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The article deals with the H2 consumption for different processing conditions and the composition of the processed pellets during the direct reduction process. The experiments are carried out at 600–1300 °C, with gas pressures of 1–5 bar, gas flow rates of 1–5 L min−1, and basicity indices of 0 to 2.15. Pellets with different compositions of TiO2, Al2O3, CaO, and SiO2 are analyzed. The gas flow rate is crucial, with 0–10 L min−1 leading to an H2 consumption of 0–5.1 kg H2/kg pellet. The gas pressure (0–10 bar) increases the H2 consumption from 0 to 5.1 kg H2/kg pellet. Higher temperatures (600–1300 °C) reduce H2 consumption from 5.1 to 0 kg H2/kg pellet, most efficiently at 950–1050 °C, where it decreases from 0.22 to 0.10 kg H2/kg pellet. An increase in TiO2 content from 0% to 0.92% lowers H2 consumption from 0.22 to 0.10 kg H2/kg pellet, while a higher Fe content (61–67.5%) also reduces it. An increase in SiO2 content from 0% to 3% increases H2 consumption from 0 to 5.1 kg H2/kg pellet. Porosity structure influences H2 consumption, with the average pore size decreasing from 2.83 to 0.436 mm with increasing TiO2 content, suggesting that micropores increase H2 consumption and macropores decrease it. [ABSTRACT FROM AUTHOR]

The construction of heterostructures is an effective strategy for enhancing the properties of functional materials. However, the problem of the weak built-in field at the heterointerface usually degrades the interfacial charge transfer efficiency, severely limiting the improvement of the sensing properties of gas sensors. To overcome this limitation, γ-Fe 2 O 3 /α-Fe 2 O 3 (p-p) heterojunction structures were constructed via a one-step hydrothermal method. Interestingly, the morphology and structure of the Fe 2 O 3 nanocrystals could be easily controlled by the amount of urea (CH 4 N 2 O). Thus, the response of Fe 2 O 3 -M to H 2 (200 ppm) at 280 °C was 2.2 and 1.2 times greater than that of Fe 2 O 3 –R and Fe 2 O 3 –N, respectively. In addition, density functional theory (DFT) calculations were used to explore the sensing mechanism in detail, further confirming the experimental conclusions. The strong and ultrafast response to hydrogen was attributed to the synergistic effects of the unique heterostructure and large specific surface area. The development of efficient and stable new hydrogen-sensing materials will help further expand their application scope in the sensing field. [Display omitted] • The γ-Fe 2 O 3 /α-Fe 2 O 3 heterostructure was prepared by a one-step hydrothermal method. • The morphology and structure of Fe 2 O 3 nanocrystals controlled by the amount of urea. • The γ-Fe 2 O 3 /α-Fe 2 O 3 heterostructure can improve the gas sensing performance of H 2. [ABSTRACT FROM AUTHOR]

The construction of heterojunctions is generally considered as one of the effective strategies to improve gas sensing performance. Herein, the NiO/Al 2 O 3 (NAO) hybrid structure is constructed by calcining Ni–Al layered double hydroxides (NiAl-LDHs). The specific surface area and pore size of NAO are effectively regulated by changing the content of NaOH. The XPS and BET characterization results indicate that NAO-5 exhibits a high oxygen vacancy content, a large specific surface area (468.524 m2 g−1), and abundant pore size. The hydrogen (H 2) sensitivity property of NAO was investigated, and NAO-5 exhibited outstanding gas sensing performance to 500 ppm H 2 at 370 °C, including high response (10.524), fast response recovery speed (21 and 30 s), and wide detection range (0.1–5000 ppm). The improved gas property is mainly attributed to the increased oxygen vacancies and specific surface area. This study provides a feasible approach for NiAl-LDHs in H 2 monitoring and early warning. [Display omitted] • NAO-based sensor was prepared by controlling the amount of NaOH to induce Ni–Al hydrotalcite derivatives. • NAO-based sensor exhibited remarkably enhanced response toward H 2. • NAO-based sensor displayed short response and recovery time to H 2 (21/30 s). • NAO-based sensor showed a wide detection range (5000-0.1 ppm) and a low detection limit (100 ppb). [ABSTRACT FROM AUTHOR]

Hydrogen (H2) energy, as a clean energy source, has high energy density and durability, while H2 is flammable and explosive, which requires strict safety technology measures to ensure the safety of high-pressure storage transportation. Therefore, the development of sensitive sensors is needed. In this study, In2O3 microspheres with different Pd loadings were fabricated by hydrothermal method. Compared with the pristine In2O3 gas sensor, the optimal operating temperature of the In2O3 sensor is reduced from 160 ℃ to 80 ℃ after loading Pd. Among the prepared Pd/In2O3 gas sensors, the response value of the 2 at% Pd/In2O3 sensor towards 1000 ppm H2 is 50.743 at 80 ℃. The response/recovery time is 80 s/235 s. The improved H2 sensing performance can be ascribed to the chemical and electron sensitization of Pd, and the formation of PdO, PdHx. This study shows that Pd-loaded In2O3 can effectively reduce the optimal operating temperature and enhance the response value for detecting H2 in the range of 5-5000 ppm. Therefore, this sensor has good application prospects for detecting H2 at low temperatures. [ABSTRACT FROM AUTHOR]

