The experimental teaching of safety engineering is mainly divided into two parts: theoretical teaching and experimental teaching. At present, the traditional experimental teaching mode is mostly teacher-centered, which leads to students' lack of autonomy. The traditional experimental teaching mode has three disadvantages: ① most experiments are confirmatory experiments, which is not conducive to cultivating students' innovative thinking; ② Problems can't be fed back to teachers in time, which leads to low learning efficiency; ③ The utilization rate of experimental equipment is low. In view of the disadvantages of traditional teaching, the Safety Department of University of Science and Technology Beijing has continuously improved its teaching mode. At present, the construction of safety engineering laboratory information platform is a great achievement of experimental teaching in safety department. This platform overcomes the problems existing in traditional experimental teaching. Students can make an appointment for innovative project experiments and exchange learning problems online, which improves learning interest and efficiency.
Second, the connotation of safety engineering laboratory information platform
Safety engineering laboratory information platform refers to a platform based on safety engineering specialty, under the guidance of modern advanced management concepts, relying on information technology, integrating all experimental elements (laboratory personnel, experimental equipment and experimental environment), thus improving the utilization rate of experimental resources and the efficiency of teaching and scientific research [1, 2]. To put it simply, the information platform of the laboratory is to move various related elements to the Internet, and use the convenience of the network to improve students' learning interest and efficiency, as well as the management efficiency of the laboratory. The core of informatization is the development, management and effective utilization of information resources. The information construction and network management of experimental teaching can not be realized by simple infrastructure construction and the accumulation of technical products [3, 4]. Therefore, information construction should be both soft and hard, with emphasis on the management and use of hardware and the development and utilization of software resources. Informatization construction should be oriented to practical application, just as practice is the only criterion for testing truth. Only by continuous application can we understand the existing defects, make the informatization construction have the power of sustainable development, promote the standardized management of informatization construction and keep the internal data of the system updated in time.
Third, the construction of laboratory information platform
The experimental teaching center takes experimental teaching as the core, and experimental teaching and laboratory management are integrated. The informationization of experimental teaching should be closely related to the experimental teaching process and laboratory management process to form a whole, so as to truly realize informationization. The information platform construction of safety engineering laboratory in our school includes three aspects: hardware infrastructure, software infrastructure and laboratory management system construction.
1. Hardware infrastructure. The hardware system of the laboratory includes two parts: experimental equipment and network communication system. The safety engineering direction of our school is mine safety, so most of the experiments are related to mines, such as safety man-machine experiment, cyclone dust removal experiment, dust dispersion experiment, ventilator performance experiment, coal spontaneous combustion programmed temperature rise experiment, coal flash point and ignition point determination experiment, human carbon dioxide metabolism experiment in mine safety space, 20-liter spherical explosion experiment and so on. The laboratory equipment mainly includes SYP 100 1-2 open flash point and ignition point tester, dust generator, dust collector, ventilator, 20L spherical explosion test system, etc. It laid a foundation for building a laboratory information platform. The public information service system of the school provides the necessary foundation and conditions for informatization: the office and laboratory of the center can be connected to the campus network; Can provide WWW service, email service, FTP service and campus network-based service; Provide office automation system, educational administration information system, asset management information system, etc. In the design of the laboratory, the design concept of digital campus is fully integrated. The network bottom design of the experimental center has realized the broadband network from 100M to the laboratory and from 100M to the experimental device. The high voltage center is designed to remotely control the high voltage of each laboratory, and each weak current center can manage, monitor and answer questions for each laboratory.
2. Software infrastructure. The construction of software infrastructure is mainly the construction of information resources, which refers to the collection of teaching resources and students' experimental process and results. In the process of building an information platform, in order to facilitate students to find relevant information resources, we initially built a clear and classified construction framework. Under this framework, the integration of teaching content, teaching activities and various resources can be realized, and the interface of students and teachers logging in at the same time can be designed, which can fully adapt to the information resource construction planning of open and innovative experimental teaching and play a better teaching function. The construction of software foundation is divided into two modules: network resources and laboratory construction resources. Network resources include four parts: comprehensive sharing information subsystem, experimental courseware subsystem, experimental knowledge expansion subsystem and experimental software subsystem. Laboratory construction resources include instrument database subsystem and teacher-student interaction subsystem.
The main contents of laboratory comprehensive sharing information subsystem include laboratory development history, laboratory scale, experimental projects that the laboratory can undertake, teaching staff, management mode and construction characteristics. The experimental courseware subsystem designs experimental teaching courseware according to the experimental purpose, experimental principle, instrument introduction, data result evaluation, experimental feedback and summary, experimental multimedia demonstration and so on, which provides useful materials for students to preview in advance. Experimental knowledge expansion subsystem such as anecdotes, daily phenomena and engineering applications. The instrument database subsystem includes the introduction, running history, running environment, possible faults, solutions and service information of instruments and equipment; Teacher-student interaction subsystem, students can leave a message directly for doubts in the process of doing experiments, and the message information can be set to public; Experimental software subsystem refers to commonly used software such as FLUENT, ACCESS, CAD, FLAC, etc. To set the permissions of certain software, you must log in to this system to use it.
3. Laboratory management system. The laboratory management system of our school's safety engineering information platform includes three systems: credit card authentication system, innovation experiment system and evaluation system.
(1) credit card authentication system. The link between the credit card authentication system and the open management system of students' online course selection realizes the integrated management functions such as remote reservation, authority control and distribution, authority control and experiment log. Students make an appointment for the content and time of the experiment, swipe the campus card at the experiment center to authenticate their identity, and open the access control system of the laboratory to enter the laboratory. Because the experiment is completed within the scheduled time, it can avoid the situation that the experimental instruments are occupied and the experiment cannot be carried out. At the same time, teachers can check the attendance rate of students by swiping their cards, and remind students who have not taken time off or attended classes through the platform. When students swipe their cards, the card swiping system will display information such as experiment name, instructor, experimenter, experiment time, experiment platform number, etc., and then transmit the information to the main management system, and the main management system will turn on the power of the experiment location. During the experiment, experimental data and phenomena should be recorded on the computer in time, and students can communicate with teachers, classmates and information platforms when they encounter problems. After the experiment, swipe your card and leave, the power supply will be cut off automatically, and the experiment log will be generated online.
(2) Innovative experimental system. The innovation experiment system is mainly designed for students' innovative ideas, independent experiments or experiments required by natural fund projects. Under this system, students need to submit an experimental application in advance, stating the name, purpose, process, person in charge, instruments, possible experimental phenomena and dangers of the experiment to be done. After the platform receives the application, it needs to be reviewed. Can the laboratory undertake the experiment and evaluate its value? Finally, the audit opinion is given, and the examination and approval time does not exceed one week. If approved, students can carry out the experiment according to the routine experimental process, but the rules and regulations of the laboratory must be strictly observed during the experiment, and the database of experimental equipment should be established with the teacher after the experiment. If the approval is not passed, the platform should give specific reasons, explore improvement methods, and try to help students realize innovative ideas. Up to now, the innovative experiments successfully undertaken by the information platform include the numerical simulation of the formation and evolution law of floating coal spontaneous combustion circulation system, the numerical simulation of the control effect of three-state coupling on circulation system, the fire prevention and extinguishing performance experiment of solid dry ice material, the fire prevention and extinguishing performance experiment of solid sodium bicarbonate material, the water-soil ratio optimization experiment in yellow mud, and the performance optimization experiment of three-state material. National Natural Science Foundation Project "Study on Gas Production Mechanism of Dissolved Esterified Coal".
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