The CO₂  heat pump air conditioning system of new energy vehicle is designed, and the vehicle model of CO₂  heat pump module and heat management system is established based on KULI simulation. The effects of refrigerant charge, running time and compressor speed on the heat pump air conditioning system is studied, and the energy consumption is compared with the PTC heating system and the CO₂ heat pump air conditioning system without waste heat recovery. The results show that the optimal charge for full-service operation is 750 g; increasing the compressor speed can increase the cooling capacity, so that the refrigerant temperature in the passenger compartment and battery inlet can quickly reach the appropriate temperature, but the COP_h, COP_c are reduced by 2.5% and 1.8% respectively. By comparing it with PTC heating and CO₂ heat pump air conditioning systems without waste heat recovery, it is found that the energy consumption of this system is only for the PTC heating systems 42.5%, without waste heat recovery carbon dioxide heat pump air conditioning system of 86.6%. It greatly saves energy, but also increased the waste heat recovery function, so that the system supply air temperature increased by 26%, improve passenger cabin comfort. This  provides a reference for the future experimental research of CO₂ heat pump air conditioning and heat management system. 

Alfalfa is considered the most used forage crop in the world, its main use is for cattle feeding, due to its high nutritional value, specifically in protein and digestible fiber. Currently, the trend in agriculture is to reduce the application of chemicals and among them are fertilizers that pollute soil and water, so the adoption of new technologies and other not so new is becoming a good habit among farmers. Nanotechnology in the plant system allows the development of new fertilizers to improve agricultural productivity and the release of mineral nutrients in nanoforms, which has a wide variety of benefits, including the timing and direct release of nutrients, as well as synchronizing or specifying the environmental response. Biofertilizers are important components of integrated nutrient management and play a key role in soil productivity and sustainability. While protecting the environment, they are a cost-effective, environmentally friendly and renewable source of plant nutrients to supplement chemical fertilizers in the sustainable agricultural system. Nanotechnology and biofertilization allow in a practical way the reduction in the application of chemicals, contributing to the sustainability of agriculture, so this work aims to review the relevant results on biofertilization, the use of nanotechnology and the evaluation of the nutritional composition of alfalfa when grown with the application of biofertilizers.

Public recreation hubs play an important role in enhancing physical activities, social contacts, and the health status of a community. The quality of the experience in such a setting influences user satisfaction and dedication; however, there are limited studies that can adapt well-advanced conceptual frameworks to capture unique characteristics of the public recreation feature. This study investigates user expectations and perceptions of service quality within public recreation hubs in Gauteng Province, South Africa. Data collection was obtained through a cross-section of 385 respondents using a SERVQUAL instrument from 22 recreational hubs. Various statistical analyses were performed, of which the EFA produced a nine-factor solution and not the customary five SERVQUAL dimensions. Important findings include the emergence of an intersection of the constructs of empathy and assurance, thereby suggesting that the dimensions are perceived as connected in the context of relational services. In addition, program quality and community engagement came out as two other important dimensions, representing the expectation for pluralism in provision, or inclusiveness and participation. Demographic differences were significant, gender differences existed in the perception of tangibles and reliability. It provides useful recommendations for managers of recreational hubs and policymakers. It could improve tangible factors with standard maintenance activities, improved infrastructure, and coordinated operational routines that improve its reliability. Targeted training among the staff for empathy and reassurance, and programming targeted to meet demographic needs, can be helpful in serving the various needs. Community building strategies, such as participatory planning and outreach programs, help make the people who feel included in them and loyal to facilities stay. It will not only help in offering better service delivery but also ensure that facilities within such public recreation hubs last long. This work contributes to service quality theory because it applies the SERVQUAL framework in a community-based recreational environment and shows its practical benefit in service delivery improvement of public services. Further work should adopt longitudinal methods and multi-regional analyses in the development and refinement of such findings to enhance generalisability across settings. Results have important implications for the development of user-focused, sustainable public recreation services compatible with changing community needs.

This study explores the marginalization of a poor fishing community in Gwadar, Pakistan. The study provides an insight into how different levels of power, such as hidden, visible/pluralist, and invisible ideological powers, are used in policy arenas to hinder fishers’ access to participatory spaces, decision-making, and resource use. By employing Gaventa’s power cubes analytical model, we analyze fishers’ experiences and prevailing scenarios. Qualitative research methods were used to collect data, including in-depth interviews and participant observation. The finding shows that the interests of the fishing community in fishery policies and ongoing development projects are excluded both with intention and unintentionally. The exclusion of the local fisher community from key spaces brings interruptions and transformations that influence their lives. Due to this, they are induced to join insurgent groups to confront exclusion-based policies in Gwadar, Pakistan.