mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Evidence for the Role of Transfer Cells in the Evolutionary Increase in Seed and Fiber Biomass Yield in Cotton

Transfer cells (TCs) are specialized cells exhibiting invaginated wall ingrowths (Wls), thereby amplifying their plasma membrane surface area (PMSA) and hence the capacity to transport nutrients. However, it remains unknown as to whether TCs play a role in biomass yield increase during evolution or domestication. Here, we examine this issue from a comparative evolutionary perspective. The cultivated tetraploid AD genome species of cotton and its A and D genome diploid progenitors displayed high, medium, and low seed and fiber biomass yield, respectively. In all three species, cells of the innermost layer of the seed coat juxtaposed to the filial tissues trans-differentiated to a TC morphology. Electron microscopic analyses revealed that these TCs are characterized by sequential formation of flange and reticulate WIs during the phase of rapid increase in seed biomass. Significantly, TCs from the tetraploid species developed substantially more flange and reticulate WIs and exhibited a higher degree of reticulate WI formation than their progenitors. Consequently, the estimated PMSA of TCs of the tetraploid species was about 4 and 70 times higher than that of TCs of the A and D genome progenitors, respectively, which correlates positively with seed and fiber biomass yield. Further, TCs with extensive WIs in the tetraploid species had much stronger expression of sucrose synthase, a key enzyme involved in TC WI formation and function, than those from the A and D progenitors. The analyses provide a set of novel evidence that the development of TC WIs may play an important role in the increase of seed and fiber biomass yield through polyploidization during evolution
Functional Characterization and RNAi-Mediated Suppression Reveals Roles for Hexose Transporters in Sugar Accumulation by Tomato Fruit

Hexoses accumulate to high concentrations (-200 mM) in storage parenchyma cells of tomato fruit. Hexoses are sourced from the fruit apoplasm as hydrolysis products of phloem-imported sucrose. Three hexose transporters (LeHT1, LeHT2, LeHT3), expressed in fruit storage parenchyma cells, may contribute to hexose uptake by these cells. An analysis of their full-length sequences demonstrated that all three transporters belong to the STP sub-family of monosaccharide transporters that localize to plasma membranes. Heterologous expression of LeHT1 (and previously LeHT2, Gear et al., 2000), but not LeHT3, rescued a hexose transport-impaired yeast mutant when raised on glucose or fructose as the sole carbon source. Biochemically, LeHT1, similarly to LeHT2, exhibited transport properties consistent with'a highaffinity glucose/H~+ symporter. Significantly, LeHT1 and LeHT2 also functioned as low-affinity fructose/H~+ symporters with apparent K_m values commensurate with those of fruit tissues. A substantial reduction (80-90%) in fruit expression levels of all LeHT genes by RNAi-mediated knockdown caused a 55% decrease in fruit hexose accumulation. In contrast, photoassimilate production by source leaves and phloem transport capacity to fruit were unaffected by transporter knockdown. Collectively, these findings demonstrate that LeHTs play key roles in driving accumulation of hexoses into storage parenchyma cells during tomato fruit development
组织构建研究:生物力学环境与生物反应器

文章导语:○如何定义硬组织和软组织?○应力作用与细胞生长的关系?○骨性愈合中形成起决定性作用的是什么?○软组织由哪些特定功能的细胞构成?○应力对细胞功能的影响取决于哪些因素○应力产生的应变可分为几种形式?○应力对细胞的作用方向?○压应力生物器的压力作用方式
A simple hydrothermal route to fabrication of singlecrystalline silver nanoplates using poly(vinyl pyrrolidone)

Single-crystalline silver nanoplates with an average in-plane dimension and thickness of about 700 and 25 nm, respectively, were fabricated on a large scale in aqueous poly(vinyl pyrrolidone)/AgNO_3 solution by a simple one-step hydrothermal method. In this process, poly (vinyl pyrrolidone) (PVP) acts as both reducing agent and shape-directing agent. SAED and XRD measurements reveal that the growth of silver nanoplates is mainly dominated by (111) facets
Drug release behaviors of a pH/temperature sensitive core-shelled bead with alginate and poly(N-acryloyl glycinates)

