Effect of Rare Earth on Microstructure of Vacuum Melting Ni-Based Self-Fluxing Alloy Coatings

The Ni-based self-fluxing alloy coating containing RE was acquired by the technique of vacuum melting on the hypoeutectoid steel (Fe-0.45%C) matrix. By X-ray diffraction, SEM and EDX, the microstructure and phase structure of section of coating and the microstructure near the interface between coating and matrix were investigated, and the effect of RE on microstructure of coating was also discussed. The results show that the microstructure of the NiCrBSi alloy coating is composed of Ni-based solid solution and a lot of massive, globular and needle secondary phases CrB, Ni_3B, Cr_7C_3, Cr_(23)C_6 among the solid solution. The metallurgical binding between steel matrix and coating is realized. RE makes needle phase of alloy coating vanish. New phases of NiB and Cr_(6.5)Ni_(2.5)Si are precipitated from alloy coating, and secondary phases of alloy coating are sphericized. Consequently, RE also hinders the diffusion of Ni, Cr and Si atoms from coating to matrix and Fe atoms from matrix to coating, holds back the dilution of Fe for NiCrBSi alloy coating, and assures the chemical composition of the alloy coating.

Research progress of laser cladding self-fluxing alloy coatings on titanium alloys

Laser cladding is a new surface modification technology, and is widely used for fabricating wear and corrosion resistant composites coatings. Self-fluxing alloys have many advantages, such as excellent properties of deoxidizing and slagging, high wear resistance, low melting point and easy cladding, and are often used in laser cladding to improve wear and corrosion resistance of titanium and its alloys. In this paper, the recent development of Ni-based and Co-based self-fluxing alloy coatings which includes the influenee of rare earth and ceramic particles in coatings are summarized. Besides, the effects of processing parameters, such as laser power and scanning speed, on coatings are reviewed. Finally, the trend of development in the future is forecasted.

Microstructure,properties and first principles calculation of titanium alloy/steel by Nd: YAG laser self-fluxing welding

The experiment of Nd： YAG pulsed laser self-fluxing welding for 304 stainless steel/Ti6Al4V titanium alloy dissimilar metal was carried out. The microstructure properties of welded joint were analyzed by SEM, EDS and XRD. The equilibrium lattice constants, enthalpies of formation, cohesive energies, mechanical properties, Debye temperatures and valence electron structures of Ti-Fe intermetallic compounds （IMCs） were calculated by the first principle pseudopotential plane wave method based on density functional theory （DFT）. According to the thermodynamic data of Ti-Fe-Cr compounds, the Gibbs free energy per mole of compound at different temperatures was calculated and their thermal stability was compared. The results show that there are no macroscopic cracks in the welded joints, and the IMCs distributed evenly along the welding interface exhibits 3 distinct layers of microstructure with different colors. The welds interface generates IMCs of TiFe, TiFe 2 and a small amount of Ti 5Cr 7Fe 17 IMCs. Ti-Fe IMCs with high thermodynamic stability and easy alloying formation. The results of Gibbs free energies show that the sequence of precipitates in the interface is Ti 5Cr 7Fe 17 , TiFe 2 and TiFe in high temperature during the metallurgical reaction. The G/B values of Ti-Fe IMCs are greater than the critical value of 0.5, indicating that it is an intrinsic brittleness.

Microstructure of Ni-Based Self-Fluxing Alloy Sprayed Coating

The microstructure of a Ni-based self-fluxing alloy coating produced by an oxygen-acetylene flame spraying Ni-16.5Cr-3.3B-4.7Si-4.4Fe-0.8C system alloy powder onto a common steel substrate was investigated by microanalysis methods.The phases in the coating were observed by SEM and determined by XEDS X-Ray energy spectrum and X-Ray diffraction patterns.Meanwhile,some molecular formulas were calculated.

