螺旋CT扫描及MIP、MPR、CPR技术在肋骨骨折诊断的应用价值

目的探讨螺旋CT扫描及三维重建后处理技术诊断肋骨骨折的应用价值。方法对30例肋骨骨折的患者进行螺旋CT扫描及MIP(最大密度投影)、MPR(多平面重建)及CPR(曲面重建)后处理。结果螺旋CT扫描及三维重建后处理技术可清晰、立体、直观、较细致地显示隐形骨折的部位和范围,有利于临床治疗伤情鉴定及以后医疗纠纷的发生。结论螺旋CT扫描及三维重建后处理技术能明显提高肋骨骨折的诊断,弥补了X线平片检查及常规CT检查的不足。     

64排螺旋CT3D重建在鼻部骨折诊断中的应用

目的探讨64排螺旋CT3D重建在诊断鼻部外伤骨折中的准确性及临床应用价值。方法对71例鼻部外伤患者进行64排螺旋CT扫描后运用3D技术重建成像,评价影像诊断鼻骨骨折的准确性。结果 64排螺旋CT3D重建成像可以立体显示骨折的位置、类型、形态和范围。结论 64排螺旋CT3D重建成像对于显示复杂的鼻骨骨折的空间构像关系具有较高的临床诊断价值。     

浅谈胸部外伤的影像学诊断价值

目的胸部外伤的影像学诊断价值探讨.方法对马山县人民医院2010年1月~2011年2月收治的胸部外伤患者34例,首先对患者进行X线检查,然后进行CT检查,比较X线检查和CT检查的检查结果,比较X线检查和CT检查的影像学诊断价值.结果患者经X线检查,查出心包积血1例、创伤性肺囊肿1例、肺血肿3例、肺挫伤3例、胸腔积液5例、肋骨骨折8例,检查结果经病理学分析确诊,准确性为61.76%;患者经CT检查,查出心包积血2例、创伤性肺囊肿3例、肺血肿5例、肺挫伤6例、胸腔积液8例、肋骨骨折10例,检查结果经病理学分析确诊,准确性为100%.X线检查和CT检查的准确性比较,差异显著,P〈0.05,具有统计学意义.结论胸部外伤常见的影像学表现为心包积血、创伤性肺囊肿、肺血肿、肺挫伤、胸腔积液、肋骨骨折等.CT检查全面、安全、可靠.X线检查方便、灵活,但漏检情况较多.X线复查和CT检查均可查找病因,但CT检查比X线检查的诊断价值更高.CT检查能为胸部外伤患者的临床诊断提供准确的影像学资料.     

外伤所致骨盆骨折在多层螺旋CT三维重建后处理中的应用价值

目的探讨研究多层螺旋CT三维后处理,多平面重建(MPR),最大密度投影(MIP)及VR容积在现技术,在外伤所致骨盆骨折中的应用。方法回顾性分析2014年6月至2015年2月收集的30例外伤所致骨盆骨折患者,通过CT三维重建后处理MPR多方位、立体观察骨盆骨折分离、移位情况。结果通MPR、MIP及VR三维后处理能够立体观察骨盆骨折更多信息,30例共50处骨折。结论多层螺旋CT三维重建能够从冠状位、矢状位更准确的观察分析骨盆骨折。     

256层螺旋CT在胸部创伤诊断中的应用价值

目的探讨256层螺旋CT在胸部创伤诊断中的应用价值。方法对2013年1月至12月在我院治疗的92例行256层螺旋CT检查的胸部外伤患者资料进行回顾性分析。结果 92例患者中,40例肋骨骨折,胸椎椎体骨折18例,横突(附件)骨折16例,肩胛骨骨折14例,胸骨骨折4例,胸膜损伤42例。结论 256层螺旋CT及三维重建后可清晰显示胸部损伤的细节特征,是快速、准确诊断胸部创伤的重要方法。     

多层螺旋CT三维重建技术在关节骨折中的应用价值

目的探讨多层螺旋CT(MSCT)三维重建技术在关节骨折中的应用价值。方法使用GEoptima 64排CT对38例关节骨折患者进行图像三维重建,并与X线平片和CT平扫结果进行比较。结果 MSCT三维重建图像可清晰、直观显示关节骨折类型和关节内游离碎骨片,诊断准确率明显高于普通X线平片和CT平片。结论 MSCT重建技术的应用,可明确显示关节骨折情况,有效减少了误诊和漏诊率。     

