Clinical Evaluation of a Direct Method for the Intrusion of Supraerupted Maxillary Molars: A Preliminary Study

2015 ◽  
Vol 28 (6) ◽  
pp. 610-611 ◽  
Author(s):  
Célia Pinzan-Vercelino ◽  
Júlio Gurgel ◽  
Kellyne Carvalho ◽  
Carollyne Tiago ◽  
Arnaldo Pinzan
Keyword(s):  
Clinical Evaluation ◽  
Direct Method ◽  
Maxillary Molars ◽  
Preliminary Study ◽  
A Direct Method

A DIRECT METHOD OF OPERATIONAL CALCULUS (I)

1982 ◽  
Vol 2 (4) ◽  
pp. 389-402 ◽  
Author(s):  
Lianrong Qiu
Keyword(s):  
Direct Method ◽  
Operational Calculus ◽  
Calculus I ◽  
A Direct Method

A Direct Method of Preparation of Diazirine

1962 ◽  
Vol 84 (6) ◽  
pp. 1063-1064 ◽  
Author(s):  
W. H. Graham
Keyword(s):  
Direct Method ◽  
A Direct Method

scholarly journals Plastic waste to fuels by hydrocracking at mild conditions

2021 ◽  
Vol 7 (17) ◽  
pp. eabf8283
Author(s):  
Sibao Liu ◽  
Pavel A. Kots ◽  
Brandon C. Vance ◽  
Andrew Danielson ◽  
Dionisios G. Vlachos
Keyword(s):  
Direct Method ◽  
Acid Sites ◽  
Liquid Fuels ◽  
High Yield ◽  
Tandem Catalysis ◽  
Hy Zeolite ◽  
Environmental Threat ◽  
Single Use ◽  
Initial Activation ◽  
A Direct Method

Single-use plastics impose an enormous environmental threat, but their recycling, especially of polyolefins, has been proven challenging. We report a direct method to selectively convert polyolefins to branched, liquid fuels including diesel, jet, and gasoline-range hydrocarbons, with high yield up to 85% over Pt/WO3/ZrO2 and HY zeolite in hydrogen at temperatures as low as 225°C. The process proceeds via tandem catalysis with initial activation of the polymer primarily over Pt, with subsequent cracking over the acid sites of WO3/ZrO2 and HY zeolite, isomerization over WO3/ZrO2 sites, and hydrogenation of olefin intermediates over Pt. The process can be tuned to convert different common plastic wastes, including low- and high-density polyethylene, polypropylene, polystyrene, everyday polyethylene bottles and bags, and composite plastics to desirable fuels and light lubricants.

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