scholarly journals Flight to Light Response of Red Pumpkin Beetle (Aulacophora africana Weise) to Differently Coloured Light-emitting Diode and Incandescent Bulb Lights

2019 ◽  
Vol 7 (1) ◽  
pp. 64-69
Author(s):  
Chukwu Alexander Timothy ◽  
Nuhu Samiala ◽  
Emmanuel Okrikata
Keyword(s):  
Light Emitting Diode ◽  
Management Strategies ◽  
Light Response ◽  
Light Traps ◽  
Light Emitting ◽  
Incandescent Bulb ◽  
Randomized Design ◽  
Ordinary Light ◽  
The Difference ◽  
White Colour

Red pumpkin beetle (Aulacophora africana Weise) is an important defoliator and vector of pathogens to its numerous crop hosts. Control had largely been by synthetic insecticides with their attendant consequences on man and the environment thus necessitating scientific studies on environmental-friendly management strategies. The experiment was conducted in the Research Farm of Federal University Wukari in the month of May 2019 with the aim of evaluating the attractiveness of A. africana to Light-emitting diode (LED) and Incandescent Light bulb colours. Five colours (red, yellow, green, blue and white) were used for the study. Each colour light was properly projected on 2 metre vertical screen (made of white polyethene) placed one meter above the ground. A setup without bulb served as the control. The light traps were arranged in a completely randomized design (CRD) in 6 replicates and ran simultaneously for six hours (1800 to 2400hrs). The pumpkin beetles attracted were collected in tubs containing soapy water. A. africana collected were counted and recorded according to bulb type and colour. Samples were identified at the Insect Museum of Ahmadu Bello University, Zaria. Among the Incandescent bulbs, White colour was most attractive to A. africana (4.30±0.38) while red attracted the least (0.71±0.01). Among LED bulbs, Blue was most attractive (3.99±1.01) while Red also attracted the least (0.78±0.03). Overall, LED attracted more pumpkin beetles than Incandescent bulb even though Student Newman Keul’s test indicates that the difference between them was due to random variation (p = 0.16). Correlation and regression analyses indicated increase in insect attraction with increased light intensity. The results, therefore, suggest that white Incandescent or blue LED bulb colours can be incorporated into insecticidal light traps to suppress their population/attract them away from host plants or fixed into ordinary light traps to harvest the insect for scientific studies.

scholarly journals Response of phlebotomine sand flies to light-emitting diode-modified light traps in southern Egypt

2007 ◽  
Vol 32 (2) ◽  
pp. 302 ◽  
Author(s):  
D.F. Hoel ◽  
J.F. Butler ◽  
E. Y. Fawaz ◽  
N. Watany ◽  
S.S. El-Hossary ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Sand Flies ◽  
Light Traps ◽  
Phlebotomine Sand Flies ◽  
Light Emitting

Monitoring and potential control of sea lice using an LED-based light trap

2009 ◽  
Vol 66 (8) ◽  
pp. 1371-1382 ◽  
Author(s):  
Iñigo Novales Flamarique ◽  
Christina Gulbransen ◽  
Moira Galbraith ◽  
Dario Stucchi
Keyword(s):  
Oncorhynchus Tshawytscha ◽  
Light Emitting Diode ◽  
Light Trap ◽  
Sea Lice ◽  
Light Traps ◽  
Light Emitting ◽  
Farmed Salmon ◽  
Potential Control ◽  
Larval Stages ◽  
Salmon Lice

Sea lice are ectoparasitic copepods that threaten salmon farming aquaculture and the viability of wild salmon populations. To control infestations on farmed salmon, several chemotherapeutants have been developed, but these are invasive (often causing fish stress and loss in production), costly, may induce parasite resistance over time, and their impact on the environment is a major social concern. Here, we show that a light-emitting diode (LED)-based light trap can be used to monitor sea lice presence on fish and in the water. The performance of the light trap was tested in experimental tanks and in the ocean. Plankton net tows were also performed to compare catches with those from light traps. The light trap caught ~70% of salmon lice larval stages loaded onto a tank and ~24% of the adults. It also acted as a delousing agent by removing ~8% of adult salmon lice infective on Chinook salmon ( Oncorhynchus tshawytscha ) smolts in tank experiments. In the ocean, the light trap caught 21 sea lice (10 Lepeophtheirus salmonis and 11 Caligus clemensi ), comprising free-swimming and attached stages, while plankton net tows failed to capture any. We conclude that light traps constitute an effective, noninvasive, environmentally friendly method to monitor sea lice.

