Near-field modeling versus optical ray modeling of extended halogen light source in computer design of a reflector

1997 ◽  
Author(s):  
Peter V. Shmelev ◽  
Brij M. Khorana
Keyword(s):  
Light Source ◽  
Near Field ◽  
Computer Design ◽  
Field Modeling ◽  
Halogen Light ◽  
Halogen Light Source

Comparison of the effects of operating microscopes with light emitting diode and halogen light source on the eye: a rabbit study

2021 ◽  
pp. 1-7
Author(s):  
Bahri Aydın ◽  
Armagan Ozgur ◽  
Huseyin Baran Ozdemir ◽  
Pınar Uyar Gocun ◽  
Mehmet Arda Inan ◽  
...  
Keyword(s):  
Light Source ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Halogen Light ◽  
Halogen Light Source

EVALUATION OF AN AUTOMATED COAGULATION ANALYZER

1987 ◽  
Author(s):  
M Johnston ◽  
M Andrew
Keyword(s):  
Thrombolytic Therapy ◽  
Light Source ◽  
Therapy Group ◽  
Screening Tests ◽  
Poor Correlation ◽  
Mean Values ◽  
Halogen Light ◽  
Halogen Light Source ◽  
Scientific Group ◽  
Time Required

The ACL (IL-Automated Coagulation Laboratory from the Fisher Scientific Group) is the first microcentrifugal analyzer incorporating 2 reading channels, a coagulometric channel consisting of a laser light source and a chromogenic channel consisting of a halogen light source. We have evaluated the instrument for precision and accuracy using different reagents for both clotting and the chromogenic assays. Replicate samples were run in both the PT and APTT modes using 4 different reagents. The reagent with the least particles had the greatest precision. The mean values for APTTs and PTs using a particle free reagent were 68.7 ± .83“ for the APTT (C.V. 1.2%), and 30.2 ± .33” (C.V. 1.1%) for the PT. A fibrinogen assay measured on the ACL (delta light scatter of the prothrombin time) was compared to the Clause fibrinogen assay in three population groups: the adult, the newborn and patients receiving thrombolytic therapy. The correlation for the adult and newborn was good with r values of .911 (n = 51) and .96 (n = 36) respectively. The thrombolytic therapy group had poor correlation r = .32. Antithrombin III (ATIII) and a2 antiplasmin (AP) assays were measured on the ACL using IIs chromogenic method. These were compared to an ATIII chromogenic method (Kahle) using a Gilford SBA 300 analyzer and α2 AP assay using a Protopath (Dade). The correlations were ATIII, r=.95 and α2 AP, r=.82. The plasminogen method of Friberger was adapted to the ACL giving us comparable results to those read off the Gilford SBA 300 (r=.93). With the introduction of the ACL we have been able to: 1) reduce the technical time required for assays by one half; 2) reduce reagent costs by one half to three-quarters; 3) reduce the amount of plasma required for screening tests by half the volume, which has greatly facilitated neonatal coagulation testing

scholarly journals Effect of halogene light source on marginal microleakage of resin composite restorations

2010 ◽  
Vol 57 (1) ◽  
pp. 14-20
Author(s):  
Natasa Gajic ◽  
Aleksandra Djeri ◽  
Zeljka Kojic ◽  
Natasa Trtic
Keyword(s):  
Composite Materials ◽  
Light Source ◽  
Resin Composite ◽  
Human Teeth ◽  
Class V ◽  
Composite Restorations ◽  
Halogen Light ◽  
Significant Difference ◽  
Halogen Light Source ◽  
Control Light