This study introduces machine learning (ML) algorithms to predict hydrogen (H 2) thermodynamic properties for geological storage, focusing on its mixtures with natural gas, nitrogen (N 2), and carbon dioxide (CO 2). Employing 1167 data samples, this research utilizes multiple linear regression (MLR), random forest (RF), gradient boosting (GB), and decision tree (DT) models, enhanced by sensitivity analysis for feature engineering. GB model's superior accuracy and efficiency over conventional statistical linear regression methods. The finding reveals that the GB model achieves superior performance, with an R2 value of 0.9998 for thermal capacity and the lowest mean absolute error (MAE)/root mean square error (RMSE) across all H 2 properties—density (1.51%, 2.06 kg/m3), viscosity (0.000078%, 0.000117 cp), thermal conductivity (0.000427%, 0.000849 W/m.K), and thermal capacity (8.79%, 26.06 J/g.K). Moreover, this ML-based approach not only demonstrates remarkable accuracy and efficiency but also suggests the potential of smart paradigms to further enhance the safety and transportability of underground hydrogen storage projects. Ultimately, this work will help the reservoir simulation at field scale to be more robust and reliable. [Display omitted] • Machine learning employed in the prediction of hydrogen's thermodynamic properties. • Four advanced ML-based models constructed by variables such as pressure, temperature, and hydrogen fraction. • Gradient boosting algorithm comparatively showed the highest accuracies. • ML achieved the lowest MAE/RMSE values for viscosity 0.000078/0.000117. [ABSTRACT FROM AUTHOR]

[Display omitted] Although photocatalytic H 2 production based on semiconductor materials has a wide potential application, it still facing challenges such as slow reaction kinetics or complex synthesis processes. To meet these challenges, the carbon dots loaded black g-C 3 N 4 (CN-B-CDs) was synthesized by simple calcination method to achieve efficient photothermal-assisted photocatalytic H 2 production. Photothermal imaging experiments confirmed the photothermal effect of CN-B and CDs as dual heat sources to increase the temperature of the composite system, thus improving the effective separation of photo-generated charges. In addition, multiple photocatalytic H 2 production tests exhibited that CN-B-CDs photocatalysts not only have strong stability but also can accommodate a variety of complex water bodies, which displayed the potential for industrial application. This study combined the photothermal effect and the mechanism by which the CDs promote the charge transfer to design a new photocatalytic H 2 production system and provided a new scheme for achieving efficient photothermal-assisted photocatalytic H 2 production using carbon-based materials. [ABSTRACT FROM AUTHOR]

Monolithic plate‐type photocatalyst with excellent light absorption, abundant active sites and strong mechanical adhesion is the growing trend of photocatalysis application, as referring to a photovoltaic panel. In this study, we report a large‐scale Pt/N−TiO2/Ti photocatalytic plate with granular and mesoporous structure, which shows a superior photocatalytic performance and adhesion than nanowires and nanosheets photocatalysts. The outstanding photocatalytic performance of Pt/N−TiO2/Ti is attributed to the large exposed surface area, enhanced light absorption, high separation efficiency of photogenerated carriers and excellent surface activity induced by single Pt atom cocatalyst. The best Pt/N−TiO2/Ti sample could exhibit an outstanding photocatalytic hydrogen production activity of 72547.9 μmol ⋅ h−1 ⋅ g−1, and a high apparent quantum efficiency of 47.07 % under a 350 nm light irradiation. It can be anticipated that the proposed method and insights would pave a solid way on the development and application of superior TiO2 based photocatalytic plate. [ABSTRACT FROM AUTHOR]

Dormancy has been suggested to be used for metal oxide gas sensors to specifically refer to their response decrease or disappearance after long periods of inactivity at room temperature. In this paper, 1 wt% Pt–SnO 2 composite nanoceramics with especially strong responses to hydrogen–containing atmospheres at room temperature, e.g. a response of 11170 to 1 % H 2 –20 % O 2 –N 2 , were successfully prepared through pressing and sintering. A clear dormancy has been observed for them as their responses decreased seriously with time when they were stored in ambient air at room temperature. Commercial ceramic heating plates (Metal Ceramics Heater, MCH) of 10 mm × 10 mm were attached to bars of 1 wt% Pt–SnO 2 composite nanoceramics. Dormant bars after 12 months of storage were completely regenerated through a heat–treatment of 200 °C for 10 min by attached MCH ceramic heating plates. According to X-ray photoelectron spectroscopy analyses, the formation of hydroxyl groups on SnO 2 in Pt–SnO 2 composite nanoceramics and deposition of impurity gases like H 2 S were proposed responsible for the dormancy, and their removal through mild heat–treatments result in the regeneration. It is suggested that heaters like commercial MCH ceramic heating plates should be included in future room–temperature gas sensors to provide a practicable regeneration from dormancy when needed. [ABSTRACT FROM AUTHOR]

Background: Fire models have used pyrolysis data from oxidising and non-oxidising environments for flaming combustion. In wildland fires pyrolysis, flaming and smouldering combustion typically occur in an oxidising environment (the atmosphere). Aims: Using compositional data analysis methods, determine if the composition of pyrolysis gases measured in non-oxidising and ambient (oxidising) atmospheric conditions were similar. Methods: Permanent gases and tars were measured in a fuel-rich (non-oxidising) environment in a flat flame burner (FFB). Permanent and light hydrocarbon gases were measured for the same fuels heated by a fire flame in ambient atmospheric conditions (oxidising environment). Log-ratio balances of the measured gases common to both environments (CO, CO2, CH4, H2, C6H6O (phenol), and other gases) were examined by principal components analysis (PCA), canonical discriminant analysis (CDA) and permutational multivariate analysis of variance (PERMANOVA). Key results: Mean composition changed between the non-oxidising and ambient atmosphere samples. PCA showed that flat flame burner (FFB) samples were tightly clustered and distinct from the ambient atmosphere samples. CDA found that the difference between environments was defined by the CO-CO2 log-ratio balance. PERMANOVA and pairwise comparisons found FFB samples differed from the ambient atmosphere samples which did not differ from each other. Conclusion: Relative composition of these pyrolysis gases differed between the oxidising and non-oxidising environments. This comparison was one of the first comparisons made between bench-scale and field scale pyrolysis measurements using compositional data analysis. Implications: These results indicate the need for more fundamental research on the early time-dependent pyrolysis of vegetation in the presence of oxygen. Composition of pyrolysis gases measured in non-oxidising and ambient atmospheric conditions has been compared using compositional data analysis. Mean compositions changed between the non-oxidising and ambient atmosphere samples. These results indicate the need for more fundamental research on the early time-dependent pyrolysis of vegetation in the presence of oxygen. [ABSTRACT FROM AUTHOR]

