
Shikha WadhwaUniversity of Petroleum and Energy Studies | UPES · Department of Chemistry
Shikha Wadhwa
MSc (Organic Chemistry); MTech (Nanotechnology); PhD
About
84
Publications
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Introduction
My research interests include photocatalytic degradation of organics towards water purification, removal of contaminants from water, detection of bio-analytes using nanostructures and advanced materials and nanostructures as substrates for cell growth & proliferation
Skills and Expertise
Additional affiliations
September 2012 - October 2014
Knowledge Advisory Services & Consultancy
Position
- Research Associate
August 2011 - December 2012
Publications
Publications (84)
Indiscriminate use of oxytetracycline is linked to the development of antibiotic-resistant genes, posing a serious threat to human health and ecosystem balance. This article reports the adsorptive elimination of oxytetracycline (OTC) from aqueous solution using a newly developed MnO2-modified pine-cone biochar (MnO2/PCBC). The MnO2/PCBC was charact...
Contaminants of Emerging Concerns (CECs) are a new class of pollutants that may raise environmental and human risks. Such contaminants are prevalent in the environment as they can’t be easily eliminated completely by traditional processing of wastewater discharge due to their obstinate nature. Adsorption is one such technique that is efficient, str...
Paper-based microfluidic devices have emerged as a promising technology for a variety of applications, including diagnostics, chemical synthesis, and environmental monitoring. These devices are inexpensive, portable, and easy to use, making them suitable for use in resource-limited settings. The chapter aims to highlight recent advances in the fiel...
Rapid urbanization is one of the key factors that leads to defragmentation and the shrinking of agricultural land. It further leads to the generation of an ample amount of municipal waste. Several technologies have emerged in the past for its utilization, and in this regard, composting is one of the conventional approaches gaining popularity in mod...
The virus known as Japanese Encephalitis (JEV) is among the common viral persisting Encephalitis caused by Flavivirus around the Globe, especially in Southeast Asian nations. JEV may be a leading reason for neurological illness in humans, with an estimated 70,000 human cases and 10,000 fatalities per annum. The conventional methods like PRNT (Plaqu...
Forward osmosis (FO) technology has been acknowledged as an energy-efficient cutting-edge water treatment innovation; however, the inefficient performance of polymer-based membranes remains a tailback in the practical utilization of FO. A significant issue in FO is membrane fouling, which negatively influences the flux efficiency, working expenses...
Forward osmosis (FO) is the futuristic membrane desalination technology as it transcends the disadvantages of other pressure-driven techniques. But, there still remain critical challenges like fabrication of highly permeable membrane with ideal structures maintaining high rejection rates that need to be addressed for implementation as a practical t...
Low access to electricity is a significant problem in small and distant areas, where power intensive treatment systems like reverse osmosis can complicate handling requirements. In order to mitigate the energy requirements in such areas, forward osmosis (FO) is an advance option to desalinate and provide potable water cost effectively. In this stud...
The nano-particles of hematite (α-Fe2O3) has so many different properties like magnetism, hydrophilic, non-toxic, high chemical stability, chemical and biological compatibility and high potential in applications of environmental remediation. In this paper, we report the simple, promising, improved synthesis of hematite/alginate nanocomposites and c...
This paper highlights the changes in micro-structural and field emission properties of vertically aligned carbon nanotubes (VACNTs) via oxygen plasma treatment. We find that exposure of very low power oxygen plasma (6 W) at 13.56 MHz for 15-20 min, opens the tip of vertically aligned CNTs. Scanning electron microscopy and transmission electron micr...
Different shapes and sizes of multiwalled carbon nanotubes (MWCNTs) were prepared by the thermal chemical vapor deposition (CVD) process using ferrocene and toluene on conducting (cobalt/silicon), semiconducting (silicon) and insulating (quartz) substrates to investigate the change in surface morphology, microstructure and electron field emission p...
