mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
视网膜蔓状血管瘤合并半侧性视网膜静脉阻塞一例

视网膜蔓状血管瘤通常单眼发病.常合并皮肤、消化道、冠状动脉、眼眶及虹膜的血管异常,当合并视神经系统及中脑的血管异常时,被称为Wyburn-Mason综合症~[1].本例患者为中年男性,单眼发病,以视力下降为主要表现,眼底检查见纡曲的动静脉团块,FFA显示迅速充盈的动静脉血管团,随访期间出现下半侧视网膜出血、扩张静脉及硬性渗出,FFA显示后极部静脉充盈延缓及后期广泛强荧光,故视网膜蔓状血管瘤合并半侧性视网膜静脉阻塞诊断明确.但该患者MRA检查未见明显异常,可除外Wyburn-Mason综合症. Archer等'23将视网膜蔓状血管瘤按照疾病的严重程度分为3型:I型特征为视网膜动静脉间有异常交通的毛细血管丛.Ⅱ型特征为视网膜动静脉之间直接交通,FFA显示交通动、静脉迅速充盈,可伴渗漏.此型患者可以没有症状,也可能伴有脑部脏管异常.型特征为视网膜广泛而明显扩张的交通动静脉.该型的患者多表现为低视力,常有中枢神经系统的病变.依此分类,本例患者属于Ⅱ型.视网膜蔓状血管瘤的眼部并发症包括眼底出血、视网膜血管阻塞、新生I血管性青光眼和玻璃体积血. Mansour等~[3]认为交通动静脉造成视网膜静脉内血流静脉压增加和血液湍流出现,可引起静脉内皮损伤,这可能是伴发视网膜静脉阻塞的机制.本例患者视网膜静脉阻塞前后视力差异不大,与之前学者分析的视力影响因素不甚相符,分析其原因,考虑患者原发病灶处于后极部,基础情况下已对黄斑部视力造成较大影响,故视网膜静脉阻塞后视力变化不大
成人视网膜母细胞瘤一例

RB是好发于3岁以下婴幼儿的恶性肿瘤,7岁以上者少见.本例成人患者具备儿童RB的典型特征:眼底有黄白色肿块,肿瘤细胞凝聚力差、易脱落,引起玻璃体混浊、KP、假性前房积脓,并继发青光眼.彩色多普勒超声检查显示肿瘤内部有丰富的红蓝色m流信号,由视网膜中央动脉供血,呈高速高阻动脉频谱~[1].FFA检查显示:早期即动脉期,肿瘤即显荧光,静脉期增强,渐呈强荧光并可见渗漏,荧光消退延迟.MRI检查显示:与玻璃体相比,肿瘤T1加权像为中等强度影像,T2加权像为低强度影像.CT检查可见眼球内形状不规则的高密度块影,边界不清,密度不均.不同的是,约75%的婴幼儿患者 CT检查肿瘤内可发现形状不规则的骨密度影,为钙斑,有极大的诊断价值~[1].本例患者B型超声检查患眼未探及强回声光斑,提示肿瘤无明显钙化.CT检查患眼眼球内未发现钙斑.眼球摘除手术后病理检查见肿瘤由小圆形细胞构成,核圆形、深染,有的瘤细胞排列成典型的菊形团结构,此结构是视网膜母细胞瘤典型病理表现,可用于确诊~[2].免疫组织化学检查进一步证实了肿瘤从神经外胚叶衍生而来,并进行了鉴别诊断,排除了成人眼内黑色素瘤及嗜铬细胞瘤等肿瘤的可能.目前国内常用的神经标记物有NF、神经元特异性烯醇化酶(NSE)、胶质纤维酸性蛋白(GFAP)及S-lOO蛋白,其中NSE、GFAP、 S-IOO蛋白三种免疫组织化学染色多用于研究RB起源问题,且已得到某些明确的结论~[3].虽然在RB组织中形成菊形团的瘤细胞通常NSE(+),GFAP(-)、S-lOO(-),有双极样细胞的瘤组织的着色情况为NSE(+)、GFAP(-)、S-lOO(-),但有的未分化型瘤细胞对以上3种抗体的表达均为阴性~[4].因此,我们从临床诊断角度选取了一种神经标记物NF,它是神经细胞所特有的中间纤维.大量存在于神经元轴突中,NF(+)证实了该肿瘤组织来源于神经组织
Scale Issues of Wetland Classification and Mapping Using Remote Sensing Images: A Case of Honghe National Nature Reserve in Sanjiang Plain, Northeast China

Wetland research has become a hot spot linking multiple disciplines presently. Wetland classification and mapping is the basis for wetland research. It is difficult to generate wetland data sets using traditional methods because of the low accessibility of wetlands, hence remote sensing data have become one of the primary data sources in wetland research. This paper presents a case study conducted at the core area of Honghe National Nature Reserve in the Sanjiang Plain, Northeast China. In this study, three images generated by airship, from Thematic Mapper and from SPOT 5 were selected to produce wetland maps at three different wetland landscape levels. After assessing classification accuracies of the three maps, we compared the different wetland mapping results of 11 plant communities to the airship image, 6 plant ecotypes to the TM image and 9 landscape classifications to the SPOT 5 image. We discussed the different characteristics of the hierarchical ecosystem classifications based on the spatial scales of the different images. The results indicate that spatial scales of remote sensing data have an important link to the hierarchies of wetland plant ecosystems displayed on the wetland landscape maps. The richness of wetland landscape information derived from an image closely relates to its spatial resolution. This study can enrich the ecological classification methods and mapping techniques dealing with the spatial scales of different remote sensing images. With a better understanding of classification accuracies in mapping wetlands by using different scales of remote sensing data, we can make an appropriate approach for dealing with the scale issue of remote sensing images
农作物新品种审定对品种利用及市场管理的影响

