The Zn 3 V 3 O 8 @N-graphene (ZnVO@NG) hybrid was successfully prepared by hydrothermal method as anode material for lithium-ion Batteries (LIBs). The introduced N-graphene (NG) was used as a conductive carbonaceous plat for encapsulating Zn 3 V 3 O 8 (ZnVO) flowers due to good mechanical properties. The ZnVO@NG electrode has better rate performance and higher cyclic stability than most Zn x V y O z -based anode reported before. The reversible discharge capacity of the composite maintains 601 mAh g -1 after 1200 cycles at the rate of 4 A g −1 . The enhanced performance owes to the fast lithium ion/electron transport kinetics, highly surface-controlled pseudocapacitive behavior, and improved interfacial storage of the composite. The density functional theory (DFT) calculations have demonstrated that the interfaces between the ZnVO and graphene sheets provide active sites for the adsorption of Li + ions. In addition, charges redistribution occurring at the interface of the composite confirms the built-in electric field, which could accelerate Li + /electron diffusion.
With the substantial decline in subsidies for new energy automobile, the domestic new energy car industry has undergone "earth-shaking" changes, and the market scale of these new energy automobiles have continued to decline. Even some auto parts suppliers went out of business. At the same time, with the introduction of Tesla in the Chinese market and the continuous expansion of the market size, the pricing strategy of Tesla in the Chinese market, domestic new energy vehicles and traditional fuel vehicles has undergone tremendous changes, so that the market has Get maximum profit. In this context, domestic new energy vehicles may require government departments and related companies to re-evaluate the market status, redefine new development strategies for new energy cars, and promote the healthy and continuous progress of all new energy vehicles. Based on the tripartite representatives in the oligopoly, namely domestic new energy vehicles, Tesla, and Conventional fuel automobile, a tripartite game model has been planned to discuss the tripartite pricing mechanism in this market competition. The research results found that in the future Chinese market, before the technology of domestic new energy vehicles has completely surpassed the technology of the joint venture industry represented by Tesla, it should try to keep the price as low as possible to obtain high profits.
Rational engineering of nanostructured anode materials is important to develop lithium-ion batteries (LIBs). In this study, hierarchical composites of fluoridated carbonaceous GeO2 (F-GeO2@C) with rich oxygen vacancies were prepared by a simple annealing method. It is found that F– ions not only exist in the carbon matrix but also replace O2– of metallic oxides. The abundant introduced oxygen vacancies can provide more active sites and contribute to better electronic conductivity. Moreover, density functional theory (DFT) calculations confirm that F-doping greatly changes the electronic structure of the GeO2 composite, exhibiting interesting metallic behavior. Consequently, the F-GeO2@C anode shows an enhanced initial Coulombic efficiency (ICE) value of 71.6% and delivers excellent rate capability, much higher than most reported GeO2-based anodes. The enhancement of the electrochemical performance for F-GeO2@C is attributed to the hierarchical nanostructure and F-doping by increased reaction kinetics, reversibility, and cycling stability. Thus, such rational fabrication of the composite can motivate other high-performance germanium-based materials in LIBs.
Background Metagenomic next-generation sequencing (mNGS) is a promising technology that allows unbiased pathogen detection and is increasingly being used for clinical diagnoses. However, its application in urinary tract infection (UTI) is still scarce. Methods The medical records of 33 patients with suspected UTI who were admitted to the Second Hospital of Tianjin Medical University from March 2021 to July 2022 and received urine mNGS were retrospectively analyzed. The performance of mNGS and conventional urine culture in diagnosing infection and identifying causative organisms was compared, and the treatment effects were evaluated in terms of changes in urinalyses and urinary symptoms. Results In the detection of bacteria and fungi, mNGS detected at least one pathogen in 29 (87.9%) cases, including 19 (57.6%) with positive mNGS but negative culture results and 10 (30.3%) with both mNGS and culture positive results. The remaining 4 (12.1%) patients were negative by both tests. Overall, mNGS performed better than culture (87.9% vs. 30.3%, P < 0.001). Within the 10 double-positive patients, mNGS matched culture results exactly in 5 cases, partially in 4 cases, and not at all in 1 case. In addition, mNGS detected a broader pathogen spectrum, detecting 26 species compared to only 5 species found in culture. The most abundant bacteria detected by mNGS was Escherichia coli , detected in 9 (27.2%) patients. All anaerobic bacteria, Mycobacterium Tuberculosis and all mixed pathogens were detected by mNGS. The final clinical diagnosis of UTI was made in 25 cases, and the sensitivity of mNGS was significantly higher than culture (100.0% vs 40.0%; P < 0.001) when using the diagnosis as a reference standard; the positive predictive value, negative predictive value and specificity were 86.2%, 100% and 50.0%, respectively. Importantly, targeted antibiotic therapy based on mNGS resulted in significant improvement in urinalyses and urinary symptoms in patients. Conclusions mNGS is a technology that has shown clear advantages over culture, particularly in the context of mixed infections and UTIs that are difficult to diagnose and treat. It helps to improve the detection of pathogens, guide changes in treatment strategies, and is an effective complement to urine culture.
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