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191.
基于相对资源承载力模型的研究 总被引:3,自引:0,他引:3
首先分析了相对资源承载力模型存在的不足,即未考虑各类资源间的匹配以及权重取值过于主观,并对其进行了改进。然后应用改进后的模型对新疆1978—2008年可持续发展情况进行了实证分析,研究表明:①1978—2008年,新疆相对耕地资源承载力最大,其次是耕地和经济资源均衡承载力,经济资源承载力最弱;②新疆的相对综合承载力和过剩人口1978—2000年呈递增趋势,而2001—2008年处于逐渐恢复和扩张的态势;③新疆人口目前仍处于过剩状态。同时比较分析了模型改进前后的实证结果,并对新疆人口的可持续发展提出了一些建议。 相似文献
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为了解决制药行业典型VOCs物质——丙酮的易挥发、难降解问题,对改性海泡石吸附丙酮的性能和表征进行了研究。研究结果表明:1)质量分数为13%的盐酸改性海泡石12h后对丙酮的吸附效果最好,吸附量达54.41 mg/g;2)水热温度170℃的海泡石对丙酮的吸附量也可达到23.20mg/g;3)对海泡石采用酸和水热改性的方式进行处理后,改性海泡石的实际丙酮平衡吸附过程均符合Lagergren二级吸附速率方程;4)表征结果表明,酸改性可使海泡石比表面积增大,杂质降低,孔道更顺畅,利于丙酮的吸附。该研究为丙酮污染的治理提出了新路线,在工业催化领域拥有广阔的应用前景。 相似文献
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Abundant user-generated content has increasingly driven consumers to form or modify their purchasing decisions based on interactions with other consumers, although the extant research overlooks the customer-to-customer (C2C) interaction touchpoints. Based on the customer journey characteristics of cross-channel and multi-frequency interactions, this study explores the impact of interaction valence and interaction channel sequence on Generation Z consumers' purchase attitudes from the perspective of attitude modification process. Using a scenario-based experimental design in a restaurant setting, we sample 616 Generation Z students. Findings suggest that C2C interactions that have the same valence at each touchpoint strengthen Generation Z consumers' initial purchase attitude, whereas inconsistent valences modify purchase attitudes. Our results reveal that a negative-to-positive ordering is more conducive to the formation of a positive purchase attitude than a positive-to-negative ordering. Moreover, the cross-channel sequence of a customer journey moderates the inconsistent valence order such that the positive-to-negative order improves purchase attitude more than the negative-to-positive order. This study explains theoretically the difference of ambivalent experiences on Generation Z consumer attitudes. We provide practical suggestions for multi-channel restaurant enterprises to successfully employ customer journey touchpoint management. 相似文献
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《International Journal of Forecasting》2023,39(2):541-555
Many internet platforms that collect behavioral big data use it to predict user behavior for internal purposes and for their business customers (e.g., advertisers, insurers, security forces, governments, political consulting firms) who utilize the predictions for personalization, targeting, and other decision-making. Improving predictive accuracy is therefore extremely valuable. Data science researchers design algorithms, models, and approaches to improve prediction. Prediction is also improved with larger and richer data. Beyond improving algorithms and data, platforms can stealthily achieve better prediction accuracy by pushing users’ behaviors towards their predicted values, using behavior modification techniques, thereby demonstrating more certain predictions. Such apparent “improved” prediction can result from employing reinforcement learning algorithms that combine prediction and behavior modification. This strategy is absent from the machine learning and statistics literature. Investigating its properties requires integrating causal with predictive notation. To this end, we incorporate Pearl’s causal operator into the predictive vocabulary. We then decompose the expected prediction error given behavior modification and identify the components impacting predictive power. Our derivation elucidates implications of such behavior modification to data scientists, platforms, their customers, and the humans whose behavior is manipulated. Behavior modification can make users’ behavior more predictable and even more homogeneous; yet this apparent predictability might not generalize when business customers use predictions in practice. Outcomes pushed towards their predictions can be at odds with customers’ intentions, and harmful to manipulated users. 相似文献