基于Borel亚循环拓扑的无线传感器网络路由算法

利用Borel矩阵群以及群论中的半直积方法构建了一个对称性强、直径小、聚集系数高的5正则Borel亚循环图,将无线传感器网络结点嵌入到该亚循环图中,提出了一种确定性的以数据为中心的数据存储及路由算法,并将所设计的拓扑结构与现有的基于Chord的CSN(Chord for Sensor Networks)以及VRR(Virtual Ring Routing)进行了对比.结果表明,与现有的一些算法相比,所设计的拓扑结构在平均查询长度、路由表大小、平均端到端时延以及能量耗散等方面都有一定优势,有利于延长传感器网络结点的寿命.

SAP系统BASIS数据清理研究

SAP的BASIS数据是指SAP系统在运行过程中因为管理需要而产生的大量系统日志、管理信息等非业务数据，这些数据主要用于系统排错和操作追踪，所以这些数据并不具有长时间的保存价值。如果SAP系统使用很长一段时间，没有对这些数据做任何清理，他们会占用庞大的数据库空间，并导致空间浪费、性能降低问题、备份时间和数据库恢复时间大大延长，从而增加了系统运行风险。

新技术新产品

1996年:能辨别声音的文字处理机将问世,第五代电脑正式应用。 1997年:艾滋病终于有了有效的治疗方法。 1998年:有推理及学习能力的微机电脑逐渐流行;机器人能在核心反应器内进行精密的技术工作。 1999年:家庭电视电话流行,发展超荷三度空间的彩电。 2000年:运用经济的方法从3000米以下的海床采探石油。 2001年:开发出手表大小的电视;无人蔬菜工厂投入使用。 2002年:电动汽车和办公室内自动翻译机逐渐流行。

首家摄像传感器企业动工

一个如手表大小的芯片插入手机,手机便可以当数码相机使用。我国首家摄像传感器生产企业华威国际(上海)有限公司,日前在上海松江开发区破土动工。 华威公司首期投资3000万美元,占地面积1.4万m^2,今年9月投产后将专业从事摄像传感器芯片及配套应用产品的设计、开发、生产、测试和销售,月生产能力约为500万颗芯片。据悉。

Preparation of Ni nanoparticles plating by electrodeposition using reverse microemulsion as template

Ni nanoparticles plating was prepared in reverse microemulsion. The deposition was carried out through the Brownian motion of water pools in the reverse microemulsion and the adsorption of water pools on the electrode surface. Effects of electrolytic parameters on the size of Ni particles were studied. The performances of hydrogen evolution and hydrogen storage of the Ni nanoparticles plating electrode were also investigated. The results indicate that the size of Ni nanoparticles decreases with the increase of Ni2+ concentration and the decrease of current density. The electrochemical activity of Ni nanoparticles plating electrode is much higher than that of bulk Ni electrode.

Estimation of coal particle size distribution by image segmentation

Several industrial coal processes are largely determined by the distribution of particle sizes in their feed.Currently these parameters are measured by manual sampling,which is time consuming and cannot provide real time feedback for automatic control purposes.In this paper,an approach using image segmentation on images of overlapped coal particles is described.The estimation of the particle size distribution by number is also described.The particle overlap problem was solved using image enhancement algorithms that converted those image parts representing material in lower layers to black.Exponential high-pass filter(EHPF) algorithms were used to remove the texture from particles on the surface.Finally,the edges of the surface particles were identified by morphological edge detection.These algorithms are described in detail as is the method of extracting the coal particle size.Tests indicate that using more coal images gives a higher accuracy estimate.The positive absolute error of 50 random tests was consistently less than 2.5% and the errors were reduced as the size of the fraction increased.

