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Radiological environmental impact analysis of a 2-MW thorium molten salt reactor during an accident

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Nuclear Science and Techniques 2019年第5期30卷 70-81页

作者： Chang-Qi Chen Xiao-Bin Xia zhi-Hong zhang Jun Cai Chang-Yuan Li Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

The thorium molten salt reactor–liquid fuel(TMSR-LF1) has inherent safety features. The accident occurrence possibility and their consequences are much lower for the TMSR-LF1 than that of traditional *** on accident analysis, the maximum credible accident and the radioactive source terms of the TMSR-LF1 were first estimated. Then, the total effective dose of the maximum credible accident was calculated. Based on calculations, the cover gas flow rate can significantly affect the radiation consequences of the maximum credible accident when it changes from 0 to 10 L/min. If no cover gas is flowing, a site-area emergency would be required within the range of 50–73 m from the reactor. In the case of cover gas flow, only an abnormal notification and an alert two emergency class would be required within the range of 50 m.

关键词： TMSR-LF1 Accident classification and description Maximum credible accident Emergency class

In vitro corrosion of Mg-6Zn-IMn-4Sn-1.5Nd/0.5Y alloys

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Frontiers of Materials Science 2014年第3期8卷 230-243页

作者： Rong-Chang ZENG Lei WANG Ding-Fei zhang Hong-zhi CUI En-Hou HAN College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China College of Materials Science and Engineering Chongqing University Chongqing 400044 China National Engineering Center for Corrosion Control Institute of Metals Research Chinese Academy of Sciences Shenyang 110016 China

The microstructure evaluation, surface morphology, chemical compositions and phase analysis of the biomedical Mg-6Zn-IMn-4Sn-1.5Nd/0.5Y （ZMT614- 1.5Nd/0.5Y） alloys were investigated by means of optical microscopy, EPMA, X-ray EDS, XRD and FTIR. The corrosion behavior was evaluated using weight-loss measurement, hydrogen evolution, electrochemical and pH measurements, The results demonstrate that the microstructure for both ZMT614-1,5Nd alloy and ZMT614-0.5Y alloy is characterized by α-Mg and intermetallic compounds, most of which are distributed along the grain boundaries. These second phases contain Mg2Zn, Mg2Zn11, Mg2Sn and single metal Mn, together with Mg12Nd phase for the ZMT614-1.5Nd alloy, and with Mg24Y5 phase for the ZMT614-0.5Y alloy. Honeycomb-like corrosion product layers form. The corrosion resistance of the ZMT614-0.5Y alloy is higher than that of the ZMT614-1.5Nd alloy, which is ascribed to the addition of the element Y into the alloy delaying the corrosion initiation in comparison to that of Nd element in the alloy.

关键词： magnesium alloy yttrium neodymium corrosion biomaterial

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小口径不锈钢圆管自动TIG焊接工艺参数

焊接 2024年第5期 16-20,29页

作者：刘刚张梦金何之薛龙黄军芬中广核研究院有限公司广东深圳518000 北京石油化工学院北京102617

壁厚大于3 mm的小口径不锈钢圆管I形坡口自熔焊接,易出现未焊透缺陷,严重影响焊接质量。针对外径ϕ32.5 mm、壁厚为3.25 mm的304奥氏体不锈钢圆管I形坡口,采用自动钨极氩弧焊自熔焊接方法,通过数值模拟和焊接试验研究焊接工艺参数中焊接... 详细信息

壁厚大于3 mm的小口径不锈钢圆管I形坡口自熔焊接,易出现未焊透缺陷,严重影响焊接质量。针对外径ϕ32.5 mm、壁厚为3.25 mm的304奥氏体不锈钢圆管I形坡口,采用自动钨极氩弧焊自熔焊接方法,通过数值模拟和焊接试验研究焊接工艺参数中焊接电流和起弧预热时间对焊缝成形的影响。由数值模拟得出焊接电流、起弧预热时间与焊缝成形参数的对应关系,初步确定圆管自熔焊接试验的焊接电流和起弧预热时间范围。然后,通过自动钨极氩弧焊自熔焊接试验,得出了焊缝成形良好时的具体焊接电流、起弧预热时间。试验结果表明,焊接速度为100 mm/min、焊接电流为105 A,115 A时,圆管环缝中间焊段能够实现熔透,且焊缝不会产生塌陷缺陷。焊接电流为115 A、起弧预热时间为4 s和5 s时,起弧段焊缝背面熔宽较为稳定,能够确保焊缝可靠熔透。

关键词：自动钨极氩弧焊自熔焊接焊缝成形焊接过程数值模拟

Peutz-Jeghers syndrome without STK11 mutation may correlate with less severe clinical manifestations in Chinese patients

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World Journal of Gastroenterology 2023年第21期29卷 3302-3317页

作者： Li-Xin Jiang Yu-Rui Chen Zu-Xin Xu Yu-Hui zhang zhi zhang Peng-Fei Yu zhi-Wei Dong Hai-Rui Yang Guo-Li Gu Air Force Clinical College of China Medical University Beijing 100142China Fifth Clinical College(Air Force Clinical College)of Anhui Medical University Beijing 100142China Department of General Surgery Air Force Medical CenterChinese People's Liberation ArmyFifth Clinical(Air Force Clinical College)of China Medical UniversityBeijing 100142China

