Numerical Investigation of Single-Row Double-Jet Film Cooling of a Turbine Guide Vane under High-Temperature and High-Pressure Conditions

Single-row double-jet film cooling (DJFC) of a turbine guide vane is numerically investigated in the present study, under a realistic aero-thermal condition. The double-jet units are positioned at specific locations, with 57% axial chord length (Cx) on the suction side or 28% Cx on the pressure side with respect to the leading edge of the guide vane. Three spanwise spacings (Z) in double-jet unit (Z = 0, 0.5d, and 1.0d, here d is the film hole diameter) and four spanwise injection angles (β = 11°, 17°, 23°, and 29°) are considered in the layout design of double jets. The results show that the layout of double jets affects the coupling of adjacent jets and thus subsequently changes the jet-in-crossflow dynamics. Relative to the spanwise injection angle, the spanwise spacing in a double-jet unit is a more important geometric parameter that affects the jet-in-crossflow dynamics in the downstream flowfield. With the increase in the spanwise injection angle and spanwise spacing in the double-jet unit, the film cooling effectiveness is generally improved. On the suction surface, DJFC does not show any benefit on film cooling improvement under smaller blowing ratios. Only under larger blowing ratios does its positive potential for film cooling enhancement start to show. Compared to the suction surface, the positive potential of the DJFC on enhancing film cooling effectiveness behaves more obviously on the pressure surface. In particular, under large blowing ratios, the DJFC plays dual roles in suppressing jet detachment and broadening the coolant jet spread in a spanwise direction. With regard to the DJFC on the suction surface, its main role in film cooling enhancement relies on the improvement of the spanwise film layer coverage on the film-cooled surface.

Né vittime, né carnefici. Cittadine. Un’analisi pedagogica dei ruoli delle madri nei percorsi di prevenzione alla radicalizzazione violenta e al terrorismo

Phenomenologies of Islamic terrorism, changing processes of radicalization to violence, and the suicide terrorist attacks perpetrated in many European countries, together constitute a complex educational topic. A topic that defies simplistic readings whereby the drawing of sharp boundaries between ‘us’ and ‘them’, or civilization and barbarism, organizes and reproduces morally reassuring analyses that relieve us of the duty to more thoroughly explore causes and areas of co-responsibility. A combination of pedagogical and gender based analysis can significantly contribute to advancing our knowledge of these phenomena and the related representations, deconstruct the processes underlying them, and inform the design of preventive interventions. More specifically, this article assesses the limitations and risks surrounding women’s role in prevention, also indicating ways in which the positive potential of this role may be explored; it is crucial to avoid re-essentializing the maternal and feminine, while supporting full recognition of women’s status as active and critical citizens

Nonlinear dynamics in the Jupiter magnetosphere: implications of dust-acoustic cnoidal mode

Different types of waves and their nature in the Jovian middle magnetosphere are still not clear or specified. For this purpose, a generalized hydrodynamic model for an arbitrary amplitude dust-acoustic waves is built for true Jovian magnetosphere. The plasma system consists of positive dust grains, Maxwellian ions and electrons. An evolution equation containing a Sagdeev potential is derived, and its numerical analysis is presented. Unexpectedly, the given data yielded cnoidal waves only with positive potential. The effect of the external magnetic field, Mach number, and directional cosine parameters are studied and manipulated. We think that the present results are important in realizing the main waves in the Jovian magnetosphere, and the possible correlation to its particlesístability and pole acoustic waves.

