INTERGROWTH-21^(st)标准评价胎儿宫内生长受限的临床价值

目的探讨INTERGROWTH-21^(st)标准评价胎儿宫内生长受限的应用价值。方法本研究为前瞻性队列研究。收集2015年3月至2016年3月在复旦大学附属妇产科医院建卡,进行常规产前检查并入院分娩的单胎妊娠孕妇。所有入选病例孕28周之后入组,每4周做一次产前超声生长测量,直至分娩前。胎儿生长径线以INTERGROWTH-21^(st)标准计算Z-score值。分娩后随访新生儿体重等相关信息。应用Logistic回归方程建立预测公式。最后将新公式与Hadlock法预测IUGR的准确性进行对比。结果共收集符合入组条件的孕妇834例。排除失访143例后,得到对照组565例和IUGR组126例。新预测公式的敏感性、特异性、阳性预测值、阴性预测值、假阳性率、假阴性率分别为:88.9%、85.4%、57.7%、97.2%、14.6%、11.1%。Hadlock法预测的敏感性、特异性、阳性预测值、阴性预测值、假阳性率、假阴性率分别为:81.7%、82.7%、51.2%、95.3%、17.3%、18.3%。结论以INTERGROWTH-21^(st)标准计算Z-score建立新公式预测胎儿宫内生长受限的方法,与传统的Hadlock预测法相比,改善了产前诊断的敏感性和特异度,减少了假阳性和假阴性的病例,全面提高了超声预测胎儿宫内生长受限的准确性。

贵州织金互层型磷块岩工艺矿物学及浮选试验研究

对贵州织金地区中低品位磷块岩进行工艺矿物学研究,查明了矿石的矿物组成、化学组成、嵌布特征、矿物粒度分布等。结果表明,矿石中主要有用矿物是氟磷灰石,脉石矿物主要是石英,氟磷灰石含量为57.62%,白云石含量为25.34%,还含有少量的石英、黄铁矿、方解石等。氟磷灰石与白云石、石英的嵌布关系紧密,连生关系以三连生以上为主,嵌布关系复杂。利用工艺矿物学参数自动分析系统(BPMA)、X射线衍射(XRD)、X射线荧光光谱仪(XRF)等分析手段并结合相关数据,确定了采用二段式反浮选脱镁工艺流程,可以获得P_(2)O_(5)品位为32.40%、P_(2)O_(5)回收率为85.13%的磷精矿,MgO含量由12.50%降至1.60%,选矿指标较为理想,为该地区磷矿的开发和利用提供了一定的技术依据。

超导磁选白云鄂博尾矿稀土颗粒捕获及聚集行为

超导磁分离技术中,稀土矿物颗粒在磁介质上的聚集半径与磁介质填充率应相互匹配,以确保高效的矿物分离效果和提高稀土尾矿资源利用率。基于颗粒轨迹模型,探究了矿浆流速对颗粒捕获的影响并建立了颗粒饱和聚集模型,以计算稀土矿物颗粒单体及其连生体在磁介质上的饱和聚集半径、聚集半径和磁介质间距关系,从而优化磁介质填充率。并通过颗粒沉积试验,验证了聚集模型的正确性。研究结果表明,矿浆流动速度最优为0.1m/s时有效去除了杂质萤石矿物。磁介质有一个临界填充率,高于临界填充率不会发生堵塞。随着磁介质直径的增加,颗粒饱和聚集半径rBa和磁介质临界填充率逐渐增大,当连生体度为1/20的稀土连生体与磁介质直径为0.06mm时,临界填充率为5.6%。当磁介质直径为0.4mm时临界填充率为20.6%。本研究结果为稀土矿物的高效分离提供了重要的理论基础,也为工业生产中磁分离技术的优化与设计提供了可靠的参考依据。

基于PAD模式的地方高校课程改革实践与效果研究

基于移动互联技术,将PAD教学模式应用于浙江省某财经类地方高校专业课程,对地方高校PAD课堂教学方法和教学评价进行优化。PAD模式的教学实践和调查研究表明,学生在教学过程中能够保持高出勤率,学习投入和学习积极性普遍较高,学习能力、思维能力得到了较大提升,对课堂参与感和掌控感的渴望愈加强烈,并希望继续保持课程的授课方式。与此同时,PAD教学模式对大学教师的教育教学能力提出了更高的要求。

Hydroisomerization performance of platinum supported on ZSM-22/ZSM-23 intergrowth zeolite catalyst

