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Search Results: 1 - 10 of 28437 matches for " Jichao Sun "
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Crack spacing of unsaturated soils in the critical state
JiChao Sun,GuangQian Wang,QiCheng Sun
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0319-8
Abstract: The cracking mechanism of unsaturated soils due to evaporation is poorly understood, and the magnitude of crack spacing is usually hard to estimate. In this work, cracks were postulated to occur succedently rather than simultaneously, that is, secondary cracks appear after primary cracks as evaporation continues. Formulae of the secondary crack spacing and secondary trend crack spacing were then derived after stress analysis. The calculated spacing values were consistent with the published experimental data. Meanwhile, the effect of the Poisson ratio on the crack spacing was analyzed, which showed that the magnitude of crack spacing was proportional to the Poisson ratio in the range of [0.30, 0.35].
Crack spacing of unsaturated soils in the critical state

JiChao Sun,GuangQian Wang,QiCheng Sun,

科学通报(英文版) , 2009,
Abstract: The cracking mechanism of unsaturated soils due to evaporation is poorly understood, and the magnitude of crack spacing is usually hard to estimate. In this work, cracks were postulated to occur succedently rather than simultaneously, that is, secondary cracks appear after primary cracks as evaporation continues. Formulae of the secondary crack spacing and secondary trend crack spacing were then derived after stress analysis. The calculated spacing values were consistent with the published experimental data. Meanwhile, the effect of the Poisson ratio on the crack spacing was analyzed, which showed that the magnitude of crack spacing was proportional to the Poisson ratio in the range of 0.30, 0.35]. Supported by the National Natural Science Foundation of China (Grant No. 50709015), China Postdoctoral Science Special Foundation (Grant No. 200801081), China Postdoctoral Science Foundation (Grant No. 20070410531) and National Basic Research Program of China (Grant No. 2007CB714100)
Low Serum Magnesium Level Is Associated with Microalbuminuria in Chinese Diabetic Patients
Baihui Xu,Jichao Sun,Xinru Deng,Xiaolin Huang,Wanwan Sun,Yu Xu,Min Xu,Jieli Lu,Yufang Bi
International Journal of Endocrinology , 2013, DOI: 10.1155/2013/580685
Abstract: Whether serum magnesium deficiency is independently associated with the prevalence of microalbuminuria is still unclear. The objective of the present study was to elucidate the association between serum magnesium and microalbuminuria in diabetic patients. A cross-sectional study was conducted in 1829 diabetic subjects (aged ≥ 40 years) from Shanghai, China. Subjects were divided into three groups according to serum magnesium tertiles. A first-voided early-morning spot urine sample was obtained for urinary albumin-creatinine ratio (UACR) measurement. Microalbuminuria was defined as 30?mg/g ≤ UACR < 300?mg/g. Overall, 208 (11.37%) of the study population had microalbuminuria, with similar proportions in both genders ( ). The prevalence of microalbuminuria in tertile 1 of serum magnesium was higher than the prevalence in tertile 2 and tertile 3 (15.98%, 9.72%, and 8.46%, resp.; for trend <0.0001). After adjustment for age, sex, BMI, blood pressure, lipidaemic profile, HbA1c, eGFR, history of cardiovascular disease, HOMA-IR, antihypertensive and antidiabetic medication, and diabetes duration, we found that, compared with the subjects in tertile 3 of serum magnesium, those in tertile 1 had 1.85 times more likeliness to have microalbuminuria. We concluded that low serum magnesium level was significantly associated with the prevalence of microalbuminuria in middle-aged and elderly Chinese. 1. Introduction Magnesium (Mg) is the fourth most abundant cation in the human body and is a critical cofactor in many enzymatic reactions [1, 2]. It plays an important role in many fundamental biological processes. Mg depletion is a common feature in diabetic patients [3, 4]. An Australian study demonstrated that hypomagnesaemia was 10.51-fold more common between patients with new diabetes and 8.63-fold more common between patients with known diabetes as compared with control subjects without diabetes [3]. In another large cohort of young American adults participating in the Coronary Artery Risk Development in Young Adults (CARDIA) study, it was shown that Mg intake was inversely longitudinally associated with the incidence of diabetes [4]. Microalbuminuria was first reported in diabetic patients by Viberti et al. in 1982 [5]. It has been shown to be associated with increased risk of cardiovascular morbidity and mortality in diabetic patients [6]. Furthermore, the presence of microalbuminuria is generally associated with a poorer glycometabolic control and a higher prevalence of chronic complications including diabetic retinopathy, peripheral vascular disease, and diabetic
