mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Determination of lgK_(ow) and QSPR Study on Some Fluorobenzene Derivatives

In this paper,n-octanol/water partition coefficients (lgK_(ow)) of 15 fluorobenzene derivatives at 25℃ were determined with shake-flask method. Molecular structures of 19 fluorobenzene derivatives were fully optimized with B3LYP method of density functional theory (DFT) on the 6-311G** basis set. The obtained structural parameters and thermodynamic parameters were taken as theoretical descriptors with SPSS 12.0 for windows program so as to obtain the predicted correlation model of lgK_(ow).Its correlation coefficient R~2 is 0.966,and the model was verified with variance inflation factor (VIF) and t value so that the cross-validation coefficient (q~2) was obtained as 0.931. In addition,the four homogeneous compounds were predicted.
Optical Properties of Ce-Doped Lithium Niobate Crystals with Various Li/Nb Ratio

Ce-doped lithium niobate (LiNbO_3) single crystals were grown from the melts with various Li/Nb molar ratios (0.750,0.850,0.946,1.100,1.250 and 1.380) by Czochralski method,while doping concentration of Ce was 0.1 mol%. Infrared spectra (IR) and Ultraviolet-visible absorption spectra (UV) of the crystals were measured to investigate the location of Ce ions and defect structure in crystals. The writing time,erasing time,photorefractive sensitivity and dynamic range were measured by two-wave coupling equipment. The results showed that Ce takes the place of Li lattice site,and the LiNbO_3 crystal grown from the melt with Li/Nb ratio of 1.250 is stoichiometric crystal,which has the best properties due to the synergistic effect of Ce ion and Li/Nb ratio. Also the influence of various Li/Nb ratios on the defect structure and optical properties of the crystal was reported.
Syntheses and Single-crystal Structures of Er_3Ge_xGeS_7(1/4≤x≤1/2)

As part of our systematic research on the acentric rare earth chalcogenides,the ErAIGeS_5/KBr,Er_3AgGeS_7/KBr and Er_6Ge_3S_(14)/KBr systems were investigated and three compounds belonging to the R_6B_2C_2Q_(14)(R=rare earth,B=6-coordinated element,C=4-coordinated element,Q=S and Se) family were identified. These compounds crystallize in the P63 space group,and the crystal data are as follows: Er_3Ge_(1/4)GeS_7,α=9.6480(14),c=5.7920(12)(A),Z=2; Er_3Ge_(0.382(8))GeS_7,α=9.6360(14),c=5.8460(12)(A),Z=2; Er_3Ge_(1/2)GeS_7,α= 9.6061(13),c= 5.8346(18)(A),Z=2.Single-crystal analysis indicated that the Er_3Ge_xGeS_7(x=1/4,0.382(8),1/2) structures consist of three types of building blocks: ErS_7,GeS_4 and GeS_6 units. Er_3M_xGeS_7 are deficient compounds with the B sites occupied partly by Ge(Ⅳ) and/or Ge(Ⅱ).
IDW在医学断层图像可视化中的应用

针对在医学三维数据场可视化过程中用三线性插值方法显示三维图像在绘制速度中的不足,利用反距离加权插值方法应用到医学断层图像可视化中.详细介绍了反距离加权插值算法的基本原理、实现技术和实验结果,实验证明该方法在不明显降低绘制质量的前提下.降低了插值次数,提高了绘制速度.
Ghrelin的合成与分泌及其影响因素

Ghrelin是由28个氨基酸组成的一种脑肠肽.除了可以刺激生长激素释放以外,ghrelin具有促进摄食、调节能量代谢等多种中枢及外周的重要功能.本文总结近年关于ghrelin合成与分泌的研究成果,简要介绍ghrelin基因转录、ghrelin蛋白质的加工修饰及其相关调控机制,并从营养物质、激素、自主神经系统、机体生理状态和病理状态等方面,介绍影响ghrelin水平的一些主要因素.
妊娠期高血压疾病的降压治疗

妊娠期高血压疾病能否得到及时合理的治疗,直接关系到孕妇和胎儿的安危.主要介绍妊娠期高血压疾病的类型及不同程度、不同类型高血压的处理措施.同时对妊娠期降压药物的合理选择进行了探讨.
小儿阑尾炎的腹腔镜阑尾切除术115例临床体会

