mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Stochastic resonance in a single-mode laser driven by quadratic Pump noise and amplitude-modulated signal

This paper investigates the phenomenon of stochastic resonance in a single-mode laser driven by quadratic pump noise and amplitude-modulated signal.A new linear approximation approach is advanced to calculate the signal-to-noise ratio.In the linear approximation only the drift term is linearized,the multiplicative noise term is unchangeable.It is found that there appears not only the standard form of stochastic resonance but also the broad sense of stochastic resonance,especially stochastic multiresonance appears in the curve of signal-to-noise ratio as a function of coupling strength λ between the real and imaginary parts of the pump noise.
Coupled flexural-torsional vibration band gap in periodic beam including warping effect

The propagation of coupled flexural-torsional vibration in the periodic beam including warping effect is investigated with the transfer matrix theory.The band structures of the periodic beam,both including warping effect and ignoring warping effect,are obtained.The frequency response function of the finite periodic beams is simulated with finite element method,which shows large vibration attenuation in the frequency range of the gap as expected.The effect of warping stiffness on the band structure is studied and it is concluded that substantial error can be produced in high frequency range if the effect is ignored.The result including warping effect agrees quite well with the simulated result.
当前农户农村居民点用地集约利用意愿的实证分析——以江西省为例

本文通过对江西省5市8个县(区)20个自然村的农村居民点用地集约利用专题调研,以农户"是否愿意服从政府的统一规划来建房"作为衡量农户农村居民点用地集约利用意愿的指标,在提出有关理论假设前提的基础上,通过建立Logistic模型,从农民自身特征、农户家庭特征、农户现有居住特征和区域社会经济特征四个方面进行了实证分析.研究结果表明:在农民自身特征、农户家庭特征、农户现有居住特征、区域社会经济四类指标中,农民文化程度、常年居住在家人口数量、人均年收入、与邻院的最近距离、人均宅基地面积和离县城的距离六个因素对农户集约利用农村居民点用地的意愿有着显著的影响.
邯郸市蚊类区系调查

邯郸市位于河北省最南部,与晋、鲁、豫3省接壤,总面积1.2万km~2.邯郸地势自西向东呈阶梯状下降,高差悬殊,地貌类型复杂多样;西部为中、低山丘陵地貌,东部为华北平原;海拔最高1898.7 m,最低32.7 m;属温带半温润大陆性季风气候,四季分明.
脑血管疾病的危险因素及预防

脑血管疾病(CVD)是世界范围内人口死亡的第三位病因和成人致残的首要因素,同时也是老年人认知功能障碍和情感障碍的重要原因之一.我国为CVD高发国家,CVD年发病率为(185～219)/10万,估计每年有200万新发CVD病例,每年有150万人死于CVD,有CVD存活者700万人.
脑康注射液对大鼠脑缺血性损伤的作用

目的 观察脑康注射液对大鼠脑缺血性损伤作用的影响.方法 按不同剂量连续静脉及口服给药,分离两侧颈总动脉,双重结扎,测定脑缺血痉挛发作和死亡时间,用电磁流量计进行测量.结果 脑康注射液高、中剂量组对卒中型自发性高血压大鼠(SHRSP)脑缺血性损伤有防治作用,并能明显降低急性不完全性脑缺血大鼠的MDA含量,提高SOD活性.结论 脑康注射液能明显改善SHRSP大鼠脑缺血及急性实验性大鼠脑缺血,延缓SHRSP大鼠的死亡,改善自由基水平.
蜂胶总黄酮对衰老小鼠学习记忆的影响

目的 观察蜂胶总黄酮对D-半乳糖诱导衰老模型小鼠学习记忆的影响,并对其作用机制进行了探讨.方法 小鼠颈背部皮下注射D-半乳糖42 d,制备衰老模型.通过小鼠学习记忆能力、脑组织中超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、丙二醛(MDA)、脂褐素(LF)水平的测定,评价蜂胶总黄酮的抗衰老作用.结果 与空白对照组相比,D-半乳糖(150 g/kg,sc,42 d)使小鼠学习记忆能力降低,脑组织中SOD、GSH-Px活性下降,MDA、LF含量增加,而蜂胶总黄酮30 mg/kg、60 mg/kg和90 mg/kg三个剂量组对上述病理变化具有不同程度改善作用.结论 蜂胶总黄酮能改善D-半乳糖诱导衰老小鼠学习记忆功能障碍,其机制可能是抗氧化调节自由基代谢.
高尿酸血症对老年早期糖尿病肾病的影响

目的 探讨高尿酸血症对老年早期糖尿病肾病24 h尿白蛋白排泄率,血、尿β_2-微球蛋白的影响及其临床意义.方法 将大于60岁的早期糖尿病肾病的病例根据血尿酸水平分为早期糖尿病肾病合并高尿酸血症组(ADU组)和单纯糖尿病肾病组(ADN组),并设立非老年早期糖尿病肾病合并高尿酸血症组(DU组)以及老年健康对照组(AN组).测定所有病例尿白蛋白,尿β_2-微球蛋白以及血β_2-微球蛋白的水平,计算24 h尿白蛋白排泄率,并进行统计学分析.结果 尿白蛋白排泄率以及尿β_2-微球蛋白在ADU组高于ADN以及DU组.血β_2-微球蛋白在组间无显著性差异.老年早期糖尿病肾病患者血肌酐水平与血β_2-微球蛋白在组间无显著性差异.老年早期糖尿病肾病患者血尿酸水平与24 h尿白蛋白排泄率以及尿β_2-微球蛋白分别呈正相关.结论 高尿酸血症可以加重老年早期糖尿病肾病的肾小球及肾小管损伤.
西洋参叶20s-原人参二醇组皂苷对大鼠实验性心室重构的影响

