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A comprehensive fluid-solid coupling dynamic simulation for spatiotemporal distribution of regression rate in hybrid rocket motors

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Chinese Journal of Aeronautics 2024年第9期37卷 100-112页

作者： tianfang wei Guobiao CAI Hui TIAN Xiangyu MENG Xianzhu JIANG Xiaoming GU School of Astronautics Beihang UniversityBeijing 100191China Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies Ministry of Education Beijing 100191China

The spatiotemporal distribution characteristics of the regression rate are crucial aspects of the research on Hybrid Rocket Motor(HRM). This study presents a pioneering effort in achieving a comprehensive numerical simulation of fluid dynamics and heat transfer in both the fluid and solid regions throughout the entire operation of an HRM. To accomplish this, a dynamic grid technique that incorporates fluid–solid coupling is utilized. To validate the precision of the numerical simulations, a firing test is conducted, with embedded thermocouple probes being used to measure the inner temperature of the fuel grain. The temperature variations in the solid fuel obtained from both experiment and simulations show good agreement. The maximum combustion temperature and average thrust obtained from the simulations are found to deviate from the experimental results by only 3.3% and 2.4%, respectively. Thus, it can be demonstrated that transient numerical simulations accurately capture the fluid–solid coupling characteristics and transient regression rate. The dynamic simulation results of inner flow field and solid region throughout the entire working stage reveal that the presence of vortices enhances the blending of combustion gases and improves the regression rate at both the front and rear ends of the fuel grain. In addition, oscillations of the regression rate obtained in the simulation can also be well corresponded with the corrugated surface observed in the experiment. Furthermore, the zero-dimension regression rate formula and the formula describing the axial location dependence of the regression rate are fitted from the simulation results, with the corresponding coefficients of determination(R^(2)) of 0.9765 and 0.9298, *** research serves as a reference for predicting the performance of HRM with gas oxygen and polyethylene, and presents a credible way for investigating the spatiotemporal distribution of the regression rate.

关键词： Hybrid Rocket Motor(HRM) Transient numerical simulation Fluid-solid couplingheat transfer Spatiotemporal distribution of regression rate Dynamic grid

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基于红外热成像技术实现陶瓷容器的无损检测

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陶瓷 2023年第10期 127-130,215页

作者：谢晋周建弟曹雪静李嘉举陈非宇马海平程雪魏天放张维加绍兴文理学院数理信息学院浙江绍兴312000 浙江古越龙山绍兴酒股份有限公司浙江绍兴312000

笔者研究的目的在于利用红外热成像技术对陶瓷酒瓶进行无损检测,以替代传统的人工检测方式,实现精准大批量的陶瓷酒瓶缺陷检测。研究证明,只需进行微小的温度改变,酒瓶的热传导效应就能产生具有温度差的图像,实现红外热成像检测。本次... 详细信息

笔者研究的目的在于利用红外热成像技术对陶瓷酒瓶进行无损检测,以替代传统的人工检测方式,实现精准大批量的陶瓷酒瓶缺陷检测。研究证明,只需进行微小的温度改变,酒瓶的热传导效应就能产生具有温度差的图像,实现红外热成像检测。本次研究使用了FLIR X8501sc红外热成像系统,对存在微小裂缝的陶瓷酒瓶进行检测,并与对照组及裂缝形态进行对比。实验结果表明,温度越高,温度差异的分布越明显,红外检测裂缝的形状越精确。即使热分布会受到陶瓷酒瓶形状的影响,但是不会影响到对裂缝的检测。此外,热红外检测也能够检测到裂缝的相对深度,具有非常广泛的应用前景。

关键词：无损检测红外热成像裂缝检测陶瓷酒瓶

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Assessment of traditional Chinese medicine pattern in a bleomycininduced pulmonary fibrosis mouse model: A pilot study

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Journal of Traditional Chinese Medical Sciences 2022年第4期9卷 400-408页

作者： Xiaofeng Gu Wan wei Zhaoheng Liu Fang Cao Zhisong Wu Jie Xie tianfang Wang Yang Jiao Department of Respiratory and Critical Care Medicine The First Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou310003China Department of Geriatrics Dongfang Hospital Affiliated to Beijing University of Chinese MedicineBeijing100078China School of Life Sciences Beijing University of Chinese MedicineBeijing102488China Department of Intensive Cae Unit Dongfang Hospital Affiliated to Beijing University of Chinese MedicineBeijing100078China School of Postgraduate Beijing University of Chinese MedicineBeijing100029China School of Traditional Chinese Medicine Beijing University of Chinese MedicineBeijing102488China Department of Respiratory Dongfang Hospital Affiliated to Beijing University of Chinese MedicineBeijing100078China

