多层螺旋CT在急性胰腺炎诊断中的应用价值

目的:探讨16层螺旋CT对急性胰腺炎的诊断价值.方法:回顾性分析40例经临床及CT证实的急性胰腺炎病例的临床表现及CT影像学改变.结果:临床症状和体征包括急性及弥漫性上腹疼痛、呕吐,均伴有血、尿胰酶及淀粉酶增高.CT检查表现为胰腺体积增大31例;密度改变18例;胰腺包膜改变11例;胰周间隙渗出26例;肾旁筋膜增厚及脾肾间隙模糊32例;并发假囊肿7例;少量腹腔积液4例等影像学改变.结论:螺旋CT对急性胰腺炎及炎症累及范围显示细微、准确,其有效特征性表现对临床诊断及治疗方案提供具有重要依据.     

急性胰腺炎的CT与临床

探讨螺旋CT在急性胰腺炎诊断中的价值;回顾性分析36例螺旋CT扫描和临床资料完整的急性胰腺炎,全部病例均行螺旋CT平扫;水肿性胰腺炎27例,出血坏死性胰腺炎9例。其中2例死亡。按CT Balthazar分级:A级4例;B级11例;C级12例;D级5例;E级4例。螺旋CT在急性胰腺炎的早期诊断、动态观察和预后判断方面有重要价值。     

直肠灌水后CT增强显像在直肠癌诊断中的应用价值

目的 探讨直肠灌水后CT增强显像在直肠癌诊断中的应用价值.方法 选择临床高度怀疑直肠癌的病例46例,先用生理盐水进行直肠灌注后,再行盆腔的CT增强扫描,利用三维重建技术对直肠病变进行诊断,并将所得结果与肠镜活检病理或术后病理结果对照,以判断直肠灌水后CT增强显像对直肠癌诊断的准确率,以及评估直肠肿块局部浸润情况与术后病理的符合率.结果 46例病例中,CT增强显像阳性为43例,阴性为3例.其中CT显像病变侵犯肌层,但未突破浆膜层25例;突破浆膜层10例;周围组织侵犯8例;病理确诊为直肠癌有42例.CT增强显像假阴性1例,假阳性2例,CT增强融合显像对直肠癌诊断的准确性为93.48%,局部侵犯的符合率为98%.结论 直肠灌注后CT增强融合显像在直肠癌的诊断及判断肿瘤局部侵犯情况中具有重要的临床价值.     

直肠灌水后CT增强显像在直肠癌诊断中的应用价值

目的探讨直肠灌水后CT增强显像在直肠癌诊断中的应用价值。方法选择临床高度怀疑直肠癌的病例46例,先用生理盐水进行直肠灌注后,再行盆腔的CT增强扫描,利用三维重建技术对直肠病变进行诊断,并将所得结果与肠镜活检病理或术后病理结果对照,以判断直肠灌水后CT增强显像对直肠癌诊断的准确率,以及评估直肠肿块局部浸润情况与术后病理的符合率。结果46例病例中,CT增强显像阳性为43例,阴性为3例。其中CT显像病变侵犯肌层,但未突破浆膜层25例;突破浆膜层10例;周围组织侵犯8例;病理确诊为直肠癌有42例。CT增强显像假阴性1例,假阳性2例,CT增强融合显像对直肠癌诊断的准确性为93.48%,局部侵犯的符合率为98%。结论直肠灌注后CT增强融合显像在直肠癌的诊断及判断肿瘤局部侵犯情况中具有重要的临床价值。     

腹腔内巨大囊性占位性病变的CT诊断困境探讨

目的分析腹腔内巨大囊性占位性病变的CT表现,并重点探讨其在CT诊断方面的价值.病灶体积较大失去了原病灶的典型影像表现容易导致判断失误和误诊.方法搜集经手术病理证实的巨大囊性占位性病变共14例,其中腹腔内囊腺瘤8例,其中1例为超级巨大型;囊腺癌2例;子宫内膜异位囊肿2例;肠系膜囊肿2例.所有病例都经过平扫,部分经过平扫加增强扫描或三维重建.结果:14例病人都诊断为囊腺瘤,腹腔内囊腺瘤的正确诊断例数为8例,其中4例未做增强扫描,诊断困难,有2例误诊.结论:腹腔内巨大囊性占位性病变具有相似的CT特征,在病灶体积较大的情况下病灶失去了部分典型影像表现,从而对疾病的正确诊断带来一定的困难,尤其在定位定性诊断上经验不足,认识这些困难有助于掌握巨大囊性占位性病变在疾病发展中的一般规律.     

