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汶川巨震的预测和思考

耿庆国

《中国工程科学》 2009年 第11卷 第6期   页码 123-128

摘要:

根据多年来对旱震关系、强震活动有序性及强磁暴组合法的地震预测探索,就川、甘、青、陕,特别是四川阿坝州地区的地震活动连续3年的研究做了简要的回顾,披露了在汶川地震前的2005 年12 月8 日向中国地震局提交的“关于加强川甘青交界地区强震短临监测和分析预报应急工作的紧急建议”要点。

关键词: 汶川巨震预测     旱震关系     强震活动有序性     强磁暴组合法    

Features of seismic hazard in large dam projects and strong motion monitoring of large dams

Martin WIELAND,

《结构与土木工程前沿(英文)》 2010年 第4卷 第1期   页码 56-64 doi: 10.1007/s11709-010-0005-6

摘要: Earthquakes can affect large dam projects in many different ways. Usually, design engineers are focussing on ground shaking and neglect the other aspects. The May 12, 2008 Wenchuan earthquake has damaged 1803 dams and reservoirs, and 403 hydropower plants with an installed capacity of 3.3GW. Among these dams were the 132-m-high Shapai RCC arch dam and the 156-m-high Zipingpu concrete face rockfill dam. These recently completed dams are dam types which, up to now, have not experienced strong ground shaking. The widespread mass movements have caused substantial damage to dams and surface powerhouses in Sichuan. The different features of earthquake hazard are presented, i.e., ground shaking, faulting and mass movements. It is proposed to prepare project-specific safety plans for all dams, which consist of a matrix where the possible hazards and the corresponding countermeasures are listed. The earthquake behaviors of the Sefid Rud, Zipingpu and Shapai dams, which, in the past, have experienced strong ground shaking from nearby earthquakes, are discussed. Finally, the need for strong motion instrumentation of large dams is discussed. It is proposed that major dams with large damage potential, dams located in areas of high seismicity, and dams showing signs of abnormal behavior be equipped with strong motion instruments.

关键词: seismic hazard     arch dam     concrete face rockfill dam     strong motion instrumentation     reservoir-triggered seismicity     Wenchuan earthquake    

Seismic design of high-rise towers for cable-stayed bridges under strong earthquakes

Yan XU, Shide HU

《结构与土木工程前沿(英文)》 2011年 第5卷 第4期   页码 451-457 doi: 10.1007/s11709-011-0127-5

摘要: This paper presents the first of a series of studies on the seismic design of high-rise towers for cable-stayed bridges under strong earthquakes. One practical cable-stayed bridge with a 730 m long main span and two high-rise towers over 200 m in height was selected for this study. The preliminary results show that compared with piers, the tower is more vulnerable to pulse-like earthquakes, and it may develop plasticity at certain locations. In addition, viscous dampers may not have the same effect during pulse-like earthquakes as they do under site-specific earthquakes. Hence, reoptimization of damper parameters or reconsideration of other energy dissipation devices will be needed if strong earthquakes are likely to occur.

关键词: high-rise tower     cable-stayed bridge     strong earthquake     seismic design    

应坚持地震是可以预测预报的科学信念——记汶川三次强余震的成功预测

汪成民

《中国工程科学》 2009年 第11卷 第6期   页码 107-110

摘要:

地震能否预测? 汶川大震后地震系统内、社会舆论对这个焦点问题给予了广泛关注及争论。汶川地震后,中国地震预测咨询委员会的专家们就汶川余震开展了预测研究,以实际行动支援灾区救灾抢险工作,从5月15日至8月15日咨询委员会发布了3次正式预测意见,均正确预报了5 月18 日江油6.0级、5月25日青川6.4 级、8月1日北川6.1级3次强余震。虽然余震预测难度比主震预测要小,但3次预测全部正确,无一虚报、错报的科学事实,应该引起持“地震预测需十几代、几十代后才能解决”观点者醒悟,呼吁对地震成功预测的事实持不屑一顾,甚至压制者深思,并认真给予公平对待。

