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中深层地埋管地源热泵复合热源系统优化研究

制冷与空调 2024年第8期24卷 82-88页

作者：董世豪王皓于岳龙李炳学 Risto Kosonen 倪龙哈尔滨工业大学建筑与设计学院寒地城乡人居环境科学与技术工业和信息化部重点实验室华晨宝马汽车有限公司阿尔托大学

为提升中深层地埋管地源热泵系统经济性,以沈阳某工厂改造项目为例,以“地源热泵+电锅炉”的复合热源系统为对象,建立复合式中深层地埋管地源热泵系统的多维评价算法,耦合地埋管、关键设备和负荷特性,分析设计参数对能耗、减碳量和净现... 详细信息

为提升中深层地埋管地源热泵系统经济性,以沈阳某工厂改造项目为例,以“地源热泵+电锅炉”的复合热源系统为对象,建立复合式中深层地埋管地源热泵系统的多维评价算法,耦合地埋管、关键设备和负荷特性,分析设计参数对能耗、减碳量和净现值等指标的影响。结果表明:碳排放随电力碳排放因子下降而逐年降低;热泵负荷占比越大,减排潜力越大;当热泵负荷配比为0.62,钻孔深度为2900 m时,相对净现值达到最大值(44.6×10^(6)元),相对原系统节省4976.4吨标准煤。

关键词：地源热泵套管式换热器经济性优化

Complexation of sym-bis(benzimidazole)-2,2'-ethylene salts with cucurbit[6]uril derivatives:A potential axle molecule for pseudorotaxanes

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Chinese Chemical Letters 2013年第5期24卷 362-366页

作者： Jun-Ming Yi Xin-long ni Xin Xiao Li-Bing Lu Sai-Feng Xue Qian-Jiang Zhu Zhu Tao Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province Guizhou University

Sym-bis（benzimidazole）-2,2＇-ethylene cations act as a new axle template for threading cucurbit[6]uril derivatives on,forming[2]pseudorotaxane and[3]*** new complexes have been studied using 1 H NMR,UV-vis absorption spectroscopy and X-ray *** in the 1 H NMR spectra indicate that the two types of pseudorotaxane can be formed by varying the host concentration. UV-vis absorption titration experiments at different pH values demonstrate that interesting pK_a shifts of the bis-benzimidazole derivatives can be induced by the host-guest *** associated constants were calculated to be 2.81×10^4 L/mol and 9.06×10^6 L/mol for the[2]pseudorotaxanes and ｜3]pseudorotaxanes,***,X-ray diffraction studies of the solid state structures provide unequivocal proof of the host concentration dependent pseudorotaxane,which is strongly in line with the evidences in solution.

关键词： Cucurnituril derivatives Bis(benzimidazole) derivatives Pseudorotaxane Crystal structure

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同井回灌地下水源热泵地下水渗流理论研究

太阳能学报 2006年第12期27卷 1219-1224页

作者：倪龙马最良哈尔滨工业大学热泵空调技术研究所哈尔滨150090

建立了单一介质承压含水层中定流量同井回灌地下水源热泵抽水和回灌引发的地下水渗流数学模型;利用叠加原理推导了同井回灌地下水源热泵地下水渗流的理论解。通过分析理论解,从中得出稳态降深方程、稳态渗流速度方程、准稳态时间方程和... 详细信息

建立了单一介质承压含水层中定流量同井回灌地下水源热泵抽水和回灌引发的地下水渗流数学模型;利用叠加原理推导了同井回灌地下水源热泵地下水渗流的理论解。通过分析理论解,从中得出稳态降深方程、稳态渗流速度方程、准稳态时间方程和理想井间距方程。定流量同井回灌地下水源热泵引发的地下水渗流能在很短的时间内达到稳态,并且理想井间距仅是含水层厚度和渗透系数比的函数。对于完整型的观测井不论位置如何,其平均降深均为0。

关键词：地下水源热泵同井回灌渗流模型降深

用分数阶微分实现时频重叠多模式兰姆波的模式分离

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声学学报 2020年第2期45卷 205-214页

作者：陈晓倪龙南京信息工程大学电子与信息工程学院南京210044 南京信息工程大学大气环境与装备技术协同创新中心南京210044

为了分离时频重叠多模式超声兰姆波,提出了一种用分数阶微分理论实现多模式兰姆波模式分离的方法。以时频重叠的S1和A1模式混合信号为例,用赛利斯分布作为幅值谱的模型,首先对信号做频散补偿,由补偿后信号幅值谱分数阶微分推导了幅值谱... 详细信息

