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Review of construction and demolition waste management tools and frameworks with the classification,causes,and impacts of the waste

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Waste Disposal and Sustainable Energy 2024年第1期6卷 95-121页

作者： dewan Sabbir Ahammed Rayhan Iftekhar Uddin Bhuiyan Institute of Appropriate Technology(IAT) Bangladesh University of Engineering and Technology(BUET)DhakaBangladesh Department of Industrial and Production Engineering(IPE) National Institute of Textile Engineering and Research(NITER)NayarhatSavarDhakaBangladesh

This review looks over the current construction and demolition waste management(C&DWM)situations by scrutinizing the definition,classification,components,compositions,generated sources and causes,impacts of generated construction and demolition wastes(C&DWs),waste management hierarchy(WMH),3R principles(Reduce,Reuse,and Recycle),Circular Economy(CE),frameworks,tools,and approaches of C&*** reviewing the literature this study contributes to the literature by the following means:(a)suitable working definitions of C&DW and C&DWM are provided,(b)an expanded WMH for construction and demolition operations is presented,(c)frameworks of C&DWM are identified and listed as follows:frameworks based on WMH,including 3R principles and CE concept,frameworks focusing on the quantification,estimation,and prediction of generated C&DW,frameworks focusing on effective and sustainable C&DWM,frameworks focusing economic,social,and environmental performance assessment,frameworks based on multi-criteria analysis(MCA),frameworks based on post-disaster recovery period,and other miscellaneous frameworks,and(d)four categories of tools utilized in C&DWM are identified and explained,namely,approaches employed in C&DWM,information technology(IT)tools employed in C&DWM,multi-criteria decision analysis(MCDA)tools employed in C&DWM,and C&DWM ***,this study also found that CE,and green rating system(GRS)are widely used approaches,Building Information Modeling(BIM),Radio Frequency Identification(RFID),Geographic Information System,and Big Data are the extensively used IT tools,Analytical Hierarchy Process,FUZZY,TOPSIS(Technique for Order Preference by Similarity to the Ideal Solution),Weighted Summation,Elimination and Choice Expressing the Reality II,Elimination and Choice Expressing the Reality III,Evaluation of Mixed Data,and REGIME(REG)are the widely used MCA tools in C&DWM,and Prefabricated Construction and Modular Construction are broadly used C&DWM ***

关键词： Construction and demolition waste Construction and demolition waste management Frameworks and tools 3R principles(Reduce,Reuse,&Recycle) Waste management hierarchy

The use of Montgomery salivary bypass tubes and pharyngocutaneous fistula following salvage laryngectomy

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2024年第1期10卷 43-48页

作者： Courtney B.Shires Mackenzie Latour Merry Sebelik.k.runa dewan West Cancer Center GermantownTennesseeUSA Department of Otolaryngology-Head and Neck Surgery Louisiana State University Health ShreveportShreveportLouisianaUSA Department of Otolaryngology-Head and Neck Surgery Emory UniversityAtlantaGeorgiaUSA

Objectives:Pharyngocutaneous fistula(PCF)is the most common complication to follow total laryngectomy(TL)and is associated with increases in length of hospital stay and with a need for revision surgery or readmission,as well as with delays in return to oral *** who require salvageTL(STL)or primary(chemo)radiation therapy are at higher risk for developing *** to the quality‐of‐life burden of PCF on patients,limiting this occurrence is ***:We conducted a retrospective cohort study of patients undergoing STL with placement of Montgomery salivary bypass tube(MSBT)^(TM)for at least 2 weeks duration between 2013 and 2017 at a single *** patients all underwent free flap *** primary outcome of interest was development of *** outcomes included demographics,previous treatment,base of tongue(BOT)involvement,extent of defect,concurrent neck dissection(ND),and margin ***χ^(2) analysis was used to evaluate factors associated with ***:Forty‐four patients underwent STL with Montgomery tube placement and free flap *** developed PCF(18.2%).The average age was 61.6 years;36 patients were male(81.8%),whereas eight patients were female(18.2%).There was no association between PCF and previous chemoradiation versus radiation(15.8%vs.33.3%,P<0.30),BOT involvement versus not(11.1 vs.22.2%,P<0.38),circumferential versus partial defect(18.8%vs.17.9%,P<0.94),ND versus none(10%vs.25%,P<0.20),or margin ***:PCF complicated 18.2%of STL cases at our institution and was not associated with differences in primary treatment modality,presence of concomitant ND,extent of pharyngeal defect,BOT involvement,or positive frozen or permanent surgical margin.

