Gas Values Research Articles

Carbon sequestration with enhanced gas recovery (CSEGR) for a novel natural gas value chain: Synergy with cold energy utilization

Liquefied natural gas (LNG) plays a primary role in long-distance transportation; however, its production is energy-intensive, and CO2 emissions from its use are unavoidable. To address these challenges, a liquid CO2-mixed refrigerant (LCO2MR) process is proposed, utilizing CO2 in two distinct ways: (i) recovering cold energy from LNG regasification for use in the natural gas liquefaction process and (ii) injecting CO2 into gas fields for enhanced gas recovery (EGR), boosting natural gas production. This study comprehensively analyzes the proposed process, focusing on thermodynamic, economic, and environmental impacts. The energy consumptions for the propane precooled mixed refrigerant (C3MR) and LCO2MR processes are 970 and 815 kJ/kg of LNG, respectively. The LCO2MR process has an annual expense 18.94 % lower than C3MR process when considering carbon tax, due to its simpler structure and lower energy requirements. Environmentally, the LCO2MR process reduces CO2 emissions by 53.33 % across the value chain compared to the C3MR process. Additionally, using CO2 for EGR is projected to increase natural gas production by 81.67 tons/h. These results indicate that utilizing CO2 as a cold energy carrier and for increasing natural gas production is energetically and economically advantageous, significantly reducing CO2 emissions and contributing to a cleaner LNG value chain.

INNOVATIVE SOLUTIONS FOR IMPROVING THE EXISTING HEAT EXCHANGE EQUIPMENT OF METALLURGICAL ENTERPRISES

Considered issues regarding the refusal to use natural gas in the technological process of air heating in air heaters ofblast furnaces (coopers) of metallurgical enterprises. An innovative solution is proposed – a technological schemeusing a heat generator for heating flue gases and improving the system of their heat utilization in order to increase thetemperature of air and gas entering the air heater by 150–200°C. The results of the test trials of the technologicalscheme, which were carried out under the following conditions, are presented: calorific value of the mixture of naturaland blast furnace gas – 826.4 kcal/m3 (3,459.3104 KJ); calorific value of blast furnace gas – 750.7 kcal/m3 (3,142.43KJ); air consumption per unit of air heaters – 58 thousand m3/h; temperature of combustion components in front ofheat exchangers: air – 10 °С; fuel – 35 °C; smoke temperature: at the exit from the air heaters – 230 °C; in front of thechimney – 130 °C. The results showed that its application will ensure an increase in the average temperature of blastheating by 60-110°С without the use of natural gas, the duration of operation of heat exchangers can be increased byat least 10 years, and the technical and economic indicators of the blast furnace process will also improve. Theproposed innovative solutions will allow: to abandon the use of natural gas for air heaters; ensure coke savings up to14 kg/t; increase the average heating temperature of blowing by 110°C; stable, long-term provision of the necessaryair heating temperatures. The use of these technical solutions will allow to increase the production of cast iron andreduce the consumption of natural gas to increase the temperature of hot blasting. In the future, similar schemes maybe used in the fuel preparation system for multi-fuel boiler units of metallurgical enterprises

Physiologic Outcomes after Thiafentanil and Xylazine Immobilization in Free-Ranging Moose (Alces alces).

Effects on physiology were evaluated in 49 free-ranging moose (Alces alces), 11 adult males, 36 females, two of unknown sex) in Minnesota, USA, immobilized by helicopter darting with thiafentanil (10 mg) and xylazine (30 mg) in February 2020 and March 2021. Pursuit time (PT), induction time (IT), recumbency time (RT), recovery time (RC), temperature (T), and body position were recorded. For 14 females, respiratory rate (RR), pulse rate (PR), and pulse oximetry (SpO2) were obtained before and at 1, 5, and 10 min after 4 L/min nasal oxygen supplementation was started; pH, lactate (Lac), arterial oxygen (PaO2), and carbon dioxide (PaCO2) tensions were obtained pre-treatment and 5 min post-treatment. Immobilizations were reversed with naltrexone (200 mg) and tolazoline (800 mg) intramuscularly. Median PT and IT were 4 min; a longer dart needle significantly reduced IT (P=0.0274). Most (98%) remained sternal; 77% held their head upright. Median RC was 3 min. Temperature remained ≤41.2 C. Median RR, PR, and SpO2 were RR=20 breaths/min, PR=70 beats/min, SpO2=91% pre-treatment and RR=30 breaths/min, PR=72 beats/min, SpO2=97% 5-min post-treatment. Median blood gas values were pH=7.45, Lac=5.62 mmol/L, PaCO2=44 mmHg, and PaO2=65 mmHg pre-treatment and pH=7.48, Lac=4.99 mmol/L, PaCO2=41.1 mmHg, and PaO2=78 mmHg 5 min post-treatment. Physiologic improvement from oxygen supplementation was clinically relevant but not statistically significant. All moose survived immobilization. Thiafentanil and xylazine combination provided safe and effective immobilization in free-ranging moose.

