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Optimization of Dedicated Natural Gas High Comp. Spark Ignition Engine for Maximum Efficiency and Minimum Emission

Thesis Info

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Author

Mansha, Muhammad

Program

PhD

Institute

University of Engineering and Technology

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2013

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/2756/1/2913S.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726817584

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All around the world the number of automobiles has increased many folds (about ten times) in the last fifty years which resulted in an enormous increase in urban pollution level especially in developing countries. Pakistan has been considered as the most urbanized country in South East Asia with about 36% of Pakistan‟s total population is residing in towns & cities. It has been estimated that an average vehicle in Pakistan emits 20 times more unburned hydrocarbons (UHCs), 24 times as much carbon monoxide (CO) & about 3.6 times more oxides of nitrogen (NOx) when compared to an average vehicle in U.S. Furthermore the scarcity of conventional fuels also propelled the world to explore alternative fuel options with same or preferably less environmental implications. Natural gas is rated as high octane alternative fuel with octane rating of 120~130 and exhibiting clean burning characteristics. It is possible to attain increased efficiency from natural gas because of its high octane value with the increase of the compression ratio of the engine. Further the improved combustion efficiency of natural gas fuel also reduces the tail pipe pollutant emission. The focus of this research is to suggest the optimum compression ratio at which the performance of dedicated natural gas engine can be optimized. A 2.5 L Diesel Engine was selected and converted to run solely on natural gas as dedicated mode by incorporating spark plugs, electronic ignition control system, and CNG fuel metering system. Different piston sets were modified to obtain selected compression ratios. Based on the literature review, compression ratios were 11, 12, 13 & 14 had been selected. The temperature gauges were installed in the cooling water circuit and exhaust manifold to measure the water & exhaust gas temperatures. The engine was then tested on dynamometer for performance & exhaust emission. The readings of NOx, CO, UHCs at 1000, 1500, 2000, 2500 and 3000 rpm at selected compression ratios were taken by using 5-gas exhaust gas analyzer. For emission testing, steady-state test profile was generated. Exhaust gas temperatures were also recorded at different rpm settings at selected compression ratios. The results have been plotted and normalized by power. Based on the engine performance, the compression ratio of 13 has been selected as optimum compression ratio for dedicated CNG engine. For further reduction of engine exhaust emission Three-Way Catalytic simulation through Chemkin software has been carried out and the performance parameters were also predicted through simulation using single-zone thermodynamic model.
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ٹریفک کے قوانین کی پابندی

ٹریفک کے قوانین کی پابندی
نحمدہ ونصلی علی رسولہ الکریم امّا بعد فاعوذ بااللہ من الشیطن الرجیم
بسم اللہ الرحمن الرحیم
معززصدر ِمحترم اور میرے ساتھیو! السلام علیکم۔ آج مجھے جس موضوع پرلب کشائی کرنی ہے وہ ہے:’’ٹریفک کے قوانین کی پابندی‘‘
صدرِ ذی وقار!
بظاہر انسان پیدائش سے لے کر وفات تک پابندیوں کے جال میں پھنسا رہتا ہے۔ کوئی پابندیاں اُس پر خاندان کی طرف سے ہوتی ہیں، کوئی پابندی اُس پر اہل خانہ کی طرف سے ہوتی ہے۔ کہیں معاشرے کی پابندیاں اُس کو پابند سلاسل بنارہی ہیں، اور جب ہوش سنبھلتاہے، کھوٹے اور کھرے میں تمیز کرنے کی نوبت آتی ہے توبحیثیت مسلمان اسلامی پابندیاں، عبادات کی پابندیاں، معاملات کی پابندیاں، اعتقادات کی پابندیاں اُس کے گرد گھیراتنگ کر دیتی ہیں۔
بعض پابندیاں ایسی ہوتی ہیں جس سے آزادی کی نعمت چھن جاتی ہے اور بعض پابندیاں ایسی ہوتی ہیں کہ وہ آزادی کے استحکام اور استمرار بخشنے میں ممد و معاون ثابت ہوتی ہیں، جیسے اسلامی پابندیاں جو بظاہر پابندیاں نظر آتی ہیں لیکن حقیقتاً وہ آزادی جاں فزا ہوتی ہیں۔
وہ ایک سجدہ جسے تو گراں سمجھتا ہے
ہزار سجدے سے دیتا ہے آدمی کو نجات
جنابِ صدر!
بعض پابندیاں ایسی ہوتی ہیں جو حکومت عوام اور ملک و قوم کے تحفظ کی خاطرلگاتی ہے۔ ان ہی میں ٹریفک کے قوانین کی پابندی ہے ،ٹریفک سے مراد گاڑیوں کی آمد ورفت ہے، گاڑیوں کی آمد ورفت میں آئے دن اضافہ ہورہا ہے۔ گاڑیوں کا اژد ہا آئے روز بڑھتا جارہا ہے، ٹر یفک کے قوانین کی پابندی جان کی حفاظت کے لیے انتہائی ناگزیر ہے، ایک لمحہ کی غفلت جان لیوا ثابت ہوسکتی ہے ، ٹریفک کے قوانین کی پابندی سے جہاں دیگر حضرات محفوظ رہتے ہیں وہاں حادثے سے اور اپنی جان کے ضیاع سے خودڈرائیور...