BACKGROUND Peutz-Jeghers syndrome(PJS) is an autosomal dominant genetic disease with skin mucosal pigment spots and gastrointestinal(GI) multiple hamartoma polyps as clinical characteristics. At present, it is considered that the germline mutation of STK11 gene is the genetic cause of PJS. However, not all PJS patients can be detected STK11 germline mutations. The specific clinical characteristics of these PJS patients without STK11 mutation is an interesting clinical question. Or, like wild type GI stromal tumor, whether these PJS without STK11 mutation are also called PJS is worth discussing. Therefore, we designed the study to understand the clinical characteristics of these PJS patients without STK11 *** To investigates whether PJS patients with known STK11 mutations have a more severe spectrum of clinical phenotypes compared to those *** A total of 92 patients with PJS admitted to the Air Force Medical Center from 2010 to 2022 were randomly selected for study. Genomic DNA samples were extracted from peripheral blood samples, and pathogenic germline mutations of STK11 were detected by high-throughput next-generation gene sequencing. Clinicalpathologic manifestations of patients with and without STK11/LKB1 mutations were *** STK11 germline mutations were observed in 73 patients with PJS. Among 19 patients with no detectable STK11 mutations, six had no pathogenic germline mutations of other genes, while 13 had other genetic mutations. Compared with PJS patients with STK11 mutations, those without tended to be older at the age of initial treatment, age of first intussusception and age of initial surgery. They also had a lower number of total hospitalizations relating to intussusception or intestinal obstruction, and a lower load of small intestine *** PJS patients without STK11 mutations might have less severe clinical-pathologic manifestations than those with.

关键词： Peutz-Jeghers syndrome STK11 Mutant type Wild type

A ^(15)N-Labeling Study of the Capture of Deep Soil Nitrate from Different Plant Systems

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Journal of Integrative Agriculture 2014年第1期13卷 167-176页

作者： YANG zhi-xin WANG Jue DI Hong-jie zhang Li-juan JU Xiao-tang Key Laboratory for Farmland Eco-Environment Hebei Province/College of Resource and Environmental SciencesAgricultural University of Hebei Centre for Soil and Environmental Research PO Box 85084Lincoln University College of Agricultural Resources and Environmental Sciences China Agricultural University

The objective of this study was to determine the efficiency of different plant systems in capturing deep soil nitrate （NO3-） to reduce NO3- leaching in a field plot experiment using 15N labelling. The study was conducted on a calcareous alluvial soil on the North China Plains and the plant systems evaluated included alfalfa （Medicago sativa）, American black poplar （Populus nigra） and cocksfoot （Dactylis）. ^15N-labelled N fertilizer was injected to 90 cm depth to determine the recovery of ^15N by the plants. With conventional water and nutrient management, the total recovery of ^15N-labeled NO3--N was 23.4% by alfalfa after two consecutive growth years. The recovery was significantly higher than those by American black poplar （12.3%） and cocksfoot （11.4%）. The highest proportion of soil residual ~SN from the labeled fertilizer N （%Ndff） was detected around 90 cm soil depth at the time of the 1st year harvest and at 110-130 cm soil depth at time of the 2nd year harvest. Soil %Ndff in 0-80 cm depth was significantly higher in the alfalfa treatment than those in all the other treatments. The soil %Ndff below 100 cm depth was much lower in the alfalfa than those in all the other treatments. These results indicated that ^15N leaching losses in the alfalfa treatment were significantly lower than by those in the black poplar and cocksfoot treatments, due to the higher root density located in nitrate labeling zone of soil profile. In conclusion, alfalfa may be used as a plant to capture deep soil NO3- left from previous crops to reduce NO3- leaching in high intensity crop cultivation systems of North China Plain.

关键词： ^15N-labeled nitrate tree and forage grass alfalfa cocksfoot black poplar residual nitrate in subsoil capture ability

Two sequential surgeries in infant with multiple floor of the mouth dermoid cysts: A case report

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World Journal of Clinical Cases 2020年第13期8卷 2885-2892页

作者： Nan-Nan Liu Xin-Yue zhang Yan-Yan Tang zhi-Ming Wang Department of Stomatology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND Multiple intraoral dermoid cysts of large magnitude generally appear in the second or third decade of *** are rare in infants and are usually *** this case,a large mass was identified in utero during prenatal *** SUMMARY We introduce a rare case on multiple dermoid cysts in the floor of the mouth of an infant who underwent two surgeries for *** magnetic resonance imaging confirmed a large well-circumscribed cystic lesion that originated at the former midline region in the floor of the mouth in which a suspicious lesion of minute size was likely compressed by the bulkier mass and ***,the infant underwent two surgeries by an intraoral approach within 9 *** 5 mo after the second operation,a routine follow-up ultrasound showed evidence of an additional *** further surgery was planned because the tumor had no immediate *** This report demonstrates the importance of carefully analyzing preoperative imaging to avoid multiple operations for a seemingly isolated oral cyst.