种子是特殊的农业生产资料,是农业增产农民增收的关键因素.自<<中华人民共和国种子法>>颁布实施以来,随着种子产业市场化的形成,种子经营主体呈现多元化格局,尤其以品种市场更为突出,各育种单位纷纷抢抓机遇,采取各种技术措施加快了育种步伐,近年来通过审定的品种如雨后春笋层出不穷,对现代化农业的持续发展起到了积极的推动作用,但是大量新品种的涌现也给品种利用和种子市场管理带来新的难题,需要认真对待,妥善解决
中优T16高产制种技术

中优T16是贵州省铜仁地区农业科学研究所用中9 A与恢复系TR16配组育成的迟熟籼型三系杂交水稻新组合,分蘖较强,生长旺盛,穗型中等,着粒较密,适宜我省中籼迟熟稻区种植,有较大增产潜力.TR16花期长,花粉量大,制种易获高产.2009年通过贵州省农作物品种审定委员会审定
高产,耐寒杂交水稻新组合Ⅱ优406的特征特性及其生产技术

杂稻组合Ⅱ优406是贵州省水稻研究所用自育的耐寒恢复系G406与不育系Ⅱ-32 A配组育成的,于2009年通过贵州省农作物品种审定委员会审定的高产,耐寒杂交水稻新组合
光照强度对克新5号脱毒试管苗生长的影响

以克新5号脱毒试管苗为试验材料,研究光照强度对马铃薯脱毒试管苗苗干重,根干重,株高,叶片数,根条数和根长的影响.结果表明:光照强度为2 5005 000 lx能有效促进马铃薯脱毒试管苗生长.此条件下,培养14 d时,平均单株苗干重55 mg,根干重26 mg,株高6.20 cm,叶片数6.8片,根条数6.7条和根长5.41 cm
优质籼型糯稻新品种遵糯优101的选育及高产栽培技术

遵糯优101是遵义市农科所通过复合杂交选育而成的优质,高产,稳产,抗性强,适应性广的糯稻新品种.2008年通过贵州省农作物品种审定委员会审定
米瓦罐种子发芽特性的研究

对野生米瓦罐的种子发芽特性进行了研究,结果表明:米瓦罐的适宜浸种时间为1014 h;米瓦罐种子休眠的限制因素为温度,发芽适温为610℃,温度达20℃后,米瓦罐不会发芽;GA不会打破米瓦罐种子的休眠,对种子发芽没有明显的促进作用;种子贮藏10个月后发芽势和发芽率有明显的下降
云雾贡茶----贵州山茶属一新变种

描述了贵州山茶属一新变种----云雾贡茶(Camelliasinensis(L.)Kuntze var.niaowangensisQ.H. Chen.该变种与原变种茶树(Camellia sinensisvar.sinensis)的主要区别在于叶片较大,质地较薄,叶表面侧脉明显下凹,叶面呈皱纹状,花萼片背面被微毛,边缘具缘毛
川芎嗪对肺心病患者肺动脉压及血管内皮细胞功能的影响

目的:探讨川芎嗪对肺心病肺动脉压的影响及其机制.方法:将肺心病患者随机分为常规治疗组和常规治疗+川芎嗪治疗组(川芎嗪组),测定两组治疗前、后的右室射血前期时间与肺动脉血流加速时间比值 (RVPEP/AT)的变化,作为衡量肺动脉压的指标;此外,测定健康组及两治疗组治疗前、后的血浆血管性假血友病因子(vWF)、内皮素-1(ET-1)和一氧化氮(NO)含量的变化.结果:治疗前两治疗组血浆vWF和ET-1明显高于健康组,而血浆NO明显低于健康组(P<0.01).两治疗组治疗后RVPEP/AT比值、血浆vWF和ET-I含量均低于治疗前,而血浆NO高于治疗前(P<0.01);但所有这些变化均以川芎嗪组的变化程度更明显(P<0.01).两治疗组血浆ET-1含量与RVPEP/AT比值呈正相关(r=0. 591,P<0.01);两治疗组血浆NO含量与RVPEP/AT比值呈负相关(r=-0. 617,P
基于对数平均迪氏指数法的天津市能源消费碳排放分解分析

根据联合国政府间气候变化专门委员会(IPCC)2006年版碳排放计算指南中的计算公式和碳排放系数缺省值计算了天津市2000--2008年能源消费的碳排放量,然后对人均GDP,人口和能源强度与碳排放量作相关性分析,运用对数平均迪氏指数(LMDI)法对天津市能源消费碳排放量和碳排放强度进行分解分析,最后探讨了其主要影响因素的作用机制并提出相应的政策建议
成人输尿管胚胎性横纹肌肉瘤1例

