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Use of industrial equipment at high performance and productivity parameters leads to ensuring their productivity and the precision generating the quality of the products manufactured. In this sense, an important role at the organizational level is represented by the activity of maintenance, as a support process that ensures the smooth running of the manufacturing process, respectively manufacturing products. The article presents some aspects regarding the structured approach to the maintenance of production equipment with an emphasis on proactive maintenance and its advantages. [ABSTRACT FROM AUTHOR]

Copyright of INMATEH - Agricultural Engineering is the property of INMATEH - Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of INMATEH - Agricultural Engineering is the property of INMATEH - Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article continues the exposition of the results obtained in researching an agricultural machine for processing soil, designed for research with applications including exploitation. The MCLS (complex machine for soil tillage) was designed to research the working processes of the instruments intended for soil processing. The MCLS cultivator is a modulated machine (it can work for three working widths: 1, 2, and 4 m, with tractors of different powers) that is designed to use a wide range of working bodies. The experimental data obtained with the structure with a working width of 1 m and the results of their processing within the framework of the theory of random vibrations are presented in this article. The experimental results are analysed as random vibrations of the supports of the active working bodies. As a result, the main characteristics of random vibrations are exposed: the distribution function, the average value, the autocorrelation, and the frequency spectrum. These general results regarding random vibrations are used for several critical applications in the design, execution, and exploitation of some subassemblies and assemblies of agricultural machines of this type. The main applications include estimating the probability of the occurrence of dangerous load peaks, counting and selecting the load peaks that produce fatigue accumulation in the material of the supports of the working bodies, identifying some design deficiencies or defects in the work regime, and estimating the effects of vibrations on the quality of soil processing. All of the outcomes are composed of applications in MCLS research and exploitation. The applications pursue well-known objectives of modelling the working processes of agricultural machines: safety at work, increasing the quality of work, optimising energy consumption, and increasing productivity, all in a broad context to obtain a compromise situation. The material and the method are based on experimental data acquisition, processing, and interpretation. [ABSTRACT FROM AUTHOR]

The article presents an energy system solution in which the heat energy required to get domestic hot water needed for a family home is obtained by the cumulative conversion of energy from 2 renewable sources: solar energy and biomass energy. Compared to the classic variants of thermal systems, which exploit a single source and provide only partially the energy needed, the combined use consists of energy supply from one source when the other is unavailable or insufficient. In the present case, when the domestic hot water requirement is no longer covered by the solar thermal panels (consumption during the night, days without sun or temporary consumption higher than the usual one), energy from biomass is used in the same system. It is converted to thermal energy using a generator where the gasification module uses the TLUD process. In addition to a higher yield of biomass, this process allows the use of a wide range of biomass types, existing in rural areas. The article presents the results obtained from the experimentation of the system that uses 4 solar panels and a thermal energy generator with a power of approx. 10 kW.

Soil is one of the natural reservoirs of the carbon biogeochemical cycle, incorporating approximately 6000 billion tons of carbon. Given that with the industrial development more and more carbon is emitted into the atmosphere, solutions, technologies and methods are being sought to reduce this carbon or, where appropriate, it is not eliminated into the atmosphere. The purpose of this paper is to study and identify the simplest methods to be applied in agriculture, for soil processing, by identifying the techniques, technologies and equipment to achieve this without turning the furrow, so that the carbon incorporated in the soil by plants remains sequestered there.

Hemp (Cannabis sativa L) is a plant whose use is expanding in countless industries. Given that there are many facilities to purchase hemp now, it is important for growers to produce the best quality product for processing. In this article, different conditioning solutions (cleaning, sorting and storage) and technical equipment are analysed in order to obtain high quality seed material or raw materials for industrial hemp processing. The quality of a crop, as well as of the products obtained after processing, crucially depends on maintaining a favourable climate during the storage period, maintaining the physical and chemical properties of the seeds resulting from the harvest. Noncompliance with the rules cancel the good practices applied by farmers during each stage prior to this time. Seed damage is associated with genotype, history and physical and chemical compositions. Hemp seed can be dried to a low moisture content and stored at low temperature for several years. In order to process, store and capitalize the seeds for sowing, immediately after harvest, must be maintained the properties of biological value, of improvement and maintenance of those of cultural value, of carrying out appropriate treatments against diseases and pests, of packaging and labelling the seeds according to destination and the provisions of the regulations in force, to periodically analyse the seeds in accredited laboratories and to deliver or use them only on the basis of quality certificates or analysis bulletins. [ABSTRACT FROM AUTHOR]

The aim of the study was to identify new mathematical models and strategies that can characterize the behavior of pollutants accumulating in the soil over time, considering the special characteristics of these chemicals that cannot be degraded or destroyed easily. The paper proposes a statistical model for assessing the accumulation of Zn in the lettuce (Lactuca sativa L.), based on three indicators that characterize the development of lettuce plants over time. The experimental data can be used to obtain interpolated variations of the mass increase functions and to determine several functions that express the time dependence of heavy metal accumulation in the plant. The resulting interpolation functions have multiple applications, being useful in generating predictions for plant growth parameters when they are grown in contaminated environments, determining whether pollutant concentrations may be hazardous for human health, and may be used to verify and validate dynamic mathematical contamination models. [ABSTRACT FROM AUTHOR]

The paper presents a mobile system for the production of electricity from alternative sources (solar + wind) which is intended for use in any isolated place, where there is no possibility to connect to an electricity grid, to ensure the electricity needed by various consumers in agricultural applications and agricultural crop monitoring, remote transmission and management services. At the same time, this mobile system, which is an ecological and economical electricity generator, can be used in the following locations without electricity: holiday homes, cottages, sheep farms, farms, greenhouses, caravans, bee trailers, boarding houses, monasteries, etc. The results of the research allow useful recommendations for farmers who want to use alternative energy sources in isolated farms, to reduce dependence on volatile and uncertain fossil fuel markets, especially oil and gas ones. [ABSTRACT FROM AUTHOR]

The paper presents one of the important objectives approached by the IND-AGRO-POL Cluster Association on providing technical advice to the fruit- growing farmers by addressing innovative methods for specific applications against fruit trees late spring frosts. The paper presents briefly and easily understandable the current state of knowledge regarding the protection against frosts of fruit tree plantations, offering practical advice for optimal planning according to the working conditions of the Romanian fruit tree farms that lead to reducing the consequences and combating the frosts by reducing the radiative cooling, destructing the thermal inversion layer from the soil, homogenizing the air temperature in the microclimatic layer and consequently, maintaining the air temperature on the soil surface above 0°C. [ABSTRACT FROM AUTHOR]

Heavy metals are naturally occurring elements, but their various applications have led to their wide circulation in the environment, raising concerns over their latent effects on the environment and human health. Their toxicity depends on numerous factors, including chemical species, concentration of heavy metal ions, environmental factors, etc. Experimental studies on the single or cumulative effects of heavy metals on plants are complex, time consuming and difficult to conduct. An alternative is mathematical modeling, which can include different factors into an integrated system and can predict plant and environmental behavior under multiple stressors. This paper presents a mathematical model that simulates the dependence of temperature, concentration of Zn in the soil and the subsequent bioaccumulation in lettuce (Lactuca sativa L.); respectively, the reaction of lettuce to Zn contamination. The main results consist of three mathematical models, based on systems of ordinary differential equations and checking their predictions with available experimental data. The models are applied to predict an optimal harvest time of lettuce with low concentration of Zn, in identifying the availability of the analyzed species to phytoremediation operations and the possibility of maneuvering certain control factors to reduce or increase the intensity of the bioaccumulation process. [ABSTRACT FROM AUTHOR]