| 1. |
- Arslan, Muhammad, et al.
(author)
-
Impact of Varying Load Conditions and Cooling Energy Comparison of a Double-Inlet Pulse Tube Refrigerator
- 2020
-
In: Processes. - : MDPI. - 2227-9717. ; 8:3
-
Journal article (peer-reviewed)abstract
- Modeling and optimization of a double-inlet pulse tube refrigerator (DIPTR) is very difficult due to its geometry and nature. The objective of this paper was to optimize-DIPTR through experiments with the cold heat exchanger (CHX) along the comparison of cooling load with experimental data using different boundary conditions. To predict its performance, a detailed two-dimensional DIPTR model was developed. A double-drop pulse pipe cooler was used for solving continuity, dynamic and power calculations. External conditions for applicable boundaries include sinusoidal pressure from an end of the tube from a user-defined function and constant temperature or limitations of thermal flux within the outer walls of exchanger walls under colder conditions. The results of the system's cooling behavior were reported, along with the connection between the mass flow rates, heat distribution along pulse tube and cold-end pressure, the cooler load's wall temp profile and cooler loads with varied boundary conditions i.e. opening of 20% double-inlet and 40-60% orifice valves, respectively. Different loading conditions of 1 and 5W were applied on the CHX. At 150 K temperature of the cold-end heat exchanger, a maximum load of 3.7 W was achieved. The results also reveal a strong correlation between computational fluid dynamics modeling results and experimental results of the DIPTR.
|
|
| 2. |
- Chwialkowska, Agnieszka, et al.
(author)
-
Co-creating value and well-being experiences in physiotherapy services
- 2022
-
In: Journal of Services Marketing. - : Emerald Group Publishing Limited. - 0887-6045. ; 37:1, s. 12-24
-
Journal article (peer-reviewed)abstract
- Purpose: The purpose of this paper is to study the US-based (American) physiotherapy customers’ goals to engage in value cocreation activities during their well-being experience. Design/methodology/approach: The authors perform Smart PLS-SEM analysis of the primary data of physiotherapy service customers in the USA. Findings: The findings show that the US well-being customer engages in physiotherapy for individualizing, empowering, development, concerted and ethical motives but not for relating motives. These findings are contrasted with previous research to show that the service-dominant logic is not sufficient to account for the contextual complexity of the well-being experience and to explain the identified differences across culturally different customer segments. Research limitations/implications: By integrating insights from health-care and cross-cultural literature, the authors highlight the importance of relationship dynamics, culture and institutional context in well-being sector and develop a more comprehensive understanding of the cocreation behaviors in this industry. This helps advance the value cocreation research in well-being sector and promote the well-being experiences such as physiotherapy. Originality/value: The authors draw from a variety of disciplinary perspectives and challenge the service-dominant (S-D) logic as insufficient in explaining the value cocreation between the customer and expert in the well-being sector. The authors adapt physician–patient relationship model from health-care literature and cultural values of power distance from cross-cultural literature to complement the S-D logic to account for the complexity and nuanced context of the well-being cocreation experience.
|
|
| 3. |
- Hameed, Arslan, et al.
(author)
-
ZIF-12/Fe-Cu LDH Composite as a High Performance Electrocatalyst for Water Oxidation
- 2021
-
In: Frontiers in Chemistry. - : Frontiers Media S.A.. - 2296-2646. ; 9
-
Journal article (peer-reviewed)abstract
- Layered double hydroxides (LDH) are being used as electrocatalysts for oxygen evolution reactions (OERs). However, low current densities limit their practical applications. Herein, we report a facile and economic synthesis of an iron-copper based LDH integrated with a cobalt-based metal-organic framework (ZIF-12) to form LDH-ZIF-12 composite (1) through a co-precipitation method. The as-synthesized composite 1 requires a low overpotential of 337 mV to achieve a catalytic current density of 10 mA cm−2 with a Tafel slope of 89 mV dec−1. Tafel analysis further demonstrates that 1 exhibits a slope of 89 mV dec−1 which is much lower than the slope of 284 mV dec−1 for LDH and 172 mV dec−1 for ZIF-12. The slope value of 1 is also lower than previously reported electrocatalysts, including Ni-Co LDH (113 mV dec−1) and Zn-Co LDH nanosheets (101 mV dec−1), under similar conditions. Controlled potential electrolysis and stability test experiments show the potential application of 1 as a heterogeneous electrocatalyst for water oxidation.
|
|
| 4. |
- Hussain, Nazim, et al.
