Near-isothermal hydrothermal carbonization of glucose: Estimating continuous reactor performance from batch kinetics.

Due to the fact that gas drainage carried out in high-gas mines to address gas issues may exacerbate the spontaneous combustion of coal in goaf areas, and fires may disrupt normal production, it is necessary to adopt appropriate fire prevention and suppression measures. This paper takes Yangquan No. 5 Mine as the background and investigates the influence of the inert gas injection port depth and air leakage sealing length on the spontaneous combustion hazard zone under gas drainage conditions by combining experiments and simulations. The reasons for the influence were explained from the perspectives of the flow field and concentration flux field. The results show that the best effect is achieved when inert gas is injected at the junction of the oxidation zone and the heat dissipation zone, as the inert gas coverage is most balanced at this point. The relationship between the distance of air leakage sealing and the area of the oxidation zone has been determined. Blindly increasing the distance of air leakage sealing will be counterproductive. Starting from the intake side, the optimal sealing length is the average of the horizontal distances from the low-level suction roadway and the high-level suction roadway to the intake airflow roadway, and the oxidation zone area can be reduced by up to 45%. This research outcome has guiding significance for the reasonable determination of on-site fire prevention process parameters.

Regenerative therapy involving transplanted bone marrow mononuclear cells (BM-MNCs) and hematopoietic stem cells (HSCs) is markedly effective against many diseases. However, manual MNC separation requires skilled labor and cell-processing centers. Thus, efforts have been targeted toward fractionating MNCs using cell separators. A double-blind, placebo-controlled study of myocardial infarction using BM-MNCs separated by an existing device was conducted, and no therapeutic effects were found. The development of a cell separator to replace manual techniques would significantly contribute to the widespread application of BM-MNC therapy. Therefore, we developed a BM-MNC separation device that can reproduce manual separation. We changed the shape of the injection port on the centrifuge container and determined its circuit to improve the performance of HSC separation and remove degenerative red blood cells (RBCs). We assessed HSC recovery and degenerative RBC removal rates using fluorescence-activated cell sorting. Additionally, we evaluated the therapeutic effects of cells separated using our device in mouse models of stroke. The HSC recovery and degenerative RBC removal rates using the device were comparable to those obtained using manual separation. We also confirmed the therapeutic effects of BM-MNCs separated by the device in the models. The new automated device could replace manual cell separation and render cell-based therapy using BM-MNC feasible without laborious manual tasks at dedicated cell-processing centers.

Lysergic acid diethylamide (LSD) and analogs are psychedelic drugs commonly submitted to forensic chemistry laboratories. These drugs are often present on items of evidence at low concentrations, requiring sensitive analyses to positively identify their presence. The injection port of a gas chromatograph (GC) plays an important role in vaporizing and transferring substances to the column for separation and subsequent detection. The consumables in the inlet, specifically the liner, can influence the abundance and chromatography of compounds being analyzed. Twelve liners with varying geometries, packing materials, and deactivation chemistries were assessed by analyzing a mixture of eight LSD-related compounds and comparing the average peak areas. Liners containing packing materials yielded significantly higher peak areas as compared to those without. The geometry of the liner played a smaller role and affected results only with one deactivation when glass wool was not present. Base deactivation improved peak area when compared to standard and Topaz deactivation in straight liners with packing. Authentic samples were analyzed on liners with varying deactivation chemistries to determine the effect over a run of seven replicates of 10 street samples (70 sample injections). Peak area with base-deactivated liners and liners with standard deactivation remained consistent over time, whereas the liner with Topaz deactivation decreased in peak area 52-68% after the initial injection and demonstrated a decrease in peak area of 30-54% from the first injection to the final injection.

