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متن کامل


نویسندگان: 

Hanaee Toktam | Farhangdoust Hadi

اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    11
  • شماره: 

    2
  • صفحات: 

    133-152
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    202
  • دانلود: 

    30
چکیده: 

ABSTRACT The attention of contemporary planners to environmental factors and increasing awareness and communication of man with his surrounding environment has increased the layers and defining factors of design and planning concepts. In such a way, a common problem with the issue of environmental capabilities to respond was put in front of the planners. The collection of ideas presented in this era was in the form of responsive planning, focusing on the maximum use of environmental capabilities. The necessity of the emergence of a comprehensive discourse to overcome the plurality of factors, definitions and design methods in the environmental fields has been given less attention. Based on this, the current research aims to organize the leading theories in this field in a targeted manner and seeks to improve them based on their synergy. The structural question of this research is the meanings, examples and meaningful contexts of flexibility in various aspects and scales of urban planning. The research method used is qualitative thematic analysis with the help of artificial intelligence in MAXQDA software in a 6-step processing process. The important application of this research is to structure the minds of the planners of this field to reduce the scattered and interdisciplinary problems of the resources. The results of this research revealed dimensions such as identification and recognizability, diversity and changeability, adaptability and expandability, distribution, separation and continuity, organization and compatibility in the field of flexibility and related to the corresponding parts in urban planning   Extended Abstract Introduction Responsiveness-based design and planning emphasizing the maximum use of environmental capacities to meet users' needs implicitly cause a targeted improvement of environmental quality. As the environmental awareness of contemporary man has expanded and the platforms have become more diverse, many challenges are raised in the field of environment-oriented in the field of infrastructure quality and service provision. Urban developments and new developments in cities should be interpreted with integrated conceptualization. The conceptualization of interpretive flexibility in the planning and designing of public spaces in the city is used as an interdisciplinary perspective in urban space design to open and discuss its connection and potential as an approach to strengthening social cohesion and inclusion. The general definition of flexibility is that it can create places with new forms of meaning and be used for different groups to strengthen its coherence and multidisciplinary inclusion in terms of design and planning of space and body. On this basis, the concept of flexibility is proposed as a principle in the context of design and planning due to its wide range of effects on background phenomena. The history of such a role can be seen in the diversity of users' needs. In such a way, it is impossible to express the specific time and area of the need to pay attention to this concept. This is in line with Oldenburg's theory of "social public spaces," in which being in public space, communicating with people and the environment through observing the streets, sidewalks, squares, and parks of the city is a necessary step for people as a part of their social life. The meaningfulness of the design of the artificial environment was considered. In any case, in the contemporary era, on the one hand, at the same time as the quantitative and qualitative increase of human environmental awareness, there is no longer any phenomenon in the eyes of contemporary man arising from a unique aspect and range of factors. On the other hand, his life needs in the individual and collective dimensions have seen a high diversity, which has led to the formation of multiple semantic domains of past flexibility. The meaning of flexibility in such an interdisciplinary platform and basic design refers to the concept of understanding and responding quickly and efficiently to environmental changes. Such a holistic definition for this broad field of environmental design means the implicit acceptance of the role of scale in the meaningful domain of these concepts. On a macro scale, it means making design options to increase the presence, participation, and power of choices of users of the environment in participatory urban planning and design methods, and on a small scale, it means making design options to increase spatial quality and, as a result, the quality of activities. The daily activities of environmental users are through selection against the "dominant space." Flexibility at different scales is crucial for dimensional optimization, shaping, and structuring spatial features, leading to improved performance of space components and spaces. The development of the concept of "flexibility" from various studies in metropolitan to micro scales, such as interior architecture, allows it to pass the discourse of responsiveness to provide a broad approach to environmental design in which different values, interests, and priorities are prioritized. As a result, the issue of flexibility in environmental design has been raised as a multi-dimensional field in the design and planning of the basic environment. The breadth and complexity of this concept have made the researchers of this field deal with it in one or more ways, and it has been avoided to provide a comprehensive framework about the nature and structuring processes. The current research presents a structured view of flexibility in architecture and urban planning with an environmental approach.   Methodology The methodology to achieve this goal is to use the macro research method and achieve a comprehensive framework by combining categorized interpretations. In such a way that by sorting and categorizing these concepts and bases in a new way, he has found a new level of theoretical findings, which will be a suitable answer for the gaps in scientific knowledge and scientific methods created in this field. In this context, the research method "thematic analysis" has been used with a qualitative approach and the use of library resources. Also, to overcome the breadth and complexity of these concepts and the multi-layer networking of concepts in this research method, artificial intelligence has been used in MAXQDA research assistance software.   Results and discussion In the meantime, attention should also be paid to the fields of influence and application of the results of this research because designers refer to flexibility as the creator of environmental qualities, including dynamism. Also, since flexibility, along with the principles of readability and adaptability, affect the lifestyle and behavioral patterns of the audience of environmental design in architecture and urban planning, it will also be effective in dealing with the challenge of complexity in environmental design factors. One of the key questions for achieving research goals on this issue is how flexibility in environmental design impacts the relationship between flexibility and scale.   Conclusion The most important finding of this research suggests that first, it requires a focus on the conditions under which the processes of perceiving human abilities and discovering the needs of the human audience can manifest. The theoretical framework arises from a comparative approach between design disciplines. These conditions are independent of the final state of the design product, and strengthening the environmental capacities will lead to a direction and an area that includes environmental flexibility. By responding to new situations, the construction of the space and the body within a space building can be adapted to various configurations. Even though the environment may remain constant, the designed place will continue functioning as a strong living system over time.  It also seems that the nature of issues related to flexibility has complexity. Considering that the quality of flexibility in urban planning and architecture is significant in multilevel and multifaceted scales from micro to macro, it is important to pay attention to the scale of different variables. In order to reduce this problem, the consistency and adjustment of the scale of the variables measured in a specific analysis should be considered in the first step.   Funding There is no funding support.   Authors’ Contribution All of the authors approved the content of the manuscript and agreed on all aspects of the work.   Conflict of Interest Authors declared no conflict of interest.   Acknowledgments We are grateful to all the scientific.

