Noxious Gases Research Articles

Investigating the potential of carbon nitride as a new sensing material for NOx (N2O, N2O3, N2O4, and N2O5): a DFT study

Herein, DFT study was used to investigate the carbon nitride C6N8 as a potential detector of noxious gases, specifically nitrous oxide (N2O), dinitrogen tri-oxide (N2O3), dinitrogen tetra-oxide (N2O4), and dinitrogen penta-oxide. (N2O5). The Physiosorption process was notified after the adsorption of N2O (−12.6463 kJ mol–1), N2O3 (−40.1466 kJ mol–1), N2O4 (−23.8512 kJ mol–1), and N2O5 (−29.7947 kJ mol−1) on C6N8. The adsorption behavior shows weak interactions in the complexes which depicts the stability trend as N2O3@C6N8 > N2O5@C6N8 > N2O4@C6N8 > N2O@C6N8. Various analyses and techniques were employed to evaluate the sensing capability. Electronic parameters such as FMO, ELF, NBO, UV-visible spectrum, and DOS were performed to notify the detectable change in the sensing surface after the adsorption of the gases being studied. The existence of non-covalent interactions was confirmed by Symmetry Adopted Perturbation Theory (SAPT0), QTAIM, NCI, and IRI plots. Moreover, SAPT0 confirmed the greater contribution of Edispersion in N2O@C6N8. ESP (MEPs) visualization confirmed the interactions, as the nitrogen atoms of the surface are electron dense regions for the analytes to attack. Chemical stability and selectivity were evidenced by the stability parameters and the formation of new states in the DOS spectrum, respectively. Significant recovery time performance was observed after evaluating the recovery of analyte@C6N8 complexes at an appropriate temperature. These results suggest C6N8 theoretically as a potentially active sensing surface and it will enhance the interest of the experimental researchers in fabricating a sensing device using this material for the determination of even minute concentrations of the toxic gases.

Strategies for reducing noxious gas emissions in pig production: a comprehensive review on the role of feed additives.

The emission of noxious gases is a significant problem in pig production, as it can lead to poor production, welfare concerns, and environmental pollution. The noxious gases are the gasses emitted from the pig manure that contribute to air pollution. The increased concentration of various harmful gasses can pose health risks to both animals and humans. The major gases produced in the pig farm include methane, hydrogen sulfide, carbon dioxide, ammonia, sulfur dioxide and volatile fatty acids, which are mainly derived from the fermentation of undigested or poorly digested nutrients. Nowadays research has focused on more holistic approaches to obtain a healthy farm environment that helps animal production. The use of probiotics, prebiotics, dietary enzymes, and medicinal plants in animal diets has been explored as a means of reducing harmful gas emissions. This review paper focuses on the harmful gas emissions from pig farm, the mechanisms of gas production, and strategies for reducing these emissions. Additionally, various methods for reducing gas in pigs, including probiotic interventions; prebiotic interventions, dietary enzymes supplementation, and use of medicinal plants and organic acids are discussed. Overall, this paper provides a comprehensive review of the current state of knowledge on reducing noxious gas in pigs and offers valuable insights for pig producers, nutritionists, and researchers working in this area.

Electrification of Loaders and Trucks – A Step Towards More Sustainable Underground Mining

Metal mining at great depths is associated with a high demand for fresh air required to cool down mine openings, evacuate noxious gases and contaminants, as well as to provide sufficient amounts of oxygen for miners. Diesel powered load haul-dump (LHD) machines, trucks and other mobile equipment used extensively by modern mines not only emit exhaust gases and diesel particulate matters (DPM), but constitute also an additional source of heat. As mine regulations get steadily more stringent with regard to air quality, the use of diesel engines has an increasingly adverse impact on ventilation costs. In this context, this paper examines electric drives (mainly those commercially available) as possible alternatives for diesel power trains. They are reviewed with regards to their principles, required infrastructure, as well as technical and operational issues. Their practicality and economic viability are also addressed. Moreover, their benefits and potential for implementation in the conditions of deep metal mines are discussed. The paper concludes with a resume of current and short-term potential of electric loading and haulage equipment as alternative to diesel-powered vehicles in deep metal mines. It underlines the growing interest in their application as means to improve sustainability of underground mining.

