Light Energy Utilization Efficiency for Photosynthesis

1982 ◽  
Vol 25 (6) ◽  
pp. 1737-1746 ◽  
Author(s):  
J. C. Sager ◽  
J. L. Edwards ◽  
W. H. Klein
Keyword(s):  
Light Energy ◽  
Energy Utilization ◽  
Utilization Efficiency

scholarly journals Research and Design of Wind and Solar Complementary Electric Sightseeing Boat

2020 ◽  
Vol 145 ◽  
pp. 02056
Author(s):  
Haomin Zhang ◽  
Xingang Xu
Keyword(s):  
Power Generation ◽  
Fossil Fuels ◽  
High Efficiency ◽  
Rapid Development ◽  
Light Energy ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Lake Area ◽  
Domestic Water ◽  
Hull Design

To solve the problem of rapid development of domestic water tourism and water pollution in scenic waters, windsurfing technology and solar photovoltaic technology are applied to small and medium-sized sightseeing cruise ships. While optimizing the hull design and component coordination, the application of automatic control technology further improves the utilization efficiency of wind and light energy, and achieves the adaptation of the sail angle of attack and the efficient coupling of the two energies. The ship mainly uses the natural resources of solar energy and wind energy. It will not burn fossil fuels during the ship’s travel, thus reducing the emission of toxic and harmful substances, which has positive significance for environmental protection. In short, the solar wind-assisted power generation ship studied in this project has remarkable features such as zero emission, high degree of intelligence, significant wind-assisted effect, high efficiency of light energy utilization, and low hull space occupation. Compared with the ordinary lake area cruise ship, the energy-saving and emission reduction effect of the power generation ship is very obvious[1].

Design and experiment of a soft-edge aperture with high light energy utilization efficiency and uniformity

2020 ◽  
Vol 59 (18) ◽  
pp. 5348
Author(s):  
Liwei Liu ◽  
Lifang Shi ◽  
Axiu Cao ◽  
Hui Pang ◽  
Wei Yan ◽  
...  
Keyword(s):  
High Light ◽  
Light Energy ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Soft Edge

scholarly journals Phosphate fertilizers increase CO2 assimilation and yield of soybean plants in a shaded environment

2020 ◽  
Author(s):  
Wei Zhao ◽  
Bin Zheng ◽  
Ting-Hu Ren ◽  
Xing-Hui Zhang ◽  
Tang-Yuan Ning ◽  
...  
Keyword(s):  
Photosynthetic Rate ◽  
Phosphate Fertilizer ◽  
Fertilizer Application ◽  
Light Energy ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Maximum Efficiency ◽  
Dry Matter Accumulation ◽  
Low Light ◽  
Phosphorus Application

Abstract To study how phosphate fertilizer regulates the photosynthetic of summer soybeans in low light environment, this study used Qihuang 34 as the test variety, two light treatments[ambient sunlight (L1) during the whole growth period and 40% shade (L2) from 40 days after sowing to 24 days after flowering] with two phosphate fertilizer treatments including non-phosphate fertilizer application (P0), conventional phosphate fertilizer application (P1) in each light treatment was set up to measure the gas exchange, chlorophyll a fluorescence differences of photosynthetic performance as well as the yield and its components in Qihuang 34. The results showed that phosphorus significantly increased chlorophyll content, photosynthetic rate, and grain yield in shading treatment. The yield of soybean was significantly reduced after shading treatment, which was 29.9%, but compared with L2P0, L2P1 treatment yield increased by 36.7%, which was significantly higher than the 27.1% under L1 treatment. The photosynthetic rate under saturated light (Asat) under L2 treatment decreased by 31.5% and 15.6% in R1 and R3 periods, respectively, and average increased by 27.4% and 45% after phosphorus application under two light condition. Furthermore, photosynthetic measurements demonstrated a more significant increase in the maximum efficiency of CO2 fixation, maximum rates of RUBP-carboxylation (Vcmax) in phosphorous treatment under shading conditions. Moreover, further analysis of OJIP curves revealed that phosphate fertilizer significantly improved the electron transfer and light energy absorption performance of the PSII reaction center in shading. The above results demonstrate that phosphate fertilizer contributes to light energy utilization efficiency, increase the low light utilization efficiency by improving PSII performance, promote RUBP regeneration, ensure the source of carboxylates substrates, and coordinate the balance of the photochemical reaction and the Calvin cycle, then alleviate the reduction of photosynthetic efficiency under shading, increase the rate of dry matter accumulation, and greatly increase yield.

