The development and utilization of low-grade polymetallic deposits with strategic mineral resources is one of the important measures to alleviate the current high dependence on strategic mineral resources in China. Ho...The development and utilization of low-grade polymetallic deposits with strategic mineral resources is one of the important measures to alleviate the current high dependence on strategic mineral resources in China. However, domestic mining enterprises and most mining consulting and design institutes usually use general industrial indicators to carry out reserve estimation and technical and economic feasibility studies on low-grade polymetallic deposits, which cannot truly reflect the economic value of such deposits. The article expounds on the definitions of net return value (NSR) and on-site total maintenance cost (AISC) of common ore smelters in the evaluation of overseas mineral resources. Taking a low-grade polymetallic copper-molybdenum mine in Guangdong Province as an example, comparing the research results showed the NSR-AISC method and the general industrial index method in low-grade polymetallic deposit. There are huge differences in the results of reserve estimation;through the further introduction of Taylor’s formula and the research results on the relationship between investment intensity and production scale, a more reasonable mine life and investment scale are recommended, and a more in-depth comparative study has been carried out in the dimension of technical and economic indicators. Based on the comparative study of the above two methods in reserve estimation and the evaluation results of technical and economic indicators, the author believes that the NSR-AISC method can better reflect the true value of low-grade polymetallic ore projects, and should be popularized and applied in resource evaluation and development practice. This article further describes the application status of the NSR-AISC method for reserve estimation and the evaluation of technical economic indicators, and suggests the main points that should be paid attention to in the use of the NSR-AISC method.展开更多
近日,美国国家安全局(NSA)人工智能安全中心(AISC)联合美国网络安全和基础设施安全局(CISA)、澳大利亚信号局网络安全中心(ASD’s ACSC)、新西兰国家网络安全中心(NCSC-NZ)及英国国家网络安全中心(NCSC-UK)发布联合指南《AI数据安全:保...近日,美国国家安全局(NSA)人工智能安全中心(AISC)联合美国网络安全和基础设施安全局(CISA)、澳大利亚信号局网络安全中心(ASD’s ACSC)、新西兰国家网络安全中心(NCSC-NZ)及英国国家网络安全中心(NCSC-UK)发布联合指南《AI数据安全:保障用于训练和运行AI系统的数据的最佳实践》(Al Data Security:Best Practices for Securing Data Used to Train&Operate Al Systems)。展开更多
针对长线列红外时间延迟积分(TDI,Time Delay Intergration)探测系统面临通道多、噪声大、体积大、质量重、功耗大等问题,提出了利用专用集成电路(ASIC,Application Specific Integrated Circuit)方法解决长线列红外TDI探测读出电路中...针对长线列红外时间延迟积分(TDI,Time Delay Intergration)探测系统面临通道多、噪声大、体积大、质量重、功耗大等问题,提出了利用专用集成电路(ASIC,Application Specific Integrated Circuit)方法解决长线列红外TDI探测读出电路中面临的问题。通过实现由一款全定制ASIC芯片(8路红外信号调理芯片)和红外TDI探测器构建的红外探测扫描成像系统验证ASIC芯片可以解决长线列红外TDI探测系统中所面临的上述问题,整个系统噪声为1.42 m V,功耗为0.72 W。实现了读出电路的高集成化,减少设计复杂度和工作量,为微型化、小型化航天遥感卫星研发提供技术支持和实践基础。展开更多
