Assumption College is a private, Roman Catholic, liberal arts college located on 185 acres in Worcester, Massachusetts. Assumption has an enrollment of about 2,117 undergraduates. The college confers Bachelor of Arts degrees in its undergraduate program, Master of Arts and Masters of Business Administration degrees in its Graduate program, and Associate's degree through its Continuing Education program. Though majors in the science are offered, only Bachelor of Arts degrees are conferred. Wikipedia.
Adhikari A.,Assumption College at Salisbury |
Lozano K.,University of Texas-Pan American
Journal of Polymer Research | Year: 2011
Differential scanning calorimetry (DSC) was used to investigate the crystallization behavior of polyethylene oxide (PEO) and carbon nanofiber (CNF) filled PEO systems under non-isothermal experimental conditions. The dispersion and distribution of CNF of the composites were studied using scanning electron microscopy. Studies showed the uniform segregation of CNFs in PEO. Different crystallization kinetic models were used to study the dependence of crystal nucleation on the filler content. Modified Avrami analysis showed that PEO undergoes change of crystallization from 3-D to 1-D crystal while going from primary to secondary crystallization. The crystallization kinetic of PEO reversed at CNF loading higher than 1 wt% of PEO. Based on modified Avrami and the combined approach of Avrami and Ozawa, it is concluded that the CNF retards the crystallization of PEO at all CNF loading under study. © 2010 Springer Science+Business Media B.V.
Ma Q.,Tufts University |
Georgiev G.,Tufts University |
Georgiev G.,Assumption College at Salisbury |
Cebe P.,Tufts University
Polymer | Year: 2011
The nanoscale phase behavior of a semicrystalline polymer is important for mechanical, thermal, optical and other macroscopic properties and can be analyzed well by thermal methods. Using quasi-isothermal (QI) heat capacity measurements, we investigate the formation behavior of the crystalline, mobile amorphous, and rigid amorphous fractions in poly(trimethylene terephthalate), PTT. The crystal and rigid amorphous phases comprise the total solid fraction in PTT at temperatures above T g, the glass transition temperature of the mobile amorphous fraction. PTT was quasi-isothermally cooled step-wise from the melt which causes its crystalline fraction to be fixed below 451 K. Between the high temperature fulfillment of the T g step and 451 K, the temperature dependent rigid amorphous fraction (RAF) is completely determined. For PTT, most of the RAF vitrifies between 451 K and T g step by step during QI cooling after the crystals have formed. The constraints imposed by the crystal surfaces reduce the mobility of the highly entangled polymer chains. We suggest the vitrification of RAF proceeds outward away from the lamellar surfaces in a step by step manner during QI cooling. Upon reheating, devitrification of RAF occurs at a temperature above its previous vitrification temperature, due to the effects of densification brought by physical aging during the long period of quasi-isothermal treatment. Finally, we consider recent concepts related to jamming, which have been suggested to apply to filled polymer systems, and may also be applicable in describing constraints exerted by crystal lamellae upon the RAF. © 2011 Elsevier Ltd. All rights reserved.
Davie E.A.C.,Assumption College at Salisbury
Journal of Chemical Education | Year: 2015
An adaptable multistep synthesis project designed for the culmination of a second-year organic chemistry laboratory course is described. The target compound is a terphenyl derivative that is an intermediate in the synthesis of compounds used in organic light-emitting devices. Students react a conjugated diene with dimethylacetylene dicarboxylate in a Diels-Alder reaction, then use enolate chemistry to isomerize and aromatize the adduct. Analysis of the synthesized intermediates and final compound is accomplished by thin-layer chromatography, NMR, and melting point. The synthesis can be expanded to four or five steps by linking to a previously published preparation of the diene. In addition to gaining experience with classic reactions in undergraduate organic chemistry courses, students are exposed to the utility of NMR spectroscopy by tracking subtle changes in the NMR spectra of structurally similar species. © 2015 The American Chemical Society and Division of Chemical Education, Inc.
Blair L.M.,University of Auckland |
Colby Davie E.A.,Assumption College at Salisbury |
Sperry J.,University of Auckland
Organic and Biomolecular Chemistry | Year: 2014
The natural product montamine was originally assigned as a homodimer of moschamine linked by a N-N′ bond at the serotonin side-chain. A total synthesis of the reported structure has shown this to be incorrect. Analysis of the spectroscopic data suggests that the dimerization site has been incorrectly assigned, and montamine is likely to be a 4,4′-bismoschamine natural product previously described in the literature. This journal is © the Partner Organisations 2014.
Doerfler L.A.,University of Massachusettes Medical School |
Doerfler L.A.,Assumption College at Salisbury |
Connor D.F.,University of Connecticut Health Center |
Toscano Jr. P.F.,University of Massachusettes Medical School
Journal of Affective Disorders | Year: 2011
Background: This study had two objectives: (1) examine characteristics of aggression in children and adolescents diagnosed with bipolar disorder and (2) determine whether the CBCL pediatric bipolar disorder profile differentiated youngsters with bipolar disorder from youngsters with ADHD. Method: Children and adolescents referred to a pediatric psychopharmacology clinic were systematically evaluated for psychopathology using a psychiatrist-administered diagnostic interview, parent- and teacher-report rating scales assessing the child's behavior, and child-completed self-report scales. In this sample, 27 children and adolescents were diagnosed with bipolar disorder and 249 youngsters were diagnosed with ADHD without co-occurring bipolar disorder. These two groups were compared to determine whether there were significant differences on various measures of psychopathology. Results: Youngsters diagnosed with bipolar disorder were more verbally aggressive and exhibited higher levels of reactive aggression than youngsters with ADHD without co-occurring bipolar disorder. Youngsters with bipolar disorder also reported higher levels of depressive symptoms than youngsters with ADHD without bipolar disorder. The CBCL pediatric bipolar disorder profile did not accurately identify youngsters diagnosed with bipolar disorder. Conclusions: The present findings present a picture of manic youngsters as verbally aggressive and argumentative, who respond with anger when frustrated. Youngsters diagnosed with bipolar disorder and ADHD exhibited significant levels of impulsive behavior and attention problems, but youngsters with bipolar disorder also exhibited significant levels of aggressive behavior and dysphoric mood. Finally, the CBCL pediatric bipolar disorder profile did not accurately identify youngsters who were diagnosed with bipolar disorder. © 2010 Elsevier B.V. All rights reserved.