Use of Barcode Based Traditional Games in Improving Student Learning Outcomes in Learning Citizenship Education (Ppkn)

This study collaborates between traditional games and technology. The purpose of this study was to improve student learning outcomes in PPKN (Citizenship Education) learning through barcode-based traditional games tumbawa. This type of research is classroom action research. This research was conducted because based on preliminary observations, the results of students' daily tests in PPKn learning were still low, from 25 students, 25 students, only 12 people or 48% had good learning outcomes. The procedures used in this study consisted of planning, implementing, observing, reflecting. This research was conducted in two cycles of action. The data collection methods used were tests, observation, interviews, and documentation. In analyzing the data used a qualitative descriptive method assisted by the calculation of the percentage. The targeted research output is the national journal published in the internationally accredited journal 5. The level of technology readiness used is in the field of education (TKT 2). This research is expected to create a learning atmosphere and a learning process that attracts students' attention so that it provides better learning achievement than before.

Molecular Characterization of Viral and Host Genetic Factors in Hepatitis C Virus Infection

Hepatitis C virus (HCV) infection has become a major public health problem, affecting 170 million people worldwide. Chronic infection is a leading cause of liver cirrhosis and hepatocellular carcinoma (HCC). No vaccine has been developed against HCV so far. Recommended treatment regimen for chronic hepatitis C is pegylated interferon α-2a or α-2b and ribavirin combination therapy (PEG-IFN-α/RBV) for 24-48 weeks. In addition recently discovered direct acting agents (DAA) have also been used. Despite all these therapies, a significant number of HCV patients show no response to the treatment. It is well known that genetic diversity of hepatitis C virus and individual hosts genetic makeup plays a significant role in the treatment success or failure of HCV patients, therefore, it is necessary to find out the exact reason behind this non-response. In the current study we have investigated the role of viral and host factors with treatment response in HCV-3a patients because HCV-3a genotype is more common in Pakistan. Viral factors included viral genotype, baseline viral load and NS5A gene mutations. HCV genotype 2 and 3 show better sustained virological response (SVR) (80%-90%) compared to those infected with genotype 1and 4 (SVR=40%-52%). Therefore, genotype determination is clinically important before start of therapy. Similarly, determination of genotypes in selected population would be helpful to understand origin, pattern of spread of infection throughout the population and to design the prevention policy for hepatitis infection. The prevalence pattern of genotypes and subtypes is variable from country to country or within the same country. According to clinical and scientific literature, genotype 3a infection is the most prevalent HCV subtype in Pakistan. This data is based on PCR focused genotyping assays. Ideal approach for accurate genotyping is sequencing. In order to select proper treatment for HCV patients, understand epidemiology and validate the results of genotyping, we sequenced HCV 5′ UTR Core and NS5B regions to determine genotype of HCV. 5′ UTR Core and NS5B were found to be the most conserved regions which reflected the variation of full genome. However, 5′ UTR region is widely used for genotyping in all methods due to efficient amplification. One hundred and sixty samples were genotyped by sequencing 241bp 5′ UTR, 25 samples by 441bp Core gene region and 20 samples ii by 388bp NS5B gene Okamoto region. Nucleotide blast, manual sequence analysis and phylogenetic analysis of these three regions of HCV genome confirmed that the most frequent genotype was 3a followed by 1a, 3b, and 4. Genotype 5 and 6 were not detected in any sample. One complete genome of HCV was also sequenced to confirm the results of above methods by phylogenetic analysis. Although HCV 3a responds better to PEG-IFN-α/RBV therapy, we found a significant number of HCV 3a patients who were non responder to the therapy. Mutations in HCV NS5A gene interferon sensitivity determing region (ISDR) and protein kinase R (PKR) binding domain (PKRBD) are associated with non-response to therapy in HCV-1a infected populations. HCV introduce mutations in this region by immune defense mechanism to escape antiviral therapy. In order to determine the role of mutations to non-response of genotype 3a to PEG-IFN-α/RBV therapy, 416 bp segment of NS5A gene covering ISDR and PKRBD was sequenced from responders and non-responders HCV-3a patients for comparison. No significant difference was found in ISDR and PKRBD region, however downstream to the PKRBD of NS5A two important statistically significant mutations were observed; at positions 2309 (Alanine to Serine) and 2326 (Glycine to Alanine). These mutations were then analyzed for tertiary protein structure and important structural changes were observed which might cause non-response to therapy. Moreover, we investigated the correlation of baseline viral load with PEG-IFN-α/RBV therapy and found association of low viral load with better response to therapy. Host factors included age, gender, alanine aminotransferase (ALT) levels, liver fibrosis stage and IL28B gene polymorphisms of HCV infected patients. Among the host factors we did not find any association of gender ALT levels and liver fibrosis stage with the treatment response. However, younger age was a strong predictor of treatment success. For IL28B, SNP rs12979860 was studied in two hundred and nineteen HCV-3a patients treated with standard IFN-α and ribavirin. We have found an important result showing the involvement of CC genotype in protection against infection rather than clearance. The TT genotype has revealed good response to treatment. It shows that the patients with genotype 3 and Il28B CC genotype are more likely to develop chronic disease and CT/TT genotypes give better response to treatment compared to CC genotype. The CC genotype provides protection against infection whereas TT genotype showed good response to the treatment. Further exploration of iii this chromosomal region might be helpful in finding associations for genotype 3 infected patients. This knowledge could facilitate the development of tests for efficient genotyping of patients thus leading to a better and more personalized treatment. Ultimately, this approach may prevent treatment failures and avoid unnecessary side effects. These findings would be beneficial as pre-diagnostic marker for HCV patients. It will be helpful to avoid receiving ineffective antiviral therapy to non-responder (NR) patients and predetermine the treatment strategies (adjuvant therapy of PEG-IFN-α/RBV and direct acting agents).