An Enhanced Beetle Antennae Search Algorithm Based Comprehensive Water Quality Index for Urban River Water Quality Assessment

Water Resources Management - Urban river not only has the important function in urban hydrological environment, but also is an area for entertainment. Water quality assessment is the core technique...     

一种适用于继电保护在线整定的极小断点集求取算法

复杂环网中继电保护在线整定的顺利进行依赖于极小断点集的快速求取,但现有极小断点集求取算法在算法复杂度、断点集维数及计算效率等方面还存在不足。对此,提出了一种适用于继电保护在线整定的极小断点集求取算法。该方法基于图论中基本割集矩阵与基本回路矩阵的固有关系,将复杂环网的断点集求取问题转换成了基于基本割集矩阵的基本回路断点集求取问题。通过动态调整基本割集矩阵,逐步计算得到网络极小断点集。算例分析表明,所提算法能够在有效的时间内求得网络极小断点集,大大降低了问题的复杂性。     

新辅助化疗对胃癌手术患者罗库溴铵药效学影响

目的:观察新辅助化疗对胃癌手术患者罗库溴铵药效学影响。方法:50例择期行开放胃癌根治术患者,ASA分级Ⅰ或Ⅱ,性别不限,年龄40～68岁,体质量56～79 kg,25例术前未做化疗（N组）,25例术前行新辅助化疗（C组）。静脉诱导患者入睡后,给予罗库溴铵0.9 mg/kg,当4次成串刺激（TOF）为0时插入气管导管,T1恢复至对照值25%时追加罗库溴铵0.15 mg/kg。记录罗库溴铵起效时间（给药至T1为0时间,t1）、首剂作用时间（首次给药至T1达25%时间,t2）、临床肌松时间（T1从0恢复至25%时间,t3）、恢复指数（T1从25%恢复至75%所需时间,RI）和拔管时间（停用肌松药至T4/T1恢复至90%时间,t4）和罗库溴铵的总用量。结果:与N组相比,C组肌松药首次作用时间延长,临床肌松时间延长,术中总用量减少,恢复指数和拔管时间延长（P<0.05）。两组患者起效时间无统计学差异（P>0.05）。结论:新辅助化疗可减少术中肌松药的使用量。     

关于在引黄太原供水区设立地下水禁采区问题的研究

引黄工程通水后，在供水区设立地下水禁采区、限采区,用引黄置换超采的地下水开采量，实现供水区水环境的改善、地下水资源的可持续利用和引黄工程的良性运营。     

Morphology modulation of polymeric assemblies by guest drug molecules: TEM study and compatibility evaluation

Amphiphilic copolymers with poly(N-isopropylacrylamide) and ethyl tryptophan, ethyl 4-aminobenzoate, or ethyl glycinate as side groups were synthesized. Assemblies based on these copolymers were employed as model systems to investigate the morphology transformation upon loading of various hydrophobic drugs. TEM observation suggested that the loading of non-steroidal anti-inflammatory drugs, including ibuprofen, ketoprofen, indomethacin, naproxen and mefenamic acid, can trigger a significant morphological transformation of assemblies based on copolymers with low substitution of hydrophobic group. On the other hand, the introduction of steroidal anti-inflammatory drugs (medroxyprogesterone acetate, prednisone acetate and dexamethasone) and aliphatic acids (caprylic acid, tetradecanoic acid and stearic acid) has no significant effect on the morphology of assemblies derived from the same copolymers, although they do have some effect on the morphology of assemblies based on copolymers with high content of hydrophobic group. In addition, the morphology of assemblies is well correlated with drug loading efficiency. An occurrence of morphology transformation means a higher drug loading, and vice versa. Various physicochemical parameters including partition coefficient, molecular volume and solubility parameters were calculated according to group contribution method. Analysis of these data pointed to the fact that a combination of molecular volume and solubility parameters can be used as a measure to judge whether one molecule is ‘active’ or ‘neutral’. This rule can also be applied to evaluate the compatibility between candidate drugs and nanocarriers based on these copolymers.     

