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。

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.

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.

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.

INTERGROWTH-21^(st)标准结合主动脉峡部血流参数评价晚发型胎儿生长的影响

目的:探讨INTERGROWTH-21^(st)标准结合主动脉峡部血流参数评价晚发型胎儿生长受限(FGR)的意义。方法:选取九江学院附属医院2020年1月至2023年1月在进行常规产前检查并入院分娩的100例孕妇为研究的对象,根据孕产妇的分娩结局分为正常胎儿组(88例)和晚发型胎儿生长受限组(12例),所有孕产妇均行彩色多普勒超声检测胎儿主动脉峡部血流指数(IFI)及峡部收缩指数(ISI),并以超声监测相关参数,包括双顶径(BPD)、头围(HC)、股骨长(FL)、腹围(AC)等;分别以INTERGROWTH-21^(st)公式与INTERGROWTH-21^(st)公式结合主动脉峡部血流参数对胎儿体重进行预测,比较两种方式对FGR的预测准确性。计量资料以均数±标准差(±s)表示,采用t检验,计数资料以率(%)表示.采用χ^(2)检验。结果:本组100例孕妇分娩结局,88例为正常胎儿,12例为FGR。正常组胎儿体质量及新生儿Apgar评分(3.591±0.420,1.643±0.420),晚发组胎儿体质量及新生儿Apgar评分(8.260±1.500,6.760±1.812),两组间差异有统计学意义(χ^(2)=4.561,P<0.05)。正常组胎儿双顶径为(8.320±0.790)cm,头围为(29.460±5.780)cm,股骨长为(70.126±6.831)cm,腹围为(30.641±3.290)cm,晚发组胎儿双顶径[(7.122±0.218)cm],头围[(23.141±2.800)cm],股骨长[(62.430±4.780)cm],腹围[(28.414±2.780)cm]直径均值低于正常组,差异有统计学意义(χ^(2)=18.923,P<0.05)。晚发型FGR组胎儿主动脉峡部舒张期血流消失或反向发生率42.25%(5/12),高于对照组13.40%(1/12),差异有统计学意义(χ^(2)=2.110,P<0.01)。INTERGROWTH-21^(st)标准结合主动脉峡部血流参数对FGR预测的准确性为92.0%(92/100),单纯INTERGROWTH-21^(st)标准对FGR预测的准确性为81.0%(81/100),两者差异有统计学意义(χ^(2)=5.181,P<0.05)。结论:INTERGROWTH-21^(st)标准结合主动脉峡部血流参数评价FGR中的作用显著,有助于评价晚发型胎儿生长受限。

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。

Intergrowth mechanism and morphology prediction of faceted Al_(3)Ni formed during solidification by a spatial geometric model

The interplay and intergrowth characteristic of faceted intermetallic compounds(IMCs)during solidification was originally investigated through the rod-like Al3 Ni crystals in the liquid Al/solid Ni interconnection by using synchrotron radiography,and the diversified 3-D morphologies were reconstructed by synchrotron tomography.A spatial geometric model was established to effectively predict the diversified growth patterns of two spatial crystals.For the two overlapping Al3 Ni crystals,the impeded crystal growth was divided into three different stages,decided by the hindrance form the other crystal.Further,the groove formed on the crystal surface is directly related to the solute redistribution under the critical condition of boundary layer thickness larger than two crystals distance.The closer distance and smaller crystal size indicate the deeper and larger groove,and the morphology changes from hemispheroid to hemi-ellipsoid with the increased opposite and interacted faces.

Block-layer model for intergrowth structures

Lattice match and charge transfer between distinct block layers(BLs)play an important role in the formation of an intergrowth structure.Herein we propose a simple BL model addressing the different roles of the lattice match and the charge transfer.Inter-BL charge transfer lowers the internal energy,while lattice match minimizes the elastic energy,both of which together make the intergrowth structure stabilized.The model is able to reproduce the lattice parameters precisely for complex iron-based superconductors with intergrowth structures.The elastic energy and the charge-transfer energy are evaluated with assistance of the first-principles calculations.This work rationalizes the basic principles of BL design for intergrowth structures,which can be utilized not only for finding new superconducting materials but also for investigating other layered materials with various functionalities.

