A Multi‐Functional Highly Efficient Upconversion Luminescent Film with an Array of Dielectric Microbeads Decorated with Metal Nanoparticles

Upconversion nanoparticles (UCNPs) have been integrated with photonic platforms to overcome the intrinsically low quantum efficiency limit of upconversion luminescence (UCL). However, platforms based on thin films lack transferability and flexibility, which hinders their broader and more practical application. A plasmonic structure is developed that works as a multi‐functional platform for flexible, transparent, and washable near‐infrared (NIR)‐to‐visible UCL films with ultra‐strong UCL intensity. The platform consists of dielectric microbeads decorated with plasmonic metal nanoparticles on an insulator/metal substrate. Distinct improvements in NIR confinement, visible light extraction, and boosted plasmonic effects for upconversion are observed. With weak NIR excitation, the UCL intensity is higher by three orders of magnitude relative to the reference platform. When the microbeads are organized in a square lattice array, the functionality of the platform can be expanded to wearable and washable UCL films. The platform can be transferred to transparent, flexible, and foldable films and still emit strong UCL with a wide viewing angle.     

Achieving Amorphous Ultralong Room Temperature Phosphorescence by Coassembling Planar Small Organic Molecules with Polyvinyl Alcohol

Development of novel strategies for achieving amorphous ultralong organic phosphorescence (UOP) at room temperature is highly desired. Herein, a simple approach is reported by coassembling small organic molecules with polyvinyl alcohol (PVA) to afford amorphous UOP. These small organic molecules with planar conformation present quenched triplet state emission in an excessive stacking solid state. When coassembling these molecules with PVA, their planar structures are well confined in coassembly films. Such a confined environment leads to restricted molecular rotation and vibration, permitting these molecules to show stable triplet state and generate UOP. In control studies, corresponding structurally distorted molecules are also coassembled with PVA. However, they exhibit very weak or quenched UOP, since distorted structures with molecular rotation and vibration could easily dissipate the excitation energy in dilute film state. By employing this polymer confinement strategy, multicomponent luminescence dyes are further coassembled with PVA for multicolor luminescence displays, providing multicolor, uniform, and flexible luminescence films. This work demonstrates a general strategy of employing small organic molecules to coassemble with PVA to obtain amorphous UOP, which greatly expands the scope of organic molecules for developing simple but useful UOP films.     

Circularly Polarized Luminescence Induced by Chiral Super Nanospaces

A simple methodology is developed to realize chiroptical function induced through superstructural chirality of a matrix of helical nanofilaments formed by achiral molecules. In this work, circularly polarized luminescence is demonstrated in nanosegregated mesophase comprising only achiral molecules. An achiral molecular mixture of a bent‐core host and a rod‐like guest blended with a fluorescent dye is prepared. Circularly polarized luminescence confirms that the chiral superstructure consisting only of achiral molecules may serve as a chiral super nanospace for inducing chiral emissions from the fluorescent dye that exhibits rod‐like molecular ordering. In other words, the formation of a chiral superstructure by the segregated rod‐like molecules embedded in helical nanofilaments (bent‐core molecules) is confirmed. The results provide a novel strategy for constructing dissymmetric circularly polarized luminescence materials based on achiral molecules, which is potentially applicable in future information and display technologies.     

The design and implementation of an operating system to supportdistributed multimedia applications

Support for multimedia applications by general purpose computing platforms has been the subject of considerable research. Much of this work is based on an evolutionary strategy in which small changes to existing systems are made. The approach adopted is to start ab initio with no backward compatibility constraints. This leads to a novel structure for an operating system. The structure aims to decouple applications from one another and to provide multiplexing of all resources, not just the CPU, at a low level. The motivation for this structure, a design based on the structure, and its implementation on a number of hardware platforms is described     

A Double‐Layer Mechanochromic Hydrogel with Multidirectional Force Sensing and Encryption Capability

Hydrogel‐based soft mechanochromic materials that display colorimetric changes upon mechanical stimuli have attracted wide interest in sensors and display device applications. A common strategy to produce mechanochromic hydrogels is through photonic structures, in which mechanochromism is obtained by strain‐dependent diffraction of light. Here, a distinct concept and simple fabrication strategy is presented to produce luminescent mechanochromic hydrogels based on a double‐layer design. The two layers contain different luminescent species—carbon dots and lanthanide ions—with overlapped excitation spectra and distinct emission spectra. The mechanochromism is rendered by strain‐dependent transmittance of the top‐layer, which regulates light emission from the bottom‐layer to control the overall hydrogel luminescence. An analytical model is developed to predict the initial luminescence color and color changes as a function of uniaxial strain. Finally, this study demonstrates proof‐of‐concept applications of the mechanochromic hydrogel for pressure and contact force sensors as well as for encryption devices.     