Sensing applications of graphitic carbon nitride (g-C3N4) for sensing SO2 and SO3 – A DFT study

Gas sensors are instruments that detects and monitors the presence of harmful and toxic gases in the atmosphere. They are an essential tool for maintaining environmental health, air quality, and safety, and their invention has prompted an extensive research and advancement in the field of gas detection. The sensing and adsorption behaviour of graphitic carbon nitride are analyzed to detect noxious gases SO2 and SO3 using density functional theory. Upon absorption of SO2 and SO3 analytes on the surface of the carbon nitride (C6N8), moderate physiorption for the SO2 analyte (−37.11 kJ mol−1), and high chemisorption for SO3 analyte (−67.90 kJ mol−1) are observed. The interaction energies depict weak van der Waals forces that is further demonstrated by the noncovalent interaction index (NCI), symmetry perturbation theory (SAPT0) and quantum theory of atoms in molecules (QTAIM) analysis. Using the natural bond orbital analysis, UV–Vis analysis, electron localization function, molecular electrostatic potential, and density of state (DOS) analysis, the electronic properties of complexes were analyzed to determine the significant impacts of the adsorption of these analytes (SO2 and SO3) on the carbon nitride C6N8. Natural bond orbital analysis revealed that charge migration occurs from the carbon nitride C6N8 surface towards the analytes (SO2 and SO3) during complex formation that are −0.032 and −0.189 e−, for SO2@C6N8 and SO3@C6N8 complexes. The analytes (SO2 and SO3) behave as electrophiles and the carbon nitride C6N8 surface serves as a nucleophilic attack in both complexes. The chemical reactivity of both complexes was shown by the development of new excited states in the PDOS spectrum. At 300 K, the recovery period was calculated by applying the transition state theory to analyze the reusability of the carbon nitride C6N8 surface. Our finding provides a theoretical foundation for the possible use of carbon nitride C6N8 surface for gas sensors targeting significant air pollutants such as SO2 and SO3 in the environment.

Aspects regarding the impact of cloth waste burning in the historical residential areas of the Petroșani municipality

The restructuring of the mining sector in the Jiu Valley basin in the context of decarbonization has as its main goal the reduction of atmospheric pollution. Despite the fact that previous studies suggest an overall improvement in air quality as a result of this process, most ignore the lack of an immediate alternative to the use of coal as a primary energy resource both locally and regionally. This lack of alternatives has been found to have a negative influence on air quality through the noxious gases and Particulate Matter released into the atmosphere following the burning of some fuels, cloth and footwear waste, especially in the historical residential areas of the cities. In this paper, some of the results obtained from the instrumental determinations carried out in different areas of the Petroșani Municipality are presented, with special regard to the air quality in the Historical Center of this city.

Lactulose with synergists supplementation improving a health of chicks and reducing the environmental burden in poultry industry.

The study aims to understand the effect of new antibiotic-substituting supplements in feeding chickens of the Hisex Brown cross in industrial conditions. A total of 216 hatched chicks were randomly selected and distributed into Control, Test I, and Test II groups, with 3 replicates of 24 birds in three treatments. At the end of the experiment, BW of T1/T2 birds was higher by 6.12% (p <0.01) and 10.29% (p <0.001) than CON. In comparison with the control hens, T1/T2 birds had a higher feed conversion rate and digestibility of nutrients. The blood indicators of T1/T2 hens exceeded those in control. Prebiotic supplementations were positively influenced in the immune indices of birds. IgA, IgG, IgM increased in groups T1/T2. Similar regularity was found in the natural resistance of chicks fed S1/S2. In the caecum, the Lactobacilli number was higher than in CON by 17.03% (p <0.01) in T1 and by 18.47% (p <0.01)-in T2; Bifidobacteria-by 17.94 (p <0.001) and 19.09% (p <0.01), respectively; at the same time, the number of E. coli decreased by 21.05% (p <0.01) and 24.21% (p <0.01). The concentration of emitted excreta noxious gases decreased: ammonia by 22.40%-24.95% (p <0.01); hydrogen sulfide by 10.67%-16.00% (p <0.01); and mercaptans by 12.90%-17.74% (p <0.05). These findings support the use of lactulose-based supplements as antibiotic alternatives to improve production in poultry farming and to reduce the toxic load on the environment.