Objective:To initially explore traditional Chinese medicine patterns in a bleomycin-induced pulmonary fibrosis mouse ***:Thirty-six C57BL/6 mice were divided by the random number table method(with 12 rats per group)into three groups:a blank group,a model group,and a number 2 Feibi recipe(FBR-2)*** pulmonary fibrosis mouse model was established by intratracheal instillation of *** FBR-2 group was treated with FBR-2 for 4 *** in the mice such as mental behavior,food/water intake,body weight,body temperature,respiratory rate,and tongue image were *** samples were collected on the 14th day and 28th day after modeling,and lung tissues were visually assessed and microscopically evaluated by staining with hematoxylin-eosin and *** expression levels of hydroxyproline,interleukin(IL)-33,IL-37,tissue plasminogen activator,and plasminogen activator inhibitor-1 were determined by enzyme-linked immunosorbent ***:Mice in the model group were poor in spirit,less active,slow in response,showed reduced food/water intake,body temperature,and body weight,increased respiratory rate,and their tongue color had changed from light red to dark ***,treatment with FBR-2 significantly improved these *** inflammatory cell infiltration and collagen fiber deposition were observed in the lung tissues of the model *** with the blank group,the levels of hydroxyproline,IL-33,and plasminogen activator inhibitor-1 in the model group significantly increased(all P<.05),whereas that of tissue plasminogen activator significantly decreased on the 14th day and 28th day(P=.036 and P=.005,respectively).Moreover,FBR-2 improved lung inflammation and fibrinolysis imbalance and reduced collagen fiber ***:To some extent,our bleomycin-induced pulmonary fibrosis mouse model exhibited traditional Chinese medicine patterns of qi deficiency,blood stasis,and heat retention.

关键词： Bleomycin Idiopathic pulmonary fibrosis Pattern characteristics Tongue image Fibrinolytic factor Inflammatory factor

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Effects of the menstrual cycle and neuroticism on women's sadness emotion and physiological responses based on an emotion-inducing experiment

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Journal of Traditional Chinese Medical Sciences 2019年第2期6卷 138-146页

作者： Hao Wu tianfang Wang Yu wei Mengying Wu Yamei Huang Min Zheng Renlai Zhou Qingguo Wang Yan Zhao School of Traditional Chinese Medicine Beijing University of Chinese MedicineBeijing 100029China Huguosi Hospital of the Traditional Chinese Medicine Affiliated to the Beijing University of Chinese Medicine Beijing 100035China China National Center for Food Safety Risk Assessment Beijing 100022China School of Psychology Beijing Normal UniversityBeijing 100875China Department of Psychology School of Social and Behavioral SciencesNanjing UniversityNanjing 210023China

Objective:To investigate the diversity of experiences of sadness emotion and physiological responses among female college students with high neuroticism (HN) and low neuroticism (LN) during the late luteal phase (LLP) and early follicular phase (EFP).Methods:Forty-two participants were classified as the HN group and 41 as the LN group based on their neuroticism score (Eysenck Personality Questionnaire Short Scale for Chinese).Participants watched sadness-inducing experimental films during the LLP and ***:The HN group showed similar sadness intensities in both *** LN group showed higher sadness intensity in the LLP than the *** LN group's sadness scale assessments were lower than the HN group in both *** blood volume pulse in the HN group fell in both the LLP and EFP (both P .05).Between-group comparisons showed heart rate was significantly lower in the HN group than the LN group during EFP (P =.009),but there were no statistically significant differences in subjective experience and physiological data during *** HN group had stronger sadness feelings and greater sadness arousal than the LN group during *** were significant associations between menstrual cycle-related changes in sadness ratings and changes in physiological ***:Women with HN have less fluctuation in sadness than those with LN during the menstrual cycle,but experience strong sadness feelings in the *** with HN show stronger physiological responses in the EFP than those with LN,and have the highest responses in the LLP.