螺旋CT在尘肺诊断中的价值

目的评价螺旋CT在尘肺影像诊断中的价值。方法分析2010年1月至2011年1月我院确诊并治疗的78例尘肺患者的影像学检查资料,包括X线胸片与螺旋CT,通过对比评价螺旋CT在尘肺影像诊断中的价值。结果对比两组影像学表现可发现,螺旋CT的影像学表现较高仟伏X线胸片清晰,且对于阴影的形态、大小分型明确。对比两组的检查结果发现,对尘肺的检出率上,螺旋CT占有明显的优势,另外螺旋CT对尘肺并发症的检查结果上同样表现出优势性。结论螺旋CT在尘肺影像诊断中可以弥补X线胸片的不足之处,对尘肺的诊断有临床意义。     

40例急性脊柱创伤临床诊断与治疗分析

目的研究并探讨急性脊柱创伤患者的临床诊断与治疗方法。方法对我院2010年2月至2012年2月确诊收治的40例急性脊柱创伤患者的临床诊治资料进行回顾性分析,所有患者均行X线平片、磁共振以及CT扫描检查,确诊急性脊柱创伤后均采用后路椎弓根螺钉内固定的手术方法进行治疗。结果 40例患者中,入院诊断创伤部位在胸椎15例、腰椎23例、胸椎合并腰椎2例,均为爆裂性骨折。手术治疗时间均为120~185min,平均(144.2±15.9)min,术后患者均康复出院,经手术治疗出院后跟踪随访1年,未出现死亡、内固定失败等情况,有3例患者出现轻微并发症,均经治疗后痊愈。结论在急性脊柱创伤患者的临床诊断中,采用X线平片、磁共振以及CT扫描方法进行诊断,对于医院采取正确的治疗措施具有极为重要的价值,是提高患者术后生存率的关键所在。     

多层螺旋CT增强检查诊断肝血管瘤的价值

目的分析多层螺旋CT增强检查在诊断肝血管瘤的价值.方法回顾性分析平舆县人民医院收治并经过病理检查证实的56例肝血管瘤患者的CT资料.结果56例肝血管瘤在经过一般扫描时,共65个病灶,均显示为低密度灶.经过多层螺旋CT扫描后,69个病灶在动脉期出现了病灶结节状边缘;门脉期的患者病灶内增强范围扩大,影像密度均匀并下降;延时期病灶扫描时几乎所有病灶均有强化,密度与肝脏实质近乎相同.仅有5例患者在多层螺旋CT增强检查后未出现上述情况.结论多层螺旋CT增强扫描能清楚地显示肝细胞瘤的影像学特征,对该病的临床诊断和鉴别有重大临床意义.     

64排螺旋CT三维重建在儿童髁突骨折中的临床应用

目的经过64排螺旋CT三维重建明确诊断儿童髁突骨折类型,制定适宜的治疗计划,使患儿达到最佳愈合状态。方法收集自2010年6月至2011年6月就诊的6例儿童髁突骨折患者,全部经64排CT三维重建,明确诊断骨折移位类型及骨短端错位程度,严格选择手术适应证。结果 6例患儿最长9个月,最短1个月时间观察,恢复均良好。结论 64排螺旋CT三维重建应作为下颌髁突骨折的常规检查。     

John Stuart Mill's Theory Of Justice

John Stuart Mill has traditionally been portrayed as self-contradictory and failing to construct a unified social theory. Recent scholarship, however, has challenged this view, finding Mill's work to be creatively synthetic in bridging the antinomies inherent in liberal democratic thought. This revisionist interpretation of Mill is advanced by an understanding of his theory of justice and its role in shaping his policy positions on issues such as welfare, education, voting rights, property rights, taxation, government intervention, and the future of capitalism.     

A Rich Vein for “Reality Mining”北大核心CSSCISSCI

Arik Hesseldahl In the aftermath of the September 11 attacks, U.S. officials quickly turned their attention to other potential targets, including California's Golden Gate Bridge. What would happen if terrorists took down the bridge between San Francisco and Marin County? How much of the region would be affected and for how long?     

John Stuart Mill's Theories of Wealth and Income Distribution

Although he was much influenced by David Ricardo when he wrote the classical part of his Principles , John Stuart Mill was not a Ricardian when he penned his theories of wealth and distribution. They are based on a triple foundation. First, a belief that economics is a moral discipline. Second a theory of custom-driven human behavior. Third, an empirically formed conviction that the institutions of state, education and business cooperate to structure the distribution of income. On the basis of these presuppositions, Mill formulated 1) an institutional theory of the formation of human and non-human wealth and 2) an even more institutional theory of distribution demonstrating how the aforementioned institutions malignantly skew the distribution of income to the advantage of the propertied classes and to the extreme disadvantage of the working class. As a social economist, Mill recommended institutional reforms designed to eradicate the poverty of the working class.     

