Coal has been using as a major source of energy all over the world formany centuries. In Pakistan, with an average estimation, coal reserves of about 185 billion tons has been reported and stands 7th in ranking based on the lignite coal resources which is being utilized for commercial as well as domestic usage. In the present study, 417 coal mines located in the Eastern Salt Range of Pakistan were visited, out of which only 64 mines were active. It was found that most of the mines in study area were abandoned due to poor quality of coal seam and failures due to stresses, seepage and poor support system. Despite living in the 21st century, obsolete methods for roof supports are being employed in the coal mines which is an alarming situation. In order to eliminate the above-mentioned issues so that maximum production can be achieved while considering the safety measures as well, a methodology was proposed in this research.Four classification systems, namely Rock Mass Rating (RMR), Q-system, Laubscher’s Geomechanics Classification (MRMR) and Coal Mine Roof Rating (CMRR), were employed to characterize the rock masses, estimation of support system and support pressures. The data required for empirical studies was collected through geological and engineering geological mapping, discontinuity surveys and testing of samples of rock and timber in laboratory and in the fieldas well. The main rock units in the study area were limestone, sandstone, claystone, shale, carbonaceous shale and coal. According to the results of classification systems, it is evaluated that the rock units lay in different classes i.e. limestone is very good to poor, sandstone and claystone are good to very poor, shale and carbonaceous shale are fair to extremely poor, and coal is fair to very poor. The regression analyses of scattered data were conducted in order to establish relations among the classification systems. The results obtained were quite similar to the previous researches. RMR and CMRR classification systemsrecommended the installation of bolts and shotcrete,MRMR proposed the usage of timbering for strong lithologies while Q-system ended up with unsupported reinforcement category but usage of bolts isalways emphasized upon, in order to increase the factor of safety and avoid any fatal incident.
میرے گائوں جاتا تھا جو اُس رستے کے دونوں جانب میٹھے آموں کے کچھ بوٹے اونچے سایہ دار شجر بھی کچھ شیشم کے ، کچھ پیپل کے کچھ لیموں کے چھوٹے چھوٹے
بھینی بھینی خوشبو والے کچھ پھولوں والے بوٹے بھی کچھ کانٹوں والے بوٹے بھی
جیسے کیکر ، بیری ، آڑو کچھ چمکیلے پتّوں والے پتلی لمبی شاخوں والے پر پھیلائے رستے اوپر بادل چھائے رستے اوپر گرمی میں سب کے سب گھر سے باہر آئے رستے اوپر ساجن ، متّر ، بیلی سارے روز بلائے رستے اوپر
میں جب کالج آتا جاتا چڑیوں کی چوں چوں سنتا تھا کوئل کی کُو کُو سنتا تھا بلبل بھی گانا گاتی تھی
ہجر کے ماروں کی خاطر جب وصل کے گیت ہوا بنتی تھی رنگ بہار کے اُس مٹی سے ہر دل کی دھڑکن چنتی تھی اک مدّت سے اک عرصے سے چھوٹ گیا وہ رستہ مجھ سے جو میرے گائوں جاتا تھا
هدفت الدراسة الحالية إلى التعرف على الحوكمة المؤسسية بمدارس دولة جنوب أفريقيا وإمكانية الإفادة منها بسلطنة عُمان، واتبعت الدراسة المنهج الوصفي، كما استخدمت نظرية تحليل المضمون في تحليل الوثائق في جمع البيانات والمعلومات. وتوصلت الدراسة إلى مجموعة من النتائج أهمها: حاجة المدارس في سلطنة عُمان إلى هيئة مُحددة تتولى مسؤولية الحوكمة المؤسسية في المدارس، وتضم هذه الهيئة ممثلين عن كافة المُشاركين والمستفيدين من العملية التعليمية من إدارة مدرسية ومعلمين وأخصائيين وطلبة وأولياء أمور وأعضاء مجتمع محلي، ويتم تدريب هذه الهيئة على القيام بواجبات ومسؤوليات وأدوار مُحددة، وقيام هذه الهيئة بتشكيل مجموعة من اللجان المتنوعة لدعم عملها
Peach is the second most important stone fruit crop of Pakistan after apricot. Stone fruits are characteristically soft-fleshed, high in water contents thus highly perishable and they have a limited market life potential. Fruit quality is another important aspect which is desired by the consumers and high quality fruits give high economic returns. In Pakistan not much emphasis was given to develop methodologies to get high quality than quantity. Enhancement of the fruit quality like size, color, texture and nutrient contents to high level is only possible during the growth and development in pre-harvest phase, whereas, maintenance of the fruit quality for long time is possible with better postharvest management. Preharvest factors often interact in complex ways. Peaches are climacteric fruit and are harvested at mature stage before ripening. After harvest rapid ripening in peach fruit is responsible for short shelf life and represents a serious constraint for efficient handling and transportation for local as well as for distant markets. Ripening can be slowed down by cold storage. However, cold storage life of peach is frequently limited by chilling injury (CI) and losses in quality. Peach fruits after extended cold storage present symptoms of internal breakdown (IB). These symptoms are attributed to low calcium content. The search for alternative treatments that would maintain the fruit quality for longer period to transport the fruit to distant markets is the most important issue for peach industry. On the other hand, food safety is a major concern shared by consumers, industry and governments. The present study was aimed to investigate the possible effects of different concentrations of food grade chemicals like calcium chloride (1%, 2 % and 3%), putrescine (1mM, 2 mM and 3 mM) and salicylic Acid (1 mM, 2 mM and 3 mM) during fruit growth on tree 1 2 and after harvesting the fruit to improve fruit quality and to extend the storage potential of peach fruit. The fruit was stored for six weeks at 1 ± 1 ºC with 90-95 % relative humidity. Changes in fresh weight, color, ethylene synthesis, total soluble solids, fruit firmness, sugars, total antioxidants, enzymes, ascorbic acid (vitamin C) and membrane leakage as affected by different treatments were studied. In the first experiment (Pre-harvest treatments) CaCl2 (1 % ) and Put (2 mM) treatments increased fruit weight, fruit diameter, pulp: stone ratio and yield compared to control. All treatments resulted in higher fruit firmness, acidity and ascorbic acid contents than control at harvest. Higher calcium treatments proved toxic. When these fruits were placed in cold store, the results revealed that foliar application of Put (2 mM) significantly suppressed ethylene production during storage and prolonged storage life of peach fruit. The undesirable changes in fruit firmness, TA, SSC, and concentration of ascorbic acid in the fruit flesh, were significantly slowed down by Put treatments. Development of fruit color after harvest was significantly delayed by foliar applications of Put (2 mM). Higher antioxidant enzymes (SOD, CAT, POD) activity, free radical scavenging activity and sensory evaluation was also maintained by Put (2 mM) treatment. During the second experiment where no preharvest treatment was applied rather only postharvest effect of treatments was compared, CaCl2 (2 %) concentration was proved to be the most effective in marinating the quality till the end of the storage. From present work it can be referred that spraying calcium chloride and putrescine can be equally effective in improving yield and physicochemical characteristics of peach cv. „Flordaking‟. Furthermore, it can be concluded 3 that storability of „Flordaking‟ peaches can be extended by pre-harvest Put (2 mM) treatment. While the results of the second experiment suggest that CaCl2 (2 %) treatment can be successfully used if processors get fruit which was not treated during preharvest to maintain the quality of peach fruit during storage which can be effective in marketing it to the distant areas.