The effectiveness of fungicides against blister smut and fusarium on the cobs in growing self-pollinated corn lines

2020 ◽  
Vol 20 (1) ◽  
pp. 85-90
Author(s):  
L.Kh. Azubekov ◽  
◽  
O.H. Shabatukov ◽  
M.S. Dolov ◽  
◽  
...  
Keyword(s):  
Weather Conditions ◽  
Head Smut ◽  
The Stability

In the Stavropol Territory and in the Kabardino-Balkarian Republic of late, the most harmful and dominant diseases of corn are blister smut and fusarium on the cob. It has been established that the most harmful damage to the ears, in which the productivity of plants decreases by 30-50%. Studies carried out in 2018-2019 showed that seed infections are due to a high (54-66%) prevalence of diseases of the ears, such as fusarium, blister and head smut. The severity of the blister smut depends on the stability of the hybrid, the timing of infection, which organ is affected and weather conditions.

Resistance of cherry varieties to spring return frozes in the conditions of Astrakhan region

2020 ◽  
Author(s):  
A.A. Dronic A.A. ◽  
Keyword(s):  
Weather Conditions ◽  
Damage Score ◽  
The Stability ◽  
Almost All ◽  
Total Damage ◽  
Continental Climate ◽  
Unfavorable Weather

The article presents an assessment of the stability of introduced cherry varieties to spring return frosts in 2020 in the conditions of the sharply continental climate of the Astrakhan region. As a result of unfavorable weather conditions, the total damage score of all varieties was 2-5 points. Almost all the studied varieties showed an insufficient level of resistance to recurrent frosts.

scholarly journals Fast-Scale Instability and Stabilization by Adaptive Slope Compensation of a PV-Fed Differential Boost Inverter

2021 ◽  
Vol 11 (5) ◽  
pp. 2106
Author(s):  
Abdelali El Aroudi ◽  
Mohamed Debbat ◽  
Mohammed Al-Numay ◽  
Abdelmajid Abouloiafa
Keyword(s):  
Numerical Simulations ◽  
Full Range ◽  
Weather Conditions ◽  
Current Loop ◽  
Point Tracking ◽  
Bifurcation Phenomena ◽  
Slope Compensation ◽  
Power Point ◽  
The Stability ◽  
Detailed Circuit

Numerical simulations reveal that a single-stage differential boost AC module supplied from a PV module under an Maximum Power Point Tracking (MPPT) control at the input DC port and with current synchronization at the AC grid port might exhibit bifurcation phenomena under some weather conditions leading to subharmonic oscillation at the fast-switching scale. This paper will use discrete-time approach to characterize such behavior and to identify the onset of fast-scale instability. Slope compensation is used in the inner current loop to improve the stability of the system. The compensation slope values needed to guarantee stability for the full range of operating duty cycle and leading to an optimal deadbeat response are determined. The validity of the followed procedures is finally validated by a numerical simulations performed on a detailed circuit-level switched model of the AC module.

scholarly journals Climate Change and Internet of Things Technologies—Sustainable Premises of Extending the Culture of the Amurg Cultivar in Transylvania—A Use Case for Târnave Vineyard

2021 ◽  
Vol 13 (15) ◽  
pp. 8170
Author(s):  
Veronica Sanda Chedea ◽  
Ana-Maria Drăgulinescu  ◽  
Liliana Lucia Tomoiagă  ◽  
Cristina Bălăceanu ◽  
Maria Lucia Iliescu 
Keyword(s):  
Climate Change ◽  
Weather Conditions ◽  
White Wine ◽  
Time Investment ◽  
Protected Designation Of Origin ◽  
Average Annual Temperature ◽  
Insect Infestations ◽  
Long Time ◽  
The Stability ◽  
Red Grape