Hydroisomerization catalysts Pt/ZSM-22, Pt/ZSM-23, and Pt/ZSM-22/ZSM-23 were prepared by supporting Pt on ZSM-22, ZSM-23, and intergrowth zeolite ZSM-22/ZSM-23, respectively. The typical physicochemical properties of these catalysts were characterized by X-Ray Diffraction （XRD）, N2 absorption-desorption, Pyridine-Fourier Transform Infrared （Py-FTIR）, Transmission Electron Microscopy （TEM）, X-Ray Fluorescence （XRF）, Scanning Electron Microscopy （SEM） and NH3- Temperature Programmed Desorption （NH3-TPD）, and the performance of these catalysts in n-dodecane hydroisomerization was evaluated in a continuous down-flow fixed bed with a stainless steel tubular reactor. The characterization results indicated that the intergrowth zeolite ZSM-22/ZSM-23 possessed the dual structure of ZSM-22 and ZSM-23, and the catalyst Pt/ZSM-22/ZSM-23 had similar pores and weak acidity to Pt/ZSM-22 and Pt/ZSM-23 catalysts. Moreover, Pt/ZSM-22/ZSM-23 catalyst showed a high selectivity in hydroisomerization of long chain n-alkanes to mono-branched isomers. The evaluation results for n-dodecane hydroisomerization indicated that the activity of Pt/ZSM-22/ZSM-23 was the lowest, while the hydroisomerization selectivity was the highest among the three catalysts. The maximum yield of i-dodecane product was 68.3% over Pt/ZSM-22/ZSM-23 at 320 ℃.

SiO_2 AS HETEROGENEOUS NUCLEI OF INTERGROWTH EUTECTIC IN MODIFIED AS-CAST MEDIUM MANGANESE STEEL

By calculation of thermodynamics,analysis of crystal structure and study of TEM and eletron probe,it is first discovered that SiO2 can be acted as one of the heterogeneous nu- clei for lamellar intergorowth eutectic(austenite and cementite)crystallizing in modified as-cast medium manganese steel.

Chalcopyrite Intergrowths in Sphalerite in the Meixian Lead-Zinc Deposit, Fujian Province and Their Metallogenic Significance

Ore textures and electron microprobe analyses show that in addition to highly scattered blebs in sphalerite grains, intergrown chalcopyrite also occurs as reds, myrrmekites andlamellae aligned along cleavages and twin boundaries of the host sphalerite. The majority of theintergrowths could have been formed by replacement of sphalerite by chalcopyrite, albeit part ofthem may have resulted from exsolution. Not only copper, but also iron were introduced intothe sphalerite by replacive fluids.While the front of the replacing fluid was moving forward through a sulphide orebody, Znand Pb were dissolved and Cu was precipitated, resulting in zonal refining of the sulphide ores.The remobilized zinc and lead were precipitated at favourable sites with changed physiccrchemical conditions. This is a Possible mechanism for the formation of copper-poor zinc and lead oresabove or lateral to the copper orebodies in some of the massive sulphide deceits reworked andoverprinted by late-stage granites and their hydrothermal fluids.

Rainfall,Landslide and Debris Flow Intergrowth Relationship in Jiangjia Ravine

Jiangjia Ravine is a world-famous debris flow valley in Dongchuan,Yunnan Province,China.Every year large numbers of landslides and collapses happened and caused enormous damages to people's properties and lives.With longtime observation and testing in Jiangjia Ravine we had found out one kind of special landslide which had the characteristics of landslide and collapse.Landslide and collapse supplied sufficient materials for debris flow.When a debris flow broke out,some kind of intergrowth existed among rainfall,landslide and debris flow.In order to study the intergrowth and some key parameters,we carried out artificial rainfall landslide tests and model experiments to observe the phenomena such as collapse,surface slide and surface flow.By observing the experimental phenomena and monitoring water contents,the transformation process among landslide deposits and debris flow under the condition of rainfall had been analyzed.Research results revealed the relationship of this kind of intergrowth among rainfall,landslide and debris flow in Jiangjia Ravine.Meanwhile,it was found that this kind of intergrowth relationship existed only when the moisture content was in a certain range.That is,the critical state seemed to be existed in the transformation process.

