A Green Path To High-Quality Development--Hainan Tibetan Autonomous Prefecture is committed to protecting and improving the ecological environment in pursuit of sustainable development

Summer is the most beautiful season in northwest China’s Qinghai Province.Placid Qinghai Lake is nestled at the foot of mighty snowy mountains and complements golden cole flower fields as well as cattle,sheep,and birds on the grassland.An achievement thanks to local ecological protection efforts,the beautiful scenery has become a strong driving force propelling the province’s high-quality development.

Univector field method-based multi-agent navigation for pursuit problem in obstacle environments

The pursuit problem is a well-known problem in computer science. In this problem, a group of predator agents attempt to capture a prey agent in an environment with various obstacle types, partial observation, and an infinite grid-world. Predator agents are applied algorithms that use the univector field method to reach the prey agent, strategies for avoiding obstacles and strategies for cooperation between predator agents. Obstacle avoidance strategies are generalized and presented through strategies called hitting and following boundary(HFB); trapped and following shortest path(TFSP); and predicted and following shortest path(PFSP). In terms of cooperation, cooperation strategies are employed to more quickly reach and capture the prey agent. Experimental results are shown to illustrate the efficiency of the method in the pursuit problem.

Projection Pursuit Dynamic Cluster Model and its Application to Water Resources Carrying Capacity Evaluation

The research shows that projection pursuit cluster (PPC) model is able to form a suitable index for overcom-ing the difficulties in comprehensive evaluation, which can be used to analyze complex multivariate prob-lems. The PPC model is widely used in multifactor cluster and evaluation analysis, but there are a few prob-lems needed to be solved in practice, such as cutoff radius parameter calibration. In this study, a new model-projection pursuit dynamic cluster (PPDC) model-based on projection pursuit principle is developed and used in water resources carrying capacity evaluation in China for the first time. In the PPDC model, there are two improvements compared with the PPC model, 1) a new projection index is constructed based on dynamic cluster principle, which avoids the problem of parameter calibration in the PPC model success-fully;2) the cluster results can be outputted directly according to the PPDC model, but the cluster results can be got based on the scatter points of projected characteristic values or the re-analysis for projected character-istic values in the PPC model. The results show that the PPDC model is a very effective and powerful tool in multifactor data exploratory analysis. It is a new method for water resources carrying capacity evaluation. The PPDC model and its application to water resources carrying capacity evaluation are introduced in detail in this paper.

Research on the Signal Reconstruction of the Phased Array Structural Health Monitoring Based Using the Basis Pursuit Algorithm

The signal processing problem has become increasingly complex and demand high acquisition system,this paper proposes a new method to reconstruct the structure phased array structural health monitoring signal.The method is derived from the compressive sensing theory and the signal is reconstructed by using the basis pursuit algorithm to process the ultrasonic phased array signals.According to the principles of the compressive sensing and signal processing method,non-sparse ultrasonic signals are converted to sparse signals by using sparse transform.The sparse coefficients are obtained by sparse decomposition of the original signal,and then the observation matrix is constructed according to the corresponding sparse coefficients.Finally,the original signal is reconstructed by using basis pursuit algorithm,and error analysis is carried on.Experimental research analysis shows that the signal reconstruction method can reduce the signal complexity and required the space efficiently.

Autonomous Tracking Control for Four-Wheel Independent Steering Robot Based on Improved Pure Pursuit

Autonomous tracking control is one of the fundamental challenges in the field of robotic autonomous navigation,especially for future intelligent robots.In this paper,an improved pure pursuit control method is proposed for the path tracking control problem of a four-wheel independent steering robot.Based on the analysis of the four-wheel independent steering model,the kinematic model and the steering geometry model of the robot are established.Then the path tracking control is realized by considering the correlation between the look-ahead distance and the velocity,as well as the lateral error between the robot and the reference path.The experimental results demonstrate that the improved pure pursuit control method has the advantages of small steady-state error,fast response and strong robustness,which can effectively improve the accuracy of path tracking.

