mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Influences of Y_2O_3 dopant content on residual stress,structure, and optical properties of ZrO_2 thin films

Four kinds of Y_2O_3 stabilized ZrO_2 (YSZ) thin films with different Y_2O_3 contents (from 0 to 12 mol%) are deposited on BK7 glass substrates by electron-beam evaporation method. The effects of different Y_2O_3 dopant contents on residual stress, structure, and optical properties of ZrO_2 thin films are investigated. The results show that residual stress in YSZ thin films varies from tensile to compressive with the increase of Y_2O_3 molar content. The addition of Y_2O_3 is beneficial to the crystallization of YSZ thin film and transformation from amorphous to high temperature phase, and the refractive index decreases with the increase of Y_2O_3 molar content. Moreover, the variations of residual stress and the shifts of refractive index correspond to the evolution of structures induced by the addition of Y_2O_3.
Ultraviolet Raman lidar for high-accuracy profiling of aerosol extinction coefficient

An ultraviolet (UV) Raman lidar system at 354.7 nm has been developed for accurately measuring the aerosol extinction profiles. A spectroscopic filter combining a high-spectral-resolution grating with two narrowband mirrors is used to separate the vibrational Raman scattering signal of N_2 at a central wave-length of 386.7 nm and the elastic scattering signal at 354.7 nm. The aerosol extinction is derived from the Raman scattering of N_2 and the elastic scattering by the use of Raman method and Klett method, respectively. The derived results of aerosol extinction are used to compare the difference of two retrieval methods, and the preliminary experiment shows that the Raman lidar system operated in analog detection mode has the capability of measuring aerosol profiles up to a height of 3 km with a laser energy of 250 mJ and an integration time of 8 min.
法医学本科生教育模式改革探讨

我国的法医学本科教育从上世纪80年代开始起步,经过20余年的发展,目前已形成了以本科教育为核心的多层次人才培养模式.我国现行法医本科生培养模式为五年制,其中一、二、三年级学习基础医学课程,包括解剖学、病理学等,四年级学习内、外、妇、儿等医学临床课程,并要进行3个月的临床实习;五年级开始法医学专业课程的学习及实习,包括法医病理学、法医毒理学、法医毒物分析、法医物证学、法医临床学等,实习时间一般4～6个月.
山西汉族人群3个Y-STR基因座遗传多态性

Y-STR在群体遗传学、法医学混合斑的个体识别以及父权的单亲鉴定方面有着重要的应用价值[1-4].但由于Y染色体遗传标记的多态性远较常染色体基因座低,而且Y-STR基因座在不同人群的差异性远高于常染色体基因座,因此需要寻求更多基因座来满足需要.
Cassini Growth of Population Between Two Metropolitan Cities——A Case Study of Beijing-Tianjin Region, China

The existing models of population distribution often focus on the region with a single city or even multiple centers, and lack the detailed explorations of the common and special type of urbanization areas with two centers. Taking Beijing-Tianjin region of China, which is a distinct dual-nuclei metropolitan area in the world, as an example and choosing Landsat-5 TM image in 2005, population, etc.as the data, this paper devotes to comprehending and illustrating a model of Cassini growth of population between the two metropolitan cities through the research of spatial population distribution pattern, aided with RS and GIS techniques. Main technical processes include Kriging interpolation of the population data and character simulation of the Cassini ovals. According to the calculation of a/b, a key characteristic index of Cassini growth model, the spatial structures of population distribution were given. When a/b<1,it is a curve with two separated loops with a population density more than 3000 persons/km~2. When a/b=1, it is a lemniscate curve with a population density about 3000 persons/km~2. When 1
Application of Matter-element Model in Soil Nutrient Evaluation of Ecological Fragile Region

On the basis of the soil environment investigation in Da'an City, Jilin Province, China, 40 soil samples from main land use types were obtained and tested by standard method. Soil organic matter (SOM), total N (TN), total P (TP), total K (TK), available N (AN), available P (AP) and available K (AK) were chosen as the evaluation factors. A regional soil nutrient evaluation model was developed based on the matter-element model. The results show that the soil samples with nutrient grade Ⅱ-Ⅴ respectively account for 10%, 30%, 32.5% and 27.5%, and those with grade Ⅳ and Ⅴ account for 60% in all samples. The relationship between soil nutrients and land types indicates that the nutrients of farmland are relatively good, with 41.7% of soil samples with the nutrient grade Ⅳ and Ⅴ. The nutrients of saline-alkali land and sandy land are the worst, with 100% of soil samples with the nutrient grade Ⅳ and Ⅴ. And the ratios of soil samples grade Ⅳ and Ⅴ in grassland and wasteland are respectively 62.5 % and 54.55%. Generally speaking, the soil nutrients status in Da'an City is poor, 60% of soil samples are in poor and extremely poor conditions, indicating that the soil has been severely eroded. Being a relatively superior evaluation method with more accurate results and spatial distribution consistency, matter-element analysis is more suitable for regional soil nutrient evaluation than previous models.
Multiple Time Scale Analysis of River Runoff Using Wavelet Transform for Dagujia River Basin, Yantai, China

