scholarly journals Fermentative Succinate Production: An Emerging Technology to Replace the Traditional Petrochemical Processes

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Yujin Cao ◽  
Rubing Zhang ◽  
Chao Sun ◽  
Tao Cheng ◽  
Yuhua Liu ◽  
...  
Keyword(s):  
Production Cost ◽  
Production Systems ◽  
Strain Improvement ◽  
Downstream Processing ◽  
Energy Resources ◽  
Petrochemical Process ◽  
Succinate Production ◽  
Fossil Energy ◽  
Renewable Biomass ◽  
The Past

Succinate is a valuable platform chemical for multiple applications. Confronted with the exhaustion of fossil energy resources, fermentative succinate production from renewable biomass to replace the traditional petrochemical process is receiving an increasing amount of attention. During the past few years, the succinate-producing process using microbial fermentation has been made commercially available by the joint efforts of researchers in different fields. In this review, recent attempts and experiences devoted to reduce the production cost of biobased succinate are summarized, including strain improvement, fermentation engineering, and downstream processing. The key limitations and challenges faced in current microbial production systems are also proposed.

scholarly journals A Review on Transformerless Step-Up Single-Phase Inverters with Different DC-Link Voltage for Photovoltaic Applications

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3626 ◽  
Author(s):  
Wenjie Liu ◽  
Kamran Ali Khan Niazi ◽  
Tamas Kerekes ◽  
Yongheng Yang
Keyword(s):  
Single Phase ◽  
Power Conversion ◽  
Energy Systems ◽  
Energy Resources ◽  
Power Electronic ◽  
Power Electronic Converters ◽  
Fossil Energy ◽  
The Past ◽  
Photovoltaic Applications ◽  
Fast Development

Photovoltaic (PV) energy has been competitive in power generation as an alternative to fossil energy resources over the past decades. The installation of grid-connected solar energy systems is expected to increase rapidly with the fast development of the power electronics technology. As the key to the interface of the PV energy and the grid, power converters should be reliable, efficient and comply with the grid requirements. Considering the nature of PV energy, the power conversion should be flexible (e.g., high step-up DC-DC conversion and harmonic-free DC-AC conversion). Accordingly, many power electronic converters have been reported in literature. Compared with isolated inverters, transformerless inverters show great advantages. This paper thus presents an overview of the transformerless step-up single-phase inverters for PV applications based on the dc-link configurations. Grid-connected PV inverters are classified as constant dc-link voltage structures, pseudo-dc-link voltage structures, pulsating dc-link voltage structures and integrated dc-link voltage structures. The discussion on the composition of different dc-link structures is presented, which provides guidance to select appropriate transformerless inverter topologies for PV applications.

THREAT ASSESSMENT OF THE DEPLETION OF TRADITIONAL FUEL-ENERGY RESOURCES

2017 ◽  
Author(s):  
Nikolay Tymchenko ◽  
◽  
Nataliia Fialko ◽  
Keyword(s):  
Threat Assessment ◽  
Energy Resources ◽  
Mineral Deposits ◽  
Fossil Energy ◽  
Global Threat

The issues of the global threat seeing depletion of the main types of traditional fossil energy resources were analyzed. The data is given on the proven world reserves of these energy resources and the timing of their depletion. The theory of M.K. Hubbert on the depletion of mineral deposits is considered. The application of the theory to assess the reserves of fossil energy resources in different countries is analyzed.

scholarly journals Environmental assessment of the Tung cultivation through life cycle analysis

2014 ◽  
Vol 3 (1) ◽  
pp. 70 ◽  
Author(s):  
Marcelo Bern�l ◽  
Rosana Schneider ◽  
�nio Machado
Keyword(s):  
Life Cycle ◽  
Production Systems ◽  
Life Cycle Management ◽  
Assessment Method ◽  
Agroforestry Systems ◽  
Family Farms ◽  
Conventional Agriculture ◽  
The Past ◽  
Ecosystem Changes ◽  
Poor Soil

