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Phenolic compounds removal by wet air oxidation based processes

Linbi Zhou, Hongbin Cao, Claude Descorme, Yongbing Xie

《环境科学与工程前沿(英文)》 2018年 第12卷 第1期 doi: 10.1007/s11783-017-0970-2

摘要: Wet air oxidation (WAO) and catalytic wet air oxidation (CWAO) are efficient processes to degrade organic pollutants in water. In this paper, we especially reviewed the WAO and CWAO processes for phenolic compounds degradation. It provides a comprehensive introduction to the CWAO processes that could be beneficial to the scientists entering this field of research. The influence of different reaction parameters, such as temperature, oxygen pressure, pH, stirring speed are analyzed in detail; Homogenous catalysts and heterogeneous catalysts including carbon materials, transitional metal oxides and noble metals are extensively discussed, among which Cu based catalysts and Ru catalysts were shown to be the most active. Three different kinds of the reactor implemented for the CWAO (autoclave, packed bed and membrane reactors) are illustrated and compared. To enhance the degradation efficiency and reduce the cost of the CWAO process, biological degradation can be combined to develop an integrated technology.

关键词: Wet air oxidation     Catalytic wet air oxidation     Phenolic compounds     Heterogeneous catalysts     Mechanism    

Characterization of value-added chemicals derived from the thermal hydrolysis and wet oxidation of sewage

Milan Malhotra, Anurag Garg

《环境科学与工程前沿(英文)》 2021年 第15卷 第1期 doi: 10.1007/s11783-020-1305-2

摘要: Abstract • Hydrothermal treatment can greatly improve resource recovery from sewage sludge. • tCOD removal during WO was ~55% compared with ~23% after TH. • TOC solubilization during hydrothermal treatment followed first-order kinetics. • Solids and carbon balance confirmed loss of organics during thermal hydrolysis. • Reaction pathways for thermal hydrolysis and wet oxidation are proposed. We evaluated the effect of hydrothermal pretreatments, i.e., thermal hydrolysis (TH) and wet oxidation (WO) on sewage sludge to promote resource recovery. The hydrothermal processes were performed under mild temperature conditions (140°C–180°C) in a high pressure reactor. The reaction in acidic environment (pH= 3.3) suppressed the formation of the color imparting undesirable Maillard’s compounds. The oxidative conditions resulted in higher volatile suspended solids (VSS) reduction (~90%) and chemical oxygen demand (COD) removal (~55%) whereas TH caused VSS and COD removals of ~65% and ~27%, respectively at a temperature of 180°C. During TH, the concentrations of carbohydrates and proteins in treated sludge were 400–1000 mg/L and 1500–2500 mg/L, respectively. Whereas, WO resulted in solids solubilization followed by oxidative degradation of organics into smaller molecular weight carboxylic acids such as acetic acid (~400–500 mg/L). Based on sludge transformation products generated during the hydrothermal pretreatments, simplified reaction pathways are predicted. Finally, the application of macromolecules (such as proteins), VFAs and nutrients present in the treated sludge are also discussed. The future study should focus on the development of economic recovery methods for various value-added compounds.

关键词: Hydrothermal pretreatment     Reaction kinetics     Reaction pathway     Sewage sludge     Thermal hydrolysis     Wet oxidation    

Catalytic wet air oxidation of phenol, nitrobenzene and aniline over the multi-walled carbon nanotubes

Shaoxia YANG,Yu SUN,Hongwei YANG,Jiafeng WAN

《环境科学与工程前沿(英文)》 2015年 第9卷 第3期   页码 436-443 doi: 10.1007/s11783-014-0681-x

摘要: Wet air oxidation (WAO) is one of effective technologies to eliminate hazardous, toxic and highly concentrated organic compounds in the wastewater. In the paper, multi-walled carbon nanotubes (MWCNTs), functionalized by O , were used as catalysts in the absence of any metals to investigate the catalytic activity in the catalytic wet air oxidation (CWAO) of phenol, nitrobenzene (NB) and aniline at the mild operating conditions (reaction temperature of 155°C and total pressure of 2.5 MPa) in a batch reactor. The MWCNTs were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), gas adsorption measurements (BET), fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The functionalized MWCNTs showed good catalytic performance. In the CWAO of phenol over the functionalized MWCNTs, total phenol removal was obtained after 90 min run, and the reaction apparent activation energy was ca. 40 kJ·mol . The NB was not removed in the CWAO of single NB, while ca. 97% NB removal was obtained and 40% NB removal was attributed to the catalytic activity after 180 min run in the presence of phenol. Ca. 49% aniline conversion was achieved after 120 min run in the CWAO of aniline.

