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河北省交通企业国有资产管理问题调查研究

交通企业管理 2024年第2期39卷 17-19页

作者：李西文李泽瑶河北经贸大学

经济繁荣助力交通企业发展,交通企业规模日益壮大同时也产生了诸多问题。随着国家治理现代化进程的发展,对如何加强国有资产管理和发挥国有资产价值提出更高要求。通过调研河北交通集团及其下属公司,探讨分析交通企业在组织结构、投资... 详细信息

经济繁荣助力交通企业发展,交通企业规模日益壮大同时也产生了诸多问题。随着国家治理现代化进程的发展,对如何加强国有资产管理和发挥国有资产价值提出更高要求。通过调研河北交通集团及其下属公司,探讨分析交通企业在组织结构、投资管理以及监管意识等方面存在的问题,从明确组织架构和职责分工、资产使用管理规范化以及管理责任强化等方面提出相应建议,优化交通企业国有资产管理体制.

关键词：交通企业国有资产管理动态管理管理责任调查问卷

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我国榛属植物种质资源保存及育苗技术研究进展

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果树资源学报 2024年第2期5卷 110-114页

作者：王祺姚泽卢军义严子柱甘肃临泽荒漠生态系统国家定位观测研究站甘肃临泽734200 甘肃省荒漠化与风沙灾害防治国家重点实验室培育基地甘肃兰州730070 甘肃省治沙研究所甘肃兰州730070

简要介绍了榛子在全世界范围内的分布和栽培发展历史,归纳总结了我国榛属植物种质资源自然分布、描述与评价体系、野生榛和栽培榛种质资源保存和苗木繁育技术研究的现状,分析并提出了我国榛属植物种质资源保存培育和良种繁育技术研究中... 详细信息

简要介绍了榛子在全世界范围内的分布和栽培发展历史,归纳总结了我国榛属植物种质资源自然分布、描述与评价体系、野生榛和栽培榛种质资源保存和苗木繁育技术研究的现状,分析并提出了我国榛属植物种质资源保存培育和良种繁育技术研究中存在的明显不足、技术难题和解决思路,以期为我国榛子产业的发展提供参考。

关键词：榛属植物种质资源保存育苗技术发展现状中国

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Evaluation of D（d,n）^3 He reaction neutron source models for BNCT irradiation system design

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Nuclear Science and Techniques 2007年第6期18卷 330-335页

作者： yao ze＇en LUO Peng Tooru KOBAYASHI Gerard BENGUA School of NuclearScience and Technology Lanzhou University Lanzhou 730000 China Research Reactor Institute Kyoto University Osaka 590-0494 Japan

A mathematical method was developed to calculate the yield,energy spectrum and angular distribution of neutrons from D(d,n)~3He(D-D)reaction in a thick deuterium-titanium target for incident deuterons in energies lower than *** data of energy spectrum and angular distribution were applied to set up the neutron source model for the beam-shaping-assembly(BSA)design of Boron-Neutron-Capture-Therapy(BNCT)using MCNP-4C code. Three cases of D-D neutron source corresponding to incident deuteron energy of 1000,400 and 150 key were inves- *** neutron beam characteristics were compared with the model of a 2.45 MeV mono-energetic and isotropic neutron source using an example BSA designed for BNCT *** results show significant differences in the neutron beam characteristics,particularly the fast neutron component and fast neutron dose in air,between the non-isotropic neutron source model and the 2.5 MeV mono-euergetic and isotropic neutron source model.

关键词：中子源反作用力中子能量放射

深井掘进技术在厚层高渗透性粉细砂层中适用性的数值模拟研究

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科学技术与工程 2024年第8期24卷 3381-3388页

作者：周洁刘成君徐杰张振光李泽垚同济大学地下建筑与工程系上海200092 同济大学岩土及地下工程教育部重点实验室上海200092 上海公路桥梁(集团)有限公司上海200433

科学合理高效开发深层地下空间是城市不断发展的必然趋势与重要难题。深井掘进技术(vertical shaft machine,VSM)是一种开挖超深竖井的新型工法,该技术施作的竖井结构形式简单、结构受力状态好、施工速度快、对周边环境扰动小、适用性广... 详细信息

科学合理高效开发深层地下空间是城市不断发展的必然趋势与重要难题。深井掘进技术(vertical shaft machine,VSM)是一种开挖超深竖井的新型工法,该技术施作的竖井结构形式简单、结构受力状态好、施工速度快、对周边环境扰动小、适用性广泛,可被广泛用于城市深层地下空间的点状开发。以中国首例使用VSM施工的南京市儿童医院沉井停车库项目为原型,建立在砂性土中开挖60 m竖井的数值模型,重点研究VSM竖井在厚层高渗透性的粉细砂层开挖过程的变形情况与开挖面的稳定性问题。数值模型结果表明:60 m竖井开挖过中地表变形量均控制在毫米数量级,且最大地表变形量不超过13 mm;在水位差1 m的水下施工过程中安全系数均较好控制在2.0以上。对于变形问题,分析不同开挖深度下的井底隆起变形和地表变形情况,表明在60 m开挖深度内,使用VSM开挖砂性土竖井在深度、安全性和对周边环境扰动上均具有明显优势。针对开挖面稳定性,计算分析与竖井内外水位差和竖井深度相关的开挖面安全系数,计算结果可用于指导实际施工,实现分段施工与精细化控制。

