检索结果-南通市图书馆

Synthesis and Crystal Structure of 3,6-Bis(4,4,4-trifluorobutane-1,3-dione)-9-n-butylcarbazole

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2008年第2期27卷 143-148页

作者： YANG Lina ZHAO Xiang-hua ZHOU Hong-ping WU Jie-Ying YANG jia-Xiang SHAO Guo-Quan CHENG Le-hua TIAN Yu-Peng Department of Chemistry Anhui University Hefei 230039 China Department of Chemistry Hefei University Hefei 230022 China

A novel bis（β-diketonate） derivate, 3,6-bis（4,4,4-trifluorobutane-1,3-dione）-9-n- butylcarbazole 1, was synthesized and structurally characterized by single-crystal X-ray diffrac- tion. The crystal belongs to the monoclinic system, space group P2 1/c with a = 10.961（6）, b = 22.942（13）, c = 9.408（6）A, α = 90, β = 109.663（9）, y = 90°, V = 2228（2）A^3, Z = 4, Dc = 1.489 g/cm^3, C24H19F6NO4, Mr = 499.40, F（000） = 1024 and μ = 0.134 mm^-1. The structure was refined to the final R = 0.0699 and wR = 0.1627 for 3744 independent reflections （Rint = 0.1288） and 1349 observed reflections （I 〉 2σ（I））. Compound 1 consists of carbazole unit and two terminal diketonate groups, in which carbazole and its two adjacent diketonate rings are almost coplanar. Moreover, compound 1 was characterized with IR, elemental analysis, IH NMR, MS, electronic absorption, and single-photon fluorescence.

关键词： crystal structure bis(β-diketonate) carbazole derivates synthesis,characterization

Primary parenchymal squamous cell carcinoma of the kidney:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第4期13卷 34-40页

作者： Zhi-Hui Zheng Bo Shao Chao-Min Xu Ke Wang jia-Zhu Wen Li-Kang Luo jia-Cheng Guan Department of Ultrasound The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Radiology Shulan(Quzhou)HospitalQuzhou 324000Zhejiang ProvinceChina Department of Radiology The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Pathology The Second people’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina

BACKGROUND Primary squamous cell carcinoma(SCC)of the renal parenchyma is extremely rare,with only nine cases *** SUMMARY This study reports a 51-year-old man with primary SCC of the renal *** patient was admitted with recurrent dull pain and discomfort in the right lumbar region,which had worsened over 2 weeks,accompanied by painful gross *** antigen(SCCA)levels were elevated,and imaging revealed a renal mass with associated *** patient underwent laparoscopic unilateral nephrectomy and lymph node *** pathology confirmed highly differentiated SCC with necrosis in the right renal parenchyma,with negative renal pelvis and *** pathological stage was *** months after surgery,the tumor recurred with involvement of the liver,right psoas major muscle,and inferior vena *** patient refused chemotherapy and succumbed to the disease 6 months postoperatively due to disease *** We report a case of primary SCC of the renal parenchyma,a rare renal *** clinical symptoms,laboratory tests,and imaging findings are nonspecific,making accurate and timely diagnosis *** to the literature,for patients with renal calculi accompanied by a renal mass,elevated serum SCCA levels,and magnetic resonance imaging showing cystic or cystic-solid masses within the kidney with pseudocapsules and heterogeneous mild enhancement,the possibility of this disease should be considered.

关键词： Renal tumor Renal parenchyma Squamous cell carcinoma Renal calculi Computed tomography Case report

Constraints on axion-like particles with different magnetic field models from the PKS 2155–304 energy spectrum

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第10期19卷 152-158页

作者： jia Bu Ya-ping Li Department of Astronomy Xiamen University Xiamen 361005 China Shanghai Astronomical Observatory Shanghai 200030 China

Axion-like particles(ALPs) are a promising kind of dark matter candidate particle that are predicted to couple with photons in the presence of magnetic fields. The oscillations between photons and ALPs traveling in the magnetic fields have been used to constrain ALP properties. In this work, we obtain some new constraints on the ALP mass ma and the photon-ALP coupling constant g with two different magnetic field models through TeV photons from PKS 2155–304. The first is the discrete-Φ model in which the magnetic field has the orientation angle Φ that changes discretely and randomly from one coherent domain to the next, and the second is the linearly-continuous-Φ model in which the magnetic field orientation angle Φ varies continuously across neighboring coherent domains. For the discrete-Φ model, we can obtain the best constraints on the ALP mass m1 = ma/(1 neV)= 0.1 and on the photon-ALP coupling constant g11= g/(10^-11 GeV^-1)= 5. The reasonable range of the ALP mass m1 is 0.08 ~ 0.2 when g11 = 5,and the only reasonable value of the photon-ALP coupling constant is g11 = 5 when m1 = 0.1. For the linearly-continuous-Φ model, we can obtain the best constraints on the ALP mass m1 = 0.1 and on the photon-ALP coupling constant g11 = 0.7. The reasonable range of the ALP mass m1 is 0.05 ~ 0.4 when g11= 0.7, and the reasonable range of the photon-ALP coupling constant g11 is 0.5 ~ 1 when m1 = *** of the results are consistent with the upper bound(g < 6.6 × 10^-11 GeV^-1, i.e., g11 < 6.6) set by the CAST experiment.

