Intelligent Protection and Monitoring System of Lightning Disaster

Based on Internet technology,modern wireless communication technology and new sensor technology,an intelligent protection and monitoring system of lightning disaster was established to collect lightning current(lightning intensity,frequency and time),induced lightning current and leakage current of surge protector(SPD),earthing resistance,working voltage,temperature and humidity in the lightning environment and other data in real time.Through the online analysis of visual data and automatic alarm beyond the preset value of cloud platform,it can realize the intelligent online monitoring and management of lightning protection devices,providing scientific and reliable lightning protection technical support for lightning protection and disaster reduction,and ensuring the smooth development and efficient management of lightning protection safety work.

Ultrathin nanosheets of cobalt-nickel hydroxides hetero-structure via electrodeposition and precursor adjustment with excellent performance for supercapacitor

A homogeneous better-dispersed ultrathin nanosheets（ca. 5 nm） of cobalt-nickel layered double hydroxides（LDH） supported on nickel foam scaffold was synthesized using controllable electrodeposition approach for high efficiency electrode materials of new supercapacitor. The morphology and electrochemical performances of the samples can be controlled by adjusting the precursor ratio, i.e., Ni（OAc）2/Co（NO3）2 molar ratio in the electrodeposition approach. With the increase of this molar ratio, the electrochemical performances give a volcano trend. When the optimized molar ratio is 0.64/0.36, the hybrid delivered a high specific capacitance of 1587.5 F g-1 at a current density of 0.5 A g-1, with good rate capability（1155 F g-1 was retained even at 10 A g-1） and a robust recycle stability（remaining 91.5% after 1000 cycles at 5 A g-1）. The good performance could be attributed to the enlarged interlayer spacing, ultrathin nanosheets and synergistic effects between Co（OH）2 and Ni（OH）2. Furthermore, an asymmetric supercapacitor with a high energy density of 34.5 Wh kg-1 at 425 W kg-1 and excellent cycling stability of 85.4% after 5000 charge-discharge cycles at 2 A g-1 was fabricated. We believe that this fantabulous new electrode material would have encouraging applications in electrochemical energy storage and a wide readership.

Microwave-Assisted Synthesis of NiCo_2O_4 Double-Shelled Hollow Spheres for High-Performance Sodium Ion Batteries

The ternary transitional metal oxide NiCo_2O_4 is a promising anode material for sodium ion batteries due to its high theoretical capacity and superior electrical conductivity. However, its sodium storage capability is severely limited by the sluggish sodiation/desodiation reaction kinetics. Herein, NiCo_2O_4 double-shelled hollow spheres were synthesized via a microwave-assisted, fast solvothermal synthetic procedure in a mixture of isopropanol and glycerol, followed by annealing. Isopropanol played a vital role in the precipitation of nickel and cobalt,and the shrinkage of the glycerol quasi-emulsion under heat treatment was responsible for the formation of the double-shelled nanostructure. The as-synthesized productwas tested as an anode material in a sodium ion battery,was found to exhibit a high reversible specific capacity of 511 m Ahg^(-1) at 100 m Ag^(-1), and deliver high capacity retention after 100 cycles.

CUT&Tag技术在代谢组织细胞的实验操作

染色体靶向切割和标签化(clevage under target and tagment,CUT&Tag)技术利用Tn5转座酶与Protein A/G的融合蛋白,引导Tn5酶至与靶蛋白结合的抗体附近,对靶蛋白结合的附近染色质区域进行切割,随后通过标签化处理对片段化染色质进行文库制备,并利用高通量测序技术获取特定位点或蛋白质结合位置的染色质信息。CUT&Tag技术在蛋白质和DNA相互作用的研究领域起到了重大作用,不仅可以了解组蛋白修饰发生的位置,而且可以明确转录因子结合的区域。相较于传统的染色质免疫沉淀高通量测序(chromatin immunoprecipitation-sequencing,ChIP-seq)技术,CUT&Tag技术具有信噪比高、可重复性好、实验周期短、细胞投入量低等优点,在早期胚胎发育、干细胞、肿瘤以及表观遗传学等研究领域体现出巨大优势。本文将针对CUT&Tag在代谢组织细胞(以小鼠原代胰岛细胞为例)的具体操作步骤进行描述,以提供一种研究代谢细胞的表观遗传学方法。

