mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Simulation of the continuous casting process in a mold of free-cutting steel 38MnVS based on a MiLE method

A new method called mixed Lagrangian and Eulerian (MiLE) method was used to simulate the continuous casting process in a mold of free-cutting steel 38MnVS.The simulation results are basically in agreement with experimental data in the literature,achieving the three-dimensional visualization of temperature distribution,melt flow,shell thickness,and stress distribution of blooms in a mold.It is shown that the flow velocity of steel melt becomes smaller gradually as the casting proceeds.When the flow reaches a certain depth,two types of flow patterns can be observed in the upper zone of the mold.The first flow pattern is to flow downwards,and the second one is to flow upwards to the meniscus.The corner temperature is higher,and the thickness is thinner than those in the mid-face.The effective stress in the corner area is much bigger than that in the mid-face,indicating that the corner area is the dangerous zone of cracking.
Identification and Purification of an Allergic Glycoprotein from Ginkgo biloba Kernel

Glycoprotein from Ginkgo biloba kernel may be allergic. In this paper, the allergic proteins were identified with Western blotting, and the 32 kDa glycoprotein was purified with ion exchange chromatography and gel chromatography. With Western blotting, there were 3 allergic proteins with molecular weight 21, 32, and 36 kDa. With SDS-PAGE analysis and measurements of the protein and sugar contents, the isolation and purification technology of 32 kDa was confirmed. Ginkgo crude protein extract was precipitated with ammonium sulphate (saturation gradient: 40-80%). The precipitate was purified by chromatography with DEAE-cellulose 52, then chromatography with Sephadex G-200 and the target glycoprotein was finally obtained. The analysis results showed the molecule of the glycoprotein was 32.12 kDa and the ratio of protein to sugar was 20.56:1. In conclusion, the purification method could be used in preparation of the glycoprotein, and the study could provide a basis for the further research of the glycoprotein.
Production of Embryogenic Callus and Plant Regeneration from Elite Guizhou Waxy Maize Inbred Lines

Immature embryos from three elite Guizhou waxy maize inbred lines (W21019, B7, and QCL5036) were evaluated for their ability of forming callus and regeneration into plants. Immature embryos harvested at different physiological stages were used as explants to initiate callus on N6 basal medium with 0-3.5 mg L~(-1) of 2,4-dichlorophenoxy acetic acid (2,4-D). The concentration of 2,4-D, physiological age of immature embryos and genotype had a significant effect (P<0.05) on the percentage of embryogenic callus formed. The optimum 2,4-D concentration for the initiation of embryogenic callus was varied among the waxy maize genotypes from 2.0 mg L~(-1) (B7 and QCL5036) to 3.0 mg L~(-1) (W21019). The shoots were generated from embryogenic callus which were transferred into the regeneration medium supplemented with 0-2.5 mg L~(-1) of 6-benzylaminopurine (6-BA). 6-BA in the medium significantly promoted the regeneration of embryogenic callus. Embryogenic size was also an important factor that affected regeneration capacity. 0.6-0.7 cm was proved to be the best size for regeneration from embryogenic callus and the mean number of shoots per primary callus in all genotypes achieved the highest number. The ability of the plant regeneration was also affected by genotype. W21019 had the highest number of shoots formed per primary embryogenic callus. With the optimum condition, the highest mean number of shoots per primary callus was up to 12.13, 5.73, and 3.33 in line W21019, B7, and QCL5036, respectively. The successful regeneration of the two inbred lines provides a basis for development of genetic transformation to improve priority traits such as enhanced insects and drought tolerance.
Phylogeny of Limenitidinae Butterflies (Lepidoptera: Nymphalidae) Inferred from Mitochondrial Cytochrome Oxidase I Gene Sequences

The phylogenetic analyses of the subfamily Limenitidinae are performed based on 1 471 bp of mtDNA cytochrome oxidase subunit I (COI) gene sequence data which were obtained from 21 individuals spanning 9 genera, along with those of 17 species obtained from GenBank, using Apatura iris, Aglais urticae, and Polyura dolon as outgroup species. Although the transitions at the third codon positions of the COI data set were highly saturated, they were still retained for analysis as they contain the majority of the phylogenetic information, and thus, the maximum pasimony (MP) under different weighting schemes and maximum likelihood (ML) trees were reconstructed in this study. The results showed that within this subfamily, the results based on the COI gene sequences are approximately identical to the traditional classification results. However, the clustering of Lexias pardalis and Tanaecia julii within the genus Euthalia as well as the clustering of Phaedyma aspasia within the genus Neptis with weak support are different from that of the current classification scheme made by Chinese scholars. The genus Limenitis is splited into two subclusters in the trees constructed by using MP and ML methods. These results support one of the strongest hypotheses for the tribe relationships within Limenitidinae.
Characterization of Zm26Sub5 and Its Potential Roles in Regulating Pollen Fertility of S-CMS in Maize

