Adapt to New Normal State of Environmental Protection,Fight a Tough Fight,and Make Full Efforts to Build a Beautiful Xi'an

In China, economic growing speed converts from high speed to moderate and high speed; economic structure enters from moderate and low end to moderate and high end; development power converts from investment drive to innovation drive, and investment of resource and environ- ment factors presents declining trend. Spatial pattern of economy development is changing greatly, which needs eco-civilization construction and en- vironmental protection field continuously adjusting focus, environmental rules and laws correspondingly regulating, eco-civilization construction and environmental protection field also entering into new normal state. It requires scientifically understanding, actively adapting to and responding to new normal state of eco-civilization construction and environmental protection,and fighting a tough fight. Firstly, we should handle with the relationship between environment and economy, and strive to explore the way of environmental protection. Secondly, we should insist protection priority and prevention oriented,and promote transformation of environmental management strategy. Finally, we should accelerate to promote eco-civilization system reform and environmental protection management system reform, and further promote environmental protection work in Xi＇an on new level from eight aspects.

New neuroprotective perspectives in fighting oxidative stress and improving cellular energy metabolism by oleocanthal

Neurodegenerative diseases are a heterogeneous group of disorders characterized by a progressive dysfunction and death of neural cells which lead to compromised motor or cognitive function.Morphologically,the loss of neuron is associated with both gliosis and,frequently,with abnormal accumulation of extracellular and intracellular filamentous deposit in specific cell types.With a rapidly increasing aging population,these diseases are becoming a primary health problem(Albers and Beal,2000).

Effect of Butylated Hydroxytoluene on Survival of Frozen-TIhawed Fighting Bull Spermatozoa

The aim of the present study was to evaluate effect of 3 levels of butylated hydroxytoluene （BHT） supplemented in extender for fighting bull semen. Ejaculates were obtained from 10 healthy fighting bulls by artificial vagina. Semen with motility of more than 70% was included in the experiment. Tris-fructose-glycerol-egg yolk extender containing 0, 1, 3 and 7 mM BHT was used to dilute semen to final concentration of 200 × 10^6 cells/ml. Diluted semen was frozen in 0.25 mL straws and frozen semen was thawed in a 37 ℃ water bath for 15 sec before being evaluated at 0 and 1 hour. Sperm motility at 0 and 1 hour after thawing did not differ among groups tested （ranged 47.86-53.57 and 21.79-24.29 respectively）. At 0 hour after thawing, percentage of live sperm of 3 mM BHT （37.39% ± 2.91%） was lower than those of 0 and 1 mM BHT （43.71%± 2.76% and 41.46% ±2.59% respectively, P 〈 0.05） but not different from 7 mM BHT （40.89%± 2.50%）. The effect was more significant at 1 hour after thawing and 3 mM BHT （32.07% ± 2.45%） suppressed live cells more than other concentrations （ranged 35.07%-37.46%, P 〈 0.05）. At 0 hour after thawing, percentage of membrane integrity （hypo-osmotic swelling test） was not affected by BHT concentration （ranged 23.89%-28.54%）. However, at 1 hour after thawing, percentage of membrane integrity of 3 mM BHT （19.75% ± 1.41%） was lower that of 7 mM BHT （23.29% ± 1.88%, P 〈 0.05） but not different from those of 0 and 1 mM BHT （20.32% ±1.81% and 22.07% ± 2.27% respectively）. No significant effect was found on percentage of abnormal sperm. There was no effect of BHT supplementation in extender on most of the Hamilton-thorn motility analyser parameters. It may be concluded that 3 mM BHT can be harmful to fighting bull spermatozoa and lower concentrmion can be used without detrimental effect. Further study may be needed to verify use of BHT in lower range of concentrations.