An efficient large-eddy simulation code has been developed to simulate combustion instabilities in a hydrogen–oxygen (H2-O2) rocket engine combustion chamber with multiple injectors. The code uses multiblock structured hexahedral grids with a patched-grid interface between the combustion chamber and the injection ports, which allowed improved accuracy with a relatively small number of total grid points compared to the use of unstructured tetrahedral or prism grids. Both the flow in the fuel/oxygen injection system and the combustion chamber are simulated and directly coupled through the patched interface method. A half model of an experimental rocket combustor chamber with 42 hydrogen–oxygen injection ports is sufficient. A one-step finite-rate chemistry is employed to capture the dynamics of chemical reaction. Modal analysis methods based on fast Fourier transform and dynamic mode decomposition are used to analyze the computed unsteady pressure field. Primary acoustic waves, including three longitudinal modes, two standing tangential modes, and one radial mode in the combustion chamber, are identified without any triggering. Also, an injection-coupled chugging frequency is clearly identified. The first tangential mode is identified as the dominant self-excited instability mode, in agreement with the experimental data for the combustor. The spatial distribution of the mode shapes in the combustion chamber is explained, accounting for sound speed variations in the axial direction. Analysis of the interaction between the longitudinal wave system within the injection ports and those in the combustion chamber reveals an important feature of the combustion instability. When a natural frequency of the combustion chamber occurs as a harmonic of that of the injection ports, waves from the chamber travel into the injection ports, inducing resonant oscillations within the ports, which in turn causes oscillations of the heat release rate in the reaction zone downstream of the injection plate. Since this fluctuation of heat release is in sync with the chamber pressure oscillations, it can heighten the Rayleigh index, strengthening the combustion instability. This coupling mechanism has not been previously analyzed mathematically, but it is found to agree with existing experimental and computational data and may provide guidance in practical design to avoid rocket engine combustion instability.

Hydrophobic deep eutectic solvent-based ferrofluid for the multi-residue analysis of pyrethroid insecticides in agricultural products: Facile pretreatment and MS-friendly detection.

Evaluation of co-foaming agents for enhanced removal of per-and polyfluoroalkyl substances (PFAS) by foam fractionation.

Evidence for optimal location of subpalpebral lavage (SPL) systems is lacking. To compare the rate and types of complications with SPL systems located in central upper- compared with medial lower-eyelid in hospitalised patients. Prospective, randomised treatment trial. Horses admitted for ophthalmic treatment using an SPL system from February 2015 to January 2024 were included if ocular pathology did not necessitate SPL system placement in a specific location. Coin toss was used to determine location. SPL systems were monitored at least daily, and complications were defined as major (displacement of footplate from the fornix ± corneal ulceration; loss of footplate; eyelid infection/abscess formation) or minor (loss of suture/tape; palpebral swelling; leakage or tube rupture; loss of injection port; subcutaneous swelling/abscess at suture site). Data were analysed using logistic regression. Seventy-three SPL systems in 68 horses were included, with 38 (52%) located in the upper and 35 (48%) in the lower eyelid, for a median (IQR) duration of 13 (8-16) days. Sixty-nine complications (37 (54%) in upper and 32 (46%) in lower SPL systems) occurred in 44/73 (60%) of all SPL systems. Major complications occurred with 2 lower (2/69; 3%) and 10 upper SPL systems (10/69;14%). The most common major complication was displacement of the lavage footplate from the conjunctival fornix (7/69; 10%). The most common minor complication was loss of suture or butterfly tape (21/69; 30%). Treatment with chloramphenicol (OR = 0.3; 95% CI: 0.09-0.8; p = 0.02) or cross-linked modified hyaluronic acid (OR = 3.9; 95% CI: 1.2-13.3; p = 0.03) was associated with any complication on multivariable analysis. Multivariable analysis showed that upper systems were 5.1 (95% CI: 1.0-25.7; p = 0.05) more likely to have a major complication than lower SPL systems. Small study size. SPL system location had no effect on all complications, but major complications were more common in those placed in the upper lid.

