84 research outputs found
Comparative analysis of forest lands cadastral appraisal estimated with regards to wood and food resources
Cadastral appraisal of forest fund is one of the topical challenges of modern natural resource management. The paper delivers comparison of different approaches to cadastral appraisal of forest lands. The authors suggest a uniformed model to compare objectively and choose the most effective use of parcels
Additive model of Larix sp. forest stand biomass sensitive to temperature and precipitation variables in Eurasia
The first attempt of modeling changes in additive component composition of biomass of Larix sp. communities on the Trans-Eurasian hydrothermal gradients based on regional peculiarities of age and morphology of the forests is attempted. The increase of all biomass components of the tree layer with increasing temperature at the constant precipitation and its decrease with increasing precipitation at the constant temperature is established. The positive relationship of the understory biomass with the temperature in the areas of insufficient moisture as the transition to moisture-rich areas is replaced by the opposite one. The development of such models for basic forest-forming species in Eurasia will give possibility to predict any changes in the biological productivity of forest cover of Eurasia in relation to climate change. © 2019 IOP Publishing Ltd. All rights reserved
Comparative analysis of forest lands cadastral appraisal estimated with regards to wood and food resources
Cadastral appraisal of forest fund is one of the topical challenges of modern natural resource management. The paper delivers comparison of different approaches to cadastral appraisal of forest lands. The authors suggest a uniformed model to compare objectively and choose the most effective use of parcels
Дослідження функціонування теплообмінника у ґрунтах різної температуропровідності
It was found with the help of mathematical model of the process of heat exchange between the air moving in vertical heat exchanger and the massif of soil, which connects energetic factors of the soil heat exchanger with its parameters as well as natural-climatic conditions that effective thermal energy during the term of heat exchanger functioning depends linearly on thermal diffusivity of soil both for separate heat exchanger and for two heat exchangers located at 4m between axes. Calculative experiment was conducted with application of the packet of calculative hydrodynamics ANSYS Fluent. Temperature field of the air being cooled and of the massif of soil has been detected for the soils with different thermal diffusivity. It has been found that temperature diffusivity of the soil is a determinative factor of energy potential of soil and has a dramatic effect on the effective thermal capacity especially for long-term functioning of soil heat exchanger. From the soil with temperature diffusivity 2,68 m2/s we can obtain approximately 3,6 times as more effective thermal energy while heat exchanger is functioning than from the soil with temperature diffusivity 0,83 m2/s.С помощью математической модели процесса теплообмена между воздухом, движущимся в вертикальном теплообменнике, и массивом грунта, которая связывает между собой энергетические показатели грунтового теплообменника с его параметрами, а также природно-климатическими условиями, установлено, что эффективная тепловая энергия за время функционирования теплообменника линейно зависит от температуропроводности грунта как для отдельно расположенного теплообменника, так и для двух теплообменников, расположенных на межосевом расстоянии 4 м. Вычислительный эксперимент проводился с использованием пакета вычислительной гидродинамики ANSYS Fluent. Определено температурное поле охлаждаемого воздуха и массива грунта для грунтов различной температуропроводности. Установлено, что температуропроводность грунта является определяющим показателем его энергетического потенциала и очень сильно влияет на эффективную тепловую мощность, особенно при длительном времени функционирования грунтового теплообменника. От грунта с температуропроводностью 1,03∙10-6 м2/с можно получить примерно в 3,6 раза больше эффективной тепловой энергии за время функционирования теплообменника, чем от грунта с температуропроводностью 0,32∙10-6 м2/с.За допомогою математичної моделі процесу теплообміну між повітрям, що рухається в вертикальному теплообміннику, і масивом грунту, яка пов'язує між собою енергетичні показники грунтового теплообмінника з його параметрами, а також природно-кліматичними умовами, встановлено, що ефективна теплова енергія за час функціонування теплообмінника лінійно залежить від температуропроводности грунту як для окремо розташованого теплообмінника, так і для двох теплообмінників, розташованих на міжосьовій відстані 4 м. Ви іслітельний експеримент проводився з використанням пакету обчислювальної гідродинаміки ANSYS Fluent. Визначено температурне поле охолоджуваного повітря і масиву грунту для грунтів різної температуропроводности. Встановлено, що температуропровідність грунту є визначальним показником його енергетичного потенціалу і дуже сильно впливає на ефективну теплову потужність, особливо при тривалому часу функціонування грунтового теплообмінника. Від грунту з температуропроводностью 1,03 ∙ 10-6 м2 / с можна отримати приблизно в 3,6 рази більше ефективної теплової енергії за час функціонування теплообмінника, ніж від грунту з температуропроводностью 0,32 ∙ 10-6 м2 / с
Comprehensive Processing of Fine Metallurgical Dust
The processing of fine metallurgical dust by pyrometallurgical methods leads to the accumulation of impurities and deterioration in the quality of blister copper. Fine dust contains copper, zinc, lead, arsenic and iron. A hydrometallurgical method for the separation of the main components into the following products is proposed: copper-zinc residue, iron-arsenic residue, lead residue. The hydrometallurgical scheme consists of three stages of leaching: neutral and using sulfuric and nitric acids. When processing metallurgical dust according to the proposed scheme, a solution containing copper, zinc, iron and arsenic is formed, as well as a lead containing precipitate. Arsenic and iron are removed from the solution in the form of iron (III) arsenate, after which zinc and copper are precipitated. Lead in sediment is in carbonated form. The developed technology allows the extraction of: 87% copper, 88% zinc, 83% iron, 83% arsenic, 99% lead in individual products.
