanidine ionic liquid was first time studied for the extraction of proteins. Single factor experiments proved that the extraction efficiency of bovine serum albumin (BSA) was influenced by the mass of IL, K2HPO4 and BSA, also related to the separation time and temperature. The optimum conditions were determined through orthogonal experiment by the five factors described above. The results showed that under the optimum conditions, the extraction efficiency could reach up to 99.6243%. The relative standard deviations (RSD) of extraction efficiencies in precision experiment, repeatability experiment and stability experiment were 0.8156% (n=5), 1.6173% (n=5) and 1.6292% (n=5), respectively. UV-vis and FT-IR spectra confirmed that there were no chemical interactions between BSA and ionic liquid in the extraction process, and the conformation of the protein was not changed after extraction. The conductivity, DLS and TEM were combined to investigate the microstructure of the top phase and the possible mechanism for the extraction. The results showed that hydrophobic interaction, hydrogen bonding interaction and the salt out effect played important roles in the transferring process, and the aggregation and embrace phenomenon was the main driving force for the separation. All these results proved that guanidine ionic liquid-based ATPSs have the potential to offer new possibility in the extraction of proteins.

  13. Thread Group Multithreading: Accelerating the Computation of an Agent-Based Power System Modeling and Simulation Tool -- C GridLAB-D

    Energy Technology Data Exchange (ETDEWEB)

    Jin, Shuangshuang; Chassin, David P.

    2014-01-06

    GridLAB-DTM is an open source next generation agent-based smart-grid simulator that provides unprecedented capability to model the performance of smart grid technologies. Over the past few years, GridLAB-D has been used to conduct important analyses of smart grid concepts, but it is still quite limited by its computational performance. In order to break through the performance bottleneck to meet the need for large scale power grid simulations, we develop a thread group mechanism to implement highly granular multithreaded computation in GridLAB-D. We achieve close to linear speedups on multithreading version compared against the single-thread version of the same code running on general purpose multi-core commodity for a benchmark simple house model. The performance of the multithreading code shows favorable scalability properties and resource utilization, and much shorter execution time for large-scale power grid simulations.

  14. Portable capillary electrophoresis-system for on-site food analysis with lab-on-a-chip based contactless conductivity detection

    Science.gov (United States)

    Gärtner, Claudia; Sewart, René; Klemm, Richard; Becker, Holger

    2014-06-01

    A portable analytical system for the characterization of liquid environmental samples and beverages in food control was realized. The key element is the implementation of contactless conductivity detection on lab-on-a-chip basis ensuring the system to be operated in a label free mode. Typical target molecules such as small ionic species like Li+, Na+, K+, SO4 2- or NO3-, organic acids in wine whose concentration and ratio to each other documents the wine quality, or caffeine or phosphate in coke were detected. Results from sample matrices like various beverages as water, cola, tea, wine and milk, water from heaters, environmental samples and blood will be presented.

  15. Seismic base isolation technologies for Korea advanced liquid metal reactor

    Energy Technology Data Exchange (ETDEWEB)

    Yoo, B.; Lee, J.-H.; Koo, G.-H.; Lee, H.-Y.; Kim, J.-B. [Korea Atomic Energy Research Inst., Taejon (Korea, Republic of)

    2000-06-01

    This paper describes the status and prospects of the seismic base isolation technologies for Korea Advanced Liquid Metal Reactor (KALIMER). The research and development program on the seismic base isolation for KALIMER began in 1993 by KAERI under the national long-term R and D program. The objective of this program is to enhance the seismic safety, to accomplish the economic design, and to standardize the plant design through the establishment of technologies on seismic base isolation for liquid metal reactors. In this paper, tests and analyses performed in the program are presented. (orig.)

  16. A Cochlear Implant Signal Processing Lab: Exploration of a Problem-Based Learning Exercise

    Science.gov (United States)

    Bhatti, P. T.; McClellan, J. H.

    2011-01-01

    This paper presents an introductory signal processing laboratory and examines this laboratory exercise in the context of problem-based learning (PBL). Centered in a real-world application, a cochlear implant, the exercise challenged students to demonstrate a working software-based signal processor. Partnering in groups of two or three, second-year…

  17. A Study on Learning Effect among Different Learning Styles in a Web-Based Lab of Science for Elementary School Students

    Science.gov (United States)

    Sun, Koun-tem; Lin, Yuan-cheng; Yu, Chia-jui

    2008-01-01

    The purpose of this study is to explore the learning effect related to different learning styles in a Web-based virtual science laboratory for elementary school students. The online virtual lab allows teachers to integrate information and communication technology (ICT) into science lessons. The results of this experimental teaching method…

  18. Assessing the Influence of Field- and GIS-Based Inquiry on Student Attitude and Conceptual Knowledge in an Undergraduate Ecology Lab

    Science.gov (United States)

    Simmons, M. E.; Wu, X. B.; Knight, S. L.; Lopez, R. R.

    2008-01-01

    Combining field experience with use of information technology has the potential to create a problem-based learning environment that engages learners in authentic scientific inquiry. This study, conducted over a 2-yr period, determined differences in attitudes and conceptual knowledge between students in a field lab and students with combined field…

  19. Giant Ants and Walking Plants: Using Science Fiction to Teach a Writing-Intensive, Lab-Based Biology Class for Nonmajors

    Science.gov (United States)

    Firooznia, Fardad

    2006-01-01

    This writing-intensive, lab-based, nonmajor biology course explores scientific inquiry and biological concepts through specific topics illustrated or inaccurately depicted in works of science fiction. The laboratory emphasizes the scientific method and introduces several techniques used in biological research related to the works we study.…

  20. A Study on Learning Effect among Different Learning Styles in a Web-Based Lab of Science for Elementary School Students

    Science.gov (United States)

    Sun, Koun-tem; Lin, Yuan-cheng; Yu, Chia-jui

    2008-01-01

    The purpose of this study is to explore the learning effect related to different learning styles in a Web-based virtual science laboratory for elementary school students. The online virtual lab allows teachers to integrate information and communication technology (ICT) into science lessons. The results of this experimental teaching method…

  1. Development of Gas Turbine Fast Mathematical Model Simulation Module for Software Complex «Electrodin» based on LabVIEW

    Directory of Open Access Journals (Sweden)

    Olga A. Iarmonova

    2013-01-01

    Full Text Available A fast mathematical model simulation module based on LabVIEW graphical programming environment has been developed. The module will be used for gas turbine and electrical power system co-simulation, and for testing automation of gas turbine automatic control systems.

  2. Giant Ants and Walking Plants: Using Science Fiction to Teach a Writing-Intensive, Lab-Based Biology Class for Nonmajors

    Science.gov (United States)

    Firooznia, Fardad

    2006-01-01

    This writing-intensive, lab-based, nonmajor biology course explores scientific inquiry and biological concepts through specific topics illustrated or inaccurately depicted in works of science fiction. The laboratory emphasizes the scientific method and introduces several techniques used in biological research related to the works we study.…

  3. Research on Power Quality Monitoring System and Its Data Storage Format Based on LabVIEW%基于LabVIEW的电能质量监测系统及其数据存储格式的研究*

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

      利用虚拟仪器技术,通过软硬件结合,设计了基于LabVIEW的电能质量监测系统。阐述了硬件设计方案,并重点讨论了电能质量稳态指标的分析方法,系统实现了对电能质量指标实时测量和分析、数据库存储和格式转换等功能。为了克服监测网中多数据源给电能质量数据统一管理分析带来的不便,系统采用IEEE推荐的PQDIF格式存储数据,详细介绍了LabVIEW软件生成PQDIF文件的方法。实验测试表明系统满足电网监测的需求,同时具备电网监测标准化和智能化的特点。%A power quality monitoring system based on LabVIEW is designed by using the technique of virtual instrument through the combination of hardware and software. This paper mainly discusses the hardware designing proposal and the analytical methods of steady index for power quality. It realizes the functions of real-time measurement and analysis, data storage and convertion and waveform saving. In order to overcome multi-data sources, generated by different monitor equipments of power quality monitor network, to cause inconvenience to unified management and analysis of power quality data, the system adopts the storage data in PQDIF recommended by IEEE. A detailed specification of PQDIF file and its implementing method based on LabVIEW are presented. The experiment results show that the system can satisfy the requirement of power monitoring with the characteristic of standardization and intelligent.

  4. Heat dissipation for microprocessor using multiwalled carbon nanotubes based liquid.

    Science.gov (United States)

    Hung Thang, Bui; Trinh, Pham Van; Chuc, Nguyen Van; Khoi, Phan Hong; Minh, Phan Ngoc

    2013-01-01

    Carbon nanotubes (CNTs) are one of the most valuable materials with high thermal conductivity (2000 W/m · K compared with thermal conductivity of Ag 419 W/m · K). This suggested an approach in applying the CNTs in thermal dissipation system for high power electronic devices, such as computer processor and high brightness light emitting diode (HB-LED). In this work, multiwalled carbon nanotubes (MWCNTs) based liquid was made by COOH functionalized MWCNTs dispersed in distilled water with concentration in the range between 0.2 and 1.2 gram/liter. MWCNT based liquid was used in liquid cooling system to enhance thermal dissipation for computer processor. By using distilled water in liquid cooling system, CPU's temperature decreases by about 10°C compared with using fan cooling system. By using MWCNT liquid with concentration of 1 gram/liter MWCNTs, the CPU's temperature decreases by 7°C compared with using distilled water in cooling system. Theoretically, we also showed that the presence of MWCNTs reduced thermal resistance and increased the thermal conductivity of liquid cooling system. The results have confirmed the advantages of the MWCNTs for thermal dissipation systems for the μ -processor and other high power electronic devices.

  5. Heat Dissipation for Microprocessor Using Multiwalled Carbon Nanotubes Based Liquid

    Directory of Open Access Journals (Sweden)

    Bui Hung Thang

    2013-01-01

    Full Text Available Carbon nanotubes (CNTs are one of the most valuable materials with high thermal conductivity (2000 W/m·K compared with thermal conductivity of Ag 419 W/m·K. This suggested an approach in applying the CNTs in thermal dissipation system for high power electronic devices, such as computer processor and high brightness light emitting diode (HB-LED. In this work, multiwalled carbon nanotubes (MWCNTs based liquid was made by COOH functionalized MWCNTs dispersed in distilled water with concentration in the range between 0.2 and 1.2 gram/liter. MWCNT based liquid was used in liquid cooling system to enhance thermal dissipation for computer processor. By using distilled water in liquid cooling system, CPU’s temperature decreases by about 10°C compared with using fan cooling system. By using MWCNT liquid with concentration of 1 gram/liter MWCNTs, the CPU’s temperature decreases by 7°C compared with using distilled water in cooling system. Theoretically, we also showed that the presence of MWCNTs reduced thermal resistance and increased the thermal conductivity of liquid cooling system. The results have confirmed the advantages of the MWCNTs for thermal dissipation systems for the μ-processor and other high power electronic devices.

  6. Drag &Drop, Multiphysics & Neural Net-based Lab-on-Chip Optimization Software Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The overall objective of this project is to develop a drag and drop, component library (fluidic lego) based, system simulation and optimization software for entire...

  7. Drag &Drop, Mixed-Methodology-based Lab-on-Chip Design Optimization Software Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The overall objective is to develop a ?mixed-methodology?, drag and drop, component library (fluidic-lego)-based, system design and optimization tool for complex...

  8. 基于 LabVIEW 的凸轮加工磨削力测量系统设计%Design of Camshaft Grinding Force Measuring System Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    万真武; 韩秋实; 李启光; 彭宝营

    2015-01-01

    基于PM AC的数控系统凸轮轴磨床,使用扭矩传感器与数据采集卡,搭建磨削力测量平台,并基于LabVIEW 2010平台开发了磨削力测量软件系统。本系统采用测量凸轮轴扭矩的方法,通过扭矩传感器测量磨削力,不仅测量响应速度快,而且给凸轮轴磨削的变磨削力测量带来很大的便利。%Based on PMAC NC camshaft grinding system ,a grinding force measuring platform was set up ,which used a data acquisi‐tion card and atorque sensor .And a grinding force measurement software system based on LabVIEW2010 was developed .The sys‐tem used a camshaft torque measurement method ,the grinding force was measured by torque sensor .This method is of fast re‐sponse ,but also convenient in measuring the variable camshaft grinding force .

  9. Serial Communication Between S7 -300 PLC and PC Based on LabVIEW%基于LabVIEW的S7-300PLC与PC机的串口通信

    Institute of Scientific and Technical Information of China (English)

    刘小丽; 张晓光

    2011-01-01

    Based on the requirement of industrial systems, the serial communication between PC and SIMATIC S7 - 300 PLC was designed using LabVIEW ,a graphical programming language.This paper introduced the methods of making the communication program based on 3964 ( R) protocol and realized the conununication between the upper and lower computers using VISA technology and the state machine design pattem.And it applied this method to the design af the system of conditon monitonng and fault diagnosis for mining air compressors.So the data read by PLC will be displayed and analyzed in real-time in PC.%根据工业系统设计需求,采用图形化编程语言LabVIEW设计了S7-300 PLC和PC机间的串口通信.介绍了使用3964(R)协议编写通信程序的方法,利用VISA技术和状态机设计模式,实现了上下位机的通信,并将该通信方法应用于煤矿压风机组状态监测及故障诊断系统设计中,将由PLC所读取的数据在上位机上进行实时显示及分析处理.

  10. Variable Static Pressure Control Based on LabVIEW in VAV Air-Conditioning System%基于LabVIEW的变风量空调系统变静压控制

    Institute of Scientific and Technical Information of China (English)

    程贝贝; 任庆昌

    2011-01-01

    Aiming at the current situation that system airflow control mostly used fixed static pressure control method in VAV air-conditioning project, the variable static pressure control based on LabVIEW in VAV air-conditioning system is studied in Xi' an university of architecture & technology VAV laboratory. Compared with the fixed static pressure control mode, it verified that the variable static pressure control has energy-saving potential. It achieved good results based on RBF neural network auto-tuning PID control method.%针对目前变风量空调工程中系统风量多采用定静压控制的情况,结合西安建筑科技大学变风量空调实验室为研究平台。研究了基于LabVIEW的空调系统变静压控制。经验证,与定静压控制方式相比,变静压控制具有节能潜力。采用基于RBF神经网络自整定PID的控制方法,能取得良好的效果。

  11. Design of superhigh pressure gas remote monitoring and control system based on LabVIEW%基于LabVIEW的超高压气体远程测控系统设计

    Institute of Scientific and Technical Information of China (English)

    杨俊卿; 仝继钢; 雷晓峰; 江澎

    2014-01-01

    该文基于超高压气体设备操作的安全性,结合现代科技,设计出一种基于LabVIEW的超高压气体远程测控系统。该系统克服传统的超高压气体设备控制方法的安全性难以保证、功能实现单一、数据处理简单、远程控制距离有限等缺点,能够实时监测、控制高压气体。有效地解决了现场操作人员的人身安全问题,具有操作简单、实时性好、数据管理方便等特点。%In this paper , based on security superhigh pressure gas equipment operation and com-bined with modern technology , to design a superhigh pressure gas remote monitoring and control system based on LabVIEW.The system overcomes the traditional superhigh pressure gas equipment control method security is difficult to guarantee , functions achieve is single , data processing is simple , remote control distance is limited and other shortcomings , real-time monitoring control high pressure gas .It ef-fective solution to the personal safety of operator on site .Simple, real-time, easy data management ,etc.

  12. Effect of lake water on algal biomass and microbial community structure in municipal wastewater-based lab-scale photobioreactors.

    Science.gov (United States)

    Krustok, I; Truu, J; Odlare, M; Truu, M; Ligi, T; Tiirik, K; Nehrenheim, E

    2015-08-01

    Photobioreactors are a novel environmental technology that can produce biofuels with the simultaneous removal of nutrients and pollutants from wastewaters. The aim of this study was to evaluate the effect of lake water inoculation on the production of algal biomass and phylogenetic and functional structure of the algal and bacterial communities in municipal wastewater-treating lab-scale photobioreactors. Inoculating the reactors with lake water had a significant benefit to the overall algal biomass growth and nutrient reduction in the reactors with wastewater and lake water (ratio 70/30 v/v). The metagenome-based survey showed that the most abundant algal phylum in these reactors was Chlorophyta with Scenedesmus being the most prominent genus. The most abundant bacterial phyla were Proteobacteria and Bacteroidetes with most dominant families being Sphingobacteriaceae, Cytophagaceae, Flavobacteriaceae, Comamonadaceae, Planctomycetaceae, Nocardiaceae and Nostocaceae. These photobioreactors were also effective in reducing the overall amount of pathogens in wastewater compared to reactors with wastewater/tap water mixture. Functional analysis of the photobioreactor metagenomes revealed an increase in relative abundance genes related to photosynthesis, synthesis of vitamins important for auxotrophic algae and decrease in virulence and nitrogen metabolism subsystems in lake water reactors. The results of the study indicate that adding lake water to the wastewater-based photobioreactor leads to an altered bacterial community phylogenetic and functional structure that could be linked to higher algal biomass production, as well as to enhanced nutrient and pathogen reduction in these reactors.

  13. Pretreatment of Lignocellulosic Biomass with Ionic Liquids and Ionic Liquid-Based Solvent Systems

    OpenAIRE

    Qidong Hou; Meiting Ju; Weizun Li; Le Liu; Yu Chen; Qian Yang

    2017-01-01

    Pretreatment is very important for the efficient production of value-added products from lignocellulosic biomass. However, traditional pretreatment methods have several disadvantages, including low efficiency and high pollution. This article gives an overview on the applications of ionic liquids (ILs) and IL-based solvent systems in the pretreatment of lignocellulosic biomass. It is divided into three parts: the first deals with the dissolution of biomass in ILs and IL-based solvent systems; ...

  14. Thiolene and SIFEL-based Microfluidic Platforms for Liquid-Liquid Extraction.

    Science.gov (United States)

    Goyal, Sachit; Desai, Amit V; Lewis, Robert W; Ranganathan, David R; Li, Hairong; Zeng, Dexing; Reichert, David E; Kenis, Paul J A

    2014-01-01

    Microfluidic platforms provide several advantages for liquid-liquid extraction (LLE) processes over conventional methods, for example with respect to lower consumption of solvents and enhanced extraction efficiencies due to the inherent shorter diffusional distances. Here, we report the development of polymer-based parallel-flow microfluidic platforms for LLE. To date, parallel-flow microfluidic platforms have predominantly been made out of silicon or glass due to their compatibility with most organic solvents used for LLE. Fabrication of silicon and glass-based LLE platforms typically requires extensive use of photolithography, plasma or laser-based etching, high temperature (anodic) bonding, and/or wet etching with KOH or HF solutions. In contrast, polymeric microfluidic platforms can be fabricated using less involved processes, typically photolithography in combination with replica molding, hot embossing, and/or bonding at much lower temperatures. Here we report the fabrication and testing of microfluidic LLE platforms comprised of thiolene or a perfluoropolyether-based material, SIFEL, where the choice of materials was mainly guided by the need for solvent compatibility and fabrication amenability. Suitable designs for polymer-based LLE platforms that maximize extraction efficiencies within the constraints of the fabrication methods and feasible operational conditions were obtained using analytical modeling. To optimize the performance of the polymer-based LLE platforms, we systematically studied the effect of surface functionalization and of microstructures on the stability of the liquid-liquid interface and on the ability to separate the phases. As demonstrative examples, we report (i) a thiolene-based platform to determine the lipophilicity of caffeine, and (ii) a SIFEL-based platform to extract radioactive copper from an acidic aqueous solution.

