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28 results for “reference measurement”
Seasonal reference harvest measurements of vegetation at 15 net primary production (NPP) study sites at Jornada Basin LTER, 1989-ongoing
This data package contains reference harvest measurements for the long-term Net Primary Production (NPP) study at the Jornada Basin LTER. Data here include horizontal cover, vertical height, and aboveground biomass of plants harvested near, but outside, a grid of permanent NPP quadrats at each of 15 NPP sites. These sites were selected to represent the 5 major ecosystem types in the Chihuahuan Desert (upland grasslands, playa grasslands, mesquite-dominated shrublands, creosotebush-dominated shrublands, tarbush-dominated shrublands). For each ecosystem type, three sites were selected to represent the range in variability in production and plant diversity; thus the locations are not replicates. All sites are excluded from domestic grazing. Eleven sites are in non-grazed pastures, and at the other four sites 1 hectare areas around the observational plots were fenced in 1988. At all sites a grid of 49 (48 at one playa location) 1m x 1m replicate quadrats was laid out when sampling began in 1989. Harvests are made outside the quadrat grid, but inside the fence. Height and cover are recorded in the field. Live biomass is weighed in the lab and all measurements are recorded as reference harvest data. Subsequently, regressions between the harvested biomass and plant volume values are used to derive allometric equations that determine biomass from non-destructive volume measurements in the permanent NPP quadrats. Further details are described in the methods metadata. This is an ongoing study with new harvest data (from selected species) collected in the spring, fall, and winter each year. Attention: These data are not appropriate for estimates of percentage cover because of the way the data are collected.
Reference percentiles for carotid measures of subclinical atherosclerosis in children and adolescents – Data from the KiGGS study
<p>The dataset presents reference centile data for carotid intima-media thickness as well as four carotid stiffness parameters. The reference percentiles are based on data from the German Health Interview and Examination Survey for Children and Adolescents 2003-2006 (KiGGS). KiGGS started as a cross-sectional study conducted between 2003 and 2006 which was based on a nationally representative sample and aimed at obtaining comprehensive data on the health of children and adolescents aged 0 to 17 years living in Germany. Detailed information on study design and conduct has been published in peer reviewed journals as well as detailed papers on individual parameters. The documentation provides relevant references.<br> <br> 11 years later, KiGGS Wave 2 (2014-2017) was conducted as an interview and examination survey. Carotid sonography was attempted at follow-up (KiGGS2) in all 4,798 participants of the KiGGS cohort aged 14 to 28 years. Carotid intima-media thickness (CIMT) was successfully measured in 4,709 participants. Reference centiles for the distensibility coefficient, stiffness index ß, Young's elastic modulus and Peterson's elastic modulus were computed using data on 4,305 adolescents and young adults aged 14 to 28.</p>
Database on Certified Reference Materials measured with PAT tools for validation and verification purposes
<p>The H2020 PAT4Nano project aims to develop and demonstrate Process Analytical Technologies (PAT) tools for nanosuspension characterization which have sufficiently high resolution, accuracy, and speed, for real-time industrial process monitoring and control. Real time monitoring is desired for example to obtain: small, high precision, specialty batch of materials, processing monitoring of nucleation/growth/milling of materials at different scales (lab, pilot, production), and for producing feedback loops (adapt T, pH, etc.,) needed for process control.<br> Laser diffraction (LD), Spatially Resolved Dynamic Light Scattering (SR-DLS), Cross-Correlation Dynamic Light Scattering (CC-DLS), Ultrasound Nanoparticle Sizer (UNPS), Raman, and Transmission Electron Microscopy (TEM) are the main PAT tools used in this project. For validation and verification purposes of these measurement techniques, polystyrene and silica samples (200 and 1000 nm particle size) were selected as (Certified) Reference Materials ((C))RMs) by the consortium partners. The results described in this database are particle size measurements using PAT methods in an offline mode. The particle size and particle size distribution data are presented as the D10, D50 and D90 and PDI/span measured with each PAT tool.<br> Raman spectra of the CRMs are presented as well. Here, particle size data was extracted by using chemometric software. Lastly, TEM images of the CRMs are included in the database to cross-correlate and cross-validate the results of the spectroscopic and scattering PAT tools.</p>
Reference Measurements of Pavement Samples
<p>Data for MDPI Sensors article <em>Performance Assessment of Reference Modelling Methods for Defect Evaluation in Asphalt Concrete </em>(doi: <a href="https://doi.org/10.3390/s21248190">10.3390/s21248190</a>). Contains data related to Sections 2.3 and 3.1 of the paper. Data describe reference measurements of pavement samples.</p> <p>Data are registered point clouds in ASCII text XYZ format in an arbitrary coordinate system.</p>
PIE LTER measurements of the two tallest Phragmites australis stems per five meter interval along transects at the Argilla Rd. salt marsh restoration site (Ipswich, MA) and Rough Meadows reference marsh (Rowley, MA – Stackyard Road area).