China Focus:China′s MA60 Firefighting Aircraft Moves One Step Closer To Obtaining Certification

BEIJING,Dec.20 (Xinhua)——China′s independently-developed MA60 firefighting aircraft,a new member of the Modern Ark multipurpose aircraft family,is progressing forward on its airworthiness certification process,according to the Aviation Industry Corporation of China (AVIC).As an aircraft model tailored to serve emergency rescue missions,MA60 successfully completed a key test flight,which consisted of hedgehopping and dropping six tonnes of water,said the AVIC,China′s leading aircraft manufacturer.The aircraft successfully conducted the water drop over the scheduled site at a very low altitude of 55 meters.The test took place at an airport in southwest China′s Sichuan Province.

Effects of Light Rare Earth on Acidity and Catalytic Performance of HZSM-5 Zeolite for Catalytic Cracking of Butane to Light Olefins

The effects of rare earth（RE）on the structure,acidity,and catalytic performance of HZSM-5 zeolite were investigated.A series of RE/HZSM-5 catalysts,containing 7.54% RE（RE=La,Ce,Pr,Nd,Sm,Eu or Gd）,were prepared by the impregnation of the ZSM-5 type zeolites（Si/Al=64：1）with the corresponding RE nitrate aqueous solutions.The catalysts were characterized by means of FT-IR,UV-Vis,NH3-TPD,and IR spectroscopy of adsorbed pyridine.The catalytic performances of the RE/HZSM-5 for the catalytic cracking of mixed butane to light olefins were also measured with a fixed bed microreactor.The results revealed that the addition of light rare earth metal on the HZSM-5 catalyst greatly enhanced the selectivity to olefins,especially to propylene,thus increasing the total yield of olefins in the catalytic cracking of butane.Among the RE-modified HZSM-5 samples,Ce/HZSM-5 gave the highest yield of total olefins,and Nd/HZSM-5 gave the highest yield of propene at a reaction temperature of 600℃.The presence of rare earth metal on the HZSM-5 sample,not only modified the acidic properties of HZSM-5 including the amount of acid sites and acid type,that is,the ratio of L/B（Lewis acid/Brnsted acid）,but also altered the basic properties of it,which in turn promoted the catalytic performance of HZSM-5 for the catalytic cracking of butane.

Whole-genome resequencing infers genomic basis of giant phenotype in Siamese fighting fish(Betta splendens)

Understanding the genetic basis of phenotypes is of importance in evolutionary biology and for genetic improvement of economically valuable animals.The giant phenotype of the fighting fish,Betta splendens,provides a unique opportunity to explore the genetic architecture of overgrowth in body size.As such,we re-sequenced and analyzed the genomes of 54 fighting fish.Genome-wide FST and selective sweep analyses using 3582429 DNA variants revealed three genomic regions at chr1,chr9,and chr11 that were associated with the giant phenotype.With a total length of~3.5 Mb,these regions showed high divergence between the giant and non-giant bettas.In contrast,no signature of selection was detected in the wild-type fish.Transcriptome analysis of brain and muscle samples from giant and normal bettas identified 14 candidate genes that were likely responsible for the giant phenotype.Overall,our data provide novel insights into the genetic basis of body size variation.The genome sequences,transcriptome sequences,DNA sequence variants,and candidate genes for body size provide valuable resources for further biological and evolutionary studies,as well as for rapid improvement in growth-related traits.

Three-Dimensional Kinematics Simulation of Robot Fighting Platform in Virtual Environment

A method of 3 D kinematics simulation of robot fighting platform （RFP） in virtual environment is proposed with the aim of enhancing vision telepresence. Based on the theory of space coordinate transformation, kinematics equat!ons of RFP are formulated; followed by applying a method of modeling using 3DMAX software to build an RFP＇s 3D geometric model before a 3D kinematics simulation system of RFP is completed based on virtual reality technology and Open Inventor VC ＋ ＋. Test results have indicated that this system can perform RFP＇s kinematics simulation in virtual environment. It can also imitate RFP＇s motion states and environmental features well. Moreover, not only can better real-time performances and interactions be achieved but also operator＇s vision telepresence be enhanced, therefore this approach may help lay the foundation for the realization of RFP＇s teleoperation with vision telepresence.