Expression and significance of nuclear factor κB p65 in colon tissues of rats with TNBS-induced colitis

AIM: To investigate the role of NF-κB in the pathogenesis of TNBS-induced colitis in rats. METHODS: Thirty-two healthy adult Sprague-Dawley (SD) rats were randomly divided into four groups of eight each: normal, NS, model Ⅰ, model Ⅱ groups in our study. Rat colitis model was established through 2-,4-,6-trinitrobenzene sulfonic acid (TNBS) enema. At the end of four weeks, the macroscopical and histological changes of the colon were examined and mucosa myeloperoxidase (MPO) activities assayed. NF-κB p65 expression was determined by Western blot assessment in cytoplasmic and nuclear extracts of colon tissue, and the expressions of TNF-α and ICAM-1 protein in colon tissue were examined by immunohistochemistry. The relativities between expression of NF-κB p65 and other parameters were analyzed. RESULTS: TNBS enema resulted in pronounced pathological changes of colonic mucosa in model Ⅱ group (macroscopic and histological injury indices 6.25±1.39 and 6.24±1.04, respectively), which were in accordance with the significantly elevated MPO activity (1.69±0.11). And the nuclear level of NF-κB and expression of TNF-α, ICAM-1 in rats of model II group were higher than that of normal control (9.7±1.96 vs1.7±0.15, 84.09±14.52 vs 16.03±6.21, 77.69±8.09 vs 13.41±4.91 P<0.01), Linear correlation analysis revealed that there were strong correlations between the nuclear level of NF-κB and the tissue positive expression of TNF-α and ICAM-1, MPO activities, macroscopical and histological indices in TNBS-induced colitis, respectively (r= 0.8235, 0.8780, 0.8572, 0.9152, 0.8247; P<0.05). CONCLUSION: NF-κB plays a pivotal role in the pathogenesis of ulcerative colitis, which might account for the up-regulation the expression of TNF-α and ICAM-1.

Salvianolate inhibits cytokine gene expression in small intestine of cirrhotic rats

AIM:To study the effect of salvianolate on expression of tumor necrosis factor (TNF)-α and interleukin (IL)-6 mRNA in small intestine of cirrhotic rats. METHODS:Cirrhosis in rats was induced using CCl4 (0.3 mL/kg). Rats were randomly divided into non-treatment group,low-dose salvianolate (12 mg/kg) treatment group,medium-dose salvianolate (24 mg/kg) treatment group,and high-dose salvianolate (48 mg/kg) treatment group,and treated for 2 wk. Another 10 healthy rats served as a normal control group. Mortality of cirrhotic rats in each group was evaluated after treatment with salvianolate. Serum samples were taken from portal vein for the detection of endotoxin. Morphological changes in tissue samples from the ileocecum were observed under a light microscope. Expression of TNF-α and IL-6 mRNA in the small intestine of rats was analyzed by real-time reverse-transcriptase polymerase chain reaction. RESULTS:The mortality of cirrhotic rats in the nontreatment group was 37.5%. No cirrhotic rat died in the high-dose salvianolate treatment group. The serum endotoxin level was significantly higher in the non-treatment group than in the salvianolate treatment and normal control groups. The intestinal mucosal and villous atrophy,necrosis and shedding of the intestinal mucosal epithelium,observed in the non-treatment group,were reversed in different salvianolate treatment groups. The TNF-α and IL-6 mRNA expression levels in small intestine were significantly lower in different salvianolate treatment groups than in the non-treatment group. CONCLUSION:Salvianolate can reduce the endotoxin level,ameliorate the injury of intestinal mucosa,and inhibit the expression of TNF-α and IL-6 mRNA in small intestine of cirrhotic rats.

Cancer stem cell markers CD133 and CD24 correlate with invasiveness and differentiation in colorectal adenocarcinoma

AIM:To verify that CD markers are available for detecting cancer stem cell populations and to evaluate their clinical significance in colon cancer.METHODS:Immunohistochemistry for CD133,CD24 and CD44 was performed on the tissue microarray of 523 colorectal adenocarcinomas.Medical records were reviewed and clinicopathological analysis was performed.RESULTS:In colorectal adenocarcinoma,128 of 523 cases(24.5%) were positive and 395 cases(75.5%) were negative for CD133 expression.Two hundred and sixty-four of 523 cases(50.5%) were positive and 259 cases(49.5%) were negative for CD24 expression.Five hundred and two of 523 cases(96%) were negative and 21 cases(4%) were positive for CD44 expression.Upon clinicopathological analysis,CD133 expression was present more in male patients(P = 0.002) and in advanced T stage cancer(P = 0.024).Correlation between CD24 expression and clinicopathological factors was seen in the degree of differentiation(P = 0.006).Correlation between CD44 expression and clinicopathological factors was seen in the tumor size(P = 0.001).Survival was not significantly related to CD133,CD24 and CD44 expression.CONCLUSION:CD markers were related to invasiveness and differentiation of colorectal adenocarcinoma.However,CD expression was not closely related to survival.