Prevalence of coronary artery disease in chronic obstructive pulmonary disease patients- a retrospective observational study

Background: Chronic obstructive pulmonary disease (COPD) is characterized by chronic inflammation that results in progressive and irreversible air flow obstruction usually caused by an inflammatory response of the lungs to noxious particles and gases. There are periods of acute episodes of worsening and exacerbation. COPD was predicted to be the third leading cause of death worldwide by 2020, is a major cause of disability adjusted life years (DALY). Patients with COPD are often complicated by coronary artery disease (CAD), both of which are public health problems. There are probably a lot of mechanisms involved in the co-existence of these comorbidities like ageing, sedentary life style, systemic inflammation, atherosis and arterial stiffness. The confirmation of this comorbidity in COPD is very important as it can have implications in the management of the disease. Methods: This observational study was done in a tertiary care hospital in Central Kerala. It was a retrospective observational study. 100 patients were included in the study. Results: Out of 100 COPD patients that were included in the study, 27% of them had CAD as a comorbidity which implies that all patients with COPD should be screened for CAD as well. Conclusions: All COPD patients should be screened for a coexisting CAD.

Off-Gassing and Oxygen Depletion in Headspaces of Solid Biofuels Produced from Forest Residue Biomass

As living standards improve worldwide, the demand for energy increases. However, climate changes and decreasing fossil fuel deposits have increased interest in renewable energy sources, including pellets produced from forest residues. This study aimed to compare changes in concentration of gases (CO, CO2, O2, volatile organic compounds—VOCs) in enclosed headspaces above pellets produced from deciduous (oak OA, birch BI) and coniferous (pine PI, spruce SP) dendromass and selected types of commercial pellets during their storage. The experiment measured the concentration of gas released from the pellets in storage daily for 14 days. The highest mean CO concentration was found for PI pellets (1194 ppm), and the lowest was for OA (63.3 ppm). Likewise, the highest CO2 concentration was noted for PI pellets (4650 ppm), and the lowest was for BI (1279 ppm). The largest VOC amount was released in the headspace above PI (88.8 ppm), and the smallest was above BI (4.6 ppm). The oxygen concentration was the lowest as measured for PI (minimum 16.1% v/v) and for SP (19.3% v/v). The threshold limit value (8 h) for CO was exceeded for all the pellets under analysis and, in the case of CO2, only for PI after day 10 of incubation. The study findings are extremely important from a scientific (but mainly from a practical) perspective because of the safety of storing and transporting wood pellets. The knowledge of autooxidation processes in those biofuels can help organize their logistics and storage and result in proper warehouse ventilation and monitoring of noxious gases.

Carbon capture from biomass flue gases for CO2 enrichment in greenhouses

Heating and CO2 enrichment systems can improve yields in intensive greenhouse agriculture Combining both techniques, which are currently applied commercially, can potentially enhance their effect. The CO2 must be separated from the other noxious gases present (such as CO, NOX, and SO2) to avoid them becoming part of the supply. The CO2 is then provided to the greenhouse on demand in the same way as the heating. In this work, we show that an improved food productivity of a pilot-scale greenhouse system combined with CO2 capture by adsorption using activated carbon and heating with alternative fuel. The proposed system's overall performance was evaluated and optimized. The best values were 46.7 g/kg of CO2 storage capacity on the adsorbent bed, 99.99 % removal rate harmful gases from the gas supplied to the greenhouse, CO2 levels of 1851.0 ± 262.8 mg/Nm3 of the CO2 levels in the greenhouse, and an enrichment time of 2.18 ± 0.92 h/day. The system's effective performance over extended periods (November–February) was confirmed and the productivity of a crop species (tomato) was compared to a control, showing an increment of 18 %. The results indicate that this is a valuable option for increasing the crop yield. By integrating this combined system with advanced climate control strategies, it is possible to maximize the CO2 provided per day, leading to higher yields. The system proved to be stable under real pilot-scale conditions over winter periods (four months).

