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Search Results: 1 - 10 of 127013 matches for " Ruijiang Li "
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Analysis on the Effect of Shading on the Characteristics of Large-scale on-grid PV System in China  [PDF]
Yunlin Sun, Xiangzhi Li, Ruijiang Hong, Hui Shen
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B042
Abstract: Because of rich solar resource and low land cost, a lot of large-scale ground-based grid-connected PV systems have been built in Northwest China. In this paper, some shading phenomena on a grid-connected PV system inNorthwest Chinaare classified and analyzed. Through the I-V curve test of PV modules, it can be seen that dust influence system performance of the grid-connected PV system. And the experimental results have shown that shading could affect the electrical properties of PV modules. Meanwhile, same shading area on different shading positions could have different impacts on the identical PV module.
Groupwise Constrained Reconstruction for Subspace Clustering
Ruijiang Li,Bin Li,Ke Zhang,Cheng Jin,Xiangyang Xue
Computer Science , 2012,
Abstract: Reconstruction based subspace clustering methods compute a self reconstruction matrix over the samples and use it for spectral clustering to obtain the final clustering result. Their success largely relies on the assumption that the underlying subspaces are independent, which, however, does not always hold in the applications with increasing number of subspaces. In this paper, we propose a novel reconstruction based subspace clustering model without making the subspace independence assumption. In our model, certain properties of the reconstruction matrix are explicitly characterized using the latent cluster indicators, and the affinity matrix used for spectral clustering can be directly built from the posterior of the latent cluster indicators instead of the reconstruction matrix. Experimental results on both synthetic and real-world datasets show that the proposed model can outperform the state-of-the-art methods.
GPU-based Fast Cone Beam CT Reconstruction from Undersampled and Noisy Projection Data via Total Variation
Xun Jia,Yifei Lou,Ruijiang Li,William Y. Song,Steve B. Jiang
Physics , 2010, DOI: 10.1118/1.3469447
Abstract: Purpose: Cone-beam CT (CBCT) plays an important role in image guided radiation therapy (IGRT). However, the large radiation dose from serial CBCT scans in most IGRT procedures raises a clinical concern, especially for pediatric patients who are essentially excluded from receiving IGRT for this reason. The goal of this work is to develop a fast GPU-based algorithm to reconstruct CBCT from undersampled and noisy projection data so as to lower the imaging dose. Methods: The CBCT is reconstructed by minimizing an energy functional consisting of a data fidelity term and a total variation regularization term. We developed a GPU-friendly version of the forward-backward splitting algorithm to solve this model. A multi-grid technique is also employed. Results: It is found that 20~40 x-ray projections are sufficient to reconstruct images with satisfactory quality for IGRT. The reconstruction time ranges from 77 to 130 sec on a NVIDIA Tesla C1060 GPU card, depending on the number of projections used, which is estimated about 100 times faster than similar iterative reconstruction approaches. Moreover, phantom studies indicate that our algorithm enables the CBCT to be reconstructed under a scanning protocol with as low as 0.1 mAs/projection. Comparing with currently widely used full-fan head and neck scanning protocol of ~360 projections with 0.4 mAs/projection, it is estimated that an overall 36~72 times dose reduction has been achieved in our fast CBCT reconstruction algorithm. Conclusions: This work indicates that the developed GPU-based CBCT reconstruction algorithm is capable of lowering imaging dose considerably. The high computation efficiency in this algorithm makes the iterative CBCT reconstruction approach applicable in real clinical environments.