Based on monody river runoff and meteorological data, a method of Morlet wavelet transform was used to analyze the multiple time scale characteristics of river runoff in the Dagujia River Basin, Yantai City, Shandong Province. The results showed that the total annual river runoff in the Dagujia River Basin decreased significantly from 1966 to 2004, and the rate of decrease was 48×10~6m~3/10yr, which was higher than the mean value of most rivers in China. Multiple time scale characteristics existed, which accounted for different aspects of the changes in annual river runoff, and the major periods of the runoff time series were identified as about 28 years, 14 years and 4 years with decreasing levels of fluctuation. The river runoff evolution process was controlled by changes in precipitation to a certain extent, but it was also greatly influenced by human activities. Also, for different time periods and scales, the impacts of climate changes and human activities on annual river runoff evolution occurred at the same time. Changes in the annual river runoff were mainly associated with climate change before the 1980s and with human activities after 1981.
Remote Sensing Monitoring of Tobacco Field Based on Phenological Characteristics and Time Series Image——A Case Study of Chengjiang County, Yunnan Province, China

Using three-phase remote sensing images of China-Brazil Earth Resources Satellite 02B (CBERS02B) and Landsat-5 TM, tobacco field was extracted by the analysis of time series image based on the different phenological characteristics between tobacco and other crops. The spectral characteristics of tobacco and corn in luxuriant growth stage are very similar, which makes them difficult to be distinguished using a single-phase remote sensing image. Field film after tobacco seedlings transplanting can be used as significant sign to identify tobacco. Remote sensing interpretation map based on the fusion image of TM and CBERS02B's High-Resolution (HR) camera image was used as standard reference material to evaluate the classification accuracy of Spectral Angle Mapper (SAM) and Maximum Likelihood Classifier (MLC) for time series image based on full samples test method. SAM has higher classification accuracy and stability than MLC in dealing with time series image. The accuracy and Kappa of tobacco coverage extracted by SAM are 83.4% and 0.692 respectively, which can achieve the accuracy required by tobacco coverage measurement in a large area.
An Improved Method for Modeling Spatial Distribution of δD in Surface Snow over Antarctic Ice Sheet

Using the recent compilation of the isotopic composition data of surface snow of Antarctic ice sheet, we proposed an improved interpolation method of δD, which utilizes geographical factors (i.e., latitude and altitude) as the primary predictors and incorporates inverse distance weighting (IDW) technique. The method was applied to a high-resolution digital elevation model (DEM) to produce a grid map of multi-year mean δD values with 1km spatial resolution for Antarctica. The mean absolute deviation between observed and estimated data in the map is about 5.4‰, and the standard deviation is 9‰. The resulting δD pattern resembles well known characteristics such as the depletion of the heavy isotopes with increasing latitude and distance from coast line, but also reveals the complex topographic effects.
Philos-type Oscillation Theorems for Second Order Damped Elliptic Equations

Using general means, we establish several new Philos-type oscillation theorems for the second orderdamped elliptic differential equation∑Di[aij(x)Djy] + ∑ bi(x)Diy + c(x)f(y) = under quite general assumptions. The obtained results are extensions of the well-known oscillation results due to Kamenev, Philos, Yah for second order linear ordinary differential equations and improve recent results of Xu, Jia and Ma.
Efficient Estimation for Semiparametric Varying Coefficient Partially Linear Regression Models with Current Status Data