胚胎性横纹肌肉瘤(embryonal thabdomyosarco-ma, ERMS)是具有胚胎性骨骼肌的表型和生物学特征的一种原始的恶性软组织肉瘤, 是儿童和青少年软组织肉瘤的最常见类型, 占小儿实体瘤的8% -10%, 很少发生于成人. 起源于成横纹肌细胞, 或发生于无横纹肌或无肌肉处. 目前认为这些部位的横纹肌肉瘤来自原始的间充质, 具有向成肌细胞发育的潜力, 因而发病部位相当广泛, 常见部位包括头颈部(约37%)、泌尿生殖系(约21%)、四肢(约200%), 其他尚可见腹膜后、躯干、胃肠道及胸腔等部位. 病因可能与遗传因素有关, 多数胚胎性横纹肌肉瘤表现为+2q、+8、+20、-llp15非随机性染色体异常. 确诊需行病理检查. ERMS组织特征常不典型, 有必要的进行免疫组化染色检查. 若Desmin、MyoDI和 Syn等表达阳性则可以确诊; 多采用综合治疗原则, 最常用的化疗方案为VAC方案. 年龄小的患者预后好, 成人预后较差. 本例患者病程晚, 年龄高, 预后极差
培育生命之树 追溯思想之源

在40多亿年的历史中,地球上的生命伴随地球的发展而进化,期间大部分时间里,生命只存在于海洋.伴随地球大陆漂移,物理环境及气候的变化,生命由海洋迁徙到陆地,逐步进化演变并出现人类.由此,人类和自然走上了一条相互冲突的道路,人类的活动对地球环境和资源造成了不可逆转的损失.正是"生命因地球变化而变化,地球也因生命的变化而改变"
找工作时遇到的几个问题

我的硕士研究生生活不久就要结束了.以前有过攻读博士学位的想法,但后来基于种种考虑,决定不再继续深造.既然不打算继续上学,找工作成了眼下一件很紧要,很棘手的事.这段日子,我一直在为这件事而破费脑筋.下面简单说说自己找工作时遇到的一些事儿
费根鲍姆的混沌之路

决定一位科学家获得成功的因素有很多,但是科学家自己的个性无疑是最为基本的.物理学家M·费根鲍姆(M. Feigenbaum,1944-),在其混沌理论研究上走出的成功之路,也许对每位青年学者会有所启迪
FINITE ELEMENT METHOD WITH SUPERCONVERGENCE FOR NONLINEAR HAMILTONIAN SYSTEMS

This paper is concerned with the finite element method for nonlinear Hamiltonian systems from three aspects: conservation of energy, symplicity, and the global error. To study the symplecticity of the finite element methods, we use an analytical method rather than the commonly used algebraic method. We prove optimal order of convergence at the nodes tn for mid-long time and demonstrate the symplecticity of high accuracy. The proofs depend strongly on superconvergence analysis. Numerical experiments show that the proposed method can preserve the energy very well and also can make the global trajectory error small for long time
放射工作者年有效剂量与遗传指标关系研究

微核是真核细胞中的一种异形结构,是染色体畸变在间期细胞中的一种表现形式,微核的形成又是细胞受遗传毒物作用后的一种遗传学终点~[2];染色体是遗传物质的载体,对电离辐射有很高的敏感性;同时遗传损伤效应的随机性,其发生概率与照射剂量有关~[3]
甘蓝型油菜开花期SPAD值,叶绿素含量与氮素含量叶位分布特点及其相互关系

通过测定甘蓝型油菜秦油10号开花期不同叶型叶片的SPAD值与叶绿素含量及N含量,研究开花期叶片SPAD值,叶绿素含量及N含量的变化,并探讨了叶片SPAD值与叶绿素含量及N含量之间的关系.结果表明:①开花期不同叶型叶片的SPAD值,叶绿素含量,N含量随着时间的推移呈不同程度的下降,开花后2周至开花后3周叶片含N量迅速下降,短柄叶与无柄叶分别下降20%和26%;②盛花期(花后2周)不同叶型叶片叶绿素含量与N含量无柄叶>短柄叶,长柄叶,差异达到显著水平,SPAD值差异未达显著水平;③盛花期不同叶型叶片的SPAD值与叶绿素含量及N含量之间呈线性正相关,相关系数分别为0.862 0**,0.711 8*,达到显著或极显著水平
恶性黑色素瘤早期多发转移一例

黑色素瘤是一种少见的肿瘤,由Gar-swell在19世纪初命名, 1892年Hutchin-son认为外伤可引起黑色素瘤, 1912年Dubreuilh提出黑色素瘤可发生于身体任何处.国内1951年华东军区总医院首先报道了1例皮肤黑色素瘤[1].恶性黑色素瘤占全部恶性肿瘤的2%,国内有人统计皮肤恶性黑色素瘤在人口中的发病率为0.007/10万,病死率约占癌症病死率的1% ~2%[2],往往不引起足够的重视.恶性黑色素瘤好发于白种人,澳大利亚昆士兰州是著名的高发区,发病率每年达16.4/10万[1].在我国,其发病率不高,发病年龄多在30岁以上,且无明显的性别差异,但病灶分布与性别有关,男性多发生在躯体,女性多发生在肢体
河北省农业种植结构的优化对策研究

