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Imaging features of solid pseudopapillary tumor of the pancreas on multi-detector row computed tomography

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World Journal of Gastroenterology 2009年第7期15卷 829-835页

作者： Deng-Bin wang qing-bing wang Wei-Min Chai Ke-Min Chen Xia-Xing Deng Department of Radiology Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200025 China Department of General Surgery Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200025 China

AIM： To retrospectively analyze the imaging features of solid-pseudopapillary tumors （SPTs） of the pancreas on multi-detector row computed tomography （MDCT） and define the imaging findings suggestive of malignant potential. METHODS： A total of 24 consecutive cases with surgically and pathologically confirmed SPTs of the pancreas underwent preoperative abdominal MDCT studies in our hospital. All axial CT images, CT angiographic images, and coronally and sagittally reformed images were obtained. The images were retrospectively reviewed at interactive picture archiving and communication system workstations. RESULTS： Of the 24 cases of SPTs, 11 cases （45.8%） occurred in the pancreatic head and seven （29.1%） in the tail. Eighteen were pathologically diagnosed as benign and six as malignant. MDCT diagnosis of SPTs was well correlated with the surgical and pathological results （Kappa = 0.6, P 〈 0.05）. The size of SPTs ranged from 3 to 15 cm （mean, 5.8 cm）. When the size of the tumor was greater than 6 cm （including 6 cm）, the possibilities of vascular （8 vs 1） and capsular invasion （9 vs 0） increased significantly （P 〈 0.05）.Two pathologically benign cases with vascular invasion and disrupted capsule on MDCT presented with local recurrence and hepatic metastases during follow-up about 1 year after the resection of the primary tumors. CONCLUSION： Vascular and capsular invasion with superimposed spread into the adjacent pancreatic parenchyrna and nearby structures in SPTs of the pancreas can be accurately revealed by MDCT preoperatively. These imaging findings are predictive of the malignant potential associated with the aggressive behavior of the tumor, even in the pathologically benign cases.

关键词： Solid pseudopapillary tumor Pancreas Multi-detector row computed tomography Malignantpotential Aggressive behaviors

Imaging features of intraductal papillary mucinous neoplasms of the pancreas in multi-detector row computed tomography

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World Journal of Gastroenterology 2009年第32期15卷 4037-4043页

作者： Ling Tan Ya-E Zhao Deng-Bin wang qing-bing wang Jing Hu Ke-Min Chen Xia-Xing Deng Department of Radiology Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200025 China Department of Radiology Shanghai Shi Dong Hospital Shanghai 200438 China Jiao Tong University School of Medicine Department of General Surgery RuijinHospital ShanghaiShanghai 200025 China

AIM:To retrospectively evaluate the imaging features of pancreatic intraductal papillary mucinous neoplasms (IPMNs) in multi-detector row computed tomography (MDCT).METHODS: A total of 20 patients with pathologically-confirmed intraductal papillary mucinous neoplasms (IPMNs) were included in this study. Axial MDCT images combined with CT angiography (CTA) and multiplanar volume reformations (MPVR) or curved reformations (CR) were preoperatively acquired. Two radiologists (Tan L and wang DB) reviewed all the images in consensus using an interactive picture archiving and communication system. The disputes in readings were resolved through consultation with a third experienced radiologist (Chen KM). Finally, the findings and diagnoses were compared with the pathologic ***: The pathological study revealed 12 malignant IPMNs and eight benign IPMNs. The diameters of the cystic lesions and main pancreatic ducts (MPDs) were significantly larger in malignant IPMNs compared with those of the benign IPMNs (P<0.05). The combined-type IPMNs had a higher rate of malignancy than the other two types of IPMNs (P<0.05). Tumors with mural nodules and thick septa had a significantly higher incidence of malignancy than tumors without these features (P<0.05). Communication of side-branch IPMNs with the MPD was present in nine cases at pathologic examination. Seven of them were identified from CTA and MPVR or CR images. From comparison with the pathological diagnosis, the sensitivity, specificity, and accuracy of MDCT in characterizing the malignancy of IPMN of the pancreas were determined to be 100%, 87.5% and 95%, ***: MDCT with CTA and MPVR or CR techniques can elucidate the imaging features of IPMNs and help predict the malignancy of these tumors.