This article considers a semiparametric varying-coefficient partially linear regression model with current status data. The semiparametric varying-coefficient partially linear regression model which is a gen-eralization of the partially linear regression model and varying-coefficient regression model that allows one to explore the possibly nonlinear effect of a certain covariate on the response variable. A Sieve maximum likelihood estimation method is proposed and the asymptotic properties of the proposed estimators are discussed. Under some mild conditions, the estimators are shown to be strongly consistent. The convergence rate of the estima-tor for the unknown smooth function is obtained and the estimator for the unknown parameter is shown to be asymptotically efficient and normally distributed. Simulation studies are conducted to examine the small-sample properties of the proposed estimates and a real dataset is used to illustrate our approach.
FEC序贯多西紫杉醇用于腋窝淋巴结阳性乳腺癌辅助治疗

1 文献来源Roché H,Fumoleau P,Spielmann M,et al.Sequential adjuvant Epirubicin-based and Docetaxel chemotherapy for node-positive breast cancer patients:The FNCLCC PACS 01 Trial[J].J Clin Oncol,2006,24(36):5664-5671.
磁场定向控制感应电动机的弱磁控制

0引言在感应电动机的无传感器磁场定向控制中,有些应用需要具备高速运行能力,但只需在低速时输出高转矩,如洗衣机和电力机车中的牵引等.本文介绍的弱磁控制技术可以满足此要求.
Relativistic reflection X-ray spectra of accretion disks

We have calculated the relativistic reflection component of the X-ray spectra of accretion disks in active galactic nuclei (AGN). Our calculations have shown that the spectra can be significantly modified by the motion of the accretion flow, and the gravity and rotation of the central black hole. The absorption edges in the spectra suffer severe energy shifts and smearing, and the degree of distortion depends on the system parameters, in particular, the inner radius of the accretion disk and the disk viewing inclination angles. The effects are significant. Fluorescent X-ray emission lines from the inner accretion disk could be a powerful diagnostic of space-time distortion and dynamical relativistic effects near the event horizons of accreting black holes. However, improper treatment of the reflection component in fitting the X-ray continuum could give rise to spurious line-like features. These features mimic the true fluorescent emission lines and may mask their relativistic signatures. Fully relativistic models for reflection continua together with the emission lines are needed in order to extract black-hole parameters from the AGN X-ray spectra.
A comparison between magnetic shear and flare shear in a well-observed M-class flare

We give an extensive multi-wavelength analysis of an eruptive M1.0/1N class solar flare, which occurred in the active region NOAA 10044 on 2002 July 26. Our empha-sis is on the relationship between magnetic shear and flare shear. Flare shear is defined as the angle formed between the line connecting the centroids of the two ribbons of the flare and the line perpendicular to the magnetic neutral line. The magnetic shear is computed from vector magnetograms observed at Big Bear Solar Observatory (BBSO), while the flare shear is computed from Transition Region and Coronal Explorer (TRACE) 1700A images. By a detailed comparison, we find that: 1) The magnetic shear and the flare shear of this event are basically consistent, as judged from the directions of the transverse mag-netic field and the line connecting the two ribbons' centroids. 2) During the period of the enhancement of magnetic shear, flare shear had a fast increase followed by a fluctuated decrease. 3) When the magnetic shear stopped its enhancement, the fluctuated decreasing behavior of the flare shear became very smooth. 4) Hard X-ray (HXR) spikes are well correlated with the unshearing peaks on the time profile of the rate of change of the flare shear. We give a discussion of the above phenomena.
妊娠合并胰腺炎的围生结局

妊娠合并胰腺疾病很少见,其中较多见的一种是妊娠合并胰腺炎,本文重点叙述妊娠合并胰腺炎的围生期结局.妊娠合并胰腺炎分为急性和慢性两种,无论何种类型的胰腺炎,对围生结局的危害都很大.
输卵管绝育术后异位妊娠36例分析

输卵管绝育术是一种安全、可靠的永久性控制生育的方法,为全世界主要节育措施之一.输卵管绝育术虽成功率很高,但仍有一定的失败率.国内综合资料报道失败率为0.16%～2.4%~[1].
女性生殖系统双原发癌2例

1 病例报告例1患者,51岁,因不规则阴道流血2年,加重1周,于2005年5月16日上午9时急诊入某医院.患者于2年前出现不规则阴道流血,表现为月经周期延长(2月余),经期持续1+月,经量多(用卫生巾50张),无腹痛、发热、头昏、心悸、腹泻、便秘、血尿等,无阴道排液及性交后阴道流血.
辅助生殖技术后的异位妊娠