I derive a stationary distribution of lifetime wealth accumulation factor in a model featuring inheritance of productivity, wealth, and health condition, where lifetime wealth is the sum of financial wealth and human wealth. Assuming ex-ante heterogeneity in the death rate, I show that the distribution of the lifetime wealth accumulation factor is constituted by a weighted sum of shape-differing Pareto distributions. It is shown that raising the wealth tax reduces inequality of lifetime wealth not only within a death-rate type but also across all the death-rate types. [ABSTRACT FROM AUTHOR]

The paper explores the relationship between the shadow economy, corruption, and taxes in 25 high-financial developed countries (HFDCs) and 30 low-financial developed countries (LFDCs) using the PVAR method. The results of the impulse-response function show that the corruption perception index (CPI) has a positive correlation with tax revenue and the shadow economy in HFDCs, while tax revenue and the shadow economy are negatively correlated. In contrast, in LFDCs, the shadow economy has a positive correlation with tax revenue and a negative correlation with the CPI. In addition, the study also suggests that there is no relationship between tax revenue and the CPI. From the above findings, we propose several related policies for each group of countries.

The aging of society is one of the most important trends shaping the social, economic and political life of the 21st century. However, with the increasing number of people of retirement age, the problem of ensuring adequate conditions for a longer life arises. The state influences these conditions through the pension security system, including taxation of pensions. The paper attempts to answer the question whether taxation of remunerations and public pension benefits may have a significant impact on making decisions about choosing a country of work in the common market. For this purpose, Member States have been ranked in terms of two dimensions—the conditions of taxation of wages and the conditions of taxation of retirement benefits. The countries were classified using a multi-criteria comparative analysis and the agglomeration method. The study shows that taxing salaries and pension benefits is of marginal importance from the point of view of an employee’s decision-making. The main factors are the average expenditure on net salaries and the average expenditure on net pension benefits.

Abstract Background Retinopathy of Prematurity (ROP) is a proliferative retinal vascular disease occurring in the retina of premature infants and is the main cause of childhood blindness. Nowadays anti-VEGF and retinal photocoagulation are mainstream treatments for ROP, but they develop a variety of complications. Hydrogen (H2) is widely considered as a useful neuroprotective and antioxidative therapeutic method for hypoxic-ischemic disease without toxic effects. However, whether H2 provides physiological angiogenesis promotion, neovascularization suppression and glial protection in the progression of ROP is largely unknown.This study aims to investigate the effects of H2 on retinal angiogenesis, neovascularization and neuroglial dysfunction in the retinas of oxygen-induced retinopathy (OIR) mice. Methods In this study, mice that were seven days old and either wild-type (WT) or Nrf2-deficient (Nrf2−/−) were exposed to 75% oxygen for 5 days and then returned to normal air conditions. Different stages of hydrogen gas (H2) inhalation were administered. Vascular obliteration, neovascularization, and blood vessel leakage were analyzed and compared. To count the number of neovascularization endothelial nuclei, routine HE staining of retinal sections was conducted. Immunohistochemistry was performed using DyLight 594 labeled GSL I-isolectin B4 (IB4), as well as primary antibodies against proliferating cell nuclear antigen (PCNA), glial fibrillary acidic protein (GFAP), and Iba-1. Western blots were used to measure the expression of NF-E2-related factor 2 (Nrf2), vascular endothelial growth factor (VEGF), Notch1, Dll4, and HIF-1α. Additionally, the expression of target genes such as NQO1, HO-1, Notch1, Hey1, Hey2, and Dll4 was measured. Human umbilical vein endothelial cells (HUVECs) treated with H2 under hypoxia were used as an in vitro model. RT-PCR was used to evaluate the mRNA expression of Nrf2, Notch/Dll4, and the target genes. The expression of reactive oxygen species (ROS) was observed using immunofluorescence staining. Results Our results indicate that 3–4% H2 does not disturb retinal physiological angiogenesis, but ameliorates vaso-obliteration and neovascularization in OIR mice. Moreover, H2 prevents the decreased density and reverses the morphologic and functional changes in retinal astrocytes caused by oxygen-induced injury. In addition, H2 inhalation reduces microglial activation, especially in the area of neovascularization in OIR mice. H2 plays a protective role in vascular regeneration by promoting Nrf2 activation and suppressing the Dll4-induced Notch signaling pathway in vivo. Also, H2 promotes the proliferation of HUVECs under hypoxia by negatively regulating the Dll4/Notch pathway and reducing ROS levels through Nrf2 pathway aligning with our findings in vivo.Moreover, the retinal oxygen-sensing mechanisms (HIF-1α/VEGF) are also involved in hydrogen-mediated retinal revascularization and neovascularization suppression. Conclusions Collectively, our results indicate that H2 could be a promising therapeutic agent for POR treatment and that its beneficial effect in human ROP might involve the activation of the Nrf2-Notch axis as well as HIF-1α/VEGF pathways. Graphical Abstract

