新型含1H-吡唑的新型双杂环化合物的合成

以乙酰乙酸乙酯和芳甲酰氯为原料，合成相应的β-酮酸酯，在乙醇钠／碘的作用下实现二聚偶联反应得到1，4-二酮化合物，然后与水合肼反应，得到两个新型含1肺吡唑的双杂环化合物，其结构经’HNMR、Ms及IR证实。     

CATIA modeling method of ship hull with hull line as data input北大核心CSCD

[Objective]To simplify the ship modeling process and improve modeling efficiency, this paper proposes a method for rapidly implementing hull model creation based on hull line drawing.[Methods]Using the CATIA platform, this method adopts the component application architecture (CAA) development tool for secondary development. First, by reading the geometry elements and label information of the hull lines in a drawing, the transformation of the offset points from 2D to 3D is realized. On this basis, the creation of the hull lines, stern and bow is completed, and a 3D wireframe model obtained. Finally, the hull 3D modeling is completed in conjunction with the CATIA native surface creation command. The stability and reliability verification of the developed type value extraction and bow generation program is then carried out via application analysis.[Results]The results show that the compiled program can realize the automatic creation of offset points, transverse lines, waterlines, profile lines and other boundary lines except the top line of the wall, and the centerline and tangent lines created by the bow generator are easily modified and simple for users to operate. [Conclusions]The verification results show that the method of a creating hull model using "Generative Shape Design" and "Drafting" with the hull line drawing as the data input is stable, reliable and able to realize rapid hull modeling, giving it certain practical value. © The Author(s) 2022.     

高压气囊工艺在沉箱码头施工中的应用

高压气囊顶升、拖运巨型沉箱工艺与传统的千斤顶、台车工艺相比，在工艺设备、经济成本、施工技术等方面具有较大的优越性；在自身浮游不稳定、吃水深度较大的巨型沉箱中的应用，更是扩大了气囊的应用范围，解决了浮船坞下潜深度不足的难题。     

Systematizing international benchmarking for ports

The subject of port efficiency is one of the important issues facing port authorities and policy makers today. A number of studies have been undertaken which compare ports in terms of their efficiency. But any port comparison can only be valid and meaningful if a port's efficiency is compared with a similar port. The principal objective of this paper is to introduce a systematic approach to identifying similar ports based on the technique of principal component analysis. Secondly, it seeks to identify the most important factors underlying the port classification. Lack of awareness of which factors differentiate ports has resulted in an unnecessary collection of data which are of limited use in port classification. This study has identified three groupings of similar ports within which port comparison can be justifiably made. This approach can be used for any future port comparison and can be applied to other areas of activity facing the same difficulty.     

铁路货车防盗系统设计

针对铁路运输的货物在途中被盗现象，提出了货车、集装箱防盗系统的设计原理，给出了系统硬件结构示意图和软件设计框图并对其在 Ｔ Ｍ Ｉ Ｓ中的使用前景进行了展望。     

The Port of Melbourne Authority's pricing policy: its efficiency and distribution implications

The objective of this paper is investigate the extent to which the new (revised) pricing policy has improved the level of efficiency at the Port of Melbourne and to assess the contributions of the underlying factors of port efficiency. Further, it attempts to examine the distribution implications of the pricing policy between the major port users (i.e. shipowners and shippers) and its revenue implication for the Port of Melbourne. Using a conceptual framework derived from economic theories, in-house data and responses from the port users, the study reveals that the efficiency impact has been considerable and varied between berths; land transport links and crane productivity improvements were the major factors of the port's overall efficiency; the initial losers have been the shipowners and initial gainers the shippers; however, the gains have been limited and in some cases have been offset by the introduction of higher port service charges; in the long run it is likely that the shipowners and shippers' situations will be unchanged while the Port of Melbourne will lose revenue due to improvements in berth productivity uncompensated by greater traffic volume.     

Testing probabilistic discrete choice models of travel demand by comparing predicted and observed aggregate choice shares

Probabilistic discrete choice models of travel demand often are tested for the presence of specification errors by comparing the models' predictions of aggregate choice shares in population strata with observed shares. A model is rejected as misspecified if the differences between its predictions and the observations are judged too large. This judgement usually is made on intuitive grounds without use of formal statistical methods and, therefore includes no systematic method for distinguishing the effects of specification errors on differences between predictions and observations from those of random sampling errors. This paper represents formal statistical tests for comparing predicted and observed aggregate chioce shares in population strata and reports the results of an investigation of the power of the tests. The test statistics are asymptotically χ² disturbed when the model being tested is correctly specified. The results of the power investigation suggests that greater power is obtained (i.e. there is ability to detect misspecified models) when all of the available data are used for both parameter estimation and specification testing than when the available data are divided into separate estimation and test data sets. Specification tests based on comparisons of predicted and observed aggregate choice shares appear to have less power than do likelihood ratio and likelihood ratio index specification tests when the alternative models required by the latter tests are correctly or approximately correctly specified. However, tests based on comparisons of predicted and observed shares ca have greater power than the other tests when the alternative models are seriouslymisspecified.     

Assimilation of buoy and satellite data in wave forecasts with integral control variables

The quality of numerical wave forecasts can be improved significantly by assimilating wave observations prior to the forecast. In the present study a technique for such assimilation is developed that exploits (a) the efficiency of a limited number of integral control variables, and (b) the effectiveness of variational (model-consistent) assimilation. The formal procedure is independent of the type of control variables and of the wave model (moreover, no adjoint wave model is required). In the present study, integral control variables are chosen to represent large-scale errors in the driving wind fields and uncertainties in the wave model. The assimilation technique is validated with observations of the ERS-1 satellite altimeter and two waverider buoys in two consecutive storms in the Norwegian Sea. The assimilation of the observations reduced the errors in the forecasted significant wave height at the buoy locations typically from 25% to 12%. For low-frequency waves the effect of the assimilation is similarly significant at one buoy location but marginal at the other buoy location.     

New species of the genus Xanthocalanus (Copepoda, Calanoida, Phaennidae) from the Laptev Sea

Sampling of the near-bottom calanoid copepods was performed on board of the research vessel Polarstern in 1993 in the Laptev Sea (Siberian Arctic). Three new species of Xanthocalanus were identified as such, and are described and figured here: X. spinodenticulatus sp. nov., X. laptevorum sp. nov. and X. polarsternae sp. nov.