辅助生殖技术(assisted reproduction technologies,ART)给许多不孕家庭带来了福音,但随之异位妊娠(ectopic pregnancy,EP)发生率也增加.1975年,首例体外受精-胚胎移植(in vitro fertilization and embryo trans-fer,IVF-ET)获得的妊娠即为异位妊娠.ART周期EP发生率为1%～5%,较自然周期高2倍以上,有报道,IVF-ET周期EP发生率达2%～11%.有学者将EP危险因素归纳为机械因素、输卵管功能异常、ART及激素因素.
焉耆盆地生态需水量研究

焉耆盆地位于我国西北干旱区内陆腹地,为典型的大陆性干旱气候,降水稀少,蒸发强烈.区内水土资源丰富,是巴音郭楞蒙古自治州农牧业的主要基地.随着人口的增加和社会经济的发展,该地区水资源利用和生态环境之间的矛盾越来越突出.论文利用干旱区植被生态需水量计算方法,计算出该地区的农业需水量约为10.11亿m~3,园、林地需水量约为2.43亿m~3,牧草地及荒草地需水量约为30.00亿m~3,博斯腾湖大小湖区的总蒸发及生态需水量约为13.86亿m~3.该地区生态需水量共计约为56.40亿m~3.通过计算焉耆盆地的生态需水量可为合理分配该区域的水资源提供参考;为生态保护以及水资源可持续利用提供科学依据.
孕酮与疼痛调节

孕酮(progesterone,PROG)不仅存在于生殖系统,而且在神经系统也有合成.孕酮受体在中枢和外周神经系统中均有分布,参与神经系统的各项功能,其中包括对疼痛的调节.孕酮及其代谢产物对生理性痛和炎性痛均有抑制效应,孕酮对雌激素介导的外周痛觉增敏也有抑制效应.另一方面,孕酮增强神经病理性痛的痛觉异常和痛觉过敏.孕酮可以通过调节某些痛觉相关的神经递质受体的表达和功能以及影响疼痛下行抑制通路,从而完成对痛觉调节.
"中国经济形势分析与预测2009年春季座谈会"综述

2009年4月20日,中国社会科学院经济学部"经济形势分析与预测"课题组召开了"2009年经济形势分析与预测春季座谈会".汪同三学部委员代表课题组发布了预测报告.来自国务院各部委、有关科研机构、高校及部分省市的数十位专家学者出席了座谈会,香港特别行政区的专家也出席了会议并作了发言.各主要媒体到会进行了采访、报道.
全国温度偏高南方降水偏多——2009年3月——

3月份全国冷暖起伏大,上中旬少冷空气活动,下旬冷空气活动频繁,但月内全国平均气温较常年同期偏高1.3℃.全国平均降水量为29.1mm,较常年同期略偏多.降水主要集中在江南、华南等地.其中,海南3月区域平均降水量为1951年以来历史同期最大值.月内,北方地区出现3次沙尘天气过程.
肺癌皮肤转移1例

@@ 患者男,65岁.因右侧胸部、背部皮下结节伴全身多处疼痛半年,于2008年4月29日来我科就诊.患者半年前不明原因全身多处疼痛,右侧胸壁出现绿豆大皮下结节,无明显自觉症状.半年来右胸壁皮下结节逐渐增大,并于1个月前右侧上背部出现3个粟粒大皮下结节.患者自发病以来,无胸闷、乏力、咳嗽、体重减轻,无吸烟史.
5-氨基酮戊酸光动力疗法

随着光动力医学的不断进展和5-氨基酮戊酸-光动力疗法(ALA-PDT)在皮肤科领域的普及应用,较全面地了解ALA-PDT作用机制、治疗特点、适应证及相关事项十分必要.
城镇污水处理厂防洪标准和设计地面标高及排水方式的合理确定

通过具体分析规范、标准中与污水处理厂设计相关的防洪条文,指出了其不明确的地方,总结了影响城镇污水处理厂防洪标准、设计地面标高及排水方式的多种因素.以河北省徐水县一期污水处理工程(3万m~3/d)为例,介绍了在没有污水处理厂具体防洪规范及标准情况下如何科学、合理地确定污水处理厂的防洪标准、设计地面标高及排水方式.污水处理厂防洪标准不应是简单的、同一的,而应结合当地实际情况,通过风险-投资-效益来综合评价科学合理地确定污水处理厂的防洪标准、设计地面标高和排水方式等.
赤豆螺在生物接触氧化工艺中的危害及其去除研究

