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Removal of hexavalent chromium by an aromatic alcohol

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Journal of Biomedical Science and Engineering 2010年第7期3卷 735-741页

作者： Ankita Basu Rumpa saha Jayashree Mandal Sumanta Ghosh bidyut saha 不详

Cr(VI) is a widespread environmental contaminant and a known human carcinogen. Biosorption is a very common method to remove toxic Cr(VI) from industrial waste water. In biosorption Cr(VI) is reduced to less toxic Cr(III) and adsorbed in biosorbent as Cr(III). Effective biosorbents contain hydroxy groups;it may be aliphatic or aromatic. Kinetics of reduction of Cr(VI) by an aromatic alcohol, benzyl alcohol, (which is an important volatile component of flowers of some night blooming plants) in micellar media have been studied spectrophotometrically. Micellar media is a probe to establish the mechanistic paths of reduction of Cr(VI) to Cr(III). Effects of electrolytes are studied to support the proposed reaction mechanism. Suitable surfactant & suitable concentration of electrolyte enhance the biosorption property.

关键词： Biosorption Carcinogen Kinetics Chromium (VI) Benzyl Alcohol Non Functional Surfactants Salt Effect

Experimental and Theoretical Analysis of the Impinging Stream Drying

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Chinese Journal of Chemical Engineering 2003年第1期11卷 42-48页

作者：淮秀兰刘登瀛 SHIGERUKoyama Instituteof Engineering Thermophysics Chinese Academy of Sciences Instituteof Advanced Material Study Kyushu University

The experiments of one-stage semi-circular and two-stage semi-circular impinging stream drying as well as the vertical and semi-circular combined impinging stream drying were carried out. The velocity distribution and the mean residence time of particles, and the influence of various factors on drying characteristics were studied. A mathematical model of granular material drying in a semi-circular impinging stream dryer was proposed, in which the flow characteristics as well as the heat and mass transfer mechanisms were considered. Reasonable numerical methods were used to solve the equations. Under various conditions, the calculated results agree well with the experimental data. The unsteady-state drying dynamic equation, as well as the variations of drying rate and moisture content versus time were obtained. The results indicate that constant drying rate period does not exist in a semi-circular impinging stream dryer. Appropriate semi-circular stage number and curvature radius, flow-rate ratio, air velocity, and higher inlet air temperature should be used for enhancing the drying process.

关键词： impinging stream drying flow characteristics drying characteristics mathematical model

Constraints of Adsorption Cooling Cycles Working at Partial Vacuum and Pressurized Conditions

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Constraints of Adsorption Cooling Cycles Working at Partial ...

2008国际低温与制冷大会

作者： bidyut Baran saha Ibrahim I El-sharkawy Anutosh Chakraborty Shigeru Koyama Interdisciplinary Graduate School of Engineering Sciences Kyushu University

＜正＞The objective of this paper is to consolidate the outcomes of a systematic investigation on the use of adsorption phenomenon for *** performance analysis of thermally driven adsorption cooling cycles working in both partial vacuum and pressurized conditions is *** adsorbent and refrigerant pairs namely the activated carbon fiber ACF（A-20）/ethanol,MaxsorbⅢ/ethanol, silica gel/water,Fluka/R134a,Chemviron/R134a and MaxsorbⅡ/R134a pairs have been investigated. The relationships between equilibrium pressures,adsorbent temperatures and equilibrium adsorption concentrations（P-T-W diagram） have been *** analysis shows that the former three pairs,*** adsorption cycles working at partial vacuum pressures are suitable for surface cooling while latter three,*** working at pressurized conditions are suitable for micro cooling applications.

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天然表面活性剂(续完)

日用化学品科学 2017年第6期40卷 5-7,39页

作者：肖进新(译) Sourav De Susanta Malik Aniruddha Ghosh Rumpa saha bidyut saha 北京氟乐邦表面活性剂技术研究所北京100096 不详

11成本分析在建设和运作工厂之前,工艺的设计和经济评估是很重要的,这需要结合工程学的知识[66]。总体成本分析包括评估资本和运营开支。基于由Superpro Designer模拟软件开发的工艺经济模型,由葡萄糖和高油酸的葵花籽油生产907 00 t的... 详细信息

11成本分析在建设和运作工厂之前,工艺的设计和经济评估是很重要的,这需要结合工程学的知识[66]。总体成本分析包括评估资本和运营开支。基于由Superpro Designer模拟软件开发的工艺经济模型,由葡萄糖和高油酸的葵花籽油生产907 00 t的槐糖脂的年运营成本为2.68亿美元,单位生产成本每千克2.95美元。

