scholarly journals Relation between the Natural Light Intensity Profile in the Image Observed at the Bottom of the Water and the Wave Profile

2003 ◽  
Vol 23 (Supplement1) ◽  
pp. 127-130
Author(s):  
Kazuhide Dan ◽  
Kayo Yamamoto ◽  
Aya Nakajima
Keyword(s):  
Light Intensity ◽  
Wave Profile ◽  
Intensity Profile ◽  
Natural Light

scholarly journals POLA PEMANGSAAN LARVA IKAN KAKAP MERAH, Lutjanus sebae

2016 ◽  
Vol 1 (1) ◽  
pp. 49
Author(s):  
Regina Melianawati ◽  
Philip Teguh Imanto ◽  
Made Suastika
Keyword(s):  
Light Intensity ◽  
Feeding Activity ◽  
Feeding Pattern ◽  
Natural Light ◽  
Digestion Time ◽  
Digestion Rate ◽  
Minimum Light ◽  
Intensity Condition

Penelitian ini bertujuan untuk mengetahui pola pemangsaan dari larva ikan kakap merah, L. sebae umur 5 dan 10 hari yang dipelihara dengan kondisi pencahayaan alami. Pengambilan sampel dilakukan setiap satu jam pada masing-masing umur tersebut. Hasil pengamatan menunjukkan bahwa secara alami pola pemangsaan larva L. sebae tergantung pada kondisi pencahayaan, di mana aktivitas pemangsaan berlangsung secara maksimal pada saat tersedia pencahayaan dengan intensitas yang mencukupi untuk larva menangkap mangsanya. Intensitas cahaya minimal yang diperlukan oleh larva L. sebae untuk melakukan pemangsaan berada pada kisaran 400—600 lux. Maksimal pemangsaan satu larva pada umur 5 dan 10 hari adalah 6,2 dan 25,3 individu rotifer. Lama waktu pencernaan larva umur 5 dan 10 hari adalah 4 dan 5 jam, sedangkan laju cerna larva pada masing-masing umur tersebut adalah 1,50 dan 2,76 individu rotifer per jam.The aim of this research was to get the information about the feeding pattern of emperor snapper L. sebae larvae at 5 and 10 days olds reared under natural light intensity. Larvae samples were taken every hour from each age. The result showed that naturally, feeding pattern of emperor snapper larvae depend on the light intensity condition, feeding activity would be done when the light intensity was enough available for supporting larvae to feed. Minimum light intensity that needed by the larvae for feeding activity was range between 400—600 lux. Maximum feeding per larvae at 5 and 10 days olds were 6.2 and 25.3 individual rotifers. Digestion time of larvae at those ages was 4 and 5 hours, while digestion rate were 1.50 and 2.76 individual rotifers per hour.

Light Intensity Profile Control along the Optical Axis with Complex Pupils Implemented onto a Phase-Only SLM

2008 ◽  
Author(s):  
O. López-Coronado ◽  
C. Iemmi ◽  
J. Davis ◽  
J. Campos ◽  
M. J. Yzuel ◽  
...  
Keyword(s):  
Light Intensity ◽  
Optical Axis ◽  
Intensity Profile ◽  
Profile Control

Physiological and ecological studies on the oestrogenic isoflavones in subterranean clover (T. subterraneum L.) III. Effects of light

1967 ◽  
Vol 18 (1) ◽  
pp. 23 ◽  
Author(s):  
RC Rossiter ◽  
AB Beck
Keyword(s):  
Light Intensity ◽  
Subterranean Clover ◽  
Substantial Effect ◽  
The Other ◽  
Light Environment ◽  
Natural Light ◽  
Ecological Studies ◽  
Other Hand ◽  
Isoflavone Content ◽  
Per Se

Isoflavone levels in subterranean clover leaves were higher in 13 hr days of natural daylight than in 6 hr days, but length of photoperiod per se had no substantial effect on these levels. In the field, reduction of light intensity (by shading) to 40% daylight caused no decline in isoflavone levels compared with full daylight; even at 24% daylight the reduction in levels was ill defined. On the other hand, in young seedlings there was a marked fall in isoflavone content, especially in the unifoliate leaf, as light intensity fell from 950 to 320 f.c. However, appreciable isoflavone formation was found in dark-grown clover seedlings. Possible light reactions connected with the promotion of isoflavone synthesis are discussed. Changes in isoflavone levels resulting from variation in the natural light environment are unlikely to be sufficient to affect "clover disease".

scholarly journals Reflected light intensity profile of two-layer tissues: phantom experiments

2011 ◽  
Vol 16 (8) ◽  
pp. 085001 ◽  
Author(s):  
Rinat Ankri ◽  
Haim Taitelbaum ◽  
Dror Fixler
Keyword(s):  
Light Intensity ◽  
Intensity Profile ◽  
Reflected Light ◽  
Phantom Experiments

scholarly journals ANALISIS PHYSICAL MODEL FOR DAYLIGHT SPACES DENGAN PENDEKATAN AN EXPERIMENTAL-BASED DESIGN

2019 ◽  
Vol 3 (2) ◽  
pp. 174
Author(s):  
Nova Asriana
Keyword(s):  
Light Intensity ◽  
Physical Model ◽  
Design Approach ◽  
Prototype Model ◽  
Natural Light ◽  
Optimal Model ◽  
Natural Lighting ◽  
Modeling Experiment ◽  
The Impact