赤豆螺在生物接触氧化池中,会大量生长繁殖,啃食生物膜,影响净水效果.针对赤豆螺的生长因子和栖息条件,研究其生长和抑制规律,并探讨除螺措施.试验结果表明:单个成体螺一周内可啃食一根纤维丝;固定式填料和悬浮填料均不能避免挂螺;采用先排空晾干再水力冲洗,能明显清除螺,且简单可行;预加氯和次氯酸钠浸泡杀螺效果不佳;预设气浮工艺可完全杜绝成体螺和螺卵进入生化池,安全可靠.
热水循环泵节能探讨

全日制机械循环生活热水集中供应系统存在着非常大的无效循环流量,浪费能耗.循环泵配置容量过大和运行时间过长是产生无效循环流量的重要原因.环状配水管网替代传统的枝状配水管网可均衡管网中的水温,减少对循环泵的运行需求.把控制循环泵运行的感温器设置在环状配水管网中,可减少循环泵的无效运行时间.
铅蓄电池硫酸盐化的探讨

在动力电池中，铅蓄电池有技术成熟，价格便宜，充放电性能良好，使用安全等优点^[1]。然而，极板硫酸盐化使铅蓄电池实际寿命远不能达到理论使用寿命，不仅浪费资源，而且产生大量的固体废弃物、废酸等，对环境造成严重的污染。为了解决硫酸盐化问题，人们利用各种手段对其形成机理进行研究，研制出大量的电池添加剂、修复设备及各种改进的电池极板材料等。本文基于国内外的研究成果，分析了铅蓄电池硫酸盐化的形成原因、机理、缓解或解决这一问题的方法。[第一段]
麻纤维表面化学镀镍

麻纤维是一种廉价的材料，由于其自身的特性目前主要应用于纺织行业，但表面粗糙、耐磨性能差和非导电性限制了在其他领域的应用。如果能在其表面镀上一层金属或合金，改善其表面的结构特性，使其具有良好的柔软、耐磨、耐腐蚀、导电等优良性能，其应用范围更加广泛。本文对麻纤维表面化学镀镍进行了一些有益的探讨，取得了较好的实验结果，对进一步拓宽化学镀的研究领域和麻纤维的应用范围，具有一定的实用性。[第一段]
分类收集效益模型在农村生活垃圾处理处置中的应用

分析了农村生活垃圾处理效益的组成,据此建立了农村生活垃圾分类收集效益模型.以南通市农村为研究对象,确定了该模型中的各参数,并且利用该模型计算了方案1(回收/填埋)、方案2(回收/焚烧/填埋)和方案3(回收/焚烧/堆肥/填埋)的分类收集效益.结果表明,方案3及其分类收集方式具有良好的经济效益和环境效益.
北京市生活垃圾分类处理体系:Ⅰ.问题诊断

通过建立评价指标体系的方法对北京市生活垃圾分类处理体系中存在的问题进行诊断.首先,简要分析了北京市生活垃圾处理现状,在此基础上提出了北京市生活垃圾分类处理评价指标体系,进而运用层次分析法确定各评价指标的权重.并通过计算这些评价指标的权重与其未达标率之积,得出北京市垃圾分类处理体系中存在问题的严重程度排序为垃圾分类运输车配置率＞垃圾回收率＞垃圾分类收集率＞居民垃圾分类参与率＞垃圾处理设施运转率＞垃圾填埋、堆肥、焚烧所占比例＞居民垃圾分类知晓率＞垃圾分类收集容器配置率＞回收站设置的便利度＞垃圾运输能力＞垃圾无害化处理率.
公路两侧土壤中铅和镉污染以及存在形态分布的分析

测定了土壤中铅、镉总量,并采用五级连续浸提法和石墨炉原子吸收分光光度法对北京市3条典型公路两侧的土壤样品中铅和镉的存在形态分布进行了测定.结果表明,所选3条公路出京方向右侧的土壤铅和镉污染严重,其铅、镉总量分别是北京地区土壤铅和镉含量背景值的1.62～6.69、5.97～18.74倍.土壤中铅主要以铁锰氧化物结合态、碳酸盐结合态、有机结合态和残渣态等形式存在,镉主要以铁锰氧化物结合态和残渣态形式存在,而活性强的离子交换态浓度均较低.不容忽视的是,铅和镉的碳酸盐结合态在碱性条件下稳定,但是具有遇酸释放的隐患.
原发性气管腺样囊性癌1例报告