Real-time volumetric image reconstruction and 3D tumor localization based on a single x-ray projection image for lung cancer radiotherapy
Ruijiang Li,Xun Jia,John H. Lewis,Xuejun Gu,Michael Folkerts,Chunhua Men,Steve B. Jiang
Physics , 2010, DOI: 10.1118/1.3426002
Abstract: Purpose: To develop an algorithm for real-time volumetric image reconstruction and 3D tumor localization based on a single x-ray projection image for lung cancer radiotherapy. Methods: Given a set of volumetric images of a patient at N breathing phases as the training data, we perform deformable image registration between a reference phase and the other N-1 phases, resulting in N-1 deformation vector fields (DVFs). These DVFs can be represented efficiently by a few eigenvectors and coefficients obtained from principal component analysis (PCA). By varying the PCA coefficients, we can generate new DVFs, which, when applied on the reference image, lead to new volumetric images. We then can reconstruct a volumetric image from a single projection image by optimizing the PCA coefficients such that its computed projection matches the measured one. The 3D location of the tumor can be derived by applying the inverted DVF on its position in the reference image. Our algorithm was implemented on graphics processing units (GPUs) to achieve real-time efficiency. We generated the training data using a realistic and dynamic mathematical phantom with 10 breathing phases. The testing data were 360 cone beam projections corresponding to one gantry rotation, simulated using the same phantom with a 50% increase in breathing amplitude. Results: The average relative image intensity error of the reconstructed volumetric images is 6.9% +/- 2.4%. The average 3D tumor localization error is 0.8 mm +/- 0.5 mm. On an NVIDIA Tesla C1060 GPU card, the average computation time for reconstructing a volumetric image from each projection is 0.24 seconds (range: 0.17 and 0.35 seconds). Conclusions: We have shown the feasibility of reconstructing volumetric images and localizing tumor positions in 3D in near real-time from a single x-ray image.
The structure and properties of ZnS films prepared by chemical bath deposition

LI Zhong
, HUANG Saihao,HONG Ruijiang

- , 2017,
Abstract: 采用化学水浴法制备了ZnS薄膜,并从沉积ZnS薄膜的化学反应原理出发,对其结构和性能进行了综合研究。结果表明:随着沉积时间的增加,ZnS薄膜厚度增加,其光学透过率降低,薄膜的禁带宽度也随之变小,最小值为3.74 eV;而薄膜的粗糙度变化不大,其值在6~9 nm之间。随着反应物浓度的增加,薄膜的光学透过率呈先增加后减小的变化,当反应物浓度过低或过高时,沉积反应都会向同质反应偏移,在薄膜表面生成杂质,导致薄膜不均匀。当沉积时间为120 min,ZnSO4、SC(NH2)2和NH3·H2O的浓度分别为0.03、0.4和4.0 mol/L时,沉积的ZnS薄膜呈均匀致密结构,成分为单一ZnS相,其光学透过率在450 ~ 900 nm波段高于70%
Association of Serum Phosphorus Variability with Coronary Artery Calcification among Hemodialysis Patients
Mengjing Wang, Haiming Li, Li You, Xiaoling Yu, Min Zhang, Ruijiang Zhu, Chuanming Hao, Zhijie Zhang, Jing Chen
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0093360
Abstract: Coronary artery calcification (CAC) is associated with increased mortality in patients on maintenance hemodialysis (MHD), but the pathogenesis of this condition is not well understood. We evaluated the relationship of CAC score (CACs) and variability in serum phosphorus in MHD patients. Seventy-seven adults on MHD at Huashan Hospital (Shanghai) were enrolled in July, 2010. CAC of all the patients were measured by computed tomography and CACs was calculated by the Agatston method at the entry of enrollment. Patients were divided into three categories according to their CACs (0~10, 11~400, and >400). Blood chemistry was recorded every 3 months from January 2008 to July 2010. Phosphorus variation was defined by the standard deviation (SD) or coefficient of variation (CV) and it was calculated from the past records. The ordinal multivariate logistic regression analysis was used to analyze the predictors of CAC. The mean patient age (± SD) was 61.7 years (±11.3) and 51% of patients were men. The mean CACs was 609.6 (±1062.9), the median CACs was 168.5, and 78% of patients had CACs more than 0. Multivariate analysis indicated that female gender (OR = 0.20, 95% CI = 0.07–0.55), age (OR = 2.31, 95% CI = 1.32–4.04), serum fibroblast growth factor 23 (OR = 2.25, 95% CI = 1.31–3.85), SD-phosphorus calculated from the most recent 6 measurements (OR = 2.12; 95% CI = 1.23–3.63), and CV-phosphorus calculated from the most recent 6 measurements (OR = 1.90, 95% CI = 1.16–3.11) were significantly and independently associated with CACs. These associations persisted for phosphorus variation calculated from past 7, 8, 9, 10, and 11 follow-up values. Variability of serum phosphorus may contribute significantly to CAC and keeping serum phosphorus stable may decrease coronary calcification and associated morbidity and mortality in MHD patients.