目的 研究西洋参叶20s-原人参二醇组皂苷(PQDS)对大鼠急性心肌梗死晚期缺血再灌注后心室重构的影响及机制.方法 大鼠结扎左冠状动脉前降支2 h后,松扎再灌注28 d制备急性心肌梗死晚期缺血再灌注后心室重构模型,同时应用PQDS治疗,给药28 d后测定心室重构大鼠心脏形态学参数,血浆血管紧张素Ⅱ(ATⅡ)及内皮素(ET)水平.结果 与心室重构模型组比较,PQDS 50、100 mg·kg~(-1)·d~(-1)均能显著降低非梗死区室间隔厚度及左室腔面积/左室总面积比值(P<0.05及P<0.01),减少梗死区胶原沉积(P<0.05),降低非梗死区Ⅰ型及Ⅲ型胶原蛋白比值(P<0.05),并显著降低血浆ATⅡ及ET水平(P<0.05及P<0.01).两组间各项指标无显著差异. 结论 PQDS能够抑制大鼠实验性心肌梗死晚期缺血再灌注后的心室重构,其机制可能与降低血浆ATⅡ及ET水平,改善胶原重构相关.
DCM染料掺杂对有机电致发光磁效应的影响

制备了DCM染料掺杂的有机电致发光器件ITO/NPB/AIq3:DCM/Alq3/LiF/Al,研究了15 K～R.T.(室温)温度范围内,器件的电致发光随磁场的变化关系(即电致发光的磁效应).发现电致发光的磁效应由低场(0≤B≤40 mT)效应和高场(B≥40 mT)效应两部分组成.室温下,对于未掺杂的参考器件,发光在低场部分随磁场的增加迅速增强,高场部分随磁场的增加缓慢并逐渐趋于饱和.而对于掺杂器件,尽管发光在低场部分随磁场也迅速增强,但高场部分却在低场增加的基础上出现下降.器件的注入电流越大,发光在高场下降越明显.低温下(T≤150 K),尽管未掺杂器件电致发光的磁效应的高场部分也出现减弱趋势,但掺杂样品的高场部分受温度的影响要远弱于未掺杂样品的结果.基于掺杂引起的能级陷阱效应,通过讨论外磁场作用下的三重态激子淬灭过程,我们对实验结果进行了定性解释.
一种低群速度和低色散光子晶体波导结构及分析

研究了具有线状缺陷的三角晶格光子晶体波导中慢光的传播特性,设计了一种新的具有低群速度低色散的波导结构,并对其进行了数值模拟分析.通过增大光子晶体的空气柱半径及改变与波导相邻的第一排和第二排空气柱位置,可在一定的归一化带宽范围内保持较大群折射率的同时使群速度色散最小化,实现在一定波长范围内保持低群速度和低群速度色散,得到了较大的群折射率和归一化带宽的乘积.计算结果表明:当群折射率依次为85,58,45时,对应的归一化带宽分别为0.32%,0.48%,0.642%.
单侧椎间关节成形系统在腰椎间盘突出症手术中的初步应用

本文报告在腰椎间盘突出症手术中结合应用北京富乐医疗器械有限公司提供的"脊柱椎间关节动态微增量支撑椎弓根固定系统"行单侧双钉固定,共治疗9例病人,经初步观察,早期疗效满意.
两种岛状皮瓣修复拇指末节皮肤缺损疗效分析

[目的] 探讨示指背侧岛状皮瓣和拇指尺背侧岛状皮瓣修复拇指末节皮肤缺损的临床疗效.[方法] 2005 年1 月- 2008 年6 月,应用示指背侧顺行岛状皮瓣和拇指尺背侧岛状皮瓣修复拇指末节皮肤缺损48例,随机分为两组,其中示指背侧顺行岛状皮瓣组27例(指腹缺损17例、指端皮肤缺损4例、末节背侧皮肤缺损6例),拇指尺背侧岛状皮瓣组21例(指端皮肤缺损11例、指腹缺损6例、背侧皮肤缺损4例),术后对皮瓣的成活率、拇指的功能恢复、供区的影响进行了比较研究.[结果] 两组分别平均随访14.2、15.7个月,所有皮瓣全部成活,感觉恢复根据英国医学研究会评定标准,示指背侧岛状皮瓣组静态两点辨别觉为5～8mm;拇指尺背侧岛状皮瓣组静态两点辨别觉为6～10 mm,均达到S3+级以上,评分＞16.拇指指间关节活动与健侧比无明显差异.示指背侧岛状皮瓣修复拇指指端缺损的外形不如拇指尺背侧岛状皮瓣修复的效果好,且示指背侧供区游离植皮易于指背腱膜粘连,影响滑动,需术后配合功能练习和康复治疗.[结论] 示指背侧岛状皮瓣和拇指尺背侧岛状皮瓣血供安全、可靠,是修复拇指指背、指腹缺损的理想皮瓣,对于拇指指端缺损的修复,拇指尺背侧岛状皮瓣优于示指背侧岛状皮瓣,从对供区的影响角度看,拇指尺背侧皮瓣优于示指背侧岛状皮瓣.
超声引导下经颈内静脉淋巴结穿刺细胞学检查