  15. The effect of inquiry-based, hands-on labs on achievement in middle school science

    Science.gov (United States)

    Miller, Donna Kaye Green

    The purpose of this quasi-experimental study was to measure the difference in science achievement between students who had been taught with an inquiry-based, hands-on pedagogical approach and those who had not. Improving student academic achievement and standardized test scores is the major objective of teachers, parents, school administrators, government entities, and students themselves. One major barrier to this academic success in Georgia, and the entire United States, has been the paucity of success in middle level science classes. Many studies have been conducted to determine the learning approaches that will best enable students to not only acquire a deeper understanding of science concepts, but to equip them to apply that new knowledge in their daily activities. Inquiry-based, hands-on learning involves students participating in activities that reflect methods of scientific investigation. The effective utilization of the inquiry-based learning approach demands inclusion of learners in a self-directed learning environment, the ability to think critically, and an understanding of how to reflect and reason scientifically. The treatment group using an inquiry-based, hands-on program did score slightly higher on the CRCT. However, the results revealed that there was not a significant difference in student achievement. This study showed that the traditionally instructed control group had slightly higher interest in science than the inquiry-based treatment group. The findings of this research study indicated that the NCLB mandates might need to be altered if there are no significant academic gains that result from the use of inquiry-based strategies.

  16. 基于LabVIEW电动汽车电气性能匹配仿真%Electrical properties matching simulation for an electric vehicle based on the LabVIEW

    Institute of Scientific and Technical Information of China (English)

    陈涛; 黄称称; 李永利; 陈东; 曾琼

    2015-01-01

    A simulation analyzation was made for electric vehicle (EV) electrical performances to match and adjust the electric parameters in the early stage of EV design. An EV electric model of electric vehicle was built by using virtual workbench LabVIEW without bench veriifcation test. The basic electrical parameters were selected about the power battery, the electric motor, and the other electrical components according to the initial design requirements. Parts of the electrical model were established in StarSim, based on these parameters. The LabVIEW Sub VI and proportional integration (PI) control was combined to simulate the actual operating environments, the transient impact, the steady state driving, and the limiting conditions driving. The results show that the electrical model is reliable and can be used to analyze and verify electric vehicle electric properties, and to ensure electric vehicle electrical safety.%为解决电动汽车(EV)电气安全问题,在EV设计初期就应选择EV的电气参数。该文仿真研究了其匹配反馈和修正。未使用台架测试验证,而是通过虚拟平台LabVIEW,建立EV电气模型。根据初期设计要求,选择动力电池﹑电机等其它电器件基本电气参数。在仿真软件StarSim中,建立电气模型部件。调用LabVIEW的子软件VI,结合比例积分(PI)调节控制,来模拟实际运行环境﹑瞬态冲击﹑稳态行驶和极限工况。结果表明:该电气模型不仅可靠,而且能够对电动汽车的电气性能匹配进行分析,并反馈验证,保证了电动汽车的电气安全性。

  17. 基于 LabVIEW 的 FSAE 赛车悬架数据采集系统%Design of FSAE racing suspension data acquisition system based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    邓召文; 高伟; 王保华; 刘杰畅

    2015-01-01

    An upper computer program for Formula SAE (FSAE ) racing suspension data acquisition system based on LabVIEW is developed .The front data acquisition is completed by using single chip microcomputer ,the LabVIEW data transmission is realized through wireless module and serial com‐munication ,and the real‐time data acquisition ,recording and playback for the dynamic racing shock compression amount are realized .The wheel core jumping travel ,wheel load and frequency spectrum curve are calculated and obtained in real time .T he real‐time dynamic information reflected by racing suspension data acquisition system can be used to detect w hether the w heel travel meets the rules of FSAE and study axle load transfer of racing car under the limit conditions such as braking ,accelera‐tion and turning ,w hich can provide a guide for the car suspension performance tuning and optimiza‐tion of vehicle performance .%文章开发了一种基于LabVIEW的FSAE赛车悬架数据采集系统,利用单片机进行前端数据采集,通过无线模块、串口通讯与LabVIEW进行数据传输,实现动态赛车减震器压缩量的实时采集、记录与回放,并实时计算获得轮芯跳动行程、车轮载荷大小及频谱曲线。利用系统实时反映的动态信息,可以检测车轮行程是否满足FSAE(Formula SAE ,大学生方程式汽车大赛)规则要求,研究赛车在制动、加速以及转弯等极限工况下的轴荷转移情况,以指导赛车悬架性能调校及整车性能优化。

  18. Enhancing Project-Based Learning in Software Engineering Lab Teaching through an E-Portfolio Approach

    Science.gov (United States)

    Macias, J. A.

    2012-01-01

    Project-based learning is one of the main successful student-centered pedagogies broadly used in computing science courses. However, this approach can be insufficient when dealing with practical subjects that implicitly require many deliverables and a great deal of feedback and organizational resources. In this paper, a worked e-portfolio is…

  19. Enhancing Project-Based Learning in Software Engineering Lab Teaching through an E-Portfolio Approach

    Science.gov (United States)

    Macias, J. A.

    2012-01-01

    Project-based learning is one of the main successful student-centered pedagogies broadly used in computing science courses. However, this approach can be insufficient when dealing with practical subjects that implicitly require many deliverables and a great deal of feedback and organizational resources. In this paper, a worked e-portfolio is…

  20. Implementation of Project Based Learning in Mechatronic Lab Course at Bandung State Polytechnic

    Science.gov (United States)

    Basjaruddin, Noor Cholis; Rakhman, Edi

    2016-01-01

    Mechatronics is a multidisciplinary that includes a combination of mechanics, electronics, control systems, and computer science. The main objective of mechatronics learning is to establish a comprehensive mindset in the development of mechatronic systems. Project Based Learning (PBL) is an appropriate method for use in the learning process of…

  1. Research of Broken Wire Rope Detection System Based on LabVIEW

    Directory of Open Access Journals (Sweden)

    Jing-ge Gao

    2014-04-01

    Full Text Available In this study, we introduce how to detect broken wires in steel rope based on wavelet transform and virtual instrument technology. By means of the powerful data analysis function of virtual instrument and wavelet transform, the singularity of wires can be found and it could help to improve ability of locating broken wires and determining breakage grade.

  2. Optical detection of sepsis markers using liquid crystal based biosensors

    Science.gov (United States)

    McCamley, Maureen K.; Artenstein, Andrew W.; Opal, Steven M.; Crawford, Gregory P.

    2007-02-01

    A liquid crystal based biosensor for the detection and diagnosis of sepsis is currently in development. Sepsis, a major clinical syndrome with a significant public health burden in the US due to a large elderly population, is the systemic response of the body to a localized infection and is defined as the combination of pathologic infection and physiological changes. Bacterial infections are responsible for 90% of cases of sepsis in the US. Currently there is no bedside diagnostic available to positively identify sepsis. The basic detection scheme employed in a liquid crystal biosensor contains attributes that would find value in a clinical setting, especially for the early detection of sepsis. Utilizing the unique properties of liquid crystals, such as birefringence, a bedside diagnostic is in development which will optically report the presence of biomolecules. In a septic patient, an endotoxin known as lipopolysaccharide (LPS) is released from the outer membrane of Gram-negative bacteria and can be found in the blood stream. It is hypothesized that this long chained molecule will cause local disruptions to the open surface of a sensor containing aligned liquid crystal. The bulk liquid crystal ampli.es these local changes at the surface due to the presence of the sepsis marker, providing an optical readout through polarizing microscopy images. Liquid crystal sensors consisting of both square and circular grids, 100-200 μm in size, have been fabricated and filled with a common liquid crystal material, 5CB. Homeotropic alignment was confirmed using polarizing microscopy. The grids were then contacted with either saline only (control), or saline with varying concentrations of LPS. Changes in the con.guration of the nematic director of the liquid crystal were observed through the range of concentrations tested (5mg/mL - 1pg/mL) which have been confirmed by a consulting physician as clinically relevant levels.

  3. Smaller to larger biomolecule detection using a lab-built surface plasmon resonance based instrument

    Science.gov (United States)

    Lukose, J.; Kulal, V.; Chidangil, S.; Sinha, R. K.

    2016-10-01

    We have developed a low-cost surface plasmon resonance (SPR) instrument based on the Kretschmann configuration for biosensing applications. The fabricated instrument is capable of operating in both angular and intensity interrogation schemes. The proposed sensor has proved enormously versatile by detecting a range of analytes with low to high molecular weights. The refractive index based sensor has been used for detecting the variation in the concentration of the aqueous solution of glucose and glycerine. Real time immobilization of protein molecules, bovine serum albumin on a gold (Au) film surface, has also been detected using the SPR imaging technique. Alkanethiol functionalization of the Au surface was performed, and bovine serum albumin was immobilized onto the carboxyl functionalized surface using amine reactive cross linker chemistry. In future, the present approach can also be utilized for the selective detection of a wide range of target biomolecules with the help of specific capture probes, as well as for monitoring protein-drug interactions.

  4. Wireless Data Acquisition System Based on LabVIEW and Wi-Fi Technology%基于LabVIEW和Wi-Fi技术的无线数据采集系统

    Institute of Scientific and Technical Information of China (English)

    张志军; 徐小力; 吴国新

    2013-01-01

    针对传统有线数据采集系统存在布线、改线工程量大,维护与拓展困难且费时费力等缺陷,设计了一套基于Wi-Fi技术的无线数据采集系统.系统以LabVIEW为软件开发平台,进行虚拟仪器前面板设计与后台程序的缩写;利用Wi-Fi无线数据收发模决及其余硬件设备实现监测数据的无线采集与传输,并对整个系统进行了实验验证.%Considering the wiring shortcomings of traditional wired data acquisition systems, a Wi-Fi-based wireless data acquisition system was designed, which takes LabVIEW as the platform to design virtual instrument front panel and to write background program; making use of Wi-Fi modules and other hard equipment, the monitoring data were wirelessly collected and transported and the whole system were verified through experiments.

  5. Remote Monitor of TV ChanneI Based on LabView and Arduino%基于LabView和Arduino的电视频道无线监视系统

    Institute of Scientific and Technical Information of China (English)

    赵鑫海

    2015-01-01

    The paper designs a system which can help parents to monitor the TV programs in another house.The system uses the Ardui-no UNO hardware platform based on the ATmega328P microcontroller to process the infrared pulse signals,then achieves hexadecimal coding different infrared signals.The coded information will be sent to the computer through Bluetooth,then can distinguish the TV channel after processing by LabView,so the parents can monitor the TV channels easily.%设计了一种能帮助父母在另一个房间对电视节目进行监控的系统。系统使用基于 ATmega328P单片机的 Ardui-no UNO硬件平台处理红外脉冲信号,实现对不同红外信号的十六进制编码。蓝牙模块负责将编码后的信息发送至电脑,再由 LabView程序处理后实现电视频道的判读,从而实现对电视频道的无线监视。

  6. Design of Testing Software for Digital Conversion Device Based on LabWindows CVI%基于LabWindows/CVI的数字量变换装置测试软件设计

    Institute of Scientific and Technical Information of China (English)

    李丹佳; 陈娣; 马亚军; 邓松波

    2014-01-01

    As spacial test equipment on ground dedicated to the digital converter on arroW, digital conversion test—bench has important application value for aircraft data transmission. Digital conversion test—bench softWare systems are developed based on the LabWindoWs/CVI softWare platform. This system realizes the unit test of digital converter on the arroW and provides signal source for the testing system.%数字量变换装置测试台为箭上数字量变换器配套的地面专用测试设备,对飞行器的数据传输具有重要的应用价值。以LabWindoWs/CVI为软件平台,开发了数字量变换装置测试台的软件系统。该系统实现了对于箭上数字量变换器的单元测试以及在遥测系统进行系统测试时为被测产品提供信号源。

  7. Pretreatment of Lignocellulosic Biomass with Ionic Liquids and Ionic Liquid-Based Solvent Systems.

    Science.gov (United States)

    Hou, Qidong; Ju, Meiting; Li, Weizun; Liu, Le; Chen, Yu; Yang, Qian

    2017-03-20

    Pretreatment is very important for the efficient production of value-added products from lignocellulosic biomass. However, traditional pretreatment methods have several disadvantages, including low efficiency and high pollution. This article gives an overview on the applications of ionic liquids (ILs) and IL-based solvent systems in the pretreatment of lignocellulosic biomass. It is divided into three parts: the first deals with the dissolution of biomass in ILs and IL-based solvent systems; the second focuses on the fractionation of biomass using ILs and IL-based solvent systems as solvents; the third emphasizes the enzymatic saccharification of biomass after pretreatment with ILs and IL-based solvent systems.

  8. Centrifugal LabTube platform for fully automated DNA purification and LAMP amplification based on an integrated, low-cost heating system.

    Science.gov (United States)

    Hoehl, Melanie M; Weißert, Michael; Dannenberg, Arne; Nesch, Thomas; Paust, Nils; von Stetten, Felix; Zengerle, Roland; Slocum, Alexander H; Steigert, Juergen

    2014-06-01

    This paper introduces a disposable battery-driven heating system for loop-mediated isothermal DNA amplification (LAMP) inside a centrifugally-driven DNA purification platform (LabTube). We demonstrate LabTube-based fully automated DNA purification of as low as 100 cell-equivalents of verotoxin-producing Escherichia coli (VTEC) in water, milk and apple juice in a laboratory centrifuge, followed by integrated and automated LAMP amplification with a reduction of hands-on time from 45 to 1 min. The heating system consists of two parallel SMD thick film resistors and a NTC as heating and temperature sensing elements. They are driven by a 3 V battery and controlled by a microcontroller. The LAMP reagents are stored in the elution chamber and the amplification starts immediately after the eluate is purged into the chamber. The LabTube, including a microcontroller-based heating system, demonstrates contamination-free and automated sample-to-answer nucleic acid testing within a laboratory centrifuge. The heating system can be easily parallelized within one LabTube and it is deployable for a variety of heating and electrical applications.

  9. New type of liquid rubber and compositions based on it.

    Science.gov (United States)

    Semikolenov, S V; Nartova, A V; Voronchikhin, V D; Dubkov, K A

    2014-11-01

    The new method for producing the functionalized polymers and oligomers containing carbonyl C=O groups is developed. The method is based on the noncatalytic oxidation of unsaturated rubbers by nitrous oxide (N2O) at 180-230 °С. The proposed method allows obtaining the new type of functionalized rubbers-liquid unsaturated polyketones with regulated molecular weight and concentration of C=O groups. The influence of the liquid polyketone addition on properties of rubber-based composites is investigated. The study indicates good prospects of using the liquid polyketones for the improvement of properties and operating characteristics of the various types of rubbers and the rubber-cord systems.

  10. Lab-based limits on the Carroll-Field-Jackiw Lorentz-violating electrodynamics

    CERN Document Server

    Gomes, Y M P

    2016-01-01

    The CPT-odd and Lorentz-violating Carroll-Field-Jackiw modification of electrodynamics is discussed and we study its effects on the energy spectrum of hydrogen, as well as in the generation of a momentum-dependent electric dipole moment for charged leptons. We also briefly comment on the possibility of the detection of Lorentz violation in measurements of vacuum dichroism in resonant cavities. The bounds found are based on local laboratory experimental limits and are not competitive with the ones coming from astrophysical considerations.

  11. Lab-on-Chip Cytometry Based on Magnetoresistive Sensors for Bacteria Detection in Milk

    Directory of Open Access Journals (Sweden)

    Ana C. Fernandes

    2014-08-01

    Full Text Available Flow cytometers have been optimized for use in portable platforms, where cell separation, identification and counting can be achieved in a compact and modular format. This feature can be combined with magnetic detection, where magnetoresistive sensors can be integrated within microfluidic channels to detect magnetically labelled cells. This work describes a platform for in-flow detection of magnetically labelled cells with a magneto-resistive based cell cytometer. In particular, we present an example for the validation of the platform as a magnetic counter that identifies and quantifies Streptococcus agalactiae in milk.

  12. Update on UCO's advanced coating lab development of silver-based mirror coatings

    Science.gov (United States)

    Phillips, Andrew C.; Fryauf, David M.; Kobayashi, Nobuhiko P.; DuPraw, Brian; Cheleden, Spencer; Ratliff, Christopher; Bolte, Michael J.; Cowley, David

    2016-08-01

    We present progress in efforts underway at the University of California Observatories to develop high performance durable silver-based mirror coatings for telescope and instruments. Silver-based coatings are extremely prone to tarnish and/or corrosion, and successful coatings depend not only on the materials used but also the deposition processes employed. Our physical vapor deposition (PVD) chamber allows both sputtering and ion-assisted e-beam depositions for head-to-head comparison of deposition processes, and we present results of these comparisons. In this paper, we review the problem and discuss our recent activities and findings. We discuss a systematic study to determine which oxides, nitrides and fluorides provide the best protection in environmental tests. We present initial results into the effects of stress in our specific thin films, and thee effects of stress on mirror coating durability. We also discuss studies using Atomic Layer Deposition (ALD) over-coating of Ag, and we describe a large ALD research chamber currently under construction that will demonstrate ALD processes on larger substrates (70 cm diameter).

  13. Ionic liquid-based stable nanofluids containing gold nanoparticles.

    Science.gov (United States)

    Wang, Baogang; Wang, Xiaobo; Lou, Wenjing; Hao, Jingcheng

    2011-10-01

    A one-phase and/or two-phase method were used to prepare the stable ionic liquid-based nanofluids containing same volume fraction but different sizes or surface states of gold nanoparticles (Au NPs) and their thermal conductivities were investigated in more detail. Five significant experiment parameters, i.e. temperature, dispersion condition, particle size and surface state, and viscosity of base liquid, were evaluated to supply experimental explanations for heat transport mechanisms. The conspicuously temperature-dependent and greatly enhanced thermal conductivity under high temperatures verify that Brownian motion should be one key effect factor in the heat transport processes of ionic liquid-based gold nanofluids. While the positive influences of proper aggregation and the optimized particle size on their thermal conductivity enhancements under some specific conditions demonstrate that clustering may be another critical effect factor in heat transport processes. Moreover, the remarkable difference of the thermal conductivity enhancements of the nanofluids containing Au NPs with different surface states could be attributed to the surface state which has a strong correlation with not only Brownian motion but also clustering. Whilst the close relationship between their thermal conductivity enhancements and the viscosity of base liquid further indicate Brownian motion must occupy the leading position among various influencing factors. Finally, a promisingly synergistic effect of Brownian motion and clustering based on experimental clues and theoretical analyses was first proposed, justifying different mechanisms are sure related. The results may shed lights on comprehensive understanding of heat transport mechanisms in nanofluids.

  14. An estimated method of visibility for a remote sensing system based on LabVIEW and Arduino

    Science.gov (United States)

    Chen, Xiaochuan; Ruan, Chi; Zheng, Hairong

    2017-02-01

    Visibility data have long needed to traffic meteorological monitoring and warning system, but visibility data have monitored with expensive special equipment. Visibility degradation in fog is due to the light scattering of fog droplets, which are transit from aerosols via activation. Considering strong correlation between PM2.5 (Particulate matter with diameters less than 2.5μm) mass concentration and visibility, regression models can be useful tools for retrieving visibility data from available PM2.5 data. In this study, PM2.5 is measured by low cost and commercial equipment. The results of experiment indicate that relative humidity is the key factor to impact accuracy correlation between PM2.5 and visibility, the strongest correlation locates in the RH (Arduino as the controller, design and implements a wireless serial acquisition and control system based LabVIEW and Arduino, this system can achieve the function of real-time synchronization Web publishing. The result of the test indicates that this system has typical characteristics of friendly interface, high levels of reliability and expansibility, moreover it can retrieve visibility data from available PM2.5 data that can easy to access by low-cost sensor along the highway.