关键词： cosmology dark matter-gamma rays general-galaxies magnetic fields

Expression and significance of mi R-654-5p and mi R-376b-3p in patients with colon cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2020年第4期12卷 492-502页

作者： ping Li jia-Xun Cai Fei Han Jie Wang jia-Jie Zhou Kai-Wen Shen Liu-hua Wang Department of Central Laboratory Huaian Tumor Hospital&Huaian Hospital of Huaian CityHuaian 223200Jiangsu ProvinceChina Department of General Surgery Huaian Tumor Hospital&Huaian Hospital of Huaian CityHuaian 223200Jiangsu ProvinceChina Department of Anorectal Clinical Medical College of Yangzhou University and Northern Jiangsu People’s HospitalYangzhou 225001Jiangsu ProvinceChina Clinical Medical College Yangzhou UniversityYangzhou 225009Jiangsu ProvinceChina Department of General Surgery General Surgery Institute of YangzhouNorthern Jiangsu Province HospitalClinical Medical CollegeYangzhou UniversityYangzhou 225001Jiangsu ProvinceChina

BACKGROUND The relationship between micro RNAs,such as miR-654-5 p and miR-376 b-3 p,and the prognosis of colon cancer has not been studied until *** To evaluate the expression levels of miR-654-5 p and miR-376 b-3 p and their clinical significance in colon *** RT-q PCR was performed to evaluate miR-654-5 p and miR-376 b-3 p expression in34 pairs of colon cancer and adjacent noncancerous ***,the association of miR-654-5 p and miR-376 b-3 p expression with clinical factors or the survival of patients suffering from colon cancer was determined by using The Cancer Genome *** miR-654-5 p was upregulated and miR-376 b-3 p was downregulated in colon cancer tissues compared with adjacent noncancerous tissues(P<0.001).Increased miR-654-5 p and decreased miR-376 b-3 p expression levels weresignificantly associated with metastasis and clinical ***,a univariate analysis demonstrated that colon cancer patients with high miR-654-5 p or low miR-376 b-3 p expression(P=0.044 and 0.007,respectively)had a poor overall survival rate.A multivariate analysis identified high miR-654-5 p expression and low miR-376 b-3 p expression as independent predictors of poor survival in colon cancer *** Upregulated miR-654-5 p and downregulated miR-376 b-3 p may be associated with tumour progression in colon cancer,and these micro RNAs may serve as independent prognostic markers for colon cancer.

关键词： Colorectal cancer Colon cancer Rectal cancer MiR-654-3p MiR-376b-5p Prognosis Survival The Cancer Genome Atlas

A Fuzzy Neural Network Based Dynamic Data Allocation Model on Heterogeneous Multi-GPUs for Large-scale Computations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2018年第2期15卷 181-193页

作者： Chao-Long Zhang Yuan-ping Xu Zhi-Jie Xu jia He Jing Wang jian-hua Adu School of Software Engineering Chengdu University of Information Technology School of Computing & Engineering University of Huddersfield School of Computer Science Chengdu University of Information Technology Department of Computing Sheffield Hallam University

The parallel computation capabilities of modern graphics processing units （GPUs） have attracted increasing attention from researchers and engineers who have been conducting high computational throughput studies. However, current single GPU based engineering solutions are often struggling to fulfill their real-time requirements. Thus, the multi-GPU-based approach has become a popular and cost-effective choice for tackling the demands. In those cases, the computational load balancing over multiple GPU ＂nodes＂ is often the key and bottleneck that affect the quality and performance of the real=time system. The existing load balancing approaches are mainly based on the assumption that all GPU nodes in the same computer framework are of equal computational performance, which is often not the case due to cluster design and other legacy issues. This paper presents a novel dynamic load balancing （DLB） model for rapid data division and allocation on heterogeneous GPU nodes based on an innovative fuzzy neural network （FNN）. In this research, a 5-state parameter feedback mechanism defining the overall cluster and node performance is proposed. The corresponding FNN-based DLB model will be capable of monitoring and predicting individual node performance under different workload scenarios. A real=time adaptive scheduler has been devised to reorganize the data inputs to each node when necessary to maintain their runtime computational performance. The devised model has been implemented on two dimensional （2D） discrete wavelet transform （DWT） applications for evaluation. Experiment results show that this DLB model enables a high computational throughput while ensuring real=time and precision requirements from complex computational tasks.

关键词： Heterogeneous GPU cluster dynamic load balancing fuzzy neural network adaptive scheduler discrete wavelet trans-form.

