检索结果-南通市图书馆

Whole-genome Sequencing Reveals Autooctoploidy in Chinese Sturgeon and Its Evolutionary Trajectories

Genomics, Proteomics & Bioinformatics 2024年第1期22卷 51-65页

作者： Binzhong Wang Bin Wu Xueqing Liu Yacheng Hu Yao Ming Mingzhou Bai Juanjuan Liu Kan Xiao Qingkai Zeng Jing Yang Hongqi Wang Baifu Guo Chun Tan Zixuan Hu Xun Zhao Yanhong Li Zhen Yue Junpu Mei Wei jiang Yuanjin Yang Zhiyuan Li Yong Gao Lei Chen jianbo jian Hejun Du Hubei Key Laboratory of Three Gorges Project for Conservation of Fishes Yichang 443100China Chinese Sturgeon Research Institute China Three Gorges CorporationYichang 443100China Yangtze River Biodiversity Research Center China Three Gorges CorporationWuhan 430014China BGI-Shenzhen Shenzhen 518083China BGI Genomics BGI-ShenzhenShenzhen 518083China Department of Biotechnology and Biomedicine Technical University of DenmarkLyngby 2800Denmark River Basin Complex Administration Center China Three Gorges CorporationYichang 443100China BGI-Sanya BGI-ShenzhenSanya 572025China Yangtze Eco-Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China

The order Acipenseriformes,which includes sturgeons and paddlefishes,represents“living fossils”with complex genomes that are good models for understanding whole-genome duplication(WGD)and ploidy evolution in ***,we sequenced and assembled the first high-quality chromosome-level genome for the complex octoploid Acipenser sinensis(Chinese sturgeon),a critically endangered species that also represents a poorly understood ploidy group in *** results show that *** is a complex autooctoploid species containing four kinds of octovalents(8n),a hexavalent(6n),two tetravalents(4n),and a divalent(2n).An analysis taking into account delayed rediploidization reveals that the octoploid genome composition of Chinese sturgeon results from two rounds of homologous WGDs,and further provides insights into the timing of its ploidy *** study provides the first octoploid genome resource of Acipenseriformes for understanding ploidy compositions and evolutionary trajectories of polyploid fishes.

关键词： Chinese sturgeon Whole-genome sequencing Autooctoploid Polyploidization and diploidization Whole-genome duplication

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

投影域与图像域联合学习重建网络用于重建有限角度胸部CT图像

引用

中国医学影像技术 2024年第9期40卷 1410-1416页

作者：陈杰王克强简建波王鹏吴君张文学天津医科大学总医院放射治疗科天津300052

目的观察双域(投影域与图像域)联合学习重建网络(DDRNet)用于重建胸部有限角度CT图像的价值。方法回顾性收集65例胸部肿瘤患者共4300幅胸部增强CT图像,以DDRNet进行重建,并将三维与二维投影信息融合;评估重建效果,并与单域重建,滤波反... 详细信息

目的观察双域(投影域与图像域)联合学习重建网络(DDRNet)用于重建胸部有限角度CT图像的价值。方法回顾性收集65例胸部肿瘤患者共4300幅胸部增强CT图像,以DDRNet进行重建,并将三维与二维投影信息融合;评估重建效果,并与单域重建,滤波反投影法(FBP)、基于残差的编码/解码网络(RED-CNN)、Resnet+反卷积网络(RDN)及生成对抗网络(GAN)重建结果进行比较。结果DDRNet重建图像峰值信噪比(PSNR)于迭代约60轮后,而投影域和图像域学习网络则于迭代约90轮和80轮后趋于稳定。训练稳定后,相比投影域学习网络,DDRNet和图像域学习网络输出结果波动更小;训练200轮后,DDRNet重建图像PSNR显著高于投影域和图像域学习网络。DDRNet重建图像质量明显优于FBP、RED-CNN、RDN及GAN。结论DDRNet可有效重建高质量胸部有限角度CT图像。

关键词：胸部深度学习体层摄影术,X线计算机

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

共面和非共面VMAT全脑放疗中保护海马及下丘脑-垂体轴的计划质量

引用

中华放射肿瘤学杂志 2024年第7期33卷 634-641页

作者：王克强陈杰简建波王鹏张鑫山张弘扬张文学天津医科大学总医院放射治疗科天津300052

目的比较共面和非共面容积弧形调强放射治疗(VMAT)技术在全脑放疗中保护海马及下丘脑-垂体(HT-P)轴的计划质量差异。方法回顾性分析2021年11月至2023年8月天津医科大学总医院收治的15例行预防性脑照射的患者,参照RTOG-0933及相关指南勾... 详细信息