Mitochondrial orf355-orf77 and the nuclear fertility restorer locus Rf3/rf3 mutually control the fertility of male gametes in CMS-S in maize (Zea mays L.). A fragment of gene Zm26Sub5 was identified through cDNA-AFLP from a set of Rf3/rf3 near-isogenic lines in a previous study. In the present study, real-time PCR analysis revealed that Zm26Sub5 expression levels were much higher in pollen of S-Mo17~(Rf3Rf3) than in pollen of S-Mo17~(rf3rf3), and also higher than in fresh leaves, mature leaves, and roots of both S-Mo17~(Rf3Rf3) and S-Mo17~(rf3rf3). In silico cloning of full-length cDNA was successfully implemented. Gene Zm26Sub5 was 1 451 bp in size, of which 1 329 bp encoded a protein with 443 amino acids. The structure of this gene was analyzed by comparing its full length cDNA to homologous genomic DNA sequence (GenBank accession: Ac209463.3). Subsequent sequence analysis led to sub cellular localization of protein ZM26SUB5, and construction of a phylogenetic tree. In silico mapping indicated that Zm26Sub5 was located on chromosome 5 and closed to a reported starch-filled pollen ratio QTL. ZM26SUB5, therefore might have potential roles in repressing mitochondrial PCD which is associated with sterile activity in pollen in S-type cytoplasm.
原位低温拉曼光谱技术在人工合成CaCl2-H2O和MgCl2-H2O体系流体包裹体分析中的应用Ⅰ:低温拉曼光谱研究

利用原位低温拉曼光谱分析技术,对在设定的实验条件下合成的CaCl2-H2O体系和MgCl2-H2O体系的流体包裹体进行分析研究,结果表明低温下CaCl2水溶液和MgCl2水溶液形成的盐水合物具有各自不同的特征拉曼光谱,通过测定特征光谱,能够简易直接的鉴定这些物质,进而确定盐水体系包裹体的成分.因此,原位低温拉曼光谱技术,能够有效地测定Ca2+和Mg2+这两种盐水体系包裹体流体中常见,但显微测温过程难以观察和判别的二价阳离子.实践表明,原位低温拉曼光谱分析技术是对传统的流体包裹体显微测温技术的一个十分有效的补充,在包裹体研究领域会得到越来越广泛的应用.
对硅薄膜型太阳电池的一些思考

在当前迅速发展的绿色环保能源中,硅太阳电池一直占据着首要地位.然而晶体硅太阳电池(单晶硅和多晶硅)由于价格昂贵和材料短缺已不能满足绿色能源快速发展的需要.因此,薄膜型太阳电池已经被视为今后发展的主要方向.非晶硅薄膜太阳电池虽然在性能上还具有不少缺点,但随着薄膜沉积技术的改进以及膜本身质量的不断提高,它在太阳电池领域中仍占有一席之地.多晶硅薄膜太阳电池集晶体硅与非晶硅电池的优点为一体,也受到人们的关注.然而,后起之秀纳米硅薄膜太阳电池,依靠其本身的优越性以及当前纳米技术的进展,将会成为一个新的亮点.
原位土壤中乙草胺降解迁移规律研究

通过原位试验,研究了乙草胺在海伦农田黑土中残留和迁移的时间特征和微牛物对乙草胺的降解作用.结果显示:乙草胺按推荐量施人土壤后,在0-10cm层次微生物降解作用非常明显.使乙草胺残留显著降低,同时由于海伦黑土有机质含量高,保水能力强,凶而乙草胺不易向深层移动.但连续降水显著促进乙草胺向下层土壤迁移并有所积累,因此施药初期要尽量避开此种天气.以提高乙草胺持效性并降低其生态环境风险.
毒死蜱对土壤酶活性的影响

研究了毒死蜱胁迫对3种土壤酶(脲酶、淀粉酶、过氧化氢酶)活性的影响.结果表明,毒死蜱对3种土壤酶都有明显影响,胁迫浓度越高,对土壤酶活性的影响越大.毒死蜱对脲酶具有激活作用,但对淀粉酶和过氧化氢酶活性的抑制,将降低土壤肥力.3种土壤酶经毒死蜱胁迫处理的酶活性恢复时间与毒死蜱浓度有关,浓度越大,恢复越缓慢.
不同时期土壤有机碳(SOC)空间格局研究的主要方法

土壤有机碳作为陆地生态系统中的一个区域化随机变量,在系统内部垂直和水平发生变化的同时与大气圈和生物圈这两个碳库之间产生循环作用.为了揭示土壤有机碳的空间分布特性,传统统计学、地统计学、遥感与地理信息系统等方法被相继引入且逐渐走向成熟,其中利用遥感与地理信息系统相结合的方法来反演土壤有机碳库储量及其空间分布格局受到了越来越多的专家学者所推崇.本文在对不同方法基本理论进行简单阐述的基础上,介绍了它们在土壤有机碳的空间分布格局的研究中所取得的一些成果,并就遥感技术在反演表层土壤有机碳的空间分布格局中的应用前景进行了展望.
石灰性土壤上三种磷肥不同用量的磷肥利用率及其缓效率