关键词: 汶川大震     汶川余震     地震短临预测    

强震成功预报的曙光

李玶,杨美娥

《中国工程科学》 2009年 第11卷 第6期   页码 19-27

摘要: 20世纪50年代以来,我国30多次成功预报了中、强地震的发生;近20年来国外有些地震学家对几次强震预测失败感到失望,逐渐将地震研究的主攻方向转变为对建筑物抗震能力的鉴定、加强建筑物抗震措施和建立现代数字台网,以便迅速准确确定强震的发生地点,可以即刻到现场救援;国内地震界部分地震学家受他们的悲观情绪的影响,也放弃了对强震预报的努力。所幸的是部分专业和业余地震学家仍在强震预报领域做出了不懈的努力,取得了可喜的成绩。

关键词: 汶川地震     强震预报     强震发生断层    

青藏北块M≥7强震有序网络结构与汶川8级大震预测回顾

门可佩

《中国工程科学》 2009年 第11卷 第6期   页码 82-88

摘要:

自1700年以来,青藏北块地区M≥7强震具有显著的有序性,其主要有序值为53~54 a,26~27 a,11~12 a与3~4 a等。根据翁文波信息预测理论,运用自组织网络技术构建本区7级强震信息有序网络结构,努力探索具有中国特色自主创新的强震中长期预测方法。据此有序网络结构,可对2008年汶川8级大震进行预测和分析。此外,还讨论了汶川大震的成因,同时对本区未来7级以上强震提出预测意见:2012,2016,2027年前后本区仍有可能发生7级左右强震。研究结果表明:强震和强震链是可以预测的,强震活动所呈现出的网络特性很可能是大地震形成的一种机制。笔者提出的有序网络方法,对于强震的中长期跨越式(特别是长时间、长距离)预测具有独特的效果,可为建立我国早期强震预警系统提供有效工具。

关键词: 青藏北块     信息有序网络结构     汶川大震     强震预测    

<strong>FESEstrong><strong>’s Best Papers of 2017strong>

《环境科学与工程前沿(英文)》 2018年 第12卷 第3期 doi: 10.1007/s11783-018-1051-x

<strong>Photosynthesis and related metabolic mechanism of promoted rice (strong><strong>Oryza sativastrong><strong> L.) growth by TiOstrong><strong>2strong><strong> nanoparticlesstrong>

Yingdan Zhang, Na Liu, Wei Wang, Jianteng Sun, Lizhong Zhu

《环境科学与工程前沿(英文)》 2020年 第14卷 第6期 doi: 10.1007/s11783-020-1282-5

摘要: Abstract • The rice growth was promoted by nano-TiO2 of 0.1–100 mg/L. • Nano-TiO2 enhanced the energy storage in photosynthesis. • Nano-TiO2 reduced energy consumption in carbohydrate metabolism and TCA cycle. Titanium dioxide nanoparticle (nano-TiO2), as an excellent UV absorbent and photo-catalyst, has been widely applied in modern industry, thus inevitably discharged into environment. We proposed that nano-TiO2 in soil can promote crop yield through photosynthetic and metabolic disturbance, therefore, we investigated the effects of nano-TiO2 exposure on related physiologic-biochemical properties of rice (Oryza sativa L.). Results showed that rice biomass was increased >30% at every applied dosage (0.1–100 mg/L) of nano-TiO2. The actual photosynthetic rate (Y(II)) significantly increased by 10.0% and 17.2% in the treatments of 10 and 100 mg/L respectively, indicating an increased energy production from photosynthesis. Besides, non-photochemical quenching (Y(NPQ)) significantly decreased by 19.8%–26.0% of the control in all treatments respectively, representing a decline in heat dissipation. Detailed metabolism fingerprinting further revealed that a fortified transformation of monosaccharides (D-fructose, D-galactose, and D-talose) to disaccharides (D-cellobiose, and D-lactose) was accompanied with a weakened citric acid cycle, confirming the decrease of energy consumption in metabolism. All these results elucidated that nano-TiO2 promoted rice growth through the upregulation of energy storage in photosynthesis and the downregulation of energy consumption in metabolism. This study provides a mechanistic understanding of the stress-response hormesis of rice after exposure to nano-TiO2, and provides worthy information on the potential application and risk of nanomaterials in agricultural production.