Abstract:  An experimental-based design; analyze physical model for daylight spaces is an experimental based design approach by using natural lighting. This experiment is based on applied models of skylight conditions in the field. The goal of this study is to identify configurations of model prototype models by using natural lighting optimally, then to describe their natural lighting through draw light and to measure the intensity of light through photometry. The results of this modeling experiment are several configurations that form the optimal model ing by using natural light through how much light intensity can get into a room. The prototype model is sized 7.2m x 8.4m x 5m by performing several configurations. The configuration alternatives include ten roof configuration, wall opening and type of material used. Based on the results of experiments, the characteristics of the intensity of natural light that get into a room are strongly influenced by the size and position of the opening area. In addition, using clerestory provides greater light intensity than using vertical windows. The impact of the intensity of the light is increasing a good visual interest for users.Keyword: physical model, natural lighting, daylight spaceAbstrak: An experimental-based design; analyze physical model for daylight spaces merupakan sebuah pendekatan perancangan berbasis eksperimen melalui pemanfaatan pencahayaan alami. Eksperimen ini berbasis model terapan terhadap kondisi skylight di lapangan. Tujuannya adalah untuk mengidentifikasi konfigurasi – konfigurasi model prototipe maket yang memanfaatkan pencahayaan alami secara optimal, kemudian menggambarkan pencahayaan alaminya (draw light) dan melakukan pengukuran intensitas cahaya melalui photometry. Hasil dari eksperimen permodelan ini adalah beberapa konfigurasi bentukan model yang optimal dalam pemanfaatan cahaya alami melalui seberapa banyak intensitas cahaya yang dapat masuk ke dalam suatu ruangan. Prototipe model maket yang digunakan berukuran 7.2m x 8.4m x 5m dengan melakukan beberapa konfigurasi. Alternatif konfigurasi yang digunakan pada eksperimen ini yakni konfigurasi bukaan atap, bukaan dinding dan jenis material yang digunakan sebanyak sepuluh konfigurasi. Berdasarkan hasil dari eksperimen yang dilakukan, bahwa karakteristik intensitas cahaya alami yang masuk ke dalam suatu ruangan sangat dipengaruhi oleh ukuran dan posisi area bukaan. Selain itu juga, pemanfaatan jendela atap memberikan intensitas cahaya yang lebih besar daripada pemanfaatan jendela vertikal. Dampak dari intensitas cahaya yang masuk ke dalam suatu ruangan juga memberikan peningkatan minat visual ruangan yang cukup bagi pengguna  ruangan tersebut. Kata Kunci: physical model, pencahayaan alami, daylight space,

scholarly journals Effect of photoperiod and light intensity on learning ability and memory formation of the pond snail Lymnaea stagnalis

2020 ◽  
Vol 20 (4) ◽  
Author(s):  
Ahmed A. A. Hussein ◽  
El-Sayed Baz ◽  
Janine Mariën ◽  
Menerva M. Tadros ◽  
Nahla S. El-Shenawy ◽  
...  
Keyword(s):  
Light Intensity ◽  
Learning And Memory ◽  
Lymnaea Stagnalis ◽  
Memory Formation ◽  
Day Length ◽  
Learning Ability ◽  
Pond Snail ◽  
Natural Light ◽  
Abiotic Factor ◽  
Term Memory

AbstractNatural light is regarded as a key regulator of biological systems and typically serves as a Zeitgeber for biological rhythms. As a natural abiotic factor, it is recognized to regulate multiple behavioral and physiological processes in animals. Disruption of the natural light regime due to light pollution may result in significant effects on animal learning and memory development. Here, we investigated whether sensitivity to various photoperiods or light intensities had an impact on intermediate-term memory (ITM) and long-term memory (LTM) formation in the pond snail Lymnaea stagnalis. We also investigated the change in the gene expression level of molluscan insulin-related peptide II (MIP II) is response to the given light treatments. The results show that the best light condition for proper LTM formation is exposure to a short day (8 h light) and low light intensity (1 and 10 lx). Moreover, the more extreme light conditions (16 h and 24 h light) prevent the formation of both ITM and LTM. We found no change in MIP II expression in any of the light treatments, which may indicate that MIP II is not directly involved in the operant conditioning used here, even though it is known to be involved in learning. The finding that snails did not learn in complete darkness indicates that light is a necessary factor for proper learning and memory formation. Furthermore, dim light enhances both ITM and LTM formation, which suggests that there is an optimum since both no light and too bright light prevented learning and memory. Our findings suggest that the upsurge of artificial day length and/or night light intensity may also negatively impact memory consolidation in the wild.

Third harmonic generation in ZnO semiconductor using the simplified bond hyperpolarizability model

2018 ◽  
Vol 27 (03) ◽  
pp. 1850025 ◽  
Author(s):  
Hendradi Hardhienata ◽  
Ignu Priyadi ◽  
Bayti Nurjanati ◽  
Husin Alatas
Keyword(s):  
Light Intensity ◽  
Harmonic Generation ◽  
Rotation Angle ◽  
Third Harmonic Generation ◽  
Intensity Profile ◽  
Wurtzite Structure ◽  
Third Harmonic ◽  
Rank Tensor ◽  
Zno Semiconductor

We describe the fourth rank tensor and the related third harmonic generation (THG) light intensity profile in a (0002) wurtzite structure using the simplified bond hyperpolarizability model (SBHM). We show that the resulting THG intensity is isotropic e.g., does not depend on the azimuthal rotation angle of the material. Assuming that THG inside wurtzite structures are dominated solely by bulk dipoles, only one fitting parameter in terms of the effective THG hyperpolarizability is required to generate the Rotational Anisotropy THG (RATHG) experiment result.

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