mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Culling phenotypically inferior trees in seed production area enhances seed and seedling quality of Acacia auriculiformis

Improvement in seed and seedling quality of Acacia auriculiformis after culling phenotypically inferior trees was studied in a 6-year old seed production area(SPA).A 5-ha plantation was identified,of which 2.3 ha was converted into SPA.The initial stocking,1 612 trees·ha~(-1), was thinned down to 982 trees·ha~(-1) based on growth characteristics. The following fruiting season, seeds were collected from 10 randomly selected trees in culled and non-culled stands, and seed physical characters, germination and seedling traits were assessed. Seed weight, seed thickness and percentage germination increased by 32.1%,4.43% and 22.37%, respectively in the culled stand compared to the non-culled stand. Culling also increased the speed of germination, seedling dry weight and seedling vigor index. Heritability values were high for seed weight(0.974)and seed thickness(0.948)while medium values were observed for percentage germination(0.577)and total dry weight(0.534). Predicted genetic gain was 11.13%and 11.22%for seed weight and percentage germination, respectively. The actual gain was 32.1,51.9 and 22.9%for seed weight, percentage germination and total dry matter, respectively. In conclusion,SPAs established by culling inferior trees could serve as sources of good quality seeds for reforestation programs until genetically improved seeds are made available
Influence of cytokinins, basal media and pH on adventitious shoot regeneration from excised root cultures of Albizia lebbeck

A highly reproducible and efficient in vitro shoot regeneration system was developed in a potential medicinal plant, Albizia lebbeck using root explants. Root explants from 15 day-old-aseptic seedlings were cultured on Murashige and Skoog(MS)medium supplemented with different concentrations(0.5,2.5,5.0,7.5 and 10.0μM)of 6-Benzyladenine(BA), Kinetin(Kn),2-Isopentenyl adenine(2-iP)singly as well as in combination withα-Naphthalene acetic acid(NAA)(0.1,0.5,1.0,1.5 and 2.0μM).The highest rate of shoot multiplication(16.0±1.87 for the average shoot number and 5.16±0.38 cm for shoot length)was achieved on MS medium supplemented with 7.5μM BA and 0.5μM NAA.The effects of medium type, medium strength,pH and subculture on shoot induction and proliferation were also tested. An average of 21.6±2.87 shoots per explants could be obtained following this protocol. Rooting was achieved on microshoots using half strength MS medium with 2.0μM Indole-3-butyric acid(IBA) after four weeks of culture. The in vitro raised healthy plantlets were successfully established in earthen pots containing garden soil and grown in greenhouse with>80%survival rate
Effects of different treatments on seed germination and breaking seed dormancy of Prosopis koelziana and Prosopis Juliflora

For improving seed germination of Prosopis koelziana and Prosopis juliflora, different treatments of seeds were conducted, including scarification with sulfuric acid 98%for 10 and 15 min, sandy paper, hot water for 5 and 10 min, potasium nitrate 0.1%, gibberellic acid at 250 mg·L~(-1) and 500 mg·L~(-1) and combinational treatment of scarification with gibberellic acid of 250 mg·L~(-1) and 500 mg·L~(-1).The results show that scarifications with sandy paper and sulfuric acids 98%were the most effective treatments on breaking seed dormancy and seed germination induction. Scarification with sulfuric acid 98%for 15 min was the best treatment. According to the positive effect of scarification and lack of reaction of seeds against KNO_3 and gibberellic acid, the kind of seed dormancy was determined as exogenous
Population status and regeneration of a tropical clumping bamboo Schizostachyum dullooa under two management regimes

