Effect of relative humidity on uniaxial cyclic softening/hardening and intrinsic heat generation of polyamide-6 polymer

2016 ◽  
Vol 56 ◽  
pp. 19-28 ◽  
Author(s):  
Kaijuan Chen ◽  
Guozheng Kang ◽  
Fucong Lu ◽  
Jia Chen ◽  
Han Jiang
Keyword(s):  
Relative Humidity ◽  
Heat Generation ◽  
Polyamide 6 ◽  
Cyclic Softening

scholarly journals Structure-Properties Relations for Polyamide 6, Part 2: Influence of Processing Conditions during Injection Moulding on Deformation and Failure Kinetics

Polymers ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 779 ◽  
Author(s):  
Emanuele Parodi ◽  
Gerrit Peters ◽  
Leon Govaert
Keyword(s):  
Mechanical Properties ◽  
Relative Humidity ◽  
Mold Temperature ◽  
Polyamide 6 ◽  
Testing Temperature ◽  
Full Description ◽  
Time To Failure ◽  
Processing Conditions ◽  
Creep Tests ◽  
Deformation And Failure

The effect of processing conditions during injection on the structure formation and mechanical properties of injection molded polyamide 6 samples was investigated in detail. A large effect of the mold temperature on the crystallographic properties was observed. Also the the effect of pressure and shear flow was taken in to consideration and analysed. The yield and failure kinetics, including time-to-failure, were studied by performing tensile and creep tests at several test temperatures and relative humidities. As far as mechanical properties are concerned, a strong influence of temperature and relative humidity on the yield stress and time-to-failure was found. A semi-empirical model, able to describe yield and failure kinetics, was applied to the experimental results and related to the crystalline phase present in the sample. In agreement with findings in the literature it is observed that for high mold temperatures the sample morphology is more stable with respect to humidity and temperature than in case of low mold temperatures and this effects could be successfully captured by the model. The samples molded at low temperatures showed, during mechanical testing, a strong evolution of the crystallographic properties when exposed to high testing temperature and high relative humidity, i.e., an increase of crystallinity or a crystal phase transition. This makes a full description of the mechanical behavior rather complicated.

Microclimatic conditions in maternity caves of the bent-wing bat, Miniopterus schreibersii: an attempted restoration of a former maternity site.

1994 ◽  
Vol 21 (6) ◽  
pp. 607 ◽  
Author(s):  
RV Baudinette ◽  
RT Wells ◽  
KJ Sanderson ◽  
B Clark
Keyword(s):  
Relative Humidity ◽  
Heat Generation ◽  
Heat Production ◽  
Narrow Range ◽  
Prime Factor ◽  
South Australia ◽  
Temperature Fluctuations ◽  
High Relative Humidity ◽  
South Eastern ◽  
Microclimatic Conditions

A 2-year study of Bat and Robertson caves in south-eastern South Australia provided information on the microclimatic conditions in a maternity cave of the bat Miniopterus schreibersii. The study also monitored changes in the temperature and humidity conditions in what is believed to be a former maternity site, Robertson Cave, following restoration of the damaged dome. The maternity cave, Bat Cave, was characterised by mild hypoxic and hypercapnic conditions, high relative humidity, and temperatures in the roosting area of around 30°C. Accumulated guano deposits had some areas of heat generation, but the bats themselves appeared to be the primary modifiers of their own microenvironment. To support this finding, the recapping of Robertson Cave resulted in high humidities and a narrow range of temperature fluctuations; however, the temperature never reached the levels seen in Bat Cave. Our conclusion that the heat production of the bats themselves is the prime factor affecting microclimatic conditions necessary for breeding may relate to the observation that few maternity sites serve large and widespread populations of this species.

Prediction of plasticity-controlled failure in polyamide 6: Influence of temperature and relative humidity

2017 ◽  
Vol 135 (11) ◽  
pp. 45942 ◽  
Author(s):  
Emanuele Parodi ◽  
Gerrit W. M. Peters ◽  
Leon E. Govaert
Keyword(s):  
Relative Humidity ◽  
Polyamide 6 ◽  
Influence Of Temperature

Heat Generation and Transport in the Earth

2010 ◽  
Author(s):  
Claude Jaupart ◽  
Jean-Claude Mareschal
Keyword(s):  
Heat Generation ◽  
The Earth

EPIDEMIOLOGY, ECOLOGY AND PREVALENCE OF SOIL TRANSMITTED HELMINTHS FROM KOSHI REGION OF NORTH BIHAR.

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
LAKSHMI CHOUDHARY ◽  
PRABHAWATI PRABHAWATI
Keyword(s):  
Relative Humidity ◽  
Ascaris Lumbricoides ◽  
Rainy Season ◽  
Climatic Factors ◽  
Trichuris Trichiura ◽  
Hookworm Infection ◽  
Soil Transmitted Helminths ◽  
High Incidence ◽  
Apparently Healthy

Prevalence of soil transmitted helminthes infections in apparently healthy school going children and other 528 people of different districts of Koshi regions of North Bihar were evaluated. Over all incidences of STHs infection was 39.39% during study. High incidence of STH was seen in the rainy season i.e., in the month of July and August, September, significantly higher (P<0.05) .The incidence of Ascaris lumbricoides was highest in the month of August (18.64%). The month of September was 15.25% followed by that of July (14.4%) and October with 10.16%. Also the incidence of hookworm registered the highest incidence in the month of June (19.27%) and lowest in the month of December (4.82%) during the study period. However prevalence of Trichuris trichiura was negligible and it was almost nil in the most of the months but was highest in month of September with 28.57% and lowest in October with 14.00% The climatic factors are responsible for soil transmitted helminthes which are temperature, rainfall and relative humidity. Ascariasis, Trichuriasis and Ancyclostomiasis (Hookworm infection) are found to be endemic in this region.

EL NINO RELATED CLIMATE AND DENGUE FEVER CASES IN JEDDAH, SAUDI ARABIA

2019 ◽  
Vol 25 (1) ◽  
Author(s):  
MASROOR ALI KHAN ◽  
KHALID AL GHAMDI ◽  
JAZEM A. MEHYOUB ◽  
RAKHSHAN KHAN
Keyword(s):  
Relative Humidity ◽  
Dengue Fever ◽  
El Niño ◽  
Significant Relationship ◽  
El Nino ◽  
Climate Data ◽  
Light Traps ◽  
Mosquito Abundance ◽  
Dengue Transmission ◽  
The Relationship

The focus of this study is to find the relationship between El Nino and dengue fever cases in the study area.Mosquito density was recorded with the help of light traps and through aspirators collection. Climate data were obtained from National Meteorology and Environment centre. (Year wise El Nino and La Nina data are according to NOAA & Golden Gate Weather Services). Statistical methods were used to establish the correlation coefficient between different factors. A high significant relationship was observed between Relative Humidity and Dengue fever cases, but Aedes abundance had no significant relationship with either Relative humidity and Temperature. Our conclusion is that the El Nino does not affect the dengue transmission and Aedes mosquito abundance in this region, which is supported by earlier works.

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