运用灰色关联分析模型对河北省农业总产值进行了灰色关联分析,在此基础上,运用GM(1,1)预测模型对其发展趋势进行了预测,从而确立河北省农业种植结构中的主导产业,同时指出,继续加大科技支农力度,转移农村剩余劳动力,使农业向集约化,现代化方向发展和转变
乡村复合型生态旅游"联动"发展的实证研究----以苏中姜堰市为例

随着我国经济与社会发展,乡村旅游已成为促进农村经济发展,增加农民收入,拉动社会主义新农村建设的新亮点.通过对江苏省姜堰市乡村旅游的实证分析,探寻建立和发展我国乡村复合型生态旅游"联动"发展的新模式,进而发现其对促进农村经济与社会发展,社会主义新农村建设具有重要的意义
辽宁省近50年来春旱评估分析

利用辽宁省50个站点1960--2008年春季降水资料,采用Z指数对辽宁省各单站春旱进行等级划分,并在此基础上对整个区域春旱进行全面的评估.结果表明:辽宁省发生春旱的频率较高,共有21年,占评估年份的42.9%,其中发生春旱为特旱的共9年,占评估年份的18.4%;自20世纪90年代以来,辽宁省春旱表现出增加的趋势;省内各地都有春旱的发生,春旱发生的地域性不强
不同施肥措施对豫中小麦--玉米轮作体系土壤微生物生物量碳,氮的影响

为探讨豫中高产农田生态系统中化肥和秸秆还田等培肥措施对土壤肥力的影响,在豫中小麦--玉米轮作农田上进行了定位试验.试验设5个处理,分别是:(1)对照;(2)NPK(氮,磷,钾化肥);(3)NPK+半量秸秆还田(冬小麦,玉米秸秆各半量);(4)NPK+全量秸秆(冬小麦,玉米秸秆各全量);(5)NPK+倍半量秸秆(冬小麦,玉米秸秆各倍半量).试验结果表明:土壤微生物量碳在冬小麦拔节期到灌浆期,玉米大喇叭口期到成熟均呈增加趋势;土壤微生物氮变化的总体趋势与微生物量碳相同,但冬小麦季微生物量氮的最低值出现在抽穗期;单施NPK肥使土壤微生物量碳,氮有增加趋势,NPK+秸秆对土壤微生物碳和氮有进一步提升的趋势,并能缓解化肥施用后对土壤微生物的抑制作用;从冬小麦--夏玉米轮作周期看,不同秸秆用量对微生物量碳,氮的影响趋势是:NPK+全量秸秆>NPK+倍半量秸秆>NPK+半量秸秆
利多菌对犊牛生长性能及血清理化指标的影响

将40头新近断奶,体重相近的荷斯坦母犊牛随机分为2组(试验组和对照组),对照组按照牛场正常饲养管理,试验组直接在日粮中添加利多菌2 000 g/t,试验期28 d,研究以芽孢杆菌为主的益生素制剂(利多菌)对犊牛生长性能及血清理化指标的影响.结果表明:试验组和对照组犊牛的增重差异不明显(P>0.05),犊牛腹泻率和咳嗽率分别降低了58%和33%,对血清理化指标的影响差异不显著(P>0.05).以上结果表明利多菌对控制犊牛腹泻和咳嗽有较明显效果,但对犊牛增重和血清理化指标的影响不明显
蔬菜地磷淋失调控途径的研究

针对蔬菜地磷渗漏污染问题,比较研究粉煤灰,石膏,碳酸钙,氯化铁,硫酸铝5种处理对模拟灌溉条件下渗漏液中磷含量的影响.结果表明:硫酸铝,氯化铁处理渗漏液中水溶性全磷在0.030.50 mg/L之间,比对照降低了57%95%;处理后渗漏液中钼酸铵反应性磷也有相同的趋势.粉煤灰,石膏,碳酸钙3处理有一定的控制效果.在60 d的模拟试验期间,对照处理磷总流失量为77.1 mg/m2,硫酸铝,氯化铁处理分别为10.9 mg/m2,17.1 mg/m2,降低了85.9%,77.8%.氯化铁处理不利于植物生长,但硫酸铝处理对植物的影响较小(生物量降低33%).可见,硫酸铝可以有效控制蔬菜地的磷流失,对植物影响较小;氯化铁也可以有效控制磷流失,但易产生不利影响
营养液培莴苣硝酸盐含量的控制方式与效果

以不同的营养液配方,营养液的不同浓度以及结合供营养液和断营养液对莴苣生长发育,产量,硝酸盐含量的影响进行研究,结果表明:不同的营养液配方,营养液的不同浓度对莴苣生长发育,产量的影响不大,对硝酸盐含量影响差异显著.断营养液间隔1周采收可有效地降低硝酸盐的积累,对产量影响不大
扬州市邗江区水稻黑条矮缩病发生规律及防治对策

针对2008年扬州市邗江区发生水稻黑条矮缩病情况,介绍了黑条矮缩病的发生症状及特点,分析了水稻黑条矮缩病发生流行的原因,并提出了相应的防治措施
高温胁迫对蝴蝶兰试管苗形态及叶片抗氧化特性的影响

