scholarly journals The Two-Level Semi-Synchronous Parallelization Method for the Caustic and Indirect Luminance Calculation in Realistic Rendering

2020 ◽  
pp. paper7-1-paper7-12
Author(s):  
Andrey Zhdanov ◽  
Dmitry Zhdanov
Keyword(s):  
Ray Tracing ◽  
The Other ◽  
Data Synchronization ◽  
Realistic Rendering ◽  
Low Level ◽  
Upper Level ◽  
Access To Data ◽  
Original Approach ◽  
Indirect Illumination ◽  
Special Algorithm

The paper considers an original approach to the semi-synchronous calculation of the luminance of caustic and indirect illumination for the group of methods based on the bidirectional stochastic ray tracing with backward pho-ton maps. The designed parallelization method uses the two-level threads hierarchy. The low level of this thread hierarchy is synchronous calculations of the part of the whole image defined by a randomly generated pixel mask which is applied to the whole image. The top level is semi-synchronous parallelization level that consists groups of the low level threads which of them calculate own part of the whole image in a way similar to asynchronous calculations. As the top level is semi-synchronous it means that when calculating the luminance of the caustic and indirect illumination, the threads of the low level have access to the data accumulated in the backward photon maps of the other parallel threads of the semi-synchronous level. A special algorithm for organizing an access to data of the upper-level threads avoids de-lays associated with data synchronization. The comparison of the developed solution with purely synchronous and asynchronous parallelization methods is presented.

scholarly journals Climatology of Barrier Jets along the Alaskan Coast. Part II: Large-Scale and Sounding Composites

2006 ◽  
Vol 134 (2) ◽  
pp. 454-477 ◽  
Author(s):  
Brian A. Colle ◽  
Kenneth A. Loescher ◽  
George S. Young ◽  
Nathaniel S. Winstead
Keyword(s):  
Large Scale ◽  
Warm Season ◽  
Yukon Territory ◽  
The Other ◽  
Cool Season ◽  
Low Level ◽  
Alaskan Coast ◽  
Sar Imagery ◽  
Upper Level ◽  
Barrier Jets

Abstract This paper investigates the large-scale flow and thermodynamic structures associated with barrier jets along the Alaskan coast using the National Centers for Environmental Prediction (NCEP) reanalysis, as well as the average wind, moisture, and thermodynamic soundings at Yakutat, Alaska (YAK), and Whitehorse, Yukon Territory, Canada (YXY). Large-scale and sounding composites are constructed for all barrier jets objectively identified around YAK using synthetic aperture radar (SAR) imagery during the cool and warm seasons of 1998–2003. During the cool season the jet events are separated into those with sharp upstream wind gradients (shock jets), highly variable (“gustlike”) surface winds (variable jets), and the other jet events (other jets). Those cool season barrier jets without shock or variable characteristics are associated with an anomalously deep upper-level trough approaching the Gulf of Alaska and an anomalous ridge over western Canada and interior Alaska. The associated surface cyclone and surface ridging result in strong low-level southerlies over southeast Alaska and the advection of 850-mb warm anomalies northward from the subtropics to Alaska. In contrast, the shock events have significant cold anomalies at 850 mb over the interior, while both the shock and variable jets have less upper-level ridging over the interior. The warm season other-jet composite is similar to that for the cool season, except that an 850-mb cool anomaly develops near the coast and the approaching upper-level trough is not significantly deeper than climatology. The sounding composite at YAK of the other-jet type during the cool season is more stable, moist, and slightly cooler at lower levels than the nonjet events. The largest low-level cool, dry, and high stability anomalies are for the shock events at YAK and YXY, which suggests that this cold and dry air source over the interior is an important ingredient for the development of sharp frontlike boundaries to the barrier jet. In contrast, the variable jets have weaker low-level stability, which favors the subsequent mixing of higher momentum to the surface in localized areas. The warm season jets also have cooler lower levels than those for the nonjet events, but the lower levels are nearly well mixed with little stratification, especially over the interior.