Schizostachyum dullooa(Gamble)Majumder'dolu bamboo'is a thin walled sympodial moderate sized to large tufted bamboo, dominant in the successional fallows of northeast India. The impact of resource management on productivity and sustainability of the species was evaluated by investigating the population status and regeneration in Cachar tropical semi evergreen forest under private property resource management(PPRM)and common property resource management(CPRM) regimes. Population status revealed current-year, one-year, two-year and three-year-old culms contribute 54%,24%,16%and 6%of the total culms per clump, respectively, under PPRM. Three-year-old culms were absent in CPRM and population status was thus represented by current year(83%), one-year(16%)and two-year(1%)old culms. Net change, rate of change and%gain in population for different age classes showed the prevalence of management practices under CPRM was unscientific. Efficiency of new culm production per clump used as an index of regeneration was 69.7%in PPRM and 59.88%in CPRM.New culms produced under CPRM were small and thin. We conclude that CPRM is inappropriate for a long term economic and ecological sustainability of the species and alternative management protocols are needed for conservation of the species
Scenario-based assessment of future food security

This paper presents a scenario-based assessment of global future food security. To do that, the socio-economic and climate change scenarios were defined for the future and were linked to an integrated modeling framework. The crop yields simulated by the GIS-based Environmental Policy Integrated Climate(EPIC)model and crop areas simulated by the crop choice decision model were combined to calculate the total food production and per capita food availability, which was used to represent the status of food availability and stability. The per capita Gross Domestic Product(GDP)simulated by IFPSIM model was used to reflect the situation of food accessibility and affordability. Based on these two indicators, the future food security status was assessed at a global scale over a period of approximately 20 years, starting from the year 2000.The results show that certain regions such as South Asia and most African countries will likely remain hotspots of food insecurity in the future as both the per capita food availability and the capacity of being able to import food will decrease between 2000 and 2020.Low food production associated with poverty is the determining factor to starvation in these regions, and more efforts are needed to combat hunger in terms of future actions. Other regions such as China, most Eastern European countries and most South American countries where there is an increase in per capita food availability or an increase in the capacity to import food between 2000 and 2020 might be able to improve their food security situation
变截面微纳米通道内聚乙烯分子注射过程的分子动力学模拟

采用分子动力学方法模拟了变截面微纳米通道内聚乙烯分子的注射过程,分析了微纳米通道截面结构及外加作用力对注射过程中聚乙烯分子流变和结构特性的影响.研究结果表明:注射流动过程中,通道壁面附近存在粒子吸附层,且吸附层厚度随通道锥面倾角增大而增大;聚乙烯分子链的注射距离随锥面倾角增大而减小,随外加作用力增大而增大;在锥面倾角为α=45°的通道中聚乙烯分子均匀填充整个通道,且沿流动方向上出现单轴拉伸现象,在较大作用力情况下,该拉伸更为显著,使得注射过程更容易完成
孤立系统内传热过程的(火积)减原理

从热力学第一,第二定律出发,基于熵的概念,可以得出孤立系统的熵增原理和孤立系统,定温定容系统等的热平衡判据.本文基于火积的概念,得出了孤立系统内传热过程的火积减原理,发现在孤立系统内的热量传递过程中,火积总是减小的,该原理可以视为热力学第二定律在传热过程中的一种表述.本文还得到了孤立系统和封闭系统的热平衡判据,即最小火积原理和最小自由火积原理,发现孤立系统在达到热平衡时系统的火积最小,而封闭系统在热平衡状态下自由火积最小.这就表明,在传热过程中,火积和熵一样,都可以作为时间之矢,指出其发展方向;而且,火积也可以用于描述系统的平衡态
Past, present and future of the Resonant-Mass gravitational wave detectors

Resonant-mass gravitational wave detectors are reviewed from the concept of gravitational waves and its mathematical derivation, using Einstein's general relativity,to the present status of bars and spherical detectors, and their prospects for the future, which include dual detectors and spheres with non-resonant transducers. The review not only covers technical aspects of detectors and sciences that will be done, but also analyzes the subject in a historical perspective, covering the various detection efforts over four decades, starting from Weber's pioneering work
A new model analysis of the third harmonic voltage in inductive measurement for critical current density of superconducting films