In this study, a pH/temperature sensitive bead with core-shelled structure, as a drug carrier, was prepared by grafting of N-acryloylglycinates on the surface of sodium alginate beads. The pH and temperature sensitivity of the beads originate from sodium alginate (SA) and copoly(N-acryloylglycinates), respectively. Here, indomethacin (IMC) was selected as a drug model molecule and loaded in SA beads. The release of IMC was systematically investigated as a function of temperature, pH, and SA concentration. The amount of IMC released from beads was as high as 61.6% in pH = 7.4 phosphate buffer solution (PBS) over 620 min, whereas only 27.9% IMC diffused into the pH = 2.1 PBS. In addition, the release rates of IMC at 37.5± were faster than that at 20.0± and decreased with increasing SA concentration in the beads. The result indicates that the sensitive beads have the potential to be used as an effective pH/temperature-controlled delivery system in the biomedical fields
Neural stem cell transplantation in the hippocampus of rats with cerebral ischemia/reperfusion injury Activation of the phosphatidylinositol-3 kinase/Akt pathway and increased brain-derived neurotrophic factor expression

The phosphatidylinositol-3 kinase (PI3K)/Akt pathway and brain-derived neurotrophic factor (BDNF) are involved in neurological functional recovery following cerebral ischemia. Therefore, we hypothesized that mechanisms of neuroprotection by transplantation of neural stem cells (NSCs) on cerebral ischemia contributed to activation of the PI3K/Akt pathway and enhanced BDNF expression. In the present study, Wortmannin (a specific, covalent inhibitor of P13K) was administered adjacent to ischemic hippocampus by stereotactic transplantation to further confirm the neuroprotective mechanisms of NSC transplantation following cerebral ischemia. Results showed that focal infarct volume was significantly smaller in the NSCs group, but the neurological behavior score in the NSC group was significantly greater than the middle cerebral artery occlusion model group, Wortmannin treatment group, and NSCs + Wortmannin treatment group. Protein expression of BDNF was significantly greater in the NSC group compared with the Wortmannin treatment group and NSCs + Wortmannin treatment group. These results suggest that the neuroprotective role of NSC transplantation in the cerebral ischemia activated the PI3K/Akt pathway and upregulated BDNF expression in lesioned brains
Fabrication and enhanced optical absorption of submicrometer pits array on 6H-SiC via two-beam interference of femtosecond laser

We report the fabrication of submicrometer pits array (SP-array) on 6H-SiC surface by the interference of two femtosecond laser beams. Formation mechanisms and optical absorption of SP-array are studied. The relative reflectivity and transmissivity of white light decrease to 10% of the values of SiC crystal, and the optical absorption is enhanced to 97%. The relative reflectivity and transmissivity of incident angles within the range of 20**-60** are kept below25%. The enhancement mechanism of optical absorption of the SP-array is also discussed
地学和遥感领域的一次盛会——"第十届国际地学与遥感会议(IGARSS)"在美国夏威夷召开

由世界上最大的专业学术组织IEEE(Institute of Electrical and ElectronicsEngineers美国电气及电子工程师学会)和其下属的GRSS(Geoscience and Remote Sensing Society地学与遥感委员会)联合发起组织并受到日本宇宙航空研究开发机构(JAXA),美国太空总署(NASA)和保卫世界基金会(SWF)资助的"第十届国际地学与遥感会议(IGARSS)"于2010年7月25-30日在美国夏威夷火奴鲁鲁市举行
关注转化医学 深化烧伤临床营养研究

当今生命科学日新月异, 在发展越来越细、越来越深的同时与临床的距离却越来越远. 生命科学的成果没有及时应用于临床治疗, 没有体现其核心价值和终级目标. 这不得不促使人们思考如何打破基础研究与临床攻池间的屏障, 缩短从实验室到临床的距离, 及时将基础研究成果转化为临床治疗的新技术、新方法, 推动临床医学快速发展, 使患者的真正从科技进步中获益. "转化医学(translational medicine)"正是在这种背景下产生的
负压封闭引流技术结合游离植皮治疗16例患者深度烧伤感染创面

