المؤلفون: Alamgir, Mohammed¹ (AUTHOR), Mahapatra, Susanta¹ (AUTHOR) susanta.mahapatra@uohyd.ac.in

المصدر: Journal of Chemical Physics. 2/21/2024, Vol. 160 Issue 7, p1-16. 16p.

مصطلحات موضوعية: *PHOTODISSOCIATION, *TIME-dependent Schrodinger equations, *OPTIMAL control theory, *WAVE functions, *ULTRAVIOLET lasers, *LASER pulses, *SCHRODINGER equation, *PHOTOEXCITATION

مستخلص: The N–H photodissociation dynamics of the pyridinyl radical upon continuous excitation to the optically bright, first excited ππ* electronic state by an ultra-violet (UV) laser pulse has been investigated within the mathematical framework of optimal control theory. The genetic algorithm (GA) is employed as the optimization protocol. We considered a three-state and three-mode model Hamiltonian, which includes the reaction coordinate, R (a1 symmetry); the coupling coordinates (namely, out-of-plane bending coordinate of the hydrogen atom of azine group), Θ (b1 symmetry); and the wagging mode, Q9 (a2 symmetry). The three electronic states are the ground, ππ*, and πσ* states. The πσ* state crosses both the ground state and the ππ* state, and it is a repulsive state on which N–H dissociation occurs upon photoexcitation. Different vibrational wave functions along the coupling coordinates, Θ and Q9, of the ground electronic state are used as the initial condition for solving the time-dependent Schrödinger equation. The optimal UV laser pulse is designed by applying the GA, which maximizes the dissociation yield. We obtained over 95% dissociation yield through the πσ* asymptote using the optimal pulse of a time duration of ∼30 000 a.u. (∼725.66 fs). [ABSTRACT FROM AUTHOR]

المؤلفون: Engert, Jayden E., Campbell, Mason J., Cinner, Joshua E., Ishida, Yoko, Sloan, Sean, Supriatna, Jatna, Alamgir, Mohammed, Cislowski, Jaime, Laurance, William F.

المصدر: Nature; May2024, Vol. 629 Issue 8011, p370-375, 6p

مستخلص: Roads are expanding at the fastest pace in human history. This is the case especially in biodiversity-rich tropical nations, where roads can result in forest loss and fragmentation, wildfires, illicit land invasions and negative societal effects1–5. Many roads are being constructed illegally or informally and do not appear on any existing road map6–10; the toll of such ‘ghost roads’ on ecosystems is poorly understood. Here we use around 7,000 h of effort by trained volunteers to map ghost roads across the tropical Asia-Pacific region, sampling 1.42 million plots, each 1 km² in area. Our intensive sampling revealed a total of 1.37 million km of roads in our plots—from 3.0 to 6.6 times more roads than were found in leading datasets of roads globally. Across our study area, road building almost always preceded local forest loss, and road density was by far the strongest correlate11 of deforestation out of 38 potential biophysical and socioeconomic covariates. The relationship between road density and forest loss was nonlinear, with deforestation peaking soon after roads penetrate a landscape and then declining as roads multiply and remaining accessible forests largely disappear. Notably, after controlling for lower road density inside protected areas, we found that protected areas had only modest additional effects on preventing forest loss, implying that their most vital conservation function is limiting roads and road-related environmental disruption. Collectively, our findings suggest that burgeoning, poorly studied ghost roads are among the gravest of all direct threats to tropical forests.An effort to map roads in the Asia-Pacific region finds that there are 3.0–6.6 times more roads than other sources suggest, and that unmapped ‘ghost roads’ are a major contributor to tropical forest loss. [ABSTRACT FROM AUTHOR]

: Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Chowdhury, Md Maruf Hossan, Mahmud, A.K.M. Shakil, Banik, Shanta, Rabbanee, Fazlul K., Quaddus, Mohammed, Alamgir, Mohammed

المصدر: Asia Pacific Journal of Marketing & Logistics; 2024, Vol. 36 Issue 2, p408-434, 27p