为了分离时频重叠多模式超声兰姆波,提出了一种用分数阶微分理论实现多模式兰姆波模式分离的方法。以时频重叠的S1和A1模式混合信号为例,用赛利斯分布作为幅值谱的模型,首先对信号做频散补偿,由补偿后信号幅值谱分数阶微分推导了幅值谱特征参数的计算式并根据信号模型重建幅值谱,然后结合兰姆波的频散特性推导出对应的相位谱,并通过幅值谱和相位谱重构各模式的信号,实现模式分离。对1 mm钢板中仿真时频重叠的S1和A1模式信号分离结果显示分离出信号的幅值和带宽相对误差小于6%,中心频率相对误差小于0.25%。实验结果也证实了方法的可行性。因此当混合信号幅值谱不完全交叠时,本方法可以实现多模式兰姆波信号的分离,有助于多模式兰姆波频散信号的分析和识别。

关键词：分数阶微分特征参数频散特性兰姆波模式分离时频重叠幅值谱混合信号相位谱频散补偿

long-lived lunar volcanism sustained by precession-driven core-mantle friction

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National Science Review 2024年第2期11卷 114-123页

作者： Shuoran Yu Xiao Xiao Shengxia Gong nicola Tosi Jun Huang Doris Breuer long Xiao Dongdong ni State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology Planetary Science Institute State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences CAS Key Laboratory of Planetary Sciences Shanghai Astronomical Observatory Institute of Planetary Research German Aerospace Centre(DLR)

Core-mantle friction induced by the precession of the Moon's spin axis is a strong heat source in the deep lunar mantle during the early phase of a satellite's evolution, but its influence on the long-term thermal evolution still remains poorly explored. Using a one-dimensional thermal evolution model, we show that core-mantle friction can sustain global-scale partial melting in the upper lunar mantle until ～3.1 Ga, thus accounting for the intense volcanic activity on the Moon before ～3.0 Ga. Besides, core-mantle friction tends to suppress the secular cooling of the lunar core and is unlikely to be an energy source for the long-lived lunar core dynamo. Our model also favours the transition of the Cassini state before the end of the lunar magma ocean phase(～4.2 Ga), which implies a decreasing lunar obliquity over time after the solidification of the lunar magma ocean. Such a trend of lunar obliquity evolution may allow volcanically released water to be buried in the lunar regolith of the polar regions. As a consequence, local water ice could be more abundant than previously thought when considering only its accumulation caused by solar wind and comet spreading.

关键词： Moon precession orbit volcanism

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含水层参数对同井回灌地下水源热泵的影响

天津大学学报 2006年第2期39卷 229-234页

作者：倪龙马最良哈尔滨工业大学市政环境工程学院哈尔滨150090

模拟分析了含水层厚度、渗透系数比和不同含水层对同井回灌地下水源热泵地下水渗流和换热的影响．对于合理的水井设计,含水层厚度增大可以减小抽水、回灌压力,显著地提高抽水平均温度．抽、回水口的平均降深与渗透系数比的对数基本成线... 详细信息

模拟分析了含水层厚度、渗透系数比和不同含水层对同井回灌地下水源热泵地下水渗流和换热的影响．对于合理的水井设计,含水层厚度增大可以减小抽水、回灌压力,显著地提高抽水平均温度．抽、回水口的平均降深与渗透系数比的对数基本成线性关系．从热贯通的角度来说,渗透系数比是同井回灌地下水源热泵系统工程成败的关键．过小的渗透系数比显著加快系统的热贯通．渗透系数大小是抽水和回灌难易程度的决定因素．对于渗透性能不好的含水层,更应该关注抽水和回灌不能对含水层渗透系数产生影响．

关键词：含水层同井回灌地下水源热泵渗透系数

Hoffa's fracture in a five-year-old child diagnosed and treated with the assistance of arthroscopy:A case report

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World Journal of Clinical Cases 2022年第36期10卷 13458-13466页

作者： Zhi-Hao Chen Hai-Fan Wang Hao-Yu Wang Fei Li Xue-Feng Bai Jian-long ni Zhi-Bin Shi The First Department of Orthopaedics The Second Affiliated Hospital of Xi’an Jiaotong UniversityXi’an Jiaotong UniversityXi'an 710004Shaanxi ProvinceChina Department of Orthopaedics Xi’an Daxing HospitalXi'an 710016Shaanxi ProvinceChina