TOLERANSI BERAGAMA (Toleransi Masyarakat Muslim dan Budha di Dusun Sodong Perspektif Islam)

Indonesia sebagai negara yang majemuk memiliki beragam suku, bahasa, ras bahkan agama. Perbedaan itu menyimpan potensi positif sebagai kekuatan dan kekayaan bangsa. Namun demikian seandainya tidak dirawat dengan baik, potensi positif tersebut berubah menjadi negatif, yaitu konflik yang merugikan masing-masing pihak. Usaha untuk merawat kemajemukan tersebut adalah menumbuhkembangkan toleransi. Masyarakat Sodong sebagai kumpulan 2 (dua) komunitas beragama berbeda memberikan potret bahwa mereka telah mengimplementasikan hal tersebut secara intens dalam aspek sosial, ekonomi, politik dan bahkan persoalan agama. Hal ini tentu menimbulkan pertanyaan, bagaimana bisa penganut agama yang berbeda memahami dan mengejawantahkan toleransi yang begitu besar dalam kehidupan sehari-hari, padahal setiap agama secara lazim mempunyai ciri khas dan batasan-batasan hubungan dengan agama lainnya?, terkecuali daripada itu, bagaimana pandangan islam terhadap kenyataan tersebut, karena nyatanya islam sebagai agama pedoman hidup muslim memiliki pandangan sendiri kaitannya dengan toleransi. Penelitian ini bercorak field research dengan mendeskriptifkan terhadap persepsi dan perilaku masyarakat Sodong terhadap toleransi berikut pandangan islam terhadapnya. Hasil penelitian mengungkapkan bahwa toleransi agama yang terbangun di sana tidak semata-mata berlatar belakang agama, melainkan juga berasal dari aspek sosial, budaya dan politik. Praktik-praktik toleransi yang telah terjadi perlu penguatan, terutama di bidang sosial kemasyarakatan. Adapun pada persoalan yang bersinggungan dengan agama masih membutuhkan perhatian dan peran edukasi pemuka muslim agar toleransi tidak mengarah pada tindakan sinkretisme.Kata Kunci:Sodong, toleransi beragama. Indonesia as a pluralistic country has various ethnicities, languages, races and even religions. The difference holds positive potential as the strength and wealth of the nation. However, if it is not properly cared for, the positive potential turns into a negative one, namely a conflict that harms each party. Efforts to maintain this plurality is to cultivate tolerance. The Sodong community as a collection of 2 (two) different religious communities provides a portrait that they have implemented this intensely in social, economic, political and even religious aspects. This of course raises the question, how can adherents of different religions understand and manifest such great tolerance in daily life, even though every religion in general has characteristics and limitations on relations with other religions? to this fact, because in fact Islam as a religion as a way of life for Muslims has its own views regarding tolerance. This research is a field research by describing the perception and behavior of the Sodong community towards tolerance and the Islamic view of it. The results of the study reveal that the religious tolerance that is built there is not solely a religious background, but also comes from social, cultural and political aspects. Tolerance practices that have occurred need to be strengthened, especially in the social field. As for issues that intersect with religion, it still requires attention and the educational role of Muslim leaders so that tolerance does not lead to acts of syncretism. Keywords:Sodong, religious tolerance.

Influence of an electric field on flexopolarization induced by acoustic action on a liquid crystal

The work experimentally investigated the influence of an electric field on the direct flexoelectric effect that occurs under the influence of an acoustic field in liquid crystals. Thin layers of nematics 10-100 μm thick were studied. In this case, the liquid crystal sample was exposed to the piston method with an acoustic wave with a frequency of 1 kHz. The dependences of the first and second harmonics for different NLCs on the bias voltage value, shear amplitude, and crystal thickness were obtained. It was revealed that the flexosignal harmonics depend on the direction of the electric field; when a positive potential is applied to the movable plate, they take on smaller values than when negative. It was found that in low fields the magnitude of the flexosignal increases due to an increase in the amplitude of the director deviation, but at a critical value of the field it is suppressed, since the layer is stabilized by a constant electric field.

