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Nano-Micro Letters 2024年第1期16卷 106-130页

作者： jun Hu Mitsumasa iwamoto Xiangyu Chen CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083People’s Republic of China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Department of Physical Electronics Tokyo Institute of Technology2‑12‑1 S3‑33 O‑OkayamaMeguro‑KuTokyo 152‑8552Japan

The triboelectric nanogenerator(TENG)can effectively collect energy based on contact electrification(CE)at diverse interfaces,including solid–solid,liquid–solid,liquid–liquid,gas–solid,and gas–*** enables energy harvesting from sources such as water,wind,and *** this review,we provide an overview of the coexistence of electron and ion transfer in the CE *** elucidate the diverse dominant mechanisms observed at different interfaces and emphasize the interconnectedness and complementary nature of interface *** review also offers a comprehensive summary of the factors influencing charge transfer and the advancements in interfacial modification ***,we highlight the wide range of applications stemming from the distinctive characteristics of charge transfer at various ***,this review elucidates the future opportunities and challenges that interface CE may *** anticipate that this review can offer valuable insights for future research on interface CE and facilitate the continued development and industrialization of TENG.

关键词： Contact electrification Interfaces Triboelectric nanogenerators Diversified applications

Therapeutic barium enema for bleeding colonic diverticula:Four case series and review of the literature

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World Journal of Gastroenterology 2008年第41期14卷 6413-6417页

作者： jun-ichi iwamoto Yuji Mizokami Koichi Shimokobe Takeshi Matsuoka Yasushi Matsuzaki Department of Gastroenterology Tokyo Medical University Kasumigaura Hospital Chuo 3-20-1 Ami Inashiki

The prevalence of diverticular diseases of the colon, including severe and persistent bleeding in Eastern countries, has increased in the last decades. The bleeding from colonic diverticula is the most common cause of acute lower gastrointestinal bleeding. Herein, we report four cases of severe and persistent bleeding of colonic diverticular disease that could be treated with a high concentration barium enema. These four cases showed a similar pattern of bleeding whose source could not be identified. Colonoscopy revealed fresh blood in the entire colon and many diverticula were noted throughout the colon. No active bleeding source was identified, but large adherent clots in some diverticula were noted. After endoscopic and angiographic therapies failed, therapeutic barium enema stopped the severe bleeding. These patients remained free of re-bleeding in the follow-up period (range 17-35 mo) after the therapy. We report the four case series of therapeutic barium enema and reviewed the literature pertinent to this procedure.

关键词： Therapeutic barium enema Colonic diverticula Diverticular bleeding

Analysis of stress fractures in athletes based on our clinical experience

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World Journal of Orthopedics 2011年第1期2卷 7-12页

作者： jun iwamoto Yoshihiro Sato Tsuyoshi Takeda Hideo Matsumoto Institute for Integrated Sports Medicine Keio University School of MedicineTokyo 160-8582Japan Department of Neurology Mitate HospitalFukuoka 826-0041Japan

AIM:To analyze stress fractures in athletes based on experience from our sports medicine ***:We investigated the association between stress fractures and age,sex,sports level,sports activity,and skeletal site in athletes seen at our sports medicine clinic between September 1991 and April *** fractures of the pars interarticularis were excluded from this ***:During this period(18 years and 8 mo),14276 patients(9215 males and 5061 females)consulted our clinic because of sports-related injuries,and 263 patients(1.8%)[171 males(1.9%)and 92 females(1.8%)]sustained stress *** average age of the patients with stress fractures was 20.2 years(range 10-46 years);112 patients(42.6%)were 15-19 years of age and 90(34.2%)were 20-24 years of ***,90 patients(34.2%)were active at a high recreational level and 173(65.8%)at a competitive *** highest proportion of stress fractures was seen in basketball athletes(21.3%),followed by baseball(13.7%),track and field(11.4%),rowing(9.5%),soccer(8.4%),aerobics(5.3%),and classical ballet(4.9%).The most common sites of stress fractures in these patients were the tibia(44.1%),followed by the rib(14.1%),metatarsal bone(12.9%),ulnar olecranon(8.7%)and pelvis(8.4%).The sites of the stress fractures varied from sport to *** ulnar olecranon was the most common stress fracture site in baseball players,and the rib was the most common in *** and classical ballet athletes predominantly sustained stress fractures of the tibia and metatarsal *** and field and soccer athletes predominantly sustained stress fractures of the tibia and pubic *** athletes predominantly sustained stress fractures of the *** and long distance female runners who sustained multiple stress fractures had the female athlete ***:The results of this analysis showed that stress fractures were seen in high-level young athletes,with similar proportions for males and females

