bluuebunny/crossref_metadata_2025 huggingface dataset:
Asymptotic modeling of the elastodynamics of a multi-structure
Authors: Raoult Annie
Published: November 2019

We consider a structure consisting of two parts: a three-dimensional linearly elastic body and a linearly elastic plate. The plate is inserted into the three-dimensional body. We perform an asymptotic analysis of the time-dependent behavior of the structure during the time-interval [0,T] when the thickness of the plate goes to zero. Under specific assumptions on the data (Lame constants, mass densities, loads), we establish the existence of a limit problem. This limit problem is a system of coupled partial differential equations posed over a three-dimensional body with a slit and the middle surface of the plate. Strong convergence in L2(0,T;H1) of the time-dependent displacements (with appropriate scaling) is proved.
Exact low frequency analysis for a class of exterior boundary value problems for the reduced wave equation in higher dimensions
Authors: Weck N. , Witsch K.J.
Published: November 2019

The order of convergence for the low frequency asymptotics of general exterior problems for the Helmholtz equation with variable, possibly nonsmooth coefficients in dimensions greater than two is shown to be ω2, the square of the frequency, except of some singular cases. In these cases the asymptotics are characterized completely by some lower order terms in the spherical harmonics expansion of the solution to the static problem.
On the de Haas – van Alphen effect
Authors: Guillemin V. , Uribe A.
Published: November 2019

We give a new proof of Landau's theorem on the existence of magnetic oscillations in crystals at low temperatures. Our proof is based on the semi-classical trace formula of Paul and Uribe (1991).
On the asymptotic behaviour of certain Riccati matrix differential equations
Authors: Märker Fritz Jürgen
Published: November 2019

Riccati matrix differential equations of a specific form correspond to self-adjoint differential equations of Sturm–Liouville type (containing an eigenvalue parameter). We derive the asymptotic behaviour of solutions of such a Riccati equation as the parameter tends to minus infinity. Such results can be used e.g. to handle certain problems in optimal control theory.
Multisummability of iterated integrals
Authors: Balser W. , Tovbis A.
Published: November 2019

Multisummability is a technique of assigning a sum to certain formal power series with zero radius of convergence. In this paper, those functions that occur as such sums are characterized. Furthermore, this result is applied in proving multisummability of iterated integrals; these are integrals which frequently occur, e.g., in proofs of the basic Asymptotic Existence Theorem for linear and nonlinear meromorphic differential equations.
Uniform estimates and a blow-up sequence for −Δu=V(x)up
Authors: Wang Shixiao
Published: November 2019

We study the behaviour of the solutions of a nonlinear elliptic equation. We show when there exists a uniform estimate for a sequence of solutions of this equation and when there does not exist such an estimate; in this case we provide a blow-up example.
Korn's inequalities for frame type structures and junctions with sharp estimates for the constants
Authors: Cioranescu Doina , Oleinik O. A. , Tronel Gerard
Published: November 2019

In paper [1] Korn's inequalities are obtained for frame type structures and junctions. For such kind of domains, depending on several parameters, the constants in Korn's inequalities are given in a form which points out their dependence on these parameters and on the geometry of the domain. We improve here these estimates, we give the full proofs of them and show that the constants we obtain are asymptotically sharp. We also correct some misprints from paper [1].
Asymptotic expansions and stationary phase for operators with discontinuous symbol
Authors: Widom Harold
Published: November 2019

We consider the problem of the asymptotics of tr f(Tα) where f is a “general” function, Tα, the pseudodifferential operator with symbol σ(x,ξ,α). Here α is a large parameter, and σ is a rapidly decreasing function. If σ smooth, techniques which are by now standard yield complete asymptotic expansions, with computable coefficients, as α→∞. Here we consider also cases where σ is not smooth; it may jump across a hypersurface in x-space or a hyperplane in x, ξ-space. We prove the existence of complete asymptotic expansions and show how to compute the coefficients for polynomial f. Of central importance is the analytic continuations of certain distributions acting on spaces of non-smooth test functions.
Asymptotically correct lower bound for the sum of negative eigenvalues of Schrödinger operators through a decomposition of unity given by Macke
Authors: Siedentop Heinz , Weikard Rudi
Published: November 2019

We prove that the semi-classical expression for the sum of the negative eigenvalues of a one-dimensional Schrödinger operator with negative potential −φ is correct up to order O(h log 1/h) in the “Planck” constant h provided φ1/4 is in the Sobolev space H1(R).
Exponential decay of the energy of a nonlinear system of Klein–Gordon equations with localized dampings in bounded and unbounded domains
Authors: da Silva Ferreira José
Published: November 2019

We study the exponential decay of the energy of the nonlinear system of Klein–Gordon equations utt−Δu+m1u+f(u,v)+a(x)ut=0, vtt−Δv+m2v+g(u,v)+b(x)vt=0,(x,t)∈O×(0,∞),u=v=0 on Γ0×(0,∞), where O is abounded or unbounded domain in RN with smooth boundary ro Γ0:=∂O;a,b∈L∞+O,a,b≥constant>0, a.e. in some appropriated open subset of O, and f, g satisfy some suitable conditions. The exponential decay of the energy is established by adapting to the system multiplier techniques of J.L. Lions, some techniques developed by E. Zuazua for a single equation and a unique continuation principle of A. Ruiz.
Asymptotic behaviour for an equation of superslow diffusion in a bounded domain
Authors: Galaktionov Victor A. , Kersner Róbert , Vazquez Juan L.
Published: November 2019

We study the large-time behaviour of the solution to the mixed problem: ut=Δ(e−1/u) in Q=Ω×(0,∞), with u(x, t) = 0 for x∈∂Ω, t≥0 and u(x,0)∈L∞(Ω), u(x,0)≥0. Ω is a bounded domain with smooth boundary ∂Ω. We show that there exists a function F(x) > 0 in Ω such that as t→∞

t(log t)2e−1/u→F(x)

uniformly in x∈Ω. The function F is uniquely determined as the solution of the problem: ΔF=−1 in Ω, F=0 on ∂Ω.
Singular perturbation problems with a compact support semilinear term
Authors: Alberti Giovanni , Ambrosio Luigi , Buttazzo Giuseppe
Published: November 2019

In this paper we study the asymptotic behaviour of the functionals

Fε(u)=∫Ω[ε|∇u|2+ε−3β(u/ε)]dx

where β is a non-negative lower semicontinuous function with compact support. When ε tends to 0, the limit functional corresponds to a least area problem with an obstacle.
Variational algorithms for the Helmholtz equation using time evolution and artificial boundaries
Authors: Bardos Claude , Rauch Jeffrey
Published: November 2019

