Powder Inhibition of Gas Explosion Research Progress and Development Trend.

The domestic and international research status was reviewed, analyzing the explosion characteristics of inert powders, active powders, and composite powder explosion suppressants from the perspectives of maximum explosion pressure and flame propagation properties. The explosion suppression mechanisms of powder suppressants were also summarized. Analysis found that the inert powder is mainly from the physical aspects of heat absorption, oxygen dilution, and the formation of physical barriers to inhibit gas explosions; the active powder is mainly from the chemical aspects of the capture of free radicals to interrupt the explosion chain reaction inhibition of gas explosions; the composite powder is through the physical-chemical aspects of synergistic inhibition of gas explosions.

Study on the Characteristics and Mechanisms of KHCO Powder in Suppressing Methane Explosions in the Pipeline Network.

Methane is a widely used form of clean energy in daily production and life. To prevent the potential threat of explosions caused by methane leakage during transportation, potassium bicarbonate (KHCO) powder was selected for methane explosion suppression experiments based on an independently designed and constructed explosion pipeline network experimental platform. Explosion propagation and destruction inhibition performance were employed as parameters to characterize explosion suppression performance.

Comparative Effects of Two Acupuncture Protocols in the Management of Chronic Insomnia: A Randomized Controlled Trial.

Background: Chronic Insomnia Disorder (CID) significantly impairs both sleep quality and daytime functioning. However, current treatments have limited efficacy in improving daytime function and are often associated with side effects. This highlights the urgent need for effective and safe therapeutic approaches that can target both nocturnal and daytime symptoms.

Efficacy of acupuncture at "Ghost Points" in the treatment for chronic insomnia with depressive symptoms: A randomized controlled trial.

Background: Chronic insomnia is a pervasive health issue, particularly when accompanied by depressive symptoms. Limitations of conventional treatments have prompted us to explore new therapeutic approaches. This study evaluated the effect of acupuncture at "Ghost Points" for treating insomnia with depressive symptoms.

Study on combustion reaction products and free radicals of aliphatic hydrocarbon functional groups in coal based on ML potential MD.

The Gas-phase products generated by aliphatic hydrocarbon functional groups during the spontaneous combustion of coal represent a significant source of environmental pollution. A primary focus of contemporary research is the investigation of their microscopic reaction pathways and the dynamics of free radical transformations. This study examines the combustion and pyrolysis reaction mechanisms of three distinct aliphatic hydrocarbon functional groups utilising the Machine Learning Potential Molecular Dynamics (ML potential MD) method, with validation conducted through thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR) and in-situ FTIR experiments.

Discovery of New Antifungal Polyketides Cladrioides A-N against Phytopathogenic Fungi from LD-8.

During the search for natural fungicides, 14 new australifungin analogues cladrioides A-S (-) and two known ones ( and ) were obtained from LD-8. Their structures were elucidated by comprehensive analysis of NMR and HRESIMS data, as well as ECD calculations. Compounds and possess a novel 6/6/5-fused tricyclic scaffold.

Antiviral Chlorinated Drimane Meroterpenoids from the Fungus LD-7 and Their Biosynthetic Pathway.

Ten new drimane meroterpenoids talarines A-J (-), along with six known analogues , were isolated from desert soil-derived fungus LD-7. Their 2D structures were elucidated by comprehensive interpretation of NMR and HRESIMS data. Electronic circular dichroism calculation was used to establish their absolute configurations.

Effect of Acupuncture on Postoperative Pain in Patients after Laparoscopic Cholecystectomy: A Randomized Clinical Trial.

Objective: To evaluate the efficacy and safety of acupuncture compared to that of parecoxib sodium on postoperative pain (POP), postoperative nausea and vomiting (PONV), and the Bruggemann Comfort Scale (BCS) in patients following laparoscopic cholecystectomy (LC).

Methods: Eligible patients admitted to the hospital for LC were randomly allocated to either acupuncture or control groups in a 1 : 1 ratio. The subjects in the acupuncture group received acupuncture while those in the control group were injected by parecoxib sodium at their requests.

Molecular structure characterization analysis and molecular model construction of anthracite.

Coal is the largest non-renewable energy as well as an important basic energy and industrial raw material. Thus, correctly understanding the molecular structure characteristics of coal has important theoretical value for realizing carbon neutralization. In this work, we clarified the molecular structure characteristics of anthracite, where the organic matter in anthracite was characterized and analyzed by industrial/elemental analysis, FTIR, XPS, XRD and solid 13C NMR.

Study on Methane Explosion Suppression in Diagonal Pipe Networks Using a Fine Water Mist Containing KCl and an Inert Gas.

To explore an effective approach for suppressing methane explosions in actual pipe networks, we used a custom-made diagonal pipe network experimental system to assess the suppression of methane explosions using a fine water mist containing KCl and an inert gas. The shock wave pressure, flame wave velocity, and flame wave temperature under different suppression conditions were compared to characterize the effects of explosion suppression under different working conditions, and the mechanism of explosion suppression was analyzed. The results showed that under single-factor explosion suppression conditions the optimal explosion suppression results were achieved when the volume fraction of N was 25%, the volume fraction of CO was 20%, and the concentration of KCl was 7%.

