Influence of ambient temperature on the Ektachem DT60 results for total bilirubin and total protein.

1987 ◽  
Vol 33 (1) ◽  
pp. 138-139 ◽  
Author(s):  
B C Dujardin ◽  
J C Hafkenscheid ◽  
A F Roijers ◽  
M Schoorl ◽  
J van der Ven-Jongekrijg
Keyword(s):  
Clinical Trial ◽  
Ambient Temperature ◽  
Total Protein ◽  
Room Temperature ◽  
Total Bilirubin ◽  
Fixed Temperature ◽  
Calibration Period ◽  
Ambient Temperatures ◽  
Different Temperatures ◽  
Protein Assays

Abstract We evaluated the Kodak Ektachem DT60 analyzer with the DTE module in a two-month clinical trial before its introduction in the Netherlands. At ambient temperatures that differed from that at which the DT60 was calibrated, aberrant behavior for total bilirubin and total protein assays was observed. At subnormal temperatures the former gave higher results than expected, and the latter, lower results. We found a similar effect for total protein determined by the manual biuret reaction at different temperatures, when results were calculated from calibration at a fixed temperature. Total bilirubin assayed by the manual diazobilirubin method showed no such effect. Although the DT60 analyzer is equipped with a temperature-regulated incubator, we conclude that the manufactures's recommended room temperature range for these assays should be narrowed and the three-month calibration period adjusted according to external circumstances.

Change in the Properties of a Lead-acid Battery Depending on the Cycling Speed and the Ambient Temperature

2021 ◽  
Vol 105 (1) ◽  
pp. 119-134
Author(s):  
Jana Zimáková ◽  
Petr Baca ◽  
Martin Langer ◽  
Tomáš Binar
Keyword(s):  
Ambient Temperature ◽  
High Temperatures ◽  
Room Temperature ◽  
Lead Acid Battery ◽  
Ambient Temperatures ◽  
Lead Acid Batteries ◽  
Temperature Dependences ◽  
Cycling Speed ◽  
Lead Acid

This work deals with lead-acid batteries, their properties and individual types that are available on the market. The temperature dependences of the battery parameters at different ambient temperatures and at different discharging and charging modes are measured. 6 batteries are tested at different charging currents, which provides information about their behavior both during discharge and at the time of charging. During the experiments, testing is not only performed at room temperature, but the batteries are also exposed to high temperatures up to 75 °C.

Computational Investigation of Diesel Combustion and Soot Formation With a Phenomenological Soot Model Under Different Temperatures in a Constant Volume Chamber

2014 ◽  
Author(s):  
Zhichao Zhao ◽  
Chia-Fon Lee ◽  
Yawei Chi ◽  
Jingping Liu
Keyword(s):  
Ambient Temperature ◽  
Soot Formation ◽  
Constant Volume ◽  
Diffusion Combustion ◽  
Soot Emission ◽  
Ambient Temperatures ◽  
Constant Volume Chamber ◽  
Constant Volume Combustion Chamber ◽  
Different Temperatures ◽  
Soot Model

The previous nine-step phenomenological soot model was revised by including the oxidation effect on soot number density. Using KIVA-3V Release 2 code coupled with this revised phenomenological soot model, multi-dimensional computational fluid dynamics (CFD) simulations of diesel spray combustion in a constant volume chamber was conducted to investigate the combustion physics and soot emission characteristics. Meanwhile, experiments were conducted in an optical constant volume combustion chamber under different ambient temperatures (800, 900, 1000 K), from which the combustion characteristics and soot distributions were obtained for validation. The results indicate that ignition retards with the decrease of ambient temperature, which results in more air-fuel mixing controlled diffusion combustion at high ambient temperature, and more premixed combustion at low ambient temperature. The corresponding soot formation and distribution shows that the soot emission is strongly related to the local equivalence ratio, which leads to lower soot emission in the lower initial temperature case with more homogeneous mixture. Compared to previous nine-step model, the revised model predicted lower soot number and bigger soot particles size.

