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Campbell, S.,Kwok, K.C.S.,Hitchcock, P.A.,Tse, K.T.,Leung, H.Y. Techno-Press 2007 Wind and Structures, An International Journal (WAS Vol.10 No.5
Field measurements of the wind-induced response of two residential reinforced concrete buildings, among the tallest in the world, have been performed during two typhoons. Natural periods and damping values have been determined and compared with other field measurements and empirical predictors. Suitable and common empirical predictors of natural period and structural damping have been obtained that describe the trend of tall, reinforced concrete buildings whose structural vibrations have been measured in the collection of studies in Hong Kong compiled by the authors. This data is especially important as the amount of information known about the dynamic parameters of buildings of these heights is limited. Effects of the variation of the natural period and damping values on the alongwind response of a tall building for serviceability-level wind conditions have been profiled using the gust response factor approach. When using this approach on these two buildings, the often overestimated natural periods and structural damping values suggested by empirical predictors tended to offset each other. Gust response factors calculated using the natural periods and structural damping values measured in the field were smaller than if calculated using design-stage values.
THE FIBONACCI LENGTH OF CERTAIN CENTRO-POLYHEDRAL GROUPS
CAMPBELL, C. M.,CAMPBELL, P. P. 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.19 No.1
We examine the Fibonacci length of certain centro-polyhedral groups and show that in some cases the lengths depend on tribonacci sequences. Further we obtain specific examples of infinite families of three-generator groups with constant, linear and (3-step) Wall number dependent Fibonacci lengths.
Campbell, Ian,Scott, Nina,Seneviratne, Sanjeewa,Kollias, James,Walters, David,Taylor, Corey,Roder, David Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6
Background: The Quality Audit (BQA) program of the Breast Surgeons of Australia and New Zealand (NZ) collects data on early female breast cancer and its treatment. BQA data covered approximately half all early breast cancers diagnosed in NZ during roll-out of the BQA program in 1998-2010. Coverage increased progressively to about 80% by 2008. This is the biggest NZ breast cancer database outside the NZ Cancer Registry and it includes cancer and clinical management data not collected by the Registry. We used these BQA data to compare socio-demographic and cancer characteristics and survivals by ethnicity. Materials and Methods: BQA data for 1998-2010 diagnoses were linked to NZ death records using the National Health Index (NHI) for linking. Live cases were followed up to December $31^{st}$ 2010. Socio-demographic and invasive cancer characteristics and disease-specific survivals were compared by ethnicity. Results: Five-year survivals were 87% for Maori, 84% for Pacific, 91% for other NZ cases and 90% overall. This compared with the 86% survival reported for all female breast cases covered by the NZ Cancer Registry which also included more advanced stages. Patterns of survival by clinical risk factors accorded with patterns expected from the scientific literature. Compared with Other cases, Maori and Pacific women were younger, came from more deprived areas, and had larger cancers with more ductal and fewer lobular histology types. Their cancers were also less likely to have a triple negative phenotype. More of the Pacific women had vascular invasion. Maori women were more likely to reside in areas more remote from regional cancer centres, whereas Pacific women generally lived closer to these centres than Other NZ cases. Conclusions: NZ BQA data indicate previously unreported differences in breast cancer biology by ethnicity. Maori and Pacific women had reduced breast cancer survival compared with Other NZ women, after adjusting for socio-demographic and cancer characteristics. The potential contributions to survival differences of variations in service access, timeliness and quality of care, need to be examined, along with effects of comorbidity and biological factors.
HIGH EFFICIENCY, BACK-CONTACT BIFACIAL SOLAR CELLS AND APPLICATION
Campbell, Matthew P.,DeCeuster, Denis M.,Cousins, Peter,Detrick, Adam,Manalo, Raphael,Mulligan, William P. 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
SunPower's corporate mission is to reduce the installed cost of solar electricity 50% by 2012. As part of that mission, the company is continually exploring novel technologies that might enable progress towards the goal. This paper describes SunPower's efforts to decrease the levelized cost of electricity for solar power plants through the use of bifacial cell and system technology. The results of the first production run of SunPower bifacial cells and modules are presented. Future bifacial system development plans are reviewed.
DOUBLE SERIES TRANSFORMS DERIVED FROM FOURIER-LEGENDRE THEORY
Campbell, John Maxwell,Chu, Wenchang Korean Mathematical Society 2022 대한수학회논문집 Vol.37 No.2
We apply Fourier-Legendre-based integration methods that had been given by Campbell in 2021, to evaluate new rational double hypergeometric sums involving ${\frac{{1}}{\pi}}$. Closed-form evaluations for dilogarithmic expressions are key to our proofs of these results. The single sums obtained from our double series are either inevaluable $_2F_1({\frac{4}{5}})$- or $_2F_1({\frac{1}{2}})$-series, or Ramanujan's <sub>3</sub>F<sub>2</sub>(1)-series for the moments of the complete elliptic integral K. Furthermore, we make use of Ramanujan's finite sum identity for the aforementioned <sub>3</sub>F<sub>2</sub>(1)-family to construct creative new proofs of Landau's asymptotic formula for the Landau constants.
Economic Conditions and Male First Marriage in Northeast China, 1749-1909
Campbell, Cameron,Lee, James 성균관대학교 동아시아학술원 2008 Sungkyun Journal of East Asian Studies Vol.8 No.1
This paper shows that economic conditions, as reflected in grain prices, helped determine rates of bachelorhood in northeast China from 1749 to 1909. For many rural populations, high grain prices are a useful measure of economic conditions because they typically indicate a poor harvest, leading to increased economic pressure and reduced consumption. Our analysis of 30,000 unmarried adult mates in rural Liaodong from 1749-1909 indicate that while current grain prices did not affect marriage chances, prior grain prices twenty years previous did: boys born when grain prices were high were more likely to never marry than boys born under normal conditions. Results are consistent with an explanation in which increased incidence of female neglect or possibly infanticide when times were bad led to worsened sex imbalances in the marriage market two decades later.