关键词: catalytic wet air oxidation (CWAO)     carbon nanotubes (CNTs)     phenol     nitrobenzene     aniline    

Wastewater treatment by catalytic wet air oxidation process over Al-Fe pillared clays synthesized using

Halima Sassi, Gwendoline Lafaye, Hédi Ben Amor, Abdelaziz Gannouni, Mohamed Razak Jeday, Jacques Barbier-Jr

《环境科学与工程前沿(英文)》 2018年 第12卷 第1期 doi: 10.1007/s11783-017-0971-1

摘要: Microwave irradiation has been used to prepare Al, Fe-pillared clays from a natural Tunisian smectite from the El Hicha deposit (province of Gabes). Chemical analysis, XRD spectra and surface properties evidenced the success of pillaring process. The obtained solids present higher surface area and pore volume than conventionally prepared Al-Fe pillared clays. The main advantages of the microwave methodology are the considerable reduction of the synthesis time and the consumption of water. The microwave-derived Al-Fe pillared clays have been tested for catalytic wet air oxidation (CWAO) of phenol in a stirred tank at 160°C and 20 bar of pure oxygen pressure. These materials are efficient for CWAO of phenol and are highly stable despite the severe operating conditions (acidic media, high pressure, high temperature). The catalyst deactivation was also significantly hindered when compared to conventionally prepared clays. Al-Fe pillared clays prepared by microwave methodology are promising as catalysts for CWAO industrial water treatment.

关键词: Water     Catalytic wet air oxidation     Pillared clays     Microwave     Phenol    

Survey of thermal comfort in residential buildings under natural conditions in hot humid and cold wet

Changhai PENG

《结构与土木工程前沿(英文)》 2010年 第4卷 第4期   页码 503-511 doi: 10.1007/s11709-010-0095-1

摘要: Comfort standards (ISO 7730, ASHRAE 55) specify the exact physical criteria for producing acceptable thermal environments, such as temperature, air movement, and humidity limits. These, however, are often difficult to comply with, particularly in hot humid and cold wet seasons in Nanjing, China. Changing expectations of comfort is important in evaluating comfort, since naturally conditioned buildings in Nanjing are not typically air-conditioned. For this objective, a field study was conducted during the summer of 2000 and the winter of 2001. A total of 600 participants each answered a subjective questionnaire. Analyzing these field data shows that in natural conditions, the influence of gender and age on people’s thermal sensations is insignificant compared with six main variables. In addition, people’s thermal discomfort rapidly increases along with growth in relative humidity. Further, the variation of people’s hot or cold sensations is in proportion to that of air movement, and the effect in winter is greater than that in summer. The range of acceptable temperatures in hot humid and cold wet Nanjing is between 14.14°C and 29.42°C.

关键词: thermal comfort     naturally conditioned     hot humid     cold wet     Nanjing    

of carboxymethyl cellulose on morphology of hydroxyapatite nanoparticles as prepared with one-step wet

Ruiqiang LIU,Rattan LAL

《环境科学与工程前沿(英文)》 2015年 第9卷 第5期   页码 804-812 doi: 10.1007/s11783-015-0785-y

摘要: Nano-sized apatite particles (nAP) synthesized with carboxymethyl cellulose (CMC) have shown great application potentials in in situ heavy metal remediation. However, differences in CMC’s properties effects on the size of nAP produced are not well understood. In this paper, two types of CMC, with respective molecular weights (MW) of ~120000 and ~240000 Dalton or respective polymerization degrees of 500 (CMC-500) and 1050 (CMC-1050), were studied in a concentration range of 0.05%–0.5% (w/w) for nAP synthesis. Morphology of the particles was characterized with transmission electron microscopy (TEM). Results showed that 0.05% CMC-500 solution gave an average particle size of 148.7±134.9 nm, 0.25% CMC-500 solution produced particles of 21.8±20.4 nm, and, 0.5% CMC-500 solution contained particles of 15.8±7.7 nm. In comparison, 0.05% CMC-1050 solution produced nanoparticles of 6.8±3.2 nm, 0.25% CMC-1050 produced smaller nAP of 4.3±3.2 nm, and 0.5% CMC-1050 synthesized the smallest nanoparticles in this study, with an average diameter of 3.0±2.1 nm. Chemical composition of the products was identified with X-ray diffraction (XRD) as pure hydroxyapatite. Interactions between nAP and CMC were discussed with help of attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopic data. This study showed that CMC at higher concentration as well as higher MW facilitated to produce finer nanoparticles, showing that nAP size could be manipulated by selecting appropriate CMC MW and/or applying appropriate CMC concentration.

