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Search Results: 1 - 10 of 142409 matches for " Jia-Yue Li "
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On the Predictability of Long-Range Dependent Series
Ming Li,Jia-Yue Li
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/397454
Abstract: This paper points out that the predictability analysis of conventional time series may in general be invalid for long-range dependent (LRD) series since the conventional mean-square error (MSE) may generally not exist for predicting LRD series. To make the MSE of LRD series prediction exist, we introduce a generalized MSE. With that, the proof of the predictability of LRD series is presented in Hilbert space.
H lder Scales of Sea Level
Ming Li,YangQuan Chen,Jia-Yue Li,Wei Zhao
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/863707
Abstract:
H?lder Scales of Sea Level
Ming Li,YangQuan Chen,Jia-Yue Li,Wei Zhao
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/863707
Abstract: The statistics of sea level is essential in the field of geosciences, ranging from ocean dynamics to climates. The fractal properties of sea level, such as long-range dependence (LRD) or long memory, noise behavior, and self-similarity (SS), are known. However, the description of its multiscale behavior as well as local roughness with the H?lder exponent from a view of multifractional Brownian motion (mBm) is rarely reported, to the best of our knowledge. In this research, we will exhibit that there is the multiscale property of sea level based on s of sea level data recorded by the National Data Buoy Center (NDBC) at six stations in the Florida and Eastern Gulf of Mexico. The contributions of this paper are twofold as follows. (i) H?lder exponent of sea level may not change with time considerably at small time scale, for example, daily time scale, but it varies significantly at large time scale, such as at monthly time scale. (ii) The dispersion of the H?lder exponents of sea level may be different at different stations. This implies that the H?lder roughness of sea level may be spatial dependent. 1. Introduction The study of sea level fluctuations plays a role in geosciences [1–3]. There are two categories of time scales of sea level. One is for yearly data with time scales in one yr, or 10?yr, or more; see, for example, [4–16]. The other is about data with time scales hourly, daily, weekly, or monthly; see, for example, [17–39]. The former generally relates to the study of trend of relative mean sea level with respect to global and Earth or planetary changes, for example, in the filed of climates, while the latter is usually associated with the research of local dynamics of sea level in the aspects of navigations, coastal engineering, tide power production, ship design, and so forth. Our research uses the hourly sea level data recorded by NDBC [40]. Since the pioneering work of Hurst on time series with long-range dependence (LRD) is observed in the Nile Basin [41], the LRD property of time series in geosciences has been widely observed; see, for example, [42–59]. By LRD, one means that the covariance function of time series decays so slowly such that where is time lag and . Therefore, LRD is a global property of time series [60–66]. In addition to LRD, there is another essential property of processes in geosciences, called self-similarity (SS); see, for example, [67–84]. By SS, we mean that a random function satisfies the property given by where is the equality in distribution, is the Hurst parameter that measures SS, and is a scale [61, 83–86].
Brachial-ankle pulse wave velocity is an independent predictor of carotid artery atherosclerosis in the elderly

Jia-Yue Li,Yu-Sheng Zhao,

老年心脏病学杂志(英文版) , 2010,
Abstract: Objective Brachial-ankle pulse wave velocity (baPWV) is widely used as a simple noninvasive measure of arterial stiffness. The aim of this study was to evaluate the usefulness of baPWV as a predictor of the carotid artery atherosclerosis in the elderly. Methods A total of 721 elderly participants (mean±SD age, 70.3±5.6years) were enrolled in the current study. All participant underwent both baPWV measurement and B-mode ultrasound for the intima-media thickness. Carotid atherosclerosis (CAS) was defined as the present of carotid plaque or and/or intima media thickness for at least 1.1 mm. Results A multivariate logistic regression analysis reveals that age, sex, brachial-ankle pulse wave velocity, smoking and LDL-C level showed a significant correlation with the presence of CAS. The odds ratios of CAS associated with a 500cm/s increase of brachial-ankle pulse wave velocity were 2.378 95% confidence interval, 1.36 to 4.00, P<0.05], 3.733 95% confidence interval, 1.729 to 8.058, P<0.01], 4.438 95% confidence interval, 1.659 to 11.803, P<0.01]. The baPWV significantly correlated with IMT by bivariate correlation analysis (r=0.39; p=0.001). After adjusting for factors influencing, baPWV all the same correlated with IMT (r=0.35; p=0.001).Conclusion These results indicate that brachial-ankle PWV is an independent predictor of CAS in the elderly.It also means that the direct measurement of arterial stiffness by this simple method may be of great help for the evaluation of carotid artherosclerosis , at least in the elderly (J Geriatr Cardiol 2010; 7:157-160).