  15. Antithyroid drug detection using an enzyme cascade blocking in a nanoparticle-based lab-on-a-chip system.

    Science.gov (United States)

    Kurbanoglu, Sevinc; Mayorga-Martinez, Carmen C; Medina-Sánchez, Mariana; Rivas, Lourdes; Ozkan, Sibel A; Merkoçi, Arben

    2015-05-15

    A methimazole (MT) biosensor based on a nanocomposite of magnetic nanoparticles (MNPs) functionalized with iridium oxide nanoparticles (IrOx NPs) and tyrosinase (Tyr) immobilized onto screen printed electrode (SPE) by using a permanent magnet is presented. This system is evaluated in batch mode via chelating copper at the active site of tyrosinase and in flow mode by thioquinone formation. The MT detection in flow mode is achieved using a hybrid polydimethylsiloxane/polyester amperometric lab-on-a-chip (LOC) microsystem with an integrated SPE. Both systems are very sensitive with low limit of detection (LOD): 0.006 μM and 0.004 μM for batch and flow modes, respectively. Nevertheless, the flow mode has advantages such as its reusability, automation, low sample volume (6 μL), and fast response (20 s). Optimization and validation parameters such as enzyme-substrate amount, flow rate, inhibition conditions, repeatability and reproducibility of the biosensor have been performed. The proposed methods have been applied in MT detection in spiked human serum and pharmaceutical dosage forms.

  16. Innovative High-Throughput SAXS Methodologies Based on Photonic Lab-on-a-Chip Sensors: Application to Macromolecular Studies.

    Science.gov (United States)

    Rodríguez-Ruiz, Isaac; Radajewski, Dimitri; Charton, Sophie; Phamvan, Nhat; Brennich, Martha; Pernot, Petra; Bonneté, Françoise; Teychené, Sébastien

    2017-06-02

    The relevance of coupling droplet-based Photonic Lab-on-a-Chip (PhLoC) platforms and Small-Angle X-Ray Scattering (SAXS) technique is here highlighted for the performance of high throughput investigations, related to the study of protein macromolecular interactions. With this configuration, minute amounts of sample are required to obtain reliable statistical data. The PhLoC platforms presented in this work are designed to allow and control an effective mixing of precise amounts of proteins, crystallization reagents and buffer in nanoliter volumes, and the subsequent generation of nanodroplets by means of a two-phase flow. Spectrophotometric sensing permits a fine control on droplet generation frequency and stability as well as on concentration conditions, and finally the droplet flow is synchronized to perform synchrotron radiation SAXS measurements in individual droplets (each one acting as an isolated microreactor) to probe protein interactions. With this configuration, droplet physic-chemical conditions can be reproducibly and finely tuned, and monitored without cross-contamination, allowing for the screening of a substantial number of saturation conditions with a small amount of biological material. The setup was tested and validated using lysozyme as a model of study. By means of SAXS experiments, the proteins gyration radius and structure envelope were calculated as a function of protein concentration. The obtained values were found to be in good agreement with previously reported data, but with a dramatic reduction of sample volume requirements compared to studies reported in the literature.

  17. Research on the phase unwrapping theory of the surface roughness measurement system based on LabVIEW

    Science.gov (United States)

    Zhong, Lei; Li, Xiang-ning; Huang, Zhong-he

    2008-12-01

    The roughness of the surface is an important parameter that reflects the quality of the object. Optical methods are the usual ways to measure the surface roughness including scattering method, speckle method, interferometric method and optical stylus method. But they are highly required the precision of the mechanism and they are not convenient to realize the automatic measurement. To improve the structure and the automatic performance, this surface roughness measurement system is based on the theory of two-dimensional phase unwrapping that is widely used in aerophotogrammetry. With the theory, the three dimensional data can be calculated from the images detected. The difference is that the image is captured by radar in aerophotogrammetrytly while it is got by using optical structure in this system. The images are got through the optical structure with the structured light. To control the phase of the light, the gratings is used in the system controlled by the piezoelectric ceramics. The phase information is contained in the image and captured by the CCD camera. To analyze the images captured through the optical system, the phase should be extracted from the images through complex operation to generate the phase map. The quality-guided algorithm is the main algorithm in this system. LabVIEW is the main software development environment and the massive calculation is accomplished in the dynamic linked library complied by Visual C++ to realize the image processing. Through the stereogram showed in the software we can clearly get the three dimensional information of the surface.

  18. DAQ application of PC oscilloscope for chaos fiber-optic fence system based on LabVIEW

    Science.gov (United States)

    Lu, Manman; Fang, Nian; Wang, Lutang; Huang, Zhaoming; Sun, Xiaofei

    2011-12-01

    In order to obtain simultaneously high sample rate and large buffer in data acquisition (DAQ) for a chaos fiber-optic fence system, we developed a double-channel high-speed DAQ application of a digital oscilloscope of PicoScope 5203 based on LabVIEW. We accomplished it by creating call library function (CLF) nodes to call the DAQ functions in the two dynamic link libraries (DLLs) of PS5000.dll and PS5000wrap.dll provided by Pico Technology Company. The maximum real-time sample rate of the DAQ application can reach 1GS/s. We can control the resolutions of the application at the sample time and data amplitudes by changing their units in the block diagram, and also control the start and end times of the sampling operations. The experimental results show that the application has enough high sample rate and large buffer to meet the demanding DAQ requirements of the chaos fiber-optic fence system.

  19. Digital Controller Development Methodology Based on Real-Time Simulations with LabVIEW FPGA Hardware-Software Toolset

    Directory of Open Access Journals (Sweden)

    Tommaso Caldognetto

    2013-12-01

    Full Text Available In this paper, we exemplify the use of NI Lab-VIEW FPGA as a rapid prototyping environment for digital controllers. In our power electronics laboratory, it has been successfully employed in the development, debugging, and test of different power converter controllers for microgrid applications.The paper shows how this high level programming language,together with its target hardware platforms, including CompactRIO and Single Board RIO systems, allows researchers and students to develop even complex applications in reasonable times. The availability of efficient drivers for the considered hardware platforms frees the users from the burden of low level programming. At the same time, the high level programming approach facilitates software re-utilization, allowing the laboratory know-how to steadily grow along time. Furthermore, it allows hardware-in-the-loop real-time simulation, that proved to be effective, and safe, in debugging even complex hardware and software co-designed controllers. To illustrate the effectiveness of these hardware-software toolsets and of the methodology based upon them, two case studies are

  20. LabTrove: a lightweight, web based, laboratory "blog" as a route towards a marked up record of work in a bioscience research laboratory.

    Directory of Open Access Journals (Sweden)

    Andrew J Milsted

    Full Text Available BACKGROUND: The electronic laboratory notebook (ELN has the potential to replace the paper notebook with a marked-up digital record that can be searched and shared. However, it is a challenge to achieve these benefits without losing the usability and flexibility of traditional paper notebooks. We investigate a blog-based platform that addresses the issues associated with the development of a flexible system for recording scientific research. METHODOLOGY/PRINCIPAL FINDINGS: We chose a blog-based approach with the journal characteristics of traditional notebooks in mind, recognizing the potential for linking together procedures, materials, samples, observations, data, and analysis reports. We implemented the LabTrove blog system as a server process written in PHP, using a MySQL database to persist posts and other research objects. We incorporated a metadata framework that is both extensible and flexible while promoting consistency and structure where appropriate. Our experience thus far is that LabTrove is capable of providing a successful electronic laboratory recording system. CONCLUSIONS/SIGNIFICANCE: LabTrove implements a one-item one-post system, which enables us to uniquely identify each element of the research record, such as data, samples, and protocols. This unique association between a post and a research element affords advantages for monitoring the use of materials and samples and for inspecting research processes. The combination of the one-item one-post system, consistent metadata, and full-text search provides us with a much more effective record than a paper notebook. The LabTrove approach provides a route towards reconciling the tensions and challenges that lie ahead in working towards the long-term goals for ELNs. LabTrove, an electronic laboratory notebook (ELN system from the Smart Research Framework, based on a blog-type framework with full access control, facilitates the scientific experimental recording requirements for

  1. LabTrove: A Lightweight, Web Based, Laboratory “Blog” as a Route towards a Marked Up Record of Work in a Bioscience Research Laboratory

    Science.gov (United States)

    Milsted, Andrew J.; Hale, Jennifer R.; Frey, Jeremy G.; Neylon, Cameron

    2013-01-01

    Background The electronic laboratory notebook (ELN) has the potential to replace the paper notebook with a marked-up digital record that can be searched and shared. However, it is a challenge to achieve these benefits without losing the usability and flexibility of traditional paper notebooks. We investigate a blog-based platform that addresses the issues associated with the development of a flexible system for recording scientific research. Methodology/Principal Findings We chose a blog-based approach with the journal characteristics of traditional notebooks in mind, recognizing the potential for linking together procedures, materials, samples, observations, data, and analysis reports. We implemented the LabTrove blog system as a server process written in PHP, using a MySQL database to persist posts and other research objects. We incorporated a metadata framework that is both extensible and flexible while promoting consistency and structure where appropriate. Our experience thus far is that LabTrove is capable of providing a successful electronic laboratory recording system. Conclusions/Significance LabTrove implements a one-item one-post system, which enables us to uniquely identify each element of the research record, such as data, samples, and protocols. This unique association between a post and a research element affords advantages for monitoring the use of materials and samples and for inspecting research processes. The combination of the one-item one-post system, consistent metadata, and full-text search provides us with a much more effective record than a paper notebook. The LabTrove approach provides a route towards reconciling the tensions and challenges that lie ahead in working towards the long-term goals for ELNs. LabTrove, an electronic laboratory notebook (ELN) system from the Smart Research Framework, based on a blog-type framework with full access control, facilitates the scientific experimental recording requirements for reproducibility, reuse

  2. LabTrove: a lightweight, web based, laboratory "blog" as a route towards a marked up record of work in a bioscience research laboratory.

    Science.gov (United States)

    Milsted, Andrew J; Hale, Jennifer R; Frey, Jeremy G; Neylon, Cameron

    2013-01-01

    The electronic laboratory notebook (ELN) has the potential to replace the paper notebook with a marked-up digital record that can be searched and shared. However, it is a challenge to achieve these benefits without losing the usability and flexibility of traditional paper notebooks. We investigate a blog-based platform that addresses the issues associated with the development of a flexible system for recording scientific research. We chose a blog-based approach with the journal characteristics of traditional notebooks in mind, recognizing the potential for linking together procedures, materials, samples, observations, data, and analysis reports. We implemented the LabTrove blog system as a server process written in PHP, using a MySQL database to persist posts and other research objects. We incorporated a metadata framework that is both extensible and flexible while promoting consistency and structure where appropriate. Our experience thus far is that LabTrove is capable of providing a successful electronic laboratory recording system. LabTrove implements a one-item one-post system, which enables us to uniquely identify each element of the research record, such as data, samples, and protocols. This unique association between a post and a research element affords advantages for monitoring the use of materials and samples and for inspecting research processes. The combination of the one-item one-post system, consistent metadata, and full-text search provides us with a much more effective record than a paper notebook. The LabTrove approach provides a route towards reconciling the tensions and challenges that lie ahead in working towards the long-term goals for ELNs. LabTrove, an electronic laboratory notebook (ELN) system from the Smart Research Framework, based on a blog-type framework with full access control, facilitates the scientific experimental recording requirements for reproducibility, reuse, repurposing, and redeployment.

  3. The use of Problem Based Learning in a Simulation Lab. How does it work?

    DEFF Research Database (Denmark)

    Christiansen, Sytter

    2013-01-01

    Litterature shows lack of studies on the outcome of simulation using high and low fidelity mannequins and Problem Based Learning as a didactic tool. We have evaluated a course in undergraduate Nursing integrating different aspects of essentials in Nursing by using the Logic Model. The course...... is organized using Problembased Learning and Low Fidelity Mannequins as a didactic strategy. The overall objective is to enhance the students´ ability to critically think and reflect upon action in a clinical setting. Our study took place among 1st year students. To explore the undergraduates´ experiences we....... It also seems that students benefit from facilitators different background and ability to act. Students relate nursing to ethics and communication and not to psycomotoric skills. In general the students´experience of the course is that this is a fun and enjoyable way of learning....

  4. Person Identification System Based on Electrocardiogram Signal Using LabVIEW

    Directory of Open Access Journals (Sweden)

    Noureddine BELGACEM

    2012-06-01

    Full Text Available This paper presents a method to analyze electrocardiogram (ECG signal, extract the features, for the real time human identification. Data were obtained from short-term Lead-I ECG records (onlyone lead of forty students at Paris Est University (UPEC. Signal averaging was applied to generate ECG databases and templates for reducing the noise recorded with palm ECG signals. Time domain signalprocessing is performed, which comprises the usual steps of filtering, peak detection, heartbeat waveform segmentation, and amplitude normalization. In this paper, an ECG biometric recognition method, that needs detection of one fiducial point only is introduced, based on classification of coefficients from the Fast Fourier Transform (FFT of the Autocorrelation (AC sequence of ECG data segments. The FFT is used to reduce extracted features from ECG signals. A 100% subject recognition rate for healthy subjects can be achieved for parameters that are suitable for the database.

  5. Launching a virtual decision lab: development and field-testing of a web-based patient decision support research platform.

    Science.gov (United States)

    Hoffman, Aubri S; Llewellyn-Thomas, Hilary A; Tosteson, Anna N A; O'Connor, Annette M; Volk, Robert J; Tomek, Ivan M; Andrews, Steven B; Bartels, Stephen J

    2014-12-12

    Over 100 trials show that patient decision aids effectively improve patients' information comprehension and values-based decision making. However, gaps remain in our understanding of several fundamental and applied questions, particularly related to the design of interactive, personalized decision aids. This paper describes an interdisciplinary development process for, and early field testing of, a web-based patient decision support research platform, or virtual decision lab, to address these questions. An interdisciplinary stakeholder panel designed the web-based research platform with three components: a) an introduction to shared decision making, b) a web-based patient decision aid, and c) interactive data collection items. Iterative focus groups provided feedback on paper drafts and online prototypes. A field test assessed a) feasibility for using the research platform, in terms of recruitment, usage, and acceptability; and b) feasibility of using the web-based decision aid component, compared to performance of a videobooklet decision aid in clinical care. This interdisciplinary, theory-based, patient-centered design approach produced a prototype for field-testing in six months. Participants (n = 126) reported that: the decision aid component was easy to use (98%), information was clear (90%), the length was appropriate (100%), it was appropriately detailed (90%), and it held their interest (97%). They spent a mean of 36 minutes using the decision aid and 100% preferred using their home/library computer. Participants scored a mean of 75% correct on the Decision Quality, Knowledge Subscale, and 74 out of 100 on the Preparation for Decision Making Scale. Completing the web-based decision aid reduced mean Decisional Conflict scores from 31.1 to 19.5 (p platform that was feasible for use in research studies in terms of recruitment, acceptability, and usage. Within this platform, the web-based decision aid component performed comparably with the videobooklet

  6. Ionic Liquid-based Microwave-assisted Liquid-liquid Microextraction and High Performance Liquid Chromatography Determination of Sulfonamides from Animal Oils

    Institute of Scientific and Technical Information of China (English)

    FENG Xu-dong; LIANG Fang-hui; SU Rui; WU Li-jie; LI Xue-yuan; WANG Xing-hua; ZHANG Han-qi

    2013-01-01

    The authors performed ionic liquid-based microwave-assisted liquid-liquid microextraction(IL-based MALLME) coupled with high performance liquid chromatographic separation for the determination of 6 sulfonamides (SAs) from animal oils.The target analytes were extracted from animal oil samples with sodium hydroxide solution containing 1-butyl-3-methylimidazolium tetrafluoroborateand as the extraction solvent under microwave irradiation.The experimental parameters of the IL-based MALLME,including types of ILs,volume of IL,amount of ion-pairing agent(NH4PF6),pH value of sample solution,and extraction temperature and time were evaluated.The limits of detection and quantification obtained were in a range of 0.4-0.5 μg/kg and a range of 1.2-1.8 μg/kg,respectively.The accuracy of the method was evaluated by analyzing five spiked animal oil samples at two fortified levels(5 and 50 μg/kg),and the recoveries of SAs varied from 81.4% to 114.5% with relative standard deviations ranging from 0.8% to 9.0%.

  7. Liquid Crystalline Furandicarboxylic Acid-based Aaromatic Polyesters

    NARCIS (Netherlands)

    WILSENS, CAROLUS HENRICUS R. MARIA; RASTOGI, SANJAY; VELD, MARTIJN ARNOLDUS JOHANNES; KLOP, ENNO ANTON; NOORDOVER, BART ADRIANUS JOHANNES

    2013-01-01

    The invention pertains to a fully aromatic liquid crystalline furandicarboxylic acid- based aromatic polyester obtainable from a mixture of monomers comprising 2,5- furandicarboxylic acid, p-hydroxybenzoic acid, an aromatic diol, and 5-40 mol% of an aromatic monocarboxylic acid selected from vanilli

  8. Liquid Flow Meter based on a Thermal Anemometer Microsensor

    OpenAIRE

    Oleg Sazhin

    2016-01-01

    An analytical model of a thermal anemometer sensor is developed. A thermal anemometer microsensor utilizing doped polycrystalline silicon is created. A liquid flow meter prototype based on a thermal anemometer microsensor is designed. Results of the flow meter testing are presented.

  9. Innovations in STEM education: the Go-Lab federation of online labs

    NARCIS (Netherlands)

    Jong, de Ton; Sotiriou, Sofoklis; Gillet, Dennis

    2014-01-01

    The Go-Lab federation of online labs opens up virtual laboratories (simulation), remote laboratories (real equipment accessible at distance) and data sets from physical laboratory experiments (together called “online labs”) for large-scale use in education. In this way, Go-Lab enables inquiry-based

  10. Diffractive devices based on blue phase liquid crystals

    Science.gov (United States)

    Li, Yan; Huang, Shuaijia; Su, Yikai

    2016-09-01

    Blue phase liquid crystal (BPLC) has been attractive for display and photonic applications for its sub-millisecond response time, no need for surface alignment, and an optically isotropic dark state. Because of these advantages, diffractive devices based on blue phase liquid crystals have great potential for wide applications. In this work, we present several BPLC diffractive devices. The operation principles, fabrication and experimental measurements will be discussed in details for two BPLC gratings realized by holographic method and a BPLC Fresnel lens using a spatial light modulator projector. All of these devices exhibit several attractive features such as sub-millisecond response, relatively high spatial resolution and polarization-independence.

  11. Digital Beam Deflectors Based Partly on Liquid Crystals

    Science.gov (United States)

    Pouch, John J.; Miranda, Felix A.; Kreminska, Liubov; Pishnyak, Oleg; Golovin, Andrii; Winker, Bruce K.

    2007-01-01

    A digital beam deflector based partly on liquid crystals has been demonstrated as a prototype of a class of optical beam-steering devices that contain no mechanical actuators or solid moving parts. Such beam-steering devices could be useful in a variety of applications, including free-space optical communications, switching in fiber-optic communications, general optical switching, and optical scanning. Liquid crystals are of special interest as active materials in nonmechanical beam steerers and deflectors because of their structural flexibility, low operating voltages, and the relatively low costs of fabrication of devices that contain them.

  12. Inkjet print microchannels based on a liquid template.

    Science.gov (United States)

    Guo, Yuzhen; Li, Lihong; Li, Fengyu; Zhou, Haihua; Song, Yanlin

    2015-04-07

    A simple method to fabricate microchannels is demonstrated based on an inkjet printing liquid template. The morphology of the liquid template can be well controlled by using ink with viscosity sensitive to temperature. The as-prepared Y-shape microchannel is used as a microfluidic reactor for an acylation fluorigenic reaction in a matrix of polydimethylsiloxane (PDMS). Arbitrary modification of the microchannels could be easily realized synchronously with the formation of the microchannels. By grafting polyethylene glycol (PEG) onto the internal surface, an anti-biosorption microchannel is obtained. The facile method will be significant for the fabrication of a microfluidic chip with functional modifications.