螺旋CT双期增强扫描诊断原发性肝细胞癌的临床分析(附42例报告)

目的探讨原发性肝细胞癌的螺旋CT双期增强特征及其诊断意义。方法回顾性分析42例原发性肝细胞癌螺旋CT双期增强扫描表现。结果42例病灶,平扫呈低密度或等密度;双期增强40例有强化,2例无明显强化,病灶强化密度呈＂早进早出＂的变化特点。结论螺旋CT双期扫描可充分反映原发性肝细胞癌的特征,对肝癌的检出和定性准确率的提高有重要价值。     

螺旋CT双期增强扫描诊断原发性肝细胞癌的临床分析(附42例报告)

目的探讨原发性肝细胞癌的螺旋CT双期增强特征及其诊断意义。方法回顾性分析42例原发性肝细胞癌螺旋CT双期增强扫描表现。结果42例病灶,平扫呈低密度或等密度;双期增强40例有强化,2例无明显强化,病灶强化密度呈"早进早出"的变化特点。结论螺旋CT双期扫描可充分反映原发性肝细胞癌的特征,对肝癌的检出和定性准确率的提高有重要价值。     

螺旋CT双期增强扫描在胰腺癌诊断中的价值

目的 :探讨螺旋CT双期增强扫描诊断胰腺癌的价值。方法 :16例胰腺癌患者行螺旋CT双期增强扫描 ,动脉期延迟 2 5s,门静脉期延迟 60s ,以 3mL/s团注造影剂 80～ 10 0mL。测量肿瘤和正常胰腺组织的CT值 ,计算肿瘤 -胰腺密度差 ,同时对胰腺周围血管进行观察评价。结果 :肿瘤的平均CT值动脉期和门静脉期分别为 (4 7± 8)HU、(5 3± 10 )HU ;正常胰腺动脉期和门静脉期的CT值分别为 (10 9± 16)HU ,(76± 13)HU ;肿瘤 -胰腺密度差动脉期和门静脉期各为 (70± 18)、(2 3± 12 )HU ,二者差异明显 (P <0 0 1)。胰周动脉侵犯在动脉期显示好 ,静脉侵犯在门静脉期显示好。结论 :螺旋CT双期增强扫描动脉期可获得最大的肿瘤 -胰腺密度差 ,动脉期结合门静脉期对胰周血管侵犯的评价更全面 ,提高了胰腺癌手术可切除性评价的准确性。     

胰腺外伤的诊治37例分析

目的:回顾分析胰腺外伤患者的临床表现与治疗方法,总结胰腺外伤的诊治经验.方法:收集37例胰腺外伤的病例资料进行回顾性分析.所有患者均行急诊手术,根据胰腺损伤程度选择治疗的不同术式:清创引流、远端胰腺与脾切除、远端或近端胰腺空肠吻合及胰十二指肠切除术.结果:治愈34例(治愈率91.9%),死亡3例(死亡率8.1 %);胰漏发生8例(发生率21.2%),胰腺假性囊肿8例,胰周脓肿10例,应激性溃疡5例,出血坏死胰腺炎4例,多器官功能衰竭(MOF)8例.结论:胰腺外伤的诊断是否及时、胰腺损伤与其并发症的严重程度及治疗恰当与否是影响预后的关键.     

螺旋CT在胰腺癌诊断中的应用

目的　探讨螺旋CT双期扫描在胰腺癌诊断中的应用价值.方法　螺旋CT双期扫描胰腺癌30例,先平扫,再以3mL/s速度注射对比剂100mL,分别行胰腺期(注射后30～35s)和肝脏期(注射后65～70s)扫描,并测量各扫描期肿瘤和正常胰腺组织的CT值,计算出肿瘤 胰腺的密度差.结果　正常胰腺组织的平均CT值,在胰腺期和肝脏期分别为(119±17)Hu,(99±16)Hu,而肿瘤组织的平均CT值分别为(51±18)Hu,(61±12)Hu,胰腺 病灶增强差值分别为(66±28)Hu,(37±24)Hu,二者之间有显著差别.结论　螺旋CT双期扫描在胰腺癌诊断中具有重要的临床价值.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to