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نشریه: 

مهندسی معدن

اطلاعات دوره: 
  • سال: 

    1403
  • دوره: 

    19
  • شماره: 

    62
  • صفحات: 

    117-153
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    58
  • دانلود: 

    0
چکیده: 

ذخایر معدنی نزدیک به سطح با گسترش عمقی و شیب زیاد، قابلیت استخراج با روش روباز، زیرزمینی و یا ترکیبی از این دو روش را دارد. گذار از معدن روباز به زیرزمینی یکی از مسایل چالش برانگیز مهندسی معدن است. معادنی که قابلیت گذار را دارند، در نهایت به یک نقطه گذار می رسند که در آن باید تصمیم گیری شود که آیا کاواک گسترش یابد یا به استخراج زیرزمینی تغییر روش دهند. مهم ترین مساله در این حالت تعیین "عمق بهینه گذار از استخراج روباز به زیرزمینی" است. هدف اصلی این تحقیق ارایه روش بهینه سازی برای گزینه های استخراج ترکیبی و برنامه ریزی گذار بر اساس مدل برنامه ریزی خطی عدد صحیح مختلط (MILP) است. نتیجه نهایی حاصل از به کارگیری MILP، تعیین عمق و زمان بهینه گذار و زمان بندی استخراج با هدف بیشینه سازی ارزش خالص فعلی است. بستر برنامه نویسی پایتون و متلب برای اجرای MILP انتخاب و یک حل کننده بهینه سازی تقسیم و غلبه در مقیاس بزرگ برای این تحقیق ارایه شد. ارزیابی معدن مس سونگون با استفاده از مدل MILP برای دو حالت با در نظر گرفتن هزینه های زیست محیطی و بدون در نظر گرفتن هزینه های زیست محیطی انجام شد. نتایج ارزیابی نشان داد که در حالت اول عمق گذار (5/887 متر یا 71 افق) کمتر از حالتی است که هزینه های زیست محیطی لحاظ نمی شود (950 متر یا 76 افق). با بررسی هر دو حالت، تغییری در عمر معدن مشاهده نشد. MILP معدن مس سونگون را برای استخراج ترکیبی متوالی (غیرهمزمان) در طول عمر 13 سال برنامه ریزی کرد. ارزش خالص فعلی حاصل از اجرای MILP، 7/51 میلیارد دلار و نسبت باطله برداری کلی استخراج روباز برای استخراج ترکیبی در حالت اول 64/1 حاصل شد. تجزیه و تحلیل نتایج نشان داد که MILP از استخراج باطله های بیش از حد برای دسترسی به کانسنگ با تغییر از گزینه روباز به زیرزمینی جلوگیری و عمر معدن، زمان دسترسی به منابع مالی و بازگشت سرمایه را کاهش می دهد. نتایج تجزیه و تحلیل حساسیت نشان داد که ارزش خالص فعلی مدل MILP بیش ترین حساسیت را به ترتیب نسبت به تغییرات قیمت مس، هزینه های استخراج و هزینه های زیست محیطی نشان داد. .