关键词： Computed tomography Diagnostic imaging Intraductal papillary mucinous neoplasm Pancreaticneoplasms

基于幂律流体模型的非牛顿流体对斯特封密封行为影响的仿真研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第11期19卷 824-842页

作者： bing-qing wang Xu-dong PENG Xiang-kai MENG College of Mechanical Engineering Zhejiang University of Technology

目的:研究润滑油的非牛顿流体行为对液压往复活塞杆的斯特封密封性能的影响,为密封设计提供理论参考。创新点:1.基于幂律流体模型和JFO空化理论,推导出同时考虑粗糙度、流体空化和非牛顿流体效应的修正雷诺方程;2.建立非牛顿流体的混合... 详细信息

目的:研究润滑油的非牛顿流体行为对液压往复活塞杆的斯特封密封性能的影响,为密封设计提供理论参考。创新点:1.基于幂律流体模型和JFO空化理论,推导出同时考虑粗糙度、流体空化和非牛顿流体效应的修正雷诺方程;2.建立非牛顿流体的混合润滑软弹流模型,探究流体流变属性对斯特封密封行为及性能的影响。方法:1.通过理论推导,建立混合润滑条件下非牛顿流体的软弹流仿真模型;2.对比分析不同工况条件下假塑性(n1)两种典型非牛顿流体和牛顿流体(n=1)对斯特封密封行为影响的区别,揭示假塑性和膨胀型两种非牛顿流体的密封机理。结论:1.非牛顿流体效应对液压往复斯特封密封性能具有重要影响:幂律指数越大,流体的动压效应越强,密封性能越好。2.相比于牛顿流体,膨胀型流体润滑条件较好,密封具有低摩擦低泄漏的优点;假塑性流体润滑条件较差,密封摩擦力较大,不易实现零泄漏。

关键词：非牛顿流体幂律流体斯特封软弹流

H_2SO_4-SiO_2:Highly efficient and novel catalyst for the Ferrier-type glycosylation

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Chinese Chemical Letters 2010年第8期21卷 922-926页

作者： Jia Fen Zhou Xuan Chen qing bing wang Bo Zhang Li Yah Zhang Abdullah Yusulf Zhong Fu wang Jian Bo Zhang Jie Tang Department of Chemistry East China Normal University Shanghai 200062 China School of Life Sciences Northwestern University Xi'an 710069 China

Sulfuric acid immobilized on silica gel is designed as a very useful catalyst for synthesis of 2,3-unsaturated glycopyranosides. This handy,metal-free,environment friendly transformation provides high yields andα-ste... 详细信息

关键词： Glycosylation H2SO4-SiO2 Ferrier rearrangement O-glycosides

Increased expression of granulocyte colony-stimulating factor mediates mesenchymal stem cells recruitment after vascular injury

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Chinese Medical Journal 2011年第24期124卷 4286-4292页

作者： ZHAO Yong LIU Ying-xi XIE Shuang-lun DENG bing-qing wang Jing-feng NIE Ru-qiong Department of Cardiology Sun Yat-sen Memorial Hospital SunYat-sen University Guangzhou Guangdong 510120 China