@@ 患者男,50岁,因反复咳嗽、气喘4年,再发4d,加剧1h于2007年7月19日入院.患者缘于4年前开始反复出现咳嗽、咳痰,活动后气喘,多次就诊于当地医院,多次行胸部X线检查均未见明显异常,诊断为"支气管哮喘",间断使用"喘康速气雾剂"等,症状无缓解反而逐渐加重,夜间经常喘息发作,坐起前倾体位可缓解.4d前上述症状加重,在当地诊所治疗(具体不详)症状无明显好转,1h前出现神志不清,呼之不应,张口呼吸,喉中痰鸣,伴口唇紫绀,面色苍白,急送我院急诊,予"氨茶碱、地塞米松"静推后,急诊拟以"支气管哮喘急性发作"收住我科.
基于S7-300物流控制系统设计

课题以典型的实验室现场物流传输系统为研究对象,首先研究了现场货物管理各环节所要实现的功能,其中包括立体仓库的货物存储,现场搬运、传输、条码识别、颜色分拣、称重等.在此基础上,从控制物体传输的准确定位目标出发,通过方案比较,提出了网络控制的系统模式,整个物流传输分为若干环节,每一相对独立的环节采用S7-200控制,环节之间以时序逻辑控制的方式有机结合,信号传递与参数的调用由S7-300完成.整个现场操作由S7-300充当主站,S7-200充当从站,组成Profibus网络.此外,为便于上位机监控,对PC机及充当系统过程机的S7-300进行组网,建立MPI监控网络.接着,在Simatic Manager环境下编写通信程序及主程序,并且进行进一步调试,确保现场货物可靠传输.最后,在下层设备可靠操作的基础上,建立监控画面,编写监控程序,整个系统集数据库监控操作与现场的货物传输为一体,实现了货物的出入库任务管理.
数控机床低速爬行分析及对策研究

数控机床低速爬行对零件的精度和表面光洁度有重要影响.文章分析了数控机床低速运动下发生的爬行现象及产生爬行的机理,论述了改善机床平稳性的途径,介绍了消除爬行现象的方法,最后对排除数控机床爬行的具体方法与步骤作了进一步详细分析.
基于高精度GPS时钟的新型故障录波装置

文章介绍了一种新型线路故障录波装置.针对现有故障录波设备的不足之处,设计了高精度GPS时钟,为电网的全局分析提供了基础;并采用行波测距,提高了测距精度;最后利用小波变换技术进行数据压缩,保证了录波数据的及时快速上传.现场运行情况表明,所设计的故障录波系统能可靠地记录故障数据,并能准确地进行测距.
基于UG的加工仿真及后置处理器的开发

目前多数的数控仿真软件仿真的机床和控制系统有限,不能满足一般企业的需求,而且仿真的代码也需要手工输人到仿真系统中,不能保证仿真的准确率.文章在UG/POST通用后置处理器的基础上,开发出针对NEXUS_410B机床的四轴专用后置处理器,能够自动输出数控程序,并详细阐述了在UG/IS&V环境下数控机床仿真模型的构建与加工仿真系统的建立过程,包括刀具轨迹的创建与验证、数字模型与装配、运动仿真、机床驱动器以及仿真模型的加工仿真,并通过产品加工实例验证了该专用后置处理器和加工过程仿真系统的正确性和实用性.
行业标准《铸造用自硬味喃树脂》解读

近年来,呋喃树脂在技术上取得了较大的发展,根据呋喃树脂行业发展的现状,对1994年版<铸造用自硬呋喃树脂>行业标准作了必要的修订.为了使各单位尽快孰悉应用这项标准,笔者撰写了这份解读,从标准的修订背景、标准概述和主要内容及与旧标准的主要差异三方面对新标准进行了较为详细的阐述,对标准的实用性、先进性和指导性进行了总结,同时对标准的贯彻执行提出了要求.
球毛壳ND35在杨树的定植及对酶活性的影响

球毛壳Chaetomium globosum ND35菌株是一株分离自健康毛白杨的内生菌菌株,能对多种植物病原真菌产生明显的拮抗作用~[1],但其侵染的方式及侵染后对植物的影响未见报道.
海洋硅藻三角褐指藻生长及光合作用对阳光UV辐射的响应