Enhanced CO sensing with highly sensitive and selective rGO-Ru OEP chemiresistive sensor

The escalating discharge of noxious gases resulting from unmitigated anthropogenic activities has emerged as a pivotal concern, presenting imminent threats to global ecosystems. In response to this pressing challenge, the development of cutting-edge materials within gas sensor systems emerges as a promising avenue for the precise detection of hazardous gaseous pollutants. This investigation delves into the synthesis and characterization of a novel composite material: reduced graphene oxide (rGO) modified with ruthenium Octaethyl porphyrin (Ru OEP), with a primary focus on its chemiresistive sensing properties. The meticulously deposited rGO-modified Ru OEP material onto gold microelectrodes, featuring a 3 µm gap on a silicon Si/SiO2 substrate, resulted in an intricate two-terminal chemiresistive sensor device. Comprehensive structural, spectroscopic, and morphological analyses were conducted to elucidate the intricacies of the composite material. The electrical characterization, evaluated through I-V measurements, provided nuanced insights into the device's resistance properties. Notably, the chemiresistive sensor demonstrated exceptional responsiveness to Carbon monoxide (CO) gas, exhibiting an impressively low limit of detection (LOD) at 2.5 ppm. The fabricated sensor showcased rapid response and recovery times, registering at 43 s and 65 s, respectively, underscoring its efficiency in real-time applications. Furthermore, the sensor maintained linearity and stability across a broad spectrum of conditions, ensuring prolonged reliability and consistent performance. This research underscores the potential of advanced materials, specifically the rGO-modified Ru OEP composite, in crafting highly effective gas sensors to address urgent environmental and safety concerns. The presented findings contribute invaluable insights to the burgeoning field of gas sensor technology, paving the way for innovative solutions to mitigate the adverse impacts of anthropogenic activities on our delicate ecosystems.

IOT-based solution for detection of air quality using ESP32

Air pollution, a growing public health crisis worldwide, has become one of the most imperative concerns challenging human health, the environment, and the economy. The detrimental effects of air pollution on individuals' well-being and the ecological system necessitate implementing advanced solutions to accurately monitor and manage air quality. In response to this global challenge, a comprehensive, real-time IoT-based air quality monitoring system is proposed using ESP32 and multiple pollutant sensors. This versatile system endeavors to measure and report various air quality parameters and pollutants, such as temperature, humidity, carbon dioxide (CO2), particulate matter (PM2.5 and PM10), volatile organic compounds (VOCs), and other noxious gases, including nitrogen dioxide (NO2), ozone (O3), and sulfur dioxide (SO2). The innovative solution showcased in this proposal combines the functionalities of an ESP32 microcontroller, a highly integrated and low-power device, with diverse pollutant sensors chosen for their high sensitivity and ability to offer precise and reliable readings. The various sensors integrated into the system include the MQ135, CCS811, PMS5003, and BME280, each responsible for detecting specific pollutants and air quality parameters. As a leading component of the air quality monitoring system, the ESP32 microcontroller warrants seamless wireless data transmission to cloud servers for real-time monitoring, allowing for remote access and analysis of the air quality data through secure networks. The modular design and ease of deployment of the IoT-based air quality monitoring systems make them installable in various scenarios, including residential, commercial, and industrial settings. Users can make informed decisions about their environment by analyzing extensive real-time data, promoting timely exposure warnings, proactive pollution management, and environmental sustainability. This portability and versatility of deployment ensure substantial coverage of areas that would benefit from real-time air quality monitoring. The air quality monitoring system is further enhanced by incorporating a user-friendly mobile application or web interface, empowering users to access real-time sensor data directly, configure threshold-based alerts and notifications, and visualize trends in air quality parameters over time. This hands-on approach to accessing real-time air quality data encourages individuals to adopt environmentally conscious habits and fosters a better understanding of the impact of pollution on their health and surroundings. To ensure the optimum performance and efficacy of the air quality monitoring system, regular maintenance and calibration services are advocated. By undertaking timely sensor calibration, replacing worn-out components, and updating software when required, the life span, accuracy, and reliability of the system are enhanced, promising continued effectiveness in the real-time monitoring and management of air quality

Optimisation of rock mass quality parameters for the initial geotechnical investigation of a vertical shaft: Gosowong Gold Mine Project Case Study - North Halmahera

This article presents a case study that highlights the importance of a thorough geotechnical assessment at an early stage of project development. Shaft ventilation is one of the critical elements in underground mines, providing oxygen and ensuring air quality for breathing, removing noxious gases from equipment and explosions, reducing the natural temperature of the rock, and more, so stability analysis is required for design and strategy prior to shaft opening. Through extensive field surveys, drilling and laboratory testing, the project team has gathered data to assess rock quality parameters, including rock strength, geological structure and hydrogeological characteristics. The McCracken and Stacey (MS) method is one such empirical approach to assist shaft development risk assessment. The results of this analysis allowed the identification of potentially unstable zones. It was concluded that 45% of the planned ventilation shafts have stability problems due to rock mass variations. The risk value of the shaft development plan was obtained with a high failure risk of 25%, a medium failure risk of 33% and a low failure risk of 42% based on the raise bore quality index (QR).

