scholarly journals Gas monitoring station in hazardous environment with gases containing

2021 ◽  
Vol 894 (1) ◽  
pp. 012029
Author(s):  
S Sendari ◽  
Y Rahmawati ◽  
H Rahmawati ◽  
D Arengga ◽  
F M Ramadhan ◽  
...  
Keyword(s):  
Gas Composition ◽  
Solar Panels ◽  
Dynamic Changes ◽  
Monitoring Method ◽  
Voltage Level ◽  
Landfill Sites ◽  
Ambient Concentration ◽  
Landfill Emissions ◽  
Portable System

Abstract Landfill sites collect tons of municipal solid waste (MSW) using an open dump mechanism, causing gases to emerge, which may cause disease and the greenhouse effect. Mainly, landfill environments are observed using a portable system that does not continuously monitor and measure emitted gas levels. It is also difficult to evaluate changes in landfill emissions over the long term unless they are monitored at regular intervals according to a detailed plan. This paper presents a new monitoring method to measure gas levels in landfill sites, which documents dynamic changes in gas composition concentrations over the long term. The system was placed in the middle area of the landfill and was charged using solar panels for convenience and greater efficiency during monitoring. While the instruments that are currently available are used for a specific parameter, this system can measure eight parameters, i.e., ambient concentration of methane (CH4), carbon dioxide (CO2), carbon monoxide (CO), temperature, humidity, wind direction, wind speed, and voltage level. The system was evaluated regarding its ability to monitor gas parameters continuously.

scholarly journals Stabilizing the framework of SAPO-34 zeolite toward long-term methanol-to-olefins conversion

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Liu Yang ◽  
Chang Wang ◽  
Lina Zhang ◽  
Weili Dai ◽  
Yueying Chu ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Zeolite Catalyst ◽  
Catalytic Efficiency ◽  
Dynamic Changes ◽  
Structural Dynamic ◽  
Term Stability ◽  
Long Term Stability ◽  
Hydrocarbon Pool ◽  
Intrinsic Good

AbstractAs a commercial MTO catalyst, SAPO-34 zeolite exhibits excellent recyclability probably due to its intrinsic good hydrothermal stability. However, the structural dynamic changes of SAPO-34 catalyst induced by hydrocarbon pool (HP) species and the water formed during the MTO conversion as well as its long-term stability after continuous regenerations are rarely investigated and poorly understood. Herein, the dynamic changes of SAPO-34 framework during the MTO conversion were identified by 1D 27Al, 31P MAS NMR, and 2D 31P-27Al HETCOR NMR spectroscopy. The breakage of T-O-T bonds in SAPO-34 catalyst during long-term continuous regenerations in the MTO conversion could be efficiently suppressed by pre-coking. The combination of catalyst pre-coking and water co-feeding is established to be an efficient strategy to promote the catalytic efficiency and long-term stability of SAPO-34 catalysts in the commercial MTO processes, also sheds light on the development of other high stable zeolite catalyst in the commercial catalysis.

scholarly journals BrO/SO<sub>2</sub> molar ratios from scanning DOAS measurements in the NOVAC network

2013 ◽  
Vol 5 (2) ◽  
pp. 1845-1870 ◽  
Author(s):  
P. Lübcke ◽  
N. Bobrowski ◽  
S. Arellano ◽  
B. Galle ◽  
G. Garzón ◽  
...  
Keyword(s):  
Molar Ratio ◽  
Optical Absorption Spectroscopy ◽  
Short Term ◽  
Dynamic Changes ◽  
Volcanic System ◽  
Molar Ratios ◽  
Remote Sensing Technique ◽  
Field Campaigns ◽  
Term Field

Abstract. The molar ratio of BrO to SO2 is, like other halogen/sulphur ratios, a~possible precursor for dynamic changes in the shallow part of a volcanic system. While the predictive significance of the BrO/SO2 ratio has not been well constrained yet, it has the major advantage that this ratio can be readily measured using the remote-sensing technique Differential Optical Absorption Spectroscopy (DOAS) in the UV. While BrO/SO2 ratios have been measured during several short-term field campaigns this article presents an algorithm that can be used to obtain long-term time series of BrO/SO2 ratios from the scanning DOAS instruments of the Network for Observation of Volcanic and Atmospheric Change (NOVAC) or comparable networks. Parameters of the DOAS retrieval of both trace gases are given and the influence of co-adding spectra on the retrieval error will be investigated. Difficulties in the evaluation of spectroscopic data from monitoring instruments in volcanic environments and possible solutions are discussed. The new algorithm is demonstrated by evaluating data from the NOVAC scanning DOAS systems at Nevado del Ruiz, Colombia encompassing almost four years of measurements between November 2009 and end of June 2013. This dataset shows variations of the BrO/SO2 ratio several weeks prior to the eruption on 30 June 2012.

METHODOLOGY OF STRATEGIC MANAGEMENT IN THE AGRO-INDUSTRIAL COMPLEX

2021 ◽  
Vol 1 (5) ◽  
pp. 39-54
Author(s):  
А. M. NEKHLANOVA ◽  
Keyword(s):  
Strategic Management ◽  
Agricultural Production ◽  
Digital Technologies ◽  
Industrial Complex ◽  
Food Markets ◽  
Dynamic Changes ◽  
National Importance ◽  
Intensive Development ◽  
Global Food

The article presents the results of a study of the methodology of strategic management in the agro-industrial complex. In the context of dynamic changes in the external environment, the intensive development of global food markets, the accelerated introduction of digital technologies, biotechnologies, and genetic engineering, strategic management of the agro-industrial complex is an urgent scientific problem of national importance. The presented methodology takes into account the influence of the peculiarities of agricultural production on the formation of a strategic management system in the agro-industrial complex and allows the complex to function successfully in the long term.

