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Sealing selection for pumped storage unit ball valve seals
Get PDFThis paper introduces the structure and working principle of the inlet ball valves for the Phase II units of Guangzhou Pumped Storage Hydropower Plant, as well as the issues of damage to the upstream and downstream sealing rings since the units were put into operation. The causes of the problems are analyzed from several aspects, including the material and structure of the sealing rings and the daily operating conditions. The paper focuses on the research of sealing selection and the effects after the retrofitting
Study on cartilage nano scaffolds with acellular matrix and collagen II
Get PDFObjective: To explore the feasibility of preparing tissue-engineered nano scaffolds using acellular articular cartilage extracellular matrix (CAEM)and Type II collagen (COL II) via electrospinning technology. Methods: Rabbit costal cartilage was decellularized, defatted, and enzymatically digested, followed by drying to obtain CAEM.CAEM and COL II were mixed at a mass ratio of 1:2 and processed into tissue-engineered nano scaffolds using electrospinning technology. The physicochemical properties of the scaffolds were evaluated by measuring their water absorption rate and degradation rate. The cytotoxicity and cell adhesion properties of the scaffolds were assessed using the CCK-8 assay. Results: The fiber diameter of the CAEM-COL II nano scaffolds was (627±165.4) nm, with a water absorption rate of (623.0±27.4) %and a degradation rate of (45.6±5.8) %after 35 days. The CCK-8 assay results indicated that the CAEM-COL II composite scaffolds exhibited good adhesion properties for chondrocytes and favorable biological performance. Conclusion: The CAEM-COL II nano scaffolds provide an excellent microenvironment for the growth and proliferation of chondrocytes and have potential application value in tissue-engineered cartilage reconstruction
Analysis of the main harmful factors in wine and suggestions
Get PDFThis paper analyzes the main hazard factors of wine and the exposure levels. Suggestions for strengthening wine safety and quality are put forward from the aspects of improving the regulatory system and perfecting regulations
Probabilistic analysis of data structures for locality-sensitive hashing functions
Get PDFFor the nearest neighbor search problem in high-dimensional spaces, Locality-Sensitive Hashing (LSH)has shown excellent performance in terms of query cost and disk space utilization. Under the traditional analysis model, LSH is considered a randomized algorithm, with the only uncertainty being the choice of the hash function. In this research, the collision probability obtained under this model is referred to as the hash-function-based collision probability. In this paper, a different analysis model is used to conduct a theoretical analysis of LSH. The motivation for this work is twofold:1) Under the existing analysis model, users must generate random data structures for each query point to achieve the theoretical effect, which is impractical in real applications.2) The performance metric that users are concerned with is the expected collision probability of a random query point in a single data structure. Based on this, this paper derives the collision probability of random point pairs under the Hamming distance for any single hash function. The collision probability derived under this model is referred to as the query-based collision probability. It is also proven that in the Hamming space, the two types of collision probabilities are identical
Impact of NAC on inflammation and nutrition in hemodialysis
Get PDF Objective: To assess whether N-Acetylcysteine (NAC)treatment can improve inflammatory markers and nutritional status in patients undergoing Maintenance Hemodialysis (MHD). Methods: A total of 71 patients who had been on hemodialysis for more than 6 months were selected and randomly divided into an NAC treatment group (NAC 600 mg, twice daily,41 cases) and a control group (no medication,30 cases). Routine clinical data were collected, and a 3-month observation period was initiated. Inflammatory markers, including high-sensitivity C-reactive protein (h s-CRP), interleukin-6(IL-6), interleukin-10(IL-10), tumor necrosis factor (TNF), and homocysteine levels, were measured before and after treatment. Nutritional indicators, such as hemoglobin, serum albumin, and prealbumin levels, were also assessed before and after treatment. Results: After 3 months of NAC treatment in hemodialysis patients, h s-CRP and IL-6 levels significantly decreased compared to pre-treatment levels(both P<0.01).Homocysteine levels also significantly decreased(P<0.05).Hemoglobin, serum albumin, and prealbumin levels significantly increased(P<0.05 and P<0.01,respectively).The reduction in h s-CRP levels in female MHD patients was significantly greater than that in male patients(P<0.01).Conclusion: NAC treatment can reduce inflammatory marker levels and improve nutritional status in hemodialysis patients, thereby benefiting these patients from anti-inflammatory therapy