以海洋硅藻三角褐指藻为研究对象,将其置于全波段阳光辐射(PAB,280-700 nm)、阳光辐射滤除UV-B(PA,320-700 nm)以及光合有效辐射PAR(P,400-700 nm)3种辐射处理下进行培养,以探讨阳光UVR对其生长及光合作用的影响.研究发现,在低PAR条件下(日辐射剂量小于1.34 MJ/m~2时),UVR的存在对三角褐指藻的生长表现促进作用;而随着辐射剂量的增加,UVR对生长的抑制效应突显.在73.6 W/m~2 UV-A及2.24 W/m~2UV-B辐射水平下,三角褐指藻PSⅡ的有效光化学效率下降为P处理下的24%,碳酸酐酶活性被完全抑制,其光合固碳速率被抑制84%,表明高辐射水平下UVR显著抑制三角褐指藻的光合作用,从而导致生长速率降低.
基于全球通量观测站的全球土地覆盖图精度检验

全球土地覆盖数据产品是理解人类活动与全球变化之间复杂相互作用的关键信息来源.它们在提高生态系统,水文和大气模式的性能方面起着至关重要的作用.美国和欧洲已经花费数千万美元,收集数据,研制算法,编制了全球土地覆盖数据库.目前,在全球变化科学领域普遍使用着三套由美国开发并免费提供的全球土地覆盖产品.其中两个分别由美国地质调查局和马里兰大学分别利用1992-1993年的NOAA甚高分辨率辐射计(AVHRR)数据制作,另一个由波士顿大学利用2000-2001年的EOS中级分辨率成像光谱仪(MODIS)数据制作.与世界各地250个通量观测站已知的土地覆盖类型相比,可以评估这三种全球土地覆盖图的精度状况.我们得到的结果表明美国地质调查局的精度为37%,美国马里兰大学的精度为36%而美国波士顿大学的精度为42%.这些土地覆盖图的精度随区域的不同而变化.例如,用美国和加拿大102个通量观测站的土地覆盖类型验证的结果表明在相应地区的制图精度接近50%,然而,用中国14个通量站土地覆盖类型的验证精度却低于10%.这种精度远远不能满足全球变化科学发展的需要.必须继续开展全球土地覆盖分类制图的关键技术研究,不断提高全球土地覆盖图的精度.文中提出未来全球土地覆盖制图的一些战略性建议.
儿童原发性激素依赖型肾病的临床病理分析

儿童原发性激素依赖型肾病(SDNS)是指患儿对激素治疗敏感,用药后缓解,但激素减量或停药后1个月内复发,恢复用药或再次用药仍然有效,并重复2次以上的原发性肾病.目前SDNS的发病率较高,为提高对SDNS的认识,本研究回顾性分析我院85例原发性SDNS患儿的临床与病理特点.
胎儿环状胰腺致十二指肠狭窄超声表现1例

孕妇,26岁.孕1产0,孕28~(+6)周.1周前外院超声诊断胎儿十二指肠闭锁.超声检查胎儿双顶径7.3 cm,头围26.6 cm,腹围25.3 cm,股骨长5.6 cm,均符合孕周,羊水指数16.8 cm,十二指肠球状扩张,胃泡明显扩张,扩张的胃泡与十二指肠之间有一长条形囊状结构相连(图1),腹部可见充盈肠管(图2).超声诊断:①宫内孕单胎妊娠;②胎儿十二指肠狭窄(可能为环状胰腺所致).于孕33周、孕37周复查超声,胎儿各项生理指标均与孕周相符,羊水指数分别为17.0 cm,15.2 cm.胎儿腹部均可见扩张的胃泡及十二指肠.于孕38+3周顺产一女婴,体质量3100 g,生后3 d经手术证实为环状胰腺所致十二指肠降部中段重度狭窄.
苍术属药用植物水溶性化学成分及其药理活性的研究进展

药用植物包括苍术,关苍术等,其水溶性化学成分包括糖苷,糖类,氨基酸等;药理活性包括肠道免疫作用,降血糖,降血压,免疫调节,抗衰老等.对其水溶性化学成分和药理活性进行综述,为进一步开发利用提供依据.
Flexible three-band motion-compensated temporal filtering for scalable video coding

A novel scheme for scalable video coding using three-band lifting-based motion-compensated transform is presented in this article. A series of flexible three-band motion-compensated lifting steps are used to implement the temporal wavelet transform, which provide improved compression performance by selecting specific motion model according to real video sequences, and offer higher temporal scalability flexibility by using three-band lifting steps. The experimental results compared with motion picture expert group (MPEG)-4 codec concerning standard video sequences demonstrate the effectiveness of the method.
Topology-aware peer-to-peer overlay network for Ad-hoc