Pyrolysis and oxidation characteristics and energy self-sustaining process design of retired wind turbine blades

Pyrolysis offers a straightforward method to extract valuable glass fiber from retired wind turbine blades, showing great potential for resource utilization. Experimental findings reveal that calorific value of pyrolysis gas increases with pyrolysis temperatures between 400 and 700 ℃. When the solid product obtained was oxidized at 500 ℃ for 40 minutes, clean glass fiber products can be obtained. Based on it, a new pyrolysis process for retired wind turbine blades and clean glass fiber recovery was designed using Aspen Plus software. By comparing the influence of pyrolysis temperatures, the stability and flexibility of the system were analyzed. The simulation results indicate that the pyrolysis temperature within the range of 400–700 ℃ can fully achieve energy self-sufficiency of the system, and excess heat can be stored by heating molten salts with high heat capacity. In practical applications, it is recommended to set the pyrolysis temperature and oxidation temperature at approximately 500 ℃, thereby further improving the economic efficiency of the system. This pyrolysis and recovery process can significantly improve its economic efficiency through energy self-sustaining system optimization, marking a significant contribution to the sustainable and economic management of retired wind turbine blade resources.

Electrical and work function-based chemical gas sensors utilizing NC3 and graphene combination

Research has been conducted on the potential practical uses of heterostructures made of graphene and carbon nitride (NC3) following their successful synthesis. The remarkable gas sensing properties of these 2D nanosheets have captured significant interest, attributed to distinctive electronic characteristics and exceptional surface-to-volume ratio that are resulted from combination of NC3 and graphene. In this study, we present a detailed analysis of electronic and structural features of pristine NC3 and graphene (PG), and their in-plane heterostructures using first-principles density functional theory. Our investigation utilizes the B3LYP and dispersion-corrected van der Waals (vdW) functional WB97XD, along with 6-311G (d, p) basis set. Our findings indicate that the nanosheets we anticipated exhibit robust structural stability, characterized by a desirable cohesive energy. Furthermore, we observed a gradual increase in the bandgap as the concentration of N–C in the nanosheets increases. Additionally, we investigated the adsorption characteristics of these heterostructures towards toxic gas molecules such as SO2 and CO. Among the studied heterostructures, GNC3I demonstrated higher adsorption energy (Eads), with values of approximately −0.283 and −0.491 eV when exposed to SO2 and carbon monoxide gas molecules respectively. Electronic characteristics, including LUMO and HOMO energy values, energy gap (Eg) between HOMO and LUMO, work function, Fermi level, and conductivity, underwent notable modifications upon SO2 gas adsorption over nanosheets, except for PG. However, these parameters remained relatively unchanged following carbon monoxide adsorption. Natural bond orbital (NBO) and Mulliken charge analysis demonstrates that there is a transfer of charge from gas molecules to nanosheets. Although nanosheets exhibit slightly higher adsorption energy (Eads) values for CO gas compared to SO2 gas, various assessments, including molecular electrostatic potential (MEP) mapping, electronic properties, and charge transfer (CT) analysis, suggest that these nanosheets are superior sensors for detecting SO2 gas rather than carbon monoxide gas molecules.

The Relationship between the Improvement Level in Blood Gas Parameters in Time and Brain MRI Findings in Newborns with the Diagnosis of Hypoxic Ischemic Encephalopathy.