Keywords: metallurgical dust, arsenic removal, nitric acid leachin
The issues of weed infestation with environmentally hazardous plants and methods of their control
The authors analyze expansion of segetal and ruderal vegetation on agricultural lands in Leningrad and Tomsk oblasts, typical for the European and Asian parts of Russia. The spreading conditions, composition of species, biological features and ecological requirements of the most aggressive species are identified. Some effective ways of weed control are suggested
Роль молекул межклеточной адгезии в развитии неопластических изменений эндометрия
In article the processes of intercellular adhesion in unchanged proliferating endometrium, hyperplasia and adenocarcinoma are surveyed. Expression E-kadherin, β-katenin and claudin-1 at different stages of epithelial neoplastic transformation of endometrium by immunohistochemical method had been estimated. The role of key proteins Wnt-signaling pathway and Claudine-1 in the development of malignant transformation of glandular cells of endometrium was established.В статье рассматриваются процессы межклеточной адгезии в неизмененном пролиферирующем эндометрии при гиперпластических процессах и аденокарциноме. С помощью иммуногистохимического метода была оценена экспрессия E-кадгерина, β-катенина и клаудина-1 на разных стадиях неопластической трансформации эпителия эндометрия. Установлена роль ключевых белков Wnt-сигнального пути и клаудина-1 в развитии злокачественной трансформации железистых клеток эндометрия
Alkene and Olefin Functionalization by Organoaluminum Compounds, Catalyzed with Zirconocenes: Mechanisms and Prospects
Alkene and olefin functionalization via addition of electro‐ or nucleophilic reagents is one of the convenient synthetic methods for the insertion of heteroatoms into organic molecules. The use of organometallic reagents in these reactions in combination with the specific catalysts provides high substrate conversion and process selectivity. The introduction of this approach into the chemistry of organoaluminum compounds leads to the development of chemo‐, regio‐ and stereoselective catalytic methods of alkene and olefin functionalization. The chapter focuses on the modern concepts of the alkene hydro‐, carbo‐ and cycloalumination mechanisms, that is, the experimental and theoretical data on the intermediate structures involved in the product formation, the effects of the catalyst and organoaluminum compound structure, reaction conditions on the activity and selectivity of the bimetallic systems. The prospects of the development of enantioselective methods using these catalytic systems for the alkene and olefin transformations are considered
The problem of cadastral appraisal of forest lands taking into account the infrastructure of the forestry fund
Forest lands are the main means of production in the forest sector. For the most territories in the Russian Federation there are established methods of cadastral appraisal, but not for the forest regions taking up 2/3 of the country’s area. In 2002 Russian Government made an attempt to solve this problem and recommended a method of cadastral appraisal for the lands of the forestry fund. However, the method did not find practical application and was dismissed in 2010, and no substitution followed. In each subject of the Russian Federation private appraisers offer their own options of forest land valuation, but their results differ significantly even for the lands with comparable species of wood, productivity, site quality and age composition of the stand. Moreover, valuation organizations do not take into account forest infrastructure.
Authors propose a universal method suitable for the entire territory of the country, which will allow to calculate specific cadastral value of the forest lands taking into account taxation indices of the wood stands growing there. The method is suitable not only for the objective cadastral valuation of the forest lands – reasonable rental payments will provide an opportunity to develop transport infrastructure in the forestry fund, especially forest roads and bridges, and to make timely arrangements for plant maintenance, forest protection and reproduction, which will have a significant influence on social and economic development of forest regions in Russia
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