关键词：天然表面活性剂 Designer 成本分析经济评估运营成本生产成本经济模型软件开发

A deep-reinforcement learning approach for optimizing homogeneous droplet routing in digital microfluidic biochips

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Nanotechnology and Precision Engineering 2023年第2期6卷 1-12页

作者： Basudev saha bidyut Das Mukta Majumder Department of Computer Science and Technology University of North BengalDarjeeling 734013India Department of Information Technology Haldia Institute of TechnologyHaldia 721657India

Over the past two decades,digital microfluidic biochips have been in much demand for safety-critical and biomedical applications and increasingly important in point-of-care analysis,drug discovery,and immunoassays,among other ***,for complex bioassays,finding routes for the transportation of droplets in an electrowetting-on-dielectric digital biochip while maintaining their discreteness is a challenging *** this study,we propose a deep reinforcement learning-based droplet routing technique for digital microfluidic *** technique is implemented on a distributed architecture to optimize the possible paths for predefined source–target pairs of *** actors of the technique calculate the possible routes of the source–target pairs and store the experience in a replay buffer,and the learner fetches the experiences and updates the routing *** proposed algorithm was applied to benchmark suitesⅠand Ⅲ as two different test benches,and it achieved significant improvements over state-of-the-art techniques.

关键词： Digital microfluidics Biochip Droplet routing Fluidic constraints Deep learning Reinforcement learning

GIS-based assessment of non-equilibrium pattern between groundwater recharge and irrigation draft in a semi-arid region of Rajasthan, India

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Journal of Arid Land 2016年第2期8卷 184-196页

作者： bidyut K BHADRA Sanjay KUMAR Rakesh PALIWAL Regional Remote Sensing Centre National Remote Sensing Centre Indian Space Research Organisation Department of Space Jodhpur Rajasthan 342003 India Krishi Vigyan Kendra Central Arid Zone Research Institute Indian Council of Agricultural Research Bhuj Gujarat 370105 India

Over-exploitation of groundwater for irrigation can result in drastic reduction in groundwater level in Jodhpur district of western Rajasthan, India. In this study, we used the long-term trend analysis of seasonal groundwater level data to predict the future groundwater scenario in 33 villages of Jodhpur district, assessed the impact of water harvesting structures on groundwater recharge and explored the non-equilibrium between groundwater recharge and irrigation draft in the study area. Analysis of groundwater level data from 26 observation wells in 33 villages in the pre-monsoon period showed that groundwater level decreased continuously at the rate of 2.07 m/a. With this declining rate, most of the tube wells （including the well with the maximum depth of 193 m） are predicted to become completely dry by 2050. Behavior of temporal groundwater level data in the study period （from 2004 to 2012） can be explained by different geospatial maps, prepared using ArcGIS software. Statistical analysis of the interpolated maps showed that the area with the maximum positive groundwater recharge occupied 63.14% of the total area during 2010-2011 and the area with the maximum irrigation draft accounted for 56.21% of the total area during 2011-2012. Higher groundwater recharge is attributed to the increase in rainfall and the better aquifer condition. Spatial distribution for the changes of average groundwater recharge and draft （2008-2009 and 2011-2012） showed that 68.50% recharge area was in positive change and 45.75% draft area was in negative change. It was observed that the area of the irrigation draft exceeded that of the groundwater recharge in most of the years. In spite of the construction of several shallow water harvesting structures in 2009-2010, sandstone aquifer zones showed meager impact on groundwater recharge. The best-fit line for the deviation between average groundwater fluctuation due to recharge and irrigation draft with time can be represented by the polynom

关键词： geographic information system groundwater fluctuation water harvesting structures Jodhpur district

Suppression of a spontaneous dust density wave by modulation of ion streaming

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Plasma Science and Technology 2020年第4期22卷 40-47页

作者： Tonuj DEKA bidyut CHUTIA Y BAILUNG S K SHARMA H BAILUNG Physical Sciences Division Institute of Advanced Study in Science and Technology(IASST)Paschim BoragaonGarchukGuwahatiAssam 781035India

Synchronization of a self-excited dust density wave has been experimentally investigated in a strongly coupled dusty plasma.A dust density wave of frequency^78 Hz is spontaneously generated from the dust void boundary due to the ion streaming *** electric field in the dust void region is measured,and the electric field force and ion drag force on the dust particles at the void boundary are estimated to explain the mechanism of spontaneous dust density wave *** occurring through the suppression mechanism is observed by modulating the ion streaming by applying an external sinusoidal signal to the dust *** sufficiently high modulation amplitude,the onset of period-doubling bifurcation is *** Fourier transform spectral analysis is done using time-series data obtained from high-speed video *** van der Pol equation with a force term is used to correlate the observed suppression phenomena.