以蝴蝶兰品系EG-727为试材,研究了38℃/32℃(昼/夜)高温胁迫对蝴蝶兰试管苗形态及叶片抗氧化特性的影响.结果表明:长期高温胁迫导致蝴蝶兰试管苗受到伤害,42 d后叶片出现大面积黄化萎蔫,49 d后开始腐烂和死亡;可溶性蛋白含量先降低后升高;丙二醛(MDA)含量与相对电导率的变化趋势基本一致,35 d前变化差异较小,35 d后显著增加;超氧化物歧化酶(SOD),过氧化物酶(POD)和抗坏血酸过氧化物酶(APX)活性在49 d以前表现出不同程度的增加,之后均转为下降趋势,而过氧化氢酶(CAT)活性的变化趋势与之相反.研究结果显示:38℃/32℃(昼/夜)胁迫造成明显氧化伤害时间节点可能在第49天.因此,利用38℃/32℃(昼/夜)高温热处理蝴蝶兰试管苗脱毒时不宜超过49 d
施肥对青海门源地区青稞产量及经济效益的影响

采用小区试验,研究了6种施肥处理对青海门源地区青稞产量和经济效益的影响.结果表明,各施肥处理与无肥对照间经济产量和生物学产量差异显著(P<0.05),其中有机-无机肥配施处理经济产量,生物学产量和纯收益最高.氮磷配施和有机无机肥配施在单株产量,穗长,主穗粒数等指标上较其他施肥处理具有明显综合优势,上述指标与经济产量间呈极显著正相关关系(P<0.01).在青稞生产中应大力推广氮磷配施和有机无机肥配施
甘薯黑斑病的研究现状与展望

概述了甘薯黑斑病致病菌的生物学特性,危害症状,致病机理,甘薯对黑斑病的抗性鉴定,抗性遗传特点和防治方法,并展望了甘薯黑斑病的研究前景
不同番茄品种对早疫病的抗病性研究

经对河南省栽培的11个番茄品种进行叶部和茎部抗早疫病研究,仅中杂11一个品种属叶部耐病,茎部抗病的品种;中杂101,中杂106为茎部耐病,叶部轻微感病的品种;其余品种基本都是茎,叶感病或高感.一般情况下接种孢子悬浮液后番茄植株茎部发病都明显滞后于叶部发病,接种后2周病情基本稳定,此时可较好地反映供试品种的抗病性情况
甘蓝型杂交油菜收获指数及其品种间差异性研究

对四川盆地宜栽的29个甘蓝型杂交油菜品种的收获指数,生物产量,经济产量,粒壳重比,粒枝重比,粒茎重比等部分性状进行相关性分析.结果表明:供试油菜品种中,单株经济产量超过50 g的品种有9个,其中早杂2号和(MZA×508B)×(98R-3×C18-14)的单株经济产量在54 g以上;油菜的经济产量主要受生物产量的影响,只有在较高生物产量的基础上提高收获指数才有意义;油菜粒茎重比对收获指数的影响最大,粒枝重比次之,粒壳重比最小;在生物产量相当的情况下,适当控制茎秆重有利于油菜产量的提高
早熟晚粳南粳44机插持续高产高效技术定量化探讨

为发挥早熟晚粳品种南粳44的高产潜力,提高南粳44在本地区和同类生态地区的产量水平,以精确定量栽培技术及理论为指导,对南粳44在机插条件下的高产和超高产形成规律及技术进行定量化探究;并在不同类型土壤上建设百亩方进行检验,证明该技术能有效提高南粳44产量,降低生产成本
Automated process parameters tuning for an injection moulding machine with soft computing

In injection moulding production, the tuning of the process parameters is a challenging job, which relies heavily on the experience of skilled operators. In this paper, taking into consideration operator assessment during moulding trials, a novel intelligent model for automated tuning of process parameters is proposed. This consists of case based reasoning (CBR), empirical model (EM), and fuzzy logic (FL) methods. CBR and EM are used to imitate recall and intuitive thoughts of skilled operators, respectively, while FL is adopted to simulate the skilled operator optimization thoughts. First, CBR is used to set up the initial process parameters. If CBR fails, EM is employed to calculate the initial parameters. Next, a moulding trial is performed using the initial parameters. Then FL is adopted to optimize these parameters and correct defects repeatedly until the moulded part is found to be satisfactory. Based on the above methodologies, intelligent software was developed and embedded in the controller of an injection moulding machine. Experimental results show that the intelligent software can be effectively used in practical production, and it greatly reduces the dependence on the experience of the operators
Kinetics of austenite grain growth in medium-carbon niobium-bearing steel

In order to locate a reasonable heating system, the austenite grain growth behavior of Nb microalloyed medium carbon steel has been experimentally studied at various austenitizing temperatures and for different holding times. It is indicated that austenite grain growth increases with increasing austenitizing temperatures and holding times. Particularly when the austenitizing temperature was above 1100 ℃, austenite grains grew rapidly, and an abnormal austenite grain growth was observed. When the austenitizing temperature was lower than 1100 ℃, austenite grain size and growth rate were small. The activation energy of grain growth in the tested steel is 397 679.5 J/mol. To ensure an absence of coarse grains in microstructures, the heating technology of the tested steel should be controlled for 1 h at 1100 ℃. The relationships of austenite average grain size with soaking temperature and time of tested steel were obtained by mathematical calculation, and austenite average grain size was found to be in agreement with the measured size for different holding times
Pollen assemblages of cultivated vegetation in central and southern Hebei Province