关键词: nanotechnology     nanoparticles     apatite     carboxymethyl cellulose (CMC)     particle size    

Performance evaluation on the pollution control against wet weather overflow based on on-site coagulation

Zongqun Chen, Wei Jin, Hailong Yin, Mengqi Han, Zuxin Xu

《环境科学与工程前沿(英文)》 2021年 第15卷 第6期 doi: 10.1007/s11783-021-1400-z

摘要: Abstract • A way for overflow control based on on-site coagulation/flocculation was proposed. • Coagulant and flocculant dose were optimized based on pollutant removal performance. • Settling time of 5 min is enough in a proper transmission distance. • Fast removal of particulate pollutants could be achieved under varied flow. The pollution caused by wet weather overflow in urban drainage systems is a main factor causing blackening an odorization of urban rivers. The conventional overflow treatment based on coagulation/flocculation in terminal drainage systems requires relatively large space and long retention time demand that makes it not applicable in crowded urban drainage systems or under heavy rains. On-site coagulation/flocculation in terminal drainage pipes was proposed in this study which was aimed to transfer the coagulation/flocculation process to the inside of pipes at the terminal drainage system to save space and reduce the retention time of the coagulation/flocculation process. The optimized dose of chemicals was studied first which was 80 mg/L of coagulant and 0.8 mg/L of flocculant. Settling for only 5 min can remove most of the pollutants at 406.5 m of transmission distance. In addition, the relation of wet weather overflow rate and concentration of pollution load on the on-site coagulation/flocculation process was investigated, which indicated that high removal of pollutant was gained at a large range of flow velocity and pollutant concentration. Finally, the study confirmed electric neutralization, bridging, and net capture as the major mechanisms in this process, and further optimization was proposed. The proposed process can reduce much turbidity, chemical oxygen demand, and total phosphorous, but hardly remove soluble ammonia and organics. This work provides scientific guidance to address wet weather overflow in terminal drainage pipes.

关键词: Wet weather overflow     On-site coagulation/flocculation     Fast removal of particulate pollutants    

Removing ammonia from air with a constant pH, slightly acidic water spray wet scrubber using recycled

Ahmad Kalbasi Ashtari, Amir M. Samani Majd, Gerald L. Riskowski, Saqib Mukhtar, Lingying Zhao

《环境科学与工程前沿(英文)》 2016年 第10卷 第6期 doi: 10.1007/s11783-016-0869-3

摘要: Slightly acidic solutions are a practical means of removing ammonia from air Scrubbed NH accumulates in solution as NH and should be an excellent fertilizer Increased air velocity decreased NH removal and increased NH collection Previous research on wet scrubbers has only studied highly acidic scrubbing solutions because of their high ammonia capture efficiencies; however, the high acidity created practical problems. Lower acidity solutions would reduce corrosion, maintenance, and cost; however, designers may need to use strategies for increasing scrubber effectiveness, such as using lower air velocities. The objective of this study was to determine if a spray scrubber with slightly acidic and higher pH scrubbing solution (pH from 2 to 8) could effectively remove NH from NH laden air (such as animal building exhaust air), and also collect this valuable resource for later use as a fertilizer. A bench-scale spray wet scrubber treated 20 ppmv NH /air mixture in a countercurrent contact chamber. First, the solution pH was varied from 2 to 8 while maintaining constant air velocity at 1.3 m·s . Next, air velocity was increased (2 and 3 m·s ) while solution pH remained constant at pH6. At 1.3 m·s , NH removal efficiencies ranged between 49.0% (pH8) and 84.3% (pH2). This study has shown that slightly acidic scrubbing solutions are a practical means of removing ammonia from air especially if the scrubber is designed to increase collisions between solution droplets and NH molecules. The NH removed from the air was held in solution as NH and accumulates over time so the solution should be an excellent fertilizer.