Hydrogen generation from coupling reactions of AlLi/NaBH_4 mixture in water activated by Ni powder

A novel composition of AlLi/NaBH4 mixture activated by common Ni powder in water for hydrogen generation was investigated. The composition presents good hydrogen generation performance and an optimized Al-10% Li-10% Ni/NaBH4 mixture （mass ratio of 3：1） generates 1540 mL/g hydrogen with 96% efficiency at 333 K. Ni powder exhibits dual catalytic effects on the hydrolysis of AlLi/NaBH4 mixture due to the formation of Ni2B in the hydrolysis process. The Ni2B deposited on aluminum surface could act as a cathode of a micro galvanic couple. Ni2B/Al（OH）3 also has a synergistic effect on NaBH4 hydrolysis. Good hydrogen generation performance with stable pH value of hydrolysis byproduct Al（OH）3/NaBO2-2H2O was obtained with successive additions of Al-Li-Ni /NaBH4 mixture into fixed water.

ALLIED FUZZY c-MEANS CLUSTERING MODEL

A novel model of fuzzy clustering, i.e. an allied fuzzy c means （AFCM） model is proposed based on the combination of advantages of fuzzy c means （FCM） and possibilistic c means （PCM） clustering. PCM is sensitive to initializations and often generates coincident clusters. AFCM overcomes this shortcoming and it is an ex tension of PCM. Membership and typicality values can be simultaneously produced in AFCM. Experimental re- suits show that noise data can be well processed, coincident clusters are avoided and clustering accuracy is better.

定向凝固时热溶质对流对Al/AlLi共晶生长形态稳定性的影响

在垂直向上定向凝固条件下 ,研究了热溶质对流对二元亚共晶 Al-Li合金 Al/ Al Li共晶生长形态稳定性的影响。结果表明 ,晶体生长初期 ,热溶质对流较微弱 ,对界面形态稳定性无明显的影响 ,晶体以完全的Al/ Al Li共晶方式生长。当热溶质对流较强烈时 ,对界面形态稳定性产生严重的影响。平面界面失稳破开时 ,单相胞状晶领先生长。在单相胞状晶之间以 Al/ Al Li共晶方式生长。获得了二元亚共晶

AlLi相对Mg−Li合金热压缩变形行为和动态再结晶的影响

采用等温热压缩实验研究含有AlLi相的Mg−5Li−3Al−2Zn(LAZ532)合金的热变形行为;变形温度和应变速率范围分别为473~623 K和0.001~1 s^(−1)。LAZ532合金热变形过程中AlLi相能够阻碍位错运动,从而显著提高合金的峰值应力值。为精确预测LAZ532合金的热变形行为,构建相应的应变补偿Arrhenius本构模型,预测结果与实验结果吻合良好。基于Murty准则,建立相应的热加工图,合理的加工区域在538~623 K和0.001~0.01 s^(−1)范围内。在高应变速率变形条件下,AlLi相不利于LAZ532合金在热压缩过程中的流动稳定性和动态再结晶。此外,变形温度会改变LAZ532合金的动态再结晶形核机制。

Fabrication and Electrical Properties of Titanium Oxide by Thermally Oxidizing Titanium on Silicon

Polycrystalline titanium oxide films are fabricated on silicon by thermally oxidizing titanium.The current- voltage and capacitance- voltage characteristics of the Ag/Ti Ox/Si/Ag capacitors are m easured.The thickness of the titanium oxide films arranges from15 0 nm to2 5 0 nm,and their dielectric constants are within40～ 87.As the oxida- tion tim e is shortened,the fixed charges of the titanium oxide films become less and the leakage current characteris- tics becom e better.

VUV Photoionization Study of the Allyl Radical from Premixed Gasoline/Oxygen Flame

The allyl radical has been observed in a low-pressure premixed gasoline/oxygen/argon flame by using tunable vacuum ultraviolet photoionization mass spectrometry, The ionization potential of the allyl radical is derived to be （8.13 ±0.02） eV from photoionization efficiency curve, In addition, a high level ab initzo Gaussian-3 （G3） method was used to calculate the energies of tile radical and its cation. The calculated adiabatic ionization potential is 8.18 eV, which is in excellent agreement with the experimental value. The result is helpful for identifying the allyl radical formed from other flames and for understanding the mechanism of soot formation.