  13. Structure-based coarse-graining in liquid slabs.

    Science.gov (United States)

    Jochum, Mara; Andrienko, Denis; Kremer, Kurt; Peter, Christine

    2012-08-14

    Structure-based coarse-graining relies on matching the pair correlation functions of a reference (atomistic) and a coarse-grained system. As such, it is designed for systems with uniform density distributions. Here, we demonstrate how it can be generalized for inhomogeneous systems by coarse-graining slabs of liquid water and methanol in vacuum, as well as a single benzene molecule at the water-vacuum interface. Our conclusion is that coarse-graining performed in inhomogeneous systems improves thermodynamic properties and the structure of interfaces without significant alterations to the local structure of the bulk liquid.

  14. Liquid base cytology in evaluation of thyroid nodules.

    Science.gov (United States)

    Keyhani, Elahe; Sharghi, Sasan A; Amini, Rana; Sharghi, Sina A; Karimlou, Masoud; Moghaddam, Fatemeh A; Larijani, Bagher

    2014-01-01

    Palpable thyroid nodules are present in 4-7% of general population and Fine Needle Aspiration (FNA) is now accepted by endocrinologists and thyroid surgeons as a safe, simple and cost effective procedure for evaluating a thyroid nodule. The obtained sample can be spread directly on slides, processed as cell block preparations or prepared as liquid base smears. Liquid base method has been recently accepted due to its shorter preparation time and better preservation of nuclear details. The aim of this study is to compare the diagnostic results of two commonly used methods: Liquid Base Preparation and Cell Block Preparation in evaluation of thyroid nodules. The samples were taken from 100 patients with a solitary nodule or a prominent nodule on a multinodular goiter background (excluding hot nodules). The obtained samples were used to prepare conventional smears (CS), Cell Block Preparations (CBP) and Liquid Base Preparations (LBP). The slides were studied by two pathologists, considering the following parameters: Cellularity, Colloid, Lymphocytes/Plasma cells and Macrophages. 87% of cases revealed informative results in LBP method while in the same group of patients only 69% of samples were informative after processing by CBP method. Sensitivity and specificity of both methods compared with the conventional smears and with each other and it is concluded that LBP is a reliable method for evaluating of a thyroid nodule. Other studies also show the same results. The liquid base method should be trusted due to its easier procedure, cleaner slide background, its higher specificity and higher diagnostic yields. It can be used instead of CBP and in association with CS to increase the accuracy of evaluation of thyroid nodules.

  15. Gamma thermometer based reactor core liquid level detector

    Science.gov (United States)

    Burns, Thomas J.

    1983-01-01

    A system is provided which employs a modified gamma thermometer for determining the liquid coolant level within a nuclear reactor core. The gamma thermometer which normally is employed to monitor local core heat generation rate (reactor power), is modified by thermocouple junctions and leads to obtain an unambiguous indication of the presence or absence of coolant liquid at the gamma thermometer location. A signal processor generates a signal based on the thermometer surface heat transfer coefficient by comparing the signals from the thermocouples at the thermometer location. The generated signal is a direct indication of loss of coolant due to the change in surface heat transfer when coolant liquid drops below the thermometer location. The loss of coolant indication is independent of reactor power at the thermometer location. Further, the same thermometer may still be used for the normal power monitoring function.

  16. 基于LabVIEW的混沌信号发生器的设计%Design of the Chaotic Signal Generator Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    赵小磊; 马珺

    2014-01-01

    介绍了一种新的方法实现对Colpitts混沌信号的产生,该系统是基于虚拟仪器平台并结合MATLAB计算模块实现对Colpitts混沌信号的产生,同时对混沌信号的自相关和功率谱进行分析。并通过USB-6009采集模块外扩高速DAC(数模转换器)芯片AD5405实现对Colpitts混沌信号的单通道输出。系统可根据用户的需求调节参数,实现不同频率混沌信号的产生。结果证明,该发生器结构简单,操作方便,运行稳定可靠,有一定参考和实用价值。%We introduces a new method that can achieve the generation of Colpitts chaotic signal The system is based on virtual instrument platform and combined with MATLAB calculation to achieve the generation of Colpitts chaotic signal and make analyse with autocorrelation and power spectrum at the same time. Signal channel output of chaotic signal was realized through USB-6009 acquisition module extending DA5405 high-speed DAC ( Digital-to-Analog Converter) chip. This system can adjust parameters according to users demand to achieve different frequency chaotic signal generation. The results demonstrate that the generator has simple structure, convenient operation, stable and reliable running,so it has some reference and practical value.

  17. 基于LabVIEW汽车操纵稳定性试验系统的开发%Study on automobile controllability and stability test system based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    孙泽海; 徐延海; 赵文杰

    2011-01-01

    基于当今对汽车操纵稳定性试验的灵活性、便捷性、可靠性和图形化的要求,结合GPS、AHRS及AM-2012转向力角测试仪的特点,开发了基于LabVIEW的汽车操纵稳定性试验测试系统.在介绍了操纵稳定性的重要性以及试验系统的要求的基础上,详细的介绍了该操纵稳定性试验系统的组成.并给出了数据采集、处理以及实时显示的软件流程以及相关关键技术的实现方法.最后进行了具体的实车道路试验,通过对试验数据进行分析,验证了该试验系统的可靠性和便捷性.%With the requirements of convenience,flexibility, re liability and graphics of the controlla-bility and stability test system, an automobile controllability and stability test system was developed based on Lab VIEW, combining the properties of GPS,AHRS and AM-2012 steering angle and power tester.Then the composition of the automobile controllability and stability test system was mainly introduced in detail based on the analysis of the importance of automobile controllability and stability and the request of the test system.Afterwards the software, flows for data acquisition, processing and real-time displaying were given, as well as the method of implementing relative key techniques were also given.Finally automobile road test is done, which results after analyzing prove that the system is reliable and convenient.

  18. 基于 LabVIEW 的输电线路故障行波分析平台%A Traveling Wave Analysis Platform for Transmission Line Faults Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    徐丽丽; 黄欣; 陈平; 姜伟昌; 王建鹏

    2016-01-01

    提出了基于虚拟仪器技术的输电线路故障行波分析平台的总体设计方案,完成了基于 LabVIEW 完成了输电线路故障行波分析平台的设计,包括接收并分析不同数据类型仿真数据、多种行波测距方法的设计、计算与分析结果的图形化显示、给出不同测距方法的数据结果、数据结果的存储与读取。仿真实例表明本平台测试结果准确、界面友好、性能稳定。%This paper presents a general design scheme of the traveling wave analysis platform for transmission line faults based on virtual instrument technology,and gives a design of the traveling wave analysis platform for transmission line faults based on LabVIEW, including the design of reception and analysis of different types of simulation data and several traveling wave fault location methods, graphical display of calculation and analysis results,data result of different location methods,as well as storage and reading of data results.Simulation results show that the platform has accurate test result,friendly interface and stable performance.

  19. 基于LabVIEW的锂电池监测系统及SOC预测研究%Lithium battery monitoring system based on LabVIEW and research on the prediction of SOC

    Institute of Scientific and Technical Information of China (English)

    陈林; 张持健; 殷安龙; 许矛盾

    2016-01-01

    In order to realize the real-time monitoring of battery parameters and the prediction of SOC. In this paper, the battery monitoring system is developed based on single chip and LabVIEW platform. With LM algorithm, build the SOC prediction model based on BP neural network and use sample data to experiment the model. Through continuous learning, the SOC predicted by BP neural network approach the actual SOC gradually. The results show that the system can display the real-time parameters of battery and store data;the prediction model realized the high nonlinear mapping between the input and the output of lithium battery, the model has high precision and is feasible.%为了实现对电池参数的实时监测和SOC的预测,中文以单片机和LabVIEW平台开发出一套电池管理系统。采用LM算法,建立了基于BP神经网络的锂电池SOC预测模型,利用样本数据进行模型实验。通过不断的学习,BP神经网络预测的SOC逐渐逼近实际的SOC。结果表明,该系统能实时显示电池参数,实现数据存储;该预测模型实现了锂电池SOC预测中输入与输出之间的高度非线性映射,预测精度高,具有可行性。

  20. 基于LabVIEW搭建光纤SPR虚拟仿真设计平台%To Build the Optic Fiber SPR Virtual Simulation Design Platform Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    汪余聪; 林鈺城

    2016-01-01

    The surface plasmon resonance (SPR) based optical fiber sensor is a novel sensor, which takes optical fiber core as a substrate to excite SPR effect. This paper demonstrates a virtual simulation platform for design of optical fiber SPR devices on the basis of LabVIEW, and makes theoretical calculations according to material parameters and component architecture, which can change the size and material parameters in situ to understand the impact on SPR effect, and furthermore to find the optimum parameters. Finally, based on side-polished PMMA plastic optical fiber, the simulation shows that 40nm silver-plated thin film on the grinding surface results in a better performance of optic fiber SPR sensor. In terms of the optimum parameters of the sensor, the relationship between the resonance wavelength and the refractive index of sampling solution can be obtained.%光纤表面等离子体共振(Surface plasmon resonance, SPR)传感器是一种将光纤纤芯作为激发SPR效应基体的新型传感器。本篇论文基于 LabVIEW 搭建虚拟仿真设计平台,依照材料参数与组件结构做理论计算,可即时改变尺寸及材料参数,了解SPR组件参数对感测效果的影响,找到最佳参数。以PMMA 塑料光纤虚拟仿真结果显示,镀银薄膜40nm于光纤研磨表面上,能够制造出一个较佳的光纤 SPR传感器;最后,以不同折射率的待测物进行仿真计算,得到共振波长与折射率关系。

  1. Pyridinium ionic liquid-based liquid-solid extraction of inorganic and organic iodine from Laminaria.

    Science.gov (United States)

    Peng, Li-Qing; Yu, Wen-Yan; Xu, Jing-Jing; Cao, Jun

    2018-01-15

    A simple, green and effective extraction method, namely, pyridinium ionic liquid- (IL) based liquid-solid extraction (LSE), was first designed to extract the main inorganic and organic iodine compounds (I(-), monoiodo-tyrosine (MIT) and diiodo-tyrosine (DIT)). The optimal extraction conditions were as follows: ultrasonic intensity 100W, IL ([EPy]Br) concentration 200mM, extraction time 30min, liquid/solid ratio 10mL/g, and pH value 6.5. The morphologies of Laminaria were studied by scanning electron microscopy and transmission electron microscopy. The recovery values of I(-), MIT and DIT from Laminaria were in the range of 88% to 94%, and limits of detection were in the range of 59.40 to 283.6ng/g. The proposed method was applied to the extraction and determination of iodine compounds in three Laminaria. The results showed that IL-based LSE could be a promising method for rapid extraction of bioactive iodine from complex food matrices. Copyright © 2017 Elsevier Ltd. All rights reserved.

  2. 基于LabVIEW和DAQ的导弹通用测试平台设计与仿真%Design and Simulation on an Improved Missile Test Platform Based on DAQ and LabVIEW

    Institute of Scientific and Technical Information of China (English)

    黄汉桥; 周军; 于晓洲

    2009-01-01

    According to the present state weapon test system for air-to-air missile, an improved test platform based on PC-DAQ and LabⅥEW is designed. The hardware is designed by the method of modularization. The signal conditioning circuit is designed particularly. The designed software mainly solves the problem of how to use CIN to transfer VC++ drives and how to use CLF to actualize the skills that compiling and applying the dynamic link library which is used for LabVIEW. By using it, the virtual graphic user interface, system control,data processing codes and data saving are given out, so the function of long-distance network detection is real-ized. In simulations, it is found that the test platform advancing the automation and general utilization of test e-quipment, and having many advantages that it is easy to operate and upgrade, which is of great importance in fully exerting the combating efficiency of the air-to-air missile.%针对空空导弹检测设备的发展现状,设计了基于LabVIEW和PC-DAQ的机载导弹通用测试平台.硬件采用模块化设计,侧重设计了信号调理电路,主要包括取有效值、过零比较、隔离放大电路和滤波等电路.软件设计主要实现了利用CIN图标调用VC++驱动程序以及利用CLF节点实现可供LabVIEW直接调用的动态库DLL文件的编制与调用等技术,完成了虚拟面板、系统控制、数据采集处理和显示存储等程序的编制,最后还实现了远程网络监控功能,可以方便地进行远程实时测试和故障诊断.仿真实验表明,所设计的测试平台提高了导弹检测设备的模块化、标准化、通用化,具有性价比高、操作简单、易于升级等优点.

  3. 基于LabVIEW的旋转机械转子振动监测系统%Vibration Monitoring System for Rotating Machine's Rotor Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    王彦兵; 李慧敏; 丁彩红

    2011-01-01

    采用传感器和信号调理技术对旋转机械转子振动的各种信号进行采集、处理,并利用LabVIEW强大的信号处理、分析和数学运算功能对信号进行显示、分析,实现了在线转子的运转状况的监测,设计出了基于LabVIEW的旋转机械转子振动的监测系统.该系统可连续测量和监视转子振动有关的各类参量:转速、轴振、轴位移等,具有直观的显示界面、强大的信号分析以及数据存储管理功能.能及时识别旋转机械设备的异常状态,保证设备安全可靠地运行,并可以为控制设备运行于最优状态以及早期诊断设备故障提供依据.%This paper used sensor and signal conditioning technology for acquiring and processing a variety of rotor vibration signals of rotating machine.It used the LahVIEW' s powerful function of signal processing,analyais and mathematical operation to display and analyze the signal, realized monitoring the work status of online rotor,designed the vibration monitoring system for rotating machine' s rotor based on LabVIEW.This system can measure and monitor various types of rotor vibration parameters in continuously,speed,rotor vibration, axial displacement, with the intuitive display interface, powerful signal analysis ability and data 0storage management functions.It can identify the abnormal states of rotating mechanical equipment to ensure the safty and reliahility of equipment operation,provide the basis to control the equipment running at an optimal condition and diagnose the early equipment fault.

  4. LabVIEW Library to EPICS Channel Access

    CERN Document Server

    Liyu, Andrei; Thompson, Dave H

    2005-01-01

    The Spallation Neutron Source (SNS) accelerator systems will deliver a 1.0 GeV, 1.4 MW proton beam to a liquid mercury target for neutron scattering research. The accelerator complex consists of a 1 GeV linear accelerator, an accumulator ring and associated transport lines. The SNS diagnostics platform is PC-based and will run Windows for its OS and LabVIEW as its programming language. Data acquisition hardware will be based on PCI cards. There will be about 300 rack-mounted computers. The Channel Access (CA) protocol of the Experimental Physics and Industrial Control System (EPICS) is the SNS control system communication standard. This paper describes the approaches, implementation, and features of LabVIEW library to CA for Windows, Linux, and Mac OS X. We also discuss how the library implements the asynchronous CA monitor routine using LabVIEW's occurrence mechanism instead of a callback function (which is not available in LabVIEW). The library is used to acquire accelerator data and applications have been ...

  5. Novel thiosalicylate-based ionic liquids for heavy metal extractions

    Energy Technology Data Exchange (ETDEWEB)

    Leyma, Raphlin; Platzer, Sonja [Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna (Austria); Jirsa, Franz [Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna (Austria); Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park, 2006, Johannesburg (South Africa); Kandioller, Wolfgang, E-mail: wolfgang.kandioller@univie.ac.at [Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna (Austria); Krachler, Regina; Keppler, Bernhard K. [Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Str. 42, A-1090 Vienna (Austria)

    2016-08-15

    Highlights: • Six thiosalicylate-based ammonium and phosphonium ionic liquids (ILs) were newly synthesized. • ILs showed good extraction of cadmium, copper, and zinc. • Phosphonium ILs showed better extraction efficiencies than their ammonium counterparts. - Abstract: This study aims to develop novel ammonium and phosphonium ionic liquids (ILs) with thiosalicylate (TS) derivatives as anions and evaluate their extracting efficiencies towards heavy metals in aqueous solutions. Six ILs were synthesized, characterized, and investigated for their extracting efficacies for cadmium, copper, and zinc. Liquid-liquid extractions of Cu, Zn, or Cd with ILs after 1–24 h using model solutions (pH 7; 0.1 M CaCl{sub 2}) were assessed using flame atomic absorption spectroscopy (F-AAS). Phosphonium-based ILs trihexyltetradecylphosphonium 2-(propylthio)benzoate [P{sub 66614}][PTB] and 2-(benzylthio)benzoate [P{sub 66614}][BTB] showed best extraction efficiency for copper and cadmium, respectively and zinc was extracted to a high degree by [P{sub 66614}][BTB] exclusively.

  6. Parallel-plate lab-on-a-chip based on digital microfluidics for on-chip electrochemical analysis

    Science.gov (United States)

    Yu, Yuhua; Chen, Jianfeng; Zhou, Jia

    2014-01-01

    This paper describes an electrowetting on dielectric (EWOD) digital microfluidic-based lab-on-a-chip (LOC) integrated with on-chip electrochemical microsensor by IC compatible fabrication process, and its application for the entire online biosensing process capable of fully automatic analysis for ferrocenemethanol (FcM) and dopamine (DA). In this work, we made full use of the parallel-plate structure of the EWOD digital microfluidic device to fabricate the microfluidic module on the bottom plate and the three-microelectrode-system-integrated electrochemical cell together with patterned ground electrode on the top plate. The proposed LOC possesses the multifunction of: (1) creating, merging and transporting of microliter-level sample droplets, (2) online biosensing, and (3) droplets recycling. The three-electrode-integrated microsensor not only reveals a sensitive electrochemical detection for FcM in a wide concentration range (10 µM-1.0 mM), but also shows good stability, selectivity and reproducibility for surface-controlled detection of DA. The calibration of DA was linear for concentration from 1.0 to 50.0 µM with a high sensitivity of 2145 nA µM-1 cm-2 (R2 = 0.9933) and estimated detection limit of 0.42 µM (signal/noise ratio of 3). This work shows the promise of state-of-the-art digital microfluidic biosensors for fully automatic online bioanalysis in a future LOC to perform on-chip biomedical protocols in vitro diagnostic assays.

  7. Research on Fault Diagnosis System of a Diesel Engine Based on Wavelet Analysis and LabVIEW Software

    Directory of Open Access Journals (Sweden)

    Eidam Ahmed Hebiel

    2014-05-01

    Full Text Available Experiment presented in this study, used vibration data obtained from a four-stroke, 295 diesel engine. Fault of the internal-combustion engine was detected by using the vibration signals of the cylinder head. The fault diagnosis system was designed and constructed for inspecting the status and fault diagnosis of a diesel engine based on discrete wavelet analysis and LabVIEW software. The cylinder-head vibration signals were captured through a piezoelectric acceleration sensor, that was attached to a surface of the cylinder head of the engine, while the engine was running at two speeds (620 and 1300 rpm and two loads (15 and 45 N•m. Data was gathered from five different conditions, associated with the cylinder head such as single cylinder shortage, double cylinders shortage, intake manifold obstruction, exhaust manifold obstruction and normal condition. After decomposing the vibration signals into some of the details and approximations coefficients with db5 mother wavelet and decomposition level 5, the energies were extracted from each frequency sub-band of healthy and unhealthy conditions as a feature of engine fault diagnosis. By doing so, normal and abnormal conditions behavior could be effectively distinguished by comparing the energy accumulations of each sub-band. The results showed that detection of fault by discrete wavelet analysis is practicable. Finally, two techniques, Back-Propagation Neural Network (BPNN and Support Victor Machine (SVM were applied to the signal that was collected from the diesel engine head. The experimental results showed that BPNN was more effective in fault diagnosis of the internal-combustion engine, with various fault conditions, than SVM.

