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Extension of a steady-state chlorine dioxide brightening model for Z-ECF bleaching of softwood kraft pulps 软木硫酸盐纸浆Z-ECF漂白稳态二氧化氯增白模型的扩展
Pub Date : 2021-04-01 DOI: 10.32964/tj20.3.186
B. Brogdon, Lucia Lucian
Earlier studies developed a steady-state model to predict the brightness and/or bleach consumption during the chlorine dioxide brightening (D1) of softwood pulps produced by conventional elemental-chlorine-free (ECF) sequences. This model relates the chlorine dioxide consumed to the brightness gains predicated upon an asymptotic D1 brightness limit, an incoming D1 pulp brightness, and an equation parameter (β11). The current investigation examines the application of this model to ECF sequences that use ozone delignification (Z-ECF). Literature D1 data from various Z-ECF bleaching studies, which investigated OZ, OD0/Z, and OZ/D0 delignification, were fitted to the model. The β11 parameter was found to be linearly correlated to the entering kappa number. Interestingly, this linear relationship was found to be identical to the relationships observed when modeling the D1 stage for conventional ECF and chlorine-based bleach sequences. Subtle differences in D1 brightening response in the model among the various bleach sequences are reflected by incoming pulp brightness (at the same kappa number). The current model is used to illustrate how alterations to Z-ECF delignification affect D1 brightening and chlorine dioxide consumption.
早期的研究开发了一个稳态模型来预测传统无元素氯(ECF)序列生产的软木纸浆在二氧化氯增白(D1)过程中的亮度和/或漂白剂消耗。该模型将消耗的二氧化氯与基于渐近D1亮度限制、输入D1纸浆亮度和方程参数(β11)的亮度增益联系起来。目前的研究考察了该模型在使用臭氧脱木质素(Z-ECF)的ECF序列中的应用。文献D1数据来自各种Z- ecf漂白研究,其中调查了OZ, OD0/Z和OZ/D0脱木质素,并拟合到模型中。β11参数与输入kappa数呈线性相关。有趣的是,这种线性关系被发现与传统ECF和氯基漂白剂序列在D1阶段建模时观察到的关系相同。不同漂白剂序列在模型中D1增白响应的细微差异反映在相同卡帕数下的入浆亮度上。目前的模型是用来说明如何改变Z-ECF脱木质素影响D1增亮和二氧化氯消耗。
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引用次数: 0
Boiler retrofit improves efficiency and increases biomass firing rates 锅炉改造提高了效率,增加了生物质燃烧率
Pub Date : 2021-04-01 DOI: 10.32964/tj20.3.173
S. Pethe, Paul W. Cloninger, Ryan R. Shortreed, Ken M. Hardison
Domtar’s fluff pulp mill in Plymouth, NC, USA, operates two biomass/hog fuel fired boilers (HFBs). For energy consolidation and reliability improvement, Domtar wanted to decommission the No. 1 HFB and refurbish/retrofit the No. 2 HFB. The No. 2 HFB was designed to burn pulverized coal and/or biomass on a traveling grate. The steaming capacity was 500,000 lb/h from coal and 400,000 lb/h from biomass. However, it had never sustained this design biomass steaming rate. As the sole power boiler, the No. 2 HFB would need to sustain 400,000 lb/h of biomass steam during peak loads. An extensive evaluation by a combustion and boiler technologies supplier was undertaken. The evaluation involved field testing, analysis, and computational fluid dynamics (CFD) modeling, and it identified several bottle-necks and deficiencies to achieving the No. 2 HFB’s biomass steam goal. These bottlenecks included an inadequate combustion system; insufficient heat capture; excessive combustion air temperature; inadequate sweetwater con-denser (SWC) capacity; and limited induced draft fan capacity.To address the identified deficiencies, various upgrades were engineered and implemented. These upgrades included modern pneumatic fuel distributors; a modern sidewall, interlaced overfire air (OFA) system; a new, larger economizer; modified feedwater piping to increase SWC capacity; replacement of the scrubber with a dry electro-static precipitator; and upgraded boiler controls.With the deployment of these upgrades, the No. 2 HFB achieved the targeted biomass steaming rate of 400,000 lb/h, along with lowered stack gas and combustion air temperatures. All mandated emissions limit tests at 500,000 lb/h of steam with 400,000 lb/h of biomass steam were passed, and Domtar reports a 10% reduction in fuel firing rates, which represents significant fuel savings. In addition, the mill was able to decommission the No. 1 HFB, which has substantially lowered operating and maintenance costs.