(author)
-
Firm absorptive capacity : multidimensionality, drivers and contextual conditions
- 2022
-
In: Journal of Knowledge Management. - : Emerald Group Publishing Limited. - 1367-3270 .- 1758-7484. ; 26:10, s. 2718-2742
-
Journal article (peer-reviewed)abstract
- Purpose: This paper aims to enrich absorptive capacity literature by specifically highlighting and adding environmental conditions and internationalisation process to the original conceptualisation.Design/methodology/approach: The authors undertake a conceptual analysis and present an enhanced framework of absorptive capacity by integrating multiple literature streams. The authors have analysed the most relevant literature to provide underlying justifications for the proposed conceptual model. Findings: Absorptive capacity ensures the long-term survival and success of a business. To develop absorptive capacity successfully, firms should focus on its various dimensions and existing intangible assets and external environment. The multidimensionality and richness of absorptive capacity is an under-explored area in the existing literature. The authors revisit the conceptualisation of absorptive capacity and add environmental conditions and the internationalisation process to the original conceptualisation. Absorptive capacity does not lead to a competitive advantage independent of its environment. To successfully develop it, firms have to adopt a holistic approach by considering the multi-dimensions, drivers and contextual conditions of absorptive capacity. Originality/value: This study contributes by conceptualising absorptive capacity as a dynamic capability. It is one of the first studies to specifically propose a framework that combines antecedents (prior knowledge, combinative capabilities and IT capabilities), moderators (environmental conditions, namely, market and technological turbulence, competitiveness and the internationalisation process) and consequences (competitive advantage). The study offers a unique conceptualisation with implications for researchers and managers. As a result, managers will have a well-defined blueprint to create value by using firm capabilities.
|
|
| 5. |
- Ullah, Zahid, et al.
(author)
-
Natural fibers and zinc hydroxystannate 3D microspheres based composite paper sheets for modern bendable energy storage application
- 2023
-
In: Journal of Applied Polymer Science. - : John Wiley & Sons. - 0021-8995 .- 1097-4628. ; 140:1
-
Journal article (peer-reviewed)abstract
- For modern high-tech flexible energy storage devices, it becomes important to synthesize micro-/nanostructures as per the required shape and morphology with superior physical and electro-active characteristics. This work shares the fabrication and characterization of ZnSn(OH)(6) (Zinc hydroxystannate [ZHS]) prepared by facile microwave-assisted technique and furthermore converted into flexible sheets by employing lignocelluloses (LC) known as natural fibers, collected from Carica papaya leaf petiole as a substrate to provide the flexible matrix. X-ray diffraction measurements confirm the successful crystalline structure of ZHS. Scanning electron microscopy and transmission electron microscopy showed the solid spherical structure of ZHS microspheres. Fourier transform infrared spectrometry and Raman spectroscopy confirmed the composite formation of ZHS and LC-based composite sheets (ZHS/LC sheets). Electrochemical measurements that is, cyclic voltammetry (CV), Galvanostatic charge/discharge, and electrochemical impedance (EIS) spectroscopy revealed the electroactive behavior of ZHS/LC paper sheets as working electrode for energy storage applications. CV measurements revealed the specific capacitance of 100 F/g and EIS measurements confirmed the decrease in the resistance of LC fiber after the growth of ZHS microspheres. Presented flexible ZHS based paper sheets will be highly feasible for the modern bendable/flexible/disposable energy storage applications.
|
|
| 6. |
|
|