植皮术后皮片坏死的原因主要有局部感染、血肿及固定不当等. 感染创面植皮术后发生感染的可能性比一般创面大, 如术区是不易包扎固定的部位, 术后皮片坏死的风险进一步增加. 游离植皮结合VSD修复深度烧伤感染创面, 其植皮成活率提高可能与下列因素有关: (1)VSD能及时引流, 利于控制感染~[1]. VSD能将植皮区创面局部的渗血及分泌物及时吸出, 避免皮下血肿的发生, 减少细菌繁殖的可能进而有效控制感染. 另外透明贴膜完全封闭创面, 阻止外来菌入侵, 减少创面感染. (2)VSD操作简便, 形状规则的小创面边缘可以不用缝合, 透明贴膜能较好地固定泡沫材料. 全方位的均匀负压, 使游离皮片与创面均匀接触, 避免了打包包扎压力不均的弊端, 从而提高了皮片成活率. (3) VSD可改善血运, 有利于创面愈合. 研究表明, 创面VSD治疗可以促进局部内皮细胞分化、诱导血管再生, 改善局部血运~[2]. 良好的血运利于创面愈合, 并为皮片的成活打下良好基础. 应用游离植皮结合VSD治疗深度烧伤感染创面, 能防止术区感染进一步加重, 并能在不易包扎的部位妥善固定皮片, 从而提高移植皮片的成活率
智能空间中基于Agent技术的资源约束研究

在智能空间中系统资源是有限性的.为了使资源有效利用,本文对于多Agent系统的预测问题提出NNL学习框架,使每一用户在资源使用方面达到一个比较满意的结果,也就是达到一个均衡的效果,这个算法也为环境的调节提供了基础
浅谈B2C网上支付系统的构建

随着人们生活水平的不断提高,人们的消费观念也在不断的改变,人们不再满足于过去在购物场所购买商品,的是希望坐在家里就可以购买到自己想要的商品.伴随着网络领域的不断发展,人们的想法终于在电子商务上得到了实现,而B2C模式是我国最早产生的电子商务模式,但是如何做到B2C网上支付呢,就此在这篇文章中进行了系统的研究与论述
Removal of Volatile Organic Compounds (VOCs) Mixture by Multi-Pin-Mesh Corona Discharge Combined with Pulsed High-Voltage

Removal of single component and binary mixtures of benzene and m-xylene using a multi-pin-mesh reactor was studied to find the decomposition characteristics, carbon balance and C0_2 selectivity. The decomposition rate of benzene in mixture was approximately 16% lower than that of single component benzene. However, the decomposition rate of m-xylene in mixture was slightly higher than that of single component m-xylene. Carbon balance of the mixture decomposition process achieved a lower level than that of single component benzene/m-xylene. Increase in the specific input energy was helpful to improve CO_2 selectivity in the single component decomposition process, while the specific input energy had a negligible effect on CO_2 selectivity in the mixture decomposition process. By changing the oxygen content in background gas, we found that different types of radicals showed different reaction activities toward benzene and m-xylene. Benzene was more likely to react with nitrogen-containing radicals, while m-xylene was more likely to react with oxygen-containing radicals
基于Matlab的DSP信号采集系统的总体设计

本文介绍了一套基于Matlab的DSP信号采集与处理系统.从系统性能上看,本系统能够精确分析基频整数倍的信号的频率和幅值.从整体上看,从前端的信号调理,滤波到A/D采集到信号的算法处理,再到最后通过液晶屏显示处理结果,整个系统实现了数字信号处理的流程.用户可以在Matlab中调用这些图形化功能模块及在Simulik的其他模块中建立数字信号处理模型,并可对模型进行仿真验证,然后生成TMS320C2000C语言代码及CCS工程项目文件,在CCS中经修改,编译后就可以下载到DSP目标板中运行
城轨车辆转向架虚拟检修系统的研究与开发

围绕城轨车辆转向架检修,综合考虑转向架的结构特点和检修基地真实检修工艺,将转向架三维建模,虚拟场景建立,人机交互技术结合起来设计出一套用于城轨交通学员进行培训的转向架虚拟检修教学系统.利用Pro/E建立转向架三维模型,VC++2005,OSG以及QT建立检修系统的虚拟现实环境,利用SketchUp对转向架检修车间建模,导入系统营造真实检修环境,实现了用户与虚拟设备利用鼠标和键盘进行交互的功能.并基于以上技术完成了沈阳地铁车辆中CCDZ50型转向架的检修仿真,系统将应用于沈阳某铁路职业学校和沈阳地铁检修工人的教育培训,所取得的成果具有推广价值
级联型高压变频器控制研究

本文介绍了级联型高压变频器的拓扑结构和多载波控制算法,从理论上分析了载波移相式算法具有的优点.针对在实际设计多载波算法时存在的困难,给出了错位移相式算法的一种基于DSP和FPGA控制器的实现方法.试验结果表明,级联型错位移相式变频器的输出相电压和线电压的阶梯数目较多,波形非常接近正弦波,且电压的变化率小,进而证明了本文方法的可行性
一种新的面向无线传感网的低耗分簇算法