The critical current density Jc is one of the most important parameters of high temperature superconducting films in superconducting applications, such as superconducting filter and superconducting Josephson devices. This paper presents a new model to describe inhomogeneous current distribution throughout the thickness of superconducting films applying magnetic field by solving the differential equation derived from Maxwell equation and the second London equation. Using this model, it accurately calculates the inductive third-harmonic voltage when the film applying magnetic field with the inductive measurement for J_c. The theoretic curve is consistent with the experimental results about measuring superconducting film, especially when the third-harmonic voltage just exceeds zero. The J_c value of superconducting films determined by the inductive method is also compared with results measured by four-probe transport method. The agreements between inductive method and transport method are very good
Electro-optical properties of polymer stabilized cholesteric liquid crystal film

Liquid crystals (LCs) and polymers are extensively used in various electro-optical applications. In this paper, normal mode polymer stabilized cholesteric LC film is prepared and studied. The effects of chiral dopant and monomer concentrations on the electro-optical properties, such as contrast ratio, driving voltage, hysteresis width and response time, are investigated. The reasons of electro-optical properties influenced by the concentrations of the materials are discussed. Through the proper material recipe, the electro-optical properties of polymer stabilized cholesteric LC film can be optimized
The universal sound velocity formula for the strongly interacting unitary Fermi gas

Due to the scale invariance, the thermodynamic laws of strongly interacting limit unitary Fermi gas can be similar to those of non-interacting ideal gas. For example, the virial theorem between pressure and energy density of the ideal gas P = 2E/3V is still satisfied by the unitary Fermi gas. This paper analyses the sound velocity of unitary Fermi gases with the quasi-linear approximation. For comparison, the sound velocities for the ideal Boltzmann, Bose and Fermi gas are also given. Quite interestingly, the sound velocity formula for the ideal non-interacting gas is found to be satisfied by the unitary Fermi gas in different temperature regions
地球何时进入下一个冰期

从第四纪开始至今的2.5Ma气候特征为冰期-间冰期旋回.在100ka旋回中,间冰期长者可持续近30ka,而短者不足10ka.目前的间冰期已持续了11.5ka,显然面临着间冰期结束的威胁
Microarray-based identification of tomato micro RNAs and time course analysis of their response to Cucumber mosaic virus infection

A large number of plant micro RNAs(miRNAs)are now documented in the miRBase, among which only 30 are for Solanum lycopersicum(tomato). Clearly, there is a far-reaching need to identify and profile the expression of miRNAs in this important crop under various physiological and pathological conditions. In this study,we used an in situ synthesized custom microarray of plant miRNAs to examine the expression and temporal presence of miRNAs in the leaves of tomato plants infected with Cucumber mosaic virus(CMV). Following computational sequence homology search and hairpin structure prediction,we identified three novel tomato miRNA precursor genes. Our results also show that,in accordance with the phenotype of the developing leaves, the tomato miRNAs are differentially expressed at different stages of plant development and that CMV infection can induce or suppress the expression of miRNAs as well as up-regulate some star miRNAs(miRNA*s)which are normally present at much lower levels. The results indicate that developmental anomalies elicited by virus infection may be caused by more complex biological processes
46,XX男性综合征的遗传学诊断和临床分析

46,XX男性综合征,亦称46,XX男性性反转综合征.性反转综合征是一类罕见的性分化异常疾病,分为46,XX男性和46,XY女性(Swyer综合征)两型[1-2].2006年欧洲儿科内分泌学会建议将46,XX男性综合征更名为46,XX性发育睾丸疾病(tes-ticular disorder of sex devolepment).46,XX男性综合征在新生儿中的发生率约为1/20000[3],患者表型为男性,体型正常,平均身高较正常人略低,睾丸小而硬,青春期后无精子发生,约有10%的患者伴有尿道下裂或外生殖器两性畸形,部分患者出现男性女性化乳房.此类患者由于没有生育障碍以外的问题,不易发现,报道较少[4]
脑瘫患儿全麻术后并发恶性高热1例报道