目的 探讨小儿阑尾炎的腹腔镜阑尾切除术的应用及技巧.方法 分析 2003年2月～2008年9月115例小儿阑尾炎患者采用腹腔镜阑尾切除术治疗的临床资料.结果 115例均成功完成手术.满意恢复出院.结论 腹腔镜阑尾切除术是目前小儿阑尾炎治疗的一种较好术式选择,在应用熟练及掌握技巧基础上,提倡用于小儿阑尾炎.
重症肌无力单链抗体融合蛋白的酵母菌表达及特异性鉴定

目的: 真核表达抗人乙酰胆碱受体单链抗体637(scFv637)与人血清白蛋白(HSA)的融合蛋白,以提高融合蛋白的产量和增强其生物学活性.方法: 将携带有重组质粒的毕赤酵母菌GS115用G-418筛选高拷贝重组转化子克隆,诱导表达目的蛋白,表达产物用斑点杂交试验检测,并以SDS-PAGE鉴定融合蛋白的相对分子质量(Mr),应用间接免疫荧光技术确定融合蛋白与人肋间肌乙酰胆碱受体(AChR)的亲和性.结果: 斑点杂交试验显示成功表达出目的蛋白,其Mr约为97 400,在人肋间肌细胞膜之间有荧光出现.结论: 在毕赤酵母菌GS115中成功表达出scFv637-HSA融合蛋白,并且融合蛋白可以与人肋间肌AChR结合,这为进一步研究融合蛋白的功能和应用奠定了基础.
职业性三氯乙烯药疹样皮炎CXCR2和CXCR3基因的表达

目的: 建立荧光定量PCR检测三氯乙烯药疹样皮炎(DMLT)患者外周血淋巴细胞CXCR2和CXCR3 mRNA表达的方法.方法: 利用SYBR Green荧光定量PCR分别检测24例DMLT患者、 26例正常人外周血淋巴细胞CXCR2和CXCR3基因mRNA表达情况,以β2微球蛋白基因作为内参,根据相对定量公式 (2~(-△△C)T)计算DMLT患者与正常人CXCR2和CXCR3基因表达差异倍数.结果: 24例患者外周血淋巴细胞荧光定量PCR均检出CXCR2和CXCR3 mRNA表达,其中CXCR2表达情况有两种: 表达上升14例(58.3%)和表达下降10例(41.7%),与正常人CXCR2 mRNA相比表达倍数分别为16.76±7.01、 0.54±0.30;CXCR3表达显著升高(△C_T=6.3±2.8,11.4±1.9;P<0.01),与正常人CXCR3 mRNA相比表达倍数为33.37±31.61.结论: 成功建立了DMLT患者外周血淋巴细胞CXCR2和CXCR3mRNA表达的荧光定量PCR方法.
骨髓间充质干细胞移植促肾缺血-再灌注损伤修复的机制初探

目的: 探讨骨髓间充质干细胞(BMSCs)促肾缺血-再灌注损伤修复的能力及机制.方法: 取健康3周龄C57BL/6J小鼠的骨髓细胞悬液,进行BMSCs体外扩增培养.将8周龄C57BL/6J小鼠随机分为假手术组(10只)、平行对照组(10只)和细胞移植组(28只).建立肾缺血-再灌注损伤模型,将BMSCs移植到细胞移植组小鼠中,平行对照组注射生理盐水.通过检测肾功能观察BMSCs对肾损伤的促修复作用.并通过检测氧化应激指标和观察蓝色荧光标记供体BMSCs在受体内的踪迹,初步探讨BMSCs促宿主损伤肾组织修复的机制.结果: 分离培养的BMSCs增殖旺盛,纯度较高,且均质性和稳定性好.平行对照组表现为小鼠整体状态差,肾功能指标和氧化应激指标都没有得到改观.细胞移植组小鼠整体状态良好,肾功能指标和氧化应激指标明显改善(P<0.05).并在宿主恢复的肾组织中发现了较多的带有蓝色荧光的细胞存在.结论: BMSCs在体外易分离培养,具有旺盛的增殖能力;移植BMSCs后,具有向受损组织归巢的作用,并参与和提高肾缺血-再灌注损伤后宿主C57BL/6J小鼠的恢复.
Response of soil catalase activity to chromium contamination

