What are the procedures and trends for obtaining approval imported genetically modified (GM) crops in China, how do dates length of China compare with those other countries? The answers crucial current food security future derived by gene editing.

Abstract Declining arable land and yield stagnation pose serious challenges to food security in China. Since 2004, the Chinese government has introduced rice support policies stimulate production. A bundle of incentives, including a minimum procurement price, were introduced. Whether they effective? Rice acreages have increased since start this policy, which could also result from rising price levels both nationally globally. Using natural experiment created by policy being selected set...

Agricultural price forecasting plays an important role in stabilising markets and ensuring food security. It provides insights for various stakeholders to optimise planting choices, allocate resources efficiently mitigate potential risks. However, during safety incidents poses unique challenges. This study focused on a case of tuna fraud Spain 2017, which caused 105 people fall ill influenced consumer behaviour fish purchases. To forecast prices incident fraud, we used artificial neural...

We examine stakeholder participation in the online debate on genetically modified organisms China and assess how has changed over time. Therefore, we compare messages posted between 2013 2020 Chinese microblog website Weibo by using discourse network analysis. Our findings reveal strong opposition to crops, along with existence of two competing coalitions supporters opponents. further observe an increasing number posts supporting public recent years. Consequently, there is indication that...

Abstract In order to tackle climate change and biodiversity loss, the European Union (EU) promotes extensive farming. However, identifying such farms across countries assessing their performance for policy purposes remains challenging. This paper combines a latent class stochastic frontier model (LCSFM) with novel nested metafrontier approach. The resulting enables identification of intensive countries, estimation farm efficiency different technology gaps. Based on Farm Accountancy Data...

An exact real-space renormalization-group approach is developed to calculate the local Green's function and density of states at any site in an infinite Fibonacci chain, which three basic renormalization transformations ${\mathit{T}}_{\mathrm{\ensuremath{\alpha}}}$, ${\mathit{T}}_{\mathrm{\ensuremath{\beta}}}$, ${\mathit{T}}_{\ensuremath{\gamma}}$ are introduced. Transformations ${\mathit{T}}_{\mathrm{\ensuremath{\beta}}}$ divide chains different generations into two distinct subclasses with...

Electronic properties of the generalized Fibonacci lattices are studied using dynamical system technique, for which off-diagonal tight-binding model is employed. The matrix and trace maps obtained investigated in a unified way. It found that energy spectra Cantor-like wavefunctions critical at many energies. For some systems, it also shown there extended localized wavefunctions. In addition, according to degree spatial extension or localization, two other types further distinguished, one has...

Symmetry reduction method is one of the best ways to find exact solutions. In this paper, we study possibility symmetry reductions well known Burgers equation including nonlocal symmetry. The related new group invariant solutions are obtained. Especially, interactions among solitons, Airy waves, and Kummer waves explicitly given.

We assess the cost of postponement Bt rice commercialization in China between years 2009 and 2019 by taking into account external costs pesticide use potential technology spillovers rice. estimate analyzed period to be up 12 billion US dollars per year. Our estimates can contribute societal debate on GM crops China.

The Kohmoto-Kadanoff-Tang renormalization-group method is extended to study the phonon properties of a class one-dimensional quasiperiodic systems. Two models are employed, which correspond equation motion for problems with spring constants equal and two types masses arranged successively in generalized Fibonacci sequences, that sequences. It shown spectra systems Cantor-like do not have uniform scalings. Particularly low-lying excitations tend be low-frequency limit.

The interaction between two Wu's solitons is derived by using the least-action principle approach as a function of distance solitons, which shows that pair with same polarity always attract each other, while those opposite repel (if larger than certain value). It further pointed out both attraction and repulsion short distance, period mutual oscillation caused increases from zero to infinity initial rises. All above results are well coincident experiment.

As an extension of the Thue-Morse lattice, authors consider generalized lattices associated with sequences Sx given by recursion relation Sl+1=(Sln,Slm)> for l>or=0 S0=(AB), in which m and n are positive integers Sl is complement obtained interchanging A B Sl. unified trace map derived to study electronic energy spectra diagonal tight-binding model. The results show that exhibit a new kind self-similarity.

The Burgers equation is one of the most important prototypic models in nonlinear physics. Various exact solutions have been found by many methods. However, it very difficult to find interactive among different types excitations. We develop a generalized tanh function expansion approach, which can be considered as Bäcklund transformation, between soliton and other waves.

We investigate the renormalization group of generalized Fibonacci lattices associated with aperiodic sequences as constructed by inflation rule: {A,B}\ensuremath{\rightarrow}{${\mathit{A}}^{\mathit{n}}$${\mathit{B}}^{\mathit{m}}$,A}, in which m and n are positive integers. The derived consists 2n(n+m-1)+1 basic renormalization-group transformations. By suitable combinations these transformations, local Green's function density states at any sites can be calculated for electrons on lattices....

The authors study the local electronic properties of a family generalized Fibonacci lattices associated with sequences which are given by inflation rule (A,B) to (ABn,A), where n is an arbitrary positive integer greater than one. A unified real-space renormalization-group approach presented calculate Green function and density states at any site.

We study the quantum Heisenberg-Ising models on generalized Fibonacci lattices by dynamical-maps technique, in which nearest-neighbor Ising interactions take two values that follow successively sequences. The energy spectra are Cantor-like, and wave functions generally critical. It is further shown do not have uniform scalings for some systems extended or localized certain regions. In addition, we also obtain critical lines of quasiperiodic models.

A real-space renormalization group (RSRG) scheme is developed to calculate the local Green's functions for electrons in two-dimensional quasi-crystals. The RSRG transformations are derived terms of inflation rule electronic densities states at some key sites presented, which match numerical results obtained by other groups global energy spectra

A new exact real-space renormalization group approach is presented for the local phonon properties of any given site in an infinite Fibonacci chain. It found that densities states different sites are from each other, although they have same structure. Results also suggest spectrum a Cantor set.

Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) technology for rice, which makes rice resistant to its two most destructive insect pests, is an alternative insect‐resistant genetically modified (GM) rice. We advance economic framework determine ex ante the planting share of CRISPR in China under uncertainty about pest severity and analyse significant factors. Using our baseline data assumption that yields are 10 per cent lower than conventional we estimate be 37.9 cent....