The EUROfusion Consortium is conducting a preconceptual design and feasibility study of a volumetric neutron source (VNS) facility to address perceived needs in the development of integrated breeding blanket and fuel cycle testing and qualification, with aim to mitigate risks stemming from the current low reliability and technical maturity of present design concepts for a DEMO fusion reactor. The main requirements driving the selection of key physics and technical concepts have been identified to cope with a construction and operation schedule consistent with the DEMO design activities. The VNS needs to provide a steady-state plasma operation based on reliable beam-target fusion plasmas with a fusion power at 30 MW, generating a peak neutron wall load of at least 0.5 MW/m2 up to neutron fluences of 30 to 50 displacements per atom. Neutronics assessments are requested to provide essential nuclear loads and shielding performances of this device. To support the technical feasibility of the VNS tokamak, a series of analyses were conducted in support of the architecture and system design concept. The preconceptual design of the VNS was based on ITER-like shielding structures at the inboard side (ca. 70 cm radial depth) and enhanced outboard side shielding (about a 120-cm radial depth). According to the assumed port configuration and toroidal segmentation of the VNS tokamak, a torus sector model of 60 deg has been generated from available computer-aided design models and converted to MCNP geometry descriptions. The primary objectives of the initial nuclear analyses and scoping assessments were the radial build on the inboard side to protect, specifically, the toroidal field coils and the shielding environment around the neutral beam injector (NBI) port duct, as well the divertor and lower ports, which are critical areas for ex-vessel shielding objectives. It could be demonstrated that the protection from a radial build adopting tungsten-based shields is adequate, whereas additional measures on shielding and integration of NBI ports and lower ports are required.

This study investigates fire prevention and control in inclined coal seams prone to spontaneous combustion, using the 12020 working face of a Henan mine as a case study. The porosity distribution and spontaneous combustion hazard zones in the goaf were analyzed through on-site observation, theoretical analysis, and numerical simulation. A segmented non-parallel progressive nitrogen injection technique was evaluated and optimized. Results indicate that the non-uniform collapse of the roof rock layer causes the oxidation zone on the return airway side (60.9 m) to extend further than on the intake side (33.6 m), with high-temperature zones concentrated near the return airway and central goaf. Numerical simulations compared nitrogen injection locations and volumes for both monomer and segmented methods, assessing the oxidation zone area, oxygen concentration, and temperature distribution. The segmented non-parallel progressive nitrogen injection method was found to be optimal, with two injection ports: one at the intake airway (35 m, 800 m3/h) and another 20 m below the return airway (80 m, 500 m3/h). This configuration maximizes the superposition effect of nitrogen injection on both sides of the goaf, reducing the oxidation zone by 2831 m2 (71.5%) and lowering the high-temperature point from 38.8 to 32.2 °C. It also rapidly decreases CO concentration to a safe level, effectively preventing spontaneous combustion in the goaf.

Numerical study of the effect of flow patterns on contaminant removal in a hospital ward with symmetrical and asymmetrical inlet port arrangements.

Optimization study of CO₂ inerting parameters in goaf based on coal sample oxidation characteristics

Propolis Volatile Components (PVCs) are key for the pleasant aroma of this bee product but also have demonstrated several biological activities. In Uruguay, only one report of PVCs has been published, without any specification of the origin and the production conditions.In the present work, we analysed samples from an organic apiary in Rocha Province (eastern Uruguay) collected according to the Uruguayan official recommendations. Headspace sampling of 0.03 g of ground propolis was conducted at 50°C for 30 minutes using two different SPME sorbents (1: DVB/PDMS/Carboxen; 2: Polyacrylate). The extracted PVCs were then directly desorbed in the injector port of a GC-MS instrument. Two stationary phases (Rxi-5MS and Stabilwax-MS) were selected for conventional analysis, using optimized oven programs. Identification of PVCs was carried out by comparing mass spectra with commercial libraries and calculating linear retention indices (LRIs), using a C8-C20 alkane solution. Additionally, separation of chiral monoterpenes was achieved via eGC-MS (enantioselective) with an Rt-βDEXsm column (stationary phase composed of a modified β-cyclodextrin as chiral selector). Over 100 PVCs were detected, predominantly phenylpropanoids, benzenoids and terpenic compounds. Some key PVCs identified include α-pinene, benzyl alcohol, terpinen-4-ol, o-guaiacol, benzyl benzoate, spathulenol and β-selinene. The detection of trans-nerolidol suggests (at least in part) Baccharis dracunculifolia (Asteraceae) as the botanical origin of the samples, like Brazilian Green Propolis. Further studies on the chiral patterns of selected PVCs could enhance quality control, define potential markers and support origin certification of this product in Uruguay.

