[Retracted] Decision Optimization of Low-Carbon Dual-Channel Supply Chain of Auto Parts Based on Smart City Architecture

Table 1

Decision variables and parameters.

Variable or parameter	Definition of variable or parameter
	Auto parts supplier,
	Auto parts manufacturer,
	Physical retailer and online retailer of auto parts,; Physical retailer ; online retailer
	Auto parts market,
	Auto parts recycler,
, , , ,	The trading volume of auto parts supplier and manufacturer , auto parts manufacturer and physical retailer and online retailer , auto parts physical retailer and online retailer and demand market , auto parts demand market and recycler , auto parts recycler and manufacturer
, , , , ,	Transaction price or sales price of auto parts supplier, manufacturer, physical retailer, online retailer, demand market, and recycler
, ,	Purchasing cost function of auto parts suppliers, production cost function of new materials used by manufacturers, and production cost function of old materials used
, , , , , , , , , , ,	Transaction cost function of auto parts suppliers and manufacturers; transaction cost function of auto parts manufacturers and suppliers, physical retailers and online retailers, recyclers; storage cost function of auto parts physical retailers and online retailers, transaction cost function of physical retailers, online retailers and producers, transaction cost function of demand market; transaction cost function of auto parts demand market, physical retailers, online retailers and recyclers; auto parts recycling cost function of acquisition, transportation and storage, recycler and demand market, and transaction cost function of producer
, ,	Production, sales, and recovery of auto parts and components unit energy use cost of each process input
, ,	Production, sales, and recovery of auto parts unit carbon emission cost of each process output end
,	The amount of carbon emissions purchased and sold by a node auto parts enterprise is calculated in tons of carbon dioxide equivalent (),
,	Unit purchase and sale price of carbon trading
, ,	Weight coefficient of energy use at input nodes of production, sales, and recovery processes of auto parts
, ,	Carbon emission coefficient of output nodes of production, sales, and recovery processes of auto parts
,	Availability factor of raw materials from auto parts suppliers or reprocessed products from recyclers
	Demand function of auto parts market
	Conversion and reuse coefficient of recycled auto parts
	Disposal cost of unit scrapped auto parts
,	Characteristic coefficient of energy consumption and carbon emission converted into carbon dioxide equivalent
, ,	The maximum amount of carbon emission that can be purchased or sold and the amount of carbon emission distribution