The study on 82 surface soil pollen samples from different types of cultivated vegetations in central and southern parts of Hebei Province indicates that the pollen assemblages from farmlands in the plain have not only their own plant types, but also the pollen components from the nearby mountains. Arboreal pollen percentages and concentrations(dominated by Pinus) from farmlands in mountain area are higher than those in the plain, and it reduces gradually with the increasing distance away from the mountains. Taking Pinus pollen in Taihang Mountains as an example, its content is 20%-30%, 10%-20%, 20%-30% and below 16% respectively for the samples from the area of 0-50, 50-100, 100-150 and more than 150 km away from the east Taihang Mountains. The increase of Pinus pollen proportion in the central plain is probably related to the fohn effect. The spatial variation of AP from mountains to the plain in Hebei Province may be similar to the forests clearance by human activities in the early historical period. Shrubby pollen proportion is small both in mountains and in the plain, but their major components are different. Elaeagnaceae, Corylus, Ostryopsis and Oleaceae are common in mountain areas, while there are relatively high contents of Rosaceae and Vitaceae in the plain. Herbs content in the plain (about 60%) is 15% higher than that in mountains, among which the Cereals and Cruciferae pollen percentages are 5% and 2% higher respectively. Artemisia pollen percentage in the plain is lower than that in mountains. Since the human activities are weaker in mountains compared with that in the plain, the general trend is that Chenopodiaceae pollen increases from mountains to the plain gradually, reflecting the raising intensity of human activities. The fern spores of Selaginella sinensis in mountains are higher than that in the plain, but it still reaches to about 7% in the plain. The fern spores of Selaginella sinensis are not prone to be spread by wind, indicating that those in the surface soil of the plain may be carried by river water from mountains during the deposition of the plain
Dynamic analysis of urban spatial expansion and its determinants in Xiamen Island

Most of the world's cities are concentrated in coastal areas. As a special geographical component of the coastal system, island urban spatial expansion is the outcome of interactions between city development and the physical environment. This paper takes Xiamen Island, located in Southeastern China, as an example to analyze island urban spatial expansion and its determinants by combining an analysis of the literature on urban development policies, urban overall plans, population growth and industrial development, with geographical information analysis using historical maps and remote sensing photographs. Firstly, we reviewed the history of the Xiamen City development during the last 100 years, which can be divided into four periods: the embryonic modern city and early development from 1908 to 1949; administrative boundary expansion and infrastructure development from 1950 to 1979; special economic zone construction and rapid urbanization from 1980 to 2003; and Bay City construction since 2003. The dynamic changes to the coastline, island shape, built-up area, transportation, administrative division, and major land use type conversion which occurred during approximately the past 100 years were analyzed and the characteristics of the island urban spatial expansion were concluded: early expansion from a central point, followed by expansion along a section of coastline, and expansion from the coastline inland. Secondly, we discussed the potential determinants of island urban spatial expansion including administrative division adjustment, urban master planning revision, industrial development, topographical factors, coastal area reclamation, transportation expansion, and population growth. Finally, the effects of each potential determinant on island urban spatial expansion were concluded. Island urban spatial expansion is the result of a synthesis of natural and socio-economic factors which are not independent but interacting. Built-up area expansion is the major driver of island land cover and land use changes. By this paper, we hope to provide a scientific reference contributing to the rational understanding of island and coastal sustainable urbanization in China, and the world beyond
CABYR binds to AKAP3 and Ropporin in the human sperm fibrous sheath

Calcium-binding tyrosine phosphorylation-regulated protein (CABYR) is a highly polymorphic calcium-binding tyrosine- and serine-/threonine-phosphorylated fibrous sheath (FS) protein involved in capacitation. A putative domain (amino acids 12-48) homologous to the regulatory subunit of type II cAMP-dependent protein kinase A (RII) dimerisation and A kinase-anchoring protein(AKAP)-binding domains of protein kinase A at the N-terminus suggests that CABYR may self-assemble and bind to AKAPs. Moreover, there is evidence that CABYR has limited interaction with AKAPs. However, further evidence and new relationships between CABYR and other FS proteins, including AKAPs, will be helpful in understanding the basic physiology of FS. In this study, a new strategy for co-immunoprecipitation of insoluble proteins, as well as the standard co-immunoprecipitation method in combination with mass spectrometry and western blot, was employed to explore the relationship between CABYR, AKAP3 and Ropporin. The results showed that AKAP3 was co-immunoprecipitated with CABYR by the anti-CABYR-A polyclonal antibody, and, conversely, CABYR was also co-immunoprecipitated with AKAP3 by the anti-AKAP3 polyclonal antibody. Another Rll-like domain containing protein, Ropporin, was also co-immunoprecipitated with CABYR, indicatingthat Ropporin is one of CABYR's binding partners. The interactions between CABYR, AKAP3 and Ropporin were confirmed by yeast two-hybrid assays. Further analysis showed that CABYR not only binds to AKAP3 by its RII domain but binds to Ropporin through other regions besides the Rll-like domain. This is the first demonstration that CABYR variants form a complex not only with the scaffolding protein AKAP3 but also with another Rll-like domain-containing protein in the human sperm FS
珠三角新型农业科技服务体系重构研究