scholarly journals Physiological and Molecular Analysis Reveals the Differences of Photosynthesis between Colored and Green Leaf Poplars

2021 ◽  
Vol 22 (16) ◽  
pp. 8982
Author(s):  
Tao Wang ◽  
Lingyu Li ◽  
Guanghao Cheng ◽  
Xiaochun Shu ◽  
Ning Wang ◽  
...  
Keyword(s):  
Photosynthetic Efficiency ◽  
Populus Deltoides ◽  
Assimilation Efficiency ◽  
Co2 Concentration ◽  
Light Energy ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Green Leaf ◽  
Light Quantum ◽  
Anthocyanin Content

Leaf coloration changes evoke different photosynthetic responses among different poplar cultivars. The aim of this study is to investigate the photosynthetic difference between a red leaf cultivar (ZHP) and a green leaf (L2025) cultivar of Populus deltoides. In this study, ‘ZHP’ exhibited wide ranges and huge potential for absorption and utilization of light energy and CO2 concentration which were similar to those in ‘L2025’ and even showed a stronger absorption for weak light. However, with the increasing light intensity and CO2 concentration, the photosynthetic capacity in both ‘L2025’ and ‘ZHP’ was gradually restricted, and the net photosynthetic rate (Pn) in ‘ZHP’ was significantly lower than that in ‘L2025’ under high light or high CO2 conditions, which was mainly attributed to stomatal regulation and different photosynthetic efficiency (including the light energy utilization efficiency and photosynthetic CO2 assimilation efficiency) in these two poplars. Moreover, the higher anthocyanin content in ‘ZHP’ than that in ‘L2025’ was considered to be closely related to the decreased photosynthetic efficiency in ‘ZHP’. According to the results from the JIP-test, the capture efficiency of the reaction center for light energy in ‘L2025’ was significantly higher than that in ‘ZHP’. Interestingly, the higher levels of light quantum caused relatively higher accumulation of QA- in ‘L2025’, which blocked the electron transport and weakened the photosystem II (PSII) performance as compared with ‘ZHP’; however, the decreased capture of light quantum also could not promote the utilization of light energy, which was the key to the low photosynthetic efficiency in ‘ZHP’. The differential expressions of a series of photosynthesis-related genes further promoted these specific photosynthetic processes between ‘L2025’ and ‘ZHP’.

Regional integrated energy system schemes selection based on risk expectation and Mahalanobis-Taguchi system

2021 ◽  
pp. 1-18
Author(s):  
Jiahang Yuan ◽  
Yun Li ◽  
Xinggang Luo ◽  
Lingfei Li ◽  
Zhongliang Zhang ◽  
...  
Keyword(s):  
Energy Demand ◽  
Choquet Integral ◽  
Subjective Evaluation ◽  
Risk Attitude ◽  
Energy System ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Energy Structure ◽  
Fuzzy Measures ◽  
Integrated Energy System

Regional integrated energy system (RIES) provides a platform for coupling utilization of multi-energy and makes various energy demand from client possible. The suitable RIES composition scheme will upgrade energy structure and improve integrated energy utilization efficiency. Based on a RIES construction project in Jiangsu province, this paper proposes a new multi criteria decision-making (MCDM) method for the selection of RIES schemes. Because that subjective evaluation on RIES schemes benefit under criteria has uncertainty and hesitancy, intuitionistic trapezoidal fuzzy number (ITFN) which has the better capability to model ill-known quantities is presented. In consideration of risk attitude and interdependency of criteria, a new decision model with risk coefficients, Mahalanobis-Taguchi system and Choquet integral is proposed. Firstly, the decision matrices given by experts are normalized, and then are transformed to minimum expectation matrices according to different risk coefficients. Secondly, the weights of criteria from different experts are calculated by Mahalanobis-Taguchi system. Mobius transformation coefficients based on interaction degree are to calculate 2-order additive fuzzy measures, and then the comprehensive weights of criteria are obtained by fuzzy measures and Choquet integral. Thirdly, based on group decision consensus requirement, the weights of experts are obtained by the maximum entropy and grey correlation. Fourthly, the minimum expectation matrices are aggregated by the intuitionistic trapezoidal fuzzy Bonferroni mean operator. Thus, the ranking result according to the comparison rules using the minimum expectation and the maximum expectation is obtained. Finally, an illustrative example is taken in the present study to make the proposed method comprehensible.