A high strength,wear and corrosion-resistant,antibacterial and biocompatible Nb-5 at.％ Ag alloy for dental and orthopedic implants

Refractory metal niobium (Nb) incorporated with a small amount of silver (Ag),the resulting Nb-Ag two-phase alloys,were fabricated by mechanical alloying and spark plasma sintering.The microstructure,mechanical properties,wear resistance,corrosion behavior,in vitro and in vivo antibacterial properties and biocompatibility of the Nb-Ag alloys were systematically investigated.The results show that the mechanical properties,wear resistance,corrosion resistance and antibacterial ability were significantly enhanced after addition of 5 at.％ Ag.The fabricated Nb-5 at.％ Ag alloy demonstrates high yield strength of up to ～ 1486 MPa and fracture strain of ～ 35 ％.The precipitated Ag particles could reduce friction and wear.The enhanced corrosion resistance was attributed to the higher relative density of the sintered alloys and the formation of a stable and dense passive film of niobium and silver oxides.In vitro and in vivo evaluations show that the Nb-5 at.％ Ag alloy also has strong antibacterial activity and good biocompati-bility and osteointegration ability.These results demonstrate great potential of the nanostructured Nb-Ag alloys for dental and orthopedic implants.     

Versatile preparation of fluorescent particles based on polyphosphazenes: from micro- to nanoscale

A series of intrinsically fluorescent hydrophobic and amphiphilic polyphosphazenes with ethyl tryptophan (EtTrp) and poly(N-isopropylacrylamide) (PNIPAAm) or poly(ethylene glycol) (PEG) as hydrophobic and hydrophilic segments, respectively, are synthesized. Depending on polymer composition and preparation procedure, particles with diameters ranging from micro- to nanoscale can be prepared successfully, which might be used as a visible tracer, both in vitro or in vivo, in drug- or gene-delivery systems, as well as in other biomedical studies such as diagnostic medicine and brain research. Most importantly, in combination with the flexible synthesis and versatile modification of polyphosphazene, this method provides a general protocol to engineer a broad range of fluorescent particles with different properties based on diverse polymers.     

一种新型长效花卉肥料的肥效试验

介绍了长效花卉肥料在花卉种植上的效果，对该肥料的配制使用进行了研究和探讨，使之更适合各类花卉的生长需要，促进花卉生产发展。     

发酵温度对梨酒品质的影响

发酵温度会影响梨酒发酵过程中微生物的代谢，进而影响梨酒的香气和质量。本文以库尔勒香梨为原材料，分别在8、13、18及23℃发酵温度下进行梨酒酿造，发酵完成后对梨酒的基本理化指标、色度和褐变度进行测定，采用顶空固相微萃取-气相色谱-质谱联用技术（headspace solid phase micro-extraction gas chromatography mass spectrometry, HS-SPME-GC-MS）进行定性和半定量，研究发酵温度对梨酒品质的影响。结果表明：较低发酵温度ULT组（8℃）和LT组（13℃）梨酒酸度低、褐变度低、亮度高，酒体更澄清透明。梨酒中共鉴定出挥发性物质28种，其中酯类12种，醇类8种，酸类4种，酚类1种，烷类3种。在13℃下生产梨酒的酯类物质含量最高，为3150.30μg/L，特征香气物质辛酸乙酯含量最高，可达1939.45μg/L；同时感官评分最高，为83.7分，为梨酒适宜的发酵温度。综上，在13℃发酵具有改善梨酒品质的潜力。     

陶瓷砂循环工艺在耐磨铸件上的应用

介绍了陶瓷砂、无机粘结剂、专用铸造涂料等造型材料的应用特性和造型单元、再生单元、砂供应单元的布局情况,用生产实例说明:陶瓷砂+无机黏结剂+机械干法的砂再生循环工艺可提高铸造企业固体废弃物(废砂)的循环再利用程度,降低固体废弃物90％以上,改善车间的生产环境,减少环保设备的投入.通过流程设计和生产节拍管理,在提升生产效率...