Multistimuli‐Responsive Display Materials to Encrypt Differentiated Information in Bright and Dark Fields

Visually readable codes play a crucial role in anticounterfeiting measures. However, current coding approaches do not enable time‐dependent codes to be visually read, adjusted, and differentiated in bright and dark fields. Here, using a combined strategy of piezoelectric lattice selection, oxygen vacancy engineering, and activator doping, a lanthanide ion‐doped titanate is developed that integrates mechano‐, thermo‐, and photo‐responsive color change (>18 h for bright field), persistent luminescence (>6 h for dark field), and stimulus‐triggered multimodal luminescence. The feasibility of optical encoding, visual displaying, and stimulus‐responsive encrypting of time‐dependent, dual‐field information by using the developed material is demonstrated. In particular, the differentiated display of dual‐field modes is achieved by combining mechanostimulated abolition of only the persistent luminescence and thermo‐ and photostimulated reversal of both the color change and persistent luminescence. The results provide new insights for designing advanced materials and encryption technologies for photonic displays, information security, and intelligent anticounterfeiting.     

面向高动态高空平台网络的路由协议研究

提出了一种面向高动态高空平台网络的路由协议,该协议通过按需查找方式确定高动态用户所属的高空平台,根据最短延时路由表在高空平台之间转发数据,并通过用户切换策略保证数据传输的连续性。仿真结果表明,该协议能够适应用户高速移动和频繁切换的高动态环境,具有可靠性高、延时小、路由开销小、抗毁性强等特点,为高动态高空平台网络的数据转发提供了一种可行的解决方法。     

An Integrated Luminescent Information Encryption–Decryption and Anticounterfeiting Chip Based on Laser Induced Graphene

Visual optical information encryption–decryption and anti-counterfeiting (IEDAC) technology play a vital role in the field of information security. Recent luminescent information encryption technologies face the disadvantages of depending on external large-scale stimulus decryption equipment, inability to read out repeatedly, and information leakage, impeding the practical applications of luminescence encryption. Here, an integrated luminescent IEDAC chip is proposed, which provides a convenient approach to store and decipher pre-patterned luminescence information based on laser engraved template and film heater. The luminescent encryption chip contains a double-layer structure made up of long persistent phosphors based on SrCaGa₄O₈ host and a laser induced graphene heater, which makes it possible to decrypt information on a single chip. This design enables dual-mode (photoluminescence/long persistent luminescence), dual-color (blue/yellow-green), and multi-level IEDAC function, providing a novel insight and integrated strategy for implementing advanced IEDAC technologies.     

Access to premium content on mobile television platforms: The case of mobile sports

As broadcasting sports content has proved to be a popular strategy for driving the growth of the digital premium content marketplace in the past, mobile service operators aim to enter the sports rights market. However, as the markets for live sports broadcasting are still dominated by established broadcasters, mobile network operators are facing significant barriers to access premium content creating bottlenecks in the construction of business models. Therefore, content regulation is seen as essential for the development of mobile television platforms. This article aims to stress the strategic importance of content in the development of sustainable business models for mobile broadcasting services and will discuss the implications of bundling strategies and regulations for the viability of these emerging platforms.     

Persistent Luminescence Immune Hydrogel for Photodynamic-Immunotherapy of Tumors In Vivo

Persistent luminescence material (PLM)-based photodynamic therapy (PDT) has shown tremendous promise in tumor elimination via avoiding continuous external light illumination. In addition, the tumor-associated antigens produced by PDT can trigger systemic antitumor immune responses, but only exhibit a limited immunotherapy effect. Herein, a persistent luminescence immune hydrogel is developed via a “turning solid into gel” strategy by introducing a PLM and an immunoadjuvant (R837) into an alginate-Ca²⁺ hydrogel for rechargeable photodynamic-immunotherapy of tumors, for the first time. The designed PLM-R837-ALG hydrogel exhibits the intact persistent luminescence of the PLM, 100% of utilization efficiency of the hydrophobic precursors, good biocompatibility and syringeability, and can be easily injected into tumors to serve as an internal light source for efficiently activating photosensitizers to induce a sustained PDT effect. Moreover, the loaded R837 can significantly amplify the immunogenicity of tumor-associated antigens originating from PL sensitized PDT, thereby leading to a powerful immune response to suppress tumors in vivo. The proposed PL-based photodynamic-immunotherapy provides a novel combined tumor treatment paradigm.     