Color Tunability of Blue Phosphors by Changing Cations for Near-UV InGaN-Based Light-Emitting Diode

2014 ◽  
Vol 986-987 ◽  
pp. 156-159
Author(s):  
Yi Wen Zhu ◽  
Fen Fen Hu ◽  
Mei Li Zhou ◽  
Ping Chen ◽  
Zheng Liang Wang
Keyword(s):  
Uv Light ◽  
Light Emitting Diode ◽  
Blue Emission ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Blue Shift ◽  
Ionic Radii ◽  
Light Emitting ◽  
Triclinic Structure ◽  
The Difference

The serials of blue phosphors, CaAl2Si2O8: Eu2+ doped with different content Sr2+ and Mg2+ ions, were prepared by solid-state reaction at high temperature. And their structure and photo-luminescent properties were investigated. In Ca0.96-ySryAl2Si2O8: 0.04Eu2+ (y = 0.10, 0.30, 0.50, 0.70, 0.90) system, for y ≦ 0.03, all the compositions crystallize in triclinic structure of CaAl2Si2O8, and on further increase of y, the system undergoes a compositionally induced phase transition from triclinic to monoclinic structure. For Ca0.96-yMgyAl2Si2O8: 0.04Eu2+ (y = 0.10, 0.30, 0.50, 0.70, 0.90) system, for z ≦ 0.03, all the compositions are of triclinic structure of CaAl2Si2O8. With the further increase of z, other phase appears. The emission spectra of these phosphors show blue shift with the introduction of Sr2+ ions, and red shift with Mg2+ ions. The reason may be due to the difference ionic radii of Mg2+, Ca2+, Sr2+. These phosphors show excellent blue emission and broad excitation band in near-UV (ultraviolet) range. They may be potential phosphors for near-UV light-emitting diodes (LEDs).

Decreased capture of natural enemies of pests in light traps with light-emitting diode technology

2018 ◽  
Vol 173 (3) ◽  
pp. 251-260 ◽  
Author(s):  
Lei Bian ◽  
Xiao-Ming Cai ◽  
Zong-Xiu Luo ◽  
Zhao-Qun Li ◽  
Zong-Mao Chen
Keyword(s):  
Natural Enemies ◽  
Light Emitting Diode ◽  
Light Traps ◽  
Light Emitting

scholarly journals Usefulness of Light Emitting Diode (LED) fluorescent microscopy as a tool for rapid and effective method for the diagnosis of pulmonary tuberculosis

1970 ◽  
Vol 37 (1) ◽  
pp. 7-10 ◽  
Author(s):  
Z Khatun ◽  
M Kamal ◽  
CK Roy ◽  
T Sultana ◽  
MQ Rahman ◽  
...  
Keyword(s):  
Fluorescence Microscopy ◽  
Pulmonary Tuberculosis ◽  
Light Emitting Diode ◽  
Fluorescent Microscopy ◽  
Infectious Agent ◽  
Sputum Smear ◽  
Light Emitting ◽  
Brightfield Microscopy ◽  
The Difference ◽  
A Prospective Study

Background: Tuberculosis remains world's leading cause of death from a single infectious agent. Fluorescence microscopy offers well-described benefits, comparing with brightfield microscopy, for the evaluation sputum smear samples for tuberculosis. We evaluated the diagnostic performance of fluorescence microscopy, using novel Light Emitting Diode (LED) technology as an alternative to the conventional fluorescence microscopy by Auramine stain as well as brightfield microscopy by Ziehl- Neelsen (ZN) stain.Objectives: The objective of the study was to see the usefulness of LED fluorescent microscopy in the diagnosis of pulmonary tuberculosis.Methods: This is a prospective study consisted of 150 sputum samples from the patients of NIDCH, Mohakhali. All samples were stained by auramine and ZN stain at BSMMU and culture was done in Lowenstein-Jensen (L-J) media as gold standard at NTRL, Mohakhali.Results: In this study total 66(44%) out of 150 sputum specimens were positive for Mycobacterium Tuberculosis by culture. Sensitivity and specificity documented for the different modalities were 95.38% and 94.11%, respectively, for the LED assessment; 68.18% and 90.47%, respectively, for the CFM assessment; and 56.06% and 97.61%, respectively, for brightfield microscopy by ZN stain. The difference in their case detection rate was statistically significant (χ2=119.38, p<0.001).Conclusion: Fluorescence Microscopy (FM) is more sensitive than ZN for diagnosis of pulmonary tuberculosis. However, since FM is more sensitive and rapid, using this method (LED) in clinical laboratories with large specimen numbers is recommended. DOI: http://dx.doi.org/10.3329/bmrcb.v37i1.7792 Bangladesh Med Res Counc Bull 2011; 37: 7 -10

scholarly journals Using Social Marketing to Spur Residential Adoption of ENERGY STAR®-Certified LED Lighting

