APPLICATION SIMILARITY

An application (app) store system may include functionality to determine whether an application is similar to other applications in the store. The application store system may determine similarity based on a number of aspects, such as title, description, icon, and application programming code

COMPARATIVE STUDY OF ON-SITE SORTING FOR C&D IN CHINA AND EUROPE

Construction and demolition waste (CDW) accounts for 40% of urban municipal waste in China and around 25% in the European Union (EU). Since the EU is more developed and urbanized than China, its experience with managing CDW may be helpful to China. This study therefore compared China and the EU with respect to the flow of CDW materials and the policies, laws and regulations for CDW management. The results reveal that the CDW management practices and facilities in China are relatively underdeveloped with a large amount of low-value inert material going to landfill compared with the EU. The study also reveals the important role of government involvement in CDW management, including the use of punitive measures and preferential policies; most EU members states achieved their waste recovery rates by 2016 due to mature CDW legalization. To improve the management of CDW in China, a series of suggestions are proposed including waste prevention strategies, establishment of supervision mechanisms, and financial support. </jats:p

Multi-Level Variational Spectroscopy using a Programmable Quantum Simulator

Energy spectroscopy is a powerful tool with diverse applications across various disciplines. The advent of programmable digital quantum simulators opens new possibilities for conducting spectroscopy on various models using a single device. Variational quantum-classical algorithms have emerged as a promising approach for achieving such tasks on near-term quantum simulators, despite facing significant quantum and classical resource overheads. Here, we experimentally demonstrate multi-level variational spectroscopy for fundamental many-body Hamiltonians using a superconducting programmable digital quantum simulator. By exploiting symmetries, we effectively reduce circuit depth and optimization parameters allowing us to go beyond the ground state. Combined with the subspace search method, we achieve full spectroscopy for a 4-qubit Heisenberg spin chain, yielding an average deviation of 0.13 between experimental and theoretical energies, assuming unity coupling strength. Our method, when extended to 8-qubit Heisenberg and transverse-field Ising Hamiltonians, successfully determines the three lowest energy levels. In achieving the above, we introduce a circuit-agnostic waveform compilation method that enhances the robustness of our simulator against signal crosstalk. Our study highlights symmetry-assisted resource efficiency in variational quantum algorithms and lays the foundation for practical spectroscopy on near-term quantum simulators, with potential applications in quantum chemistry and condensed matter physics

A high speed direct digital frequency synthesizer realized by a segmented nonlinear DAC

This paper presents a high speed ROM-less direct digital frequency synthesizer (DDFS) which has a phase resolution of 32 bits and a magnitude resolution of 10 bits. A 10-bit nonlinear segmented DAC is used in place of the ROM look-up table for phase-to-sine amplitude conversion and the linear DAC in a conventional DDFS.The design procedure for implementing the nonlinear DAC is presented. To ensure high speed, current mode logic (CML) is used. The chip is implemented in Chartered 0.35μm COMS technology with active area of 2.0 × 2.5 mm~2 and total power consumption of 400 mW at a single 3.3 V supply voltage. The maximum operating frequency is 850 MHz at room temperature and 1.0 GHz at 0 ℃

A Compact Direct Digital Frequency Synthesizer for the Rubidium Atomic Frequency Standard

A compact direct digital frequency synthesizer （DDFS） for system-on-chip implementation of the high precision rubidium atomic frequency standard is developed. For small chip size and low power consumption, the phase to sine mapping data is compressed using sine symmetry technique, sine-phase difference technique, quad line approximation technique,and quantization and error read only memory （QE-ROM） technique. The ROM size is reduced by 98% using these techniques. A compact DDFS chip with 32bit phase storage depth and a 10bit on-chip digital to analog converter has been successfully implemented using a standard 0.35μm CMOS process. The core area of the DDFS is 1.6mm^2. It consumes 167mW at 3.3V,and its spurious free dynamic range is 61dB

Unusual ultra-hydrophilic, porous carbon cuboids for atmospheric-water capture

There is significant interest in high-performance materials that can directly and efficiently capture water vapor, particularly from air. Herein, we report a class of novel porous carbon cuboids with unusual ultra-hydrophilic properties, over which the synergistic effects between surface heterogeneity and micropore architecture is maximized, leading to the best atmospheric water-capture performance among porous carbons to date, with a water capacity of up to 9.82 mmol g−1 at P/P0=0.2 and 25 °C (20 % relative humidity or 6000 ppm). Benefiting from properties, such as defined morphology, narrow pore size distribution, and high heterogeneity, this series of functional carbons may serve as model materials for fundamental research on carbon chemistry and the advance of new types of materials for water-vapor capture as well as other applications requiring combined highly hydrophilic surface chemistry, developed hierarchical porosity, and excellent stability

Tuning a compatible interface with LLZTO integrated on cathode material for improving NCM811/LLZTO solid-state battery

© 2020 Elsevier B.V. Poor interfacial contact and severe polarization of nickel-rich cathode materials are crucial problems that must be solved in the development of nickel-rich cathode/garnet-type electrolyte solid-state batteries. Herein, a binder-like Li3PO4 is introduced via an in-situ calcination process to build a compatible and Li+-conductive self-integrated layer of Li6.4La3Zr1.4Ta0.6O12-Li3PO4 on LiNi0.8Co0.1Mn0.1O2 cathode material, with a newly calculation method for estimating the interface compatibility theoretically. In addition, the routine helps weaken the space charge layer of active material commonly inevitable in the case, as demonstrated by calculation of Density Functional Theory and Atomic force microscopy analysis. With the interface engineering, the in-situ generated Li3PO4 tightly fix Li6.4La3Zr1.4Ta0.6O12 on LiNi0.8Co0.1Mn0.1O2, improving the compatibility between LiNi0.8Co0.1Mn0.1O2 cathode material and the solid electrolyte Li6.4La3Zr1.4Ta0.6O12. As a result, the interface-engineered LiNi0.8Co0.1Mn0.1O2/Li6.4La3Zr1.4Ta0.6O12 solid state battery exhibits an initial discharge capacity of 188.8 mAh g−1 at 0.2C (40 mA g−1). Even at 1C, its retention still remained 91.6% (initial value of 130 mAh g−1) after 100 cycles. The SSBs could also work well under high temperature, delivering high initial discharge capacities of 153.4 mAh g−1 (55 °C) and 149.6 mAh g−1 (80 °C) at 1C, respectively. The work provides an effective strategy to improve NCM811-LP-LLZTO SSBs.11Nsciescopu

Stretchable and Semitransparent Conductive Hybrid Hydrogels for Flexible Supercapacitors

Conductive polymers showing stretchable and transparent properties have received extensive attention due to their enormous potential in flexible electronic devices. Here, we demonstrate a facile and smart strategy for the preparation of structurally stretchable, electrically conductive, and optically semitransparent polyaniline-containing hybrid hydrogel networks as electrode, which show high-performances in supercapacitor application. Remarkably, the stability can extend up to 35 000 cycles at a high current density of 8 A/g, because of the combined structural advantages in terms of flexible polymer chains, highly interconnected pores, and excellent contact between the host and guest functional polymer phase