Agricultural information dissemination using ICTs: a review and analysis of information dissemination models in China

Open Access funded by China Agricultural UniversityOver the last three decades, China’s agriculture sector has been transformed from the traditional to modern practice through the effective deployment of Information and Communication Technologies (ICTs). Information processing and dissemination have played a critical role in this transformation process. Many studies in relation to agriculture information services have been conducted in China, but few of them have attempted to provide a comprehensive review and analysis of different information dissemination models and their applications. This paper aims to review and identify the ICT based information dissemination models in China and to share the knowledge and experience in applying emerging ICTs in disseminating agriculture information to farmers and farm communities to improve productivity and economic, social and environmental sustainability. The paper reviews and analyzes the development stages of China’s agricultural information dissemination systems and different mechanisms for agricultural information service development and operations. Seven ICT-based information dissemination models are identified and discussed. Success cases are presented. The findings provide a useful direction for researchers and practitioners in developing future ICT based information dissemination systems. It is hoped that this paper will also help other developing countries to learn from China’s experience and best practice in their endeavor of applying emerging ICTs in agriculture information dissemination and knowledge transfer

The Prism of Violence: Private Gun Ownership in Modern China, 1860-1949

This dissertation examines private gun ownership and its sociocultural and political implications in modern China from 1860 to 1949, a period characterized by foreign invasion, constant military conflicts, and political decentralization. During this period, foreign guns, along with their Chinese imitations, flooded society. In response to the social disorder, many Chinese civilians turned to this new class of weaponry for self-defense. While historians have understood the gun in China in terms of military modernization, this dissertation sets the privately-owned gun in its social and political context, and studies why Chinese civilians chose to arm themselves with guns and how governments of different periods responded to their armed civilians. This study argues that growing social violence and the state’s inability to respond to it led Chinese men and women seek to obtain their own weapons. This demand was fueled by the gun’s powerful symbolism in public culture and social life, and by beliefs that guns were a source of social status and self-empowerment. Civilian ownership of guns contributed to persistent social violence, and also transformed power structures in local society and accelerated local militarization, impacting the balance between state and society. Both late Qing and Republican governments’ regulation and control over armed civilians was a dynamic and contingent process, hovering between two practices: the state’s resolute maintenance of its monopoly on the uses of guns, and its reliance on armed civilians in local defense. This study argues that the state’s dilemma over whether to control private guns or rely on them prevented the formation of an effective and consistent gun policy. In contrast, the Chinese Communist Party (CCP) adopted a different policy towards private gun ownership, by making the mobilization of an armed populace part of its massline policy. The CCP’s private gun policy played an important role in strengthening the CCP’s presence and authority in wartime China. Drawing from a variety of sources such as government documents, legal cases, social survey reports, and popular writings, this study chronicles both the state efforts to deal with armed civilians and the reactions from the bottom. This dissertation engages with and complements wider research on modern Chinese history in examining violence, social life, and the dynamic state-society relationship

Simplified TeV leptophilic dark matter in light of DAMPE data

Using a simplified framework, we attempt to explain the recent DAMPE cosmic $e^+ + e^-$ flux excess by leptophilic Dirac fermion dark matter (LDM). The scalar ($\Phi_0$) and vector ($\Phi_1$) mediator fields connecting LDM and Standard Model particles are discussed. Under constraints of DM relic density, gamma-rays, cosmic-rays and Cosmic Microwave Background (CMB), we find that the couplings $P \otimes S$, $P \otimes P$, $V \otimes A$ and $V \otimes V$ can produce the right bump in $e^+ + e^-$ flux for a DM mass around 1.5 TeV with a natural thermal annihilation cross-section $\sim 3 \times 10^{-26} cm^3/s$ today. Among them, $V \otimes V$ coupling is tightly constrained by PandaX-II data (although LDM-nucleus scattering appears at one-loop level) and the surviving samples appear in the resonant region, $m_{\Phi_1} \simeq 2m_{\chi}$. We also study the related collider signatures, such as dilepton production $pp \to \Phi_1 \to \ell^+\ell^-$, and muon $g-2$ anomaly. Finally, we present a possible $U(1)_X$ realization for such leptophilic dark matter.Comment: discussions added, version accepted by JHE

Integrating phytoremediation with biomass valorisation and critical element recovery: A UK contaminated land perspective

In the UK, the widespread presence of elemental contaminants such as arsenic and nickel in contaminated sites and more widely release of platinum group metals into the biosphere are growing concerns. Phytoremediation has the potential to treat land contaminated with these elements at low cost. An integrated approach combining land remediation with post-process biomass to energy conversion and high value element recovery is proposed to enhance the financial viability of phytoremediation. An analytical review of plant species suitable for the phytoremediation of nickel, Arsenic and platinum group metals is reported. Additionally, a preliminary model is developed to assess the viability of the proposed approach. A feasibility appraisal using Monte Carlo simulation to analyse project risk suggests high biomass yield plant species can significantly increase the confidence of achieving financial return from the project. The order of financial return from recovering elements was found to be: Ni > Pt > As

Solid–gaseous phase transformation of elemental contaminants during the gasification of biomass

Disposal of plant biomass removed from heavy metal contaminated land via gasification achieves significant volume reduction and can recover energy. However, these biomass often contain high concentrations of heavy metals leading to hot-corrosion of gasification facilities and toxic gaseous emissions. Therefore, it is of significant interest to gain a further understanding of the solid–gas phase transition of metal(loid)s during gasification. Detailed elemental analyses (C, H, O, N and key metal/metalloid elements) were performed on five plant species collected from a contaminated site. Using multi-phase equilibria modelling software (MTDATA), the analytical data allows modelling of the solid/gas transformation of metal(loid)s during gasification. Thermodynamic modelling based on chemical equilibrium calculations was carried out in this study to predict the fate of metal(loid) elements during typical gasification conditions and to show how these are influenced by metal(loid) composition in the biomass and operational conditions. As, Cd, Zn and Pb tend to transform to their gaseous forms at relatively low temperatures ( 1200 °C). Simulation of pressurised gasification conditions shows that higher pressures increase the temperature at which solid-to-gaseous phase transformations takes place.The authors wish to thank the UK Engineering and Physical Sciences Research Council (EPSRC) for the financial support to carry out this work through grant number EP/K026216/1 (Cleaning Land for Wealth) and a SUPERGEN Bioenergy Hub Small Grant