An update of a simulation study of passively heated residemtial buildings

A simulation study of passively heated residential buildings” published in Procedia Engineering 2015 showed how circulating 15-17ºC water from a 50-m deep U-tube to a floor radiator and solar-heated water from a 30 evacuated tube solar collector and a 2-m3 indoor tank to a wall radiator could keep a 30-m2 Melbourne, Australia house thermally comfortable. This paper presents a summary of the ongoing review of publications together with three updates: - (1) Report on that water heated by a 100-metre deep U-tube is 22-24ºC, i.e., 2-4 ºC warmer than thermal comfort temperature. (2) May 2016 experimental validations of the simulated results which show that when the outdoors is below 10ºC, the temperature of the floor radiator is 2-4ºC less than the 15-17ºC water heated by a 50-m deep U-tube and 25 W fish tank pumps could circulate the waters. (3) Simulations with the addition of phase change materials (PCM) to inside faces show that though a PCM halves the diurnal indoor temperature variations, it confirms that such PCM does not significantly increase the 20ºC temperature in a 2-m3 storage tank at the end of winter. Therefore, the size of intersessional thermal storage would be a problem for family-sized houses. German Guidelines indicate that 1-2 boreholes could provide enough heat for family-sized houses. The heat extracted in winter can be replenished in summer. Thus the geothermal heat from about 100-m deep boreholes with 22-24ºC bottom temperature could sustainably keep residential buildings in cool climates similar to Melbourne's cool temperate thermally comfortable

Design and analysis of SRAMs for energy harvesting systems

PhD ThesisAt present, the battery is employed as a power source for wide varieties of microelectronic systems ranging from biomedical implants and sensor net-works to portable devices. However, the battery has several limitations and incurs many challenges for the majority of these systems. For instance, the design considerations of implantable devices concern about the battery from two aspects, the toxic materials it contains and its lifetime since replacing the battery means a surgical operation. Another challenge appears in wire-less sensor networks, where hundreds or thousands of nodes are scattered around the monitored environment and the battery of each node should be maintained and replaced regularly, nonetheless, the batteries in these nodes do not all run out at the same time. Since the introduction of portable systems, the area of low power designs has witnessed extensive research, driven by the industrial needs, towards the aim of extending the lives of batteries. Coincidentally, the continuing innovations in the field of micro-generators made their outputs in the same range of several portable applications. This overlap creates a clear oppor-tunity to develop new generations of electronic systems that can be powered, or at least augmented, by energy harvesters. Such self-powered systems benefit applications where maintaining and replacing batteries are impossi-ble, inconvenient, costly, or hazardous, in addition to decreasing the adverse effects the battery has on the environment. The main goal of this research study is to investigate energy harvesting aware design techniques for computational logic in order to enable the capa- II bility of working under non-deterministic energy sources. As a case study, the research concentrates on a vital part of all computational loads, SRAM, which occupies more than 90% of the chip area according to the ITRS re-ports. Essentially, this research conducted experiments to find out the design met-ric of an SRAM that is the most vulnerable to unpredictable energy sources, which has been confirmed to be the timing. Accordingly, the study proposed a truly self-timed SRAM that is realized based on complete handshaking protocols in the 6T bit-cell regulated by a fully Speed Independent (SI) tim-ing circuitry. The study proved the functionality of the proposed design in real silicon. Finally, the project enhanced other performance metrics of the self-timed SRAM concentrating on the bit-line length and the minimum operational voltage by employing several additional design techniques.Umm Al-Qura University, the Ministry of Higher Education in the Kingdom of Saudi Arabia, and the Saudi Cultural Burea

The Influence of E-Marketing Mix Strategy on Organizational Performance: An Empirical Analysis of Jordanian Smes

Purpose: The purpose of this empirical research article is to investigate the association between e-marketing mix strategy (EMMS) and organizational performance (OP) in Jordanian SMEs.   Theoretical framework: The study used a quantitative research methodology to explore the impact of EMMS factors on OP indicators, such as product development, pricing strategies, promotional activities, and online distribution channels.   Design/methodology/approach: The study's data is gathered using a survey questionnaire issued to 250 Jordanian SMEs. The dependent variables include OP indicators such as financial performance, customer happiness, market share, and innovation, whereas the independent variables are EMMS factors. Control factors including business size, firm age, and industry type are also taken into account. To evaluate the hypothesized correlations, the obtained data is analyzed using the PLS-SEM (PLS 4.0) technique.   Findings: The results of this study show that in the Jordanian context, all e-marketing techniques, including product development, price strategies, promotional activities, and online distribution channels, have a significant positive impact on OP metrics   Research implications: The findings of this study demonstrate the value of e-marketing and the necessity of sound e-marketing tactics for fostering the expansion and competitiveness of SMEs in the digital era.   Practical and social implications: The study underscores the significance of implementing e-marketing strategies for SMEs in Jordan, as they contribute to enhancing OP. Policymakers can utilize these findings to develop supportive measures for SMEs, while practitioners can gain insights into the value of e-marketing strategies in achieving growth and competitiveness.   Originality/value: This study adds to the current literature by investigating the association between EMMS and OP in Jordanian SMEs. The study adds to the field's knowledge base by providing empirical evidence and insights on the impact of various e-marketing methods on OP measures