Meso β-Scale Thunderstorm/Environment Interactions During AVE-SESAME V (20–21 May 1979)

1983 ◽  
Vol 64 (10) ◽  
pp. 1144-1156 ◽  
Author(s):  
Henry E. Fuelberg ◽  
Matthew F. Printy
Keyword(s):  
Lower Stratosphere ◽  
Lower Troposphere ◽  
The Other ◽  
Atmospheric Variability ◽  
Feedback Mechanisms ◽  
Low Level ◽  
Severe Thunderstorms ◽  
Other Hand ◽  
Upper Level ◽  
Rawinsonde Data

Meso β-scale rawinsonde data from the Atmospheric Variability Experiment-Severe Environmental Storms and Mesoscale Experiment (AVE-SESAME) V period (20–21 May 1979) are used to diagnose atmospheric variability in the environment of a convective area. As the storms developed, temperatures increased in the upper stratosphere; however, cooling was observed nearer to the surface and in the lower stratosphere. Height rises above 400 mb produced a mesohigh over the convective area that was most pronounced near 200 mb. Weaker height falls occurred in the lower troposphere. Wind patterns underwent especially interesting fluctuations. North of the convective area, upper-level winds increased significantly during storm development. Southeast of the convection, however, winds near 200 mb decreased approximately 50% during a 3 h period coinciding with the most active storms. On the other hand, winds at 400 mb almost doubled during the same 3 h period. Strong low-level convergence, upper-level divergence, and ascending motion developed after storm initiation. Much more detailed study is required to understand this fascinating case. However, many of the current findings about the meso β-scale storm environment are consistent with those previously attributed to feedback mechanisms from severe thunderstorms.

BIOCHEMICAL STUDIES ON SOCKEYE SALMON DURING SPAWNING MIGRATION: IV. THE NON-PROTEIN NITROGENOUS CONSTITUENTS OF THE MUSCLE

1958 ◽  
Vol 36 (8) ◽  
pp. 833-838 ◽  
Author(s):  
J. D. Wood
Keyword(s):  
Sockeye Salmon ◽  
The Other ◽  
Spawning Migration ◽  
Female Fish ◽  
Male And Female ◽  
Low Level ◽  
Early Stages ◽  
Biochemical Studies

The non-protein nitrogenous constituents of muscle of migrating sockeye salmon were investigated. These constituents were found to be the same in both male and female fish and were present in approximately the same amounts in both sexes. The histidine content of the muscle in all fish decreased to one fifth of the original value during the early stages of the migratory journey and remained at the low level thereafter. Some of the other constituents changed to a smaller extent, usually increasing in the later stages of the migration. This was especially noticeable in female fish. However, the increase in the concentration of these constituents in the muscle was due to a decrease in the amount of muscle in the fish rather than to an increase in the amounts of the compounds themselves.

scholarly journals Evaluation of Resistance Development in Bemisia tabaci Genn. (Homoptera: Aleyrodidae) in Cotton against Different Insecticides

Insects ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 996
Author(s):  
Muhammad Zaryab Khalid ◽  
Sohail Ahmed ◽  
Ibrahim Al-ashkar ◽  
Ayman EL Sabagh ◽  
Liyun Liu ◽  
...  
Keyword(s):  
Bemisia Tabaci ◽  
The Other ◽  
Resistance Development ◽  
Susceptible Population ◽  
Low Level ◽  
Development Of Resistance ◽  
Major Pest ◽  
Selection For ◽  
High Level ◽  
Very High

Cotton is a major crop of Pakistan, and Bemisia tabaci (Homoptera: Aleyrodidae) is a major pest of cotton. Due to the unwise and indiscriminate use of insecticides, resistance develops more readily in the whitefly. The present study was conducted to evaluate the resistance development in the whitefly against the different insecticides that are still in use. For this purpose, the whitefly population was selected with five concentrations of each insecticide, for five generations. At G1, compared with the laboratory susceptible population, a very low level of resistance was observed against bifenthrin, cypermethrin, acetamiprid, imidacloprid, thiamethoxam, nitenpyram, chlorfenapyr, and buprofezin with a resistance ratio of 3-fold, 2-fold, 1-fold, 4-fold, 3-fold, 3-fold, 3-fold, and 3-fold, respectively. However, the selection for five generations increased the resistance to a very high level against buprofezin (127-fold), and to a high level against imidacloprid (86-fold) compared with the laboratory susceptible population. While, a moderate level of resistance was observed against cypermethrin (34-fold), thiamethoxam (34-fold), nitenpyram (30-fold), chlorfenapyr (29-fold), and acetamiprid (21-fold). On the other hand, the resistance was low against bifenthrin (18-fold) after selection for five generations. A very low level of resistance against the field population of B. tabaci, at G1, showed that these insecticides are still effective, and thus can be used under the field conditions for the management of B. tabaci. However, the proper rotation of insecticides among different groups can help to reduce the development of resistance against insecticides.

