WORKPLACE RESTRUCTURING AND URBAN FORM: THE CHANGING NATIONAL SETTLEMENT PATTERNS OF THE CANADIAN WORKFORCE

ABSTRACT:  This article examines the relationship between emerging work arrangements and national settlement patterns. While growth is centralized in large cities, social commentators continue to suggest that workplace restructuring—facilitated by technological progress—encourages more dispersed settlement patterns, evoking concern about the environmental sustainability of the trend. Multivariate analysis using Canadian census data shows that with the exception of self-employed professionals, the home workers, and self-employed in nonmanual occupations have a lower tendency to reside in large cities than otherwise similar wage and salary earning commuters. However, household mobility and temporal trends suggest that workplace restructuring is not dispersing workers away from large cities by inducing mobility, but that take-up is higher in more remote areas. It is argued that workplace restructuring permits more dispersed national settlement patterns than if workers needed to move to large cities for proximity to employment growth. The article reflects on the implications of the findings for urban sustainability policies that promote compact urban forms and the policies that emphasize consumption amenities of cities to attract mobile workers.     

Pseudovacuoles – immobilized by high-pressure freezing – are associated with blebbing in walker carcinosarcoma cells

By applying high pressure freezing and freeze‐substitution, we observed large inclusions of homogeneous appearance in the front of locomoting Walker carcinosarcoma cells that have not been described earlier. Live cell imaging revealed that these inclusions were poor in lipids and nucleic acids but had a high lysine (and hence protein) content. Usually one such structure 2–5 μm in size was present at the front of motile Walker cells, predominantly in the immediate vicinity of newly forming blebs. By correlating the lysine‐rich areas in fixed and embedded cells with electron microscopic pictures, inclusions could be assigned to confined, faintly stained cytoplasmic areas that lacked a surrounding membrane; they were therefore called pseudovacuoles. After high‐pressure freezing and freeze substitution, pseudovacuoles appeared to be filled with 20 nm large electron‐transparent patches surrounded by 12 and 15 nm large particles. The heat shock protein Hsp90 was identified by peptide sequencing as a major fluorescent band on SDS‐PAGE of lysine‐labelled Walker cell extracts. By immunofluorescence, Hsp90 was found to be enriched in pseudovacuoles. Colocalization of the lysine with a potassium‐specific dye in living cells revealed that pseudovacuoles act as K⁺ stores in the vicinity of forming blebs. We propose that pseudovacuoles might support blebbing by locally regulating the intracellular hydrostatic pressure.     

Transmission EBSD from 10 nm domains in a scanning electron microscope

The spatial resolution of electron diffraction within the scanning electron microscope (SEM) has progressed from channelling methods capable of measuring crystallographic characteristics from 10 μm regions to electron backscatter diffraction (EBSD) methods capable of measuring 120 nm particles. Here, we report a new form of low‐energy transmission Kikuchi diffraction, performed in the SEM. Transmission‐EBSD (t‐EBSD) makes use of an EBSD detector and software to capture and analyse the angular intensity variation in large‐angle forward scattering of electrons in transmission, without postspecimen coils. We collected t‐EBSD patterns from Fe–Co nanoparticles of diameter 10 nm and from 40 nm‐thick Ni films with in‐plane grain size 15 nm. The patterns exhibited contrast similar to that seen in EBSD, but are formed in transmission. Monte Carlo scattering simulations showed that in addition to the order of magnitude improvement in spatial resolution from isolated particles, the energy width of the scattered electrons in t‐EBSD is nearly two orders of magnitude narrower than that of conventional EBSD. This new low‐energy transmission diffraction approach builds upon recent progress in achieving unprecedented levels of imaging resolution for materials characterization in the SEM by adding high‐spatial‐resolution analytical capabilities.     

新型传感器在遥控激光焊接技术中的应用

新型激光器（纤维或盘形激光器）的光束质量的不断提高和新的CO2激光发射系统技术是促进激光材料加工发展的基础。这种激光技术在汽车制造业开拓了新的应用领域：采用扫描技术的遥控焊接。为提高应用激光技术的收益，例如，在系列化生产中，生产过程需要自动化质量控制？     

Reproductive growth of grapevines in response to nitrogen supply and rootstock

Nitrogen fertiliser was applied at two rates (0 or 100 kg N/ha) to field-grown Müller-Thurgau grapevines grafted onto six rootstocks (Kober 5BB, Teleki 5C, Teleki 8B, Selection Oppenheim 4, Couderc 3309, Ruggeri 140). Half the nitrogen was applied four weeks pre-flowering and half at the end of flowering. Nitrogen supply reduced symptoms of inflorescence necrosis and improved fruit set, but increased bunch-stem necrosis, Botrytis cinerea bunch rot and yield. This was associated with reduced grape sugar, higher acidity and lower pH. Rootstocks had no significant effect on inflorescence necrosis, bunch-stem necrosis and bunch rot, but vines grafted on C-3309 and Ru-140 had both lowest yields and highest fruit quality. Nitrogen × rootstock interactions were rare and contributed little to total variance, suggesting that rootstock-induced differences in scion performance were, except for SO4, largely independent of soil nitrogen level.     

Fat Bloom and Chocolate Structure Studied by Mercury Porosimetry

The structure of dark chocolate samples was analyzed by mercury porosimetry in order to determine whether the formation of fat bloom was related to the presence of pores. The influence of cocoa butter concentration and tempering conditions on porosity were determined by using samples containing 29.5 or 31.9% fat, which were under, well or over-tempered. All Mercury porosimetry analysis confirmed the presence of a porous structure in all chocolates. Empty spaces represented about 1% of the whole volume of a well-tempered chocolate containing 31.9% cocoa butter but made up about 4% of the over-tempered chocolate. A well-tempered chocolate with only 29.5% cocoa butter showed the presence of about 2% empty spaces. From these observations and gas permeability a possible model for the microscopic structure was developed.     

The effect of Saccharomyces cerevisiae and Saccharomyces bayanus yeast on colour properties and pigment profiles of a Cabernet Sauvignon red wine

Red wine was made from the same batch of Cabernet Sauvignon grapes but with two different yeasts, Saccharomyces cerevisiae (SC) or Saccharomyces bayanus (SB). The colour properties and pigment profiles of SC and SB wines were compared at 8 days and 387 days after yeast inoculation. Grape anthocyanin concentration was found to be lower in SB wines than in SC wines at day 8 and 387, but SB wine exhibited greater wine colour density, a* and b*. The anthocyanin concentration did not correlate with wine colour density. The levels of pigmented polymers and SO₂ non-bleachable pigments were found to be higher in SB wine at day 387, demonstrating that the formation of stable pyranoanthocyanins and pigmented polymers was enhanced by SB yeast. Electrospray mass spectrometry was used for the compositional analysis of pyranoanthocyanins, and direct and ethyl-bridged linked condensation dimers of malvidin 3- O -glucoside (MvG) with flavanols (catechin or epicatechin). The data demonstrated that the formation of acetaldehyde-mediated pigments was enhanced by the use of the SB yeast. The compositional analysis suggested that the differences in colour properties and pigment profiles of SC and SB wines were largely due to the greater production of acetaldehyde-mediated pigments by the use of SB yeast.     

全自动液位测量与监控系统-GSM-2

全自动操作测量系统的需求一直存在着,但人们还在使用就地读出式的数据记录仪,这意味着所有的被采集的数据都是过期的,这种就地式仪器不具备持续监测功能。移动通信网络和Internet的使用使得分散式的测量系统可以利用虚拟合并技术,在地域上实现一致,并随时采集任何需要的数据。