Thermal enhancement of the oxidation layer of micron-sized aluminum powder and its anti-oxidation performance
Get PDFMicron-sized aluminum powder, with its typical core-shell structure, exhibits oxidation behavior upon slow heating in an oxidative atmosphere that is related to the particle size of the aluminum powder. A particle size-dependent thermal response mechanism for micron-sized aluminum powder is established: a "shell-breaking eruption" thermal response mechanism. The oxide layer is thermally enhanced, and the anti-oxidation reaction behavior mechanism of the enhanced samples is studied. Aluminum powder samples, heated slowly to specific temperatures to obtain changes in the oxide layer structure, are analyzed using a thermal analyzer to compare the slow heating response behavior of aluminum powder before and after the oxidation layer changes. It was found that after thermal enhancement of the aluminum powder oxidation layer, which changed from amorphous to γ-phase and whose thickness increased to twice the original thickness, the slow oxidation process of micron-sized aluminum powder was inhibited, and the aluminum powder was completely deactivated in the slow heating response
Chemical and pharmacological studies of cornus officinalis
Get PDFThis article reviews the chemical components and pharmacological effects of Cornus officinalis Sieb.et Zucc., a traditional Chinese medicinal herb that contains a variety of active ingredients, including iridoid glycosides, flavonoids, organic acids, and tannins. These components endow Cornus officinalis with multiple pharmacological actions, such as neuroprotection, anti-diabetes and its complications, cardioprotection, anti-tumor, and antioxidant effects. In particular, the paper discusses the impact of Cornus officinalis iridoid glycosides on learning and memory ability after cerebral ischemia, as well as their potential mechanisms in the treatment of diabetic nephropathy. Additionally, the application of Cornus officinalis methanol extract in promoting melanin synthesis and its anti-inflammatory, anti-fatigue, antibacterial, anti-osteoporotic, and hepato- and reno-protective effects are also discussed. Although progress has been made in existing research, the specific roles and mechanisms of some newly discovered compounds in Cornus officinalis still require further investigation. This paper aims to provide a reference for in-depth research and clinical application of Cornus officinalis
Stability of Mg IG/GSH combo injection
Get PDFObjective: To investigate the stability of magnesium isoglycyrrhizinate (Mg IG) injection solution when mixed with reduced glutathione (GSH) injection solution at room temperature. Method: High-performance liquid chromatography was used to determine the concentration changes of Mg IG injection solution mixed with GSH injection solution in 5% and 10% glucose solutions. Results: No significant changes in concentration were observed within 0, 0.5, 1, 1.5, 2, and 4 hours after mixing the Mg IG injection solution with the GSH injection solution. Conclusion: Mg IG injection solution can be mixed with GSH injection solution in 5% and 10% glucose solutions and should be used within 4 hours
Discussion on the national food safety standards for sugar products
Get PDFThis paper focuses on the main content of the national food safety standards for sugar products, discusses the changes in the standards, and proposes suggestions. It is beneficial for production enterprises to implement the new standards, regulate industry production management, and promote the healthy development of the industry
Reaction mechanism of micron-sized aluminum powders in O2 and CO2 gradually heated environment
Get PDFThe behavior of aluminum powders in specific oxidized environment is different from each other obviously. Thermal behaviors of micron-sized aluminum powders in different oxygenated and gradually heating environments were discussed in order to find out the oxidation mechanism. Particular attention is paid to the reaction mechanism of oxygen and carbon dioxide atmosphere. Thermogravimetric analysis and related characterization methods are used and the results demonstrated that under the certain condition, reaction process of micron-sized aluminum powders can be divided into four stages. General routes for the oxidation of micron-sized aluminum in general heating system are the same, however, itis different among the extent of reaction at the third stage in different kinds of oxidizing gas atmospheres. Gas phased products were detected during the main reaction stage under carbon dioxide by combining thermal analysis and mass spectrometry which contributes to the rupture of alumina shell and further reaction of micron-sized aluminum powders. Consequently, rapider and more complete reaction process was achieved. The increasing thickness of original alumina shell can restrict the reaction rate of aluminum powders harder at the same time