We study the process e+ e- →(D* D*)± π∓ at a center-of-mass energy of 4.26 GeV using a 827 pb(-1) data sample obtained with the BESIII detector at the Beijing Electron Positron Collider. Based on a partial reconstruction technique, the Born cross section is measured to be (137±9±15) pb. We observe a structure near the (D* D*)± threshold in the π∓ recoil mass spectrum, which we denote as the Zc±(4025). The measured mass and width of the structure are (4026.3±2.6±3.7) MeV/c2 and (24.8±5.6±7.7) MeV, respectively. Its production ratio σ(e+ e- → Zc±(4025)π∓ → (D* D*)± π∓)/σ(e+ e- → (D* D*)± π∓) is determined to be 0.65±0.09±0.06. The first uncertainties are statistical and the second are systematic.
It was not until the 1980s that China's policy makers became aware of the detrimental impacts on urban health from soil pollution as a result of industrial waste emissions. For the past three decades, the Chinese government has strived to prevent and control industrial pollution. Setting appropriate environmental policies is the key to mitigating the legacy of industrial waste emissions accumulated for three decades. In this paper, we review the development process by outlining the evolution of the policies and the resulting legal infrastructure in terms of acts, regulations, ordinances, and standards. Deficiencies of the existing policies are identified. In the early stages, environmental policies were fragmented, consisting of single-purpose laws that are narrowly focused. With time, these policies gradually evolved to become better integrated and comprehensive management plans. However, the laws emphasize contaminated site restoration instead of preventing soil pollution. The legal framework shows that the policies that are in place often lack clear mandates because the authorizations are piggybacked on environmental acts and regulations that do not directly address issues of soil pollution. Furthermore, implementation plans are impractical due to outdated soil quality standards, unclear soil cleanup goals, unenforceable liability and supervision mechanisms, limited funding, lack of transparency and public outreach, and the unreliable financial and technical capabilities of the remediation industries.Résumé : Il a fallu attendre les années 1980 avant que les décideurs politiques chinois prennent conscience des impacts néfastes sur la santé urbaine exercés par la pollution des sols provenant des émissions de rejets industriels. Au cours des trois dernières décades, le gouvernement chinois s'est efforcé de prévenir et de contrôler la pollution industrielle. La mise en place de politiques environnementales appropriées constitue la clé pour mitiger l'héritage des émissions de rejets industriels accumulés depuis pendant trois décades. Les auteurs passent en revue le processus de développement, en soulignant l'évolution des politiques et les infrastructures légales qui en résultent en termes d'actions, de règlements, d'ordonnances et de standards. On identifie de plus les faiblesses des politiques existantes. Aux premières étapes, les politiques étaient fragmentées, consistant en législations à finalités uniques étroitement ciblées. Avec le temps, ces politiques ont graduellement évolué pour se traduire en plans d'aménagement mieux intégrés et plus complets. Cependant, les lois insistent sur la restauration des sites contaminés plutôt que sur la prévention de la pollution du sol. Le cadre légal montre que les politiques en place manquent souvent de mandats clairs par ce que les autorisations s'empilent sur des actes et règlements ne s'adressant pas directement aux problèmes de la pollution des sols. De plus, la réalisation des plans n'est pas possible dû à des standards désuets sur la qualité des sols, des objectifs...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.