ALLIS型直线振动筛主梁断裂的修补实践

根据工作实践 ,分析了ALLIS直线振动筛主梁断裂的原因和前兆特征 ,提出了断面修补、局部补强及主、次梁间的连接方式 ,并重点指出了预防主梁断裂应采取的各种有效措施。

Reducing Paediatric Outpatient Waitlists—A Proposed Allied Health Multidisciplinary Approach

Extremely long Australian paediatric outpatient waiting lists have resulted in large numbers of children waiting to see a paediatrician. Analyses of the patient referrals suggest that a large proportion of children may benefit from allied health input, in addition to being seen by the paediatrician. This paper provides an organisational strategy that involves streamlining Allied Health clinical services in an effort to assist with bringing down a Paediatric Out-patient waitlist. The paper describes principles to guide the formation of a Paediatric Allied Health Multi-Disciplinary team that proposes assessment and brief interventions. The service would focus on supporting the paediatricians through the use of structured procedures, telephone intakes, multidisciplinary triage, shared and standardised assessments, collaborative formulations and reports, brief interventions, clinical-community linkages, and allied health student support. A variety of additional important organisational principles are proposed to facilitate patient flow from the perspective of streamlining administrative processes, having adequate administrative support, shared responsibilities, teamwork, flexibility, carrying out intake assessments, determining which referrals were appropriate for allied health, and working closely with medical staff.

Adult patients with allied disorders of Hirschsprung’s disease in emergency department:An 11-year retrospective study

BACKGROUND In the past years,only a few studies with a limited number of adult patients analyzed clinical features of allied disorders of Hirschsprung’s disease(ADHD),most of which were individual case reports or lacked detailed clinical information.Although many studies have reported patients presenting to the emergency department(ED)with recurrent abdominal symptoms for a number of disorders,there are few data involving ADHD.However,owing to a lack of awareness of the disease,misdiagnoses and mistreatments are common.Severe complications such as perforation,bleeding,malabsorption,and even death in ADHD had been reported by many studies.AIM To assist ED clinicians in having a more comprehensive understanding of this disease and making an early suspected diagnosis of ADHD more effectively.METHODS We enrolled 53 patients who visited the ED and were eventually diagnosed with ADHD over the past 11 years in our hospital.Their basic information,clinical manifestations,and imaging findings were analyzed.Blood indices were compared between the ADHD and irritable bowel syndrome(IBS)groups.RESULTS Adult patients with ADHD had a mean age of 48.8±14.3 years,and 77.4%had been treated before admission.The transverse colon was the most common dilated part(73.6%),and constipation(67.9%)was the most common symptom.ADHD patients can present with uncommon symptoms and false-negative imaging findings.Logistic regression analysis indicated that body mass index(BMI)[odds ratio(OR)=0.786,P=0.013],cholinesterase(per 1000 units;OR=0.693,P=0.008),and blood chlorine(OR=0.816,P=0.022)were determined to be independent related factors between the ADHD and IBS groups.The area under the receiver operating characteristics curve of these three indices combined was 0.812(P<0.001).CONCLUSION Emergency physicians should be vigilant regarding patients with chronic constipation,abdominal pain,or abdominal distension,and consider the possibility of ADHD despite its rarity.Abdominal computed tomography examination is recommended as a useful tool in the suspected diagnosis of ADHD.BMI,cholinesterase,and blood chlorine have good discriminative abilities between ADHD and IBS.The nutritional status of adult patients with ADHD is worthy of further attention.Surgical treatment for adult patients with ADHD is important and inevitable.

Allied Signal Inc.Cooperating with China's Auto Industry

The Beijing American Allied Signal Inc. Auto Division announced in Beijing in June that it will invest about US$100 million in expanding cooperation with China’s auto industry. Allied Signal Inc. is a leading manufacturer providing worldwide service in aero-space, auto, chemicals,

Explore Business Opportunities of Jaboticaba and Build A Long Term Enterprise一Exclusive Interview with Ally Biz International Group CEO John Soo

'Acompany shall have its commitment to build a century-old business if it hopes to continue operation for a long time.'John Soo is the third generation of Chinese immigrants in Malaysia and CEO of Ally Biz International Group. His forefathers were engaged in traditional plantation business. As a new-generation Malaysian Chinese who have received higher education and worked in many international companies as accountant or CEO, John Soo found that the business opportunities in traditional plantation industry has becoming slim. The challenge is to seek a better business project for new breakthroughs.

