Journal of Sport and Health Science Published Special Topics(2018—2019)

Fields of particular interest to JSHS include (but are not limited to):·Sport and exercise medicine·Injury prevention and clinical rehabilitation·Sport and exercise physiology·Public health promotion·Physical activity epidemiology·Biomechanics and motor

Two special topics on the avian influenza virus and on epigenetics,have drawn much attention

Several excellent well-organized reviews and research papers on two special topics, "The challenges of avian influenza virus: mechanism, epidemiology, and control" and "Molecular

Preface to Special Topic:Graphene and 2D Materials for Energy Storage

Graphene, a single layer of graphite, has been one of the first real two dimensional （2D） materials isolated in 2004. Thus, graphene is becoming a cutting edge material that opens up new horizons to a whole family of 2D materials beyond the limited current applicability of graphene. The unique advantages of graphene and analogue 2D materials, such as atomic-scale thickness, high specific surface area, mechanically flexible robustness, superior storage capacity, endow them as high-performance electrodes lbr electrochemical energy storage devices. Although it is hard to say whether or not graphene and 2D materials will be implemented in future energy technologies, the recent achievements in this field demonstrate that their roles will be noticeable in the near future.

Special Topic on Major Research Program: Catalysis Science for Carbon-based Energy Conversion

The major research program,"Catalysis science for carbon-based energy conversion",from the national science foundation of China(NSFC)answers to the main strategic needs of China for the efficien use of carbon-based energy and targets to address the key scientifi issues involved in the catalytic interfaces.The research program aims to improve the catalytic activation of C–H and C–O bonds and the C–C coupling process,

Unsupervised Feature Selection for Latent Dirichlet Allocation

As a generative model,Latent Dirichlet Allocation Model,which lacks optimization of topics' discrimination capability focuses on how to generate data,This paper aims to improve the discrimination capability through unsupervised feature selection.Theoretical analysis shows that the discrimination capability of a topic is limited by the discrimination capability of its representative words.The discrimination capability of a word is approximated by the Information Gain of the word for topics,which is used to distinguish between "general word" and "special word" in LDA topics.Therefore,we add a constraint to the LDA objective function to let the "general words" only happen in "general topics" other than "special topics".Then a heuristic algorithm is presented to get the solution.Experiments show that this method can not only improve the information gain of topics,but also make the topics easier to understand by human.

Preface to the Special Topic on Devices and Circuits for Wearable and IoT Systems

The concept of Internet of Things（IoT）was first proposed by MIT Prof.Kevin Ash-ton in 1999.The implementation of IoT was mainly through RFID in its early time.With advanced technology and manufacture,diverse implementation forms of IoT are becoming possible.Wearable devices,as an essential branch of IoT,will have broad application prospects in health monitoring and intelligent healthcare.

Special topic on electrochemical power sources

With the concurrent successes of lithium-ion batteries, supercapacitors and fuel cells during the last two decades, electrochemical devices that convert and store electric energy through chemical reactions have played a vital role in powering the modem industry. Driven by a raising demand from the emerging energy-dependent industries sueh as grid and electric automobiles, the pursuit of electrochemical power sources with higher energy density and efficiency, and better economic sustainability is always one of the most attractive topics in the field of chemistry for this century and beyond.

Special Topic:Biomedical Application of DNA-Assembled Nanostructure

Pathological features of diseases are typically accompanied with certain upregulated biomarkers,such as ions,nucleic acids,small molecules and proteins.Highly sensitive detecting tools with acceptable compatibility are of paramount importance for the precise diagnose of diseases.However,the sensitivity,accuracy and biosafety of probes still remain a challenge,which persuade researchers to explore more applicable materials and platforms to address these issues.

Preface to the Special Topic on Perovskite Solar Cells

Halide perovskite materials were discovered about one hundred years ago,but the application of this material in solar cells only can be traced back to 2009,when the first perovskite solar cells（PSCs）were demonstrated by Miyasaka et al.in a dye sensitized solar cell configuration showing 3.8%power conversion efficiency.

Special Topic on Mental Health and Addiction

We are delighted to have been invited to edit this Special Topic on Mental Health and Addiction. Mental disorders like drug addiction, mood disorders, and schizophrenia affect a sizeable proportion of the human population, severely compromise the quality of life, and constitute a large global burden of disease. The evolution of molecular, cellular, and neurophysiological studies of rodents and the technical advances in human imaging and assessment have gradually extended our understanding of the molecular and neural mechanisms underlying these disorders.

Special topic on aggregation-induced emission

Aggregation-induced emission（AIE）,conceptually termed in 2001 by our group at the Hong Kong University of Science＆Technology,refers to a unique phenomenon that a kind of nonemissive or weakly emissive molecules in their solution states become highly luminescent in their aggregate or solid states.

Forewords Special Topic Issue on Nanophotonics

This Special Topic Issue has grown out of research that has been highlighted at the Nanophotonics Conference series held in China for the past three years. The fourteen papers appearing in this issue are a small sampling of the total scope of the Conference. Broadly speaking, the subjects covered by the contributing authors include quantum properties using semiconductor materials, nanocharacterization especially with applications to medical fields, photonic crystals and fibers, and plasmonics.

Special topic on soft matter science and technology

Soft matter, as first proposed by de Gennes in 1991, describes a broad range of molecular systems exhibiting a large response to small foreign stimuli. Typically, it includes colloidal particles, amphiphiles, liquid crystals, polymers and others. The term ＂soft＂ originates from the common macroscopic properties of these systems and differentiates them from conventional ＂hard＂ materials. Over the past decades, the field of ＂soft matter＂ has progressed tremendously. Today, it is a truly multidisciplinary research endeavor bridging physics with chemistry and life science. There are many research activities all over the world that are solely devoted to the field of soft matter. In turn, the in-depth understanding of soft matter has promoted our sci- ence and technology and helped shaping our civilization as it is now.

Special topic on research frontier in polymer science in China

Polymer science is a multiple discipline that studies synthe- sis, structure, function and application of macromolecules. It encompasses subdisciplines of polymer chemistry, phys- ics and engineering. Despite the fact that polymeric materi- als had been known and used for quite long time,