94 research outputs found
No UV Irradiation Needed! Chemiexcited AIE Dots for Cancer Theranostics
No full textIn this issue of Chem, Liu and coworkers have developed a novel theranostic system based on nanoparticles with aggregation-induced emission characteristics (AIE dots), which emit long-wavelength chemiluminescence (CL) and generate singlet oxygen upon chemiexcitation by H2O2, offering a new strategy for CL image-guided tumor therapy. In this issue of Chem, Liu and coworkers have developed a novel theranostic system based on nanoparticles with aggregation-induced emission characteristics (AIE dots), which emit long-wavelength chemiluminescence (CL) and generate singlet oxygen upon chemiexcitation by H2O2, offering a new strategy for CL image-guided tumor therapy.</p
The Practical Research of Situational Simulation Teaching Method in the Course of Customer Relation Management
No full textFour positive periodic solutions of a discrete time Lotka-Volterra competitive system with harvesting terms
No full textTyt. z nagł.References p. 266-267.Dostępny również w formie drukowanej.ABSTRACT: In this paper, by using Mawhin's continuation theorem of coincidence degree theory, we establish the existence of at least four positive periodic solutions for a discrete time Lotka-Volterra competitive system with harvesting terms. An example is given to illustrate the effectiveness of our results. KEYWORDS: discrete systems, Lotka-Volterra competitive models, coincidence degree, harvesting terms
Effects of Reclamation Projects on Marine Ecological Environment in Tianjin Harbor Industrial Zone
No full textAbstractThe living environment of marine plankton and benthos has been affected by reclamation projects. The investigation of living environment of marine plankton and benthos in Tianjin Harbor Industrial Zone was carried out three times from 2006 to 2008. The results showed that the Shannon-Weaver diversity index of phytoplankton and zooplankton decreased from 3.01 to 1.71 and 1.7 to 0.58, respectively. In addition, the diversity index of Shannon-Weaver of benthos decreased to zero from 1.28. The results showed that reclamation projects would change the living environment of marine organism, decrease the diversity of biology and change the structure of community
Multiple Positive Periodic Solutions of a Discrete Time Delayed Predator–Prey System with Harvesting Terms
No full text
Opuscula Mathematica
No full textIn this paper, by using Mawhin's continuation theorem of coincidence degree theory, we establish the existence of at least four positive periodic solutions for a discrete time Lotka-Volterra competitive system with harvesting terms. An example is given to illustrate the effectiveness of our results.wersja wydawnicz
Euodiae Fructus: a review of botany, application, processing, phytochemistry, quality control, pharmacology, and toxicology
No full textEuodiae Fructus (EF) is the dried and nearly ripe fruit of Euodia rutaecarpa, first recorded in Shen Nong’s Herbal Classic. EF is a versatile Traditional Chinese Medicine (TCM) known for the effects of dispelling colds and alleviating pain, suppressing adverse qi to relieve vomiting, and boosting yang to mitigate diarrhea. However, it should be noted that EF possesses mild toxicity. In TCM prescriptions, EF is employed to treat various ailments, including abdominal pain, diarrhea, chronic non-atrophic gastritis, irritable bowel syndrome, and primary dysmenorrhea. This review collected the literature published before September 2024 on EF. An exhaustive analysis of EF literature was conducted utilizing multiple sources, namely classic TCM books and various scientific databases like Web of Science, PubMed, Elsevier, ACS, ResearchGate, Google Scholar, and Chinese National Knowledge Infrastructure. So far, more than 300 metabolites have been extracted and identified from EF, exhibiting various pharmacological effects, such as cardiovascular protection, gastrointestinal protection, neuroprotection, anti-inflammation, analgesia, anti-tumor, glucose and lipid metabolism regulation, etc. It also exhibits diverse toxicological properties and poses specific toxic risks to the liver, heart, and kidney. Nonetheless, research is scarce regarding the toxicology of EF, especially on its cardiotoxicity and nephrotoxicity. Further in-depth research is necessary to explore the mechanisms underlying EF’s pharmacological and toxicological mechanisms and to develop strategies for quality control and toxicity mitigation. The toxicity of EF can be reduced by processing, but this aspect is rarely discussed, and the quality control needs to be further standardized. Evodiamine, rutaecarpine, and limonin are the effective metabolites of EF and are also one of the causes of EF toxicity. The pharmacological effects of evodiamine and rutaecarpine have been intensely studied, but there are few studies on limonin and other metabolites of EF. Therefore, this paper focuses on the botanical characteristics, traditional applications, processing methods, phytochemistry, quality control, pharmacology, and toxicology of EF. We hope this paper provides a theoretical basis for the future high-value and high-connotation development of EF
Progress in Non-Traditional Processing for Fabricating Superhydrophobic Surfaces
No full textWhen the water droplets are on some superhydrophobic surfaces, the surface only needs to be inclined at a very small angle to make the water droplets roll off. Hence, building a superhydrophobic surface on the material substrate, especially the metal substrate, can effectively alleviate the problems of its inability to resist corrosion and easy icing during use, and it can also give it special functions such as self-cleaning, lubrication, and drag reduction. Therefore, this study reviews and summarizes the development trends in the fabrication of superhydrophobic surface materials by non-traditional processing techniques. First, the principle of the superhydrophobic surfaces fabricated by laser beam machining (LBM) is introduced, and the machining performances of the LBM process, such as femtosecond laser, picosecond laser, and nanosecond laser, for fabricating the surfaces are compared and summarized. Second, the principle and the machining performances of the electrical discharge machining (EDM), for fabricating the superhydrophobic surfaces, are reviewed and compared, respectively. Third, the machining performances to fabricate the superhydrophobic surfaces by the electrochemical machining (ECM), including electrochemical oxidation process and electrochemical reduction process, are reviewed and grouped by materials fabricated. Lastly, other non-traditional machining processes for fabricating superhydrophobic surfaces, such as ultrasonic machining (USM), water jet machining (WJM), and plasma spraying machining (PSM), are compared and summarized. Moreover, the advantage and disadvantage of the above mentioned non-traditional machining processes are discussed. Thereafter, the prospect of non-traditional machining for fabricating the desired superhydrophobic surfaces is proposed
Enhanced performance of catalyst pellets for methane dry reforming by engineering pore network structure
No full textEnhancing the utilization and activity of catalytic materials is crucial in designing catalysts for industrial use. This work achieves these performance enhancements in Rh/Al2O3 catalyzed dry reforming of methane (DRM) at the catalyst pellet level, through engineering catalyst pore network structure. A continuum model, describing the coupled mass, heat transfer and reactions, is developed to optimize the monodisperse and bidisperse catalyst pellets under different temperatures, pressures, and CH4/CO2 ratios. The results show that the preferred pore diameter for the monodisperse catalyst and macropore diameter for the bidisperse catalyst are all 300 nm, above which Knudsen diffusion is not important. Besides, the optimal porosities for the monodisperse and bidisperse catalysts are in the ranges of 0.51–0.59 and 0.61–0.64, which is the result of the trade-off between diffusion and reaction. The optimal bidisperse catalyst can be 56–175% more active but uses 10–18% less catalyst materials when compared to the optimal monodisperse catalyst with the same mesopore size, indicating the great advantage of introducing the optimal macroporosity into mesoporous catalyst pellets for DRM. These results should serve to guide the rational design of industrial catalyst pellets
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