scholarly journals The Interdecadal Variations and Causes of the Relationship Between Autumn Precipitation Anomalies in Eastern China and SSTA Over the Southeastern Tropical Indian Ocean

2021 ◽  
Author(s):  
Liwei Huo ◽  
Zhaoyong Guan ◽  
Dachao Jin ◽  
Xi Liu ◽  
Xudong Wang ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Eastern China ◽  
Tropical Indian Ocean ◽  
The Other ◽  
Drought Event ◽  
Low Level ◽  
Rainfall Anomalies ◽  
Precipitation Anomalies ◽  
The Relationship ◽  
Southeastern Tropical Indian Ocean

Abstract Eastern China has a large population with rapid development of the economy, where is the important crop producing region. In this region, the spatial and temporal distribution of autumn rainfall in Eastern China is uneven, which has important societal impact. Using the NCEP–NCAR reanalysis and other observational datasets, it is found that the spatial distribution of the first EOF mode of autumn rainfall anomalies in eastern China is consistent across the region, with significant interannual variabilities. Pronounced interdecadal variations are presented in the relationship between autumn rainfall anomalies in eastern China and sea-surface temperature anomalies (SSTA) over the southeastern tropical Indian Ocean (SETIO). The interdecadal changes have been analyzed by considering two epochs: one during 1979-2004 and the other during 2005-2019. It shows weak and insignificant correlations between the autumn rainfall anomalies in eastern China and SSTA over SETIO during the first epoch. On the other hand, they are remarkable and positively correlated with each other during the second epoch. The inter-decadal changes of the above relationship are related to the warming of SST over SETIO during the second epoch. It causes stronger low-level convergence and ascending motion over SETIO, with the co-occurrence of enhanced western Pacific subtropical high and anomalous abundant moisture over eastern China carried by a low-level southerly anomaly originating from the South China Sea. Simultaneously, the local Hadley circulation over eastern China becomes weak, corresponding to the anomalous ascending motion. The collaboration of anomalous water vapour transport and ascending motion strengthens the connection between the SETIO SSTA and the autumn precipitation anomalies in eastern China, and vice versa. In the boreal autumn of 2019, entire eastern China suffered extreme drought. It suggests that this drought event in eastern China is strongly affected by the negative SSTA over SETIO, which is consistent with the statistical results.

scholarly journals Does Activating Cultural Schemata Facilitate EFL Learners' Listening Comprehension?

2018 ◽  
Vol 10 (3) ◽  
pp. 252-260
Author(s):  
Soheil Mahmoudi
Keyword(s):  
Null Hypothesis ◽  
Listening Comprehension ◽  
The Other ◽  
Efl Learners ◽  
Low Level ◽  
Cultural Schemata ◽  
Audio Files ◽  
Iranian Students

This study tried to find the possible relationship between listeners' cultural schemata and its activation and their performance in EFL listening comprehension. The participants of this study were two groups of 37 Muslim Iranian students. Firstly, the students were divided into two groups of high and low proficiency. Then, they were exposed to two audio files, one about mosques and the other about cathedrals. In one of the classes the recording about the cathedrals was played first, but in the other the order was reversed. The collected data were inputted into the SPSS program. The null hypothesis of the study was whether listening to a culturally unfamiliar topic (cathedrals) can activate low-level learners’ schema of the culturally familiar topic (mosques). The hypothesis of the study was accepted implying that an unfamiliar text, even if it is conceptually similar, cannot activate a culturally familiar schema in the low-level students. This study has pedagogical implications for teaching listening comprehension.

scholarly journals Simulasi Kontrol 2 Pompa Supplay Air Bersih Menggunakanrelay Change Over Dan Floatless Level Switch (Sebagai Modul Praktek Mahasiswa Ps Teknik Pendingin Dan Tata Udara)

2018 ◽  
Vol 4 (1) ◽  
pp. 10-16
Author(s):  
Sudirman Sudirman ◽  
I Nyoman Gede Baliarta
Keyword(s):  
Water Level ◽  
Level Control ◽  
Low Level ◽  
Upper Level ◽  
Underground Tank