近年来,传感器网络各个等领域均表现出着非常广泛的应用前景,也因而受到了军队,学术界和工业界的高度关注.本文提出了一种新的分簇算法NECA,使算法在节点平均能量消耗,网络生存时间等指标上相对现有协议有明显的提升,并且对于不同的规模与部署密度的网络有着很好的适应性.供大家探讨研究
真空泵状态监测方法及监测系统研究

水环式真空泵是选矿厂的关键设备,其正常运行与否直接关系到整个选矿生产线的运行.采用先进的信号处理技术对真空泵关键设备进行诊断.除了采用传统的时域,频域处理技术以外,引入解调技术,小波分析等方法对设备进行准确诊断,对于今后真空泵状态监测技术发展具有一定帮助
Transarterial embolization ablation of hepatocellular carcinoma with a lipiodol-ethanol mixture

AIM:To determine the safety and effectiveness of transarterial embolization ablation(TEA)of hepatocellular carcinoma(HCC)with a lipiodol-ethanol mixture. METHODS:Between January 1 and December 31, 2009,15 patients with HCC(13 men/two women,aged 38-75 years)accepted TEA treatment and were enrolled in this study,including five newly diagnosed patients and 10 with refractory disease.Two months after TEA, angiography and contrast computed tomography(CT) were performed,and responses were assessed using a modified version of Response Evaluation Criteria in Solid Tumors(RECIST version 1.1).The follow-up period was to June 30,2010. RESULTS:Every new case was treated once.Angiography was performed immediately after TEA,and showed that the tumor-feeding vessels were completely embolized and that lipiodol was densely deposited inside tumors.Two months after treatment,contrast CT showed no enhanced lesions.Alpha fetoprotein levels returned to normal in four patients and markedly decreased in another.mean±SD survival after treatment was 10.8 ±4.5 mo.All five patients survived during the follow-up period.Ten patients with refractory disease were treated a total of 14 times.Angiography immediately after TEA showed that blood flow to the tumors was obviously decreased in all cases,and contrast CT showed obvious depositions of lipiodol.Two months after treatment,the tumors had shrunk(6/10)or were stable(3/10).One had progressed after 2 mo and died of tumor rupture 3 mo after TEA.mean±SD survival after treatment was 8.6±4.3 mo;two patients survived during the follow-up period.Adverse effects included reversible hepatic decompensation,upper abdominal pain,and fever. CONCLUSION:TEA is an effective therapy for patients with HCC and might be more effective than transcather arterial chemoembolization for treating refractory disease
卡维地洛对培养心肌细胞氧化损伤的保护作用

目的:探讨卡维地洛对培养心肌细胞氧化损伤的保护作用和机制.方法:H2O2作用于体外培养的新生SD大鼠心肌细胞,建立心肌细胞氧化损伤模型.用卡维地洛预处理后,镜下观察心肌细胞测定心肌细胞存活率(MTT比色法),丙二醛(MDA),型谷胱甘肽(GSH),氧化型谷胱甘肽(GSSG)等指标水平.结果:卡维地洛干预后提高心肌细胞氧化损伤的细胞存活率(P<0.01),减少MDA,GSG生成以及提高GSH的生成(P<0.01).结论:卡维地洛通过抗氧化作用对心肌细胞氧化损伤起保护作用
血清多项细胞因子检测在单纯病毒性角膜炎诊断中的意义

目的:探讨血清IL-2,IL-6和IFN-γ细胞因子检测在单纯病毒性角膜炎诊断中的意义.方法:分别检测HSK患者和健康对照者血清中IL-2,IL-6和IFN-γ水平,比较各组间IL-2,IL-6和IFN-γ水平变化.结果:HSK组IL-2水平明显低于对照组,IFN-γ水平明显高于对照组,差异均有统计学意义(P<0.05).而两组IL-6水平比较无统计学意义(P>0.05).HSK复发组IL-2水平明显低于初发组,IFN-γ水平明显高于初发组,差异均有统计学意义(P<0.05).而初发组与复发组间IL-6水平比较,差异无统计学意义.结论:HSK患者IL-2水平明显降低,而IFN-γ水平明显升高,并且在复发组和初发组间存在统计学差异,IL-2和FN-γ水平检测有助于对HSK的诊断
应关注对强直性脊柱炎骨损伤的认识