Development of a finite-element-based design sensitivity analysis for buckling and postbuckling of composite plates
Ruijiang Guo,Aditi Chattopadhyay
Mathematical Problems in Engineering , 1995, DOI: 10.1155/s1024123x95000160
Development of a finite-element-based design sensitivity analysis for buckling and postbuckling of composite plates
Guo Ruijiang,Chattopadhyay Aditi
Mathematical Problems in Engineering , 1995,
Abstract: A finite element based sensitivity analysis procedure is developed for buckling and postbuckling of composite plates. This procedure is based on the direct differentiation approach combined with the reference volume concept. Linear elastic material model and nonlinear geometric relations are used. The sensitivity analysis technique results in a set of linear algebraic equations which are easy to solve. The procedure developed provides the sensitivity derivatives directly from the current load and responses by solving the set of linear equations. Numerical results are presented and are compared with those obtained using finite difference technique. The results show good agreement except at points near critical buckling load where discontinuities occur. The procedure is very efficient computationally.
Pathogenic infection of Macaca nemestrina with a CCR5-tropic subtype-C simian-human immunodeficiency virus
On Ho, Kay Larsen, Patricia Polacino, Yun Li, David Anderson, Ruijiang Song, Ruth M Ruprecht, Shiu-Lok Hu
Retrovirology , 2009, DOI: 10.1186/1742-4690-6-65
Abstract: Plasma and cell-associated virus was detectable in peripheral blood and intestinal tissues of all four pig-tailed macaques following intrarectal inoculation with SHIV-1157ipd3N4. We also observed a rapid and irreversible loss of CD4+ T cells at multiple mucosal sites, resulting in a marked decrease of CD4:CD8 T cell ratios 0.5–4 weeks after inoculation. This depletion targeted subsets of CD4+ T cells expressing the CCR5 coreceptor and having a CD28-CD95+ effector memory phenotype, consistent with the R5-tropism of SHIV-1157ipd3N4. All three animals that were studied beyond the acute phase seroconverted as early as week 4, with two developing cross-clade neutralizing antibody responses by week 24. These two animals also demonstrated persistent plasma viremia for >48 weeks. One of these animals developed AIDS, as shown by peripheral blood CD4+ T-cell depletion starting at 20 weeks post inoculation.These findings indicate that SHIV-1157ipd3N4-induced pathogenesis in pig-tailed macaques followed a similar course as SIV-infected rhesus macaques. Thus, R5 SHIV-C-infection of pig-tailed macaques could provide a useful and relevant model for AIDS vaccine and pathogenesis research.The research of AIDS pathogenesis has been facilitated by the use of Asian macaques known to develop AIDS-like diseases from lentivirus infection, including rhesus (M. mulatta), cynomolgus (M. fascicularis), and pig-tailed (M. nemestrina) macaques [1-11]. Studies in rhesus macaques have provided extensive insight into the biology of disease-susceptible animals to advance ongoing efforts towards developing an effective human AIDS vaccine. On the other hand, much less is known about the early events after lentiviral infection in other macaque species, including pig-tailed macaques.The species/subspecies of macaques used in a study can be a significant determinant of viral infectivity and disease susceptibility. For example, in a comparative study of Asian macaques infected intravenously with simian i
The Basic Model and Its Peculiarity of Relaxation Theory in Chromatography

Zhang Weibing,Xu Guowang,Li Ruijiang,Zhang Yukui,

色谱 , 1999,
Abstract: According to the basic idea of relaxation theory in chemical dynamics and the moving character of the sample molecules in a chromatographic column, a new transfer model was established. It was supposed that solute molecules were in equilibrium between the stationary phase and mobile phase, and transferred in the mobile phase by a way of jumping. The generating function was used to investigate the non-continuous dynamic transfer differential equations, and the basic profile of solute's distribution in the column is gained formula: see text] Based on this equation, the effect of transfer coefficient on the profile had been explained. The results show that relaxation time is an important factor which is related to the capacity factor and diffusion coefficient, and the number of jumping is a similar parameter to the plate number. The digital calculation method was used to study the influence of different physical parameters on the profile. The continuous form of the profile was also compared with the one from other methods.
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