This paper is devoted to the mathematical analysis of some algorithms for the computation of the outgoing solution of the Helmholtz equation in an exterior domain. In a first approximation an artificial boundary with absorbing boundary condition is inserted. One then computes the periodic response in this bounded dissipative setting to a periodic forcing term. The response is characterized as the unique minimum of a convex functional. The functional is computed from solution of the time dependent problem in the artificially bounded domain. One such algorithm is due to Glowinski who proposed the functional J2 described below, it has been implemented by Bristeau et al. [5]. We propose a different functional J1 which is unconditionally coercive while the coerciveness of J2 depends in a subtle way on the geometry of the domain. It is coercive for non-trapping obstacles. The coerciveness property is essential for the convergence of the numerical method.
Singular perturbations in the linear filtering with small observation noise
Authors: Marchetti Charles
Published: November 2019

We consider the linear filtering problem with a small observation noise. We approximate the signal and its estimation with asymptotic expansions (see [6] and [7]).
Asymptotic representation of elastic fields in a multi-structure
Authors: Kozlov V.A. , Maz'ya V.G. , Movchan A.B.
Published: November 2019

A mixed boundary value problem is posed for the Lame system in an elastic multi-structure which consists of a union of a three-dimensional domain and thin cylinders. A normalized thickness of a rod is characterized by a small parameter ε. We present a rigorous algorithm which yields a multi-scaled asymptotic expansion for the displacement and stress fields in the multi-structure. Justification of the asymptotic algorithm, including the remainder estimate for the asymptotic approximation of the displacement field, is given.

The asymptotic analysis provides the range of applicability of the engineering pile structure model.

It is shown that first three eigenvalues of the spectral problem in the above multi-structure have the order O(ε4). The asymptotic formulae for these eigenvalues are obtained.
Exact controllability and asymptotic limit for thin plates
Authors: Figueiredo Isabel , Zuazua Enrique
Published: November 2019

We consider the exact controllability problem for a three-dimensional linear elastic thin plate, with thickness 2ε and a polygonal middle surface. Controls are imposed on the lateral surface and at the top and bottom of the plate. The asymptotic limit when ε→0 is computed. We obtain that the displacements converge to a controlled Kirchhoff–Love displacement, where the normal displacement satisfies the usual two-dimensional evolution equation for a linear plate, with controls on the boundary and in the interior of the plate.
Asymptotic behaviour of numerical solutions of an evolution equation with memory
Authors: McLean W. , Thomée V.
Published: November 2019

We study the exponential decay of discrete and continuous solutions of a Volterra type integro-differential equation, in which the integral operator is a convolution of an exponentially decreasing scalar positive definite kernel and a positive definite operator, such as an elliptic differential operator. The equation is discretized in time by the backward Euler method in combination with convolution quadrature.
Study of the boundary conditions describing the contact with a well-stirred fluid
Authors: Berrone Lucio R. , Mannucci Paola
Published: November 2019

We study the asymptotic behaviour of the diffraction problem in the one-dimensional case when the conductivity of one of the two media goes to infinity. By means of heat potentials and Laplace transforms we deduce that the temperature of the good conductor (well-stirred fluid) is spatially constant and we find the related contact conditions between the two media involving time derivatives.
Regularity and integrability of 3D Euler and Navier–Stokes equations for rotating fluids
Authors: Babin A. , Mahalov A. , Nicolaenko B.
Published: November 2019

We consider 3D Euler and Navier–Stokes equations describing dynamics of uniformly rotating fluids. Periodic (as well as zero vertical flux) boundary conditions are imposed, the ratios of domain periods are assumed to be generic (non-resonant). We show that solutions of 3D Euler/Navier–Stokes equations can be decomposed as U(t,x1,x2,x3)=Ũ(t,x1,x2) +V(t,x1,x2,x3)+r, where Ũ is a solution of the 2D Euler/Navier–Stokes system with vertically averaged initial data (axis of rotation is taken along the vertical e3). The vector field V(t,x1,x2,x3) is exactly solved in terms of the phases Ωt, τ1(t) and τ2(t). The phases τ1(t) and τ2(t) explicitly expressed in terms of vertically averaged vertical vorticity curl Ū(t)·e3 and velocity Ū3(t). The remainder r is uniformly estimated from above by a majorant of order a3/Ω, a3 is the vertical aspect ratio (shallowness) and Ω is non-dimensional rotation parameter based on horizontal scales. The resolution of resonances and a non-standard small divisor problem for 3D rotating Euler are the basis for error estimates. Contribution of 3-wave resonances is estimated in terms of the measure of almost resonant aspect ratios.

Global solvability of the limit equations and estimates of the error r are used to prove existence on a long time interval T* of regular solutions to 3D Euler equations (T*→+∞, as 1/Ω→0); and existence on infinite time interval of regular solutions to 3D Navier–Stokes equations with smooth arbitrary initial data in the case of small 1/Ω.
Some results in homogenization tackling memory effects
Authors: Alexandre Radjesvarane
Published: November 2019

We give some results on homogenization of transport equations involving transverse and time-dependent oscillating coefficients. For this purpose, we adapt the results of Tartar, which enable to deduce the effective equations. These latter involve memory kernels, as expected, which are described in terms of pseudodifferential operators. Other types of partial differential equations are also dealt with here, which all involve first-order time derivatives.
ANALISA STRATEGI BERSAING PT. GARUDA INDONESIA TBK. (PERSERO)
Authors: Lesmana Rosa , Susanti Novia
Published: November 2019

ABSTRAKTujuan dari penelitian ini adalah untuk mengetahui strategi bersaing dan daya saing PT. Garuda Indonesia Tbk. (Persero) saat ini dan masa akan datang. Penelitian ini menggunakan metode kualitatif. Data dikumpulkan melalui observasi, dokumentasi dan wawancara kepada pihak PT. Garuda Indonesia Tbk. (Persero) maupun kepada konsumen. Analisis SWOT dengan analisa matrik internal dan eksternal digunakan dalam penelitian ini. Hasil penelitian secara internal menunjukkan  bahwa PT. Garuda Indonesia Tbk. (Persero) memiliki Kekuatan utama dan seccara Eksternal memiliki Peluang yang besar. Sedangkan posisi perusahaan berada pada Startegi Pertumbuhan dengan Diversifikasi (sel 1). Dimana strategi yang dapat dilakukan adalah dengan cara menambah jumlah penerbangan, rute, armada dan mengembangkan bisnis baru baik yang terkait dengan bisnis penerbangan maupun tidak terkait bisnis penerbangan.  guna meminimalisir kelemahan PT. Garuda Indonesia Tbk. (Persero). Sehingga PT. Garuda Indonesia Tbk. (Persero) tetap akan menunjukkan keunggulan kompetitifnya.Kata Kunci : Analisis SWOT,  Strategi Bersaing
STRATEGI BERSAING DALAM RANGKA MENGHADAPI MEA (Studi Kasus Rs. Bhakti Asih Karang Tengah -Tangerang)
Authors: Wiyanto Wiyanto , Soekarjono Edi , Hasmanto Boedi
Published: November 2019

