^14C标记现场测定海洋初级生产力培养方法比较

以大亚湾和台湾海峡的实测数据为依据，认为培养过程中的搅动十分重要。对比＾１４Ｃ测定初级生产力的几种培养方法，结果表明，悬挂式现场培养法比较可靠，但其应用受到一定限制；旋转培养法与悬挂式现场培养法结果相近，又可在甲板上进行，值得推广；静置培养法由于培养过程中缺乏搅动，数据不稳，结果偏低，不宜采用。２４ｈ连续悬挂式现场培养法的结果及计算机对培养过程的模拟指出，新固定的碳可快速损失，因此培养时间不宜超过     

Primary Production and Growth Dynamics in Posidonia oceanica

Abstract. Studies on leaf growth and production were performed in two stands, at depths of 5 m and 22m, in the Posidonia oceanica (L.) D elile bed off Lacco Ameno, Ischia (Gulf of Naples). Experiments were carried out in situ from May 1988 to August 1989 at monthly intervals.
Leaf growth and production profiles differed in the two stands investigated. Growth rates were higher at 5 m, with a peak in autumn (5.8 mg · shoot^-1· d^-1) and another in March (3.8 mg · shoot^-1· d^-1). At 22 m the maximum rate occurred in May (3.9 mg · shoot^-1· d^-1). These differential growth rates resulted in a delayed maximum leaf surface and biomass at the deep stand, where lower irradiance values and different temperature patterns were also found. The biomass of epiphytic algae showed trends similar to those of leaves; however, there were remarkable differences in the values between the two stations and for the two investigated years.
The production data of the present study are compared with those of other reports, and it is shown that growth processes are greatly influenced by physical factors.     

Post-welfare city at the margins: immigrant precarity and the mediating third sector in London

The putative post-welfare city is marked by a debate between continuity with previous welfare structures, versus a radical break whereby new, more punitive measures prevail. Seeking to clarify the role of the third sector at the margins of the debated post-welfare city, margins which can be characterized by a stigmatized and abandoned clientele, I focus on organizations serving precarious migrants in London. There were 15 interviews of third sector organizations across well-served, inner boroughs (Hackney, Newham, Tower Hamlets) and less well-served outer boroughs (Brent, Hounslow). The results indicated a mixed intermediary role for third sector organizations: strong in compensating and filling the gaps from an absent state, yet rather weak in contesting or challenging the overbearing state on behalf of their clients. More generically, the results also underlined the importance of looking beyond the labor market to appreciate the intricacies of social reproduction among precarious populations, as well as recognizing important continuities in support systems that belie a radical break with previous structures.     

How useful are Primary Care Service Areas? Evaluating PCSAs as a tool for measuring Primary Care Practitioner access

The appropriate delivery of primary care services, an important policy imperative in many developed nations, is contingent on defining appropriate geographies to which these services are delivered. Primary Care Service Area (PCSA) geographies have been created in some countries to facilitate primary care policy making and have been utilized in a large body of research. In spite of their extensive use across rural and urban settings, the usefulness of PCSAs has not been evaluated. In this study, for the first time we put PCSAs to the test by comparing them to another small area geography - Postal Areas, and by exploring their usefulness in measuring relationships between Primary Care Practitioner supply and use. We find while PCSAs are better than Postal Areas in measuring relationships between General Practitioner supply and visits by patients, this relationship shows some heterogeneity across areas.     

“Finding their way”: the negotiation of the city by low-skilled service sector migrant workers in Dublin

The city has become the context for a dialectical relationship not only between the global and the local but also between migrants and the host society. Whilst there is considerable work on migrant integration, integration is rarely examined from the perspective of the workplace, or from a geographic perspective, which problematizes the spatiality of migrant workers’ experiences. This article studies migrant workers in low-skilled jobs, with a focus on Temporary Service Sector Providers in catering, cleaning, and security, in order to understand how they negotiate their position in the city and are active agents of this negotiation. The study, based upon a survey of 60 migrants complemented by 20 in-depth interviews, questions how integration should be understood: in particular it suggests that—in some respects—integration may be difficult for all low-wage precarious workers, whether migrants or not. The study also highlights how migrant workers retain agency—the capacity to act, to make decisions, and appropriate certain places—even in challenging circumstances.     