Low-Grade Albuminuria Is Associated with Metabolic Syndrome and Its Components in Middle-Aged and Elderly Chinese Population
Jie Zhang, Yuhong Chen, Yu Xu, Mian Li, Tiange Wang, Baihui Xu, Jichao Sun, Min Xu, Jieli Lu, Yufang Bi
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0065597
Abstract: Background Micro-albuminuria has been well established as one of the risk factors of metabolic syndrome (MetS). However, the association of MetS and its components with low-grade albuminuria among those with normal urinary albumin excretion has not been clearly elucidated in Chinese population. Methodology and Findings A cross-sectional study was conducted among 9,579 participants with normal urinary albumin excretion, who were recruited from Jia Ding District, Shanghai, China. The single-void first morning urine sample was collected for urinary albumin and creatinine measurements, and urinary albumin-to-creatinine ratio (UACR) was calculated as urinary albumin divided by creatinine. Low-grade albuminuria was classified as sex-specific upper UACR quartile in this population. MetS was defined according to the National Cholesterol Education Program Adult Treatment Panel III criteria. The prevalence of MetS and its components increased across the UACR quartiles (all P trend <0.01). A multivariable adjusted logistic regression analysis revealed that the prevalence of MetS was gradually elevated according to the UACR quartiles (adjusted odds ratios [ORs] were 1.14, 1.24 and 1.59 for UACR quartiles 2, 3 and 4, compared with the lowest quartile; P trend<0.0001). In the further stratified logistic regression analyses, the associations between low-grade albuminuria and MetS were significant in both sex strata (male and female), both age strata (<60 and ≥60 years), both body mass index strata (<24 and ≥24 kg/m2), and both diabetes strata (yes and no). Compared to the lowest UACR quartile, the participants in the highest quartile of UACR had the highest prevalence of central obesity (OR = 1.43; 95%CI = 1.25–1.63), high blood pressure (OR = 1.64; 95%CI = 1.43–1.87), hyperglycemia (OR = 1.52; 95%CI = 1.30–1.78) and high triglycerides (OR = 1.19; 95%CI = 1.04–1.37). Conclusions and Significance Low-grade albuminuria was significantly associated with the increasing prevalence of MetS and its components in the middle-aged and elderly Chinese population with normal urinary albumin excretion.
Data Dependencies in Database with Incomplete Information
Zhang Yan,He Jichao
计算机科学技术学报 , 1988,
Abstract: To get more meaning of incomplete information,a predicate way is proposed torepresent the nulls.The concepts of functional and multivalued dependencies areextended in the environment which allows nulls in a database relation.The inferencerules which can be applied to the extended dependencies are investigated.Finally it isshown that the rules are complete for the family of extended functional and multivalueddependencies.
Eosinophil Inversely Associates with Type 2 Diabetes and Insulin Resistance in Chinese Adults
Liying Zhu, Tingwei Su, Min Xu, Yu Xu, Mian Li, Tiange Wang, Jichao Sun, Jie Zhang, Baihui Xu, Jieli Lu, Yufang Bi, Weiqing Wang, Yiping Xu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0067613
Abstract: Context Limited population-based study focused on relationship between eosinophil and type 2 diabetes (T2D). Objectives We aimed to evaluate the relationship between peripheral eosinophil percentage and glucose metabolism and insulin resistance in a large sample size of Chinese population aged 40 and older. Design and Methods A cross-sectional study was performed among 9,111 Chinese adults including 3,561 men and 5,550 women. The glucose metabolism status was confirmed by 75-g oral glucose tolerance test. Homeostasis model assessment of insulin resistance index and serum insulin levels were used to evaluate insulin resistance. Homeostasis model assessment-B was used to evaluate β cell function. Results The average age of participants was 58.5 years. The prevalence of T2D decreased across the tertiles of eosinophil percentage (21.3%, 18.2% and 16.9%, P<0.0001). Each one tertile increase of eosinophil percentage inversely associated with risk of T2D when referred not only to normal glucose tolerance (NGT) (odds ratio (OR) 0.81, 95% CI 0.76–0.87, P< 0.0001), but also to impaired glucose regulation (OR 0.89, 95% CI 0.83–0.97, P = 0.006), respectively, after adjustment for the confounding factors. Compared with the first tertile, the third tertile of eosinophil percentage associated with a 23% decrease of insulin resistance in NGT participants after full adjustments (P = 0.005). Each 1-standard deviation of increment of eosinophil percentage associated with a 37% decrease of insulin resistance (P = 0.005). Conclusions Higher peripheral eosinophil percentage was associated with decreased risk of T2D. The inverse relation to insulin resistance was detected in NGT participants.