Study of comorbidities in chronic obstructive pulmonary disease patients at tertiary health care centre in south Gujarat just in the era of Covid-19 pandemic − a cross-sectional study

Background: Chronic obstructive pulmonary disease (COPD) can coexist with other diseases that may significantly impact the disease course. In this study, our aim is to study the prevalence of various extrapulmonary comorbid conditions associated with COPD. Method: This is a cross-sectional study, including all COPD patients presenting to Outpatient Department (OPD) and Inpatient Department (IPD) of Respiratory Medicine Department after meeting the inclusion and exclusion criteria. A COPD patient was defined as a smoker or having exposure to noxious gases, with forced expiratory volume in 1 s (FEV1)/forced vital capacity (FVC) &lt;0.7 and comorbidities were defined based on objective laboratory findings and questionnaires. Comorbidities were identified from patient self-reports and disease-specific lab analysis and medication. Results: Among the 200 patients of COPD, hypertension was found to be the most common comorbidity with a prevalence of 44% followed by diabetes mellitus with a prevalence of 28% and then dyslipidaemia 26.5%. The prevalence of ischemic heart disease (8.5%), depression (16.5%), anemia (16%), osteoarthritis (13%), and chronic kidney disease (9.5%) were other comorbidities among the patients. Smoking is the major culprit with an 80.5% prevalence among the patients. Conclusions: Hypertension was the most common comorbidity in our study population. An increasing number of people in any aging population will suffer from multi-morbidity, defined as the presence of two or more chronic conditions, and COPD is present in the majority of multi-morbid patients. Whether or not COPD and comorbid diseases are related, management of the COPD patient must include the identification and treatment of its comorbidities.

FAM13A regulates cellular senescence marker p21 and mitochondrial reactive oxygen species production in airway epithelial cells.

Inhalation of noxious gasses induces oxidative stress in airway epithelial cells (AECs), which may lead to cellular senescence and contribute to the development of Chronic Obstructive Pulmonary Disease (COPD). FAM13A, a well-known COPD susceptibility gene, is highly expressed in airway epithelium. We studied whether its expression is associated with aging and cellular senescence and affects airway epithelial responses to paraquat, a cellular senescence inducer. The association between age and FAM13A expression was investigated in two datasets of human lung tissue and bronchial brushings from current/ex-smokers with/without COPD. Protein levels of FAM13A and cellular senescence marker p21 were investigated using immunohistochemistry in lung tissue from COPD patients. In vitro, FAM13A and P21 expression was assessed using qPCR in air-liquid-interface (ALI)-differentiated AECs in absence/presence of paraquat. Additionally, FAM13A was overexpressed in human bronchial epithelial 16HBE cells and the effect on P21 expression (qPCR) and mitochondrial ROS production (MitoSOX staining) was assessed. Lower FAM13A expression was significantly associated with increasing age in lung tissue and bronchial epithelium. In airway epithelium of COPD patients, we found a negative correlation between FAM13A and p21 protein levels. In ALI-differentiated AECs, the paraquat-induced decrease in FAM13A expression was accompanied by increased P21 expression. In 16HBE cells, the overexpression of FAM13A significantly reduced paraquat-induced P21 expression and mitochondrial ROS production. Our data suggest that FAM13A expression decreases with aging, resulting in higher P21 expression and mitochondrial ROS production in the airway epithelium, thus facilitating cellular senescence and as such potentially contributing to accelerated lung aging in COPD.