关键词: Nano-TiO2     Rice     Photosynthesis     Metabolomics     Energy storage    

大尺度地层内的分层运动

许绍燮

《中国工程科学》 2006年 第8卷 第6期   页码 14-22

摘要:

报告了观察到大尺度地层内分层运动的新发现,以及大尺度层块活动的直接证据——大尺度地层垂向同步运动,其层块的尺度可大到数千公里洲际尺度。分析了我国超长周期(360~3000s)地震监测台站记录中的层块活动局域性高强颤振事件。发现格尔木台(2001年11月份)记录到的高强颤振事件与发生在其附近(2001.11.14)昆仑山口西M8.1大震有一定关系。这些信息对于探索地震预测,以及认识大地构造动力具有重要意义。

关键词: 大尺度地层内的分层运动     高强颤振事件     地震预测    

<strong>Adsorption characteristics of ciprofloxacin onto g-MoSstrong><strong>2strong><strong> coated biochar nanocompositesstrong>

Zhenyu Yang, Rong Xing, Wenjun Zhou, Lizhong Zhu

《环境科学与工程前沿(英文)》 2020年 第14卷 第3期 doi: 10.1007/s11783-019-1218-0

摘要: The g-MoS2 coated composites (g-MoS2-BC) were synthesized. The coated g-MoS2 greatly increased the adsorption ability of biochar. The synergistic effect was observed for CIP adsorption on g-MoS2-RC700. The adsorption mechanisms of CIP on g-MoS2-BC were proposed. The g-MoS2 coated biochar (g-MoS2-BC) composites were synthesized by coating original biochar with g-MoS2 nanosheets at 300°C(BC300)/700°C (BC700). The adsorption properties of the g-MoS2-BC composites for ciprofloxacin (CIP) were investigated with an aim to exploit its high efficiency toward soil amendment. The specific surface area and the pore structures of biochar coated g-MoS2 nanosheets were significantly increased. The g-MoS2-BC composites provided more π electrons, which was favorable in enhancing the π-π electron donor-acceptor (EDA) interactions between CIP and biochar. As a result, the g-MoS2-BC composites showed faster adsorption rate and greater adsorption capacity for CIP than the original biochar. The coated g-MoS2 nanosheets contributed more to CIP adsorption on the g-MoS2-BC composites due to their greater CIP adsorption capacity than the original biochar. Moreover, the synergistic effect was observed for CIP adsorption on g-MoS2-BC700, and suppression effect on g-MoS2-BC300. In addition, the adsorption of CIP onto g-MoS2-BC composites also exhibited strong dependence on the solution pH, since it can affect both the adsorbent surface charge and the speciation of contaminants. It was reasonably suggested that the mechanisms of CIP adsorption on g-MoS2-BC composites involved pore-filling effects, π-π EDA interaction, electrostatic interaction, and ion exchange interaction. These results are useful for the modification of biochar in exploiting the novel amendment for contaminated soils.

关键词: Adsorption     Ciprofloxacin     g-MoS2 nanosheets     Biochar     Soil remediation    

<strong>A newly defined dioxygenase system from strong><strong>Mycobacterium vanbaaleniistrong><strong> PYR-1 endowed with an enhanced activity of dihydroxylation of high-molecular-weight polyaromatichydrocarbonsstrong>

