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| 1 | Shock wave generation and its influencing parameters based on diesel injector显示文摘Based on schlieren imaging method the shock wave generated by diesel injector has been investigated,and the influences of ambient gas property, the progress of the spray, ambient gas density and ambient gas temperature on shock wave have been analyzed. The results show that:the images of spray shock wave are cleaner using sulfur hexafluoride(SF6) as ambient gas than using the nitrogen(N2); at the beginning of injection, shock wave phenomenon does not generate immediately as the fuel leave the nozzle because of the needle movement, and the hesitation is decided by the injection condition and characteristics of injector. The generation of shock wave in the spray tip and the detachment of shock wave from the spray tip show little effect on the spray macroscopic characteristics. The ambient gas density and temperature have a significant effect on the maximum of spray tip velocity, types of shock wave and the detachment timing of shock wave from the spray tip. | Weidi Huang Zhijun Wu Ya Gao Zhilong Li Liguang Li | 2014 | Chinese Science Bulletin2014，59，27： | 4 |
| 2 | Basic Mechanical Parameter Relations of Soft Clay in Pearl River Delta 显示文摘 | Li Zhangming Qi Na Luo Zhibin and Lin Weidi | 2014 | Geotechnical Engineering2014，8，1： | 1 |
| 3 | Occurrence, partition behavior, source and ecological risk assessment of nitro-PAHs in the sediment and water of Taige Canal, China显示文摘Nitrated polycyclic aromatic hydrocarbons(NPAHs)are widespread organic pollutants that possess carcinogenic and mutagenic properties,so they may pose a risk to the environment and human health.In this study,the concentrations of 15 NPAHs and 16 polycyclic aromatic hydrocarbons(PAHs)in 30 surface water samples and 26 sediment samples were measured in 2018 from the Taige Canal,one of the main rivers flowing into Taihu Lake,China.The total NPAH concentrations in water and sediment ranged from 14.7 to 235 ng/L and 22.9 to 96.5 ng/g dw,respectively.9-nitrophenanthrene(nd–76.3 ng/L)was the dominant compound in surface water,while 2+3-nitrofluoranthene(1.73–18.1 ng/g dw)dominated in sediment.Among PAHs,concentration ranging from 1,097 to 2,981 ng/L and 1,089 to 4,489 ng/g dw in surface water and sediment,respectively.There was a strong positive correlation between the log octanol-water partition coefficient(Kow)and log sediment-water partition coefficient due to hydrophobic interaction.The fugacity fraction value increased with the decrease of log Kow,and chrysene was transferred from water into sediment.The residual NPAHs in surface water and sediment of the Taige Canal have partial correlation.Diesel engine and coal combustion emissions were probably the principal sources of NPAHs in surface water and sediment.The results of ecological risk assessment showed that some NPAHs inwater(e.g,1-nitropyrene and 6-nitrochrysene)and sediment(e.g.,2-nitrobiphenyl,5-nitroacenaphthene,9-nitrophenanthrene and 2+3-nitrofluoranthene)had moderate ecological risks,which should be of concern. | Jijie Kong Tao Ma Xiaoyu Cao Weidi Li Fengxiao Zhu Huan He Cheng Sun Shaogui Yang Shiyin Li Qiming Xian | 2023 | Journal of Environmental Sciences2023，，2： | 1 |
| 4 | Using 18 F-Fluorodeoxyglucose Positron Emission Tomography to Estimate the Length of Gross Tumor in Patients With Squamous Cell Carcinoma of the Esophagus显示文摘 | Xiaojun Zhong Jinming Yu Baijiang Zhang Dianbin Mu Weidi Zhang Daotang Li Anqin Han Pingping Song Hui Li Guoren Yang Feng-Ming Kong Zheng Fu | 2009 | International Journal of Radiation Oncology Biology Physics2009，，1： | 1 |
| 5 | Using 18 F-Fluorodeoxyglucose Positron Emission Tomography to Estimate the Length of Gross Tumor in Patients With Squamous Cell Carcinoma of the Esophagus显示文摘 | Xiaojun Zhong Jinming Yu Baijiang Zhang Dianbin Mu Weidi Zhang Daotang Li Anqin Han Pingping Song Hui Li Guoren Yang Feng-Ming Kong Zheng Fu | 2009 | International Journal of Radiation Oncology Biology Physics2009，，1： | 1 |