通过对美国规范ASCE/SEI 7《Minimum Design Loads for Buildings and Other Structures》中抗震结构体系(SFRS)和地震设计动参数的取值、ACI 318《Building Code Requirements for Structural Concrete and Commentary》和ANSI/AISC 34...通过对美国规范ASCE/SEI 7《Minimum Design Loads for Buildings and Other Structures》中抗震结构体系(SFRS)和地震设计动参数的取值、ACI 318《Building Code Requirements for Structural Concrete and Commentary》和ANSI/AISC 341《Seismic Provisions for Structural Steel Buildings》对钢筋混凝土结构和钢结构抗震体系中抗震措施具体要求的分析,表明延性设计和"高延性-低弹性承载力"或"低延性-高弹性承载力"都是美国抗震设计的基本思路。设计选择何种抗震结构体系,关系着结构承受地震作用的大小、抗震措施的复杂难易以及工程造价。简述了ASCE/SEI 7结构体系地震动参数的取值,并与中国规范在地震作用、混合结构方面作简要对比。展开更多
文摘The development and utilization of low-grade polymetallic deposits with strategic mineral resources is one of the important measures to alleviate the current high dependence on strategic mineral resources in China. However, domestic mining enterprises and most mining consulting and design institutes usually use general industrial indicators to carry out reserve estimation and technical and economic feasibility studies on low-grade polymetallic deposits, which cannot truly reflect the economic value of such deposits. The article expounds on the definitions of net return value (NSR) and on-site total maintenance cost (AISC) of common ore smelters in the evaluation of overseas mineral resources. Taking a low-grade polymetallic copper-molybdenum mine in Guangdong Province as an example, comparing the research results showed the NSR-AISC method and the general industrial index method in low-grade polymetallic deposit. There are huge differences in the results of reserve estimation;through the further introduction of Taylor’s formula and the research results on the relationship between investment intensity and production scale, a more reasonable mine life and investment scale are recommended, and a more in-depth comparative study has been carried out in the dimension of technical and economic indicators. Based on the comparative study of the above two methods in reserve estimation and the evaluation results of technical and economic indicators, the author believes that the NSR-AISC method can better reflect the true value of low-grade polymetallic ore projects, and should be popularized and applied in resource evaluation and development practice. This article further describes the application status of the NSR-AISC method for reserve estimation and the evaluation of technical economic indicators, and suggests the main points that should be paid attention to in the use of the NSR-AISC method.
文摘近日,美国国家安全局(NSA)人工智能安全中心(AISC)联合美国网络安全和基础设施安全局(CISA)、澳大利亚信号局网络安全中心(ASD’s ACSC)、新西兰国家网络安全中心(NCSC-NZ)及英国国家网络安全中心(NCSC-UK)发布联合指南《AI数据安全:保障用于训练和运行AI系统的数据的最佳实践》(Al Data Security:Best Practices for Securing Data Used to Train&Operate Al Systems)。
文摘针对长线列红外时间延迟积分(TDI,Time Delay Intergration)探测系统面临通道多、噪声大、体积大、质量重、功耗大等问题,提出了利用专用集成电路(ASIC,Application Specific Integrated Circuit)方法解决长线列红外TDI探测读出电路中面临的问题。通过实现由一款全定制ASIC芯片(8路红外信号调理芯片)和红外TDI探测器构建的红外探测扫描成像系统验证ASIC芯片可以解决长线列红外TDI探测系统中所面临的上述问题,整个系统噪声为1.42 m V,功耗为0.72 W。实现了读出电路的高集成化,减少设计复杂度和工作量,为微型化、小型化航天遥感卫星研发提供技术支持和实践基础。
文摘通过对美国规范ASCE/SEI 7《Minimum Design Loads for Buildings and Other Structures》中抗震结构体系(SFRS)和地震设计动参数的取值、ACI 318《Building Code Requirements for Structural Concrete and Commentary》和ANSI/AISC 341《Seismic Provisions for Structural Steel Buildings》对钢筋混凝土结构和钢结构抗震体系中抗震措施具体要求的分析,表明延性设计和"高延性-低弹性承载力"或"低延性-高弹性承载力"都是美国抗震设计的基本思路。设计选择何种抗震结构体系,关系着结构承受地震作用的大小、抗震措施的复杂难易以及工程造价。简述了ASCE/SEI 7结构体系地震动参数的取值,并与中国规范在地震作用、混合结构方面作简要对比。