Domtar公司位于美国北卡罗来纳州普利茅斯的绒毛纸浆厂运营着两台生物质/生猪燃料锅炉(HFBs)。为了整合能源和提高可靠性,Domtar公司希望退役1号HFB,并对2号HFB进行翻新/改造。2号HFB设计用于在移动篦上燃烧煤粉和/或生物质。蒸汽量为煤50万磅/小时,生物质40万磅/小时。然而,它从未维持这种设计的生物质蒸腾速率。作为唯一的动力锅炉,2号HFB在高峰负荷期间需要维持400,000 lb/h的生物质蒸汽。由一家燃烧和锅炉技术供应商进行了广泛的评估。评估包括现场测试、分析和计算流体动力学(CFD)建模,并确定了实现2号HFB生物质蒸汽目标的几个瓶颈和缺陷。这些瓶颈包括不完善的燃烧系统;热捕获不足;燃烧空气温度过高;甜水冷凝器(SWC)容量不足;并且引风机容量有限。为了解决已识别的缺陷,设计并实现了各种升级。这些升级包括现代气动燃油分配器;一个现代化的侧壁,交错过火空气(OFA)系统;一个新的,更大的省煤器;改进给水管,增加SWC容量;用干式静电除尘器更换洗涤器;升级锅炉控制系统。随着这些升级的部署,2号HFB实现了400,000 lb/h的目标生物质蒸腾速率,同时降低了烟囱气体和燃烧空气温度。在500,000 lb/h蒸汽和400,000 lb/h生物质蒸汽的条件下,所有规定的排放限值测试都通过了,Domtar报告称,燃料燃烧率降低了10%,这意味着显著节省了燃料。此外,该工厂能够使1号HFB退役,这大大降低了运营和维护成本。
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引用次数: 0
Development of converging-diverging multi-jet nozzles for molten smelt shattering in kraft recovery boilers 硫酸盐回收锅炉熔体粉碎用聚散式多喷嘴的研制
Pub Date : 2021-04-01 DOI: 10.32964/tj20.3.199
E. Jin, T. Habib, Simon Youssef, Steve Osborne, H. Tran
The effective shattering of molten smelt is highly desired in recovery boiler systems. Ideally, shatter jet nozzle designs should: i) generate high shattering energy; ii) create a wide coverage; and iii) minimize steam consumption. This study proposes a novel converging-diverging multi-jet nozzle design to achieve these goals. A laboratory setup was established, and the nozzle performance was evaluated by generating jet pressure profiles from the measurement of a pitot tube array. The results show that the shatter jet strength is greater with a large throat diameter, high inlet pressure, and a short distance between the nozzle exit and impingement position. Increasing the number of orifices generates a wider jet coverage, and the distance between the orifices should be limited to avoid the formation of a low-pressure region between the orifices. The study also demonstrates that an optimized converging-diverging multi-jet nozzle significantly outperformed a conventional shatter jet nozzle by achieving higher energy and wider coverage while consuming less steam.
在回收锅炉系统中,有效粉碎熔融熔体是非常需要的。理想情况下,粉碎喷嘴的设计应该:i)产生高的粉碎能量;Ii)建立广泛的覆盖面;iii)尽量减少蒸汽消耗。本研究提出了一种新型的会聚发散多喷嘴设计来实现这些目标。建立了实验室装置,并通过测量皮托管阵列产生的射流压力曲线来评估喷嘴的性能。结果表明:较大的喉道直径、较高的进口压力和较短的喷嘴出口与撞击位置之间的距离可以提高破碎射流的强度;增加孔口的数量可以产生更大的射流覆盖范围,并且孔口之间的距离应该受到限制,以避免孔口之间形成低压区。该研究还表明,优化后的聚散多喷嘴在消耗更少蒸汽的同时,获得了更高的能量和更大的覆盖范围,显著优于传统的破碎射流喷嘴。
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引用次数: 0
INFLUENCE OF CLASS SIZE ON STUDENTS’ AND TEACHERS’ MOTIVATION DURING INSTRUCTION 班级规模对学生和教师教学动机的影响
Pub Date : 2021-03-30 DOI: 10.51380/GUJR-37-01-10
Syed M Amir, I. Ullah, M. Kaleem
This descriptive research investigated influence of class size on the students’ and teachers’ motivation during the instruction. The study objectives focused the effects of class size on the students’ initiation in completing instructional tasks, stimulating them in expressing the ideas freely and in provision of positive feedback to them during the instruction. Three null hypotheses were formulated to observe the significance differences between observed and expected proportion about target objectives. For this purpose, the data were collected from 4th grade students and teachers of 51 government primary schools through observation sheets and questionnaire respectively. Collected data were analysed through mean and chi-square. The major findings indicated that small class size assisted teachers as well as students to exhibit higher level of the motivation and interest during instruction. However, no significant differences noted between the observed and expected proportion about level of initiation, completion of task, rate of stimulation and provision of feedback among students belonging to different level of class size.