Research and Design of Coordinated Control Strategy for Smart Electromechanical Actuator System

In order to improve the frequency response and anti-interference characteristics of the smart electromechanical actuator(EMA)system,and aiming at the force fighting problem when multiple actuators work synchronously,a multi input multi output(MIMO)position difference cross coupling control coordinated strategy based on double‑closed-loop load feedforward control is proposed and designed.In this strategy,the singular value method of return difference matrix is used to design the parameter range that meets the requirements of system stability margin,and the sensitivity function and the H_(∞)norm theory are used to design and determine the optimal solution in the obtained parameter stability region,so that the multi actuator system has excellent synchronization,stability and anti-interference.At the same time,the mathematical model of the integrated smart EMA system is established.According to the requirements of point-to-point control,the controller of double-loop control and load feedforward compensation is determined and designed to improve the frequency response and anti-interference ability of single actuator.Finally,the 270 V high-voltage smart EMA system experimental platform is built,and the frequency response,load feedforward compensation and coordinated control experiments are carried out to verify the correctness of the position difference cross coupling control strategy and the rationality of the parameter design,so that the system can reach the servo control indexes of bandwidth 6 Hz,the maximum output force 20000 N and the synchronization error≤0.1 mm,which effectively solves the problem of force fighting.

Discussion on the Application of Technical and Tactical Skills in Mixed Martial Arts Competitions

This article mainly analyzes the application of technical and tactical skills in mixed martial arts competitions,including mixed martial arts and its competition characteristics,the main application significance of technical and tactical skills in mixed martial arts competitions,and its primary application strategies.It is hoped that this analysis can provide some guidelines for the appropriate application of mixed martial arts athletes’technical and tactical skills to improve their winning rate in mixed martial arts competitions.

啮齿类动物Playfighting的行为学研究进展

Playfighting是一种常见的社会性互动形式,具有互惠性和合作性等特点。其贯穿于动物的整个生命周期,并且会通过影响动物的社交、认知和运动等进一步影响大脑的执行功能。啮齿类动物的playfighting行为因具有易识别、易量化等特点,而被广泛研究。本文主要以大鼠和金仓鼠为例,整理概述了近年来啮齿类动物playfighting行为的研究现状,包括行为模式及其相关影响因素,希望为今后进一步研究playfighting行为提供参考。

Using Link Analysis Technique with a Modified Shortest-Path Algorithm to Fight Money Laundering

Effective link analysis techniques are needed to help law enforcement and intelligence agencies fight money laundering. This paper presents a link analysis technique that uses a modified shortest-path algorithms to identify the strongest association paths between entities in a money laundering network. Based on two-tree Dijkstra and Priority＇First-Search （PFS） algorithm, a modified algorithm is presented. To apply the algorithm, a network representation transformation is made first.

Promoting the fighting spirit against the pandemic and planning a new chapter of nursing

2020 has been an extraordinary year.After the outbreak of the coronavirus disease 2019(COVID-19),vast numbers of nurses have made an exceptional contribution to improving the recovery and reducing the mortality of patients.On International Nurses Day,President Xi Jinping extended festive congratulations and sincere condolences to nurses nationwide,and fully affirmed their important contributions in winning the battle against the pandemic in China and ensuring the safety and health of people in all countries.This is a great encouragement to us.We will bear in mind the President’s instructions,implement the fighting spirit against the pandemic in our work,insist on the people’s supremacy,importance of putting life first,and ensure the health of the people.

