Optimal choice of machine speeds for two-stage non-homogeneous systems

V. A. Strusevich

doi:10.1007/bf01069491

Policy Analyses on Promoting the Recycling of Express Packages

Sustainability ◽

10.3390/su12229504 ◽

2020 ◽

Vol 12 (22) ◽

pp. 9504

Author(s):

Lu Xiao ◽

Rongrong Fan ◽

Chaojie Wang ◽

Jun Wang

Keyword(s):

Optimal Choice ◽

Growing Up ◽

Stage Model ◽

Environment Protection ◽

Two Stage ◽

Tax Reduction ◽

The Government

With the development of e-commerce industry, the express enterprises are growing up rapidly. At the same time, they produce a large amount of express packaging garbage. The recycling of express packages has become an important issue for environment protection. In this paper, three types of possible policies are discussed for consideration: subsidy, penalty, and tax reduction. We analyze the efficiency of each policy and find the conditions under which the express packaging manufacturers prefer to recycle and reprocess the used products. A two-stage model is established from the perspective of manufacturers to discuss the production and recycling strategies under the three policies. Besides, we suggest an optimal choice between subsidy and tax reduction for the government when the budget is fixed. This paper provides guidelines for the government to improve related policies on promoting the recycling of express packages.

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Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100153816 ◽

1989 ◽

Vol 47 ◽

pp. 368-369

Author(s):

Sengshiu Chung ◽

Peggy Cebe

Keyword(s):

Single Crystals ◽

High Performance ◽

Dilute Solution ◽

Two Stage ◽

Annealing Behavior ◽

High Performance Polymers ◽

Seeding Method ◽

Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

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