关键词: Ammonia     Spray wet scrubber     Slightly acidic scrubbing solution     Controlled pH     Removal efficiency    

Preparation of rare-earth metal complex oxide catalysts for catalytic wet air oxidation

LI Ning, LI Guangming, YAO Zhenya, ZHAO Jianfu

《环境科学与工程前沿(英文)》 2007年 第1卷 第2期   页码 190-195 doi: 10.1007/s11783-007-0033-1

摘要: Catalytic wet air oxidation (CWAO) is one of the most promising technologies for pollution abatement. Developing catalysts with high activity and stability is crucial for the application of the CWAO process. The Mn/Ce complex oxide catalysts for CWAO of high concentration phenolcontaining wastewater were prepared by coprecipitation. The catalyst preparation conditions were optimized by using an orthogonal layout method and single-factor experimental analysis. The Mn/Ce serial catalysts were characterized by Brunauer Emmett Teller (BET) analysis and the metal cation leaching was measured by inductively coupled plasma torch-atomic emission spectrometry (ICP-AES). The results show that the catalysts have high catalytic activities even at a low temperature (80?C) and low oxygen partial pressure (0.5 MPa) in a batch reactor. The metallic ion leaching is comparatively low (Mn<6.577 mg/L and Ce<0.6910 mg/L, respectively) in the CWAO process. The phenol, COD, and TOC removal efficiencies in the solution exceed 98.5% using the optimal catalyst (named CSP). The new catalyst would have a promising application in CWAO treatment of high concentration organic wastewater.

关键词: torch-atomic emission     Brunauer     Catalytic     process     stability    

Air-side heat transfer and friction characteristics of biofouled evaporator under wet conditions

Hui PU, Guoliang DING, Xiaokui MA, Haitao HU, Yifeng GAO,

《能源前沿(英文)》 2010年 第4卷 第3期   页码 306-312 doi: 10.1007/s11708-009-0067-0

摘要: The effects of biofouling on air-side heat transfer and friction characteristics under wet conditions of three biofouled finned tube heat exchangers and one clean finned tube heat exchanger were investigated experimentally. Experimental results indicate that the biofouled fin efficiency of the evaporator decreases by 15.5% compared with the clean evaporator under the condition of the biofouled area ratio of 60% at the inlet air velocity of 2.0m/s; The ranges of friction fouling factor and heat transfer fouling factor are 19.8%―43.1% and ―15.6%―13.1%, respectively; a small quantity of biofouled particles can enhance heat transfer at low Reynolds number, and the enhancement effect decreases with the increase of Reynolds number.

关键词: finned tube     evaporator     fouling     heat transfer     friction    

结合选择性和数字湿法腐蚀的InAlAs/InGaAs InP基HEMTs两步栅槽腐蚀工艺 Article

Ying-hui ZHONG, Shu-xiang SUN, Wen-bin WONG, Hai-li WANG, Xiao-ming LIU, Zhi-yong DUAN, Peng DING, Zhi JIN

《信息与电子工程前沿(英文)》 2017年 第18卷 第8期   页码 1180-1185 doi: 10.1631/FITEE.1601121

摘要: 本文针对InAlAs/InGaAs InP基高电子迁移率晶体管(HEMTs)提出了一种结合高选择性湿法腐蚀和非选择性数字湿法腐蚀的两步栅槽腐蚀工艺。通过采用丁二酸和双氧水(H2O2)混合溶液,InGaAs与InAlAs材料的腐蚀选择比可以超过100。该选择性湿法腐蚀工艺在InAlAs/InGaAs InP基HEMTs栅槽工艺中得到了很好的验证,栅槽腐蚀会自动终止在InAlAs势垒层。本文通过分离氧化/去氧化过程开发了非选择性数字湿法腐蚀工艺,每个周期能除去1.2 nm InAlAs材料。最终,两步栅槽腐蚀工艺被成功用于器件制备中,数字湿法腐蚀重复两个周期去掉约3 nm InAlAs势垒层材料。通过该方法制备的InP基HEMTs器件比只依靠选择性湿法腐蚀栅槽工艺制备出的器件具有更短的栅沟间距,表现出更好的有效跨导和射频特性。

