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排序方式: 共有1147条查询结果,搜索用时 15 毫秒
51.
Xingliang Ma Melinda Smale David J. Spielman Patricia Zambrano Hina Nazli Fatima Zaidi 《Journal of Agricultural Economics》2017,68(2):366-385
Bt cotton remains one of the most widely grown biotech crops among smallholder farmers in lower income countries, and numerous studies attest to its advantages. However, the effectiveness of Bt toxin, which depends on many technical constraints, is heterogeneous. In Pakistan, the diffusion of Bt cotton occurred despite a weak regulatory system and without seed quality control; whether or not many varieties sold as Bt are in fact Bt is also questionable. We utilise nationally representative sample data to test the effects of Bt cotton use on productivity. Unlike previous studies, we invoke several indicators of Bt identity: variety name, official approval status, farmer belief, laboratory tests of Bt presence in plant tissue, and biophysical assays measuring Bt effectiveness. Only farmer belief affects cotton productivity in the standard production model, which does not treat Bt appropriately as damage‐abating. In the damage control framework, all Bt indicators reduce damage from pests. Biophysical indicators have the largest effect and official approval has the weakest. Findings have implications for impact measurement. For policy‐makers, they suggest the need, on ethical and productivity grounds, to improve variety information and monitor variety integrity closer to point of sale. 相似文献
52.
This study assesses the potential impact of rising world food prices on the welfare of Ugandan households. While Uganda experienced sharply higher food prices in 2008, as a landlocked, food‐exporting country the causes of those price changes were mainly regional and indirect rather than directly transmitted from global markets. Using trade volumes, food prices, and household survey data we describe how Uganda, unlike some other countries, is partially shielded from direct impacts of global food price movements. Although the majority of Ugandans are net food buyers, the adverse impact at household‐level of rising global prices is moderated by the relatively large quantity and range of staples consumed that come from home production. Moreover, several of these are not widely traded. Some population groups in Uganda are vulnerable to rising food prices, however, primarily those for whom maize is an important staple, including those dependent upon humanitarian relief and the urban poor. Only a relatively small group of Ugandan households will benefit directly and immediately from rising food prices—the significant net sellers of food crops constituting between 12% and 27% of the population. In this assessment we do not estimate the level and extent of wider second round effects from these higher prices. 相似文献
53.
In today's increasingly competitive climate, more and more managers are having to update themselves on the range of factors that determine product innovation success. Such successes can be measured at the project (product) level or at the program level. Axel Johne and Patricia Snelson have prepared a review of factors associated with achieving success in a high proportion of recently developed new products. The authors address practical questions, such as the following: To what extent can product innovation be planned? Should development tasks be scheduled sequentially or in parallel? What is the proper degree of formality in effective new product decision making? What are the optimal organizational arrangements? The article concentrates on recent writings, drawing chiefly from journal articles published after 1980, including a large number from the Journal of Product Innovation Management. Factors contributing to success are ordered according to the now well-known McKinsey 7 Ss framework popularized by Peters and Waterman in their book In Search of Excellence. Detailed development tasks are considered according to the schema advanced by Crawford in his book New Products Management. 相似文献
54.
Putu Liza Kusuma Mustika Riccardo Welters Gerard Edward Ryan Coralie D'Lima Patricia Sorongon-Yap Suwat Jutapruet 《Journal of Sustainable Tourism》2017,25(8):1138-1158
Dolphin-watching tourism is growing globally. In developing countries, the typically low environmental awareness of operators and poorly enforced or non-existent regulations exacerbate risks to wildlife. Ecological indicators like behavioural responses are useful to assess wildlife tourism, but obtaining such data is slow and expensive. We modified the Driver–Pressure–State–Impact–Response (DPSIR) framework to rapidly assess the risk of dolphin-watching tourism harming, displacing or causing local extinction to dolphin populations, using human dimension data to complement limited ecological data. We assessed industries at seven dolphin-watching sites in six countries in Asia: Cambodia, India, Indonesia, Malaysia, Thailand, and the Philippines. All sites have reached or almost reached financial saturation except Cambodia and Malaysia. We find high risk to dolphins at the sites in India and Indonesia and intermediate risk at the site in Cambodia. Pending more ecological data, the risk at Thailand, the Philippines, and Malaysian sites might be low. Our analysis also indicates site-specific conservation recommendations for Driver, Pressure and Response. We suggest that the DPSIR framework is useful to assess the risk of a wildlife watching industry, even when the impact is uncertain due to insufficient ecological data. 相似文献
55.
56.