MH是由吸入麻醉药,静脉麻醉药和去极化肌松药触发的骨骼肌内钙离子水平失调为特征的常染色体显性遗传病[2].MH无明显种族特异性,发病率为1∶15000~1∶50000,存在遗传学异常者高达1∶3 000~1∶4500[3],男性多于女性,好发年龄10~30岁, Chamley等[4]报道病例中小于15岁者占52.1%,国内报道最小年龄为22 d新生儿[5].本病的发生难以预见,病死率极高[1-2],诊治困难,应引起临床重视
蛋白激酶B在乙型肝炎病毒感染原发性肝细胞癌组织中的表达及临床意义

目的:探讨蛋白激酶B(PKB/Akt)在乙型肝炎病毒(HBV)感染原发性肝细胞癌组织中的表达及及临床价值.方法:采用SP免疫组化法,检测35例HBV感染原发性肝细胞癌(HBV肝癌),乙肝后肝硬化和正常肝组织中PKB/Akt的表达.结果: HBV肝癌组和肝硬化组PKB阳性表达率分别为94.3%和66.7%,显著高于对照组(40.0%),有统计学差异(P<0.05);HBV肝癌组阳性表达率显著高于肝硬化组(P<0.05);肿瘤浸润和淋巴结转移组织中PKB/Akt阳性表达率显著高于无肿瘤浸润和淋巴结转移组织(P<0.05),PKB/Akt阳性表达率在性别,年龄,肿瘤大小和肿瘤分化程度等病理因素之间比较差异无统计学意义(P>0.05).结论: PKB/Akt在HBV肝癌组织中呈高表达,PKB/Akt在HBV肝癌的肿瘤浸润,淋巴结转移的机制中起着重要的作用
异丙酚对开腹胃癌根治术患者术后早期认知功能和炎症因子的影响

目的:异丙酚对行胃癌根治术患者炎性细胞因子水平和术后认知功能的影响,为降低术后认知功能障碍(POCD)的发生提供理论参考.方法:60例拟择期行开腹胃癌根治手术的患者分为观察组和对照组.对照组采用七氟醚吸入麻醉,观察组采用异丙酚全凭静脉麻醉.分别于麻醉诱导前10min(T0),麻醉诱导后10min(T1),手术切皮时(T2),手术结束时(T3)4个时点测定血清IL-6和TNF-α的含量;手术前(术前),术后第2天(术后)对两组患者进行神经精神功能测试并计算术后POCD的发生率.结果:观察组T1~T3三个时点血清IL-6和TNF-α水平与对照组比较显著下降(P<0.05),到T3时点血清IL-6和TNF-α水平基本达到T0水平;观察组术前术后神经精神测试评分比较差异无统计学意义(P>0.05),而对照组术后神经精神测试评分与术前比较显著下降(P<0.05);观察组术后POCD发生率为16.7%,显著低于对照组(33.3%),相比较有统计学差异(P<0.05).结论:异丙酚能减少行胃癌根除术患者术后早期IL-6和TNF-α的释放,抑制炎症反应,并能明显减少术后早期认知功能障碍的发生
肝局灶性结节增生的综合影像诊断及病理分析

目的: 探讨肝局灶性结节增生(FNH)的CT、MRI及超声造影表现, 以提高FNH诊断的准确性. 方法: 回顾性分析12例经病理及随访证实的FNH影像学资料, 所有病例均行B超、CT、MRI检查, 其中超声造影6例. 结果: FHN病灶B超均呈稍低回声, 超声造影时动脉呈中央向周边快速增强, 门脉期、延迟期回声逐渐均匀, 高于正常肝组织. 病灶CT平扫呈低密度7个, 等密度5个. MRI平扫T1WI低信号8个, 等信号4个; T2WI均呈高或稍高信号. 病灶动脉期CT及MRI均明显强化. 门脉期CT显示7个等密度, 4个稍高密度, 1个为略低密度; 延迟期9个等密度, 2个稍高密度, 1个稍低密度; MRI显示高信号9个, 等信号 3个; 延迟期高信号8个, 等信号4个. CT扫描示8个病灶有中央瘢痕, 5个周边有扭曲、增粗血供, 3个有假包膜. MRI扫描示 8个病灶有中央瘢痕, 5个周边有扭曲、增粗血供, 3个有假包膜. MRI扫描示9个病灶有中央瘢痕, 5个周边有扭曲, 增粗血供, 3个有假包膜. CT正确诊断4例(4/12), MRI为6例(6/12), 超声造影为5例(5/6). 结论: CT及MRI增强扫描可充分反映FNH的供血特点及病理特征, 在FNH诊断与鉴别诊断中具有重要的价值. FNH的"离心性强"的超声造影特点, 可提高诊断的准确率
内镜下经十二指肠乳头引流治疗与主胰管相通的胰腺假性囊肿

