scholarly journals Estimation of quantities, metal concentrations in components and management of waste rechargeable lighting devices in Nigeria

2021 ◽  
Vol 32 (1) ◽  
pp. 63-69
Author(s):  
Gilbert U. Adie ◽  
Izubundu Brown Onyebuenyi
Keyword(s):  
Power Supply ◽  
Online Survey ◽  
Hazardous Materials ◽  
Printed Wiring Board ◽  
Average Life ◽  
Alternative Source ◽  
Average Life Span ◽  
Permissible Limits ◽  
Wiring Board ◽  
High Lead

Abstract Rechargeable lighting devices are used in Nigeria as alternative source of lighting due to epileptic power supply. They contain printed wiring board, battery and plastic casings containing heavy metals. This waste category is often neglected and disposed of with household garbage with concomitant deleterious consequences on environment. We estimated quantities, disposal methods and concentrations of selected metals in some components of 34 waste rechargeable lighting devices in Nigeria. Estimated quantities and disposal methods were carried out through online survey. Leached metals were prepared and analyzed using standard methods. Approximately 6000 tons/year of waste rechargeable lighting devices were estimated. An average life span of 9 months and 4 rechargeable lighting devices were estimated to be used per household in Nigeria. The commonest disposal method was with household garbage. Lead and copper contents on the boards and Pb in battery electrodes were far higher than permissible limits. All metals determined in plastic casings were within permissible limits. High lead and copper contents in some components makes waste rechargeable lighting devices to be regarded as hazardous materials and should be handled with care at disposal.

Effective Thermal Conductivity of Six Sigma’s Copper Reinforced Column Grid Array Interconnect for Ceramic Microelectronic Packages

2010 ◽  
Author(s):  
Mark Eblen
Keyword(s):  
Thermal Conductivity ◽  
Integrated Circuits ◽  
Effective Thermal Conductivity ◽  
Flip Chip ◽  
Heat Removal ◽  
Thermal Design ◽  
Printed Wiring Board ◽  
Wiring Board ◽  
High Lead

Thermal management of flip chip style integrated circuits often relies on thermal conduction through the ceramic package and high lead solder grid array leads into the printed wiring board as the primary path for heat removal. Thermal analysis of this package configuration requires accurate characterization of the sometimes geometrically complex package-to-board interface. Given the unique structure of the Six Sigma column grid array (CGA) interconnect, a detailed finite element submodel was used to numerically derive the effective thermal conductivity with comparisons to a conventional CGA interconnect. Once an effective thermal conductivity value is obtained, the entire interconnect layer can be represented as a fictitious cuboid layer for inclusion in a more traditional “closed-form” thermal resistance calculation. This method allows the package designer a quick and robust method to evaluate initial thermal design study tradeoffs.

Toward Manufacturing Low-Cost, Large-Area Electronics

MRS Bulletin ◽  
2006 ◽  
Vol 31 (6) ◽  
pp. 471-475 ◽  
Author(s):  
Marc Chason ◽  
Daniel R. Gamota ◽  
Paul W. Brazis ◽  
Krishna Kalyanasundaram ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Printed Electronics ◽  
Low Cost ◽  
Consumer Products ◽  
Electronic Systems ◽  
Printed Wiring Board ◽  
Large Area ◽  
Active Devices ◽  
Materials Research ◽  
Wiring Board ◽  
Large Area Electronics

AbstractDevelopments originally targeted toward economical manufacturing of telecommunications products have planted the seeds for new opportunities such as low-cost, large-area electronics based on printing technologies. Organic-based materials systems for printed wiring board (PWB) construction have opened up unique opportunities for materials research in the fabrication of modular electronic systems.The realization of successful consumer products has been driven by materials developments that expand PWB functionality through embedded passive components, novel MEMS structures (e.g., meso-MEMS, in which the PWB-based structures are at the milliscale instead of the microscale), and microfluidics within the PWB. Furthermore, materials research is opening up a new world of printed electronics technology, where active devices are being realized through the convergence of printing technologies and microelectronics.

Drilled hole damage of small diameter drilling in printed wiring board

2001 ◽  
Vol 118 (1-3) ◽  
pp. 436-441 ◽  
Author(s):  
Eiichi Aoyama ◽  
Hiromich Nobe ◽  
Toshiki Hirogaki
Keyword(s):  
Small Diameter ◽  
Printed Wiring Board ◽  
Wiring Board

I nuovi scambi tra medici e pazienti: le parole della medicina

2021 ◽  
Vol 9788879169776 ◽  
pp. 35-45
Author(s):  
Antonio M. Carrassi
Keyword(s):  
Search Engines ◽  
Health Workers ◽  
Medical Knowledge ◽  
Medical Field ◽  
Average Life ◽  
Average Life Span ◽  
Research Activities ◽  
Field Information ◽  
The One ◽  
The Individual

Medicine showed enormous progresses since the middle of the last century and, thanks to the overwhelming research activities, which characterized that period, the average life span of people has increased extraordinarily. Many diseases that once were considered incurable are now being successfully treated. However, the disease has often been placed at the core of the clinical process rather than the person, the individual, the patient. Even in recent years, the patient doesn’t always find in his doctor the appropriate degree of empathy, and the level of communication that would be desirable. Moreover, today we are living an extraordinary development and spreading use of digital resources and search engines. Patients exploit these tools to obtain any kind of information, included the one in the medical field. Information technology and search engines play an extremely important role in medicine, and they can be seen a pivotal communication instrument between clinicians and patients, although they can also provide inaccurate or incorrect feedback to laypeople looking for answers to health questions, who do not have enough medical knowledge to evaluate the reliability of the source. This problem has been raised by clinicians and, more generally, by health workers, who today operate with a view to greater psychological proximity to the patient, passing from a so-called Disease Centred Medicine to a clinical practice much more sensitive to the needs of the patient, to his experience, to the context in which he lives, thus achieving a Patient Centred Medicine. Listening, attention, empathy and the words that a clinician is required to use towards each patient, during the clinical routine, take on more and more value for a correct doctor-patient exchange and alliance.

Amalaki as a Rasayan in Geriatric Diseases

2018 ◽  
Vol 6 (06) ◽  
Author(s):  
Naina Vishwakarma
Keyword(s):  
Quality Of Life ◽  
Life Span ◽  
Old Age ◽  
Natural Process ◽  
Healthy Ageing ◽  
Average Life ◽  
Average Life Span ◽  
Medical Facilities

Geriatric problems are arising much and more in the present Era. With the increase in average life-span due to medical facilities it resulted in large number of people with old age Worldwide. To overcome this Ayurved advocates healthy ageing through Rasayan Chikitsa. By proper administration of Rasayan Therapy as a preventive tool one can prevent Jarajanit(Geriatic) vyadhis. Many herbs and techniques which provide solution to ageing and their complications are described in Ayurved. The Herbs with their properties slows down the natural process of aging and help in managing geriatric problem and improving the quality of life. Here   Amalaki an Rasayan Dravya in Geriatric diseases is brought in focus.

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