目的比较共面和非共面容积弧形调强放射治疗(VMAT)技术在全脑放疗中保护海马及下丘脑-垂体(HT-P)轴的计划质量差异。方法回顾性分析2021年11月至2023年8月天津医科大学总医院收治的15例行预防性脑照射的患者,参照RTOG-0933及相关指南勾画海马及HT-P轴,分别设计共面VMAT(co-VMAT)和非共面VMAT(nco-VMAT)计划,处方剂量为30 Gy分10次,利用配对t检验比较两种计划的剂量学指标、计划鲁棒性、计划复杂度及执行效率。结果两种计划均能达到剂量学目标,PTV的D_(2%)、D_(95%)及适形指数(CI)差异没有统计学意义,对于PTV的D^(98%)和均匀性指数(HI),co-VMAT略差于nco-VMAT(D^(98%)为26.37∶26.96 Gy,P=0.001;HI为0.25∶0.24,P=0.002)。co-VMAT中双侧海马的D_(min)为8.55 Gy(左侧)和8.32 Gy(右侧),低于nco-VMAT中的9.31 Gy(左侧)和9.26 Gy(右侧);同时co-VMAT中下丘脑和垂体的D_(mean)低于nco-VMAT计划(下丘脑为11.54∶12.27 Gy,垂体为11.72∶12.1 Gy),差异均有统计学意义(P<0.001)。两种计划中,海马和HT-P轴剂量对误差十分敏感,而PTV和其他危及器官对误差敏感度相对较低。co-VMAT计划比nco-VMAT计划复杂度低,两者在3%/3 mm标准下的γ通过率分别是99.06%±0.60%、98.05%±2.89%。co-VMAT计划的平均出束时间是4.8 min,约为nco-VMAT的2/3,而平均治疗时间为6.3 min,约为nco-VMAT治疗时间的1/2。结论co-VMAT和nco-VMAT均能实现全脑放疗中海马及HT-P轴的保护,co-VMAT计划中靶区的D^(98%)略小,但对海马及HT-P轴的保护更好。两种计划中海马和HT-P轴的剂量都对误差敏感,co-VMAT计划的复杂度更低,执行效率更高,更适合临床治疗。

关键词：放射疗法,调强适形容积弧形调强放射治疗共面全脑放射疗法海马及下丘脑-垂体轴计划鲁棒性计划复杂度执行效率

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

电场治疗联合放疗中贴片阵列对放疗剂量学的影响

引用

中华放射肿瘤学杂志 2024年第5期33卷 438-445页

作者：王克强陈杰简建波王鹏张鑫山张弘扬张文学天津医科大学总医院放射治疗科天津300052

目的研究胶质母细胞瘤(GBM)电场治疗(TTF)的电场贴片阵列对同步放疗的剂量学影响。方法构建TTF阵列对放疗剂量影响的准确模拟计算策略,包括建立TTF阵列的准确勾画方法、确定TTF阵列的相对电子密度(RED)及验证治疗计划系统(TPS)剂量算法... 详细信息

目的研究胶质母细胞瘤(GBM)电场治疗(TTF)的电场贴片阵列对同步放疗的剂量学影响。方法构建TTF阵列对放疗剂量影响的准确模拟计算策略,包括建立TTF阵列的准确勾画方法、确定TTF阵列的相对电子密度(RED)及验证治疗计划系统(TPS)剂量算法对TTF阵列的计算精准性。在此基础上,评估TTF阵列对10例GBM患者临床放疗计划的剂量学影响;进而比较不同能量射束在佩戴TTF阵列放疗中的剂量学差异。差异分析根据差值是否服从正态分布选择配对t检验或Wilcoxon符号秩检验。结果通过设计Mim工作流,实现了TTF阵列的自动勾画,勾画结果和标准勾画相比,戴斯相似性系数为0.93,Jaccard相似系数为0.87。对比TTF阵列对百分深度剂量(PDD)影响的测量结果和TPS模拟结果,确定了TTF阵列的RED为3.3。对不同深度面剂量的测量结果和TPS计算结果进行γ分析,发现在3%/3 mm标准下,4 mm和5.1 cm深度的γ通过率分别为96.64%和94.55%,表明TPS剂量算法对TTF阵列的计算准确性可以满足临床需要。在GBM临床放疗计划中,TTF阵列会使靶区剂量降低1%左右,头皮剂量升高约5%,而对其他危及器官影响很小。佩戴TTF阵列时,10 MV放疗计划的靶区剂量比6 MV计划高0.3%,而头皮剂量比6 MV计划低3%左右。结论本研究构建的TTF阵列对放疗剂量影响的准确模拟策略可以保证模拟计算的精准性,在GBM电场治疗联合放疗中,TTF阵列对靶区剂量影响不大,但会显著增加头皮剂量,而高能射束可以降低TTF阵列的影响。