ABSTRAKTujuan penelitian ini adalah untuk mengetahui strategi bersaing dan daya saing Rumah Sakit Bhakti Asih untuk memenangkan persaingan saat ini dan mendatang. Penelitian studi kasus dengan metode kualitatif. Data dikumpulkan melalui observasi, dokumentasi dan wawancara kepada pihak Rumah Sakit maupun kepada pasien yang membayar tunai maupun menggunakan fasilitas BPJS. SWOT digunakan dalam analisis penelitian ini. Hasil penelitian menunjukkan  bahwa pentingnya peningkatan skill, smart SDM seluruh jajaran Rumah Sakit, pemberian kompensasi, sarana dan prasarana yang layak mengakibatkan meningkatnya loyalitas karyawandan loyalitas pengguna layanan (pasien) untuk berobat di rumah sakit Bhakti Asih. Berdasarkan matrik Space, Rumah Sakit Bhakti Asih ada pada posisi kuadran I dengan kriteria agresif dan strategi yang dijalankan ditekankan pada penggunaan strategi kekuatan-peluang (strength-opportunities). Penggunaan strategi Strenght –opportunites secara bersamaan akan meminimalisir kelemahan dan ancaman yang dihadapi RS. Bhakti Asih. Sehingga RS. Bhakti asih tetap akan menunjukkan keunggulan kompetitifnya. Kata Kunci : Analisis SWOT,  Harga, Pelayanan, Prasarana, Strategi Bersaing
STRATEGI BAURAN PEMASARAN INTERNET DI PT. INDO INTERNET JAKARTA UNTUK MENINGKATKAN PANGSA PASAR
Authors: Sulaiman Sulaiman
Published: November 2019

ABSTRAKJasa internet merupakan bisnis yang sangat popular dalam bidang teknologi komunikai dan informasi melalui media elektronik (komputer, gadget, telepon gegam, dll.) yang akhir-akhir ini semakin pesat perkembangannya. Jumlah pelanggan internet di seluruh Indonesia pada tahun 2016 diperkirakan sebanyak 63,6 juta dari total penduduk 256,2 juta orang. Potensi pasar jaringan internet berkembang cukup pesat seiring dengan besarnya angka pengguna komputer, gadged dan telepon gegam. Landasan teori dalam studi ini menggunakan beberapa teori umum tentang manajemen pemasaran dan teori tentang strategi bauran pemasaran khususnya yang ada kaitannya dengan bisnis internet. Studi ini lebih bersifat kasus yang menggunakan data kualitatif dan kuantitatif. Analisis data menggunakan metode deskriptif analisis Strenghts, Weaknesses, Opportunities dan Threats (SWOT) serta matriks General Electric, dan metode statistik dengan teknik Persamaan Regresi Berganda, yaitu Y = f (X1, X2) dengan merumuskan hipotesa nihil (Ho) dan hipotesa alternative (Ha). Hasil studi ini menunjukkan bahwa biaya promosi dan biaya subnet/local access link corporate mempunyai pengaruh yang signifikan (90%) terhadap total penjualan PT. Indo Internet. Sedangkan faktor lain yang berpengaruh terhadap penjualan sebesar 10%. Perusahaan berada pada posisi yang menguntungkan dan dalam taraf pertumbuhan. Implikasi strategi pemasaran yang telah diterapkan oleh PT. Indo Internet sudah cukup baik, namun masih perlu dikembangkan khususnya dalam strategi distribusi (subnet), strategi promosi (iklan) dan loyalty program serta strategi pengembangan produk, sehingga pangsa pasar dapat ditingkatkan.Kata kunci: Strategi Pemasaran, Analisis SWOT, Matriik Geneneral Electric, PT. Indo Internet
GEOMATICS ACCURACY AND PRECISION OF DETERMINATION HORIZONTAL DISTANCES IN STAKE OUT MEASUREMENT USING THEODOLITE
Authors: Sulistyo Totok , Achmad Karmila , Giarto Rahmad Bangun
Published: November 2019

Stake-Out is a processes of transferring construction design to the real world so that Stake Out is highly imperative in a construction job. Stake-Out jobs in the middle and lower levels of construction industry are still using theodolite accompanying with calculator rather than using high-end instruments. The results of the study show that theodolite has lower accuracy compared to Total Station and other high-end instruments, such as GPS Geodetic and Laser Scanner. This research is aimed to determine the accuracy and precision of Theodolite in determining the horizontal distance of Stake Out measurement which staff reading is simulated using android App (Stake Out Guide). The results of experiment showed that the accuracy of Theodolite is 0.025 m meanwhile the precision is 0.12%.
STUDI PERENCANAAN PENINGKATAN JARINGAN IRIGASI PADA DAERAH IRIGASI KODI DI KABUPATEN SUMBA BARAT DAYA
Authors: Kase Melchior , Loden Onisius , Mauta Matelda Ch. , Bria Theresia A.
Published: November 2019