本研究旨在探讨班级规模对教师和学生教学动机的影响。研究的目的是关注班级规模对学生主动完成教学任务的影响,激励学生在教学过程中自由地表达想法,并向他们提供积极的反馈。提出三个零假设,观察目标目标的观察比例与预期比例之间的显著性差异。为此,本研究采用观察表法和问卷法分别对51所官立小学四年级学生和教师进行调查。收集的数据通过均数和卡方分析。主要研究结果显示,小班教学有助于教师和学生在教学过程中表现出更高的动机和兴趣。然而,在不同班级规模的学生中,在启动水平、任务完成程度、刺激率和提供反馈方面,观察到的比例与预期的比例没有显著差异。
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引用次数: 1
PERCEPTIONS OF TEACHER EDUCATORS AND PROSPECTIVE TEACHERS ON THE ASSESSMENT LITERACY AND PRACTICES 教师教育者和准教师对评估素养和实践的看法
Pub Date : 2021-03-30 DOI: 10.51380/GUJR-37-01-07
S. Hussain, M. Idris, Zarina Akhtar
This study explores the teacher educators' and prospective teachers’ perceptions regarding classroom assessment literacy and practices. It specifically aims to respond to questions: ‘what teacher educators and student teachers perceive with regard to classroom assessment, purposes, approaches, literacy and practices? How many perceptual differences exist between teacher educators and student teachers on classroom assessment practices? Through sequential triangulation, mixed-method research design data were collected over interview protocols and a Likert design questionnaire. Further, qualitative data were analyzed through a thematic approach while quantitative data were analyzed through mean scores and t-test. The results indicated significant differences in the understanding of classroom assessment practices of teacher educators and student teachers. Furthermore, student teachers feel tense due to prevalent assessment mechanisms. The results also revealed that prevalent assessment approaches fall short of developing requisite skills among student teachers. Thus, alternative assessment practices with more students centered and real-life approaches were recommended for prospective teachers in classroom situations.
本研究探讨了教师教育者和准教师对课堂评估、素养和实践的看法。它特别旨在回答以下问题:“教师、教育者和学生教师对课堂评估、目的、方法、素养和实践的看法是什么?”在课堂评估实践中,教师教育者和学生教师之间存在多少感知差异?通过序贯三角测量,混合方法研究设计数据通过访谈协议和李克特设计问卷收集。定性数据采用主题法分析,定量数据采用均分和t检验分析。结果显示,教师教育工作者和学生教师对课堂评估实践的理解存在显著差异。此外,由于普遍的评估机制,实习教师感到紧张。结果还表明,普遍的评估方法不能培养实习教师的必要技能。因此,为未来的教师在课堂上推荐了更多以学生为中心和现实生活方法的替代评估实践。
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引用次数: 1
OIL PRICES MOVEMENTS AND INDUSTRY STOCK RETURNS: EVIDENCE FROM PAKISTAN STOCK EXCHANGE (PSX) 石油价格变动和行业股票回报:来自巴基斯坦证券交易所(psx)的证据
Pub Date : 2021-03-30 DOI: 10.51380/GUJR-37-01-08
M. Asif, Sharif Ullah Jan, Shabab Iqbal
The recent financial and economic recessions have chiefly increased the importance of risk management and forecasting for business firms. Capital markets being the main pillar of economy are affected the most in such circumstances. The current study has attempted to investigate the impact of oil prices on the returns and volatility of Pakistani listed firms using the GARCH (1,1) model. Furthermore, this relationship has been investigated by categorizing the existing sectors of the Pakistan Stock Exchange (PSX) into oil producers, oil users, and oil substitutes for the period from January 2015 to December 2019. The findings of the study highlighted some strong evidence regarding the oil price movement and the firms’ returns across these sectors. Interestingly, firms’ returns behave differently about the magnitude of significance and direction of symbols based on their nature of the industry. Therefore, it is suggested for future studies to consider the nature of the sector of oil while exploring the relationship between oil prices and stock returns.