Invariant Sets and Exact Solutions to Nonlinear Diffusion Equations with x-Dependent Convection and Absorption

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第10期50卷 821-826页

作者： jia hua-Bing XU Wei Department of Applied Mathematics Northwestern Polytechnical University Xi＇an 710072 China Department of Matheinatics Baoji University of Arts and Sciences Baoji 721013 China

In this paper, we introduce a new invariant set Eo={u：ux=f＇（x）F（u）＋ε[g＇（x）-f＇（x）g（x）]F（u）×exp（-∫^u1/F（z）dz）}where f and g are some smooth functions of x, ε is a constant, and F is a smooth function to be determined. The invariant sets and exact sohltions to nonlinear diffusion equation ut = （ D（u）ux）x ＋ Q（x, u）ux ＋ P（x, u）, are discussed. It is shown that there exist several classes of solutions to the equation that belong to the invariant set Eo.

关键词： invariant set exact solution nonlinear diffusion equations rotation group scaling group

Effect of Dietary Resistant Starch on Prevention and Treatment of Obesity-related Diseases and Its Possible Mechanisms

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2015年第4期28卷 291-297页

作者： ZHANG Lei LI hua Ting SHEN Li FANG Qi Chen QIAN Ling Ling jia Wei ping Department of Endocrinology and Metabolism Shanghai Jiao Tong University Affiliated Sixth People’s Hospital Shanghai Diabetes Institute Shanghai Key Laboratory of Diabeties Mellitus Shanghai Clinical Center for Diabetes Department of Medicine Shanghai Jiao Tong University School of Medicine Department of Clinical Nutrition Shanghai Jiao Tong University Affiliated Sixth People’s Hospital

Overweight or obesity has become a serious public health problem in the world, scientists are concentrating their efforts on exploring novel ways to treat obesity. Nowadays, the availabilities of bariatric surgery and pharmacotherapy have enhanced obesity treatment, but it should has support from diet, physical exercise and lifestyle modification, especially the functional food. Resistant starch, an indigestible starch, has been studied for years for its beneficial effects on regulating blood glucose level and lipid metabolism. The aim of this review is to summarize the effect of resistant starch on weight loss and the possible mechanisms. According to numerous previous studies it could be concluded that resistant starch can reduce fat accumulation, enhance insulin sensitivity, regulate blood glucose level and lipid metabolism. Recent investigations have focused on the possible associations between resistant starch and incretins as well as gut microbiota. Resistant starch seems to be a promising dietary fiber for the prevention or treatment of obesity and its related diseases.

关键词： GLP Effect of Dietary Resistant Starch on Prevention and Treatment of Obesity-related Diseases and Its Possible Mechanisms PYY RS body

Experimental research on dryout point of flow boiling in narrow annular channels

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2006年第4期17卷 252-256页

作者： WU Ge-ping QIU Sui-Zheng SU Guang-Hui jia Dou-Nan LU Dong-hua State Key Laboratory of Multiphase Flow in Power Engineering Xi＇an Jiaotong University Xi＇an 710049 China Reactor Engineering Research Division Nuclear Power Institute of China Chengdu 610041 China

An experimental research on the dryout point of flow boiling in narrow annular channels under low mass flux with 1.55 mm and 1.05 mm annular gap, respectively, is conducted. Distilled water is used as working fluid and the range of pressure is limited within 2.0∼4.0 MPa and that of mass flux is 26.0∼69.0 kg·m −2 ·s −1 . The relation of critical heat flux (CHF) and critical qualities with mass flux and pressure are revealed. It is found that the critical qualities decrease with the increasing mass flux and increase with the increasing inlet qualities in externally heated annuli. Under the same conditions, critical qualities in the outer tube are always larger than those in the inner tube. The appearance of dryout point in bilaterally heated narrow annuli can be judged according to the ratio of q o / q i .

关键词：临界热通量流动沸腾干燥核沸腾狭窄环形通道

Adaptive command filter constraint control of rolling mill torsional vibration under current harmonic

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第9期30卷 1782-1791页

作者： Shu-zong Chen Cheng jia Chang-chun hua jia-qiang Chen Institute of Electrical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

An adaptive command filter control strategy was proposed to realize the asymptotic tracking of the roll speed,which successfully suppressed torsional vibration for the main drive system of the rolling mill with nonlinear friction,nonlinear damping,current harmonic,time-varying stiffness and unknown disturbance.A finite time predetermined performance method was proposed,so that the speed tracking error of the main transmission system was always constrained in the performance function and converged to its minimum boundary within the specified *** on the adaptive estimation of harmonic amplitude,the torque control law of the motor was obtained by using the filter backstepping method,which prevented the torsional vibration of the system caused by the input fluctuation and avoided the complexity explosion of the controller design,and the stability of the closed-loop system was strictly proved by the Lyapunov *** actual numerical simulation verified the effectiveness of the proposed control strategy.

关键词： Main drive system Torsional vibration Command filter Finite time predetermined performance