供试三种磷肥虽其性质不同,但其磷肥利用率和缓效率表现趋势一致.磷肥利用率均随磷肥用量的增高而降低,呈负相关,且随种植年限的延长而减小.磷肥缓效率随磷肥用量的增加而提高,呈正相关.磷肥利用率和缓效率,过磷酸钙的利用率最大,缓效率最小;磷酸二铵磷肥利用率最低,缓效率最高;钙镁磷肥利用率及缓效率均居上述两种磷肥之间,但其P2O5用量小于142.5kg hm-2时,利用率大于缓效率,P2O5用量大于285kg hm-2时,利用率小于缓效率.由此可知:P2O5含量以水溶性为主要成分的磷酸二铵和P2O5为枸溶性的钙镁磷肥对石灰性土壤均不是理想的磷肥品种.本试验结果提示:石灰性土壤施用磷肥最好的方法是水溶性磷与枸溶性磷合理搭配,其最佳的配合比例应据当地试验结果而定.
新疆奎屯垦区土壤砷污染现状评价

研究用网格布点法在奎屯垦区三个团场共采集土壤样品67个.通过对土壤中砷的测定,利用地统计学方法与GIS技术研究了该区域土壤(0～20cm)砷的污染状况,对土壤中砷的分布进行了探讨,并对砷在土壤中的含量进行了预测.结果表明:奎屯垦区土壤砷含量为10.31～33.99 mg kg-1,平均值为20.21 mg kg-1,高于全国平均水平(11.2 mg kg-1);在所调查的67个土壤样点中有14个点超过了农田土壤环境的二级指标,超标率为20.90%,有29个点达到了警戒值;土壤砷含量大于25.00 mg kg-1的区域主要在127团的东北部和西南部,128团的西北部和中部,在129团的西部和东南部也有零星分布.
低分子有机酸对土壤中重金属的解吸及影响因素

研究了柠檬酸、草酸、酒石酸和苹果酸对矿区土壤中重金属Pb、cd、Cu和Zn的解吸行为,并探讨了介质pH值 对其解吸土中重金属的影响.振荡解吸试验结果表明四种低分子有机酸对供试污染土壤中Ph、Cd、Cu和Zn都具有一定的解吸能力.由于土壤中重金属有效态含量较低,各重金属的解吸率都不高.在对Pb和cd的解吸中,各低分子有机酸能力大小顺序为柠檬酸>酒石酸≈苹果酸>草酸;Cu的解吸顺序为柠檬酸>草酸>酒石酸≈苹果酸;Zn的解吸顺序为酒石酸>柠檬酸≈苹果酸>草酸.低分子有机酸随浓度的增加,其解吸能力提高.低分子有机酸对重金属的解吸量随pH值的降低而增加.
湿地土壤的硝化-反硝化作用及影响因素

硝化一反硝化作用与土壤的供氮能力及氮气态损失密切相关,其对于湿地氮循环的生态意义重大.综述了湿地土壤硝化-反硝化作用的研究方法、影响因素及模型表征的研究动态.当前湿地土壤硝化-反硝化作用的研究主要集中在净硝化/反硝化能力方面,而模型研究仅停留在一般概念模型和动力学模型的表征上.影响湿地土壤硝化-反硝化作用的因素主要包括温度条件、水分条件、土壤理化性质及生物区系等.鉴于当前湿地土壤硝化-反硝化作用研究内容的不均衡性和不深入性,其在今后研究中应亟需加强的领域包括:(1)硝化-反硝化作用驱动机制;(2)概念模型与应用模型表征;(3)全球变暖、降水改变及碳、氮输人等对硝化-反硝化作用的影响;(4)人类活动对硝化-反硝化作用的影响.
冻融作用对黑土重金属Zn形态转化的影响

通过对重金属Zn污染的黑土进行冻融频次和不同含水量的实验研究得到,随着冻融次数的增加,重金属Zn交换态含量,铁锰氧化物结合态含量和有机结合态含量均呈不同程度的降低趋势,残渣态含量明显增加,表明冻融作用可使土壤重金属Zn生物有效态含量降低.重金属Zn各赋存形态含量与土壤所经历的冻融次数之间呈二次多项式的函数关系,相关系数在0.948和0.988之间.随着土壤含水量的增加,冻融作用对重金属Zn交换态含量影响不大.铁锰氧化物结合态含量降低,有机结合态含量增加.而残渣态含量明显增加.
海南万宁市土壤养分状况分析

