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Search Results: 1 - 10 of 73591 matches for " CHENG Xin-Feng "
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Comparative studies on life history characteristics of three sibling species in Brachionus calyciflorus species complex
萼花臂尾轮虫(Brachionus calyciflorus)种复合体内三个姐妹种生活史特征比较

LI Hua-Bing,XI Yi-Long,CHENG Xin-Feng,

生态学报 , 2009,
Abstract: 采自芜湖市莲塘湖和荷花塘水体中的萼花臂尾轮虫3个姐妹种HE1、HE3和LE9在13℃、18℃、23℃和28℃下的生命表参数间的差异表现为13℃和18℃下姐妹种LE9的生命期望和平均寿命都显著长于姐妹种HE3,23℃下姐妹种HE1的生命期望和平均寿命均最短;13℃下姐妹种LE9的世代时间显著长于姐妹种HE3,18℃下和23℃姐妹种LE9和HE1的世代时间分别最长和最短;13℃下姐妹种LE9的净生殖率最高,28℃下姐妹种HE1的净生殖率最低;13℃下姐妹种LE9的种群内禀增长率最高,18℃下姐妹种HE3的种群内禀增长率显著高于姐妹种LE9;18℃和28℃下姐妹种HE3所产后代中的混交雌体百分率最高,23℃下姐妹种HE1所产后代中的混交雌体百分率显著低于HE3.3个姐妹种的生命表参数对升高的温度的响应也不相同.温度、姐妹种及两者间的交互作用对轮虫的世代时间、平均寿命、出生时的生命期望和轮虫所产后代中的混交雌体百分率均有显著的影响;温度和姐妹种对轮虫的净生殖率和种群内禀增长率均有极显著影响,但两者的交互作用对其无显著性影响.
Synthesis and thermoelectric properties of thermoelectric materials of the skutterudites In0.3Co4Sb12-xSex
In0.3Co4Sb12-xSex 方钴矿热电材料的制备和热电性能

Wang Zuo-Cheng,Li Han,Su Xian-Li,Tang Xin-Feng,

物理学报 , 2011,
Abstract: 用熔融退火结合放电等离子烧结法制备了In0.3Co4Sb12-xSex(x=0—0.3)方钴矿热电材料,探讨了In的存在形式,系统研究了Se掺杂量对结构和热电性能的影响.结果表明:In可以填充到方钴矿二十面体空洞处,过量In在晶界处形成InSb第二相,Se对Sb的置换使晶格常数减小,In填充上限降低;In0.3Co4Sb12-xSex样品呈n型传导,随着Se掺杂量的增大,载流子浓度降低,电导率下降,Seebeck系数增大,功率因子有所降低;由于在结构中引入了质量波动及晶格畸变,适量的Se掺杂可以大幅降低材料晶格热导率;样品In0.3Co4Sb12和In0.3Co4Sb11.95Se0.05的最大ZT值均达到1.0以上.
The Effect of Crystal Characteristics and Manufacturing Processes on the Mechanical Properties of Composite Explosive

