将以下文字内容翻译成英文：本文构建了考虑购置补贴的混合整数非线性规划模型目标为最小化混合车队短期运营成本如油耗成本、耗电成本和车辆保养成本和长期投资成本如车辆购买成本、电池更换成本和获得购置补贴的时间成本考虑车辆装载、服务时间窗、充电时间、电池容量和购置补贴条件等约束。同时为了分析碳税和C&T机制的作用在考虑购置补贴模型的基础上增加了碳税成本和碳交易成本分别建立考虑碳税和C&T机制的模型。

This article constructs a mixed-integer nonlinear programming model that considers purchase subsidies. The objective is to minimize the short-term operating costs of the mixed fleet (such as fuel costs, electricity costs, and vehicle maintenance costs) and the long-term investment costs (such as vehicle purchase costs, battery replacement costs, and the time cost of obtaining purchase subsidies), while considering constraints such as vehicle loading, service time windows, charging time, battery capacity, and purchase subsidy conditions. Additionally, to analyze the impact of carbon taxes and C&T mechanisms, carbon tax costs and carbon trading costs are added to the purchase subsidy model, respectively, establishing models that consider carbon taxes and C&T mechanisms.