مستخلص: Purpose: Drawing on the dynamic capability view (DCV), this research determines the suitable configurations of resilience strategies for sustainable tourism supply chain performance amidst "extreme" disruptive events affecting the entire supply chain. Design/methodology/approach: This research applies a multi-study and multi-method approach. Study 1 utilizes in-depth interviews to identify a list of tourism supply chain sustainability risks and resilience strategies. Study 2, using quality function deployment (QFD) technique, determines the most important resilience strategies corresponding to highly significant risks. Study 3, on the other hand, adopts a fuzzy set qualitative comparative analysis (fsQCA) to determine the best recipe of resilience strategies and risks to make the tourism supply chain performance sustainable. Findings: The findings reveal that sustainable tourism performance during an extreme disruptive event (e.g. COVID-19 health crisis) depends on the combined effect of tourism resilience strategies and risks instead of their individual effect. Practical implications: The research findings offer significant managerial implications. Managers may experiment with multiple causal conditions of risks and resilience strategies to engender the expected outcome. Originality/value: This research extends current knowledge on tourism supply chain and offers insights for managers to mitigate the risks and ensures sustainable performance in the context of extreme disruptive events. [ABSTRACT FROM AUTHOR]

: Copyright of Asia Pacific Journal of Marketing & Logistics is the property of Emerald Publishing Limited and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Hossain, Md Moazzem, Alam, Manzurul, Alamgir, Mohammed, Salat, Amirus

المصدر: Education + Training, 2020, Vol. 62, Issue 3, pp. 292-310.

الوصول الحر: http://www.emeraldinsight.com/doi/10.1108/ET-12-2018-0258Test

المؤلفون: Alamgir, Mohammed

مصطلحات موضوعية: 290000 Engineering and Technology, School of Electrical Engineering

الوصف: The use of multiple antennas at the transmitter as well as at the receiver can greatly improve the capacity of a wireless link when operating in a rich scattering environment. In such an arrangement all transmitting antennas radiate in the same frequency band so the overall spectral efciency becomes very high. Such a multiple antenna scheme, popularly known as Multiple Input Multiple Output (MIMO) has potential application in wireless local area networks (WLAN) and cellular micro-cells. One reason is that the WLANs and other short range wireless systems often operate in an indoor environment, which offers rich scattering. The other reason is the demand for higher data rates in cellular and WLAN systems to cater for multimedia services. Recently researchers have proposed di erent architectures for materializing the potential of the MIMO scheme. VBLAST (Vertical-Bell Labs Space Time) is a popular architecture that will play an important role in future standardizations. Furthermore, different decoding methods have been proposed for VBLAST. The SVD (Singular Value Decomposition) based system is envisioned as a highly effective MIMO technique in a TDD (Time Division Duplex) framework. Such a system operates by adapting the constellation size across different subchannels. In this work we study the VBLAST and SVD architectures and compare the perfor- mance and computing power requirement of these architectures. Also in this study a new effcient decoding method for the VBLAST architecture is proposed. The original VBLAST decoding method relies on the repetitive computation of the pseudoinverse of the channel matrix. Alternatively, there are methods based on the QR decomposi- tion, the matrix square root etc. Our new decoding method is based on a relatively less known matrix decomposition, the Polar Decomposition. The new method requires less computation and has several other advantages like the possibility of incremental updates, channel rank tracking, etc. We consider three different types of channels: IID random, slow fading and measured channels. The entire work is simulated in the MATLAB environment. The main contribution of this work includes: a comparative study and a head to head comparison of the VBLAST and SVD-based MIMO systems. The application of adaptive modulation in the SVD-based system and the introduction of a new effcient decoding method for the VBLAST system are also included. Simulation results are reported with comments and conclusions.

الإتاحة: http://eprints.vu.edu.au/268/1/02whole.pdfTest

المؤلفون: RIPPLE, WILLIAM J., WOLF, CHRISTOPHER, GALETTI, MAURO, NEWSOME, THOMAS M., GREEN, TOM L., ALAMGIR, MOHAMMED, CRIST, EILEEN, MAHMOUD, MAHMOUD I., LAURANCE, WILLIAM F.

المصدر: BioScience, 2018 Apr 01. 68(4), 239-240.

الوصول الحر: https://www.jstor.org/stable/90020362Test

المؤلفون: 15,364 scientist signatories from 184 countries, RIPPLE, WILLIAM J., WOLF, CHRISTOPHER, NEWSOME, THOMAS M., GALETTI, MAURO, ALAMGIR, MOHAMMED, CRIST, EILEEN, MAHMOUD, MAHMOUD I., LAURANCE, WILLIAM F.

المصدر: BioScience, 2017 Dec 01. 67(12), 1026-1028.