关键词： dust density wave suppression phenomena strongly coupled dusty plasma forced van der Pol equation

PPARγLBD and its ligand specificity reveal a selection of potential partial agonist:Molecular dynamics based T2D drug discovery initiative

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BIOCELL 2021年第4期45卷 953-961页

作者： bidyut MALLICK ASHISH RANJAN SHARMA MANOJIT BHATTACHARYA SANG-SOO LEE CHIRANJIB CHAKRABORTY Department of Applied Science Galgotias College of Engineering and TechnologyKnowledge Park-IIGreater Noida201306India Institute for Skeletal Aging&Orthopedic Surgery Hallym University-Chuncheon Sacred Heart HospitalChuncheon-si24252Korea Department of Zoology Fakir Mohan UniversityVyasa ViharBalasore756020India Department of Biotechnology School of Life Science and BiotechnologyAdamas UniversityKolkata700126India

PPARγis a peroxisome proliferator-activated receptor(PPAR)family protein and is a target for type 2 diabetes(T2D).In this paper,we have performed a molecular docking analysis between ligand molecules(CID9816265,CID11608015,CID20251380,CID20251343,CID20556263,CID624491,CID42609928,and CID86287562)and PPARγto determine the ligand *** also helps to understand the ligand-binding domain(LBD)activity of PPARγduring the binding of the ***,a molecular dynamics simulation study was performed to determine the ligand biding stability in the PPARγ*** ligand specificity informed us about the potentiality of selecting a partial *** study also shows the binding conformation of Ceramicine B having hydrogen bonding affinity with a tricyclic polar head and stabilized theβ-sheet *** the other hand,the tricyclic polar head of nimbolide also formed hydrogen bonding(Ser342),but it shows a lesser degree of stabilization in theβ-sheet *** shows the binding conformation of partial agonist(PPARγ)in the Pocket-II of PPARγLBD,which has a significant role in stabilizing theβ-sheet *** might help to regulate ERK/Cdk5 mediated phosphorylation of *** study helps us understand the valid pose of a set of ligands confirmation and target protein conformation using docking and molecular dynamics *** in silico study will also help to initiate a drug discovery process of T2D.

关键词： PPARγ Partial agonist Molecular simulation T2D Drug discovery

Self-adaptive bulk/surface engineering of Bi_(x)O_(y)Br_(z) towards enhanced photocatalysis:Current status and future challenges

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Journal of Energy Chemistry 2023年第7期82卷 387-413,I0009页

作者： Zhiwei Wu bidyut Kumar Kundu Wanqiong Kang Lei Mao Sen Zhang Lan Yuan Fen Guo Chuang Han Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081HubeiChina Department of Chemistry University of CincinnatiCincinnatiOH 45221United States The PLA Rocket Force Command College Wuhan 430012HubeiChina Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina

The bulk/surface states of semiconductor photocatalysts are imperative parameters to maneuver their performance by significantly affecting the key processes of photocatalysis including light absorption,separation of charge carrier,and surface site *** years have witnessed the encouraging progress of self-adaptive bulk/surface engineered Bi_(x)O_(y)Br_(z) for photocatalytic applications spanning various ***,despite the maturity of current research,the interaction between the bulk/surface state and the performance of Bi_(x)O_(y)Br_(z) has not yet been fully understood and *** this regard,a timely tutorial overview is quite urgent to summarize the most recent key progress and outline developing obstacles in this exciting ***,the structural characteristics and fundamental principles of Bi_(x)O_(y)Br_(z)for driving photocatalytic reaction as well as related key issues are firstly ***,we for the first time summarized different self-adaptive engineering processes over Bi_(x)O_(y)Br_(z)followed by a classification of the generation approaches towards diverse Bi_(x)O_(y)Br_(z)*** features of different strategies,the up-to-date characterization techniques to detect bulk/surface states,and the effect of bulk/surface states on improving the photoactivity of Bi_(x)O_(y)Br_(z)in expanded applications are further ***,the present research status,challenges,and future research opportunities of self-adaptive bulk/surface engineered Bi_(x)O_(y)Br_(z)are *** is anticipated that this critical review can trigger deeper investigations and attract upcoming innovative ideas on the rational design of Bi_(x)O_(y)Br_(z)-based photocatalysts.

关键词： Bismuth oxybromide Self-adaptive engineering Pollutant degradation Energy application Photocatalysis