关键词： Multiple Dermoid cysts Floor of the mouth Infant Case report Recurrent

Mesenchymal stem cells from human umbilical cord ameliorate testicular dysfunction in a male rat hypogonadism model

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Asian Journal of Andrology 2017年第5期19卷 543-547页

作者： zhi-Yuan zhang Xiao-Yu Xing Guan-Qun Ju Liang Zhong Jie Sun Department of Urology Shanghai Children's Medical Center Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200127 China.

Androgen deficiency is a physical disorder that not only affects adults but can also jeopardize children＇s health. Because there are many disadvantages to using traditional androgen replacement therapy, we have herein attempted to explore the use of human umbilical cord mesenchymal stem cells for the treatment of androgen deficiency. We transplanted CM-Dil-labeled human umbilical cord mesenchymal stem cells into the testes of an ethane dimethanesulfonate （EDS）-induced male rat hypogonadism model. Twenty-one days after transplantation, we found that blood testosterone levels in the therapy group were higher than that of the control group （P= 0.037）, and using immunohistochemistry and flow cytometry, we observed that some of the CM-Dil-labeled cells expressed Leydig cell markers for cytochrome P450, family 11, subfamily A, polypeptide 1, and 3-β-hydroxysteroid dehydrogenase. We then recovered these cells and observed that they were still able to proliferate in vitro. The present study shows that mesenchymal stem cells from human umbilical cord may constitute a promising therapeutic modality for the treatment of male hypogonadism patients.

关键词： Leydig cells stem cells testicular dysfunction

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负载敏感多路阀阀芯组合节流口的空化研究

太原科技大学学报 2024年第2期45卷 176-181页

作者：马焱森魏聪梅郭铁虎仉志强太原科技大学机械工程学院太原030024 山西方盛液压机电设备有限公司山西晋中030600

针对负载敏感多路阀阀口空化严重的现象,利用Fluent中的多相流模型对多路阀阀芯U+U型组合节流口的空化现象进行仿真分析,通过Solidworks建立具有不同长度C、宽度R、深度b的组合节流口三维模型,将节流口三维模型在Workbench中进行流道抽... 详细信息

针对负载敏感多路阀阀口空化严重的现象,利用Fluent中的多相流模型对多路阀阀芯U+U型组合节流口的空化现象进行仿真分析,通过Solidworks建立具有不同长度C、宽度R、深度b的组合节流口三维模型,将节流口三维模型在Workbench中进行流道抽取,采用Fluent对抽取的流道模型进行模拟仿真,通过对36组数据对比分析,得到了大U型槽的深度、宽度、长度对多路阀阀芯节流口处气体体积分数值的影响规律。

关键词：多路阀空化 U+U型节流口

Two farnesyl pyrophosphate synthases,GhFPS1–2,in Gossypium hirsutum are involved in the biosynthesis of farnesol to attract parasitoid wasps

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Journal of Integrative Agriculture 2020年第9期19卷 2274-2285页

作者： zhang Hong HUANG Xin-zheng JING Wei-xia LIU Dan-feng Khalid Hussain DHILOO HAO zhi-min zhang Yong-jun Key Laboratory of Hebei Province for Molecular Plant-Microbe Interaction College of Life SciencesHebei Agricultural UniversityBaoding 071000P.R.China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China Department of Entomology Faculty of Crop ProtectionSindh Agriculture UniversityTandojamHyderabad 70060Pakistan

Sesquiterpenoids play an import role in the direct or indirect defense of *** pyrophosphate synthases(FPSs)catalyze the biosynthesis of farnesyl pyrophosphate,which is a key precursor of farnesol and(E)-β-*** the current study,two FPS genes in Gossypium hirsutum,GhFPS1 and GhFPS2,were heterologously cloned and functionally characterized in a greenhouse *** open reading frames for full-length GhFPS1 and GhFPS2 were each 1029 nucleotides,and encoded two proteins of 342 amino acids with molecular weights of 39.4 *** deduced amino acid sequences of GhFPS1–2 showed high identity to FPSs of other *** real-time PCR analysis revealed that GhFPS1 and GhFPS2 were highly expressed in *** leaves,and were upregulated in methyl jasmonate(MeJA)-,methyl salicylate(MeSA)-and aphid infestation-treated cotton *** recombinant proteins of either GhFPS1 or GhFPS2 plus calf intestinal alkaline phosphatase could convert geranyl diphosphate(GPP)or isopentenyl diphosphate(IPP)to one major product,***,in electrophysiological response and Y-tube olfactometer assays,farnesol showed obvious attractiveness to female Aphidius gifuensis,which is an important parasitic wasp of *** findings suggest that two GhFPSs are involved in farnesol biosynthesis and they play a crucial role in indirect defense of cotton against aphid infestation.

关键词： Gossypium hirsutum farnesyl pyrophosphate synthase GhFPS1-2 biosynthesis of farnesol Aphidius gifuensis behavioral orientation