调查分析了海南万宁市土壤肥力现状,对11个乡镇的3061个土样进行分析统计.结果表明:万宁市土壤养分含量较低,特别是钾素含量严重缺乏;氮素供应水平适中;磷素含量偏低;而且各个地区含量不平衡,相差较大.此次的土壤养分调查结果揭示了万宁市不同地区的土壤养分状况,为今后土壤养分资源的综合评价和科学施肥提供了基础资料.根据上述情况提出了合理施肥及改良利用的建议.
大城市郊区耕地种植结构变化规律及其对土壤养分的影响——以北京市大兴区为例

分析了北京市大兴区1980年以来耕地种植结构的变化规律,核算了不同种植制度下的投入产出效益,并研究其对土壤肥力的影响.结果表明:(1)大兴的耕地种植结构已经从粮食为主转变成瓜菜为主,而且受政策引导效果明显.(2)不同种植制度下耕地的投入差异悬殊.表现出两极分化的趋势.耕地投入的顺序为:蔬菜>西瓜-蔬菜>小麦-玉米>-茬大田作物(粮食或油料).(3)若不计劳动力成本,不同种植制度的净收益排序同耕地投入排序是一致的.若计人劳动力成本,一茬大田由于省工,其净收益反而高于小麦一玉米轮作.(4)高投入的种植制度下土壤肥力水平相对较高,各项养分含量最高的是蔬菜地,而且不同种植制度下磷、钾含量的差异比氮含量的差异要显著.(5)不同种植制度下的土壤养分变化幅度差异显著.速效磷变化差异最明显,瓜菜种植的速效磷增幅远高于粮食作物.速效钾除了蔬菜地略有增加,其他都呈减少趋势,小麦-玉米轮作制度下的土壤有机质增幅最大.
宁夏南部山区秸秆覆盖对春玉米水分利用及产量的影响

为研究秸秆覆盖在宁南山区对春玉米生长及其土壤水分的影响,在宁夏彭阳县对三种不同秸秆覆盖处理方式进行了试验研究.对比分析了不同覆盖措施下春玉米的生长状况、产量及水分利用效率变化的关系.结果表明:采用秸秆覆盖方式可使春玉米的株高、穗位高、穗长、生物产量及经济产量等指标得到显著提高,土壤的蓄水保墒性能增强,水分利用效率提高,增产增效明显;与传统方式相比,整秸秆覆盖可使春玉米的产量及水分利用效率分别提高3.5%及16.5%.
长期施肥对黑土团聚化作用及碳、氮含量的影响

利用田间定位试验,研究了长期施用有机肥和化肥对黑土团聚化作用及碳、氮含量的影响.团聚体分级结果表明,小团聚体是土壤的主要组成部分,占土壤重量的48.86%～60.24%.长期施用有机肥可显著增加土壤中大团聚体的比例,提高土壤团聚体的稳定性;而化肥的施用则增加了土壤中微团聚体和粉+黏粒的含量,降低土壤团聚体的稳定性.施用有机肥能显著增加土壤有机碳和总氦的含量,而化肥只有与有机肥配施时才能显著增加土壤有机碳和总氮的含量.有机肥的施用能够降低土壤C/N,表明有机肥的施用更有利于土壤氮素水平的提高.
环洞庭湖区两种典型红土理化特性比较研究

通过环洞庭湖区两种典型成因红土的野外勘察与取样、室内磁化率、粒度、微量元素(Li、Rb、Sr、Ba)分析,进行两种不同成因的红土理化性质的比较.研究结果表明,风成成因的红土粒度比基岩风化成因红土明显较细,风成成因红土以粉砂为主.基岩风化型红土为砂和粉砂为主;两种成因红土受到长江中游地区高温高湿的气候条件影响,磁化率均显示为低值,明显低于黄土高原黄土和长江下游下蜀黄土;微量元素Li/Ba、Rb/Sr比值显示为高值,显著高于黄土高原黄土和长江中下游地区下蜀黄土,表明两种红土均经历了强烈的风化淋溶过程,但基岩风化型红土的风化成壤强于风成成因红土,可能基岩风化型红土经历了更长的风化成壤过程.
干湿交替过程中土壤胀缩特征的实验研究

土壤胀缩是土壤在干燥、湿润交替变化过程中所表现出的土壤容积随含水量改变的现象.本文通过测定4种土壤脱水和吸水过程中的土柱高度和直径的变化,分析了胀缩过程中土壤容积与含水量的关系及土壤的胀缩特征.结果显示:三直线模型能够很好地拟合4种土壤的收缩、膨胀过程;土壤收缩、膨胀曲线各段的特征值均小于1,这说明土壤胀缩过程中土壤容积的变化速率小于含水量的变化速率;4种土壤胀缩过程中几何因子rs大于1而小于3,且收缩初期几何因子rs等于1,表明土壤的胀缩是各向异性的,并且在土壤收缩的最初阶段只有垂直收缩.
世界石油物探市场及物探技术发展趋势分析