近年来,超声引导下颈部淋巴结穿刺活检已发展成为一项非常重要的临床诊断方法,但颈部大血管旁淋巴结的手术活检及超声引导下穿刺活检仍需慎重.本文报道87例超声引导下经颈内静脉淋巴结细针穿刺细胞学检查结果.
A new superoxide-generation inhibitor from rhizome of Anemone raddeana Regel

A new triterpenoid saponins, raddeanoside R_(19) (1) was isolated from the rhizome of Anemone raddeana Regel. The effects of raddeanoside R_(19) on superoxide generation in human neutrophil were evaluated. The compound suppressed the superoxide generation induced by N-formyl-methionyl-leucyl-phenylalanine (fMLP), phorbol 12-myristate 13-acetate (PMA) and araehidonic acid (AA) in a different concentration-dependent manner.
A new method for preparing (2Z, 4Z, 6Z)-diethyl-4,5-oxepinedicarboxylates and some 1H-azepine analogues

A new method for preparing (2Z, 4Z, 6Z)-4,5-diethyloxepinodicarboxylate by one-step is described. The synthesis of several oxepines and azepines derivatives was carried out by the reaction of substituted furans or pyrroles with diethyl acetylenedicarboxylate in boiling toluene. The effect factors for this reaction were discussed and reaction condition was optimized.
LC/MS/MS法测定婴儿肾结石中三聚氰胺

三聚氰胺,又称蜜胺、2,4,6-三氨基-1,3,5-三嗪,白色单斜棱晶,微溶于水,可溶于甲醇、甲醛、乙酸、热乙二醇、甘油、吡啶等;遇强酸或强碱水溶液水解,氨基逐步被羟基取代,先生成三聚氰胺二酰胺,进一步水解生成三聚氰酸一酰胺,最后生成三聚氰酸[1].
松嫩盐碱草地土壤酶活性与肥力因子的典型相关分析

研究松嫩平原盐碱草地土壤酶活性与肥力因子的关系,结果表明:土壤过氧化氢酶、多酚氧化酶、过氧化物酶、蛋白酶、转化酶和碱性磷酸酶活性与土壤氮素、磷素、钾素、有机质、全盐含量及pH值之间的相关关系不同,酶活性在不同季节和肥力因子的相关性差异较大.将酶活性和肥力因子作为两组综合指标进行典型相关分析,得到3对显著典型变量,其中第1对典型变量的典型相关系数为0.967,特征值占总特征值的88.5%,且综合土壤肥力因子和综合酶活性因子典型变量排序图呈很好的线性特征,可以用综合酶活性来指示盐碱地肥力因子的变化.
玛曲高寒草地土壤养分对不同利用方式的响应

选取玛曲高寒围封草地(封育草地、修复草地)、开垦地(燕麦地)以及不同退化程度草地(中度退化草地、黑土滩草地、沙化草地),对土壤养分进行分析研究.结果表明:草地的开垦与退化,使土壤有机碳(SOC)、全N、有效N、全P、有效P含量显著下降,而pH值却显著升高.随着草地的开垦与退化,全K、有效K变化不明显,沙化草地土壤中全Ca含量显著增高,约是其它利用方式的3倍以上.中度退化草地的全Mg含量最高,燕麦地、封育草地也出现了较高的Mg含量,但无显著差异.各项养分指标之间存在一定相关性, 尤其是SOC与全N、有效N呈极显著正相关,与全P、有效P、全K、有效K、全Mg含量呈显著正相关,与全Ca含量呈显著负相关关系.土壤pH值与土壤全Ca含量呈显著正相关关系,而与土壤其他养分呈显著负相关关系.土壤全Ca与全Mg之间呈显著正相关.
黄花苜蓿种质发芽及早期生长对NaCl胁迫的响应

选取俄罗斯、蒙古国、中国3个地域的7份黄花苜蓿种质,比较其在不同浓度NaCl胁迫下(0.25%、0.50%、0.75%、 1.00%、1.25%、1.50%)发芽及早期幼苗生长特性.结果表明,随着NaCl浓度增加所有种质的发芽率、发芽速度及早期幼苗的胚根、胚轴长都显著降低;盐分解除后,未萌发的种子可迅速萌发,但种质间有差异;综合比较,俄罗斯的秋柳、雅酷、达菲耐盐性最强,蒙古国种质次之,我国的锡盟、呼盟、新疆种质对盐最敏感.
施氮水平对燕麦产量与养分吸收的影响

以青引1号燕麦为材料,研究了不同施氮水平对燕麦产量与养分吸收的影响.结果表明:施氮对燕麦的穗数、穗长、穗重、穗粒数、草产量和种子产量均有显著影响(P<0.05);氮肥用量为75kg/hm~2时,穗数、穗长、穗重、穗粒数、草产量和种子产量达最大值,分别为626.84个/m~2、17.54cm、2.95g/穗、31.31粒/穗、20.71×10~3kg/hm~2、6.49×10~3kg/hm~2;燕麦植株氮、磷、钾含量随生育进程呈下降趋势,同一生育期氮、磷、钾含量随施氮量的增加而增加;氮肥的农学效率、生理效率和当季回收率均随氮肥施用量的增加而下降.
MG132 Induced Apoptosis Pathway in HL-60 Cells and Impact of Allogeneic Mixed Lymphocyte Reaction