Yiquan Wu, Ying Xu, Ningyi Zhou

《环境科学与工程前沿(英文)》 2020年 第14卷 第1期 doi: 10.1007/s11783-019-1193-5

摘要: • Mycobacterium vanbaalenii PYR-1 utilizes PAHs at different rates. • Both NidA3B3 and FNidA3B3 catalyze high-molecular-weight PAHs dihydroxylation. • NidA3B3 shows an enhanced activity with an endogenous electron transport chain. • FNidA3B3 has an enhanced activity by 50% approximately compared with NidA3B3. • FNidA3B3/NidA3B3 and NidAB in the same strain come from different ancestors. NidA3B3 is a terminal dioxygenase whose favorable substrates are high-molecular-weight polyaromatic hydrocarbons (PAHs) from Mycobacterium vanbaalenii PYR-1, a powerful PAHs degradation strain. NidA3B3 was reported to incorporate a dioxygen into the benzene ring of PAHs when equipped with an exogenous electron transport chain components PhdCD from Nocardioides sp. strain KP7 by biotransformation, but this enzyme system was not particularly efficient. In this study, strain PYR-1 was confirmed to utilize four different PAHs at different growth rates. When PhtAcAd, an endogenous electron transport chain of a phthalate dioxygenase system, was substituted for PhdCD to couple with NidA3B3, the specific activity to convert phenanthrene by strain BL21(DE3) [pNidA3B3-PhAcAd] was 0.15±0.03 U/mg, but the specific activity of strain BL21(DE3) [pNidA3B3-PhdCD] was only 0.025±0.006 U/mg. In addition, FNidA3, encoded by a newly defined ORF, has a prolonged 19-amino acid sequence at the N-terminal compared with NidA3. FNidA3B3 increased the activity by 50% approximately than NidA3B3 when using PhtAcAd. Components of the electron transport chain PhtAc and PhtAd were purified and characterized. The Km, kcat, kcat/Km values of the PhtAd were 123±26.9 M, 503±49.9 min−1, 4.1 M−1·min−1, respectively. And the Km, kcat, kcat/Km values of the ferredoxin PhtAc were 52.5±9.7 M, 3.8±0.19 min−1 and 0.07 M−1·min−1, respectively. Basing on the phylogenetic analysis, NidA3/FNidA3 were far from its isoenzyme NidA from the same strain. Combining their primary differences of transcriptional pattern in vivo, it indicated that the functionally similar Rieske dioxygenases NidA3B3/FNidA3B3 and NidAB might originate from different ancestors.

关键词: Biodegradation     polyaromatic hydrocarbons     biotransformation     ring-hydroxylating dioxygenase system    

<strong>Fabrication and photocatalytic ability of an Au/TiOstrong><strong>2strong><strong>/reduced graphene oxide nanocompositestrong>

Fenghe Lv, Hua Wang, Zhangliang Li, Qi Zhang, Xuan Liu, Yan Su

《环境科学与工程前沿(英文)》 2018年 第12卷 第1期 doi: 10.1007/s11783-017-0977-8

摘要: A new type of Au/TiO /reduced graphene oxide (RGO) nanocomposite was fabricated by the hydrothermal synthesis of TiO on graphene oxide followed by the photodeposition of Au nanoparticles. Transmission electron microscopy images showed that Au nanoparticles were loaded onto the surface of both TiO and RGO. Au/TiO /RGO had a better photocatalytic activity than Au/TiO for the degradation of phenol. Electrochemical measurements indicated that Au/TiO /RGO had an improved charge transfer capability. Meanwhile, chemiluminescent analysis and electron spin resonance spectroscopy revealed that Au/TiO /RGO displayed high production of hydrogen peroxide and hydroxyl radicals in the photocatalytic process. This high photocatalytic performance was achieved via the addition of RGO in Au/TiO /RGO, where RGO served not only as a catalyst support to provide more sites for the deposition of Au nanoparticles but also as a collector to accept electrons from TiO to effectively reduce photogenerated charge recombination.

关键词: Reduced graphene oxide     Au     TiO2     Nanocomposite     Photocatalysis    

<strong>Effects of cultivation strategies on the cultivation of strong><strong>Chlorellastrong><strong> sp.HQ in photoreactorsstrong>

