Metal-organic framework-derived Ni 2 P/nitrogen-doped carbon porous spheres for enhanced lithium storage

Transition metal phosphides (TMPs)/carbonaceous matrices have gradually attracted attention in the field of energy storage. In this study, we presented nickel phosphide (Ni2P) nanoparticles anchored to nitrogen-doped carbon porous spheres (Ni2P/NC) by using metal-organic framework-Ni as the template. The comprehensive encapsulation architecture provides closer contact among the Ni2P nanoparticles and greatly improves the structural integrity as well as the electronic conductivity, resulting in excellent lithium storage performance. The reversible specific capacity of 286.4 mA h g−1 has been obtained even at a high current density of 3.0 A g−1 and 450.4 mA h g−1 is obtained after 800 cycles at 0.5 A g−1. Furthermore, full batteries based on LiNi1/3Co1/3Mn1/3O2||Ni2P/NC exhibit both good rate capability and cycling life. This study provides a powerful and in-depth insight on new advanced electrodes in high-performance energy storage devices

Application of electro-hydraulic proportional control in cathode rod pulling out system of lead electrolysis

In the process of lead electrolysis, due to its production characteristics, it is necessary to extract and collect the cathode conductive rod on the cathode plate after electrolysis, so as to make it reusable. At present, most of the lead electrolytic manufacturers in China still rely on manual extraction in this process. In this study, a rapid, stable and effective cathode rod extraction equipment for lead electrolysis is designed by means of electro-hydraulic proportional technology. AMESim simulation and experimental research on the equipment are also carried out

Short-Term Phytoplankton Dynamics During Typhoon Season in and Near the Pearl River Estuary, South China Sea

The effect on phytoplankton dynamics of nutrient inputs from rivers within the highly eutrophic Pearl River Estuary (PRE) in China is well understood. However, the role that typhoons play in enhancing or reducing phytoplankton blooms is less well known. The primary factors controlling phytoplankton dynamics in the PRE in June-July 2009 were determined by coupling satellite remote sensing data with field observations during two successive typhoons: Nangka and Soudelor. The results revealed that the magnitude of chlorophyll a concentration (Chl) near the PRE was controlled by several key factors. (1) Vertical mixing of seawater induced by Typhoons Nangka and Soudelor led to a sudden decrease in Chl and phytoplankton abundance near the PRE, especially in picophytoplankton. (2) Following the typhoon events, increased nutrient availability associated with significant freshwater runoff promoted phytoplankton (especially Synechococcus) growth, recovery, and blooms in and near the PRE. (3) Increased freshwater input or easterly winds enhanced the extension of highly abundant phytoplankton with brackish water from the estuary into the adjacent nearshore water. (4) Phycocyanin-rich Synechococcus was endemic and a dominant picophytoplankton group in the estuarial brackish water. We propose a mechanism that describes the interactions of vertical mixing, terrestrial precipitation, freshwater discharge, nutrient inputs, and winds on short-term phytoplankton dynamics in and near the PRE during typhoon season

Effects of Growth Period and Germination Treatment on Saponin Content of Different Bean Varieties

In order to improve the processing and utilization value of the Northeast snap beans products by clarifying the saponin content, sites and influencing factors, this study extracted saponins from the seeds and pods of seven kinds of Northeast snap beans, including Golden Crown, Green Crown, and Sheng Crown within 10~40 d after blooming using ultrasonic-assisted methods. 0.4%~1.2% sodium chloride solution was used to conduct germination treatment under salt stress on the saponin content of Golden Crown and Mantangcai seed. Finally, ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOF-MS) was used to identify the saponin species in the seeds of Golden Crown. The results showed that saponin existed mainly in the seeds, and the saponin content increased firstly but then decreased with the increase of growth time. The peak period of saponin content varied with the bean varieties. Compared with the other six varieties of snap beans, the saponin content in the full hall was the highest, with the highest saponin content of Mantangcai whole pods of 23.62±0.14 mg/g at 35 d. The change of saponin content was closely related to the sprouting time of bean seeds and bean varieties. Salt stress treatment could significantly increase the saponin content of Mantangcai seeds from (7.08±0.15) mg/g to (10.15±0.55) mg/g. The UHPLC-Q-TOF-MS analysis showed that there were seven saponins in the crude saponins of the Golden Crown bean, including saikosaponin F, adzuki saponin II and astragaloside IV. This study provides data support for the in-depth development of soybean saponins in Northeast China