Irigasi merupakan kegiatan-kegiatan yang berhubungan dengan usaha mendapatkan air untuk mengairi sawah, ladang, perkebunan, yang sebagai intinya adalah untuk keperluan pertanian dalam usaha tani. Daerah Irigasi Kodi yang secara administratif berada di Desa Watu Wona, Kecamatan Kodi, Kabupaten Sumba Barat Daya, Propinsi Nusa Tenggara Timur. Sumber air Daerah Irigasi ini berasal dari sungai Bondo Kodi yang memiliki areal potensial seluas 3.000 Ha dan 729,09 ha untuk saluran sekunderKawango Hari. Musim tanam yang berlangsung adalah 3 musim tanam yakni padi-palawija-palawija.Tujuan dari penelitian ini untuk merencanakan jaringan irigasi agar kebutuhan air pada daerah irigasi Kodi Kabupaten Sumba Barat Daya dapat terpenuhi. Data atau informasi yang digunakan adalah data sekunder yang diperoleh dari Balai Wilayah Sungai Nusa Tenggara II yaitu data topografi, data curah hujan dan data klimatologi 10 tahun terakhir dari tahun 2008 sampai dengan tahun 2017 dan data primer diperoleh dari survey langsung di lapangan yaitu pengukuran situasi saluran irigasi, pengukuan debit sesaat, pengukuran dimensi saluran yang ada, pengkuran panjang saluran yang telah ada. Metode pengolahan data menggunakan perhitungan secara manual sesuai dengan metode Penman Modifikasi untuk menghitung evapotranspirasi, metode Dr. F. J. Mock untuk menghitung debit andalan, menghitung kebutuhan air irigasi (NFR) dan rumus strickler untuk debit saluran. Setelah dilakukan perhitungan maka didapat nilai evapotranspirasi Potensial Metode Penman Modifikasi sebesar 3,115 mm/hari, kebutuhan air irigasi(NFR) sebesar 1,39 ltr/dtk/ha, debit rencana saluran sebesar 1,5625 m3/dtk dan dimensi saluran untuk saluran sekunder ruas Kawango Hari adalah Lebar saluran (B) = 2,06 meter, Tinggi muka air (h) = 2,06 meter, tinggi jagaan (w) = 0,25 meter
Recombinant human G-CSF production as a protein based drug candidate for hematology and oncology
Authors: BOZKURT Yasemin , BİLGİN Sema , ERDEN Seçil , TURAN İsmail Furkan , GÖKÇE İsa
Published: November 2019

The human granulocyte colony stimulating factor (hG-CSF) is a member of the CSF family. The first purpose of this study was production of recombinant human G-CSF (rhG-CSF) which is an important therapeutic protein for angiogenesis based clinical applicaitons. rhG-CSF was produced as inclusion body in the Escherichia coli strain BL21 (DE3) pLysE with pTOLT vector system. The rhG-CSF was purified by Ni-NTA agarose afinity chromatography and characterized with SDS-PAGE analysis. The effects of this therapeutic protein on cell viability was measured by MTT assay. Additionally,  angiogenic potential of produced rhG-CSF was investigated via HUVEC cell line by in vitro scratch assay.  As a result, the purified protein induced cell proliferation and the EC50 value of protein based drug candidate was 0.051 mM. Additionally, it was determined that the migration ability of the HUVECs was promoted by rhG-CSF in a concentration-dependent manner by in vitro scratch assay.
德庆县雾的气候特征分析和预报方法研究
Authors: 赵 顺怡 , 吴 松杰 , 李 春贵
Published: November 2019

本研究利用1965～2003年德庆国家气象观测站地面大雾日数资料,用线性趋势、滑动平均等统计方法对德庆地区大雾日数的气候特征进行分析,利用NCEP/NCAR逐6小时1°×1°全球分析场资料,对德庆雾发生时的高低空天气形势进行分类,利用逐步回归和OSR方法建立各类型雾的预报方程。结果表明：德庆县雾日数总体呈上升趋势,雾日数在1970年出现突变；年平均雾日数24d；雾主要集中在10到12月和1月；雾主要在夜间和早晨出现；雾主要分为辐射雾、平流雾和锋面雾,天气形势大致可以分为大陆高压类、高压偏东类、均压场类、高压入海类、锋面类和低压前类；辐射雾发生时相对湿度较高,气温日较差较大,88%左右的辐射雾出现时气温日较差在7℃以上；雾多发生在风向为NW-NNE,成雾时风速在3m/s以下的占96.89%；对德庆县24小时能见度进行预报,辐射雾预报准确率较高,平流雾预报效果不理想,但总体而言,具有一定的准确性和客观性,辐射雾预报方程可应用于实际业务中。
试论如何加强我国环境空气质量监测体系建设
Authors: 孙 琦
Published: November 2019

目前我国环境空气污染已经非常严重,并且空气污染对人的身体健康带来巨大危险和安全隐患,因此必须通过加强环境空气质量监测,从而为环境保护提供参考依据。基于此,本文阐述了我国环境空气质量监测现状的分析,对我国环境空气质量监测体系建设进行了探讨分析,并论述了我国环境空气质量监测存在的问题及其措施。
论环境监测实验室质量控制重要意义及对策
Authors: 金 玥彤
Published: November 2019

所谓的实验室质量控制,即为确保研究所得结果误差处于允许范围内所采用的技术手段,不断提高研究结果的标准性与权威性。在环境监测技术应用中,实验室质量控制的意义十分重要。基于此,文章将环境监测实验室质量控制作为主要研究内容,重点阐述其意义与完善对策,希望有所帮助。
硅藻精土技术在加油站生活污水处理中的应用
Authors: 郝 静
Published: November 2019

硅藻精土污水处理技术是一项日渐成熟、广泛应用的污水处理技术。本文介绍了硅藻精土污水处理技术的技术原理,应用情况,着重介绍了使用该技术在13座加油站的生活污水处理应用效果。加油站使用硅藻精土污水处理技术一体化设备占地面积小、运行费用较低,能够有效净化加油站生活污水水质,使污水中的各项指标降低,实现出水达标,保证加油站景观绿化用水的需求,该技术可以考虑在加油站的普遍推广和应用。
河道整治存在的常见问题及解决方法
Authors: 尹 冬岩
Published: November 2019

本文简要介绍了自然河道面临的问题以及河道整治工程中存在的各类问题,进而提出了相应的河道治理策略,旨在加强河道整治,推动区域经济建设与生态文明建设的协同进步。
如何利用法律和经济手段强化环境监察职能
Authors: 孙 景春 , 刘 淑丽
Published: November 2019

在新形势背景下,单纯依靠行政命令已无法从根本上解决环境问题。对此,有必要运用法律手段和经济手段,严厉打击环境行政违法行为,以减轻生态环境污染,维系生态系统平衡,推动生态文明建设。本文就将围绕如何利用法律手段和经济手段强化环境监察职能展开系统探究。
Benign Mediastinal/Hiler Lenfadenopatilerde Etyoloji
Authors: ERBAY Müge , ÖZLÜ Tevfik , BÜLBÜL Yılmaz , ÖZTUNA Funda , ÖZSU Savaş , TEKİNBAŞ Celal
Published: November 2019

