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Investigation And Simutation On The Model And Prevention Technology Of Water Inrush From Roof Bed Separation, Zhang Wenquan, Wang Zaiyong, Wu Xintao, Shao Jianli, Lei Yu, Wu Xunan

Coal Geology & Exploration

In order to prevent water inrush from roof separation, a partial backfill scheme is proposed for simulation study. First of all, based on the existing data, many kinds of separation water inrush accidents occurred in China were summarized and analyzed, and the disaster model of separation water accumulation was studied deeply. Then, taking the separation water accident of 1307 working face in the first mining area of a mine in Shaanxi Province as an example, the hydrogeological conditions and the relationship between upper aquifer and separation water inrush were analyzed, and the development characteristics of roof separation space of working …

Experiment Investigation On The Influence Of Mixing Effect On Dispersion Scale Dependence, Ma Ziqi, Dai Zhenxue, Dong Shuning, Wang Hao, Liu Xiaoqian

Coal Geology & Exploration

Dispersivity, a property parameter defined to characterize the degree of dispersion and mixing, is crucial for the prediction and remediation of groundwater contamination. However, in field tracer tests, the real mixing effect has often been ignored. In this paper, an aquifer with horizontal layered structure was simulated by laboratory experiments. Three kinds of media were chosen to reconstructed experimental aquifer. Two monitoring methods, buried sensor and sensor in the well, were adopted to compare the difference of breakthrough curves, so as to investigate the influence of mixing effect in the well on the dispersion scale dependence. The results showed that …

Design And Analysis Of Hole-Forming Technology For Surface Large Diameter Emergency Rescue Borehole, Hao Shijun, Mo Haitao

Coal Geology & Exploration

Surface large diameter borehole can be used as the escape channel for trapped people underground, and it is one of the important emergency rescue plans when mine accidents cause people trapped underground. However, the conventional large-diameter engineering hole is mainly formed by mud positive circulation and multi-stage reaming, which can not meet the rescue requirements. Focusing on the purpose of rescue and escape of large-diameter hole, this paper expounds the hole forming technology design principles including accurate connecting roadway, optimization of borehole structure, high-efficiency hole forming and safety connecting roadway. According to the specific construction conditions of overburden drilling, second …

Developing Ocean Negative Carbon Emission Technology To Support National Carbon Neutralization., Nianzhi Jiao

Bulletin of Chinese Academy of Sciences (Chinese Version)

Carbon neutrality is the right means to cope with global warming. The basic approaches to achieve carbon neutralization include reducing CO2 emissions to the atmosphere and increasing carbon sinks or negative emissions (absorption of atmospheric CO2). As a developing country and a big emitter, China should try its best to increase carbon sinks while reducing emissions as much as possible. The ocean is the largest active carbon pool on Earth, with great potentials for carbon negative emission. We have established marine carbon sequestration theory, which has laid solid foundation for negative emission and set up the linkage between science and …

Trends Observation: Development And Strategy Of Global Eco-Environment And Resources Researching

Bulletin of Chinese Academy of Sciences (Chinese Version)

No abstract provided.

Renewable Energy And Trade: Meeting The Paris Agreement’S Goals Through A Two-Step Jurisprudential Advance, Lisa Benjamin

Minnesota Journal of Law, Science & Technology

No abstract provided.

Experimental Study Of Co2 Injection Into Carbonate Depleted Field: A Case Study From Central Luconia Field, Sarawak, East Malaysia, Nur Zafirah Mat Razali

Student Works (2020-2029)

This study aimed to address the challenges and strategies to determine the critical rate of CO2 injection into carbonate depleted gas fields. In this research, the critical rate is the maximum allowable injection rate before formation damage initiation. The cause of formation damage could be due to in-situ mobilization or trapping of migratory fines resulting in plugging of the flow path. This study performed a thorough investigation of a different rock-fluid system to evaluate the safe injection limit, as the critical rate is different for each rock-fluid system. The geochemical effect of CO2 injection toward carbonate formation was also investigated …

Trends Observation: Observation On Trends Of Energy Strategy And Energy S&T System Reform In Major Economies

Bulletin of Chinese Academy of Sciences (Chinese Version)

No abstract provided.