目的: 内镜下经十二指肠乳头引流治疗与主胰管相通的胰腺假性囊肿, 探讨交通性胰腺假性囊肿的内镜治疗效果. 方法: 回顾分析22例交通性胰腺假性囊肿经十二指肠乳头引流, 观察术后囊肿消退及临床症状改善情况. 结果: 治疗后20例患者囊肿消退及症状明显改善, 1例囊肿3个月后复发, 再行引流, 1例引流3天后囊肿消退, 但5天后引流管堵塞, 原有囊肿复发, 且新的部位(胰尾部)亦出现囊肿, 转外科手术. 结论: 经十二指肠乳头引流治疗与主胰管相通的胰腺假性囊肿, 安全有效, 可作为首选的治疗方法
离退休干部的老化态度及其与心理健康状况的关系

目的调查离退休老干部的老化态度与其心理健康状况的关系.方法采用中文版老化态度问卷(AAQ),UCLA孤独量表,焦虑自评量表(SAS),纽芬兰纪念大学幸福度量表(MUNSH)对87名离退休干部进行测查.结果①离退休干部的老化态度在性别和年龄组之间没有显著差别;②男性离退休干部与社区男性老人的老化态度差异不显著;在积极和消极维度的老化态度得分上,女性离退休干部比社区女性老人都低且差异显著.③心理社会丧失维度得分与孤独得分,焦虑得分呈显著正相关,心理获得得分与其相关不显著.结论离退休干部老化态度比较积极,相对更平和;离退休干部对变老的消极体验能够显著预测其具体的负性心理状态,如孤独和焦虑;而积极的老化体验却未显示出与心理健康指标的明显关联
姜黄素对喉癌Hep-2细胞的诱导凋亡作用及细胞周期的影响

目的探讨姜黄素对人喉癌Hep-2细胞的诱导凋亡作用及其对细胞形态及细胞周期各时相的影响.方法 Hep-2细胞暴露于含姜黄素(0~25μmol/L)的培养基中,分别培养24h及48h,用吖啶橙染色法(AO染色法)检测对细胞形态的影响;用流式细胞术检测对细胞周期各时相及凋亡率的影响.结果 AO染色法显示,姜黄素可诱导Hep-2细胞形态发生明显变化,呈时间-剂量依赖性;FCM结果显示,姜黄素可使Hep-2细胞S期细胞数明显减少,并诱导细胞出现典型的凋亡峰,凋亡率呈时间-剂量依赖性.结论姜黄素可诱导喉癌Hep-2细胞呈典型的凋亡形态,诱发凋亡峰,使Hep-2细胞阻滞在G2/M期
骨肉瘤相关信号转导通路研究进展

骨肉瘤是一种常见于青少年的恶性肿瘤,病死率及致残率极高.在骨肉瘤原发灶进展及转移过程中,诸多信号通路参与其中.由于骨肉瘤临床表现缺乏特异性,因此常在疾病晚期才得以确诊,近年来骨肉瘤相关信号转导通路的研究越来越受到重视,分子遗传学及细胞遗传学技术的发展为探求骨肉瘤的发病机理提供了新的研究方向.本文对相关问题进行综述
Selective hydrogenation of benzene to cyclohexene on Ru-based catalysts promoted with Mn and Zn