Over the past few decades, conventional agriculture has been facing serious crises caused by numerous factors, including poor soil management and the excessive application of pesticides. Thus, alternative production systems have been developed, including agroforestry systems, especially those that produce both energy and food. The objective of this study was to environmentally evaluate the culture of Aleurites fordii Hemls. (Tung) using the Life Cycle Assessment method with the SimaPro 7.3.2 software. The results revealed that in family farms that use less mechanization to harvest crops, the primary category of environmental impact was land use, which included the removal of animal and vegetable species and ecosystem changes. The full impact of this category was 1741.21 m2yr PDF (potentially disappeared fraction). Subsequently, prognostics were established for the reduction of such impacts, and we conclude that Tung has a high potential for agricultural installation with high responsibility to the environment. Keywords: Environmental factors, Aleurites fordii Hemls, Life Cycle Management, Tung.

Energy, Environment, and Security: Critical Links in a Post-Peak World

2010 ◽  
Vol 10 (4) ◽  
pp. 79-100 ◽  
Author(s):  
Shane Mulligan
Keyword(s):  
Human Ecology ◽  
Energy Security ◽  
Fossil Fuel ◽  
Energy Resources ◽  
Ecological Security ◽  
Fossil Energy ◽  
Political Analysis ◽  
Global Environmental Politics ◽  
Global Environmental ◽  
Energy Environment

Energy supplies are central to human ecology and key to the sustainability of human communities, but the decline of fossil fuel resources is largely ignored in global environmental politics. Most political analysis of energy focuses on state-centered “energy security” while largely overlooking discourses of environmental or ecological security. Yet energy and the environment are intimately connected; in the 1970s and 1980s, energy resources were seen as very much a part of the environment to be secured, while today fossil energy is seen as an evident threat to the environment, especially through the medium of climate change. This article surveys the changing relationships among energy, the environment, and security, and suggests a framework for examining the discursive forces that have affected such changes. This framework offers guidance toward developing a more ecologically informed approach to energy and (state, global, and human) security under conditions of scarce and declining global fossil fuel supplies.

scholarly journals Application of Microalgal Stress Responses in Industrial Microalgal Production Systems

Marine Drugs ◽  
2021 ◽  
Vol 20 (1) ◽  
pp. 30
Author(s):  
Jia Wang ◽  
Yuxin Wang ◽  
Yijian Wu ◽  
Yuwei Fan ◽  
Changliang Zhu ◽  
...  
Keyword(s):  
Stress Responses ◽  
Production Systems ◽  
Strain Improvement ◽  
Value Added ◽  
Product Yield ◽  
Adaptive Laboratory Evolution ◽  
Laboratory Evolution ◽  
Theoretical Support ◽  
Further Development ◽  
Value Added Products

Adaptive laboratory evolution (ALE) has been widely utilized as a tool for developing new biological and phenotypic functions to explore strain improvement for microalgal production. Specifically, ALE has been utilized to evolve strains to better adapt to defined conditions. It has become a new solution to improve the performance of strains in microalgae biotechnology. This review mainly summarizes the key results from recent microalgal ALE studies in industrial production. ALE designed for improving cell growth rate, product yield, environmental tolerance and wastewater treatment is discussed to exploit microalgae in various applications. Further development of ALE is proposed, to provide theoretical support for producing the high value-added products from microalgal production.

scholarly journals 8.6. Analysis of the development trend of energy strategies of the BRICS member countries in the field of energy resources use

2020 ◽  
Author(s):  
Ц. Чжоу
Keyword(s):  
Resource Use ◽  
Renewable Energy Sources ◽  
Development Trend ◽  
Energy Resources ◽  
Added Value ◽  
Fossil Energy ◽  
Consumption Structure ◽  
The Difference ◽  
The Development Trend ◽  
Energy Strategies

В данной статье авторы обозначили, что страны – члены БРИКС определили повышение эффективности использования ресурсов как одно из своих приоритетных направлений развития. Различие между странами состоит в том, что Российская Федерация как основной поставщик и экспортер энергии уделяет больше внимания увеличению использования ископаемой энергии за счет увеличения ее добавленной стоимости, остальные же страны – члены БРИКС (с дефицитом энергоресурсов) трансформируют свою структуру потребления энергии, сокращая использование угля за счет увеличения использования возобновляемых источников энергии. In this article, the authors indicated that the BRICS member countries have identified improving the efficiency of resource use as one of their priority areas of development. The difference between the countries is that Russia, as the main supplier and exporter of energy, pays more attention to increasing the use of fossil energy by increasing the added value of energy, while the rest of the BRICS member countries (with a shortage of energy resources) transform their energy consumption structure by reducing the use of coal by increasing the use of renewable energy sources.