BACKGROUND Hoffa’s fracture is a coronal-oriented fracture of the femoral *** is rarely observed in pediatric patients that isolated coronal fracture of the medial femoral condyle accompanies an intact lateral femoral *** a few cases involving Hoffa’s fracture of the medial femoral condyle have been reported in patients with undeveloped *** a fracture cannot be observed by routine imaging examinations,thus resulting in possible misdiagnosis and further treatment *** SUMMARY A 5-year-old boy with Hoffa’s fracture of the medial femoral condyle suffered from right knee pain and severe swelling after being hit by a heavy *** patient was misdiagnosed and initially treated in a local primary healthcare *** improvement in his right knee’s extension was observed following conservative treatment for 2 *** patient was transferred to our hospital,rediagnosed using arthroscopy,and underwent open reduction and internal *** therapeutic outcome was satisfactory with the screws removed 7 mo after *** the final follow-up of 40 mo,the range of motion in the knee had *** was no varus-valgus *** Hoffa’s fracture is rarely seen in children aged 5 years,let alone in the medial condyle,and can easily be misdiagnosed due to limited physical and imaging *** Hoffa’s fracture in preschool children should be confirmed based on arthroscopic *** reduction and internal fixation should be performed to protect the articular surface and prevent long-term complications.

关键词： Hoffa’s fracture Pediatrics Medial femoral condyle Missed diagnosis Arthroscopy Open reduction-internal fixation Case report

Involvement of unusual noncovalent interactions in the self-assembly of cucurbit[6]uril with [CdCl_4]^(2-) anions

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Chinese Chemical Letters 2016年第1期27卷 173-177页

作者： Xiao-Wei Cui Shi-Yan Chen Chuan-Zeng Wang Wen-Xuan Zhao Tao Sun Xin-long ni Yun-Qian Zhang Zhu Tao Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province Guizhou University Key Laboratory of Guizhou High Performance Computational Chemistry Guizhou University

The [CdCl_4]^（2-） anion as a structure inducer has proved to be useful in the construction of cucurbit[n]urilmetal coordination architectures and materials. In order to better understand the role and influence of the structure inducer in Q[n] systems, we report herein the self-assembly of Q[6] solely in the presence of[CdCl_4]^（2-）anions and in the presence of both a linear cationic organic guest and [CdCl_4]^（2-）anions. X-ray diffraction analysis revealed that 1D Q[6] porous channels were formed by the noncovalent interactions between Q[6] and [CdCl_4]^（2-）anions, but the ＇＇honeycomb effect＇＇ was not observed in the present ***, it seems that the ＇＇honeycomb effect＇＇ and the self-assembly of Q[6] with [CdCl_4]^（2-）anions can be significantly modified and switched in the presence of a linear cationic dibutylamine guest through some unusual noncovalent interactions.

关键词： Cucurbituril [CdCl_4]^(2-) anions Cationic guest Honeycomb effect Assembly

Effects of surface modification on isothermal oxidation behavior of HVOF-sprayed niCrA1Y coatings

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Progress in Natural Science:Materials International 2011年第2期21卷 173-179页

作者： Li-yong ni,Zi-long WU,Chun-gen ZHOU Key Laboratory of Aerospace Materials and Performance(Ministry of Education), Department of Materials Science and Engineering,Beihang University,Beijing 100191,China Key Laboratory of Aerospace Materials and Performance (Ministry of Education) Department of Materials Science and Engineering Beihang University Beijing 100191 China

niCrAlY coatings were deposited on ni-based superalloy by high-velocity oxygen-fuel spraying(HVOF).Surface modification by means of grit-blasted,shot-peened and ground methods was used in order to study the effect of surface conditions on the isothermal oxidation behavior of HVOF-sprayed niCrAlY coatings at 1 050℃.The results showed that surface modification had an obvious effect on the isothermal oxidation behavior of the *** was a large decrease in growth rate compared with the as-sprayed *** scale formed on the grit-blasted and shot-peened coatings was a mixture of Al2O3and niCr2O4,while the oxide formed on the ground coating was composed mainly of *** surface modification,the content of niCr2O4spinels decreased compared with the as-sprayed coating.

关键词： niCrAlY HVOF isothermal oxidation thermal barrier coating