Understanding how immunometabolism impacts the function, differentiation, and fate of lymphocytes has garnered significant interest and attention. Lymphocyte biology has been explored using bioenergetic analysis and has now become a critically import tool in the field. Thus, we sought to optimize a bioenergetic analysis assay that can be adapted with pretreatments and acute injection for receptor stimulations. Here, we evaluated CD8 T cell ex vivo metabolism using the Cell Mito Stress Test to assess rates of oxygen consumption and extracellular acidification in naïve and effector CD8 T cells. Antigen-specific effector CD8 T cells were derived via ex vivo stimulation, and naïve CD8 T cells harvested from splenocytes and isolated with magnetic bead column separation. Pretreatments are performed in microplates and we detail how to prepare sensor cartridges. We show how injection ports can loaded with drugs to indirectly measure metabolic capacities and with metabolic modulators, this protocol can be used to study specific enzyme activity. T-cell receptor stimulations can be studied in real time with acute injection and stimulation with anti-CD3/CD28 using the injection ports. Instrument analyzers are used for measurements and data collection and data visualization is done with software programs to interpret cellular metabolism. This strategy produces an extensive amount of data on immune cell biology and mitochondrial bioenergetics allowing researchers to customize the protocol in numerous ways to explore CD8 T cell metabolism.

The hydrocarbon liquid rocket engine working environment is harsh; the thrust chamber needs to withstand high temperatures and a high-pressure working environment, and the thrust chamber wall material is difficult to bear, so it is necessary to design the cooling structure to reduce the gas damage to the chamber wall. Liquid film cooling is a common cooling method for hydrocarbon rocket engines, and numerical simulation is an important method for studying liquid film cooling. Most of the liquid film cooling numerical simulation is for a fixed model. This paper proposes a liquid film cooling numerical calculation method for a variable-configuration hydrocarbon liquid rocket engine, based on the secondary development of Fluent software(ANSYS Fluent 2022) to form a high-energy hydrocarbon liquid rocket engine design software, which can be realized on the Qt platform. The visualization interface can be for different engine injection port locations, numbers, angles, mass flow rates, and other parameters, to calculate and improve design efficiency and reduce operating difficulty.

Owing to extremely low concentrations and dynamic changes, it is difficult to detect and trace the retronasal volatile organic compounds (VOCs) generated during the consumption of alcoholic beverages. We developed a direct sampling gas chromatography-ion mobility spectrometry (GC-IMS) method to identify the dynamic VOCs after drinking Huangjiu-a fermented alcoholic beverages. The optimal procedure was obtained: take a sip of 10 mL Huangjiu, holding it in mouth for 10 s and then swallow, and the VOCs in one nasal expiration were collected with gas sampling bag and transferred directly to the injection port of GC-IMS. The repeatability was satisfactory (RSD < 5%). Twenty-two VOCs were detected in Huangjiu, with esters and alcohols being dominant, which were divided into five distinct release behavior groups. Their release was found significantly inhibited by saliva. Overall, this new method offers a technical approach to understanding and assessing the characteristics of retronasal aroma in alcoholic beverages.

Abstract Utilizing the momentum theorem, flow pattern analysis, and the drift flux method, a comprehensive theoretical model for air lifting in gas-liquid-solid transportation within deep-sea mining has been developed. The results indicate that as the gas mass flow rates increase, there is an initial rapid rise in the particle mass flow rates, followed by stabilization. Concurrently, lifting efficiency shows an initial increase before declining, peaking at lower gas mass flow rates. Increasing the riser diameter or immersion ratio, as well as deepening the air injection port, significantly enhances both the particle mass flow rates and lifting efficiency, while expanding the range of highly efficient gas mass flow rates to improve system lifting capacity. This suggests that under high immersion rates or with larger injection port depths, an air lifting system can utilize a higher gas mass flow rate to enhance production capacity. This study not only provides effective theoretical support for air lifting systems in deep-sea mining but also introduces novel concepts and avenues for further research and engineering practice in related fields.