Çalışmamızda benign mediastinal/hiler lenfadenopati saptanan hastalar takip edilerek lenfadenopatiye neden olan hastalıkların dağılımı incelenmiştir. Çalışmamız, Mayıs 2015 ile Haziran 2016 tarihleri arasında prospektif olarak yürütüldü. Çalışmaya mediastinal/hiler lenfadenopati nedeni ile EBUS/ Mediastinoskopi/ Torakoskopi yapılan olgular alındı ve başlangıçta biyopside malignite saptanan hastalar çalışmadan çıkarıldı. Çalışmaya dahil edilen benign mediastinal/hiler LAP saptanan 93 hastanın %59.1 (55)’i kadın, %40.9 (38)’u erkek, yaş ortalaması 55.1 (±12.6) idi. Seksen üç hastaya Endobronşiyal Ultrason Eşliğinde Transbronşiyal İğne Aspirasyonu (EBUS TBİA), 7 hastaya mediastinoskopi, 2 hastaya Video-asiste torakoskopi (VATS) ve 1 hastaya torakotomi yapıldı. Hastaların son tanıları %53.8 (50) sarkoidoz, %12.9 (12) antrakoz, %5.1 (5) tüberküloz, %4.3 (4) silikozis, %1.1 (1) churg strauss sendromu, %1.1 (1) hipersensitivite pnömonisi, %1.1 (1) enfeksiyon, %1.1 (1) kanser, %19.4 (18) nedeni bilinmeyen olarak kabul edildi. Çalışmamızdaki esas bulgu benign mediastinal/hiler lenfadenopatinin en yaygın nedeninin sarkoidoz olarak bulunmasıdır. Enfeksiyöz nedenlerden tüberküloz ise 3. sıklıkta LAP nedeni olarak bulunmuştur. Ayrıca granülomatöz lenfadenitin benign mediastinal/hiler lenfadenopatilerin yarısından fazlasını oluşturduğu görülmüştür. Mediastinel/hiler LAP’lerin büyük oranda EBUS TBİA yöntemiyle örneklenebildiği saptanmıştır. Ayırıcı tanının yapılamadığı olgularda takip ile tanıya gidilebileceği de anlaşılmaktadır.
Obstructive Sleep Apnea Syndrome: An Overview
Authors: Krayem Ayman B. , Boudal Ayah M.
Published: November 2019

Obstructive sleep apnea is a common disorder, generally under-recognized and hence under diagnosed. It is associated with potentially serious morbidity and increasing mortality which can be prevented by early diagnosis, modification of risk factors and proper treatment. In this review, basic and updated information of obstructive sleep apnea of interest to internists and general physicians will be discussed. This includes important definitions, epidemiology, risk factors, diagnosis, pathophysiology, complications, mortality, and modalities of treatment.
Safety of a Pulmonary Embolism Ambulatory Treatment Program
Authors: Hamad Mahir M. , Ellidir Elrasheed A. , Routh Charlotte , Wali Siraj O. , Connolly Vincent M.
Published: November 2019

Objective: Evidence has emerged that out-patient management of pulmonary embolism may be an appropriate option in selected patients. This report is based on a safety data on a Pulmonary Embolism Ambulatory Treatment program.

Methods: An observational study in acute assessment unit from 2000-2006, of all consecutive patients with confirmed pulmonary embolism (high probability ventilation-perfusion scan or computerized tomography pulmonary angiography), have been evaluated. Exclusion criteria were oxygen saturation less than 92%; systolic blood pressure less than 100 mm Hg; significant cardiopulmonary or renal disease, and a bleeding risk. Patient treated initially with low molecular weight heparin followed by oral anticoagulants when diagnosis was confirmed and were assessed at 3 and 6 months.

Results: Sixty-one patients (33 females), median age 55 (range; 16-89 years) were eligible. Patients needed a maximum of 13 appointments. Risk factors included surgery (8.2%), cancer (8.2%), long travel (14.8%), previous thromboembolism (14.8%), hormonal replacement therapy (3.3%) and contraceptive pill (8.2%). No risk factor was identified at 37.7%. The mortality was zero at 6 months. No complications were recorded. Four patients required hospital admission, all within the first week; all were discharged within 24 hours. The median length of stay for patients with uncomplicated pulmonary embolism was 7 days; implementation of the pulmonary embolism ambulatory treatment program saved 427 bed days.

Conclusion: The pulmonary embolism ambulatory treatment program was cost-effective and was not associated with serious complications. Further evaluation of these programs could help establish the safety and cost-effectiveness of this approach.
Tuberculosis Related Sudden Death:
Authors: Althaqafi Abdulhakeem O. , Qubbany Atif W. , Saleh Asim K. , Abdelaziz Muntasir M.
Published: November 2019

Although tuberculosis-related to sudden death is recognize, complication of tuberculosis is rarely reported in the literature of the Middle East. A rare case of tuberculosis-related to sudden death was presented in a 28-year-old Saudi woman who was admitted to our hospital for pulmonary tuberculosis. Although anti-tuberculosis medication was started, she died suddenly; 7 days later, most probably due to a massive hemoptysis. The literature on tuberculosis-related to sudden death in relation to the current case have been reviewed and discussed in this report.
The Incidence and Clinical Outcome of Cardiac Tamponade Following an Open Heart Surgery in a Developing Country
Authors: Misbah Abdalla , Pothineni Koteswara R. , Elshiekh Eman , Yousif Ali Yassir H.
Published: November 2019

Introduction: Pericardial effusion is not uncommon following an open heart surgery, thus, it may progress to cardiac tamponade. This is a retrospective cross-sectional analysis evaluates the incidence, the potential perioperative and surgical risk factors causing cardiac tamponade following an open-heart surgery of patients during the period 2001-2006 at Ahmed Gasim Cardiac Center in Khartoum, North Sudan.

Methods: Diagnosis of cardiac tamponade was based on clinical and echocardiographic findings. Univariate analysis was performed to assess possible risk factors related to both, early and late cardiac tamponade.

Results: Among the 890 patients who underwent open heart surgery in this study, 47(5%) patients developed tamponade (early 49% or 51%). Early cardiac tamponade was found to be present with significant cardiac compromise and can easily be detected using echocardiography. In contrast the presentation of late cardiac tamponade, atypical and echocardiography was inconclusive. The mean age of patients was 31 ± 12 with slight female predominance. The main indication for the operation was rheumatic heart disease (89%), mainly mechanical valve replacement of the mitral valve. Eight (17%) patients were receiving warfarin preoperatively. Oozing wounds and blocked drains were encountered in 27% and 37%, respectively. About 6% of the patients recollect tamponade after decompression and one in-hospital death directly related to the cardiac tamponade.

Conclusion: Significant cardiac tamponade was associated with preexisting rheumatic heart disease, (preoperative warfarin use), mechanical valve replacement in the mitral position, oozing wounds and blocked drain. Echocardiography was reliable in early diagnosis, but not late, hemodynamically significant cardiac tamponade.
Different PEGylated Interferon Ribavirin Therapy in Non-Responders with Chronic Hepatitis C Virus Infection
Authors: Akbar Hisham O.
Published: November 2019

Background: PEGylated interferon and ribavirin therapy is the current standard of care for patients with chronic Hepatitis C virus. It is unknown whether retreatment may be beneficial in non-responders.

