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Delayed purchase refers to consumers who have desire to purchase a product and ability to purchase it, but they tend to delay the purchase when making consumption decisions. Delaying purchases gives consumers more time to make decisions, but it doesn't necessarily lead to better results than instant decisions. For enterprises, the delayed purchase behavior of consumers will obviously pose a great threat to the improvement of their spot sales. Based on existing relevant research, this paper firstly reviews the definition and impact of delayed purchase, then summarizes the influencing factors and formation mechanism of consumers' delayed purchase behavior, finally, integrates related research on delayed purchase. The purpose of this paper is to provide theoretical support for enterprises to understand consumers' delayed purchase behavior and to formulate marketing strategies.

Objective: The objective of this study is to evaluate the efficacy prediction values of systemic immune-inflammation index (SII) and prognostic nutritional index (PNI) in breast cancer patients who received neoadjuvant chemotherapy.Methods: We registered a retrospective study include 72 breast cancer patients between February 2020 and January 2022. All patients had axillary lymph node metastasis receiving neoadjuvant therapy. Calculating PNI, SII before and after therapy were examined through blood routine. Chi-square test was used to compare the clinicopathological and laboratory parameters between groups. Using the logistic regression analysis to evaluate the prognosis values of the factors.Results: 18 patients (25%) achieved pathologic complete response (pCR) after neoadjuvant therapy. The pCR rate of breast patients had significant relationship with ER, PR, HER-2, molecular subgroup, tumor size, vascular invasion, nerve invasion, N stage, clinical stage and chemotherapy regimen. Low ΔPNI, high ΔSII and higher ΔPNI-ΔSII score values had better prediction of therapeutic effect, especially the ΔPNI-ΔSII score.Conclusion: The ΔPNI-ΔSII score may be an effective efficacy prediction index in breast cancer patients receiving neoadjuvant chemotherapy, which can help to identify high-risk groups and efficacy evaluation.

Silicon oxide films containing nanocrystalline silicon (nc-SiO𝑥:H) are deposited by co-sputtering technology at low temperatures (<400 ∘ C) that are much lower than the typical growth temperature of nc-Si in SiO2. The microstructures and bonding properties are characterized by Raman and FTIR. It is proven that an optimum range of substrate temperatures for the deposition of nc-SiO𝑥:H films is 200-400 ∘ C, in which the ratio of transition crystalline silicon decreases, the crystalline fraction is higher, and the hydrogen content is lower. The underlying mechanism is explained by a competitive process between nc-Si Wolmer-Weber growth and oxidation reaction, both of which achieve a balance in the range of 200-400 ∘ C. We further implement this technique in the fabrication of multilayered nc-SiO𝑥:H/a-SiO𝑥:H films, which exhibit controllable nc-Si sizes with high crystallization quality.