检索结果-内蒙古大学图书馆

Experimental validations of the transport equation model for room‐acoustic predictions in long spaces.

The Journal of the Acoustical Society of America 2010年第3_SUPPLEMENT期127卷 2002-2002页

作者： Yun Jing Ning Xiang Graduate Program in Architectural Acoust. School of Architecture Rensselaer Polytechnic Inst. Troy NY 12180

This paper presents an experimental study on steady‐state sound pressure levels and reverberation times in a tenth long‐space scale model. The purpose of this work is to validate a recently developed one‐dimensional transport equation model for acoustic predictions in long spaces. A series of measurements has been conducted in the scale model to reveal receiver‐position dependence of measured and modeled parameters in the long spaces. Experimental results at different octave bands are obtained. This paper will compare the acoustically measured results with that of simulations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Modeling of sound fields in urban streets using a one‐dimensional transport equation model.

引用

The Journal of the Acoustical Society of America 2010年第3_SUPPLEMENT期127卷 1776-1776页

作者： Yun Jing Ning Xiang Graduate Program in Architectural Acoust. School of Architecture Rensselaer Polytechnic Inst. Troy NY 12180

This paper presents a one‐dimensional transport equation model for acoustic field predictions in urban streets. Considering urban streets as elongated enclosures, acoustic properties of the surfaces are typically quite different. For example, the top and two ends are often open and the streets are usually reflective. A recently developed one‐dimensional transport equation [Jing et al., J. Acoust. Soc. Am. 125, 2735 (2009)] is extended to model non‐uniform absorption and scattering coefficients and is applied to urban streets acoustic predictions. This paper discusses preliminary experimental results obtained from a tenth scale‐model to validate the model.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Predictions of sound energy flows in coupled spaces using a diffusion equation model.

引用

The Journal of the Acoustical Society of America 2008年第4_SUPPLEMENT期124卷 2482-2482页

作者： Yun Jing Ning Xiang Graduate Program in Architectural Acoust. School of Architecture Rensselaer Polytechnic Inst. Troy NY 12180

In this work, a diffusion equation model [J. Xiang, J. Acoust. Soc. Am., 123, 145–153 (2008)] is applied to two coupled spaces to study the time‐dependent sound energy flows through the coupling area (aperture). The energy feedback is found when the primary room is less reverberant than the secondary room. The Bayesian framework is applied to quantify double‐slope characteristics of sound‐energy flow decays obtained from the diffusion equation numerical simulations. This work also reveals that the turning point on a double‐sloped energy decay is highly correlated to the time instant when the energy flow direction flips over.

关键词：

来源：评论

学校读者我要写书评

暂无评论

CRISPR/Cas genome editing in soybean: challenges and new insights to overcome existing bottlenecks

引用

Journal of Advanced Research 2024年

作者： Freitas-Alves, Nayara Sabrina Moreira-Pinto, Clidia E. Távora, Fabiano T.P.K. Paes-de-Melo, Bruno Arraes, Fabricio B.M. Lourenço-Tessutti, Isabela T. Moura, Stéfanie M. Oliveira, Antonio C. Morgante, Carolina V. Qi, Yiping Fatima Grossi-de-Sa, Maria Embrapa Genetic Resources and Biotechnology DF Brasília Brazil Bioprocess Engineering and Biotechnology Graduate Program Federal University of Paraná (UFPR) PR Curitiba Brazil National Institute of Science and Technology INCT PlantStress Biotech EMBRAPA DF Brasília Brazil Federal University of Pelotas (UFPEL) RS Pelotas Brazil Embrapa Semi-Arid PE Petrolina Brazil Department of Plant Science and Landscape Architecture University of Maryland College Park MD United States Catholic University of Brasília Graduate Program in Genomic Sciences and Biotechnology DF Brasília Brazil Catholic University Dom Bosco Graduate Program in Biotechnology MS Campo Grande Brazil

Background: Soybean is a worldwide-cultivated crop due to its applications in the food, feed, and biodiesel industries. Genome editing in soybean began with ZFN and TALEN technologies;however, CRISPR/Cas has emerged and shortly became the preferable approach for soybean genome manipulation since it is more precise, easy to handle, and cost-effective. Recent reports have focused on the conventional Cas9 nuclease, Cas9 nickase (nCas9) derived base editors, and Cas12a (formally Cpf1) as the most commonly used genome editors in soybean. Nonetheless, several challenges in the complex plant genetic engineering pipeline need to be overcome to effectively edit the genome of an elite soybean cultivar. These challenges include (1) optimizing CRISPR cassette design (i.e., gRNA and Cas promoters, gRNA design and testing, number of gRNAs, and binary vector), (2) improving transformation frequency, (3) increasing the editing efficiency ratio of targeted plant cells, and (4) improving soybean crop production. Aim of review: This review provides an overview of soybean genome editing using CRISPR/Cas technology, discusses current challenges, and highlights theoretical (insights) and practical suggestions to overcome the existing bottlenecks. Key scientific concepts of review: The CRISPR/Cas system was discovered as part of the bacterial innate immune system. It has been used as a biotechnological tool for genome editing and efficiently applied in soybean to unveil gene function, improve agronomic traits such as yield and nutritional grain quality, and enhance biotic and abiotic stress tolerance. To date, the efficiency of gRNAs has been validated using protoplasts and hairy root assays, while stable plant transformation relies on Agrobacterium-mediated and particle bombardment methods. Nevertheless, most steps of the CRISPR/Cas workflow require optimizations to achieve a more effective genome editing in soybean plants. © 2024

