Magnetic Polaronic and Bipolaronic Excitons in Mn(II) Doped (TDMP)PbBr4 and Their High Emission

The recent scenario of modern manufacturing is tremendously improved in the sense of precision machining and abstaining from environmental pollution and hazard issues. In the present work, Ti6Al4V is machined through wire EDM (WEDM) process with powder mixed dielectric and analyzed the influence of input parameters and inherent hazard issues. WEDM has different parameters such as peak current, pulse on time, pulse off time, gap voltage, wire speed, wire tension and so on, as well as dielectrics with powder mixed. These are playing an essential role in WEDM performances to improve the process efficiency by developing the surface texture, microhardness, and metal removal rate. Even though the parameter’s influencing, the study of environmental effect in the WEDM process is very essential during the machining process due to the high emission of toxic vapour by the high discharge energy. In the present study, three different dielectric fluids were used, including deionised water, kerosene, and surfactant added deionised water and analysed the data by taking one factor at a time (OFAT) approach. From this study, it is established that dielectric types and powder significantly improve performances with proper set of machining parameters and find out the risk factor associated with the PMWEDM process.

Download Full-text

Tetraphenylbenzene-based AIEgens: the Horizontally Oriented Emitters for highly Efficient Non-doped Deep Blue OLEDs and Host for High-Performance Hybrid WOLEDs

10.26434/chemrxiv.11887026 ◽

2020 ◽

Author(s):

Pengbo Han ◽

Zeng Xu ◽

Chengwei Lin ◽

Dongge Ma ◽

Anjun Qin ◽

...

Keyword(s):

High Performance ◽

General Strategy ◽

Flat Panel Displays ◽

Light Emitting ◽

Horizontal Orientation ◽

Deep Blue ◽

Full Color ◽

High Emission ◽

White Oleds ◽

Low Efficiency

Deep blue organic-emitting fluorophores are crucial for application in white lighting and full color flat-panel displays but emitters with high color quality and efficiency are rare. Herein, novel deep blue AIE luminogens (AIEgens) with various donor units and an acceptor of cyano substituted tetraphenylbenzene (TPB) cores were developed and used to fabricate non-doped deep blue and hybrid white organic light-emitting diodes (OLEDs). Benefiting from its high emission efficiency and high proportion of horizontally oriented dipoles in the film state, the non-doped deep blue device based on CN-TPB-TPA realized a maximum external quantum efficiency 7.27%, with a low efficiency roll-off and CIE coordinates of (0.15, 0.08). Moreover, efficient two-color hybrid warm white OLEDs (CIEx,y = 0.43, 0.45) were achieved using CN-TPB-TPA as the blue-emitting layer and phosphor doped host, which realized maximum current, power, external quantum efficiencies 58.0 cd A-1, 60.7 lm W-1 and 19.1%, respectively. This work provides a general strategy to achieve high performance, stable deep blue and hybrid white OLEDs by construction of AIEgens with excellent horizontal orientation

Download Full-text

The Effect of Dry Mix Sodium Hydroxide onto Workability and Compressive Strength of Geopolymer Paste

International Journal of Integrated Engineering ◽

10.30880/ijie.2020.12.09.014 ◽

2020 ◽

Vol 12 (9) ◽

Author(s):

A. Z. Mohd Ali ◽

◽

N. A. Jalaluddin ◽

N. Zulkiflee ◽

◽

...

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Sodium Hydroxide ◽

Sodium Silicate ◽

Alkaline Solution ◽

High Emission ◽

New Material ◽

Curing Regime ◽

Solid Form ◽

Geopolymer Paste

The production of ordinary Portland cement (OPC) consumes considerable amount of natural resources, energy and at the same time contribute in high emission of CO2 to the atmosphere. A new material replacing cement as binder called geopolymer is alkali-activated concrete which are made from fly ash, sodium silicate and sodium hydroxide (NaOH). The alkaline solution mixed with fly ash producing alternative binder to OPC binder in concrete named geopolymer paste. In the process, NaOH was fully dissolved in water and cooled to room temperature. This study aims to eliminate this process by using NaOH in solid form together with fly ash before sodium silicate liquid and water poured into the mixture. The amount of NaOH solids were based on 10M concentration. The workability test is in accordance to ASTM C230. Fifty cubic mm of the geopolymer paste were prepared which consists of fly ash to alkaline solution ratio of 1: 0.5 and the curing regime of 80℃ for 24 hours with 100% humidity were implemented. From laboratory test, the workability of dry method geopolymer paste were decreased. The compressive strength of the dry mix of NaOH showed 55% and the workability has dropped to 58.4%, it showed strength reduction compared to the wet mix method.