Background Recent studies indicate that bone marrow-derived cells may significantly contribute to atherosclerosis, post-angioplasty restenosis and transplantation-associated vasculopathy. The responsible bone marrow （BM） cells and mechanisms regulating the mobilization of these cells are currently unclear. The purpose of this study was to investigate the expression of granulocyte colony-stimulating factor （G-CSF） on injured arteries and its effects on mesenchymal stem cells （MSCs） differentiation into vascular smooth muscle cells （VSMCs） in the process of vascular remodeling. Methods Balloon-mediated vascular injury was established in female rats （n=100） which received radioprotective whole female BM cells by tail vein injection and male MSCs through a tibial BM injection after lethal irradiation. The injured and contralateral carotid arteries were harvested at 3, 7, 14 and 28 days after treatment. Results Morphometric analysis indicated that intima to media area-ratio （I/M ratio） significantly increased at 28 days, 0.899＋0.057 （P 〈0.01）, compared with uninjured arteries. Combining fluorescence in situ hybridization （FISH） and immunohistochemical analysis showed that a significant number of the neointimal cells derived from MSCs, （45.2~8.5）% at 28 days （P=0.01）, compared with （23.5~6.3）% at 14 days. G-CSF was induced in carotid arteries subject to balloon angioplasty （fold mRNA change=8.67＋0.63 at three days, relative G-CSF protein=0.657±0.011 at three days, P 〈0.01, respectively, compared with uninjured arteries）. G-CSF was chemotactic for MSCs but did not affect the differentiation of MSCs into smooth-muscle-like cells. Conclusion Increased expression of G-CSF by injured arteries plays an essential role in contribution to recruitment and homing of MSCs to the site of the arterial lesion.

关键词： mesenchymal stem cells smooth muscle cells granulocyte colony-stimulating factor neointima

An anti-aging skin strategy:promoting repair and regeneration in UV-induced photoaging micro-environment using growth factors-rich platelet lysates composite Self-protection Collagen Hydrogel

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Biomedical Engineering Communications 2023年第2期2卷 7-17页

作者： Jian-Peng Zhang Zi-Duo Huang bing-qing wang Yi-Xin Chen qing-qing Zhou Hui-Qin Li Xin-Sheng Peng Yan-Fang Zhou Department of Pathophysiology Guangdong Medical UniversityDongguan 523808China Department of Pharmacy Guangdong Medical UniversityDongguan 523808China

Skin photoaging is induced and sustained by UV-induced oxidative damage,and stimulating regeneration of the UV-induced aging has remained a great challenge due to high-level oxidative stress factor(ROS)-induced chronic oxidative damage and inactivation of bio-macromolecule-based regeneration in oxidative photoaging *** this study,we designed a“seed and soil”strategy to pursue a safer and more efficient way to prevent and treat photoaging by simultaneously changing UV-induced ROS-rich micro-environment into a proregenerative one(the“soil”)and providing growth factor-rich platelet lysates(PL,the“seed”)using PL-impregnated,collagen-reinforce hydrogel(PL/Col).SD rats were used to establish photoaging model by 8 weeks of UV *** effectiveness of different treatments was evaluated by making pathological sections and detecting photoaging-related *** treated with PL/Col demonstrated a significant acceleration in skin healing and enhancement in the quality of trauma *** treated with PL/Col,the rats showed smooth yellowish appearance,integral structure of skin collagen fiber and epidermis,a decrease in inflammation and a reshaped active micro-environment with reduced levels of SOD enzyme activity,GSH enzyme activity and MDA toxic *** of PL/Col in skin photoaging has shown potential anti-oxidation and anti-aging effects and is worthy of further study in related field.

关键词： photoaging platelet derivatives oxidative stress growth factors collagen trauma repair

Effect of pyrite content on chalcopyrite flotation under different regrinding conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 49-57页

作者： Zejun wang qing Shi Guofan Zhang Yuxuan Zhu Binbin Li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South UniversityChangsha 410083China

This study aimed to investigate the effect of varying pyrite(Py)content on copper(Cu)in the presence of different regrinding conditions,which were altered using different types of grinding media:iron,ceramic balls,and their mixture,followed by flotation in the cleaner *** flotation performance of rough Cu concentrate can be improved by changing the regrinding conditions based on the Py *** electron microscopy,X-ray spectrometry,ethylenediaminetetraacetic acid disodium salt extraction,and X-ray photoelectron spectroscopy studies illustrated that when the Py content was high,the use of iron media in regrinding promoted the generation of hydrophilic Fe OOH on the surface of Py and improved the Cu *** ceramic medium with a low Py content prevented excessive Fe OOH from covering the surface of chalcopyrite(Cpy).Electrochemical studies further showed that the galvanic corrosion current of Cpy-Py increased with the addition of Py and became stronger with the participation of iron media.