关键词： Base editors Cas12a CRISPR/Cas9 Crops Genetic transformation Glycine max

来源：评论

学校读者我要写书评

暂无评论

Preservation of Nutmeg Tree (Myristica fragrans Houtt) used as Bogor's Local Culinary Ingredient for the Strengtheness of Urban Landscape Identity

引用

IOP Conference Series: Earth and Environmental Science 2020年第1期556卷

作者： Remiya Samantha Nurhayati Syartinilia Magister Program of Landscape Architecture Graduate School IPB University Bogor Indonesia 16680 Department of Landscape Architecture Faculty of Agriculture IPB University Bogor Indonesia 16680

Nutmeg tree (Myristica fragrans) is Indonesian native tree species originating from Maluku Island, especially Ambon and Banda. The spread of nutmeg in Bogor area can be traced back to the Dutch colonial period when different kinds of spices were traded across the Indonesian archipelago and beyond. Having this long history, nutmeg is now widely used in Bogor's culinary. At the national level, it has high economic value and become one of Indonesia's main export products. However, there is little research on nutmeg tree spatial distribution. The objectives of the study were : (1) identify the nutmeg trees spatial distribution in Bogor city (2) mapping the existence and identification of nutmeg trees conditions and growing environment. This research was conducted Bogor City from February - May 2018. The data was obtained through direct interview, study field, and study literature. Data collection is determined based on the distribution of nutmeg trees in Bogor City, and extinct status based on study literature. Furtehermore, the existence of nutmeg trees in Bogor collected used purposive and snowball technique. The results showed that a total of 108 nutmeg trees were found in all sub-districts of Bogor city. These trees grow in a variety of areas such as green corridor, public park, agriculture farm, riverbanks, yard, office park, and cemetery. The results of this study can be used as the basis for determining the preservation strategy and area for nutmeg conservation in Bogor city.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A binaural model for predicting speech intelligibility in rooms using noise and reverberation suppression processes

引用

The Journal of the Acoustical Society of America 2012年第4_SUPPLEMENT期131卷 3317-3317页

作者： Vanessa Li Ning Xiang Jonas Braasch Graduate Program in Architectural Acoustics School of Architecture Rensselaer Polytechnic Institute Troy New York vanessa.li@***

Conventional metrics for predicting speech intelligibility are commonly described using the speech intelligibility index (SII) and speech transmission index (STI)--both of which are calculated using a monophonic signal. Under binaural conditions, these predictors often underestimate intelligibility due to the fact that beneficial binaural cues for unmasking detrimental effects are not accounted for. Beutelmann et al. [J. Acoust. Soc. Am. 127, 2479-2497 (2010)] proposed a binaural speech intelligibility model that determines the SII after suppressing spatially-separate noise using the equalization-cancellation (EC) process. This research expands on previous work by extending the model to analyze auditory scenes with more complex room acoustics, namely reverberation. In order to account for speech intelligibility degradation in the presence of room effects, the SII calculation is replaced by the STI. The current work also incorporates binaural release from reverberation by introducing an additional reverberation suppression mechanism into the model based on interaural coherence. The use of speech intelligibility metrics as an objective form of measurement may be used as a means to further understand binaural suppression processes within various room acoustic configurations through subjective listening tests.

关键词：

来源：评论

学校读者我要写书评

暂无评论

City Limits: How Localizing Is the Key to Our Urban Future

引用

New Perspectives Quarterly 2015年第3期32卷

作者： MICHAEL SORKIN President of Terreform distinguished professor of architecture and director of the graduate program in urban design at the City College of New York.

来源：评论

学校读者我要写书评

暂无评论

Acoustic Absorption Characteristics of Perforated Thin Plate with Air Jets and Cavity

引用

Open Journal of Fluid Dynamics 2015年第1期5卷 1-9页

作者： Hiromitsu Hamakawa Hiroki Matsuoka Taiki Yamai Kenta Asakura Toru Otsuru Reiji Tomiku Eru Kurihara Hidechito Hayashi Eiichi Nishida Department of Mechanical Engineering Oita University Oita Japan Graduate School Master’s Program of Engineering Oita University Oita Japan Torishima Pump Mfg. Co. Ltd Takatsuki-shi Osaka Japan Department of Architecture Oita University Oita Japan Department of Mechanical Engineering Nagasaki University Nagasaki Japan Department of Mechanical Systems Engineering Shonan Institute of Technology Fujisawa-shi Kanagawa Japan

The present paper focuses on the effect of air jets through a perforated thin plate on the characteristics of an acoustic absorption coefficient. We measured the flow rate, internal pressure, acoustic pressure, and transfer function by using an improved acoustic impedance tube. The normal incidence absorption coefficient was calculated from the measured transfer function using transfer function methods. As a result, the frequency characteristics of the acoustic absorption coefficient against the frequency showed a maximum value at the local frequency. The peak frequency of the acoustic absorption coefficient depended on the thickness of the background air space and the thickness of the perforated plate. As the flow rate increased through the micropores, the peak level of the acoustic absorption coefficient also increased until a flow rate of 80?l /min. As the flow rate further increased, the peak level of the acoustic absorption coefficient decreased and that of the high frequency band increased.