The impact of chromium (Ⅲ) and (VI) forms on soil catalase activity is presented.The Orthic Podzol,Haplic Phaeozem and Mollic Gleysol from different depths were used in the experiment.The soil samples were amended with solution of Cr(Ⅲ) using CrCl_3,and with Cr(VI) using K_2Cr_2O_7 in the concentration range from 0 to 20 mg/kg,whereas the samples without the addition of chromium served as control.Catalase activity was assayed by one of the commonly used spectrophotometric methods.As it is demonstrated in the experiment,both Cr(Ⅲ) and Cr(VI) forms have ability to reduce soil catalase activity.A chromium dose of 20 mg/kg caused the inhibition of catalase activity and the corresponding contamination levels ranged from 75% to 92% for Cr(Ⅲ) and 68% to 76% for Cr(VI),with relation to the control.Catalase activity reached maximum in the soil material from surface layers (0-25 cm),typically characterized by the highest content of organic matter creating favorable conditions for microorganisms.
Atmospheric lead pollution in fine particulate matter in Shanghai,China

The Pb-monitoring program was extended for 6 years from 2002 to 2007 at 17 representative urban sites (6 traffic,5 industrial,and 6 residential sites),and 3 suburban sites to assess the lead pollution in fine particulate matter (PM2.5) after phasing out leaded gasoline in Shanghai.Compared with Pb levels reported in other places,the Pb pollution in Shanghai still serious after phasing out leaded gasoline,which remains at high concentration range (213-176 ng/m~3) in PM_(2.5) in winter.Significant spatial variation of Pb concentrations and strong seasonal variation of higher Pb concentration in winter than that in summer were detected.The size distribution of Pb in particulate matter has a unimodal mode that peaks at approximately 0.154-1.59 mm particle diameter,indicating that Pb is mainly concentrated in fine fraction.Lead in the fine fraction is enriched by a factor of 10~3-10~4 relative to Pb abundance in crust.Eight categories of Pb pollution sources were identified in the PM_(2.5) in the winter of 2007 in Shanghai.The important emission sources among them are vehicle exhaust derived from combustion of unleaded gasoline,metallurgic industry emission,and coal combustion emission.
One century record of contamination by polycyclic aromatic hydrocarbons and polychlorinated biphenyls in core sediments from the southern Yellow Sea

Sixteen polycyclic aromatic hydrocarbons (PAHs) and 28 polychlorinated biphenyls (PCBs) were measured at a 2-cm interval in a core sample from the middle of the southern Yellow Sea for elucidating their historical variations in inflow and sources.The chronology was obtained using the ~(210)Pb method.PAHs concentrations decreased generally with depth and two climax values occurred in 14-16 cm and 20-22 cm layers,demonstrating that the production and usage of PAHs might reach peaks in the periods of 1956-1962 and 1938-1944.The booming economy and the navy battles of the Second World War might explain why the higher levels were detected in the two layers,respectively.The result of principal component analysis (PCA) revealed that PAHs were primarily owing to the combustion product.Down-cored variation of PCB concentrations was complex.Higher concentrations besides the two peaks same as PAHs were detected from 4 to 8 cm,depositing from 1980 to 1992,which probably resulted from the disposal of the out-dated PCB-containing equipment.The average Cl percentage of PCBs detected was similar to that of the mixture of Aroclor 1254 and 1242,suggesting they might origin from the dielectrical and heat-transfer fluid.The total organic carbon (TOC) content played a prevalent role in the adsorption of high molecular weight PAHs (≥ four-ring),while no obvious relationship among total PCBs,the concentration of congeners,and TOC was found.
Potential toxic risk of heavy metals from sediment of the Pearl River in South China

Based on the monitoring of five heavy metal elements in the surface sediments of the Pearl River in South China,potential toxicity of the heavy metals was assessed using consensus-based sediment quality guidelines (SQGs) method and compared with geo-accumulation (I_(geo)) index method.The monitoring results showed the heavy metal concentrations were significantly and positively correlated with each other,demonstrating a common trend in variation of concentration in the surface sediments.The assessment using the consensus-based SQGs method showed the potential toxicity of Cu was the highest,and Cd was the lowest.The evaluation based on mean probable effect concentration (PEC) quotient showed the region was seriously polluted with high toxicity heavy metals.Correlation analysis revealed a significant and positive correlation between the mean PEC quotient and the average of I_(geo) with a correlation coefficient of 0.926 (n = 23,P < 0.01).In conclusion,the consensus-based SQGs and mean PEC quotient are applicable to assessment of potential toxicity risks of heavy metals in freshwater sediments in the Pearl River.
Integrated assessment of river health based on the conditions of water quality,aquatic life and physical habitat

