检索结果-南通市图书馆

Discovering statistics : brief version

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Discovering statistics : brief version

gOLOMB's CONJECtURE Is tRUE FOR CERtAIN CLAssEs OF FINItE FIELDs

2011年

作者： Daniel t. Larose instructor''s edition material written by Daniel t. Larose Christina Morian and Lloyd Jaisingh.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Chinese science Bulletin 1983年第10期28卷 1310-1312页

作者：张肇健 REED I.s. Department of Electrical Engineering University of Southern California USA Department of Electrical Engineering University of Southern California USAolomb recently made the following conjecture: In any finite field GF(p~n) where p is a prime integer there exist two primitive elements with a sum equal to one the unit element of the field. The purpose of this note is to establish some special cases of Golomb's conjecture. To achieve this the following theorem is used. Theorem 1. Let c=φ(m) and let q_1q_2…q_k be the different prime divisors

golomb recently made the following conjecture: In any finite field, gF（pn）, where p is a prime integer, there exist two primitive elements with a sum equal to one, the unit element of the field. the purpose of this note is to establish some special cases of golomb’s conjecture. to achieve this, the following theorem is used. theorem 1. Let c=φ（m） and let q1,q2,…,qk be the different prime

关键词： integer conjecture CLAssEs tRUE primitive smallest 吕习 residue

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

DWI“蒂征”有助于预测t1期膀胱癌进展

国际医学放射学杂志 2019年第5期 624-625页

作者： s.Yajima s.Yoshida t.takahara Y.Arita H.tanaka Y.Waseda 赵一婷 Department of Urology Tokyo Medical and Dental University

摘要目的评价扩散加权成像(DWI)上的"蒂征"对于t期膀胱癌复发和进展的预测价值。材料与方法回顾性分析2007—2016年经尿道膀胱肿物切除术确诊病理分期为t

关键词： DWI 肿瘤进展 t1

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

一种新型的高精度分流阀

液压与气动 1982年第1期 61-63页

作者： D.s.Kwan ,g.J.schoenau ,R.t.Burton ,J.N.Wilson ,方君甫 ,李文

分流阀是用于两个或多个执行器速度同步控制的一种装置。现有市售分流阀采用滑阀或旋转齿轮作分流,其分流误差一般为5%～10%。在许多应用场合里,这样大的误差是不能接受的。本文讨论一种两级滑阀式分流阀的结构与性能,其分流误差在很宽... 详细信息

分流阀是用于两个或多个执行器速度同步控制的一种装置。现有市售分流阀采用滑阀或旋转齿轮作分流,其分流误差一般为5%～10%。在许多应用场合里,这样大的误差是不能接受的。本文讨论一种两级滑阀式分流阀的结构与性能,其分流误差在很宽的压力与流量范围内小于1%。该阀的基本部分是主阀芯和补偿缸,二者相互连接形成主阀芯的反馈控制系统。

关键词：分流阀市售压降主阀芯滑阀分流误差高精度

MR弹性成像在儿童和青年肝病病人肝纤维化中的诊断价值

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2018年第4期 479-480页

作者： A.t.trout R.M.sheridan s.D.serai s.A.Xanthakos W.su B.Zhang 刘小新 Department of Radiology Cincinnati Children’s Hospital Medical Center

目的评估MR弹性成像对肝硬化的诊断价值,以评估儿童和年轻成年人肝纤维化病人的肝纤维化情况。材料与方法这项回顾性研究排除了肝移植或进行了Fontan缓解的先天性心脏病病人,纳入2012年1月—2016年9月间在3个月内进行MR弹性成像和肝活检... 详细信息

目的评估MR弹性成像对肝硬化的诊断价值,以评估儿童和年轻成年人肝纤维化病人的肝纤维化情况。材料与方法这项回顾性研究排除了肝移植或进行了Fontan缓解的先天性心脏病病人,纳入2012年1月—2016年9月间在3个月内进行MR弹性成像和肝活检的21岁以下病人。MR弹性成像检查由1位独立观察者进行影像分析。病理标本由1位病理学专家独立对脂肪变性（脂肪含量≥5%肝细胞）和纤维化分期进行评分。采用受试者操作特征（ROC）曲线来评估诊断效能。结果共纳入86例病人,其中男49例（57%）,年龄0.3～20.6岁,平均14.2岁。51例病人（59.3%）肝纤维化Ludwig分期≥2期;44例病人（51.2%）有肝脂肪变性。Ludwig分期为0-1期与≥2期的纤维化之间的ROC曲线下面积为0.70（95%CI:0.59～0.81）。相对于无肝脏脂肪变性的病人[0.82（95%CI:0.67～0.96）],肝脏脂肪变性病人的ROC曲线下面积更低,且差异有统计学意义[0.53（95%CI:0.35～0.71）,P=0.014]。所有病人的最佳刚度临界值为2.27 k Pa时,敏感度为68.6%（95%CI:57.2%80.1%）,特异度74.3%（95%CI:63.5%85.1%）;临界值为1.67 k Pa时,敏感度为35.3%（95%CI:23.5%47.1%）,特异度为91.4%（95%CI:84.5%98.3%）。结论在儿童和年轻成年人中,MR弹性成像对鉴别未发生肝脂肪变性病人的肝纤维化0-1期和≥2期的病人的能力显著优于区分肝脏脂肪变性病人的肝纤维化分期。这表明在非酒精性脂肪肝病人中存在脂肪变性和炎症的混杂效应。