中国养活自己能力的长期预测:技术和政策分析

中国拥有世界五分之一强的人口 ,收入又在迅速增长。因此 ,国际上很自然地会考虑或推测她在今后的几十年是否有能力养活自己。中国的人口预计将从 2 0 0 0年的 1 2 8亿增长到 2 0 2 0年的 1 4 6亿 ,和 2 0 3 0年的 1 4 9亿。与此同时 ,人均收入的增长将导致对家畜和鱼类产品更大的需求 ,因而对饲料的需求也将有很大的增长     

Toward a Phylogenetic Reconstruction of Organizational Life

Synopsis Classification is an important activity that facilitates theory development in many academic disciplines. Scholars in fields such as organizational science, management science and economics and have long recognized that classification offers an approach for ordering and understanding the diversity of organizational taxa (groups of one or more similar organizational entities). However, even the most prominent organizational classifications have limited utility, as they tend to be shaped by a specific research bias, inadequate units of analysis and a standard neoclassical economic view that does not naturally accommodate the disequilibrium dynamics of modern competition. The result is a relatively large number of individual and unconnected organizational classifications, which tend to ignore the processes of change responsible for organizational diversity. Collectively they fail to provide any sort of universal system for ordering, compiling and presenting knowledge on organizational diversity. This paper has two purposes. First, it reviews the general status of the major theoretical approaches to biological and organizational classification and compares the methods and resulting classifications derived from each approach. Definitions of key terms and a discussion on the three principal schools of biological classification (evolutionary systematics, phenetics and cladistics) are included in this review. Second, this paper aims to encourage critical thinking and debate about the use of the cladistic classification approach for inferring and representing the historical relationships underpinning organizational diversity. This involves examining the feasibility of applying the logic of common ancestry to populations of organizations. Consequently, this paper is exploratory and preparatory in style, with illustrations and assertions concerning the study and classification of organizational diversity.     

Information infrastructure: Who builds broadband networks?

This paper examines the essential difference between the U.S. and Japan, when one considers information infrastructure. There are seven perception gaps between the U.S. and Japan concerning Information Infrastructure policies. These gaps must be understood in order to compare the countries' governmental policies in this area. In looking at the present circumstances, the essential question to answer concerns who is to build, own and operate the network(s) of the infrastructure. Liberalization is certain to be a central factor in the ongoing telecommunications debates. Now that customers have had a taste of the liberalized market-place, the movement toward more open markets will be difficult to stop. When considering options, it is necessary to pay close attention to standardized network access and the increasingly important role software plays. These issues are causing us to take a new approach to the traditional role played by regulators. They also force a closer look at the appropriate structure of utility companies. This paper addresses the above issues in hopes of stimulating dialog on the new telecommunications infrastructure paradigm.     

海岛地区产业演替及资源基础分析--以舟山群岛为例

改革开放以来,舟山市产业构成发生了显著变化,其经济发展过程可以划分为三个阶段。1992年前,是以产业结构渔业占绝对地位的单一结构阶段;1993—1998年,以旅游业为主的第三产业快速发展阶段;上世纪末以来,又进入了新一轮的经济发展时期,即工业产值比重快速增加阶段。根据海岛的自然资源基础和特点,在新世纪的经济发展过程中,舟山市应定位为生态型的港口旅游城市。以港口及临港工业为主导,以海岛旅游和海洋经济为特色,大力发展第二产业和第三产业。海岛地区的主导产业应体现海岛资源优势及区位优势,以集群性环保型产业为主。同时由于海岛地区淡水资源缺乏,主导产业也应着重选择低耗水型产业。     

风险视角下企业治理结构和研发创新——基于委托代理模型的研究

本文基于委托代理模型,从风险的视角研究企业治理结构对研发创新能力的影响。本文构建了一个包含创新活动的委托代理模型进行理论分析,利用动态DEA 模型测算创新能力,并使用2015-2018年我国上市制造业企业数据进行实证检验。实证部分检验了理论结论:委托代理问题不利于企业提升研发创新能力,且客观风险和主观风险厌恶会加剧该负面影响。基于此,本文认为上市企业应根据企业自身研发活动特点有针对性地改善企业治理结构,提出了适当延长代理人任期、推动股权激励计划、提升代理人的风险承担能力等建议。     

生物群落结构原型的仿生学模拟

模拟生命系统管理规律的科学即管理仿生学,是知识时代仿生学研究的新领域与前沿.基于模拟生物群落结构规律的研究目的,采用仿生学模拟的研究方法,以生物群落结构为原型,建立了仿生群落结构模型.结论为:垂直结构、水平结构、时间结构与交错区结构是支持生物群落生命活动的结构规律,以该规律为原型,推理建立了仿生分层结构、仿生优化结构、仿生动态结构与仿生相邻结构,四种仿生结构分别侧重于管理资源的分层管理、局部优化管理、动态过程管理、相邻关系管理,该模型为建立类似生物群落的人造管理系统即仿生群落管理系统提供了仿生结构模型.可以预测,该模型具有广泛的应用价值,能够推动管理仿生学的发展.