  8. Determination of diflubenzuron and chlorbenzuron in fruits by combining acetonitrile-based extraction with dispersive liquid-liquid microextraction followed by high-performance liquid chromatography.

    Science.gov (United States)

    Ruan, Chunqiang; Zhao, Xiang; Liu, Chenglan

    2015-09-01

    In this study, a simple and low-organic-solvent-consuming method combining an acetonitrile-partitioning extraction procedure followed by "quick, easy, cheap, effective, rugged and safe" cleanup with ionic-liquid-based dispersive liquid-liquid microextraction and high-performance liquid chromatography with diode array detection was developed for the determination of diflubenzuron and chlorbenzuron in grapes and pears. Ionic-liquid-based dispersive liquid-liquid microextraction was performed using the ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate as the extractive solvent and acetonitrile extract as the dispersive solvent. The main factors influencing the efficiency of the dispersive liquid-liquid microextraction were evaluated, including the extractive solvent type and volume and the dispersive solvent volume. The validation parameters indicated the suitability of the method for routine analyses of benzoylurea insecticides in a large number of samples. The relative recoveries at three spiked levels ranged between 98.6 and 109.3% with relative standard deviations of less than 5.2%. The limit of detection was 0.005 mg/kg for the two insecticides. The proposed method was successfully used for the rapid determination of diflubenzuron and chlorbenzuron residues in real fruit samples.

  9. 基于LabVIEW实现的高频段卫星级联编码的仿真%Emulation of cascading coding for high-frequency satellite communication system based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    董智强; 徐光; 段江春; 刘祥军

    2013-01-01

    As a best emergency way,the satellite communication is widely used in many countries,and has attracted more and more people’s attention. In recent years,with the increasing demand for the satellite communication and the rapid develop-ment of satellite communication technology,the miniaturization and high frequency are the developing trend for the satellite com-munication. The satellite communication equipment works in the Ka band or higher frequency band. Based on the channel mod-els of different cascading coding in the satellite communication at ka-band,some cascading coding modes are analyzed and emu-lated with LabVIEW software. The simulation result indicates that the cascading coding mode can achieve lower BER and better performance at high- frequency band.%  卫星通信作为一种无线应急通信手段原来越受到人们的重视,近年来随着卫星技术的发展卫星通信向小型化和高频段方向不断发展,工作于Ka频段或者更高频段的卫星通信系统逐步得到发展和逐步使用。在此通过卫星通信系统中不同级联编码在Ka频段信道模型的基础上,对几种级联编码方式进行了分析研究和LabVIEW仿真。通过仿真可以得出级联码系统在高频段上可以获得更低的误码率和更好的性能。

  10. Study on remote monitoring of wind-solar hybrid power based on LabVIEW%基于LabVIEW的风光互补电源远程监测研究

    Institute of Scientific and Technical Information of China (English)

    熊欣; 陈映喜

    2012-01-01

    To monitoring supervise of Wind-Solar Hybrid Power economically and effectively,and improve power supply reliability realize, a design of remote monitoring technology based on Lab VIEW is studied in this paper. The DAQ technology of virtual instrument is used to complete the functions that the main element real-time data acquisition and display interface of hybrid power is achieve by local server,using the Web network service mode of virtual instrument,the various data of power operation is monitored by remote computer throng its browser. The experimental results show that this design is easy to realize,user-friendly control,and has good application prospect.%为了经济有效地监测管理风光互补电源系统,提高供电可靠性,本文研究了一种基于LabVIEW的远程监测设计方法.利用虚拟仪器的DAQ技术完成本地服务器对风光互补电源主要元件的实时数据采集及显示界面功能,采用虚拟仪器的Web网络服务方式,客户端计算机就能够通过浏览器对电源运行的各项数据进行远程监测.实验证明此设计易于实现,操作简便,扩展性强,具有良好的应用前景.

  11. Design of Closed-loop Control System for Electronic Throttle Valve Based on LabVIEW%基于LabVIEW的电子节气门开度闭环控制系统设计

    Institute of Scientific and Technical Information of China (English)

    蒋艳; 钱伟康; 倪元鸿

    2012-01-01

    设计了基于LabVIEW 2010平台实现对汽车电子节气门蝶阀开度的闭环控制系统.系统选用NI的高速M系列USB-6251数据采集板卡采集从节气门位置传感器反馈的电压信号,且输出两路互补PWM信号控制节气门体中的直流电机.结合PID积分分离控制算法,即当节气门蝶阀开度变化较小时采用PID算法,当角度变化较大时采用PD算法.实验证明系统编程简单,人机交互方便,开发周期短,闭环控制效果良好,具有实际的应用价值.%The paper designs the closed-loop control system for automotive electronic throttle valve opening which is based on Lab VIEW 2010 platform. System uses NI high-speed M-Series USB-6251 data acquisition board to collect feedback voltage signal from the throttle position sensor and then outputs two complementary PWM signals to control DC motor which is in throttle body. System chooses PID control algorithm with integral separation, that is to say, when the throttle valve opening change is small,system uses PID algorithm, otherwise uses PD algorithm. Experiments show that system has the advantages of simple programming, convenient human-computer interaction, short development cycles and good closed-loop control, so this research has practical value in real life.

  12. 基于LabVIEW的磁悬浮轴承的静态刚度测量系统%Measurement System of Static Stiffness for Magnetic Bearings Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    马骁; 尹成科; 陈琛

    2012-01-01

    Rotors can be suspended in stators through electromagnetic force in magnetic bearings. The static stiffness is one important technical characteristic of magnetic bearings, so it is a necessary procedure to measure static stiffness for magnetic bearings. A static stiffness measurement system was established up for active magnetic bearings in the open-loop control. This system was based on LabVIEW software development platform, and included X - Y - Z precision motorized stages, six-axis force/torque transducer,laser optical displacement sensor,and high precision ammeter for the most part. An industrial personal computer controlled every measurement cell for automatic measurement, acquisition, and data storage. It has the advantage of high automation.%磁悬浮轴承主要利用电磁力使转子悬浮于定子中,其刚度特性是磁悬浮轴承的重要技术指标,因此磁悬浮轴承的刚度测量是检验磁悬浮轴承性能的必要环节.文中建立了适用于混合控制的磁悬浮轴承在开环控制下的静态刚度测量系统.该系统利用LabVIEW软件开发测量平台,由X-Y -Z电控精密位移台、六自由度力传感器、激光位移传感器及高分辨率电流表等设备组成,并由工控机统一控制各测量单元,实现自动测量、自动采集与数据存储等功能,具有自动化程度高的优点.

  13. Design of Performance Testing System for Rudder Transmission Organ Based on LabVIEW%基于LabVIEW的舵机传动机构性能测试系统设计

    Institute of Scientific and Technical Information of China (English)

    李鹏

    2014-01-01

    A type of missile rudder performance testing system based on virtual instrument was designed in this paper . LabVIEW 2010 was used as system software development platform .The hardware of this system which including a meas-urement and control unit consisting of a PCI-6251 data acquisition card was analyzed .On this basis ,the software of this testing system consisting of a database on the remote server of a MES system was designed .Some functions were a-chieved ,such as data acquisition ,data analysis ,data storage ,data transmission and so on .This system has been used in project .it was indicated that the operation of this system is simple ,the interface of this system software is friendly ,the degree of automation is excellent ,it was also approved that this testing system meet the requirements of the project with highly practicability .%设计了一种采用虚拟仪器技术的某型导弹舵机传动机构性能测试系统。利用LabVIEW 2010作为系统开发平台,分析了PCI-6251数据采集卡组成的测控单元硬件组成,在此基础上设计了由M ES系统远程服务器数据库构成的测试系统软件。系统实现了数据采集、数据分析、数据存储和数据传输等功能。实际测试表明,此系统操作简单、界面友好、自动化程度较高,体现了测试系统的实用性。

  14. 基于LabVIEW的电火花线切割放电加工状态的研究%Research on Discharge Processing Status of WEDM Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    杨蕾; 蔡安江

    2012-01-01

    电火花线切割加工时放电加工状态决定着加工的质量和速度,电极丝和工件之间的放电电压是对放电加工过程进行实时检测的重要参数.以LabVIEW为开发平台,以放电电压为检测参数,构建了电火花线切割放电加工状态识别仿真系统.该系统主要包括线切割放电状态识别模块、BP神经网络放电预测模块以及加工稳定性分析模块,对提高电火花线切割加工质量、加工效率及智能化加工有良好的效果.%In WEDM processing,discharge machining status decided the machining quality and speed. Voltage between took and workpiece was an important parameter in the on-line monintoring of wire electrical discharge machining process. This paper took discharge voltage as detect parameters, constructed the WEDM discharge recognition simulation system based on LabVIEW. The system mainly included discharge status identification module,BP neural network discharge forecasting module and processing stability analysis module. The system has a good effect in improving quality efficiency and intelligent processing in WEDM.

  15. Design of Data Acquisition System Based on LabVIEW For Hybrid Energy Automobile%基于LabVIEW的复合能源电动汽车数据采集系统的设计

    Institute of Scientific and Technical Information of China (English)

    朱洪波; 康龙云; 杨会州

    2011-01-01

    To evaluate the performance of hybrid energy automobile and to optimize the control strategy of hy brid energy management system, a data acquisition system based on LabVIEW is designed, including data ac quisition card, sensors, signal conditioning circuit, main program. This system can achieve the functions of data acquisition, analysis, display and storage of operational parameters of hybrid energy automobile. Furthermore, to improve calculation accuracy of vehicle speed signal, a method of velocity measuring which the sampling fre quency can be adjusted according to the vehicle speed is proposed. At last, the experiment that has taken on the hybrid energy automobile indicates that the system can realize data acquisition exactly.%为了评价复合能源电动汽车的性能以及优化复合能源管理系统的控制策略,设计了一种基于LabVIEW的数据采集系统,主要包括传感器、数据采集卡、信号调理电路、系统主程序.本系统实现了对复合能源电动汽车运行参数的采集、分析、显示和存储.此外,为了提高车速信号的计算精度,提出了一种可以根据车速调整采样频率的测速方法.最后在复合能源电动车上进行了实验,结果表明,系统能够对信号进行准确采集.

  16. Infant Incubator Temperature and Humidity Detection System Based on LabVIEW%基于 LabVIEW 的婴儿培养箱温湿度检测系统

    Institute of Scientific and Technical Information of China (English)

    李军; 曾志平; 张雯; 王耀弘; 陈里里

    2014-01-01

    提出了一套基于 LabVIEW 虚拟仪器的婴儿培养箱温湿度检测系统的构建方案,完成了系统软硬件开发,根据 JJF 1260-2010婴儿培养箱校准规范和 GB 11243-2008医用设备要求,并借助于重庆市质量计量检测研究院温湿度检测标准设备完成了系统的测试与调试,得到了系统的各验证参数。实验结果表明:该系统具有较高的可靠性,能以较高精度与准确度完成婴儿培养箱的温湿度检测。%This paper presents a scheme that is used in the temperature and humidity detection system of infant incubator which is based on the LabVIEW software platform’s temperature and humidity sen-sors virtual instrument,completing the hardware and software system development. And with the help of the Quality Measurement Testing Institute of Chongqing of temperature and humidity detection standard equipment completed the testing and debugging of the system,and acquired the validation parameters of the system. Experimental results show that the system has high reliability,and is able to complete the infant incubator temperature and humidity detection with the high precision and accuracy.

  17. 基于LabVIEW的飞机地面电源监控系统设计与实现%Design and implementation of aircraft ground power supply monitoring system based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    程绪刚; 邱智; 郝世勇

    2015-01-01

    Since the complex situation and different electricity demands of aircraft from ground power supply,the ground power supply system is affected. Traditional instruments couldn’t monitor the whole working process of ground power supply,to ensure high power quality and stable performance of the ground power supply,the aircraft ground power supply monitoring system based on LabVIEW software is designed. The ground power supply is monitored and recorded in real⁃time by the parameters of voltage,frequency,harmonic content and so on,the status of ground power supply is judged with reference standard,an effec⁃tive method is provided to maintain normal operation of the ground power supply and ensure the safety electricity of the aircraft.%当地面电源向飞机供电时,由于情况复杂及飞机的用电需求各不相同,从而对地面电源产生影响。传统的仪器仪表不能监测地面电源工作时的整个过程,为保证地面电源有较高的供电品质和稳定的性能,基于LabVIEW软件设计飞机地面电源监控系统。从电压、频率、谐波含量等多个方面对地面电源进行实时监控并记录,参照一定的标准,对地面电源的状态进行判断,为维护地面电源的正常工作及保证飞机的用电安全提供了更有效的方法。

  18. Design of water environmental factors wireless monitoring system based on LabVIEW%基才LabVIEW的水环境因子无线监测系统设计

    Institute of Scientific and Technical Information of China (English)

    袁琦; 储春华; 李中品; 李洁菁

    2012-01-01

    为了解决传统水产养殖环境因子有线监测系统的布线复杂、可靠性较低等问题,以LabVIEW为开发平台,采用无线数据传输方式,设计了一种水产养殖环境因子无线监测系统。该系统实现了对水环境因子pH值的实时采集、显示和存储,以及历史数据查询等功能。试验结果表明,该系统运行稳定、能够准确地采集和显示水环境因子pH值,且具有操作简便、交互性好、性价比高和易扩展等优点。%In order to resolve the problem existing in traditional wired monitoring system of aquaculture with environmental factors such as wiring complexity, lower reliability etc a kind of environmental factors wireless monitoring system based on LabVIEW was designed by applying the model of wireless data transmission. The system can realize the real-time data acquisition of pH value as well as data display and storage, and also provide the historical data inquire etc. The test results prove that this system is stable, pH value can be accurately measured and displayed, and has advantages of simple operation, good interaction, a good ratio of performance to price and easy expandability.

  19. Programming implementation of performance testing of low light level ICCD camera based on LabVIEW software

    Science.gov (United States)

    Ni, Li; Ye, Qiong; Qian, Yunsheng

    2016-10-01

    Low light level (LLL) imaging technology major roles in the night and in other low light illumination stage, through a variety of low light level image intensifier and charge-coupled device (CCD), gains image information on the target acquisition, photoelectric conversion and high-performance enhancement, storing and displaying. In order to comprehensively test the parameters such as intensified charge-coupled device (ICCD) signal noise ratio (SNR) and dynamic range, this paper uses Laboratory Virtual Instrument Engineering Platform (LabVIEW) software for programming. Data acquisition is the core of the entire software programming, according to the function; it is divided into three parts: a) initializing acquisition cards; b) data collection and storage of useful data; c) closing the acquisition card. NI PXIe-5122 analog acquisition card and PXIe-1435 digital acquisition card were used to collect pal cameras and camera link cameras' shooting pictures, developing with analog interface and the digital interface of ICCD test work. After obtaining data, we can then analyze the performance of the camera by calculating the data according to the principle programmed parameters. Experimental testing process, the use of half-moon test target signal to noise ratio, dynamic range parameters and uniformity test target will be normal. Meanwhile, in order to increase the practicality of the program, we also add the database module into the program. LabSQL is a free, multi-database, cross-platform database access LabVIEW Toolkit. Using LabSQL can access almost any type of database, perform a variety of inquiries and record various operations. With just a simple programming, database access can be achieved in LabVIEW.

  20. Pretreatment of Lignocellulosic Biomass with Ionic Liquids and Ionic Liquid-Based Solvent Systems

    Directory of Open Access Journals (Sweden)

    Qidong Hou

    2017-03-01

    Full Text Available Pretreatment is very important for the efficient production of value-added products from lignocellulosic biomass. However, traditional pretreatment methods have several disadvantages, including low efficiency and high pollution. This article gives an overview on the applications of ionic liquids (ILs and IL-based solvent systems in the pretreatment of lignocellulosic biomass. It is divided into three parts: the first deals with the dissolution of biomass in ILs and IL-based solvent systems; the second focuses on the fractionation of biomass using ILs and IL-based solvent systems as solvents; the third emphasizes the enzymatic saccharification of biomass after pretreatment with ILs and IL-based solvent systems.

  1. Characterization and Modeling of a Water-based Liquid Scintillator

    CERN Document Server

    Bignell, Lindsey J; Diwan, Milind V; Hans, Sunej; Jaffe, David E; Kettell, Steven; Rosero, Richard; Themann, Harry W; Viren, Brett; Worcester, Elizabeth; Yeh, Minfang; Zhang, Chao

    2015-01-01

    We have characterised Water-based Liquid Scintillator (WbLS) using low energy protons, UV-VIS absorbance, and fluorescence spectroscopy. We have also developed and validated a simulation model that describes the behaviour of WbLS in our detector configurations for proton beam energies of 2 GeV, 475 MeV, and 210 MeV and for two WbLS compositions. Our results have enabled us to estimate the light yield and ionisation quenching of WbLS, as well as to understand the influence of the wavelength shifting of Cerenkov light on our measurements. These results are relevant to the suitability of water-based liquid scintillator materials for next generation intensity frontier experiments.

  2. Liquid-based cytology in oral cavity squamous cell cancer.

    Science.gov (United States)

    Navone, Roberto; Pentenero, Monica; Gandolfo, Sergio

    2011-04-01

    Oral exfoliative cytology is a practical tool for early diagnosis of squamous cell carcinoma (OSCC) and potentially malignant lesion (OPML), but is not yet extensively used. A literature review evaluated conventional and liquid-based oral diagnostic cytology efficacy and efficiency. 'Special' techniques like liquid-based cytology, computer-assisted cytology, Oral CDx, DNA ploidy, immunocytochemistry, molecular analyses and microhistology were reviewed. Cytology was useful when diagnosing OSCC and OPML. Oral CDx may assess dysplastic changes in clinically suspicious (class I) lesions, with doubtful efficacy in apparently innocuous (class II) lesions. Flow and/or image cytometry and immunocytochemistry can identify markers for the prediction of evolution of the OPML to OSCC. Molecular biology can detect the minimal residual clonal population of cancer cells in field cancerization and oral mucosa surgical margins. Microhistology is a reliable first level test in class II lesions for selected cases requiring surgical biopsy. Conventional cytology helps in OSCC and OPML screening; liquid-based cytology gives better results, enhancing both sensitivity and specificity, and provides material for further investigation. Sampling with the 'curette technique' permits collection of 'accidental' tissue fragments used as microbiopsies and proved a useful first-level test for the management of class II OPML.

  3. Liquid-based endometrial cytology: the Florence and Bari experience.

    Science.gov (United States)

    Buccoliero, A M; Resta, L; Napoli, A; Taddei, G L

    2009-04-01

    Several diagnostic procedures are available to investigate the endometrium, i.e. sonography, hysteroscopy, biopsy, endometrial curettage and cytology. Among these, endometrial cytology is less commonly utilized. Although the use of cytology in the diagnosis of endometrial adenocarcinoma has already been proposed due to its low cost and simple execution, a general consensus has not been reached. The improvement of the diagnostic capacity of endometrial cytology following the introduction of a liquid-based method suggests that this test should be routinely used in endometrial diagnosis. The main advantages of this method are the reduction in confounding factors, the distribution of cells on a thin layer and the possibility to obtain more slides from the same sample. The aim of this article is to focus on the methodological procedures and diagnostic criteria in liquid-based endometrial cytology based on the experience in two Italian centres: Department of Pathology, University of Bari and Department of Human Pathology and Oncology, University of Florence. The sampling method used by the Bari authors consists in the collection of liquid for uterine distension during hysteroscopy, while the Florence group used an endometrial brush. The sensitivity and specificity at Bari were 75% and 83%, respectively, and were 94-100% and 95-100% at Florence, respectively. Endometrial cytology provided sufficient diagnostic material significantly more often than biopsy. We thus propose that endometrial cytology can be used in routine diagnosis either alone or in association with other diagnostic procedures in order to improve diagnostic accuracy.