关键词： chalcopyrite regrinding media pyrite galvanic corrosion flotation

Secure beamforming and deployment design for rate-splitting multiple access-based UAV communications

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Science China(Information Sciences) 2025年第1期68卷 342-356页

作者： bing wang Xiaofeng TAO Shujun HAN Huici WU Kai YANG Zhu HAN National Engineering Research Center of Mobile Network Technologies Beijing University of Posts and Telecommunications Peng Cheng Laboratory Department of Electrical and Computer Engineering University of Houston

Rate-splitting multiple access(RSMA) has recently gained attention as a potential robust multiple access(MA)scheme for upcoming wireless networks. Given its ability to efficiently utilize wireless resources and design interference management strategies, it can be applied to unmanned aerial vehicle(UAV) networks to provide convenient services for large-scale access ground users. However, due to the line-of-sight(LoS) broadcast nature of UAV transmission, information is susceptible to eavesdropping in RSMA-based UAV networks. Moreover, the superposition of signals at the receiver in such networks becomes complicated. To cope with the challenge, we propose a two-user multi-input single-output(MISO) RSMA-based UAV secure transmission framework in downlink communication networks. In a passive eavesdropping scenario, our goal is to maximize the sum secrecy rate by optimizing the transmit beamforming and deployment location of the UAV-base station(UAV-BS),while considering quality-of-service(QoS) constraints, maximum transmit power, and flight space limitations. To address the non-convexity of the proposed problem, the optimization problem is first decoupled into two subproblems. Then, the successive convex approximation(SCA) method is employed to solve each subproblem using different propositions. In addition, an alternating optimization(AO)-based location RSMA(L-RSMA) beamforming algorithm is developed to implement joint optimization to obtain the suboptimal solution. Numerical results demonstrate that(1) the proposed L-RSMA scheme yields a28.97% higher sum secrecy rate than the baseline L-space division multiple access(SDMA) scheme;(2) the proposed L-RSMA scheme improves the security performance by 42.61% compared to the L-non-orthogonal multiple access(NOMA) scheme.

关键词： rate-splitting multiple access UAV communication precoding optimization deployment location physical layer security

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Ideal Bi‑Based Hybrid Anode Material for Ultrafast Charging of Sodium‑Ion Batteries at Extremely Low Temperatures

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Nano-Micro Letters 2025年第3期17卷 152-167页

作者： Jie Bai Jian Hui Jia Yu wang Chun Cheng Yang qing Jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022People’s Republic of China

Sodium-ion batteries have emerged as competitive substitutes for low-temperature applications due to severe capacity loss and safety concerns of lithium-ion batteries at−20°C or ***,the key capability of ultrafast charging at ultralow temperature for SIBs is rarely ***,a hybrid of Bi nanoparticles embedded in carbon nanorods is demonstrated as an ideal material to address this issue,which is synthesized via a high temperature shock *** a hybrid shows an unprecedented rate performance(237.9 mAh g^(−1)at 2 A g^(−1))at−60℃,outperforming all reported SIB anode *** with a Na_(3)V_(2)(PO_(4))_(3)cathode,the energy density of the full cell can reach to 181.9 Wh kg^(−1)at−40°*** on this work,a novel strategy of high-rate activation is proposed to enhance performances of Bi-based materials in cryogenic conditions by creating new active sites for interfacial reaction under large current.

关键词： Bi nanoparticles High temperature shock High-rate activation Ultrafast charging Low-temperature sodium-ion batteries