数字化转型中不同企业的中台战略及架构设计

国家经济转型和技术的高速发展,对企业提出数字化转型需求,如何通过IT架构升级来加速转型成为各个企业研究的新课题。阐述了中台的定义、作用和常见的类型,并对比分析了不同业务链长度的典型企业的中台战略和架构,提出了生产和运营解耦的中台规划理念。结合运营商现状,针对运营商建设中台的方法和类型提出了建议。     

Achieving Efficient Phosphorescence and Mechanoluminescence in Organic Host–Guest System by Energy Transfer

Host–guest doping strategy greatly facilitates and expands the scope of construction of organic phosphorescence materials. Herein, triphenylamine with excellent crystallinity is chosen as the host, and four guests with 2–4 triphenylamine repeating units are chosen as the guests. The similarity in molecular structures of the host and guests simplifies the exploration of the luminescence mechanism in the doped system. The doped materials display strong room temperature phosphorescence (RTP) with above 200 ms lifetimes and 30% quantum yields. In addition, the doped system emits blue fluorescence under mechanical stimulation, that is, shows a phenomenon of mechanoluminescence (ML). The experimental results prove that the host plays different roles in different luminescence processes. In the photophosphorescence process, the triplet energy level of the host assists the guest excitons to undergo intersystem crossing. Meanwhile, in the ML process, the energy generated as a result of piezoelectric property of the host crystal is transferred to the guest, causing the guest molecules to emit fluorescence. This work is significant for the construction of doped materials with multiple luminescence properties, including RTP and ML.     

Reconfiguration of a parallel kinematic manipulator with 2T2R motions for avoiding singularities through minimizing actuator forces

This paper aims to develop an approach for the reconfiguration of a parallel kinematic manipulator (PKM) with four degrees of freedom (DoF) designed to tackle tasks of diagnosis and rehabilitation in an injured knee. The original layout of the 4-DoF manipulator presents Type-II singular configurations within its workspace. Thus, we proposed to reconfigure the manipulator for avoiding such singularities (owing to the Forward Jacobian of the PKM) during typical rehabilitation trajectories. We achieve the reconfiguration of the PKM through a minimization problem where the design variables correspond to the anchoring points of the robot limbs on fixed and mobile platforms. The objective function relies on the minimization of the forces exert by the actuators for a specific trajectory. The minimization problem considers constraints equations to avoid Type-II singularities, which guarantee the feasibility of the active generalized coordinates for a particular path. To evaluate the proposed conceptual strategy, we build a prototype where reconfiguration occurs by moving the position of the anchoring points to holes bored in the fixed and mobile platforms. Simulations and experiments of several study cases enable testing the strategy performance. The results show that the reconfiguration strategy allows obtaining trajectories having minimum actuation forces without Type-II singularities.     

Solid‐State Light Emission Controlled by Tuning the Hierarchical Superstructure of Self‐Assembled Luminogens

Solid‐state luminescence is an important strategy for color generation via molecular self‐assembly. Here, a new luminogen (AT₃EMIS) containing both a rigid chromophore and a flexible dendron is designed and synthesized for multicolor emission. The emission energy of the target material is precisely controlled by adjusting three different columnar arrays through thermal and mechanical stimulation. With well‐defined supramolecular organizations in different length scales, the luminescent properties of the light switch can be tuned.     

Controlled Synthesis of Multicolor Carbon Dots Assisted by Machine Learning

Carbon dots (CDs) have received extensive attention and applications in recent years due to their remarkable characteristics of tunable emission wavelength, high stability, and a variety of synthetic raw materials. Since the formation process and photoluminescence properties of CDs are affected by multiple factors, the luminescence regulation of CDs has always been a troublesome problem. Furthermore, it is still a lack of appropriate approaches to reveal the hidden rules between the synthesis conditions and the luminescence properties of CDs. Inspired by machine learning (ML) applications in molecular and materials science, herein, a data-driven ML strategy is proposed to multi-dimensionally investigate the correlation between reaction parameters and the photoluminescence properties of CDs. Meanwhile, it is demonstrated that reaction parameters and solvent properties have different influences on the fluorescence properties of CDs, and the intelligently optimizing synthesis route of CDs is achieved using ML algorithms. CDs with excellent luminescent properties screened by ML are further applied to high-capacity colorful information encryption. This study provides an efficient ML-assisted strategy to guide the synthesis of multicolor CDs, helping researchers to quickly and easily obtain CDs according to experimental requirements.     

