The results of Soviet urbanization of Chita Oblast: structure, count and functional significance of urban settlements

  The article is dedicated to the results of urbanization of Chita Oblast in the late Soviet period. The author examines the established structure of urban settlements, count of cities and industrial townships, as well as their functional designation in the late 1980s. A brief characteristic of production base formed in the Soviet period (organizations, enterprises, etc.) is given by each city and large worker’s settlement. Calculation is conducted on separate demographic parameters of urbanization of the region: share of the urban population, share of the population of cities and industrial townships in the urban population, etc. The research leans on the official results of the All-Union Census of 1989, as well as the data from the official websites of urban settlements in Zabaykalsky Krai. It is underlined that by the end of the 1980s, on the territory of Chita Oblast was formed a broad and dispersed network of urban settlements, which for the most part scattered along Trans-Siberian Railway and southward towards the border with China. Trans-Baikal Railway and mining industry played the leading role in formation of majority of cities and workers’ settlements. The structure of urban settlements highlighted the capita of the region – Chita by demographical and functional aspects. However, nine more cities and five large townships with over 12,000 population and developed infrastructure, smoothed out the territorial imbalances in urbanization of the region.  

Carriers and cutters: size-dependent caste polyethism in the tropical fire ant (Solenopsis geminata)

Body size is an important life-history trait in eusocial insects which plays a key role in colony fitness. The division of labour, represented by caste polyethism, correlates with divergent morphological traits. Size polymorphism has been noted in the tropical fire ant, Solenopsis geminata; however, little is known regarding the differences in the size distributions of workers performing foraging tasks. In the present study, task partitioning was observed in the foraging activities of S. geminata. Two subgroups among foraging workers of S. geminata were discovered using the Gaussian mixture model: a large worker group (head width ≥ 0.924 mm) and a small worker group (head width < 0.924 mm). The foraging worker population comprised two distinct groups – 25.64% were large workers and 74.36% were small workers. Larger workers delivered heavier seeds faster than smaller workers, but this difference became less apparent when lighter seeds were being carried. When large prey such as crickets was encountered during foraging, S. geminata partitioned their tasks into cutting and transportation. The large workers were observed to cut cricket prey into fragments with their longer mandibles, and the small workers then transported these fragments back to the nest. These results present evidence of task partitioning among tropical fire ants, with different tasks being performed by ants of different castes.

BRIEF OF BUILDING INFORMATION MODELLING FOR INDONESIAN ARCHITECTURE

Building information modelling (BIM) is a system that integrates multi-dimensional aspects of construction project at every phase. Simply said BIM unified all project databases from and to all stakeholders. This system still continuously developed and widely spread on each countries construction projects. In architecture, the BIM has been revolute the human resource requirements on the projects. Indonesia as developing country is still performing transitions from large worker project into more compact projects; from centralized projects into decentralized project. The BIM system has been a mandatory in several Indonesia big infrastructure projects to plan, simulate, design and deliver databases for making more quick decision making and improve the facilities. This paper aim is describing the benefit-challenge factors of BIM adoption on Indonesia architecture projects and the potential driving factors of BIM application. This study was qualitative paradigm with analysis method of selected literatures and previous research paper review which stratified by the cases. The results of this study are BIM bring the high efficiency and represent the complete skills for an architect. However the high initial cost of technology and human investment, the unsupported regulation and conventional system resistant challenged the Indonesia architecture society to adopt BIM. Furthermore the Indonesia architecture education is still struggling to learn and teach the BIM as an integral part in studio as the agent of change.

Earnings Losses and Labor Mobility Over the Life Cycle

Large and persistent earnings losses following displacement have adverse consequences for the individual worker and the macroeconomy. Leading models cannot explain their size and disagree on their sources. Two mean-reverting forces make earnings losses transitory in these models: search as an upward force allows workers to climb back up the job ladder, and separations as a downward force make nondisplaced workers fall down the job ladder. We show that job stability at the top rather than search frictions at the bottom is the main driver of persistent earnings losses. We provide new empirical evidence on heterogeneity in job stability and develop a life-cycle search model to explain the facts. Our model offers a quantitative reconciliation of key stylized facts about the U.S. labor market: large worker flows, a large share of stable jobs, and persistent earnings shocks. We explain the size of earnings losses by dampening the downward force. Our new explanation highlights the tight link between labor market mobility and earnings dynamics. Regarding the sources, we find that over 85% stem from the loss of a particularly good job at the top of the job ladder. We apply the model to study the effectiveness of two labor market policies, retraining and placement support, from the Dislocated Worker Program. We find that both are ineffective in reducing earnings losses in line with the program evaluation literature.

Genetic polymorphism in leaf-cutting ants is phenotypically plastic

Advanced societies owe their success to an efficient division of labour that, in some social insects, is based on specialized worker phenotypes. The system of caste determination in such species is therefore critical. Here, we examine in a leaf-cutting ant ( Acromyrmex echinatior ) how a recently discovered genetic influence on caste determination interacts with the social environment. By removing most of one phenotype (large workers; LW) from test colonies, we increased the stimulus for larvae to develop into this caste, while for control colonies we removed a representative sample of all workers so that the stimulus was unchanged. We established the relative tendencies of genotypes to develop into LW by genotyping workers before and after the manipulation. In the control colonies, genotypes were similarly represented in the large worker caste before and after worker removal. In the test colonies, however, this relationship was significantly weaker, demonstrating that the change in environmental stimuli had altered the caste propensity of at least some genotypes. The results indicate that the genetic influence on worker caste determination acts via genotypes differing in their response thresholds to environmental cues and can be conceptualized as a set of overlapping reaction norms. A plastic genetic influence on division of labour has thus evolved convergently in two distantly related polyandrous taxa, the leaf-cutting ants and the honeybees, suggesting that it may be a common, potentially adaptive, property of complex, genetically diverse societies.

Agricultural Pesticide Use in Developing Countries: Health Effects and Research Needs

Large worker populations in the Third World are exposed to increasing amounts of pesticides, including pesticides severely restricted and banned in industrialized countries. Studies on knowledge, attitudes, and practices indicate that unsafe use of pesticides is the rule in Third World countries. Surveys of acute poisonings show high rates in these countries, despite underregistration. The scarce studies on chronic health outcomes demonstrate neurotoxic, reproductive, and dermatologic effects. Exposure assessment consists mainly of Cholinesterase testing, and few studies have quantified dermal and respiratory exposure. The few intervention studies demonstrate the need for evaluation of the impact of preventive measures and policies. There is no evidence that widespread “safe-use” programs have greatly affected exposure and morbidity. It was concluded that research should focus on simple methods for surveillance of exposure and on surveillance of acute illness and its causes in order to develop and evaluate rapid local interventions. Studies on chronic effects should be carried out in selected countries, aiming at long-term and broader interventions. Policies that promote the use of pesticides should be critically evaluated. North–South and South–South research collaborations must be encouraged to address this global health problem.