Increased neutrophil-lymphocyte ratio in patients with COPD: case-control study

Chronic obstructive pulmonary disease (COPD) is one of the major causes of chronic morbidity and mortality and one of the major public health problems worldwide that affects millions of people all over the world. It is characterized by persistent airflow obstruction associated with enhanced inflammation in the airways and the lungs in response to noxious particles or gases. The main objective of this study is to investigate the neutrophil-lymphocyte ratio in patients with COPD as a case-control study. Between November 01, 2022, and February 28, 2023, patients were admitted to Al Hussain Teaching Hospital in Al Muthanna Governorate, Department of Medicine. The study included 51 patients with an approved diagnosis of COPD the mean age was 51.5 years, and 51 patients as control with other diseases mean age was 51.3 years). The subjects in all groups were 32 male and 19 female. Complete blood count (CBC) was measured from blood samples taken from patients. In the present study 51 COPD cases and 51 controls. No significant difference was observed between COPD cases and controls regarding age (p = 0.092); the average age of COPD cases was 51.5 years. No significant differences were observed between COPD cases and controls regarding gender (p = 0.085). At baseline, 21.0%, 40.3%, 25.7%, and 13% were diagnosed as COPD grade 1, 2, 3, and 4, respectively based on the (GOLD) classification. Baseline NLR significantly increased with the severity of COPD grade (1.3 vs. 2.7 vs. 2.2 vs. 2.9), p = 0.002). The cutoff for neutrophil-to-lymphocyte ratio, CRP, WBC, and ESR were 3.28, 2.32, 1.22, and 4.21 respectively. It has 85% sensitivity for detection of COPD exacerbation. and 89% specificity (AUC 0.798, p = 0.001). In conclusion, Blood NLR is a simple, inexpensive, widely available index that has been intensively evaluated in recent years in several clinical applications and in various diseases, including COPD.

Synthesis of NiO/TiO₂ Binary Nano Composite for the Enhancement of Gas Sensing Properties

The rapid development of electronic devices used in detecting noxious gases has made gas sensors more and more important. The semiconducting metal oxides’ ability to detect gases is a result of their reactions with the gases in the environment, which change the semiconductor’s resistance. In this study, a composite metal oxide material made of NiO and TiO2 with different doping concentrations of (1, 3, 5, 7) is synthesized using the sol-gel process. A binary compound with excellent crystallization is obtained post 500° calcination. SEM, XRD and FTIR were used to evaluate the morphological fluctuations and the phase identification of NiO/TiO2 nano composite. The butane gas is found to respond well in the concentration ranges of 500 to 3000 ppm, respectively, at temperatures 373 to 573 K as well as at ambient temperature.

Pt atomic catalyst on MXene (Ti3C2O2) sheet: A superior candidate for enhanced adsorption and gas sensing of NH3, H2S and CO2

In intelligent agriculture, the development of gas sensing technology has practical significance. In a bid to achieve fast, accurate and effective detection of noxious gases NH3, H2S and CO2 from breeding farms, Ti3C2O2, an excellent gas sensing material in the MXene family, was investigated by means of density functional theory (DFT) calculations. The optimal configuration of Pt atomic catalyst doped Ti3C2O2 sheet was obtained via the analysis of binding energy (−1.796 eV) and charge transfer (0.373 e). The adsorption energy, charge transfer, deformation charge density (DCD), density of states (DOS), average electrostatic potential, and work function of NH3, H2S and CO2 adsorbed on Ti3C2O2 and Pt-Ti3C2O2 sheet were further scrutinized. From comparative analysis against Ti3C2O2, Pt-Ti3C2O2 possesses excellent adsorption capacity, electron density rearrangement and electrostatic binding ability for the adsorption of NH3, H2S and CO2, among which the adsorption energy for NH3 is the largest (−2.593 eV). The results verify that Pt-Ti3C2O2 is a potential material for gas sensors, providing guidance for expanding the gas sensing application of MXene materials.

Assessing energy efficiency and regulatory complexity in steam-powered LNG carriers

The urgency surrounding climate change has spurred the development of renewable energies and a shift towards lower carbon fuels. Liquified Natural Gas (LNG) emerged as a favored choice for industries and countries for reducing atmospheric emissions, with a projected 40% increase in LNG demand over the next two decades. Shipping has become a vital transportation mode for LNG. Alongside its growing share in the global energy mix, LNG is also viewed as a cleaner alternative to conventional fuel oils, offering significant reductions in noxious gases like NOx, SOx, and CO2 emissions.Despite being less favored in the construction of new LNG carriers (LNGC), steam-powered LNGC account for 39% of the current LNGC fleet as of January 2023. This paper evaluates the operational performance of turbine-powered LNG vessels using high-frequency data. It aims to provide a clear understanding of the energy efficiency of these vessels and their compliance with environmental regulations.

