Patterns of transition. Female native Dutch and ethnic minority employment patterns in the Dutch labour market, 1991 and 2002

This study analyses female native Dutch and ethnic minority employment patterns in the Dutch labour market. Focusing on life-course employment patterns, it aims to find out if native Dutch and ethnic minority women in the Netherlands have undergone a transition towards more labour market participation between 1991 and 2002. Three patterns of change in employment integration by age can be discerned. First, increasing employment levels for native Dutch women of almost all age groups, but in particular for those age groups that have to combine employment with rearing children. Second, a high employment level for Surinamese and Antillean women, revealing strong employment integration of all age groups, so that combining market work and rearing children does not hamper labour market integration. Third, a more traditional pattern for Turkish and Moroccan women, yet indicating an increased employment rate for almost all age groups, in particular 20-24 years. We find that critical life events such as motherhood have different effects on employment for Mediterranean, Caribbean and native Dutch women. In addition, the analysis shows that the attachment of both native Dutch and ethnic minority women to the labour market becomes stronger, and the influence of motherhood becomes smaller, over time. All in all, Caribbean women are the most attached to the labour market. © 2006 Taylor & Francis

Escapement of the Cape rock lobster (Jasus lalandii ) through the mesh and entrance of commercial traps

Metal-framed traps covered with polyethylene mesh used in the fishery for the South African Cape rock lobster (Jasus lalandii) incidentally capture large numbers of undersize (<75 mm CL) specimens. Air-exposure, handling, and release procedures affect captured rock lobsters and reduce the productivity of the stock, which is heavily fished. Optimally, traps should retain legalsize rock lobsters and allow sublegal animals to escape before traps are hauled. Escapement, based on lobster morphometric measurements, through meshes of 62 mm, 75 mm, and 100 mm was investigated theoretically under controlled conditions in an aquarium, and during field trials. SELECT models were used to model escapement, wherever appropriate. Size-selectivity curves based on the logistic model fitted the aquarium and field data better than asymmetrical Richards curves. The lobster length at 50% retention (L50) on the escapement curve for 100-mm mesh in the aquarium (75.5 mm CL) approximated the minimum legal size (75 mm CL); however estimates of L50 increased to 77.4 mm in field trials where trapentrances were sealed, and to 82.2 mm where trap-entrances were open. Therfore, rock lobsters that cannot escape through the mesh of sealed field traps do so through the trap entrance of open traps. By contrast, the wider selection range and lower L25 of field, compared to aquarium, trials (SR = 8.2 mm vs. 2.6 mm; L25 =73.4 mm vs. 74.1 mm), indicate that small lobsters that should be able to escape from 100-mm mesh traps do not always do so. Escapement from 62-mm mesh traps with open entrance funnels increased by 40−60% over sealed traps. The findings of this study with a known size distribution, are related to those of a recent indirect (comparative) study for the same species, and implications for trap surveys, commercial catch rates, and ghost fishing are discussed

Study to minimize hydrogen embrittlement of ultrahigh-strength steels

Hydrogen-stress cracking in high-strength steels is influenced by hydrogen content of the material and its hydrogen absorption tendency. Non-embrittling cleaning, pickling, and electroplating processes are being studied. Protection from this hydrogen embrittlement is important to the aerospace and aircraft industries

A review of the literature on pickling inhibitors and cadmium electroplating processes to minimize hydrogen absorption by ultrahigh-strength steels

Literature review on pickling inhibitors and cadmium electroplating processes to minimize hydrogen absorption by ultrahigh strength steel

A study of hydrogen embrittlement of various alloys Annual summary report, 24 Jun. 1965 - 23 Jun. 1966

Hydrogen embrittlement of alloy cathodically charged and notched tensile metal

A review of the literature on cleaning, pickling, and electroplating processes and relief treatments to minimize hydrogen embrittlement of ultrahigh-strength steels Special report

Cleaning, pickling, and electroplating processes to minimize hydrogen embrittlement of ultrahigh strength steel

Literature review on pickling inhibitors and cadmium electroplating processes

Because introduction of hydrogen during bright-cadmium electroplating of high strength steels causes hydrogen-stress cracking, a program was undertaken to evaluate various processes and materials. Report describes effectiveness of inhibitors for reducing hydrogen absorption by steels

Review of literature on hydrogen embrittlement

Hydrogen embrittlement in high strength iron-base and nickel-base alloys and titaniu

Metro-Line Crossing Minimization: Hardness, Approximations, and Tractable Cases

Crossing minimization is one of the central problems in graph drawing. Recently, there has been an increased interest in the problem of minimizing crossings between paths in drawings of graphs. This is the metro-line crossing minimization problem (MLCM): Given an embedded graph and a set L of simple paths, called lines, order the lines on each edge so that the total number of crossings is minimized. So far, the complexity of MLCM has been an open problem. In contrast, the problem variant in which line ends must be placed in outermost position on their edges (MLCM-P) is known to be NP-hard. Our main results answer two open questions: (i) We show that MLCM is NP-hard. (ii) We give an $O(\sqrt{\log |L|})$-approximation algorithm for MLCM-P