强直性脊柱炎(ankylosing spondylitis,AS)以脊柱及骶髂关节的炎症、骨侵蚀及新骨形成为特点,它的结构性破坏与其他风湿病的关节炎不同.AS患者的病变部位是如何从炎症发展到关节强直的? AS的关节强直是否可以被阻止或预防? 这是2010年7月 9日至10日在广州召开的"AS国际论坛(中国)"会议上,由国际著名的风湿病专家(德国)Joachim Sieper教授给本次会议设定的主题,也是近年来国内外风湿科临床医师最关心的问题之一.我们应关注AS骨损伤的研究
利多卡因对依托咪酯全麻诱导时静脉注射痛和术后静脉炎的影响

目的:观察全麻诱导时应用利多卡因对依托咪酯引起的注射痛及术后静脉炎的影响. 方法:200例食管癌患者随机分为利多卡因(L)组和对照(C)组,每组各100例. 分别观察两组麻醉诱导时静脉注射痛发生率和术后5天内静脉炎发生率及程度,记录麻醉诱导前(To)、气管插管前(T,)、气管插管即刻(T2)患者平均动脉压(MAP)和心率(HR),观察两组术毕至气管拔管时间. 结果:两组气管插管前MAP小幅下降,HR减慢(P<0.01),气管插管即刻,L组MAP、HR变化均较C组缓和,差异有统计学意义(p<0.01). 两组气管拔管时间相比无明显差异(P>0.05). L组诱导时注射痛发生率和术后静脉炎发生率及评分均显著降低C组(P<0.01). 结论:全麻诱导时,利多卡因与依托咪酯同时注射可以降低依托咪酯注射痛发生率和术后静脉炎发生率及程度,并且可以减轻插管反应,而不影响患者术毕苏醒
Highly Stable CdSe/CdS/ZnS Fluorophores in Acidic Environment:Acile Preparation and Modification of Core/shell/shell Nanocrystals

We described a facile method for preparing CdSe/CdS/ZnS core/shell/shell nanocrystals from air-stable single source precursors.The single source precursors of cadmium ethylxanthate and zinc ethylxanthate were used to form CdS and ZnS shell layers in octadecene.An efficient modification of CdSe/CdS/ZnS nanocrystals was subsequently performed to obtain hydrophilic nanocrystal fluorophores with good stability in a pH range of 1.6--10
Performance and Kinetics Studies on Selective Catalytic Reduction of NO_x with NH_3 over MnO_x-WO_3/TiO_2 Catalyst

The catalytic activities of MnO_x-WO_3/TiO_2 for selective catalytic reduction(SCR)of NO with NH3 were investigated in a wide range of temperature and reaction condition.It yielded a NOx conversion of 80.3%--99.6%and a N_2 product selectivity of 100%--98.7%during 100℃ to 350℃ at gas hourly space velocity(GHSV)=18900 h~(-1).In the presence of 0.01%SO_2 and 6%H_2O at 120℃,the NO_x conversion can maintain 98.5%.At 300°C and with 0.07%SO_2 in reactant stream,the NO_x conversion stabilized at 99%as high as the commercial V-W/TiO2 catalyst's level.The steady-state kinetics study shows that O_2 played a promoting role.In the presence of less than 1.5% O_2, NO_x conversion can increase sharply with the increase of O_2 concentration.The reaction order was zero with respect to NH_3 and first with respect to NO with excess O_2 and H_2O.The kinetics active energy(E_a)of Mn-W/TiO_2 was calculated to be 6.24 kJ/mol according to the kinetic experiment at various temperatures,much lower than those of other catalysts reported in the literature.Mn-W/TiO2 is an excellent catalyst for SCR of NO with NH_3 by now
应用高敏感C-反应蛋白试剂检测发热期患儿血清CRP值

C-反应蛋白(CRP)即环状五球体蛋白,是炎性因子刺激人体肝脏与上皮细胞后合成,健康人血液中C-反应蛋白浓度很低,当细菌感染人体某组织或器官引发炎症反应达612 h时,使用C-反应蛋白试剂检测患儿末梢血,即可测得血清中CRP值
根除幽门螺杆菌与纠正不良生活习惯在治疗消化性溃疡中的作用