Organic–Inorganic Hierarchical Self‐Assembly into Robust Luminescent Supramolecular Hydrogel

Luminescent hydrogels are of great potential for many fields, particularly serving as biomaterials ranging from fluorescent sensors to bioimaging agents. Here, robust luminescent hydrogels are reported using lanthanide complexes as emitting sources via a hierarchical organic–inorganic self‐assembling strategy. A new organic ligand is synthesized, consisting of a terpyridine unit and two flexibly linked methylimidazole moieties to coordinate with europium(III) (Eu³⁺) tri‐thenoyltrifluoroacetone (Eu(TTA)₃), leading to a stable amphiphilic Eu³⁺‐containing monomer. Synergistic coordination of TTA and terpyridine units allows the monomer to self‐assemble into spherical micelles in water, thus maintaining the luminescence of Ln complexes in water. The micelles further coassemble with exfoliated Laponite nanosheets coated with sodium polyacrylate into networks based on the electrostatic interactions, resulting in the supramolecular hydrogel possessing strong luminescence, extraordinary mechanical property, as well as self‐healing ability. The results demonstrate that hierarchical organic–inorganic self‐assembly is a versatile and effective strategy to create luminescent hydrogels containing lanthanide complexes, giving rise to great potential applications as a soft material.     

业务云平台容灾策略探讨

云资源池集中承载业务平台实现了资源共享,降低了投资,节省了维护成本,推进了平台的集约化维护,但同时也带来了新的安全隐患,所有风险都将集中在云资源池,一旦云资源池出现问题,将严重影响其所承载的所有业务平台的安全。基于此,通过结合云计算技术特征及业务平台容灾的实际需求,从资源池的硬件层、虚拟化层、业务平台层等多个维度探讨了业务云平台的整体容灾策略。     

Low‐Dose X‐ray Activation of W(VI)‐Doped Persistent Luminescence Nanoparticles for Deep‐Tissue Photodynamic Therapy

Although photodynamic therapy (PDT) has served as an important strategy for treatment of various diseases, it still experiences many challenges, such as shallow penetration of light, high‐dose light irradiation, and low therapy efficiency in deep tissue. Here, a low‐dose X‐ray‐activated persistent luminescence nanoparticle (PLNP)‐mediated PDT nanoplatform for depth‐independent and repeatable cancer treatment has been reported. In order to improve therapeutic efficiency, this study first synthesizes W(VI)‐doped ZnGa₂O₄:Cr PLNPs with stronger persistent luminescence intensity and longer persistent luminescence time than traditional ZnGa₂O₄:Cr PLNPs. The proposed PLNPs can serve as a persistent excitation light source for PDT, even after X‐ray irradiation has been removed. Both in vitro and in vivo experiments demonstrate that low‐dose (0.18 Gy) X‐ray irradiation is sufficient to activate the PDT nanoplatform and causes significant inhibitory effect on tumor progression. Therefore, such PDT nanoplatform will provide a promising depth‐independent treatment mode for clinical cancer therapy in the future.     

Calibration strategy for the Earth Observing System (EOS)-AM1platform

The Earth Observing System (EOS) is an international, 18-year program in global remote sensing of the Earth comprising multiple instruments flown on several satellite platforms. The first EOS platform, AM1, scheduled for launch in 1998, includes five instruments designed to make radiometric and reflectance measurements of the Earth over a wavelength range extending from the visible to the thermal infrared. The goal of the EOS-AM1 platform and instruments is to advance the scientific understanding of the Earth in the areas of clouds, aerosols, radiative balance, terrestrial and oceanic characterization, and the carbon cycle. In order to achieve this goal, the EOS-AM1 instruments must produce state-of-the-art accurate, precise, and consistent radiance and reflectance measurements over their five-year lifetimes. In addition, the production of continuous remote-sensing data from multiple instruments on several platforms requires that the remote-sensing measurements of the AM1 platform be radiometrically tied to the measurements made by instruments on successive platforms. This is achieved through careful prelaunch and postlaunch instrument calibration, cross-calibration, and level 1B data validation (i.e. vicarious calibration). This paper presents an overview of the calibration, cross-calibration, and level 1B data validation strategy for the AM1 platform     

Enhancing the Stability of Perovskite Quantum Dots by Encapsulation in Crosslinked Polystyrene Beads via a Swelling–Shrinking Strategy toward Superior Water Resistance

Organic/inorganic hybrid lead halide perovskites are promising optoelectronic materials due to their unique structure, excellent properties, and fascinating potential applications in lighting, photovoltaic, etc. However, perovskite materials are very sensitive to moisture and polar solvent, which greatly hinders their practical applications. Here, highly luminescent perovskite–polystyrene composite beads with uniform morphology are prepared via a simple swelling–shrinking strategy. This process is carried out only in nonpolar toluene and hexane without the addition of any polar reagents. As a result, the as‐prepared composite beads not only retain high luminescence but also exhibit superior water‐resistant property. The composites emit strong luminescence after being immersed into water over nine months. Moreover, even in some harsh environments such as acid/alkali aqueous solution, phosphate buffer solution, and Dulbecco's modified eagle medium biological buffers, they still preserve high luminescence. The applications in light‐emitting diodes and cellular labeling agents are also carried out to demonstrate their ultrastability.