The influence of observation environment on background noise level of gPhone gravimeter

Based on the observations of 36 gPhone gravimeters in 2015, the background noise levels in the seismic frequency band（200-600 s） and sub-seismic band（1-6 h） are calculated. The differences in the PSD（power spectrum density） of each band of gPhone gravimetric gauges in different surrounding environments were analyzed and compared with Peterson＇s NLNM（new low-noise model） which is derived from the envelope at the power spectrum density of 75 seismograph stations around the world. The results showed that： the influence of station type on the noise magnitude of gPhone gravimeter is very small; The seismic band noise magnitude（hereinafter referred to as SNM） and the sub-seismic band noise magnitude（hereinafter referred to as SSNM） in the coastal gPhone gravimeter are higher than those of inland stations. Although the local hydrological change has a great influence on the gravity observation, the rainfall is not directly relative to the noise magnitude of the instrument. Except 3 coastal stations, the eight stations which had the highest amplitudes in the SNM were located near the seismic belt. This indicates that the SNM of the gPhone Gravimeter may reflect some seismic information.Compared with the NLNM model, the PSD of the gPhone gravimeter is lower than the NLNM model in the long period band（〈3×10^（-5）Hz）, indicating that the gPhone gravimeter is more suitable for detecting long-period signals（〉10 h） than the seismometer.

Analysis on Influential Factors of Corporate Environmental Management Level Based on ISM

Environmental problem is one of complicated social problems. According to the level of corporate environmental management, there are many influential factors, and their relations are also complicated. In this paper, we analyzed influential factors of corporate environmental management through consultation of experts. And based on the analysis, we applied interpretative structural modeling（ISM） to classify 13 influential factors into 3 levels. We hope it will be useful for the subsequent research and evaluation of corporate environmental management level.

Measurements of the Cognitive Level of Ecotourists for the Tourism Environment in the Mountain Resorts

Tourists are the main body of tourism activities,and studying the environmental cognition of tourists is beneficial for the environmental management of scenic spots.In this article,data obtained by questionnaire were used to compose a data matrix of 169×10 dimensions,and the cognitive level of ecotourists for the tourism environment was measured by two-way indicator species analysis(TWINSPAN)and detrended correspondence analysis(DCA)in Luya Mountain Nature Reserve.This analysis revealed three main points.(1)TWINSPAN divided all the samples into the strict environment protection type,the ordinary environment protection type,the occasional environment protection type,and the natural enjoyment type.Both the strict and ordinary environment protection types agreed with biocentrism and had a consciousness regarding the protection of nature,but the former advocated that tourism activities should be restricted in nature reserves,while the latter did not agree with restrictions on tourism activities.The occasional environment protection types denied biocentrism;on the one hand,they thought that nature should serve human beings,but on the other hand,they showed a tendency toward environmental protection.The natural enjoyment type argued that natural resources should be maximized to meet human needs.(2)There were significant correlations between the first axis of the DCA and gender,age,education,number of trips,and cognition of nature reserve function,and the second axis of DCA was significantly correlated with gender,age,and education level.Under the impact of all the factors in the DCA figure,ecotourist types transitioned gradually from the first type to the second,the third,and the fourth types along the diagonal line,and accordingly,their cognitive level for the tourism environment was reduced slowly.(3)For nature reserves,the strict environment protection type had 74 people,who was the most popular.The ordinary and occasional environment protection types had 43 people and 31 people,respectively,who should be strived to raise environmental awareness.The natural enjoyment type had 21 people,who must be systematically educated.