关键词： Acoustic Absorption Coefficient Perforated Plate Cavity Micropores Air Jets Acoustic Impedance Tube

来源：评论

学校读者我要写书评

暂无评论

Sequential Action-Based Dynamic Decision-Support Model for Urban Ecological Planning

SSRN

引用

SSRN 2023年

作者： Kim, Eun Sub Yun, Seok Hwan Kim, Ji Yeon Thorne, James H. Hyun, Jung Hee Lee, Dong Kun Interdisciplinary Program in Landscape Architecture Seoul National University Seoul08826 Korea Republic of Integrated Major in Smart City Global Convergence Program Seoul National University Seoul08826 Korea Republic of Specialized Graduate School of Intelligent Eco-Science 4 Dept. of Landscape Architecture Seoul National University Seoul08826 Korea Republic of Smart Green Solution Team SK forest Department of Environmental Science and Policy University of California One Shields Ave DavisCA95616 United States Systemic Risk and Resilience Research Group Advancing Systems Analysis International Institute for Applied Systems Analysis Austria Department of Landscape Architecture and Rural System Engineering Seoul National University Seoul08826 Korea Republic of

Decision-makers often encounter the challenge of efficient long-term ecological planning to consider economic and environmental trade-offs. However, tools to support stepwise mitigation strategies that account for dynamic ecological responses to continuing urban development are limited. Therefore, we developed a sequential action-based dynamic decision-making model to simulate stepwise mitigation measures in space over time using a multi-objective optimization algorithm. We focused on exploring the ecological corridors and habitat creation as mitigation measures through four decades to identify trade-offs and optimal plans that minimize landscape connectivity and edge density as ecological responses to urban development and minimize implementation costs per action. The results showed that adopting an initial low-investment strategy with sequential planning significantly enhanced potential ecological benefits beyond the 2000s compared with one-action planning. In contrast, the initial high-cost investment exhibited a gradual decline in the ecological benefits over time from 1995. The initial low-cost investment presented an opportunity to enhance ecological benefits by implementing early mitigation measures in locations capable of sustaining long-term ecological functions. The results suggest that sequential planning offers valuable insights into effective urban ecological planning by analyzing time-series data. This study enables step-by-step scenario testing, thereby supporting the facilitation of urban and regional sustainability planning. © 2023, The Authors. All rights reserved.

关键词： Decision making

来源：评论

学校读者我要写书评

暂无评论

Altitudinal Migration of Species of Fir (Abies spp.) in Adaptation to Climate Change

引用

Water, Air, and Soil Pollution 2022年第9期233卷 385-385页

作者： Tekin, Oktay Cetin, Mehmet Varol, Tugrul Ozel, Halil Baris Sevik, Hakan Zeren Cetin, Ilknur Institute of Science and Engineering Department of Sustainable Agriculture and Natural Plant Resources Kastamonu University Kastamonu Turkey Faculty of Architecture Department of City and Regional Planning Ondokuz Mayis University Samsun Turkey Faculty of Forestry Department of Forest Engineering Bartin Turkey Faculty of Forestry Department of Forest Engineering Bartin University Bartin Turkey Faculty of Engineering and Architecture Department of Environmental Engineering Kastamonu University Kuzeykent Campus Kastamonu37150 Turkey YOK 100/2000 Scholarship Program of Sustainable Forestry Institute of Graduate School Department of Forest Engineering Bartin University Bartin Turkey Department of Park and Garden Plants Program of Landscape and Ornamental Plants Cultivation Samsun Vocational School Ondokuz Mayis University Samsun Turkey

Global climate change is considered an irreversible problem, which might directly or indirectly affect all the organisms and ecosystems on the earth and the world has to struggle with. Plants having no effective movement mechanism are the group that global climate change will affect the most. In order to minimize the species and population losses, it is important to estimate the changes in the available distribution areas of species and to ensure the migration mechanism, which the species will need, by the hand of humans. The present study aims to reveal how potential distribution areas of fir, which is among the significant tree species of Turkey and significant portion of global distribution of which is in Turkey, will change from an altitudinal aspect because of the climate change. The results achieved showed that, because of the effects of global climate change, the suitable distribution areas of Abies nordmanniana subsp. nordmanniana will significantly decrease especially at high altitudes and that suitable distribution areas of Abies nordmanniana subsp. equi-trojani will reduce at altitudes higher than 1400 m but increase generally at the altitudes between 200 and 600 m. Moreover, suitable distribution areas of Abies cilicica will shift towards higher altitudes. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Climate change

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：