Xiaoya Liu, Yu Hong, Peirui Liu, Jingjing Zhan, Ran Yan

《环境科学与工程前沿(英文)》 2019年 第13卷 第5期 doi: 10.1007/s11783-019-1162-z

摘要: Heterotrophic cultivation caused high level of ROS and high lipids accumulation. HMTC is the best culture strategy for improving the microalgal biomass. Chlorella sp. HQ had great nutrient removal capacity under five culture strategies. The effects of cultivation strategies (including autotrophic cultivation (AC), heterotrophic cultivation (HC), fed-batch cultivation (FC), heterotrophic+ autotrophic two-stage cultivation (HATC), and heterotrophic+ mixotrophic two-stage cultivation (HMTC)) on the growth and lipid accumulation of Chlorella sp. HQ and its total nitrogen (TN) and total phosphorus (TP) removal in secondary effluent were investigated in column photoreactors. The results showed that the TN and TP removal rates ranged between 93.72%–95.82% and 92.73%–100%, respectively, under the five different strategies. The microalgal growth potential evaluated by the maximal growth rate (Rmax) was in the order of HMTC>HC>FC>AC>HATC. The values of biomass, total lipid yield, triacylglycerols (TAGs) yield, and total lipid content of the microalga cultivated in the last 5 d increased significantly, but the TAGs productivities of the five strategies were lower than those in the first 7 d. Compared with all the other cultivation strategies, the TAGs productivity and yield after 12 d of cultivation under the heterotrophic condition reached the highest values accompanying the highest level of intracellular reactive oxygen species (ROS), in which the TAGs yield reached 40.81 mg/L at the end of the cultivation period. The peaks in TAGs yield and ROS level suggested that HC was beneficial for lipids accumulation via regulating the cellular redox status and exerting ROS stress on microalgal cells. In summary, HMTC was the best cultivation strategy for improving the microalgal biomass and HC was the best strategy for microalgal TAGs accumulation to produce biodiesel.

关键词: Chlorella sp. HQ     Cultivation strategy     lipids     Nitrogen removal     Phosphorus removal     Reactive oxygen species    

<strong>Forward osmosis coupled with lime-soda ash softening for volume minimization of reverse osmosisconcentrate and CaCOstrong><strong>3strong><strong> recovery: A case study on the coalchemical industrystrong>

Jiandong Lu, Shijie You, Xiuheng Wang

《环境科学与工程前沿(英文)》 2021年 第15卷 第1期 doi: 10.1007/s11783-020-1301-6

摘要: Abstract • Forward osmosis (FO) coupled with chemical softening for CCI ROC minimization • Effective removal of scale precursor ions by lime-soda ash softening • Enhanced water recovery from 54% to 86% by mitigation of FO membrane scaling • High-purity CaCO3 was recovered from the softening sludge • Membrane cleaning efficiency of 88.5% was obtained by EDTA for softened ROC Reverse osmosis (RO) is frequently used for water reclamation from treated wastewater or desalination plants. The RO concentrate (ROC) produced from the coal chemical industry (CCI) generally contains refractory organic pollutants and extremely high-concentration inorganic salts with a dissolved solids content of more than 20 g/L contributed by inorganic ions, such as Na+, Ca2+, Mg2+, Cl−, and SO42−. To address this issue, in this study, we focused on coupling forward osmosis (FO) with chemical softening (FO-CS) for the volume minimization of CCI ROC and the recovery of valuable resources in the form of CaCO3. In the case of the real raw CCI ROC, softening treatment by lime-soda ash was shown to effectively remove Ca2+/Ba2+ (>98.5%) and Mg2+/Sr2+/Si (>80%), as well as significantly mitigate membrane scaling during FO. The softened ROC and raw ROC corresponded to a maximum water recovery of 86% and 54%, respectively. During cyclic FO tests (4 × 10 h), a 27% decline in the water flux was observed for raw ROC, whereas only 4% was observed for softened ROC. The cleaning efficiency using EDTA was also found to be considerably higher for softened ROC (88.5%) than that for raw ROC (49.0%). In addition, CaCO3 (92.2% purity) was recovered from the softening sludge with an average yield of 5.6 kg/m3 treated ROC. This study provides a proof-of-concept demonstration of the FO-CS coupling process for ROC volume minimization and valuable resources recovery, which makes the treatment of CCI ROC more efficient and more economical.

关键词: Coal chemical industry     Forward osmosis     Chemical softening     Reverse osmosis concentrate    

<strong>Sugarcane bagasse amendment improves the quality of green waste vermicompost and the growth ofstrong><strong>Eisenia fetidastrong>