| 6 | Coupled evolution of piston asperity and cylinder bore contour of piston/cylinder pair in axial piston pump显示文摘The wear condition of the piston/cylinder pair is crucial to the performance and reliability of the axial piston pump.The hard piston surface,the soft cylinder bore surface,and the interface oil film affects each other during the wear process.Specifically,in the mixed lubrication region,the geometry of the hard piston surface asperity directly affects the wear of soft cylinder bore surface,while the asperities may deform or even degrade when penetrating and sliding against the cylinder bore.So far,there is no suitable method to simulate their coupled evolution.This paper proposed a wear process simulation model considering the real-time interaction between the elasto-plastic deformation of the piston surface asperity,the wear contour of the cylinder bore,and the lubrication condition of the interface.An offline library of the elasto-plastic constitutive behavior of the asperity based on the finite element method(FEM)is established as a part of the simulation model to precisely analyze the deformation and degradation of the asperity and quickly invoke them in the numerical wear process simulation.The simulation and experimental results show that the piston asperity and the cylinder bore contour converge to a steady state after running-in for about 0.5 h.The distribution of the simulated asperity degradation and wear depth is also verified by the experiment. | Fei LYU Junhui ZHANG Shoujun ZHAO Kun LI Bing XU Weidi HUANG Haogong XU Xiaochen HUANG | 2023 | Chinese Journal of Aeronautics2023，36，8： | 0 |
| 7 | High frequency electrical field-ultrashort wave therapy for treatment of cerebral ischemia/reperfusion injury in rats Histopathological evaluation显示文摘BACKGROUND: Ultrashortwave (USW) therapy may be a new method for treatment of ischemic cerebrovascular diseases. It is necessary to study its treatment time window. OBJECTIVE: To observe the effect of USW on reperfusion injury after occlusion of the middle cerebral artery (MCAO) in rats and discuss its acting mechanisms and best occasion. DESIGN: Randomized controlled observation, animal experiment. SETTING: Laboratory of Department of Rehabilitation Medicine, First Hospital Affiliated to China Medical University. MATERIALS: Sixty-six healthy Wistar rats of either gender and of clean grade, aged 18–20 weeks, weighing from 250 to 300 g, were provided by the Experimental Animal Center of China Medical University. An USW device (Shanghai Electrical Device Company) with the frequency of 40.68 MHz and the maximum output power of 40 W, and the first channel power controlled at about 11 W was used in this study. Output power was determined by photometry. METHODS: Sixty-six rats were randomly divided into 3 groups: Sham-operation group (n =6): The suture was inserted only 1.0 depth during operation, which did not cause MACO; Model group (n =12): The USW treatment procedure was performed with the power off on the model rats; USW treatment group (n =48): The 48 rats were randomly divided into modeling 0, 6, 12 and 18 hours 4 subgroups. USW therapy without heat was used on the head of rats for 10 minutes at each time point. Twelve rats in USW treatment group were decapitated following treatment at each time point, and then their brain tissues were harvested. The rat brain tissues in other groups were harvested by decapitation at 24 hours after modeling. When the rats were awake, the neurologic deficit was scored by Zea-Longa five-point scale (a score of 0 indicated no neurologic deficit, a score of 1 indicated failure to extend left paw fully, a score of 2 indicated circling to the left, and a score of 3 indicated falling to the left, and rats with a score of 4 did not walk spontaneously and has a depressed level of consciousness.) Rats which still survived at 24 hours and was scored 1 and 2 on the neurologic scoring were involved in the analysis. ① Determination of cerebral water content: Cerebral water contents of healthy and injured hemisphere were determined by wet/dry weighing method. Cerebral water content (100%) =(1–dry/wet weight)×100%.