In this study, we aimed to evaluate the relationship between the level of improvement in blood gas parameters in the first hours of age and normal and diffusion-restriction brain magnetic resonance imaging (MRI). The study is a retrospective cohort study. Cases of the diagnosis of hypoxic-ischemic encephalopathy (HIE) who received therapeutic hypothermia in our unit between January 2022 and January 2024 were included in the study. Clinical findings, blood gas values (first, cord; second, first hours of age; third, 24th hour of age), and MRI results were recorded from the case files and compared between normal and diffusion-restricted brain MRI groups. Diffusion-restricted brain MRI was detected in 10 out of a total of 19 cases. The 5-minute Apgar score was lower (p=0.038) and mechanical ventilator support was higher (P=.003) in the diffusion-restricted MRI group than in the normal MRI group. The relationship was shown between high base excess (P=.022) in cord blood gas, low HCO₃ (p=0.025) in the 24th hour blood gas, and convulsion (P=.033) in the diffusion-restricted MRI group. Additionally, it was found that only the improvement level of the pH value in the first hour of age was significant (P=.025) in the diffusion-restricted brain MRI group than in the normal MRI group. We showed that there was a relationship between diffusion-restricted brain MRI and the improvement level in the pH value in the first hours of age of patients diagnosed with HIE who received treatment for therapeutic hypothermia.

Machine learning for forecasting initial seizure onset in neonatal hypoxic-ischemic encephalopathy.

This study was undertaken to develop a machine learning (ML) model to forecast initial seizure onset in neonatal hypoxic-ischemic encephalopathy (HIE) utilizing clinical and quantitative electroencephalogram (QEEG) features. We developed a gradient boosting ML model (Neo-GB) that utilizes clinical features and QEEG to forecast time-dependent seizure risk. Clinical variables included cord blood gas values, Apgar scores, gestational age at birth, postmenstrual age (PMA), postnatal age, and birth weight. QEEG features included statistical moments, spectral power, and recurrence quantification analysis (RQA) features. We trained and evaluated Neo-GB on a University of California, San Francisco (UCSF) neonatal HIE dataset, augmenting training with publicly available neonatal electroencephalogram (EEG) datasets from Cork University and Helsinki University Hospitals. We assessed the performance of Neo-GB at providing dynamic and static forecasts with diagnostic performance metrics and incident/dynamic area under the receiver operating characteristic curve (iAUC) analyses. Model explanations were performed to assess contributions of QEEG features and channels to model predictions. The UCSF dataset included 60 neonates with HIE (30 with seizures). In subject-level static forecasting at 30 min after EEG initiation, baseline Neo-GB without time-dependent features had an area under the receiver operating characteristic curve (AUROC) of .76 and Neo-GB with time-dependent features had an AUROC of .89. In time-dependent evaluation of the initial seizure onset within a 24-h seizure occurrence period, dynamic forecast with Neo-GB demonstrated median iAUC = .79 (interquartile range [IQR] .75-.82) and concordance index (C-index) = .82, whereas baseline static forecast at 30 min demonstrated median iAUC = .75 (IQR .72-.76) and C-index = .69. Model explanation analysis revealed that spectral power, PMA, RQA, and cord blood gas values made the strongest contributions in driving Neo-GB predictions. Within the most influential EEG channels, as the preictal period advanced toward eventual seizure, there was an upward trend in broadband spectral power. This study demonstrates an ML model that combines QEEG with clinical features to forecast time-dependent risk of initial seizure onset in neonatal HIE. Spectral power evolution is an early EEG marker of seizure risk in neonatal HIE.

Performance investigation on a downdraft gasifier using corn waste as a solid biomass and co-feeding with hand gloves and used facemask waste