The file contains measurements of the two tallest Phragmites australis stems per five meter interval along transects at the Argilla Rd. salt marsh restoration site (Ipswich, MA) and Rough Meadows reference marsh (Rowley, MA – Stackyard Road area). The culvert feeding Argilla Marsh was enlarged in late November 1998, thus data from 1999 onward is considered as representing a hydrologically restored marsh. A long term study not directly part of the PIE LTER, but a companion study related to tidal restrictions and hydrological alterations of salt marshes in the Plum Island ecosystem.
Text-fig. 2. The distinction between fossil plants (a) and plant fossils (b). a: Reconstruction of a late Carboniferous arborescent lycopsid, often referred to as the Lepidodendron-tree; artwork by A. Townsend (formerly of National Museum Wales, Cardiff, UK; see Townsend et al. 1998); b: Lepidodendron aculeatum STERNB.; Middle Coal Measures Formation (Duckmantian – upper Bashkirian), Brymbo, near Wrexham, UK (see Thomas et al. 2020: fig. 16b); National Museum Wales specimen 2013.43G.88. in Naming Of Parts: The Use Of Fossil-Taxa In Palaeobotany
Text-fig. 2. The distinction between fossil plants (a) and plant fossils (b). a: Reconstruction of a late Carboniferous arborescent lycopsid, often referred to as the Lepidodendron-tree; artwork by A. Townsend (formerly of National Museum Wales, Cardiff, UK; see Townsend et al. 1998); b: Lepidodendron aculeatum STERNB.; Middle Coal Measures Formation (Duckmantian – upper Bashkirian), Brymbo, near Wrexham, UK (see Thomas et al. 2020: fig. 16b); National Museum Wales specimen 2013.43G.88.
Fig. 1. Tsaganomyid cheek teeth showing reference points for measurements, A, B in On Tsaganomyidae (Rodentia, Mammalia) of Asia
Fig. 1. Tsaganomyid cheek teeth showing reference points for measurements, A, B. Lateral view of cheek teeth. A. p4. B. Other cheek teeth except p4. C–E. Occlusal view of cheek teeth. C. Upper cheek teeth. D, E. Lower cheek teeth. D. Less worn. E. More worn. Abbreviations are: h, enamel height; h1, enamel height on lingual side of upper teeth (buccal side of lower teeth); h2, on buccal side of upper teeth (lingual side of lower teeth); h3, enamel height between two roots on anterobuccal side on p4; L, Length; and W, width.