  4. Usefulness of liquid-based preparation in urine cytology.

    Science.gov (United States)

    Hwang, Eu Chang; Park, Seong Hoon; Jung, Seung Il; Kwon, Dong Deuk; Park, Kwangsung; Ryu, Soo Bang; Park, Chang Soo

    2007-07-01

    ThinPrep (TP), a liquid-based cytological and non-invasive technique to confirm the diagnosis of bladder cancer, is reported to be a better screening test than the conventional cytospin method. This study compared the new MonoPrep2 (MP), a liquid-based cytological technique, with TP for diagnosing bladder cancer. Between January 2003 and June 2004, urine samples from 284 patients were processed using the TP and MP methods. The cytological diagnosis and the determination of specimen quality were performed separately. The cytological diagnoses were classified into four categories: unsatisfactory, benign, borderline, and malignant. A subsequent biopsy was performed in 73 patients. The cytological diagnoses were compared with the biopsy results to evaluate the sensitivity and specificity of the two methods. Considering all the features examined, the overall specimen quality was comparable between the MP and TP techniques in the majority of cases. The rate of satisfactory specimens was 100% for TP and 98.6% for MP. The diagnostic capacity was similar between MP and TP. The overall sensitivities with MP and TP were 58.6 and 62.0%, respectively, and the specificities were 100 and 97.7%; the differences were not significant (P > 0.05). MP and TP produced comparable results in diagnosing bladder cancer. As MP is less expensive than TP, we recommend MP as an alternative liquid-based cytology method for use in bladder cancer screening.

  5. Refractive Index Measurement of Liquids Based on Microstructured Optical Fibers

    Directory of Open Access Journals (Sweden)

    Susana Silva

    2014-12-01

    Full Text Available This review is focused on microstructured optical fiber sensors developed in recent years for liquid RI sensing. The review is divided into three parts: the first section introduces a general view of the most relevant refractometric sensors that have been reported over the last thirty years. Section 2 discusses several microstructured optical fiber designs, namely, suspended-core fiber, photonic crystal fiber, large-core air-clad photonic crystal fiber, and others. This part is also divided into two main groups: the interferometric-based and resonance-based configurations. The sensing methods rely either on full/selective filling of the microstructured fiber air holes with a liquid analyte or by simply immersing the sensing fiber into the liquid analyte. The sensitivities and resolutions are tabled at the end of this section followed by a brief discussion of the obtained results. The last section concludes with some remarks about the microstructured fiber-based configurations developed for RI sensing and their potential for future applications.

  6. 基于LabVIEW的谐振式微悬臂梁传感器智能激励与检测系统%LabVIEW-based Intelligent Exciting and Detecting System for Resonant Cantilever Sensors

    Institute of Scientific and Technical Information of China (English)

    任艳波; 于海涛; 赵伟; 刘民; 李昕欣

    2015-01-01

    Analog PLL (Phase Locked Loop) circuit designed for resonant micro-cantilever sensing systems suffers from some problems such as low precision and complex operation.To solve the problems,a LabVIEW-based intelligent exciting and detecting system for resonant micro-cantilever sensors was presented.The system combined the open-loop and the closed-loop testing process. The whole detecting process starts from an open -loop test,which gives the key vibration parameters of the resonant micro-cantile-ver,then closed-loop test was carried out based on these parameters with a targeted phase tracing algorithm.Compared with tradi-tional analog PLL circuit,this method takes advantage in faster and more accurate phase tracing procedure.Based on this system,a prototype of portable gas sensor was designed and used to detect carbon dioxide.The test result verifies the capability of fast fre-quency tracking and excellent frequency stability of the sensing system.%为了解决使用模拟锁相环设计传感器接口电路带来的精度低、测量过程繁琐等问题,采用软件锁相环设计了基于LabVIEW的谐振式微悬臂梁传感器智能激励与检测系统。将开环检测与闭环检测相结合,通过开环扫频获取待测传感器的参数信息,并通过在软件部分设计的锁相跟踪算法,使锁相更具针对性,锁相过程更快更准。采用该系统制作了便携式气体传感器样机,并对二氧化碳气体进行了实测,验证了该系统具有快速的频率跟踪能力和良好的频率稳定性。

  7. Design of aircraft automatic test system for electrical power distribution equipment based on LabVIEW%基于LabVIEW的飞机配电控制盒自动测试系统设计

    Institute of Scientific and Technical Information of China (English)

    齐召; 李玉忍; 梁波

    2013-01-01

    The automatic test system based on LabVIEW for electrical power distribution equipment is developed for solving the problems of complicated steps,low efficiency and poor reliability of the manual test method. The system is based on the vir⁃tual instrument technology with a combination of hardware and software. The hardware is used for collection of date and the soft⁃ware is used for analysis of the date. Functions and principles of the system are introduced chiefly. The paper is focus on the de⁃sign of software. A new data management method based on configure file is detailed. The method is flexible and efficient and easy to manage data. The using of configuration file greatly improves the efficiency and scalability of the system by proving of ex⁃periments.%  针对传统飞机配电控制盒手动测试周期长、测试步骤复杂、可靠性低等弊端,提出的一种基于LabVIEW的飞机配电控制盒自动测试系统,用以实现配电盒各项性能的测试。系统采用了软硬件相结合的虚拟仪器技术,硬件实现数据的采集,软件对数据进行分析处理,实现了测试的自动化。介绍了测试系统结构组成,重点给出了系统软件部分设计实现,提出了一种利用配置文件进行指令数据管理的方法,这种方式灵活、高效,方便数据的处理以及测试系统程序的扩展。经测试系统实验证明,这种配置文件的利用方法大大提高了系统的效率。

  8. Betatron radiation based diagnostics for plasma wakefield accelerated electron beams at the SPARC-LAB test facility

    Energy Technology Data Exchange (ETDEWEB)

    Shpakov, V.; Anania, M.P.; Biagioni, A.; Chiadroni, E. [INFN - LNF, via Enrico Fermi 40, 00044 Frascati (Italy); Cianchi, A. [INFN - LNF, via Enrico Fermi 40, 00044 Frascati (Italy); “Tor Vergata” University, via della Ricerca Scientifica 1, 00133 Rome (Italy); Curcio, A. [INFN - LNF, via Enrico Fermi 40, 00044 Frascati (Italy); Dabagov, S. [INFN - LNF, via Enrico Fermi 40, 00044 Frascati (Italy); P.N. Lebedev Physical Institute RAS, Leninskiy Prospekt 53, 119991 Moscow (Russian Federation); NRNU “MEPhI”, Kashirskoe highway 31, 115409 Moscow (Russian Federation); Ferrario, M.; Filippi, F. [INFN - LNF, via Enrico Fermi 40, 00044 Frascati (Italy); Marocchino, A. [Dipartimento SBAI Universitá di Roma ‘La Sapienza’, via Antonio Scarpa 14/16, 00161 Rome (Italy); Paroli, B. [INFN - MI, via Celoria 16, 20133 Milan (Italy); Pompili, R. [INFN - LNF, via Enrico Fermi 40, 00044 Frascati (Italy); Rossi, A.R. [INFN - MI, via Celoria 16, 20133 Milan (Italy); Zigler, A. [Racah Institute of Physics Hebrew University of Jerusalem (Israel)

    2016-09-01

    Recent progress with wake-field acceleration has shown a great potential in providing high gradient acceleration fields, while the quality of the beams remains relatively poor. Precise knowledge of the beam size at the exit from the plasma and matching conditions for the externally injected beams are the key for improvement of beam quality. Betatron radiation emitted by the beam during acceleration in the plasma is a powerful tool for the transverse beam size measurement, being also non-intercepting. In this work we report on the technical solutions chosen at SPARC-LAB for such diagnostics tool, along with expected parameters of betatron radiation. - Highlights: • The betatron radiation parameters in SPARC-LAB wakefiled experiments were studied. • The differences with betatron radiation in other wake-field experiments were highlighted. • The solution for betatron radiation detection was investigated.

  9. Microalgae based biorefinery: evaluation of oil extraction methods in terms of efficiency, costs, toxicity and energy in lab-scale

    OpenAIRE

    Ángel Darío González-Delgado; Viatcheslav Kafarov

    2013-01-01

    Several alternatives of microalgal metabolites extraction and transformation are being studied for achieving the total utilization of this energy crop of great interest worldwide. Microalgae oil extraction is a key stage in microalgal biodiesel production chains and their efficiency affects significantly the global process efficiency. In this study, a comparison of five oil extraction methods in lab-scale was made taking as additional parameters, besides extraction efficiency, the costs of me...

  10. [Analysis of software for identifying spectral line of laser-induced breakdown spectroscopy based on LabVIEW].

    Science.gov (United States)

    Hu, Zhi-yu; Zhang, Lei; Ma, Wei-guang; Yan, Xiao-juan; Li, Zhi-xin; Zhang, Yong-zhi; Wang, Le; Dong, Lei; Yin, Wang-bao; Jia, Suo-tang

    2012-03-01

    Self-designed identifying software for LIBS spectral line was introduced. Being integrated with LabVIEW, the soft ware can smooth spectral lines and pick peaks. The second difference and threshold methods were employed. Characteristic spectrum of several elements matches the NIST database, and realizes automatic spectral line identification and qualitative analysis of the basic composition of sample. This software can analyze spectrum handily and rapidly. It will be a useful tool for LIBS.

  11. LabVIEW-based control and acquisition system for the dosimetric characterization of a silicon strip detector

    Science.gov (United States)

    Ovejero, M. C.; Pérez Vega-Leal, A.; Gallardo, M. I.; Espino, J. M.; Selva, A.; Cortés-Giraldo, M. A.; Arráns, R.

    2017-02-01

    The aim of this work is to present a new data acquisition, control, and analysis software system written in LabVIEW. This system has been designed to obtain the dosimetry of a silicon strip detector in polyethylene. It allows the full automation of the experiments and data analysis required for the dosimetric characterization of silicon detectors. It becomes a useful tool that can be applied in the daily routine check of a beam accelerator.

  12. Gallium-Based Room Temperature Liquid Metals and its Application to Single Channel Two-Liquid Hyperelastic Capacitive Strain Sensors

    Science.gov (United States)

    Liu, Shanliangzi

    Gallium-based liquid metals are of interest for a variety of applications including flexible electronics, soft robotics, and biomedical devices. Still, nano- to microscale device fabrication with these materials is challenging because of their strong adhesion to a majority of substrates. This unusual high adhesion is attributed to the formation of a thin oxide shell; however, its role in the adhesion process has not yet been established. In the first part of the thesis, we described a multiscale study aiming at understanding the fundamental mechanisms governing wetting and adhesion of gallium-based liquid metals. In particular, macroscale dynamic contact angle measurements were coupled with Scanning Electron Microscope (SEM) imaging to relate macroscopic drop adhesion to morphology of the liquid metal-surface interface. In addition, room temperature liquid-metal microfluidic devices are also attractive systems for hyperelastic strain sensing. Currently two types of liquid metal-based strain sensors exist for inplane measurements: single-microchannel resistive and two-microchannel capacitive devices. However, with a winding serpentine channel geometry, these sensors typically have a footprint of about a square centimeter, limiting the number of sensors that can be embedded into. In the second part of the thesis, firstly, simulations and an experimental setup consisting of two GaInSn filled tubes submerged within a dielectric liquid bath are used to quantify the effects of the cylindrical electrode geometry including diameter, spacing, and meniscus shape as well as dielectric constant of the insulating liquid and the presence of tubing on the overall system's capacitance. Furthermore, a procedure for fabricating the two-liquid capacitor within a single straight polydiemethylsiloxane channel is developed. Lastly, capacitance and response of this compact device to strain and operational issues arising from complex hydrodynamics near liquid-liquid and liquid

  13. Seismic Base Isolation Analysis for PASCAR Liquid Metal Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Kuk Hee; Yoo, Bong; Kim, Yun Jae [Korea Univ., Seoul (Korea, Republic of)

    2008-10-15

    This paper presents a study for developing a seismic isolation system for the PASCAR (Proliferation resistant, Accident-tolerant, Self-supported, Capsular and Assured Reactor) liquid metal reactor design. PASCAR use lead-bismuth eutectic (LBE) as coolant. Because the density (10,000kg/m{sup 3}) of LBE coolant is very heavier than sodium coolant and water, this presents a challenge to designers of the seismic isolation systems that will be used with these heavy liquid metal reactors. Finite element analysis is adapted to determine the characteristics of the isolator device. Results are presented from a study on the use of three-dimensional seismic isolation devices to the full-scale reactor. The seismic analysis responses of the two-dimensional and the three-dimensional isolation systems for the PASCAR are compared with that of the conventional fixed base system.

  14. Synthesis and Characterization of Tetramethylethylenediamine-Based Hypergolic Ionic Liquids

    Science.gov (United States)

    Fei, Teng; Cai, Huiwu; Zhang, Yanqiang; Liu, Long; Zhang, Suojiang

    2016-04-01

    Four energetic salts (including two ionic liquids) based on 2-(dimethylamino)-N,N,N-trimethylethanaminium and N,N‧-dialkyl-N,N,N‧,N‧-tetramethylethane-1,2-diaminium was prepared and characterized by 1H- and 13C-NMR, infrared and Raman spectroscopies, and elemental analysis. Their physicochemical properties such as melting and decomposition temperatures, density, viscosity, heat of formation, detonation performance, and specific impulse were measured or calculated. With thermal stability up to 200°C, the resulting ionic liquids show densities from 1.02 to 1.19 g cm-3 and heats of formation from 85.1 to 154.4 kJ mol-1. Moreover, 2-(dimethylamino)-N,N,N-trimethylethanaminium dicyanamide is hypergolic with the oxidizer (100% HNO3) and exhibits potential as a green fuel for bipropellants.

  15. Formulation and Characterization of ADN-Based Liquid Monopropellants

    Science.gov (United States)

    Wingborg, N.; Eldsäter, C.; Skifs, H.

    2004-10-01

    Ternary ionic solutions are promising green propellants to replace monopropellant hydrazine. Ammonium dinitramide, ADN, is well suited as oxidizer in these propellants due to its high solubility. This paper presents the formulation of different ADN-based liquid monopropellants and the characterization of their properties such as stability, density, viscosity and sensitivity. To be able to use ADN-based monopropellants for propulsion applications, ADN must be produced in a way to minimize the effect on the environment and in sufficient quantities. This paper thus also briefly presents the industrial production of ADN in Sweden and the efforts made to optimize the process.

  16. Enhanced Acid/Base Catalysis in High Temperature Liquid Water

    Institute of Scientific and Technical Information of China (English)

    Xiu Yang LU; Qi JING; Zhun LI; Lei YUAN; Fei GAO; Xin LIU

    2006-01-01

    Two novel and environmentally benign solvent systems, organic acids-enriched high temperature liquid water (HTLW) and NH3-enriched HTLW, were developed, which can enhance the reaction rate of acid/base-catalyzed organic reactions in HTLW. We investigated the decomposition of fructose in organic acids-enriched HTLW, hydrolysis of cinnamaldehyde and aldol condensation of phenylaldehyde with acetaldehyde in NH3-enriched HTLW. The experimental results demonstrated that organic acids-enriched or NH3-enriched HTLW can greatly accelerate acid/base-catalyzed organic reactions in HTLW.

  17. Applications Study on Piezoelectric Self-Sensing Actuator Based on LabVIEW%基于LabVIEW的压电自感知执行器应用研究

    Institute of Scientific and Technical Information of China (English)

    杨明刚; 贾艳丽

    2011-01-01

    在结构的振动主动控制中,采用自感知执行器能减小结构的质量和体积,真正实现同位控制.设计了一种基于时分复用解耦系统的压电自感知执行器,使压电元件在传感时隙内作为测量振动的传感器,在执行时隙内作为控制振动的执行器,在放电时隙内释放积累的驱动电荷.设计了开关时序脉冲用于控制3个时隙的切换.基于LabVIEW软件平台,采用正位置反馈控制算法,将时分复用结构的压电自感知执行器用于悬臂梁Ⅰ阶模态的振动主动控制,实验结果表明达到了良好的控制效果.%The self-sensing actuator can be used to decrease structural weight and volume, and to achieve true collocated control in the active structural vibration control. A new piezoelectric self-sensing actuator based on the time-division multiplex de-coupling system has been designed,in which the piezoelectric element served as a sensor to measure vibration in sensing timeslot,and as an actuator to suppress vibration in actuating timeslot.and to release the driving charges in discharge timeslot. The switch sequential pulse was designed and used to control the switching of the three timeslots. Based on Lab VIEW software and with the positive position control algorithm, the first modal active vibration control of the cantilever beam was implemented by using time-division-multiplex piezoelectric self-sensing actuator. Experimental results showed that the good vibration control has been achieved.

  18. 基于LabVIEW的虚拟触摸屏控制面板设计%Design on Virtual Touch-screen Control Panel Based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    李威; 周伦; 许美玲

    2011-01-01

    A picture controlled by touch-screen was developed by LabVIEW to achieve a simulation model of the touch-screen control part of the nitrogen and oxygen making cart. The calling of dynamic link library in LabVIEW was analyzed. The display of the inverter control panel was achieved. The experimental result shows that the method is simple and it has no command on hardware.%利用LabVIEW开发一个触摸屏控制画面,以实现某制氮制氧车仿真模型的触摸屏控制部分。分析了LabVIEW 中动态链接库(DLL)的调用,实现了变频器控制盘的显示。实验结果表明:这种方法简单可行,降低了对硬件的要求。

  19. 基于LabView的煤矿突水监测系统数据处理系统的设计%Design of Data Processing System of Water Inrush Monitoring System of Coal Mine Based on LabView

    Institute of Scientific and Technical Information of China (English)

    范烨; 崔建明

    2012-01-01

    Using G graphical programming language and data flow writing programs, LabView is intuitive and visual. In this paper, LabView development module is used to develop human-computer interface of mining water inrush monitoring system. Data storage, analysis, processing and graphics display is achieved by LabView, so as to realize real-time condition monitoring, fault diagnosing and timely alarming about coal mine water bursting situation.%LabView使用图形化编程语言G编写程序,采用数据流编程方式,具有直观、形象的特点。本文运用LabView开发模块对煤矿突水监测系统进行人机界面的开发。由LabView实现上位机的数据存储、分析、处理、图表显示等功能,从而达到对煤矿突水情况的实时状态监测、故障诊断和及时报警。

  20. Incorporating a Modified Problem-Based Learning Exercise in a Traditional Lecture and Lab-Based Dairy Products Course

    Science.gov (United States)

    Liceaga, Andrea M.; Ballard, Tameshia S.; Skura, Brent J.

    2011-01-01

    A modified problem-based learning (PBL) exercise was implemented in a food science Dairy Products course, which had previously been taught in the traditional lecture and laboratory format only. The first 10 wk of the course consisted of weekly lectures and laboratory exercises. During the remaining 3 wk, students were presented with a case study…

  1. WebSpace - a WebWindows based gateway to the ANL LabSpace. Final report for period September 1, 1995 - August 31, 1998

    Energy Technology Data Exchange (ETDEWEB)

    Furmanski, Wojtek

    2002-04-11

    The goal of this project was to prototype a Web based computational and collaboratory environment that would act as a commodity technologies based front-end or Gateway to larger HPC systems such as ANL LabSpace. The original name - WebSpace - proposed for such a system was taken during the course of this project by Silicon Graphics and used for their Web authoring environment. To avoid confusion, we changed the name of this project's system to WebFlow.