Brachial-ankle pulse wave velocity is an independent predictor of carotid artery atherosclerosis in the elderly
Jia-Yue Li,Yu-Sheng Zhao
老年心脏病学杂志(英文版) , 2010,
Abstract: Objective Brachial-ankle pulse wave velocity (BAPWV) is widely used as a simple noninvasive measure of arterial stiffness. The aim of this study was to evaluate the usefulness of BAPWV as a predictor of the carotid artery atherosclerosis in the elderly. Methods A total of 721 elderly participants (mean ± SD, 70.3 ± 5.6years) were enrolled in the current study. All participant underwent both BAPWV measurement and B-mode ultrasound for the intima-media thickness. Carotid atherosclerosis (CAS) was defined as the present of carotid plaque or and/or intima media thickness for at least 1.1 mm. Results A multivariate logistic regression analysis reveals that age, sex, brachial-ankle pulse wave velocity, smoking and LDL-C level showed a significant correlation with the presence of CAS. The odds ratios of CAS associated with a 500 cm/s increase of brachial-ankle pulse wave velocity were 2.378 [95% confidence interval, 1.36 to 4.00, P < 0.05], 3.733 [95% confidence interval, 1.729 to 8.058, P < 0.01], 4.438 [95% confidence interval, 1.659 to 11.803, P < 0.01]. The BAPWV significantly correlated with IMT by bivariate correlation analysis (r = 0.39; P = 0.001). After adjusting for factors influencing, BAPWV all the same correlated with IMT (r = 0.35; P = 0.001). Conclusion These results indicate that brachial-ankle PWV is an independent predictor of CAS in the elderly.It also means that the direct measurement of arterial stiffness by this simple method may be of great help for the evaluation of carotid artherosclerosis , at least in the elderly.
Glycemic and blood pressure control in older patients with hypertension and diabetes: association with carotid atherosclerosis
Hong-Wei Du,Jia-Yue Li,Yao He
老年心脏病学杂志(英文版) , 2011,
Abstract: Backgroud Numerous studies have confirmed the effectiveness of slowing the progression of atherosclerosis by blood pressure (Bp) control in patients with hypertension and several studies also showed the efficacy of intensive glycemic control in decreasing progression of carotid intima-media thickness (CIMT) in patients with type 1 and type 2 diabetes. However, few studies have compared the relative importance of glycemic vs. Bp control in patients with diabetes and hypertension. We aimed to investigate the association between Bp and glycemic control and subclinical carotid atherosclerosis in older patients with hypertension and type 2 diabetes. Methods In a cross-sectional study, B-mode high-resolution ultrasonography of the carotid artery was performed in 670 subjects (508 males and 162 females) aged 60 years or over who had self-reported hypertension and diabetes but no history of coronary heart disease or stroke. Subjects were categorized by their systolic blood pressure: tight control, < 130 mmHg; usual control, 130–139 mmHg; or uncontrolled, ≥ 140 mmHg, and by their hemoglobin A1c (HbA1c) level: tight control, < 6.5%; usual control, 6.5%–7.5%; or uncontrolled, ≥ 7.5%, respectively. Results The mean CIMT was 8.20 +/- 0.11 mm, and carotid plaque was found in 52.5% (352/670) subjects. Overall, 62.1% of the subjects had subclinical carotid atherosclerosis, defined as having either carotid plaque or elevated CIMT (≥ 1.1 mm). The mean CIMT was significantly different between Bp control categories (7.60 +/- 0.09 mm, 7.90 +/- 0.08 mm, and 8.60 +/- 0.12 mm, respectively, P = 0.03) but not between glycemic control categories (8.20 +/- 0.10 mm, 8.1 +/- 0.08 mm, and 8.40 +/- 0.14 mm, respectively, P = 0.13) using ANCOVA analysis. Multivariable logistic regression adjusting for potential confounding factors showed that usual or uncontrolled Bp control were associated with having carotid plaque (OR = 1.08 and OR = 1.42, respectively), or elevated CIMT [Odd ratio (OR) = 1.17, 95% confidence interval (CI) 1.04–2.24, and OR = 1.54, 95% CI 1.36–2.96, respectively compared to tight Bp control; but did not show glycemic control as independent predictor of either having carotid plaque or elevated CIMT. Conclusions In older patients with hypertension and diabetes, blood pressure control, but not glycemic control is associated with subclinical carotid atherosclerosis.
Novel Approach to Grow ZnO Bulk Crystals
LI Xin-Hua,XU Jia-Yue, SHEN Hui, LI Xiao-Min
无机材料学报 , 2007,
Abstract: Base on the crystallization behavior of the ZnO-PbF2 system, a flux Bridgman growth technique with a gas cooling system was developed for the growth of ZnO crystal. By optimizing the growth parameters, transparent ZnO crystal with the size of φ25mm×5mm was obtained from the high temperature solutions. As-grown crystal has wurtzite structure with lattice parameters a=0.3252nm and b=0.5209nm, respectively. The preferred growth direction of the ZnO crystals is [0001] determined by X-ray orientation. The growth results show that the flux Bridgman method is a potential approach to grow large size ZnO crystals at low cost.