New Approach for Analyzing Solar Collectors Subjected to Unequal Front/Rear Ambient Temperatures: The Equivalent Ambient Temperature Concept, Part 2: Validation and Implications for Design

2002 ◽  
Vol 124 (3) ◽  
pp. 268-275 ◽  
Author(s):  
Kam T. K. Ho ◽  
Dennis L. Loveday
Keyword(s):  
Ambient Temperature ◽  
Experimental Work ◽  
Solar Collector ◽  
Solar Simulator ◽  
New Approach ◽  
Ambient Temperatures ◽  
Solar Air Collector ◽  
Different Temperatures ◽  
Traditional Approaches ◽  
Temperature Concept

An approach based on a new conceptual temperature termed the “equivalent ambient temperature” has been introduced for analyzing solar collector thermal performances when the environments to the front and rear of a collector are at different temperatures. Using a specially-designed solar simulator, experimental work is presented which validates the new approach as applied to a wall-integrated covered profiled metal solar air collector. Using both the new and traditional approaches, collector thermal performances are predicted to reveal the practical conditions for which use of the new approach is warranted. The latter findings will be of importance to designers. Performance characteristics for this collector geometry are also presented for use by designers.

593 Ambient Room Temperature in a Burn Intensive Care Unit - A Quality Improvement Project

2020 ◽  
Vol 41 (Supplement_1) ◽  
pp. S139-S140 ◽  
Author(s):  
Alan D Rogers ◽  
Robert Cartotto ◽  
George Ho
Keyword(s):  
Ambient Temperature ◽  
Room Temperature ◽  
Patient Room ◽  
Evaporative Water ◽  
Improvement Project ◽  
Ambient Temperatures ◽  
Ambient Room Temperature ◽  
Medical Order ◽  
Mobile Smartphone ◽  
Observation Period

Abstract Introduction In patients with burns > 20% TBSA, hypermetabolism, evaporative water loss, infection risk and discomfort are all amplified by exposure to cold ambient temperatures. Post-operative patient hypothermia is also detrimental. It is essential to not only maintain a warm patient room temperature, but also to be able to rapidly increase room temperature in the burn ICU. The purpose of this study was to measure typical patient room temperatures in a burn ICU at an adult regional ABA-verified burn center, and to evaluate our ability to intervene and raise room temperature. Methods The ambient temperatures of nine patient rooms were recorded from 14 June to 14 August, 2019. Temperature was measured every minute by a wall-mounted smart sensor placed at standardized positions away from windows or electronic equipment. All devices were tested prior to use, with temperature and humidity accurate and standardized to < 0.2oC and 2% respectively at 18-25oC. Data was transmitted to a mobile smartphone. On 15 August 2019 all room temperatures were manually adjusted to ‘maximum’. This was identified as a sound change initiative, and replicated a potential medical order to increase the ambient temperature should a hypothermic patient be imminently returning from the operating room or resuscitation area after admission. Results Over the baseline observation period (Figure 1) the mean ± SD room temperature was 23.3 ± 1oC. Temperatures deviated below a mean of 22oC during 166 hours per room (11.5%, range 3–362). Following the intervention on 15 August (Figure 2), ambient temperature increased minimally in 6/9 rooms and only by 2–3°C in two rooms (mean rise of 1.03oC; range -0.88oC to 3.26oC). Conclusions The burn ICU rooms are relatively cold and our ability to raise ambient temperature quickly is limited. Further QI change ideas include: 1) a facility engineering assessment 2) set alarms on the smart sensors to alert staff when room temperature falls below a designated threshold. Applicability of Research to Practice This project has identified an important future QI initiative to maintain warm ambient patient room temperatures in the burn ICU.

scholarly journals Cyclic fatigue resistance of HyFlex EDM, Reciproc Blue, WaveOne Gold, and Twisted File Adaptive rotary files under different temperatures and ambient conditions

2019 ◽  
Vol 13 (3) ◽  
pp. 166-171
Author(s):  
Mustafa Gündoğar ◽  
Taha Özyürek ◽  
Koray Yılmaz ◽  
Gülşah Uslu
Keyword(s):  
Ambient Temperature ◽  
Fatigue Resistance ◽  
Room Temperature ◽  
Adaptive Methods ◽  
Cyclic Fatigue ◽  
Radius Of Curvature ◽  
Ambient Conditions ◽  
Significant Difference ◽  
Different Temperatures ◽  
Inner Diameter