  2. Development of a multilayer mirror for high-intensity monochromatic x-ray using lab-based x-ray source.

    Science.gov (United States)

    Nguyen, Thanh-hai; Song, Seonggeun; Jung, Jin-Ho; Jeon, Insu

    2012-09-15

    A parabolic, multilayer x-ray mirror, which can be used with a general lab-based x-ray source, was designed and fabricated. A glass substrate for the mirror was fabricated. Its surface was determined by following the rotation of a parabolic curve and was polished precisely. On the substrate surface, six W/Al bilayers were deposited to form the multilayer mirror. The effects of the mirror on x-ray images were investigated based on the calculated modulation transfer function (MTF) and image intensity values. Higher MTF and intensity values of an x-ray image were obtained using the mirror.

  3. Lab-on-fiber technology

    CERN Document Server

    Cusano, Andrea; Crescitelli, Alessio; Ricciardi, Armando

    2014-01-01

    This book focuses on a research field that is rapidly emerging as one of the most promising ones for the global optics and photonics community: the "lab-on-fiber" technology. Inspired by the well-established 'lab on-a-chip' concept, this new technology essentially envisages novel and highly functionalized devices completely integrated into a single optical fiber for both communication and sensing applications.Based on the R&D experience of some of the world's leading authorities in the fields of optics, photonics, nanotechnology, and material science, this book provides a broad and accurate de

  4. 基于LabVIEW的单向阀振动信号采集关键技术设计%Design of the key technology of the signal acquisition for check valve based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    徐琪; 刘平; 曾禹乔; 姜韬

    2016-01-01

    ZPM泵中单向阀在工作过程中极易损坏,为了促进生产安全,提高效率。在分析了该单向阀实际振动情况的基础上,结合信号分析与处理技术,以LabVIEW为开发平台,以动态信号采集卡、双核高性能控制器和PXI机箱为硬件基础,对ZPM泵单向阀振动信号采集的关键技术进行了设计。在设计的过程中采用了模块化编程思想、多线程并行处理技术,同时还根据实际需求进行了循环缓冲区的设计以及数据储存策略的设计。经试验,该监测系统与LMS国际公司的振动信号分析仪相比,所采集的信号精度满足要求,系统可以长期连续稳定运行,能实现无人值守的自动化监测。%ZPM check valve in the pump is easily damaged in the process of work ,in order to promote production safety and efficiency .On the analysis of the check valve in the ZPM pump working condition ,that combined the technology of signal analysis and processing , based on the LabVIEW , with dynamic signal acquisition card , dual‐core high‐performance controller and PXI chassis as the foundation of hardware ,the key technology of signal acquisition for ZPM one‐way valve is designed .In the process of design ,the modular programming idea and the mufti‐thread processing technology are adopted ,and the designs of the loop buffer and of the data storage strategy are also carried out ,at the same time .In addition ,it also gives the corresponding program block diagram and code .After the test ,the monitoring system is compared with the vibration signal analysis instrument of LMS International Corporation .The collected signal precision meets the requirement . Thus , the system has a long‐term and continuous stable operation to achieve unattended automatic monitoring .

  5. Design and Research of Electroencephalogram Signal Analyzer based on Lab VIEW%基于LabVIEW的脑电信号分析仪的研究与设计

    Institute of Scientific and Technical Information of China (English)

    梅甜; 周毅; 王民慧; 张振

    2014-01-01

    In order to achieve the integration of EEG signal processing and analysis,as well as extracting effective characteristic EEG indicators for improving the EEG reading speed,a virtual electroencephalogram (EEG,)signal analyzer was designed by Lab-VIEW.The platform could simulate the routine EEG display interfaces.First ,the open biomedical Toolkit and MATLAB script were a-dopted for filtering.Next,the EEG power spectrum was calculated based on the frequency domain analysis,and further extraction of four EEG components(δ,θ,α,β)were analyzed.The results showed that wavelet de-noising had better retention of EEG informa-tion than Fourier filtering did,in addition,the use of MATLAB node could enhance scalability.The differences of four rhythms be-tween interictal and ictal seizures were studied and the change degree varied significantly with different rhythms.%为实现脑电信号处理与分析的一体化,提取有效的脑电信号特征指标,提高脑电图阅读速度,构建出了一套虚拟的脑电图(electroencephalogram,EEG)分析仪。首先使用了虚拟仪器开发软件LabVIEW实现了虚拟的EEG动态采集。再使用其开放的生物医学工具包对信号进行傅里叶滤波,同时联合MATLAB脚本节点,对信号进行小波消噪。然后使用频域分析等方法,在计算EEG信号的功率谱基础上,进一步分析提取的δ、θ、α、β四种脑电节律的成分。结果表明小波消噪较傅里叶滤波能更好地保留EEG信息,MATLAB节点的使用能增强分析仪的扩展性。研究中对癫痫发作间期与发作期进行了节律提取,初步结果显示发作间期与发作期在四种节律上的改变具有差异性。

  6. 基于LabVIEW的焊接过程多信息分析平台%Study on analysis platform with multi-signal information of welding process based LabVIEW

    Institute of Scientific and Technical Information of China (English)

    郭勇; 李志勇; 赵洪志; 闫晓成

    2012-01-01

    Based on a synchronization multi-signal collecting system of arc welding, Lab VIEW is used to develop a multi-signal software, which can analyze the electrical signal and optical signal of welding process with the application of welding current,arc voltage and spectra of arc radiation for gas metal arc welding (GMAW).The system can display the welding current waveform,the arc voltage waveform and the spectra of arc radiation timely.Furthermore,through analyzing of the collected data.it was acquired the UI phase diagram,probability density distribution of the welding current and arc voltage .frequency of short-circuit period verse time,the arc radiation intensity verse wavelength,the Boltzmann figure for temperature calculation,etc.With the application of the information related to arc state,the software can be used for diagnosis of arc welding process and arc physics exploration.%基于焊接多信息同步采集系统,采用LabVIEW图形化语言,以熔化极气保焊的焊接电流、电弧电压、电弧光谱为信号源,构建了包括电信号参数设置、电信号数据分析模块、光信号参数设置与自动选择、光信号数据分析的焊接过程多信息分析平台.可实时显示焊接电流波形、电弧电压波形、电弧辐射光谱等;系统还通过数据分析处理得到U-I相图、焊接电流和电弧电压概率密度、短路时间频次图、电弧辐射光强与波长对应图、计算焊接温度的玻尔兹曼图等,通过上述信息分析,检测电弧状态和信息,可用于焊接过程诊断和焊接电弧物理研究等.

  7. Internal Temperature Test Based on LabVIEW for Fruits and Vegetables in Drying Process%基于LabVIEW的干燥过程果蔬内部温度测试

    Institute of Scientific and Technical Information of China (English)

    黄俭花; 张绪坤; 祝树森; 徐刚; 徐建国

    2012-01-01

    Temperature is one of the important parameters in drying process for fruits and vegetables. A system based on the means of probes to test the internal temperature of fruits and vegetables in drying process is designed. In the system, Lab VIE W is used as the platform to develop virtual panel, the temperature data are shown in real-time with graphical figures and stored. Tab control is used effectively to implement the user-friendly interface with menu patterns. Through A/D conversion, the collected signals of NI9205 module are sent to computer via USB of the lower computer NI CompactDAQ, to construct a complete USB data collection process. Practical application shows that the real-time internal temperature variation of fruits and vegetables in drying process can be monitored by the system, thus the basis for researching the phenomenon of heat transfer inside fruits and vegetables in drying process is provided.%温度是影响果蔬干燥过程的重要参数之一.采用探针法设计了一种测试干燥过程果蔬内部温度的系统.该系统以LabVIEW为平台开发虚拟面板,实时显示图形数值温度数据并进行数据保存,有效运用Tab控件实现菜单式友好用户界面;N19205模块采集信号经过A/D转换,经下位机NI CompactDAQ的USB总线传送至计算机,构建完整的USB数据采集过程.实际应用表明,系统能实时监测干燥过程果蔬内部的温度变化,为干燥过程果蔬内部热传递现象的研究提供有效途径.

  8. Economizer Based Data Center Liquid Cooling with Advanced Metal Interfaces

    Energy Technology Data Exchange (ETDEWEB)

    Timothy Chainer

    2012-11-30

    A new chiller-less data center liquid cooling system utilizing the outside air environment has been shown to achieve up to 90% reduction in cooling energy compared to traditional chiller based data center cooling systems. The system removes heat from Volume servers inside a Sealed Rack and transports the heat using a liquid loop to an Outdoor Heat Exchanger which rejects the heat to the outdoor ambient environment. The servers in the rack are cooled using a hybrid cooling system by removing the majority of the heat generated by the processors and memory by direct thermal conduction using coldplates and the heat generated by the remaining components using forced air convection to an air- to- liquid heat exchanger inside the Sealed Rack. The anticipated benefits of such energy-centric configurations are significant energy savings at the data center level. When compared to a traditional 10 MW data center, which typically uses 25% of its total data center energy consumption for cooling this technology could potentially enable a cost savings of up to $800,000-$2,200,000/year (assuming electricity costs of 4 to 11 cents per kilowatt-hour) through the reduction in electrical energy usage.

  9. Ionic Vapor Composition in Pyridinium-Based Ionic Liquids.

    Science.gov (United States)

    Chaban, Vitaly V; Prezhdo, Oleg V

    2016-05-26

    Strong electrostatic interactions in ionic compounds make vaporization a complex process. The gas phase can contain a broad range of ionic clusters, and the cluster composition can differ greatly from that in the liquid phase. Room-temperature ionic liquids (RTILs) constitute a complicated case due to their ionic nature, asymmetric structure, and a huge versatility of ions and ionic clusters. This work reports vapor-liquid equilibria and vapor compositions of butylpyridinium (BPY) RTILs formed with hexafluorophosphate (PF6), trifluoromethanesulfonate (TF), and bis(trifluoromethanesulfonyl)imide (TFSI) anions. Unlike inorganic crystals, the pyridinium-based RTILs contain significant percentages of charged clusters in the vapor phase. Ion triplets and ion quadruplets each constitute up to 10% of the vapor phase composition. Triples prevail over quadruples in [BPY][PF6] due to the size difference of the cation and the anion. The percentage of charged ionic clusters in the gas phase is in inverse proportion to the mass of the anion. The largest identified vaporized ionic cluster comprises eight ions, with a formation probability below 1%. Higher temperature fosters formation of larger clusters due to an increase of the saturated vapor density.

  10. The Virtual Lab System

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    A virtual lab system is the simulation of real devices and experiments using computer and network tech-nology. It can make users do experiments easily, observe experiment phenomena and results through the remote termi-nal. Consequently, users can get final results to verify relative theory. The article analyses the features of virtual labsystems. A real virtual lab system named "Multimedia Virtual Lab for Digital Circuit Logic Design (MVLDCLD) "which has been developed by the authors and their group is also presented.

  11. USNA DIGITAL FORENSICS LAB

    Data.gov (United States)

    Federal Laboratory Consortium — To enable Digital Forensics and Computer Security research and educational opportunities across majors and departments. Lab MissionEstablish and maintain a Digital...

  12. Magnetic Media Lab

    Data.gov (United States)

    Federal Laboratory Consortium — This lab specializes in tape certification and performance characterization of high density digital tape and isprepared to support the certification of standard size...

  13. USNA DIGITAL FORENSICS LAB

    Data.gov (United States)

    Federal Laboratory Consortium — To enable Digital Forensics and Computer Security research and educational opportunities across majors and departments. Lab Mission Establish and maintain a Digital...

  14. Fabrication and Prototyping Lab

    Data.gov (United States)

    Federal Laboratory Consortium — Purpose: The Fabrication and Prototyping Lab for composite structures provides a wide variety of fabrication capabilities critical to enabling hands-on research and...

  15. Crystallization Formulation Lab

    Data.gov (United States)

    Federal Laboratory Consortium — The Crystallization Formulation Lab fills a critical need in the process development and optimization of current and new explosives and energetic formulations. The...

  16. Pressure Induced Liquid-to-Liquid Transition in Zr-based Supercooled Melts and Pressure Quenched Glasses

    Energy Technology Data Exchange (ETDEWEB)

    Dmowski, W.; Gierlotka, S.; Wang, Z.; Yokoyama, Y.; Palosz, B.; Egami, T.

    2017-07-26

    Through high-energy x-ray diffraction and atomic pair density function analysis we find that Zr-based metallic alloy, heated to the supercooled liquid state under hydrostatic pressure and then quenched to room temperature, exhibits a distinct glassy structure. The PDF indicates that the Zr-Zr distances in this glass are significantly reduced compared to those quenched without pressure. Annealing at the glass transition temperature at ambient pressure reverses structural changes and the initial glassy state is recovered. This result suggests that pressure causes a liquid-to-liquid phase transition in this metallic alloy supercooled melt. Such a pressure induced transition is known for covalent liquids, but has not been observed for metallic liquids. The High Pressure Quenched glasses are stable in ambient conditions after decompression.

  17. Lead-selective neutral carrier based liquid membrane electrode

    Energy Technology Data Exchange (ETDEWEB)

    Lindner, E.; Toth, K.; Pungor, E.; Behm, F.; Oggenfuss, P.; Welti, D.H.; Ammann, D.; Morf, W.E.; Pretsch, E.; Simon, W.

    1984-06-01

    Certain synthetic, lipophilic oxa- and dioxadicarboxylic amides act as lead-selective neutral carriers in liquid-membrane electrodes. Lead is detected as monovalent permeating species of the type PbX/sup +/ (X: OH/sup -/, Cl/sup -/, NO/sub 3//sup -/, CH/sub 3/COO/sup -/). Membranes based on N,N-dioctadecyl-N',N'-dipropyl-3,6-dioxaoctanediamide reject alkali metal ions by a factor of at least 10/sup 3/ and alkaline-earth metal ions by at least 10/sup 4/. 18 references, 4 figures, 4 tables.

  18. Investigation of an electromagnetic calorimeter based on liquid krypton

    Energy Technology Data Exchange (ETDEWEB)

    Aulchenko, V.M.; Klimenko, S.G.; Kolachev, G.M.; Leontiev, L.A.; Onuchin, A.P.; Panin, V.S.; Pril, Yu.V.; Rodyakin, V.A.; Rylin, A.V.; Tayursky, V.A.; Tikhonov, Yu.A. (AN SSSR, Novosibirsk. Inst. Yadernoj Fiziki (The Netherlands)); Cantoni, P.; Frabetti, P.L.; Stagni, L. (Istituto Nazionale di Fisica Nucleare, Bologna (Italy) Bologna Univ. (Italy)); Lo Bianco, G.; Palombo, F. (Istituto Nazionale di Fisica Nucleare, Milan (Italy) Milan Univ. (Italy). Dipt. di Fisica); Manfredi, P.F.; Re, V.; Speziali, V. (Istituto Nazionale di Fisica Nucleare, Milan (Italy) Pavia Univ. (Italy). Dipt. di Elettronica)

    1990-04-15

    Effects determining the energy and spatial resolution of a calorimeter based on liquid krypton have been studied. With cathode strips of 10 mm a spatial resolution of 0.4 mm has been obtained in a cosmic rays test. The energy resolution of the calorimeter (0.4 ton of krypton) has been measured with positrons, achieving a rms of 5.7% at E=130 MeV and 1.7% at E=1200 MeV. The measurements are compared to Monte Carlo simulations. (orig.).

  19. DNA computing model based on lab-on-a-chip and its application to solving the timetabling problem

    Institute of Scientific and Technical Information of China (English)

    Fengyue Zhang; Bo Liu; Wenbin Liu; Qiang Zhang

    2008-01-01

    The essential characteristic of DNA computation is its massive parallelism in obtaining and managing information.With the development of molecular biology technique,the field of DNA computation has made a great progress.By using an advanced biochip technique,laboratory-on-a-chip,a new DNA computing model is presented in the paper to solve a simple timetabling problem,which is a special version ofthe optimization problems.It also plays an important role in education and other industries.With a simulated biological experiment,the result suggested that DNA computation with lab-on-a-chip has the potential to solve a real complex timetabling problem.

  20. Betatron radiation based diagnostics for plasma wakefield accelerated electron beams at the SPARC_LAB test facility

    Science.gov (United States)

    Shpakov, V.; Anania, M. P.; Biagioni, A.; Chiadroni, E.; Cianchi, A.; Curcio, A.; Dabagov, S.; Ferrario, M.; Filippi, F.; Marocchino, A.; Paroli, B.; Pompili, R.; Rossi, A. R.; Zigler, A.

    2016-09-01

    Recent progress with wake-field acceleration has shown a great potential in providing high gradient acceleration fields, while the quality of the beams remains relatively poor. Precise knowledge of the beam size at the exit from the plasma and matching conditions for the externally injected beams are the key for improvement of beam quality. Betatron radiation emitted by the beam during acceleration in the plasma is a powerful tool for the transverse beam size measurement, being also non-intercepting. In this work we report on the technical solutions chosen at SPARC_LAB for such diagnostics tool, along with expected parameters of betatron radiation.

  1. Automation of Silica Bead-based Nucleic Acid Extraction on a Centrifugal Lab-on-a-Disc Platform

    Science.gov (United States)

    Kinahan, David J.; Mangwanya, Faith; Garvey, Robert; Chung, Danielle WY; Lipinski, Artur; Julius, Lourdes AN; King, Damien; Mohammadi, Mehdi; Mishra, Rohit; Al-Ofi, May; Miyazaki, Celina; Ducrée, Jens

    2016-10-01

    We describe a centrifugal microfluidic ‘Lab-on-a-Disc’ (LoaD) technology for DNA purification towards eventual integration into a Sample-to-Answer platform for detection of the pathogen Escherichia coli O157:H7 from food samples. For this application, we use a novel microfluidic architecture which combines ‘event-triggered’ dissolvable film (DF) valves with a reaction chamber gated by a centrifugo-pneumatic siphon valve (CPSV). This architecture permits comprehensive flow control by simple changes in the speed of the platform innate spindle motor. Even before method optimisation, characterisation by DNA fluorescence reveals an extraction efficiency of 58%, which is close to commercial spin columns.

  2. The lab of fame

    CERN Multimedia

    Antonella Del Rosso

    2014-01-01

    For a third time, CERN is organising the Swiss heat of Famelab, the world’s leading science communication competition that has already gathered over 5,000 young and talented scientists and engineers from all across the planet.   Besides their degrees, the scientists who participate in Famelab have another thing in common: their passion for communicating science. Coming from a variety of scientific fields, from medicine to particle physics and microbiology, the contestants have three minutes to present a science, technology, mathematics or engineering-based talk using only the props he or she can carry onto the stage; PowerPoint presentations are not permitted. The contestants are then judged by a panel of three judges who evaluate the content, clarity and charisma of their talks. What's unique about FameLab is the fact that content is an important aspect of the performance. At the end of their presentation, contestants are often questioned about the scientific relevance of...

  3. 基于DLL技术和COM组件技术实现LabVIEW和MATLAB混合编程%IMPLEMENTING MIXED PROGRAMMING WITH LABVIEW AND MATLAB BASED ON DLL TECHNOLOGY AND COM COMPONENT TECHNOLOGY

    Institute of Scientific and Technical Information of China (English)

    宋广东; 王昌; 王金玉; 路璐; 魏玉宾

    2013-01-01

    LabVIEW和MATLAB混合编程应用日益广泛,然而大多数开发软件在客户端应用时需要同步安装MATLAB,大大限制了软件的推广应用.针对LabVIEW和MATLAB混合编程开发软件发布后独立于MATLAB运行的要求,从LabVIEW和MATLAB共同支持的数据接口技术出发,论述LabVIEW调用MATLAB计算代码的方法,比较每种接口技术的优势和缺点.通过实例实现了基于DLL(动态链接库)技术和COM(基于组件对象模型)组件技术的LabVIEW与MATLAB混合编程.成功实现了应用程序独立运行并明显改善了执行效率.%The application of mixed programming with Lab VIEW and MATLAB is increasingly widespread, but most developing software need to install MATLAB synchronously when applied in client, this greatly limits the promotion and application of the software. In order to meet the demand of the software mixed programming with LabVIEW and MATLAB that after its release it runs independently to MATLAB, in this paper we discuss the method of LabVIEW calling MATLAB computing code based on the data interface technology jointly supported by the both, compare the advantages and disadvantages of each interface technology. The mixed programming with LabVIEW and MATLAB based on DLL (dynamic link library) technology and COM (Component Object Model) component technology is achieved through examples. The software runs independently to MATLAB is successful realised and the efficiency is significantly improved.