The mismatch between the structured peer-to-peer (P2P) overlay network, which is based on Hashing, and the actual physical network, leads to query repeatedly passing through some nodes in the actual route when it is applied in Ad-hoc networks. An approach of getting an appropriate node identifier (ID) bearing its local physical information is proposed, in which the traditional theory of getting node ID through Hashing the node's Internet protocol (IP) address is abandoned, and a topology-aware overlay network suiting Ad-hoc networks is constructed. The simulation results show that the overlay network constructed in the proposed method can avoid the route being iteratively accessed. Meanwhile, it can effectively minimize the latency and improve the load balance.
MiniTE: data acquisition routing for wireless sensor networks

Routing is one of the most important supporting parts in wireless sensor networks (WSNs) application that directly affects the application efficiency. Routing time and energy consumption are two major factors used to evaluate WSNs routing. This article proposes a minimum routing time and energy consumption (MiniTE) routing, which can ensure feasibility of the routing protocol both in routing time and energy consumption. Based on the MiniTE, WSNs can be partitioned into different regions according to the received signal strength indication (RSSI). Messages are sent by nodes in the region to their parent node and again up to their parent node until finally to the sink node. Theoretic evaluation and simulation results are given to verify the features of the protocol.
Energy-efficient collaborative target tracking algorithm using cost-reference particle filtering in wireless acoustic sensor networks

Target tracking is one of the most important applications of wireless sensor networks. Optimized computation and energy dissipation are critical requirements to save the limited resource of sensor nodes. A new robust and energy-efficient collaborative target tracking framework is proposed in this article. After a target is detected, only one active cluster is responsible for the tracking task at each time step. The tracking algorithm is distributed by passing the sensing and computation operations from one cluster to another. An event-driven cluster reforming scheme is also proposed for balancing energy consumption among nodes. Observations from three cluster members are chosen and a new class of particle filter termed cost-reference particle filter (CRPF) is introduced to estimate the target motion at the cluster head. This CRPF method is quite robust for wireless sensor network tracking applications because it drops the strong assumptions of knowing the probability distributions of the system process and observation noises. In simulation experiments, the performance of the proposed collaborative target tracking algorithm is evaluated by the metrics of tracking precision and network energy consumption.
老年急性胰腺炎的护理

目的 对老年急性胰腺炎(acute pneumonia,AP)的护理进行总结和分析.方法 将该院2000-2006年收治的老年AP,从伴随疾病、临床特点、并发症情况进行回顾性总结.结果 老年AP具有反应性降低,病情变化快,合并症多.易转成重症,病死率高的特点.结论 充分了解和掌握其特点,进行正确及时的诊断和治疗,加强重要脏器功能监测,并发症的预防和护理,对老年AP的康复至关重要.
不分组资料百分位数计算方法的探讨

在常用的统计学教材中,对于中位数均有论述和计算公式.关于百分位数,虽都介绍其基本概念,但有的无计算方法[1],有的给出了分组资料的计算公式[2],有的给出不分组资料四分位数的计算公式[3],却都没有不分组资料百分位数的计算公式.
血清雌孕激素水平及其比值对体外受精-胚胎移植结局的影响

目的 探讨注射人绒毛膜促性腺激素(HCG)当天孕激素水平及雌孕激素比值对体外受精-胚胎移植(IVF-ET)妊娠率的影响.方法 2006年5月至2007年3月在贵阳市妇幼保健院生殖中心就诊279例不孕症患者300个周期进行IVF-ET治疗,在注射HCG当天测定雌二醇(E2)、孕酮(P).按注射HCG日所测血清P水平分为3组:第1组P≤2.86nmol/L 131周期;第2组2.86nmol/L＜P≤9.54nmol/L 92周期;第3组P＞9.54nmol/L 77周期.按P/E2比值分为2组:注射HCG日P/E2<1组219例.P/E2≥1组81例.结果 按P水平分组,第3组妊娠率(27.2%)明显低于其他2组(第1组52.6%,第2组45.6%),P＜0.05.P/E2＜1组妊娠率(49.8%)高于P/E2≥1组(28.4%),P＜0.05.结论 在IVF-ET治疗中注射HCG当天血清P水平及P/E2比值影响妊娠结局,是预测IVF-ET妊娠率的较好指标.
多房棘球绦虫Em18研究进展

泡型棘球蚴病(alveolar echinocoecosis,AE)是由多房棘球绦虫(Echinococcus multilocularis,Em)的续绦期幼虫寄生在人体肝脏引起的一种严重危害人类健康的人兽共患寄生虫病,是国家卫生部规划防治的五大寄生虫病之一.