Background. This study examined the effects of changes in temperature and environmental conditions on the cyclic fatigue resistance of Reciproc Blue, HyFlex EDM, WaveOne Gold, and Twisted File Adaptive. Methods. Forty-five Reciproc Blue (25/.08), 45 HyFlex EDM (25/.08), 45 WaveOne Gold (25/.07), and 45 Twisted File Adaptive (25/.08) files were tested for cyclic fatigue at room temperature (20°C) in air and water and at body temperature (35°C) in water. All the instruments were rotated in artificial canals made of stainless steel with an inner diameter of 1.5 mm, 60° angle of curvature and a radius of curvature of 5 mm until fracture occurred; the time to fracture was recorded in seconds, using a digital chronometer. Mann-Whitney U test was used for the statistical analysis of data, with SPSS 21.0. Results. Cyclic fatigue resistance was significantly higher in all the groups in water at an ambient temperature of 20°C compared with air and water at temperatures of 20°C and 35°C, respectively (P<0.05). The intragroup analysis revealed that HyFlex EDM had the highest cyclic fatigue resistance, followed by Reciproc Blue, WaveOne Gold, and Twisted File Adaptive in both air and water at 20°C (P<0.05). HyFlex EDM exhibited the highest cyclic fatigue resistance in water at 35°C, whereas there was no significant difference between the other groups (P>0.05). Conclusion. Within the limitations of the present study, an increase in the ambient temperature significantly decreased the cyclic fatigue resistance of the tested NiTi files.

Effect of Growth Conditions on the Cathodoluminescence of β-Ga2O3 Crystals Grown by Electric Current Heating Method

2006 ◽  
Vol 301 ◽  
pp. 181-184 ◽  
Author(s):  
Kenichi Suzuki ◽  
Yuichiro Kuroki ◽  
Tomoichiro Okamoto ◽  
Masasuke Takata
Keyword(s):  
Ambient Temperature ◽  
Electric Current ◽  
Gallium Oxide ◽  
Room Temperature ◽  
Blue Emission ◽  
Growth Conditions ◽  
Ultraviolet Emission ◽  
Heating Method ◽  
Effective Factors ◽  
Ambient Temperatures

Beta gallium oxide (β-Ga2O3) crystals were grown on β-Ga2O3 ceramics heated by electric current under vacuum at various ambient temperatures. From cathodoluminescence at room temperature, emission peaks at 2.9 and 3.5 eV were clearly observed. With increasing ambient temperature, the relative intensity of ultraviolet emission (3.5 eV) to blue emission (2.9 eV) showed a peak at 400oC. These results suggest that the ambient temperature during the electric current heating of β-Ga2O3 ceramics in vacuum is one of the most effective factors for the ultraviolet emissive β-Ga2O3 crystal.

scholarly journals Effect of Elevated Ambient Temperature on Simulator-Derived Oscillometric Blood Pressure Measurement

2020 ◽  
Author(s):  
Jennifer S Ringrose ◽  
Michael D Kennedy ◽  
Jalisa Kassam ◽  
Omar Mouhammed ◽  
Sangita Sridar ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Elevated Temperature ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Blood Pressure Measurement ◽  
Ambient Temperatures ◽  
Oscillometric Blood Pressure Measurement ◽  
Increasing Temperature ◽  
Relative Differences

Abstract BACKGROUND Oscillometric blood pressure (BP) devices are typically labeled for use up to 40 °C. Many geographic regions have ambient temperatures exceeding 40 °C. We assessed the effect of increased ambient temperature (40–55 °C) on simulator-derived oscillometric BP measurement. METHODS Three Omron BP769CAN devices, 3 A&D Medical UA-651BLE devices, and accompanying cuffs were used. A custom heat chamber heated each device to the specified temperature. A noninvasive BP simulator was used to take 3 measurements with each device at differing temperatures (22, 40, 45, 50, and 55 °C) and BP thresholds: 80/50, 100/60, 120/80, 140/90, 160/110, and 180/130 mm Hg. Using each device as its own control (22 °C), we determined the relative differences in mean BP for each device at each temperature and BP setting, assessed graphical trends with increasing temperature, and examined variability. RESULTS Graphical trends of mean simulator-subtracted BP differences from room temperature showed no discernable pattern, with differences clustered around zero. Overall mean difference in BP (combined elevated temperatures minus room temperature) was −0.8 ± 2.1 (systolic ± SD)/1.2 ± 3.5 (diastolic ± SD) mm Hg for the A&D device and 0.2 ± 0.4 (systolic ± SD)/−0.1 ± 0.1 (diastolic ± SD) mm Hg for the Omron. All individual elevated temperature differences (elevated temperature minus room temperature) except A&D diastolic BP at 50 °C were within 5 mm Hg. CONCLUSIONS In this simulator-based study assessing within-device differences, higher ambient temperatures resulted in oscillometric BP measurements that were comparable to those performed at room temperature.