消化性溃疡(PU)是一种很容易频繁复发的消化系统疾病.过去用抑酸剂治疗后愈合的溃疡,停药后溃疡的年复发率为50%70%.近年来,我科采用三联疗法(奥美拉唑+阿莫西林+左氧氟沙星)根除幽门螺杆菌(Hp)感染,而且纠正患者的不良生活习惯(如戒烟酒,少量多餐,避免辛辣过咸食物,不饮浓茶及咖啡,避免过度劳累和精神紧张,避免服用非甾体抗炎药及糖皮质类激素药物)等预防措施,从而明显降低了消化性溃疡的复发率,使绝大多数消化性溃疡患者得到彻底治愈.现将A组(根除Hp+奥美拉唑+前述纠正患者的不良生活习惯)和B组(根除Hp+奥美拉唑)以及C组(单用奥美拉唑)3种方法治疗消化性溃疡的治愈率及复发率进行对比分析
胎儿遗传特征与产前诊断

基因是遗传信息的载体和遗传物质的最小功能单位, 其中蕴含着人类所有的遗传密码乃至人的生、老、病、死之谜; 自受精卵形成开始, 不同的基因组合形成了不同的基因型, 也就形成了每个胚胎或胎儿不同的遗传特征, 包括基因异常所导致的一些遗传性疾病和先天性畸形, 如地中海贫血、胎儿及新生儿溶血性疾病、杜氏肌营养不良、21-三体等疾病. 利用当前先进的技术, 产前诊断能在细胞、分子和生物化学上对胎儿来源的染色体和基因进行遗传学分析, 其结果是诊断胎儿遗传性疾病的金标准; 据英国研究所(UK service laboratories)统计, 在2008 - 2009年间英国有1571.种分子产前诊断方法对135种疾病进行诊断(除外非整倍体和.RHD血型筛查), 而1993 - 1994年间只有640种方法, 这对产前遗传疾病的诊出无疑是一个巨大的进步~[1]
福莱导尿管在孔源性视网膜脱离手术中的应用研究

封闭视网膜裂孔是孔源性视网膜脱离手术的关键,硅胶块或硅胶海绵顶压裂孔是目前基本手术方式.但此手术方式手术中需做巩膜缝线,有缝穿球壁的风险,并且硅胶块或硅胶海绵长期留置增加了感染及复视的发生机率.另外,由于外加压物的存在可产生周围瘢痕增生等异物反应,如果局部加压过紧,可致巩膜变薄,组织缺血等~[1].鉴于这些问题, Kressing和 Lincoff~[2]曾将暂时性Lincoff-Kressing球囊应用于视网膜脱离外加压手术中,但因其价格昂贵,临床难以普及.为此,我们分别采用福莱导尿管(Foley导尿管)的水囊与硅胶块或硅胶海绵顶压视网膜裂孔,对比观察2组的治疗效果.现将结果报道如下
巨噬细胞与小胶质细胞在老年性黄斑变性发病机制中的调控作用

巨噬细胞和小胶质细胞作为视网膜主要的2种免疫系统的重要细胞,对老年性黄斑变性 (AMD)的发病具有多重综合调控作用.然而在AMD不同阶段、不同亚型中,2种细胞可以是促炎症或促血管生成、致免疫或免疫耐受、组织损害或组织保护.2种细胞在AMD发病机制中的具体作用机制通路、功能状态与AMD的关系等仍需进一步阐述.巨噬细胞的定向诱导和对其功能的精确调控,是今后该研究领域的热点问题,随着研究的不断深入,有可能成为日后治疗AMD,尤其是渗出型AMD的一种有效的新方法
A 10kW-scale Distributed Power Plant of Natural Gas-Proton Exchange Membrane Fuel Cell

A 10 kW-scale natural gas fueled proton exchange membrane fuel cell(PEMFC)distributed power plant is presented in this paper,which is designed for cogeneration of power and heat.With homemade catalysts for CO removal in a two-stage methanation process and integrated reactor in the fuel processing system,the reformed fuel with CO molar fraction less than 10-5is obtained for the fuel cell stack.Based on Matlab/Simulink/Stateflow and xPC Target platform,a rapid control prototype(RCP)is developed for real-time condition management,signal tracking and parameter tuning,data storing,and man-machine interaction.In a typical running with 4.3 kW stack power,the hydrogen production efficiency,gross power generation efficiency and heat recovery efficiency approach to 76%,41%and 50%,respectively.The peak stack power reaches 7.3 kW.Though there is still considerable distance to long-term operation at 10 kW-scale net power generation,it is a milestone for the PEMFC-based stationary application in China
Vapour-Liquid Equilibrium with a New Ebulliometer:Ester+Alcohol System at 0.5 MPa