2015 ◽  
Vol 21 (2) ◽  
pp. 61-78 ◽  
Author(s):  
P. Wesley Schultz ◽  
Julie Colehour ◽  
Jill Vohr ◽  
Lara Bonn ◽  
Ashlee Bullock ◽  
...  
Keyword(s):  
Social Marketing ◽  
Light Emitting Diode ◽  
Lessons Learned ◽  
Control Group ◽  
Light Emitting ◽  
Energy Star ◽  
Led Lighting ◽  
Incandescent Bulb ◽  
Star Program ◽  
Led Lights

Recent technological advancements in lighting have produced light bulbs that are dramatically more efficient than the traditional incandescent bulb. Yet despite these benefits, the marketplace has been slow to adopt these newer and more efficient bulbs. To help facilitate this change, the Environmental Protection Agency’s ENERGY STAR program conducted a series of pilot behavior change campaigns to encourage residents to purchase and install ENERGY STAR-certified light-emitting diode (LED) lights. Campaigns were conducted with Duke Energy and Efficiency Vermont aimed at encouraging residents to purchase and install certified LED lighting in their homes. The campaigns used community-based social marketing (CBSM) as the platform for developing the overarching strategy and were developed to highlight the benefits of certified LED lights and to decrease the barriers. In Vermont, a school-based fund-raiser was used to promote certified LED bulbs, and in North Carolina, special in-store lighting events were held at Home Depot and Costco retail locations. Both programs were implemented using a control group, and quantitative outcomes were tracked. Reported results highlight the increase in sales of certified LEDs associated with the campaigns. Survey data are also reported from participants in the two campaigns, along with tests for spillover of the newly adopted behavior into other lighting purchases and behaviors. The lessons learned from these two CBSM pilots are synthesized into turnkey materials that can be adopted by other organizations looking to promote the adoption of LED lights.

scholarly journals The effects of LED light spectrum manipulation on growth and color performance of giant gourami Osphronemus gouramy Lacepede Padang strain

2022 ◽  
Vol 21 (1) ◽  
pp. 11-21
Author(s):  
Bambang Kusmayadi Gunawan ◽  
Kukuh Nirmala ◽  
Dinar Tri Soelistyowati ◽  
Daniel Djokosetiyanto ◽  
Wildan Nurussalam
Keyword(s):  
Light Emitting Diode ◽  
Emission Spectra ◽  
Control Treatment ◽  
Light Spectrum ◽  
Light Emitting ◽  
Blue Led ◽  
Pectoral Fins ◽  
Randomized Design ◽  
Red Led ◽  
Effect Of Light

This study aimed to evaluate the effect of light spectrum on growth and color performance of giant giant gourami Padang strain. The experiment used a completely randomized design (RAL) with four light emitting diode (LED) treatments in  different emission spectra (white, red, green, and blue) at 550 Lux intensity, compared to the control treatment (light room with white tubular lamp at 50 Lux intensity). The irradiation was carried out for 12 hours of photoperiod. The fish used had the total length of 82.90±4.2 mm and body weight of 9.87 ± 0.99 g. The highest growth performance was found in blue LED treatment with the specific growth rate of  2.73 ± 0.2% and feed efficiency of 86.26 ± 2.71%. The best color performance was found in red LED treatment with the RGB ratio of 44.57 ± 0.62% in dorsal fin, 38.41 ± 1.36% in pectoral fins, and 45.33 ± 2.25% in anal fin with the chromatophore cell concentration at 1.973±58 cells/mm2.   Keywords : Osphronemus gouramy, blue LED, spectrum, chromatophore, light   ABSTRAK   Penelitian ini bertujuan untuk mengevaluasi pengaruh spektrum cahaya terhadap kinerja pertumbuhan dan warna ikan gurami strain Padang. Rancangan penelitian yang digunakan adalah rancangan acak lengkap (RAL) dengan 4 perlakuan cahaya lampu light emitting diodes (LED)  yang memiliki spektrum panjang gelombang berbeda (putih, merah, hijau dan biru) intensitas 550 Lux dan kontrol (cahaya ruang berasal dari lampu tubular putih intensitas 50 Lux). Penyinaran dilakukan selama 12 jam mengikuti fotoperiod. Ikan uji yang digunakan memiliki panjang total 82,90 ± 4,2 mm, dengan bobot 9,87 ± 0,99 g. Kinerja pertumbuhan terbaik terdapat pada perlakuan LED biru dengan laju pertumbuhan spesifik sebesar 2,73 ± 0,2% dan efisiensi pakan sebesar 86,26 ± 2,71%. Performa warna terbaik terdapat pada perlakuan LED merah dengan rasio warna merah pada RGB bagian dorsal sebesar 44,57 ± 0,62%, sirip pektoral sebesar 38,41 ± 1,36%, dan sirip anal sebesar 45,33 ±  2,25% dengan jumlah sel kromatofor sebanyak 1973 sel/mm2.   Kata kunci : Osphronemus gouramy, LED biru, spektrum, kromatofor, cahaya        

