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Infection associated with hydroxyapatite prosthesis and related factors

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Journal of Otology 2010年第1期5卷 24-29页

作者： LIU Yang SUN Jian-jun Center of Otolaryngology of PLA, navy general {2.,{3., China Center of Otolaryngology of PLA Navy General Hospital Beijing 100037 China

Background The purpose of otomicrosurgery in modern times is to achieve complete removal of disease, which is the basis for hearing rehabilitation. Artificial ossicles are important for hearing rehabilitation. One of the materials is hydroxyapatite that acts as ossicular replacement prosthesis (HA prosthesis, PORP & TORP) and is commonly used as substitute bone in clinics. Although HA prostheses feature good biocompatibility, stability and certain resistance to infection, the structure of the material can be decomposed and absorbed. Based upon animal experiments and clinical application, this article explores the infectivity of HA prostheses and influencing factors. Materials and Methods HA prostheses were implanted in the bulla in guinea pigs. Infected HA prostheses were examined under a scanning electron microscope. Ninety patients implanted with HA prostheses were followed for more than 3.months. Five cases that had undergone revision operations were reported. Results Scanning electronic microscopy showed that the normal compact structures had disappeared and become loose in infected HA prostheses, with their micropores infiltrated with effusion, fibrous tissue and inflammatory cells. As a result, the normal ceramic structure was decomposed and the micropores structure disappeared. The infected mesotympanum in the reported cases also led to HA infection. The shape and structure of bone were destroyed, which was visible by visual examination and light microscopy. The process of cholesteatoma recurrence was always associated with infection, although the HA prosthesis was sometimes spared. Conclusion While HA prosthesis is anti-infective to some extent, long-term infection and cholesteatoma recurrence can lead to destruction and decomposition of HA prostheses. Long-term infected middle ear cavity, dysfunctional Eustachian tube, residual and recurrent cholesteatoma and other factors can cause decomposition of HA prosthesis and result in hearing loss.

关键词： Hydroxyapatite prosthesis Infection Cholesteatoma.

Design of secure operating systems with high security levels

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Science in China(Series F) 2007年第3期50卷 399-418页

作者： QING SiHan1,2.& SHEN ChangXiang3.1 Institute of Software, Chinese Academy of Sciences, beijing 100080, China 2.School of Software and Microelectronics, Peking University, beijing 102.00, China 3.Institute of Computing Technology, {2., beijing 100841, China Institute of Software Chinese Academy of Sciences Beijing China School of Software and Microelectronics Peking University Beijing China Institute of Computing Technology Navy Beijing China

Numerous Internet security incidents have shown that support from secure operating systems is paramount to fighting threats posed by modern computing environments. Based on the requirements of the relevant national and international standards and criteria, in combination with our experience in the design and development of the ANSHENG v4.0 secure operating system with high security level （hereafter simply referred to as ANSHENG OS）, this paper addresses the following key issues in the design of secure operating systems with high security levels： security architecture, security policy models, and covert channel analysis. The design principles of security architecture and three basic security models： confidentiality, integrity, and privilege control models are discussed, respectively. Three novel security models and new security architecture are proposed. The prominent features of these proposals, as well as their applications to the ANSHENG OS, are elaborated. Cover channel analysis （CCA） is a well-known hard problem in the design of secure operating systems with high security levels since to date it lacks a sound theoretical basis and systematic analysis approach. In order to resolve the fundamental difficulties of CCA, we have set up a sound theoretical basis for completeness of covert channel identification and have proposed a unified framework for covert channel identification and an efficient backward tracking search method. The successful application of our new proposals to the ANSHENG OS has shown that it can help ease and speedup the entire CCA process.

关键词： secure operating systems with high security levels architecture security model covert channel analysis

Depression,anxiety and influencing factors in Cancer Pain patients and the controls

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Depression,anxiety and influencing factors in Cancer Pain pa...

Experimental Investigation on Viscosity of Cu-H_2. Nanofluids

中华医学会肿瘤学分会第七届全国中青年肿瘤学术会议——中华医学会肿瘤学分会“中华肿瘤明日之星”大型评选活动暨中青年委员全国遴选

作者： Xiao-Mei Li~() 1 beijing Military general {2. 2.Pla navy general {2.