Evaluation of Energy Efficiency for a CCHP System With Available Microturbine

2007 ◽  
Author(s):  
H. X. Liang ◽  
Q. W. Wang
Keyword(s):  
Gas Turbine ◽  
Waste Heat ◽  
Energy System ◽  
Primary Energy ◽  
Economic Benefits ◽  
Optimal Operation ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Energetic Efficiency ◽  
Efficiency Evaluation

This paper deals with the problem of energy utilization efficiency evaluation of a microturbine system for Combined Cooling, Heating and Power production (CCHP). The CCHP system integrates power generation, cooling and heating, which is a type of total energy system on the basis of energy cascade utilization principle, and has a large potential of energy saving and economical efficiency. A typical CCHP system has several options to fulfill energy requirements of its application, the electrical energy can be produced by a gas turbine, the heat can be generated by the waste heat of a gas turbine, and the cooling load can be satisfied by an absorption chiller driven by the waste heat of a gas turbine. The energy problem of the CCHP system is so large and complex that the existing engineering cannot provide satisfactory solutions. The decisive values for energetic efficiency evaluation of such systems are the primary energy generation cost. In this paper, in order to reveal internal essence of CCHP, we have analyzed typical CCHP systems and compared them with individual systems. The optimal operation of this system is dependent upon load conditions to be satisfied. The results indicate that CCHP brings 38.7 percent decrease in energy consumption comparing with the individual systems. A CCHP system saves fuel resources and has the assurance of economic benefits. Moreover, two basic CCHP models are presented for determining the optimum energy combination for the CCHP system with 100kW microturbine, and the more practical performances of various units are introduced, then Primary Energy Ratio (PER) and exergy efficiency (α) of various types and sizes systems are analyzed. Through exergy comparison performed for two kinds of CCHP systems, we have identified the essential principle for high performance of the CCHP system, and consequently pointed out the promising features for further development.

Nanowire-based zinc-doped tin oxide microtubes for enhanced solar energy utilization efficiency

2017 ◽  
Vol 43 (9) ◽  
pp. 6822-6830 ◽  
Author(s):  
Wutao Mao ◽  
Zhengdao Li ◽  
Keyan Bao ◽  
Kaijun Zhang ◽  
Weibo Wang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Tin Oxide ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Solar Energy Utilization

Carbon Emission of Mining Industry’s Energy Consumption in Heilongjiang Province

2015 ◽  
Vol 1092-1093 ◽  
pp. 1597-1600
Author(s):  
Zhong Hua Wang ◽  
Xin Ye Chen
Keyword(s):  
Energy Consumption ◽  
Carbon Emissions ◽  
Carbon Emission ◽  
Industrial Structure ◽  
Mining Industry ◽  
Calculation Model ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Heilongjiang Province ◽  
Low Carbon

The need to reduce carbon emission in Heilongjiang Province of China is urgent challenge facing sustainable development. This paper aims to make explicit the problem-solving of carbon emission to find low carbon emission ways. According to domestic and foreign literatures on estimating and calculating carbon emissions and by integrating calculation methods of carbon emissions, it was not possible to consider all of the many contributions to carbon emissions. Calculation model of carbon emissions suitable to this paper is selected. The carbon emissions of energy consumption in mining industry are estimated and calculated from 2005 to 2012, and the characteristics of carbon emission are analyzed at the provincial level. It makes the point that carbon emissions of energy consumption in mining industry can be reduced when we attempt to alter energy consumption structure, adjust industrial structure and improve energy utilization efficiency.

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