Methods: Patients who failed to respond to either PEG-Intron or Pegasys with ribavirin were switched to a different PEGylated interferon with ribavirin.

Patients were assessed for virologic response by a decrease in viral load levels using a polymerase chain reaction assay. Only patients who had a negative viral load at week 24 were allowed to continue treatment for 48 weeks. Patients with a negative polymerase chain reaction assay after 6 months off treatment were considered as responders to the retreatment regimen.

Results: A total of 16 patients were retreated. The combination of Pegasys and ribavirin was administered to 3 patients, and 13 patients received PEG-Intron with ribavirin. Patients had either genotype 1 or 4. Only 4 patients responded to retreatment with PEG-Intron (25%).

The responders were female, had a low viral load and had an early significant viral load reduction. Three patients had genotype 4, and one had genotype 1.

Conclusion: Retreatment with different PEGylated interferon in patients who failed previous treatment may have a role in the selected patients infected with chronic Hepatitis C virus.
Drug Related Problems at the Intensive Care Unit of a University Hospital in Saudi Arabia
Authors: Randhawa Mohammad A. , Qutub Hatem O. , Alghamdi Mastour S. , Al-Jaizani Raniah A. , Mushtaq Rayan Y. , Akbar Mohammad J.
Published: November 2019

Background: Medication errors can lead to mild or severe drug related problems. Drug related problems are sometimes unpredictable and can occur without medication errors. Awareness and identification of medication errors and drug related problems aids in adoption of measures to prevent and treat them.

Objective: Present study aimed to find out prevalence of drug related problems reporting or occurring at Intensive Care Unit of King Fahd Hospital of the University, Alkhobar, Saudi Arabia.

Methods: Scrutinizing written files of all patients reporting to Intensive Care Unit, from January to December 2012.

Results: Out of 193 files reviewed, 33 patients (17.1%) had trivial to serious drug related problems, including 8 (4.1%) deaths. Drugs commonly involved in these problems were anticoagulants (Warfarin and heparin, alone or in combination with aspirin or clopidogrel; 8 cases, 24.2%), antiepileptic drugs (Carbamazepine and phenytoin; 6 cases, 18.2%), immune suppressants (Azathioprine and prednisolone; 4 cases, 12.1%), antibiotics (Ciprofloxacin, imipenum, tazocin and vancomycin; 4 cases, 12.1%) and drugs of abuse and dependence (Alcohol, benzodiazepines, cannabis and opioids; 4 cases, 12.1%). Amongst drug related problems detected, 6 cases (18.2%) were linked to drug interactions. Almost 60% of drug related problems found were preventable, including those due to overdose toxicity, non-compliance and drug-drug interactions.

Conclusions: Mild to severe drug related problems occurred in intensive care unit of a university hospital and about half of them were preventable. It is hoped that the awareness and insight of drug related problems will help to improve patient care.
Lymph Node Abscess Caused by Nontyphoidal Salmonella in a Lymphoma Patient:
Authors: Alghamdi Amenah S. , AbuSanad Atlal M.
Published: November 2019

Nontyphoidal Salmonella species cause a wide spectrum of infections ranging from gastroenteritis and different focal infections to bacteremia. Nevertheless, out of all extraintestinal manifestations, lymphadenitis is rarely described in the literature, and no cases of associated lymph node abscess in lymphoma patients were described, to our knowledge, in the Middle East. Hence, we are reporting a case of cervical lymph node abscess caused by nontyphoidal Salmonella in a non-Hodgkin's lymphoma patient.
A Meta-Analysis Study: Vitamin D Deficiency in Saudi Arabia between 2009 and 2013
Authors: Bakarman Khalid A. , Bajubair Mohamad A.
Published: November 2019

Objective: Our aim was to review the prevalence of vitamin D deficiency in Kingdom of Saudi Arabia in different areas done by many researches.

Methods: By systematic review with meta-analysis we collected the research performed in different areas of Saudi Arabia over the period of 2009-2013. This included both published papers (peer-reviewed) and papers presented at documented scientific conferences.

Results: Fourteen papers were found, thirteen of which were peer-reviewed and published and one had been presented in a conference. They covered five main areas in KSA, and pooling the numbers yielded 6478 total healthy participants. 4694 (72%) were in the least healthy range with deficiency levels < 20 ng/ml, and a total of 5355 (82.7%) were at levels below recommendations (< 30 ng/ml). The central region in Riyadh and Qassim cities represented the most investigated area including 2755 participants with 6 articles; followed by the western region, at Jeddah and Makkah cities, with 2239 participants.

The eastern region (2 articles in Dammam and Al Khobar cities with 339 participants) showed the lowest frequency of vitamin D deficiency at 29.2%, followed by the central region at 74%.

Conclusions: Despite adequate sunlight and adequate intake of dairy products, vitamin D deficiency appears to be a major health problem in the Saudi community. There are some geographic areas in the country that may be at high risk. Control strategies should take these differences into account.
Awareness of Eighth Joint National Committee Guidelines in Hypertension Management among Internists in Al-Ahsaa Area
Authors: Al-Kattan Abdullah N.
Published: November 2019

Background: Hypertension is one of the most common conditions seen in primary care and the consequences are fatal if not diagnosed early and managed appropriately. Patients want to be sure that hypertension management will decrease their disease burden, and clinicians need guidance on hypertension treatment using the best scientific evidence. Objective: The primary objective is to evaluate the awareness of the Eighth Joint National Committee Guidelines among internists in the Al-Ahsaa area.

Method: This was a cross-sectional observational study that evaluated 43 internists randomly chosen in Al-Ahsaa area by using a questionnaire containing 16 questions that reflect on their awareness of the Eighth Joint National Committee Guidelines. Passing 80% of the 16 questions is described as fair awareness of the Eighth Joint National Committee Guidelines.

Results: The average of right answers percentages among the 43 evaluated internists was 54.07% ± 25.6%. The averages of right answers percentages among 16 physicians, 14 specialists and 13 consultants were 75.78% ± 20%, 47.76% ± 16% and 34.13% ± 20%, respectively, which showed a significant difference (P-value < 0.00001) between them.

