Nowadays, due to the tremendous development of data centers (DCs), studying the effective cooling methods that can face to the challenges such as the high power or heat flux dissipation and the efficient electricity consumption in DCs has never been unnecessary. Loop heat pipe (LHP), a two-phase heat transfer device, is being considered as one of the potential solutions for the above problems. This paper introduces the experimental study on the thermal performances of LHP functioning under gravity assisted condition with different working fluids that are water and ethanol (C2H5OH). This LHP has the flat-rectangular evaporator with the stainless-steel (SS) sintering wick installed inside. The results demonstrate that under the same condenser cooling condition, water LHP performed better than ethanol LHP. In the case of water LHP, when heating power was increased from 33 to 535 W, the temperature at the top surface of the heating block raised from 38oC to 110oC. With the ethanol LHP, this temperature reached 133oC at the heating power of 395 W. If temperature limitation of microprocessors functioning inside the DCs is recognized at 85oC, the cooling capabilities of LHP are 220 W and 350 W corresponding to the working fluid are ethanol and water respectively. In addition, the discussions about the difference in boiling heating transfer characteristics as well as condenser performances between water LHP and ethanol LHP are also presented in this study.

In loop heat pipes (LHPs), wick materials and their structures are important in achieving continuous heat transfer with a favorable distribution of the working fluid. This article introduces the characteristics of loop heat pipes with different wicks: (i) sintered stainless steel and (ii) ceramic. The evaporator has a flat-rectangular assembly under gravity-assisted conditions. Water was used as a working fluid, and the performance of the LHP was analyzed in terms of temperatures at different locations of the LHP and thermal resistance. As to the results, a stable operation can be maintained in the range of 50 to 520 W for the LHP with the stainless-steel wick, matching the desired limited temperature for electronics of 85 °C at the heater surface at 350 W (129.6 kW·m−2). Results using the ceramic wick showed that a heater surface temperature of below 85 °C could be obtained when operating at 54 W (20 kW·m−2).

BackgroundHuman papillomavirus (HPV) vaccination is an effective way to prevent cervical cancer. In Vietnam, there has been a lack of research specifically targeting the student population in the field of health sciences.ObjectivesThis study aimed to assess HPV vaccination knowledge, attitudes, and practices among health science students in Vietnam, focusing on differences between pharmacy students and other health science students.MethodsThe study used a cross‐sectional descriptive design, conducted at a medical university in southern Vietnam. This survey was managed by Google Form which was distributed online to students via posts on Facebook and student chat groups on health science courses on Message, Zalo.ResultsOut of the 1010 students surveyed, 213 (21.1%) were pharmacy students. There was no difference between pharmacy and non‐pharmacy students in terms of knowledge scores about HPV, cervical cancer (median = 7 vs. median = 7, p = 0.301), and vaccine knowledge (median = 8 vs. median = 7, p = 0.273). Pharmacy students had a less positive attitude toward HPV, cervical cancer, and HPV vaccines than non‐pharmacy students (median = 36 vs. median = 37, p = 0.014). Parents' education level, history of cervical cancer screening, HPV vaccine knowledge, and attitudes toward HPV, cervical cancer, and HPV vaccine were identified as significant factors influencing HPV vaccination in the women population.ConclusionPharmacy and non‐pharmacy students differ significantly in their attitudes toward HPV, cervical cancer, and HPV vaccines. These findings can help develop educational programs and counseling to improve students' understanding, awareness, and vaccination decisions.

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