In India, an abundant source of corn waste is scattered throughout the country, ensure a consistent feedstock supply that can be easily converted into valuable products. Corncob waste, as a solid biomass, has significant potential energy content and can be converted through thermo-chemical processes like gasification. The co-gasification process is a viable solution for managing non-decomposing wastes, such as hand gloves and used face masks, due to their widespread use in domestic and industrial applications. Since hand gloves and used face masks are also difficult to recycle, so that the present investigation aims to utilize the co-gasification process to convert these materials into syngas.A downdraft gasifier, a fixed-bed closed type with a capacity of 5 kW for power generation, was used for the experimental work. The experiment involved using 90% corncob waste co-fed with 5% hand gloves and 5% used face masks. The performance characteristics, including gas composition, product gas composition, char yield, and tar yield, were analyzed. Operating parameters, such as reaction temperature, were varied from 700 to 900 °C, with the equivalence ratio ranging from 0.07 to 0.27.Increasing the reaction temperature led to an increase in the CO and H₂ volume percentages of the producer gas, up to 13.1 vol%, while significantly decreasing the CO₂ amount from 24.6 vol% to 19.3 vol%. CH₄ gas slightly increased from 15.8 vol% at 700 °C to 19.8 vol% at 800 °C but decreased to 19.0 vol% when the reaction temperature was further increased to 900 °C. As a result of the increase in combustible gases, the higher heating value (HHV) of the producer gas also increased with temperature. It was concluded that carbon monoxide (CO) and hydrogen (H₂) yields in the syngas increased at 900 °C, while carbon dioxide (CO₂) and methane (CH₄) decreased. However, further research is needed, especially with pilot-scale autothermal gasifier plants, to investigate the impact of adding hand gloves and used masks on the operations of such gasifiers. The produced green H2 were used an alternate fuel in diesel engine for power production in a localized area such as hospitals, industries, etc., or an effective fuel for fuel cell too.

A secure, privacy-preserving, and cost-efficient decentralized cloud storage framework using blockchain

Cloud services benefit countless users worldwide due to notable features, such as on-demand self-service, scalability, easy maintenance, etc. Secure storage and access to data in the cloud is critical. Cloud Identity and Access Management (IAM) service, which acts in a centralized way to provide access requests to the authenticated users. Controlled access sometimes fails to preserve the privacy of the sensitive information stored in the cloud due to several reasons, such as insider attacks, breaches of data security, or any other types of unauthorized access. This paper suggests a blockchain-assisted secure storage and access mechanism to secure sensitive data. Here blockchain is used as a trust management entity that verifies the identity of the user. Along with this it issues the Access Control Lists (ACLs) and identity token, and at the same time, it records all the interactions between the users and service providers. Data transmission is transparent since transactions are recorded. Importance is given to user privacy and decryption keys security. Linear(t,n) secret sharing scheme is used for key share generation and distribution. For experimentation, in MetaMask cryptocurrency wallet Goerli test network is used. Results reveal that our model consumes less cost to execute than other existing works. The total execution cost to upload and download a data file is 0.00281392 and 0.02455307 GoerliETH. Where the all verification operations such as identity token, ACL, access_log, and data integrity are executed in Zero gas value. The proposed model maintains a constant gas cost regardless of transaction volume, with costs of 33.04 ETH and 32.24 ETH for data upload and download. Moreover, we present a comparison of execution time performance in three different system configurations.

Transport properties of high Mach number hypersonic air plasmas

Abstract The collisional and transport properties of hypersonic plasmas have been simulated by an air plasma chemistry model, which includes collisions with electrons, ions and neutral species, elastic scattering, vibrational relaxation and a transport model. Species and thermal fluxes at the surface of the vehicle have been investigated as a function of post-shock gas temperature and species sticking coefficient for a fixed altitude of 50 km. At temperatures below about 5000 K, the leading species are vibrationally excited nitrogen molecules, while at higher temperatures the atomic oxygen and nitrogen dominate. Large fluxes of oxygen atoms have been observed in the simulations, on the order of 1020 cm − 2 s − 1, which may lead to high rates of surface oxidation. Another subject of this study is temperature equilibration. For electrons, equilibration takes tens of microseconds, while the vibrational temperature equilibration time vary widely; from a few microseconds to hundreds of microseconds, depending on the gas temperature. Finally, the adiabatic parameter γ was calculated for post-shock gas temperatures 5000 K and 10 000 K and total gas density 1.2 × 10 17 c m − 3 . For post-shock gas temperature 5000 K, only a slight reduction of γ from the ideal gas value of γ = 1.4 is observed, while for 10 000 K it drops to γ ≅ 1.26, which has a considerable impact on plasma properties. It was further established that the vibrational kinetics plays a leading role. While a single excited vibrational level of the N2 molecule captures the salient properties of the plasma, a detailed vibration kinetics is required for high-fidelity simulations.