Patricia Kelly 《Futures》2010,42(10):1110-1118
The global environment is increasingly under threat and we face a challenge with little time to respond. Are we prepared to change the actions and attitudes that have led to this parlous situation, and if we are, how do we do it? Is the world ready for a more ecologically benign, less economically driven, peaceful and spiritually oriented way of living? My challenge lies in higher education. How do you encourage such values in a tertiary education system which has spent many years applying and rewarding a ‘respond to the market’ discourse? My responses are grounded in transformative education research with large diverse cohorts of first year engineering students. This paper also uses a critical futures methodology, Causal Layered Analysis, to update my concerns about Australian engineering education and the profession, using two recent reports. The aim is to offer constructive insights that may be transferable to educators in other contexts. 相似文献
57.
Patricia Rinwigati Waagstein 《Journal of Business Ethics》2011,98(3):455-466
The adoption of the 2007 Indonesian Law No. 40 has created significant debate over the nature of Corporate Social Responsibility
(CSR), namely, whether it is voluntary or mandatory. On the one hand, the adoption of such a law represents a legal recognition
of the existence of CSR, and this clarification on the legal nature of a concept is necessary for understanding the obligation
and responsibility. On the other hand, it has created much confusion surrounding its substance and procedures. This article
tries to analyze the development and consequences of CSR under 2007 Indonesian Law No. 40, through the discussion of mandatory
versus voluntary dichotomy. It is argued in this article that the mandatory nature of CSR is legitimate and therefore encouraged;
however, in practice, this is problematic, as it not only requires a precise concept of interpretation of CSR and identification
of the duty bearer and beneficiaries, but also an effective implementation mechanism and a means of verifying the impact. 相似文献
58.
Stuart Cottrell René van der Duim Patricia Ankersmid Liesbeth Kelder 《Journal of Sustainable Tourism》2013,21(5):409-431
This paper examines tourist perceptions of sustainability in Manuel Antonio/Quepos, Costa Rica and Texel, The Netherlands. It also reviews tourist opinions of site-specific sustainability aspects and assesses differences between tourist types and their perceptions of sustainability. The ecological dimension of sustainability was perceived the most important, followed by social-cultural and economic dimensions. Among tourists to Manuel Antonio/Quepos there was no distinctive difference between the last two dimensions while the economic dimension was far less important among Texel tourists. Loss of local lifestyles and processes of urbanisation were the most serious problems perceived in Manuel Antonio/Quepos. For Texel, a fewrespondents indicated problems such as increase of prices, urbanisation and loss of local lifestyles. Results demonstrate tourist awareness of sustainability issues and that in the long run this awareness might lead to changes in tourist preferences. 相似文献
59.
Joseph P. Cannon Patricia M. Doney Michael R. Mullen Kenneth J. Petersen 《Journal of Operations Management》2010,28(6):506-521
This research investigates buyer–supplier relationships in international markets. Research and practice have shown that buyer–supplier relationships benefit when partners to the relationship exhibit a long-term orientation. The extant literature suggests that a buyer's trust of a supplier and the supplier's performance affect the buyer's long-term orientation toward the relationship. We propose that the relative effects of trust and performance on long-term orientation are moderated by culture – specifically the individualism/collectivism dimension. Hypotheses are tested on data from two individualist and two collectivist cultures, using responses from over 600 purchasing professionals in the United States, Anglophone Canada, Francophone Canada and Mexico. Taken together, empirical findings suggest that cultural differences warrant consideration in developing successful purchasing strategies. 相似文献
60.
Erica Donnelly-Swift Alan Kelly 《International journal of injury control and safety promotion》2016,23(4):351-361
Generalised linear regression models were used to identify factors associated with fatal/serious road traffic collision injuries for single- and multi-vehicle collisions. Single-vehicle collisions and multi-vehicle collisions occurring during the hours of darkness or on a wet road surface had reduced likelihood of a fatal/serious injury. Single-vehicle ‘driver with passengers’ collisions occurring at junctions or on a hill/gradient were less likely to result in a fatal/serious injury. Multi-vehicle rear-end/angle collisions had reduced likelihood of a fatal/serious injury. Single-vehicle ‘driver only’ collisions and multi-vehicle collisions occurring on a public/bank holiday or on a hill/gradient were more likely to result in a fatal/serious injury. Single-vehicle collisions involving male drivers had increased likelihood of a fatal/serious injury and single-vehicle ‘driver with passengers’ collisions involving drivers under the age of 25 years also had increased likelihood of a fatal/serious injury. Findings can enlighten decision-makers to circumstances leading to fatal/serious injuries. 相似文献