A new dynamic ebulliometer is used to determine vapor-liquid equilibrium(VLE)data experimentally. In the equipment,both phases are recirculated.Its operation is a consequence of the Cotrell pump effect produced when the mixture is heated in a double-walled inverted vessel.The reliability of the apparatus is tested with the mixtures studied previously by various authors.VLE data for the binary systems of methyl acetate+methanol and the methyl acetate+ethanol at 0.5 MPa are determined.The experimental data are confirmed with the point-to-point test of van Ness,applying the Fortran program of Frendslund et al.In addition,the experimental results are compared with the UNIFAC(including different versions)and ASOG prediction models
Biodegradation Kinetics for Pre-treatment of Klebsiella pneumoniae Waste with Autothermal Thermophilic Aerobic Digestion

Biodegradation parameters and kinetic characteristics for pre-treating waste strains of Klebsiella pneumoniae were studied in laboratory scale with an insulated reactor by an innovative technique,autothermal thermophilic aerobic digestion(ATAD).Based on an Arrhenius-type equation,an empirical model was developed to correlate the removal of total suspended solid(TSS)with the initial TSS concentration,influent reaction temperature, aeration rate and stirring rate.The reaction temperatures of the ATAD system could be raised from the ambient temperatures of 25°C to a maximum temperature of 65°C.The exponentials for the initial TSS concentration, aeration rate and stirring rate were 1.579,-0.8175 and -0.6549,respectively,and the apparent activation energy was 6.8774 kJ·mol~(-1).The correlation coefficient for the pre-exponential factor was 0.9223.The TSS removal efficiency predicted by the model was validated with an actual test,showing a maximum relative deviation of 10.79%. The new model has a good practicability
超声在发育性髋关节异常早期筛查中的临床意义

发育性髋关节异常(developmental dysplasia of the hip, DDH)是指发生在出生前及出生后股骨头和髋臼在发育成熟和解剖关系中出现异常的一系列髋关节病症,早期在临床上多表现为髋关节不稳定,晚期可以表现为髋关节不同程度的脱位或发育不良,也可导致成人期严重丧失关节功能的髋关节脱位病变
Improved clustering method based on artificial immune

An improved clustering method based on artificial immune is proposed.To obtain the better initial solution,the initial antibody network is introduced by self organizing map(SOM) method.In the process of the clustering iteration,a series of optimization and evolution strategies are designed,such as clustering satisfaction,the threshold design of scale compression,the learning rate,the clustering monitoring points and the clustering evaluations indexes.These strategies can make the clustering thresholds be quantified and reduce the operator's subjective factors.Thus,the local optimal and the global optimal clustering simultaneously are proposed by the synthesized function of these strategies.Finally,the experiment and the comparisons demonstrate the proposed method effectiveness
RV constraint based FIB design for wideband linear array

Frequency-invariant beamformer(FIB)design is a key issue in wideband array signal processing.To use commonly wideband linear array with tapped delay line(TDL)structure and complex weights,the FIB design is provided according to the rule of minimizing the sidelobe level of the beampattern at the reference frequency while keeping the distortionless response constraint in the mainlobe direction at the reference frequency,the norm constraint of the weight vector and the amplitude constraint of the averaged spatial response variation(SRV).This kind of beamformer design problem can be solved with the interior-point method after being converted to the form of standard second order cone programming(SOCP).The computer simulations are presented which illustrate the effectiveness of our FIB design method for the wideband linear array with TDL structure and complex weights
浙江省绍兴市病媒生物监测分析

为及时掌握绍兴市病媒生物的种群分布,密度和季节消长情况,了解病媒生物在不同行业,不同场所的侵害状况,科学开展病媒生物防制工作,根据《全国病媒生物监测方案》[1],《浙江省病媒生物监测方案》的有关要求,我们于2008年在绍兴市区开展了病媒生物监测,现将结果报告如下
从急性肾衰竭到急性肾损伤