Strain effects on electronic structure and optics of al-Doped monolayer GaS

This comprehensive study utilises rigorous first-principles calculations to meticulously investigate the influence of uniaxial tensile strain on the electronic configuration and optical behaviours of aluminium-doped gallium sulphide. The study highlights the modulation of electrical properties and optical responses in Al-doped monolayer GaS through the application of tensile strain. Notably, with increasing tensile strain, the bandgap value of the pristine GaS exhibits a pronounced decline, whereas the Al-doped variant maintains a more stable bandgap. A deeper exploration of the state density reveals the emergence of novel electronic states and energy levels in both the pristine and Al-doped monolayer GaS systems as tensile strain is applied. Crucially, the stabilising effect of the doped Al atoms minimises variations in the state density profiles of the Al-doped monolayer GaS systems, in contrast to their pristine counterparts. This result implies that fine control of the electrical structure and optical characteristics of Al-doped monolayer GaS may be achieved by the application of uniaxial tensile strain. The optoelectronic characteristics of GaS and its doped systems are explained in detail by these discoveries, which also offer a crucial theoretical foundation and direction for the use of these materials in optoelectronic devices.

Precision and uncertainty in natural gas calorific value estimation: advanced combinatorial predictive models for complex pipeline systems

Abstract In recent years, natural gas pipelines have been characterized by multiple intake points, the mixing of different gas sources, and significant variations in gas quality. The existing volumetric measurement system is no longer suitable for the development and operation of natural gas pipelines in China. To ensure accurate and equitable implementation of natural gas measurement, there is a gradual shift towards energy measurement. However, due to numerous measurement interfaces, installing chromatographs at all measurement stations would lead to substantial investment costs. Therefore, predicting the calorific value of natural gas is a key technology for energy measurement. In view of the issues existing in the current methods of obtaining natural gas calorific value, different prediction models of natural gas calorific value are constructed. According to the influencing factors of natural gas calorific value, the uncertainty evaluation is carried out, and the accuracy of different calorific value prediction models is analyzed by case data. The maximum error of regression equation, response surface analysis, BP neural network and genetic algorithm prediction model is 2.29%, 0.43%, 0.59% and 0.45% respectively. However, the combined calorific value (CCV) prediction model is 0.41%. The results indicate that the predicted value calculated by the CCV prediction model is closer to the actual value and has higher prediction performance, which provides a new method for the calorific value prediction and measurement management of natural gas.

The Development of Oil and Gas Diplomacy Policy between Timor Leste and Australia in the Timor Sea

Political strategy and future development of Oil and Gas Diplomacy in the Timor Sea from the Countries of Timor Leste and Australia for the development of the oil and gas industry in the interests of the country's economic welfare. The Timor Sea is an area that contains oil and gas (oil and gas) values ​​, such as the Elang-Kakatua Oil Field and the larger Laminaria-Corallina Field, which is localized in the west, the Greater Sunrise Field. Where Bayu Undang is gas worth more than 30 to 50 billion US dollars, it is located closer to the south coast of Timor Leste than oil and gas areas or other islands located in the Timor Sea or in the area of ​​the Timor Leste Sea and Australia, around $ 64.5 Billion from oil and gas production in the Timor Sea, big profits from these oil and gas fields in the future. The aim of the oil and gas diplomacy policy-making held by Timor Leste and Australia is to increase the value of Timor Leste-Australia diplomacy policy in future cooperation in oil and gas diplomacy between the two countries, as well as to explore the strategic factors expected by both countries which will be able to maximize the positive impact of policy development. The future of diplomacy on oil and gas energy sources between the two countries on the Timor Leste-Australia Maritime Border is to maintain national energy security to ensure general prosperity. In this work, the author uses qualitative research methods to collect data that is very relevant and useful to enrich writing and that is worthy of access. Then the results of this writing are used to deepen the future policy of oil and gas diplomacy between the two countries to strengthen diplomatic relations between Timor Leste and Australia, as well as open up opportunities for the political and social-cultural aspects of the two countries which prioritize the concept of a win-win solution from the beginning toward the future.

