Under COVID-19, because of extensive online learning and the use of the internet for communication, there is a risk of intensification of Internet addiction (IA) in young people. Unfortunately, there are very few related studies in different Chinese contexts, including Hong Kong. In this study, we examined several research gaps in the literature with reference to university students in Hong Kong: a) prevalence of IA; b) socio-demographic factors related to IA; c) relationships between IA and other mental health problems and stressors (i.e., comorbidity); and protective factors for IA. To address the above research issues, we conducted an online survey in early 2021 (N = 1,648) using validated instruments on IA, psychological well-being, and stress. Based on the Young Internet Addiction Scale, roughly half of the respondents could be considered as showing excessive IA symptoms. Regarding demographic correlates of IA, younger students and those who experienced personal financial difficulty showed higher IA levels, and there was no observed gender difference. There were positive relationships between IA symptoms and mental health problems (depression, post-traumatic stress disorder, suicidal behavior, and hopelessness) and stresses (difficulties encountered and unmet psychosocial needs), suggesting co-morbidity of IA. IA was also negatively associated with positive psychological attributes such as flourishing and emotional competence, which could be regarded as factors protecting young people from IA. Results are discussed with reference to the different ecological risks and protective factors in IA amongst young people in the Chinese context.

The flow characteristics and dynamics parameters of two-phase flow inside the pipe and within annulus is very important for design and operation in aerated mud drilling. Under the constrain condition that proper gas/liquid ratio for given formation pressure of the well to be planned should be selected and two-phase flow pattern inside drillpipe and within annulus should be controlled, this paper applied multi-phase flow theory to calculate and control injecting pressure, injecting flow rate, friction pressure drop inside drillpipe and within annulus, pressure drop in nozzles and dynamic pressure along the wellbore in aerated mud drilling. Rheology of aerated mud, casing program, gas/liquid ratio, mud density, wellbore back pressure, drilling procedures were also analyzed. 5 experimental wells were drilled by using aerated mud in oilfield, Drilling operation show the theoretical model and calculating method are reliable, and the pressure of the aerated mud column can be reduced efficiently. The density of aerated mud ranges from 0.45g/cm3 to 1.2g/cm3, It can be used to explore and exploit low pressure low permeability reservoir and meet the requirements of underbalanced and/or balanced drilling. Aerated mud has good cuttings-carrying capability. Good wellbore stability was also obtained. Aerated mud drilling is a new technology that is worthy of paying attention and speeding. Introduction It is well known that balanced pressure and unbalanced pressure drilling can greatly promote penetration rate and prevent formation formation damage. Aerated mud could make the real balanced pressure drilling be realization. That means, under the condition of zero pressure difference between effective hydraulic column pressure and formation pressure, the drilling operation is still safely put into practice, even unbalanced pressure difference (Pme - Pp = - P). Besides, in general, the pressure factor of low pressure low permeability reservoir bed and the exploited long time reservoir is low. Obviously, these reservoir can not be exploited with conventional drilling fluid, whereas aerated mud two phase drilling fluid is very idea choose to these formation economically and safely. Now, the aerated mud density is able to be controlled to the rang of 0.45 1.2g/cm3, not only it can decrease the hydraulic column pressure in brothel, but also it has a good cuttings-carrying capability. Like regular mud, aerated mud returning back to surface and after degassed and removed drilled solids in surface, could be reused. Apparently, using Aerated mud is more economic thin foam mud (a one-used drilling fluid), furthermore, using Aerated mud is safer than air drilling fluid, because the latter often results from explosion and fire. Finally, even if formation fluid gets into hole, aerated mud drilling is safely operation. As a drilling circulation medium, aerated mud is different from pure drilling mud. Excepting that aerated mud drilling needs high pressure air compressor, rotating sealhead, gas/liquid separator, gas/liquid mixer, and wellhead nature gas detector and so on. P. 153

This study adapts a Medical English Language Anxiety Scale (MELAS) based on Horwitz’s Foreign Language Classroom Anxiety Scale (FLCAS) and examines students’ anxiety in medical English vocabulary, listening and speaking, communication, literature reading, and academic paper writing. The biographical factors related to medical English language anxiety (MELA) were also tested. The questionnaire sets including five dimensions were distributed to the students from a medical university in Sichuan, China, and were statistically analyzed by using SPSS 22.0 and AMOS 21.0. By employing the adapted MELAS, it was found that 85.2% of the medical students surveyed suffered moderate and higher anxiety. Among all dimensions, students with listening and speaking anxiety recorded the highest (89.3%), followed by literature reading anxiety (86.6%), English academic writing anxiety (85.9%), communication anxiety (81.9%), and vocabulary learning anxiety (81.2%). We also found that the anxiety of rural medical students in each dimension was higher than that of urban medical students. This study suggests that English teachers should be fully aware of their students’ language anxiety situation, design interesting class activities, and create a relaxed English learning atmosphere in classroom teaching to make students less nervous when learning medical English in class.

Formation pressure, failure pressure, wellbore collapse pressure and surge/swab pressure are important basis of pressure control in drilling progress, wellbore stability, balanced and unbalanced drilling, and well structural design. They are also fundamental data used in Drilling Engineering Design and Construction. Comprehensive well logging (sound logging, density logging, gamma logging) can be collected and handled intellectually by this system. Formation pressure, failure pressure, wellbore collapse pressure, and rock characteristic factor (dynamic elastic modulus, static elastic modulus, Poisson ratio, internal friction angle, effective stress modulus, shear strength, compressing strength, tensile strength) were predicted by this system. In this paper, calculation and analysis system to predict transient-state, pseudo-transient-state and steady-state pressure fluctuations were established by using theory of elastic liquid column and rigid liquid column (Three types of fluids, Bingham fluid, power law fluid, H-B fluid, were included in this system). This prediction system has the following features: Capacity to collecting and handling well logging curves intelligently; High accuracy to predict; Output pressure curves and pressure gradient curves also regression results. This prediction system can provide Drilling Engineering Design, working-on, balanced and unbalanced drilling, overflow and leaking control, safe trip in and trip out velocity, and wellbore stability with reliable data.

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