超声诊断胎儿双侧尺桡骨缺如并脐带囊肿1例

目的探究与分析超声诊断胎儿双侧尺桡骨缺如并脐带囊肿。方法选取我院进行畸形胎儿方面产检的孕妇1例作为研究对象,对其进行超声检查,分析孕妇腹中胎儿畸形的发生情况。结果孕妇腹中胎儿的超声诊断结果为胎儿双侧尺桡骨缺如并脐带囊肿。结论超声检查在诊断胎儿双侧尺桡骨缺如并脐带囊肿方面具有早发现、早诊断、早治疗等积极作用,其操作准确、方便、经济、实时、无创伤,可以提高我国人口素质,降低出生缺陷率。

文明生财

“和气生财”早已成为我国广大人民群众熟知的格言,但“文明生财”则没被重视更没形成共识。无数事实充分证明,文明可以生财。 文明和财富是社会发展的必然要求,两者相互促进,协调发展。

天津商品房买卖出现面积纷争现象

因怀疑经营者在商品房销售中虚标建筑面积而引发的矛盾和冲突,最近在天津市呈日益增多的趋势。“3.15”前夕,就此问题到有关部门和新闻单位反映和投诉的,每天在10起左右。

Role of matrix structure and flaw size distribution modification on deflection hardening behavior of polyvinyl alcohol fiber reinforced engineered cementitious composites(PVA-ECC)

The multiple cracking and deflection hardening performance of polyvinyl alcohol fiber reinforced engineered cementitious composites(PVA-ECC)under four-point flexural loading have been investigated.Matrices with different binder combinations and W/B ratios(from 0.44 to 0.78)providing satisfactory PVA fiber dispersion were specially designed.Effect of pre-existing flaw size distribution modification on deflection hardening behavior was comparatively studied by adding 3 mm diameter polyethylene beads into the mixtures(6%by total volume).Natural flaw size distributions of composites without beads were determined by cross sectional analysis.The crack number and crack width distributions of specimens after flexural loading were characterized and the possible causes of changes in multiple cracking and deflection hardening behavior by flaw size distribution modification were discussed.Promising results from the view point of deflection hardening behavior were obtained from metakaolin incorporated and flaw size distribution modified PVA-ECCs prepared with W/B=0.53.The dual roles of W/B ratio and superplasticizer content on flaw size distribution,cracking potential and fiber-matrix bond behavior were evaluated.Flaw size distribution modification is found beneficial in terms of ductility improvement at an optimized W/B ratio.

Computational Study of the A0 Scattered Field Due to an Edge Delamination

Delamination detection presents a pertinent problem for SHM be no visible signs of the damage on the surface of the structure. （structural health monitoring）, as in most cases, there may This study investigates the scattering of a zeroth-order anti-symmetric （A0） Lamb wave mode by an edge delamination using the commercial FE （finite element） package ABAQUS. The Ao Lamb mode is chosen because the corresponding stress distribution is more sensitive to delamination than is the case for symmetric modes. The paper presents results for the scatter field for various angles of incidence, and for varying defect sizes. The regime of small defect size relative to the incident wavelength is of particular interest for SHM as it corresponds to early damage detection. It is shown that, in this regime the scattered field appears to originate from a point source at the origin of the delamination, and the corresponding amplitude is linearly proportional to area of the delamination. These results can be used to guide the use of Lamb waves to detect and quantify edge delamination in plate-like structures.

加强对个体户的社会主义职业道德教育

我国现阶段,在发挥个体经济和私营经济积极作用的同时对其可能产生的资本主义自发倾向,也要注意加以限制,加强管理和教育。其中一个重要方面,就是要加强对他们的社会主义职业道德教育。 个体经济对整个国民经济起到必要的和有益的补充作用,个体户用诚实劳动和文明行为获得了社会信誉。但是,应当看到,在个体户中确实存在着一些害群之马,他们缺乏社会主义职业道德,干出了不少违背社会主义道德原则的“缺德”事,有的甚至跌入犯罪的泥坑。

A biomechanical investigation on the incorporation of cortical allograft in rabbit ulna defects

To explore the changes of biomechanical properties of cortical allograft in different mechanical environments. Methods: Cortical allograft was transplanted to each side of the midshaft diaphyseal ulna of each one of 40 rabbits. The left transplanted allograft underwent normal physiological load, while the right one underwent lower load. After animals were killed,specimens were taken for examination of bone mineral density, bone porosity and maximal three-point-bend breaking load. Results: The union strength of allograft-host bone junction was increased constantly; meanwhile, the internal creeping substitution led to an initial greater weakening of the cortical allograft itself and a later recovery of its strength. In comparison, the union strength of the normally loaded graft-host bone construct was significantly higher than that of the lower loaded side at the 8th and 16th week after transplantation. At the 16th week, there was greater bone strength in normally loaded graft than that in lower loaded graft. Conclusions: The internal repair can lead to initial greater weakening of cortical allograft and later gradual recovery of its strength. The effect of physiological load can accelerate the improvement of the biomechanical properties of allograft.

Olivine versus peridotite during serpentinization:Gas formation

The dependence of starting materials and their initial grain sizes on the formation of gases （H2, CH4, C2H6 and C3Hs） during serpentinization was investigated by conducting hydrothermal experiments at 311℃ and 3 kbar on olivine and peridotite with initial grain sizes ranging from 〈30 to 177 μm. Hydrocarbons （CH4, C2H6 and C3H8） were produced from reaction between dissolved CO2 in the starting fluids and HE formed during serpentinization, which were analyzed by Gas Chromatography. It was found that olivine serpentinization produced much less H2 and CH4 compared with those after peridotite alteration, while their C2H6 and C3H8 were identical. For example, for olivine with initial grain sizes of 〈30 μm, the amounts of HE and CH4 were 79.6 mmol/kg and 460 μmol/kg after 27 days, respectively. By contrast, the quantities of H2 and CH4 produced in experiment on peridotite with the same run duration were much larger, 119 mmol/kg and 1300 μmol/kg, respectively. This indicates that spinel and pyroxene in peridotite may increase the amounts of HE and hydrocarbons, possibly due to the catalytic effect of aluminum released by spinel and pyroxene during serpentinization. Moreover, the production of H2 and hydrocarbons is negatively correlated with initial grain sizes of the starting material, with smaller amounts of HE and hydrocarbons for larger initial grain sizes, indicating that the kinetics of serpentinization influences the formation of HE and hydrocarbons, possibly because of the lack of catalytic minerals for the starting material with larger grain sizes. This study suggests that olivine cannot completely represent peridotite during serpentinization, and that H2 and hydrocarbons in hydrothermal fields near the mid-ocean ridge may be produced in a very long period of serpentinization or the presence of catalytic minerals due to large grain sizes of ultramafic rocks.