最近的金融和经济衰退主要增加了风险管理和预测对商业公司的重要性。在这种情况下,作为经济主要支柱的资本市场受到的影响最大。目前的研究试图利用GARCH(1,1)模型调查石油价格对巴基斯坦上市公司收益和波动性的影响。此外,通过将2015年1月至2019年12月期间巴基斯坦证券交易所(PSX)的现有行业分类为石油生产商、石油用户和石油替代品,研究了这种关系。研究结果强调了一些关于油价走势和这些行业公司回报的有力证据。有趣的是,基于行业性质的不同,公司的回报对符号的重要性和方向表现不同。因此,建议未来的研究在探讨石油价格与股票收益的关系时,考虑石油行业的性质。
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引用次数: 1
IMPACT OF ETHICS, STRESS AND TRUST ON CHANGE MANAGEMENT IN PUBLIC SECTOR ORGANIZATION 道德、压力和信任对公共部门组织变革管理的影响
Pub Date : 2021-03-30 DOI: 10.51380/GUJR-37-01-05
S. Ahmad, Muhammad Ibrahim, A. Nadeem
The aim of the study is to find out a successful way of managing the organizational change in public sector organizations. The research is based on a structured questionnaire survey. The data was collected in some of the top public sector organizations in Pakistan. The study suggests that Stress, Trust, and Ethics have a strong relationship with Organizational Change Management. Organizations must minimize the workplace stress, maximize trust of workers on management and organization and ensure ethics for organization change management. The managerial implication of the research is, bringing and making any organizational change is very difficult without employee-friendly working environment of the organization. The results of the study make it easy, how to put employees on the right track for achieving organizational goals and objectives in any Organizational Change by using Facilitation.
本研究的目的是找出管理公共部门组织变革的成功方法。本研究以结构化问卷调查为基础。这些数据是在巴基斯坦一些顶级公共部门组织中收集的。研究表明,压力、信任和道德与组织变革管理有很强的关系。组织必须最大限度地减少工作场所压力,最大限度地提高员工对管理层和组织的信任,并确保组织变革管理的道德规范。本研究的管理意义在于,没有一个对员工友好的组织工作环境,任何组织变革的产生和实施都是非常困难的。研究的结果使它很容易,如何让员工在正确的轨道上实现组织的目标和目的,在任何组织变革中使用促进。
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引用次数: 3
THE EFFECTS OF STRUCTURAL CAPITAL ON ORGANISATIONAL EFFICIENCY 结构资本对组织效率的影响
Pub Date : 2021-03-30 DOI: 10.51380/GUJR-37-01-01
F. O. Edeh, Yeo Sook Fern, A. Nawaz
Policymakers and practitioners in telecommunication industry are not fully aware of the positive significance of structural capital to the enhancement of their operational and workers efficiency. The aim of this study therefore is to examine the effects of structural capital on organisational efficiency of ICT companies in the Sub-Saharan Africa using the knowledge-based view as theoretical underpinning. Cross-sectional research design was employed while the simple random sampling was used to select five ICT firms. Accessible population of two hundred and fifty participants was drawn from sample frame of five telecommunication firms. Sample size of one hundred and fifty-two was determined from accessible population. Hypotheses were analysed with multiple linear regression techniques with the aid of IBM SPSS. Study found that structural capital has significant positive effects on the organisational efficiency of ICT companies. The study concludes that structural capital measured in terms of process capital, innovation capital and customer capital enhance the organisational efficiency of ICT companies in Sub-Saharan Africa.