Known for its dry and semi-dry white wine, the Târnave vineyard located in central Transylvania is challenged by the current climate change, which has resulted in an increase of the period of active vegetation by approximately 15–20 days, the average annual temperature by 1–1.5 °C and also the amount of useful temperatures (useful thermal balance for the grapevine). Furthermore, the frost periods have been reduced. Transylvania is an important Romanian region for grapevine cultivation. In this context, one can use the climatic changes to expand their wine assortment by cultivating an autochthonous grapevine variety called Amurg. Amurg is a red grape cultivar homologated at SCDVV Blaj, which also homologated 7 cultivars and 11 clones. Because viticulture depends on the stability of meteorological and hydrological parameters of the growing area, its foundations are challenged by climate change. Grapevine production is a long time investment, taking at least five years before the freshly planted vines produce the desired quality berries. We propose the implementation of a climate change-based precision viticulture turn-key solution for environmental monitoring in the Târnave vineyard. This solution aims to evaluate the grapevine’s micro-climate to extend the sustainable cultivation of the Amurg red grapes cultivar in Transylvania with the final goal of obtaining Protected Designation of Origin (PDO) rosé and red wines from this region. Worldwide, the changing conditions from the existing climate (a 30-year average), used in the past hundred years to dictate local standards, such as new and erratic trends of temperature and humidity regimes, late spring freezes, early fall frosts, storms, heatwaves, droughts, area wildfires, and insect infestations, would create dynamic problems for all farmers to thrive. These conditions will make it challenging to predict shifts in each of the components of seasonal weather conditions. Our proposed system also aims to give a solution that can be adapted to other vineyards as well.

Assessing the Maximum Stability of the Nonconvective Zone in a Salinity-Gradient Solar Pond

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
A. A. Abdullah ◽  
K. A. Lindsay
Keyword(s):  
Salinity Gradient ◽  
Fluid Velocity ◽  
Weather Conditions ◽  
Convective Zone ◽  
Heat Extraction ◽  
Solar Pond ◽  
Maximum Stability ◽  
Storage Zone ◽  
The Stability

The quality of the stability of the nonconvective zone of a salinity-gradient solar pond (SGSP) is investigated for an operating protocol in which the flushing procedure exactly compensates for evaporation losses from the solar pond and its associated evaporation pond. The mathematical model of the pond uses simplified, but accurate, constitutive expressions for the physical properties of aqueous sodium chloride. Also, realistic boundary conditions are used for the behaviors of the upper and lower convective zones (LCZs). The performance of a salinity-gradient solar pond is investigated in the context of the weather conditions at Makkah, Saudi Arabia, for several thickness of upper convective zone (UCZ) and operating temperature of the storage zone. Spectral collocation based on Chebyshev polynomials is used to assess the quality of the stability of the pond throughout the year in terms of the time scale for the restoration of disturbances in temperature, salinity, and fluid velocity underlying the critical eigenstate. The critical eigenvalue is found to be real and negative at all times of year indicating that the steady-state configuration of the pond is always stable, and suggesting that stationary instability would be the anticipated mechanism of instability. Annual profiles of surface temperature, salinity, and heat extraction are constructed for various combinations for the thickness of the upper convective zone and storage zone temperature.

Effect of the environment on processing and handling materials at sea

1978 ◽  
Vol 290 (1366) ◽  
pp. 161-177 ◽  
Keyword(s):  
Deep Water ◽  
Seasonal Variations ◽  
Deep Sea ◽  
Weather Conditions ◽  
Floating Structure ◽  
Mining Operations ◽  
Waste Products ◽  
The Stability ◽  
Vast Range ◽  
Significant Factors

Compared with conventional land-based mining and processing operations, the exploitation of minerals from the seabed, particularly in deep water, involves a vast range of new problems in conducting the various stages of mining, transportation, processing and disposal of waste products, in a marine environment. In all such operations the ways in which local sea and weather conditions and their seasonal variations affect the stability of the vehicle, be it ship or other floating structure or submersible from which the operations are being conducted, have to be taken into account. The resulting motion together with vibration generated by propulsion and other machinery are significant factors in the performance and behaviour of equipment and materials during processing, handling and transportation operations at sea. In deep-sea mining operations at depths of 2-5 km the effects of associated pressure, salinity and temperature must also be dealt with. The paper reviews the present state of such knowledge as currently practised in continental-shelf operations, and as proposed in various deep-sea mining operations. Associated research requirements for future mineral exploitation in the deep-sea environment are discussed.