关键词: 高电子迁移率晶体管(High electron mobility transistors     HEMTs);栅槽;数字湿法腐蚀;选择性湿法腐蚀    

处理我国高浓度工业废水的工艺技术研究

孙珮石,钱彪,洪品杰,原田吉明,杨英,郝玉昆

《中国工程科学》 2003年 第5卷 第6期   页码 68-73

摘要:

利用引进的CWO处理技术及其200 L/d小型工业试验装置,对我国焦化、造纸、生物制药等十多种行业的高浓度工业有机废水进行处理试验研究,结果表明CWO技术及装置对处理我国高浓度工业有机废水具有良好的适用性。在昆明自主设计、制造、集成建设和运行了一套20 m3/d工业应用装置,完成了对该技术的国产化研究与示范工程。该工业化应用装置对造纸黑液、焦化废水等两种高浓度生化难降解工业有机废水具有良好的净化处理性能,废水中的CODCr,NH3-N等的去除率均达99%以上,可以使废水经处理后连续稳定地达标排放,并具有较好的经济性。

关键词: 湿式催化氧化技术(CWO)     高浓度工业废水     工艺流程    

Pore-scale simulation of water/oil displacement in a water-wet channel

Jin Zhao, Guice Yao, Dongsheng Wen

《化学科学与工程前沿(英文)》 2019年 第13卷 第4期   页码 803-814 doi: 10.1007/s11705-019-1835-y

摘要: Water/oil flow characteristics in a water-wet capillary were simulated at the pore scale to increase our understanding on immiscible flow and enhanced oil recovery. Volume of fluid method was used to capture the interface between oil and water and a pore-throat connecting structure was established to investigate the effects of viscosity, interfacial tension (IFT) and capillary number ( ). The results show that during a water displacement process, an initial continuous oil phase can be snapped off in the water-wet pore due to the capillary effect. By altering the viscosity of the displacing fluid and the IFT between the wetting and non-wetting phases, the snapped-off phenomenon can be eliminated or reduced during the displacement. A stable displacement can be obtained under high number conditions. Different displacement effects can be obtained at the same number due to its significant influence on the flow state, i.e., snapped-off flow, transient flow and stable flow, and ultralow IFT alone would not ensure a very high recovery rate due to the fingering flow occurrence. A flow chart relating flow states and the corresponding oil recovery factor is established.

关键词: VOF     pore scale     immiscible displacement     EOR     snap-off     Ca    

液体调速离合器中摩擦副热效应分析

洪跃,刘谨,王云根

《中国工程科学》 2003年 第5卷 第9期   页码 55-60

摘要:

液体粘性调速离合器是利用多个摩擦圆盘间的油膜剪切力来传递动力,并通过改变油膜厚度实行无级调速。由于近来工程中广泛采用聚α-稀烃型、聚酯型等合成油作润滑剂,液体粘性调速离合器在调速范围内,其摩擦副往往工作在流体润滑、混合润滑、边界润滑直到直接接触的工况。基于这些特点,笔者采用了幂律型非牛顿流体模型、Patir-Cheng的平均流量模型、GT两粗糙平面接触模型、计入油膜的惯性影响、平均能量方程、热传导方程,建立了热效应研究模型,推导了相应的计算方程式,并在流体润滑、流体混合润滑状态下,进行了数值计算与分析。

关键词: 液体调速离合器     热分析     雷诺方程     非牛顿流体     表面粗糙度    

The development of roadside green swales in the Chinese Sponge City Program: Challenges and opportunities