关键词： Athletes Bone mineral density Female athlete triad Stress fracture Vitamin D insufficiency

Return to sports activity by athletes after treatment of spondylolysis

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World Journal of Orthopedics 2010年第1期1卷 26-30页

AIM:To clarify the efficacy of conservative and surgical treatment of spondylolysis in ***:PubMed was used to perform a search of the literature for studies published during the period from 1990 to 2009 that reported data on the outcome of conservative or surgical treatment of spondylolysis in *** articles were examined for data on the percentage of athletes who returned to sports activities and the interval between the start of treatment and their ***:Five studies were *** studies were concerned with conservative treatment and the other three with surgical treatment(wire fixation or screw fixation with bone graft).The percentages of athletes who returned to sports activities ranged from 80.0%to 89.3%and from 81.9%to 100%,respectively,and the intervals until their return ranged from 5.4 to 5.5 mo and from 7 to 12 mo,***:The percentages of athletes who returned to sports activities after conservative and surgical treatment appeared to be satisfactory,but the

关键词： Spondylolysis Athletes Conservative treatment Surgical treatment Return to play Literature review

Effectiveness of exercise for osteoarthritis of the knee:A review of the literature

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World Journal of Orthopedics 2011年第5期2卷 37-42页

作者： jun iwamoto Yoshihiro Sato Tsuyoshi Takeda Hideo Matsumoto Institute for Integrated Sports Medicine Keio University School of MedicineShinjuku-kuTokyo 160-8582Japan Department of Neurology Mitate HospitalTagawaFukuoka 826-0041Japan

Osteoarthritis(OA)of the knee is the most common type of arthritis and the major cause of chronic musculoskeletal pain and mobility disability in the *** objective of this paper is to discuss the effectiveness of exercise for OA of the knee based on a review of the *** reviewed the relevant literature,*** reviews and meta-analyses searched using *** strengthening and aerobic exercises are effective in reducing pain and improving physical function in patients with mild to moderate OA of the knee.

关键词： Osteoarthritis of the knee Muscle strengthening exercise Quadriceps Hamstrings

Effect of risedronate on speed of sound in postmenopausal women with osteoporosis

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World Journal of Orthopedics 2013年第4期4卷 316-322页

作者： jun iwamoto Tetsuya Takada Yoshihiro Sato Hideo Matsumoto Institute for Integrated Sports Medicine Keio University School of Medicine Department of Internal Medicine Hiyoshi Medical Clinic Department of Neurology Mitate Hospital

AIM: To examine the effects of treatment with risedronate for 1 year on speed of sound(SOS) of the calcaneus and bone turnover markers in postmenopausal women with osteoporosis. METHODS: Thirty-eight postmenopausal women with osteoporosis who had been treated with risedronate for > 1 year were enrolled in the study. The SOS and bone turnover markers were monitored during treatment with risedronate for 1 year. RESULTS: The urinary levels of cross-linked N-terminal telopeptides of type Ⅰ collagen and serum levels of alkaline phosphatase were significantly decreased at 3 mo(-34.7%) and 12 mo(-21.2%), respectively, compared with the baseline values. The SOS increased modestly, but significantly by 0.65% at 12 mo compared with the baseline value. Treatment with risedronate elicited an increase in the SOS of the calcaneus exceeding the coefficient of variation in vivo(0.27%). CONCLUSION: The present study confirmed that risedronate suppressed bone turnover and elicited a clinically significant increase in the SOS of the calcaneus in postmenopausal women with osteoporosis.

关键词： Risedronate Postmenopausal women Quantitative ultrasound Speed of sound Bone turnover

Numerical investigation of non-uniform temperature fields for proppant and fluid phases in supercritical CO_(2)fracturing

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Particuology 2024年第7期90卷 149-163页

作者： Boyu Liu jun Yao Research Center of Multiphase Flow in Porous Media China University of Petroleum(East China)Qingdao 266000China