Enhancement of Bending Strength of Helical Gears by Using Asymmetric Involute Teeth Profiles

This paper presents an alternative method to enhance the bending stress for helical gears achieved that by using Asymmetric Involute Teeth Profiles. Theoretically, ??the bending stress of a symmetric gear tooth is calculated by classical Lewis equation (1892), then this equation is developed by M.Q. Abdullah (2012) to take into account the effect of asymmetry of tooth profiles. In this paper, the bending stress for helical gear teeth with asymmetric profile has been calculated analytically by modifying the M.Q. Abdullah equation. In this paper, analytically this equation has been modified to find the bending stress for helical gear with asymmetric teeth at a specified number of teeth (14 teeth) at any helix angle. Also this value has been verified by using numerical solution based on the finite element method technique that done by the software Autodesk simulation mechanical is package v2014. Where the generation process of helical gear have been modelled by using 3D CAD Graphics Software Autodesk inventor professional 2014. The results of this work indicate to the most important conclusion of a helical gear drive with asymmetric teeth profiles having loaded side pressure angle of ( ) and unloaded side pressure angle of ( ) is better than a helical gear drive with symmetric teeth profiles having standard pressure angles of ( ) from the point of view of tooth bending strength. There are significant enhancement in the results of maximum tooth bending stress for asymmetric involute of tooth gear compared with the standard gear. In addition, the results demonstrate optimum helix angle is ( ) which has the highest enhancement percentage. Keywords: Gear, Helical, Involute profile, Asymmetric, Bending Stress, Autodesk inventor, Simulation

Applied Energy with Cleaner Environment and Smarter Schemes towards Industry 4.0

Applied Energy with Cleaner Environment and Smarter Schemes towards Industry 4.0 Applied energy refers to energy conversion when applied to energy systems for useful work production. Useful work output increases with higher energy efficiency and cleaner energy schemes. In recent years, major focus has been given to smart, clean energy systems and their potential for improving the overall power generation. As a result, many countries around the globe are now adopting various smarter, greener technologies coupled with optimum power and best practice environmental management. All these strategies when integrated with industrial digital transformation such as data visualization via real-time monitoring, internet of things, total automation, and so forth, lead to the Industry 4.0 notion. This talk will focus on the concept of smarter schemes and recent advancements in hybrid renewable energy technologies for energy conversion and how the hybrid energy systems may incorporate smarter and greener schemes towards Industry 4.0. Also, it will address Sarawak’s great potential and opportunity to make use of its ICT towards Industry 4.0 capabilities, provide further improvements to embrace such technologies. A conceptual design of a cleaner, smarter, megawatts level hybrid energy system at a typical selected seaside for both efficient rural-urban link electrical power generation and hydrogen production will also be discussed. Target audience: Students, Post doctoral, Industries, Researchers and Professors Keywords Applied energy; cleaner environment; smarter energy schemes, Industry 4.0

Comparison of the 2005 growth charts for Saudi children and adolescents to the 2000 CDC growth charts

Background and objectives: The 2000 CDC growth charts for the United States, a revision of the National Center for Health Statistics/World Health Organization (NCHS/WHO) growth charts, were released in 2002 to replace the NCHS/WHO charts. We evaluated the differences between the CDC growth charts and the Saudi 2005 reference to determine the implications of using the 2000 CDC growth charts in Saudi children and adolescents. Subjects and methods: The Saudi reference was based on a cross-sectional representative sample of the Saudi population of healthy children and adolescents from birth to 19 years of age. Measurements of the length/ stature, weight and head circumference were performed according to expert recommendations. The CDC charts from birth to 20 years were based on a cross-sectional representative national sample from five sources collected between 1963 and 1994. The data from the CDC study including the 3rd, 5th, 50th, 95th, and 97th percentiles were plotted against the corresponding percentiles on the Saudi charts for the weight for age, height for age, weight for height for children from 0 to 36 months and weight for age, stature for age and body mass index for children 2 to 19 years of age. Results: There were major differences between the two growth charts. The main findings were the upward shift of the lower percentiles of the CDC curves and the overlap or downward shift of the upper percentiles, especially for weight, weight for height, and BMI. Conclusions: The use of the 2000 CDC growth charts for Saudi children and adolescents increases the prevalence of undernutrition, stunting, and wasting, potentially leading to unnecessary referrals, investigations and parental anxiety. The increased prevalence of overweight and obesity is alarming and needs further investigation

