Preparation, Characterization and Performance Study of Poly(isobutylene-alt-maleic anhydride) [PIAM] and Polysulfone [PSf] Composite Membranes before and after Alkali Treatment

2011 ◽  
Vol 50 (11) ◽  
pp. 6528-6534 ◽  
Author(s):  
Mahesh Padaki ◽  
Arun M. Isloor ◽  
Ganesh Belavadi ◽  
K. Narayan Prabhu
Keyword(s):  
Maleic Anhydride ◽  
Alkali Treatment ◽  
Composite Membranes ◽  
Performance Study ◽  
Before And After ◽  
And Performance

scholarly journals Performance of PS/PIMA/PPEES Nanofiltration Membranes before and after Alkali Treatment for Filtration of CaCl2 and NaCl

Nano Hybrids ◽  
2012 ◽  
Vol 1 ◽  
pp. 99-118 ◽  
Author(s):  
Chitrakara Hegde ◽  
Arun Mohan Isloor ◽  
B.M. Ganesh ◽  
Ahmad Fauzi Ismail ◽  
M.S. Abdullah ◽  
...  
Keyword(s):  
Membrane Filtration ◽  
Sodium Hydroxide Solution ◽  
Alkali Treatment ◽  
Composite Membranes ◽  
Size Exclusion ◽  
Polymeric Membrane ◽  
Performance Study ◽  
Before And After ◽  
Exclusion Mechanism ◽  
Contact Angle Analysis

Present article describes about the preparation of Nanofiltration (NF) composite membranes by a simple chemical treatment to the polymeric membrane composed of Poly (isobutylene-alt-maleic anhydride). After composition, anhydride functionality was converted to diacid functionality by hydrolysis using sodium hydroxide solution. Further, membrane was characterized by ATR-IR, DSC and SEM. Charge confirmation was done by IEC. Water uptake and contact angle analysis was carried out to study the hydrophilicity of the membrane. The performance study was carried out by using NaCl and CaCl2 solutions. Membranes were having higher charge density, which has resulted in better performance in terms of rejection of CaCl2 and NaCl solutions. The main focus of this research is to evaluate the effect of alkali treatment on Donnan and size exclusion mechanism during membrane filtration.

Preparation and Performance Study of Fluorosilicone Oligomer Anti-Sticking Coatings

2020 ◽  
Vol 841 ◽  
pp. 209-213
Author(s):  
Dong Bo Guan ◽  
Xiao Jie Zhai ◽  
Ying Nan Biansai ◽  
Bo Jun Cao ◽  
Yong Fu Zhu ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Contact Angle ◽  
Infrared Spectroscopy ◽  
Contact Time ◽  
Curing Agent ◽  
Performance Study ◽  
Film Forming ◽  
Increasing Trend ◽  
Before And After ◽  
And Performance

In this paper, fluorosilicone oligomer and its curing agent are used as the main film-forming materials, and fluorosilicone POSS is added to reduce the surface energy of the composites to prepare a coating with certain anti-sticking effect. The changes of molecular structure before and after the reaction were obtained by infrared spectroscopy. The contact angle and anti-sticking property of the coating surface were studied by changing the content of POSS containing fluorine. It was found that the contact angle of fluorine-containing POSS reached 98.7° when the content of fluorine-containing POSS was 3 Wt.%. With the increase of POSS content, the anti-sticking force of composites changed little, but with the increase of the contact time of tape, the anti-sticking force showed an increasing trend.

Structural Design and Performance Study of Parallel Metamorphic Mechanism Based on Screw System Theory

2014 ◽  
Vol 527 ◽  
pp. 162-166
Author(s):  
Sheng Hai Hu ◽  
Hong Guang Wang ◽  
Ting Ting Xie ◽  
Tian Shi Sun
Keyword(s):  
System Theory ◽  
Degrees Of Freedom ◽  
Kinematic Pair ◽  
Performance Study ◽  
Cutting Mechanism ◽  
Metamorphic Mechanism ◽  
Before And After ◽  
New Type ◽  
Branched Chain ◽  
And Performance

A new type of metamorphic kinematic pair is designed according to the traditional kinematic pair, and further a novel parallel metamorphic cutting mechanism is designed. Based on screw system theory the constraints of structure branched chain on the end of the moving platform are analyzed before and after transformation, and then the degrees of freedom of the novel parallel metamorphic cutting mechanism is calculated, and the exact axis that the mechanism rotates across can also be obtained.