The non-uniform temperature distribution in supercritical CO_(2)(Sc-CO_(2))fracturing influences the density,viscosity,and volume expansion or shrinkage rate of Sc-CO_(2),impacting proppant *** study presents a coupled computational fluid dynamics-discrete element method and heat transfer model to examine the effects of proppant bed shape and the heat transfers of proppant-wall,proppant-fluid,and fluid-wall on the fluid and proppant temperature *** Sc-CO_(2)volume expansion is assessed under various temperature conditions by evaluating the volume-averaged Sc-CO_(2)*** factors,including proppant size,shape,thermal conductivity,concentration,temperature difference,and injection velocity,are carefully analyzed to elucidate their *** findings elucidate the existence of four distinct zones in the fluid temperature *** zone exhibits different magnitudes of temperature change under diverse conditions and undergoes dynamic transformations with the development of the proppant *** fluid-wall heat transfer and the fluid temperatures in Zones C and D are significantly subject to the fluid injection velocity(governing the heating duration),the temperature difference between fluid and formation(impacting the magnitude of heat flux),and the proppant bed shape(controlling the effective heating area).Additionally,the proppant-wall and proppant-fluid heat transfers determine the temperatures of both the proppant bed and the fluid within Zone B,showing a strong correlation with proppant thermal conductivity,proppant size,injection velocity,and temperature *** proposed coupled model provides valuable insights into the temperature distributions and flow behaviors of temperature-dependent fracturing fluids and proppants.

关键词： CFD-DEM Heat transfer Compressible fluid CO_(2)sequestration Proppant transport

Geometric Error Identification of Gantry-Type CNC Machine Tool Based on Multi-Station Synchronization Laser Tracers

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 150-162页

作者： jun Zha Huijie Zhang School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China Xi’an Jiaotong University Suzhou Academy Suzhou 215123China

Laser tracers are a three-dimensional coordinate measurement system that are widely used in industrial *** propose a geometric error identification method based on multi-station synchronization laser tracers to enable the rapid and high-precision measurement of geometric errors for gantry-type computer numerical control(CNC)machine *** method also improves on the existing measurement efficiency issues in the single-base station measurement method and multi-base station time-sharing measurement *** consider a three-axis gantry-type CNC machine tool,and the geometric error mathematical model is derived and established based on the combination of screw theory and a topological analysis of the machine kinematic *** four-station laser tracers position and measurement points are realized based on the multi-point positioning principle.A self-calibration algorithm is proposed for the coordinate calibration process of a laser tracer using the Levenberg-Marquardt nonlinear least squares method,and the geometric error is solved using Taylor’s first-order linearization *** experimental results show that the geometric error calculated based on this modeling method is comparable to the results from the Etalon laser *** a volume of 800 mm×1000 mm×350 mm,the maximum differences of the linear,angular,and spatial position errors were 2.0μm,2.7μrad,and 12.0μm,respectively,which verifies the accuracy of the proposed *** research proposes a modeling method for the precise measurement of errors in machine tools,and the applied nature of this study also makes it relevant both to researchers and those in the industrial sector.

关键词： Multi-point positioning Multi-station synchronization CNC machine tool Geometric error Error separation

A generalized presentation of multi-caloric effects based on exterior derivative theory and its applications

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Communications in Theoretical Physics 2024年第8期76卷 156-163页

作者： jun Yin School of Materials Science and Engineering Nankai UniversityTianjin 300350China School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350108China

The emerging concept of multi-caloric effects, introduced in 2010, entails the application of multiple interplay fields to a thermodynamic system. While multi-caloric effects are the main focus of experimental endeavors, theoretical considerations fall short of providing a thorough understanding. This paper introduces a comprehensive presentation on multi-caloric effects,employing the method and theory of exterior derivative formations. It addresses every aspect of thermodynamic systems, showcasing its applicability to multi-caloric materials(both singlephase and multi-phase materials), and its adaptability to different scenarios(either in single or multiple force fields). The formulation of Maxwell relationships, characterized by their generality and universality, enables a clear prediction in entropy and temperature, facilitating a distinct identification between independent and interdependent contributions from multi-caloric effects. These insights hold significant importance in designing and developing specialized thermodynamic materials, optimizing functional performances and exploring innovative mechanisms.

关键词： multicaloric effects Maxwell relations isothermal entropy adiabatic temperature

On the Monge–Kantorovich Mass Transfer Problem in Higher Dimensions

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Acta Mathematica Sinica,English Series 2024年第8期40卷 1989-2004页

作者： Xiao jun LU School of Mathematics Southeast UniversityNanjing 210096P.R.China

This paper mainly investigates the approximation of a global maximizer of the Monge–Kantorovich mass transfer problem in higher dimensions through the approach of nonlinear partial differential equations with Dirichlet *** an approximation mechanism,the primal maximization problem can be transformed into a sequence of minimization *** applying the systematic canonical duality theory,one is able to derive a sequence of analytic solutions for the minimization *** the final analysis,the convergence of the sequence to an analytical global maximizer of the primal Monge–Kantorovich problem will be demonstrated.

关键词： Monge-Kantorovich mass transfer singular variational problem canonical duality theory