Wyniki wyszukiwania - BazTech

1

Idea miasta gąbki

Mielicki Krzysztof

Zieleń Miejska

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2023

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Nr 1

12--15

PL

O tym, że natura – odkąd istnieje nasz gatunek – nie wybacza błędów w skali mikro i makro, przekonało się wielu ludzi. Obecnie, gdy światowa populacja przekroczyła oszałamiającą liczbę 8 mld osób, konsekwencje ludzkich błędów dotykają nas w masowej i globalnej skali. Doświadczyli tego Chińczycy, którzy zareagowali na to wdrażaniem koncepcji tzw. miasta gąbki.

2

Sustainable water management strategies from a historical landscape - case study of Ganzhou, China

Ge Dong Ning, Yang Yang, Fekete Albert

Teka Komisji Urbanistyki i Architektury Oddział PAN w Krakowie

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2021

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T. 49

325--332

EN

Starting from the consideration that sustainability of landscape heritage is logically coupled with today’s sustainable development needs, the research explores the general ideas, methods and strategies of ancient Chinese urban water management. Based on the traditional Chinese water management experience from the ancient city of Ganzhou, the paper - analyses the current water landscape heritage in Jiangxi Province, China. Based on the historic experience and knowledge introduced and analyzed in the case study of Ganzhou, it is possible to define rainwater management principles and sustainable development strategies for modern urban landscape that could be the basis of a new research perspective in facing today’s climate anomalies.

PL

Zaczynając od konstatacji, że zrównoważony rozwój dziedzictwa krajobrazowego jest logicznie połączony z dzisiejszymi potrzebami zrównoważonego rozwoju, badania wskazują ogólne pomysły, metody i strategie starożytnej chińskiej miejskiej gospodarki wodnej. Bazując na tradycyjnych chińskich doświadczeniach w zakresie gospodarki wodnej ze starożytnego miasta Ganzhou, artykuł analizuje obecne dziedzictwo krajobrazu wodnego w prowincji Jiangxi w Chinach. W oparciu o historyczne doświadczenie i wiedzę wprowadzoną oraz przeanalizowaną w studium przypadku Ganzhou, możliwe jest zdefiniowanie zasad zarządzania wodą deszczową i strategii zrównoważonego rozwoju dla nowoczesnego krajobrazu miejskiego, które mogłyby być podstawą nowej perspektywy badawczej w obliczu dzisiejszych anomalii klimatycznych.

3

Utilization of coconut shell residual in green roof: hydraulic and thermal properties of expansive soil amended with biochar and fbre including theoretical model

Wang Hao, Garg Ankit, Zhang Xiaoyong, Xiao Yangyang, Mei Guoxiong

Acta Geophysica

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2020

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Vol. 68, no. 6

1803--1819

EN

The study intends to explore hydraulic and thermal properties of expansive soils treated with fbre, biochar and biochar–fbre mix. Both fbre and biochar are derived from coconut shell, which is highly common in coastal regions around the world. Besides, benefts, limitations and engineering feasibility of these geomaterials in green roofs are explored. Theoretical framework for thermal–hydraulic analysis is proposed based on mass conservation and the frst law of thermodynamics. Heat capacity, thermal conductivity, water retention curve, crack intensity factor (CIF) and saturated and unsaturated hydraulic conductivities of four kinds of soils are evaluated and compared. Characterizations of geomaterials are also investigated via thermal mass loss, micro-structure, surface area and functional groups identifcation. Both biochar and fbre admixtures contribute to improvement in soil heat capacity and saturated and unsaturated hydraulic conductivities. Biochar enhances saturated and residual water contents of expansive soil by 10% and 8%, respectively. Also, biochar decreases soil thermal conductivity and CIF by 31% and 5%, respectively, while fbre decreases soil-saturated and residual water contents by 15% and 29%, respectively, and reduces soil thermal conductivity and CIF by 21% and 50%, respectively. Soil–biochar–fbre composite is also recommended due to low air-entry value, acceptable water-holding capacity and limited crack propagation. The study flls the knowledge gap of how soil thermal–hydraulic properties are afected due to biochar and/or fbre admixture. It is recommended to pay more attention on production and utilization of biochar derived from coconut shell currently utilized for fbre extraction.

4

Mechanism of compacted biochar amended expansive clay subjected to drying–wetting cycles: simultaneous investigation of hydraulic and mechanical properties

Wang Hao, Garg Ankit, Huang Shan, Mei Guoxiong

Acta Geophysica

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2020

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Vol. 68, no. 3

737--749

EN

Biochar has been extensively studied in the aspect of amendment of compacted sandy/clayed soils, whereas its application as amendment in expansive soil is rare. Hydraulic and mechanical properties of biochar-amended expansive soil especially impacts of drying–wetting cycles have been rarely investigated. Aiming at construction of sponge city, straw biochar-amended expansive soil and the control soil (i.e., without biochar) are subjected to drying–wetting cycles in this study. During drying–wetting cycles, energy-dispersive spectrometer and Fourier transform infrared (FTIR) spectroscopy analyses were conducted to investigate microchemical composition including. Pore size distribution and microstructure were measured using nitrogen gas-adsorption technique and scanning electron microscope, respectively. Further, changes in soil water retention curve, void ratio, crack intensity factor (CIF, i.e., ratio of cracked section area to the total soil area) and shear strength were also determined. It is found that there is no diference in water retention capacity between various soils for near-saturated samples. Under high suction, however, more water could be retained within mesopores of biochar-amended soil. FTIR analysis indicates that biochar-amended expansive soil shows stronger chemical bonding, irrespective of them being subjected to drying–wetting cycles. The weak alkalinity of straw biochar results from its main chemical composition (i.e., calcium carbonate). It is noteworthy that straw biochar improves soil water retention capacity, which further restrains desiccation cracks. Cohesion of biochar–soil composite is also improved due to chemical bonding. Aiming at green roofs, straw biochar could be promising option for expansive soil amendment technically and economically.