②Infarction volume: The brain tissue was sliced into 2 mm sections and each section was stained with 20 g/L 2,3,5-triphenyltetrazolium chloride (TTC) by TTC staining technique for 30 minutes in a water bath at 37 ℃.Then, the section was fixed in 100 g/L formaldehyde for 10 minutes .The infarction volume was analyzed by using an imaging analyzer.③ Preparation of light microscopic sample: The rat brain tissue fixed by 100 g/L neutral formaldehyde and stained with TTC, were gradiently dehydrated with alcoholic, embedded with paraffin, sliced and stained by HE, finally, the sections were observed under the light microscope. MAIN OUTCOME MEASURES: Cerebral water content, cerebral infarction volume and cerebral histomorphology of rats in each group. RESULTS: Sixty-six rats were involved in the final analysis. ①Cerebral water content: There were no significant differences of cerebral water content in healthy hemisphere among groups (P > 0.05). Cerebral water content of injured hemisphere in the model group and at modeling 0, 6, 12 and 18 hours in the USW treatment group was (81.50±0.74) %, (81.02±0.83) %, (79.78±0.70) %, (79.74±0.84) %, (79.39± 1.06) %, respectively, which was significantly higher than that in the sham-operation group [(78.09±0.52) %, P < 0.05]. At modeling 0, 6 and 12 hours, the cerebral water content in the injured hemisphere in the USW treatment group was significantly lower than that in the model group, respectively (P < 0.05). It indicatedthat USW treatment given at 6, 12 and 18 hours after ischemia/reperfusion can lessen brain edema. ② Cerebral infarction volume: At modeling 18 hours, cerebral infarction volume in the injured hemisphere of USW treatment group was smaller than that in the model group [(191.62±121.45),(362.03±142.01)mm3, t =2.23,P < 0.05]. ③ Cerebral histomorphological observation: No swelling was found in the brain tissue section of rats in the sham-operation group. In the model group, the size of infarction hemisphere was obviously increased, gyrus became flattened, cortical sulci was shallow, the color at infarct focus obviously became light, and the tissue was fragile and brittle. In the sham-operation group, it was found under the microscope that mesenchyma was highly swelled, neuronal peripheral interspace was obviously broadened, neurons presented triangle, nucleoli were reduced, condensed even disappeared, and neutrophils in the vascular cavity were obviously increased. In the USW treatment group, pathological injury was not obviously lessened at 0 hour, moderate or mild edema could be found in the injured hemisphere of USW treatment group at modeling 6,12 and 18 hours, and at this time, neutrophils in vascular cavity were increased slightly, and pathological injuries were lessened. CONCLUSION: USW may play a protective effect on cerebral ischemia/reperfusion injury by decreasing brain edema and/or cerebral infarction volume. The treatment action of USW may start at 6 hours after reperfusion, and the best occasion of application may be at 18 hours after reperfusion. | Lixin Zhang Zhiqiang Zhang Weidi Liang Lin Li Xiuhua Yuan | 2007 | Neural Regeneration Research2007，2，5： | 0 |
| 8 | Metabolic Profiling in Banana Pseudo-Stem Reveals a Diverse Set of Bioactive Compounds with Potential Nutritional and Industrial Applications显示文摘Banana(Musa spp.)is an ancient and popular fruit plant with highly nutritious fruit.The pseudo-stem of banana represents on average 75%of the total dry mass but its valorization as a nutritional and industrial by-product is limited.Recent advances in metabolomics have paved the way to understand and evaluate the presence of diverse sets of metabolites in different plant parts.This study aimed at exploring the diversity of primary and secondary metabolites in the banana pseudo-stem.Hereby,we identified and quantified 373 metabolites from a diverse range of classes including,alkaloids,flavonoids,lipids,phenolic acids,amino acids and its