Integrin Beta 1 Suppresses Multilayering of a Simple Epithelium
Jichao Chen, Mark A. Krasnow
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0052886
Abstract: Epithelia are classified as either simple, a single cell layer thick, or stratified (multilayered). Stratified epithelia arise from simple epithelia during development, and transcription factor p63 functions as a key positive regulator of epidermal stratification. Here we show that deletion of integrin beta 1 (Itgb1) in the developing mouse airway epithelium abrogates airway branching and converts this monolayer epithelium into a multilayer epithelium with more than 10 extra layers. Mutant lung epithelial cells change mitotic spindle orientation to seed outer layers, and cells in different layers become molecularly and functionally distinct, hallmarks of normal stratification. However, mutant lung epithelial cells do not activate p63 and do not switch to the stratified keratin profile of epidermal cells. These data, together with previous data implicating Itgb1 in regulation of epidermal stratification, suggest that the simple-versus-stratified developmental decision may involve not only stratification inducers like p63 but suppressors like Itgb1 that prevent simple epithelia from inappropriately activating key steps in the stratification program.
In situ remediation of leachate-polluted groundwater with permeable reactive barrier technique
可渗透反应墙原位修复垃圾渗滤液污染地下水

Cui Haiwei,Sun Jichao,Zhang Ying,Wang Jincui,Huang Guanxing,Liu Jingtao,Wen Jili,
崔海炜
,孙继朝,张英,王金翠,黄冠星,刘景涛,温吉利

环境工程学报 , 2012,
Abstract: 实验模拟地下环境,以垃圾渗滤液污染地下水为研究对象,分别采用沸石、无烟煤、陶粒、活性炭、炉渣、粉煤灰和零价铁作为填充材料,设计了7种地下可渗透反应器(PRB)。分2个阶段对PRB技术治理污染地下水可行性和有效性进行实验模拟研究,还研究了填充材料配比对PRB修复效率影响,分阶段调整复合填充材料配比,观察反应器产生的不同处理效果。考察了7种反应器内pH、EC和DO的变化情况及对污染物去除效果影响,分析了污染物去除机理;找出了反应器存在的某些不足之处。实验结果显示,2个阶段反应器对COD去除率都较高,分别为82.36%~88.11%和89.45%~93.65%。
Oscillation Criteria for a Class of Second-Order Nonlinear Differential Equations with Damping Term
Zigen Ouyang,Jichao Zhong,Shuliang Zou
Abstract and Applied Analysis , 2009, DOI: 10.1155/2009/897058
Abstract: A class of second-order nonlinear differential equations with damping term(()|()|?1())
A New Analytical Model for High Heat Flux in Pool Boiling
Guoping Jiang,Boqi Xiao,Jichao Liu
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: In this study, first the empirical correlations and primary models of Critical Heat Flux (CHF) are introduced, then a new fractal model for critical heat flux is proposed. Algebraic expressions for the fractal dimension of nucleation sites are derived based on the fractal distribution of nucleation sites, which are shown to be a strong function of wall superheat. The new fractal model for critical heat flux is found to be a function of wall superheat. The contact angel of the fluid and the physical properties of the fluid and empirical constant have an important effect on critical heat flux. It turns out that the present model well explains the mechanism on how parameter such as surface wettability influences CHF. The present model shows the surface wettability plays no significant role. The expressions of active nucleation site are applies to CHF which are predicted in the proposed model quantitatively. The predicted critical heat flux from a boiling surface based on the proposed fractal model is compared with existing experimental data. An excellent agreement between the new model predictions and experimental data is found. The validity of the new fractal model is thus verified.
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