《工程管理前沿(英文)》   页码 566-581 doi: 10.1007/s42524-023-0267-z

摘要: Roadside green swales have emerged as popular stormwater management infrastructure in urban areas, serving to mitigate stormwater pollution and reduce urban surface water discharge. However, there is a limited understanding of the various types, structures, and functions of swales, as well as the potential challenges they may face in the future. In recent years, China has witnessed a surge in the adoption of roadside green swales, especially as part of the prestigious Sponge City Program (SCP). These green swales play a crucial role in controlling stormwater pollution and conserving urban water resources by effectively removing runoff pollutants, including suspended solids, nitrogen, and phosphorus. This review critically examines recent research findings, identifies key knowledge gaps, and presents future recommendations for designing green swales for effective stormwater management, with a particular emphasis on ongoing major Chinese infrastructure projects. Despite the growing global interest in bioswales and their significance in urban development, China’s current classification of such features lacks a clear definition or specific consideration of bioswales. Furthermore, policymakers have often underestimated the adverse environmental effects of road networks, as reflected in existing laws and planning documents. This review argues that the construction and maintenance of roadside green swales should be primarily based on three critical factors: Well-thought-out road planning, suitable construction conditions, and sustainable long-term funding. The integration of quantitative environmental standards into road planning is essential to effectively address the challenge of pollution from rainfall runoff. To combat pollution associated with roads, a comprehensive assessment of potential pollution loadings should be carried out, guiding the appropriate design and construction of green swales, with a particular focus on addressing the phenomenon of first flush. One of the major challenges faced in sustaining funds for ongoing maintenance after swale construction. To address this issue, the implementation of a green finance platform is proposed. Such a platform would help ensure the availability of funds for continuous maintenance, thus maximizing the long-term effectiveness of green swales in stormwater management. Ultimately, the findings of this review aim to assist municipal governments in enhancing and implementing future urban road designs and SCP developments, incorporating effective green swale strategies.

关键词: grass swale     infiltration swale     bioswale     wet swale     sponge city    

标题 作者 时间 类型 操作

Phenolic compounds removal by wet air oxidation based processes

Linbi Zhou, Hongbin Cao, Claude Descorme, Yongbing Xie

期刊论文

Characterization of value-added chemicals derived from the thermal hydrolysis and wet oxidation of sewage

Milan Malhotra, Anurag Garg

期刊论文

Catalytic wet air oxidation of phenol, nitrobenzene and aniline over the multi-walled carbon nanotubes

Shaoxia YANG,Yu SUN,Hongwei YANG,Jiafeng WAN

期刊论文

Wastewater treatment by catalytic wet air oxidation process over Al-Fe pillared clays synthesized using

Halima Sassi, Gwendoline Lafaye, Hédi Ben Amor, Abdelaziz Gannouni, Mohamed Razak Jeday, Jacques Barbier-Jr

期刊论文

Survey of thermal comfort in residential buildings under natural conditions in hot humid and cold wet

Changhai PENG

期刊论文

of carboxymethyl cellulose on morphology of hydroxyapatite nanoparticles as prepared with one-step wet

Ruiqiang LIU,Rattan LAL

期刊论文

Performance evaluation on the pollution control against wet weather overflow based on on-site coagulation

Zongqun Chen, Wei Jin, Hailong Yin, Mengqi Han, Zuxin Xu

期刊论文

Removing ammonia from air with a constant pH, slightly acidic water spray wet scrubber using recycled

Ahmad Kalbasi Ashtari, Amir M. Samani Majd, Gerald L. Riskowski, Saqib Mukhtar, Lingying Zhao

期刊论文

Preparation of rare-earth metal complex oxide catalysts for catalytic wet air oxidation

LI Ning, LI Guangming, YAO Zhenya, ZHAO Jianfu

期刊论文

Air-side heat transfer and friction characteristics of biofouled evaporator under wet conditions

Hui PU, Guoliang DING, Xiaokui MA, Haitao HU, Yifeng GAO,

期刊论文

结合选择性和数字湿法腐蚀的InAlAs/InGaAs InP基HEMTs两步栅槽腐蚀工艺

Ying-hui ZHONG, Shu-xiang SUN, Wen-bin WONG, Hai-li WANG, Xiao-ming LIU, Zhi-yong DUAN, Peng DING, Zhi JIN

期刊论文

处理我国高浓度工业废水的工艺技术研究

孙珮石,钱彪,洪品杰,原田吉明,杨英,郝玉昆

期刊论文

Pore-scale simulation of water/oil displacement in a water-wet channel

Jin Zhao, Guice Yao, Dongsheng Wen

期刊论文

液体调速离合器中摩擦副热效应分析

洪跃,刘谨,王云根

期刊论文

The development of roadside green swales in the Chinese Sponge City Program: Challenges and opportunities

期刊论文