本文以最新的世界物探市场分析资料,从勘探与开发、投资、利润、作业队伍及新技术开发几个方面,论证了世界石油物探市场(尤其是海洋物探市场)繁荣与发展的原因,在于石油价格的高位振荡.接着阐述物探市场的繁荣也推动了勘探技术的创新与发展,导致Q、HD3D、OBC/4C、海上电磁及Geostreamer技术的广泛应用和不断完善,进而预言光纤物探技术、电磁勘探技术及Geostreamer技术必将引领新一代勘探技术发展的新潮流.
盐构造的识别、分类及与油气的关系

盐构造是近年来勘探的热点.本文详细介绍了运用重力特征、地震反射特征、现场录井及测井识别等识别盐构造的方法;分析了盐构造的沉积特点及成因;根据盐体的埋深、外部形态、盐构造成因及其与围岩的接触关系进行了分类.在此基础上,进一步论述了盐构造的形成机制、盐构造与油气的关系.由于盐构造的空间几何特征的复杂性,在勘探方法的选择上,应将三维地震观测作为基本的数据采集方式,将三维叠前深度偏移作为最终有效的处理手段.
一种改进的利用程函方程计算旅行时的方法

地震波旅行时计算是实现叠前深度偏移成像和地震层析成像的核心内容,其精度决定着最终成像效果.通过利用有限差分法求解程函方程计算地震波旅行时的方法有许多优点,一直受到人们的青睐.本文在前人提出的已知三点初至时间用程函方程求第四点初至时间的基础上,提出一种新的已知两点初至时间用程函方程求相邻第三点初至时间的计算方法,并将扩展波阵面法与局部算法综合应用,使算法更加稳健.
地震属性分析技术在波斯湾盆地中部S区块储层预测中的应用

本文以波斯湾盆地中部S区块为例,运用地震属性分析技术,结合地质、测井及地震等资料,在层位精细标定和构造精细解释的基础上,应用正演模拟方法从中优选出能够反映该区储层物性及含气性较敏感的瞬时振幅、瞬时频率、瞬时相位等3种属性,并依据这3种地震属性的分布特征,对储层的平面分布特征进行了描述.在此基础上结合测井资料,将该区储层分为四类,其中:M井区综合评价为一类储层;M井区西北综合评价为二类储层;H井区综合评价为三类储层;F井区以南综合评价为四类储层.可见地震属性分析技术可为该区隐蔽油气藏的勘探与开发提供可靠的依据.
多曲线声波重构技术在储层预测中的应用研究

针对声波测井曲线易受到各种因素的影响而不能真正反映出储层的特征,本文在对测井曲线重构方法深入研究的基础上,提出一种能真正反映储层特征的多曲线声波重构技术.这种方法由于是在保持声波曲线特性的基础上,利用自然伽马、自然电位、补偿中子及电阻率曲线(经过标准化和归一化校正)参与重构,故此法既能保持声波曲线的时深关系和所有频率信息不变,又能充分利用参与重构曲线的特征信息.通过对S区实际例子进行波阻抗反演和储层预测的应用,取得了良好的效果,表明该方法是一种简单、实用,有效的曲线重构技术,可以在实际应用中加以推广.
火山岩天然气藏评价技术研究

火山岩作为非常规储集层,由于受构造、岩相、距烃源岩远近等诸多因素控制,其分布规律与成藏条件复杂,储层类型与成藏类型多种多样.本文结合松辽盆地火山岩勘探实践,将火山岩评价技术概括为四步法:1通过重磁电震进行区域综合研究,优选有利区带;2利用地震资料进行火山岩目标预测;3利用地震属性分析技术及叠前反演技术对火山岩储层发育情况进行预测;④利用叠后和叠前流体检测技术,对火山岩储层含流体情况进行预测,圈定火山岩天然气藏的范围.从宏观到微观、从非地震到地震、从叠后到叠前、从勘探到开发是火山岩气藏评价技术应用的核心.随着勘探程度的提高,叠前火山岩储层预测技术是火山岩气藏评价技术今后的发展趋势.
基于广义S变换的地震资料高效时频谱分解

常用的谱分解方法因时窗固定,使时频分辨率不能变化;谱分解生成的若干共频率谱数据体不仅占用大量存储资源,而且使解释工作量繁重.为克服这两个问题,构造了一种小波函数可调整的广义S变换,它可根据地震信号的频率自适应地调整分析时宽,获得较理想的时频分辨率.通过研究储层的几种顶底反射系数组合在广义S变换域中的时频响应,发现其振幅极值出现的频率位置与储层厚度及反射系数的符号直接相关,利用这一规律提出了基于广义S变换的地震资料高效时频谱分解方法,从谱分解后的若干共频率数据体中抽取振幅极大值的频率数据合成一个谱极大值数据体,减少了数据的存储量,提高了信噪比.在实际资料处理中用于分析岩性、地质构造和砂岩储层的空间展布,取得了良好效果.
声波测井中泥饼折射滑行波分析方法初探

