Quantifying the Dynamics of Polystyrene Microplastics UV-Aging Process

Author(s):  
Ziyi Liu ◽  
Yanjie Zhu ◽  
Shangsi Lv ◽  
Yuxian Shi ◽  
Shuofei Dong ◽  
...  
Keyword(s):  
2015 ◽  
Vol 93 ◽  
pp. 1125-1131 ◽  
Author(s):  
Wenbo Zeng ◽  
Shaopeng Wu ◽  
Jin Wen ◽  
Zongwu Chen

2014 ◽  
Vol 599 ◽  
pp. 265-270 ◽  
Author(s):  
Pan Fei Liu ◽  
Jun Zheng ◽  
Shao Peng Wu

In this paper the effect of Layered double hydroxides (LDHs) on aging properties of asphalts was studied. The thin film oven test TFOT tests and ultraviolet (UV) aging process were used to simulate short-term and long-term aging of asphalts, respectively. After aging, the physical properties and dynamic shear rheological behaviors of LDHs modified asphalts were investigated. The viscosity of LDHs modified asphalts was measured by Brookfield viscometer before and after UV aging. After UV aging, with an increase of LDHs, softening point and viscosity value of modified asphalts decreased, while both of ductility and penetration increased, compared to base asphalts. Temperature sweep tests showed that the complex modulus of LDHs modified asphalts was lower than that of base asphalt, while phase angle was higher. The results showed that LDHs improved the UV aging resistance of the asphalt, and it could prevent asphalt from UV aging.


2016 ◽  
Vol 847 ◽  
pp. 413-417 ◽  
Author(s):  
Li Gao ◽  
Jian Ying Yu ◽  
Min Wu ◽  
Li Hui Xue

Ultraviolet (UV) absorber residue was used to modify bitumen. Effects of UV absorber residue on thermo-oxidative and UV aging properties of bitumen were evaluated by conventional physical properties and SARA (saturates, aromatics, resins and bitumenenes) analysis. The results showed that the viscosity aging index (VAI) and softening point increment (SPI) of bitumen decreased significantly due to introduction of the UV absorber residue, and the ductility retention rate (DRR) was evidently higher compared to the pristine bitumen. SARA show that UV absorber residue can effectively restrain the gelatinization of bitumen resulted from aging. As a consequence, the UV absorber residue modified bitumen displays enhanced aging resistance properties, which can be attributed to the physical sorption of activated carbon to lighter components in the thermo-oxidative aging process and the absorption of UV absorption residue to the ultraviolet light in the process of UV aging.


2020 ◽  
Vol 247 ◽  
pp. 118547 ◽  
Author(s):  
Chao Peng ◽  
Shifan Huang ◽  
Zhanping You ◽  
Fang Xu ◽  
Lingyun You ◽  
...  

GeroPsych ◽  
2015 ◽  
Vol 28 (2) ◽  
pp. 47-55 ◽  
Author(s):  
Eva-Marie Kessler ◽  
Catherine E. Bowen

Both psychotherapists and their clients have mental representations of old age and the aging process. In this conceptual review, we draw on available research from gerontology, social and developmental psychology, and communication science to consider how these “images of aging” may affect the psychotherapeutic process with older clients. On the basis of selected empirical findings we hypothesize that such images may affect the pathways to psychotherapy in later life, therapist-client communication, client performance on diagnostic tests as well as how therapists select and apply a therapeutic method. We posit that interventions to help both older clients and therapists to reflect on their own images of aging may increase the likelihood of successful treatment. We conclude by making suggestions for future research.


2004 ◽  
Vol 20 (4) ◽  
pp. 262-274 ◽  
Author(s):  
Manuel de Gracia Blanco ◽  
Josep Garre Olmo ◽  
María Marcó Arbonès ◽  
Pilar Monreal Bosch

Summary: Self-concept is a construct consisting of a group of specific self-perceptions that are hierarchically organized. Age-associated changes of self-concept are related to the individual's perception of the changes occurring throughout the aging process. The authors examined external validity and internal consistency of an instrument that has been developed to assess self-concept in older adults and examined self-concept's characteristics in two different contexts. Results confirm the multidimensionality of the scale and show a satisfactory external validity, indicating good discriminatory capacity. Findings support the hypothesis that older people who live in a nursing home have a poor self-esteem, self-concept, and psychological well-being and have a greater presence of depressive symptoms than people who live in their own home.


2013 ◽  
Author(s):  
Li Qu ◽  
Joel Jia Wei Low ◽  
Chengcheng Jiang ◽  
Qiao Dai ◽  
Ting Zhang ◽  
...  

2017 ◽  
Vol 1 (1) ◽  
pp. 31-47 ◽  
Author(s):  
Ori Tavor

Scientific advances in the field of biomedicine have fundamentally changed the ways in which we think about our bodies. Disease, aging, and even death, are no longer seen as inevitable realities but as obstacles that can be controlled, and in some cases even reversed, by technological means. The current discourse, however, can be enriched by an investigation of the various ways in which the aging process was perceived and explained throughout human history. In this article, I argue that in early China, the experience of aging and the challenges and anxieties it produced played a constitutive role in the shaping of religious culture. Drawing on a variety of medical, philosophical, and liturgical sources, I outline two models of aging: one that presented aging, and especially the loss of virility, as an undesirable but solvable condition that can be reversed with the aid of various rejuvenation techniques, and a more socially conscious model that depicted aging as a process of gradual social ascension, a natural but fundamentally unalterable condition that should be accepted, marked, and even celebrated through ritual. I conclude by demonstrating the legacy and lasting influence of these models on two of the most fundamental tenets of Chinese religion: the pursuit of longevity and the ideal of filial piety.


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