Objective: To investigate the proteasome inhibitor MG132-induced apoptosis pathway in HL-60 cells and the role of allogeneic mixed lymphocyte reaction.Methods: Cell apoptosis was analyzed by flow cytometry. The expressions of p21 protein, p27 protein and p53 protein in HL-60 cells treated with MG132 were measured by Western blot. The proliferation of, peripheral blood mononuclear cells (PBMNCs) after treatment with 75 Gy irradiated HL-60 cells treated with MG132 was measured with CCK-8.Results: High-dose MG132 induced apoptosis in HL-60 cells. No significant change was observed in MG132-induced apoptosis after inhibiting caspase-8 and caspase-9 pathway. The expressions of p21 protein and p27 protein increased in MG132-induced apoptosis. HL-60 cells treated with low-dose MG132 improved the proliferation of PBMNCs from healthy volunteers.Conclusion: High-dose MG132 induced apoptosis and directly killed HL-60 cells. MG132 induced apoptosis in a caspase-8- and caspase-9-independent pathway. p21 protein and p27 protein were involved in MG132-induced apoptosis in HL-60 cells. HL-60 cells treated with Low-dose MG132 improved the effect of promoting the proliferation of PBMNCs from healthy volunteers.
离心泵流场及动力特性研究

采用CFD软件在多参考坐标系下,利用有限体积法对雷诺时均N-S方程进行数值离散,选用标准κ-ε湍流模型与SIMPLEC方法求解,对某新型离心泵进行了叶轮蜗壳耦合三维定常湍流数值模拟,捕捉到了离心泵叶轮内的压力分布、速度分布等重要流动信息,计算了不同流量工况下水泵叶轮受力特性以及水泵能量和空化性能,并与试验方法进行对比,两者基本吻合,从而验证了计算结果的可靠性,为离心泵泵壳和叶轮的水力及优化设计等研究具有重要的指导意义.
烟草品种"红花大金元"变异株的快速繁殖技术

采用烟草"红花大金元"变异植株嫩叶为外植体,进行组培快繁体系研究,结果表明:最佳愈伤组织形成和再生芽萌生的培养基是:MS+6-BA 2.0mg/L+IAA 0.5mg/L+蔗糖20.0g/L;而MS+KT 0.3mg/L+NAA 0.2mg/L培养基对丛芽的增殖效果最佳;最佳生根培养基是1/2MS+6-BA 0.1mg/L+NAA 0.5mg/L,根多且壮.
烤烟叶片总多酚积累的位置差异分析

对3个品种不同部位的同一烤烟叶片上不同位置的总多酚积累的差异进行了系统的分析,旨在探明同一片烟叶的总多酚积累的变化与位置之间的关系.分析结果显示:3个品种不同部位同一烟叶总多酚的含量均存在叶尖＞叶中＞叶基的关系.同一部位同一烟叶不同位置的烟叶总多酚含量变化不同.在同一片烟叶中,红大品种和云烟品种烟叶总多酚含量积累的梯度差异变化均以中部叶的最高;K326品种烟叶的总多酚含量积累的梯度差异变化以下部叶的最高.分析结果表明:烤烟同一叶片总多酚的积累与叶片中不同位置田间形态受光机会呈正相关关系;不同品种均呈现相同规律,而且3个供试品种在相同环境中以红大品种总多酚积累最高,且梯度差异变化最大.这可能与红大烟叶品种特性有关,红大叶片节间较长,致使受光机会差异大,总多酚积累的位置差异变化显著.
基于搜索引擎的社会网络个体关系评估实现

通过调用Google Web API实现以人名为关键字的Web数据挖掘,利用Google搜索引擎的检索结果,结合Overlap度量系数评价个体间关系程度,完成了基于搜索引擎的社会网络个体关系评估实现,该方法可用于社会网络个体关系分析和已知社会网络个体关系扩展.
操作系统透明性研究

目前的操作系统存在很多问题,其中的一个原因是透明性不够,用户无法了解操作系统的运行细节,无法观察到操作系统的内部运行机制.Dtrace的推出使用户有可能对操作系统进行全面的观察,但Dtraee是一个专业化的工具,对使用者的要求较高,普通用户无法从中获益.文章提出了一种基于Dtrace的观察系统结构,使普通用户也可方便、直观地观察到操作系统的内部机制,从而提高操作系统的透明度.
应用Pi演算描述工作流高级模式

分析了对工作流进行形式化建模的意义,应用Pi演算对工作流高级模式进行了形式化描述.在深入研究工作流过程基本结构特征与Pi演算基本理论的基础上,提出了一种语义清晰的描述方法,该方法相比以前的方法可以更好地描述工作流的动态改变,为进一步形式化分析、描述工作流奠定了基础.最后以旅游预订业务系统为实例进行了业务过程建模.
X-CT投影数据硬化校正技术

从理论上探讨了广泛应用于各领域的CT系统中单能X光和多能X光与物质之间的作用机制,阐述了X射线能谱硬化的产生原因,而能谱硬化是造成图像伪影的重要因素,基于此结合现状分析讨论了消除射线硬化的几种关键技术.
关于RSA连分式攻击的一个注记

RSA是当前使用最为广泛的公钥密码算法之一.文章给出RSA连分式攻击的一种推广和应用,记(e,N)为RSA的公钥,其对应的私钥为d,若存在合适的整数k,使得e~k<Φ(N)和d~kmodΦ(N)
用超短冲头冲制电机仪表的小孔模