Syntactic Intergrowth Structure in the Calcium-Rare Earth Fluorocarbonate Minerals

The microstructural characteristics of syntactic polycrystal in the calcium rare earth fluorocarbonate minerals from Southwest China have been studied by means of selected area electron diffraction and high resolution electron microscopy(HREM). The complication of the heterogeneous fabric of the minerals have been revealed by HREM. The results show that the crystal structure of the minerals was formed by a disorder stacking of the unit layers of bast naesite and synchisite in the calcium rare earth fluorocarbonate minerals along c direction. The stacking fault and other crystal defects in the syntactic polycrystal have been discussed.

High Yield and Efficient Cultivation Techniques of Rice under Rice- fish Intergrowth Model in Chengdu

The integrated planting and breeding of paddy fields is a kind of eco-planting and breeding mode which makes rice and aquatic animals benefit from each other,greatly reducing the harm of rice pests and diseases,using less or even no fertilizers or pesticides,greatly reducing the agricultural non-point source pollution,thus achieving the " multiple use of water,multiple harvests in one field,grain and fishing winwin,ecological and high efficient use. " In this paper,the high yield and efficient cultivation techniques of rice under the rice-fish intergrowth model in Chengdu was introduced from the aspects of selecting good paddy fields for fishing,using appropriate rice varieties,soaking disinfection,timely sowing and nurturing strong seedlings,reasonable close planting,reasonable fertilization,scientific water management,scientific pest control and rice harvests.

交融互渗与共生发展:大运河流域文化景观特征及其实践路径

随着京杭大运河列入“世界文化遗产名录”,它逐渐引起社会各界和不同研究领域学者的关注。大运河沟通南北,贯通不同区域、民族文化;运河研究只有立足于流域,才能更好地理解其所彰显的文明互鉴与文化交流。在大运河流域文化遗产的保护中,文化景观进一步丰富、发展,但其并非均质化、同质性的,在文化景观的转换中既有创造性转化,也有消耗性转化,基于此可将其分为:实用性向功能性转变,集功能性与象征性为一体,叠加实用性、功能性及象征性等多个类型。大运河流域的文化景观并非孤立存在,而是“兼和相济”“互补共生”,在“存有交互性”中融合为一个整体,对其阐述须立足于此,才能更好地理解这些文化景观的“流域”共性及“人—地—水”的互渗交融。大运河流域文化景观的建构与实践则需要坚持以“人”为核心,努力探索“差异互补”“互联互融”“求同存异”的共生之路。

细粒氯化钠对光卤石分解结晶过程的影响研究

以细粒高钠光卤石为原料,研究光卤石中的细粒氯化钠对氯化钾品位的影响,并探讨其原因。实验结果表明光卤石中含有的细粒NaCl会严重降低KCl品位,细粒NaCl浮选夹带不是导致KCl品位降低的主要原因。溶解速率实验结果表明,光卤石中的细粒NaCl溶解速度较快,溶液中NaCl浓度很快达到较高值,随溶液MgCl_(2)浓度不断升高,新生NaCl晶体析出量增加,NaCl和KCl之间的共生晶体数量增加,新生KCl和NaCl晶体之间的共生现象是导致KCl品位降低的主要因素。

某低品位磷矿工艺矿物学研究

以清平磷矿为研究对象,利用矿物参数自动定量分析系统(AMICS)、扫描电子显微镜-能谱仪(SEM-EDS)、X射线衍射(XRD)、偏光显微镜和激光剥蚀-电感耦合等离子体质谱仪(LA-ICP-MS)等测试手段,对该矿的化学元素组成、矿物组成及含量、粒度特征、单体解离情况及连生关系等进行了研究,结果表明:矿石中主要有用矿物为胶磷矿,为非晶质结构或显微隐晶质结构;主要脉石矿物为白云石,次要脉石矿物为石英、黄铁矿,同时含有少量硫磷铝锶石和磷铝钙石;该矿石需要通过选矿的方法脱除白云石以富集磷灰石;胶磷矿与微细粒脉石矿物共生、P_(2)O_(5)品位低(12.05%)是影响磷灰石分选富集的主要不利因素。研究结果对该矿石的分选工艺流程制定具有一定的指导意义。

Research on Dong Zhongshu’s Five Elements Thought

Dong Zhongshu reordered the Five Elements,that is,wood,fire,soil,gold,and water,and believed that this was the order given by heaven and could not be changed.The Five Elements are related to each other.The relationship between the two adjacent to each other is the relationship of generation and father-son;the relationship between the two separated is reciprocal.The soil is in the middle,and the soil has the noblest morality.Therefore,Dong Zhongshu’s view of“Filial piety is natural”originates from the father-son relationship between the Five Elements and the nobility of soil virtue.According to the Five Elements,the state management should set up five kinds of official posts in order to achieve the purpose of interdependence,mutual restriction,balance,and promotion.Dong Zhongshu matched the Five Elements with the four seasons,and believed that each of the Five Elements had its own virtues,and thus extended it to the virtues of the monarch.Dong Zhongshu linked the Five Elements with the five things,thinking that the five things of the king will affect the Five Elements;the five things are appearance,speech,sight,listening,thinking,which is given by heaven.To govern the country and the people the king must have five important cultivations.