The aim of this study is to assess in vitro cytotoxic effects of titania nanostructures and carbon nanotubes (CNTs) by exposing A549 lung epithelial cell line to these materials. Titania nanotubes (TiNTs) were grown by hydrothermal treatment of TiO(2) nanoparticles, followed by annealing them at 400°C. The titania nanostructures obtained on anneali...
Heterogeneous photocatalysis has been reported to be effective for the degradation of a wide range of organic pollutants and the inactivation of pathogens in water. The use of nanostructured materials is one approach to improving photocatalytic efficiency. Titanate nanotubes were prepared by a hydrothermal synthesis and annealing yielded titania na...
Enterprises require to embrace multiple initiatives simultaneously for sustainable Supply Chain (SC) agility. Analysis of complex systems like the industrial SC is difficult because of complexity and mathematical intractability and simulation is one of the available option for study. We present a building block approach for the development of a mul...
The faster parts, information and decisions flow through supply chains, the faster they can respond to customer needs and to the demands of the market. In the last decade, interest has been focused on the volatile market conditions and thus, the issue of demand information sharing is paid much attention. The principal objective of this study is to...
As a result of rapid progress in technology and the shrinking product lifecycles faster than ever before, has led creeping realization of additional profits by performing the effective and efficient product recovery operations at a world-class level quintessential. Realization of these motives is complex due to the multidimensional relationships as...
A typical Flexible Manufacturing System (FMS) has been studied under Planning Design and Control (PDC) strategies. The chief objective is to test the impact of design strategy (routing flexibility) on system performance under planning strategy (alternate system load condition) with control strategies (sequencing and dispatching rules). A computer s...
This paper attempts to study the impact of impulsive demand disturbances on the inventory-based performance of some inventory control policies. The supply chain is modelled as a network of autonomous supply chain nodes. The customer places a constant demand except for a brief period of sudden and steep change in demand (called demand impulse). Unde...
This paper is aimed at providing a broad review of the main approaches to supplier-related issues especially supplier selection, supplier–buyer relationships, supplier–buyer flexibility in relationships in a dynamic supply chain, through the description of the main characteristics, techniques, ongoing developments and research activities. Also, the...
Surface modification of the carbon nanotubes is important for their application in various fields. In this study, multiwalled carbon nanotubes (MWCNTs) were grown on cobalt catalyst layer (3 nm thickness) sputtered on a silicon substrate using Microwave Plasma Enhanced Chemical Vapor Deposition (MPECVD) system. The as-grown MWCNT layer was found to...
The most favorable reverse manufacturing alternative arriving to collection centers has always been a key strategic consideration of any product recovery system. The nature of these decisions usually is considered to be multidimensional, interdisciplinary, complex, and unstructured due to lack of certainty in environment and information regarding t...
In a supply chain, the suppliers’ flexibility is considered as a tool to cope with the environmental uncertainties. Flexible suppliers are capable of supplying/processing other jobs in addition to the one for which they are the original supplier. In a cluster of flexible suppliers, it is expected that flexibility of suppliers be utilized more expre...
In this paper, a framework for an object-oriented Supply Chain (SC) environment is proposed. This framework is based on object-oriented methodology, which allows the building of complex simulation models by combining some basic or primitive objects. This proposed framework provides several advantages over existing SC systems. First of all, this sys...
Virtual manufacturing is a dynamic enterprise structure that will enable future competitiveness in the fast changing business environment. This is made possible through quick IT based integration of flexible and core competent business entities capable of providing value-added product and services. Flexibility elements represent change capabilities...
This article is aimed at providing a broad review of the main approaches to information related issues in a dynamic supply chain, through the description of the main characteristics, techniques, ongoing developments and research activities. The literature is examined from the perspective of the existing information systems that support supply chain...
