Simulating a conical tuned liquid damper

In recent years, tuned liquid dampers (TLD) have proved a successful control strategy for reducing structural vibrations. The present study focuses on the frustum-conical TLD as an alternative to the traditional cylindrical tank. If compared to the cylindrical reservoir, the cone-shaped TLD allows calibrating its natural frequency through varying liquid depth, which makes it suitable for a semi-active implementation, and attains the same level of performance with a fewer mass, at least for small fluid oscillations. A linear model is presented which can interpret TLD’s behaviour for small excitations. For larger amplitudes, strong nonlinearities occur and the linear model is no longer predictive. Consequently, for a frustum-cone TLD subjected to harmonic excitations, a tuned mass damper (TMD) analogy is established where TMD parameters vary with the excitation amplitude.     

Enhancement of safety and quality of ready-to-cook Asian green mussel using acidic electrolyzed water depuration in combination with sous vide cooking

Emerging technologies were combined to ensure the safety for consumers of Asian green mussel (AGM; Perna viridis). The combination of acidic electrolyzed water (AEW) depuration and sous vide cooking effectively reduced Vibrios while maintaining the quality of mussel. The use of AEW depuration combined with sous vide cooking at 100 °C for 1 min (D/SV-1) provided the yield of mussel meat of 27.22%, maintained the color, and texture properties. It could prevent the oxidation of polyunsaturated fatty acids and caused no changes in patterns of main proteins including paramyosin, actin and tropomyosin. Vibrio parahaemolyticus, V. vulnificus and Shewanella algae in AGM without treatment were 4.12, 3.00 and 3.30 log₁₀ CFU/g, respectively. Those bacterial species were confirmed by MALDI Biotyper® technique. They were potentially inactivated by the selected process. In addition, the next generation sequencing (NGS) based on the 16S rRNA gene revealed a low percentage of V. vulnificus genome (2.72%) and the complete elimination of other naturally existing Vibrios. Overall, AEW depuration of raw mussels, followed by sous vide cooking could be a promising method for the production of safe ready-to-cook Asian green mussels for consumption.Industry relevanceCommon Asian green mussel (AGM; Perna viridis) may represent a risk for public health associated with pathogenic bacteria originating from the aquatic environment. It also deteriorates rapidly within 1–2 days because of its perishable nature, thus losing its market value. To tackle such problems, appropriate pretreatment using acidic electrolyzed water depuration, followed by sous vide cooking under proper conditions could be implemented for safety assurance of ready-to-cook AGM by eliminating both pathogenic and spoilage bacteria. Also, the eating quality could be maintained. As a consequence, the technology developed in the present study could offer an effective solution for ensuring customer safety without compromising eating quality. It could be commercially employed for seafood processing industry, especially for bivalve mollusks, e.g., mussels, scallops, and clams.     

Transforming the fermented fish landscape: Microbiota enable novel,safe, flavorful,and healthy products for modern consumers

Regular consumption of fish promotes sustainable health while reducing negative environmental impacts. Fermentation has long been used for preserving perishable foods, including fish. Fermented fish products are popular consumer foods of historical and cultural significance owing to their abundant essential nutrients and distinct flavor. This review discusses the recent scientific progress on fermented fish, especially the involved flavor formation processes, microbial metabolic activities, and interconnected biochemical pathways (e.g., enzymatic/non-enzymatic reactions associated with lipids, proteins, and their interactions). The multiple roles of fermentation in preservation of fish, development of desirable flavors, and production of health-promoting nutrients and bioactive substances are also discussed. Finally, prospects for further studies on fermented fish are proposed, including the need of monitoring microorganisms, along with the precise control of a fermentation process to transform the traditional fermented fish to novel, flavorful, healthy, and affordable products for modern consumers. Microbial-enabled innovative fermented fish products that consider both flavor and health benefits are expected to become a significant segment in global food markets. The integration of multi-omics technologies, biotechnology-based approaches (including synthetic biology and metabolic engineering) and sensory and consumer sciences, is crucial for technological innovations related to fermented fish. The findings of this review will provide guidance on future development of new or improved fermented fish products through regulating microbial metabolic processes and enzymatic activities.     