Modelling And Analysis Of Performance For Biogas Fuelled Gas Engine Using Matlab, Indran Kunusilin

Student Works (2020-2029)

A wide-ranging performance evaluation of a multi-cylinder gas engine operating wit biogas as a fuel were studied based on its performance parameters such as effective power, torque, SFC, MEP and Thermal Efficiency and its HRR analysis with the aid of modeling software, MATLAB. The analysis and performance study were used based on the thermodynamic model of an Otto cycle, which is based on the gas engines used. Parameters such as cylinder pressure with domain of crank angle and heat addition model (using Wiebe function ) were studied to model the and analyze the HRR .Besides that , the contributing factors …

Study On Engine Performance And Exhaust Pollutant Using Isobutanol - Calophyllum Inophyllum Biodiesel - Diesel Ternary Blends In A Diesel Engine, Mohd Azham Mohd Alwi

Student Works (2020-2029)

Renewable energy sources such as biodiesel and bio-alcohol are desirable and are alternative to meet energy demand and control emission, from renewable sources such as ethanol, methanol, butanol, and pentanol. Biodiesel has a notable interest in offering many advantages with few disadvantages and needs to be extended for comprehensive use. Applying greater alcohols such as butanol with biodiesel in fuel blends is a beneficial technic to enhance the fuel characteristics and use biodiesel and alcohol efficiently. Isobutanol is an organic compound that has very low volatility, higher-chain alcohols have energy densities close to gasoline. It is not as volatile or …

Effect Of Cloud Cover On Optimum Orientations Of Fixed Solar Panels For Maximum Yearly Energy Collection, Prethew Prasad

Browse all Theses and Dissertations

The amount of cloud cover present in the sky is a significant factor when determining the solar radiation impinging on a solar panel. The optimum tilt required to achieve maximum energy impingement on a surface is also influenced by the amount of cloud cover. This work presents a method for determining the optimum tilt angle for a fixed solar panel when a set amount of cloud cover is present in the sky. Fixed tilt angles that have the most incident solar energy over the course of a year as a function of cloud cover, latitude, and azimuthal angle orientation are …

Development Of A Computer Model To Simulate Battery Performance For Use In Renewable Energy Simulations, Arjun Sundararajan

Browse all Theses and Dissertations

Renewable and clean energy has been the driving force behind the booming storage industry. The need for producing energy from clean and quickly replenishable energy sources has never been as high as it is now. However, renewable energy only supplies a little over a quarter of the world’s electricity needs and much less of the world’s total energy requirements. One reason is the intermittent nature of renewable energy. Inexpensive and convenient storage technologies are required to solve this issue. It is believed that batteries offer the most viable solution to conquer the problem of renewable energy intermittency. To aid the …

Valorization Of Xylan In Agroforestry Waste Streams, Harrison Appiah

Graduate Theses, Dissertations, and Problem Reports (ETD)

Valorization of Xylan in Agroforestry Waste Streams.

Harrison Appiah

Microwave-assisted deep eutectic solvent and gamma-valerolactone metallic chloride catalyzed conversion of xylan to furfural were investigated using a 2x3 factorial experimental design at two levels of percent microwave power, reaction time, and catalyst concentration. The levels of each factor studied were (20%, 60% microwave power, 2, 4 minutes, and 10, 20mg) respectively. The effect of three metallic chloride catalysts (LiCl, FeCl3.6H20, CuCl2) on the conversion of xylan to furfural was also investigated. The gamma-valerolactone-ferric chloride sent system exhibited the highest mean yield of furfural (56.50%). The next highest furfural yield of …

The Eicda: What Is It, And Why Is It Right For Nebraska?, Samantha Markus

Op-Eds from ENSC230 Energy and the Environment: Economics and Policies

For decades, humans have been pumping greenhouses gases into the atmosphere, and we are finally starting to see some of the damages. Global temperature has risen 1.76°F when compared to the twentieth century. Within Nebraska, we are seeing an increase in heavy rain events and extreme hot days, both of which negatively impact agriculture. These changes are becoming more devastating as each year passes with no action.

“Developing Nations Should Not Rush To Renewable Energies”, Alisson Ntwali

Op-Eds from ENSC230 Energy and the Environment: Economics and Policies

The Conference of Parties 26 (COP26)’s purpose was to bring countries together to accelerate action towards the goals of the Paris Agreement and the UN Framework Convention on Climate Change to limit the average global temperature rise to 1.5 degrees Celsius compared to pre-industrial levels.

