金属木材混搭的新中式休闲座椅

由于社会的发展和需求的变化,中国传统家具暴露出一些不符合现代社会实际需求的问题。文章通过分析传统家具雕刻的复杂性和使用的人机问题,以金属和木材为材料,设计了一款具有现代感和舒适感的新中式休闲座椅,使其符合现代人的新需求。     

三元场对金属组织影响的研究

实验证明，在元极三元场中浇铸出的铸钢缺陷较少，力学性能较好，尤其是塑性与韧性可以大幅度提高。     

A portable lab-on-a-chip system for gold-nanoparticle-based colorimetric detection of metal ions in water

Heavy metal ions released into various water systems have a severe impact on the environment and human beings, and excess exposure to toxic metal ions through drinking water poses high risks to human health and causes life-threatening diseases. Thus, there is high demand for the development of a rapid, low-cost, and sensitive method for detection of metal ions in water. We present a portable analytical system for colorimetric detection of lead (Pb²⁺) and aluminum (Al³⁺) ions in water based on gold nanoparticle probes and lab-on-a-chip instrumentation. The colorimetric detection of metal ions is conducted via single-step assays with low limits of detection (LODs) and high selectivity. We design a custom-made microwell plate and a handheld colorimetric reader for implementing the assays and quantifying the signal readout. The calibration experiments demonstrate that this portable system provides LODs of 30 ppb for Pb²⁺ and 89 ppb for Al³⁺, both comparable to bench-top analytical spectrometers. It promises an effective platform for metal ion analysis in a more economical and convenient way, which is particularly useful for water quality monitoring in field and resource-poor settings.     

技术进步对关键金属矿产需求影响的研究综述

新技术、新材料、新产业的蓬勃发展将对关键金属矿产需求产生深远影响,探讨技术进步如何影响关键金属矿产需求,从而确保关键金属矿产安全,对中国经济迈上高质量发展阶段和实现低碳转型具有一定现实意义。本文对技术进步与关键金属需求关系的文献展开了系统梳理,发现：随着资源安全成为国家重要需求问题,技术进步与关键金属需求预测研究逐渐成为热点,但现有文献量化研究较少且缺乏系统性,鉴于技术进步测度和数据获取等难点,需求预测结果的精准性有待进一步提高。本文提炼了技术进步作用于关键金属需求的3条微观影响机制,即技术进步—经济增长—关键金属、技术进步—产业结构—关键金属、技术进步—替代循环—关键金属,为后续研究提供整体分析框架;提出该领域后续研究重点,即重点关注低碳技术-关键金属、战略新兴产业-关键金属耦合问题,同时解决技术进步在理论模型和计量模型中的测度问题,推进新技术革命背景下关键金属需求预测分析框架的构建。