Value of Adding Nebulized Magnesium Sulphate to Rescue Medications in Acute Exacerbation of Chronic Obstructive Pulmonary Disease in Patients Admitted to Emergency Room

Abstract Introduction Chronic Obstructive Pulmonary Disease (COPD) is a common, preventable and treatable disease that is characterized by persistent respiratory symptoms and airflow limitation that is due to airway and/or alveolar abnormalities usually caused by significant exposure to noxious particles or gases, Nebulized magnesium is attractive as a therapeutic option because it is easily administered, relatively cheap and has minimal side effects. In light of some evidence for an effect when nebulized in severe exacerbations of asthma, the similarities between asthma and chronic obstructive pulmonary disease (COPD) (especially with regard to bronchodilator therapy) and the practical advantages of administration via nebuliser, we sought to focus on the nebulized route of delivery in acute exacerbations of chronic obstructive pulmonary disease (AECOPD). Objective The aim of this work was to evaluate the effect of administration of nebulized magnesium sulphate in the management of acute exacerbations of chronic obstructive pulmonary disease. Patient and methods The study was conducted upon 100 patients with acute exacerbation of COPD randomly divided into two groups, 50 patients for each group who admitted to emergency room with acute exacerbation of Chronic Obstructive Pulmonary Disease in Mansoura chest diseases hospital From January 2019 to June 2019, All patients randomly divided into two groups, Patients of group A: included 50 patients received 2.5 mg salbutamol (2.5 ml), mixed with 500 mg isotonic magnesium sulphate(5 ml), Patients of group B: included 50 patients received 2.5 mg salbutamol mixed with 2.5 ml isotonic saline. Treatment for all patients were given via nebulizer. Results There were no significant differences between group I who received nebulized magnesium sulphate + salbutamol and group II who received nebulized salbutamol regarding pulmonary functions (FEV1, FVC and FEV1/FVC), before and after treatment. After treatment there is a significant increase in O2 saturation, PO2 and Serum Mg(more in group I who received nebulized magnesium sulphate + salbutamol than group II who received nebulized salbutamol) and no significant difference between the two groups as regard PH, PCO2, HCO3, and CRP. There is significant change in pulmonary functions ( FEV1, FVC and FEV1/FVC), PO2, and O2 Saturation after treatment and no significant change in PH, PCO2, HCO3, serum Mg and CRP, in patients received salbutamol nebulizer. There is significant change in pulmonary functions ( FEV1, FVC and FEV1/FVC), PO2, O2 Saturation and serum Mg after treatment and no significant change in PH, PCO2, HCO3, and CRP in patients received Magnesium sulphate + salbutamol nebulizer. Conclusion Adding nebulized magnesium sulphate as an adjuvant to salbutamol treatment in the setting of AECOPD has no effect on FEV1, FVC&amp;FEV1/FVC. Nebulized magnesium sulphate+ salbutamol provides nearly equal response to nebulized salbutamol in the treatment of Acute Exacerbation of Chronic Obstructive Pulmonary Disease in adults. So we do not recommend routine using of nebulizeld magnesium sulphate as an adjuvant to salbutamol treatment in the setting of AECOPD.

Phosphate Additives for Aging Inhibition of Impregnated Activated Carbon against Hazardous Gases.

Impregnated activated carbons (IACs) used in air filtration gradually lose their efficacy for the chemisorption of noxious gases when exposed to humidity due to impregnated metal deactivation. In order to stabilize IACs against aging, and to prolong the filters' shelf life, inorganic phosphate compounds (phosphoric acid and its three salts, NaHPO4, Na2HPO4, and Na3PO4) were used as anti-aging additives for two different chromium-free IACs impregnated with copper, zinc, molybdenum, and triethylenediamine (TEDA). Phosphoric acid, monosodium, and disodium phosphate were found to be very efficient in inhibiting the aging of IACs over long periods against cyanogen chloride (the test agent) chemisorption, with the latter being the most efficient. However, the efficiency of phosphate as an anti-aging additive was not well correlated with its ability to inhibit the migration of metal impregnants, especially copper, from the interior to the external surface of carbon granules. Unlike organic additives, the inorganic phosphate additives did not decrease the surface area of the IAC or its physical adsorption capacity for toluene. Using a phosphate additive in IAC used in collective protection and personal filters can improve the safety of the user and the environment and dramatically reduce the need to replace these filters after exposure to humid environments. This has safety, economic, logistical, and environmental advantages.