Challenges and Opportunities to Improve Tuberculosis Screening Among Immigrant Plantation Workers in Sabah, Malaysia

Tuberculosis (TB) among immigrants has substantial contribution to the TB epidemiology in Sabah. This study aimed to determine the yield of screening for TB disease among immigrant plantation workers in Sabah, Malaysia. This was a prospective cohort study involving 482 legal immigrant workers aged 18 years and above, consented and available at study sites during the study period. Workers with previous history of TB or currently on TB treatment were excluded from participation. Symptom based questionnaire was administered along with both chest radiograph and sputum samples collection for symptomatics participants. Out of 482 plantation workers creened, there was no case of active TB detected among the 44 (9.1%) symptomatics participants. Finding of low TB yield in this study was rather unexpected but this indicates the real challenges for the local health authority to come out with more cost effective screening programs, including reducing stigma, in active TB screening among migrant population

Underlying the Causes and Impact of Crime Victimization: A Study of Urban Area in Bangladesh

In Bangladesh, like all other countries of the world Crime victimization has become a frightening, threatening and unsettling experience for many people. This study tries to trace the causes of different kinds of crime victimization and also tries to find out its impact on victims in relation to urban environment. Based on literature relate to victimization and collecting primary data from urban area’s victim, this study will enable researchers to explore the prevalence of crime in urban area and to identify the causes and impact of crime victimization on victims by analysing the demographic status of victim-offender, measuring the causal variables and several cost likely financial, physical etc. The subject of this study was composed of 3957 respondent’s selected from 12th city corporations including Dhaka city followed by probability sampling method for collecting information from the general peoples who have victimized. The study revealed that two-third of the offenders was unknown to the victim. The most common cause of victimization includes self-blaming (lack of awareness or carelessness) remained at the top reason, which constitutes 31 percent of the victim. This victimization has affected victims psychologically, physically and financially including several losses. The perceptions gathered through this study will helps to take important measures and strategies to ensure safe livelihood as well as increase the performance of the law enforcement agencies

An Empirical Study of Technological Innovations in the Field of Accounting - Boon or Bane

In this paper researchers make an attempt by doing intense work that how technological innovations make jobs of accountant so easy from their routine jobs from posting to generating accounting statements etc. with the help of available software and technology in accounting field.Technological innovations have changed an obstructed job of accountant into easier one and that too rapid and accurate, with these developments researchers have found and witnessed that it has affected erstwhile as it has restricted entry for so many into an accounting field  as jobs of accountants have shrunk and in few hands who are technology accelerators and technology driven.Researchers have shown how technology has affected the outcome and impact on business in terms of accuracy, pace and swiftness.Researchers have made an attempt to explore various cause and effect relationship between available software in accounting, technology and accountants.In their intense and in depth research we have designed questionnaire comprised of many questions in which respondents are selected from top management, employees and included job seekers too in order to receive their unbiased responses during primary data collection.Wherever found necessary researchers have taken secondary data also to make study more accurate, interesting and feasible

The study of production performance of water heater manufacturing by using simulation method

In industrial companies, as demand increases, decision-making to increase production becomes difficult due to the complexity of the model systems. Companies are trying to find the optimum methods to tackle such problems so that resources are utilized and production is increased. One line system of a manufacturing company in Malaysia was considered in this research. The Company produces several types of water heater and each type went into many processes, which was divided into twenty six sections. Each section has several operations. The main type of the product was 10G water heater which is produced most compare to other types, hence it was taken under consideration to be studied in this research. It was difficult to find the critical section that could improve the productions of the company. This research paper employed Delmia Quest software, Distribution Analyser software and Design of Experiment (DOE software) to simulate one model system taken from the company to be studied and to find the critical section that will improve the production system. As a result, assembly of inner and outer tank section were found to be the bottleneck section. Adding one section to the bottleneck increases the production rate by four products a day. The buffer size is determined by the experiment was six items