A NEW APPROACH FOR UNSUPERVISED RESTORING IMAGES BASED ON WAVELET-DOMAIN PROJECTION PURSUIT LEARNING NETWORK

The Wavelet-Domain Projection Pursuit Learning Network (WDPPLN) is proposedfor restoring degraded image. The new network combines the advantages of both projectionpursuit and wavelet shrinkage. Restoring image is very difficult when little is known about apriori knowledge for multisource degraded factors. WDPPLN successfully resolves this problemby separately processing wavelet coefficients and scale coefficients. Parameters in WDPPLN,which are used to simulate degraded factors, are estimated via WDPPLN training, using scalecoefficients. Also, WDPPLN uses soft-threshold of wavelet shrinkage technique to suppress noisein three high frequency subbands. The new method is compared with the traditional methodsand the Projection Pursuit Learning Network (PPLN) method. Experimental results demonstratethat it is an effective method for unsupervised restoring degraded image.

Capricious World, Constant Pursuit——Dato' Prof. Dr. Chin Yew Sin, Group Managing Director of Metronic Global Berhad

How can a man perform the role of a winner?He may be a scholar topping the study of a sub-ject,an engineer proficient in certain skills,an entrepreneur capable of creat-ing boundless wealth,a social worker working for the betterment of the so-

Chinese People’s Pursuit for Better Life Unstoppable

COME rain or shine, the eforts of Chinese people in pursuing a better life are unstoppable, according to a Chinese language commentary which was published under the byline “Xuanyan” in the People＇s Daily on August 8. The 4,700-character article, titled “Create a Better Life, Come Rain or Shine,” summarized China’s development and reform since 1949, as well as its attitudes towards the challenges facing the country.

Congratulatory Letter from President Akinobu Itoh of Japan-China Workers' Association for Exchanges

I’d like to start by wishing the Beijing Winter Olympic Games a complete success.Japan-China Workers’Association for Exchanges is an organisation engaged in promoting the friendly exchanges between Japan and China.In my view,the Beijing Winter Olympic Games should not be involved in such weird politics as political boycott or diplomatic boycott.I hope to see its opening and success as a grand sports event in pursuit of peace.

Learning From Up and Out of Poverty A minister and advisor to the Senegalese president contributes his enlightening comments on Chinese President Xi Jinping’s book

It is with great interest that I read the book Up and Out of Poverty,written by Chinese President Xi Jinping.The book was originally published in 2016,but remains highly topical today.Besides the struggle against poverty,which,in itself,is an essential issue of governance in modern times,President Xi addresses various other important issues in the book,including the relations and links between cadres and local people,pursuit of excellence in work,quality of state administration,industrial policies,education,cul tural construction,ethical rules in governance,etc.

Editorial

In pursuit of higher energy density,lower cost,longer lifespan and safety,remarkable research efforts have been taken to innovate various types of energy storage materials/devices,especially metal-ion batteries such as Li-ion batteries(LIBs).One of the major challenges is to elucidate the working mechanisms and/or the controlling factors of any new material in a full battery,which requires adequate characterization/diagnosis techniques.Among the numerous electrochemical ex-situ and insitu characterization techniques,magnetic resonance techniques,including nuclear magnetic resonance(NMR),magnetic resonance imaging(MRI)and electron paramagnetic resonance(EPR),are unique in terms of providing structural information at the atomic level and real-time phase and morphology evolution and characterizing ionic motion at various timescales.This special issue is dedicated to an editorial and a selection of papers on the theme of investigating energy storage materials/devices using magnetic resonance techniques.As the guest editors of this special issue,we are honored to introduce the following high-quality research articles and review articles.

China's key energy production base turns to hydrogen in pursuit of green development

The Ningdong Energy and Chemical Industry Base in northwest China's Ningxia Hui Autonomous Region,one of China's major energy production bases,is eyeing opportunities in hydrogen energy production.In contrast to grey hydrogen,which is produced from natural gas,green hydrogen,which is made from water and renewable power,has been considered a more climate-friendly energy solution.Producing green hydrogen is critical for the mega coal-to-chemical industry base to move towards modem.