الوصول الحر: https://www.jstor.org/stable/90016214Test

المؤلفون: Chowdhury, Imtiaz Uddin, Alamgir, Mohammed

المصدر: Society & Sustainability; Vol. 3 No. 2 (2021): Society & Sustainability; 1-15 ; 2690-6767 ; 10.38157/society_sustainability.v3i2

مصطلحات موضوعية: Environmental Concern, Willingness to Pay, Moral Obligation, Green Products, Purchase Intention, Young Consumers

الوصف: The present study aims to determine critical factors affecting the green product purchase intention of Bangladeshi young consumers. In order to investigate the relationship, a formal questionnaire survey has been conducted targeting young Bangladeshi consumers, aged between 18 and 32 years old. A total of 400 responses have been finally screened out for analysis. Data analysis was carried out through partial least square structural equation modeling (PLS-SEM). The findings show that young consumers’ green purchase intention (GPI) is largely determined by their attitude, environmental concern (EC), and willingness to pay (WTP). However, the impact of perceived moral obligation (PMO), on green purchase intention has been found insignificant. The study leaves specific implications for the strategic marketing decision-makers who strive to promote green product consumption in Bangladesh.

وصف الملف: application/pdf

العلاقة: https://riiopenjournals.com/index.php/society_sustainability/article/view/291/114Test; https://riiopenjournals.com/index.php/society_sustainability/article/view/291Test

الإتاحة: https://doi.org/10.38157/society_sustainability.v3i2.291Test
https://doi.org/10.38157/society_sustainability.v3i2Test
https://riiopenjournals.com/index.php/society_sustainability/article/view/291Test

المؤلفون: Mondal, Suman, Behera, Smruti Prangya, Alamgir, Mohammed, Baskar, Viswanathan

المساهمون: University Grants Commission, Council for Scientific and Industrial Research

المصدر: ACS Omega ; volume 7, issue 1, page 1090-1099 ; ISSN 2470-1343 2470-1343

مصطلحات موضوعية: General Chemical Engineering, General Chemistry

الإتاحة: https://doi.org/10.1021/acsomega.1c05673Test

المؤلفون: Alamgir, Mohammed, Campbell, Mason J., Sloan, Sean, Engert, Jayden, Word, Jettie, Laurance, William F.

الوصف: The forests of Borneo—the third largest island on the planet—sustain some of the highest biodiversity and carbon storage in the world. The forests also provide vital ecosystem services and livelihood support for millions of people in the region, including many indigenous communities. The Pan-Borneo Highway and several hydroelectric dams are planned or already under construction in Sarawak, a Malaysian state comprising part of the Borneo. This development seeks to enhance economic growth and regional connectivity, support community access to services, and promote industrial development. However, the implications of the development of highway and dams for forest integrity, biodiversity and ecosystem services remained largely unreported. We assessed these development projects using fine-scale biophysical and environmental data and found several environmental and socioeconomic risks associated with the projects. The highway and hydroelectric dam projects will impact 32 protected areas including numerous key habitats of threatened species such as the proboscis monkey (Nasalis larvatus), Sarawak surili (Presbytis chrysomelas), Bornean orangutans (Pongo pygmaeus) and tufted ground squirrel (Rheithrosciurus macrotis). Under its slated development trajectory, the local and trans-national forest connectivity between Malaysian Borneo and Indonesian Borneo would also be substantially diminished. Nearly ~161 km of the Pan-Borneo Highway in Sarawak will traverse forested landscapes and ~55 km will traverse carbon-rich peatlands. The 13 hydroelectric dam projects will collectively impact ~1.7 million ha of forest in Sarawak. The consequences of planned highway and hydroelectric dams construction will increase the carbon footprint of development in the region. Moreover, many new road segments and hydroelectric dams would be built on steep slopes in high-rainfall zones and forested areas, increasing both construction and ongoing maintenance costs. The projects would also alter livelihood activities of downstream communities, ...

وصف الملف: application/pdf

العلاقة: https://doi.org/10.1371/journal.pone.0229614Test; https://researchonline.jcu.edu.au/62447Test/; https://researchonline.jcu.edu.au/62447/1Test/Alamgir%20et%20al.%20%282020%29-Sarawak-development.pdf; Alamgir, Mohammed, Campbell, Mason J., Sloan, Sean, Engert, Jayden, Word, Jettie, and Laurance, William F. (2020) Emerging challenges for sustainable development and forest conservation in Sarawak, Borneo. PLoS ONE, 15 (3). e0229614.

الإتاحة: https://doi.org/10.1371/journal.pone.0229614Test
https://researchonline.jcu.edu.au/62447/1Test/Alamgir%20et%20al.%20%282020%29-Sarawak-development.pdf