Nonlinear Dynamics of a Spar Platform

2012 ◽  
Author(s):  
Elvidio Gavassoni ◽  
Paulo Batista Gonçalves ◽  
Deane M. Roehl
Keyword(s):  
Asymptotic Methods ◽  
Weather Conditions ◽  
Gas Production ◽  
Spar Platform ◽  
Highly Nonlinear ◽  
Oil And Natural Gas ◽  
The Stability ◽  
Floating Platforms ◽  
And Storage

Spar floating platforms have been largely used for deep water drilling, oil and natural gas production and storage of these fluids. In extreme weather conditions such structures may exhibit a highly nonlinear dynamic behavior. In this paper a 2-DOF model is used to study the heave and pitch coupled response in free and forced vibration. Special attention is given to the determination of the nonlinear vibration modes (NNMs). Non-similar and similar NNMs are obtained analytically by direct application of asymptotic methods and the results show important NNM features such as instability and multiplicity of modes. The NNMs are used to generate reduced order models that consist of 1-DOF nonlinear oscillators. It facilitates the parametric analysis and the derivation of important features of the system such as the frequency-amplitude relation associated to each nonlinear mode and resonance curves. The stability is analyzed by the Floquet theory. Bifurcation diagrams and Mathieu charts are used to identify the unstable regions in the force parameter space. The analytical results show good agreement with the numerical solution obtained by direct integration of the equation of motion.

SALVAGING OIL IN THE SOUTH ATLANTIC1

2001 ◽  
Vol 2001 (2) ◽  
pp. 1333-1336
Author(s):  
Richard Tatner
Keyword(s):  
Oil Pollution ◽  
Local Environment ◽  
Weather Conditions ◽  
Structural Condition ◽  
Fuel Oil ◽  
The South ◽  
South Georgia ◽  
Specialized Equipment ◽  
The Stability ◽  
Oil Tanks

ABSTRACT Oil Spill Response Limited (OSRL) was contracted by the South Georgia and South Sandwich Islands (SGSSI) government to conduct an investigation into the stability and potential oil pollution problem of three ex-whale/seal catcher vessels. The three vessels sunken/semisubmerged at their moorings are located in Grytviken Harbour on the Island of South Georgia located over 900 miles south east of the Falkland Islands. The purpose of the survey was threefold: (1) to corroborate previous surveys and quantify the amount of oil remaining in the three vessels; (2) to recommend a remedial solution whilst simultaneously looking into putting together the logistic to tangibly rectify the problem long term; and (3) finally and most importantly, to complete all of this without upsetting this fragile environment and ecology of the harbor and more over the Island of South Georgia. The ex-whale catch Petrel was the primary interest. A report was required on the vessels structural condition and content of her fuel oil tanks in respect to there being an imminent risk of more oil escaping from a damaged fuel oil tank into the marine environment and having an environmental impact. Recommendations were required on the feasibility of removing the oil and stabilizing the vessel. This brief applied equally to the ex-whale/seal catchers Albatross and Dias. The investigation revealed the quantity of fuel oil contained within the Petrel to be less than expected. In addition, the oil had not deteriorated as might have been expected considering the number of years in the tanks. A sample of fuel oil was taken and sent for analysis on return. The potential risk of a large spill from the damaged tank and the threat to the local environment were found to be negligible. Removal of the fuel oil from the tanks is considered to be fairly straightforward given the correct equipment and weather conditions. The investigation of the Albatross and Dias found these two vessels to be in worse structural condition by comparison with the Petrel. The two vessels were found to be more difficult to examine due to the greater percentage of their structure being below water. Examination of their fuel tanks to determine contents was not possible because of the fuel tank hatches being permanently submerged. Investigation and removal of any oil found within the tanks of the two vessels is possible, but, unlike the Petrel, specialized equipment would be required (Figure I).

scholarly journals Contribution of SAR Radar Imagery in the Study of the Dynamics of the Danube Island System, Giurgiu-Călăraşi Sector, Romania