渗透层段因泥浆过滤形成泥饼,造成井径缩径,这对声波时差测井会产生一定影响.本文设计了一种三层介质的声波传播模型,首次提出了泥饼滑行波和泥饼折射滑行波的概念,给出了存在泥饼时的声波时差计算公式.用数值分析法研究了声波滑行波传播时间随泥饼厚度的变化规律,表明发射探头到接收探头的距离控制了接收声波的来源,1m源距的常规声波测井仪器接收的总是泥饼折射滑行波,当泥饼厚度均匀且各向同性时无需进行泥饼校正.而当为提高声波分辨率减小源距时,声波测井仪器所接受到的声波受泥饼厚度的影响.
时变中值滤波技术在地震随机噪声衰减中的应用

地震勘探中的随机噪声一直是影响地震信号信噪比的主要因素之一.本文针对一维经典中值滤波器对地震信号去噪能力过强而导致有用信息被破坏的缺点,基于噪声特性设定一个窗口长度控制阈值,再根据地震数据与闻值的关系选取合适的时变窗口进行中值滤波,以取得有效信号与不同强度噪声之间的最佳平衡效果.通过理论模型处理及对多个处理方法的对比,表明本方法的去噪能力优于二维多级中值滤波器,而保护有效信号的能力要优于经典中值滤波器.实际剖面的处理效果也表明,此方法不仅能有效地滤除脉冲噪声,而且能很好地保护有用信号.
溶洞物理模型地震响应及其属性分析

在叠后偏移剖面上,地下孔洞的地震响应常呈"串珠状"特征.基于地震物理正演模拟,结合实际地质孔洞的类型,本文设计了一组大小不同的孔洞模型,置于一个三层物理模型的高速层中,并进行二维数据采集.根据模型数据的偏移结果,在"串珠状"反射区进行了包括自相关函数类、频谱类、振幅类、道时频分析等多种属性的提取与分析,研究地震属性与溶洞大小的关系及因溶洞尺度大小不同导致的地震属性差异.对众多属性的分析和对比表明,孔洞纵横向尺度大小与某些地震属性存在一定的规律性,为今后在溶洞特征识别方面提供了有效分析方法.
还少丹加减治疗血管性痴呆54例

目的 探讨还少丹加减对血管性痴呆患者智力和生活能力的影响. 方法 将54例血管性痴呆患者随机分为2组,均以阿米三嗪/萝巴新(都可喜)和尼莫地平口服,治疗组在此治疗基础上,予以还少丹加减治疗,同时选用简易智力状态检查表(MMSE)和日常生活自理能力表(ADL)测定2组患者的智力和生活能力改善情况. 结果 2组治疗前后以及治疗组与对照组比较,差别有显著性(P<0.05).结论还少丹加减可改善血管性痴呆患者智力和生活能力.
方剂研究中数据挖掘方法的适用性探讨

探讨数据挖掘方法在方剂研究中的应用.就嵌入数据挖掘功能的关联型数据库,关联规则、对应分析、聚类分析方法应用、图形化知识挖掘以及多指标优化分析方法进行讨论.提出根据方剂复杂科学体系的特点,以及方剂效应评价多靶点的特征,需要在兼顾方剂文本特性和数量化特征方面丰富技术方法,提高挖掘技术的针对性和适用性,为集成方剂文献信息、评价方剂效应以及达到中医药知识发现的目的 发挥更大作用.
Evaluation and classification of residential greenbelt quality based on factor analysis & clustering analysis: An example of Xinxiang City, China

Five factors expressing greenbelt quality and one factor expressing quantity were adopted for evaluation of the residential greenbelt,and the AHP (Analytical Hierarchy Process) method was used to determine the value of factors.Thirty residential areas were selected as the samples.Two principal components were extracted and their expression was constructed by method of factor anlysis,therefore,quality evaluation of residential greenbelt was obtained.The accuracy of the function and implement quality classification toward the residential greenbelts in Xinxiang City were validated by clustering analysis method.The results showed that the greenbelt quality of fourteen residential areas was higher than the average level,of which eleven were newly-built residential areas.The 30 residential areas were classified into three types according to their greenbelt features and their formation by clustering analysis method.Finally rational proposal basing on aforesaid evaluating results was proposed for construction and renewal of residential greenbelt,upon which directive basis was provided for construction and renewal of residential greenbelt.
Ecological and economical significance of homestead forest to the household of the offshore island in Bangladesh

An explanatory survey was conducted to assess the contribution of plant diversity to the ecological and socio-economic condition of the rural household in the offshore island of Bangladesh.Assessment was done by means of multistage random sampling.The homestead sizes of the study area were classified into 3 groups viz,large (>0.25 ha),medium (0.05-0.25 ha) and small (<0.05 ha) based on the result obtained from a preliminary survey,and a total of 45 homesteads,15 from each group,were selected randomly for the study.The average annual income from homestead's plant diversity varied from Tk 5730.00 (US$95.5) to Tk 17500.00 (US$291.67).The rural people were mainly dependent on their homegarden for woodfuel and nutritional requirement as forest was unavailable in the island.The rural people here also cultivated the plant species as a safety measure from frequent cyclone.Constraints hindering the development of homestead plantation were identified and suggestions were given such as the adequate supply of seedlings of fast growing native species and conservation of endangered species to meet the demand of the household as well as to keep ecological balance.
Allelopathic effects of Leucaena leucocephala leaf litter on some forest and agricultural crops grown in nursery