在电机、电器仪表冲制过程中,经常遇到孔径小于或等于料厚的孔的冲压工艺,亦常称小孔冲裁.小孔冲裁时,冲头除承受较大的压应力外,还由于截面尺寸小,抗弯断面惯性矩很小,而极易造成弯曲折断.因此小孔冲模设计时,冲头除选用高强度模具钢外,还必须采取措施提高冲头的刚性.为提高冲头的刚性,一般采用冲头加护套的结构.冲孔时整个冲头处于导向保护之中,从而提高了冲头的抗弯强度,延长了使用期,但是冲头护套结构复杂,精度要求高,装配困难.
Pernicious anemia: New insights from a gastroenterological point of view

Pernicious anemia (PA) is a macrocytic anemia that is caused by vitamin B_(12) deficiency, as a result of intrinsic factor deficiency. PA is associated with atrophic body gastritis (ABG), whose diagnosis is based on histological confirmation of gastric body atrophy. Serological markers that suggest oxyntic mucosa damage are increased fasting gastrin and decreased pepsinogen Ⅰ. Without performing Schilling's test,intrinsic factor deficiency may not be proven, and intrinsic factor and parietal cell antibodies are useful surrogate markers of PA, with 73% sensitivity and 100% specificity. PA is mainly considered a disease of the elderly, but younger patients represent about 15% of patients. PA patients may seek medical advice due to symptoms related to anemia, such as weakness and asthenia. Less commonly, the disease is suspected to be caused by dyspepsia. PA is frequently associated with autoimmune thyroid disease (40%) and other autoimmune disorders, such as diabetes mellitus (10%), as part of the autoimmune polyendocrine syndrome. PA is the end-stage of ABG. Longstanding Helicobacter pylori infection probably plays a role in many patients with PA, in whom the active infectious process has been gradually replaced by an autoimmune disease that terminates in a burned-out infection and the irreversible destruction of the gastric body mucosa. Human leucocyte antigen-DR genotypes suggest a role for genetic susceptibility in PA. PA patients should be managed by cobalamin replacement treatment and monitoring for onset of iron deficiency. Moreover, they should be advised about possible gastrointestinal long-term consequences, such as gastric cancer and carcinoids.
Diabetes mellitus as a risk factor for gastrointestinal cancer among American veterans

AIM: To assess the risk of biliary and pancreatic cancers in a large cohort of patients with type 2 diabetes mellitus (DM). METHODS: Eligibility for this study included patients with type 2 DM (ICD-9 code 250.0) who were discharged from Department of Veteran Affairs hospitals between 1990 and 2000. Non-matched control patients without DM were selected from the same patient treatment files during the same period. Demographic information included age, sex and race. Secondary diagnoses included known risk factors based on theirICD-9 codes. By multivariate logistic regression, the occurrence of biliary and pancreatic cancer was compared between case subjects with DM and controls without DM.RESULTS: A total of 1 172 496 case and control subjects were analyzed. The mean age for study and control respectively. The frequency of pancreatic cancer in subjects with DM was increased (0.9%) in comparison to control subjects (0.3%) with an OR of 3.22 (95% CI: 3.03-3.42). The incidence of gallbladder and extrahepatic biliary cancers was increased by twofold in diabetic patients when compared to controls. The OR and 95% CI were 2.20 (1.56-3.00) and 2.10 (1.61-2.53), respectively.CONCLUSION: Our study demonstrated that patients with DM have a threefold increased risk for developing pancreatic cancer and a twofold risk for developing biliary cancer.
Management of venous stenosis in living donor liver transplant recipients

AIM: To retrospectively evaluate the management and outcome of venous obstruction after living donor liver transplantation (LDLT).METHODS: From February 1999 to May 2009, 1 intraoperative hepatic vein (HV) tension induced HV obstruction and 5 postoperative HV anastomotic stenosis occurred in 6 adult male LDLT recipients. Postoperative portal vein (PV) anastomotic stenosis occurred in 1 pediatric left lobe LDLT. Patients ranged in age from 9 to 56 years (median, 44 years). An air balloon was used to correct the intraoperative HV tension. Emergent surgical reoperation, transjugular HV balloon dilatation with stent placement and transfemoral venous HV balloon dilatation was performed for HV stenosis on days 3, 15, 50, 55, and 270 after LDLT, respectively. Balloon dilatation followed with stent placement via superior mesenteric vein was performed for the pediatric PV stenosis 168 d after LDLT.RESULTS: The intraoperative HV tension was corrected with an air balloon. The recipient who underwent emergent reoperation for hepatic stenosis died of hemorrhagic shock and renal failure 2 d later. HV balloon dilatation via the transjugular and transfemoral venous approach was technically successful in all patients. The patient with early-onset HV stenosis receiving transjugular balloon dilatation and stent placement on the 15th postoperative day left hospital 1 wk later and disappeared, while the patient receiving the same interventional procedures on the 50th postoperative day died of graft failure and renal failure 2 wk later. Two patients with late-onset HV stenosis receiving balloon dilatation have survived for 8 and 4 mo without recurrent stenosis and ascites, respectively. Balloon dilatation and stent placement via the superior mesenteric venous approach was technically successful in the pediatric left lobe LDLT, and this patient has survived for 9 mo without recurrent PV stenosis and ascites.CONCLUSION: Intraoperative balloon placement, emergent reoperation, proper interventional balloon dilatation and stent placement can be effective as a way to manage hepatic and PV stenosis during and after LDLT.
Short-term Celecoxib intervention is a safe and effective chemopreventive for gastric carcinogenesis based on a Mongolian gerbil model