The health conditions of Liao River were assessed using 25 sampling sites in April 2005,with water quality index,biotic index and physical habitat quality index.Based on the method of cluster analysis (CA) for water quality indices,it reveals that heavily polluted sites of Liao River are located at estuary and mainstream.The aquatic species surveyed were attached algae and benthic invertebrates.The result shows that the diversity and biomass of attached algae and benthic index of biotic integrity (B-IBI) are degrading as the chemical and physical quality of water bodies deteriorating.Physiochemical parameters,BOD_5,COD_(Cr),T_N,T_P,NH_(3-N),DO,petroleum hydrocarbon and conductivity,were statistically analyzed with principal component analysis and correlation analysis.The statistical results were incorporated into the integrated assessing water quality index,combining fecal coliform count,attached algae diversity,B-IBI and physical habitat quality score,a comprehensive integrated assessing system of river ecological health was established.Based on the systimetic assesment,the assessed sites are categorized into 9 "healthy" and "sub-healthy" sites and 8 "sub-sick" and "sick" sites.
离心铸造轧辊冷型的焊补

随着现代轧钢业的快速发展,钢厂对轧辊的需求量越来越大,对轧辊性能的要求越来越高,离心铸造轧辊具有优良的使用性能,得到了广泛应用.在离心铸造轧辊生产过程中,离心铸造轧辊所用的冷型材质通常是灰铸铁,因为在工作时受到严重的激冷激热及振动,所以在冷型的内表面很容易产生裂纹.
量子光谱成像实验研究新进展

由中国科学院西安光学精密机械研究所毕思文研究员领导的量子光谱成像课题组经过三年的努力，搭建了制备压缩态光场成像的实验平台并设计了成像系统．用该系统进行压缩态光场实验、平衡零拍探测、成像分辨率测试，在2009年5月20日完成量子成像第一次实验；在同年7月12El成功完成第二次实验．实验结果表明：在压缩光光强为10uW～15uW情况下，压缩光源可以成像；在相同功率下，用压缩光测同一物体所得的分辨率为10LP／mm，是相干光测试的1．43倍
700MPa级合金结构钢薄板焊接工艺研究

通过对700MPa级合金结构钢薄板焊接工艺的试验,得出其较佳的焊接工艺参数,采取相应的工艺措施,有效的控制了高空作业车伸缩臂的焊接变形,为700MPa级合金结构薄板的推广应用提供了经验和数据.
地震灾害救治中医院信息统计工作面临的问题及体会

地震灾害发生后,医院医护人员担负着抢救生命的神圣使命,信息统计人员担负着为应急指挥提供信息参考,为伤病员及家属提供信息服务的双重职责.笔者通过地震灾后救治过程中信息统计工作的实际情况,谈谈医院应急信息统计工作面临的问题和体会,以期为完善政府应急体系建设和医院信息统计工作提供参考.
恶性肿瘤患者不规则抗体分析

不规则抗体在临床输血中可引起溶血性输血反应,抗体筛选有利于及时发现有临床意义的不完全抗体,避免溶血性输血反应的发生,保证患者用血安全.对有输血史、妊娠史需要输血的患者应进行抗体筛查.
内蒙古锡林郭勒天然草地非共生固氮细菌的分布和数量动态

氮素(N)是植物生长发育所必需的,且最易缺乏.研究表明氮素含量直接影响草地生态系统的第一生产力,且退化草地无一例外地表现为土壤氮素严重缺乏~([1～4]).
铁路配电网自闭贯通线路故障定位系统

介绍了铁路配电网自闭贯通线路故障定位系统的设计与实现,该系统是一种基于故障指示器技术和通用分组无线业务技术的故障定位系统,可实现铁路配电,网的故障检测、定位及故障类型判断等.故障发生时,在系统监控中心界面上迅速显示故障的时间、地点、相位、类型等信息.该系统的应用提高了故障查找的工作效率,缩短了停电时间.
MAPK级联信号通路与血管性痴呆的相关性研究进展

丝裂原活化蛋白激酶(MAPK)级联信号通路是介导细胞反应的重要信号系统,是细胞外信号从细胞表面传导到细胞内部的重要传递途径,在细胞增殖、分化、凋亡过程中发挥重要作用.血管性痴呆是脑血管病引起的获得性智能损害综合征,学习和记忆障碍是其主要表现.长时程增强(LTP)被认为是与学习、记忆密切相关的神经突触可塑性的生物学基础.MAPK的上游调节物质和下游作用分子在神经元中广泛存在,MAPK级联信号通路通过磷酸化神经元参与LTP诱导与维持的多种受体和酶,影响神经突触可塑性.因此,MAPK级联信号通路可能从分子水平上参与了血管性痴呆的发病机制.
新型口服抗血小板减少药物——eltrombopag