关键词：深井掘进技术(VSM) 粉细砂数值模型地表变形井底隆起安全系数

Identification of Colletotrichum spp. isolated from strawberry in Zhejiang Province and Shanghai City,China

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第1期11卷 61-70页

作者： Liu XIE Jing-ze ZHANG yao WAN Dong-wei HU Key Laboratory of Molecular Biology of Crop Pathogens and lnsects Ministry of Agriculture Institute of Bioteehnology College of Agriculture and Biotechnology Zhejiang University Hangzhou 310029 China

Strawberry anthracnose, caused by Colletotrichum spp., is a major disease of cultivated strawberry. This study identifies 31 isolates of Colletotrichum spp. which cause strawberry anthracnose in Zhejiang Province and Shanghai City, China. Eleven isolates were identified as C. acutatum, 10 as C. gloeosporioides and 10 as C. fragariae based on morphological characteristics, phylogenetic and sequence analyses. Species-specific polymerase chain reaction （PCR） and enzyme digestion further confirmed the identification of the Colletotrichum spp., demonstrating that these three species are currently the causal agents of strawberry anthracnose in the studied regions. Based on analysis of rDNA internal transcribed spacers （ITS） sequences, sequences of all C. acutatum were identical, and little genetic variability was observed between C. fragariae and C. gloeosporioides. However, the conservative nature of the Mvnl specific site from isolates of C. gloeosporioides was confirmed, and this site could be used to differentiate C. gloeosporioides from C. fragariae.

关键词： Fragariaxananassa Taxonomic identification Colletotrichum acutatum C. gloeosporioides C. fragariae

Microstructure and property of the Ti-24Al-15Nb-1.5Mo/TC11 joint welded by electron beam welding

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 568-575页

作者： Ying-ying Liu ze-kun yao Hong-zhen Guo Hang-hang Yang College of Materials Science and Engineering Northwestern Polytechnical University Xi＇an 710072 China

The Ti-24Al-15Nb-1.5Mo alloy, in the as-forged and heat-treated states, was joined to the as-forged TC 11 titanium alloy by electron beam welding with the heat inputs of 135 and 150 kJ/m. Then the microstructure and property of the Ti-24Al-15Nb- 1.5Mo/TC 11 welding interface were investigated. The results show that the phase constitution of the weld is not related to the heat input, and is mainly composed of α＇ phase. Moreover, the intermetallic phases of TiEAlNb, MoNb, NbaAl, and TiAl3 are formed in the weld zone. Therefore, the microhardness value of the weld zone is higher than that of the other portions in the same sample. The profile of the weld is asymmetrically fimnel-like. The grain sizes of the weld and its heat-affected zones are increased with increasing heat input. There is an obvious difference in the element content of the welding interface; only the alloying elements in the fusion zone reach a new balance during solidification.

关键词： titanium alloys electron beam welding heat input microstructure property

MSCT图像后处理技术在肋骨骨折畸形愈合认定中的应用

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法医学杂志 2024年第4期40卷 324-329页

作者：葛静晨尚敏姚明阳韦铭菲史俊展姚泽伟时佳音李凡河南科技大学基础医学与法医学院河南洛阳471023 郑州大学附属洛阳中心医院周山院区医学影像科河南洛阳471003 河南金剑司法鉴定中心河南洛阳471000 余姚市公安局浙江余姚315400

目的比较容积再现(volume rendering,VR)、多平面重组(multiplanar reformation,MPR)和曲面重组(curved planar reformation,CPR)3种图像后处理技术在肋骨骨折畸形愈合认定中的应用价值。方法记录75例患者肋骨骨折畸形愈合的类型及数... 详细信息