Comparison of the Anthelmintic Efficacy of Three Commercial Products against Ascarids and Capillaria SPP. in Fighting Cocks

The aim of the present study was to evaluate the anthelmintic efficacy of three commercial compounds against ascarids and Capillaria spp. in naturally infected fighting cocks from Mexico. First experiment.- Forty cocks were selected on the basis of eggs per gram (EPG) counts quantified by the McMaster method. On day 0 the birds were divided into four groups of 10 cocks, each subjected to the treatments. Group 1 received a single oral dose of 1 mg of ivermectin, 25 mg of praziquantel and 40 mg of fenbendazole given in tablets according to body weight (b.w). Group 2 was treated with a single oral dose of 1 mg of ivermectin, 25 mg of praziquantel and 40 mg of fenbendazole given in tablets/b.w. but formulated with a different excipient. Group 3 received a single tablet containing 0.2 mg of abamectin and 30 mg of albendazole. Group 4 served as a non-treated control. Fecal analyses were carried out on days 0 (day of treatment), 7, 14, 21 and 28, being collected from the floor where the cocks were individually caged. Efficacy was measured on the percentage of egg reduction from day 0 with respect the EPG counts from the control group. In a second experiment the study was similarly performed using another cock-farm located at approximately 300 km away from the first one. Results indicated an overall efficacy of 100%, 94.0% and 100% for groups 1, 2 and 3 in the first experiment and 100%, 100%, 100% for groups 1, 2 and 3 of the 2nd experiment, respectively. It is concluded that all drugs used exerted high efficacy in fighting cocks naturally infected with helminths.

Reduction of serotonergic gene expression in the raphe nuclei of the midbrain under positive fighting experience in male mice

The concept of a major inhibitory role of serotonin in aggressive behavior is widely accepted by investigators. There was ample evidence that a pharmacologically-induced increase in the serotonin activity attenuates agonistic behavior in animals, and that the manipulations inhibiting the brain serotonergic system can elicit aggressiveness in male mice and rats. Repeated experience of aggression in daily agonistic interactions has been shown to reduce serotonin activity in brain of victorious male mice. The study aimed to analyze expression of the serotonergic genes -Tph2, Sert, Maoa and Htr1a, as well as the Bdnf and Creb genes in the midbrain raphe nuclei of male mice with positive fighting experience in daily encounters and male mice with the same track record of aggression followed by two-week no-fight period. It has been shown that mRNA levels of the serotonergic and Creb genes are reduced in the winners in comparison with male mice without consecutive positive fighting experience of aggression. After the fighting deprivation the Tph2, Sert, Bdnf and Creb genes recover their expression while mRNA levels of the Maoa and Htr1a genes proceed at a significantly higher level as compared with the respective controls. Downregulation of serotonergic genes is indicative of the inhibition of serotonergic activity under repeated experience of aggression. Nevertheless recovering of Tph2 and Sert gene expression and overexpression of the Maoa and Htr1a genes after no-fight period suggest that changes in brain serotonergic activity are not main cause of the behavioral pathology developing in male mice in this experimental context.

China Will Fight to the End If US Keeps Escalating Trade Frictions: MOC

“China will fight to the end if the United States continues to escalate trade frictions,”the Ministry of Commerce(MOC)said recently.China will not give ground on issues of principle during bilateral economic and trade talks,which are clearly stated in a white paper on bilateral trade consultations issued earlier this month,MOC spokesperson Gao Feng said.In response to the new threat of tarrifs by the United States,Gao said China is firmly against US unilateralism and bullying.

Bringing the East and West Together in Shared Commitment to Multilateralism

With rigorous and thorough measures taken, China has full confidence, capacity and determination to defeat the novel coronavirus outbreak. With strong resilience, potential and vitality, the Chinese economy is well positioned to overcome all risks and challenges. As human society has entered the age of globalization, we must transcend the East-West divergence and the North-South divide, to see our shared planet as a community for all.

Jointly Fighting Against the Epidemic and Tiding Over the Hard Times

While the whole world is fighting against the epidemics,China is demonstrating China's spirit,China's bearing and China's responsibility.With Chinese action,China is demonstrating that it is to join hands with the world to tide over the hard times.