scholarly journals Structural, electrical and luminescent characteristics of ultraviolet light emitting structures grown by hydride vapor phase epitaxy

2016 ◽  
Vol 19 (2) ◽  
pp. 75-86
Author(s):  
A. Y. Polyakov ◽  
Jin-Hyeon Yun ◽  
A. S. Usikov ◽  
E. B. Yakimov ◽  
N. B. Smirnov ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Strain Relaxation ◽  
Luminescent Properties ◽  
Vapor Phase Epitaxy ◽  
Hydride Vapor Phase Epitaxy ◽  
Structural Quality ◽  
Light Emitting ◽  
The Difference

Electrical and luminescent properties of near−UV light emitting diode structures (LEDs) prepared by hydride vapor phase epitaxy (HVPE) were studied. Variations in photoluminescence and electroluminescence efficiency observed for LEDs grown under nominally similar conditions could be attributed to the difference in the structural quality (dislocation density, density of dislocations agglomerates) of the GaN active layers, to the difference in strain relaxation achieved by growth of AlGaN/AlGaN superlattice and to the presence of current leakage channels in current confining AlGaN layers of the double heterostructure.

scholarly journals Effects of Different Light Curing Units/Modes on the Microleakage of Flowable Composite Resins

2008 ◽  
Vol 02 (04) ◽  
pp. 240-246 ◽  
Author(s):  
A. Ruya Yazici ◽  
Cigdem Celik ◽  
Berrin Dayangac ◽  
Gul Ozgunaltay
Keyword(s):  
Light Emitting Diode ◽  
In Vitro Study ◽  
Composite Resins ◽  
Light Emitting ◽  
Flowable Composite ◽  
Group I ◽  
Halogen Light ◽  
Light Curing ◽  
The Difference

Objectives: The aim of this in vitro study was to evaluate the influence of different light curing units and modes on microleakage of flowable composite resins.Methods: Eighty Class V cavities were prepared in buccal and lingual surfaces of 40 extracted human premolars with cervical wall located in dentin and the occlusal wall in enamel. These teeth were randomly assigned into two groups (n=20) and restored with different flowable composites; Group I: Esthet-X Flow, Group II: Grandio Flow. Each group was randomly divided into four subgroups; while the samples of the first subgroup were polymerized with conventional Halogen light, the rest of them were polymerized with different curing modes of Light Emitting Diode (LED). The second subgroup was polymerized with fast-curing; the third subgroup with pulse-curing and those of the fourth subgroup with step-curing modes of LED. After the samples were thermocycled and immersed in dye, they were longitudinally sectioned. Dye penetration was assessed under a stereomicroscope. Data were analyzed by Kruskal-Wallis and Mann-Whitney U tests.Results: None of the restorations showed leakage on enamel margins. On dentin margins no significant differences were observed between flowable composite resins polymerized with halogen light (P>.05). While step curing mode of LED presented significant differences between the resins, the difference was insignificant when fast-curing and pulse-curing mode of LED were used. No statistically significant differences were observed between curing units for Esthet-X Flow samples. For Grandio Flow samples, only step-curing mode of LED caused statistically higher leakage scores than halogen and other curing modes of LED (P<.05).Conclusions: The effect of curing units� type and curing mode on flowable composite resin leakage might be material-dependent. (Eur J Dent 2008;2:240-246)

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