关键词： free flap reconstruction Montgomery pharyngocutaneous fistula salivary bypass tube salvage total laryngectomy total laryngectomy

AN INVESTIGATION OF TURBULENT RECTANGULAR JET DISCHARGED INTO A NARROW CHANNEL WEAk CROSSFLOW

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Journal of Hydrodynamics 2008年第2期20卷 154-163页

作者： PATHAk Manabendra DASS Anoop k. dewan Anupam Department of Mechanical Engineering Indian Institute of Technology Guwahati Guwahati - 781039 India

A computational investigation of the mean flow field of turbulent rectangular jets issuing into a narrow channel crossflow is presented. The length of the jet slot spans more than 55% of the crossflow channel bed, leaving a small clearance between the jet edge and sidewalls. A finite volume code employing the standard k-εmodel is used to predict the mean, three-dimensional flow field. The mean flow field is investigated for two velocity ratios （6 and 9）. Important flow features, such as the formation of different vortical structures and their characteristics owing to different values of the velocity ratio, are discussed. Some predicted results are compared with the experimental data reported in the literature. The predicted mean and turbulent flow properties are shown to be in good agreement with the experimental data.

关键词： turbulent jet crossflow narrow charmel velocity ratio vortices

A MULTIGRID-ACCELERATED THREE-DIMENSIONAL TRANSIENT-FLOW CODE AND ITS APPLICATION TO A NEW TEST PROBLEM

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Journal of Hydrodynamics 2010年第6期22卷 838-846页

作者： kUMAR D.Santhosh DASS Anoop k. dewan Anupam School of Mechanical and Building Science Vellore Institute of TechnologyVellore-632014India Department of Mechanical Engineering Indian Institute of Technology GuwahatiGuwahati-781039India Department of Applied Mechanics Indian Institute of Technology Delhi Hauz KhasNew Delhi-110016India

A multigrid-assisted solver tbr the three-dimensional time-dependent incompressible Navier-Stokes equations on graded Cartesian meshes is developed. The spatial accuracy is third-order for the convective terms and fourth-order for the viscous terms, and a fractional-step strategy ensures second-order time accuracy. To achieve good time-wise efficiency a multigrid technique is used to solve the highly time-consuming pressure-Poisson equation that requires to be solved at every time step. The speed-up achieved by multigrid is shown in tabular form. The performance and accuracy of the code are first ascertained by computing the flow in a single-sided lid-driven cubic cavity with good grid-economy and comparing the results available in the literature. The code, thus validated, is then applied to a new test problem we propose and various transient and asymptotically obtained steady-state results are presented. Given the care taken to establish the credibility of the code and the good spatio-temporal accuracy of the discretization, these results are accurate and may be used for ascertaining the performance of any computational algorithm applied to this test problem.

关键词： incompressible flows three-dimensional cavity flow fractional-step method multigrid method Taylor-Gorier-Like (TGL) vortices grid transformation

ON EXTREMAL PROPERTIES FOR THE POLAR DERIVATIVE OF POLYNOMIALS

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Analysis in Theory and Applications 2011年第2期27卷 150-157页

作者： k. k. dewan Arty Ahuja Natural Sciences Jamia Millia Islamia Central Uniersity

If p（z） is a polynomial of degree n having all its zeros on ｜z｜ = k, k ≤ 1, then it is proved[5] that In this paper, we generalize the above inequality by extending it to the polar derivative of a polynomial of t... 详细信息

关键词： polynomial zeros inequality polar derivative

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美国高校信息素养教育TTT教学模式研究

图书馆学刊 2024年第7期46卷 105-110页

作者：石德万广西科技大学图书馆广西柳州545006

采用文献调研法和内容分析法展开网络调查,结合网络调查结果,对美国信息素养教育TTT教学模式的研究和实践进行分析。重点关注信息素养教育中美国各方对实施TTT模式的态度、基本要素及效果等。从教学管理部门、高校图书馆、专业教师3个... 详细信息

采用文献调研法和内容分析法展开网络调查,结合网络调查结果,对美国信息素养教育TTT教学模式的研究和实践进行分析。重点关注信息素养教育中美国各方对实施TTT模式的态度、基本要素及效果等。从教学管理部门、高校图书馆、专业教师3个层面对我国高校在信息素养教育中实施TTT教学模式提出相应的建议。

关键词：信息素养教育 TTT 教学模式美国高校

SOME POLYNOMIAL INEQUALITIES IN THE COMPLEX DOMAIN

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Analysis in Theory and Applications 2010年第1期26卷 1-6页

作者： k. k. dewan S. Hans Central University India

P（z）=∑v=0^n cvz^vbe a polynomial of degree n and let M（f, r） = max｜z｜=r ｜f（z）｜ for an arbitrary entire function f（z）. If P（z） has no zeros in ｜z｜〈 1 with M（P,1） = 1, then for ｜α｜〈 1, it is proved by Jain[Glasnik Matematicki, 32（52）（1997）, 45-51] that｜P（Rz）＋α（R＋1/2）^nP（z）｜≤1/2{｜1＋α（R＋1/2）^n｜＋｜R^n＋α（（R＋1/2）^n｜},R≥1,｜z｜=1. In this paper, we shall first obtain a result concerning minimum modulus of polynomials and next improve the above inequality for polynomials with restricted zeros. Our result improves the well known inequality due to Ankeny and Rivlin and besides generalizes some well known polynomial inequalities proved by Aziz and Dawood.

