Compared with the traditional light source, the semiconductor light source represented by white LED has the advantages of long life, small size and fast response. Considering the technical maturity and manufacturing cost comprehensively, the mainstream way of white LED packaging at present is that blue LED chips excite various phosphor materials [9]. With the rapid development of LED light source, various lighting applications put forward higher requirements for white LED. Conventional blue chip+yellow or green+red phosphor packaging scheme will lead to many problems such as too much blue light, insufficient green light and insufficient long-wave red light in the spectrum of white LED. In addition, the color rendering index is one of the key performance parameters of LED lighting, which is used to characterize the ability of light source to display the color of objects [10]. Ultra-high color rendering index generally refers to the color rendering index Ra >； of LED lamps; 95, and full-spectrum white LED lighting is based on this, and all special color rendering indexes r 1 ~ r 15 are required to be greater than 90[ 1 1]. From the perspective of white LED packaging, high-quality white LED light source should have high color rendering to present the true color of the object. Therefore, improving the luminous quality of existing white LEDs, especially the color rendering index [12], is an important task in the research and application of white LEDs.

Set out the center of the pile hole with total station, bury the mark, the deviation of the center of the pile group is not more than 100 mm, then bury the cross-shaped pile protection, and use the steel bar head to transfer the pile protection point to the concrete of the lock mouth during the construction of the lock mouth to ensure the stability of the pile point.

At present, the preparation of high color rendering index LED is mainly realized by exciting phosphor with blue LED chip. Common phosphors are aluminate yellow phosphor+red nitride powder, aluminate yellow phosphor+red nitride powder [13]. Blue-green phosphor of nitrogen oxide is a kind of LED phosphor developed in recent years, which overcomes the instability of blue-green silicate phosphor, and has long been used by LED packaging manufacturers to prepare ice-blue LED[ 14]. Special color rendering index (R 12) is an index to evaluate the reproduction quality of saturated blue light by LED, so R 12 should be kept at a high level while Ra is high, but it is relatively difficult to improve the value of R 12, so it is necessary to pay special attention to the value of R 12 when preparing full-spectrum white LED. The blue-green phosphor with the peak emission wavelength of about 495 nm can make up for the cyan component in the spectrum of white LED and improve R 12. The ultra-high index of 95 and above can be achieved by using yellow-green powder in conventional band and red powder in high band, and even the full spectrum can be achieved. In addition, color temperature is also an important indicator to characterize the quality of light source. The color temperature represents the hue of the light source and is expressed by the radiation temperature of the same color blackbody. The standards of LED lamps refer to the color temperatures around 6 000 K, 4 000 K and 3 000 K as positive white, neutral white and warm white respectively. In this paper, the effects of blue-green phosphor of nitrogen oxides on the color rendering index Ra and special color rendering index R 12 of white LED under three color temperatures of warm white, neutral white and positive white are systematically studied, and the packaging scheme of ultra-high index full-spectrum white LED is proposed.

With the development of society and the progress of the times, China's cement enterprises are gradually in line with international standards, and a large number of foreign products and services are pouring in, which brings unprecedented challenges to China's cement enterprises. Cement enterprises in China are facing many problems, such as how to improve the quality of cement, how to fundamentally improve the overall service quality, and how to change the traditional business philosophy. To solve these problems, enterprise resource planning (ERP) must be implemented. The integration and utilization of ERP and project management can make enterprises run in an integrated way and manage continuously, and realize the rational utilization and development of limited resources.