SHU Yuan-jie,WANG Xin-feng,XIE Hui-min,CHENG Ke-mei,HAO Ying,

实验力学 , 2006,
Abstract: The effects of manufacturing processes and storage on the mechanical properties of explosives were rendered through studying the change of TATB,HMX explosives and binder F in PBX(plastic bonded explosive) during molding powder pressing,thermal processing,thermal aging and storage.Some conclusions can be obtained from the results.The crystallity of binder F increases with the aging temperature increasing.But generally,the mechanical properties of TATB-based PBX do not have any serious changes after being aged,which shows that the effect of the change of crystallinity of binder and the particle size on the performances of the explosives is not significant.After many thermal circles,for pillars of PBX based on TATB formed by the steel mould pressing,the mechanical strength of these pillars decreases.It might be caused by the interface dewetting between TATB and binder F.Aging process also makes the mechanical properties worse.Compared with the steel mould pressing,the isostatic pressing technology could significantly improve the mechanical properties of the PBX based on TATB.
Influence of Microstructure on the Electrical Properties of Bi2Sr2Co2Oy Compound
GAO Wen-Bin, ZHANG Li, TANG Xin-Feng
无机材料学报 , 2010, DOI: 10.3724/sp.j.1077.2010.00621
Abstract: Single phase Bi2Sr2Co2Oy compound was synthesized by Sol-Gel method, using PEG20000 and ultrasonic treatment to optimize microstructure of powders, and bulk materials were gained after SPS technique. The influence of microstructure on electrical properties of Bi2Sr2Co2Oy compound was investigated. The results show that adding of PEG20000 and ultrasonic treatment can decrease the size of powders obviously, the grain size of bulk materials decreases greatly, so the electrical properties of material increased. Bulk materials synthesized from the powders prepared with adding PEG20000 and ultrasonic treatment gain the highest ZT value of 0.041 at 873K.
Enhanced Thermoelectric Performance in Na/Se Doped p―type AgSbTe2 Compound
DU Bao-Li, LI Han, TANG Xin-Feng
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.00680
Abstract: Two types of Na―doped and Na/Se co―doped polycrystalline, sintered samples of p―type AgSbTe2 thermo― electric compounds were prepared from high purity elements by a melt―quench technique followed by spark plasma sintering (1: with excess Na or Na/Se, AgNa0.01SbTe2, AgNa0.01SbTe2Se0.04; 2: replacing corresponding elements by Na or Na/Se, Ag0.99Na0.01SbTe2, Ag0.99Na0.01SbTe1.96Se0.04). The impacts of Na―doping, Na/Se co―doping and doping form on electrical and thermal transport properties were investigated. Meanwhile, by comparing the thermoelectric performance of samples with different kinds of doping form, the optimal doping method is obtained. That is Na replacing Ag, Se replacing Te with appropriate amount of excess Se. Due to the elevation of Seebeck coefficient by Na―doping and optimization of electrical and thermal conductivities by Se―doping, a maximum of ZT merit of 1.4 is achieved at 620 K for sample Ag0.99Na0.01SbTe1.96Se0.04, representing a 17% enhancement with respect to the undoped sample at the same temperature.
Synchronizability Optimization for the Edge Iteration Based Deterministic Small-world Network with the Modified Simulated Annealing Algorithm
Xin-Feng Li,Shi-Ze Guo,Yu-Xin Su,Zhe-Ming Lu
Information Technology Journal , 2013,
Abstract: Recently, researchers have presented several deterministic small-world networks (DSWNs) which can be generated in a special iteration process without randomness. However, to the best of our knowledge, no one has studied the synchronizability of DSWNs up to now. In this study, we focus on the synchronizability of the edge iteration based deterministic small world network (EIB-DSWN) that was presented in 2006. Our testing results show that the EIB-DSWN has very poor synchronizability. To improve the synchronizability, we propose using the Modified Simulated Annealing (MSA) algorithm to optimize the EIB-DSWN. After MSA-based optimization, to check if the optimized network is still a kind of small-world network, we calculate its three main characteristics. It turns out that the MSA algorithm can significantly optimize the synchronizability of the EIB-DSWN under the premise of ensuring small world characteristics.
5,6-Dihydro-1,10-phenanthroline-1,10-diium μ-oxido-bis[pentafluoridotantalate(V)]
Zhao-Hui Meng,Yu-Quan Feng,Xin-Feng Chen
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812014742
Abstract: In the title compound, (C12H12N2)[Ta2F10O], the doubly protonated 5,6-dihydro-1,10-phenantroline-1,10-diium cation is located on a twofold rotation axis, whereas the isolated [Ta2OF10]2 dianion has -1 symmetry. In the so far unknown dianion, the symmetry-related TaV atoms are octahedrally coordinated by five F atoms and a bridging O atom, the latter being located on an inversion centre. The two pyridine rings in the cation make a dihedral angle of 22.8 (4)°. The cations and dianions are arranged in layers parallel to (100) and are connected through N—H...F and C—H...F hydrogen-bonding interactions into a three-dimensional structure.
