scholarly journals Chlorophyll concentration in marine microalgae biomass under the condition of light limitation (model)

2019 ◽  
Vol 4 (4) ◽  
pp. 100-102 ◽  
Author(s):  
R. P. Trenkenshu ◽  
T. M. Novikova
Keyword(s):  
Mathematical Model ◽  
Chlorophyll Concentration ◽  
Marine Microalgae ◽  
Experimental Results ◽  
Light Limitation ◽  
Microalgae Biomass ◽  
Tetraselmis Viridis

The paper presents a mathematical model of light-dependent chlorophyll concentration in the marine microalgae biomass. The model is based on the concept of biomass as the sum of reserve and structural macromolecular forms of organic cell matter. At the same time, chlorophyll refers to structural forms of biomass. Using such concepts, it is possible to apply known equations for light-dependent content of structural forms in biomass. The proposed equation describes well the experimental results obtained in a number of experiments with the chlorophyllostate culture Tetraselmis viridis.

Modified equation of chlorophyll content in microalgal biomass under light limitation

2020 ◽  
pp. 17-24
Author(s):  
Alexander S. Lelekov ◽  
Rudolf P. Trenkenshu ◽  
Tatyana M. Novikova
Keyword(s):  
Chlorophyll Concentration ◽  
Arthrospira Platensis ◽  
Light Limitation ◽  
Specific Rate ◽  
Microalgal Biomass ◽  
Basic Model ◽  
Microalgae Biomass ◽  
Rate Of Photosynthesis ◽  
Species Specific ◽  
Irradiation Parameter

The paper presents a modified mathematical model of light-dependent chlorophyll concentration in the microalgae biomass. The basic model is based on the concept of biomass as a sum of reserve and structural components. Considering that part of the structural biomass can turn into a reserve, the minimum irradiation parameter (“photosynthesis compensation point”) is added to the basic equation. Verification of the model on experimental data for turbidostat cultures of Tetraselmis viridis and Arthrospira platensis allowed us to evaluate species-specific coefficients. The obtained coefficient values are similar for both species. The share of chlorophyll in structural biomass is about 2 %, the maximum share of structural forms of biomass is 84 %, the economic conversion factor of reserve biomass to structural is 80–90 %, and the maximum specific rate of photosynthesis is 14–20 times higher than the rate of endogenous consumption of biomass.

Influence of Reservoir Transit on Riverine Algal Transport and Abundance

1984 ◽  
Vol 41 (12) ◽  
pp. 1803-1813 ◽  
Author(s):  
D. M. Søballe ◽  
R. W. Bachmann
Keyword(s):  
Water Temperature ◽  
Retention Time ◽  
Standing Crop ◽  
Algal Biomass ◽  
Chlorophyll Concentration ◽  
Light Limitation ◽  
Des Moines ◽  
Flow Dependence ◽  
Major Loss ◽  
Chlorophyll Concentrations

The Des Moines River lost 65–75% of its algal standing crop (chlorophyll a) in passing through each of two impoundments (mean retention times 11 and 16 d), and chlorophyll concentrations within both impoundments were 50–90% below the predictions of empirical chlorophyll–nutrient models. Sedimentation of river-borne algae and light limitation within the impoundments were identified as major loss processes. A reduction in algal size from upstream to downstream in one reservoir paralleled the loss of algal biomass. Algal losses in each impoundment increased with both increasing retention time and water temperature so that chlorophyll concentration below the dams was uncoupled from the temperature and flow dependence seen in river reaches not influenced by impoundments. The reduction in riverine algal transport associated with reservoir transit was cumulative over the two-reservoir series; this reduction can be interpreted as a "reset" to river headwater conditions.

Friction and Tribological Considerations for Nanometer Range Machining

2001 ◽  
Author(s):  
Som Chattopadhyay
Keyword(s):  
Mathematical Model ◽  
High Precision ◽  
Local Deformation ◽  
Experimental Results ◽  
Precision Machining ◽  
Complex Motion ◽  
Positioning Accuracy ◽  
Nanometer Range ◽  
Motion Characteristic ◽  
Low Speeds

Abstract Positioning accuracy within the range of nanometers is required for high precision machining applications. The implementation of such a range is difficult through the slides because of (a) irregular nature of friction at the slider-guideway interface, and (b) complex motion characteristic at very low speeds. The complexity arises due to the local deformation at the interface prior to breakaway, which is known as microdynamics. In this work prior experimental results exhibiting microdynamics have been appraised, and mathematical model developed to understand this behavior.