The escalating issue of plastic waste generation has prompted the search for an effective solution to address these challenges. In this study, we present a novel plasma‐enabled strategy for the rapid breakdown of various types of plastic wastes, including mixtures, into high‐value carbon nanomaterials and hydrogen. The H2 yield and selectivity achieved through the implemented catalyst‐free plasma‐enabled strategy are 14.2 and 5.9 times higher, respectively, compared to those obtained with conventional thermal pyrolysis under similar conditions. It is noteworthy that this catalyst‐free plasma alone approach yields a significantly higher energy yield of H2 (gH2/kWh) compared to other pyrolysis processes. By coupling plasma pyrolysis with thermal catalytic process, employing of 1 wt . % M/CeO2 (M=Fe, Co, and Ni) atomically dispersed catalysts can further enhance hydrogen production. Specifically, the 1 wt . % Co/CeO2 catalyst demonstrated excellent catalytic performance throughout the 10 cycles of plastic waste decomposition, achieving the highest H2 yield of 46.7 mmol/gplastic (equivalent to 64.4 % of theoretical H2 production) and nearly 100 % hydrogen atom recovery efficiency at the 7th cycle. Notably, the H2 yield achieved over the atomically dispersed Fe on CeO2 surface (1 wt . % Fe/CeO2) in the integrated plasma‐thermal catalytic process is comparable to that obtained with Fe particles on CeO2 surface (10 wt . % Fe/CeO2). This outcome, demonstrated with single‐atom catalysts, offers a promising avenue for cost‐effective and efficient chemical plastic recycling. Through a combination of experimental and computational efforts, we have provided an in‐depth understanding of the catalytic mechanisms of the investigated single atom catalysts in the developed plasma‐enabled process. This innovative and straightforward approach provides a promising and expedient strategy for continuously converting diverse plastic waste streams, including mixed and contaminated sources, into high‐value products conducive to a circular plastic economy. [ABSTRACT FROM AUTHOR]

Various microorganisms are present in natural waters, and understanding their impact on the photocatalytic behavior of photocatalysts is crucial, especially in large-scale hydrogen production. In line with this, we conducted a systematic investigation into the influence of Escherichia coli on the photocatalytic performance of TiO 2 nanoparticles for H 2 evolution. The findings revealed a significant reduction in the photocatalytic activity of TiO 2 nanoparticles in the presence of Escherichia coli. Specifically, the H 2 evolution rate was observed to be 57% lower (8.3 mmol g−1 h−1) compared to when Escherichia coli was absent (19.1 mmol g−1 h−1). The primary reason for this phenomenon appears to be the rupture of Escherichia coli cells during the photocatalytic process. As a result, intracellular proteins are released and subsequently adsorbed onto the surface of TiO 2 nanoparticles, impeding the photocatalytic hydrogen evolution reaction. These results provide valuable insights that can inform the design of future photocatalytic hydrogen production processes. [Display omitted] • Effect of E. coli on the photocatalytic activity of TiO 2 nanoparticles. • Preliminary study on the influencing mechanism of E. coli. • Discover the adsorption of E. coli intracellular substances plays a key role. • Discover effect of E. coli on stability of TiO 2 is negligible. • Offer data for design of photocatalytic H 2 production processes. [ABSTRACT FROM AUTHOR]

The interaction of H, H2, and MgH2 with graphene is investigated using the density functional theory to explore the possibility of exploiting graphene or functionalized graphene as a hydrogen storage medium. The H atom is positioned at various distances from the graphene surface and the energetics are computed in detail. The extent of interaction of the s electron of H with graphene's pz electrons is well brought out. Similar investigations are carried out for H2, MgH2. In the case of H atom, a HC covalent bond is formed. This process turns out to be a prerequisite for proton transfer through graphene. Interactions of H2 and MgH2 with graphene are different from that of H. It leads to the conclusion that functionalized graphene will better substrate/candidate for applications like hydrogen storage. [ABSTRACT FROM AUTHOR]

The NO-reburning by C 3 H 8 /H 2 mixtures with N 2 and CO 2 dilutions is systematically studied using a jet-stirred reactor. Experimental and kinetic studies are performed to assess the impacts of temperature (T), equivalence ratio (Φ), H 2 proportion in fuel, initial NO volume fraction (X NO), and CO 2 volume fraction (X CO2). NO-reburning and HCN formation are inhibited with CO 2 dilution. The inhibition of CO 2 on NO-reburning diminishes at T > 1200 K and Φ > 1.5. The NO reduction efficiency peaks at T = 1200–1300 K when Φ ≥ 1. At Φ = 2.2 and T = 1300 K, NO reduction amounts to 71.7% with CO 2 dilution. With X H2 /(X H2 + X C3H8) ≤ 0.5, the inhibition of H 2 on NO-reburning with CO 2 dilution is weak. The recommended reaction condition is identified to reduce both NO and CO 2 emissions. This research provides new insights into NO-reburning using C 3 H 8 /H 2 mixtures with N 2 and CO 2 dilutions. • At T = 1300 K and Φ = 2.2, 71.7% NO is reduced when diluted with CO 2. • 50% H 2 addition reduces carbon emissions and keeps high NO reduction efficiency. • The CO 2 dilution inhibits HCN generation and NO reduction. • The optimal Φ for NO-reburning with CO 2 dilution increases with T. [ABSTRACT FROM AUTHOR]