Ru-based catalysts promoted with Mn and Zn were prepared by a co-precipitation method. In liquid-phase hydrogenation of benzene, the Ru-Mn-Zn catalysts exhibited superior catalytic performance to the catalysts promoted with Zn or Mn alone. The optimum Mn/Zn molar ratio was determined to be 0.3. With the addition of 0.5 g NaOH, the Ru-Mn-Zn-0.3 catalyst, which was reduced at 150℃, afforded a cyclohexene selectivity of 81.1%at a benzene conversion of 60.2%at 5 min and a maximum cyclohexene yield of 59.9%at 20 min. Based on characterizations, the excellent performance of Ru-Mn-Zn catalyst was ascribed to the suitable pore structure, the appropriate reducibility and the homogenous chemical environment of the catalyst
Preparation and properties of magnetic alumina microspheres with a γ-Fe_2O_3/SiO_2 core and Al_2O_3 shell

Magnetic alumina composite microspheres withγ-Fe_2O_3 core/Al_2O_3 shell structure were prepared by the oil column method. A dense silica layer was deposited on the surface of γ-Fe_2O_3 particles(denoted asγ-Fe2O3/SiO2)with a desired thickness to protect the iron oxide core against acidic or high temperature conditions.γ-Fe_2O_3/SiO_2/Al_2O_3 particles with about 85 wt%Al_2O_3 were obtained and showed to be suitable for practical applications as a magnetic catalyst or catalyst support due to their magnetic properties and pore structure. The products were characterized with scanning electron microscope(SEM)and transmission electron microscope(TEM), nitrogen adsorption-desorption, and vibrating sample magnetometer(VSM).The specific surface area and pore volume of the γ-Fe_2O_3/SiO_2/Al_2O_3 composite microspheres calcined at 500℃ were 200 m~2/g and 0.77 cm~3/g, respectively
Study of CO adsorption on perfect and defective pyrite(100) surfaces by density functional theory

First-principles calculations based on density functional theory(DFT)and the generalized gradient approximation(GGA)have been used to study the adsorption of CO molecule on the perfect and defective FeS_2(100)surfaces. The defective Fe2S(100)surfaces are caused by sulfur deficiencies. Slab geometry and periodic boundary conditions are employed with partial relaxations of atom positions in calculations. Two molecular orientations,C-and O-down,at various distinct sites have been considered. Total energy calculations indicated that no matter on perfect or deficient surfaces, the Fe position is relatively more favored than the S site with the predicted binding energies of 120.8 kJ/mol and 140.8 kJ/mol, respectively. Moreover,CO was found to be bound to Fe atom in vertical configuration. The analysis of density of states and vibrational frequencies before and after adsorption showed clear changes of the C-O bond
Kinetics modeling for the mixed reforming of methane over Ni-CeO_2/MgAl_2O_4 catalyst

Kinetics model was developed for the mixed(steam and dry)reforming of methane, which is useful for the control of H_2/CO ratio. The equilibrium constants of reaction rate were determined using the experimental equilibrium data at different reaction temperatures, while the forward reaction rate constants were estimated using the experimental data under non-equilibrium(high inert fraction and high space velocity) conditions. The comparison between calculated and experimental data clearly showed that the developed model described satisfactorily, and further analysis using the parametric sensitivity determined the wall temperature and CO_2 fraction in the feed gas as effective parameters for the manipulation of CH_4 conversion and H_2/CO ratio of synthesis gas under the equilibrium condition. Meanwhile, the inert fraction, rather than the residence time, was selected as additional parameter under non-equilibrium condition
Comparison and application of different empirical correlations for estimating the hydrate safety margin of oil-based drilling fluids containing ethylene glycol