derivatives,nucleotide and its derivatives,organic acids,lignans and coumarins,tannins,and terpene using the widely-targeted metabolomics approach.Banana pseudo-stem is enriched in metabolites for utilization in the food industry(L-lysine and L-tryptophan,L-glutamic acid,Phenylalanine,Palmitoleic acid,α-Linolenic acid,and Lauric acid,and Adenine)and pharmaceutical industry(Guanosine and Cimidahurinine,Bergapten,Coumarins,Procyanidin A2,Procyanidin B1,Procyanidin B3,Procyanidin B2,and Procyanidin B4,Asiatic acid).The metabolome of banana pseudo-stem with integration across multiomics data may provide the opportunity to exploit the rich metabolome of banana pseudo-stem for industrial and nutritional applications. | Guiming Deng Ou Sheng Fangcheng Bi Chunyu Li Tongxin Dou Tao Dong Qiaosong Yang Huijun Gao Jing Liu Xiaohong Zhong Miao Peng Ganjun Yi Weidi He Chunhua Hu | 2020 | Phyton-International Journal of Experimental Botany2020，89，4： | 0 |
| 9 | Self-assembly of carbon nanomaterials onto carbon fiber to improve the interfacial properties of epoxy composites显示文摘The interfacial property of carbon fiber(CF)reinforced composites is crucial to facilitate the application of high-strength composites.Utilizing the electrostatic and hydrogen bond properties of diazo resin,carbon nanotubes(CNTs)and graphene oxide(GO)could be quickly grafted onto the surface of the CF via the layer-by-layer self-assembly technique.The results showed that CNTs and GO were uniformly coated onto the CF surface,and the chemical activity and roughness of the modified CF surface were improved signif-icantly.The modified CF surface can significantly augment the interaction between the epoxy resin and the fiber.Remarkably,due to the good interfacial property,the impact performance of the composites re-inforced with the nanomaterial-modified CF was improved obviously.In addition,the interface properties of the composites are studied in depth.This method is expected to achieve rapid surface modification of carbon fiber. | Hao Yan Dongqi Hu Yifeng Dai Xiaoyu Zhang Hua Yuan Weidi Li Xiaoyu Huang Yeqiang Tan | 2023 | Journal of Materials Science & Technology2023，，30： | 0 |
| 10 | Flavonol synthase gene MsFLS13 regulates saline-alkali stress tolerance in alfalfa显示文摘Alfalfa(Medicago sativa L.) is one of the most extensively grown leguminous forage worldwide.Environmental saline-alkali stress significantly influences the growth,development,and yield of alfalfa,posing a threat to its agricultural production.However,little is known about the potential mechanisms by which alfalfa responds to saline-alkali stress.Here,we investigated these mechanisms by cloning a saline-alkali-induced flavonol synthase gene(Ms FLS13) from alfalfa,which was previously reported to be significantly upregulated under saline-alkali stress,and examining its function in the saline-alkali response.Overexpression of Ms FLS13 in alfalfa promoted plant tolerance to saline-alkali stress by enhancing flavonol accumulation,antioxidant capacity,osmotic balance,and photosynthetic efficiency.Conversely,Ms FLS13 inhibition using RNA interference reduced flavonol synthase activity and inhibited hairy root growth under saline-alkali stress.Yeast one-hybrid and dual-luciferase reporter assays indicated that the R2R3-MYB Ms MYB12 transcription factor activates Ms FLS13 expression by binding to the MBS motif in the Ms FLS13 promoter.Further analysis revealed that abscisic acid mediates the salinealkali stress response partially by inducing Ms MYB12 and Ms FLS13 expression,which consequently increases flavonol levels and maintains antioxidant homeostasis in alfalfa.Collectively,our findings highlight the crucial role of Ms FLS13 in alfalfa in response to saline-alkali stress and provide a novel genetic resource for creating saline-alkali-resistant alfalfa through genetic engineering. | Lishuang Zhang Yugang Sun Jinqiang Ji Weidi Zhao Weileng Guo Jiaqi Li Yan Bai Dan Wang Zhe Yan Changhong Guo | 2023 | The Crop Journal2023，11，4： | 0 |
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