Photocatalytic overall splitting of pure water (H2O) without sacrificial reagent to hydrogen (H2) and oxygen (O2) holds a great potential for achieving carbon neutrality. Herein, by anchoring cobalt sulfide (Co9S8) as cocatalyst and cadmium sulfide (CdS) as light absorber to channel wall of a porous polymer microreactor (PP12), continuous violent H2 and O2 bubbling productions from photocatalytic overall splitting of pure H2O without sacrificial reagent is achieved, with H2 and O2 production rates as high as 4.41 and 2.20 mmol h−1 gcat.−1 respectively. These are significantly enhanced than those in the widely used stirred tank‐type reactor in which no O2 is produced and H2 production rate is only 0.004 mmol h−1 gcat.−1. Besides improved charge separation and interaction of H2O with photocatalyst in PP12, bonding interaction of Co9S8 with PP12 creates abundant catalytic active sites for simultaneous productions of H2 and O2, thus leading to the significantly enhanced H2 and O2 bubbling productions in PP12. This offers a new strategy to enhance photocatalytic overall splitting of pure H2O without sacrificial reagent. [ABSTRACT FROM AUTHOR]

Lithium tantalate (LiTaO3) perovskite finds wide use in pyroelectric detectors, optical waveguides and piezoelectric transducers, stemming from its good mechanical and chemical stability and optical transparency. Herein, we present a method for synthesis of LiTaO3 nanoparticles using a scalable Flame Spray Pyrolysis (FSP) technology, that allows the formation of LiTaO3 nanomaterials in a single step. Raman, XRD and TEM studies allow for comprehension of the formation mechanism of the LiTaO3 nanophases, with particular emphasis on the penetration of Li atoms into the Ta-oxide lattice. We show that, control of the High-Temperature Particle Residence Time (HTPRT) in the FSP flame, is the key-parameter that allows successful penetration of the -otherwise amorphous- Li phase into the Ta2O5 nanophase. In this way, via control of the HTPRT in the FSP process, we synthesized a series of nanostructured LiTaO3 particles of varying phase composition from {amorphous Li/Ta2O5/LiTaO3} to {pure LiTaO3, 15–25 nm}. Finally, the photophysical activity of the FSP-made LiTaO3 was validated for photocatalytic H2 production from H2O. These data are discussed in conjunction with the role of the phase composition of the LiTaO3 nanoparticles. More generally, the present work allows a better understanding of the mechanism of ABO3 perovskite formation that requires the incorporation of two cations, A and B, into the nanolattice. [ABSTRACT FROM AUTHOR]

Both dissolved H2 in the Urumqi 04 spring water and the H2 in the soil of the Aksu fault belong to the A-type monitoring points of Xinjiang earthquake monitoring, prediction, and evaluation. This paper takes the two as research objects, and analyzes the dynamic variation characteristics of H2 concentration in different occurrence forms. The R-value scoring method and Molchan chart method were used to test the earthquake-reflecting efficiency of H2 concentration and to extract abnormal indexes. The mechanism of H2 reflecting earthquakes in different occurrence forms is discussed and analyzed. The conclusions are as follows: The concentration of dissolved H2 in the Urumqi 04 spring water is less affected by meteorological factors, while the concentration of H2 in the soil of the Aksu fault is influenced by both air pressure and air temperature, mainly by air temperature. The R-value scoring method and Molchan chart method showed that both monitoring points had good short-term prediction efficiency. The good short-term prediction performance of H2 measurement is due to the stable physical and chemical properties of H2 and its extremely fast migration speed. [ABSTRACT FROM AUTHOR]

As an important gas signaling molecule, hydrogen sulfide (H2S) affects multiple organ systems, including the nervous, cardiovascular, digestive, and genitourinary, reproductive systems. In particular, H2S not only regulates female reproductive function but also holds great promise in the treatment of male reproductive diseases and disorders, such as erectile dysfunction, prostate cancer, varicocele, and infertility. In this review, we summarize the relationship between H2S and male reproductive organs, including the penis, testis, prostate, vas deferens, and epididymis. As lower urinary tract symptoms have a significant impact on penile erection disorders, we also address the potential ameliorative effects of H2S in erectile dysfunction resulting from bladder disease. Additionally, we discuss the regulatory role of H2S in cavernous smooth muscle relaxation, which involves the NO/cGMP pathway, the RhoA/Rho-kinase pathway, and K+ channel activation. Recently, various compounds that can alleviate erectile dysfunction have been reported to be at least partly dependent on H2S. Therefore, understanding the role of H2S in the male reproductive system may help develop novel strategies for the clinical treatment of male reproductive system diseases. [ABSTRACT FROM AUTHOR]

The deactivation of active sites caused by high-temperature sintering and the deposition of a large amount of carbon are the main difficulties in the reforming of methane using Ni-based catalysts. La, as a promoter, has an ameliorating effect on the defects of Ni-based catalysts. In this article, the mechanism of action of Ni-based catalysts with the introduction of the rare-earth metal additive La was reviewed, and the effects of La on the methane-reforming performance of Ni-based catalysts were examined. The physical properties, alkalinity, and activity of Ni-based catalysts can be enhanced by the use of the auxiliary agent La, which promotes the conversion of CH4 and CO2 as well as the selectivity towards H2 and CO formation in the reforming of methane. The reason why the Ni-based catalysts could maintain long-term stability in the presence of La was discussed. Furthermore, the current state of research on the introduction of different amounts of La in the reforming of methane at home and abroad was analyzed. It was found that 2–5 wt.% La is the most optimal quantity for improving the catalyst activity and stability, as well as the CO2 chemisorption. The limitations and directions for future research in the reforming of methane were discussed. [ABSTRACT FROM AUTHOR]

Spinel nickel aluminate samples are doped with various percentages of FexOy nanoparticles (1, 5, and 10%) wherein FexOy i.e. Fe2O3 and Fe3O4, are tested as a catalyst for the partial oxidation of methane. The as-synthesized nanocomposite materials were characterized by XRD, FTIR, and N2 adsorption–desorption techniques and the surface morphology was examined by HRTEM. The reduction behavior and the basicity were measured using H2-TPR and CO2-TPD techniques. The synthesized nanocomposites exhibit superior catalytic activity towards the partial oxidation of methane. The nanocomposite with 5% FexOy doping exhibited the highest catalytic activity (68%) at 600 °C along with the highest H2 selectivity (32%) among the 3 nanocomposites. Conversion of methane was increasing gradually and the time-on-stream of 4 h displayed higher activity and a stable profile when the reaction temperature was set to 600 °C. [ABSTRACT FROM AUTHOR]

