Publish in OALib Journal
APC: Only $99
Contamination of agricultural soil has been a worldwide concern, and phytoremediation is a promising alternative to conventional soil clean-up technology as a low cost and environment-friendly technology. However, the field application of phytoremediation is still limited, because of its low efficiency and long-period needed. In this paper, with discussion of the characteristics, mechanisms and development of phytoremediation, we suggested a profitable phytoremediation strategy using biofuel crops for both utilization and remediation of contaminated soil. In this strategy, the owners of contaminated sites possibly cost nothing, but obtain income through selling the biofuel crop for factories produced biofuel, thus the practical application of phytoremediation can be effectively promoted. In order to test the feasibility of the suggested strategy, a hydroponic cultural experiment and a pot experiment were carried out to assess the phytoremediation potential of some biofuel crops. The hydroponic cultural experiment showed that the two biofuel plants, sunflower and maize, had a better or similar accumulation level of Pb, Cu and Cd than the two accumulator plants. The pot cultural experiment showed that wheat and barley with white-rot-fungus inoculation greatly promoted crop biomass, soil microbial population, and dioxins removal efficiency. These results indicate that phytoremediation using biofuel plants possibly works effectively for remediation of contaminated soils as well as provide economic benefits to the owners of contaminated sites. Therefore, biofuel crops would be a reasonable choice for phytoremediation of contaminated soils.
Phytoremediation is an
eco-friendly and low-cost biotechnology using plants to extract, contain,
degrade, or immobilize pollutants from the contaminated environment. Selection
of the ideal plant species and suitable enhancing measures to obtain high
remediation efficiency and large valuable biomass are essential requirement for
a successful phytoremdaition. Sorghum (Sorghum bicolor L.) is one of the most
attractive bioenergy crops for producing biofuels with high biomass production.
In this study, the phytoremediation potential of sorghum to heavy metals and
the promotion effects by a lead-tolerant fungus (LTF) were investigated using a
multiple heavy metal contaminated soil with Pb, Ni, and Cu. The results showed
that the sorghum survived the heavy contamination, and LTF inoculation promoted
the plant growth and increased the phytoextraction yields of Pb, Ni, and Cu.
The phytoextraction potential (μg/plant) of the whole sorghum for Sorghum were
410 (Pb), 74 (Ni), and 73 (Cu), and for Sorghum with LTF inoculation were 590
(Pb), 120 (Ni), and 93 (Cu), respectively. The results suggested that sorghum
would be one of the ideal candidates for phytoremediation of contaminated soil
because of its high phytoremediation potential, large biomass production, and
utilization in biofuel production.
In this paper we consider the
existence of a global periodic attractor for a class of infinite dimensional
dissipative equations under homogeneous Dirichlet boundary conditions. It is
proved that in a certain parameter, for an arbitrary timeperiodic driving
force, the system has a unique periodic solution attracting any bounded set
exponentially in the phase space, which implies that the system behaves exactly
as a one-dimensional system. We mention, in particular, that the obtained
result can be used to prove the existence of the global periodic attractor for
abstract parabolic problems.
In this paper, we study the existence of exponential attractors for strongly damped wave equations with a time-dependent driving force. To this end, the uniform H?lder continuity is established to the variation of the process in the phase apace. In a certain parameter region, the exponential attractor is a uniformly exponentially attracting time-dependent set in the phase apace, and is finite-dimensional no matter how complex the dependence of the external forces on time is. On this basis, we also obtain the existence of the infinite-dimensional uniform exponential attractor for the system.
In recent years, Corporate Social
Responsibility (CSR) has gradually become a hot topic with the public’s increasing
concern. In this study, authors briefly introduce some reviews and concepts of
CSR, and then combine the idea of Game Theory and Matrix linear equations
method to conduct an empirical analysis between enterprises with enterprises
and enterprises with government. By analysis, we find that it is very important for the development
of enterprises in these two parts: the fulfillment of social responsibility and
the supervision of government. Finally, the authors also put forward some
suggestions to the fulfillment of CSR and hope to improve the poor sense of
problems of the employees of the new generation are increasingly becoming the focus of managers, because they go to work
and gradually become the main force in the labor market. However, special
social-economic background has given the crowd a few generational features,
which require us to explore the incentive work of the new generation with a
whole new perspective. In addition, our country is a country which attaches
great importance to the cultural inheritance and the traditional national
culture deeply affects every generation in different degree. The social
structure of the structure of grade as an important part of traditional Chinese culture is bound to be a
unique impact on the employees of the new generation. So, this paper will elaborate the incentive
problems of the new generation mainly
from the perspective of the China’s social structure (the structure of grade)
and theory of cognitive dissonance.