Status of Deepwater Production Systems

1991 ◽  
Vol 28 (01) ◽  
pp. 39-45
Author(s):  
Edward E. Horton
Keyword(s):  
Gulf Of Mexico ◽  
Oil And Gas ◽  
Production Systems ◽  
Energy Resources ◽  
Innovative Technology ◽  
Oil Exploration ◽  
Exploration And Production ◽  
Near Future

As oil exploration and production moves farther offshore, innovative technology is required to exploit energy resources in ever deeper waters. This paper covers two areas of deepwater production: offshore Brazil and the Gulf of Mexico. The types of wells and their capacity are described as well as the alternative platform designs, both fixed and semisubmersible, being used to recover both oil and gas from depths greater than 1500 ft. The paper outlines why these deepwater regions are of interest now and describes developments that are expected in the near future.

scholarly journals A Feasibility Study of Cellulosic Isobutanol Production—Process Simulation and Economic Analysis

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 667 ◽  
Author(s):  
Avraam Roussos ◽  
Nikiforos Misailidis ◽  
Alexandros Koulouris ◽  
Francesco Zimbardi ◽  
Demetri Petrides
Keyword(s):  
Energy Demand ◽  
Production Cost ◽  
Fossil Fuels ◽  
Raw Materials ◽  
Downstream Processing ◽  
Economic Feasibility ◽  
Unit Production Cost ◽  
Product Titer ◽  
Product Removal ◽  
The Cost

Renewable liquid biofuels for transportation have recently attracted enormous global attention due to their potential to provide a sustainable alternative to fossil fuels. In recent years, the attention has shifted from first-generation bioethanol to the production of higher molecular weight alcohols, such as biobutanol, from cellulosic feedstocks. The economic feasibility of such processes depends on several parameters such as the cost of raw materials, the fermentation performance and the energy demand for the pretreatment of biomass and downstream processing. In this work, two conceptual process scenarios for isobutanol production, one with and one without integrated product removal from the fermentor by vacuum stripping, were developed and evaluated using SuperPro Designer®. In agreement with previous publications, it was concluded that the fermentation titer is a crucial parameter for the economic competitiveness of the process as it is closely related to the energy requirements for product purification. In the first scenario where the product titer was 22 g/L, the energy demand for downstream processing was 15.8 MJ/L isobutanol and the unit production cost of isobutanol was $2.24/L. The integrated product removal by vacuum stripping implemented in the second scenario was assumed to improve the isobutanol titer to 50 g/L. In this case, the energy demand for the product removal (electricity) and downstream processing were 1.8 MJ/L isobutanol and 10 MJ/L isobutanol, respectively, and the unit production cost was reduced to $1.42/L. The uncertainty associated with the choice of modeling and economic parameters was investigated by Monte Carlo simulation sensitivity analysis.

scholarly journals Special Issue: Integrated Pest Management in Arable and Open Field Horticultural Crops

Insects ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 82
Author(s):  
Andrew G. S. Cuthbertson
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Open Field ◽  
Pest Control ◽  
Production Systems ◽  
Special Issue ◽  
Horticultural Crops ◽  
The Past ◽  
Chemical Products ◽  
Invertebrate Pests

Invertebrate pest control within both agricultural and horticultural production systems continues to present many challenges. Over the past decades the commonly used method for pest control has been the direct application of chemical products. However, in response to environmental, economic, and other problems associated with the over-reliance on chemical insecticides there has been an increasing drive towards the development of Integrated Pest Management (IPM) approaches. Many IPM strategies are now well developed under protected environments. However, within the open field in many situations targeted success is yet to be achieved. This special issue will seek to showcase original articles and reviews by leading research entomologists and associated experts. Articles presented will focus on the development and implementation of IPM strategies against various major arable and horticultural invertebrate pests (both indigenous and invasive species).

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