云南稻-鸭共生模式效益的研究及综合评价(三)

通过不同放鸭只数的试验,研究了在中高产田单位面积放鸭的数量与产量构成因素和病虫草害发生的关系,分析了产量构成,病虫草害发生的情况,为稻-鸭共生模式技术的推广提供理论依据。

湿地稻-鸭复合系统中水稻纹枯病的变化规律

为了探明稻田养鸭对水稻纹枯病的发生、发展的影响 ,为稻 -鸭复合系统中水稻纹枯病的防治提供依据 ,笔者在中稻、晚稻田进行了稻田养鸭试验。试验结果表明 ,在中稻田每 6 6 6 .7m2 放养体重 15 0 g左右鸭子 15～ 2 0只 ,能使纹枯病病蔸率减少5 6 .0 % ,病株率减少 5 7.74 % ,同时比用井岗霉素防治的小区病蔸率下降 9.0 % ,病株率下降 15 .2 5 % ,病情指数比空白对照下降2 6 .4 6 ,比施用井岗霉素的施药区减少 0 .95 ;防治效果显著 。

稻田养鸭对稻飞虱的控制作用

为了探明稻田养鸭对水稻病虫害的控制作用,于2003年4至11月在湖南省桃江县建立稻田养鸭试验示范区.研究结果表明,在中稻田,放鸭区第四代、第五代稻飞虱百蔸虫量较空白区虫量下降70.2%和72.4%;晚稻田养鸭区第四代、第五代稻飞虱虫量较空白区下降56.2%和64.7%,表明稻鸭共栖对稻飞虱起到了稳定、持久的控制作用.放鸭区不需用药防治稻飞虱,经济效益明显.

煤炭与其它矿物共生、伴生矿区循环经济体系建立的探讨

建立了煤炭及其它矿物共生、伴生矿区循环经济体系模型,进一步对体系构筑、矿物开采加工顺序、加工情况、产品流向进行分析,提出建立八大产业链体系,对矿物进行就地开采、就地加工、就地处理、就地利用,对副产品及废弃物集中收集、集中处理、综合利用的观念,同时,建立了一套分析、控制指标体系和模型.

拉长石晕彩与内部结构的关系

为了研究拉长石晕彩与其内部结构的关系，采用Philips CM12型透射电镜结合矿物薄片，对拉长石样品的不同颜色区域进行了观察。对晕彩效应成因的研究结果表明，拉长石的晕彩效应是典型的干涉型晕彩，内部的出溶连生结构是导致拉长石产生晕彩的根本原因。只有当连生片晶的厚度为128-252nm时，拉长石才能产生可见光范围内的干涉色。由于连生片晶不是绝对平行，表面也并不完全平坦，导致所显现的干涉色不是单一颜色。为了更好地显现晕彩，宝石的切磨方向应与内部出溶连生结构的方向尽量一致，宝石表面与连生片晶的夹角越小，观察到晕彩的方向就越正，当夹角大于45°后，样品表面就观察不到晕彩了。晕彩的颜色受出溶条纹厚度的影响，条纹组的单元层厚度越大，干涉色波长越长；两组条纹的厚度比越大，干涉色波长越长；据此建立了晕彩拉长石的内部结构模型。

西藏蛇绿岩中硅铁合金组合及成因探讨

在雅鲁藏布江蛇绿岩带的东端罗布莎蛇绿岩的铬铁矿中发现不寻常的硅铁合金组合。 4种硅铁合金的理论分子式分别为Fe0 .84 Si2 .0 0 (Fe3 Si7)、Fe7Si3 、Fe6Si4 以及Fe4 Ti3 Si2 P。这些合金均选自铬铁矿石的人工重砂中 ,在少数颗粒中见到由 3种硅铁合金组成的交生结构 ,明显表明这些合金的同生和同成因性。推测它们为化学反应成因 ,来自于核幔边界地带。