三维稳态MHD方程和Hall-MHD方程的Liouville型定理

本文研究三维稳态情形下的磁流体动力学(magnetohydrodynamics,MHD)方程和具Hall效应的磁流体动力学(Hall-MHD)方程的Liouville型定理.在局部Morrey空间框架下,本文克服具有无限能量解的压力项的估计问题,得到若干充分条件以保证这两类方程存在唯一的平凡解.然后,利用Lorentz空间和局部Morrey空间的嵌入关系,给出这两类方程在Lorentz空间中的Liouville型定理.所得结果不需要有限Dirichlet积分条件,从而推广和改进了已有的关于这两类方程在Lebesgue空间框架下的一些结果.

How Do China's Importing Firms Respond to Non-taritf Measures?

After the formation of the World Trade Organization(WTO)in 1995,most countries gradually reduced their import tariffs to a fairly low level.However,the reduced tariffs could not he simply read as a reduction in trade barriers.Indeed,many suspect that countries tend to use more non-tariff measures(NTMs),substituting them for tariff barriers,to protect their domestic economies.This paper uses newly compiled and detailed Chinese NTM data,together with highly disaggregated firm import data and manufacturing firm operational data,to investigate the impact of China s import-related NTMs on firm imports.The main empirical results show that,as in the case of tariff barriers,China s trade policy NTMs mainly inhibit firms'intermediate imports.In contrast,China s public policy NTMs significantly improve the intensive and extensive margins of firm s intermediate imports and raise the prices and quality of imported inputs.The greater the extent to which a firm engages in processing trade,the larger is the promoting effect of public policy NTMs on the firm s import margins far intermediate inputs,and the greater is the restricting ejfect on the prices and the quality of the firm's imported inputs.

Structure Engineering in Biomass-Derived Carbon Materials for Electrochemical Energy Storage

Biomass-derived carbon materials(B-d-CMs)are considered as a group of very promising electrode materials for electrochemical energy storage(EES)by virtue of their naturally diverse and intricate microarchitectures,extensive and low-cost source,environmental friendliness,and feasibility to be produced in a large scale.However,the practical application of raw B-d-CMs in EES is limited by their relatively rare storage sites and low diffusion kinetics.In recent years,various strategies from structural design to material composite manipulation have been explored to overcome these problems.In this review,a controllable design of B-d-CM structures boosting their storage sites and diffusion kinetics for EES devices including SIBs,Li-S batteries,and supercapacitors is systematically summarized from the aspects of effects of pseudographic structure,hierarchical pore structure,surface functional groups,and heteroatom doping of B-d-CMs,as well as the composite structure of B-d-CMs,aiming to provide guidance for further rational design of the B-d-CMs for high-performance EES devices.Besides,the contemporary challenges and perspectives on B-d-CMs and their composites are also proposed for further practical application of B-d-CMs for EES devices.

Mesoporous carbon nanosheet-assembled flowers towards superior potassium storage

Potassium-ion batteries(PIBs)are attracted tremendous interest for large-scale energy storage systems(ESSs)owing to their economic merits.However,the main challenges of the PIBs are sluggish K-ion diffusion and large volume variations in the potassium repeated intercalation/deintercalation.Herein,mesoporous carbon nanosheet-assembled flowers(abbreviated as F-C)are designed as an original anode for superior-performance PIBs.Specifically,the F-C anode exhibits a high K-storage capacity(e.g.,381 mAh/g at 50 mA/g during the 2^(nd)cycle),excellent rate performance(e.g.,101 mAh/g at 2.0 A/g)and superior long cycle capability.Such excellent K-ion storage property is largely benefited from the large surface area(~141 m^(2)/g)and reasonable pore volume(0.465 cm^(3)/g),which not only stimulates rapid Kions diffusion and relieves the huge volume strain,but also exposes extensive active sites for K-ion capacitive storage.