Background: Allergic rhinitis (AR) is an allergic reaction dominated by the Th2 immune response in the nasal mucosa. The bacterial infection process affects the balance between Th1 and Th2 immune responses, and the level of exposure to environmental flora is closely related to the development of AR. Hydrogen (H2) is a medical molecule with anti-inflammatory and antioxidant properties. This study aimed to explore the possible mechanism of action of H2 on AR through its ability to regulate the balance of nasal flora. Methods: Serum eosinophil count (EOS), immunoglobulin E (IgE) concentration, visual analog scale (VAS), total nasal symptom score (TNSS), and rhinoconjunctivitis quality of life questionnaire (RQLQ) were observed before and after hydrogen inhalation in AR patients. Skin prick test (SPT) was used to determine allergen sensitisation. Community composition and relative abundance of nasal flora were examined before and after hydrogen inhalation and in normal subjects using 16S rRNA gene sequencing. Results: There were no adverse reactions during and after hydrogen inhalation in AR patients, with a favorable safety profile and significant improvements in VAS, TNSS, EOS, and IgE (P

Gas-phase hydrogen combustion is ubiquitous in industrial processes, and the associated surface kinetics on heat-resistant alloys plays a crucial role in designing efficient low-carbon technologies. We conducted new temperature programmed reduction experiments to determine the reducibility of materials following an oxidation cycle. These experiments were modeled using a thermoconsistent multi-site microkinetic model for H2 heterogeneous oxidation on Inconels, which was validated against literature experiments. This competitive adsorption model considers iron bulk content, hydrogen spillover and subsurface oxygen migration on hydrogen surface oxidation kinetics. New X-ray diffraction experiments confirmed the postulated crystallographic structures in the Inconel samples, suggesting their presence on the surface scale. The phenomenological model was coupled with several state-of-the-art gas-phase oxidation mechanisms to assess gas/surface reactions interaction as a function of material and temperature. The results reveal a complex interaction in which surface removes H radicals from the gas-phase, while the Bradford (H2+OH) reaction converts OH into H2O, promoting water adsorption on Inconel. This interaction was found to give rise to gas-phase thermokinetic oscillations. The model predicts a non-monotonous effect of reactor area-to-volume ratio on reactivity and emphasizes the impact of Inconel composition on product selectivity. Overall, the multi-site model provides new insight into the contrasting reactivities among active sites, bridging the gap between material science and heterogeneous combustion modeling.

Hydrogen sulfide (H 2 S) methane (CH 4) reforming (H 2 SMR) is a promising process for sustainable energy production from conventional fuels, offering triple benefits for generating clean hydrogen (H 2), consuming toxic H 2 S, and producing an economically valuable by-product carbon disulfide (CS 2). In this work, we studied the optimal operating conditions and assessed the economic feasibility of the non-catalytic H 2 SMR process, employing a combination of kinetic modeling, process modeling, and techno-economic analysis. Plug flow reactor simulations were performed with our newly developed mechanism to shed light on the optimal operating conditions. It was concluded that a H 2 S/CH 4 molar feed ratio of 2 results in the highest hydrogen production rate, and a feed ratio of 1–2 and a temperature of 1100–1300 °C are needed to maximize the CS 2 production rate. However, feed ratios higher than 2 increase the conversion rate of CH 4 and therefore benefit the purity of the H 2 product. Comparing the cases for a feed ratio of 2 at 1300 °C and a feed ratio of 9 at 1200 °C, the cost is significantly higher for the feed ratio of 9, mainly attributed to the higher electricity cost for higher inlet flow rate and H 2 S recycling, as well as the cost for the additional steam required during the preheating process. The cost of hydrogen production by H 2 SMR process could be as low as $1.47/kgH 2 for a feed ratio of 2 and solar PV as an energy source, which is more competitive than a cost of $1.97/kgH 2 for the steam methane reforming process. Furthermore, since CS 2 is a valuable by-product, the higher amount of CS 2 formed at a feed ratio of 2 becomes the main source of revenue, which completely covers the cost of hydrogen production. This study demonstrates the huge potential of H 2 SMR process as a clean and economic-competitive way to produce hydrogen. • Studied H 2 SMR process using kinetic, process modeling, and techno-economic analysis. • Discussed optimal operating conditions for maximizing H 2 and CS 2 yields. • Conducted sensitivity analysis of power source and feed ratio on H 2 production cost. • Concluded that CS 2 yield in H 2 SMR could cover the cost of H 2 production. [ABSTRACT FROM AUTHOR]

Direct decomposition of H 2 S not only generates H 2 but also reduces sulfur (S) emission. Proper catalysts and/or reactant materials are needed to catalyze its dissociation and accommodate the decomposed S in an economical way. Here, by using the density functional theory (DFT) based calculations, we show that Aluminum (Al) can facilitate the dehydrogenation of H 2 S and the formation of H 2. The remaining S adatoms continue to accumulate on Al surface to reach high S coverage (>0.6 monolayer, ML). Then, S atoms react with surface Al atoms to afford a layer of amorphous Al 2 S 3 (a cathode material for Al–S battery) at relatively low temperature (e.g. 773 K), which will transform into crystal phase at higher temperature (e.g. 1073 K). Our research presents a new way to produce H 2 and Al 2 S 3 from H 2 S and Al. [Display omitted] • H 2 S molecules can decompose on all three low-index Al surfaces via two dehydrogenation steps. For the first step, the rank of the energy barriers is Al(110) < Al(111) < Al(100), while for the second step, it changes to Al(100) < Al(111) < Al(110). • As The H 2 S coverage increases, the first H 2 S dehydrogenation barrier becomes slightly higher. • On the S-covered Al(111), the H 2 S dehydrogenation barrier increase with the increasing S coverage. • At high S coverage (5/8 ML), S adatoms react with the surface Al atoms to form Al 2 S 3. A layer of amorphous Al 2 S 3 will be formed at 773 K and will transform into the crystal phase at higher temperature (1073 K). [ABSTRACT FROM AUTHOR]