An experiment was conducted to assess the effect of leaf litter of Leucaena leucocephala on two forest crops Sada koroi (Albizia procera),Ipil ipil (L.leucocephala) and three agricultural crops Falen (Vigna unguiculata),Chickpea (Cicer arietinum) and Arhor (Cajanus cajan) in the nursery of the Institute of Forestry and Environmental Sciences,Chittagong University,Bangladesh,in a Randomized Block Design.Results suggested that leaf litters of L.leucocephala induced inhibitory effects on germination and growth of bioassay.It was also found that the effect depended on concentration of extract and litterfall,type of receptor species.Higher concentration of the materials had the higher effect and vice versa.Growth response of receptor crops varied with the variation of leaf litter application.The study revealed that application of low-dose leaf litter specially litter of 10 g(m-2 had stimulating effect on shoot growth of C.arietinum,V.unguiculata and A.procera.While in all other cases significant inhibitory effect was observed and it was significantly increased with the increase of leaf litter application.However,the trend of inhibition was uneven with treatments.Root growth was found to be more affected than shoot growth.
Effects of long-term elevated CO2 on N2-fixing, denitrifying and nitrifying enzyme activities in forest soils under Pinus sylvestriformis in Changbai Mountain

A study was conducted to determine the effects of elevated CO2 on soil N process at Changbai Mountain in Jilin Province,northeastern China (42o24'N,128o06'E,and 738 m elevation).A randomized complete block design of ambient and elevated CO2 was established in an open-top chamber facility in the spring of 1999.Changpai Scotch pine (Pinus sylvestris var.sylvestriformis seeds were sowed in May,1999 and CO2 fumigation treatments began after seeds germination.In each year,the exposure started at the end of April and stopped at the end of October.Soil samples were collected in June and August 2006 and in June 2007,and soil nitrifying,denitrifying and N2-fixing enzyme activities were measured.Results show that soil nitrifying enzyme activities (NEA) in the 5-10 cm soil layer were significantly increased at elevated CO2 by 30.3% in June 2006,by 30.9% in August 2006 and by 11.3% in June 2007.Soil denitrifying enzyme activities (DEA) were significantly decreased by elevated CO2 treatment in June 2006 (P < 0.012) and August 2006 (P < 0.005) samplings in our study; no significant difference was detected in June 2007,and no significant changes in N2-fixing enzyme activity were found.This study suggests that elevated CO2 can alter soil nitrifying enzyme and denitrifying enzyme activities.
芬太尼透皮贴剂与非甾体抗炎药联合应用于晚期癌症患者的镇痛

@@ 癌痛是晚期癌症病人常见的伴随症状,芬太尼透皮贴剂作为一新型镇痛方法,是可持续72 h释放芬太尼的透皮给药装置.我科2006年3月～2007年3月,在口服芬必得的基础上应用芬太尼透皮贴剂,辅助治疗晚期癌痛患者42例,现将观察结果报道如下.
冠脉微循环与冠心病

@@ 冠心病急性心肌梗死的再灌注治疗是现代医学发展的里程碑,它使被动、保守治疗转为积极、主动的血运重建,随着包括静脉溶栓、冠状动脉内溶栓、经皮冠状动脉腔内成形术(PTCA)、冠状动脉内支架置入术以及冠状动脉搭桥术等再灌注治疗技术的成熟、普及,挽救了无数患者的生命.
会计史研究三十年

改革开放30年来我国会计史研究有着长足的发展,取得了一批高水平、为世界认可的研究成果,开展了会计史教育,形成了会计史研究的组织机构.但当前我国尚未形成完整的会计史学,历史研究对现实的促进作用不够明显,会计史研究人员亦较缺乏.我国会计史研究今后将朝着形成科学的会计史学,突出近现代会计史研究的地位和采用现代历史研究方法的方向努力.
中国代际内与代际间贴现率的实验研究

本文在区别对待代际内和代际间两种不同类型的贴现率的基础上,对基于中国居民的时间偏好的贴现行为进行了实证研究以获得更加准确的测算结果.本文采用实验经济学研究方法,在框定偏差内,利用两套不同的调查方案分别测算了代际内和代际间贴现率水平,并从个体特征影响以及贴现函数形式等方面对测算结果进行了分析.该研究结果为我国居民投资储蓄行为偏好抉择、社会代际账户测算以及大型项目评估等提供了数据支持.
中国彩票业发展的隐忧与战略选择

