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Ujjwal Das

As seen in: Nature, Journal of Automated Methods and Management in Chemistry, Taylor & Francis Online, ACS Publications, Royal Society of Chemistry, DEV Community
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Articles by Ujjwal Das

How to Create and Optimize robots.txt for Better SEO (2026 Guide)

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By Ujjwal Das
| DEV Community
A few years back I spent an entire afternoon debugging why a client's blog had stopped showing up in Google, only to find someone had left a stray line in their robots.txt file that blocked the whole site. It took thirty seconds to fix and about a week for the traffic to recover. That's the thing about robots.txt: it's one of the smallest files on your server, but it can quietly do a lot of damage if you're not paying attention to it. What Is robots.txt, Really?
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Association of parental death and separation with child mortality in India

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By Ujjwal Das, Sanjay K. Mohanty
| Nature Verified
Abstract Parental death and separation in early life can have profound effects on child health, increasing the risk of mortality. Using data from the fifth round of the National Family Health Survey (2019–21), this study examined the association of parental death and separation on mortality among children aged 0–59 months in India. A total of 232,577 children were included in the analysis, with infant and under-five mortality rates estimated using the life table technique.
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Feature selection in Cox model with partially observed covariates: Application to oncology trials

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By Ujjwal Das, Ranojoy Basu
| Taylor & Francis Online
Advanced search The American Statistician Latest Articles Submit an article Journal homepage Full Article Figures & data References Supplemental Citations Metrics Reprints & Permissions Read this article /doi/full/10.1080/00031305.2025.2606077?needAccess=true Accepted author version Abstract In many real-life experiments with human subjects, missing data are common. Multiple imputation is widely used to handle unobserved data points.
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Air-Induced Conductivity Loss in Fullerene ETLs Can Drive Charge Extraction Losses in Vapor-Deposited Perovskite Solar Cells

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By Raphael Richardson, Ujjwal Das, Austin G. Kuba, Chaiwarut Santiwipharat
| ACS Publications
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By Tapas Ghorui, Ujjwal Das, Sarsuna College, Basab Adhikari, Kausikisankar Pramanik
| Royal Society of Chemistry Verified
Correction: Iridium-mediated C–S bond activation and transformation: organoiridium(iii) thioether, thiolato, sulfinato and thiyl radical compounds.
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