Three Pillars in the Biden Administration’s China Strategy:Allies,Values,and High-Tech

The Biden Administration has inherited its predecessor’s strategic perception about the growing competition among great powers.As a result,its policy toward China has been largely an extension of its predecessor’s,retaining the elements of competition and revising the instruments to outcompete China.The Biden Administration’s China policy has revolved around three pillars-allies,values,and high-tech,which it believes are America’s strengths in its relations with China.Since Biden took office,the United States has spent most of its diplomatic resources consolidating and building smaller security,economic,and tech alliances with membership restricted to democratic allies only,in an attempt to delink from China and consolidate its hegemonic status in the world.This policy carries the pernicious effect of plunging the world into Cold War-like confrontations.

Pride of National Industry——Shanghai Household Cosmetics Allied Corporation

The Shanghai Household CosmeticsAllied Corporation was establishedin 1898. It is the earliest national cosmeticsenterprise in China. From the GuangSheng Hang(an old firm)in Qing dynastyto a group corporation with modern scaleoperation today, almost a century haselapsed from beginning to end. Thedevelopment of the Shanghai HouseholdCosmetics Corporation bears witness tothe national cosmetics industry’s growthfrom small to large, and from weak tostrong. After entering the 1980s, theShanghai Household CosmeticsCorporation has made considerableprogress, especially in recent years, underthe guidance of the operating strategy

改良Allis法及Stimson法治疗髋关节后脱位17例

目的探讨改良Allis法及Stimson法治疗髋关节后脱位。方法对我院1996年5月至2007年5月治疗的17例髋关节后脱位患者进行研究。结果8例采用第一种复位法,9例采用第二种复位法,均成功复位。结论改良Allis法及Stimson法治疗髋关节后脱位效果满意,值得推广。

The Boundary Between Gondwana and Pacifica and the Suturing Ages of Their Allied Terranes in Southwestern China

Two terranes formed since the Late Palaeozoic can be distinguished in southwestern China. One is charac-terized by the Permo-Carboniferous ice-rafted marine gravel-bearing clastic formation and the cold-water faunaof the Gondwana facies, including the Gangmar Co, Lhasa, Sa' gya, Tengchong and Baoshan terranes and theother is marked by the Upper Palaeozoic of the Yangtze type with the Cathaysian flora and the Pacific-typefusulinids, comprising the Changning-Menglian, Shuangjiang-Lancang, Qamdo and Bayan Har terranes. TheLongmu Co-Shuanghu-Dengqen-North Lancang River-Kejie-Mengding suture zone between the two groups ofterranes is the boundary between Gondwana and Pacifica in southwestern China. On the grounds of thesedimentary formation and successive southwestward migration of the Asian nonmarine Jurassic-Cretaceousendemic bivalves, the ages of the suture and some terranes to the southwest of the suture zone are discussed.The Baoshan terrane and the Nyainrong-Sog terrane in the Lhasa composite terrane were firstly pieced togeth-er with the Asian continent in the early Early Jurassic. The northern Tibet-western Yunnan microplate, in-cluding the Gangmar Co, Lhasa and Tengchong terranes, collided with the Asian continent at the end of theEarly Cretaceous Neocomian.

回顾表观遗传学和染色质生物学开拓者C.David Allis传奇的一生

表观遗传学开拓者、染色质生物学先驱查尔斯•戴维•阿利斯(C.David Allis)的猝然离世,立即引发生物医学界广泛而深远的悼念。借助一系列简介、采访、悼文以及相关原始文献,文章系统地回顾了C.David Allis传奇的一生,梳理了C.David Allis影响深远的贡献。其中包含4项原创研究贡献:发现第一个组蛋白乙酰基转移酶;揭示组蛋白H3第10位丝氨酸磷酸化(H3S10ph)与细胞分裂的关系;参与发现第一个组蛋白位点特异性的甲基转移酶;推动组蛋白变体和“致癌组蛋白(oncohistone)”领域的进展。一项理论贡献:提出“组蛋白密码(histone code)”的假说。两项对表观遗传学界的贡献:作为发起人之一,参与对组蛋白修饰酶的系统命名;作为主编之一,编撰Epigenetics专著。