Effect of temperature on structure, morphology and crystallinity of PVDF nanofibers via electrospinning

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Fenglin Huang ◽  
Qufu Wei ◽  
Jiaxi Wang ◽  
Yibing Cai ◽  
Yubo Huang
Keyword(s):  
Thermal Properties ◽  
Ambient Temperature ◽  
Vinylidene Fluoride ◽  
Effect Of Temperature ◽  
Scanning Calorimetry ◽  
Ambient Temperatures ◽  
Force Microscopy ◽  
Poly Vinylidene Fluoride ◽  
Different Temperatures ◽  
Surface Morphologies

Abstract Influence of temperature on morphology, structure and crystallinity of Poly (vinylidene fluoride) (PVDF) nanofibers was investigated in this study. The Wehilmy technique and viscosity testing apparatus were used to evaluate the surface tension and viscosity of electrospun solutions at various ambient temperatures. Surface morphologies and diameters of nanofibers were examined by Field-emission Scanning Electron Microscopy (FE-SEM) and atomic force microscopy (AFM). It was found that the surface morphologies were obviously affected by ambient temperature. This dependence was attributed to the change of the properties of Poly (vinylidence fluoride) solutions with temperature. The thermal properties and crystal structures of the PVDF nanofibers electrospun at different temperatures were also studied by differential scanning calorimetry (DSC), and Xray diffraction (XRD). The results revealed that the crystallinity and thermal properties were improved by increasing the ambient temperature during electrospinning

Formation of Dislocation Channels in Neutron Irradiated Molybdenum

1972 ◽  
Vol 30 ◽  
pp. 672-673
Author(s):  
S. Mahajan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Channel Formation ◽  
Early Stages ◽  
Transmission Electron ◽  
Three Stages ◽  
Two Stages ◽  
Polycrystalline Molybdenum

The evolution of dislocation channels in irradiated metals during deformation can be envisaged to occur in three stages: (i) formation of embryonic cluster free regions, (ii) growth of these regions into microscopically observable channels and (iii) termination of their growth due to the accumulation of dislocation damage. The first two stages are particularly intriguing, and we have attempted to follow the early stages of channel formation in polycrystalline molybdenum, irradiated to 5×1019 n. cm−2 (E > 1 Mev) at the reactor ambient temperature (∼ 60°C), using transmission electron microscopy. The irradiated samples were strained, at room temperature, up to the macroscopic yield point.Figure 1 illustrates the early stages of channel formation. The observations suggest that the cluster free regions, such as A, B and C, form in isolated packets, which could subsequently link-up to evolve a channel.

Comparative Labelling and Biokinetic Studies of 99mTc-EDTA(Sn) and 99mTc-DTPA(Sn)

1977 ◽  
Vol 16 (01) ◽  
pp. 30-35 ◽  
Author(s):  
N. Agha ◽  
R. B. R. Persson
Keyword(s):  
Complex Formation ◽  
Significant Influence ◽  
Room Temperature ◽  
Ph Value ◽  
Maximum Activity ◽  
Reduction Step ◽  
Labelling Yield ◽  
Different Temperatures ◽  
Kinetics Of

SummaryGelchromatography column scanning has been used to study the fractions of 99mTc-pertechnetate, 99mTcchelate and reduced hydrolyzed 99mTc in preparations of 99mTc-EDTA(Sn) and 99mTc-DTPA(Sn). The labelling yield of 99mTc-EDTA(Sn) chelate was as high as 90—95% when 100 μmol EDTA · H4 and 0.5 (Amol SnCl2 was incubated with 10 ml 99mTceluate for 30—60 min at room temperature. The study of the influence of the pH-value on the fraction of 99mTc-EDTA shows that pH 2.8—2.9 gave the best labelling yield. In a comparative study of the labelling kinetics of 99mTc-EDTA(Sn) and 99mTc- DTPA(Sn) at different temperatures (7, 22 and 37°C), no significant influence on the reduction step was found. The rate constant for complex formation, however, increased more rapidly with increased temperature for 99mTc-DTPA(Sn). At room temperature only a few minutes was required to achieve a high labelling yield with 99mTc-DTPA(Sn) whereas about 60 min was required for 99mTc-EDTA(Sn). Comparative biokinetic studies in rabbits showed that the maximum activity in kidneys is achieved after 12 min with 99mTc-EDTA(Sn) but already after 6 min with 99mTc-DTPA(Sn). The long-term disappearance of 99mTc-DTPA(Sn) from the kidneys is about five times faster than that for 99mTc-EDTA(Sn).

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