电信行业的决策者和从业者并未充分认识到结构性资本对提高其运营效率和员工效率的积极意义。因此,本研究的目的是使用基于知识的观点作为理论基础来检验结构资本对撒哈拉以南非洲ICT公司组织效率的影响。采用横断面研究设计,采用简单随机抽样方法选取5家信息通信技术企业。从五家电信公司的样本框架中抽取了250名参与者。样本量为152人,从可及人群中确定。利用IBM SPSS软件对假设进行多元线性回归分析。研究发现,结构资本对信息通信技术公司的组织效率有显著的正向影响。研究得出结论,以流程资本、创新资本和客户资本衡量的结构性资本提高了撒哈拉以南非洲ICT公司的组织效率。
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引用次数: 1
CURRICULUM CHANGE IN PAKISTAN: LESSONS LEARNED FROM THE PAST AND THE WAY FORWARD 巴基斯坦的课程改革:从过去吸取的教训和前进的道路
Pub Date : 2021-03-30 DOI: 10.51380/GUJR-37-01-06
Muqaddas Butt, Shumaila Mahmood, Tanzeela Urooj
For contributing to the inherent dynamic nature of society, things are always moving, developing, growing and changing. Education is fundamental in responding to the societal change therefore, change is inevitable in education too. The immediate context of this paper is Punjab (Pakistan) followed by the implementation process of the most recent change in secondary school National Curriculum for English. The focus revolves around the questions; ‘to what extent the secondary school English teachers were involved in planning and designing English curriculum change (CC2006), and what the contextual conditions secondary school teachers were provided enabling them to enact CC2006 effectively? The study adopted a mixed method approach. The quantitative data was collected by administering questionnaire towards 243 secondary school English teachers followed by conducting the case studies of four secondary schools for gathering the qualitative data. The findings revealed that teachers were seldom consulted during planning or design phase of CC2006.
事物总是在运动、发展、成长和变化,这是社会固有的动态性的贡献。教育是应对社会变化的根本,因此,教育的变化也是不可避免的。本文的直接背景是旁遮普(巴基斯坦)紧随其后的中学国家英语课程最新变化的实施过程。焦点围绕着问题;中学英语教师在多大程度上参与了英语课程改革(CC2006)的规划和设计,中学教师获得了哪些环境条件,使他们能够有效地实施CC2006 ?本研究采用混合方法。定量数据是通过对243名中学英语教师进行问卷调查,然后通过对四所中学的个案研究来收集定性数据。调查结果显示,在CC2006的规划或设计阶段,很少咨询教师。
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引用次数: 1
THEOCRATIC AUTOCRACY IN PAKISTAN BETWEEN 1977 TO 1988 FROM THE PERSPECTIVE OF GRAMSCI'S THEORY OF CULTURAL HEGEMONY 从葛兰西的文化霸权理论看1977 - 1988年间巴基斯坦的神权专制
Pub Date : 2021-03-30 DOI: 10.51380/GUJR-37-01-03
Muhammad Uzair Hashmi
This paper employs the Gramsci's "Theory of Cultural Hegemony" to investigate the objectives, methodology, and outcomes of theocratic political approach opted by the autocratic regime in Pakistan between 1977 to 1988. Gramsci Cultural Hegemony theory provides parameters of analysis such as "traditional intellectuals," "manufactured consent," "civil society," "political society," "organic intellectuals," and "historic bloc," which serve as concrete foundations for data analysis through the qualitative research methodology. This paper is significant as it elucidates how "political society" (authoritarian regimes), rather than choosing coercion, exercise “soft tools” over "civil society" (religious intellectuals) to manufacture the consent of the masses. This paper is unique as it has attempted to apply the Gramsci's cultural hegemony theory in its true essence to bring to light the long-term repercussions of the hegemonic policies of Zia's rule and to answer the unanswered questions regarding the foreign and internal policy challenges in today's Pakistan.
本文运用葛兰西的“文化霸权理论”,考察了1977 - 1988年间巴基斯坦独裁政权选择神权政治途径的目的、方法和结果。葛兰西文化霸权理论提供了“传统知识分子”、“制造同意”、“市民社会”、“政治社会”、“有机知识分子”、“历史集团”等分析参数,这些参数是通过定性研究方法进行数据分析的具体基础。这篇论文很重要,因为它阐明了“政治社会”(专制政权)如何使用“软工具”而不是选择强制手段来制造大众的同意,而“公民社会”(宗教知识分子)。这篇论文是独一无二的,因为它试图应用葛兰西的文化霸权理论,在其真正的本质上揭示齐亚统治的霸权政策的长期影响,并回答有关今天巴基斯坦外交和国内政策挑战的未回答的问题。
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引用次数: 0
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