Transition metal dichalcogenides (TMDs), particularly monolayer TMDs with direct bandgap properties, are key to advancing optoelectronic device technology. WSe2 stands out due to its adjustable carrier transport, making it a prime candidate for optoelectronic applications. This study explores monolayer WSe2 synthesis via H2-assisted CVD, focusing on how carrier gas flow rate affects WSe2 quality. A comprehensive characterization of monolayer WSe2 was conducted using OM (optical microscope), Raman spectroscopy, PL spectroscopy, AFM, SEM, XPS, HRTEM, and XRD. It was found that H2 incorporation and flow rate critically influence WSe2's growth and structural integrity, with low flow rates favoring precursor concentration for product formation and high rates causing disintegration of existing structures. This research accentuates the significance of fine-tuning the carrier gas flow rate for optimizing monolayer WSe2 synthesis, offering insights for fabricating monolayer TMDs like WS2, MoSe2, and MoS2, and facilitating their broader integration into optoelectronic devices. [ABSTRACT FROM AUTHOR]

The efficient hydrogen-production through the Aluminum-water reaction has become a prominent subject of interest. The impediment encountered in the reaction can be effectively alleviated by Aluminum-based alloy. In this study, density functional theory (DFT) was utilized to explore the mechanism of water decomposition stage on the surface of aluminum and gallium alloy (AGA). Through surface reaction calculations of 12 stable AGA configurations, it was gradually revealed that the optimal alloy ratio was gallium-to-aluminum at 3.5:1. Analysis of the density of states (DOS) indicated that the presence of gallium amplified the activity of surface aluminum. Moreover, frontier orbital theory and charge density maps confirmed that, due to the weak interaction between Ga and ions, the presence of H 2 inhibited Ga passivation, thereby enhancing the reactivity of AGA. This paper provided valuable insights into the surface reaction mechanisms of AGA using DFT, offering theoretical support for hydrogen production processes. • Density functional theory investigated the early stages of AGA-water reaction. • Modeling AGA (Ga proportions 73.8%–81.2%) yields 12 stable configurations. • Ga:Al = 3.5:1 exhibits highest energies for O 2 , H 2 O, and co-adsorption. • Ga enhances AGA's catalytic activity, shown in DOS graphs comparisons. • AGA plays dual roles in surface hydrogen dynamics. [ABSTRACT FROM AUTHOR]

CO and H 2 S poisoning of Pt-based catalysts for hydrogen oxidation reaction (HOR) stands as one of the long-standing hindrances to the widespread commercialization of proton exchange membrane fuel cells. In this paper, a Ru/Ti 4 O 7 catalyst is successfully synthesized by the microwave-thermal method. This Ru/Ti 4 O 7 catalyst shows a much higher noble metal mass activity than those of commercial PtRu/C and conventional Ru/C catalysts. The performance of the Ru/Ti 4 O 7 catalyst under the exist of CO or H 2 S shows insignificant current decay, which is far superior to commercial PtRu/C and Pt/C catalysts. In this Ru/Ti 4 O 7 catalyst, the electron transfer between Ru and Ti to form d-p orbital hybridization is considered to be responsible for the favorable catalytic HOR performance and the corresponding CO and H 2 S tolerance. The interaction mechanism formed by electron transfer may open a promising way for the subsequent development of anti-poisoning catalysts for PEM fuel cell hydrogen oxidation reaction. [Display omitted] • Ru/Ti 4 O 7 catalyst shows a superior noble metal mass activity than those of commercial Pt–Ru/C based catalysts. • Ru/Ti 4 O 7 catalyst exhibits excellent resistance to CO poisoning. • The catalyst is extremely resistant to H 2 S while remaining CO-tolerant. • MSI of Ru/Ti 4 O 7 ensures catalytic activity and anti-poisoning properties. [ABSTRACT FROM AUTHOR]

Low-carbon conversion of hydrocarbon fuels and feedstocks, as well as the macroscopic production of H 2 , are central focus in the advancement of high-value and efficient conversion of CH 4. The effects of Ar addition ratio, discharge power and temperature on the results of plasma methane cracking were investigated on a dielectric barrier discharge (DBD) plasma experimental system. The results show that the addition of Ar can improve the methane conversion, and the optimal ratio of CH 4 conversion to H 2 production after the effect is CH 4 : Ar = 1:1, at which the methane conversion reaches 49.62% and the H 2 selectivity reaches 52.66%. The plasma at 25 °C can make the methane conversion close to the effect of catalytic cracking at 600 °C, while the H 2 selectivity is lower, the H 2 generation is 32.59% lower than the latter, and the products have more C 2 –C 4 hydrocarbon impurities. The solid byproduct resulting from the DBD plasma cracking of methane primarily consisted of carbon black, possessing an average particle size of 62.21 nm. The incorporation of Ar and the amplification of power augment the CH* radical intensities, which suggests both conditions contribute positively to the dissociation of the CH 4 molecule. [Display omitted] • The optimal ratio of CH 4 to Ar stands at 1:1. • Plasma operating at 25 °C can mimic the catalytic thermal cracking effect at 600 °C. • The generation of the solid-phase product, carbon black is induced by the plasma. • An increase in the C 2 –C 4 product is observed under plasma activity. [ABSTRACT FROM AUTHOR]