AKI在ICU中最常见,肾功能轻微改变就可影响住院患者短期和长期预后,从ARF到AKI称谓的变化,反映了人们对其认识的改变,它像全身性感染、急性肺损伤/急性呼吸窘迫综合征(ALI/ARDS) -样,从危险因素到损伤,从损伤到衰竭或恢复,有着一个明确的由轻到重的病理生理过程.若能早期诊断和干预,特别是发现开始肾脏替代治疗的早期指标,将有助于提高AKI患者的生存率.RIFLE和 AKIN的分级诊断方法为我们提供了ARF相对统一的诊断标准.研究显示,RIFLE的分级与患者疾病的严重程度、肾脏替代治疗比例和患者的病死率有良好的相关性,这为今后的临床工作和科学研究奠定了基础.但是新的诊断标准仍存在一些问题,SCr和尿量受多种因素的影响,特别是ICU的危重症患者,如营养状况、肝功能、血容量和使用利尿剂等.使用某些公式,如用改良的肾脏疾病饮食(MDRD)计算患者既往SCr值与实测值会有明显的差异,这样就无法准确计算 SCr升高的绝对值和比例[19].因此,单纯依靠SCr和尿量作为判断肾功能或GFR的状况是无法对AKI进行早期诊断的,需要寻找更为敏感的生物学标志物.目前在我国尚未形成统一的AKI临床诊断标准,这需要多学科间的积极合作,尽快建立与国际接轨的诊断标准,必将大大提高AKI的诊断与治疗水平
微卫星多态性检测在鉴别多发肝癌中的应用

本研究结果显示, 多发肝癌患者中的10个微卫星标志物的杂合率平均约为70%, LOH和MSI的发生率分别约为 35%和10%, 提示多发肝癌的微卫星多态 性可能主要表现为LOH. 另外, 本研究结果显示仅14.3%(5/35)的多发肝癌为MO, 明显低于国外报道(36.4% -50.0%) [4.6-7], 一方面我们选择了7条染色体上的微卫星标志物, 比仅选择两条染色体更能全面地反映瘤灶间的遗传信息, 而且本研究不仅分析了LOH的发生率, 还分析了MSI的情况, 更全面的展现了微卫星标志物的多态性; 另一方面, 可能因为本研究选择的标本均为同时多发患者, 而上述文献中的病例包含复发癌, 样本差异可能会造成结果不同; 此外, 中国人和日本人肝炎背景差异也可能导致结果不同
Lisfranc关节损伤诊断与处理原则

Lisfranc关节即通常所指的跖跗关节,早在 1815年法国外科医师Jaqcues Lisfranc de Saint -Martin在为一位士兵治疗前足坏疽截肢时,发现通过这个关节可以不用截断骨骼,且省时省力,可取得较好的效果,从此以其名字命名. Lisfranc关节损伤发生率低,约占全身骨折的0. 2%. 近年来,随着建筑、交通等工业的迅速发展,高能量损伤逐渐增多, Lisfranc关节损伤呈逐年上升的趋势~[1]. 由于 Lisfranc关节结构复杂、骨关节面重叠,依靠常规X线片.对其诊断较困难, Sherief等~[2]报告有经验的放射科和足踝外科医师平均诊断准确率为91%. Lisfranc关节损伤准确的诊断与合理有效的治疗至关重要,笔者将简单介绍Lisfranc关节的临床应用解剖与损伤机制,讨论Lisfranc关节损伤的诊断及治疗原则
浅析杂交水稻制种的产量构成与高产制种技术

分析杂交水稻制种的产量构成与高产制种技术,对提高制种产量,加快杂交水稻的推广应用,有着直接的现实意义. 通过对相关试验材料的统计分析,影响杂交水稻制种产量的主要因素是母本的有效穗数,实现高产的主要途径是增穗、保粒、提高异交结实率. 夺取高产的主要制种技术措施是应用父母本的时差、叶差合理安排调控播差期,采用1期父本大双行确定适宜的行比,配套培育壮秧,规格分厢插足基本苗,合理进行肥水管理,科学喷施"920",加强病虫害防治和抽穗扬花期适时适度赶粉,确保苗足、穗够、花遇良好、异交结实率高
半夏提取物对3种杂草的化感效应

采用生物测定方法,研究了半夏提取液对巴天酸模、反枝苋、灰绿藜发芽率、根长、芽长、干重的影响. 结果表明,不同浓度半夏提取物对受体有不同的化感效应,不同的半夏提取物对巴天酸模、反枝苋、灰绿藜的发芽率、根长、干重化感达到了显著水平,尤其是对巴天酸模. 但对3种杂草茎长化感作用不显著