关键词：放射疗法肿瘤电场治疗电场贴片阵列自动勾画相对电子密度射束能量

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Overvoltage Calculation Method for Sending System Under DC Fault Disturbance Considering the Influence of Renewable Energy

引用

CSEE Journal of Power and Energy Systems 2024年第5期10卷 1865-1875页

作者： Haoyue Gong jianbo Guo Qiang Guo jian Zhang Qinyong Zhou Libo Zhang China Electric Power Research Institute Beijing 100192China

Bipolar blocking and commutation failure in the renewable energy transmission system through ultra-high voltage direct current will produce significant temporary *** paper analyzes the physical process of sending end grid overvoltage caused by two types of DC faults and establishes a DC overvoltage model considering renewable energy *** to characteristics of the sending end grid,the influence of the system equivalent impedance,the proportion of renewable energy output,the active and reactive power coefficients of the renewable energy sources during the low voltage ride through process on the overvoltage is analyzed respectively,and the relationship between the proportion of renewable energy output and the short-circuit ratio under the overvoltage constraint is *** validity and practicality of the model and analysis method proposed in this paper are verified by combining the typical transmission system at the sending end of the actual power grid and regional power grid systems.

关键词： Bipolar blocking commutation failure low voltage ride through renewable energy temporary overvoltage

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Study on frictional behavior of SiC_(f)/SiC composite clad tube clamping condition under nuclear irradiation

引用

Friction 2024年第5期12卷 919-938页

作者： Chenglong XIAO Liangliang SHEN Tianqi ZHU jianbo TANG Ximing XIE Xinyu FAN jian XU Zhiying REN School of Mechanical Engineering Zhejiang University of TechnologyHangzhou310023China Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo315201China State Key Laboratory of Fine Chemicals Liaoning High-Performance Polymer Engineering Research CenterSchool of Chemical EngineeringDalian University of TechnologyDalian116024China School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou350116China School of Computer Science and Technology Shandong UniversityQingdao266237China Aviation Industry Corporation of China Ltd.Beijing100028China

Silicon carbide fiber reinforced silicon carbide matrix(SiC_(f)/SiC)composite is the key cladding material of nuclear fuel,which determines the safety and reliability of nuclear fuel storage and *** replacement of its storage and transportation scenario needs to be completed by the manipulator,but the application of SiC_(f)/SiC wear,fracture,and nuclear leakage in the snatching process of brittle-flexible-rigid contact in the irradiation environment has been seriously restricted due to unclear understanding of the damage ***,the effects of irradiation dose and clamping load on the friction characteristics of the contact interface between SiC_(f)/SiC clad tube are studied in this paper,and the effects of irradiation parameters and clamping force on the static friction coefficient of the contact interface between the clad tube and flexible nitrile are *** on the Greenwood-Williamson tribological model,a numerical model of the shape and structure of the contact micro-convex at the micro-scale of the clamping interface is constructed by introducing the multi-surface integral,and finally verified by *** research results show that there is a unique“Irradiation suppression zone”under the clamping condition of SiC_(f)/SiC cladding tube under the nuclear irradiation environment,and the growth of static friction coefficient slows down until stagnates after irradiation reaches a certain extent(600 kGy),and there will be a decline when the irradiation dose continues to increase,among which the clamping force of 15.2 N within the irradiation interval of 1,000 kGy can meet the safety of nuclear environment *** results of this paper can provide an important theoretical basis and application guidance for the safe operation of SiC_(f)/SiC cladding tubes in the storage and transportation clamping process.

