This paper considers the construction of resilient Boolean functions on an odd number of variables with strictly almost optimal (SAO) nonlinearity. Through introducing the fragmentary Walsh ...transform, a construction technique called "High-Meets-Low" is proposed. The detailed design procedures of a 39-variable 3-resilient Boolean function with SAO nonlinearity <inline-formula> <tex-math notation="LaTeX">2^{38}-2^{19}+2^{16}+2^{14} </tex-math></inline-formula> are given. It is shown that the nonlinearity of an <inline-formula> <tex-math notation="LaTeX">n </tex-math></inline-formula>-variable <inline-formula> <tex-math notation="LaTeX">t </tex-math></inline-formula>-resilient Boolean function can reach <inline-formula> <tex-math notation="LaTeX">2^{n-1}-2^{(n-1)/2}+5\cdot 2^{(n-11)/2} </tex-math></inline-formula> or <inline-formula> <tex-math notation="LaTeX">2^{n-1}-2^{(n-1)/2}+2^{(n-7)/2} </tex-math></inline-formula>, which are the largest known values for the corresponding <inline-formula> <tex-math notation="LaTeX">n </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">t </tex-math></inline-formula> values. Finally, by constructing a 29-variable balanced Boolean function with SAO nonlinearity <inline-formula> <tex-math notation="LaTeX">2^{28}-2^{14}+2^{10}+2^{9} </tex-math></inline-formula>, we show an alternative method to realize the High-Meets-Low construction technique.
I employ autoethnography to undertake a broader scholarly inquiry on intergenerational relationships and transnational care shaped by global migration and aging. Specifically, I reflect on the ...dynamics of my relationship with my mother, beginning with my departure from my home and spanning a period of 40 years, 8 in China and 34 outside China. In doing so, I contemplate theoretical models of intergenerational solidarity, ambivalence, and role ambiguity. I also challenge cultural assumptions of filial piety. The geographical distance, passage of time, and acculturation process have profoundly influenced my perception of filial piety, which differs markedly from my mother’s. However, this divergence in consensual solidarity—marked by variations in attitudes, beliefs, and values—does not translate into weakened affectual solidarity, characterized by positive sentiments and emotions. Furthermore, aided by advancements in transportation and social media technology, I have been able to extend crucial emotional and some “instrumental” care to my mother, along with financial support if needed, despite limited hands-on care. Nevertheless, I must negotiate my care for my mother and navigate a delicate balance in coordinating my care efforts with those of my non-migrant siblings.
New inorganic nonlinear-optical (NLO) materials are necessary for solid-state lasers to generate coherent radiation in the ultraviolet (UV) and deep-UV regions. The purpose of this Viewpoint is to ...describe the chemical and physical requirements for such materials, as well as the current state of the field. In addition, the “birefringence challenge” is described and a flowchart is presented for characterizing new second-harmonic-generation materials. Finally, several new materials are suggested that may have UV and/or deep-UV NLO applications.
The outbreak of emerging severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) disease (COVID-19) in China has been brought to global attention and declared a pandemic by the World Health ...Organization (WHO) on March 11, 2020. Scientific advancements since the pandemic of severe acute respiratory syndrome (SARS) in 2002~2003 and Middle East respiratory syndrome (MERS) in 2012 have accelerated our understanding of the epidemiology and pathogenesis of SARS-CoV-2 and the development of therapeutics to treat viral infection. As no specific therapeutics and vaccines are available for disease control, the epidemic of COVID-19 is posing a great threat for global public health. To provide a comprehensive summary to public health authorities and potential readers worldwide, we detail the present understanding of COVID-19 and introduce the current state of development of measures in this review.
Due to the increasing progress of digital technology in recent years, the protection, inheritance, development, and utilization of historical and cultural resources have become more and more ...integrated into it, and it has become an ideal way. At present, many countries and regions have carried out relevant research projects. With the change of the living conditions of cultural heritage and the rapid development of sci & tech, many traditional protection methods are no longer suitable and need to be replaced by new protection methods. Digital protection technology is one of the fastest developing and most concerned. With the help of virtual reality (VR) technology, it presents the essence of Chinese culture for thousands of years and comprehensively combines the characteristics of all viewpoint with traditional Chinese culture. Select the representative Chinese traditional culture as the research direction, and analyze the cultural characteristics contained in the Chinese traditional culture. In this paper, Harris operator is used to extract the feature points of the images, and two registered images are calculated according to the affine transformation coefficient. The images after affine transformation are bilinear interpolated and weighted smoothed according to the adjacent position of the overlapping area to realize the seamless mosaic design of the images and the forward and backward projection algorithm of cylindrical panoramic images. And study the artistic expression of 3D panoramic image acquisition. Based on the analysis and experiment, it can be obtained that after calculation, the average spatial data acquisition efficiency can reach 61.8%. In practice, the average display effect can reach 60.4%.