关键词： Neuroticism Menstruation Sadness Emotional responses

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聚苯并[1,2-d∶5,4-d′]二噁唑-2,6-二(1,4-亚萘基)的合成及表征

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化工新型材料 2018年第1期46卷 86-88页

作者：崔天放魏亮沈阳化工大学应用化学学院沈阳110142

采用4,6-二氨基-1,3-苯二酚盐酸盐和1,4-萘二甲酸为原料,在磷酸、多聚磷酸介质中经溶液缩聚,制得聚苯并[1,2-d∶5,4-d′]二噁唑-2,6-二(1,4-亚萘基)(PNBO),并对制得的PNBO进行表征。研究结果表明:在P_2O_5添加量为84%(wt,质量分数),减... 详细信息

采用4,6-二氨基-1,3-苯二酚盐酸盐和1,4-萘二甲酸为原料,在磷酸、多聚磷酸介质中经溶液缩聚,制得聚苯并[1,2-d∶5,4-d′]二噁唑-2,6-二(1,4-亚萘基)(PNBO),并对制得的PNBO进行表征。研究结果表明:在P_2O_5添加量为84%(wt,质量分数),减压、氮气保护条件下,制得的PNBO产率达到86.73%,黏度达到17.95dL/g,并具有较好的耐热性能。

关键词：聚苯并[1 2-d∶5 4-d′]二噁唑-2 6-二(1 4-亚萘基) 4 6-二氨基-1 3-苯二酚盐酸盐 1 4-萘二甲酸合成表征

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Biological mechanisms underlying the liver's regulation of emotions in women: A study using the Trier Social Stress Test

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Journal of Traditional Chinese Medical Sciences 2018年第2期5卷 110-118页

作者： Yu wei tianfang Wang Hao Wu Yamei Huang Mengying Wu Min Zheng Renlai Zhou Qingguo Wang Yan Zhao School of Chinese Medicine Beijing University of Chinese MedicineBeijing 100029China School of Psychology Beijing Normal UniversityBeijing 100875China Mental Health Education and Counseling Center Beijing Institute of Fashion TechnologyBeijing 102209China Department of Psychology School of Social and Behavioral SciencesNanjing UniversityNanjing 210023China

Objective:Research on the biological mechanisms by which the liver controls dispersion and regulates emotion usually focuses on psychological *** study investigated the biological mechanisms underlying the liver's regulation of emotion using the Trier Social Stress Test (TSST).Differences in subjective stress,subjective emotion,and physiological responses were examined between healthy women (Group A) and depressed women with liver qi stagnation syndrome (Group B).Method:Subjects were 72 women who met the inclusion criteria after physical *** EPQ-RSC,BAI,and BDI-21 were used to assess personality and *** completed a 5-point scale to measure subjective *** rate and heart rate variability were *** measure changes in activity of the locus coeruleus-norepinephrine (LCNE)/autonomic nervous system and the HPA axis,saliva samples were collected at the end of the rest and preparation periods,and 5 time pionts after the TSST *** PAD Emotion Scale was completed at 4 time points before and after the TSST *** cortisol was *** indexes were compared between the two ***:There were 33 subjects in Group A and 39 subjects in Group *** in Group B had lower levels of stress,pleasure,and dominance,but higher arousal (after the task:P <.05).They also had higher saliva cortisol levels,slower heart rate,higher BVP,and more stable RMSSD and ***:In relation to mood,the liver's regulation of emotion mainly affects negative emotional experience and the sense of control Regarding the biological mechanisms underlying the liver's regulation of emotion,the activity of the LC-NE/autonomic nervous system in women is more obvious in response to psychological stress when the dispersion of the liver is *** activity of the HPA axis in women is more obvious in response to psychological stress when the dispersion of the liver is abnormal.

关键词： Trier Social Stress Test (TSST) Liver regulates emotions Stress

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胶原蛋白海绵的制备及安全性评价

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中国组织工程研究 2022年第22期26卷 3460-3466页

作者：刘超远高田芳黄伟杭州协合医疗用品有限公司浙江省杭州市310018

背景:自动物体提取胶原蛋白并经冻干工艺得到胶原蛋白海绵,可赋予材料良好的临床止血性能,同时可实现在机体中的自身降解,但所提取的胶原蛋白也存在携带病毒及体内免疫原性风险。经过酸酶结合工艺处理去除胶原端肽、并灭活病毒,实现材... 详细信息