Role of Magma Oceans in Controlling Carbon and Oxygen of Sub-Neptune Atmospheres

Most exoplanets with a few Earth radii are more inflated than bare-rock planets with the same mass, indicating a substantial volatile amount. Neither the origin of the volatiles nor the planet’s bulk composition can be constrained from the mass–radius relation alone, and the spectral characterization of their atmospheres is needed to solve this degeneracy. Previous studies showed that chemical interaction between accreted volatile and possible molten rocky surface (i.e., magma ocean) can greatly affect the atmospheric composition. However, a variety in the atmospheric compositions of such planets with different properties remains elusive. In this work, we examine the dependence of atmospheric H, O, and C on planetary parameters (atmospheric thickness, planetary mass, equilibrium temperature, and magma properties such as redox state) assuming nebula gas accretion on an Earth-like core, using an atmosphere-magma chemical equilibrium model. Consistent with previous work, we show that atmospheric H2O fraction on a fully molten rocky interior with an Earth-like redox state is on the order of 10−2–10−1 regardless of other planetary parameters. Despite the solubility difference between H- and C-bearing species, C/H increases only a few times above the nebula value except for atmospheric pressure ≲1000 bar and H2O fraction ≳10%. This results in a negative O/H–C/O trend and depleted C/O below one-tenth of the nebula gas value under an oxidized atmosphere, which could provide a piece of evidence of rocky interior and endogenic water. We also highlight the importance of constraints on the high-pressure material properties for interpreting the magma–atmospheric interaction of inflated planets.

Differences in the Genesis and Sources of Hydrocarbon Gas Fluid from the Eastern and Western Kuqa Depression

The Kuqa Depression is rich in oil and gas resources and serves as a key production area in the Tarim Basin. However, controversy persists over the genesis of oil and gas in the various structural zones of the Kuqa Depression. This study employs natural gas composition analysis, gas carbon isotope analysis and gold pipe thermal simulation experiments, to comprehensively analyze the differences in the genesis and sources of hydrocarbon gas fluid from the eastern and western Kuqa Depression. The results show that the Kuqa Depression is dominated by alkane gas, with an average gas drying coefficient of 95.6, with nitrogen and carbon dioxide as the primary non-hydrocarbon gases. The average of δ13C1, δ13C2 and δ13C3 values in natural gas are −27.70‰, −20.43‰ and −21.75‰, respectively. Based on comprehensive natural gas geochemical maps, the CO2 in the natural gas from the Tudong and Dabei areas, as well as the KT-1 well of the Kuqa Depression, is thought to be of organic origin. Additionally, natural gas formation in the Tudong area is relatively simple, consisting entirely of thermally generated coal gas derived from the initial cracking of kerogen. The natural gas in the KT-1 well and the Dabei area are mixed gasses, formed by the initial cracking of kerogen from highly evolved lacustrine and coal-bearing source rocks, exhibiting characteristics resembling those of crude oil cracking gas. The methane (CH4) content of natural gas in the Dabei area is high and the carbon isotopes are unusually heavy. Considering the regional geological background, potential source rock characteristics and geochemical features may be related to the large-scale invasion of dry gas contributed by CH4 from highly evolved, underlying coal-bearing source rocks. Consequently, the CH4 content in the mixed gas is generally high (Ln (C1/C2) can reach up to 5.38), while the relative content of heavy components is low, though remains relatively unchanged. Thus, the map of the relative content of heavy components still reflects the characteristics of the original gas genesis (initial cracking of kerogen). Mixed-source gas was analyzed using thermal simulation experiments and natural gas composition ratio diagrams. The contributions of natural gas from deep, highly evolved coal-bearing source rocks in the KT-1 well and the Dabei area accounted for more than 90% and approximately 60%, respectively. This analysis provides theoretical guidance for natural gas exploration in the research area.

Impact of low-pressure pneumoperitoneum and deep neuromuscular blockade on surgeon satisfaction and patient outcomes in laparoscopic cholecystectomy patients: A prospective randomised controlled study.

