Conservation Payments, Liquidity Constraints and Off-Farm Labor: Impact of the Grain for Green Program on Rural Households in China

This study evaluates the off-farm labor response of rural households participating in the Grain for Green program in China, the largest conservation set-aside program in the developing world. Using a panel data set that we designed and implemented, we examine the impact of the program on changes in off-farm labor participation between 1999 (pre-program) and 2004 (post-program) using a difference-in-differences approach and several extensions that account for program intensity. We also test whether the program impact is diverse depending on level of physical and human capital of participants. We find that on average the Grain for Green program has a positive effect on off-farm labor participation. Importantly, however, we find that program effects vary across groups of individuals in the sample. For example, we find that lower initial levels of wealth enhance the impact of the program on the off-farm employment activity. This result supports our view that the Grain for Green program may be relaxing liquidity constraints for the participating households and that is one reason why participants are more likely to find off-farm employment compared to non-participants. The positive impact of the conservation payments on off-farm labor is in stark contrast with the findings in the US where most studies have found that government payments to farmers decrease off-farm labor participation. One reason for the difference in findings between China and US may be because there are more impediments to participating in off-farm labor market in the poor areas of rural China (the areas in which the programs are being implemented) compared to the US and Grain for Green helps overcome these constraints. It could also be that there are differences in the age structure of the farming population between China (which is generally younger) and the US (which is generally older). This interpretation is reinforced by the finding that, while the average impact is positive, there is an even larger measured positive effect for the younger cohort. The measured effect of Grain for Green is negative for the older cohorts. We also find no impact on off-farm labor participation for individuals with low educational attainment (and positive for those with higher levels of education), suggesting that human capital is necessary when trying to achieve a structural change to earning activities. If policymakers want to achieve a win-win outcome through Grain for Green by meeting both the program's environmental and development goals, they may need to provide extra support (for example, through greater assistance to education) to the vulnerable sub-populations in the program areas.Payments for environmental services, off-farm labor supply, Grain for Green program, China, program evaluation, Environmental Economics and Policy, Farm Management, J22, O13, Q23,

Impacts of Policy Measures on the Development of State-Owned Forests in Northeastern China: Theoretical Results and Empirical Evidence

State-owned forest enterprises (SOFEs) in northeast China and Inner Mongolia play important roles both in timber production and in the maintenance of ecological security. However, since the late 1970s, forest resource and economic crises have seriously restricted these functions. Based on a theoretical and an empirical analysis of the harvest and investment behavior of the SOFEs, we examined the effects of forest policies and the socioeconomic conditions on the behavioral choices of the SOFEs. Both the extent to which SOFE supervising authorities emphasized improvement of forest resources in their annual evaluations and the increases in expenses necessary to manage SOFEs had significant impacts on harvest and investment decisions as well as development of forest resources. Promoting the management and utilization of non-timber resources, as well as reforms to increase the efficiency of forest protection and management, have reduced timber harvests as intended, which in turn has increased investment and improved forest resources. The effects have been relatively small, however. In contrast, reforms aimed at timber harvest and afforestation activities actually contributed to increasing the timber harvest, which affected the development of the forest resources negatively.state-owned forest enterprise, “double crises,” sustainable forest management, forest policy

A study on mutual information-based feature selection for text categorization

Feature selection plays an important role in text categorization. Automatic feature selection methods such as document frequency thresholding (DF), information gain (IG), mutual information (MI), and so on are commonly applied in text categorization. Many existing experiments show IG is one of the most effective methods, by contrast, MI has been demonstrated to have relatively poor performance. According to one existing MI method, the mutual information of a category c and a term t can be negative, which is in conflict with the definition of MI derived from information theory where it is always non-negative. We show that the form of MI used in TC is not derived correctly from information theory. There are two different MI based feature selection criteria which are referred to as MI in the TC literature. Actually, one of them should correctly be termed "pointwise mutual information" (PMI). In this paper, we clarify the terminological confusion surrounding the notion of "mutual information" in TC, and detail an MI method derived correctly from information theory. Experiments with the Reuters-21578 collection and OHSUMED collection show that the corrected MI method’s performance is similar to that of IG, and it is considerably better than PMI

Are the poor benefiting from China\u27s land conservation program?

This paper studies the impact of the largest conservation set-aside program in the developing world: China\u27s Grain for Green program, on poverty alleviation in rural areas. Based on a large-scale survey, we find that the program was implemented mostly in the areas of China that are fairly poor. In addition, we show that income from livestock activities and some types of asset holdings of participants have increased significantly more than those of non-participants (due to program effects). Only weak evidence is provided demonstrating that participating households have begun to shift their labor into the off-farm sectors. Overall, the results suggest that the program has been moderately successful in achieving its poverty alleviation objectives

Effect of magnetostatic field on microstructure of 5005 aluminum alloy sheet by roll-casting

The roll-casting technology of 5000 series aluminum alloy is one of the difficulties at present. Roll-casting technology was employed in this paper and high quality 5005 aluminum alloy sheets were fabricated successfully under different conditions. The solidification of melt in roll-casting process is the rapid directional solidification. The effect of magnetostatic field on microstructure of 5005 aluminum alloy sheet by roll-casting has been investigated and analyzed. The results indicate that imposing magnetostatic field can refine the grains of 5005 aluminum alloy

Enhanced Tracking and Beamforming Codebook Design for Wideband Terahertz Massive MIMO System

True-time-delay (TTD) lines are recently applied inside Terahertz (THz) hybrid-precoding transceiver to acquire high beamforming gain against beam squint effect. However, beam tracking turns into a challenging puzzle where enormous potential beam directions bring about unacceptable overhead consumption. Frequency-scanning-based beam tracking is initially explored but still imperfect in previous studies. In this paper, based on TTD-aided hybrid precoding structure, we give an enhanced frequency-scanning-based tracking scheme. Multiple beams are generated and utilized simultaneously via several subcarriers for tracking at one timeslot. The squint beams' angular coverage at all subcarriers can be flexibly controlled by two different subcarrier-angular mapping policies, named forward-pairing and backward-pairing. Then multiple physical directions can be simultaneously searched in one timeslot for lower overhead consumption. Besides, closed-form searching radius bound, parameter configuration and interferences are theoretically analyzed. Furthermore, we provide the coupled codebook design for TTDs and phase shifters (PSs), with joint consideration of both beamforming and tracking. Analytical and numerical results demonstrate the superiority of the new frequency-scanning-based tracking scheme and beamforming codebook.Comment: This work has been submitted to the IEEE journal for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessibl

ADMM Training Algorithms for Residual Networks: Convergence, Complexity and Parallel Training

We design a series of serial and parallel proximal point (gradient) ADMMs for the fully connected residual networks (FCResNets) training problem by introducing auxiliary variables. Convergence of the proximal point version is proven based on a Kurdyka-Lojasiewicz (KL) property analysis framework, and we can ensure a locally R-linear or sublinear convergence rate depending on the different ranges of the Kurdyka-Lojasiewicz (KL) exponent, in which a necessary auxiliary function is constructed to realize our goal. Moreover, the advantages of the parallel implementation in terms of lower time complexity and less (per-node) memory consumption are analyzed theoretically. To the best of our knowledge, this is the first work analyzing the convergence, convergence rate, time complexity and (per-node) runtime memory requirement of the ADMM applied in the FCResNets training problem theoretically. Experiments are reported to show the high speed, better performance, robustness and potential in the deep network training tasks. Finally, we present the advantage and potential of our parallel training in large-scale problems