Conclusion: The awareness of the Eighth Joint National Committee Guidelines among internists in Al-Ahsaa area is not good enough. However, physicians showed significantly better awareness of the Eighth Joint National Committee Guidelines than specialists and consultants. Increasing the awareness of internists about new guidelines for hypertension is highly recommended, through workshops that could be provided by the Ministry of Health.
Proposed Model of the Dividends Policy of REITs Listed at Kuwait Stock Exchange
Authors: Mohammed Shaalan Tharwah
Published: November 2019

The research aims to study the factors that affect the dividends policy at the REITs ,which listed at Kuwait Stock Exchange, using 41 observation of one year, included all 41 REITs, multi linear multi regression model technique was applied. The explanatory variables are, pay-out ratio, cash flow from finance activities, earning per share, assets size, revenues. The study reached to a statistically high significance and positive relationship between dividends per share and all explanatory variables except assets size had no significant effect, also revenue variable had negative relationship with dividends per share.
Фактори, що сприяють удосконаленню та розширенню правового статусу людини, особистості та громадянина в умовах глобалізації
Authors: Kofman B. Ya.
Published: November 2019

Правовий статус людини і громадянина як сукупність їхніх прав, свобод і обов’язків, що надані національною державою, є визначальною ознакою для розуміння відношення держави до людини. В умовах глобалізації, коли права людини стають об’єктом міжнародно-правової регламентації та регулювання, а їх виконання на території національної держави здійснюється через призму її міжнародно-правових зобов’язань, що передбачають можливість конвенційного контролю за виконанням таких зобов’язань, роль і значення правового статусу людини і громадянина суттєво зростає саме під впливом глобалізаційних процесів, що охоплюють міжнародне співтовариство, держави, їх народи та людей. Як наслідок, спостерігається трансформація та вдосконалення правового статусу людини і громадянина в бік його розширення.

Метою статті є дослідження факторів, що сприяють вдосконаленню та розширенню правового статусу людини, особистості та громадянина в умовах глобалізації.

Наукова новизна полягає у дослідженні та виокремленні факторів, що сприяють трансформації, вдосконаленню та розширенню правового статусу людини, особистості та громадянина в умовах глобалізації. За результатами дослідження виділено та проаналізовано 10 факторів.

Висновки. Трансформація, модернізація і розширення правового статусу людини і громадянина в умовах глобалізації відбувається завдяки складним соціальним (економічним, політичним, культурологічним, інформаційним, релігійним, екологічним) процесам вертикально-горизонтальної та міжгоризонтальної властивості, що супроводжують цей феномен, залучаючи до активної участі в них держави, народи та людей. З розвитком людства та державно організованого соціуму в умовах глобалізації потреби, інтереси, запити, життєві устремління людей піддаються суттєвому впливу з боку глобалізаційних процесів – вони, з одного боку, стають не тільки все більш різними, а й, з іншого боку, часом стосуються далеко не найбільш життєво важливих сфер людського життя, тобто таких, що загрожують фізичному існуванню людини або її благополуччю. Разом із тим слід відзначити, що ці потреби людей поступово все більше зсуваються у сферу духовну, де вирішуються питання самодосконалості людини, її фізичного та духовного зростання, що є вкрай важливим для сучасної людини. Правовий статус людини і громадянина, що встановлюється конкретною державою, не є статичною категорією, – він володіє високим динамічним потенціалом, завдяки чому активно реагує на глобалізаційні процеси, що скеровані на зміни гуманістичних і гуманітарних пріоритетів розвитку державності та міжнародної спільноти, шляхом його модернізації, вдосконалення і розширення.
Research Note: Stream water quality of a Community-Based Forest Management (CBFM)-protected watershed in Baybay, Leyte, Philippines
Authors: Pasa Arturo
Published: November 2019

The study assessed the quality of stream water of the watershed within the Community-Based Forest Management (CBFM) Project in Cienda, Gabas, Baybay, Leyte, Philippines. Results showed that, on the average, streamflow velocity was 0.30m/sec, streamflow volume 0.32m3/sec, turbidity 2.96 ntu and the associated sediments 16.0 mg/ L. Odor and taste were unobjectionable. pH ranged from 7.50 to 7.0 while total hardness from 7.84 to 15.16 mg/L. The average nitrite (NO2) content was 11.115mg/L while nitrate (NO3) was 1.05 mg/L. The concentration of nutrients was also very low. Phosphorous (P) ranged only from 2.20 to 4.46 mg/kg or parts per million (ppm) while potassium (K) ranged from 3.71 to 3.90 ppm. Sodium (Na), calcium (Ca), and magnesium (Mg) concentrations were also very low. Heavy metals were detected but also at low concentrations.
THE RELATIONSHIP BETWEEN SYNTACTIC AND SEMANTIC: A STUDY OF LINGUISTIC TYPOLOGY
Authors: Soares Antonio
Published: November 2019

This research entitled “The Relationship between Syntactic and Semantic : A Study of Linguistic Typology.” is intended to give a clear descriptions related to the relationship between syntactic and semantic on some languages. This research was focused on some clause structures typologycally either syntactically or semantically. The scope of this research was more focused on the transitive verbs to have more descriptions related to the relationship between syntactic and semantic to find out whether a clause structure on syntactic can be accepted or cannot be accepted semantically. The theory of linguistics typology was applied in this research because the principle of linguistics typpology is to find out the similarities and the differences among all the type of languages universally. The introspective reflexive and the descriptive method were applied to gain the data in this research and the qualitative descriptive method was applied to analyse the data.
Modular Genetic Architecture of the Toxigenic Plasmid pIS56-63 Harboring cry1Ab21 in Bacillus thuringiensis subsp. thuringiensis strain IS5056
Authors: MURAWSKA EMILIA , FIEDORUK KRZYSZTOF , SWIECICKA IZABELA
Published: November 2019

Bacillus thuringiensis subsp. thuringiensis IS5056, a strain highly toxic to Trichoplusia ni larvae, produces the newly described Cry1Ab21 delta-endotoxin encoded by a gene located in the 63.8 kb pIS56-63 plasmid. In this report we present the structure and functional similarity of this plasmid to other B. thuringiensis large toxigenic plasmids with particular interest focused on its modular architecture. The 61 open reading frames (ORFs) of the plasmid made four functional modules: (i) M1-mic, the mobile insertion cassette harboring cry1Ab21; (ii) M2-tra, the putative conjugative element; (iii) M3-reg, regulation sequence; and (iv) M4-rep, the ori44 replicon. These modules display similarity to corresponding sequences in distinct B. thuringiensis plasmids, but, in general, not to plasmid of other Bacillus cereus sensu lato. The nucleotide sequence and organization of genes in pIS56-63 were highly similar (80-100%) to those in pHT73 of B. thuringiensis HT73, and in p03 of B. thuringiensis HD771, particularly within the M3-reg and M4-rep modules, and slightly less in M2-tra, the latter of which is composed of two segments exhibiting homology to sequences in pBMB28, pAH187_45, pCT83, and pIS56-85 or to pCT72, pBMB67, p04, and pIS56-68. The tetrapartite structure of the toxigenic pIS56-63 plasmid strongly suggests that its hybrid nature is a result of recombination of various genetic elements originating from different extrachromosomal and chromosomal sources in B. thuringiensis. The presence of cry1Ab21 in the mobile cassette suggests that its occurrence on pIS56-63 resulted from recombination and transposition events during the evolution of the plasmid.
传统村落整体保护的实践探索
Authors: 肖 泳 , 周 小敏 , 姚 艾嘉
Published: November 2019