Biden’S “Blue” Hydrogen Plan Is Not The Answer, Ryan Martz

Op-Eds from ENSC230 Energy and the Environment: Economics and Policies

The excitement about hydrogen as a fuel and energy source is similar to buying an electric vehicle (EV) thinking it will reduce your personal CO₂ emissions. On the surface, it seems great! No greenhouse gas emissions while driving is certainly better than the greenhouse gasses released from a normal combustion engine car, but when you consider other effects, it’s no longer as great. What if the grid that you plug your EV into is powered primarily by coal? What about the environmental and human rights impacts of mining the materials to make the batteries? What about the lack of …

Loss And Damage: The $100 Billion Promise ‘The Leaders’ Failed To Keep, Abbie Williams

Op-Eds from ENSC230 Energy and the Environment: Economics and Policies

100 billion dollars, the amount develOp-ed nations were supposed to pay less develOp-ed nations by 2020, the promise they failed to keep. The promise that was revisited at COP26 in Glasgow. The climate finance fund is funds from more develOp-ed nations to less develOp-ed nations to help with transitioning to a green economy so there is no need for reliance on fossil fuels. This fund consists of both loans and grants.

Solar Panels: Are Aesthetics More Important Than The Environment?, Madison Kinkaid

Op-Eds from ENSC230 Energy and the Environment: Economics and Policies

Imagine you decide to install solar panels on your house. You want to do your part in combating the climate crisis as well as save your family money. You’ve done your research about which panels to get and exactly how to position them on your home. Then you find out that your neighborhood doesn’t allow solar panels because someone decades ago decided they weren’t aesthetically pleasing.

It's About Time Nebraska Ditches Coal, Riley Johnson

Op-Eds from ENSC230 Energy and the Environment: Economics and Policies

For too long now, Nebraska has relied on coal from our western neighbor, Wyoming. While this proximity to Wyoming’s coal mines has led to cheap coal and cheap energy prices, it has made us reliant on out-of-state coal companies. It's great that energy is kept cheap using coal, but all of our money is getting sent out of state. Why send all of our money out-of-state when we can keep Nebraskan’s hard-earned money in Nebraska. Our beautiful state has an extremely large potential for renewable energy that we fail to utilize.

30 By 30, Laron Core

Op-Eds from ENSC230 Energy and the Environment: Economics and Policies

Biden’s 30 by 30 plan, a regulatory approach to conservation, an imminent response to environmental action, a promise of inclusivity to all stakeholders. Or a broken promise in the making, an environmental policy inadequate to deliver sufficient results to its stakeholders? I am set to believe Biden’s 30 by 30 plan could very well be DOA.

Strategies To Control Costs At U.S. Commercial Nuclear Power Plants, Gregory J. Lindamood

Walden Dissertations and Doctoral Studies

Commercial nuclear power plants in the United States are not cost competitive because of high operating and maintenance costs and historically low natural gas prices, resulting in the potential for premature plant closure of up to 25% of the operating power plants by 2025. Premature plant closure could impact the consumer through higher electricity rates, increased air pollution, and electric grid instability from increased renewable usage. Grounded in the behavioral decision theory, the purpose of this qualitative single case study was to explore successful strategies nuclear leaders used to control costs and ensure competitiveness. Data were collected through semistructured interviews …

Small And Medium Enterprises’ Green Energy Strategies For Profitability, Ekok Ajom Okpokam

Walden Dissertations and Doctoral Studies

Lack of business strategies can negatively impact the generation of green energy, which may hinder business profitability and growth. Managers of small and medium enterprises (SMEs) who struggle to generate green energy to increase profitability are at high risk of their business failure. Grounded in the diffusion of innovation theory, the purpose of this qualitative multiple case study was to explore the business strategies managers of SMEs use to generate green energy to increase profitability. The participants were three SME managers in three energy companies in Lagos, Nigeria, who effectively used business strategies to generate green energy to increase profitability. …

Residential Demand Side Management: Strategies For Increasing Electric Utility Profitability, Alexandra Rose Bennett

Walden Dissertations and Doctoral Studies

Some electric utility leaders lack effective strategies to reduce demand billing charges. Utility leaders are concerned with lowering demand billing charges, as failure to do so can negatively affect profitability. Guided by the operations management theory, the purpose of this qualitative multiple case study was to explore strategies that distribution electric utility managers use to reduce demand billing chargers from their power providers. The participants were three electric utility leaders working in the Midwest United States who used successful residential demand-side management (DSM) strategies. Data were collected using semistructured interviews and utility documents to address the research question. The collected …

Novel Design And Facile Synthesis Of Functional Nanostructures For Energy And Environmental Application, Zhuojun Wang