Aim To investigate levels of depression and anxiety and their influencing factors in cancer pain patients and the controls. Methods 3. consecutive cancer paients were enrolled into the investigation of depression and anxiety by the Beck Depression Inventory and State-Trait Anxiety Inventory.3. cancer patients without pain(C1 group) and 3. chronic hypertension patients(C2.group) were enrolled as *** of depression and anxiety

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Journal of Wuhan University of Technology(Materials Science) 2009年第1期24卷 48-52页

作者：李新芳 Department of Packaging & Printing Zhongshan Torch Vocation and Technology College

A procedure for preparing a nanofluid that a solid-liquid composite material consists of solid nanoparticles with sizes typically of 1-100 nm suspended in liquid was proposed. By means of the procedure, Cu-H2. nanofluids with and without dispersant were prepared, whose sediment pho-tographs and particle size distribution were given to illustrate the stability and evenness of suspension with dispersant. The viscosity of Cu-H2. nanofluid was measured using capillary viscometers. The mass fractions（w） of copper nanoparticles in the experiment varied between 0.04% and 0.16% with the temperature range of 3.-70 ℃. The experimental results show that the temperature and SDBS concentration are the major factors affecting the viscosity of the nano-copper suspensions, while the effect of the mass fraction of Cu on the viscosity is not as obvious as that of the temperature and SDBS dispersant for the mass fraction chosen in the experiment. The apparent viscosity of the copper nano-suspensions decreases with the temperature increase, and increases slightly with the increase of the mass fraction of SDBS dispersant, and almost keeps invariability with increasing the mass fraction of Cu. The influence of SDBS concentration on the viscosity of nano-suspension was relatively large comparing with that of the nanoparticle concentration.

关键词： nano-Cu/water suspension SDBS kinematic viscosity capillary viscometer

Study on the Formability of Iron-Based Powder Metal Materials in Plasma Arc Direct Metal Forming Process

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稀有金属材料与工程 2011年第S4期40卷 266-269页

作者： Xia Dan1,Xiang Yonghua2.Xu Binshi 1,Lv Yaohui 11Science and Technology on Remanufacturing Laboratory,beijing 100072.China2.1} Logistics Technology and Equipment Institute of PLA,beijing 100072.China Sci & Technol Remfg Lab Beijing 100072 Peoples R China navy Logist Technol & Equipment Inst PLA Beijing 100072 Peoples R China

The specific Fe-based alloy for direct metal forming was designed and prepared under multi-layer cladding *** powder was designed for getting the better formability,toughness and *** experiment used KR6 robot and NW5000 digital power supply as the hardware *** and hardness of the layer formed by different powder were analyzed by using X-ray diffraction (XRD) and Transmission Electron Microscope (TEM).The result shows that thermal expansion coefficient correlated with processing formability is not *** of the layers is correlated to elements phase of the coatings was formed by γ(FeNi) and α(FeCrNi),and a little Cr2.C6、Fe3.i and MoO2.

关键词： plasma arc direct metal forming iron-based powder

Prognostic factors in the surgical treatment of caudate lobe hepatocellular carcinoma

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World Journal of Gastroenterology 2010年第9期16卷 1123-1128页

作者： Peng Liu,Jia-Mei Yang,Wen-Yang Niu,Tong Kan,Feng Xie,Dian-Qi Li,Ye Wang,Yan-Ming Zhou,Department of Special Treatment and Liver Transplantation,Eastern Hepatobiliary Surgery hospital,Second Military Medical University,Shanghai 2.043.,China Peng Liu,Department of Hepatobiliary Surgery,navy {2. hospital,beijing 10003.,China Department of Special Treatment and Liver Transplantation Eastern Hepatobiliary Surgery Hospital Second Military Medical University Shanghai 200438 China.

AIM:To evaluate the short-and long-term outcomes of liver resection for caudate lobe hepatocellular carcinoma (HCC).METHODS:We retrospectively analyzed 114 consecutive patients with HCC,originating from the caudate lobe,who underwent resection between January 2.01 and January *** and multivariate analyses were performed on several clinicopathologic variables to determine the factors affecting long-term outcome and intrahepatic ***:Overall mortality and morbidity were 0% and 18%,*** a median follow-up of 3. mo (interquartile range,11-66 mo),tumor recurrence had occurred in 76 patients (66.7%).The 1-,3.,and 5-year disease-free survival rates were 65.7%,3..1%,and 18.4%,*** 1-,3.,and 5-year overall survival rates were 76.1%,54.7%,and 3..8%,*** analysis showed that subsegmental location of the tumor (45.7% vs 16.2.,P=0.01),liver cirrhosis (12.3. vs 47.9%,P=0.03.,surgical margin (18.5% vs 54.6%,P=0.04),vascular invasion (3..9% vs 2..2.,P=0.04) and extended caudate resection (42.1% vs 15.4%,P=0.04) were related to poorer long-term *** analysis showed that only subsegmental location of the tumor,liver cirrhosis and surgical margin were significant independent prognostic ***:Hepatectomy was an effective treatment for HCC in the caudate *** subsegmental location of the tumor,liver cirrhosis and surgical margin affected long-term survival.

