内蒙古达斡尔族群体9个X-STR位点的遗传多态性及法医学应用价值评估

目的研究内蒙古达斡尔族群体9个X-STR位点(DXS6789、DXS101、DXS8378、DXS7132、DXS7133、DXS7423、DXS6804、DXS6799、HPRTB)的多态性分布及法医学应用价值。方法抽取内蒙古达斡尔族87名健康无关个体静脉血,提取DNA,经PCR扩增、变性聚丙烯酰胺凝胶电泳及银染显色技术进行等位基因分型;采用SPSS13.0软件计算各位点基因型频率和等位基因频率,并检验等位基因分布差异有无统计学意义;Genepop软件进行Hardy-Weinberg平衡检验;Fstat软件计算基因多态性、固定指数并检验固定指数偏离平衡的程度;Powerstats软件计算各种法医学应用指标。结果获得内蒙古达斡尔族群体9个X-STR位点等位基因频率分布的数据;进一步检验获得9个X-STR位点中DXS7133位点的多态性和分化程度较低;DXS7423和DXS7132位点在不同民族中基因分布差异无统计学意义。结论9个X-STR位点中,DXS6789、DXS101、DXS8378、DXS7132、DXS7423、DXS6804、DXS6799、HPRTB 8个位点有较高的遗传多态性和个体识别率,在个体识别和女孩的亲权鉴定中有较高应用价值,对疾病相关研究有实际意义。     

The impact of muddy bottoms in ports

Ports are drivers of regional and of countries’ economic development. Most ports are built close to coastlines, where waters are shallower and tend to suffer from deposit sedimentation processes, which reduce depths in operational areas. In presence of shallow waters and sedimentation, ports must decide whether to dredge or not, where both decisions have significant impacts on ports’ annual incomes. Nevertheless, there are seabeds, namely muddy bottoms, in which vessels can navigate with a safety degree. This paper aims at investigating the extent to which the theoretical knowledge of vessel’s control in muddy waters is valid at a certain nautical bottom, as defined by the Permanent International Association of Navigation Congresses (since 2009 the World Association for Waterborne Transport Infrastructure but the acronym stays PIANC) and its impact on port economics. To achieve the proposed objective, an email survey was sent to worldwide pilots that manoeuvre ships in muddy waters. The survey validated the theoretical knowledge, showed that navigation in muddy waters is possible, that it can contribute to reduce ports’ operational costs, and that the subject can be rather controversial.     

PB位相相干态的振幅平方压缩特性

研究了ＰＢ位相相干态的振幅平方压缩特性。结果表明，对于ｓ〉４的ＰＢ位相相干态均可存在振幅平方压缩特性，并给出了振幅平方压缩条件。     

ALTERATION IN CONTRACTILE RESPONSE TO NORADRENALINE,5-HYDROXYTRYPTAMINE, SARAFOTOXIN 6c, AND ANGIOTENSINⅡ IN RAT MESENTERIC ARTERY DURING ORGAN CULTURE

Theresistanceinindividualvascularbedsdeter minesthelocaldistributionofbloodflowtoandwithindifferentorgans.Thecontractilestateofanarteryiscontrolledbymediatorsreleasedlocallyfromnerveterminalsandendothelialcells ,andbycirculatinghormones .Thesemediatorsgiverisetoeffectsthroughtheirreceptors .Mediatorscanaffectvascularsmoothmuscleei therdirectly ,byactingonthesmoothmusclecellsthemselves ,orindirectly ,byactingonendothelialcellsoronnerveterminals ,especiallythoseofthesympatheticnervoussystem .Som…     

State Wetland Protection: A Matter of Context?

