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排序方式: 共有172条查询结果,搜索用时 140 毫秒
1.
本文着重介绍了下营坊一带主要构造格架—NE向S状不对称褶曲的几何特征、形成机制、变形环境及控岩控矿作用。通过区域应力场分析及岩组分析,揭示了该区在NE向左行斜冲剪切机制下,元古界层状岩层因上、下界面的滑脱剪切所造成的交形效应以及所处的中温低压变形坏境。不对称褶曲的翼部地层的顺层滑脱和转折端部位的虚为本区中酸性岩浆活动提供了侵位通道和空同。向SWW倾伏的不对称褶曲的背斜转折端与EW向及NNE向复合构造控制下营坊南梁斑岩型铜矿。 相似文献
2.
High concentrations of manganese and iron in the Saigon River are major problems for the water supply in Ho Chi Minh City (HCMC), Viet Nam. To identify their sources and leaching processes, we surveyed water quality along the Saigon River and ran batch leaching tests using soil and sediment samples. Two important leaching processes were identified: acidic leaching from acid sulfate soil (ASS) in the middle reaches of the river, and Mn dissolution and Fe reduction from sediments in the downstream reaches. Low pH caused the concurrent release of Fe and Mn from the ASS. In contrast, anoxia caused the release of Fe but not Mn from the sediments, whereas low pH facilitated Mn dissolution. Sediments are a more important source of Mn because of their higher Mn contents (10 times) and release rates (14 times) than those from ASS. 相似文献
3.
We construct a simple model that tests for repressed inflation by estimating a true rate of inflation that explains behavior of observed money demand. We estimate the model using quarterly data for Czechoslovakia and Poland. Although our results should be viewed as preliminary, given the imperfect nature of our data, we do have strong evidence that, prior to 1991, there was considerable repressed inflation in Poland, while there was essentially no repressed inflation in Czechoslovakia.This paper was funded by a World Bank project on formerly planned economies. We would like to thank Jong-goo Park for suggesting the topic, and Fabrizio Coricelli and Adnan Mazarei for helpful discussions. The views expressed here are our own and do not necessarily reflect the opinions of the World Bank. 相似文献
4.
We present three conditions for a demography-driven middle-income trap and show that many economies in East, South, and Southeast Asia satisfy all of them. The conditions involve (1) the support ratio of workers to consumers has an impact on economic growth, (2) economic development accompanies more investment in human capital and lower fertility due to the quantity–quality trade-off, and (3) a current low level of fertility corresponds to very low support ratios for keeping up with frontier economies in the long run. Panel analysis for 178 countries shows that (1) and (2) are satisfied for Asia with higher elasticity than others. As for (3), we set up a dynamic model for simulations, showing that approximately two-third of Asia’s developing countries have an unsustainable level of support ratios, implying possibility of a middle-income trap due to future demographic headwinds. 相似文献
5.
Brian McCauley Truc Ha Thanh Nguyen Matthew McDonald Stephen Wearing 《Leisure Studies》2020,39(3):372-386
ABSTRACT New information and communication technologies continue to spread rapidly into the Asian marketplace, which has led to new patterns of leisure consumption, one of the most popular being digital gaming. However, in Vietnam there is limited research on gaming as a leisure activity. The purpose of this study is to explore the phenomenon of digital gaming in Vietnam to better understand how it is practiced in this culture. Semi-structured interviews were conducted with twenty-five gaming industry figures and gamers. Thematic analysis was used to guide data collection and analysis. The findings indicate that glocalisation, socialised gaming practices and competitiveness characterise the Vietnamese gaming experience. The distinct culture of Vietnam combined with globalised gaming consumption habits has created new modes of play culture, and hence leisure experiences that are growing in pervasive and influential ways. 相似文献
6.
Using firm-level data, this paper examines the effects of foreign investment on the exporting behaviour of domestic firms in the Vietnamese manufacturing and service sectors. Applying the Heckman selection model on panel data and following the Wooldridge approach, we find that investment by foreign firms has a significant positive effect on the decision of domestic firms in the same and upstream sectors to export. The proportion of exports of domestic firms declines through horizontal and forward linkages, but increases through backward linkages in the manufacturing sector. However, there is only weak evidence in support of export spillovers on domestic firms in the service sector. We also find that the presence of foreign firms has differing effects on the exporting activities of low- versus high-tech firms in the manufacturing sector. 相似文献
7.
Optimal surveillance against foot‐and‐mouth disease: the case of bulk milk testing in Australia
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Tom Kompas Pham Van Ha Hoa Thi Minh Nguyen Iain East Sharon Roche Graeme Garner 《The Australian journal of agricultural and resource economics》2017,61(4):515-538
Previous foot‐and‐mouth disease (FMD) outbreaks and simulation‐based analyses suggest substantial payoffs from detecting an incursion early. However, no economic measures for early detection have been analysed in an optimising framework. We investigate the use of bulk milk testing (BMT) for active surveillance against an FMD incursion in Australia. We find that BMT can be justified, but only when the FMD entry probability is sufficiently high or the cost of BMT is low. However, BMT is well suited for post‐outbreak surveillance, to shorten the length of time and size of an epidemic and to facilitate an earlier return to market. 相似文献
8.
Chuc Dinh Nguyen Anh Ngoc Nguyen Trang Ha Nguyen Minh Ngoc Nguyen 《Asia Pacific Business Review》2017,23(3):438-453
Using technological capabilities as embodied in machinery, organization, processes and products, this study examines the links with host-site institutions and regional production linkages. The statistical results show no relationship between these variables. In-depth interviews complement the quantitative findings. Overall, the result shows that the government’s localization efforts failed because too many joint-venture assemblers were approved in the 1990s when the domestic market was small. The lack of economies of scale also affected the growth of national suppliers. Hence, national producers are confined to low value added segments and lack the quality to compete in export markets. 相似文献
9.
Hyunjung Lee Kyoungnam Catherine Ha Youngseon Kim 《International Journal of Nonprofit & Voluntary Sector Marketing》2018,23(3)
Nonprofit arts and cultural organizations use marketing to sustain viability. This study uses data from the Cultural Data Project to examine the effects of marketing on revenue in arts and cultural organizations. The current analysis demonstrates that total marketing expense is positively related to total revenue. Marketing expense used for fund‐raising positively influences donation income, as intended, whereas commercial income is not affected. Alternatively, marketing expense for programs positively influences both commercial income, as intended, and donation income. The novel finding from this study is that marketing expense mainly targeting non‐donor ticket buyers not only increases commercial income but also augments donation income in arts and cultural organizations. 相似文献
10.
红山水库位于处于水磨河的出山口处,是阜康市的一座以灌溉和防洪为主的综合性拦河骨干水库工程,通过收集相邻流域水文站的资料运用地区洪峰流量模比系数综合频率曲线法计算不同频率设计洪峰流量,运用适线法计算不同频率设计洪量。 相似文献