Linlin Cai, Xiangyang Sun, Dan Hao, Suyan Li, Xiaoqiang Gong, Hao Ding, Kefei Yu

《环境科学与工程前沿(英文)》 2020年 第14卷 第4期 doi: 10.1007/s11783-020-1240-2

摘要: •Earthworms were able to convert green waste into more plant-available nutrients. •The part of heavy metals content increased in the compost added by earthworm. •The addition of SCB to GW did enhance earthworm biomass and humic acid content. •The resulting vermicomposts were characterized by neutral pH and lower EC value. Vermicomposting is a feasible method for disposing of lignocellulosic waste while generating a useful product. The current study assessed the potential of vermicomposting green waste mixed with sugarcane bagasse in proportions of 25%, 50%, and 75% (v:v, based on dry weight). The suitability was evaluated based on the agrochemical properties, earthworm biomass, and phytotoxicity. The final vermicomposts exhibited near-neutral pH values (7.1–7.6), and lower EC values (0.43–0.72 mS/cm) and C:N ratios (14.1–19.9).The content of available nutrients and CEC for all the vermicomposts exceeded those of the control compost (without earthworms). For vermicomposts, the average values of NO3–-N, AP, AK, and CEC were 53, 517, 1362 mg/kg, and 158 cmol/kg, respectively. The total contents of heavy metals increased in all vermicompost treatments compared to control composts with the following average final percentages: Zn (2.0%), Cr (15.5%), Pb (23.4%), and Cu (44.3%), but these amounts were safe for application in agroforestry. The addition of sugarcane bagasse to green waste significantly increased the content of total humic substance, humic acid and urease activity, acid and alkaline phosphatase activity, and Eiseniafetida reproduction. The addition of 25% sugarcane bagasse to green waste decreased the toxicity to germinating seeds. These results revealed that vermicomposting is a feasible way to degrade green waste into a value-added chemical product.

关键词: Green waste     Earthworms     Sugarcane bagasse     Vermicomposting     Nutrient recovery    

标题 作者 时间 类型 操作

汶川巨震的预测和思考

耿庆国

期刊论文

Features of seismic hazard in large dam projects and strong motion monitoring of large dams

Martin WIELAND,

期刊论文

Seismic design of high-rise towers for cable-stayed bridges under strong earthquakes

Yan XU, Shide HU

期刊论文

应坚持地震是可以预测预报的科学信念——记汶川三次强余震的成功预测

汪成民

期刊论文

强震成功预报的曙光

李玶,杨美娥

期刊论文

青藏北块M≥7强震有序网络结构与汶川8级大震预测回顾

门可佩

期刊论文

<strong>FESEstrong><strong>’s Best Papers of 2017strong>

期刊论文

<strong>Photosynthesis and related metabolic mechanism of promoted rice (strong><strong>Oryza sativastrong><strong> L.) growth by TiOstrong><strong>2strong><strong> nanoparticlesstrong>

Yingdan Zhang, Na Liu, Wei Wang, Jianteng Sun, Lizhong Zhu

期刊论文

大尺度地层内的分层运动

许绍燮

期刊论文

<strong>Adsorption characteristics of ciprofloxacin onto g-MoSstrong><strong>2strong><strong> coated biochar nanocompositesstrong>

Zhenyu Yang, Rong Xing, Wenjun Zhou, Lizhong Zhu

期刊论文

<strong>A newly defined dioxygenase system from strong><strong>Mycobacterium vanbaaleniistrong><strong> PYR-1 endowed with an enhanced activity of dihydroxylation of high-molecular-weight polyaromatichydrocarbonsstrong>

Yiquan Wu, Ying Xu, Ningyi Zhou

期刊论文

<strong>Fabrication and photocatalytic ability of an Au/TiOstrong><strong>2strong><strong>/reduced graphene oxide nanocompositestrong>

Fenghe Lv, Hua Wang, Zhangliang Li, Qi Zhang, Xuan Liu, Yan Su

期刊论文

<strong>Effects of cultivation strategies on the cultivation of strong><strong>Chlorellastrong><strong> sp.HQ in photoreactorsstrong>

Xiaoya Liu, Yu Hong, Peirui Liu, Jingjing Zhan, Ran Yan

期刊论文

<strong>Forward osmosis coupled with lime-soda ash softening for volume minimization of reverse osmosisconcentrate and CaCOstrong><strong>3strong><strong> recovery: A case study on the coalchemical industrystrong>

Jiandong Lu, Shijie You, Xiuheng Wang

期刊论文

<strong>Sugarcane bagasse amendment improves the quality of green waste vermicompost and the growth ofstrong><strong>Eisenia fetidastrong>

Linlin Cai, Xiangyang Sun, Dan Hao, Suyan Li, Xiaoqiang Gong, Hao Ding, Kefei Yu

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