<b>Effect of Temperature Change and Contact-wire Wear on Current Collection Performance</b>

Temperature change is an important meteorological indicator reflecting weather stability. This study aimed to examine the effects of ambient temperature change on non-accidental mortality using diurnal temperature change (DTR) and temperature change between neighboring days (TCN) from two perspectives, intra-day and inter-day temperature change, and further, to explore seasonal variations of mortality, identify the susceptible population and investigate the interaction between temperature change and apparent temperature (AT). We collected daily data on cause-specific mortality, air pollutants and meteorological indicators in Shenzhen, China, from 1 January 2013 to 29 December 2017. A Quasi-Poisson generalized linear regression combined with distributed lag non-linear models (DLNMs) were conducted to estimate the effects of season on temperature change-related mortality. In addition, a non-parametric bivariate response surface model was used to explore the interaction between temperature change and AT. The cumulative effect of DTR was a U-shaped curve for non-accidental mortality, whereas the curve for TCN was nearly monotonic. The overall relative risks (RRs) of non-accidental, cardiovascular and respiratory mortality were 1.407 (95% CI: 1.233–1.606), 1.470 (95% CI: 1.220–1.771) and 1.741 (95% CI: 1.157–2.620) from exposure to extreme large DTR (99th) in cold seasons. However, no statistically significant effects were observed in warm seasons. As for TCN, the effects were higher in cold seasons than warm seasons, with the largest RR of 1.611 (95% CI: 1.384–1.876). The elderly and females were more sensitive, and low apparent temperature had a higher effect on temperature change-related non-accidental mortality. Temperature change was positively correlated with an increased risk of non-accidental mortality in Shenzhen. Both female and elderly people are more vulnerable to the potential adverse effects, especially in cold seasons. Low AT may enhance the effects of temperature change.

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Analysis of the evolvement of contact wire wear irregularity in railway catenary based on historical data

Vehicle System Dynamics ◽

10.1080/00423114.2017.1408919 ◽

2017 ◽

Vol 56 (8) ◽

pp. 1207-1232 ◽

Cited By ~ 7

Author(s):

Hongrui Wang ◽

Alfredo Núñez ◽

Zhigang Liu ◽

Yang Song ◽

Fuchuan Duan ◽

...

Keyword(s):

Historical Data ◽

Contact Wire ◽

Wire Wear

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Forest Soil Respirations are More Sensitive to Nighttime Temperature Change in Eastern China

Notulae Botanicae Horti Agrobotanici Cluj-Napoca ◽

10.15835/nbha47111322 ◽

2018 ◽

Vol 47 (1) ◽

pp. 249-254

Author(s):

Zhaoyong SHI ◽

Ke LI ◽

Yongming WANG ◽

Bede S. MICKAN ◽

Weikang YUAN ◽

...

Keyword(s):

Soil Respiration ◽

Soil Temperature ◽

Temperature Change ◽

Global Climate ◽

Eastern China ◽

Growing Season ◽

Mean Value ◽

Apparent Temperature ◽

Effect Of Temperature ◽

The Difference

Soil respiration is one of the main fluxes in the global carbon cycle. The effect of temperature on soil respiration is well understood. The response of soil respiration to temperature warming is called apparent temperature sensitivity (Q10) of soil respiration, which is an important parameter in modeling soil CO2 effluxes under global climate warming. The difference of Q10 between daytime and nighttime was hardly reported although attentions are attracted by the differences of temperature change and its effects on vegetation productivity. In this study, we investigated the Q10 of soil respiration in daytime and nighttime by modeling empirical functions based on the in situ measurement of soil respiration and temperature in temperate and subtropical forests of eastern China. Our results showed that the Q10 of soil respiration is higher in nighttime with the mean value of 2.74 and 2.35 than daytime with the average of 2.49 and 2.18 in all measured months and growing season, respectively. Moreover, the explanatory rate of soil temperature to soil respiration in nighttime is also higher than in daytime in each site in both all measured and growing seasons. The Q10 and explanatory rate of soil temperature to soil respiration in nighttime is 1.08 and 1.15 times in daytime in growing season. These findings indicate that soil respiration has a bigger sensitivity to temperature in nighttime than daytime. The change of soil temperature explains more variation of soil respiration in nighttime than daytime.

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