关键词： Hepatectomy Hepatocellular carcinoma Caudate lobe Prognostic factors

Observation of the Preventive and Therapeutic Effect of Chuanxiong on the Atherosclerosis of Rabbits

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Chinese Journal of Integrative Medicine 1995年第2期1卷 52-55页

作者： Wang Jing(王京), Liu Xue-ru(刘雪如)(general navy {2. , {3. ) ( {3.)Shi Yin-mian (史荫绵 ) (Changhai {2. , Shanghai) (2.043.) general navy {2. Beijing Changhai hospital Shanghai

The authors established experimental atherosclerosis in rabbits by means of combininghyperlipidemia and repeatedly administered intravenously with serum ot other origins to make the im-munopathologic injuries of arterial endothelia in order to observe the preventive and therapeutic effects otChuanxiong on experimental atherosclerosis. The authors observed that Chuanxiong could significantly de-crease the levels of the serum cholesterol and low density lipoprotein (P< 0. 05) , and relieve the extentof atherosclerosis (P< 0. 05). In addition , Chuanxiong could reduce the red cell deformability. This studysuggests that Chuanxiong plays an active role in preventive and therapeutic effect on atherosclerosis.

关键词： rabbits atherosclerosis red cell deformability Chuanxiong

EXISTENCE FORMS AND DISTRIBUTION OF SELENIUM IN BLUE MUSSEL AND BAY SCALLOP

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中国水产科学 1998年第1期 52-56页

作者： Mao Wenjun1) Li Yi2. Guan Huashi1) Lin Hong1) Liu Yuhua3.(Ocean University of Qingdao, 2.6003.1)(401 hospital of {3., 2.6071)2.(Salt Business Agency of Yan Tai, 2.5000)3.

ＥＸＩＳＴＥＮＣＥＦＯＲＭＳＡＮＤＤＩＳＴＲＩＢＵＴＩＯＮＯＦＳＥＬＥＮＩＵＭＩＮＢＬＵＥＭＵＳＳＥＬＡＮＤＢＡＹＳＣＡＬＬＯＰＭａｏＷｅｎｊｕｎ１）ＬｉＹｉ２）ＧｕａｎＨｕａｓｈｉ１）ＬｉｎＨｏｎｇ１）ＬｉｕＹｕｈ... 详细信息

ＥＸＩＳＴＥＮＣＥＦＯＲＭＳＡＮＤＤＩＳＴＲＩＢＵＴＩＯＮＯＦＳＥＬＥＮＩＵＭＩＮＢＬＵＥＭＵＳＳＥＬＡＮＤＢＡＹＳＣＡＬＬＯＰＭａｏＷｅｎｊｕｎ１）ＬｉＹｉ２）ＧｕａｎＨｕａｓｈｉ１）ＬｉｎＨｏｎｇ１）ＬｉｕＹｕｈｕａ３ＯｃｅａｎＵｎｉｖｅｒｓｉｔ...

关键词： Existence forms Distribution Blue mussel Bay scallop

The eastward subtropical countercurrent on isopycnal surface in the western North Pacific

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Science China Earth Sciences 2005年第7期48卷 1065-1073页

作者： LI Rongfeng1, YOU Xiaobao1 & Peter C. Chu2.1. LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, beijing 10002., China 2. Department of Oceanography, Naval Postgraduate School, Monterey, CA 93.43.512., USA LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Department of Oceanography Naval Postgraduate School Monterey CA 93943-5122 United States

The monthly circulations on isopycnal surface in the western North Pacific are calculated based on the navy’s generalized Digital Environmental Model climatological tem- perature and salinity data on a 1/2. × 1/2. grid using a P-vector method. The eastward Sub- tropical Countercurrent (STCC) in the central subtropical gyre has been studied with emphasis on its spatial distribution, vertical structure, volume transport and its nearby eddy phenomenon. The results reproduce the observed feature of STCC, and reveal some new phenomena on isopycnal surface, such as: (1) At σθ = 2..6, there is strong seasonal variability in the distribution, origin and flow status of STCC. There is no STCC in January, February and March. (2. From May to October, a branch of the Kuroshio Countercurrent to the south of Japan merges into STCC, which increases the velocity of STCC and widens its width. (3. The velocity vector field shows that STCC and nearby eddies coexist. (4) The eastward volume transport of STCC across 13..5°E is the strongest in summer with the maximum of 6.9 Sv ( 1 Sv ≡ 106 m3.s?1) in August, and weaker in spring and autumn with 1.7 Sv in April and 1.6 Sv in November. Most of the transports of STCC occur between isopycnal surfaces 2..0σθ and 2..0σθ. (5) The distributions of the zonal flow along 13..5°E show that the flow core of STCC is between 2..3.θ and 2..7σθ .

关键词： P-vector method on isopycnal surface eastward subtropical countercurrent eddy phenomenon.