This paper presents a theoretical analysis of the selected properties of HCNG fuel calculations and a literature review of the other fuels that allow the storage of ecologically produced hydrogen. Hydrogen has the most significant CO2 reduction potential of all known fuels. However, its transmission in pure form is still problematic, and its use as a component of fuels modified by it has now become an issue of interest for researchers. Many types of hydrogen-enriched fuels have been invented. However, this article will describe the reasons why HCNG may be the hydrogen-enriched fuel of the future and why internal combustion (IC) piston engines working on two types of fuel could be the future method of using it. CO2 emissions are currently a serious problem in protecting the Earth's natural climate. However, secondarily, power grid stabilization with a large share of electricity production from renewable energy sources must be stabilized with very flexible sources—as flexible as multi-fuel IC engines. Their use is becoming an essential element of the electricity power systems of Western countries, and there is a chance to use fuels with zero or close to zero CO2 emissions, like e-fuels and HCNG. Dual-fuel engines have become an effective way of using these types of fuels efficiently; therefore, in this article, the parameters of hydrogen-enriched fuel selected in terms of relevance to the use of IC engines are considered. Inaccuracies found in the literature analysis are discussed, and the essential properties of HCNG and its advantages over other hydrogen-rich fuels are summarized in terms of its use in dual-fuel (DF) IC engines. [ABSTRACT FROM AUTHOR]

Nodular heterotopia (NH)–related drug‐resistant epilepsy is challenging due to the deep location of the NH and the complexity of the underlying epileptogenic network. Using ictal stereo‐electroencephalography (SEEG) and functional connectivity (FC) analyses in 14 patients with NH‐related drug‐resistant epilepsy, we aimed to determine the leading structure during seizures. For this purpose, we compared node IN and OUT strength between bipolar channels inside the heterotopia and inside gray matter, at the group level and at the individual level. At seizure onset, the channels within NH belonging to the epileptogenic and/or propagation network showed higher node OUT‐strength than the channels within the gray matter (p =.03), with higher node OUT‐strength than node IN‐strength (p =.03). These results are in favor of a "leading" role of NH during seizure onset when involved in the epileptogenic‐ or propagation‐zone network (50% of patients). However, when looking at the individual level, no significant difference between NH and gray matter was found, except for one patient (in two of three seizures). This result confirms the heterogeneity and the complexity of the epileptogenic network organization in NH and the need for SEEG exploration to characterize more precisely patient‐specific epileptogenic network organization. [ABSTRACT FROM AUTHOR]

Despite the increasing attention on energy poverty due to its health implications, the South African story is yet to be told, while pathways of influence have received little empirical investigation in the extant literature. This study examines how energy poverty affects mental distress in post-apartheid South Africa and explores gender and locational heterogeneities in outcomes as well as potential pathways. We use five years of longitudinal data extracted from the National Income Dynamics Survey (NIDS). We employ the Lewbel instrumental variable method to resolve endogeneity and apply causal mediation analysis to identify potential channels of effect. The findings suggest that energy poverty is associated with an increase in mental distress. This outcome is consistent across different estimation methods and conceptualisations of energy poverty. The deteriorating effect of energy poverty on mental distress is more pronounced among females and rural residents. We further establish that experiences of persistent cough and chest pains/tightness serve as potential pathways in the link between energy poverty and mental distress. We encourage the South African government to increase budgetary allocations to the free basic electricity policy and provide connection subsidies to poor households, which have the potential to alleviate energy poverty and reduce mental distress as a result.

Sulfur hexafluoride (SF6) is the most widely used gas insulation dielectric in power system, Currently, SF6 degradation technology based on non-thermal plasma faces issues with high content of difficult-to-treat byproducts like SO2F2. This study proposes improving the SF6 destruction and removal efficiency (DRE) through tandem DBD degradation and investigates the impact of adding H2 on the tandem DBD degradation of SF6 and its decomposition products. The results show that under conditions of 2% initial SF6 concentration, 1.5% H2, 150 mL/min gas flow rate, and 80W input power, the DRE in the first-stage tube is 73.2%, reaching 78.02% in the second-stage tube, and the DRE of SF6 in the dual-stage tandem reaches as high as 82.82%. In terms of decomposition products, there is no difference in the types of products formed in the two reaction tubes when H2 is added, and the main products are SO2F2, SO2, SOF2, and SOF4. The addition of H2 will inhibit the formation of S-O-F gas products, improves DRE and significantly regulates the distribution of degradation products, reducing the amount of SO2F2 generated in the second-stage tube and making SO2 the main product. Adding H2 with a concentration of 2.5 % can avoid the formation of SO2F2 in the second-stage tube. This study provides guidance for efficient SF6 degradation and product control.

The paper examines the convergence of tax systems in Central and Eastern European countries (CEECs) over the period 1995–2018. Due to the increasing impact of tax competition, we have focused on income taxes, in particular, corporate ones. We have identified the factors that influence the taxation system and trends in income taxation in the CEECs by adapting the hidden Markov model approach. We find that many CEECs have reduced income taxation in the analysis period, mainly by lowering tax rates. Corporate income taxes have also decreased in many CEECs in the same period; however, the reverse has been observed too. Both convergence and divergence have been identified among the CEECs over the period considered. The speed of these processes based on the used variables varied depending on both exogenous and endogenous factors. These factors have been diagnosed as being specific to the periods of tax reforms, i.e., before and after accession to the European Union (EU) and the global financial crisis.