This study aimed to quantify the carbon footprint of the National University of Juliaca(UNAJ)for the year 2023,in order to identify the main sources of greenhouse gas(GHG)emissions and provide a foundation for impleme...This study aimed to quantify the carbon footprint of the National University of Juliaca(UNAJ)for the year 2023,in order to identify the main sources of greenhouse gas(GHG)emissions and provide a foundation for implementing sustainable policies.The methodology was based on the greenhouse gas inventory approach outlined in ISO 14064-1,applying the operational control method to measure both direct and indirect emissions.Data on energy consumption,transportation,and purchased goods and services were collected using digital tools and surveys,and emissions were calculated in metric tons of CO_(2)equivalent(tCO_(2)e).The results indicate that UNAJ’s total carbon footprint in 2023 was 1,461.03 tCO_(2)e,with per capita emissions of 0.47 tCO_(2)e per person.The main sources of emissions were transportation,accounting for 75.88%of total emissions,followed by the consumption of goods and services(14.29%)and energy use(5.12%).Despite limitations in solid waste management,the study makes a valuable contribution to the development of sustainability strategies,emphasizing the urgent need for sustainable mobility policies,energy efficiency measures,and the adoption of responsible procurement practices.Furthermore,it highlights the importance of achieving carbon neutrality at UNAJ as a key objective in mitigating its environmental impact.The findings provide relevant insights from the Peruvian context and offer a basis for analyzing emissions at local universities,with practical implications for enhancing environmental management in higher education institutions.展开更多
Density functional methods have been used for the calculation of electronic structures, electronic transitions, vertical electron affinities and intermolecular reorganization energies for tri-aryl substituted dibenzot...Density functional methods have been used for the calculation of electronic structures, electronic transitions, vertical electron affinities and intermolecular reorganization energies for tri-aryl substituted dibenzothiophenes. These model compounds were then compared to the predicted values for dibenzo[b,d]thiophen-2-yltriphenylsilane (DBTSI 2) and to dibenzo[b,d]thiophene-2,8-diylbis(diphenylphosphine oxide) (PO15), known electron transport molecules. The results indicate that these model compounds can be used in a blue OLED system.展开更多
Conductivity dopants with processing properties suitable for industrial applications are of importance to the organic electronics field. However, the number of commercially available organic molecular dopants is limit...Conductivity dopants with processing properties suitable for industrial applications are of importance to the organic electronics field. However, the number of commercially available organic molecular dopants is limited. The electron acceptor 2,3,5,6-tetrafluoro-7,7,8,8,-tetracyanoquinodimethane (F4-TCNQ) is the most utilized P-dopant;however, it has high volatility and a poor sticking coefficient, which makes it difficult to control doping levels and prevent vacuum system contamination. A design concept for P-type molecular dopants based on the TCNQ core which are substituted to improve processing properties without sacrificing the electronic properties necessary is presented. The correlation between the lowest unoccupied molecular orbital (LUMO) energy and the position of substitution as well as the choice of linker is evaluated. The position of substitution as well as the choice of linker has a significant effect on the electronic properties. However, the geometry of the substituted molecules was not significantly distorted from that of the parent F4-TCNQ, and the electron density was delocalized on the TCNQ core. We also put forward four possible molecular dopants with suitable energy levels.展开更多
文摘This study aimed to quantify the carbon footprint of the National University of Juliaca(UNAJ)for the year 2023,in order to identify the main sources of greenhouse gas(GHG)emissions and provide a foundation for implementing sustainable policies.The methodology was based on the greenhouse gas inventory approach outlined in ISO 14064-1,applying the operational control method to measure both direct and indirect emissions.Data on energy consumption,transportation,and purchased goods and services were collected using digital tools and surveys,and emissions were calculated in metric tons of CO_(2)equivalent(tCO_(2)e).The results indicate that UNAJ’s total carbon footprint in 2023 was 1,461.03 tCO_(2)e,with per capita emissions of 0.47 tCO_(2)e per person.The main sources of emissions were transportation,accounting for 75.88%of total emissions,followed by the consumption of goods and services(14.29%)and energy use(5.12%).Despite limitations in solid waste management,the study makes a valuable contribution to the development of sustainability strategies,emphasizing the urgent need for sustainable mobility policies,energy efficiency measures,and the adoption of responsible procurement practices.Furthermore,it highlights the importance of achieving carbon neutrality at UNAJ as a key objective in mitigating its environmental impact.The findings provide relevant insights from the Peruvian context and offer a basis for analyzing emissions at local universities,with practical implications for enhancing environmental management in higher education institutions.
文摘Density functional methods have been used for the calculation of electronic structures, electronic transitions, vertical electron affinities and intermolecular reorganization energies for tri-aryl substituted dibenzothiophenes. These model compounds were then compared to the predicted values for dibenzo[b,d]thiophen-2-yltriphenylsilane (DBTSI 2) and to dibenzo[b,d]thiophene-2,8-diylbis(diphenylphosphine oxide) (PO15), known electron transport molecules. The results indicate that these model compounds can be used in a blue OLED system.
文摘Conductivity dopants with processing properties suitable for industrial applications are of importance to the organic electronics field. However, the number of commercially available organic molecular dopants is limited. The electron acceptor 2,3,5,6-tetrafluoro-7,7,8,8,-tetracyanoquinodimethane (F4-TCNQ) is the most utilized P-dopant;however, it has high volatility and a poor sticking coefficient, which makes it difficult to control doping levels and prevent vacuum system contamination. A design concept for P-type molecular dopants based on the TCNQ core which are substituted to improve processing properties without sacrificing the electronic properties necessary is presented. The correlation between the lowest unoccupied molecular orbital (LUMO) energy and the position of substitution as well as the choice of linker is evaluated. The position of substitution as well as the choice of linker has a significant effect on the electronic properties. However, the geometry of the substituted molecules was not significantly distorted from that of the parent F4-TCNQ, and the electron density was delocalized on the TCNQ core. We also put forward four possible molecular dopants with suitable energy levels.