Design and Experimental Analysis of Novel Refractometer Based on Photoelectric Sensor Technology

2011 ◽  
Vol 383-390 ◽  
pp. 5211-5215
Author(s):  
Yin Lin Li ◽  
Zhong Hua Huang ◽  
Kai Bo Hu
Keyword(s):  
Mathematical Model ◽  
Experimental Analysis ◽  
Differential Method ◽  
Theoretical Solution ◽  
Experimental Results ◽  
Sensor Technology ◽  
Photoelectric Sensor ◽  
Better Than

A novel refractometer based on photoelectric sensor technology and differential method is proposed. Sensing principle and mathematical model are introduced; structure and key parameters of sensing probe are designed through detail calculation. Theoretical solution shows resolution reaches order of 10-5. Preliminary experiments verify the feasibility of the design, experimental results show stability error better than ±1.02×10-4, error caused by temperature is 6.65×10-6/°C.

An Improved Trace Method for Moving Target under Occlusion

2014 ◽  
Vol 672-674 ◽  
pp. 1931-1934
Author(s):  
Yu Bing Dong ◽  
Guang Liang Cheng ◽  
Ming Jing Li
Keyword(s):  
Mathematical Model ◽  
Target Tracking ◽  
Difficult Problem ◽  
Block Matching ◽  
Experimental Results ◽  
Polar Coordinates ◽  
Moving Target ◽  
Trajectory Prediction ◽  
Tracking Method

Occlusion is a difficult problem to be solved in the process of target tracking. In order to solve the problem of occlusion, a new tracking method combined with trajectory prediction and multi-block matching is presented and studied,and a mathematical model of trajectory prediction of moving target is established in polar coordinates and verified through some experiments. The experimental results show that the new tracking method can be better to trace and forecast the moving target under occlusion.

scholarly journals Modelling simultaneous removal of trichlorfon and glucose in a hybrid bioreactor containing magnetically immobilized biomass

1998 ◽  
Vol 38 (4-5) ◽  
pp. 179-186 ◽  
Author(s):  
Guang Hao Chen ◽  
Hiroaki Ozaki ◽  
Yutaka Terashima
Keyword(s):  
Mathematical Model ◽  
Carbon Source ◽  
Experimental Results ◽  
Simultaneous Removal ◽  
Industrial Wastewaters ◽  
Suspended Biomass ◽  
Immobilized Biomass

This paper focuses on a simultaneous removal of trichlorfon and glucose that was added as carbon source for degradation requirement of trichlorfon. A hybrid bioreactor, having both suspended and magnetically immobilized biomass, was used for investigating this removal of both substances. To evaluate the respective roles of these two types of biomass, a mathematical model was developed and also verified well with experimental results. It has been found that the suspended biomass plays a key role in removing both substances in the system. This is due to complete coexistence of both trichlorfon-degrading and glucose-removing bacteria completely in each type of the biomass. Such a system would be applicable to the treatment of complex industrial wastewaters that contain easily biodegradable organics as well as refractory pollutants.

scholarly journals Trajectory planning method of mobile piezorobot

2009 ◽  
Vol 50 ◽  
Author(s):  
Ramutis Bansevičius ◽  
Asta Drukteinienė ◽  
Genadijus Kulvietis
Keyword(s):  
Mathematical Model ◽  
Mobile Robots ◽  
Trajectory Planning ◽  
Simultaneous Equations ◽  
Planning Method ◽  
Experimental Results

This paper presents analysis of trajectory planningmethods for mobile robots and new trajectory planning method research for mobile piezorobots. Here are deduced motional simultaneous equations for this kind of robots that describe point-to-pointmotion by given function. Preliminary experimental results prove the feasibility of proposed mathematical model.

Feeding Mathematical Modeling of Superalloy Vacuum-Electromagnetic Casting and its Application

2012 ◽  
Vol 629 ◽  
pp. 171-175
Author(s):  
Wen Zhong Jin ◽  
Su Fang Li ◽  
Wei Zhang
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
New Technology ◽  
Experimental Results ◽  
Electromagnetic Stirring ◽  
Shrinkage Cavity ◽  
Vacuum Casting ◽  
Electromagnetic Casting ◽  
Wide Range

The new technology of superalloy vacuum-electromagnetic casting was developed and the feeding mathematical model melt in vacuum-electromagnetic casting was established. The availability of mathematical model was approved by the experiments of the IN100 superalloy. The experimental results indicate that the feeding capacity of melt in vacuum casting can be greatly increased by imposing the 50Hz, 60A rotating electromagnetic stirring, which can decrease the central shrinkage cavity in superalloy ingots, so the quality of the superalloy ingots can be wide-range improved.

Sign in / Sign up

Export Citation Format

Share Document