The impact of laparoscopic surgery on homeostatic systems necessitates careful consideration of intra-abdominal pressure (IAP) management. This study investigated the effects of low-pressure pneumoperitoneum with deep neuromuscular blockade (NMB) on surgeon satisfaction, haemodynamics and post-operative outcomes in laparoscopic cholecystectomy patients. The study design involves prospective randomised control. Ninety patients were assigned to low (7-10 mmHg, n = 45) or normal (12-16 mmHg, n = 45) IAP groups. Deep NMB, guided by train-of-four monitoring, was administered. This study evaluated surgical rating scale scores, haemodynamics and post-operative outcomes through a literature review. A computer programme (IBM, SPSS) was used for statistical analysis. Chi-square and Mann-Whitney U tests were used to analyse patients' IAP levels, additional NMB requirements, surgical rating scale scores and numerical rating scales. Patient demographics and other intraoperative and post-operative variables were analysed with Student's t-test and the Mann-Whitney U test. Values of P < 0.05 were considered to indicate statistical significance. No significant demographic differences were observed. The low-pressure group exhibited lower post-operative pain (P < 0.01) and reduced analgesia requirements (P = 0.00). On analysis of the surgeon rating scale, no disparities were evident between the groups. NMB usage correlated with height and weight (P < 0.01). Heart rate showed no intergroup differences. The MAP measured after 15 min was lower in Group L, and the difference was significant (P = 0.023). The SAP measured after 30 min was lower in Group L, and the difference was significant (P = 0.017). Blood gas values and surgical field visibility were unaffected by the IAP. The positive correlations between NMB, height and weight aligned with previous research. This study highlights successful laparoscopic cholecystectomy under low IAP, deep NMB and favourable post-operative outcomes. Despite these limitations, the findings contribute to optimising laparoscopic surgical approaches.

Application of acetylene in multi-cylinder low heat rejection diesel engine fueled with ternary blend

The depletion of fossil fuels and environmental degradation have driven researchers worldwide to seek suitable alternative fuels for diesel engines. Internal combustion engines typically emit carbon monoxide (CO), hydrocarbon (HC), and smoke, contributing to environmental pollution. To address this issue, petroleum fuels can be substituted with alternative options like acetylene gas, hydrogen, CNG, or LPG. One effective strategy is to incorporate renewable fuels into diesel engines by partially or fully replacing diesel in a dual fuel mode (DFM). This research focuses on alternative renewable fuels for diesel engines like biodiesel and alcohol and its blends. The current research investigates the engine characteristics of diesel engines fueled with ternary blend (TB) fuel and different flow rates of acetylene in DFM. TB fuel was prepared using 70 % diesel, 20 % waste cooking oil biodiesel (WCOB), and 10 % methanol by volume. The induction of acetylene at different flow rates, such as 2, 4, and 6 lpm. Waste cooking oil is used to prepare biodiesel by transesterification. Partially stabilized zirconia (PSZ) is used to coat the cylinder head, piston crown, inlet, and exhaust valves with a thickness of 0.5 mm. The HC, CO, and smoke emissions are decreased by about 35.7 %, 29.8 %, and 21.6 %, respectively, for TB fuel with acetylene at 6 lpm at full load condition. The high calorific value of acetylene gas raised the in-cylinder temperature, significantly accelerating the combustion process. The heat release rate (HRR) and cylinder pressure are increased by 9.8 % and 6.8 %, respectively, at TB fuel with 6 lpm of acetylene induction. Acetylene induces rapid fuel combustion, resulting in increased energy transfer. The brake thermal efficiency (BTE) is improved by about 10.3 % for TB fuel with acetylene at 6 lpm and exhaust gas temperature (EGT) increased to 461oC at full load condition.

Cosmic-Ray Feedback on Bistable Interstellar Medium Turbulence

While cosmic rays (E ≳ 1 GeV) are well coupled to a galaxy’s interstellar medium (ISM) at scales of L > 100 pc, adjusting stratification and driving outflows, their impact on small scales is less clear. Based on calculations of the cosmic-ray diffusion coefficient from observations of the grammage in the Milky Way, cosmic rays have little time to dynamically impact the ISM on those small scales. Using numerical simulations, we explore how more complex cosmic-ray transport could allow cosmic rays to couple to the ISM on small scales. We create a two-zone model of cosmic-ray transport, with the cosmic-ray diffusion coefficient set at the estimated Milky Way value in cold gas but smaller in warm gas. We compare this model to simulations with a constant diffusion coefficient. Quicker diffusion through cold gas allows more cold gas to form compared to a simulation with a constant, small diffusion coefficient. However, slower diffusion in warm gas allows cosmic rays to take energy from the turbulent cascade anisotropically. This cosmic-ray energization comes at the expense of turbulent energy which would otherwise be lost during radiative cooling. Finally, we show our two-zone model is capable of matching observational estimates of the grammage for some transport paths through the simulation.