直接评价法在油气集输管道内腐蚀评价中的应用

文章以某油田集输管道内腐蚀评价为例,说明了直接评价法能有效识别油气集输管道内腐蚀,而且还能对因受条件制约不能进行内检测的集输管道进行内腐蚀评价,同时还能在内腐蚀未发生之前进行内腐蚀预测并识别出管道内腐蚀的高风险段。     

The social networks of British and Indian expatriate scientists in Boston

This paper argues that although the social networks of highly skilled migrants are important, British and Indian scientists in Boston tend not to use expatriate social networks. I demonstrate that wider differences in cultural norms to the indigenous population, homogeneity within a migrant group and length of time spent in the US are not the only factors that affect the participation of highly skilled migrants in expatriate social networks. Other factors such as the size of an expatriate group, the annual flow of migrants to a region as well as the propensity of expatriates to participate in indigenous social networks will also affect the extent to which they participate in these networks.     

Emotional labour/body work: The caring labours of migrants in the UK’s National Health Service

The provision of care is an increasingly pressing issue in the Global North. With an ageing population and policies encouraging women into the labour market, there is a growing need for workers to undertake paid caring. This poses important and urgent questions about the social organisation of labour markets. Care work typically is low paid and undertaken in precarious, informal, or temporary situations. Many posts are filled by economic migrants, raising concerns about a care deficit in sending countries. In this paper we examine the ‘caring work’ undertaken by migrant workers in a West London Hospital. We employ a twofold characterisation of caring work. Like other bottom-end service sector work, this work is characterised by the face-to-face ‘emotional labour’. However, it also requires ‘body work’: close and often intimate physical contact between carers and those they care for. We argue that both of these aspects are important in understanding how caring work is constructed as poorly regarded and low paid. We show how these features play out in particular ways for migrant workers employed in such caring work.     

Employment in Cape Town’s lodging sector: opportunities, skills requirements, employee aspirations and transformation

Since the attainment of democracy in 1994 one of the major concerns of the South African government has been to address the social and economic injustices that characterised the apartheid regime. With tourism on the rise in South Africa and international arrivals growing at a rate almost triple the global rate, the tourism industry has been identified as one of the important industries to drive the transformation agenda. This study sought to assess the employment situation in Cape Town’s lodging sector, identify the existing types of jobs and skills requirements of the sector, determine career aspirations of and skills development needs for lodging sector employees as well as asses the state of transformation. Study findings showed that the lodging sector is labour intensive, requires low academic skill, and offers low paying employment following the findings that about a quarter of the respondents indicated that their jobs didn’t require any formal qualification, the average working day was 9.2 h and 52% earned below R3,500 a month. The study showed significant differences in income based on race. White employees earned significantly more than their black and coloured counterparts. However, white employees working as general labour were also significantly more qualified than their black and coloured counterparts. There was a significant positive relationship between income and length of service for white employees, but the same wasn’t true for black and coloured employees. There was a significant negative relationship between length of service and academic qualifications for black employees implying that black people’s length of service for one employer decreases as they become more academically qualified. Also significant was skills development opportunities based on gender. Significantly more females than males had attended on-the-job training programs.     

AN OBSERVATIONAL ANALYSIS OF A TORRENTIAL RAINSTORM IN THE WARM SECTOR OF SOUTH CHINA COASTAL AREAS

On May 20 th 2007, a brief but severe downpour rainstorm occurred in the coastal areas of Maoming and Yangjiang with rainfall of 115 mm per hour. Data from NCEP/NCAR reanalysis with 1°×1° resolution, Doppler weather radar, conventional surface observations, high-altitude radiosonde and wind profiler radar were used to analyze characteristics and contributions of synoptic scale and mesoscale systems during this torrential rainstorm. The results showed that:(1) the storm was caused by a quasi-linear mesoscale convective system(MCS) and the slow-movement of this system was the primary trigger of the torrential downpour;(2) water vapor was abundant, nearly saturated and in steady state throughout the atmosphere before the storm; intrusion of the weak dry and cold air in the middle level and a striking "dry above and wet below " structure had increased the atmospheric instability;(3) low-level southwesterly airflow from a low pressure(trough) at the Beibu Gulf provided abundant water vapor at the onset of the rainstorm; a deep dry layer was formed by dry and cold air behind the high-level trough, which facilitated latent heat release;upper-level divergence and low-level convergence circulations also provided vertical uplift for warm and moist air at the lower level;(4) Topography only played a minor role as the MCS developed and strengthened over relatively flat coastal terrain. Low level density flow induced by convection triggered new convective cell generation at the leading edge of the convective system, thereby playing a key role in the change of temperature gradient at lower layers, and resulting in strengthening atmospheric instability.