Replication of the Superstition and Performance Study by

2014 ◽  
Vol 45 (3) ◽  
pp. 239-245 ◽  
Author(s):  
Robert J. Calin-Jageman ◽  
Tracy L. Caldwell
Keyword(s):  
Task Difficulty ◽  
Statistical Power ◽  
Meta Analysis ◽  
A Priori ◽  
Significant Heterogeneity ◽  
Performance Study ◽  
Improve Performance ◽  
Research Designs ◽  
Series Of Experiments ◽  
And Performance

A recent series of experiments suggests that fostering superstitions can substantially improve performance on a variety of motor and cognitive tasks ( Damisch, Stoberock, & Mussweiler, 2010 ). We conducted two high-powered and precise replications of one of these experiments, examining if telling participants they had a lucky golf ball could improve their performance on a 10-shot golf task relative to controls. We found that the effect of superstition on performance is elusive: Participants told they had a lucky ball performed almost identically to controls. Our failure to replicate the target study was not due to lack of impact, lack of statistical power, differences in task difficulty, nor differences in participant belief in luck. A meta-analysis indicates significant heterogeneity in the effect of superstition on performance. This could be due to an unknown moderator, but no effect was observed among the studies with the strongest research designs (e.g., high power, a priori sampling plan).

ELIXIR TO EXAMINATION STRESS AMONG STUDENT - STUDY SKILLS TRAINING AND SYSTEMATIC DESENSITIZATION

2018 ◽  
Vol 6 (26) ◽  
Author(s):  
Jyoti Baijal
Keyword(s):  
Study Skills ◽  
Knowledge Society ◽  
Skills Training ◽  
Well Being ◽  
Systematic Desensitization ◽  
Performance Study ◽  
High Stakes ◽  
Deficit Model ◽  
Examination Stress ◽  
And Performance

Examination stress is a ubiquitous phenomenon that has, in the present times, adversely affected the learning outcomes and performance of the students at all levels- primary, secondary or higher education. It’s increasing intensity specifically among students appearing for high stakes board examination evokes a response from the teaching fraternity at the earliest. The reason being that a prolonged experience of stress with respect to evaluative situations is bound to prove detrimental to the mental, physical and emotional well-being of the students. For the nation to develop and progress towards a knowledge society, it is imperative that the students are taught to cope with stressful stimuli and improve performance. Study-Skills Training is an intervention intended to improve their study and test- taking habits and skills. It is based on a cognitive-deficit model which is directed towards improving a variety of cognitive activities that affect the organization, processing and retrieval of information and thereby help in reducing the experience of examination stress. Systematic desensitization as a process can be used to unlearn anxiety reactions by replacing the anxiety response with a calm, relaxed state. Thus, a combination of study-skills training and systematic desensitization has been shown to be effective and superior in alleviating test anxiety

scholarly journals Development and performance study of a natural silk fiber facial mask paper

2020 ◽  
Vol 15 ◽  
pp. 155892502097575
Author(s):  
Huiling Wang ◽  
Bin Zhou
Keyword(s):  
Silk Fiber ◽  
Entrainment Rate ◽  
Performance Study ◽  
Wet Strength ◽  
Facial Mask ◽  
Antibacterial Performance ◽  
Lower Elongation ◽  
The Common ◽  
And Performance ◽  
Acid Structure

Facial masks are beauty products which composed of a facial mask paper and beauty solution. Silk contains the amino acid structure closest to the human skin, and has the skin-friendly, cosmetic and antibacterial functions, but the common method for making nonwoven facial mask paper is not suitable for silk. In this paper, the silkworm’s spinning path is intervened manually to obtain a smart silk facial mask paper (SMC) of controllable thickness, so that the sericin on the silk fiber is well preserved. In the experiment where the SMC is compared with the nonwoven 384-cuprammonium rayon facial mask paper (CRMC) which is the most widely used in the market, it is found that the ways of forming the two facial mask paper are completely different, and therefore the morphologies under SEM are obviously different. The thickness of the SMC is 0.183 mm and the areal weight of it is 38.0 g/m2. It is very close to the CRMC (0.187 mm, 38.4 g/m2). The porosity of the SMC is 84.0%, which is slightly lower than that of the CRMC (86.3%), but its pores are well distributed. Compared with the CRMC, the smart SMC has higher dry and wet strength, lower elongation, slightly lower air permeability and liquid entrainment rate, and better antibacterial performance.

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