Eltrombopag(商品名为PROMACTA~(R))是一种血小板生成素(thrombopoietin,TPO)受体激动剂,由葛兰素史克公司研发,2008年11月20日获美国FDA批准上市,用于治疗对糖皮质激素、免疫球蛋白或脾切除术反应欠佳的慢性特发性血小板减少性紫癜(idiopathic thrombocytopenic purpura,ITP).分子式为C_(25)H_(22)N_4O_4·2(C_2H_7NO),相对分子质量564.65.
针刺对运动性失眠大鼠大脑c-fos及c-jun含量的影响

目的 通过对运动性失眠大鼠进行针刺治疗,探讨针刺疗法治疗运动性失眠的机理和疗效.方法 雌性SPF级别SD系列大鼠40只,随机分正常组、对照组、西药组和针刺组,每组10只.针刺组头部百会穴处沿督脉方向进行皮下针刺,西药组注射安定.除正常组外,对照组、西药组、针刺组大鼠进行Y型迷宫、大鼠跑台练习;1周后,在腹腔注射对氯苯丙氨酸.48 h后,采用免疫组化的方法检测大鼠大脑内的c-fos和c-jun含量.结果 与正常组对比,所有失眠大鼠大脑内的大脑内的c-fos和c-jun均升高(P<0.05);针刺能够改善失眠,降低失眠大鼠大脑内c-fos和c-jun (P<0.05).结论 针刺疗法可能是通过调节大脑内c-fos和c-jun的表达来治疗运动性失眠,是治疗失眠的理想方法.
几种石灰性土壤游离氨基酸的研究

采用茚三酮比色法,测定3种石灰性土壤的游离氨基酸含量,研究不同类型对土壤游离氨基酸含量的影响.结果表明:黑垆土、红油土、淋溶褐土0～20 cm土层游离氨基酸(以N计,下同)含量为7.18、7.42、7.41 mg/kg,分别占可溶性有机氮(SON)的30.53%、19.23%和17.50%,占全氮的0.74%、0.71%和0.71%.土壤类型对土壤游离氨基酸含量、游离氨基酸占土壤全氮的比例无显著影响,而对游离氨基酸占SON的比例有显著影响.林地有机层的游离氨基酸为10.95～25.47 mg/kg,约为林地0～20 cm土层(7.32 mg/kg)的2.5倍.林地(7.32 mg/kg)与农田0～20 cm土层土壤游离氨基酸含量(7.18 mg/kg)相当.相关分析表明,土壤游离氨基酸含量与土壤SON、土壤全氮、硝态氮、铵态氮、有机质等土壤肥力之间均有极显著的正相关性.
播种期对波斯菊观赏性及采种的影响

观察不同播种期对早、中、晚熟3个波斯菊品种观赏及采种的影响,结果表明:作为观赏栽培,早、中、晚熟3个品种的最佳播种期都为6月29日左右,开花整齐,植株高矮适中,观赏性强;作为采种栽培,中熟品种的最佳播种期为6月29日左右,平均产量为 33 kg/667m~2 左右;晚熟品种的最佳播种期为6月13号左右,平均产量为35 kg/667m~2左右;而早熟品种不太适宜在本地区采种栽培.
绿萝不同基质扦插繁殖效果比较试验

不同基质扦插繁殖效果比较试验表明,适宜绿萝扦插苗生长的最佳基质配方是35.3%木糠+35.4%泥炭土+20%珍珠岩+6%石灰+2%奥绿复合肥+0.6%呋喃丹+0.7%敌克松,扦插成活率为100%.
Cr~(3+)对小麦种子萌发及幼苗生长的影响

研究不同浓度重金属离子Cr~(3+)对小麦种子萌发及其幼苗生长的毒害作用,试验结果表明:Cr~(3+)对小麦种子萌发和幼苗生长的影响临界浓度区间为40～45 mg/L,即Cr~(3+)浓度低于40 mg/L促进小麦种子的萌发和幼苗的生长,高于45 mg/L则抑制小麦种子的萌发和幼苗的生长;Cr~(3+)对小麦幼苗根生长的抑制作用大于对芽生长的抑制作用;高浓度的Cr~(3+)对小麦种子萌发和幼苗生长的抑制是通过抑制淀粉酶的活性来实现的.
黑色杂交粳稻的选育研究和利用

