Role of fiber morphology in thermal bonding

The aim of this research was to investigate the thermal point bonding process. Primary objectives were to carefully understand the changes taking place in the fiber structure due to applied heat and pressure, and the role of fiber morphology in determining optimum process conditions and the properties of the webs. To study fibers with varying morphology, i.e., from partially drawn as in spunbonding to fully drawn as in staple fiber nonwovens, fibers with a wide range of crystallinity and orientation were spun and characterized from a polypropylene resin. Thermally bonded carded webs were produced using these fibers and characterized in order to understand thermal bonding behavior of fibers with different morphology. The fibers with different morphologies differed in their bonding behavior. The fibers with higher molecular orientation and crystallinity tended to form a weak and brittle bond due to lack of polymer flow and fibrillation of the fibers in the bonded regions. In general, fibers with lower molecular orientation and lower crystallinity yielded stronger and tougher webs. Fibers with relatively less developed morphology also exhibited lower optimum bonding temperature. Significant morphological changes in fibers were observed during the thermal bonding process, in bonded as well as unbonded regions of the web. As a final step to see how the observations from staple fiber study translate to one of the relevant process during scale-up, spunbond studies were also conducted

CFD Simulation Studies on Integrated Approach of Solar Chimney and Borehole Heat Exchanger for Building Space Conditioning

In this communication, integrated approach of solar chimney and borehole heat exchanger has been studied by using computational fluid dynamics software. It is observed that, the room temperature can be maintained at 25-30 °C, at 4.9 ACH with this integrated approach in both peak summer and winter conditions. The cooling and heating effects are evaluated as 4.73-5.55 kW at 40 °C in summer and 8.27-10.56 kW at 5 °C in winter. The SC-BHE integrated system approach produced 21-37 % higher heating effect than the BHE alone system. In cooling mode SC fitted after the room in fluid circuit and it produces the induce effect for air suction from BHE along the air blower. So, integrated approach is a feasible solution for building space conditioning

Subarachnoid haemorrhage mimicking unstable angina: a case report

Subarachnoid haemorrhage (SAH) is medical emergency caused by bleeding into the subarachnoid space. It is caused by rupture of an aneurysm or arteriovenous malformations (AVM). Symptoms of SAH are severe headache, nausea, vomiting, impaired consciousness and seizures. Neck stiffness and neck pain are relatively uncommon. Risk factors are high blood pressure, smoking, family history, alcoholism and even cocaine use. Diagnosis is mainly made by CT scan of head which should be done within six hours of the onset of symptoms and occasionally lumber puncture can also be done. An electrocardiogram (ECG) of all patients with subarachnoid should be done because patient with SAH can have myocardial ischemia due to increased level of circulating catecholamines or due to autonomic stimulation of the brain. ECG changes associated with SAH primarily reflect repolarisation abnormalities involving ST segment, T wave, U wave and QTc interval. Myocardial ischemia or infarction is often suspected in patients with SAH. Even troponin levels may be raised in these patients. However, suspicion of SAH is a contraindication for thrombolytic and anticoagulant therapy. This is a case of SAH which was initially treated for acute coronary syndrome (ACS) on the basis of symptoms and gradually changing ECG findings but on CT Head, patient was having SAH

ANTIOXIDANT AND HEPATOPROTECTIVE ACTIVITY OF SHILAJIT (ASPHALTUM PUNJABINUM) AGAINST ALCOHOL INDUCED LIVER INJURY IN WISTAR RATS