Sistem supplay air bersih pasti ada dipasang disuatu gedung. Tujuan dari penelitian ini adalah untuk menciptakan modul praktek mahasiswa Program Studi Teknik Pendingin  dalam mata Kuliah Praktek Utility Gedung dan BAS. Sehingga kompetensi mahasiswa tentang utility gedung, khususnya dibidang system pompa supplai air bersih bisa tercapai dengan lebih mudah. Modul praktek ini menggunakan 2 buah pompa, 2 buah tangki air, 1 sebagai tangki sebagai tangki underground tank dan 1 lagi sebagai tower tank. Menggunakan WLC (water level control) untuk mengontrol hidup mati pompa berdasarkan level  air pada tangki tower. Dan menggunakan Relay Change over untuk merubah pompa on duty secara otomatis. Hasil uji kerja alat simulasi ini, saat level air pada tangki tower low level, Pompa 1 akan hidup sampai level air mencapai upper level dan akan Off, secara otomatis Relay change over merubah pompa on duty dari Pompa 1 ke Pompa 2. Pada saat level air mencapai low level lagi di tangki tower, yang hidup adalah Pompa 2.

Théologie de la rédemption et éthique sexuelle: unité et cohérence du ‘développement’ 1 Co 5–7

2018 ◽  
Vol 64 (4) ◽  
pp. 514-531
Author(s):  
Loïc P. M. Berge
Keyword(s):  
The Other ◽  
Close Attention ◽  
Scholarly Literature ◽  
The One ◽  
Literary Unity ◽  
Original Approach ◽  
Concentric Structure

The literary status of 1 Cor 5–7 is diversely considered in scholarly literature. Sometimes these chapters are seen as a stand-alone part of the letter, sometimes they are divided in separate blocks, chapters 5–6 on the one hand and chapter 7 on the other. However, an original approach that pays close attention to the structure of the text makes it possible to show the neat architecture of this larger textual unit. The concentric structure of the three chapters (A–B–A’) highlights their literary unity and stresses the significance of the central chapter, which correspondingly possesses the greatest theological density of the whole section.

The politics of the unities: tragedy and the Risorgimento in Byron and Manzoni

2018 ◽  
Author(s):  
Arnold Anthony Schmidt
Keyword(s):  
Fifteenth Century ◽  
Political Change ◽  
The Other ◽  
The Political ◽  
Political Implications ◽  
The One ◽  
Original Approach

This chapter takes an original approach to Byron’s much-discussed engagement with the early Risorgimento by focusing not on biographical aspects, but rather on formal issues. It centres on The Two Foscari in the context of the highly politicised contemporary Italian critical debates about the dramatic unities. In this fashion, it teases out the political implications of Byron’s adherence to the unities by comparing his play to Alessandro Manzoni’s Il conte di Carmagnola, which programmatically violates them. Focusing specifically on the playwrights’ representations of the fifteenth-century mercenary leader, Francesco Bussone da Carmagnola, the chapter explores these writers’ use or abuse of the unity of time, in particular. In doing so, it throws light on, and contrasts, Manzoni’s Risorgimento agenda on the one hand and Byron’s generally sceptical attitude about leadership and uncertainty about social and political change on the other.

“A Particularly Serious Crime”

2021 ◽  
pp. 158-184
Author(s):  
Elliott Young
Keyword(s):  
United States ◽  
Home Country ◽  
The United States ◽  
The Other ◽  
President Obama ◽  
Felony Conviction ◽  
Low Level ◽  
Serious Crime ◽  
The One ◽  
Radical Shift

Machado was just five years old in 1990 when she was brought to the United States by her mother, who was desperate to escape the civil war raging in their home country of El Salvador; she wanted a better life for her two young daughters. In 2015, she was picked up in a traffic stop in Arkansas which triggered her deportation based on a felony conviction from a decade earlier. Machado’s story reveals a radical shift that had been happening since the mid-1990s. Unprecedented numbers of immigrants were being caught in a system that penalized people with mandatory deportations for relatively low-level crimes. Machado does not fit easily into the Manichean distinction made by President Obama in 2014 between “felons” on the one hand and “families” on the other. Machado, like so many others, is both.

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