  4. Imidazolium-based ionic liquids grafted on solid surfaces.

    Science.gov (United States)

    Xin, Bingwei; Hao, Jingcheng

    2014-01-01

    Supported ionic liquids (SILs), which refer to ionic liquids (ILs) immobilized on supports, are among the most important derivatives of ILs. The immobilization process of ILs can transfer their desired properties to substrates. Combination of the advantages of ILs with those of support materials will derive novel performances while retaining properties of both moieties. SILs have been widely applied in almost all of fields involving ILs, and have brought about drastic expansion of the ionic liquid area. As green media in organic catalytic reactions, based on utilizing the ability of ILs to stabilize the catalysts, they have many advantages over free ILs, including avoiding the leaching of ILs, reducing their amount, and improving the recoverability and reusability of both themselves and catalysts. This has critical significance from both environmental and economical points of view. As novel functional materials in surface science and material chemistry, SILs are ideal surface modifying agents. They can modify and improve the properties of solids, such as wettability, lubricating property, separation efficiency and electrochemical response. With the achievements in the field of ILs, using magnetic nanoparticles (MNPs) to SILs has drawn increasing attention in catalytic reactions and separation technologies, and achieved substantial progress. The combination of MNPs and ILs renders magnetic SILs, which exhibit the unique properties of ILs as well as facile separation by an external magnetic field. In this article, we focus on imidazolium-based ILs covalently grafted to non-porous and porous inorganic materials. The excellent stability and durability of this kind of SILs offer a great advantage compared with free ILs and IL films physically adsorbed on substrates without covalent bonds. Including examples from our own research, we overview mainly the applications and achievements of covalent-linked SILs in catalytic reactions, surface modification, separation

  5. Virtual Instrument for Determining Rate Constant of Second-Order Reaction by pX Based on LabVIEW 8.0.

    Science.gov (United States)

    Meng, Hu; Li, Jiang-Yuan; Tang, Yong-Huai

    2009-01-01

    The virtual instrument system based on LabVIEW 8.0 for ion analyzer which can measure and analyze ion concentrations in solution is developed and comprises homemade conditioning circuit, data acquiring board, and computer. It can calibrate slope, temperature, and positioning automatically. When applied to determine the reaction rate constant by pX, it achieved live acquiring, real-time displaying, automatical processing of testing data, generating the report of results; and other functions. This method simplifies the experimental operation greatly, avoids complicated procedures of manual processing data and personal error, and improves veracity and repeatability of the experiment results.

  6. 基于Web的实验室教学信息管理系统的设计及实现%Design and Implementation of Web-Based Lab Teaching Information Management System

    Institute of Scientific and Technical Information of China (English)

    倪晟

    2011-01-01

    The article is concentrated on structuring a Web-based lab teaching information management system based on the practice requirement of lab teaching. This system adopts the mode of B/S structure,by using the technique of ASP.NET, C#, AJAX,etc. to construct a new mode of lab teaching arrangement, which improves the utilization rate of the lab.%根据高校实验室教学的实际需求,设计了一个基于Web的实验室教学信息管理系统.该系统采用B/S结构,运用ASP.NET、C#、AJAX等技术,构建实验室教学安排预约新模式几有效地提高了实验室的利用率.

  7. Development of a lab-on-chip electrochemical biosensor for water quality analysis based on microalgal photosynthesis.

    Science.gov (United States)

    Tsopela, A; Laborde, A; Salvagnac, L; Ventalon, V; Bedel-Pereira, E; Séguy, I; Temple-Boyer, P; Juneau, P; Izquierdo, R; Launay, J

    2016-05-15

    The present work was dedicated to the development of a lab-on-chip device for water toxicity analysis and more particularly herbicide detection in water. It consists in a portable system for on-site detection composed of three-electrode electrochemical microcells, integrated on a fluidic platform constructed on a glass substrate. The final goal is to yield a system that gives the possibility of conducting double, complementary detection: electrochemical and optical and therefore all materials used for the fabrication of the lab-on-chip platform were selected in order to obtain a device compatible with optical technology. The basic detection principle consisted in electrochemically monitoring disturbances in metabolic photosynthetic activities of algae induced by the presence of Diuron herbicide. Algal response, evaluated through oxygen (O2) monitoring through photosynthesis was different for each herbicide concentration in the examined sample. A concentration-dependent inhibition effect of the herbicide on photosynthesis was demonstrated. Herbicide detection was achieved through a range (blank - 1 µM Diuron herbicide solution) covering the limit of maximum acceptable concentration imposed by Canadian government (0.64 µM), using a halogen white light source for the stimulation of algal photosynthetic apparatus. Superior sensitivity results (limit of detection of around 0.1 µM) were obtained with an organic light emitting diode (OLED), having an emission spectrum adapted to algal absorption spectrum and assembled on the final system.

  8. Investigating the Role of an Inquiry-Based Biology Lab Course on Student Attitudes and Views toward Science.

    Science.gov (United States)

    Jeffery, Erica; Nomme, Kathy; Deane, Thomas; Pollock, Carol; Birol, Gülnur

    2016-01-01

    Students' academic experiences can influence their conceptualization of science. In contrast experts hold particular beliefs, perceptions, opinions, and attitudes about science that are often absent in first-year undergraduate students. Shifts toward more expert-like attitudes and views have been linked to improved student engagement, critical-thinking ability, conceptual understanding, and academic performance. In this study, we investigate shifts in attitudes and views toward science by students in four biology classes with differences in student enrollment, academic support, and instruction. We observe significant, positive effects of enrollment in a guided-inquiry lab course and academic performance on the percentage of expert-like student attitudes and views at the end of term. We also identify variation in two aspects of student attitudes and views: 1) confidence and interest and 2) understanding and acceptance. In particular, enrollment in the lab course boosts student confidence and interest in scientific inquiry in the short term, even for students with low academic performance or little English-language experience. Our results suggest that low-performing students in particular may require additional opportunities for experiential learning or greater academic support to develop expert-like perceptions of biology as a science.

  9. 基于CIE LAB的标签检测技术%Label Detection Technology Based on CIE LAB

    Institute of Scientific and Technical Information of China (English)

    陈府庭; 汪仁煌

    2011-01-01

    为实现羽毛球标签是否合格的自动检测,提出一种基于CIE 1976 LAB空间的色差计算方法.该方法通过从RGB颜色空间转换到CIELAB颜色空间上,利用球头底胶与各种标签的正表面颜色的相异,由A、B分量计算它们之间的色差,与设定的阈值进行比较,计算出未贴正的区域,以此判断出标签是否合格.该方法对于标签自动检测具有较好的效果.%An approach of detecting whether badminton label is qualified in CIE LAB model is presented. It turns image data from RGB model to CIE LAB model, because of the different colors between the ball' s head and a variety of labels, then calculates color using A, B variables. And comparing the threshold set, the area which is not posted is calculated to judge whether label is qualified. The approach is effective in label automatic detection.

  10. Newly developed liquid-based cytology. TACAS™: cytological appearance and HPV testing using liquid-based sample.

    Science.gov (United States)

    Kubushiro, Kaneyuki; Taoka, Hideki; Sakurai, Nobuyuki; Yamamoto, Yasuhiro; Kurasaki, Akiko; Asakawa, Yasuyuki; Iwahara, Minoru; Takahashi, Kei

    2011-09-01

    Cell profiles determined by the thin-layer advanced cytology assay system (TACAS™), a liquid-based cytology technique newly developed in Japan, were analyzed in this study. Hybrid capture 2 (HC-2) was also performed using the liquid-based samples prepared by TACAS to ascertain its ability to detect human papillomavirus (HPV). Cell collection samples from uterine cervix were obtained from 359 patients and examined cytologically. A HC-2 assay for HPV was carried out in the cell specimens. All specimens were found to show background factors such as leukocytes. After excluding the 5 unsatisfactory cases from the total 354 cases, 82 cases (23.2%) were positive and 272 cases (76.8%) were negative for HPV. Cell specimens from 30 HPV-positive cases and 166 HPV-negative cases were subjected to 4 weeks of preservation at room temperature. Then, when subsequently re-assayed, 28 cases (93.3%) in the former group were found to be HPV positive and 164 cases (98.8%) in the latter group were found to be HPV negative. These results supported the excellent reproducibility of TACAS for HPV testing. A reasonable inference from the foregoing analysis is that TACAS may be distinguished from other liquid-based cytological approaches, such as ThinPrep and SurePath, in that it can retain the cell backgrounds. Furthermore, this study raises the possibility that cell specimens prepared using TACAS could be preserved for at least 4 weeks prior to carrying out a HC-2 assay for HPV.

  11. Dual-beam laser autofocusing system based on liquid lens

    Science.gov (United States)

    Zhang, Fumin; Yao, Yannan; Qu, Xinghua; Zhang, Tong; Pei, Bing

    2017-02-01

    A dual-beam laser autofocusing system is designed in this paper. The autofocusing system is based on a liquid lens with less moving parts and fast response time, which makes the system simple, reliable, compact and fast. A novel scheme "Time-sharing focus, fast conversion" is innovatively proposed. The scheme effectively solves the problem that the guiding laser and the working laser cannot focus at the same target point because of the existence of chromatic aberration. This scheme not only makes both guiding laser and working laser achieve optimal focusing in guiding stage and working stage respectively, but also greatly reduces the system complexity and simplifies the focusing process as well as makes autofocusing time of the working laser reduce to about 10 ms. In the distance range of 1 m to 30 m, the autofocusing spot size is kept under 4.3 mm at 30 m and just 0.18 mm at 1 m. The spot size is much less influenced by the target distance compared with the collimated laser with a micro divergence angle for its self-adaptivity. The dual-beam laser autofocusing system based on liquid lens is fully automatic, compact and efficient. It is fully meet the need of dynamicity and adaptivity and it will play an important role in a number of long-range control applications.

  12. Performance of Water-Based Liquid Scintillator: An Independent Analysis

    Directory of Open Access Journals (Sweden)

    D. Beznosko

    2014-01-01

    Full Text Available The water-based liquid scintillator (WbLS is a new material currently under development. It is based on the idea of dissolving the organic scintillator in water using special surfactants. This material strives to achieve the novel detection techniques by combining the Cerenkov rings and scintillation light, as well as the total cost reduction compared to pure liquid scintillator (LS. The independent light yield measurement analysis for the light yield measurements using three different proton beam energies (210 MeV, 475 MeV, and 2000 MeV for water, two different WbLS formulations (0.4% and 0.99%, and pure LS conducted at Brookhaven National Laboratory, USA, is presented. The results show that a goal of ~100 optical photons/MeV, indicated by the simulation to be an optimal light yield for observing both the Cerenkov ring and the scintillation light from the proton decay in a large water detector, has been achieved.

  13. Liquid crystal devices based on photoalignment and photopatterning materials

    Science.gov (United States)

    Chigrinov, Vladimir

    2014-02-01

    Liquid crystal (LC) display and photonics devices based on photo-alignment and photo-patterning LC cells are developed. A fast switchable grating based on ferroelectric liquid crystals and orthogonal planar alignment by means of photo alignments. Both 1D and 2D gratings have been constructed. The proposed diffracting element provides fast response time of around 20 μs, contrast of 7000:1 and high diffraction efficiency, at the electric field of 6V/μm. A switchable LC Fresnel zone lens was also developed with the efficiency of ~42% that can be further improved, and the switching time for the 3 μm thick cell is ~6.7 ms which is relatively fast in comparison of existing devices. Thus, because of the photoalignment technology the fabrication of Fresnel lens became considerably simpler than others. A thin high spatial resolution, photo-patterned micropolarizer array for complementary metal-oxide-semiconductor (CMOS) image sensors was implemented for the complete optical visualization of so called "invisible" objects, which are completely transparent (reflective) and colorless. Four Stokes parameters, which fully characterized the reflected light beam can be simultaneously detected using the array of photo-patterned polarizers on CMOS sensor plate. The cheap, high resolution photo-patterned LC matrix sensor was developed to be able successfully compete with the expensive and low reliable wire grid polarizer patterned arrays currently used for the purpose.

  14. 基于LabVIEW的电容加速度计测试软件设计%Design of testing software of capacitive accelerometer based on LabVIEW

    Institute of Scientific and Technical Information of China (English)

    刘珊珊; 赵军荣; 刘双峰

    2011-01-01

    To discuss the features of LabVIEW which is an open virtual instrument platform and the principle of data acquisition in the capacitive accelerometer.Using the dynamic characteristics and virtual instrument of the graphical programming language LabVIEW to constitute user interface dynamic display and interaction.At the same time to develop a computer-controlled data acquisition system.with the help of LabVIEW programming the data acquisition card can finish the whole process including data acquisition and computational analysis.The experiment result shows that using this approach can avoid the complex language programming,reduce the time of software development,simplify the development process and also increase the flexibility of the application.%阐述了开放式虚拟仪器平台LabVIEW的特点;论述了电容式加速度计的数据采集原理;利用图形化编程语言LabVIEW的虚拟仪器和动态特性,在计算机上构成用户界面动态显示和交互,开发出了一个由计算机控制的数据采集系统,数据采集卡配合虚拟仪器中的LabVIEW编程,就能完成数据采集和计算分析的整个过程。实验证明采用这种方法省去了复杂的语言编程,缩短了软件的开发时间,简化了开发过程,同时也增加了应用的灵活性。

  15. Puzzle-based versus traditional lecture: comparing the effects of pedagogy on academic performance in an undergraduate human anatomy and physiology II lab.

    Science.gov (United States)

    Stetzik, Lucas; Deeter, Anthony; Parker, Jamie; Yukech, Christine

    2015-06-23

    A traditional lecture-based pedagogy conveys information and content while lacking sufficient development of critical thinking skills and problem solving. A puzzle-based pedagogy creates a broader contextual framework, and fosters critical thinking as well as logical reasoning skills that can then be used to improve a student's performance on content specific assessments. This paper describes a pedagogical comparison of traditional lecture-based teaching and puzzle-based teaching in a Human Anatomy and Physiology II Lab. Using a single subject/cross-over design half of the students from seven sections of the course were taught using one type of pedagogy for the first half of the semester, and then taught with a different pedagogy for the second half of the semester. The other half of the students were taught the same material but with the order of the pedagogies reversed. Students' performance on quizzes and exams specific to the course, and in-class assignments specific to this study were assessed for: learning outcomes (the ability to form the correct conclusion or recall specific information), and authentic academic performance as described by (Am J Educ 104:280-312, 1996). Our findings suggest a significant improvement in students' performance on standard course specific assessments using a puzzle-based pedagogy versus a traditional lecture-based teaching style. Quiz and test scores for students improved by 2.1 and 0.4% respectively in the puzzle-based pedagogy, versus the traditional lecture-based teaching. Additionally, the assessments of authentic academic performance may only effectively measure a broader conceptual understanding in a limited set of contexts, and not in the context of a Human Anatomy and Physiology II Lab. In conclusion, a puzzle-based pedagogy, when compared to traditional lecture-based teaching, can effectively enhance the performance of students on standard course specific assessments, even when the assessments only test a limited

  16. Application of sensitive, high-resolution imaging at a commercial lab-based X-ray micro-CT system using propagation-based phase retrieval.

    Science.gov (United States)

    Bidola, P; Morgan, K; Willner, M; Fehringer, A; Allner, S; Prade, F; Pfeiffer, F; Achterhold, K

    2017-02-09

    Several dedicated commercial lab-based micro-computed tomography (μCT) systems exist, which provide high-resolution images of samples, with the capability to also deliver in-line phase contrast. X-ray phase contrast is particularly beneficial when visualizing very small features and weakly absorbing samples. The raw measured projections will include both phase and absorption effects. Extending our previous work that addressed the optimization of experimental conditions at the commercial ZEISS Xradia 500 Versa system, single-distance phase-contrast imaging is demonstrated on complex biological and material samples. From data captured at this system, we demonstrate extraction of the phase signal or the correction of the mixed image for the phase shift, and show how this procedure increases the contrast and removes artefacts. These high-quality images, measured without the use of a synchrotron X-ray source, demonstrate that highly sensitive, micrometre-resolution imaging of 3D volumes is widely accessible using commercially advanced laboratory devices.

  17. Physics Labs with Flavor

    Science.gov (United States)

    Agrest, Mikhail M.

    2009-01-01

    This paper describes my attempts to look deeper into the so-called "shoot for your grade" labs, started in the '90s, when I began applying my teaching experience in Russia to introductory physics labs at the College of Charleston and other higher education institutions in South Carolina. The term "shoot for your grade" became popular among…

  18. Making Real Virtual Labs

    Science.gov (United States)

    Keller, Harry E.; Keller, Edward E.

    2005-01-01

    Francis Bacon began defining scientific methodology in the early 17th century, and secondary school science classes began to implement science labs in the mid-19th century. By the early 20th century, leading educators were suggesting that science labs be used to develop scientific thinking habits in young students, and at the beginning of the 21st…

  19. Implementation of Autonomous Robotic Vehicle Control System Based on LabVIEW and PID Controller%基于LabVIEW和PID控制器的自主移动小车控制系统的实现

    Institute of Scientific and Technical Information of China (English)

    石伟

    2013-01-01

    对自主移动小车按照预设轨迹移动的制系统进行了数学建模,提出了基于LabVIEW的PID控制器来实现对小车位置的控制,研究表明,基于LabVIEW的PID控制器能够有效控制小车的移动,控制精度良好,有实际应用价值.

  20. Rapid detection of aflatoxigenic Aspergillus sp. in herbal specimens by a simple, bendable, paper-based lab-on-a-chip.

    Science.gov (United States)

    Chaumpluk, Piyasak; Plubcharoensook, Pattra; Prasongsuk, Sehanat

    2016-06-01

    Postharvest herbal product contamination with mycotoxins and mycotoxin-producing fungi represents a potentially carcinogenic hazard. Aspergillus flavus is a major cause of this issue. Available mold detection methods are PCR-based and rely heavily on laboratories; thus, they are unsuitable for on-site monitoring. In this study, a bendable, paper-based lab-on-a-chip platform was developed to rapidly detect toxigenic Aspergillus spp. DNA. The 3.0-4.0 cm(2) chip is fabricated using Whatman™ filter paper, fishing line and a simple plastic lamination process and has nucleic acid amplification and signal detection components. The Aspergillus assay specifically amplifies the aflatoxin biosynthesis gene, aflR, using loop-mediated isothermal amplification (LAMP); hybridization between target DNA and probes on blue silvernanoplates (AgNPls) yields colorimetric results. Positive results are indicated by the detection pad appearing blue due to dispersed blue AgNPls; negative results are indicated by the detection pad appearing colorless or pale yellow due to probe/target DNA hybridization and AgNPls aggregation. Assay completion requires less than 40 min, has a limit of detection (LOD) of 100 aflR copies, and has high specificity (94.47%)and sensitivity (100%). Contamination was identified in 14 of 32 herbal samples tested (43.75%). This work demonstrates the fabrication of a simple, low-cost, paper-based lab-on-a-chip platform suitable for rapid-detection applications.