中药贴敷涌泉穴 防治疾病有良效

中药贴敷足心涌泉穴治疗一些疾病,疗效颇佳。现介绍几种常见疾病的贴敷法。一、神经衰弱:酸枣仁9克,柏子仁9克,高度粮食酒适量。将二味中药研成末,用酒调拌成泥状,分别涂于手表大小的两块纱布上。

Exploring the effect of acupuncture plus mild hypothermia on miRNA-204 and its target gene expressions in CIRI rat brain tissues based on MAPK signal pathway

Objective:To explore the protective mechanism of acupuncture plus mild hypothermia for cerebral ischemia-reperfusion injury(CIRI)by observing the effects of acupuncture plus mild hypothermia on miRNA-204 and its target gene expressions in CIRI rat brain tissues.Methods:Sixty Sprague-Dawley rats were divided into a blank control group,a sham operation group,a model group,an acupuncture group,a mild hypothermia group and an acup un cture plus mild hypothermia group accordi ng to the random nu mbertable method(n=10).Except for the blank c on trol group an dthe sham operati on group,rats in the other 4 groups received CIRI modeling.After the model was successfully established,rats in the blank control group were bred routinely for 72 h without any interventions;rats in the sham operation group and the model group were bred routinely for 72 h,and only received bin ding without other interve ntions after surgery;rats in the acup un cture group were bred routinely for 72 h,and received acupuncture at Dazhui(GV 14),Baihui(GV 20)and Shuigou(GV 26)after binding;rats in the mild hypothermia group were bred routinely for 72 h,and received mild hypothermia intervention for 72 h after binding;rats in the acupuncture plus mild hypothermia group were bred routinely for 72 h,followed by receiving acupuncture as in the acup uncture group and mild hypothermia therapy as in the mild hypothermia group after bin ding.The n eurological impairme nt score,cerebral infarcti on area ratio,the expressions of miRNA-204 and its target genes in eluding Map3k8,Ntrk2 and Ppp3rl in the ischemic hippocampus of each group were observed after 72 h of intervention.Results:Before intervention,compared with the bgnk control group and the sham operation group,the neurological impairment scores and the infarction area ratios of the modelled rats were statistically significa ntly increased(all P<Q.Ql)f indicating that the model was successful.After intervention,compared with the model group,the neurological impairment scores of the three in tervention groups were sign ifica ntly reduced(all P<0.01);compared with the acupuncture group and the mild hypothermia group,the infarction area ratio in the acupuncture plus mild hypothermia group was signtiicantly reduced(both P<0.01);compared with the model group,the three intervention groups showed significant inhibition of miRNA-204 expression in brain tissues(all P<0.05),which was most significant in the acupuncture plus mild hypothermia group(P<0.01);compared with the acupuncture group and the mild hypothermia group,the Map3k8 expression in the acupuncture plus mild hypothermia group was significantly increased(both P<0.01),but there were no sign ificant d iff ere nces in Ntrk2 and Ppp3rl expressions between groups(all P>0.05).Conclusion:Acupuncture,mild hypothermia,and acupuncture plus mild hypothermia reduced the neurological impairment score and the cerebral infarction area in CIRI rats,while acupuncture plus mild hypothermia showed the most significant effect.In regulating miRNA-204 target gene expressions,acupuncture plus mild hypothermia showed the same effect on Ntrk2 and Ppp3rl expressions,while better effect on Map3k8 expression compared with either acupuncture or hypothermia.

Seiberg-Witten/Whitham Equations and Instanton Corrections in N = 2 Supersymmetric Yang-Mills Theory

We obtain the instanton correction recursion relations for the low energy effective prepotential in pure Ν = 2SU(n) supersymmetric Yang-Mills gauge theory from Whitham hierarchy and Seiberg-Witten/Whitham equations. These formulae provide us a powerful tool to calculate arbitrary order instanton corrections coefficients from the perturbative contributions of the effective prepotential in Seiberg-Witten gauge theory. We apply this idea to evaluate one-and two-order instanton corrections coefficients explicitly in SU(n) case in detail through the dynamical scale parameter expressed in terms of Riemann's theta-function.