AIM: To evaluate the optimal intervention point of a selective cyclooxygenase-2 (COX-2) inhibitor, Celecoxib, for inhibiting Helicobacter pylori ( H pylori)-associated gastric carcinogenesis in Mongolian gerbils (MGs).METHODS: One hundred and twelve MGs were divided into six groups (A-F). One hundred gerbils were inoculated with H pylori (groups A-E). Twelve gerbils were inoculated with vehicle broth only (group F). After 4 wk, they were given N'-methyl-N'-nitro-N-nitroso-guanidine (MNNG) (50 mg/mL) in the drinking water for 20 wk. In groups B-E, the animals were given the stock Celecoxib (10 mg/kg per day) diet from the 21st, 31st, 21st and 41st week respectively. The periods of administering Celecoxib were 30, 20, 20, and 15 wk respectively. On the 51st week, the animals were sacrificed for histological examination. Local PCNA expression was examined by the immunohistochemistry method. The expression of COX-2 protein was assessed by Western Blot. Analysisused the χ~2 test. The difference was regarded as significant when P value was less than 0.05. RESULTS: Seventeen percent (17/100) of H pyloriinfected MGs developed gastric cancer. All of these lesions were well-differentiated adenocarcinoma. The incidence rates of adenocarcinoma in groups A-F were 40%, 0%, 0%, 20%, 25%, and 0% respectively. The inflammatory scores were higher in group B than in other groups. There was no inflammatory response noted in group F. Celecoxib treatment resulted in a significant reduction in the proliferation of H pyloriinfected mucosal cells (groups B, C and D) ( P < 0.01). The expression of COX-2 protein was significantly attenuated in the groups which were Celecoxib-treated for more than 20 wk (groups B, C, D). The groups treated with Celecoxib had a significantly lower rate of advanced gastric cancer (34% vs 75%, P < 0.001) There were no sudden deaths in any of the groups.CONCLUSION: Short-term treatment with Celecoxib has an anti-carcinogenic effect, and resulted in less severe inflammation and inhibited the invasive degree of gastric cancer.
Contribution from unresolved discrete sources to the extragalactic gamma-ray background (EGRB)

The origin of the extragalactic gamma-ray background (EGRB) is still an open question,even nearly forty years after its discovery.The emission could originate either from truly diffuse processes or from unresolved point sources.Although the majority of the 271 point sources detected by EGRET (Energetic Gamma Ray Experiment Telescope)are unidentified,of the identified sources,blazars are the dominant candidates.Therefore,unresolved blazars may be considered the main contributor to the EGRB,and many studies have been carried out to understand their distribution,evolution and contribution to the EGRB.Considering that γ-ray emission comes mostly from jets of blazars and that the jet emission decreases rapidly with increasing jet to line-of-sight angle,it is not surprising that EGRET was not able to detect many large inclination angle active galactic nuclei (AGNs).Though Fermi could only detect a few large inclination angle AGNs during the first three months of its survey,it is expected to detect many such sources in the near future.Since non-blazar AGNs are expected to have higher density as compared to blazars,these could also contribute significantly to the EGRB.In this paper,we discuss contributions from unresolved discrete sources including normal galaxies,starburst galaxies,blazars and off-axis AGNs to the EGRB.
半干旱区人工林地土壤入渗过程分析

森林是陆地生态系统最高大的植物群落,是维护陆地生态系统平衡的主要力量.穿过林冠到达地表面的雨水,要么通过空隙进入土壤形成土壤水,要么沿坡面流失形成地表径流.进入土壤的水分,或存储在土体内供植物吸收和利用,或在垂直入渗过程中改变方向形成壤中流,或穿过土层形成深层渗漏补给地下水.
八达岭森林土壤养分空间变异性研究

环境的变异性对于物种的分布是十分重要的,许多研究已经证明了环境的变异性和物种丰富度之间存在正相关的关系~([1,2]).在森林生态系统中,这个关系可以通过地下资源的变异性来解释说明.而土壤资源的空间变异性在个别尺度上很可能影响到该区域植被的分布、物种的丰富度和个别有机体的性能.
可变电荷土壤中胶粒双电层的相互作用与阴阳离子同时吸附

可变电荷土壤是在热带和亚热带地区母岩经历强烈的风化和淋溶作用形成的,或者由火山灰母质发育形成的土壤.这类土壤中硅酸盐矿物以高岭石为主,并含有大量Fe/Al氧化物.因此,这类土壤颗粒表面既带负电荷,又带有一定量的正电荷~([1]).Qafoku和Sumner~([2])研究发现带净负电荷的硅酸盐矿物颗粒和带正电荷的铁铝氧化物颗粒之间的相互作用是这类土壤能同时通过静电作用吸附阳离子和阴离子的主要原因.
肝与骨质疏松症关系探析

中医对骨质疏松症病因病机缺乏统一认识,总结各家观点,认为其病因病机与肝有重要联系,辨证治疗也多涉及到肝.该文就肝与骨质疏松症的关系从中医学与现代医学两方面进行探讨,为骨质疏松症的研究提供思路.
五味子水溶性多糖提取及纯化工艺的优化

目的 研究五味子多糖提取工艺参数及参数的评价方法.方法 用水提取醇沉法提取五味子多糖,通过单因素及正交实验,研究固液比、提取温度、提取时间及提取次数对五味子多糖得率的影响,并对多糖得率的质量评价和含量评价方法进行探讨,同时进行了多糖的纯化研究.结果 提取温度对五味子多糖得率的影响最大,固液比、提取时间对五味子多糖得率影响较小.通过测定提取的多糖含量计算五味子多糖得率与单纯用多糖质量(所得沉淀)计算的五味子多糖得率的比较存在一定的差异,表明采用含量测定的方法比单纯的质量比所确立的条件更准确.结论 五味子多糖提取的最佳工艺条件为:固液比1∶30,提取温度90℃,提取时间4 h,提取3次.用活性炭与Sevage法联合使用纯化多糖,使提取的多糖纯度由43.48%提高到66.43%.
<黄帝内经>对偶辞格研究