高频层序划分揭示断陷深湖层系源储共生发育规律——以北部湾盆地海中凹陷始新统流沙港组二段为例

以北部湾盆地海中凹陷始新统流沙港组二段断陷湖盆深湖沉积体系为例,以高分辨率层序地层学理论为指导,利用最大熵谱分析与小波变换分析技术对流二段进行高频层序划分,在对沉积体系发育规律分析的基础上,通过流二段各五级层序深湖相烃源岩及湖底扇重力流相砂岩发育规律的分析,探讨断陷湖盆深湖层系源储共生的发育规律。研究认为:INPEFA频谱分析与小波变换分析技术可有效地运用于断陷湖盆深湖层系高频层序划分;北部湾盆地海中凹陷深湖层系流沙港组二段可划分为1个三级层序、2个四级层序、5个五级层序,其中2个四级层序以最大湖泛面为界分为湖泊扩张体系域(TST)与湖泊收缩体系域(HST);断陷湖盆优质厚层烃源岩往往发育于湖泊扩张体系域四级层序下部初始湖泛面(Ts)的五级层序内,虽然湖泊扩张体系域四级层序顶部最大湖泛面(Mfs)上下紧邻的五级层序发育的烃源岩面积大,但厚度小,为次要烃源岩及良好的盖层;湖泊扩张体系域四级层序中部的五级层序往往发育湖底扇重力流相储层,其夹持发育于初始湖泛面及最大湖泛面附近的两套烃源岩之间,可共同组成良好的“三明治”式生储盖组合,该套“三明治”式生储盖组合应是下一步非常规油气勘探的重要区域。

TOPOTACTIC INTERGROWTH OF LONGQUAN MAGNESIOAMPHIBOLE

Ⅰ. OCCURRENCE AND GENERAL FEATURES OF LONGQUAN MAGNESIOAMPHIBOLEThe magnesioamphibole studied in this note was sampled from peridotite block in Longquan tectonic melange zone of Zhejiang Province, China. It appears in bunchy or fibrous aggregates around the block. The length of the crystal ranges from several mm to about 1 cm. It presents inchned extinction with cANg= 10°—13°under crossed polars. According to the observation of thin sections, it is known that olivine, tale and serpentine

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。

Nano-scale compositional oscillation and phase intergrowth in Cu_(2)S_(0.5)Se_(0.5) and their role in thermal transport

Solid solution alloying is a promising strategy to establish high performance thermoelectrics.By alloying different elements,phase structures and phase compositions may vary accompanied by appearance of variety of interesting microstructures including mass fluctuation,lattice strain,nano-scale defects and spinodal decomposition,all of which may greatly influence the electrical and specifically the thermal transport of the material.In the present study,atomic structures of Cu_(2)S_(0.5)Se_(0.5) solid solution have been examined by using atom-resolved electron microscopy in order to investigate the structure-correlated physical insights for the abnormal thermal transport in this solid solution.Then the exceptional intergrowth nanostructures were observed.The solid solution consists of two high symmetrical phases,i.e.the hexagonal and cubic phase,which alternately intergrow to form highly oriented ultra-thin lamellae of nano or even,unit cell scales.The compositional oscillation in Se/S atomic ratio during alloying is responsible for the phase stability and intergrowth nanostructures.The unique binary phase intergrowth nanostructures make great contribution to the ultra-low lattice thermal conductivity comparable to glass and extremely short phonon mean free path of only 1.04Å,peculiar continuous hexagonal-to-cubic structural transformation without a critical transition temperature and its corresponding abnormal changes of thermal characters with temperatures.The present study further evokes the unlimited possibilities and potentials for tailoring nanostructures by alloying for improved thermoelectric performance.

Intergrowth texture in Au-Ag-Te minerals from Sandaowanzi gold deposit,Heilongjiang Province:Implications for ore-forming environment

Sandaowanzi gold deposit,Heilongjiang Province,is the only single telluride type gold deposit so far documented in the world,in which 90% of gold is hosted in gold-silver telluride minerals.Optical microscope observation,scanning electron microscope,electron probe and X-ray diffraction analysis identified abundant intergrowth textures in the Au-Ag-Te minerals,typified by sylvanite-hosting hessite crystals and hessite-hosting petzite crystals.The intergrown minerals and their chemistry are consistent,and the hosted minerals are mostly worm-like or as oriented stripes,evenly distributed in the hosting minerals,with clear and smooth interfaces.These suggest an exsolution origin for the intergrowth texture.With reference to the phase-transformation temperature derived from synthesis experiments of tellurides,the exsolution texture of Au-Ag-Te minerals implies that the veined tellurides formed at 150-220℃.The early stage disseminated tellurides formed at log f(Te 2) from 13.6 to 7.8,log f(S 2) from 11.7 to 7.6,whereas the late stage veined tellurides formed at log f(Te 2) ranging from 11.2 to 9.7 and log f(S 2) from 16.8 to 12.2.

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。

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.