DIY Particle Detector: reference measurement data
<p>This dataset is released along the data analysis source code of <a href="https://github.com/ozel/DIY_particle_detector">github.com/ozel/DIY_particle_detector</a> and <a href="https://doi.org/10.5281/zenodo.3361755">10.5281/zenodo.3361755</a>.</p> <p>Since the binary files are large, they are not part of the github archive (but stored via github's LFS feature for large files).</p> <p>The files are in python's pickle format, created using python version 3.6.5, pandas module version 0.24.1 and numpy module version 1.14.3. </p> <p>The measurements are taken with the diode-based detector design detailed in the repository above besides the following two files, which are recorded with iPadPix (<a href="https://doi.org/10.1088/1748-0221/11/11/C11032">https://doi.org/10.1088/1748-0221/11/11/C11032</a>) for comparison:<br> 3hoursRadonBalloon_2019-02-10_14-43-21___2321___2-56.pkl<br> KCL_block_bare_2019-02-11_20-54-41___1083___1-03.pkl</p> <p> </p> <p> </p> <p> </p>
Text-fig. 4. Sedimentological log of the Main Cenoceras Bed and associated strata in the Quantocks Beds (Lyra Subzone) at Helwell Bay, Doniford (measured at NGR ST 0802 4314 and ST 0336 4305). BGS bed no. refers to bed numbers employed in Whittaker and Green (1983). in 'Cenoceras Islands' In The Blue Lias Formation (Lower Jurassic) Of West Somerset, Uk: Nautilid Dominance And Influence On Benthic Faunas
Text-fig. 4. Sedimentological log of the Main Cenoceras Bed and associated strata in the Quantocks Beds (Lyra Subzone) at Helwell Bay, Doniford (measured at NGR ST 0802 4314 and ST 0336 4305). BGS bed no. refers to bed numbers employed in Whittaker and Green (1983).
Measurements on reference materials for SThM measurand versus thermal conductivity calibration curve
<p>This sheet presents the results of measurements carried out on calibration samples using the SThM technique as part of the NanoWires project. The thermal conductivity of the samples was previously characterised using a traceable technique. Measurement results are given with associated standard uncertainty. The thermal conductivity range studied was between 0.187 and 117 W.m<sup>-1</sup>.K<sup>-1</sup>. These measurements were used to construct the thermal conductivity calibration curve for a SThM probe.</p> <p>The 19ENG05 NanoWires project has received funding from the EMPIR programme co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.</p>
Experimental dataset referring to: Non-intrusive temperature measurements for transient freezing in laminar internal flow using laser induced fluorescence
<p>This data set corresponds to the paper 'Non-intrusive temperature measurements for transient freezing in laminar internal flow using laser induced fluorescence. Please cite this paper when using this data. </p><p>The following conditions are included (for both the inlet and the centre of the channel):</p><p>Re = 474, T_in,set = 0.5</p><p>Re = 474, T_in,set = 5.0</p><p>Re = 474, T_in,set = 10.0</p><p>Re = 474, T_in,set = 15.0</p><p>Each folder includes the original two-color LIF ratio-metric data and the temperature recordings of the cold-plate as well as the inlet, outlet temperatures and the flow rate (TData). The header for the recordings is included in the main dataset which may be used to navigate the columns and select the relevant data.</p><p> </p>
Comparison of Reference Setups for Calibrating Power Transformer Loss Measurement Systems
<p>Data set belonging to the IEEE Trans. Instr. Meas. paper with DOI: <a href="https://doi.org/10.1109/TIM.2018.2879171">10.1109/TIM.2018.2879171</a></p> <p>G. Rietveld, E. Mohns, E. Houtzager, H. Badura, and D. Hoogenboom,<br> <em>Comparison of Reference Setups for Calibrating Power Transformer Loss Measurement Systems</em></p> <p>This project has received funding from the European Metrology Programme for Innovation and Research co-financed by the Participating States and in part by the European Union’s Horizon 2020 Research and Innovation Programme.</p>
A Novel Integrated Reference-Counter Electrode for Electrochemical Measurements of HOMO and LUMO Levels in Small-Molecule Thin-Film Semiconductors for OLEDs
<p>This dataset <span>includes all raw data, processed data, and analysis scripts necessary to replicate the findings reported in the published paper.</span></p>
Data from: Primary care follow-up and measured mental health outcomes among women referred for ultrasound assessment of pain and/or bleeding in early pregnancy: a quantitative questionnaire study