本研究通过回交、杂交等途径育成了黑米不育系香血粳A等黑色杂交稻,从而改善了黑米稻的有关不良性状.初步研究表明,黑米三系杂交稻株型好,抗性好,产量高.
魔芋叶片离体诱导试管微球茎发生的培养条件优化

以白魔芋、花魔芋、谢君魔芋的试管苗叶片为材料,利用正交设计对魔芋试管微球茎离体发生的诱导培养基及培养条件进行了优化筛选.结果表明,叶片诱导试管微球茎发生的培养温度、光照强度及碳源组合是主要的限制因子.改良MS培养基中添加NAA 0.5 mg/L、KT 0.5 mg/L,碳源组合为4%S(蔗糖)+4%M(甘露醇)为最佳诱导培养基;培养温度28 ℃、光照8 h/d、光照强度800 lx为最佳培养条件.在该条件下,3个魔芋种的3种外植体(复叶、复叶块、小叶片)的微球茎诱导率均在88%以上.
抗虫棉及其杂交后代Bt基因的检测

根据Bt基因序列设计特异引物,对100株抗虫棉杂交后代进行PCR扩增,获得98个Bt基因条带,Bt条带出现频率为98%;对其他10个棉花品种基因组进行Bt基因扩增,抗虫棉中棉所45出现Bt基因特异条带,除非转基因亚洲棉中出现Bt条带外,其他非转基因棉品种均无Bt基因条带.
《素问》考释二则

<黄帝内经>是一部历史悠久的医学巨著,内容博大,语言古朴,是后世人们研习中医的必读之书.但由于年代久远,书中存有诸多争议之处.这些争议之处,有的已为历代注家解决,有的却仍未能解疑.笔者在教学之余,研读<内经>,对其中<素问·宝命全形论篇>之"血气争黑"和<素问·诊要经终论篇>之"间者环也"两个语言文字问题,运用多种训诂方法,进行了语义上的考释与证明,祈请方家斧正.
婴儿脑瘫的胎盘病理

脑瘫是中枢神经系统的一种慢性发育性残缺,具有无法控制的运动和姿势.婴儿脑瘫伴有高死亡率和长期发病率,过去传统地认为其病因是产程处理不当或产伤所致,在产科诉讼中往往定为重大过失.但从20世纪80年代中期以来,学者们对脑瘫的病因从流行病学、病理生理学、分子生物学等多方面进行了探索,从而提出了新的看法.
喜旱莲子草生物防治作用物资源及其控制作用

本文对喜旱莲子草主要生物防治作用物资源的分类概况,优势和潜力生防作用物的种类及其控制作用的应用局限,潜力生防作用物的控制作用进行了概述.针对当前喜旱莲子草生物防治过程中存在的问题,提出了建议和应对策略.
手法联合梅花针叩刺治疗脊源性胸痛临床观察

脊源性胸痛是指由于颈、胸椎原位病变引起胸部隐痛、紧束痛、闷痛、心律失常等类似冠心病的症状,属于脊柱相关性疾病.资料表明约有1/2胸痛属于脊源性胸痛.本临床观察旨在评价推拿手法联合梅花针叩刺治疗脊源性胸痛的疗效并对其机理作相关的阐述.
农村致富带头人能力结构及形成机制研究

通过对农村致富带头人能力结构分析,探讨了能力形成的动态性,并运用SECI知识转化模型和动态能力理论,指出农村致富带头人能力形成的方式:"干中学"和隐性知识显性化.同时指出在新农村建设过程中,政府大力扶持农村致富带头人,有利于促进农村合作组织的发展,对促进农业产业结构的调整和农村经济发展具有重要意义.
水稻茎秆形态结构与倒伏的研究进展

综述了近年来国内外关于水稻倒伏的类型、成因、茎秆结构、株高、力学基础研究以及提高水稻抗倒伏能力的一些措施,展望了当前水稻抗倒研究的方向.
氮素与密度对稻田春玉米产量的影响及相关性研究