当前我国彩票业的繁荣背后存在隐忧.本文认为应通过政策设计调节彩票购买人群的结构,提高中高收入人群购买者比重.政策上建议将彩票定位为具有公益性质的文化娱乐消费品,根据不同购买者对不同政策的敏感点设计彩票产品,鼓励健康的出于公益和游戏动机的人群,特别是高收入阶层的彩票购买.
面向动态连锁商业数据流的分布式数据挖掘模型研究

本文在阐述动态连锁商业数据流概念的基础上,提出了面向动态连锁商业数据流的分布式数据挖掘模型,并对有关模型架构、算法和实现技术等关键内容进行了深入探讨.
保险业发展与促进经济增长的关系研究

本文利用经济内生增长模型,从理论上分析了保险业发展与促进经济增长之间的关系,得出了保险业在促进储蓄转化为投资方面具有更高效率的结论;并利用我国的实际数据对保险业发展和经济增长之间的关系进行了实证分析.结果表明:保险业的发展对我国经济增长起到了推动作用,尽管从目前来看,作用还比较有限.
吉利数字与股票价格

由于文化传统的影响,人们对数字有着一定的偏好,认为8是吉利的象征而比较偏爱,认为4不吉利而相对回避.本文主要研究这种由传统文化引起的数字上的偏好是否会在资本市场的价格上得到体现,具体来说我们研究股票交易价格的尾数是否会出现8多4少的现象,以及影响这种现象的因素.利用股票价格分笔数据,我们的实证研究结果发现股票价格中确实存在8多4少的现象,而股票的价值不确定性,股票价格高低,机构投资者交易情况和文化背景因素会对8多4少的价格聚类现象产生显著的影响.我们的研究为行为金融学提供了新的证据.
中国私营经济发展30年:理论争鸣和改革探索

改革开放30年,我国私营经济从无到有,从不允许发展到成为社会主义市场经济的重要组成部分,经历了一个曲折但又是势不可挡的快速发展过程.其间,有关私营经济的性质、地位、作用问题,姓"社"姓"资"问题,是否存在"剥削"问题,私营企业主能否入党评劳模问题,"红帽子"现象与私有财产保护问题,私营企业的"原罪"问题,市场准入与平等竞争问题,以及私营经济发展中存在的问题及解决措施等,在经济界和经济理论界引发了激烈的争论,并对改革实践产生重大的影响.本文即从理论争鸣和改革实践相结合的角度,展开对涉及我国私营经济发展的这些重大问题的讨论的回顾和综述.
FDI知识溢出与本土集群企业成长——基于嘉善木业产业集群的实证研究

引入FDI通过知识溢出带动本土集群企业成长是我国区域政府实施产业集群升级的重要政策工具.针对学术界出现的对立的"强化观"与"弱化观",从本土集群企业的视角,基于对嘉善木业集群企业的大样本问卷调查数据,本丈实证研究了FDI知识溢出对本土集群企业成长的影响.结果表明,FDI企业主导的全球网络与本土集群企业参与的本土网络虽然并非完全隔离,但是由于FDI与本土集群企业分别沿着两条相对独立的知识发展轨迹演化,因而获得FDI企业知识溢出并不能直接推动本土集群企业成长.并且由于吸收能力的对象专用性特征,本土集群企业较高的吸收能力在促进企业按照原有路径发展的同时,也带来了本地锁定问题,阻碍了企业利用FDI的知识溢出来促进企业成长.
制度均衡:一个博弈论的视角

本文根据制度的性质和环境将所有制度分为4类:完全契约下的正式制度,不完全契约下的正式制度,完全契约下的非正式制度和不完全契约下的非正式制度.从一个基准模型出发,通过不断放松假设,文章梳理了使用经典博弈论方法分析制度产生,持续或变迁的经济学文献,并归纳了若干主要结论.最后,作者结合中国的实际情况,探讨了构建一个完整的制度动态学理论所面临的研究议题.
Suppression of Soybean Oleosin Produces Micro-Oil Bodies that Aggregate into Oil Body/ER Complexes

Using RNAi, the seed oil body protein 24-kDa oleosin has been suppressed in transgenic soybeans. The en-doplasmic reticulum (ER) forms micro-oil bodies about 50 nm in diameter that coalesce with adjacent oil bodies forming a hierarchy of oil body sizes. The oil bodies in the oleosin knockdown form large oil body-ER complexes with the interior dominated by micro-oil bodies and intermediate-sized oil bodies, while the peripheral areas of the complex are dominated by large oil bodies. The complex merges to form giant oil bodies with onset of seed dormancy that disrupts cell structure. The transcriptome of the oleosin knockdown shows few changes compared to wild-type. Proteomic analysis of the isolated oil bodies of the 24-kDa oleosin knockdown shows the absence of the 24-kDa oleosin and the presence of abundant caleosin and lipoxygenase. The formation of the micro-oil bodies in the oleosin knockdown is interpreted to indicate a function of the oleosin as a surfactant.