Supply chains are increasingly needed to work with core competencies of a flexible system enriched with Knowledge Management (KM). An integrated decision making amongst autonomous chain partners focused on suitable knowledge sharing is required to derive superior operational performance from flexibility based core competency in supply chains. Evolv...
A typical Flexible Manufacturing System (FMS) has been studied under Planning, Design and Control (PDC) strategies. The chief objective is to test the impact of design strategy (routing flexibility) on system performance under given planning strategy (alternate system load condition) and control strategies (sequencing and dispatching rules). A comp...
Purpose
Performance evaluation in supply chain management (SCM) is not a straightforward task. This becomes even more complicated while evaluating a process industry supply chain because of its inherently different characteristics. The purpose of this paper is to suggest a method to evaluate the performance of one such process supply chain, namely...
Direct sales channels, environmental legislation, and liberal returns policies have contributed to the growth of returns flows. However, there is still a lot of research required to enrich the domain by modeling a decision framework and developing an integrated architecture for product return as an enterprise system. Most of the available literatur...
This research is motivated by the co-operative production process of networked manufacturing systems (NMS). Manufacturing resource sharing and flexible production scheduling are two features of NMS. For an individual manufacturing system in an NMS, ‘flexible production scheduling’ means that it can produce multiple product-types and the switching o...
Effective Supply Chain Management (SCM) is a pivotal issue in the dynamically changing business environment. Dynamic SCM requires integrated decision-making amongst autonomous chain partners with effective decision information synchronization amongst them. By exploiting flexibility in supply chain structures, better performance can be achieved. Sim...
The flexibility of a flexible manufacturing system (FMS) has provided it with the capability to become one of the most suitable manufacturing systems in the present manufacturing environment of customized and an increasing variety of products with shorter life cycles. Significant research has been made on flexibility from different points of views....
The key part of dynamic supply chain management is negotiating with suppliers and with buyers. Designing efficient business processes throughout the supply chain, and controlling their speed, tim-ing, and interaction with one another, is decisive factors in a competitive and dynamic environment. Coordination is essential for successful supply chain...
Agility can be viewed as a need to encourage the enterprise-wide integration of flexible and core competent resources so as to offer
value-added product and services in a volatile competitive environment. Since flexibility is considered a property that provides change capabilities of different enterprise-wide resources and processes in time and
cos...
Due to recent changing environmental requirements affecting supply chain operations. Managing product returns has received wide spread attention from both practitioner and academicians. This paper investigates the sustainable approaches leading to the development of an integrated flexible reverse logistics system. In order to develop sustainable pr...
Purpose
– The purpose of this paper is to describe research which compared quality awards and the selection of criteria for assessing health care processes quality status, in private sector health care institutions in India.
Design/methodology/approach
– A comparison of quality awards was performed and criteria were selected for assessing health c...
Supply chain excellence has a real impact on business strategy. Building supply chains as flexible systems represents one of the most exciting opportunities to create value and one of the most challenging tasks for the policy makers. It requires integrated decision making amongst autonomous chain partners with effective decision knowledge sharing b...
Based on the rapid technical development in the last decade, the automation in many areas of production and distribution has developed significantly. This leads to complex situations where decisions have to be taken within a short time and among several alternatives - often without the human intervention. This paper considers flexible system as a m...
In this article, a novel Negotiation-to-Coordinate (N2C) mechanism is proposed to explore the interactive nature of the buyer-supplier relationships for dynamic environments. The proposed N2C mechanism uses prioritized fuzzy constraints to represent trade-offs among the different probable values associated with the negotiation issues and to signify...
Flexibility of flexible manufacturing systems (FMSs) has been considered as an effective tool to compete in the present manufacturing environment. Enormous research efforts have been made to harness the benefits of flexibility through superior control strategies. While modeling flexibility and control strategies, researchers have mostly assumed an...
Owing to ill-structured, dynamic environments and the presence of multiple decision-makers with conflicting viewpoints, comprehension, analysis and support of the supplier evaluation process becomes more and more difficult. Moreover, with the complexities of issues such as the role of leadership, the influence of group formation, and analysis of di...