Download Full-text

Impact Load Buffering Method Based on Stress Wave Attenuation Principle

International Journal of Applied Mechanics ◽

10.1142/s1758825119500194 ◽

2019 ◽

Vol 11 (02) ◽

pp. 1950019 ◽

Cited By ~ 2

Author(s):

Lin Gan ◽

He Zhang ◽

Cheng Zhou ◽

Lin Liu

Keyword(s):

Stress Wave ◽

Wave Attenuation ◽

Impact Load ◽

Dynamics Simulation ◽

Scanning System ◽

Isolation Method ◽

Element Analysis ◽

System A ◽

High Emission ◽

The Impact

Rotating scanning motor is the important component of synchronous scanning laser fuze. High emission overload environment in the conventional ammunition has a serious impact on the reliability of the motor. Based on the theory that the buffer pad can attenuate the impact stress wave, a new motor buffering Isolation Method is proposed. The dynamical model of the new buffering isolation structure is established by ANSYS infinite element analysis software to do the nonlinear impact dynamics simulation of rotating scanning motor. The effectiveness of Buffering Isolation using different materials is comparatively analyzed. Finally, the Macht hammer impact experiment is done, the results show that in the experience of the 70,000[Formula: see text]g impact acceleration, the new buffering Isolation method can reduce the impact load about 15 times, which can effectively alleviate the plastic deformation of rotational scanning motor and improve the reliability of synchronization scanning system. A new method and theoretical basis of anti-high overload research for Laser Fuze is presented.

Download Full-text

Scenario Analyses of Exhaust Emissions Reduction through the Introduction of Electric Vehicles into the City

Energies ◽

10.3390/en14072030 ◽

2021 ◽

Vol 14 (7) ◽

pp. 2030

Author(s):

Marianna Jacyna ◽

Renata Żochowska ◽

Aleksander Sobota ◽

Mariusz Wasiak

Keyword(s):

Inner City ◽

Electric Vehicles ◽

Transport Model ◽

Exhaust Emissions ◽

Scenario Analyses ◽

High Emission ◽

Clean Air ◽

The One ◽

The City

In recent years, policymakers of urban agglomerations in various regions of the world have been striving to reduce environmental pollution from harmful exhaust and noise emissions. Restrictions on conventional vehicles entering the inner city are being introduced and the introduction of low-emission measures, including electric ones, is being promoted. This paper presents a method for scenario analysis applied to study the reduction of exhaust emissions by introducing electric vehicles in a selected city. The original scenario analyses relating to real problems faced by contemporary metropolitan areas are based on the VISUM tool (PTV Headquarters for Europe: PTV Planung Transport Verkehr AG, 76131 Karlsruhe, Germany). For the case study, the transport model of the city of Bielsko-Biala (Poland) was used to conduct experiments with different forms of participation of electric vehicles on the one hand and traffic restrictions for high emission vehicles on the other hand. Scenario analyses were conducted for various constraint options including inbound, outbound, and through traffic. Travel time for specific transport relations and the volume of harmful emissions were used as criteria for evaluating scenarios of limited accessibility to city zones for selected types of vehicles. The comparative analyses carried out showed that the introduction of electric vehicles in the inner city resulted in a significant reduction in the emission of harmful exhaust compounds and, consequently, in an increase in the area of clean air in the city. The case study and its results provide some valuable insights and may guide decision-makers in their actions to introduce both driving ban restrictions for high-emission vehicles and incentives for the use of electric vehicles for city residents.

Download Full-text

An Efficient Hybrid Algorithm for Energy Expenditure Estimation for Electric Vehicles in Urban Service Enterprises

Energies ◽

10.3390/en14072004 ◽

2021 ◽

Vol 14 (7) ◽

pp. 2004

Author(s):

Mariusz Izdebski ◽

Marianna Jacyna

Keyword(s):

Energy Expenditure ◽

Electric Vehicles ◽

Hybrid Algorithm ◽

Ant Colony Algorithm ◽

Environmental Safety ◽

Utility Company ◽

Service Companies ◽

Charging Time ◽

Urban Service ◽

High Emission

The article deals with the decision problems of estimating the energy expenditure of low-emission fleets in urban service companies due to environmental safety. One of the most important problems of today’s transport policy of many city authorities is the ecological safety of its inhabitants. The basic measures are aimed at banning high-emission vehicles from city centers and promoting the introduction of zero-emission vehicles, such as electric or hybrid cars. The authors proposed an original approach to the decision model, in which the energy expenditure from the use of electric vehicles was defined as a criterion function. The boundary conditions took into account limitations typical of an electric vehicle, e.g., maximum range or battery charging time. To solve the problem, the authors proposed an efficient hybrid algorithm based on ant colony algorithm and genetic algorithm. The verification was made for the example of a utility company serving a medium-sized city in the eastern part of Poland.