关键词： SiC_(f)/SiC Clad tube nuclear irradiation conditions Greenwood-Williamson tribological model multi-surface integral

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Emergent Geometry of KP Hierarchy

引用

Acta Mathematica Sinica,English Series 2024年第1期40卷 3-25页

作者： jian ZHOU Department of Mathematical Sciences Tsinghua UniversityBeijng 100084P.R.China

We explain how to construct a quantum deformation of a spectral curve associated to a tau-function of the KP *** construction is applied to Witten-Kontsevich tau-function to give a natural explanation of some earlier ... 详细信息

关键词： KP hierarchy tau-functions spectral curves

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Development in oxide metallurgy for improving the weldability of high -strength low-alloy steel-Combined deoxidizers and microalloying elements

引用

International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1263-1284页

作者： Tingting Li jian Yang State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

The mechanisms of oxide metallurgy include inducing the formation of intragranular acicular ferrite(IAF)using micron-sized inclusions and restricting the growth of prior austenite grains(PAGs)by nanosized particles during *** chaotically oriented IAF and refined PAGs inhibit crack initiation and propagation in the steel,resulting in high impact *** work summarizes the com-bined effect of deoxidizers and alloying elements,with the aim to provide a new perspective for the research and practice related to im-proving the impact toughness of the heat affected zone(HAZ)during the high heat input *** complex deoxidation with other strong deoxidants,such as Mg,Ca,Zr,and rare earth metals(REMs),can improve the toughness of the heat-affected zone(HAZ)by re-fining PAGs or increasing IAF ***,it is difficult to identify the specific phase responsible for IAF nucleation because ef-fective inclusions formed by complex deoxidation are usually *** alloying elements,such as C,Si,Al,Nb,or Cr,con-tents can impair HAZ toughness.A high C content typically increases the number of coarse carbides and decreases the potency of IAF ***,Cr,or Al addition leads to the formation of undesirable *** reduces the high-temperature stability of the ***,V,and B can enhance HAZ ***-containing precipitates present good thermal *** or V(C,N)is ef-fective in promoting IAF nucleation due to its good coherent crystallographic relationship with *** formation of the B-depleted zone around the inclusion promotes IAF *** interactions between alloying elements are complex,and the effect of adding dif-ferent alloying elements remains to be *** the future,the interactions between various alloying elements and their effects on ox-ide metallurgy,as well as the calculation of the nucleation effects of effective inclusions using first principles calculations will become the focus of

关键词： oxide metallurgy technology heat affected zone high-strength low-alloy steel intragranular acicular ferrite microalloying element

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Editorial of special issue on the 20th anniversary of Wuhan National Laboratory for Optoelectronics(WNLO)

引用

Chinese Optics Letters 2024年第2期22卷 1-2页

作者： jian Wang WNLO Huazhong University of Science and Technology

On the occasion of the 20th anniversary of the founding of Chinese Optics Letters,Wuhan National Laboratory for Optoelectronics(WNLO)has also gone through 20 *** is one of six national research centers approved by the Ministry of Science and Technology of China in *** predecessor was Wuhan National Laboratory for Optoelectronics(preparatory),one of five national laboratories approved for preparatory construction by the Ministry of Science and Technology of China in November *** was jointly built by the Ministry of Science and Technology of China,Ministry of Education of China,Hubei Provincial Government,and Wuhan Municipal Government.

关键词： jointly anniversary Wuhan

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Novel rockburst prediction criterion with enhanced explainability employing CatBoost and nature-inspired metaheuristic technique

引用

Underground Space 2024年第6期19卷 101-118页

作者： Yingui Qiu jian Zhou School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Rockburst is a major challenge to hard rock engineering at great *** and timely assessment of rockburst risk can avoid unnecessary casualties and property *** the existence of various methods for rockburst assessment,there remains an urgent need for a comprehensive and reliable criterion that is easy to both apply and *** a new rockburst criterion based on simple parameters can potentially fill this *** its advantages,this criterion can facilitate a more effective and efficient prediction of rockburst potential,thereby contributing significantly to enhancing safety *** this paper,combined with the internal and external factors of rockburst,four control variables(i.e.,integrity index,stress index,brittleness index,and elastic energy index)were selected to be incorporated into a comprehensive rockburstability index(RBSI).Based on 116 sets of rockburst cases,the rockburst potential was accurately quantified and predicted using the categorical boosting(CatBoost)model and the nature-inspired metaheuristic African vultures optimization algorithm(AVOA).In its performance validation,the criterion achieved the highest accuracy of 90.48%,verifying the reliability and effectiveness of the proposed RBSI ***,an interpretive method was applied to analyze the variable influence on the criterion,facilitating the explanation of predictions and the analysis of the formula’s robustness under different *** general,compared with existing criterion methods involving relevant indicators,the newly proposed RBSI criterion enhances the accuracy of rockburst potential prediction,and it can effectively and swiftly evaluate the preliminary risk of ***,a graphical user interface was developed to provide a clear visualization of the assessment of rockburst potential.

关键词： Rockburst criterion CatBoost Metaheuristic optimization Model interpretation Graphical user interface

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：