关键词：弹性成像脂肪变性肝纤维化诊断价值 MR

Functional optoacoustic neuro-tomography for scalable whole-brain monitoring of calcium indicators

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light(science & Applications) 2016年第1期5卷 288-294页

作者： X Luís Deán-Ben gali sela Antonella Lauri Moritz Kneipp Vasilis Ntziachristos gil g Westmeyer shy shoham Daniel Razansky Institute for Biological and Medical Imaging(IBMI) Helmholtz Center MunichNeuherbergGermany Institute of Developmental genetics Helmholtz Center MunichNeuherbergGermany Department of Medicine Technical University of MunichMunichGermany Department of Biomedical Engineering Technion-Israel Institute of TechnologyHaifaIsrael

Non-invasive observation of spatiotemporal activity of large neural populations distributed over entire brains is a longstanding goal of *** developed a volumetric multispectral optoacoustic tomography platform for imaging neural activation deep in scattering *** can record 100 volumetric frames per second across scalable fields of view ranging between 50 and 1000 mm^(3) with respective spatial resolution of 35–200μ*** performed in immobilized and freely swimming larvae and in adult zebrafish brains expressing the genetically encoded calcium indicator gCaMP5g demonstrate,for the first time,the fundamental ability to directly track neural dynamics using optoacoustics while overcoming the longstanding penetration barrier of optical imaging in scattering *** newly developed platform thus offers unprecedented capabilities for functional whole-brain observations of fast calcium dynamics;in combination with optoacoustics'well-established capacity for resolving vascular hemodynamics,it could open new vistas in the study of neural activity and neurovascular coupling in health and disease.

关键词： functional neuro-imaging genetically encoded calcium indicators high spatiotemporal resolution large-scale brain activity optoacoustic tomography photoacoustics real-time imaging

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

1992年度选矿年评

有色矿山 1993年第1期22卷 29-40页

作者： s.t.Hall 李怀先王家骧

成功的选矿工程师,必须奋力达到许多重要目标,他的成品应当是高质量的,也即令人满意的,适合销路的,在用户接受限度内的,他的工艺方法要为环境所允许,符合不断变化的规章要求,他取得的效益得不断提高,以补偿持续增长的经营成本。为了有... 详细信息

成功的选矿工程师,必须奋力达到许多重要目标,他的成品应当是高质量的,也即令人满意的,适合销路的,在用户接受限度内的,他的工艺方法要为环境所允许,符合不断变化的规章要求,他取得的效益得不断提高,以补偿持续增长的经营成本。为了有助于实现这些目标。

关键词：选矿计算机磨矿筛分浮游选矿

维普期刊数据库

Reduced antioxidant level and increased oxidative damage in intact liver lobes during ischaemia-reperfusion

在线全文

学校读者我要写书评

暂无评论

World Journal of gastroenterology 2006年第7期12卷 1086-1091页

作者： LászlóVáli gabriella taba Kláraszentmihályi HedvigFébel tímeaKurucz Zsolt Pallai PéterKupcsulik AnnaBlázovics Department of of Medicine Semmelweis UniversityBudapestHungary Chemical Research Center Hungarian Academy of Sciences Research Institute for Animal Breeding and Nutrition HerceghalomHungary Department of surgery Semmelweis UniversityBudapestHungary

AIM： to determine whether increased blood flow of the liver can cause oxidative stress and hepatocyte damage, and to elaborate methods suitable for measuring the antioxidant defence during hepatic surgery on rat model.MEtHODs： In nembutal narcosis, the left lateral and the medial lobes of the liver were clipped for 45 rain to make the total blood supply flow through the other lobes. total antioxidant status, glutathione peroxidase and superoxide dysmutase activity, as well as the concentrations of diene conjugates and free sulphydril groups, H-donating ability and reducing power of the liver samples were determined. Chemiluminescent intensity of the liver was also measured. Metal ions （Al, Ca, Cu, Fe, Mg, Mn, Zn） and P and s concentrations of the liver were determined with an inductively coupled plasma optical emission spectrometer and se content was measured by cathodic stripping voltammetry.REsULts： glutathione peroxidase and superoxide dysmutase activities of the liver decreased significantly in the hyperemia group compared to those observed in the sham operated group. the level of total antioxidant status was also significantly lower in the hyperemia group. H-donating ability, reducing power and free sulphydril group concentration showed the same tendency. A significant correlation （P〈0.05） was found between the changes in non-specific antioxidant activities. this pointed to simultaneous activity of the antioxidant defence system. Al, Cu, Mn, Zn, and s were lower in the hyperemia group than in the sham operated group when the levels of Ca, Fe, Mg, se and P ions were higher during hyperemia.CONCLUsION： Oxidative stress is one of the main factors for the injury of intact liver lobes during ischaemia-reperfusion.

关键词： Free radicals Liver Oxidative stress Metal elements Redox-balance

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

基于人工智能的胸片房颤检测

国际医学放射学杂志 2022年第6期45卷 739-740页

作者： t.Matsumoto s.Ehara s.L.Walston Y.Mitsuyama Y.Miki D.Ueda 杨淑杰

摘要目的旨在建立一种基于人工智能（AI）的胸片房颤（AF）特征检测模型。方法该回顾性研究连续收集 2016 年7 月—2019 年 5 月期间在该机构进行超声心动图检查病人

关键词：