2020 ◽  
Vol 63 (1-4) ◽  
pp. 1-6
Author(s):  
K. Hachemi ◽  
F. Grecu ◽  
G. Ioana-Toroimac ◽  
Ş. Grigorie (Omrani) ◽  
A. Ozer ◽  
...  
Keyword(s):  
Weather Conditions ◽  
Radar Signal ◽  
High Wind ◽  
Wind Speeds ◽  
Radar Images ◽  
First Results ◽  
Radar Imagery ◽  
Island System ◽  
The Stability ◽  
Very High

SAR radar imagery allows spatial and temporal, regular and precise tracking of surfaces. The response of the radar signal is particularly sensitive to the topography, the roughness and the humidity of the grounds, thus making it possible to detect possible changes occurring between different acquisitions. The surface of the islands is formed especially of alluvial materials and covered by vegetation. The latter contributes greatly to the stability of the islands. The aim of this work is to show the contribution of radar imagery in the study of the dynamics of the Danube island system, Giurgiu-Călăraşi sector, in Romania. This study, based on amplitude images, showed the possibility of determining, locating, inventorying and mapping 11 islands (including 19 sub-islands). The radar images delimit perfectly the latter due to their sensitivity to roughness. Their surface is very rough and wet represented by a strong radiometry. On the other hand, the water surface is smooth thus giving values of low radiometry. The first results obtained show that over this period between 1995 and 2009, the changes are due mainly to weather conditions, precipitation and very high wind speeds. They also reveal an increase in sediment over this 14-year period.

scholarly journals Traditional Ship Stability Evaluation in Toba Lake

2021 ◽  
Author(s):  
Abdy Kurniawan ◽  
Wilmar Jonris Siahaan
Keyword(s):  
Weather Conditions ◽  
Water Area ◽  
Stability Evaluation ◽  
Ship Stability ◽  
Tourist Destination ◽  
Mode Of Transportation ◽  
Local Water ◽  
Bad Weather ◽  
The Stability ◽  
Poor Stability

Toba Lake is a major tourist destination in Indonesia, and traditional boats are a popular mode of transportation for residents and tourists alike. However, these traditional ships have been involved in multiple accidents with significant casualties. This study aims to evaluate the stability of the ship according to the conditions of the local water area. The results showed that traditional boats that have been modified to have double decks (to allow for higher customer capacity) have poor stability, especially in bad weather conditions. To maintain sailing safety, it is recommended to recondition the ship into a single deck, avoiding overloads and bad weather. Keywords: Ship Stability, Toba Lake, Evaluation

AGROBIOLOGICAL FEATURES OF A NEW VARIETY OF SPRING BARLEY

1970 ◽  
pp. 56-58
Author(s):  
O. B. Batakova ◽  
V. А. Korelina ◽  
I. V. Zobnina
Keyword(s):  
Spring Barley ◽  
Economic Effect ◽  
Statistical Processing ◽  
Stability Index ◽  
Weather Conditions ◽  
Climatic Conditions ◽  
Federal State ◽  
New Variety ◽  
Growing Conditions ◽  
The Stability

The selection work has been carried out on the base of the Primorskiy branch of the Federal Center for Integrated Arctic Research of the Russian Academy of Sciences (FCIARctic) in 2005-2016, in a selection seven-field crop rotation. Various weather conditions contributed to a complete and comprehensive assessment of the selected sample. Data on agrometeorological research were provided by the Federal State Budgetary Institution “Northern UGMS” of the Hydrometсenter at the post of Kurtsevo. Assessment of breeding material was carried out by the main breeding valuable traits, taking into account the length of the growing season, resistance to lodging and grain yield according to the methodology of the State Commission for the Testing of Crops (1985).  Statistical processing of the experiment results were carried out using the genetic and selection software package AGROS version 2.07. A new variety of spring fodder barley “Kotlas” with increased adaptability for variable growing conditions was developed, it intended for cultivation in extreme climatic conditions of the Far North as an early ripening, productive, adaptive to unfavorable environmental factors to obtain concentrated feed for livestock and poultry. The variety is immune to net blotch of the Arkhangelsk population. The stability index (L) of the variety is 53. The new variety usage will increase the yield of spring barley, increase the economic efficiency of using the variety to 15%, the economic effect of introducing the variety per unit volume of production is 7.85 thousand rubles.

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