农业科技服务是现代农业专业化,产业化的重要技术支撑体系之一.对珠三角地区农业科技服务体系现状进行调研,分析了珠三角农业科技服务存在的问题,借鉴国内外农业科技服务的主要工作模式和经验,提出了促进珠三角地区农业科技服务体系重构的对策措施
构建海南-东盟热带农业空间产业链浅析

新形势下,把热带农业产业链理论观点,推广应用到海南与东盟热带农业合作与发展上,根据两者在发展热带农业上的相似性和各自优势,以共同开发中国与非热带地区的国家市场,本着平等协调,自主选择的原则,各自提出本国或本地区需要参与的具体农业行业,进行区域分工,整合资源,产品,生产,市场等过程和要素,设计"东盟农业生产基地-海南农产品加工与物流配送+中国市场和非热带地区的市场-实现产业链整链效益"的发展模式,构建热带农业空间产业链,获取比传统生产经营模式的经济效益,促进海南与东盟热带农业的又好又快发展
基于创新人才培养模式的大学基因工程理论教学改革探索

从如何调动学生积极性,教学内容,教学手段,教学方法和考核方式几方面对基因工程理论教学进行了探索性的改革,旨在提高基因工程理论教学质量,满足生物技术专业和创新型应用人才培养的要求
Enhanced Sensitivity and Selectivity of Chemosensor for Malonate by Anchoring on Gold Nanoparticles

A novel organic-inorganic nanohybrided receptor 4 functionalized with bis-thiourea arms and then assembled on gold nanoparticles was synthesized. The preorganized system possesses phenylthiourea units for the spectrophotometric sensing of dicarboxylates, especially malonate, based on changes in the surface plasmon absorption of the gold nanoparticles (GNPs). The intensity of the absorbance band increases gradually with the concentration of dicarboxylates increasing. But such an ion-selective change in the plasmon band was not observed in control tests carried out by mono-thiourea-modified GNPs, receptor 3 and the free receptor 2. As it is shown from the association constants, derived from quantitative titrations, receptor 4 can selectively recognize dicarboxylate anions of shorter carbon chain, and has the highest affinity to malonate. The interaction properties for anions of receptor 4 were evaluated by 'H NMR and UV-vis spectroscopic methods
Effect of Substitution of Cobalt for Iron in Sr_4Fe_60_(13-δ) on the Catalytic Activity for Methane Combustion

A series of mixed oxides Sr_4Fe_(6-x)Co_xO_(13-δ) (x=0, 1, 2, 3, or 4) were prepared by sol-gel method and used for catalytic combustion of methane. The structural properties of oxides were characterized by XRD, TGA, and XPS. The layered intergrowth perovskite-like oxide Sr_4Fe_5CoO_(13-δ) exhibits the highest catalytic activity for methane combustion under the experimental conditions. The enhanced catalytic activity of Sr4Fe5CoO_(13-δ) for methane combustion could be attributed to the increased amount of oxygen vacancy caused by the partial substitution of cobalt for iron in the Sr_4Fe_60_(13), which was confirmed by TGA and XPS
T细胞免疫参与母-胎免疫调节的研究进展

母-胎免疫调节中T细胞免疫起着重要作用,CD4+CD25+调节性T细胞(CD4+CD25+Treg细胞),Th1/Th2型细胞因子,T细胞表达的CTLA-4是研究热点,孕早期CD4+CD25+调节性T细胞由外周血向母-胎界面迁移,妊娠期间外周血存在调节性T细胞数量的扩增,尤其是FOXP3+调节性T细胞的数量及免疫抑制活性对母-胎免疫调节起重要作用.协同刺激分子CTLA-4对T细胞免疫有负性调节作用,与Th型细胞因子,调节性T细胞之间相互联系,相互作用,共同参与母-胎免疫调节
线粒体与哺乳动物卵母细胞成熟及早期胚胎发育

哺乳动物卵母细胞成熟以及早期胚胎发育,是复杂的生物学过程,必须经历一系列细胞核和细胞质的协调有序变化才能实现.线粒体是细胞质内最重要的细胞器,在卵母细胞成熟和早期胚胎发育过程中,线粒体经历了阶段性的空间再分布,线粒体的结构缺陷和拷贝数的异常都可能影响卵母细胞的成熟和胚胎的发育.线粒体最主要的生物学功能就是产生ATP,为维持卵母细胞和胚胎的正常生命活动提供能量
第二届中国当代科学口述历史学术研讨会纪要

口述史在史学界的兴起, 不过是几十年问的事. 可一则它丰富了史学研究的方法, 对研究过程中史料的搜集、材料的取舍、写作的方法都产生了深远的影响, 二则它拓宽了史学研究的范围, 在亲历者的讲述之中, 越来越多原本未被注意到的群体、未被发现的问题走进了历史学家的视野, 史学研究走出书斋, 接了"地气"、"人气", 变得丰富起来, 而且随着参与者的增多, 原本"沉默的大多数"有了述说历史记忆、参与重构历史图景的权利. 因此, 数十年来, 国内外口述史领域呈现出蓬勃发展的态势. 近年来, 在一批有识之士的带领和呼吁下, 国内越来越多的科技史学者开始涉足口述史领域, 政府也开始重视老科学家个人资料的采集工作, 启动了相关项目, 因而中国当代科学口述史总体上呈现出方兴未艾的良好局面
当药的研究进展