As the oil and gas industries continue to increase their activity in deep water, gas hydrate hazards will become more serious and challenging, both at present and in the future. Accurate predictions of the hydrate-free zone and the suitable addition of salts and/or alcohols in preparing drilling fluids are particularly important both in preventing hydrate problems and decreasing the cost of drilling operations. In this paper,we compared several empirical correlations commonly used to estimate the hydrate inhibition effect of aqueous organic and electrolyte solutions using experiments with ethylene glycol(EG)as a hydrate inhibitor. The results show that the Najibi et al. correlation(for single and mixed thermodynamic inhibitors)and the Ostergaard et al. empirical correlation(for single thermodynamic inhibitors)are suitable for estimating the hydrate safety margin of oil-based drilling fluids(OBDFs)in the presence of thermodynamic hydrate inhibitors. According to the two correlations, the OBDF, composed of 1.6 L vaporizing oil,2%emulsifying agent,1%organobentonite,0.5%SP-1,1%LP-1,10%water and 40%EG, can be safely used at a water depth of up to 1900 m. However, for more accurate predictions for drilling fluids, the effects of the solid phase, especially bentonite,on hydrate inhibition need to be considered and included in the application of these two empirical correlations
Adsorption of cyclohexene and its dehydrogenation intermediates on nAu/Pt(100)(n=0,1,2)surfaces: A DFT study

Adsorption of cyclohexene and its dehydrogenation intermediates on the nAu/Pt(100)(n=0,1,2 means clean Pt, one monolayer and two layers of Au covered Pt surfaces, respectively.)has been investigated by self-consistent(GGA-PW91)density functional theory combined with periodic slab model. It is found that on the clean platinum, there are two kinds of favorable adsorption sites,i.e., hollow sites and bridge sites, and the adsorption energy at the hollow site is larger than that at the bridge site. However,on the Au/Pt and 2Au/Pt surfaces, there are three kinds of adsorption sites, and the adsorption energies are alike at both the bridge site and the top site. The magnitude order of the adsorption energies is as follows:clean Pt>Au/Pt>2Au/Pt.The configurations of cyclohexene molecule have been distorted a little during the geometry optimizations. The lengths of C-M(M=Pt or Au,on the top layer of the slab)bonds are closely related to the corresponding adsorption energies
Catalytic properties of Cu-Co catalysts supported on HNO_3-pretreated CNTs for higher-alcohol synthesis

HNO_3-pretreated CNTs were employed as supports, and a special ultrasound-assisted impregnation method was designed to prepare supported Cu-Co catalysts for higher-alcohol synthesis from syngas. The catalysts used in this work were characterized by N2 adsorption-desorption, TEM,XRD,H_2-TPR,CO-TPD techniques. It was found that the pre-treatment procedure of CNTs remarkably promoted the catalytic properties of the Cu-Co/CNTs catalysts. For the Cu-Co catalyst supported on CNTs pre-treated by 68 wt%HNO_3, some active components were introduced into the CNTs channels, their dispersions and the amount of strongly adsorbed CO-species were improved. The CO conversion and alcohol yield on the HNO3-pretreated Cu-Co/CNTs catalyst were increased by~21%and~69%, respectively, compared with those on the normal Cu-Co/CNTs catalyst
中西医结合临床教学现状?存,问题及对策

临床教学是医学院校教学活动的一个重要环节,是从课堂教学步入临床实践的重要过程,是人才培养的重要阶段?临.教学质量是衡量高等医学院校办学能力和办学水平的重要标志,直接关系到毕业生的培养质量?从.十余年中西医结合发展历程来看,中西医结合取得突破性成就及大量成熟经验和成果者主要在于临床?临.专业课应该是引导学生走中西医结合道路最好的途径,是中西医结合的重要切入点和突破口?因.,中西医结合临床教学对培养中西医结合人才尤为重要?由.开办全日制中西医结合院校教育的历史短暂,各院校在中西医结合临床教学过程中常常遇到各种问题,出现种种困惑,影响了中西医结合人才的培养,制约着中西医结合教育的发展?为.,围绕中西医结合临床教学现状及存在问题我们于2008年12月—2009年4月对从事中西医结合教育的10所院校和19家大学附属医院发放调查问卷100份,收回83份?调.对象包括从事中西医结合教育管理的领导(院系副主任以上,行政处室副职以上,不包括教研室主任)2位,从事中西医结合临床教学的教师58位?下.对调查结果进行分析?探,,并寻求对策
大力推进新疆大规模综合能源基地的发展

