MATHEMATICAL MODEL FOR THE EVOLUTION OF Chlorella Algae

Cârdei, Petru; Nedelcu, Ancuta; Ciupercă, R.

doi:10.35633/inmateh_57_10

Cited by 5 publications

(6 citation statements)

References 9 publications

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“…In China, the direct discharge of untreated livestock manure is prohibited, and the government encourages the utilization of livestock manure as a resource to achieve sustainable development of animal husbandry (Bai et al, 2016). The moisture content of livestock and poultry manure is generally above 80%, and solid-liquid separation (compression dehydration) is the critical common link in the pre-treatment of comprehensive utilization of manure (Cârdei P. et al, 2019;Hjorth et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Construction of Constitutive Model for Compression and Stress Relaxation of Cattle Manure

ZHAO,

CHEN,

LIN

et al. 2023

INMATEH

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In order to study the mechanical properties of compression and stress relaxation of manure under drainage conditions, the experiment was carried out with cattle manure as the object, and the constitutive models were improved to describe the stress-strain curves of compression and stress relaxation. The defined constitutive model was determined by parameter identification, and the influence laws of moisture content and filling mass on the compression and relaxation process were investigated. The results show that the improved Nishihara model and the five-component generalized Maxwell model can better describe the compression and stress relaxation properties of cattle manure, and the coefficients of determination of the parameters of the fitted intrinsic model are all greater than 0.9, with high fitting accuracy. The compression process was divided into three stages: exhaust, drainage, and viscoelastic-plastic deformation. The stress decay rate tended to change quickly and then slowly, and there was a negative correlation between the compressed mass, moisture content, and stress decay rate. Duncan's mean comparisons revealed that the differences in elastic modulus between different moisture content / compressed mass groups in the parameters of the cattle manure compression principal model were all significant (P<0.05). The differences in elastic modulus and coefficient of viscous attenuation between different moisture content groups in the parameters of the stress relaxation model were all significant. The study's results can provide the theoretical basis for the study and simulation of CM's compression and dewatering mechanism and provide support for the solid-liquid separator for livestock and poultry manure.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Construction of Constitutive Model for Compression and Stress Relaxation of Cattle Manure

ZHAO,

CHEN,

LIN

et al. 2023

INMATEH

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“…Over the last 20 years, mathematical modeling has become a common topic in the studies on the accumulation of heavy metals in plants [1,5,9,[45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

“…The models in this paper aim at the further development of the growth models according to the influencing and bioaccumulation factors shown in studies [47][48][49]60]. Compared to the original model [50,61,62], study [49] introduced the influence of temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The main purpose of this model is to simulate the dependence of temperature, bioaccumulation and the reaction of plants to heavy metal ions in the soil, a factor that depends on the concentration of heavy metals. Taking into account the models presented in this paper, and following the same working method as that in study [47], different mathematical models can be developed, which contain the most important or all the factors involved in the growth, vegetative evolution, aging and death of plants [49]. In this paper, we developed the exposition of the model from [49] and the presented results imply a better understanding of the model and the construction method.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Model to Simulate the Transfer of Heavy Metals from Soil to Plant

et al. 2021

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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.

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“…The main task of soil cultivation [3] is to improve the water-air regime in soils, regulate their balance, ensure the accumulation of nutrients, as well as improve the physical, chemical and biological properties [4]. Soil cultivation equipment can be improved according to the parameters that characterize the geometry machines and working bodies; by modes characterizing the dynamics and energetic of the process; in terms of indicators characterizing the quality of work, depending on the physical and mechanical properties of the soil [5]. Over consolidation of the soil by agricultural machines during its cultivation has a negative effect on the growth of the root and aerial parts of plants [6], as a result of which the yield of cultivated crops decreases [7].…”

Section: Introductionmentioning

confidence: 99%

Family of universal high-speed cultivators UKS

et al. 2021

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At present, when cultivating various agricultural crops, there is an increased load of machine-tractor units on the soil horizon, due to the use of multi-operational tillage technology. The family of universal high-speed cultivators UKS of 10-, 12- and 14-meters working width simultaneously performs the following technological operations: loosening without turning the layer with cutting and combing out weeds, as well as compacting and mulching the soil surface. UKS cultivators include the following structural elements: a frame with a hitch, a hydraulic system, a disc bar, a frame consisting of the middle and side sections and wings on the transverse bars of which there are five rows of duckfoot paws, support-running wheels, and a scraper frame with seals. In the course of field research of the developed universal high-speed cultivators, it was established that their quality indicators correspond to the agrotechnical requirements: the deviation of the processing depth from the average does not exceed 1.5 cm; the presence of ridges on the surface of the field less than 3 cm high; the number of fractions less than 25 mm in size (crumbling) was more than 80%; crop and plant residues remained on the surface of the field by at least 80%.

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MATHEMATICAL MODEL FOR THE EVOLUTION OF Chlorella Algae

Cited by 5 publications

References 9 publications

Mechanical Properties and Construction of Constitutive Model for Compression and Stress Relaxation of Cattle Manure

Mechanical Properties and Construction of Constitutive Model for Compression and Stress Relaxation of Cattle Manure

Mathematical Model to Simulate the Transfer of Heavy Metals from Soil to Plant

Family of universal high-speed cultivators UKS

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