目的比较容积再现(volume rendering,VR)、多平面重组(multiplanar reformation,MPR)和曲面重组(curved planar reformation,CPR)3种图像后处理技术在肋骨骨折畸形愈合认定中的应用价值。方法记录75例患者肋骨骨折畸形愈合的类型及数量,比较VR、MPR、CPR对肋骨骨折畸形愈合诊断的灵敏度、特异度、准确率和约登指数,绘制受试者操作特征(receiver operator characteristic,ROC)曲线并计算曲线下面积(area under the curve,AUC),比较3种图像后处理技术对不同类型肋骨骨折畸形愈合的检出率。结果 75例患者共有243处肋骨骨折畸形愈合。VR、MPR、CPR对肋骨骨折畸形愈合诊断的灵敏度分别为52.67%、79.84%、91.36%,特异度分别为99.58%、97.89%、99.15%,准确率分别为83.66%、91.76%、96.51%,约登指数分别为0.52、0.78、0.91,AUC分别为0.761、0.889、0.953。与VR相比,MPR在断端错合1/3以上、断端重叠、断端成角、骨桥的检出数量上差异有统计学意义(P<0.05);与VR相比,CPR在肋骨骨折畸形愈合各分型的检出数量上差异有统计学意义(P<0.05);与MPR相比,CPR在断端错合1/3以上、断端分离、骨桥的检出数量上差异有统计学意义(P<0.05)。结论 3种图像后处理技术对肋骨骨折畸形愈合的认定均具有重要意义,尤其是CPR对肋骨骨折畸形愈合的诊断效能高,可作为肋骨骨折畸形愈合法医临床鉴定的主要后处理技术。

关键词：法医学肋骨骨折骨折畸形愈合容积再现多平面重组曲面重组

Silver dressing in the management of an infant's urachal anomaly infected with methicillin-resistant Staphylococcus aureus:A case report

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World Journal of Clinical Cases 2022年第8期10卷 2629-2636页

作者： ze-yao Shi Shu-Lin Hou Xiao-Wen Li Department of Neonatology Nursing West China Second University HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina West China School of Nursing Sichuan UniversityChengdu 610041Sichuan ProvinceChina Key Laboratory of Birth Defects and Related Diseases of Women and Children(Sichuan University) Ministry of EducationChengdu 610041Sichuan ProvinceChina

BACKGROUND Symptomatic urachal anomalies are rare *** management of urachal remnants has historically been surgical excision because of the connection between urachal remnants and risk of malignancy development later in ***,recent literature suggests that urachal anomalies that do not extend to the bladder can be treated with conservative *** this case,we report a newborn with an infected urachal remnant who was treated with a combination of antibiotics and a silver-based dressing and finally recovered *** SUMMARY Female baby A,weighing 2.88 kg at 38^(+5) wk of gestational age,was referred to the hospital because of a red,swollen umbilicus approximately 2 cm×2 cm in size with yellow purulent *** physical and ultrasound examination,the baby was finally diagnosed with a urachal *** first used oxacillin to prevent infection for 3 *** the 4^(th) day,microbiology testing of the umbilical exudate revealed the presence of methicillin-resistant Staphylococcus aureus(MRSA).We changed the treatment with oxacillin to vancomycin for systemic infection and treated the umbilical inflammation with a silver sulfate *** 5 d,the symptoms of the umbilicus disappeared,and we discontinued silver dressing *** the 12^(th) day,umbilical exudate testing was negative for *** the 14^(th) day,the baby's blood testing showed a white blood cell count of 14.7×10^(9)/L,neutrophil percentage of 27.8%,and C-reactive protein level of 1.0 mg/L,suggesting that the infection had been *** stopped treatment,and the baby was discharged with no *** this case,the infected urachal anomaly was cured with silver dressing and antibiotic application instead of surgical methods,which was a different course from that of some other urachal remnant *** Anomalies that do not connect with the bladder can be treated with nonoperative management,including application of conservative antibiotics and local i

关键词： Urachal anomaly Infection Neonate Infant Silver dressing Case report

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水声目标的MFCC特征提取与分类识别

计算机仿真 2024年第2期41卷 13-16,33页

作者：葛轶洲姚泽张歆周青通信信息控制和安全技术重点实验室浙江嘉兴314033 中国电子科技集团公司第三十六研究所浙江嘉兴314033 西北工业大学航海学院陕西西安710072

水声目标识别技术在水下信息处理中起着非常重要的作用,从辐射噪声中提取水声目标的有效特征一直都是水声目标识别技术的难点所在。提出了一种利用水声目标辐射噪声的梅尔频率倒谱系数(Mel-Frequency Cepstral Coefficients,MFCC)作为... 详细信息

水声目标识别技术在水下信息处理中起着非常重要的作用,从辐射噪声中提取水声目标的有效特征一直都是水声目标识别技术的难点所在。提出了一种利用水声目标辐射噪声的梅尔频率倒谱系数(Mel-Frequency Cepstral Coefficients,MFCC)作为目标特征提取的方法。通过对辐射噪声信号进行梅尔频率滤波得到目标噪声信号的MFCC特征,它模拟了人耳对不同频率的声音具有不同感知能力的听觉非线性效应,因此具有良好的识别效果。通过对实际水声目标的辐射噪声进行测试实验,提取目标噪声信号的MFCC特征向量,并运用K近邻算法对其进行分类识别,实验结果显示MFCC特征提取与分类识别算法对水声目标的识别率达到85%以上。

关键词：水声信息对抗特征提取梅尔倒谱系数分类识别