以杂交种登海11号(DH11)为材料,在氮素与密度相互作用条件下,对DH11的产量形成进行了研究试验,并对植株高度、最大叶面积指数等4个因素与产量进行相关性分析研究.试验结果表明:氮肥和密度对玉米品种登海11的产量以及农艺性状产生显著的影响,并主要通过影响穗粒数和千粒重来实现.其中,密度为(4.8万株/hm~2),施氮量为(240 kg/hm~2)时的产量较高.相关性分析结果表明,吐丝期地上生物量、吐丝至成熟期干物质积累速率、玉米植株株高和最大叶面积指数均与产量成显著正相关,相关系数分别为0.849 2、0.791 6、0.778 0和0.5704.
Application of Ionic Liquid in Upgrading 6~# Solvent Oil

A new method of upgrading 6~# solvent oils using different ionic liquids as catalysts in a continuous ap-paratus is studied in this paper. The results show that aromatics, olefins and small quantity of sulfurs can be re-moved simultaneously. Using complex ionic liquid modified with CuCl as catalyst, olefins are removed completely, the mass concentrations of aromatics and sulfurs in solvent oil are 0.36% and 0.0058%, respectively, and the bromic index is zero. The sulfur removal rate decreases gradually with increasing of running time. The refined 6# solvent oil is corresponded to the quality standards of GB16629-1996, which request that the mass concentrations of aro-matics, sulfurs and bromic index are 1%, 0.012% and 1000, respectively. The loss of solvent oil is less than 3%. # solvent oil
Micromixing Efficiency of Viscous Media in Micro-channel Reactor

Micromixing efficiency of viscous media in Y-type micro-channel reactor was studied by using iodide-iodate test reaction as working system. Experiments were carried out in water-glycerin mixtures with 7 dif-ferent viscosities. The experimental results showed that segregation index of the micro-channel reactor increases with the decrease of volumetric flow rate and the increase of solution viscosity. Based on the incorporation model, the micromixing time tm of the micro-channel reactor was estimated in the range of 10~(-4)-10~(-3) s at different viscosi-ties, which indicated that the micro-channel reactor possesses a much better micromixing performance compared to the stirred tank (t_m=0.02-0.2s).
Analytical models for the base transit time of a bipolar transistor with double base epilayers

The doping profile function of a double base epilayer is constructed according to drift-diffusion theory.Then an analytical model for the base transit tim τb is developed assuming a small-level injection based on the characteristics of the 4H-SiC material and the principle of the 4H-SiC BJTs. The device is numerically simulated and validated based on two-dimensional simulation models. The results show that the built-in electric field generated by the double base epilayer configuration can accelerate the carriers when transiting the base region and reduce the base transit time. From the simulation results, the base transit time reaches a minimal value when the ratio of L_2/L_1is about 2.
Effect of chemical polish etching and post annealing on the performance of silicon heterojunction solar cells

Amorphous/crystalline silicon heterostructure solar cells have been fabricated by hot wire chemical vapor deposition (HWCVD) on textured p-type substrates. The influence of chemical polish (CP) etching and the post annealing process on the solar cell performance have been studied. The CP treatment leads to a reduction of stress in the i-layer by the slight rounding of the pyramid peaks, therefore improving the deposition coverage and the contact by each layer, which is beneficial for the performance of the solar cells. An optimized etching time of 10-15 s has been obtained. A post annealing process leads to a considerably improved open voltage (V_(oc)), filled factor (FF), and conversion efficiency (η) by restructuring the deposited film and reducing the series resistance. An efficiency of 15.14% is achieved that represents the highest result reported in China for an amorphous/crystalline heterostructure solar cells based on the textured p-type substrates.
180例新式剖宫产术临床分析

新式剖宫产采用腹部横直切口,钝性分离脂肪、腹直肌及腹膜,不缝合腹膜.现将我院开展的新式剖宫产术180例报告如下.1资料与方法1.1 一般资料我院2006年1月至2008年12月共施行剖宫产手术360例,年龄21～37岁,孕36～42周.分为观察组180例,采用新式剖宫产术式;对照组180例,采用子官下段剖官产术式.
艾滋病病毒的分子生物学检测进展

获得性免疫缺陷综合征(acquired immunodefi-ciency syndrome,AIDS)简称艾滋病,是由人类免疫缺陷病霉(human immunodeficiency virus,HIV)感染所引起的一种严重的传染性疾病.目前,筛查主要依靠免疫学方法.但由于该方法灵敏度低,不能检测出处于窗口期和新近感染病毒的感染者,可导致漏检.
中亚天山是全球气候变化和水循环变化的热点地区