关键词： polynomial inequality restricted zeros

Effect of IOP based infusion system with and without balanced phaco tip on cumulative dissipated energy and estimated fluid usage in comparison to gravity fed infusion in torsional phacoemulsification

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Eye and Vision 2017年第1期4卷 127-136页

作者： Praveen k.Malik Taru dewan Arun kr Patidar Ekta Sain Dr Ram Manohar Lohia Hospital New DelhiIndia

Background:To evaluate the effect of three different combinations of tip designs and infusion systems in torsional phacoemulsification(INFINITI and CENTURION)in patients with *** to the manufacturer,two unique improvements in the Centurion are:active fluid dynamic management system and use of an intrepid balanced *** study specifically aimed to evaluate the beneficial effects,if any,of change in tip design and infusion system individually and in combination on both per-operative parameters as well as endothelial health over 6 ***:One hundred and twenty six consenting patients of grade 4.0-6.9 senile cataract were randomized into three groups for phacoemulsification:Group A(n=42):Gravity fed infusion system and 45° kelman miniflared ABS phaco tip;Group B(n=42):intraocular pressure(IOP)based infusion system and 45° kelman miniflared ABS phaco tip;Group C(n=42):IOP based infusion system and 45° Intrepid balanced phaco *** cumulative dissipated energy(CDE),estimated fluid usage(EFU)and total aspiration time(TAT)were compared *** endothelial parameters were followed up postoperatively for six ***:The three arms were matched for age(p=0.525),gender(p=0.96)and grade of cataract(p=0.177).Group C was associated with significant reductions in CDE(p=0.001),EFU(pkness(p=0.561).On post-operative evaluation,although all groups were comparable till 3 months,by 6 months,the percentage losses in endothelial cell density were significantly lower in group C as compared to the other ***:Use of an IOP based phacoemulsification system in association with use of the Intrepid balanced tip reduces the CDE,EFU and TAT in comparison to a gravity fed system with a mini flared tip or IOP based system with a mini flared tip while also providing better endothelia

关键词： Active fluidics CENTURION active Centurion IOP based infusion Torsional Phacoemulsification Intrepid balanced tip kelman miniflared tip Gravity based infusion Cumulative dissipated energy

Preoperative Serum Albumin Levels and Postoperative Acute kidney Injury in Off-Pump Coronary Artery Bypass Surgery: A Single-Center Study in Bangladesh

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World Journal of Cardiovascular Surgery 2024年第8期14卷 131-144页

作者： Ahmad Pear Salahuddin Md. Abir Tazim Chowdhury Munama Magdum dewan Iftakher Reza Chowdhury Nittya Nanda Pal Md. Nahedul Morshed Md. Zafar-Al-Nimari Latifa Nasrin Farooque Ahmed Department of Cardiac Surgery National Heart Foundation Hospital and Research Institute (NHFH&RI) Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Evercare Hospital Dhaka Dhaka Bangladesh National Institute of Preventive and Social Medicine Dhaka Bangladesh Mother and Child Welfare Center Cumilla Bangladesh

Background: Serum albumin, a vital plasma protein, helps maintain intravascular colloidal osmotic pressure, cardiac output, and renal function. Low preoperative serum albumin is linked to poor outcomes, including acute kidney injury (AkI), after off-pump coronary artery bypass (OPCAB) surgery. This study aimed to assess the relationship between preoperative serum albumin levels and early postoperative renal injury. Methods: This prospective comparative cross-sectional study was conducted from August 2019 to February 2021 at the National Heart Foundation Hospital & Research Institute, Bangladesh. It included 160 adult patients with normal preoperative renal function undergoing OPCAB. Patients were divided into two groups: Group A (serum albumin ≥ 4.0 gm/dl) and Group B (serum albumin Results: Preoperative serum albumin was significantly different between groups (Group A: 4.21 ± 0.05 gm/dl, Group B: 3.69 ± 0.04 gm/dl, p = 0.028). Group B had a higher incidence of hypertension (71.25% vs. 51.25%, p st and 3rd postoperative days were higher in Group B (p th day. Postoperative AkI occurred in 18.75% of Group A and 36.25% of Group B. Multivariate regression indicated that low preoperative serum albumin is an independent risk factor for postoperative AkI (p = 0.012, OR = 1.815, CI: 0.675 - 1.162). Conclusion: Preoperative serum albumin level is a valuable predictor of postoperative renal function. Ensuring high normal serum albumin levels before surgery can help minimize the risk of postoperative AkI.

关键词： Serum Albumin Acute kidney Injury (AkI) Off-Pump Coronary Artery Bypass Surgery Bangladesh