The purpose of this study was to establish a model of uterine carcinoma in female laboratory rats by transplanting Guerin carcinoma directly into the uterine horn. Material and Methods. Fifteen nonlinear white laboratory rats weighing 250 ± 25 g served as the subjects of surgical intervention. all operative interventions were performed under xylazine-zoletil anesthesia. Female white laboratory rats were laparotomized under aseptic conditions using anesthesia. the incision length was 2 cm, and a tumor suspension containing 2.5-3.5×106 cells was injected into the lumen of the right uterine horn using an intravenous catheter with a 22G injection port (0.9 × 25 mm). tumor cells were counted using the ADAMIILS cell analyzer (Nano Entek, Korea). the tumor progression was monitored for 21 days. after euthanizing the animals under ether anesthesia, median longitudinal histological sections, 5–7 μm thick, were made from the tumor node and stained with hematoxylin-eosin and Van-Gizon using standard techniques. Results. Following the transplantation of Guerin’s carcinoma cell suspension, a tumor node of approximately 25 mm in diameter was identified macroscopically in the region of the inferior aspect of the right uterine horn. additionally, the presence of haemorrhagic effusion was documented in the abdominal cavity and tumor screenings. at light microscopy, areas of neutrophilic infiltration, significant narrowing of the lumen of the uterine horn with signs of involution, and prismatic epithelium of papillary structures were observed. the tumor cell features characteristic of Guerin’s carcinoma are preserved in the tumor node induced in the uterus, with a cytoplasmic-nuclear ratio that remains close to 1:1. the shapes of the nuclei vary, but the irregular ovoid shape remains dominant, and pathological mitotic figures are observed. the tumor stroma includes cytoplasmic branched connections connecting the tumor conglomeration. Conclusion. therefore, according to the morphological description, the presented experimental model demonstrates the possibility of intrauterine growth of Guerin’s carcinoma in animals and is most similar to the localization of the tumor focus in patients with gynecological cancer.

Non-Contact Time-Varying Current Reconstruction for Electromagnetic Immunity Diagnosis in Electric Vehicle Module Injection Port Testing

Objectives : This study developed a simple and automated analytical method using headspace-SPME (solid phase microextraction) and GC (gas chromatography)-MSD (mass selective detector) to simultaneously analyze ten odorous compounds (dimethyl trisulfide (DMTS), 3-hexenylacetate (HA), 2-isopropyl-3-methoxypyrazine (IPMP), 2-methylbenzofuran (MBF), 2-isobutyl-3-methoxypyrazine (IBMP), β-cyclocitral (CC), trans-2-decenal (DCNL), 2-trans-4-trans-decadienal (DENL) 2,4,6-trichloroanisole (TCA) 및 β-ionone (ION)), evaluating their distribution characteristics throughout the Nakdong River basin.Methods : To optimize the extraction efficiency of the headspace-SPME method for ten odorous compounds, we evaluated various SPME fiber materials, extraction temperatures, extraction times, desorption temperatures, desorption times and salt (NaCl) dosages. Additionally, using the optimized headspace-SPME, we investigated the detection concentrations at ten main stream sites and six tributary sites in the Nakdong River basin.Results and Discussion : The most suitable SPME fiber material for the pretreatment of ten odorous compounds was CAR/PDMS/DVB. The optimal SPME extraction temperature and time were 75°C and 60 minutes, respectively, and the optimal desorption temperature and time at the GC injection port were 250°C and 3 minutes. Additionally, the optimal salt (NaCl) dosage for a 10 mL water sample was 2 g. Using the optimized headspace-SPME pretreatment method for GC-MSD analysis, the detection limits and quantification limits for the ten odorous compounds ranged from 2 to 10 ng/L and 5 to 25 ng/L, respectively, with HA exhibiting the highest detection and quantification limits. The evaluation of the distribution characteristics of odorous compounds throughout the Nakdong River basin revealed that only three compounds—DMTS, CC and ION—were detected. Among these, DMTS was found at the highest concentration of 115.5 ng/L in the tributary Jincheon-cheon, while CC was detected at the highest concentration of 30.6 ng/L in the main river at Goryeong. In the case of the Nakdong River basin, there was no contamination by odorous compounds in the upstream area. In the middle reach, influenced by effluent of wastewater treatment plants, the detection concentrations of three odorous compounds increased, but they showed a decreasing trend as they moved downstream.Conclusion : Since odorous compounds can lead to distrust in water quality even at extremely low concentrations in the ng/L range in tap water, regular monitoring of water sources is necessary during algal bloom season, including the dry season. Furthermore, continuous research is needed on various odorous compounds beyond the 10 odorous compounds in this study, including the optimization of analytical methods and the detection characteristics in water sources.