背景:自动物体提取胶原蛋白并经冻干工艺得到胶原蛋白海绵,可赋予材料良好的临床止血性能,同时可实现在机体中的自身降解,但所提取的胶原蛋白也存在携带病毒及体内免疫原性风险。经过酸酶结合工艺处理去除胶原端肽、并灭活病毒,实现材料良好的生物安全性。目的:规模化生产制备胶原蛋白海绵,并对其进行免疫原性及病毒灭活有效性的整体生物安全性评价。方法:通过酸酶结合法从牛跟腱中提取胶原蛋白,经冷冻干燥工艺得到胶原蛋白止血海绵。将1,4片胶原蛋白海绵分别埋植于Wistar大鼠腹部皮下,埋植1,4,8,12周后对大鼠体征、血常规、T淋巴细胞增殖、免疫球蛋白含量等指标进行检测。取3批次的牛跟腱粉碎后中间体样品,分别浸泡于伪狂犬病毒、水泡性口炎病毒、猪细小病毒和猪脑心肌炎病毒液中,检验酸酶结合法处理的胶原蛋白海绵对病毒灭活的有效性。结果与结论:(1)于无菌车间规模化提取胶原蛋白,经冷冻干燥后得到胶原蛋白海绵,并完成内外包装和辐照灭菌的生产全过程;(2)埋植1,4片胶原蛋白海绵大鼠的生理体征、血常规、NK细胞杀伤活性、T淋巴细胞增殖状态及免疫球蛋白含量等指标均表现正常;(3)酸酶法工艺灭活的3批次牛跟腱粉碎后中间体样品均无可以检测到的病毒,可使病毒滴度下降4个logs以上;同时,对未能检测到的病毒滴度样品进行了敏感细胞接种盲传3代,结果未显示细胞病变;(4)免疫原性和病毒灭活检测表明,所制备的胶原蛋白止血海绵有着良好的生物安全性。

关键词：胶原蛋白海绵止血材料端肽免疫原性冷冻干燥酸酶结合法病毒灭活

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意见时空元素的研究

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中文信息学报 2011年第3期25卷 72-78页

作者：刘军姚天昉仇伟上海交通大学计算机科学与工程系上海200240

为了满足新应用需求,该文将时空元素引入到意见模型中。在此基础上,提出了意见重要因子的概念,分析了时间重要因子的计算公式,对手机和汽车论坛的来源重要因子进行了实验。在时空元素的应用上,对汽车评论进行了趋势挖掘,探讨了意见趋势... 详细信息

为了满足新应用需求,该文将时空元素引入到意见模型中。在此基础上,提出了意见重要因子的概念,分析了时间重要因子的计算公式,对手机和汽车论坛的来源重要因子进行了实验。在时空元素的应用上,对汽车评论进行了趋势挖掘,探讨了意见趋势的挖掘方法和实验评估方法。

关键词：时空元素意见模型重要因子意见趋势挖掘方法

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基于资源整合的手机图书馆系统的设计和实现

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现代图书情报技术 2009年第6期 76-80页

作者：方玮张成昱窦天芳清华大学图书馆北京100084

以清华大学图书馆提供移动读者服务为例,介绍基于资源整合的手机图书馆WAP服务系统的设计与实现,详细讲述在图书馆现有服务系统上,利用图书馆已有资源来拓展读者服务,为用户提供一个移动、综合的读者服务平台。

关键词： WAP 手机图书馆移动图书馆资源整合读者服务

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起垄措施对重度盐碱化草地土壤水盐和植被状况的影响

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草地学报 2010年第6期18卷 763-767页

作者：关法春苗彦军 tianfang Bernie Fang 兰小中梁正伟西藏农牧学院西藏林芝860000 德州州立大学圣马科斯分校地理系德克萨斯78666 中国科学院东北地理与农业生态所吉林长春130012

通过对起垄处理5年（2003-2007年）后的重度苏打盐碱化草地土壤水盐分布、物理特性及植被状况等相关指标的测定,探讨了起垄措施对重度苏打盐碱化草地的改良效果。结果表明：与自然状态下的土壤相比,起垄提高了0-30 cm内垄沟和垄台的表... 详细信息

通过对起垄处理5年（2003-2007年）后的重度苏打盐碱化草地土壤水盐分布、物理特性及植被状况等相关指标的测定,探讨了起垄措施对重度苏打盐碱化草地的改良效果。结果表明：与自然状态下的土壤相比,起垄提高了0-30 cm内垄沟和垄台的表层土壤含水量,垄沟的土壤电导率（EC）及pH呈现出一定程度的降低,其中0-10cm内的土壤EC显著降低（P〈0.05）,但是垄台土壤EC,pH升高,其土壤表面出现积盐现象,地表出现条带状碱斑;起垄后垄沟、垄台的土壤物理状况得到改善,其中垄沟0-10 cm的土壤容重显著降低而土壤孔隙度显著提高（P〈0.05）;起垄还提高了地表植被生物量和植被盖度。因此,起垄措施的应用加快了重度盐碱化草地的改良进程。

关键词：起垄盐碱地微地形改良

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