The Protective Effects of α-Lipoic Acid on Kidneys in Type 2 Diabetic Goto-Kakisaki Rats via Reducing Oxidative Stress
Bo Feng,Xin-Feng Yan,Jun-Li Xue,Lei Xu,Hua Wang
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14046746
Abstract: To evaluate the protective effects of α-lipoic acid on the kidneys of Goto-Kakisaki (GK) diabetic rats, ten GK diabetic rats were randomly divided into a diabetic control group and a lipoic acid-treated diabetic group with α-lipoic acid 35 mg·Kg ?1 intraperitoneal injections. Four healthy Wistar rats served as normal controls. Malonaldehyde (MDA), ascorbic acid (vitamin C), vitamin E, glutathione (GSH) and superoxide dismutase (SOD) levels in renal homogenate, and urine protein excretion were measured. The expression of mRNA for NF-κB, NADPH oxidase subunits p22phox and p47phox in renal tissue was examined by realtime PCR. Pathological changes in renal tissue were evaluated by light and electron microscopy. There were significant increases in urine protein excretion, MDA levels and the expression of mRNA of NF-κB, p22phox and p47phox, and significant decreases in GSH, SOD, vitamin C and vitamin E levels in the diabetic control group compared with the normal control group. Pathological changes of renal tissue were more progressive in the diabetic control group than in the normal control group. All the parameters above were improved in the α-lipoic acid-treated diabetic group. Oxidative stress is increased in the kidney of type 2 diabetic GK rats. It is associated with the progression of diabetic nephropathy. α-lipoic acid can protect renal function in diabetic rats via its antioxidant activity.
Solitary adrenal metastasis from invasive ductal breast cancer: an uncommon finding
Xiao-Jiao Liu, Peng Shen, Xin-Feng Wang, Ke Sun, Fei-Fei Sun
World Journal of Surgical Oncology , 2010, DOI: 10.1186/1477-7819-8-7
Abstract: A 64-year-old woman was found a left adrenal mass on a follow- up visit two years after taking a right modified radical mastectomy for the breast cancer. She was subsequently given a left adrenalectomy. Postoperative histopathology findings were compatible with invasive ductal carcinoma (IDC) of the breast. Due to the patient's refusal, no further treatments were offered after the adrenalectomy. The patient now is still alive and has no sign of relapse. Survival time after taking the right modified radical mastectomy and the left adrenalectomy is more than five years and three years, respectively.This is the first case of a patient with solitary, metachronous adrenal metastasis from IDC of the breast to be reported. For patients in this condition, complete removal of metastasized organ may translate into survival benefit.Invasive ductal carcinoma (IDC) is the most common type of the breast cancer, which has been reported to constitute approximately 70-85% of all invasive breast carcinomas[1]. Usually, IDC can metastasize to the lungs, liver, bones and brain, but rarely to the adrenal glands[2,3]. In a study of metastatic patterns of breast cancer, Borst MJ[2] reported that in a group of the 2246 patients with IDC, none of them had shown adrenal metastasis. In fact, adrenal metastasis of breast cancer is generally associated with infiltrating lobular carcinomas (ILC) and often accompanied by synchronous multiorgan metastases[3]. A metachronous, isolated adrenal metastasis from ILC is rare, which is even rarer when it derives from IDC of the breast. So far there has been only one case of isolated adrenal metastasis arising from ILC of the breast documented [4], but the IDC with solitary adrenal metastasis has never been reported in the literature.Due to the rarity of solitary adrenal metastasis from breast cancer, the optimal treatment is still unclear. Generally, distant visceral metastasis is an upset aspect for cancer patient, palliative chemotherapy would be recom
Metal nano-hole array copied from AAO template

Zhao Xin-Feng,Fang Yan,

物理学报 , 2006,
Abstract: Well-aligned and highly ordered nano-hole array copper membranes were copied from anodic aluminum oxide (AAO) template by vacuum plating. SEM shows that the nanoholes of copper membranes are hexagonally arranged with high regularity consistent with that of AAO template. The mean diameter of the holes was dependent on the corresponding parameter of AAO template. Compared with AAO membranes, the nano-hole array metal ones have many advantages in better chemical and thermal stability and higher mechanical strength, and are likely to play an important role in nano-copy field.
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