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نویسندگان: 

نشریه: 

DISABILITY AND SOCIETY

اطلاعات دوره: 
  • سال: 

    2020
  • دوره: 

    58
  • شماره: 

    25
  • صفحات: 

    1-23
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    53
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 53

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نویسندگان: 

Soltani Khaboushan a. | Osanloo m.

اطلاعات دوره: 
  • سال: 

    2019
  • دوره: 

    32
  • شماره: 

    8 (TRANSACTIONS B: Applications)
  • صفحات: 

    1218-1224
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    146
  • دانلود: 

    0
چکیده: 

There are some large scale orebodies that extend from surface to the extreme Depths of the ground. Such orebodies should be extracted by a combination of surface and underground mining methods. Economically, it is highly important to know the limit of upper and lower mining activities. This concern leads the mine designers to the Transition problem, which is one of the most complicated problems in mining industry. The Transition problem is categorized as a strategic one and is formulated in the form of long-term production scheduling problems. This implies that the Transition problem is highly affected by the uncertainties that are rooted in the quantity and quality of an explored orebody. The current study aims to evaluate the effects of geological uncertainty on Transition Depth. To this aim, an integer programming (IP) model was executed on different simulations of an orebody. The results indicate that the net present value (NPV) of the deterministic solution is greater than that of the basic alternative. However, the uncertainty-based solutions show that the NPV of the whole mining operation is lower than the basic and deterministic solutions mostly (more than 72% of the simulations). Nevertheless, there are some rare cases in which the NPV of the operation may increase ideally up to 2. 5 % due to development of the pit bottom downward. Finally, because of a negligible difference between the average NPV of the simulations and that of basic alternative, it is expected that the primitive pit bottom would play the role of Transition Depth.

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نویسندگان: 

صیادی ابوالقاسم

اطلاعات دوره: 
  • سال: 

    1388
  • دوره: 

    1
  • شماره: 

    1
  • صفحات: 

    77-86
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    937
  • دانلود: 

    162
چکیده: 

یک شبیه ریاضی دو بعدی برای محاسبه آبشستگی موضعی در اطراف پایه پل ها تهیه گردیده است. از معادله ناویر - استوکس، به عنوان معادله ای که میدان سرعت را شبیه سازی می کند، استفاده شده است. در ابتدا معادله ناویر - استوکس حل شده و میدان سرعت بدست آمد. سپس از سرعت های بدست آمده در صفحه افقی، به عنوان داده های ورودی در حل معادله انتقال رسوب و از روش معیار باقیمانده های وزنی گالرکین، برای مرتب کردن تغییرات معادله های ناویر - استوکس استفاده شد. دامنه مورد بررسی به هشت واحد گرهی تقسیم گردید و از توابع مرتبه دوم برای سرعت ها و خطی برای فشار، استفاده شد. پس از حل معادله انتقال رسوب با داشتن غلظت های اولیه و نهایی، عمق آبشستگی محاسبه و جواب های شبیه با مقادیر اندازه گرفته شده آزمایشگاهی و بر اساس شبیهی که از حل معادله لاپلاس با روش تفاضل محدود بدست آمده بود، مقایسه گردید. در عمل، جواب های حاصل انطباق خوبی را با مقادیر اندازه گرفته شده نشان می دهند. در آخر، تاثیر عامل های گوناگون مثل عمق جریان، شیب کف رودخانه، میانگین اندازه ذرات و... بر عمق آبشستگی بررسی شد. نمودارهای مربوط به بررسی اثر عامل های گوناگون با عمق آبشستگی بر عمق جریان و مقایسه آن ها با نتایج بدست آمده از حل معادله های بالا با روش اختلافات محدود، و مقادیر تعیین گردیده در انتهای مقاله آورده شده است که انطباق خوبی را نشان می دهند.

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اطلاعات دوره: 
  • سال: 

    1392
  • دوره: 

    1
تعامل: 
  • بازدید: 

    408
  • دانلود: 

    159
چکیده: 

لطفا برای مشاهده چکیده به متن کامل (pdf) مراجعه فرمایید.