To investigate the antioxidant, hepatoprotective activity and evaluation of effects on blood factors of Asphaltum punjabinum demonstrable in-vivo and in-vitro by the inhibition of alcohol induced Wistar rat. In-vitro antioxidant activity of Asphaltum punjabinum was evaluated by various assays, including reducing power, lipid peroxidation, DPPH. Hepatoprotective activity as judged by the blood factors and serum enzymes levels viz. Serum Glutamate Oxaloacetate Transaminase (SGOT), Serum Glutamate Pyruvate Transaminase (SGPT), Alkaline Phosphatase (ALP), Total Bilirubin (TBIL) and Direct Bilirubin (DBIL) as well as oxidant enzyme viz. Malon Dialdehyde (MDA) were prevented, while antioxidant enzymes viz. Super Oxide Dismutase (SOD), reduced glutathione (GSH) and catalase were elevated in liver tissues. Further histopathological examination of liver sections was carried out to support the induction of hepatotoxicity and hepatoprotective efficacy. The results showed potent activities on reducing power, lipid peroxide, DPPH, Superoxide anion. The histopathological observations supported the biochemical evidences of hepato protection. Elevated level of SOD and decreased level of MDA further strengthen the hepatoprotective observations. In the study, demonstrating the Asphaltum punjabinum has potent antioxidant and hepatoprotective activity against alcohol induced hepatic damage in experimental animals

Economics of Camel Rearing on Grasslands in Gujarat

Camel in India is primarily reared for carting/draft, agricultural operation, transportation in addition to the secondary utility of milk and hair production (Saini et al 2006). The One humped or Dromedary camel (Camelus dromedarius) is an important livestock species uniquely adapted to hot and arid environments (Schwartz, 1992). It is important livestock specie contributing significantly in rural economy and livelihood of desert dwellers in Kachchh region of Gujarat. It still plays a very distinctive role in various agricultural operations and rural transportation in dry land farming (Rajput and Tripathi, 2005). The Kachchh region of Gujarat has large camel herders’ population mainly reared on common grasslands. These herders not only move in different parts of this region for grazing but also visit adjoining area of Gujarat every year in search of better fodder resources. The present study highlights the socio-economics of camel herds of Kachchh, Gujarat

Synthesis, Characterization and Ion Exchange Properties of a New Ion Exchange Material: Bismuth (III) Iodophosphate

Eight samples of the three component cation  exchanger  [Bismuth(III)iodophosphate]  has  been  synthesized by mixing different  ratio of 0.1M bismuth nitrate, 0.1M potassium iodate, 0.1M orthophosphoric acid at pH between 0-1. The material shows ion exchange capacity for Na+ ion of 0.5meq/g.  It  has  been  characterized using  I.R., X-ray, TGA studies. A number of ion exchange studies like pH titration, chemical stability, thermal stability and distribution behaviour were studies. Ion exchange capacity has also been determined for various metal ions such as K+, Mg2+ etc. pH titration method was also used for the determination of ion exchange capacity. On account of the Kd values and elution pattern, the cation exchanger is found to be selective for Pb2+

The Study of Physical Parameters of Pb Modified Germanate Chalcogenide Glass

In the present paper we have studied the physical properties of Se-Sn-Pb chalcogenide material. The necessary physical parameters which have important role in determining the structure and strength of the material viz. constraints, coordination number, glass transition temperature etc. has been calculated. The decreasing trend has been found in cohesive energy, heat of atomization and mean bond energy. The glass transition has been studied using the Tichy-Ticha approach which also decreases. The decrease in these physical parameters is due to the increase of ionic character in the material. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3559

Bressoud-Subbarao type weighted partition identities for a generalized divisor function

In 1984, Bressoud and Subbarao obtained an interesting weighted partition identity for a generalized divisor function, by means of combinatorial arguments. Recently, the last three named authors found an analytic proof of the aforementioned identity of Bressoud and Subbarao starting from a $q$-series identity of Ramanujan. In the present paper, we revisit the combinatorial arguments of Bressoud and Subbarao, and derive a more general weighted partition identity. Furthermore, with the help of a fractional differential operator, we establish a few more Bressoud-Subbarao type weighted partition identities beginning from an identity of Andrews, Garvan and Liang. We also found a one-variable generalization of an identity of Uchimura related to Bell polynomials.Comment: 18 pages, Comments are welcome