The Pursuit of Happiness

Xinjiang has effectively safeguarded the basic rights of people of all ethnic groups to work and employment,and made great strides in economic and social development,thus significantly improving people’s livelihoods.

Capturing the Pictorial Beauty of the Great Wall

In the quest to capture the most impressive moments of the majestic Great Wall,post-90s generation photographer Yang Dong found his lifelong pursuit.FOR photographers,serendipity is the essential catalyst for seizing a decisive moment.Yang Dong first experienced his in 2016,while taking a rest at the Jinshanling section of the Great Wall in north China’s Hebei Province.

一种基于Matching pursuits时频分解算法的语音降噪方法

提出一种基于时频分解算法的语音降噪方法,利用Matchingpursuits时频分解算法对含噪语音信号进行分解,把分解后的各个分量的魏格纳分布之和作为整个信号的魏格纳分布,这样便使得信号和噪声在时频平面上有了较直观的分布,利用这个特点对信号进行降噪。仿真结果表明,该方法能在保证可听懂度的情况下,有效地去除含噪语音信号中的宽带噪声。

抗广谱除草剂pursuit水稻的抗性遗传分析和利用

以4个恢复系测64、明恢63、特青和02428为母本,分别与抗除草剂pursuit(普杀特)水稻品种PT2杂交,遗传分析表明,PT2的抗性遗传符合一对显性核基因的模式。通过杂交一代和回交二代已将抗性基因转移到恢复系,初步培育出4个抗性恢复系测64-P、明恢63-P、特青-P和02428-P;它们与不育系杂交,选育到4个杂交稻组合。考种结果发现,抗除草剂组合基本上能保持原组合的产量水平,苗期喷药可完全淘汰假杂种。利用这项技术可望解决三系、两系或化学杀雄杂交稻制种过程中出现的纯度问题,且有利于新杂交稻组合的选育。对该项技术在生产上的应用前景和存在问题进行探讨。

Compete Matching Pursuits Algorithm

Matching pursuits algorithm (MP), as an adaptive signal representation upon overcomplete fundamental waveforms, is a powerful tool in many applications. However, MP suffers from distinguishing a doublet structure. In this paper, the authors proposed an algorithm called compete matching pursuits (CMP), which can overcome this shortcoming and performance very well.

Single-trial evoked brain responses modeled by multichannel matching pursuit

A multichannel matching pursuit（MMP）algorithm is proposed to decompose the one-dimensional multichannel non-stationary magnetoencephalography（MEG）signal at a single-trial level.The single-channel matching pursuit（MP）linearly decomposes the signal into a set of Gabor atoms,which are adaptively chosen from an overcomplete dictionary with good time-frequency characters.The MMP is the extension of the MP,which represents multichannel signals using linear combination of Gabor atoms with the same occurrence,frequency,phase,and time width,but varying amplitude in all channels.The results demonstrate that the MMP can optimally reconstruct the original signal and automatically remove artifact noises.Moreover,the coherence between the 3D source reconstruction and the prior knowledge of psychology further suggests that the MMP is effective in MEG single-trial processing.

Matching Pursuits视频编码中原子匹配块搜索中的权值设计

基于 Matching Pursuits的误差图像编码算法因其基函数的灵活性 ,是一种在低码率视频编码应用中较为理想的算法 ,块能量搜索算法被用于减少该算法的编码复杂度 .针对固定权值加权块搜索算法的不足之处 ,提出了一种自适应加权块搜索算法 ,在不增加算法复杂度的情况下 ,对不同的被编码序列采用不同的权值表完成加权块能量算法 ;在各种情况下均得到了较理想的编码效果 .

Pure Pursuit算法在移动机器人路径跟踪的位姿修正研究

文章介绍了Pure Pursuit算法在移动机器人路径跟踪方面的原理。着重探讨了采用Pure Pursuit算法对移动机器人路径跟踪的位置和姿态调整问题,提出了保证移动机器人在路径的关键点处的位置和姿态都能同时满足要求的算法。通过仿真程序对算法的正确性进行了验证。文章可以为采用Pure Pursuit算法进行路径跟踪的移动机器人提供参考。