In present manufacturing environment, the manufacturing flexibility has become one of the strategic competitive tools. Flexibility refers to the availability of alternative resources. These resources may have varied parameters, particularly related to physical and operating system. These physical and operating parameters of alternative resources ma...
The evolving paradigm shift resulting from IT, social and technological changes has created a need for developing an innovative knowledge-based healthcare system, which can effectively meet global healthcare system demands and also cater to future trends. The Hospital Information Management System (HIMS) is developed with this sole aim in mind, whi...
There are tremendous benefits to view a healthcare system as a flexible system. It helps to promote innovations towards greater quality of service as well as better utilization of the resources. Healthcare System (HCS) in India needs to promote improved customer services, greater collaborations within Health System, improved HCS system designs, re-...
Globally, automotive manufacturers are faced with the challenges of expanding product variety and high customer service provision.
They increasingly face a flexibility driven, time-based competition. This demands effective knowledge management to develop
more effective processes. In other words, there is a need for knowledge-driven innovations that...
This paper presents the results of a conceptual study and simulation experimentation aimed at understanding the impact of
three important types of flexibility on the lead-time performance of a manufacturing system. The three flexibility types,
viz. transformation flexibility, sequencing flexibility and product flexibility have been identified based...
Purpose
When a supply chain initiative is taken up by a firm a number of issues come up during implementation. The purpose of this paper is to identify some of the major issues related to such implementation and draw out practices from literature to serve as remedies for these issues.
Design/methodology/approach
The paper starts by suggesting a br...
Building supply chains as flexible system represents one of the most exciting opportunities to create value. This requires integrated decision making amongst autonomous chain partners with effective decision knowledge sharing between them. For any decision process, one of the main inputs required is the available knowledge. Hence, it is important t...
In time-based performances of a manufacturing system, flexibility has played a pivotal role. Significant research efforts have been made from defining the various types of flexibility in flexible manufacturing systems (FMS) to the performance measurement index of flexibility levels. This paper focuses on the physical and operating characteristics o...
Purpose
To demonstrate how postponement strategy can be applied in an automotive company by using business process redesign in the knowledge innovation context.
Design/methodology/approach
A demonstrative case was developed using simulation of alternative scenarios of cycle service levels (CSL) and product flexibility, etc. to determine the value...
Technical Education System (TES) is a growing field that is bringing a paradigm shift in new future directives. To strengthen TES there is a need to effectively assess various institutes. The identification of strongest and weakest functions is important to impart quality education and hence achieve higher standards. This paper presents the Data En...
This paper proposes a generic modelling and analysis approach to integrate and capture all process-related information for complex dynamics and distributed supply chains. Two configurations viz. the make-to-stock (MTS) and the assemble-to-order (ATO) are analysed by a novel High Intelligent Time (HIT) petri net. It serves as both an inference model...
The Knowledge Management (KM) driven dynamic supply chain holds future competitive potential for improved business performance. Dynamic supply chains can change their structures and chain partners dynamically. Hence, they are more complex to deal with, especially for the Small and Medium Sized Enterprises (SMEs). Global chains can have SMEs as mult...
Organisations have realised that service is having an important contribution to financial performance and customer satisfaction. In recent years, technical education and healthcare have been treated as business organisations and this paper compares the similarities and dissimilarities between these two broad service sectors. The idea of coupling th...
Collaborations in supply chains as a business strategy is now getting increasing attention at business leadership level. In most cases, collaboration appears to imply vertical integration on both ends of the supply chain, that is, collaboration with suppliers and dealers/ retailers. Although horizontal collaboration (that is, between supply chains)...
In the era of fierce competition Supply Chain Management (SCM) has gained enormous amount of importance. A major decision that affects the overall performance of a supply chain is the modeling of the supply chain. Some of the widely used supply chain modeling tools are reviewed in this paper. A case for agent-based architecture for modeling of supp...