Characteristics of Surface Temperature and Its Relationship with Meteorological Elements in China in the Last 73 Years

Climate, as the natural environment on which human life depends, is intricately linked to human society. This paper focuses on the characteristics of temperature and its relationship with meteorological elements in China in the last 73 years. The data of this research is from NCEP/NCAR Reanalysis Monthly Means. This study adopts the Empirical Orthogonal Function (EOF) and Singular Value Decomposition (SVD) methods to study the surface temperature characteristics within China, and the synergistic variation between surface temperature and precipitable water content, wind field, and relative humidity in China. The results show that 1980s is a turning point for changes in surface temperature, precipitable water content, wind field, and relative humidity in China. Before 1980s, the temperature in China is low, while after this period, the temperature in China is high and China’s exposure to global warming has increased. Temperature is dominated by negative potential-phase oscillations with relative humidity and wind fields. In the north, temperature and precipitable water content have negative potential-phase oscillations, while temperature and precipitable water content have positive potential-phase oscillations in the south. In the central region of Xinjiang, temperature and precipitable water content have weak negative potential-phase oscillations, while temperature and wind field have positive potential-phase oscillations.

A Bibliometric Analysis of the Evolution of Six Sigma in the Context of Industry 4.0

Contemporary world with constantly increasing speed of change and rapid development of technologies is challenging companies to accustom to existing complexity. This led to the fact that various methodologies change accordingly. Practitioners and researchers are seeking the ways to ameliorate processes using emerging technologies. One of the methodologies is Six Sigma that has always been connected with technologies necessary for data collection and analysis. The emergence of new technologies might benefit or challenge Six Sigma. In this paper an attempt has been performed to analyze the trends in research output of the conjunction of Industry 4.0 technologies and Six Sigma methodology. This paper is based on the bibliometric analysis. In the process of analysis, it was found that the combination of Six Sigma methodology and Industry 4.0 technology has positive potential, however, not all of the technologies have been analyzed.

Mental Logout: Behavioral and Neural Correlates of Regulating Temptations to Use Social Media

Individuals sometimes use social media instead of sleeping or while driving. This fact raises the crucial need for—and challenge of—successfully self-regulating potent social-media temptations. To date, however, empirical evidence showing whether social-media temptations can be self-regulated and how self-regulation can be achieved remains scarce. Accordingly, the present within-participants study ( N = 30 adults) provided causal evidence for self-regulation of social-media content and identified a potential underlying neural mechanism. We tested the premise that successful self-regulation requires limiting the mental representation of temptations in working memory. Specifically, we showed that loading working memory with neutral contents via attentional distraction, relative to passively watching tempting social-media stimuli, resulted in reduced self-reported desire to use social media, reduced initial attention allocation toward social-media stimuli (reduced late-positive-potential amplitudes), and reduced online representation of social-media stimuli in working memory (reduced contralateral-delay-activity amplitudes). These results have important implications for successfully navigating a social-media-saturated environment.

Route outlining of humanoid robot on flat surface using MFO aided artificial potential field approach

Humanoid robots, with their overall resemblance to a human body, is modeled for flawless interaction with human-made tools or the environment. In this study, navigation of humanoid robot using hybrid Artificial potential field (APF) and Moth flame optimization (MFO) approach have been performed. The hybrid approach provides the final turning angle (FTA), which is optimum to avoid collision with the hindrances. APF utilizes a negative potential field and a positive potential field to find the location of obstacles and target, respectively. The navigation starts towards the target; when the robot interacts with the obstacle, APF provides an intermediate angle (IA). The IA, along with the position of the obstacle, is fed into MFO as an input. This technique provides the FTA (optimum) to avoid collisions and guide a robot to the target. It is implemented in a single humanoid system and a multi-humanoid system. The presence of multiple humanoids can create the chance of inter-collision. It is dismissed by employing a dining philosopher controller to the proposed technique. Simulations and experiments are accomplished on simulated and real humanoid NAO. The coherency in the behavior of the results evaluated by the simulations and real-time experiments demonstrates the efficiency of the proposed AI technique. Comparisons are performed with a previously used method to validate the robustness of the technique.