Deciphering origins of hydrocarbon deposits by means of intramolecular carbon isotopes of propane adsorbed on sediments

Hydrocarbons are one of the important fluids within the Earth’s crust, and different biotic and abitoic processes can generate hydrocarbon during geological periods. Tracing the sources and sinks of hydrocarbons can help us better understand the carbon cycle of the earth. In this study, an improved approach of adsorbed hydrocarbons extraction from sediments was established. The improved thermal desorption approach, compound-specific isotope analysis and position-specific isotope analysis were integrated to investigate the molecular and intramolecular isotope fractionation between trace hydrocarbon gases within sediments and geological hydrocarbon deposits. The isotopic compositions of the terminal position carbon of propane (δ13Cterminal) serves as a correlation indicator between trace hydrocarbon gases within sediments and geological hydrocarbon deposits. The tight sandstone gas from the Turpan-Hami Basin is a first case study for the application of this novel method to trace hydrocarbon origins. The results showed that the hydrocarbons in the tight sandstone gases in the study area most likely originated from humic organic matter (type III kerogen) at an early mature stage. δ13Cterminal values of the thermally desorbed propane gases from different source rocks were distinguishable and the values of the tight sandstone gases significantly overlap with those of the Lower Jurassic Sangonghe source rocks, suggesting their genetic relationship. Overall, the results provided novel position-specific carbon isotopic constraints on origins of hydrocarbons.

Enrichment conditions and resource potential of coal-rock gas in Ordos Basin, NW China

To reveal the enrichment conditions and resource potential of coal-rock gas in the Ordos Basin, this paper presents a systematic research on the sedimentary environment, distribution, physical properties, reservoir characteristics, gas-bearing characteristics and gas accumulation play of deep coals. The results show that thick coals are widely distributed in the Carboniferous–Permian of the Ordos Basin. The main coal seams Carboniferous 5# and Permian 8# in the Carboniferous–Permian have strong hydrocarbon generation capacity and high thermal evolution degree, which provide abundant materials for the formation of coal-rock gas. Deep coal reservoirs have good physical properties, especially porosity and permeability. Coal seams Carboniferous 5# and Permian 8# exhibit the average porosity of 4.1% and 6.4%, and the average permeability of 8.7×10−3 μm2 and 15.7×10−3 μm2, respectively. Cleats and fissures are developed in the coals, and together with the micropores, constitute the main storage space. With the increase of evolution degree, the micropore volume tends to increase. The development degree of cleats and fissures has a great impact on permeability. The coal reservoirs and their industrial compositions exhibit significantly heterogeneous distribution in the vertical direction. The bright coal seam, which is in the middle and upper section, less affected by ash filling compared with the lower section, and contains well-developed pores and fissures, is a high-quality reservoir interval. The deep coals present good gas-bearing characteristics in Ordos Basin, with the gas content of 7.5–20.0 m3/t, and the proportion of free gas (greater than 10%, mostly 11.0%–55.1%) in coal-rock gas significantly higher than that in shallow coals. The enrichment degree of free gas in deep coals is controlled by the number of macropores and microfractures. The coal rock pressure testing shows that the coal-limestone and coal-mudstone combinations for gas accumulation have good sealing capacity, and the mudstone/limestone (roof)-coal-mudstone (floor) combination generally indicates high coal-rock gas values. The coal-rock gas resources in the Ordos Basin were preliminarily estimated by the volume method to be 22.38×1012 m3, and the main coal-rock gas prospects in the Ordos Basin were defined. In the central-east of the Ordos Basin, Wushenqi, Hengshan–Suide, Yan'an, Zichang, and Yichuan are coal-rock gas prospects for the coal seam #8 of the Benxi Formation, and Linxian West, Mizhi, Yichuan–Huangling, Yulin, and Wushenqi–Hengshan are coal-rock gas prospects for the coal seam #5 of the Shanxi Formation, which are expected to become new areas for increased gas reserves and production.