<内经>中存在大量的对偶句,且具有"不劳经营,率然对尔"的特点,<内经>中以"阴阳"为代表的对偶词也随处可见.归纳、分析<内经>的对偶辞格,探求其规律,对于准确理解原文、研究医理都具有重大意义.
建设有黄河特色的水文自动测报系统的探讨

本文简要分析了黄河流域独特的地理、水文特性,对黄河流域水文自动测报系统建设现状进行了初步分析,提出水文自动测报系统建设要根据黄河河情,配备满足黄河水文特性的数据采集传感器和通信组网方案,并对黄河流域自动测报系统建设进行了展望.
匙吻鲟仔稚鱼开口规格及摄食选择的研究

我国匙吻鲟(Polyodon spathula)仔稚鱼培育历史将近20年,目前成活率总体上还不高且有很大的波动性~([1-5]),与原产地美国本土相比有一定的差距,影响了我国匙吻鲟养殖业的发展.仔稚鱼培育是匙吻鲟养殖过程中非常重要的环节,Tania,et al.~([6])
人源化抗体的演进发展及应用现状

抗体的制备在经历了多克隆抗体、单克隆抗体后,进入了以人源化为目标的基因工程抗体阶段.嵌合抗体(chimericantibody)属于第一代人源化抗体,是应用DNA重组技术将鼠源性的可变区(V区)基因与人抗体的恒定区(C区)基因相连接构成嵌合基因的表达产物.在此基础上产生的第二代人源化抗体,即CDR移植抗体((2DR-grafted antibody),仅保留了3个CDR是鼠源性的,人源性可达90%以上.以上两者仍保留了鼠源性的成分,可诱发人抗鼠抗体(HAMA)反应.20世纪90年代以后产生的噬菌体抗体库技术,融合了噬菌体展示和抗体组合文库技术,突出了基因型与表型的统一,使抗体工程技术进入了一个新的发展阶段,全人源化抗体的生产和应用逐渐走向成熟.人源化抗体在肿瘤、器官移植排斥反应、自身免疫病等疾病的临床诊断和治疗中显示出了广阔的应用前景.
Th17细胞在自身免疫性疾病中的作用

一直以来人们认为Th细胞只有Th1和Th2两个亚群,然而最近人们又发现了一个具有与Th1和Th2细胞亚群不同分化机制和功能特性的新的Tb细胞亚群Th17.研究显示,Th17在多种疾病尤其是自身免疫性疾病中发挥着重要作用,因此Th17细胞的发现让我们不得不重新认识T细胞介导的免疫反应.
四川龙门山铜尾矿库植被调查及植被恢复的物种选择探讨

通过龙门山铜尾矿库土壤和植物重金属含量测定、植被调查、综合优势比分析,据此进行了该尾矿库植被恢复的植物群落重建方法的尝试.结果表明:尾矿土Cu、Pb、Zn含量分别为1 319、901、209 mg/kg;Cu超过植物生长临界值19.13倍,Pb超过14.48倍,Zn超过5倍.尾矿土重金属含量平均比附近的耕地高25.05倍,铜含量高32.05倍,过高的重金属含量是限制植物在尾矿地定居的主要因子.将该库91种植物分为5个相对稳定的群落类型:葫芦藓+地钱群落;艾蒿群落;白车轴草群落;芭茅+羊耳菊群落;羊耳菊+千里光+密蒙花群落.植物中早熟禾、狗牙根、翦股颖体内Cu和Pb含量均>100 mg/kg,为铜和铅的累积植物.最终筛选确定白车轴草、早熟禾、芭茅、棒头草、狗尾草、马桑作为植被重建的优良先锋物种.植物在纯尾沙上长势低弱,难以或不适应立地条件.经过覆盖耕地土处理效果明显好之,植物表现出对土壤条件的适应性;施肥对于生长在尾砂土上的植物作用微弱,却对覆盖耕地土上生长的植物产生了明显的成效.
双相不锈钢管板手工TIG填丝焊接工艺的研究

采用手工TIG填丝焊对双相不锈钢堆焊的管板与双相不锈钢管子接头处进行焊接,经检验表明:焊接件在渗透检验中没有出现宏观裂纹;显微组织观察发现铁素体与奥氏体两相比例符合技术指标要求;用扫描电镜进行线分析,发现两相中各元素分布在合理范围,焊接过程中元素烧损不严重;硬度值也在技术规定范围之内,没有出现淬硬现象.证明所选用的焊接工艺切实可行,对实际生产具有指导意义.
钢梁和钢混凝土组合梁在温度载荷作用下的响应

梁体在火作用下的响应取决于许多因素,包括约束条件和梁体的性质.应用温度升高时钢材和混凝土的非线性应力-应变关系,基于能量守恒原理,建立有限差分平衡方程,在合理确定钢材和混凝土热工参数基础上,分别分析三面受火、一面受力的两端为固定铰支座钢梁和钢混凝土组合梁的响应,得到2种约束梁体在温度载荷作用下响应的异同点,为进一步研究火灾下钢梁和钢混凝土结构的力学性能和抗火极限提供参考.
单体同位素分析在有机污染物研究中的应用进展