当药为獐牙菜属植物瘤毛獐牙菜的干燥全草.在龙胆科獐牙菜属众多的植物中虽不出众,但却具有悠久的历史记载和广泛的民间应用,且临床疗效确切.文章综述了药材的历史记载,当今的应用情况,以及化学成分,药理作用,纯化工艺,质量控制方法,公开了笔者在当药工艺和质量控制方面所作的工作及知识产权的相关情况
草龙化学成分的研究

目的研究草龙Ludwigia hyssopifolia(G.Don)Exell的化学成分.方法利用硅胶色谱,AB-8大孔吸附树脂色谱柱和Sephadex LH-20色谱柱进行分离纯化,通过理化性质和波谱分析鉴定化合物的结构.结果从草龙的正丁醇提取物中分离鉴定了两个化合物,分别为山柰酚(Ⅰ),人参皂苷Rb1(Ⅱ).结论两个化合物均为首次从该植物中分离得到
合并线粒体病患者麻醉一例

线粒体是普遍存在于除哺乳动物成熟红细胞之外的真核细胞中的细胞器. 它是细胞进行生物氧化和能量转换的主要场所. 细胞生命活动所需能量的80％是由线粒体经过氧化各种物质而产生的[1]. 线粒体病是遗传缺损引起线粒体代谢酶缺陷, 致使ATP合成障碍、能量来源不足导致的一组异质性病变. 发病率大约为1/6 500, 可为无症状携带者. 线粒体病可发生在任何年龄组和身体的任何部位, 表现出多种不同形式的神经系统障碍和其他系统的异常[2]. 因此, 线粒体病可以说是一种导致多系统紊乱的疾病, 它能损伤不止一种体细胞、组织或器官, 其导致的症状也因人而异
微波技术在油茶籽制油工艺中的应用

油茶籽油是我国传统的木本食用油之一, 其生产历史源远流长. 为充分利用有限资源, 提高'油脂得率, 将微波技术应用于油茶籽制油中. 通过常规制油工艺与微波辅助工艺的比较, 微波辅助工艺制取油茶籽油具有油品质量好、消耗低、经济效益和社会效益较高的优势, 值得推广应用
基于灰色理论给水管网微观模型用水模式的动态更新研究

目前给水管网建模过程中用水模式的更新多以实时监测数据为基础,这种方法存在一定的滞后性和笼统性.针对此问题,通过对实测数据建立灰色预测模型,以预测结果作为下一管网运行周期的用水模式,提高了用水模式更新的准确度,进而通过对用水模式的动态更新实现了对模型的更新维护,为给水管网微观模型的动态维护提供了一种新方法
自动跟踪定位射流灭火系统特性分析

从现代消防发展趋势角度出发,阐述了6种自动跟踪定位射流灭火装备在自动跟踪定位射流灭火系统中的功能和作用.通过对6种灭火装备性能参数,结构形式,动作特性和探测器控制形式的分析,分别说明了其特点和适合运用的场合.同时,还对自动跟踪定位射流灭火系统存在的不足提出建议
焙烧颗粒膨润土的制备及其对废水中Mn~(2+)的吸附研究

对膨润土颗粒吸附剂进行了制备,焙烧改性,并通过静态吸附试验,对制备的改性吸附剂处理矿山废水中的Mn2+进行了试验研究.结果表明,颗粒吸附剂制备,焙烧改性的最佳条件是:膨润土与蒸馏水质量比为25:18,膨润土颗粒的粒径为2mm,焙烧温度为500℃,焙烧时间为1.5h.在pH 6,温度为25℃,转速50r/min,进水Mn2+105.86mg/L,吸附剂投加量0.28g/L和吸附时间60min的试验条件下, Mn2+的去除率达96%以上,且吸附剂对Mn2+的吸附符合Langmuir吸附方程
化肥汽轮发电机和氮气压缩机叶片结垢原因分析及措施

介绍了某公司化肥装置热电3#汽轮发电机组汽轮机,氮气压缩机组和空气压缩机组的透平机叶片结垢的原因和危害,并采取了相应的处理方法和多项改进措施.在生产运行中加强水质监督,保证蒸汽品质,取得了明显的效果,提高了机组的运行效率,保障了机组高效,安全,稳定,经济运行
概率法对给排水设计秒流量的分析

从概率法出发对给水设计秒流量计算公式进行推导,对该公式的特性进行了分析,用集体宿舍和住宅实测数据对推导公式进行了验证.最后对排水设计秒流量与给水设计秒流量的关系进行了分析
人民大会堂宾馆改造工程给水排水设计

人民大会堂宾馆综合改造是老旧宾馆改造工程.主要针对工程在使用中出现的冷热水压力不平衡,集水坑产生臭味,消防水量不足等问题,给出解决的方法;针对房间功能改造上出现的问题,结合现场探讨解决方案及设计中需要注意的事项