鲟鱼头汤对产后缺乳大鼠泌乳功能的促进作用

目的：研究经蒸煮后高压液化熬制鲟鱼头汤的催乳功效。方法：将Wistar母鼠随机分为空白组（生理盐水）、缺乳模型组（溴隐亭）、阳性对照组（乳清蛋白鲈鱼粉）和实验组（鲟鱼头汤）,每组6只,对哺乳期Wistar母鼠进行连续14 d灌胃,考察其体质量和泌乳量变化。通过苏木精伊红染色、免疫组化分析、酶联免疫吸附测定与实时荧光定量聚合酶链式反应等方法测定母鼠乳腺组织形态、相关激素与蛋白表达水平。结果：实验组母鼠乳腺的腺管与腺泡中可以观察到棕黄色阳性显色蛋白分泌物数量增多,乳腺小叶间脂肪结缔组织数量减少,相较于模型组有明显恢复。与模型组相比,实验组母鼠每小时泌乳量、乳腺相对质量以及仔鼠窝重净增率均显著提高（P<0.05）,母鼠血清与乳腺组织中催乳素（prolactin,PRL）、催乳素受体（prolactin receptor,PRLR）、β-酪蛋白（β-casein,β-CN）、α-乳清蛋白（α-lactalbumin,α-LA）水平及乳糖合成酶（lactose synthase,LS）和脂肪酸合成酶（fatty acid synthase,FAS）活力也显著提升（P<0.05）。乳腺...     

国内外食用油脂加工技术发展

近年来,世界油脂加工技术发展非常迅速,预处理和制炼油新技术、新装备、新产品不断出现,正日益受到人们重视。该文主要从提高油/粕质量、降低能耗和废弃物排放、提高生产效率和开发新产品等方面出发,阐述世界油脂加工技术创新发展现状。     

Microbial coupled photocatalytic fuel cell with a double Z-scheme g-C3N4/ZnO/Bi4O5Br2 cathode for the degradation of different organic pollutants

A novel heterostructure of g-C₃N₄/ZnO/Bi₄O₅Br₂ (ZB-3) was designed, and used in the microbial coupled photocatalytic fuel cell (MPFC). It can effectively improve electron utilization efficiency and pollutant degradation using this double Z-scheme heterojunction structure. The current–time (I–t) curves demonstrated that the current density of ZB-3 was higher than that of ZnO, ZnO/Bi₄O₅Br₂ (ZB-1), g-C₃N₄/ZnO (ZB-2). Electrochemical impedance spectroscopy (EIS) indicated ZB-3 possessed the minimum charge-transfer resistance. This MPFC for degrading rhodamine B (RhB) and tetracycline (TC) under different conditions were developed using these materials. Even in the dark condition, MPFC with g-C₃N₄/ZnO/Bi₄O₅Br₂ demonstrated 93% and 82% degradation efficiency for RhB and TC, respectively. Furthermore, the electron transport mechanism of the MPFC and ZB-3 were proposed. It paves the approach for more efficient pollutant degradation via MFC photocatalysis.     

Accurate quaternion radial harmonic Fourier moments for color image reconstruction and object recognition

Pattern Analysis and Applications - Orthogonal moments have become a powerful tool for object representation and image analysis. Radial harmonic Fourier moments (RHFMs) are one of such image...     

Effects of nano-ZrO2 content on microstructure and mechanical properties of GNPs/nano-ZrO2 reinforced Al2O3/Ti(C,N) composite ceramics

Dense Al₂O₃/Ti(C,N) composite ceramics reinforced with GNPs/nano-ZrO₂ were fabricated by hot-press sintering. The effects of nano-ZrO₂ content on the microstructure and mechanical properties of the prepared Al₂O₃/Ti(C,N)/GNPs/ZrO₂ composites were investigated. Results showed that nano-ZrO₂ inclusions refined the matrix grains significantly and resulted in the formation of intra-granular structure. Excellent comprehensive mechanical properties were achieved via addition of combined GNPs and nano-ZrO₂. In particular, the fracture toughness of composites incorporating GNPs (0.4 wt%)/ZrO₂ (1 wt%) exceeded 11 MPa m^1/2, which was increased by more than 86 % compared with that of Al₂O₃/Ti(C,N) ceramic composites without GNPs/ZrO₂. The main toughening mechanisms have been identified as stress-induced phase transformation, crack bridging, deflection and pull-out of GNPs. The toughening effects originated from GNPs were enhanced with the introduction of nano-ZrO₂ because of not only the residual stress resulted from phase transformation but also the formation of intra-granular structure with uneven surface around GNPs.     

Recent advances in black-phosphorus-based materials for electrochemical energy storage

Black phosphorus is a potential candidate material for next-generation energy storage devices and has attracted tremendous interest because of its advantageous structural and electrochemical properties, including its large theoretical capacity, high carrier mobility, and low redox potential. However, its practical applicability has remained low owing to its difficult of preparation, large volume expansion during cycling, and poor electronic conductivity. To this end, there have been significant efforts to improve its synthesis methods and electrochemical performance. A number of black-phosphorus-based composite materials have been developed and investigated. Herein, we provide an up-to-date account of the recent progress made in research on black-phosphorus-based materials for use in rechargeable batteries and supercapacitors. We review the available synthesis methods and basic properties of black phosphorus and discuss its applicability in Li-, Na-, K-, Mg-, Al-ion and Li-S batteries as well as supercapacitors. We also summarize the existing challenges and future opportunities and offer our perspective on the possible directions for future research in this area.