Objectives To examine the extent of primary care follow-up and mental health outcomes among women referred for ultrasound assessment of pain and/or bleeding in early pregnancy, including those whose pregnancy is found to be viable on ultrasound assessment. Design Questionnaire study with prospective follow-up. Setting Urgent gynaecology clinic in secondary care, England. Participants 57 women participated in the study. Entry criteria: referral to the urgent gynaecology clinic with pain and/or bleeding in early pregnancy; gestation less than 16 weeks (the clinic's own 'cut-off'); no previous attendance at the clinic during the current pregnancy. Exclusion criteria: inability to understand English or to provide informed consent. Primary and secondary outcome measures Incidence of primary care follow-up among women referred to the urgent gynaecology clinic; incidence of women with measured mental health scores suggesting significant symptoms of distress. Results Fewer than 1 in 10 women referred for ultrasound assessment of pain and/or bleeding in early pregnancy had follow-up arrangements made with their general practitioner (GP). Most women who had GP follow-up found it helpful and a significant minority of women who did not have GP follow-up felt that it would have been helpful. Following ultrasound assessment, more than one-third of women had significant symptoms of distress. Symptoms of distress, particularly anxiety, were present among those women found to have viable pregnancies, as well as among those with non-viable pregnancies. Conclusions GPs are advised to consider offering follow-up to all women referred for ultrasound assessment of pain and/or bleeding in early pregnancy. Researchers in this area are advised to consider the experiences of women with pain and/or bleeding in early pregnancy whose pregnancies are ultimately found to be viable on ultrasound scan.
10 MHz reference CW measured same as 5 MHz WWV
<p>This is a supplement to file K4BSE 34.124 -84.203 5 MHz.csv submitted last week, just after the frequency measurement period. I'd wondered about some jumps in frequency error I saw in my earlier submission (see xlxs file attached of the original frequency measurement run), so in this test I measured frequency error in exactly the same way, except that I was measuring a 10 MHz signal from a rubidium stabilized frequency source. The receiver was still stabilized by a GPSDO. I see some similar-magnitude frequency jumps here (note change in vertical scale). Also some frequency drifts is seen between some of the jumps, consistent with frequency drift in the test data submitted previously. I presume the jumps are due to the frequency calibration jumps in the K3's local oscillator. As best I can tell, the frequency of the K3 in the locked mode is determined by measurement of the frequency of an external 10 MHz oscillator, which is then used to calculate a correction to the tuned frequency of the radio. The jumps of a fraction of a Hz are consistent with the stated frequency accuracy of the radio when locked to a good reference (eg., the GPSDO used).</p>
HR Measures From Four Consumer-Grade Optical Heart Rate Sensors with Gold Standard ECG Reference
<p>Accompanying paper that explains data collection, research methods, cleaning etc. is under review as:</p> <p>"Validity of Four Consumer-Grade Optical Heart Rate Sensors for Assessing Volume and Intensity Distribution of Physical Activity"</p> <p>Currently with: Scandinavian Journal of Medicine & Science in Sports TBD, 2024-12-31</p> <p>Four files contain HR data at 1 Hz for each of the devices (Garmin Venu2S and Polar Vantage M2, and the upper arm-worn Polar Verity Sense and Scosche Rhythm24) [device column] paired with medical-grade ECG [ecg column], Type: EP830, Amedtec ECGpro, Aue, Germany</p>
Performance Evaluation of SARS-CoV-2 Viral Transport Medium Produced by Bangladesh Reference Institute for Chemical Measurements
<p>Supplementary Table S1: Stability study design of BRiCM VTM<br> Supplementary Table S2: Stability study result of BRiCM VTM</p>
Reference Values for Videofluoroscopic Measures of Swallowing
ClinicalTrials.gov study NCT05497219. IPD Sharing: NO. Countries: 2. Publications: 0.
Reference Values for Respiratory Resistance Measured by the Interrupter Technique in Adults
ClinicalTrials.gov study NCT00213850. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Measuring Concerns of Cancer Patients Referred to Complementary Medicine Treatment Integrated Within Oncology Service
ClinicalTrials.gov study NCT01860365. IPD Sharing: UNDECIDED. Countries: 1. Publications: 6.
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