This paper presents the results of a conceptual study and simulation experimentation aimed at understanding the underlying mechanisms of sequencing flexibility-enabled manufacturing lead-time reduction. In spite of a large body of literature on flexibility, the exact mechanism that enables flexibility to reduce the lead time is not fully understood...
This paper develops a hybrid genetic algorithm for production and distribution problems in multi-factory supply chain models. Supply chain problems usually may involve multi-criterion decision-making, for example operating cost, service level, resources utilization, etc. These criteria are numerous and interrelated. To organize them, analytic hiera...
Manufacturing systems with varying levels and types of flexibility employ alternative scheduling strategies to exploit flexibility
for performance enhancement. Scheduling decisions in manufacturing systems are influenced by time delays due to information
handling activities such as information collection, transfer, and processing. More specifically...
Although information plays a major role in effective functioning of supply chain networks (SCNs), studies that deal specifically
with the dynamics of supply chains are few. This problem is relatively new since fast communications and the means to employ
it for effective management of supply chains did not exist till recently. In order to provide a...
Practitioners and academicians throughout the world recognize the crucial role played by flexibility within manufacturing
organizations, especially those engaged in small batch manufacture. However, although the concept of flexibility has begun
to attract increased attention, its interaction with information integration and automation has not captu...
Companies have already begun to realize the importance of internal operations and the knowledge driven environment within a company. The effectiveness to contribute towards new knowledge useful for the company, that is, innovation by an employee is dependent on his/her perception of the organization. Using data obtained from an Indian software comp...
The present industrial era can be characterized as knowledge based competitive era. Knowledge Management (KM) is an effective approach used by world-class organizations. One of the key challenges involves effective supply chain management under a globalization context. Global supply chains are more complex and involve multiple autonomous players wi...
In industrial practice, a firm may simultaneously offer for sale a number of diverse products. In particular, different products in the portfolio may be offered for sale for different lengths of time, ranging from short (e.g., fashion products) to long (e.g., commodity products). Further, at any point in time, different products may be at different...
This paper presents the results of a conceptual study and simulation experimentation aimed at understanding the impact of Decision-Information Synchronization (DIS) in Flexible Systems. The study shows that the flexibility enabled lead-time reduction in flexible systems is influenced by DIS of various types in various ways. It is thus important to...
Modern manufacturing enterprises must collaborate with a large number of suppliers to design and produce their products. Management of these supply chains is crucial. The trend in supply chain and demand management today is towards taking action in real time based on the information access across the network. Harnessing computer advances to make mo...
This paper studies vertical and horizontal supply chain collaboration, and proposes a demand sharing methodology based on a set of predefined collaboration rules. Supply chain collaboration is prevalent, and has been recognized to be one of the important issues in improving competition strength. However, implementation of supply chain collaboration...
Online control strategies employed in the manufacturing systems
involve decisions that may entail significant time delays depending on
the level of computerization in the shop floor. We refer to these delays
as decision delays when they cause delays in decision processing and
implementation. In the domain of discrete part manufacturing systems
with...
The role of on-line control strategies is crucial for exploiting the flexibility within discrete part manufacturing systems. When studying their impact on system performance, researchers have mostly assumed the presence of real-time information availability. Such assumption may not always be valid in real world manufacturing situations since on-lin...
The evolving manufacturing environment is characterized by a drive toward increasing flexibility. One possible manifestation of flexibility within an FMS is in the form of routing flexibility. Providing this typically is an expensive proposition, and system designers therefore aim to provide only the required levels commensurate with a given set of...
The planning of supply for fashion products, seasonal products and technologically innovative products presents certain similar challenges. These products are characterized by high demand uncertainty and require responsive supply chains to effectively match supply to demand. Further, for such products, it is useful to explicitly model how forecast...