scholarly journals TRUMP’S FOREIGN POLICY: PLANS AND REALITIES

2018 ◽  
pp. 73-82 ◽  
Author(s):  
E. V. Emelianov
Keyword(s):  
Foreign Trade ◽  
The United States ◽  
First Year ◽  
Solar Panels ◽  
White House ◽  
Trade Law ◽  
The Us ◽  
Second Year ◽  
Trade Partners

The article considers the changes in US foreign trade policy at the beginning of the Trump’s presidency. Exporting is a critical component for the long-term growth and the U.S. economy overall, and supporting millions of jobs in US. Though D. Trump campaigned for president as a protectionist, there was no such steps the first year of his presidency. But his second year in the White House began with announcing new tariffs on solar panels, washing machines, then on steel, aluminium. As concerning steel products, the United States being the world’s largest steel importer have persistent trade deficit.The US trade law allows the president to limit imports in case if domestic industries are threatened, against unfair foreign trade practices for a period of time, but such measures were not frequent in US practice. Meanwhile new protectionist measures are debated. Trump’s policy is being opposed not only by trade partners of the US, but in the US as well, by those who argue that protectionist measures will complicate international relationships.

scholarly journals Effect of long-term tending on qualitative and quantitative production in mixed stands of spruce, fir and beech on Motyky research plot

2012 ◽  
Vol 49 (No. 3) ◽  
pp. 108-124 ◽  
Author(s):  
I. Štefančík ◽  
L. Štefančík
Keyword(s):  
Stand Structure ◽  
Mixed Stands ◽  
Dynamic Changes ◽  
Tree Species Composition ◽  
Silvicultural Treatments ◽  
Altitudinal Zone ◽  
Control Dynamic ◽  
Crown Thinning ◽  
And Control

The paper is a&nbsp;contribution to research on thinnings in mixed (spruce-fir-beech) stands situated in the fifth forest altitudinal zone in the central part of Slovakia. Three plots were tended by free crown thinning while one plot was left without any planned silvicultural treatment (as a control). Dynamic changes in tree species composition, stand structure and quantitative production were evaluated for a period of 30 years. A&nbsp;special attention was paid to development of crop trees that are the main bearers of stand quality and quantity. The changes were compared with respect to differences between plots with long-term silvicultural treatments and control plot (without treatments). &nbsp; &nbsp;

Quality monitoring method for apples of different maturity under long-term cold storage

2021 ◽  
Vol 112 ◽  
pp. 103580
Author(s):  
Bo Zhang ◽  
Mengsheng Zhang ◽  
Maosheng Shen ◽  
Hao Li ◽  
Zhongxiong Zhang ◽  
...  
Keyword(s):  
Cold Storage ◽  
Quality Monitoring ◽  
Monitoring Method

scholarly journals Changes of Insulation Properties of Photovoltaic Cables Caused by Ageing Treatment

2020 ◽  
Vol 6 (1) ◽  
pp. 6-9 ◽  
Author(s):  
Juraj Packa ◽  
Vladimir Kujan ◽  
Daniel Štrkula ◽  
Vladimír Šály ◽  
Milan Perný
Keyword(s):  
Power Plants ◽  
Real Life ◽  
Life Time ◽  
Operating Conditions ◽  
Solar Panels ◽  
Font Size ◽  
Long Term Stability ◽  
Cable Systems

<span style="font-family: 'Times New Roman',serif; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-US">An important part of the photovoltaic power plants are cable systems. The dielectric properties of cables, reliability and durability depend on quality of production processes, operating conditions and degradation factors, as well. Expected lifetime of cable systems is more than 20-30 years in general. Their failure free operation and long-term stability of properties has a direct impact on the economic return of the investments. According to our experiences the tests in compliance with valid standards are not adequate to verify real life time during operation. Photovoltaic cables intended for use in outdoor applications for the connection between the solar panels and possible connection between panels and inverter were chosen for our experiments. <span style="-ms-layout-grid-mode: line;">The changes </span>of insulation resistance and breakdown voltage caused by some degradation factors, mainly water, are presented. This research was inspired by real failure in operation.</span>

scholarly journals Long-term dynamic changes in attached and planktonic microbial communities in a contaminated aquifer

2021 ◽  
Vol 277 ◽  
pp. 116765
Author(s):  
Juan F. Mujica-Alarcon ◽  
Steven F. Thornton ◽  
Stephen A. Rolfe
Keyword(s):  
Microbial Communities ◽  
Dynamic Changes ◽  
Contaminated Aquifer

Petroleum investors could cut their losses in Yemen

2017 ◽  
Keyword(s):  
Civil War ◽  
Oil And Gas ◽  
Oil Production ◽  
Liquefied Natural Gas ◽  
Solar Panels ◽  
Content Type ◽  
Remote Areas ◽  
Post Conflict ◽  
Oil And Gas Sector

Subject Yemeni oil production. Significance The oil and gas sector -- which was in any case in long-term decline, owing to a lack of investment -- suffered serious disruption after civil war broke out in March 2015, with oil, liquefied natural gas (LNG) and refining facilities closed, and ports blockaded to prevent delivery of oil products. The internationally recognised government of President Abd Rabbu Mansour Hadi has renewed efforts to encourage a recovery in oil production since late 2016, but these are hampered by the civil war and lawlessness in remote areas. Impacts Saudi Arabia and the UAE will be the main sources of oil imports, probably on concessional terms. Hydrocarbon exports will not provide sufficient finance for post-conflict reconstruction. Exports of LNG are unlikely to restart before 2020 at the earliest. A crisis of power provision will expand the market for small solar panels.

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