单体同位素分析(Compound-Specific Isotope Analysis, CSIA)是1990年代发展成熟的现代分析方法,日渐应用于环境分析领域,成为当前研究有机污染物最具有应用前景的技术之一.当前CSIA技术在有机污染物研究中的应用主要集中在污染物来源判识、生物转化及降解机理研究等方面,本文主要综述了CSIA在有机污染物生物转化的证明和转化机理研究方面的进展.
黄河水下三角洲表层粉土的冲切破坏与残留楔体研究

有桩靴的桩基在黄河三角洲海域表层硬粉土厚度＜3.5 m的区域插桩时,桩靴下部会形成残留楔体进入下卧软土层内,导致实际插桩深度比理论计算插桩深度少0.5～1.0 m.表层粉土冲切破坏形成弹性楔体,其厚度与桩靴宽度和地基土的内摩擦角有关.楔形体的产生可利用太沙基(K.Terzaghi)浅基础理论结合滑移线场理论解释.残留楔体的厚度受软黏土的厚度和抗剪强度控制.
栉孔扇贝血细胞活性检测方法的筛选与应用

筛选栉孔扇贝(Chalmys farreri)血细胞活性的检测方法,研究苯并[a]芘(B[α]P)对栉孔扇贝血细胞活性的影响.结果表明96孔培养板中栉孔扇贝血细胞接种密度在(1～32)×10~4 cell/孔时,血细胞活性无显著性差异(P>0.05),且细胞存活率在97.42%～98.82%之间,台盼蓝排斥法、四甲基偶氮唑(MTT)、二甲氧唑黄(XTT)比色法、乳酸脱氢酶(LDH)活性测定法均可作为栉孔扇贝血细胞活性的测定方法,而当血细胞接种密度在(12～32)×10~4/孔时,中性红比色法亦可作为血细胞活性的检测方法;同时实验采用Eagle培养液进行血细胞原代培养在0～24 h内血细胞活性较好.采用中性红比色法检测B[α]P对栉孔扇贝血细胞活性具有显著抑制作用,且抑制程度与B[α]P作用浓度、时间呈正相关,其余方法均未检测出B[α]P对血细胞活性的影响.由此可见,B[α]P对栉孔扇贝血细胞活性具有免疫毒性作用,中性红比色法可以作为评价B[α]P对栉孔扇贝血细胞免疫活性的敏感指标.
Born近似解与Mie散射解的分析比较

在遥感研究中,微分散射截面是1个重要的参数.针对相对折射率趋近于1的均匀球形粒子,在Born近似条件下求解出粒子的散射振幅函数和微分散射截面,通过与Mie散射理论结果的比较,对Born近似的适用范围进行了讨论,提出相对折射率处于[1.01,1.09]之间的散射粒子近似解适用的范围.
程序化设计的简并引物克隆半滑舌鳎CYP17基因

采用1种新的简并引物设计方法--CODEHOP法来克隆半滑舌鳎CYP17基因.该法结合NCBI、Blastp、BlockMaker、CODEHOP等生物信息学资源和DNAMAN、Oligo6.0等生物软件,程序性设计半滑舌鳎CYP17基因的CODEHOP引物,从半滑舌鳎卵巢组织中成功克隆了CYP17基因,该基因片段与其它物种的CYP17家族具有较高的同源性,经鉴定,该基因属于整个脊椎动物的CYP17基因群,尤其是鱼类亚群.实验结果表明,程序性设计的简并引物较传统简并引物特异性更高,假阳性率少,更有利于实验成功.
青岛一次局地大暴雨的中尺度环流特征分析

利用多普勒雷达、地面自动站、垂直风廓线及GPS 水汽分布等多种新型探测资料,对2008 年8 月14 日下午,奥帆赛期间发生在青岛地区的局地大暴雨天气的影响系统和中尺度强降雨形成的动力机理进行了综合分析,并通过0.5 km WRF模式的数值模拟给出了有地形阻挡情况下海风环流模型.研究结果表明:副高减弱东撤和弱冷空气南下在中低空形成闭合低涡是造成这次过程的主要天气尺度影响系统.海风中尺度辐合带上有风向切变辐合、大暴雨中心有明显的雷暴高压等中尺度天气系统.海风锋区辐合扰动向上传播,引发边界层扰动,是青岛局地大暴雨形成的主要抬升因素,而来自东南海洋上的暖湿平流为大暴雨的产生提供了充沛的水汽和能量.海风锋区辐合带上触发的强对流是大暴雨形成的直接原因;来自于海上的低空急流带来的大量水汽对强降雨的发生具有重要作用.海风在深入陆地后所发生的辐合和上升运动,对造成海风所触发的局地大暴雨有着极其重要的作用.
沉积物中天然气水合物合成及开采模拟实验研究

基于自行研发的天然气水合物模拟开采实验装置,进行了电加热法和减压法2种开采技术的实验研究.实验材料采用粒径为0.18～0.25 mm的自然砂,0.03%的十二烷基硫酸钠(SDS)水溶液和高纯甲烷,每次实验都分为水合物合成和开采两个阶段.实验结果表明:水合物首先在沉积物体系上层与外侧生成,然后在体系内部逐渐生成.在电加热法开采过程中,可分为初始分解、沉积物体系升温、大量分解3个阶段,加热点的位置、热量传递方向和速率决定着沉积物中水合物的分解位置和速率,该方法能量利用率较低.在减压法开采过程中,水合物分解速度先快后慢,设置的分解压力越低,分解速度越快.