Mutational analysis of KCNJ11 in Chinese elderly essential hypertensive patients
Jia-Yue Li,Zong-Bin Li,Mei Zhu,Yu-Qi Liu
老年心脏病学杂志(英文版) , 2012,
Abstract: Objective To compare the distribution of KCNJ11 polymorphisms between elderly Chinese population with and without hypertension. Methods We examined the mutation of KCNJ11 gene by directly sequencing. Data for the present study were obtained from 250 hypertensive subjects (60 to 83 years old) as well as 250 normotensive subjects (60 to 86 years old). Results We found nine different mutations in KCNJ11, including six novel mutations (I131M, L147I, L147V, L147L, Q235H, G245C). None of the novel mutations were found in the normotensive subjects, and all the residues were conserved in other species. These sequence variants in Chinese population indicate the diversity of the human library and the complexity of hypertension. Conclusions The consistent finding of our present study provided a basis for the development of new strategies to diagnosis and treat hypertension in the elderly.
Glycemic and blood pressure control in older patients with hypertension and diabetes: association with carotid atherosclerosis

Du Hong-Wei,Li Jia-Yue,He Yao,

老年心脏病学杂志(英文版) , 2011,
Abstract: Backgroud Numerous studies have confirmed the effectiveness of slowing the progression of atherosclerosis by blood pressure (Bp)control in patients with hypertension and several studies also showed the efficacy of intensive glycemic control in decreasing progression of carotid intima-media thickness (CIMT) in patients with type 1 and type 2 diabetes. However, few studies have compared the relative importance of glycemic vs. Bp control in patients with diabetes and hypertension. We aimed to investigate the association between Bp and glycemic control and subclinical carotid atherosclerosis in older patients with hypertension and type 2 diabetes. Methods In a cross-sectional study, B-mode high-resolution ultrasonography of the carotid artery was performed in 670 subjects (508 males and 162 females) aged 60 years or over who had self-reported hypertension and diabetes but no history of coronary heart disease or stroke. Subjects were categorized by their systolic blood pressure: tight control, < 130 mmHg; usual control, 130-139 mmHg; or uncontrolled, > 140 mmHg, and by their hemoglobin Alc (HbAlc) level: tight control, < 6.5%; usual control, 6.5%-7.5%; or uncontrolled, > 7.5%, respectively. Results The mean CIMT was 8.20±0.11 mm, and carotid plaque was found in 52.5% (352/670) subjects. Overall, 62.1% of the subjects had subclinical carotid atherosclerosis, defined as having either carotid plaque or elevated CIMT (≥ 1.1 mm). The mean CIMT was significantly different between Bp control categories (7.60 ± 0.09 mm, 7.90 ± 0.08 mm, and 8.60±0.12 nun, respectively, P = 0.03) but not between glycemic control categories (8.20 ± 0.10 ram, 8.1 ± 0.08 mm, and 8.40 ± 0.14 mm, respectively, P = 0.13) using ANCOVA analysis. Multivariable logistic regression adjusting for potential confounding factors showed that usual or uncontrolled Bp control were associated with having carotid plaque (OR = 1.08 and OR = 1.42, respectively), or elevated CIMT Odd ratio (OR) = 1.17, 95% confidence interval (CI)1.04-2.24, and OR = 1.54, 95% CI 1.36-2.96, respectively compared to tight Bp control; but did not show glycemic control as independent predictor of either having carotid plaque or elevated CIMT. Conclusions In older patients with hypertension and diabetes, blood pressure control, but not glycemic control is associated with subclinical carotid atherosclerosis.
Secular trends in the etiology and comorbidity of hospitalized patients with congestive heart failure: A single-center retrospective study
Zhi-Yong Pei,Jia-Yue Li,Qiao Xue,Lei Gao
老年心脏病学杂志(英文版) , 2012,
Abstract: Objective To assess the secular trends in the etiology and comorbidity of patients hospitalized with congestive heart failure (CHF). Methods Data of 7,319 patients (mean age 59.6 years, 62.1% male) with a primary discharge diagnosis of CHF, hospitalized from January 1, 1993 to December 31, 2007 at the Chinese People’s Liberation Army (PLA) General Hospital were extracted and analyzed. These patients were divided into three groups according to hospitalization period: 1993–1997 (n = 1623), 1998–2002 (n = 2444), and 2003–2007 (n = 3252). The etiological characteristics and comorbidities were assessed. Results Over the study period, the proportion of patients with ischemic heart disease (IHD) increased from 37.2% during the period 1993–1997 to 46.8% during the period 2003–2007, while that with valvular heart disease (VHD) decreased from 35.2% during the period 1993–1997 to 16.6% during the period 2003–2007 (both P < 0.05). Atrial fibrillation (AF) was the most common comorbidity of heart failure (23.2%, 23.0% and 20.6%, respectively, in the three periods). Compared to that of the period of 1993–1997 with that of, the proportion of patients with myocardial infarction, pneumonia, renal function impairment and hepatic cirrhosis of the period of 2003–2007 increased significantly (P < 0.05) and the proportion of patients with chronic obstructive pulmonary disease and atrial fibrillation decreased significantly (P < 0.05). Conclusions This study implies that IHD has became a more common etiology of CHF, while VHD has deceased as an etiology of CHF in Chinese patients during the last two decades.
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