Models of integrated management emphasize the role of the surrounding socioeconomic and political environment in influencing management choices for natural resources. In this study, we explore a model that examines the influence of socioeconomic and political variables on the wetland management programs of U.S. states. Logistic regression was used to identify environmental, socioeconomic, and political variables that explained variation in state wetland programs. The likelihood of strong planning, nonregulatory, regulatory, and overall programs increases as the importance of fisheries in the state increases (p < 0.05), but decreases as population density increases (p < 0.15). Furthermore, there is an increasing likelihood of stronger regulatory and overall programs as environmental group activity and industry importance increases (p < 0.05). These findings provide empirical evidence to support the contention that management approaches used in one state often must be adapted to fit the realities of another given state.     

The influence of panel effects and inertia on travel cost elasticities for car use and public transport

Transportation - Studies on the impact of changes in travel costs on car and public transport use are typically based on cross-sectional travel survey data or time series analysis and do not...     

An optical tire contact pressure test bench

An optical tire contact pressure test bench developed by the IMMa group is described. The measurement system is based on the frustration of total internal reflection (FTIR) of light. The test bench allows performing normal pressure distribution and patch contact shape measurements on passenger car tires. The system is based on the use of a laterally illuminated glass on which the tire leans. Between them a plastic interphase is located that will cause the FTIR of light. A video camera catches the formed shining image through the glass. The brightness level in each pixel of the image can be related to the existing normal pressure. The study of the contact patch provided by the bench makes it possible to characterize tire behaviour under different loading states, inflation pressure, tire defects and toe and camber angles. The bench incorporates a computerized load and control system of the tire operation parameters, an image acquisition module and a data acquisition system that allow monitoring and acting on the experimental variables of interest in the tests such as load on the tire and environmental conditions. A supporting mechanical system incorporated to the bench allows providing the tire with variable toe and camber angles. From the images obtained with this system, the maximum normal pressure points, total force, size and shape of the patch can be determined, which are related to the tire-use conditions. As an application example, results that show the patch size and shape under different load and tire inflation pressures are presented. A further application, which is the use of the system for the detection and study of defective tires is also presented.     

Contributions to maritime economics—Zenon S. Zannetos,the theory of oil tankship rates

This paper discusses the importance of Zannetos’ 1966 book for the development of maritime economic thought. The main contributions of the book are recounted, and the empirical work in the book is reviewed.

The analysis of the present paper is a citation research on the maritime economics literature that refers to the book. Of the 42 papers in the set, about one-third refers to the book in general. A total of 35 papers refer to one or more elements of the book, with an equal number of references to: (1) the term structure of freight rates; (2) the empirical findings on the form of the supply curve; and (3) on the verification of his results.

The general conclusion of the citation analysis is that, apparently, a number of elements of his work are still very valid for current maritime economics thinking, while maritime economists have disregarded several other elements. The latter seems unjustified for some of the business structure observations that are made in the book, such as the notion that the ship is the firm, and the elasticity of expectations. The former observation is the basis for virtually all empirical work in maritime economics that is based on individual contract data (all freight rate analysis is of this nature), and the second is the basis for the analysis of investment behaviour in shipping, investigations of cyclicality and so on.

Zannetos can definitely be seen as the initiator of the important field of term structure analysis in maritime economics. In addition to this, there are several topics in the 1966 book that are as yet unexplored, and deserve empirical scrutiny.     

冷塑性变形对γ─FeMnAlCr反铁磁合金电学性能的影响

研究了塑性变形对γ─ＦｅＭｎＡｌＣｒ反铁磁合金电学性能的影响．结果表明，随形变量增加，γ─ＦｅＭｎＡｌＣｒ合金的室温电阻率和剩余电阻率先下降，后增加，在形变量４．８９％处存在电阻率的极小．合金在Ｎｅｅｌ温度（ＴＮ）以上的平均电阻温度系数（ＴＣＲ）随形变而增加，在ＴＮ和电阻极小值温度（Ｔｍｉｎ）之间ＴＣＲ变化不大，而在Ｔｍｉｎ～室温之间ＴＣＲ有明显减小．试验还发现塑性变形对γ─ＦｅＭｎＡｌＣｒ合金的应力灵敏系数影响不大．试验结果表明，γ─ＦｅＭｎＡｌＣｒ合金可能存在某种程度的成分偏聚．