新疆水资源有80%以上形成于盆地周围的中高山区,其中高山地区的冰川和积雪融水是内陆河流的主要补给源,随着全球变化引起的高山寒区升温和降水变化在此反映敏感,已经显示出自20世纪80年代中期以来的异常变化.一方面,气温持续升高可以加速冰川消融,导致冰川面积缩小,冰厚减薄,运动速度加快等;另一方面,降水量的增大又将增大冰川物质积累,加快冰川运动,促使冰川前进.
让昨天告诉今天:人工腕关节置换的学术研究与技术进展

1890年,德国医生Themistocles Gluck(1853～1942年)完成了世界上第一例全腕关节置换术.关节成形术对于很多关节疾患来说是最好的手术方法,但其在腕关节中的应用并不普遍.1980年6月9日Themistocles Gluck教授在柏林为1例腕关节结核的患者做了象牙全腕关节成形术,由于结核感染,结果失败了.
日本弥散性血管内凝血治疗指南解读

由日本血栓止血学会学术专门委员会弥散性血管内凝血(DIC)部组织撰写的"日本DIC治疗指南",按照循证医学(EBM)概念进行系统的文献检索,参考日本血液学会和日本临床血液学会专家的反馈加以修改,论述并点评了DIC的基础疾病治疗、抗凝治疗、纤溶调节治疗和补充治疗,并就其可信度分级推荐.
Global impulsive exponential synchronization of stochastic perturbed chaotic delayed neural networks

In this paper,the global impulsive exponential synchronization problem of a class of chaotic delayed neural networks (DNNs) with stochastic perturbation is studied. Based on the Lyapunov stability theory,stochastic analysis approach and an efficient impulsive delay differential inequality,some new exponential synchronization criteria expressed in the form of the linear matrix inequality (LMI) are derived. The designed impulsive controUer not only can globally exponentially stabilize the error dynamics in mean square,but also can control the exponential synchronization rate. Furthermore,to estimate the stable region of the synchronization error dynamics,a novel optimization control algorithm is proposed,which can deal with the minimum problem with two nonlinear terms coexisting in LMIs effectively.Simulation results finally demonstrate the effectiveness of the proposed method.
Impulsive control for a Takagi-Sugeno fuzzy model with time-delay and its application to chaotic systems

A control approach where the fuzzy logic methodology is combined with impulsive control is developed for controlling some time-delay chaotic systems in this paper. We first introduce impulses into each subsystem with delay of the Takagi-Sugeno (TS) fuzzy IF-THEN rules and then present a unified TS impulsive fuzzy model with delay for chaos control. Based on the new model,a simple and unified set of conditions for controlling chaotic systems is derived by the Lyapunov-Razumikhin method,and a design procedure for estimating bounds on control matrices is also given.Several numerical examples are presented to illustrate the effectiveness of this method.
Asymptotic solution for a perturbed mechanism of western boundary undercurrents in the Pacific

This paper consider a class of perturbed mechanism for the western boundary undercurrents in the Pacific. The model of generalized governing equations is studied. Using the perturbation method,it constructs the asymptotic solution of the model. And the accuracy of asymptotic solution is proved by the theory of differential inequalities. Thus the uniformly valid asymptotic expansions of the solution are obtained.
The remote implementation of all possible generalized quantum measurements on a single atomic qubit in a quantum network

To implement generalized quantum measurement (GQM) one has to extend the original Hilbert space.Generally speaking,the additional dimensions of the ancilla space increase as the number of the operators of the CQM n increases.This paper presents a scheme for deterministically implementing all possible n-operator GQMs on a single atomic qubit by using only one 2-dimensional ancillary atomic qubit repeatedly,which remarkably reduces the complexity of the realistic physical system.Here the qubit is encoded in the internal states of an atom trapped in an optical cavity and single-photon pulses are employed to provide the interaction between qublts.It shows that the scheme can be performed remotely,and thus it is suitable for implementing GQM in a quantum network.What is more,the number of the total ancilla dimensions in our scheme achieves the theoretic low bound.
A counterexample of the Euler condition:the Appell-Hamel dynamical system on a horizontally moving plate

As a counterexample of the Euler condition for nonholonomic constraint problems [H.C.Shen,Acta Phys.Sin.54,2468 (2005)],we investigate the Apell-Hamel dynamical system on a horizontally moving plate.The inconsistency of the results with Newton mechanics suggests that the Euler condition is not a universal model for nonlinear nonholonomic systems.This is attributed to the fact that the virtual displacements so obtained are not normal to the constraint forces.