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اطلاعات دوره: 
  • سال: 

    2024
  • دوره: 

    58
  • شماره: 

    4
  • صفحات: 

    439-444
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    9
  • دانلود: 

    0
چکیده: 

Block caving method is the most suitable underground mining method for metal deposits that have reached their Transition Depth. The stability of the pit floor and slopes of these mines is critical to ensure safety and prevent damage to surface infrastructure. In this paper, the process of block caving under the open pit mine is modeled by numerical simulation using Phase 2 software. The effect of undercut Depth on the caving height and the thickness of the remaining crown pillar under the pit was investigated. The undercut was modeled at 200, 600, and 1000 meters below the pit floor. The results show that the height of the caving increases with increasing Depth of the undercut. The maximum cave span also increases with the increment in Depth. Also, as the Depth increases from 200 to 600 meters, the thickness of the crown pillar increases five-fold, whereas by increasing the Depth of undercutting from 600 to 1000 meters, the thickness of the crown pillar doubles. In addition, the ratio of the crown pillar thickness to the maximum caving span decreases as the Depth of undercut increases. At Depth of 200 meters to 600 meters, the mentioned ratio decreases severely; however, for Depths between 600 meters and 1000 meters, the ratio decreases gradually.

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نویسندگان: 

KHANNA D.R. | BHUTIANI R. | CHANDRA K.S.

اطلاعات دوره: 
  • سال: 

    2009
  • دوره: 

    3
  • شماره: 

    2
  • صفحات: 

    223-228
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    610
  • دانلود: 

    0
چکیده: 

Light is never being distributed homogeneously and it forms a gradient over biomass. The unidirectional nature of light gives rise to a vertical gradient of light intensity as a function of Depth. The maximum Depth of the light zone suitable for phytoplankton photosynthesis is designated as the euphotic Depth. This study was designed to test the hypothesis of mixing Depth of phytoplankton and its compensation Depth. In a water column undergoing turbulent mixing, where phytoplankton cells are around by the fluid motion, the irradiance encountered by cells will be a function of the ratio between the euphotic Depth (zy) and the Depth of mixing (zm). During the course of study the zy/zm ratio value were observed in the range of 0.4427 to 3.242. However, identification of Compensation point values for zy/zm indicates that light conditions are suitable for net phytoplankton production, because the mean value (0.3413) was good for the phytoplanktonic growth, which was greater than the minimum 0.20 limit.

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نویسندگان: 

Qasemi Firouzabadi Narges | Rahimi Sayyidah Vahideh | Rahman Setayesh Muhammad Kazem

اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    20
  • شماره: 

    37
  • صفحات: 

    239-268
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    170
  • دانلود: 

    17
چکیده: 

How to profoundly change the beliefs of the polytheists during the age of revelation from the denial of the Prophet (pbuh) to the certainty of his Message and the acceptance of his full guardianship is a question worthy of attention. The order of verses about prophecy based on the order of revelation is the reason to lead a transformative process and a special Quranic method in institutionalizing the belief of prophecy in the lives of Arabs. In the first stage, the Holy Quran in the first Makkī (Arabic: المکّیّ, suras revealed in Mecca) chapters has prepared the community from the motivational side to accept the truth of the Prophet’s (pbuh) prophecy and briefly stating the key issues surrounding it. The Holy Book of Quran at the time of the emergence of oppositions and doubts (the second stage) destroyed the arguments of the polytheists and explained the prophecy and proved its authenticity from a cognitive perspective in the second stage by presenting clear arguments. and the Holy Book of Quran in the third stage after Madanī (Arabic: المدنیّ, suras revealed in Medina) period has undertaken measures in order to fulfill the goals of the Massage by explaining the true position of the Prophet (pbuh) to deepen and operationalize the Prophetic belief through explaining practical duties for the Prophet (pbuh) and behavior based on the acceptance of Walaya (Arabic: ولایة, meaning “guardianship” or “governance”).

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نویسندگان: 

KHAN M.S. | SENHADJI A.S. | SMITH B.D.

نشریه: 

MACROECONOMIC DYNAMICS

اطلاعات دوره: 
  • سال: 

    2006
  • دوره: 

    10
  • شماره: 

    -
  • صفحات: 

    165-182
تعامل: 
  • استنادات: 

    2
  • بازدید: 

    171
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 171

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