Wayne State University Theses

Environmental pollution and energy crisis are two of the major obstacles in the development of a more sustainable society. It is an interesting but technically challenging task to design novel methods for the facile and scalable synthesis of multifunctional materials for applications in both energy storage and environmental remediation. In this thesis, I tried to design and synthesize novel nanostructured materials for energy and environmental applications, achieved highly promising results. I developed a facile electrochemical approach to synthesize the zinc oxide with the zinc element for photocatalytic reactions. It demonstrated dramatically improved performances in degradation of organic pollutant in water, …

Policy Analysis Of Emissions Cap And Trade: The United State And The European Union, Drew Bealby

Master's Theses or Doctor of Nursing Practice

Effects of climate change are appearing each day therefore proactive steps need to be made to reduce these effects. The National Aeronautics and Space Administration (NASA) notes that humans producing greenhouse gases (GHGs) such as carbon dioxide (CO₂), methane, and nitrous oxide are the main reason the Earth’s overall temperature is rising (NASA 2019). A policy analysis was done on the European Union Emissions Trading Scheme (EU ETS) along with comparisons to the United States’ emissions policies that are in place currently. The European Union (E.U.) itself is both an economic and political union of 27 countries in …

An Investigation Into Historical And Contemporary Breeding Occurrence Of The Ferruginous Hawk In Kansas, Erica Clark

Master's Theses or Doctor of Nursing Practice

The Ferruginous Hawk (Buteo regalis) is the largest Buteo species occurring in grasslands, nesting along bluffs, buttes and isolated trees. In Kansas, the Ferruginous Hawk is listed as a Species of Greatest Conservation Need, Tier II. A previous study on Ferruginous Hawks nesting in Kansas during the years of 1979 to 1987, with sporadic visits from the 1990s to 2000, revealed that the most productive nesting territories were inaccessible to predators, placed on rocky ledges and the surrounding landscape was over 50% rangeland. I revisited 82 of the 111 historic nest territories in the summers of 2019 and …

Petrographic And Core Analysis Of The Jurassic Norphlet Formation: A Case Study In The Lithofacies Control Of Diagenesis And Porosity In The Flomaton Field, Al, Jarrett Thomas Smith

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study includes a sedimentologic and petrographic study of cores and thin-sections from the Jurassic Norphlet Formation in the Flomaton Field in southern Alabama to define a specific paragenetic history of each facies encountered and to identify key controls on reservoir quality. Eolian dune, nearshore, sand flat, and wadi facies were likely encountered in Norphlet core and thin-section samples that displayed a high degree of heterogeneity between them in terms of porosity, grain contacts, cement abundance/type, intergranular volume, and overall diagenetic processes. These distinct petrographic differences suggest that the paragenesis in the Flomaton Field is primarily facies controlled. The eolian …

Computer Modeling Of Solar Thermal System With Underground Storage Tank For Space Heating, Mohammad Yousef Mousa Naser

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Space heating is required in almost every dwelling across the country for different periods of time. The thermal energy needed to meet a heating demand can be supplied using different conventional and/or renewable technologies. Solar energy is one example of a renewable resource that can be used for supplying heating needs. It can be utilized either by using photovoltaic panels to generate electricity, that in turn can be used to operate heaters, or by using solar thermal panels. Solar thermal panels obtain higher operating efficiencies than photovoltaic panels, but solar energy for heating purposes suffers from a mismatch between supply …

Utilizing Rotational Energy In Wind Turbine Blades With The Flywheel Mechanism And Predicting The Power Output By Neural Networking, Anamika Mishra

Browse all Theses and Dissertations

As we expand and innovate for better and safer living, there will always be a need for new energy sources. By replacing fossil fuels, renewable energy is becoming a viable option for primary power generation. That is why researchers are turning their attention to renewable energy sources and ways of making the most of them. WIND ENERGY is a promising renewable and clean energy source harvested from the wind which is plentiful on the planet. We already have the technology to harvest it, but the efficiency and power output are not optimal. In this thesis, to enhance the energy harvesting …

Utilizing Rotational Energy In Wind Turbine Blades With The Flywheel Mechanism And Predicting The Power Output By Neural Networking, Anamika Mishra

Browse all Theses and Dissertations

As we expand and innovate for better and safer living, there will always be a need for new energy sources. By replacing fossil fuels, renewable energy is becoming a viable option for primary power generation. That is why researchers are turning their attention to renewable energy sources and ways of making the most of them. WIND ENERGY is a promising renewable and clean energy source harvested from the wind which is plentiful on the planet. We already have the technology to harvest it, but the efficiency and power output are not optimal. In this thesis, to enhance the energy harvesting …