The article believes that the circulation efficiency of agricultural products, especially the efficiency of the circulation system of agricultural products, is the ratio of circulation output to circulation cost in the process of circulation of agricultural products. The circulation efficiency of agricultural products cannot be measured by a single indicator. The article argues that the PCA-DEA combination evaluation model can be constructed by using the market integration degree, market concentration degree, technical efficiency, consumer satisfaction, circulation spread, transaction costs, and using the principal component weight constraint cone to objectively assign DEA values. At the same time, it is necessary to develop a circulation mode of agricultural products led by leading enterprises, promote the intensive processing of agricultural products, and improve the circulation efficiency.
This paper aims to study the impact of the digital transformation of the circulation industry on the efficiency of agricultural product circulation. Through literature review and empirical analysis, this paper finds that digital transformation can promote the improvement of the circulation efficiency of agricultural products, mainly in the aspects of informatization, logistics and intelligence. Digital transformation can improve the information transparency of agricultural products, reduce circulation costs, increase circulation speed, and shorten the length of the supply chain. Digital transformation can also improve the transportation efficiency of agricultural products through the application of logistics technology, and further improve the circulation efficiency. Digital transformation can also improve the quality and safety of agricultural products and increase consumers' trust in agricultural products through the application of intelligent technologies. This paper proposes the impact mechanism of digital transformation on the circulation efficiency of agricultural products, and puts forward policy recommendations to promote the application of digital transformation in the circulation of agricultural products.
Lithium-sulfur batteries (LSBs) have attracted wide attention due to their high energy density, abundant raw material reserves and environmental friendliness. However, the shuttle effect of polysulfides, the large volume expansion during the reaction and the poor electron conductivity of sulfur greatly limit their practical development. In this work, a ZIF-8 derived flower-like two-dimensional (2D) porous carbon nanosheet/sulfur composite (ZCN-SnS2-S) combined with SnS2 nanoparticles is designed as the cathode for LSBs. The unique 2D flower-shaped porous structure not only effectively alleviates the volume expansion during the reaction process, but also provides a fast channel for Li + and electron transport. The presence of heteroatom N further promotes the adsorption of polysulfide. In particular, the polar SnS2 enhances the chemical adsorption on polysulfides, resulting in excellent electrochemical performance. The ZCN-SnS2-S electrode exhibits the high reversible specific capacity of 948 mAh• g -1 after 100 cycles at 0.2C (1C=1675 mA• g -第*期 王新玲, 等: SnS2/ZIF-8 衍生二维多孔氮掺杂碳纳米片复合材料的锂硫电池性能研究 2 1 ), demonstrating the capacity retention rate of 83.7 %. Even at a high current density of 2C for 300 cycles, it still has a reversible specific capacity of 546 mAh• g -1 .
Background: Non-small cell lung cancer (NSCLC) has improved greatly in recent years. However, non-invasive early screening for carcinogenesis and progression are unclearly. The aim of this study was to explore the predictive value of peripheral blood immune cells in untreated NSCLC patients. Methods: We retrospectively enrolled 305 untreated NSCLC patients and 132 healthy participators from February 2016 to August 2019. Immune cells levels were performed by flow cytometry and blood routine tests. Results: NSCLC patients had lower levels of T lymphocytes, NK cells, CD8+ T cells, naïve CD4+/ CD4+, naïve CD4+ T cells and higher levels of CD4+ T cells, memory CD4+/CD4+, memory CD4+ T cells, CD4+CD28+/CD4+, CD4+CD28+ T cells, CD8+CD28+/CD8+, CD8+HLA-DR+/CD8+, CD8+HLA-DR+ T cells, CD8+CD38+/CD8+, CD8+CD38+ T cells and CD4+/CD8+ than those in controls. Cancer progression were negatively associated with levels of B cells, CD4+ T cells, naïve CD4+/CD4+, naïve CD4+ T cells, CD4+CD28+ T cells, CD8+CD28+ T cells and positively associated with levels of NK cells, white blood cells (WBC), monocytes, neutrophils, eosinophils, basophils, monocytes to lymphocyte ratio (MLR), neutrophils to lymphocyte ratio (NLR), eosnophil to lymphocyte ratio (ELR), basophil to lymphocyte ratio (BLR), blood platelet to lymphocyte ratio (PLR) .Conclusions: Abnormal levels of NK cells, CD4+ T cells, naïve CD4+/CD4+, naïve CD4+ T cells, CD4+CD28+ T cells can be used as independently predictive biomarker for non-invasive early screening in NSCLC occurrence and progression.
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