Long non‐coding RNA (lncRNA) have been the focus of increasing attention due to the role they play in many diseases, including osteosarcoma. The function of taurine upregulated gene 1 (TUG1) and its ...mechanism in osteosarcoma remain unclear. In our research, we found that TUG1 was elevated and correlated with a poor prognosis in osteosarcoma patients. In addition, the following functional experiment showed that decreased TUG1 could remarkably inhibit osteosarcoma cell migration and invasion, indicating that TUG1 functioned as an oncogene in osteosarcoma. Moreover, we revealed that TUG1 and Rho‐associated coiled‐coil‐containing protein kinase 1 (ROCK1), a metastasis‐related gene targeted by microRNA‐335‐5p (miR‐335‐5p), had the same miR‐335‐5p combining site. The subsequent luciferase assay verified TUG1 was a target of miR‐335‐5p. Furthermore, the results of a real‐time quantitative PCR showed that TUG1 and miR‐335‐5p could affect each other's expression. respectively. Finally, we affirmed that TUG1 affected ROCK1 expression and ROCK1‐mediated migration/invasion by working as a competitive endogenous RNA (ceRNA) via miR‐335‐5p. In summary, the findings of this study, based on ceRNA theory, combining the research foundation of miR‐335‐5p and ROCK1, and taking TUG1 as a new study point, provide new insight into molecular‐level reversing migration and invasion of osteosarcoma.
TUG1 was a target of miR‐335‐5p in osteosarcoma tissues and cell lines. TUG1 could increase ROCK1 expresion and promote ROCK1 mediated migration/invasion by working as a ceRNA of miR‐335‐5p.
Access to the elusive deep‐ultraviolet by direct second harmonic generation (SHG) enabled by a new beryllium‐free zincoborate‐phosphate crystal is reported. Ba3(ZnB5O10)PO4, exhibits large SHG ...responses at 1064 and 532 nm and a short 180 nm absorption edge. Centimeter‐size crystals are grown, and quantum mechanical calculations demonstrate the key role played by ZnO4 tetrahedra in the enhanced optical responses.
Because of the deterioration of aerodynamic performance of airfoils due to the dynamic stall of large wind turbine blades, a miniaturised remote-wireless-controlled actuating power supply and ...dielectric barrier discharge plasma actuator based on car-sticker technology were developed in this study. An experimental investigation of the plasma flow control of airfoil dynamic stall was carried out using dynamic pressure synchronous measurement and electronic external trigger Particle Image Velocimetry tracking acquisition. This study demonstrated that plasma aerodynamic actuation can effectively control the airfoil dynamic stall, reduce the strength of the dynamic separation vortex, improve the average aerodynamic force, increase the aerodynamic efficiency and reduce the hysteresis loop region when the aerodynamic force varies with the angle of attack, especially under both positive stroke and negative stroke. The average lift coefficient is increased by 7.1%, the stall angle of attack is delayed by 1.3°, and the hysteresis loop region is decreased by 4.5%; at the angle of attack of 4°–9°, the plasma actuator reduces the average drag coefficient of the airfoil by 44.5%. The flow mechanism was also revealed. The actuator induces vortexes close to the suction surface, shaping a “virtual bulge” and affecting the downstream flow; the flow momentum in the boundary layer is then increased and a low-pressure region is generated that promotes the dynamic separation flow reattaching to the airfoil surface. This report will provide a new strategy for applying plasma flow control technology to improve the efficiency of large wind turbine blades.
•Miniaturised wireless-controlled actuating power and car-sticker plasma actuator.•Synchronous measurement and electronic-external-trigger tracking acquisition.•Enhancement of aerodynamic lift and efficiency by plasma actuation.•Virtual bulge induced by plasma forms a low-pressure region on the suction surface.•New strategy to improve the energy capturing efficiency of wind turbine blades.
The Yangtze Delta (YD), as one of the world mega deltas, its formation process has long been the subject of research. Previous study has proposed a remote connection of the Yellow River (YR) to the ...building of the YD over the past 600–400 years. However, complex source‐sink routing system of the YD sediment and lack of diagnostic provenance tools have hampered further understanding of this process. Inferred from detrital zircon U‐Pb geochronology, this study revealed an increased and significant contribution of the reworked YR sediment to the YD (up to 26%) since ca. 500 a during the period YR shifted its lower courses and entered the southern Yellow Sea. This study not only highlights the impact of human activity on the formation of the world's large delta but also addresses the intricate interplay between neighboring deltas through marine dynamics, for example, alongshore and tidal currents.
Plain Language Summary
China's two mega rivers, the Yangtze River and Yellow River have carried tremendous amount of sediments from the Asian inland to the marginal seas. It was widely acknowledged that the Yangtze Delta mainly consists of the sediments derived from the Yangtze River. However, the Yangtze Delta has experienced rapid growth over the past 2000 years and some studies argued that the Yellow River exerts an influence on the building of the Yangtze Delta. Here we used zircon U‐Pb age as “DNA” for the sediment to identify the Yellow River's source signature in the Yangtze Delta and further quantitatively estimated the relative contribution of the Yellow River to the Yangtze Delta. We prove that zircon U‐Pb chronology is a powerful tool in distinguishing Yellow River and Yangtze River sediment and suggest it was the human‐induced southward shift of the Yellow River that provided an additional source for the Yangtze Delta over the past 500 years. Marine dynamics such as tides and alongshore currents were mainly responsible for sediment transport and deposition in the Yangtze Delta.
Key Points
Detrital Zircon U‐Pb chronology is an effective tool in distinguishing Yellow River and Yangtze River sourced sediments
Yellow River derived sediments contributed to the building of Yangtze Delta over the past 500 years as evidenced by zircon U‐Pb ages
Human induced Yellow River southward shift provided additional sediment to Yangtze Delta and alongshore current responsible for transport
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