传统村落是我国农耕文明演替的重要载体，需要予以重点保护。现有学术研究和保护实践中，往往倾向于按照从规划到实施的不同环节切割，分段推进，容易造成保护实施工作不利的局面。重庆武隆区犀牛寨的保护实践过程中，尝试实现了自规划—设计—建设实施—运营—维护等环节的整合，实现了保护工作的整体实施推进。自规划初始到后期实施、运营维护，设计团队与地方政府联合，按照“古貌复原、因地制宜、一户一设计、一户一实施”的原则，推进了犀牛寨传统村落的保护实践，取得了较好的建设实效。犀牛寨的实践，尝试整将学术研究和具体实践对整个流程环节的切合实施，具有重要研究和实践意义。
浅析城市生活垃圾填埋场渗滤液处理工艺
Authors: 肖 珊 , 王 慧 , 左 芳萍
Published: November 2019

城市生活垃圾以填埋为主，受各种因素的影响，垃圾填埋场渗滤液的污染问题尤为突出。文章首先分析了城市生活垃圾渗滤液的来源和特点，研究认为，渗滤液主要来源于大气降水、地下水、地表水、游离水和垃圾的化学分解；然后，就渗滤液的处理工艺从物理处理、化学处理和生物处理三个方面进行了详细阐述；文章认为，在选择渗滤液处理工艺时应具有针对性，因地制宜，采用最为合理的组合处理工艺。
夏热冬冷地区外墙外保温系统应用适宜性分析
Authors: 于 东洋
Published: November 2019

文章以北方夏热冬冷地区建筑节能工程实践为例，对岩棉板外墙外保温系统和聚合聚苯板外墙外保温系统进行对比分析，从体系的性能指标、成本、安全性、环保消防和适用范围等几个方面对两个系统进行了全面的综合比较分析，提出了相关参考意见，希望能达到让用户及研究设计人员优化设计、合理选用外墙外保温系统的目的。
预应力混凝土桥梁设计与施工新工艺探析
Authors: 孙 洪臣
Published: November 2019

在我国漫长的历史进程中，大量的先进的文明技术深深地影响了世界发展，其中桥梁工程是重要的一个内容。中国古代的木桥，石桥建造技术在很长一段时间以来一直都保持着世界先进的水平，并得到了世界桥梁专家的广泛认可。当前，用预应力混凝土技术建造的桥梁已经经过了半个世纪的发展，近年来相关技术更是迅速的革新。预应力混凝土施工工艺在建筑工程项目中得到了普遍的应用，特别是在桥梁工程项目的建造中。在桥梁工程的设计，施工建造工艺，相关理论研究，建筑施工材料，机械设备等等预应力技术都得到了很大的发展。当前我国的预应力混凝土桥梁工程的设计工艺和建造工艺都已经达到了世界领先的水平。应用这些新的设计建造技术不仅可以有效的改善了混凝土结构的质量和安全，提升工程项目建造的经济效益同时还可以提高工程项目使用年限。
装配式建筑现浇结构与预制构件的连接处理
Authors: 冯 伟荣
Published: November 2019

预制装配式现浇结构建筑具有结构复杂、功能性强的特质，其预制构件与现浇结构连接节点的优化设计对于强化建筑结构整体性、提高建筑质量与使用寿命具有重要影响。文章介绍了装配式建筑现浇结构类型与预制构件安装技术要点，以某高层住宅预制装配式现浇剪力墙工程为研究实例，围绕剪力墙叠合板连接节点处理、梁端连接节点设计、墙板连接节点设计、分布钢筋连接技术四个层面，探讨了装配式建筑现浇结构与预制构件的具体连接处理方法，以供参考。
煤矿矿井井筒穿越采空区的治理方法
Authors: 王 振
Published: November 2019

在煤矿矿井井筒建设过程中，遭遇采空区是不可避免的事情。采空区可能导致围岩强度降低，并对井筒建设产生不利影响。针对某矿井井筒工程及井筒附近的煤层采空区，首先对该工程做出简单介绍，之后阐明采空区对井筒建设影响的类型和机理，最后讨论了当井筒穿越采空区时对采空区的处理原则和具体方法。
浅析测绘工程在山洪灾害防控及治理中的应用
Authors: 张 志生
Published: November 2019

我国地域辽阔，很多的地区的地质情况和环境情况都是存在较大的差别的，经过对大量的信息数据进行分析我们发现，我国山洪灾害发展频率最高的地区主要集中在降雨量较大的汛期的山地丘陵地带，并且往往会伴有洪水，泥石流等各种自然灾害，这样就会导致地区经济损失，并且会对民众的人身安全造成一定的威胁。特别是处在我国东部地区的一些沿海城市，每年都会发生不同程度的洪水灾害，对我国社会的和谐稳定发展造成了一定的不良影响，鉴于此，这篇文章主要围绕测绘工程在山洪灾害预防以及治理方面的作用展开全面的分析研究，希望能够对山洪灾害的防控及治理工作质量的提升有所助益。
地铁通信的无线系统覆盖和网络优化
Authors: 乔 文海
Published: November 2019

移动终端的发展使得人们对网络的需求呈现出跨越式的发展，能否建立良好的无线系统覆盖和网络，将会在很大程度上会对人们生活质量产生影响。人们已经离不开网络，不论是在何时何地，人们都希望得到优质的网络服务。城市居民的出行主要借助于地铁进行，而在这个过程中，由于无线系统和网络建设方面的缺失，人们往往会受到网络方面的困扰。因此，必须对地铁通信的无线系统和网络方面进行优化。
航空项目的风险识别技术探究
Authors: 刘 冬丽
Published: November 2019

文章以航空项目为研究对象，对其风险识别技术进行分析的同时，说明相关风险管理的策略化模型体系。通过对航空项目的综合介绍，尝试定位风险问题的来源条件，并在其风险识别技术内容上，对风险表、鱼骨图的应用进行分析，以此形成完整的“现象-因子”模型，保证风险识别与管理的有效性。