Introduction. Although the technology of production resin composite materials has been improved in the past years, polymerization shrinkage and microleakage still remain the main problem of the resin composite restorations. The most important issues are polymerization control, light source choice, quality and polymerization technique. The aim of this study was to evaluate the effect of the halogen light source on the marginal microleakage of the resin composite restorations class V. Material and Methods. The study included 40 extracted human teeth (20 intact and 20 with caries lesion). Class V cavity was prepared in each tooth. The light curing unit used in this study had irradiance 540 mW/cm2. Cavities were restored with the two resin composite materials, Filtek Supreme (3M ESPE) and Luksogal - Galenika. Microleakage was determined using colored solution of 50% silver-nitrate. Results were obtained using stereomicroscope with 6 times magnification. Color penetration was evaluated on the occlusal and gingival wall. Results. Linear color penetration was observed in all cavities restored using Luksogal. There was significant difference (p<0.01) in color penetration between the occlusal (20.30 ?m) and gingival wall (34.00 ?m). Color penetration was shown in all cavities prepared on intact and caries teeth and restored using Filtek Supreme. Also, color penetration on the occlusal wall (13.80 ?m) was significantly lower (p<0.01) than the penetration on the gingival wall (33.00 ?m). Conclusion. All the tested cavities showed marginal leakage, regardless the tooth or material used. Greater microleakage was noticed when Luksogal was used.

scholarly journals NanoLuc Bioluminescence-Driven Photodynamic Activation of Cholecystokinin 1 Receptor with Genetically-Encoded Protein Photosensitizer MiniSOG

2020 ◽  
Vol 21 (11) ◽  
pp. 3763 ◽  
Author(s):  
Yuan Li ◽  
Zong Jie Cui
Keyword(s):  
Singlet Oxygen ◽  
Light Source ◽  
Light Emitting Diode ◽  
Calcium Oscillations ◽  
Entry Site ◽  
Photodynamic Action ◽  
Halogen Light ◽  
Halogen Light Source ◽  
External Light Source

In contrast to reversible activation by agonist, cholecystokinin 1 receptor (CCK1R) is permanently activated by singlet oxygen generated in photodynamic action, with sulphonated aluminium phthalocyanine or genetically encoded mini singlet oxygen generator (miniSOG) as photosensitizer. In these works, a halogen light source was used to power photodynamic action. For possible in vivo application of photodynamic CCK1R physiology, bearing a cumbersome light-delivery device connected to an external light source by experimental animals might interfere with their behavior. Therefore, in the present work, the possibility of bioluminescence-driven miniSOG photodynamic CCK1R activation was examined, as monitored by Fura-2 calcium imaging. In parallel experiments, it was found that, after plasma membrane (PM)-localized expression of miniSOGPM in AR4-2J cells, light irradiation with blue light-emitting diode (LED) (450 nm, 85 mW·cm−2, 1.5 min) induced persistent calcium oscillations that were blocked by CCK1R antagonist devazepide 2 nM. NanoLuc was expressed bicistronically with miniSOGPM via an internal ribosome entry site (IRES) sequence (pminiSOGPM-IRES-NanoLuc). The resultant miniSOGPM-IRES-NanoLuc-AR4-2J cells were found to generate strong bioluminescence upon addition of NanoLuc substrate coelenterazine. Strikingly, coelenterazine 5 microM was found to trigger long-lasting calcium oscillations (a hallmark for permanent CCK1R activation) in perifused miniSOGPM-IRES-NanoLuc-AR4-2J cells. These data indicate that NanoLuc bioluminescence can drive miniSOGPM photodynamic CCK1R activation, laying the foundation for its future in vivo applications.

Far field modeling of the Mamala Bay outfalls

1998 ◽  
Vol 38 (10) ◽  
pp. 323-330
Author(s):  
Philip J. W. Roberts
Keyword(s):  
Field Model ◽  
Near Field ◽  
Far Field ◽  
Field Modeling ◽  
Visitation Frequency ◽  
Statistical Variation ◽  
Long Time ◽  
Harmonic Average ◽  
Ocean Outfall ◽  
Acoustic Doppler Current Profilers

The results of far field modeling of the wastefield formed by the Sand Island, Honolulu, ocean outfall are presented. A far field model, FRFIELD, was coupled to a near field model, NRFIELD. The input data for the models were long time series of oceanographic observations over the whole water column including currents measured by Acoustic Doppler Current Profilers and density stratification measured by thermistor strings. Thousands of simulations were made to predict the statistical variation of wastefield properties around the diffuser. It was shown that the visitation frequency of the wastefield decreases rapidly with distance from the diffuser. The spatial variation of minimum and harmonic average dilutions was also predicted. Average dilution increases rapidly with distance. It is concluded that any impact of the discharge will be confined to a relatively small area around the diffuser and beach impacts are not likely to be significant.

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