Valve contained pipelines have witnessed a great growth and there exists a lot of noise caused by valves. Thick perforated plates are especially used is valve contained pipelines for the noise control, but there are limited literatures about its noise control performances under different structural parameter of thick perforated plates, which limits its popularization and application. In this paper

By assuming the neutral axis is perpendicular to the bending plane, this paper presents a general analytical solution to predict the limit bending moment for pipes with two inner surface circumferential flaws under combined internal pressure and bending moment. The circumferential stress caused by internal pressure is taken into account through Mises yield criterion. Based on the general solution,

Hydrogen refueling station is one of the most important parts for the hydrogen energy utilization. In this paper, a novel high multi-stage pressure reducing valve (HMSPRV) is proposed, which can be used for hydrogen stable decompression in hydrogen refueling station. In HMSPRV, the inner and outer porous shrouded valve core is used to replace piston valve core to achieve the first-stage throttling

The pilot-control globe valve (PCGV) is a new kind valve with simple structures and low driving energy consumption. It can utilize the pressure difference before and after the valve to control the action of the valve core. However, systematic theoretical research and numerical analysis are deficient at present. In this paper, the mathematical model of PCGV is established and Computational Fluid Dy

In 2007, Chinese Ministry of Education (MOE) and Ministry of Housing & Urban-Rural Development (MOHURD) carried out the Campus Resource Conservation Actions, in order to take full use of resources and to improve the energy efficiency. However, due to the large amounts of universities, the total energy consumption and the energy efficiency situation have no objective statistics. Taking modeling

A novel pilot-control globe valve, which can be used in vertical pipelines with a lower driving energy consumption, is proposed. A governing equation for valve core motion is obtained through a theoretical analysis of the forces applied on the valve core. A 3D simulation of valve core motion is conducted in Fluent by using User Defined Function (UDF) to involve different spring stiffness, steady s

The main objective of this paper is to study the characteristics of flow-induced noise in high pressure reducing valve (HPRV) and to provide some guidance for noise control. Based on computational fluid dynamics (CFD), numerical method was used to compute flow field. Ffowcs Williams and Hawkings Model was applied to obtain acoustic signals. The unsteady flow field shows that noise sources are loca

The interactions of the anionic bile salt NaGDC with three triblock copolymers based on poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), denoted P65, P123 and F127, were investigated using high-sensitive differential scanning calorimetry (DSC), turbidimetry, dynamic and static light scattering and small angle X-ray scattering (SAXS). P65 and P123 had the same hydrophilic PEO block lengt

The deinstitutionalization of mental health care has changed the responsibilities of involved authoritiesand has led to a continuous need for new treatment forms and interventions. This articledescribes this development in Europe, and in particular how these new conditions have been handledin Sweden over the past 20 years at the level of governmental policy-making. Three major policydocuments from

When developing Community Mental Health Services to support people with psychiatric disabilities, European countries are advocating evidence-based practice (EBP). Individual Placement and Support (IPS) is an evidence-based model designed to support people in acquiring and maintaining competitive employment. Implementation science is a growing research field, with a focus on components that impact

När den statliga revisionen har ett främjande syfte och är problemorienterad kan värdet av revisionen inte utvärderas på traditionellt sätt. Då ligger värdet främst i själva granskningsprocessen och i det kunskapsutbyte som sker under denna. För att undersöka hur Riksrevisionens effektivitetsrevisioner upplevs, har en enkätstudie genomförts. Studien riktade sig till involverade i granskningarna un

Att göra problemen i Riksrevisionens ledning enbart till en fråga om felrekryteringar, såsom Gunnar Axen gör i sin replik, är att göra det lätt för sig. Riksrevisorerna i Sverige har betydligt mer makt än riksrevisorer i övriga nordiska länder. Det finns därför en gräns för hur fritt spelrum de bör ha. Oberoende ska inte föranleda beröringsskräck och det vaccinerar inte mot ansvar. Oberoende ska i

This article presents a corpus-based analysis of stance in a specialized corpus of annual and corporate social responsibility (CSR) reports. It investigates how companies use stance expressions to construct and promote a positive corporate identity in order to gain the trust of the stakeholder groups that these texts target. The results show that companies profile distinct identities in annual and

The purpose of this paper is to describe and produce a more profound understanding of how communication professionals perceive that they realize strategic communication in organizations. Another aim is to deepen the understanding of what consequences the strategic work with communication has for the co-creation of meaning in which the organization is constituted. The paper is based on a qualitativ

Recognition and removal of apoptotic and necrotic cells must be efficient and highly controlled to avoid excessive inflammation and autoimmune responses to self. The complement system, a crucial part of innate immunity, plays an important role in this process. Thus, apoptotic and necrotic cells are recognized by complement initiators such as C1q, mannose binding lectin, ficolins, and properdin. Th