Study on the Effect of KHCO Particle Size and Powder Spraying Pressure on the Methane Explosion Suppression Characteristics of Pipe Networks.

To achieve the best explosion suppression effect of an active powder spraying system, the KHCO powder suppression test for a 9.5% methane-air premixed methane explosion was studied based on an independent test platform consisting of a pipe network. The suppression effect of KHCO powder particle size and powder spraying pressure on the methane explosion shock wave pressure, flame wave velocity, and flame wave temperature were studied, and the explosion suppression mechanism was analyzed.

Research on smoke control for an underground mall fire, based on smoke barrier and mechanical smoke exhaust system.

This study examines smoke spread in an underground mall fire under the composite smoke control mode of a smoke barrier and a mechanical smoke exhaust system. The objective is to optimize the selection of smoke containment and exhaust methods in an underground mall in Fuxin City, China. A Fire Dynamics Simulator was used for numerical simulation to investigate the effects of the sagging height and spacing of smoke barriers on smoke containment, as well as the effects of size, number, and arrangement of smoke vents in the mechanical smoke exhaust system on the effectiveness of smoke exhaust.

Study on emergency escape route planning under fire accidents in the Burtai coal mine.

Developing an effective safety emergency plan for coal mines is crucial to prevent and reduce accidents, as well as improve the emergency response capability. This paper identifies and analyzes potential accident hazards in the Burtai coal mine through a comprehensive and practical investigation of risk factors. Based on a mathematical model of a mine fire disaster relief algorithm, the MATLAB software is used to conduct numerical simulations of the dynamic spreading process of the fire smoke.

Experimental study on the explosion characteristics of hydrogen-methane premixed gas in complex pipe networks.

To explore the overpressure evolution laws and flame propagation characteristics in complex pipe networks after the addition of hydrogen to methane, we experimentally studied the explosive pressure wave and flame wave propagation laws for three different premixed gas mixtures with hydrogen-methane concentrations of 0, 10% and 20% when the equivalence ratio was 1. Experimental results indicate that the maximum explosion overpressure of the premixed gas increases with increasing distance from the explosion source, and it shows a gradually decreasing trend. In the complex pipe network, an overpressure zone is formed in the B-E-H and D-E sections of the network.

Inhibition of lncRNA plays a protective role in hypoxia-ischemia-reoxygenation-induced myocardial injury by regulating miR-335 and RASA1 expression.

Long non‑coding (lnc)RNAs serve a role in a number of diseases, including different types of cancer and acute myocardial infarction. The aim of the present study was to investigate the protective role of lncRNA small nucleolar RNA host gene 8 in hypoxia‑ischemia‑reoxygenation (HI/R)‑induced myocardial injury and its potential mechanism of action. Cell viability, proliferation, creatine kinase myocardial band, cell apoptosis and protein expression levels were determined by Cell Counting Kit‑8 assay, EdU assay, ELISA, flow cytometry and western blotting, respectively.

Er(3)/Yb(3)-codoped phosphate glass for short-length high-gain fiber lasers and amplifiers.

Er(3)/Yb(3)-codoped phosphate glass with compositions of (78.2-x)P(2)O(5)-14Al(2)O(3)-5Li(2)O-1K(2)O-1.8Yb(2)O(3)-xEr(2)O(3)(x=0.

The role of silver and gold nanoparticles in enhancing luminescence of europium complexes.

The influence of 12 nm spherical silver nanoparticles (AgNPs) and 20 nm spherical gold nanoparticles (AuNPs) on the luminescence of europium complex Eu(TTFA)3 were studied. When 350 nm is chosen as the incident light, the maximum enhancement factor of the complexes mixed with AgNPs is about 2.5 at the wavelength of 612 nm.

Photoluminescence properties of Tm3+/Tb3+/Eu3+ tri-doped phosphate glass and glass ceramics for white-light-emitting diodes.

Tm(3+)/Tb(3+)/Eu(3+) tri-doped phosphate glasses are synthesized to explore new white-light-emitting materials. Under 365 nm excitation, the CIE coordinates (x=0.339, y=0.

De novo design of N-(pyridin-4-ylmethyl)aniline derivatives as KDR inhibitors: 3D-QSAR, molecular fragment replacement, protein-ligand interaction fingerprint, and ADMET prediction.

Vascular endothelial growth factor (VEGF) and its receptor tyrosine kinase VEGFR-2 or kinase insert domain receptor (KDR) have been identified as promising targets for novel anticancer agents. To achieve new potent inhibitors of KDR, we conducted molecular fragment replacement (MFR) studies for the understanding of 3D-QSAR modeling and the docking investigation of arylphthalazines and 2-((1H-Azol-1-yl)methyl)-N-arylbenzamides-based KDR inhibitors. Two favorable 3D-QSAR models (CoMFA with q(2), 0.

Pharmacophore modeling and virtual screening studies to identify new c-Met inhibitors.

Mesenchymal epithelial transition factor (c-Met) is an attractive target for cancer therapy. Three-dimensional pharmacophore hypotheses were built based on a set of known structurally diverse c-Met inhibitors. The best pharmacophore model, which identified inhibitors with an associated correlation coefficient of 0.