Download Full-text

Agricultural subsidies and global greenhouse gas emissions

Nature Communications ◽

10.1038/s41467-021-22703-1 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

David Laborde ◽

Abdullah Mamun ◽

Will Martin ◽

Valeria Piñeiro ◽

Rob Vos

Keyword(s):

Agricultural Production ◽

Ghg Emissions ◽

Farming Systems ◽

Government Support ◽

Consumer Prices ◽

High Emission ◽

The Government ◽

Agriculture And Food ◽

The Impact ◽

Global Emissions

AbstractAgricultural production is strongly affected by and a major contributor to climate change. Agriculture and land-use change account for a quarter of total global emissions of greenhouse gases (GHG). Agriculture receives around US$600 billion per year worldwide in government support. No rigorous quantification of the impact of this support on GHG emissions has been available. This article helps fill the void. Here, we find that, while over the years the government support has incentivized the development of high-emission farming systems, at present, the support only has a small impact in terms of inducing additional global GHG emissions from agricultural production; partly because support is not systematically biased towards high-emission products, and partly because support generated by trade protection reduces demand for some high-emission products by raising their consumer prices. Substantially reducing GHG emissions from agriculture while safeguarding food security requires a more comprehensive revamping of existing support to agriculture and food consumption.

Download Full-text

Effects of emission trading schemes on corporate carbon productivity and implications for firm-level responses

Scientific Reports ◽

10.1038/s41598-021-91193-4 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Hail Jung ◽

Seyeong Song ◽

Young-Hwan Ahn ◽

Ha Hwang ◽

Chang-Keun Song

Keyword(s):

Emission Trading ◽

Green Technologies ◽

Firm Level ◽

Investment Policies ◽

South Korean ◽

High Emission ◽

Trading Scheme ◽

Corporate Profits ◽

Carbon Productivity ◽

Conflicting Goals

AbstractSince the South Korean government enacted the Emission Trading Scheme (ETS), companies have been striving to simultaneously improve productivity and reduce carbon emissions, which represent conflicting goals. We used firm-level emissions and corporate variables to investigate how ETS enactment has affected carbon productivity, which is a firm-level revenue created per unit of carbon emission. Results showed that firm-level carbon productivity increased significantly under the ETS, and such a trend was more evident for high-emission industries. We also found that companies with high carbon productivity were (1) profitable, (2) innovative, and (3) managed by CEOs with experience in environmental fields. These findings suggest that to achieve the conflicting goals of increasing corporate profits while reducing emissions, firms have to invest in green technologies, and such decisions are supported by green leadership. Our findings also have implications for corporate leadership; data highlight the importance of managing human resources and deploying investment policies to respond to ETS.

Download Full-text

Physical Conditions in the Compact Planetary Nebula Sw St 1

Symposium - International Astronomical Union ◽

10.1017/s0074180900094225 ◽

1983 ◽

Vol 103 ◽

pp. 520-520

Author(s):

M. Cohen ◽

D.R. Flower ◽

A. Goharji

Keyword(s):

Electron Density ◽

Planetary Nebula ◽

Emission Measure ◽

Emission Feature ◽

Radio Observations ◽

Physical Conditions ◽

Infra Red ◽

High Emission

Sw St 1 is a compact and possibly young planetary nebula which has been recently observed at infra red (Aitken et al., 1979) and radio (Kwok et al., 1981) wavelengths. In the 8-13 μm region, a silicate emission feature is observed, suggesting that the nebular envelope is oxygen rich. The high emission measure determined from the radio observations implies a large value for the electron density.

Download Full-text

Green Light Emission ofZnxCd1-xSeNanocrystals Synthesized by One-Pot Method

Journal of Nanomaterials ◽

10.1155/2013/526862 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9 ◽

Cited By ~ 7

Author(s):

Shu-Ru Chung ◽

Kuan-Wen Wang ◽

Hong-Shuo Chen

Keyword(s):

Particle Size ◽

Optical Properties ◽

Light Emission ◽

Green Light ◽

Particle Size Effect ◽

Partial Replacement ◽

Face Centered Cubic ◽

One Pot ◽

Zn Content ◽

High Emission

We present a facile one-pot synthesis to prepare ternaryZnxCd1-xSe(x= 0.2, 0.5, 0.8, and 1) nanocrystals (NCs) with high emission quantum yield (QY, 45~89%). The effect of Zn content (x) ofZnxCd1-xSeNCs on their physical properties is investigated. The NCs have a particle size of 3.2 nm and face centered cubic structure. However, the actual compositions of the NCs are Zn0.03Cd0.97Se, Zn0.11Cd0.89Se, and Zn0.38Cd0.62Se when Zn content is 0.2, 0.5, and 0.8, respectively. In terms of the optical properties, the emission wavelength shifts from 512 to 545 nm with increasing Zn content from 0 to 0.8 while the QY changes from 89 to 45, respectively. Partial replacement of Cd by Zn is beneficial to improve the QY of Zn0.2and Zn0.5NCs. The optical properties of ternary NCs are affected by compositional effect rather than particle size effect.

Download Full-text