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In order to adjust and test 500mm-caliber, Sm-focus resource satellite camera, basing on no focal-power adjustment, we have designed and produced a unique parallel light tube. This tube focus is 20m, but tube-length is only 8m different from an old by using magnifying-adjustment technology. Which is an internal pioneer, has a novel shape and longest focus. Because shorter tube length, it is influenced smaller by environment. The study open an new road to without taking out vacuum and low manufacturing expense. This paper introduces the key technology of design, adjusting and testing about the tube. At last relates manufacturing experience and improving thought. keywords: collimator, 620-caliber, 20m-focus, 8m-length oftube, adjust, test 1. A NEW PROBLEM 1.1 In order to adjust and test a camera A remote sensing camera ofresource satellite is studied. Parameters ofthe camera are as follows,: calibre D = 500 mm focus •f' =SmIn order to adjust and test the camera, we have designed and manufactured a parallel light tube whose unique particuhr is 620mm-calibre and 20m-focus.

The effects of crises vary among individuals, societies, and nations. Governments' crisis management is quite different from that of non-governmental organizations, especially in terms of “publicity,” since it involves bureaucracy to address people's accountability concerns. The purpose of this study is to investigate the relationship between students' crisis awareness, trust, and emotions in the event of a major public health emergency. A questionnaire survey was conducted for this study. A total of 500 copies of questionnaires were distributed to the college students in Jiangxi. Among those, 437 valid copies were retrieved, with a retrieval rate of 87%. A structural equation model (SEM) was used to conduct the statistical analyses. The research results were summarized as follows: (1) At the stage of epidemic spread, people can easily fall into the negative emotion. (2) The society with a good trust relationship considers schools less responsible for critical incidents and more helpful for crisis communication. (3) Reducing the negative emotions of the public after the occurrence of critical incidents can effectively reduce the damage of critical incidents to the organization. Avoiding a loss of student confidence and increasing anger, protecting the school's reputation, having a good communication effect, and minimizing the impact of the crisis can help the students develop better trust toward the school. When a crisis occurs on campus, this can reduce the possibility of students' showing negative emotions and spreading rumors. It is considered that the findings provide guidance on how to optimize the management of public health crisis situations and improve students' mental health.