新疆能源资源丰富,地缘位置特殊,在国家的能源储备,能源供给,能源安全和能源通道等方面具有重要的战略地位.本文叙述了发展新疆综合能源基地的主要内容,新疆综合能源基地建设设想和推进新疆大规模综合能源基地发展的主要建议
柔性承插PE管在某供水工程中的应用

结合PE管柔性承插技术在深圳市安乐花园管网改造工程中的应用,详细介绍了PE管热熔连接和柔性承插连接两种技术的优势和缺陷,探讨了两种技术在供水管网工程中的应用前景,提出了PE管柔性承插连接技术在工程应用中的技术要求
电动四通蝶阀在某电厂中的应用

电动四通蝶阀是一种流体换向阀门.介绍了电动四通蝶阀在某电厂改扩建工程中的应用,其应用简化了阀门设置,方便了操作,易于实现正常供水,备用供水,模糊供水等工况的切换
航空食品配餐楼项目设计要点分析

航空食品配餐楼属于机场附属设施中的一类工业项目,该类项目与一般的工业,民用项目在设计上有很大不同.对该类项目给排水系统的设计要点和难点如给水水质,用水定额,供水安全性,热水循环系统设计,隔油装置的设计等进行介绍和分析,为设计人员设计同类项目时提供参考
卓越皇岗世纪中心电全蓄热中央热水系统设计

电锅炉全蓄热系统在微观上结合供电电价在不同时段不同价格的特点,为用户节约了运行费用;在宏观上,为电网起到移峰填谷的作用,有益于电网的安全,经济运行.对卓越皇岗世纪中心3号楼商务公寓选用电锅炉全蓄热系统的优越性,选型方案,负荷计算,加热原则,工艺设计流程和运行原理等问题进行阐述
电信机楼消防设计探讨

结合多个电信机楼工程消防设计的经验,对电信机楼消防设计中最核心,复杂的气体灭火系统设计进行总结,如灭火气体的选择,系统的保护区域,系统设计要点,并对系统设计中需要注意的问题如防火分区划分,组合分配系统的设定等进行阐述,供设计参考
太阳能集中热水供应系统的合理设计探讨

合理选择设计计算参数,太阳能集热系统,集热器产品及配套设备,附件,系统规模,防过热,防冻等措施,以及与建筑等专业的密切配合,精心安装施工,是一个成功的太阳能集中热水供应系统的重要保证.对上述内容进行详细介绍,供设计参考
几起建筑屋面雨水倒灌事故原因分析及对策

针对几起建筑屋面雨水排水出现问题的原因进行分析,并提出相应的解决办法,如屋面排水不得采用地漏代替雨水斗;屋面排水系统必须设置溢流措施等.提出重要的大型公共建筑有必要设置屋面积水监测报警装置
供水管网漏损控制理论研究进展

介绍了爆管估计,固定和变化面积出流的概念,以及执行水量漏损降低的策略和措施.回顾了供水水量平衡分析,供水服务性能指标,控制措施优先性排序及供水平衡软件的相关内容.管网漏损控制作为供水管网管理的重要考核指标,其理论分析和研究是目前面临的一项重要任务
基于泵站运行记录推求污水入流量过程线

提出基于水泵工作曲线和吸水池水位的变化推求污水入流过程线的方法.得到的入流量和入流过程线能够清晰地分析泵站进水情况,可以为校核排水管网模型提供较为准确的数据,并为提高泵站的控制管理水平提供一定的参考
NaOH在电厂循环排污水回用处理工程中的应用

因节水需要,河北某电厂回用水系统将原水由水库水改为循环排污水,因此需要对原工艺进行优化.因占地面积,成本等原因无法投建石灰处理系统,故将澄清池投药改为NaOH.对投加NaOH的运行效果,影响因素,经济性进行了分析讨论,实践证明投加NaOH能保证系统的稳定运行,出水水质满足回用要求